/mandos/release : revision 237.7.207

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

41

42

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

43

stdout, ferror(), remove() */

44

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

44

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

45

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

46

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

47

strtof(), abort() */

61

*/

62

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

63

strtoimax() */

64

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

65

64

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

66

65

program_invocation_short_name */

67

66

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

73

72

*/

74

73

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

75

74

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

76

setgid(), pause() */

75

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

77

76

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

78

77

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

79

78

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

87

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

87

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

89

88

WEXITSTATUS(), WTERMSIG() */

89

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

90

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

91

argz_delete(), argz_append(),

92

argz_stringify(), argz_add(),

93

argz_count() */

90

94

91

95

#ifdef __linux__

92

96

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

110

114

init_gnutls_session(),

111

115

GNUTLS_* */

112

116

#include <gnutls/openpgp.h>

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

117

/* gnutls_certificate_set_openpgp_key_file(),

118

GNUTLS_OPENPGP_FMT_BASE64 */

115

119

116

120

/* GPGME */

117

121

#include <gpgme.h> /* All GPGME types, constants and

134

138

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

135

139

char *connect_to = NULL;

136

140

const char *hookdir = HOOKDIR;

141

uid_t uid = 65534;

142

gid_t gid = 65534;

137

143

138

144

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

139

145

typedef struct server{

140

146

const char *ip;

141

uint16_t port;

147

in_port_t port;

142

148

AvahiIfIndex if_index;

143

149

int af;

144

150

struct timespec last_seen;

148

154

149

155

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

150

156

typedef struct {

151

AvahiSimplePoll *simple_poll;

152

157

AvahiServer *server;

153

158

gnutls_certificate_credentials_t cred;

154

159

unsigned int dh_bits;

156

161

const char *priority;

157

162

gpgme_ctx_t ctx;

158

163

server *current_server;

164

char *interfaces;

165

size_t interfaces_size;

159

166

} mandos_context;

160

167

161

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

162

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

163

.dh_bits = 1024, .priority = "SECURE256"

164

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

165

.current_server = NULL };

168

/* global so signal handler can reach it*/

169

AvahiSimplePoll *simple_poll;

166

170

167

171

sig_atomic_t quit_now = 0;

168

172

int signal_received = 0;

169

173

170

174

/* Function to use when printing errors */

171

175

void perror_plus(const char *print_text){

176

int e = errno;

172

177

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

173

178

program_invocation_short_name);

179

errno = e;

174

180

perror(print_text);

175

181

}

176

182

183

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

184

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

185

va_list ap;

186

va_start (ap, format);

187

188

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

189

program_invocation_short_name));

190

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

191

}

192

177

193

/*

178

194

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

179

195

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

180

196

* "buffer_length" is how much is already used.

181

197

*/

182

198

size_t incbuffer(char **buffer, size_t buffer_length,

183

size_t buffer_capacity){

199

size_t buffer_capacity){

184

200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

185

201

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

186

202

if(buffer == NULL){

192

208

}

193

209

194

210

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

195

int add_server(const char *ip, uint16_t port,

196

AvahiIfIndex if_index,

197

int af){

211

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

212

int af, server **current_server){

198

213

int ret;

199

214

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

200

215

if(new_server == NULL){

201

216

perror_plus("malloc");

202

return -1;

217

return false;

203

218

}

204

219

*new_server = (server){ .ip = strdup(ip),

205

.port = port,

206

.if_index = if_index,

207

.af = af };

220

.port = port,

221

.if_index = if_index,

222

.af = af };

208

223

if(new_server->ip == NULL){

209

224

perror_plus("strdup");

210

return -1;

225

return false;

211

226

}

212

227

/* Special case of first server */

213

if (mc.current_server == NULL){

228

if(*current_server == NULL){

214

229

new_server->next = new_server;

215

230

new_server->prev = new_server;

216

mc.current_server = new_server;

231

*current_server = new_server;

217

232

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

218

233

} else {

219

new_server->next = mc.current_server;

220

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

234

new_server->next = *current_server;

235

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

221

236

new_server->prev->next = new_server;

222

mc.current_server->prev = new_server;

237

(*current_server)->prev = new_server;

223

238

}

224

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

239

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

225

240

if(ret == -1){

226

241

perror_plus("clock_gettime");

227

return -1;

242

return false;

228

243

}

229

return 0;

244

return true;

230

245

}

231

246

232

247

/*

233

248

* Initialize GPGME.

234

249

*/

235

static bool init_gpgme(const char *seckey,

236

const char *pubkey, const char *tempdir){

250

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

251

const char *tempdir, mandos_context *mc){

237

252

gpgme_error_t rc;

238

253

gpgme_engine_info_t engine_info;

239

254

240

241

255

/*

242

256

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

243

257

*/

254

268

255

269

rc = gpgme_data_new_from_fd(&pgp_data, fd);

256

270

if(rc != GPG_ERR_NO_ERROR){

257

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

258

"bad gpgme_data_new_from_fd: %s: %s\n",

259

gpgme_strsource(rc), gpgme_strerror(rc));

271

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

272

gpgme_strsource(rc), gpgme_strerror(rc));

260

273

return false;

261

274

}

262

275

263

rc = gpgme_op_import(mc.ctx, pgp_data);

276

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

264

277

if(rc != GPG_ERR_NO_ERROR){

265

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

266

"bad gpgme_op_import: %s: %s\n",

267

gpgme_strsource(rc), gpgme_strerror(rc));

278

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

279

gpgme_strsource(rc), gpgme_strerror(rc));

268

280

return false;

269

281

}

270

282

277

289

}

278

290

279

291

if(debug){

280

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

281

"Initializing GPGME\n");

292

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

282

293

}

283

294

284

295

/* Init GPGME */

285

296

gpgme_check_version(NULL);

286

297

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

287

298

if(rc != GPG_ERR_NO_ERROR){

288

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

289

"bad gpgme_engine_check_version: %s: %s\n",

290

gpgme_strsource(rc), gpgme_strerror(rc));

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

291

301

return false;

292

302

}

293

303

294

304

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

295

305

rc = gpgme_get_engine_info(&engine_info);

296

306

if(rc != GPG_ERR_NO_ERROR){

297

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

298

"bad gpgme_get_engine_info: %s: %s\n",

299

gpgme_strsource(rc), gpgme_strerror(rc));

307

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

308

gpgme_strsource(rc), gpgme_strerror(rc));

300

309

return false;

301

310

}

302

311

while(engine_info != NULL){

308

317

engine_info = engine_info->next;

309

318

}

310

319

if(engine_info == NULL){

311

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

312

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

320

fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",

321

tempdir);

313

322

return false;

314

323

}

315

324

316

325

/* Create new GPGME "context" */

317

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

326

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

318

327

if(rc != GPG_ERR_NO_ERROR){

319

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

320

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

321

gpgme_strerror(rc));

328

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

329

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

330

gpgme_strerror(rc));

322

331

return false;

323

332

}

324

333

335

344

*/

336

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

337

346

size_t crypto_size,

338

char **plaintext){

347

char **plaintext,

348

mandos_context *mc){

339

349

gpgme_data_t dh_crypto, dh_plain;

340

350

gpgme_error_t rc;

341

351

ssize_t ret;

343

353

ssize_t plaintext_length = 0;

344

354

345

355

if(debug){

346

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

347

"Trying to decrypt OpenPGP data\n");

356

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

348

357

}

349

358

350

359

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

351

360

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

352

361

0);

353

362

if(rc != GPG_ERR_NO_ERROR){

354

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

355

"bad gpgme_data_new_from_mem: %s: %s\n",

356

gpgme_strsource(rc), gpgme_strerror(rc));

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

357

365

return -1;

358

366

}

359

367

360

368

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

361

369

rc = gpgme_data_new(&dh_plain);

362

370

if(rc != GPG_ERR_NO_ERROR){

363

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

364

"bad gpgme_data_new: %s: %s\n",

365

gpgme_strsource(rc), gpgme_strerror(rc));

371

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

372

"bad gpgme_data_new: %s: %s\n",

373

gpgme_strsource(rc), gpgme_strerror(rc));

366

374

gpgme_data_release(dh_crypto);

367

375

return -1;

368

376

}

369

377

370

378

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

371

379

data buffer */

372

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

380

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

373

381

if(rc != GPG_ERR_NO_ERROR){

374

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

375

"bad gpgme_op_decrypt: %s: %s\n",

376

gpgme_strsource(rc), gpgme_strerror(rc));

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

377

384

plaintext_length = -1;

378

385

if(debug){

379

386

gpgme_decrypt_result_t result;

380

result = gpgme_op_decrypt_result(mc.ctx);

387

result = gpgme_op_decrypt_result(mc->ctx);

381

388

if(result == NULL){

382

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

383

"gpgme_op_decrypt_result failed\n");

389

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

384

390

} else {

385

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

386

"Unsupported algorithm: %s\n",

387

result->unsupported_algorithm);

388

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

389

"Wrong key usage: %u\n",

390

result->wrong_key_usage);

391

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

392

result->unsupported_algorithm);

393

fprintf_plus(stderr, "Wrong key usage: %u\n",

394

result->wrong_key_usage);

391

395

if(result->file_name != NULL){

392

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

393

"File name: %s\n", result->file_name);

396

fprintf_plus(stderr, "File name: %s\n", result->file_name);

394

397

}

395

398

gpgme_recipient_t recipient;

396

399

recipient = result->recipients;

397

400

while(recipient != NULL){

398

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

399

"Public key algorithm: %s\n",

400

gpgme_pubkey_algo_name(recipient->pubkey_algo));

401

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

402

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

403

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

404

"Secret key available: %s\n",

405

recipient->status == GPG_ERR_NO_SECKEY

406

? "No" : "Yes");

401

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

402

gpgme_pubkey_algo_name

403

(recipient->pubkey_algo));

404

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

405

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

406

recipient->status == GPG_ERR_NO_SECKEY

407

? "No" : "Yes");

407

408

recipient = recipient->next;

408

409

}

409

410

}

412

413

}

413

414

415

if(debug){

415

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

416

"Decryption of OpenPGP data succeeded\n");

416

fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");

417

}

418

419

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

426

*plaintext = NULL;

427

while(true){

428

plaintext_capacity = incbuffer(plaintext,

429

(size_t)plaintext_length,

430

plaintext_capacity);

429

(size_t)plaintext_length,

430

plaintext_capacity);

431

if(plaintext_capacity == 0){

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

435

}

436

437

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

450

}

451

452

if(debug){

453

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

454

"Decrypted password is: ");

453

fprintf_plus(stderr, "Decrypted password is: ");

455

454

for(ssize_t i = 0; i < plaintext_length; i++){

456

455

fprintf(stderr, "%02hhX ", (*plaintext)[i]);

457

456

}

469

468

}

470

469

471

470

static const char * safer_gnutls_strerror(int value){

472

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

473

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

474

472

if(ret == NULL)

475

473

ret = "(unknown)";

476

474

return ret;

479

477

/* GnuTLS log function callback */

480

478

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

481

479

const char* string){

482

fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);

480

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

483

481

}

484

482

485

483

static int init_gnutls_global(const char *pubkeyfilename,

486

const char *seckeyfilename){

484

const char *seckeyfilename,

485

mandos_context *mc){

487

486

int ret;

488

487

489

488

if(debug){

490

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

491

"Initializing GnuTLS\n");

489

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

492

490

}

493

491

494

492

ret = gnutls_global_init();

495

493

if(ret != GNUTLS_E_SUCCESS){

496

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

497

"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));

494

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

495

safer_gnutls_strerror(ret));

498

496

return -1;

499

497

}

500

498

507

505

}

508

506

509

507

/* OpenPGP credentials */

510

ret = gnutls_certificate_allocate_credentials(&mc.cred);

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

511

509

if(ret != GNUTLS_E_SUCCESS){

512

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

513

"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));

510

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

511

safer_gnutls_strerror(ret));

514

512

gnutls_global_deinit();

515

513

return -1;

516

514

}

517

515

518

516

if(debug){

519

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

520

"Attempting to use OpenPGP public key %s and"

521

" secret key %s as GnuTLS credentials\n", pubkeyfilename,

522

seckeyfilename);

517

fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"

518

" secret key %s as GnuTLS credentials\n",

519

pubkeyfilename,

520

seckeyfilename);

523

521

}

524

522

525

523

ret = gnutls_certificate_set_openpgp_key_file

526

(mc.cred, pubkeyfilename, seckeyfilename,

524

(mc->cred, pubkeyfilename, seckeyfilename,

527

525

GNUTLS_OPENPGP_FMT_BASE64);

528

526

if(ret != GNUTLS_E_SUCCESS){

529

fprintf(stderr,

530

"Mandos plugin mandos-client: "

531

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

532

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

533

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

534

"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));

527

fprintf_plus(stderr,

528

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

529

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

530

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

531

safer_gnutls_strerror(ret));

535

532

goto globalfail;

536

533

}

537

534

538

535

/* GnuTLS server initialization */

539

ret = gnutls_dh_params_init(&mc.dh_params);

536

ret = gnutls_dh_params_init(&mc->dh_params);

540

537

if(ret != GNUTLS_E_SUCCESS){

541

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

542

"Error in GnuTLS DH parameter initialization:"

543

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

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

" initialization: %s\n",

540

safer_gnutls_strerror(ret));

544

541

goto globalfail;

545

542

}

546

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

543

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

547

544

if(ret != GNUTLS_E_SUCCESS){

548

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

549

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

550

safer_gnutls_strerror(ret));

545

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

546

safer_gnutls_strerror(ret));

551

547

goto globalfail;

552

548

}

553

549

554

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

550

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

555

551

556

552

return 0;

557

553

558

554

globalfail:

559

555

560

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_certificate_free_credentials(mc->cred);

561

557

gnutls_global_deinit();

562

gnutls_dh_params_deinit(mc.dh_params);

558

gnutls_dh_params_deinit(mc->dh_params);

563

559

return -1;

564

560

}

565

561

566

static int init_gnutls_session(gnutls_session_t *session){

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

567

564

int ret;

568

565

/* GnuTLS session creation */

569

566

do {

573

570

}

574

571

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

575

572

if(ret != GNUTLS_E_SUCCESS){

576

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

577

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

578

safer_gnutls_strerror(ret));

573

fprintf_plus(stderr,

574

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

575

safer_gnutls_strerror(ret));

579

576

}

580

577

581

578

{

582

579

const char *err;

583

580

do {

584

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

581

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

585

582

if(quit_now){

586

583

gnutls_deinit(*session);

587

584

return -1;

588

585

}

589

586

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

590

587

if(ret != GNUTLS_E_SUCCESS){

591

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

592

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

593

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

594

"GnuTLS error: %s\n", safer_gnutls_strerror(ret));

588

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

589

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

590

safer_gnutls_strerror(ret));

595

591

gnutls_deinit(*session);

596

592

return -1;

597

593

}

599

595

600

596

do {

601

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

602

mc.cred);

598

mc->cred);

603

599

if(quit_now){

604

600

gnutls_deinit(*session);

605

601

return -1;

606

602

}

607

603

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

608

604

if(ret != GNUTLS_E_SUCCESS){

609

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

610

"Error setting GnuTLS credentials: %s\n",

611

safer_gnutls_strerror(ret));

605

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

606

safer_gnutls_strerror(ret));

612

607

gnutls_deinit(*session);

613

608

return -1;

614

609

}

616

611

/* ignore client certificate if any. */

617

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

618

613

619

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

620

615

621

616

return 0;

622

617

}

626

621

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

627

622

628

623

/* Called when a Mandos server is found */

629

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

624

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

630

625

AvahiIfIndex if_index,

631

int af){

626

int af, mandos_context *mc){

632

627

int ret, tcp_sd = -1;

633

628

ssize_t sret;

634

629

union {

659

654

pf = PF_INET;

660

655

break;

661

656

default:

662

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

663

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

657

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

664

658

errno = EINVAL;

665

659

return -1;

666

660

}

667

661

668

ret = init_gnutls_session(&session);

662

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

663

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

664

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

665

bool match = false;

666

{

667

char *interface = NULL;

668

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

669

interface))){

670

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

671

match = true;

672

break;

673

}

674

}

675

}

676

if(not match){

677

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

678

connect to the server */

679

if(debug){

680

char interface[IF_NAMESIZE];

681

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

682

perror_plus("if_indextoname");

683

} else {

684

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

685

" \"%s\"\n",

686

if_indextoname((unsigned int)if_index,

687

interface));

688

}

689

}

690

return -1;

691

}

692

}

693

694

ret = init_gnutls_session(&session, mc);

669

695

if(ret != 0){

670

696

return -1;

671

697

}

672

698

673

699

if(debug){

674

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

675

"Setting up a TCP connection to %s, port %" PRIu16

676

"\n", ip, port);

700

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

701

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

677

702

}

678

703

679

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

705

730

}

706

731

if(ret == 0){

707

732

int e = errno;

708

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

709

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

733

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

710

734

errno = e;

711

735

goto mandos_end;

712

736

}

713

737

if(af == AF_INET6){

714

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

715

-Wconversion and

716

-Wunreachable-code */

717

738

to.in6.sin6_port = htons(port);

739

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

718

743

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

719

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

720

-Wunreachable-code*/

744

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

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

721

748

if(if_index == AVAHI_IF_UNSPEC){

722

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

723

"An IPv6 link-local address is incomplete"

724

" without a network interface\n");

749

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

750

" incomplete without a network interface\n");

725

751

errno = EINVAL;

726

752

goto mandos_end;

727

753

}

729

755

to.in6.sin6_scope_id = (uint32_t)if_index;

730

756

}

731

757

} else {

732

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

733

-Wconversion and

734

-Wunreachable-code */

758

to.in.sin_port = htons(port);

735

759

}

736

760

737

761

if(quit_now){

745

769

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

746

770

perror_plus("if_indextoname");

747

771

} else {

748

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

749

"Connection to: %s%%%s, port %" PRIu16 "\n",

750

ip, interface, port);

772

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

773

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

751

774

}

752

775

} else {

753

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

754

"Connection to: %s, port %" PRIu16 "\n", ip, port);

776

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

777

ip, (uintmax_t)port);

755

778

}

756

779

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

757

780

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

767

790

perror_plus("inet_ntop");

768

791

} else {

769

792

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

770

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

771

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

793

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

772

794

}

773

795

}

774

796

}

802

824

while(true){

803

825

size_t out_size = strlen(out);

804

826

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

805

out_size - written));

827

out_size - written));

806

828

if(ret == -1){

807

829

int e = errno;

808

830

perror_plus("write");

828

850

}

829

851

830

852

if(debug){

831

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

832

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

853

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

833

854

}

834

855

835

856

if(quit_now){

837

858

goto mandos_end;

838

859

}

839

860

840

/* Spurious warning from -Wint-to-pointer-cast */

841

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

861

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

862

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

863

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

864

gnutls_transport_set_ptr(session,

865

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

842

866

843

867

if(quit_now){

844

868

errno = EINTR;

855

879

856

880

if(ret != GNUTLS_E_SUCCESS){

857

881

if(debug){

858

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

859

"*** GnuTLS Handshake failed ***\n");

882

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

860

883

gnutls_perror(ret);

861

884

}

862

885

errno = EPROTO;

866

889

/* Read OpenPGP packet that contains the wanted password */

867

890

868

891

if(debug){

869

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

870

"Retrieving OpenPGP encrypted password from %s\n", ip);

892

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

893

" %s\n", ip);

871

894

}

872

895

873

896

while(true){

878

901

}

879

902

880

903

buffer_capacity = incbuffer(&buffer, buffer_length,

881

buffer_capacity);

904

buffer_capacity);

882

905

if(buffer_capacity == 0){

883

906

int e = errno;

884

907

perror_plus("incbuffer");

911

934

}

912

935

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

913

936

if(ret < 0){

914

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

915

"*** GnuTLS Re-handshake failed ***\n");

937

fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "

938

"***\n");

916

939

gnutls_perror(ret);

917

940

errno = EPROTO;

918

941

goto mandos_end;

919

942

}

920

943

break;

921

944

default:

922

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

923

"Unknown error while reading data from"

924

" encrypted session with Mandos server\n");

945

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

946

" encrypted session with Mandos server\n");

925

947

gnutls_bye(session, GNUTLS_SHUT_RDWR);

926

948

errno = EIO;

927

949

goto mandos_end;

932

954

}

933

955

934

956

if(debug){

935

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

936

"Closing TLS session\n");

957

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

937

958

}

938

959

939

960

if(quit_now){

951

972

952

973

if(buffer_length > 0){

953

974

ssize_t decrypted_buffer_size;

954

decrypted_buffer_size = pgp_packet_decrypt(buffer,

955

buffer_length,

956

&decrypted_buffer);

975

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

976

&decrypted_buffer, mc);

957

977

if(decrypted_buffer_size >= 0){

958

978

959

979

written = 0;

969

989

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

970

990

int e = errno;

971

991

if(debug){

972

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

973

"Error writing encrypted data: %s\n",

974

strerror(errno));

992

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

993

strerror(errno));

975

994

}

976

995

errno = e;

977

996

goto mandos_end;

1021

1040

AVAHI_GCC_UNUSED AvahiStringList *txt,

1022

1041

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1023

1042

flags,

1024

AVAHI_GCC_UNUSED void* userdata){

1025

assert(r);

1043

void* mc){

1044

if(r == NULL){

1045

return;

1046

}

1026

1047

1027

1048

/* Called whenever a service has been resolved successfully or

1028

1049

timed out */

1034

1055

switch(event){

1035

1056

default:

1036

1057

case AVAHI_RESOLVER_FAILURE:

1037

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

1038

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

1039

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

1040

avahi_strerror(avahi_server_errno(mc.server)));

1058

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

1059

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

1060

domain,

1061

avahi_strerror(avahi_server_errno

1062

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

1041

1063

break;

1042

1064

1043

1065

case AVAHI_RESOLVER_FOUND:

1045

1067

char ip[AVAHI_ADDRESS_STR_MAX];

1046

1068

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

1047

1069

if(debug){

1048

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

1049

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

1050

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

1051

ip, (intmax_t)interface, port);

1070

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

1071

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

1072

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

1052

1073

}

1053

int ret = start_mandos_communication(ip, port, interface,

1054

avahi_proto_to_af(proto));

1074

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

1075

interface,

1076

avahi_proto_to_af(proto),

1077

mc);

1055

1078

if(ret == 0){

1056

avahi_simple_poll_quit(mc.simple_poll);

1079

avahi_simple_poll_quit(simple_poll);

1057

1080

} else {

1058

ret = add_server(ip, port, interface,

1059

avahi_proto_to_af(proto));

1081

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

1082

avahi_proto_to_af(proto),

1083

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

1084

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

1085

" list\n", name);

1086

}

1060

1087

}

1061

1088

}

1062

1089

}

1072

1099

const char *domain,

1073

1100

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1074

1101

flags,

1075

AVAHI_GCC_UNUSED void* userdata){

1076

assert(b);

1102

void* mc){

1103

if(b == NULL){

1104

return;

1105

}

1077

1106

1078

1107

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

1079

1108

is removed from the LAN */

1086

1115

default:

1087

1116

case AVAHI_BROWSER_FAILURE:

1088

1117

1089

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

1090

"(Avahi browser) %s\n",

1091

avahi_strerror(avahi_server_errno(mc.server)));

1092

avahi_simple_poll_quit(mc.simple_poll);

1118

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

1119

avahi_strerror(avahi_server_errno

1120

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

1121

avahi_simple_poll_quit(simple_poll);

1093

1122

return;

1094

1123

1095

1124

case AVAHI_BROWSER_NEW:

1098

1127

the callback function is called the Avahi server will free the

1099

1128

resolver for us. */

1100

1129

1101

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

1102

name, type, domain, protocol, 0,

1103

resolve_callback, NULL) == NULL)

1104

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

1105

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

1106

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

1130

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

1131

interface, protocol, name, type,

1132

domain, protocol, 0,

1133

resolve_callback, mc) == NULL)

1134

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

1135

" %s\n", name,

1136

avahi_strerror(avahi_server_errno

1137

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

1107

1138

break;

1108

1139

1109

1140

case AVAHI_BROWSER_REMOVE:

1112

1143

case AVAHI_BROWSER_ALL_FOR_NOW:

1113

1144

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1114

1145

if(debug){

1115

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

1116

"No Mandos server found, still searching...\n");

1146

fprintf_plus(stderr, "No Mandos server found, still"

1147

" searching...\n");

1117

1148

}

1118

1149

break;

1119

1150

}

1128

1159

signal_received = sig;

1129

1160

int old_errno = errno;

1130

1161

/* set main loop to exit */

1131

if(mc.simple_poll != NULL){

1132

avahi_simple_poll_quit(mc.simple_poll);

1162

if(simple_poll != NULL){

1163

avahi_simple_poll_quit(simple_poll);

1133

1164

}

1134

1165

errno = old_errno;

1135

1166

}

1136

1167

1137

1168

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

1138

1169

int ret;

1170

error_t ret_errno;

1139

1171

1140

1172

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

1141

1173

if(s < 0){

1174

ret_errno = errno;

1142

1175

perror_plus("socket");

1176

errno = ret_errno;

1143

1177

return false;

1144

1178

}

1145

1179

strcpy(ifr->ifr_name, ifname);

1146

1180

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1147

1181

if(ret == -1){

1148

1182

if(debug){

1183

ret_errno = errno;

1149

1184

perror_plus("ioctl SIOCGIFFLAGS");

1185

errno = ret_errno;

1150

1186

}

1151

1187

return false;

1152

1188

}

1158

1194

/* Reject the loopback device */

1159

1195

if(ifr->ifr_flags & IFF_LOOPBACK){

1160

1196

if(debug){

1161

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

1162

"Rejecting loopback interface \"%s\"\n", ifname);

1197

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

1198

ifname);

1163

1199

}

1164

1200

return false;

1165

1201

}

1166

1202

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

1167

1203

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1168

1204

if(debug){

1169

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

1170

"Accepting point-to-point interface \"%s\"\n", ifname);

1205

fprintf_plus(stderr, "Accepting point-to-point interface"

1206

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

1171

1207

}

1172

1208

return true;

1173

1209

}

1174

1210

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

1175

1211

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1176

1212

if(debug){

1177

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

1178

"Rejecting non-broadcast interface \"%s\"\n", ifname);

1213

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1214

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

1179

1215

}

1180

1216

return false;

1181

1217

}

1182

1218

/* Reject non-ARP interfaces (including dummy interfaces) */

1183

1219

if(ifr->ifr_flags & IFF_NOARP){

1184

1220

if(debug){

1185

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

1186

"Rejecting non-ARP interface \"%s\"\n", ifname);

1221

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

1222

ifname);

1187

1223

}

1188

1224

return false;

1189

1225

}

1190

1226

1191

1227

/* Accept this device */

1192

1228

if(debug){

1193

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

1194

"Interface \"%s\" is good\n", ifname);

1229

fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);

1195

1230

}

1196

1231

return true;

1197

1232

}

1209

1244

struct ifreq ifr;

1210

1245

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

1211

1246

if(debug){

1212

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

1213

"Failed to get flags for interface \"%s\"\n",

1214

if_entry->d_name);

1215

}

1216

return 0;

1217

}

1218

1219

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

1220

return 0;

1221

}

1222

return 1;

1223

}

1224

1225

/*

1226

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

1227

* corresponds to an acceptable network device which is up.

1228

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

1229

*/

1230

int up_interface(const struct dirent *if_entry){

1231

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

1232

return 0;

1233

}

1234

1235

struct ifreq ifr;

1236

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

1237

if(debug){

1238

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

1239

"Failed to get flags for interface \"%s\"\n",

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

/* Reject down interfaces */

1246

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

1247

if(debug){

1248

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

1249

"Rejecting down interface \"%s\"\n",

1250

if_entry->d_name);

1251

}

1252

return 0;

1253

}

1254

1255

/* Reject non-running interfaces */

1256

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

1257

if(debug){

1258

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

1259

"Rejecting non-running interface \"%s\"\n",

1260

if_entry->d_name);

1261

}

1262

return 0;

1263

}

1264

1265

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

1266

return 0;

1267

}

1268

return 1;

1247

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

1248

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

1249

}

1250

return 0;

1251

}

1252

1253

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

1254

return 0;

1255

}

1256

return 1;

1257

}

1258

1259

/*

1260

* This function determines if a network interface is up.

1261

*/

1262

bool interface_is_up(const char *interface){

1263

struct ifreq ifr;

1264

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

1265

if(debug){

1266

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

1267

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

1268

}

1269

return false;

1270

}

1271

1272

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

1273

}

1274

1275

/*

1276

* This function determines if a network interface is running

1277

*/

1278

bool interface_is_running(const char *interface){

1279

struct ifreq ifr;

1280

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

1281

if(debug){

1282

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

1283

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

1284

}

1285

return false;

1286

}

1287

1288

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

1269

1289

}

1270

1290

1271

1291

int notdotentries(const struct dirent *direntry){

1282

1302

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

1283

1303

int runnable_hook(const struct dirent *direntry){

1284

1304

int ret;

1305

size_t sret;

1285

1306

struct stat st;

1286

1307

1287

1308

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

1289

1310

return 0;

1290

1311

}

1291

1312

1292

/* Save pointer to last character */

1293

char *end = strchr(direntry->d_name, '\0')-1;

1294

1295

if(*end == '~'){

1296

/* Backup name~ */

1297

return 0;

1298

}

1299

1300

if(((direntry->d_name)[0] == '#')

1301

and (*end == '#')){

1302

/* Temporary #name# */

1303

return 0;

1304

}

1305

1306

/* XXX more rules here */

1313

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

1314

"abcdefghijklmnopqrstuvwxyz"

1315

"0123456789"

1316

"_-");

1317

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

1318

/* Contains non-allowed characters */

1319

if(debug){

1320

fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",

1321

direntry->d_name);

1322

}

1323

return 0;

1324

}

1307

1325

1308

1326

char *fullname = NULL;

1309

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

1310

direntry->d_name);

1327

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

1311

1328

if(ret < 0){

1312

1329

perror_plus("asprintf");

1313

1330

return 0;

1316

1333

ret = stat(fullname, &st);

1317

1334

if(ret == -1){

1318

1335

if(debug){

1319

perror_plus("Could not stat plugin");

1336

perror_plus("Could not stat hook");

1320

1337

}

1321

1338

return 0;

1322

1339

}

1323

1340

if(not (S_ISREG(st.st_mode))){

1324

1341

/* Not a regular file */

1342

if(debug){

1343

fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",

1344

direntry->d_name);

1345

}

1325

1346

return 0;

1326

1347

}

1327

1348

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1328

1349

/* Not executable */

1350

if(debug){

1351

fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",

1352

direntry->d_name);

1353

}

1329

1354

return 0;

1330

1355

}

1356

if(debug){

1357

fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",

1358

direntry->d_name);

1359

}

1331

1360

return 1;

1332

1361

}

1333

1362

1334

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1363

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1364

mandos_context *mc){

1335

1365

int ret;

1336

1366

struct timespec now;

1337

1367

struct timespec waited_time;

1338

1368

intmax_t block_time;

1339

1369

1340

1370

while(true){

1341

if(mc.current_server == NULL){

1371

if(mc->current_server == NULL){

1342

1372

if (debug){

1343

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

1344

"Wait until first server is found. No timeout!\n");

1373

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

1374

" No timeout!\n");

1345

1375

}

1346

1376

ret = avahi_simple_poll_iterate(s, -1);

1347

1377

} else {

1348

1378

if (debug){

1349

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

1350

"Check current_server if we should run it,"

1351

" or wait\n");

1379

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

1380

" it, or wait\n");

1352

1381

}

1353

1382

/* the current time */

1354

1383

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1359

1388

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

1360

1389

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

1361

1390

waited_time.tv_sec = (now.tv_sec

1362

- mc.current_server->last_seen.tv_sec);

1391

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

1363

1392

waited_time.tv_nsec = (now.tv_nsec

1364

- mc.current_server->last_seen.tv_nsec);

1393

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

1365

1394

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

1366

1395

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

1367

1396

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

1370

1399

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

1371

1400

1372

1401

if (debug){

1373

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

1374

"Blocking for %" PRIdMAX " ms\n", block_time);

1402

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

1403

block_time);

1375

1404

}

1376

1405

1377

1406

if(block_time <= 0){

1378

ret = start_mandos_communication(mc.current_server->ip,

1379

mc.current_server->port,

1380

mc.current_server->if_index,

1381

mc.current_server->af);

1407

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

1408

mc->current_server->port,

1409

mc->current_server->if_index,

1410

mc->current_server->af, mc);

1382

1411

if(ret == 0){

1383

avahi_simple_poll_quit(mc.simple_poll);

1412

avahi_simple_poll_quit(s);

1384

1413

return 0;

1385

1414

}

1386

1415

ret = clock_gettime(CLOCK_MONOTONIC,

1387

&mc.current_server->last_seen);

1416

&mc->current_server->last_seen);

1388

1417

if(ret == -1){

1389

1418

perror_plus("clock_gettime");

1390

1419

return -1;

1391

1420

}

1392

mc.current_server = mc.current_server->next;

1421

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

1393

1422

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

1394

1423

servers, but don't block */

1395

1424

}

1404

1433

}

1405

1434

}

1406

1435

1436

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

1437

error_t raise_privileges(void){

1438

error_t old_errno = errno;

1439

error_t ret_errno = 0;

1440

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

1441

ret_errno = errno;

1442

perror_plus("seteuid");

1443

}

1444

errno = old_errno;

1445

return ret_errno;

1446

}

1447

1448

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

1449

error_t raise_privileges_permanently(void){

1450

error_t old_errno = errno;

1451

error_t ret_errno = raise_privileges();

1452

if(ret_errno != 0){

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

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

1457

ret_errno = errno;

1458

perror_plus("seteuid");

1459

}

1460

errno = old_errno;

1461

return ret_errno;

1462

}

1463

1464

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

1465

error_t lower_privileges(void){

1466

error_t old_errno = errno;

1467

error_t ret_errno = 0;

1468

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

1469

ret_errno = errno;

1470

perror_plus("seteuid");

1471

}

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

1476

/* Lower privileges permanently */

1477

error_t lower_privileges_permanently(void){

1478

error_t old_errno = errno;

1479

error_t ret_errno = 0;

1480

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

1481

ret_errno = errno;

1482

perror_plus("setuid");

1483

}

1484

errno = old_errno;

1485

return ret_errno;

1486

}

1487

1488

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

1489

const float delay){

1490

struct dirent **direntries;

1491

struct dirent *direntry;

1492

int ret;

1493

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

1494

alphasort);

1495

if(numhooks == -1){

1496

if(errno == ENOENT){

1497

if(debug){

1498

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

1499

" found\n", hookdir);

1500

}

1501

} else {

1502

perror_plus("scandir");

1503

}

1504

} else {

1505

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

1506

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

1507

direntry = direntries[i];

1508

char *fullname = NULL;

1509

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

1510

if(ret < 0){

1511

perror_plus("asprintf");

1512

continue;

1513

}

1514

if(debug){

1515

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

1516

direntry->d_name);

1517

}

1518

pid_t hook_pid = fork();

1519

if(hook_pid == 0){

1520

/* Child */

1521

/* Raise privileges */

1522

raise_privileges_permanently();

1523

/* Set group */

1524

errno = 0;

1525

ret = setgid(0);

1526

if(ret == -1){

1527

perror_plus("setgid");

1528

}

1529

/* Reset supplementary groups */

1530

errno = 0;

1531

ret = setgroups(0, NULL);

1532

if(ret == -1){

1533

perror_plus("setgroups");

1534

}

1535

dup2(devnull, STDIN_FILENO);

1536

close(devnull);

1537

dup2(STDERR_FILENO, STDOUT_FILENO);

1538

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

1539

if(ret == -1){

1540

perror_plus("setenv");

1541

_exit(EX_OSERR);

1542

}

1543

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

1544

if(ret == -1){

1545

perror_plus("setenv");

1546

_exit(EX_OSERR);

1547

}

1548

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

1549

if(ret == -1){

1550

perror_plus("setenv");

1551

_exit(EX_OSERR);

1552

}

1553

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

1554

if(ret == -1){

1555

perror_plus("setenv");

1556

_exit(EX_OSERR);

1557

}

1558

char *delaystring;

1559

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

1560

if(ret == -1){

1561

perror_plus("asprintf");

1562

_exit(EX_OSERR);

1563

}

1564

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

1565

if(ret == -1){

1566

free(delaystring);

1567

perror_plus("setenv");

1568

_exit(EX_OSERR);

1569

}

1570

free(delaystring);

1571

if(connect_to != NULL){

1572

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

1573

if(ret == -1){

1574

perror_plus("setenv");

1575

_exit(EX_OSERR);

1576

}

1577

}

1578

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

1579

perror_plus("execl");

1580

_exit(EXIT_FAILURE);

1581

}

1582

} else {

1583

int status;

1584

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

1585

perror_plus("waitpid");

1586

free(fullname);

1587

continue;

1588

}

1589

if(WIFEXITED(status)){

1590

if(WEXITSTATUS(status) != 0){

1591

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

1592

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

1593

WEXITSTATUS(status));

1594

free(fullname);

1595

continue;

1596

}

1597

} else if(WIFSIGNALED(status)){

1598

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

1599

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

1600

WTERMSIG(status));

1601

free(fullname);

1602

continue;

1603

} else {

1604

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

1605

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

1606

free(fullname);

1607

continue;

1608

}

1609

}

1610

free(fullname);

1611

if(debug){

1612

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

1613

direntry->d_name);

1614

}

1615

}

1616

close(devnull);

1617

}

1618

return true;

1619

}

1620

1621

error_t bring_up_interface(const char *const interface,

1622

const float delay){

1623

int sd = -1;

1624

error_t old_errno = errno;

1625

error_t ret_errno = 0;

1626

int ret, ret_setflags;

1627

struct ifreq network;

1628

unsigned int if_index = if_nametoindex(interface);

1629

if(if_index == 0){

1630

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

1631

errno = old_errno;

1632

return ENXIO;

1633

}

1634

1635

if(quit_now){

1636

errno = old_errno;

1637

return EINTR;

1638

}

1639

1640

if(not interface_is_up(interface)){

1641

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

1642

ret_errno = errno;

1643

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

1644

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

1645

return ret_errno;

1646

}

1647

network.ifr_flags |= IFF_UP;

1648

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1651

ret_errno = errno;

1652

perror_plus("socket");

1653

errno = old_errno;

1654

return ret_errno;

1655

}

1656

1657

if(quit_now){

1658

close(sd);

1659

errno = old_errno;

1660

return EINTR;

1661

}

1662

1663

if(debug){

1664

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

1665

interface);

1666

}

1667

1668

/* Raise priviliges */

1669

raise_privileges();

1670

1671

#ifdef __linux__

1672

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1673

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

1674

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

1675

bool restore_loglevel = true;

1676

if(ret_linux == -1){

1677

restore_loglevel = false;

1678

perror_plus("klogctl");

1679

}

1680

#endif /* __linux__ */

1681

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

1682

ret_errno = errno;

1683

#ifdef __linux__

1684

if(restore_loglevel){

1685

ret_linux = klogctl(7, NULL, 0);

1686

if(ret_linux == -1){

1687

perror_plus("klogctl");

1688

}

1689

}

1690

#endif /* __linux__ */

1691

1692

/* Lower privileges */

1693

lower_privileges();

1694

1695

/* Close the socket */

1696

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

1697

if(ret == -1){

1698

perror_plus("close");

1699

}

1700

1701

if(ret_setflags == -1){

1702

errno = ret_errno;

1703

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1704

errno = old_errno;

1705

return ret_errno;

1706

}

1707

} else if(debug){

1708

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

1709

interface);

1710

}

1711

1712

/* Sleep checking until interface is running.

1713

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

1714

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

1715

if(interface_is_running(interface)){

1716

break;

1717

}

1718

struct timespec sleeptime = { .tv_nsec = 250000000 };

1719

ret = nanosleep(&sleeptime, NULL);

1720

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

1721

perror_plus("nanosleep");

1722

}

1723

}

1724

1725

errno = old_errno;

1726

return 0;

1727

}

1728

1729

error_t take_down_interface(const char *const interface){

1730

int sd = -1;

1731

error_t old_errno = errno;

1732

error_t ret_errno = 0;

1733

int ret, ret_setflags;

1734

struct ifreq network;

1735

unsigned int if_index = if_nametoindex(interface);

1736

if(if_index == 0){

1737

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

1738

errno = old_errno;

1739

return ENXIO;

1740

}

1741

if(interface_is_up(interface)){

1742

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

1743

ret_errno = errno;

1744

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

1745

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

1746

return ret_errno;

1747

}

1748

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

1749

1750

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

if(sd < 0){

1752

ret_errno = errno;

1753

perror_plus("socket");

1754

errno = old_errno;

1755

return ret_errno;

1756

}

1757

1758

if(debug){

1759

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

1760

interface);

1761

}

1762

1763

/* Raise priviliges */

1764

raise_privileges();

1765

1766

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

1767

ret_errno = errno;

1768

1769

/* Lower privileges */

1770

lower_privileges();

1771

1772

/* Close the socket */

1773

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

1774

if(ret == -1){

1775

perror_plus("close");

1776

}

1777

1778

if(ret_setflags == -1){

1779

errno = ret_errno;

1780

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1781

errno = old_errno;

1782

return ret_errno;

1783

}

1784

} else if(debug){

1785

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

1786

interface);

1787

}

1788

1789

errno = old_errno;

1790

return 0;

1791

}

1792

1407

1793

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

1794

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

1795

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

1796

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

1797

.interfaces = NULL, .interfaces_size = 0 };

1408

1798

AvahiSServiceBrowser *sb = NULL;

1409

int error;

1799

error_t ret_errno;

1410

1800

int ret;

1411

1801

intmax_t tmpmax;

1412

1802

char *tmp;

1413

1803

int exitcode = EXIT_SUCCESS;

1414

const char *interface = "";

1415

struct ifreq network;

1416

int sd = -1;

1417

bool take_down_interface = false;

1418

uid_t uid;

1419

gid_t gid;

1804

char *interfaces_to_take_down = NULL;

1805

size_t interfaces_to_take_down_size = 0;

1420

1806

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

1421

1807

bool tempdir_created = false;

1422

1808

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1423

1809

const char *seckey = PATHDIR "/" SECKEY;

1424

1810

const char *pubkey = PATHDIR "/" PUBKEY;

1811

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

1425

1813

1426

1814

bool gnutls_initialized = false;

1427

1815

bool gpgme_initialized = false;

1489

1877

.group = 2 },

1490

1878

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

1491

1879

.arg = "SECONDS",

1492

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

1880

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

1493

1881

.group = 2 },

1494

1882

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

1495

1883

.arg = "DIR",

1518

1906

connect_to = arg;

1519

1907

break;

1520

1908

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

1521

interface = arg;

1909

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

1910

arg, (int)',');

1911

if(ret_errno != 0){

1912

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

1913

}

1522

1914

break;

1523

1915

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

1524

1916

seckey = arg;

1567

1959

argp_state_help(state, state->out_stream,

1568

1960

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1569

1961

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

1570

fprintf(state->out_stream, "Mandos plugin mandos-client: ");

1571

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

1962

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

1572

1963

exit(argp_err_exit_status);

1573

1964

break;

1574

1965

default:

1601

1992

{

1602

1993

/* Work around Debian bug #633582:

1603

1994

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

1604

struct stat st;

1605

1995

1606

1996

/* Re-raise priviliges */

1607

errno = 0;

1608

ret = seteuid(0);

1609

if(ret == -1){

1610

perror_plus("seteuid");

1611

}

1612

1613

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

1614

int seckey_fd = open(seckey, O_RDONLY);

1615

if(seckey_fd == -1){

1616

perror_plus("open");

1617

} else {

1618

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

1619

if(ret == -1){

1620

perror_plus("fstat");

1621

} else {

1622

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1623

ret = fchown(seckey_fd, uid, gid);

1624

if(ret == -1){

1625

perror_plus("fchown");

1626

}

1627

}

1628

}

1629

TEMP_FAILURE_RETRY(close(seckey_fd));

1630

}

1631

}

1632

1633

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

1634

int pubkey_fd = open(pubkey, O_RDONLY);

1635

if(pubkey_fd == -1){

1636

perror_plus("open");

1637

} else {

1638

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

1639

if(ret == -1){

1640

perror_plus("fstat");

1641

} else {

1642

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1643

ret = fchown(pubkey_fd, uid, gid);

1644

if(ret == -1){

1645

perror_plus("fchown");

1646

}

1647

}

1648

}

1649

TEMP_FAILURE_RETRY(close(pubkey_fd));

1650

}

1651

}

1652

1653

/* Lower privileges */

1654

errno = 0;

1655

ret = seteuid(uid);

1656

if(ret == -1){

1657

perror_plus("seteuid");

1658

}

1659

}

1660

1661

/* Find network hooks and run them */

1662

{

1663

struct dirent **direntries;

1664

struct dirent *direntry;

1665

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

1666

alphasort);

1667

if(numhooks == -1){

1668

perror_plus("scandir");

1669

} else {

1670

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

1671

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

1672

direntry = direntries[0];

1673

char *fullname = NULL;

1674

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

1675

if(ret < 0){

1676

perror_plus("asprintf");

1677

continue;

1678

}

1679

pid_t hook_pid = fork();

1680

if(hook_pid == 0){

1681

/* Child */

1682

dup2(devnull, STDIN_FILENO);

1683

close(devnull);

1684

dup2(STDERR_FILENO, STDOUT_FILENO);

1685

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

1686

if(ret == -1){

1687

perror_plus("setenv");

1688

exit(1);

1689

}

1690

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

1691

if(ret == -1){

1692

perror_plus("setenv");

1693

exit(1);

1694

}

1695

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

1696

if(ret == -1){

1697

perror_plus("setenv");

1698

exit(1);

1699

}

1700

char *delaystring;

1701

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

1702

if(ret == -1){

1703

perror_plus("asprintf");

1704

exit(1);

1705

}

1706

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

1707

if(ret == -1){

1708

free(delaystring);

1709

perror_plus("setenv");

1710

exit(1);

1711

}

1712

free(delaystring);

1713

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

1714

perror_plus("execl");

1715

} else {

1716

int status;

1717

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

1718

perror_plus("waitpid");

1719

free(fullname);

1720

continue;

1721

}

1722

if(WIFEXITED(status)){

1723

if(WEXITSTATUS(status) != 0){

1724

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

1725

"Warning: network hook \"%s\" exited"

1726

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

1727

WEXITSTATUS(status));

1728

free(fullname);

1729

continue;

1730

}

1731

} else if(WIFSIGNALED(status)){

1732

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

1733

"Warning: network hook \"%s\" died by"

1734

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

1735

WTERMSIG(status));

1736

free(fullname);

1737

continue;

1738

} else {

1739

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

1740

"Warning: network hook \"%s\" crashed\n",

1741

direntry->d_name);

1742

free(fullname);

1743

continue;

1744

}

1745

}

1746

free(fullname);

1747

if(quit_now){

1748

goto end;

1749

}

1750

}

1751

close(devnull);

1997

if(raise_privileges() == 0){

1998

struct stat st;

1999

2000

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

2001

int seckey_fd = open(seckey, O_RDONLY);

2002

if(seckey_fd == -1){

2003

perror_plus("open");

2004

} else {

2005

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

2006

if(ret == -1){

2007

perror_plus("fstat");

2008

} else {

2009

if(S_ISREG(st.st_mode)

2010

and st.st_uid == 0 and st.st_gid == 0){

2011

ret = fchown(seckey_fd, uid, gid);

2012

if(ret == -1){

2013

perror_plus("fchown");

2014

}

2015

}

2016

}

2017

TEMP_FAILURE_RETRY(close(seckey_fd));

2018

}

2019

}

2020

2021

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

2022

int pubkey_fd = open(pubkey, O_RDONLY);

2023

if(pubkey_fd == -1){

2024

perror_plus("open");

2025

} else {

2026

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

2027

if(ret == -1){

2028

perror_plus("fstat");

2029

} else {

2030

if(S_ISREG(st.st_mode)

2031

and st.st_uid == 0 and st.st_gid == 0){

2032

ret = fchown(pubkey_fd, uid, gid);

2033

if(ret == -1){

2034

perror_plus("fchown");

2035

}

2036

}

2037

}

2038

TEMP_FAILURE_RETRY(close(pubkey_fd));

2039

}

2040

}

2041

2042

/* Lower privileges */

2043

lower_privileges();

2044

}

2045

}

2046

2047

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

2048

{

2049

char *interface = NULL;

2050

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

2051

interface))){

2052

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

2053

and if_nametoindex(interface) == 0){

2054

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

2055

fprintf_plus(stderr, "Not using nonexisting interface"

2056

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

2057

}

2058

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

2059

interface = NULL;

2060

}

2061

}

2062

}

2063

2064

/* Run network hooks */

2065

{

2066

if(mc.interfaces != NULL){

2067

interfaces_hooks = malloc(mc.interfaces_size);

2068

if(interfaces_hooks == NULL){

2069

perror_plus("malloc");

2070

goto end;

2071

}

2072

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

2073

interfaces_hooks_size = mc.interfaces_size;

2074

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2075

(int)',');

2076

}

2077

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2078

interfaces_hooks : "", delay)){

2079

goto end;

1752

2080

}

1753

2081

}

1754

2082

1756

2084

avahi_set_log_function(empty_log);

1757

2085

}

1758

2086

1759

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

1760

struct dirent **direntries;

1761

/* First look for interfaces that are up */

1762

ret = scandir(sys_class_net, &direntries, up_interface,

1763

alphasort);

1764

if(ret == 0){

1765

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

1766

free(direntries);

1767

ret = scandir(sys_class_net, &direntries, good_interface,

1768

alphasort);

1769

}

1770

if(ret >= 1){

1771

/* Pick the first interface returned */

1772

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

1773

if(debug){

1774

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

1775

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

1776

}

1777

if(interface == NULL){

1778

perror_plus("malloc");

1779

free(direntries);

1780

exitcode = EXIT_FAILURE;

1781

goto end;

1782

}

1783

free(direntries);

1784

} else {

1785

free(direntries);

1786

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

1787

"Could not find a network interface\n");

1788

exitcode = EXIT_FAILURE;

1789

goto end;

1790

}

1791

}

1792

1793

2087

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

1794

2088

from the signal handler */

1795

2089

/* Initialize the pseudo-RNG for Avahi */

1796

2090

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

1797

mc.simple_poll = avahi_simple_poll_new();

1798

if(mc.simple_poll == NULL){

1799

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

1800

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

2091

simple_poll = avahi_simple_poll_new();

2092

if(simple_poll == NULL){

2093

fprintf_plus(stderr,

2094

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

1801

2095

exitcode = EX_UNAVAILABLE;

1802

2096

goto end;

1803

2097

}

1865

2159

}

1866

2160

}

1867

2161

1868

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

1869

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

1870

if_index = (AvahiIfIndex) if_nametoindex(interface);

1871

if(if_index == 0){

1872

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

1873

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

1874

exitcode = EX_UNAVAILABLE;

1875

goto end;

1876

}

1877

1878

if(quit_now){

1879

goto end;

1880

}

1881

1882

/* Re-raise priviliges */

1883

errno = 0;

1884

ret = seteuid(0);

1885

if(ret == -1){

1886

perror_plus("seteuid");

1887

}

1888

1889

#ifdef __linux__

1890

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1891

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

1892

ret = klogctl(8, NULL, 5);

1893

bool restore_loglevel = true;

1894

if(ret == -1){

1895

restore_loglevel = false;

1896

perror_plus("klogctl");

1897

}

1898

#endif /* __linux__ */

1899

1900

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1901

if(sd < 0){

1902

perror_plus("socket");

1903

exitcode = EX_OSERR;

1904

#ifdef __linux__

1905

if(restore_loglevel){

1906

ret = klogctl(7, NULL, 0);

1907

if(ret == -1){

1908

perror_plus("klogctl");

1909

}

1910

}

1911

#endif /* __linux__ */

1912

/* Lower privileges */

1913

errno = 0;

1914

ret = seteuid(uid);

1915

if(ret == -1){

1916

perror_plus("seteuid");

1917

}

1918

goto end;

1919

}

1920

strcpy(network.ifr_name, interface);

1921

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

1922

if(ret == -1){

1923

perror_plus("ioctl SIOCGIFFLAGS");

1924

#ifdef __linux__

1925

if(restore_loglevel){

1926

ret = klogctl(7, NULL, 0);

1927

if(ret == -1){

1928

perror_plus("klogctl");

1929

}

1930

}

1931

#endif /* __linux__ */

1932

exitcode = EX_OSERR;

1933

/* Lower privileges */

1934

errno = 0;

1935

ret = seteuid(uid);

1936

if(ret == -1){

1937

perror_plus("seteuid");

1938

}

1939

goto end;

1940

}

1941

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

1942

network.ifr_flags |= IFF_UP;

1943

take_down_interface = true;

1944

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

1945

if(ret == -1){

1946

take_down_interface = false;

1947

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1948

exitcode = EX_OSERR;

1949

#ifdef __linux__

1950

if(restore_loglevel){

1951

ret = klogctl(7, NULL, 0);

1952

if(ret == -1){

1953

perror_plus("klogctl");

2162

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

2163

if(mc.interfaces == NULL){

2164

struct dirent **direntries;

2165

/* Look for any good interfaces */

2166

ret = scandir(sys_class_net, &direntries, good_interface,

2167

alphasort);

2168

if(ret >= 1){

2169

/* Add all found interfaces to interfaces list */

2170

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

2171

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

2172

direntries[i]->d_name);

2173

if(ret_errno != 0){

2174

perror_plus("argz_add");

2175

continue;

2176

}

2177

if(debug){

2178

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

2179

direntries[i]->d_name);

2180

}

2181

}

2182

free(direntries);

2183

} else {

2184

free(direntries);

2185

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

2186

exitcode = EXIT_FAILURE;

2187

goto end;

2188

}

2189

}

2190

2191

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

2192

{

2193

char *interface = NULL;

2194

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

2195

interface))){

2196

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

2197

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

2198

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

2199

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

2200

interface);

2201

interface = NULL;

2202

while((interface = argz_next(mc.interfaces,

2203

mc.interfaces_size, interface))){

2204

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

2205

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

2206

interface);

2207

interface = NULL;

1954

2208

}

1955

2209

}

1956

#endif /* __linux__ */

1957

/* Lower privileges */

1958

errno = 0;

1959

ret = seteuid(uid);

1960

if(ret == -1){

1961

perror_plus("seteuid");

1962

}

1963

goto end;

1964

}

1965

}

1966

/* Sleep checking until interface is running.

1967

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

1968

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

1969

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

1970

if(ret == -1){

1971

perror_plus("ioctl SIOCGIFFLAGS");

1972

} else if(network.ifr_flags & IFF_RUNNING){

1973

2210

break;

1974

2211

}

1975

struct timespec sleeptime = { .tv_nsec = 250000000 };

1976

ret = nanosleep(&sleeptime, NULL);

1977

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

1978

perror_plus("nanosleep");

1979

}

1980

}

1981

if(not take_down_interface){

1982

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

1983

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

1984

if(ret == -1){

1985

perror_plus("close");

1986

}

1987

}

1988

#ifdef __linux__

1989

if(restore_loglevel){

1990

/* Restores kernel loglevel to default */

1991

ret = klogctl(7, NULL, 0);

1992

if(ret == -1){

1993

perror_plus("klogctl");

1994

}

1995

}

1996

#endif /* __linux__ */

1997

/* Lower privileges */

1998

errno = 0;

1999

if(take_down_interface){

2000

/* Lower privileges */

2001

ret = seteuid(uid);

2002

if(ret == -1){

2003

perror_plus("seteuid");

2004

}

2005

} else {

2006

/* Lower privileges permanently */

2007

ret = setuid(uid);

2008

if(ret == -1){

2009

perror_plus("setuid");

2010

}

2011

}

2212

bool interface_was_up = interface_is_up(interface);

2213

ret = bring_up_interface(interface, delay);

2214

if(not interface_was_up){

2215

if(ret != 0){

2216

errno = ret;

2217

perror_plus("Failed to bring up interface");

2218

} else {

2219

ret_errno = argz_add(&interfaces_to_take_down,

2220

&interfaces_to_take_down_size,

2221

interface);

2222

}

2223

}

2224

}

2225

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

2226

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

2227

}

2228

}

2229

2230

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

2231

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

2232

if(debug){

2233

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

2234

mc.interfaces);

2235

}

2236

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

2012

2237

}

2013

2238

2014

2239

if(quit_now){

2015

2240

goto end;

2016

2241

}

2017

2242

2018

ret = init_gnutls_global(pubkey, seckey);

2243

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

2019

2244

if(ret == -1){

2020

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

2021

"init_gnutls_global failed\n");

2245

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

2022

2246

exitcode = EX_UNAVAILABLE;

2023

2247

goto end;

2024

2248

} else {

2039

2263

goto end;

2040

2264

}

2041

2265

2042

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

2043

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

2044

"init_gpgme failed\n");

2266

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

2267

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

2045

2268

exitcode = EX_UNAVAILABLE;

2046

2269

goto end;

2047

2270

} else {

2056

2279

/* Connect directly, do not use Zeroconf */

2057

2280

/* (Mainly meant for debugging) */

2058

2281

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

2282

2059

2283

if(address == NULL){

2060

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

2061

"No colon in address\n");

2284

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

2062

2285

exitcode = EX_USAGE;

2063

2286

goto end;

2064

2287

}

2067

2290

goto end;

2068

2291

}

2069

2292

2070

uint16_t port;

2293

in_port_t port;

2071

2294

errno = 0;

2072

2295

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

2073

2296

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

2074

or tmpmax != (uint16_t)tmpmax){

2075

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

2076

"Bad port number\n");

2297

or tmpmax != (in_port_t)tmpmax){

2298

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

2077

2299

exitcode = EX_USAGE;

2078

2300

goto end;

2079

2301

}

2080

2302

2081

2303

if(quit_now){

2082

2304

goto end;

2083

2305

}

2084

2306

2085

port = (uint16_t)tmpmax;

2307

port = (in_port_t)tmpmax;

2086

2308

*address = '\0';

2087

2309

/* Colon in address indicates IPv6 */

2088

2310

int af;

2104

2326

}

2105

2327

2106

2328

while(not quit_now){

2107

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

2329

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

2330

&mc);

2108

2331

if(quit_now or ret == 0){

2109

2332

break;

2110

2333

}

2111

2334

if(debug){

2112

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

2113

"Retrying in %d seconds\n", (int)retry_interval);

2335

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

2336

(int)retry_interval);

2114

2337

}

2115

sleep((int)retry_interval);

2338

sleep((unsigned int)retry_interval);

2116

2339

}

2117

2340

2118

2341

if (not quit_now){

2136

2359

config.publish_domain = 0;

2137

2360

2138

2361

/* Allocate a new server */

2139

mc.server = avahi_server_new(avahi_simple_poll_get

2140

(mc.simple_poll), &config, NULL,

2141

NULL, &error);

2362

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2363

&config, NULL, NULL, &ret_errno);

2142

2364

2143

2365

/* Free the Avahi configuration data */

2144

2366

avahi_server_config_free(&config);

2146

2368

2147

2369

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

2148

2370

if(mc.server == NULL){

2149

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

2150

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

2151

avahi_strerror(error));

2371

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

2372

avahi_strerror(ret_errno));

2152

2373

exitcode = EX_UNAVAILABLE;

2153

2374

goto end;

2154

2375

}

2160

2381

/* Create the Avahi service browser */

2161

2382

sb = avahi_s_service_browser_new(mc.server, if_index,

2162

2383

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2163

NULL, 0, browse_callback, NULL);

2384

NULL, 0, browse_callback,

2385

(void *)&mc);

2164

2386

if(sb == NULL){

2165

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

2166

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

2167

avahi_strerror(avahi_server_errno(mc.server)));

2387

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

2388

avahi_strerror(avahi_server_errno(mc.server)));

2168

2389

exitcode = EX_UNAVAILABLE;

2169

2390

goto end;

2170

2391

}

2176

2397

/* Run the main loop */

2177

2398

2178

2399

if(debug){

2179

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

2180

"Starting Avahi loop search\n");

2400

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

2181

2401

}

2182

2402

2183

ret = avahi_loop_with_timeout(mc.simple_poll,

2184

(int)(retry_interval * 1000));

2403

ret = avahi_loop_with_timeout(simple_poll,

2404

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

2185

2405

if(debug){

2186

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

2187

"avahi_loop_with_timeout exited %s\n",

2188

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

2406

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

2407

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

2189

2408

}

2190

2409

2191

2410

end:

2192

2411

2193

2412

if(debug){

2194

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

2195

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

2413

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

2196

2414

}

2197

2415

2198

2416

/* Cleanup things */

2417

free(mc.interfaces);

2418

2199

2419

if(sb != NULL)

2200

2420

avahi_s_service_browser_free(sb);

2201

2421

2202

2422

if(mc.server != NULL)

2203

2423

avahi_server_free(mc.server);

2204

2424

2205

if(mc.simple_poll != NULL)

2206

avahi_simple_poll_free(mc.simple_poll);

2425

if(simple_poll != NULL)

2426

avahi_simple_poll_free(simple_poll);

2207

2427

2208

2428

if(gnutls_initialized){

2209

2429

gnutls_certificate_free_credentials(mc.cred);

2214

2434

if(gpgme_initialized){

2215

2435

gpgme_release(mc.ctx);

2216

2436

}

2217

2437

2218

2438

/* Cleans up the circular linked list of Mandos servers the client

2219

2439

has seen */

2220

2440

if(mc.current_server != NULL){

2226

2446

}

2227

2447

}

2228

2448

2229

/* XXX run network hooks "stop" here */

2230

2231

/* Take down the network interface */

2232

if(take_down_interface){

2233

/* Re-raise priviliges */

2234

errno = 0;

2235

ret = seteuid(0);

2236

if(ret == -1){

2237

perror_plus("seteuid");

2238

}

2239

if(geteuid() == 0){

2240

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

2241

if(ret == -1){

2242

perror_plus("ioctl SIOCGIFFLAGS");

2243

} else if(network.ifr_flags & IFF_UP){

2244

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

2245

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

2246

if(ret == -1){

2247

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2449

/* Re-raise priviliges */

2450

{

2451

raise_privileges();

2452

2453

/* Run network hooks */

2454

run_network_hooks("stop", interfaces_hooks != NULL ?

2455

interfaces_hooks : "", delay);

2456

2457

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

2458

{

2459

char *interface = NULL;

2460

while((interface=argz_next(interfaces_to_take_down,

2461

interfaces_to_take_down_size,

2462

interface))){

2463

ret_errno = take_down_interface(interface);

2464

if(ret_errno != 0){

2465

errno = ret_errno;

2466

perror_plus("Failed to take down interface");

2248

2467

}

2249

2468

}

2250

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

2251

if(ret == -1){

2252

perror_plus("close");

2253

}

2254

/* Lower privileges permanently */

2255

errno = 0;

2256

ret = setuid(uid);

2257

if(ret == -1){

2258

perror_plus("setuid");

2469

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

2470

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

2471

" down\n");

2259

2472

}

2260

2473

}

2474

2475

lower_privileges_permanently();

2261

2476

}

2262

2477

2478

free(interfaces_to_take_down);

2479

free(interfaces_hooks);

2480

2263

2481

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

2264

2482

if(tempdir_created){

2265

2483

struct dirent **direntries = NULL;

2278

2496

}

2279

2497

ret = remove(fullname);

2280

2498

if(ret == -1){

2281

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

2282

"remove(\"%s\"): %s\n", fullname, strerror(errno));

2499

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

2500

strerror(errno));

2283

2501

}

2284

2502

free(fullname);

2285

2503

}