/mandos/release : revision 237.2.183

9

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

10

*

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* Everything else is

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13

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13

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*

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

16

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

26

* along with this program. If not, see

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* <http://www.gnu.org/licenses/>.

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*

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* Contact the authors at <mandos@recompile.se>.

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* Contact the authors at <mandos@fukt.bsnet.se>.

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*/

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32

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

56

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

56

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

57

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

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inet_pton(), connect() */

59

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

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

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strtoimax() */

64

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

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

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program_invocation_short_name */

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

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

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

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

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68

SIOCSIFFLAGS, if_indextoname(),

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69

if_nametoindex(), IF_NAMESIZE */

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72

*/

74

73

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

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

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

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

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setgid(), pause() */

76

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

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

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78

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

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79

argp_state, struct argp,

85

84

raise() */

86

85

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

87

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

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

91

87

92

88

#ifdef __linux__

93

89

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

111

107

init_gnutls_session(),

112

108

GNUTLS_* */

113

109

#include <gnutls/openpgp.h>

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

116

112

117

113

/* GPGME */

118

114

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

126

122

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

127

123

#define SECKEY "seckey.txt"

128

124

#define PUBKEY "pubkey.txt"

129

#define HOOKDIR "/lib/mandos/network-hooks.d"

130

125

131

126

bool debug = false;

132

127

static const char mandos_protocol_version[] = "1";

133

128

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

134

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

129

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

135

130

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

136

131

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

139

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

140

typedef struct server{

141

const char *ip;

142

uint16_t port;

143

AvahiIfIndex if_index;

144

int af;

145

struct timespec last_seen;

146

struct server *next;

147

struct server *prev;

148

} server;

149

132

150

133

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

151

134

typedef struct {

156

139

gnutls_dh_params_t dh_params;

157

140

const char *priority;

158

141

gpgme_ctx_t ctx;

159

server *current_server;

160

142

} mandos_context;

161

143

162

144

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

163

145

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

164

146

.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

147

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

167

148

168

149

sig_atomic_t quit_now = 0;

169

150

int signal_received = 0;

170

151

171

/* Function to use when printing errors */

172

void perror_plus(const char *print_text){

173

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

174

program_invocation_short_name);

175

perror(print_text);

176

}

177

178

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

179

va_list ap;

180

va_start (ap, format);

181

182

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

183

program_invocation_short_name));

184

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

185

}

186

187

152

/*

188

153

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

189

154

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

190

155

* "buffer_length" is how much is already used.

191

156

*/

192

157

size_t incbuffer(char **buffer, size_t buffer_length,

193

size_t buffer_capacity){

158

size_t buffer_capacity){

194

159

if(buffer_length + BUFFER_SIZE > buffer_capacity){

195

160

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

196

161

if(buffer == NULL){

201

166

return buffer_capacity;

202

167

}

203

168

204

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

205

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

206

int af){

207

int ret;

208

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

209

if(new_server == NULL){

210

perror_plus("malloc");

211

return false;

212

}

213

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

214

.port = port,

215

.if_index = if_index,

216

.af = af };

217

if(new_server->ip == NULL){

218

perror_plus("strdup");

219

return false;

220

}

221

/* Special case of first server */

222

if (mc.current_server == NULL){

223

new_server->next = new_server;

224

new_server->prev = new_server;

225

mc.current_server = new_server;

226

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

227

} else {

228

new_server->next = mc.current_server;

229

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

230

new_server->prev->next = new_server;

231

mc.current_server->prev = new_server;

232

}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return false;

237

}

238

return true;

239

}

240

241

169

/*

242

170

* Initialize GPGME.

243

171

*/

244

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

245

const char *tempdir){

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

246

174

gpgme_error_t rc;

247

175

gpgme_engine_info_t engine_info;

248

176

257

185

258

186

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

259

187

if(fd == -1){

260

perror_plus("open");

188

perror("open");

261

189

return false;

262

190

}

263

191

264

192

rc = gpgme_data_new_from_fd(&pgp_data, fd);

265

193

if(rc != GPG_ERR_NO_ERROR){

266

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

267

gpgme_strsource(rc), gpgme_strerror(rc));

194

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

195

gpgme_strsource(rc), gpgme_strerror(rc));

268

196

return false;

269

197

}

270

198

271

199

rc = gpgme_op_import(mc.ctx, pgp_data);

272

200

if(rc != GPG_ERR_NO_ERROR){

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

275

203

return false;

276

204

}

277

205

278

206

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

279

207

if(ret == -1){

280

perror_plus("close");

208

perror("close");

281

209

}

282

210

gpgme_data_release(pgp_data);

283

211

return true;

284

212

}

285

213

286

214

if(debug){

287

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

215

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

288

216

}

289

217

290

218

/* Init GPGME */

291

219

gpgme_check_version(NULL);

292

220

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

293

221

if(rc != GPG_ERR_NO_ERROR){

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

222

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

223

gpgme_strsource(rc), gpgme_strerror(rc));

296

224

return false;

297

225

}

298

226

299

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

227

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

300

228

rc = gpgme_get_engine_info(&engine_info);

301

229

if(rc != GPG_ERR_NO_ERROR){

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

230

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

231

gpgme_strsource(rc), gpgme_strerror(rc));

304

232

return false;

305

233

}

306

234

while(engine_info != NULL){

312

240

engine_info = engine_info->next;

313

241

}

314

242

if(engine_info == NULL){

315

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

316

tempdir);

243

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

317

244

return false;

318

245

}

319

246

320

247

/* Create new GPGME "context" */

321

248

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

322

249

if(rc != GPG_ERR_NO_ERROR){

323

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

324

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

325

gpgme_strerror(rc));

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

326

252

return false;

327

253

}

328

254

347

273

ssize_t plaintext_length = 0;

348

274

349

275

if(debug){

350

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

276

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

351

277

}

352

278

353

279

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

354

280

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

355

281

0);

356

282

if(rc != GPG_ERR_NO_ERROR){

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

359

285

return -1;

360

286

}

361

287

362

288

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

363

289

rc = gpgme_data_new(&dh_plain);

364

290

if(rc != GPG_ERR_NO_ERROR){

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

368

293

gpgme_data_release(dh_crypto);

369

294

return -1;

370

295

}

373

298

data buffer */

374

299

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

375

300

if(rc != GPG_ERR_NO_ERROR){

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

378

303

plaintext_length = -1;

379

304

if(debug){

380

305

gpgme_decrypt_result_t result;

381

306

result = gpgme_op_decrypt_result(mc.ctx);

382

307

if(result == NULL){

383

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

308

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

384

309

} else {

385

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

386

result->unsupported_algorithm);

387

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

388

result->wrong_key_usage);

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

389

314

if(result->file_name != NULL){

390

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

315

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

391

316

}

392

317

gpgme_recipient_t recipient;

393

318

recipient = result->recipients;

394

319

while(recipient != NULL){

395

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

396

gpgme_pubkey_algo_name

397

(recipient->pubkey_algo));

398

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

399

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

400

recipient->status == GPG_ERR_NO_SECKEY

401

? "No" : "Yes");

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

402

326

recipient = recipient->next;

403

327

}

404

328

}

407

331

}

408

332

409

333

if(debug){

410

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

334

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

411

335

}

412

336

413

337

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

414

338

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

415

perror_plus("gpgme_data_seek");

339

perror("gpgme_data_seek");

416

340

plaintext_length = -1;

417

341

goto decrypt_end;

418

342

}

420

344

*plaintext = NULL;

421

345

while(true){

422

346

plaintext_capacity = incbuffer(plaintext,

423

(size_t)plaintext_length,

424

plaintext_capacity);

347

(size_t)plaintext_length,

348

plaintext_capacity);

425

349

if(plaintext_capacity == 0){

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

429

353

}

430

354

431

355

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

436

360

break;

437

361

}

438

362

if(ret < 0){

439

perror_plus("gpgme_data_read");

363

perror("gpgme_data_read");

440

364

plaintext_length = -1;

441

365

goto decrypt_end;

442

366

}

444

368

}

445

369

446

370

if(debug){

447

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

371

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

448

372

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

449

373

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

450

374

}

472

396

/* GnuTLS log function callback */

473

397

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

474

398

const char* string){

475

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

399

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

476

400

}

477

401

478

402

static int init_gnutls_global(const char *pubkeyfilename,

480

404

int ret;

481

405

482

406

if(debug){

483

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

407

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

484

408

}

485

409

486

410

ret = gnutls_global_init();

487

411

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

412

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

413

safer_gnutls_strerror(ret));

490

414

return -1;

491

415

}

492

416

499

423

}

500

424

501

425

/* OpenPGP credentials */

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

503

427

if(ret != GNUTLS_E_SUCCESS){

504

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

505

safer_gnutls_strerror(ret));

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

506

433

gnutls_global_deinit();

507

434

return -1;

508

435

}

509

436

510

437

if(debug){

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

438

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

439

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

440

seckeyfilename);

515

441

}

516

442

517

443

ret = gnutls_certificate_set_openpgp_key_file

518

444

(mc.cred, pubkeyfilename, seckeyfilename,

519

445

GNUTLS_OPENPGP_FMT_BASE64);

520

446

if(ret != GNUTLS_E_SUCCESS){

521

fprintf_plus(stderr,

522

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

523

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

524

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

525

safer_gnutls_strerror(ret));

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

526

452

goto globalfail;

527

453

}

528

454

529

455

/* GnuTLS server initialization */

530

456

ret = gnutls_dh_params_init(&mc.dh_params);

531

457

if(ret != GNUTLS_E_SUCCESS){

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

458

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

459

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

535

460

goto globalfail;

536

461

}

537

462

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

538

463

if(ret != GNUTLS_E_SUCCESS){

539

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

540

safer_gnutls_strerror(ret));

464

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

465

safer_gnutls_strerror(ret));

541

466

goto globalfail;

542

467

}

543

468

563

488

}

564

489

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

565

490

if(ret != GNUTLS_E_SUCCESS){

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

569

493

}

570

494

571

495

{

578

502

}

579

503

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

580

504

if(ret != GNUTLS_E_SUCCESS){

581

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

582

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

583

safer_gnutls_strerror(ret));

505

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

506

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

507

safer_gnutls_strerror(ret));

584

508

gnutls_deinit(*session);

585

509

return -1;

586

510

}

595

519

}

596

520

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

597

521

if(ret != GNUTLS_E_SUCCESS){

598

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

599

safer_gnutls_strerror(ret));

522

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

523

safer_gnutls_strerror(ret));

600

524

gnutls_deinit(*session);

601

525

return -1;

602

526

}

647

571

pf = PF_INET;

648

572

break;

649

573

default:

650

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

574

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

651

575

errno = EINVAL;

652

576

return -1;

653

577

}

658

582

}

659

583

660

584

if(debug){

661

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

662

PRIu16 "\n", ip, port);

585

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

586

"\n", ip, port);

663

587

}

664

588

665

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

666

590

if(tcp_sd < 0){

667

591

int e = errno;

668

perror_plus("socket");

592

perror("socket");

669

593

errno = e;

670

594

goto mandos_end;

671

595

}

685

609

}

686

610

if(ret < 0 ){

687

611

int e = errno;

688

perror_plus("inet_pton");

612

perror("inet_pton");

689

613

errno = e;

690

614

goto mandos_end;

691

615

}

692

616

if(ret == 0){

693

617

int e = errno;

694

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

618

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

695

619

errno = e;

696

620

goto mandos_end;

697

621

}

702

626

703

627

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

628

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

705

-Wunreachable-code*/

629

-Wunreachable-code*/

706

630

if(if_index == AVAHI_IF_UNSPEC){

707

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

708

" incomplete without a network interface\n");

631

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

632

" without a network interface\n");

709

633

errno = EINVAL;

710

634

goto mandos_end;

711

635

}

727

651

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

728

652

char interface[IF_NAMESIZE];

729

653

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

730

perror_plus("if_indextoname");

654

perror("if_indextoname");

731

655

} else {

732

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

733

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

656

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

657

ip, interface, port);

734

658

}

735

659

} else {

736

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

737

ip, port);

660

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

661

port);

738

662

}

739

663

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

664

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

747

671

sizeof(addrstr));

748

672

}

749

673

if(pcret == NULL){

750

perror_plus("inet_ntop");

674

perror("inet_ntop");

751

675

} else {

752

676

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

753

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

677

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

754

678

}

755

679

}

756

680

}

766

690

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

767

691

}

768

692

if(ret < 0){

769

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

770

int e = errno;

771

perror_plus("connect");

772

errno = e;

773

}

693

int e = errno;

694

perror("connect");

695

errno = e;

774

696

goto mandos_end;

775

697

}

776

698

784

706

while(true){

785

707

size_t out_size = strlen(out);

786

708

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

787

out_size - written));

709

out_size - written));

788

710

if(ret == -1){

789

711

int e = errno;

790

perror_plus("write");

712

perror("write");

791

713

errno = e;

792

714

goto mandos_end;

793

715

}

810

732

}

811

733

812

734

if(debug){

813

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

735

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

814

736

}

815

737

816

738

if(quit_now){

818

740

goto mandos_end;

819

741

}

820

742

821

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

822

743

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

823

744

824

745

if(quit_now){

836

757

837

758

if(ret != GNUTLS_E_SUCCESS){

838

759

if(debug){

839

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

760

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

840

761

gnutls_perror(ret);

841

762

}

842

763

errno = EPROTO;

846

767

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

847

768

848

769

if(debug){

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

770

fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",

771

ip);

851

772

}

852

773

853

774

while(true){

858

779

}

859

780

860

781

buffer_capacity = incbuffer(&buffer, buffer_length,

861

buffer_capacity);

782

buffer_capacity);

862

783

if(buffer_capacity == 0){

863

784

int e = errno;

864

perror_plus("incbuffer");

785

perror("incbuffer");

865

786

errno = e;

866

787

goto mandos_end;

867

788

}

891

812

}

892

813

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

893

814

if(ret < 0){

894

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

895

"***\n");

815

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

896

816

gnutls_perror(ret);

897

817

errno = EPROTO;

898

818

goto mandos_end;

899

819

}

900

820

break;

901

821

default:

902

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

903

" encrypted session with Mandos server\n");

822

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

823

" encrypted session with Mandos server\n");

904

824

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

825

errno = EIO;

906

826

goto mandos_end;

911

831

}

912

832

913

833

if(debug){

914

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

834

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

915

835

}

916

836

917

837

if(quit_now){

929

849

930

850

if(buffer_length > 0){

931

851

ssize_t decrypted_buffer_size;

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

852

decrypted_buffer_size = pgp_packet_decrypt(buffer,

853

buffer_length,

933

854

&decrypted_buffer);

934

855

if(decrypted_buffer_size >= 0){

935

856

946

867

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

947

868

int e = errno;

948

869

if(debug){

949

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

950

strerror(errno));

870

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

871

strerror(errno));

951

872

}

952

873

errno = e;

953

874

goto mandos_end;

972

893

if(e == 0){

973

894

e = errno;

974

895

}

975

perror_plus("close");

896

perror("close");

976

897

}

977

898

gnutls_deinit(session);

978

errno = e;

979

899

if(quit_now){

980

errno = EINTR;

900

e = EINTR;

981

901

retval = -1;

982

902

}

903

errno = e;

983

904

}

984

905

return retval;

985

906

}

1010

931

switch(event){

1011

932

default:

1012

933

case AVAHI_RESOLVER_FAILURE:

1013

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

1014

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

1015

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

934

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

935

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

936

avahi_strerror(avahi_server_errno(mc.server)));

1017

937

break;

1018

938

1019

939

case AVAHI_RESOLVER_FOUND:

1021

941

char ip[AVAHI_ADDRESS_STR_MAX];

1022

942

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

1023

943

if(debug){

1024

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

1025

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

1026

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

944

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

945

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

946

ip, (intmax_t)interface, port);

1027

947

}

1028

948

int ret = start_mandos_communication(ip, port, interface,

1029

949

avahi_proto_to_af(proto));

1030

950

if(ret == 0){

1031

951

avahi_simple_poll_quit(mc.simple_poll);

1032

} else {

1033

if(not add_server(ip, port, interface,

1034

avahi_proto_to_af(proto))){

1035

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

1036

" list\n", name);

1037

}

1038

952

}

1039

953

}

1040

954

}

1064

978

default:

1065

979

case AVAHI_BROWSER_FAILURE:

1066

980

1067

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

1068

avahi_strerror(avahi_server_errno(mc.server)));

981

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

982

avahi_strerror(avahi_server_errno(mc.server)));

1069

983

avahi_simple_poll_quit(mc.simple_poll);

1070

984

return;

1071

985

1078

992

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

1079

993

name, type, domain, protocol, 0,

1080

994

resolve_callback, NULL) == NULL)

1081

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

1082

" %s\n", name,

1083

avahi_strerror(avahi_server_errno(mc.server)));

995

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

996

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

1084

997

break;

1085

998

1086

999

case AVAHI_BROWSER_REMOVE:

1089

1002

case AVAHI_BROWSER_ALL_FOR_NOW:

1090

1003

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1091

1004

if(debug){

1092

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

1093

" searching...\n");

1005

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

1094

1006

}

1095

1007

break;

1096

1008

}

1097

1009

}

1098

1010

1099

/* Signal handler that stops main loop after SIGTERM */

1011

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

1100

1012

static void handle_sigterm(int sig){

1101

1013

if(quit_now){

1102

1014

return;

1104

1016

quit_now = 1;

1105

1017

signal_received = sig;

1106

1018

int old_errno = errno;

1107

/* set main loop to exit */

1108

1019

if(mc.simple_poll != NULL){

1109

1020

avahi_simple_poll_quit(mc.simple_poll);

1110

1021

}

1111

1022

errno = old_errno;

1112

1023

}

1113

1024

1114

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

1115

int ret;

1116

1117

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

1118

if(s < 0){

1119

perror_plus("socket");

1120

return false;

1121

}

1122

strcpy(ifr->ifr_name, ifname);

1123

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1124

if(ret == -1){

1025

/*

1026

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

1027

* corresponds to an acceptable network device.

1028

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

1029

*/

1030

int good_interface(const struct dirent *if_entry){

1031

ssize_t ssret;

1032

char *flagname = NULL;

1033

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

1034

if_entry->d_name);

1035

if(ret < 0){

1036

perror("asprintf");

1037

return 0;

1038

}

1039

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

1040

return 0;

1041

}

1042

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

1043

if(flags_fd == -1){

1044

perror("open");

1045

return 0;

1046

}

1047

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

1048

/* read line from flags_fd */

1049

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

1050

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

1051

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

1052

if(flagstring == NULL){

1053

perror("malloc");

1054

close(flags_fd);

1055

return 0;

1056

}

1057

while(to_read > 0){

1058

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

1059

(size_t)to_read));

1060

if(ssret == -1){

1061

perror("read");

1062

free(flagstring);

1063

close(flags_fd);

1064

return 0;

1065

}

1066

to_read -= ssret;

1067

if(ssret == 0){

1068

break;

1069

}

1070

}

1071

close(flags_fd);

1072

intmax_t tmpmax;

1073

char *tmp;

1074

errno = 0;

1075

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

1076

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

1077

and not (isspace(*tmp)))

1078

or tmpmax != (ifreq_flags)tmpmax){

1125

1079

if(debug){

1126

perror_plus("ioctl SIOCGIFFLAGS");

1080

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

1081

flagstring, if_entry->d_name);

1127

1082

}

1128

return false;

1083

free(flagstring);

1084

return 0;

1129

1085

}

1130

return true;

1131

}

1132

1133

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

1134

1086

free(flagstring);

1087

ifreq_flags flags = (ifreq_flags)tmpmax;

1135

1088

/* Reject the loopback device */

1136

if(ifr->ifr_flags & IFF_LOOPBACK){

1089

if(flags & IFF_LOOPBACK){

1137

1090

if(debug){

1138

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

1139

ifname);

1091

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

1092

if_entry->d_name);

1140

1093

}

1141

return false;

1094

return 0;

1142

1095

}

1143

1096

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

1144

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

1097

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

1145

1098

if(debug){

1146

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

1147

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

1099

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

1100

if_entry->d_name);

1148

1101

}

1149

return true;

1102

return 1;

1150

1103

}

1151

1104

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

1152

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

1153

if(debug){

1154

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1155

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

1156

}

1157

return false;

1158

}

1159

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

1160

if(ifr->ifr_flags & IFF_NOARP){

1161

if(debug){

1162

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

1163

ifname);

1164

}

1165

return false;

1166

}

1167

1105

if(not (flags & IFF_BROADCAST)){

1106

if(debug){

1107

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

1108

if_entry->d_name);

1109

}

1110

return 0;

1111

}

1168

1112

/* Accept this device */

1169

1113

if(debug){

1170

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

1171

}

1172

return true;

1173

}

1174

1175

/*

1176

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

1177

* corresponds to an acceptable network device.

1178

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

1179

*/

1180

int good_interface(const struct dirent *if_entry){

1181

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

1182

return 0;

1183

}

1184

1185

struct ifreq ifr;

1186

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

1187

if(debug){

1188

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

1189

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

1190

}

1191

return 0;

1192

}

1193

1194

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

1195

return 0;

1196

}

1197

return 1;

1198

}

1199

1200

/*

1201

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

1202

* corresponds to an acceptable network device which is up.

1203

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

1204

*/

1205

int up_interface(const struct dirent *if_entry){

1206

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

1207

return 0;

1208

}

1209

1210

struct ifreq ifr;

1211

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

1212

if(debug){

1213

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

1214

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

1215

}

1216

return 0;

1217

}

1218

1219

/* Reject down interfaces */

1220

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

1221

if(debug){

1222

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

1223

if_entry->d_name);

1224

}

1225

return 0;

1226

}

1227

1228

/* Reject non-running interfaces */

1229

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

1230

if(debug){

1231

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

1232

if_entry->d_name);

1233

}

1234

return 0;

1235

}

1236

1237

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

1238

return 0;

1239

}

1240

return 1;

1241

}

1242

1243

int notdotentries(const struct dirent *direntry){

1244

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

1245

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

1246

and (direntry->d_name[1] == '\0'

1247

or (direntry->d_name[1] == '.'

1248

and direntry->d_name[2] == '\0'))){

1249

return 0;

1250

}

1251

return 1;

1252

}

1253

1254

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

1255

int runnable_hook(const struct dirent *direntry){

1256

int ret;

1257

size_t sret;

1258

struct stat st;

1259

1260

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

1261

/* Empty name? */

1262

return 0;

1263

}

1264

1265

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

1266

"abcdefghijklmnopqrstuvwxyz"

1267

"0123456789"

1268

"_-");

1269

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

1270

/* Contains non-allowed characters */

1271

if(debug){

1272

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

1273

direntry->d_name);

1274

}

1275

return 0;

1276

}

1277

1278

char *fullname = NULL;

1279

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

1280

if(ret < 0){

1281

perror_plus("asprintf");

1282

return 0;

1283

}

1284

1285

ret = stat(fullname, &st);

1286

if(ret == -1){

1287

if(debug){

1288

perror_plus("Could not stat hook");

1289

}

1290

return 0;

1291

}

1292

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

1293

/* Not a regular file */

1294

if(debug){

1295

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

1296

direntry->d_name);

1297

}

1298

return 0;

1299

}

1300

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

1301

/* Not executable */

1302

if(debug){

1303

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

1304

direntry->d_name);

1305

}

1306

return 0;

1307

}

1308

if(debug){

1309

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

1310

direntry->d_name);

1311

}

1312

return 1;

1313

}

1314

1315

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1316

int ret;

1317

struct timespec now;

1318

struct timespec waited_time;

1319

intmax_t block_time;

1320

1321

while(true){

1322

if(mc.current_server == NULL){

1323

if (debug){

1324

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

1325

" No timeout!\n");

1326

}

1327

ret = avahi_simple_poll_iterate(s, -1);

1328

} else {

1329

if (debug){

1330

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

1331

" it, or wait\n");

1332

}

1333

/* the current time */

1334

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1335

if(ret == -1){

1336

perror_plus("clock_gettime");

1337

return -1;

1338

}

1339

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

1340

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

1341

waited_time.tv_sec = (now.tv_sec

1342

- mc.current_server->last_seen.tv_sec);

1343

waited_time.tv_nsec = (now.tv_nsec

1344

- mc.current_server->last_seen.tv_nsec);

1345

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

1346

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

1347

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

1348

block_time = ((retry_interval

1349

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

1350

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

1351

1352

if (debug){

1353

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

1354

block_time);

1355

}

1356

1357

if(block_time <= 0){

1358

ret = start_mandos_communication(mc.current_server->ip,

1359

mc.current_server->port,

1360

mc.current_server->if_index,

1361

mc.current_server->af);

1362

if(ret == 0){

1363

avahi_simple_poll_quit(mc.simple_poll);

1364

return 0;

1365

}

1366

ret = clock_gettime(CLOCK_MONOTONIC,

1367

&mc.current_server->last_seen);

1368

if(ret == -1){

1369

perror_plus("clock_gettime");

1370

return -1;

1371

}

1372

mc.current_server = mc.current_server->next;

1373

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

1374

servers, but don't block */

1375

}

1376

1377

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

1378

}

1379

if(ret != 0){

1380

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

1381

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

1382

}

1383

}

1384

}

1385

}

1386

1387

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

1388

const float delay){

1389

struct dirent **direntries;

1390

struct dirent *direntry;

1391

int ret;

1392

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

1393

alphasort);

1394

if(numhooks == -1){

1395

perror_plus("scandir");

1396

} else {

1397

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

1398

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

1399

direntry = direntries[i];

1400

char *fullname = NULL;

1401

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

1402

if(ret < 0){

1403

perror_plus("asprintf");

1404

continue;

1405

}

1406

if(debug){

1407

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

1408

direntry->d_name);

1409

}

1410

pid_t hook_pid = fork();

1411

if(hook_pid == 0){

1412

/* Child */

1413

/* Raise privileges */

1414

errno = 0;

1415

ret = seteuid(0);

1416

if(ret == -1){

1417

perror_plus("seteuid");

1418

}

1419

/* Raise privileges even more */

1420

errno = 0;

1421

ret = setuid(0);

1422

if(ret == -1){

1423

perror_plus("setuid");

1424

}

1425

/* Set group */

1426

errno = 0;

1427

ret = setgid(0);

1428

if(ret == -1){

1429

perror_plus("setgid");

1430

}

1431

/* Reset supplementary groups */

1432

errno = 0;

1433

ret = setgroups(0, NULL);

1434

if(ret == -1){

1435

perror_plus("setgroups");

1436

}

1437

dup2(devnull, STDIN_FILENO);

1438

close(devnull);

1439

dup2(STDERR_FILENO, STDOUT_FILENO);

1440

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

1441

if(ret == -1){

1442

perror_plus("setenv");

1443

_exit(EX_OSERR);

1444

}

1445

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

1446

if(ret == -1){

1447

perror_plus("setenv");

1448

_exit(EX_OSERR);

1449

}

1450

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

1451

if(ret == -1){

1452

perror_plus("setenv");

1453

_exit(EX_OSERR);

1454

}

1455

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

1456

if(ret == -1){

1457

perror_plus("setenv");

1458

_exit(EX_OSERR);

1459

}

1460

char *delaystring;

1461

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

1462

if(ret == -1){

1463

perror_plus("asprintf");

1464

_exit(EX_OSERR);

1465

}

1466

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

1467

if(ret == -1){

1468

free(delaystring);

1469

perror_plus("setenv");

1470

_exit(EX_OSERR);

1471

}

1472

free(delaystring);

1473

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

1474

perror_plus("execl");

1475

} else {

1476

int status;

1477

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

1478

perror_plus("waitpid");

1479

free(fullname);

1480

continue;

1481

}

1482

if(WIFEXITED(status)){

1483

if(WEXITSTATUS(status) != 0){

1484

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

1485

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

1486

WEXITSTATUS(status));

1487

free(fullname);

1488

continue;

1489

}

1490

} else if(WIFSIGNALED(status)){

1491

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

1492

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

1493

WTERMSIG(status));

1494

free(fullname);

1495

continue;

1496

} else {

1497

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

1498

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

1499

free(fullname);

1500

continue;

1501

}

1502

}

1503

free(fullname);

1504

if(debug){

1505

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

1506

direntry->d_name);

1507

}

1508

}

1509

close(devnull);

1510

}

1511

return true;

1114

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

1115

if_entry->d_name);

1116

}

1117

return 1;

1512

1118

}

1513

1119

1514

1120

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

1533

1139

bool gnutls_initialized = false;

1534

1140

bool gpgme_initialized = false;

1535

1141

float delay = 2.5f;

1536

double retry_interval = 10; /* 10s between trying a server and

1537

retrying the same server again */

1538

1142

1539

1143

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1540

1144

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1546

1150

errno = 0;

1547

1151

ret = setgid(gid);

1548

1152

if(ret == -1){

1549

perror_plus("setgid");

1153

perror("setgid");

1550

1154

}

1551

1155

1552

1156

/* Lower user privileges (temporarily) */

1553

1157

errno = 0;

1554

1158

ret = seteuid(uid);

1555

1159

if(ret == -1){

1556

perror_plus("seteuid");

1160

perror("seteuid");

1557

1161

}

1558

1162

1559

1163

if(quit_now){

1594

1198

.arg = "SECONDS",

1595

1199

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

1596

1200

.group = 2 },

1597

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

1598

.arg = "SECONDS",

1599

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

1600

.group = 2 },

1601

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

1602

.arg = "DIR",

1603

.doc = "Directory where network hooks are located",

1604

.group = 2 },

1605

1201

/*

1606

1202

* These reproduce what we would get without ARGP_NO_HELP

1607

1203

*/

1651

1247

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

1652

1248

argp_error(state, "Bad delay");

1653

1249

}

1654

case 132: /* --retry */

1655

errno = 0;

1656

retry_interval = strtod(arg, &tmp);

1657

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

1658

or (retry_interval * 1000) > INT_MAX

1659

or retry_interval < 0){

1660

argp_error(state, "Bad retry interval");

1661

}

1662

break;

1663

case 133: /* --network-hook-dir */

1664

hookdir = arg;

1665

1250

break;

1666

1251

/*

1667

1252

* These reproduce what we would get without ARGP_NO_HELP

1674

1259

argp_state_help(state, state->out_stream,

1675

1260

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1676

1261

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

1677

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

1262

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

1678

1263

exit(argp_err_exit_status);

1679

1264

break;

1680

1265

default:

1695

1280

case ENOMEM:

1696

1281

default:

1697

1282

errno = ret;

1698

perror_plus("argp_parse");

1283

perror("argp_parse");

1699

1284

exitcode = EX_OSERR;

1700

1285

goto end;

1701

1286

case EINVAL:

1703

1288

goto end;

1704

1289

}

1705

1290

}

1706

1707

{

1708

/* Work around Debian bug #633582:

1709

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

1710

1711

/* Re-raise priviliges */

1712

errno = 0;

1713

ret = seteuid(0);

1714

if(ret == -1){

1715

perror_plus("seteuid");

1716

} else {

1717

struct stat st;

1718

1719

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

1720

int seckey_fd = open(seckey, O_RDONLY);

1721

if(seckey_fd == -1){

1722

perror_plus("open");

1723

} else {

1724

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

1725

if(ret == -1){

1726

perror_plus("fstat");

1727

} else {

1728

if(S_ISREG(st.st_mode)

1729

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

1730

ret = fchown(seckey_fd, uid, gid);

1731

if(ret == -1){

1732

perror_plus("fchown");

1733

}

1734

}

1735

}

1736

TEMP_FAILURE_RETRY(close(seckey_fd));

1737

}

1738

}

1739

1740

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

1741

int pubkey_fd = open(pubkey, O_RDONLY);

1742

if(pubkey_fd == -1){

1743

perror_plus("open");

1744

} else {

1745

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

1746

if(ret == -1){

1747

perror_plus("fstat");

1748

} else {

1749

if(S_ISREG(st.st_mode)

1750

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

1751

ret = fchown(pubkey_fd, uid, gid);

1752

if(ret == -1){

1753

perror_plus("fchown");

1754

}

1755

}

1756

}

1757

TEMP_FAILURE_RETRY(close(pubkey_fd));

1758

}

1759

}

1760

1761

/* Lower privileges */

1762

errno = 0;

1763

ret = seteuid(uid);

1764

if(ret == -1){

1765

perror_plus("seteuid");

1766

}

1767

}

1768

}

1769

1770

/* Run network hooks */

1771

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

1772

goto end;

1773

}

1774

1291

1775

1292

if(not debug){

1776

1293

avahi_set_log_function(empty_log);

1777

1294

}

1778

1295

1779

1296

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

1780

1297

struct dirent **direntries;

1781

/* First look for interfaces that are up */

1782

ret = scandir(sys_class_net, &direntries, up_interface,

1298

ret = scandir(sys_class_net, &direntries, good_interface,

1783

1299

alphasort);

1784

if(ret == 0){

1785

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

1786

free(direntries);

1787

ret = scandir(sys_class_net, &direntries, good_interface,

1788

alphasort);

1789

}

1790

1300

if(ret >= 1){

1791

/* Pick the first interface returned */

1301

/* Pick the first good interface */

1792

1302

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

1793

1303

if(debug){

1794

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

1304

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

1795

1305

}

1796

1306

if(interface == NULL){

1797

perror_plus("malloc");

1307

perror("malloc");

1798

1308

free(direntries);

1799

1309

exitcode = EXIT_FAILURE;

1800

1310

goto end;

1802

1312

free(direntries);

1803

1313

} else {

1804

1314

free(direntries);

1805

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

1315

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

1806

1316

exitcode = EXIT_FAILURE;

1807

1317

goto end;

1808

1318

}

1814

1324

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

1815

1325

mc.simple_poll = avahi_simple_poll_new();

1816

1326

if(mc.simple_poll == NULL){

1817

fprintf_plus(stderr,

1818

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

1327

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

1819

1328

exitcode = EX_UNAVAILABLE;

1820

1329

goto end;

1821

1330

}

1823

1332

sigemptyset(&sigterm_action.sa_mask);

1824

1333

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

1825

1334

if(ret == -1){

1826

perror_plus("sigaddset");

1335

perror("sigaddset");

1827

1336

exitcode = EX_OSERR;

1828

1337

goto end;

1829

1338

}

1830

1339

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

1831

1340

if(ret == -1){

1832

perror_plus("sigaddset");

1341

perror("sigaddset");

1833

1342

exitcode = EX_OSERR;

1834

1343

goto end;

1835

1344

}

1836

1345

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

1837

1346

if(ret == -1){

1838

perror_plus("sigaddset");

1347

perror("sigaddset");

1839

1348

exitcode = EX_OSERR;

1840

1349

goto end;

1841

1350

}

1845

1354

*/

1846

1355

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

1847

1356

if(ret == -1){

1848

perror_plus("sigaction");

1357

perror("sigaction");

1849

1358

return EX_OSERR;

1850

1359

}

1851

1360

if(old_sigterm_action.sa_handler != SIG_IGN){

1852

1361

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

1853

1362

if(ret == -1){

1854

perror_plus("sigaction");

1363

perror("sigaction");

1855

1364

exitcode = EX_OSERR;

1856

1365

goto end;

1857

1366

}

1858

1367

}

1859

1368

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

1860

1369

if(ret == -1){

1861

perror_plus("sigaction");

1370

perror("sigaction");

1862

1371

return EX_OSERR;

1863

1372

}

1864

1373

if(old_sigterm_action.sa_handler != SIG_IGN){

1865

1374

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

1866

1375

if(ret == -1){

1867

perror_plus("sigaction");

1376

perror("sigaction");

1868

1377

exitcode = EX_OSERR;

1869

1378

goto end;

1870

1379

}

1871

1380

}

1872

1381

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

1873

1382

if(ret == -1){

1874

perror_plus("sigaction");

1383

perror("sigaction");

1875

1384

return EX_OSERR;

1876

1385

}

1877

1386

if(old_sigterm_action.sa_handler != SIG_IGN){

1878

1387

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

1879

1388

if(ret == -1){

1880

perror_plus("sigaction");

1389

perror("sigaction");

1881

1390

exitcode = EX_OSERR;

1882

1391

goto end;

1883

1392

}

1887

1396

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

1888

1397

if_index = (AvahiIfIndex) if_nametoindex(interface);

1889

1398

if(if_index == 0){

1890

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

1399

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

1891

1400

exitcode = EX_UNAVAILABLE;

1892

1401

goto end;

1893

1402

}

1900

1409

errno = 0;

1901

1410

ret = seteuid(0);

1902

1411

if(ret == -1){

1903

perror_plus("seteuid");

1412

perror("seteuid");

1904

1413

}

1905

1414

1906

1415

#ifdef __linux__

1910

1419

bool restore_loglevel = true;

1911

1420

if(ret == -1){

1912

1421

restore_loglevel = false;

1913

perror_plus("klogctl");

1422

perror("klogctl");

1914

1423

}

1915

1424

#endif /* __linux__ */

1916

1425

1917

1426

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1918

1427

if(sd < 0){

1919

perror_plus("socket");

1428

perror("socket");

1920

1429

exitcode = EX_OSERR;

1921

1430

#ifdef __linux__

1922

1431

if(restore_loglevel){

1923

1432

ret = klogctl(7, NULL, 0);

1924

1433

if(ret == -1){

1925

perror_plus("klogctl");

1434

perror("klogctl");

1926

1435

}

1927

1436

}

1928

1437

#endif /* __linux__ */

1930

1439

errno = 0;

1931

1440

ret = seteuid(uid);

1932

1441

if(ret == -1){

1933

perror_plus("seteuid");

1442

perror("seteuid");

1934

1443

}

1935

1444

goto end;

1936

1445

}

1937

1446

strcpy(network.ifr_name, interface);

1938

1447

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

1939

1448

if(ret == -1){

1940

perror_plus("ioctl SIOCGIFFLAGS");

1449

perror("ioctl SIOCGIFFLAGS");

1941

1450

#ifdef __linux__

1942

1451

if(restore_loglevel){

1943

1452

ret = klogctl(7, NULL, 0);

1944

1453

if(ret == -1){

1945

perror_plus("klogctl");

1454

perror("klogctl");

1946

1455

}

1947

1456

}

1948

1457

#endif /* __linux__ */

1951

1460

errno = 0;

1952

1461

ret = seteuid(uid);

1953

1462

if(ret == -1){

1954

perror_plus("seteuid");

1463

perror("seteuid");

1955

1464

}

1956

1465

goto end;

1957

1466

}

1961

1470

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

1962

1471

if(ret == -1){

1963

1472

take_down_interface = false;

1964

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1473

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1965

1474

exitcode = EX_OSERR;

1966

1475

#ifdef __linux__

1967

1476

if(restore_loglevel){

1968

1477

ret = klogctl(7, NULL, 0);

1969

1478

if(ret == -1){

1970

perror_plus("klogctl");

1479

perror("klogctl");

1971

1480

}

1972

1481

}

1973

1482

#endif /* __linux__ */

1975

1484

errno = 0;

1976

1485

ret = seteuid(uid);

1977

1486

if(ret == -1){

1978

perror_plus("seteuid");

1487

perror("seteuid");

1979

1488

}

1980

1489

goto end;

1981

1490

}

1982

1491

}

1983

/* Sleep checking until interface is running.

1984

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

1492

/* sleep checking until interface is running */

1985

1493

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

1986

1494

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

1987

1495

if(ret == -1){

1988

perror_plus("ioctl SIOCGIFFLAGS");

1496

perror("ioctl SIOCGIFFLAGS");

1989

1497

} else if(network.ifr_flags & IFF_RUNNING){

1990

1498

break;

1991

1499

}

1992

1500

struct timespec sleeptime = { .tv_nsec = 250000000 };

1993

1501

ret = nanosleep(&sleeptime, NULL);

1994

1502

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

1995

perror_plus("nanosleep");

1503

perror("nanosleep");

1996

1504

}

1997

1505

}

1998

1506

if(not take_down_interface){

1999

1507

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

2000

1508

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

2001

1509

if(ret == -1){

2002

perror_plus("close");

1510

perror("close");

2003

1511

}

2004

1512

}

2005

1513

#ifdef __linux__

2007

1515

/* Restores kernel loglevel to default */

2008

1516

ret = klogctl(7, NULL, 0);

2009

1517

if(ret == -1){

2010

perror_plus("klogctl");

1518

perror("klogctl");

2011

1519

}

2012

1520

}

2013

1521

#endif /* __linux__ */

2014

1522

/* Lower privileges */

2015

1523

errno = 0;

2016

/* Lower privileges */

2017

ret = seteuid(uid);

2018

if(ret == -1){

2019

perror_plus("seteuid");

1524

if(take_down_interface){

1525

/* Lower privileges */

1526

ret = seteuid(uid);

1527

if(ret == -1){

1528

perror("seteuid");

1529

}

1530

} else {

1531

/* Lower privileges permanently */

1532

ret = setuid(uid);

1533

if(ret == -1){

1534

perror("setuid");

1535

}

2020

1536

}

2021

1537

}

2022

1538

2026

1542

2027

1543

ret = init_gnutls_global(pubkey, seckey);

2028

1544

if(ret == -1){

2029

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

1545

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

2030

1546

exitcode = EX_UNAVAILABLE;

2031

1547

goto end;

2032

1548

} else {

2037

1553

goto end;

2038

1554

}

2039

1555

1556

tempdir_created = true;

2040

1557

if(mkdtemp(tempdir) == NULL){

2041

perror_plus("mkdtemp");

1558

tempdir_created = false;

1559

perror("mkdtemp");

2042

1560

goto end;

2043

1561

}

2044

tempdir_created = true;

2045

1562

2046

1563

if(quit_now){

2047

1564

goto end;

2048

1565

}

2049

1566

2050

1567

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

2051

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

1568

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

2052

1569

exitcode = EX_UNAVAILABLE;

2053

1570

goto end;

2054

1571

} else {

2064

1581

/* (Mainly meant for debugging) */

2065

1582

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

2066

1583

if(address == NULL){

2067

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

1584

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

2068

1585

exitcode = EX_USAGE;

2069

1586

goto end;

2070

1587

}

2078

1595

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

2079

1596

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

2080

1597

or tmpmax != (uint16_t)tmpmax){

2081

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

1598

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

2082

1599

exitcode = EX_USAGE;

2083

1600

goto end;

2084

1601

}

2089

1606

2090

1607

port = (uint16_t)tmpmax;

2091

1608

*address = '\0';

1609

address = connect_to;

2092

1610

/* Colon in address indicates IPv6 */

2093

1611

int af;

2094

if(strchr(connect_to, ':') != NULL){

1612

if(strchr(address, ':') != NULL){

2095

1613

af = AF_INET6;

2096

/* Accept [] around IPv6 address - see RFC 5952 */

2097

if(connect_to[0] == '[' and address[-1] == ']')

2098

{

2099

connect_to++;

2100

address[-1] = '\0';

2101

}

2102

1614

} else {

2103

1615

af = AF_INET;

2104

1616

}

2105

address = connect_to;

2106

1617

2107

1618

if(quit_now){

2108

1619

goto end;

2109

1620

}

2110

1621

2111

while(not quit_now){

2112

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

2113

if(quit_now or ret == 0){

2114

break;

2115

}

2116

if(debug){

2117

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

2118

(int)retry_interval);

2119

}

2120

sleep((int)retry_interval);

2121

}

2122

2123

if (not quit_now){

1622

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

1623

if(ret < 0){

1624

switch(errno){

1625

case ENETUNREACH:

1626

case EHOSTDOWN:

1627

case EHOSTUNREACH:

1628

exitcode = EX_NOHOST;

1629

break;

1630

case EINVAL:

1631

exitcode = EX_USAGE;

1632

break;

1633

case EIO:

1634

exitcode = EX_IOERR;

1635

break;

1636

case EPROTO:

1637

exitcode = EX_PROTOCOL;

1638

break;

1639

default:

1640

exitcode = EX_OSERR;

1641

break;

1642

}

1643

} else {

2124

1644

exitcode = EXIT_SUCCESS;

2125

1645

}

2126

2127

1646

goto end;

2128

1647

}

2129

1648

2151

1670

2152

1671

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

2153

1672

if(mc.server == NULL){

2154

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

2155

avahi_strerror(error));

1673

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

1674

avahi_strerror(error));

2156

1675

exitcode = EX_UNAVAILABLE;

2157

1676

goto end;

2158

1677

}

2166

1685

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2167

1686

NULL, 0, browse_callback, NULL);

2168

1687

if(sb == NULL){

2169

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

2170

avahi_strerror(avahi_server_errno(mc.server)));

1688

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

1689

avahi_strerror(avahi_server_errno(mc.server)));

2171

1690

exitcode = EX_UNAVAILABLE;

2172

1691

goto end;

2173

1692

}

2179

1698

/* Run the main loop */

2180

1699

2181

1700

if(debug){

2182

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

2183

}

2184

2185

ret = avahi_loop_with_timeout(mc.simple_poll,

2186

(int)(retry_interval * 1000));

2187

if(debug){

2188

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

2189

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

2190

}

1701

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

1702

}

1703

1704

avahi_simple_poll_loop(mc.simple_poll);

2191

1705

2192

1706

end:

2193

1707

2194

1708

if(debug){

2195

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

1709

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

2196

1710

}

2197

1711

2198

1712

/* Cleanup things */

2215

1729

gpgme_release(mc.ctx);

2216

1730

}

2217

1731

2218

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

2219

has seen */

2220

if(mc.current_server != NULL){

2221

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

2222

while(mc.current_server != NULL){

2223

server *next = mc.current_server->next;

2224

free(mc.current_server);

2225

mc.current_server = next;

2226

}

2227

}

2228

2229

/* Run network hooks */

2230

run_network_hooks("stop", interface, delay);

2231

2232

/* Re-raise priviliges */

2233

{

1732

/* Take down the network interface */

1733

if(take_down_interface){

1734

/* Re-raise priviliges */

2234

1735

errno = 0;

2235

1736

ret = seteuid(0);

2236

1737

if(ret == -1){

2237

perror_plus("seteuid");

1738

perror("seteuid");

2238

1739

}

2239

2240

/* Take down the network interface */

2241

if(take_down_interface and geteuid() == 0){

1740

if(geteuid() == 0){

2242

1741

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

2243

1742

if(ret == -1){

2244

perror_plus("ioctl SIOCGIFFLAGS");

2245

} else if(network.ifr_flags & IFF_UP){

1743

perror("ioctl SIOCGIFFLAGS");

1744

} else if(network.ifr_flags & IFF_UP) {

2246

1745

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

2247

1746

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

2248

1747

if(ret == -1){

2249

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1748

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2250

1749

}

2251

1750

}

2252

1751

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

2253

1752

if(ret == -1){

2254

perror_plus("close");

1753

perror("close");

1754

}

1755

/* Lower privileges permanently */

1756

errno = 0;

1757

ret = setuid(uid);

1758

if(ret == -1){

1759

perror("setuid");

2255

1760

}

2256

1761

}

2257

1762

}

2258

/* Lower privileges permanently */

2259

errno = 0;

2260

ret = setuid(uid);

2261

if(ret == -1){

2262

perror_plus("setuid");

2263

}

2264

1763

2265

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

1764

/* Removes the temp directory used by GPGME */

2266

1765

if(tempdir_created){

2267

struct dirent **direntries = NULL;

2268

struct dirent *direntry = NULL;

2269

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

2270

alphasort);

2271

if (numentries > 0){

2272

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

2273

direntry = direntries[i];

1766

DIR *d;

1767

struct dirent *direntry;

1768

d = opendir(tempdir);

1769

if(d == NULL){

1770

if(errno != ENOENT){

1771

perror("opendir");

1772

}

1773

} else {

1774

while(true){

1775

direntry = readdir(d);

1776

if(direntry == NULL){

1777

break;

1778

}

1779

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

1780

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

1781

and (direntry->d_name[1] == '\0'

1782

or (direntry->d_name[1] == '.'

1783

and direntry->d_name[2] == '\0'))){

1784

continue;

1785

}

2274

1786

char *fullname = NULL;

2275

1787

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

2276

1788

direntry->d_name);

2277

1789

if(ret < 0){

2278

perror_plus("asprintf");

1790

perror("asprintf");

2279

1791

continue;

2280

1792

}

2281

1793

ret = remove(fullname);

2282

1794

if(ret == -1){

2283

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

2284

strerror(errno));

1795

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

1796

strerror(errno));

2285

1797

}

2286

1798

free(fullname);

2287

1799

}

2288

}

2289

2290

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

2291

free(direntries);

2292

if (numentries == -1){

2293

perror_plus("scandir");

1800

closedir(d);

2294

1801

}

2295

1802

ret = rmdir(tempdir);

2296

1803

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

2297

perror_plus("rmdir");

1804

perror("rmdir");

2298

1805

}

2299

1806

}

2300

1807

2305

1812

&old_sigterm_action,

2306

1813

NULL));

2307

1814

if(ret == -1){

2308

perror_plus("sigaction");

1815

perror("sigaction");

2309

1816

}

2310

1817

do {

2311

1818

ret = raise(signal_received);

2312

1819

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

2313

1820

if(ret != 0){

2314

perror_plus("raise");

1821

perror("raise");

2315

1822

abort();

2316

1823

}

2317

1824

TEMP_FAILURE_RETRY(pause());