/mandos/release : revision 237.15.6

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

10

*

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* Everything else is

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*

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

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

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* 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@fukt.bsnet.se>.

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

30

*/

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32

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

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stdout, ferror(), remove() */

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

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

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

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srand(), strtof() */

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

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strtof(), abort() */

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

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

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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

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strtoimax() */

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

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

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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INET_ADDRSTRLEN, INET6_ADDRSTRLEN

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73

*/

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74

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

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

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setgid() */

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

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

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setgid(), pause() */

77

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

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

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79

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

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argp_state, struct argp,

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83

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

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sigaction(), SIGTERM, sig_atomic_t,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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90

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91

#ifdef __linux__

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92

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

105

110

init_gnutls_session(),

106

111

GNUTLS_* */

107

112

#include <gnutls/openpgp.h>

108

/* gnutls_certificate_set_openpgp_key_file(),

109

GNUTLS_OPENPGP_FMT_BASE64 */

113

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

110

115

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116

/* GPGME */

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117

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

120

125

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

121

126

#define SECKEY "seckey.txt"

122

127

#define PUBKEY "pubkey.txt"

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

123

129

124

130

bool debug = false;

125

131

static const char mandos_protocol_version[] = "1";

126

132

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

127

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

133

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

134

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

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

138

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

139

typedef struct server{

140

const char *ip;

141

uint16_t port;

142

AvahiIfIndex if_index;

143

int af;

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struct timespec last_seen;

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struct server *next;

146

struct server *prev;

147

} server;

128

148

129

149

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

130

150

typedef struct {

135

155

gnutls_dh_params_t dh_params;

136

156

const char *priority;

137

157

gpgme_ctx_t ctx;

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server *current_server;

138

159

} mandos_context;

139

160

140

161

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

141

162

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

142

163

.dh_bits = 1024, .priority = "SECURE256"

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

164

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

165

.current_server = NULL };

166

167

sig_atomic_t quit_now = 0;

168

int signal_received = 0;

169

170

/* Function to use when printing errors */

171

void perror_plus(const char *print_text){

172

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

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program_invocation_short_name);

174

perror(print_text);

175

}

176

177

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

178

va_list ap;

179

va_start (ap, format);

180

181

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));

182

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

183

}

144

184

145

185

/*

146

186

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

148

188

* "buffer_length" is how much is already used.

149

189

*/

150

190

size_t incbuffer(char **buffer, size_t buffer_length,

151

size_t buffer_capacity){

191

size_t buffer_capacity){

152

192

if(buffer_length + BUFFER_SIZE > buffer_capacity){

153

193

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

154

194

if(buffer == NULL){

159

199

return buffer_capacity;

160

200

}

161

201

202

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

203

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

204

int af){

205

int ret;

206

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

207

if(new_server == NULL){

208

perror_plus("malloc");

209

return -1;

210

}

211

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

212

.port = port,

213

.if_index = if_index,

214

.af = af };

215

if(new_server->ip == NULL){

216

perror_plus("strdup");

217

return -1;

218

}

219

/* Special case of first server */

220

if (mc.current_server == NULL){

221

new_server->next = new_server;

222

new_server->prev = new_server;

223

mc.current_server = new_server;

224

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

225

} else {

226

new_server->next = mc.current_server;

227

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

228

new_server->prev->next = new_server;

229

mc.current_server->prev = new_server;

230

}

231

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

232

if(ret == -1){

233

perror_plus("clock_gettime");

234

return -1;

235

}

236

return 0;

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}

238

162

239

/*

163

240

* Initialize GPGME.

164

241

*/

165

static bool init_gpgme(const char *seckey,

166

const char *pubkey, const char *tempdir){

167

int ret;

242

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

243

const char *tempdir){

168

244

gpgme_error_t rc;

169

245

gpgme_engine_info_t engine_info;

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246

173

249

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

174

250

*/

175

251

bool import_key(const char *filename){

252

int ret;

176

253

int fd;

177

254

gpgme_data_t pgp_data;

178

255

179

256

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

180

257

if(fd == -1){

181

perror("open");

258

perror_plus("open");

182

259

return false;

183

260

}

184

261

185

262

rc = gpgme_data_new_from_fd(&pgp_data, fd);

186

263

if(rc != GPG_ERR_NO_ERROR){

187

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

264

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

188

265

gpgme_strsource(rc), gpgme_strerror(rc));

189

266

return false;

190

267

}

191

268

192

269

rc = gpgme_op_import(mc.ctx, pgp_data);

193

270

if(rc != GPG_ERR_NO_ERROR){

194

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

271

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

195

272

gpgme_strsource(rc), gpgme_strerror(rc));

196

273

return false;

197

274

}

198

275

199

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

200

277

if(ret == -1){

201

perror("close");

278

perror_plus("close");

202

279

}

203

280

gpgme_data_release(pgp_data);

204

281

return true;

205

282

}

206

283

207

284

if(debug){

208

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

285

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

209

286

}

210

287

211

288

/* Init GPGME */

212

289

gpgme_check_version(NULL);

213

290

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

214

291

if(rc != GPG_ERR_NO_ERROR){

215

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

292

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

216

293

gpgme_strsource(rc), gpgme_strerror(rc));

217

294

return false;

218

295

}

219

296

220

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

297

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

221

298

rc = gpgme_get_engine_info(&engine_info);

222

299

if(rc != GPG_ERR_NO_ERROR){

223

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

300

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

224

301

gpgme_strsource(rc), gpgme_strerror(rc));

225

302

return false;

226

303

}

233

310

engine_info = engine_info->next;

234

311

}

235

312

if(engine_info == NULL){

236

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

313

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

237

314

return false;

238

315

}

239

316

240

317

/* Create new GPGME "context" */

241

318

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

242

319

if(rc != GPG_ERR_NO_ERROR){

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

320

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

321

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

322

gpgme_strerror(rc));

245

323

return false;

246

324

}

247

325

266

344

ssize_t plaintext_length = 0;

267

345

268

346

if(debug){

269

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

347

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

270

348

}

271

349

272

350

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

273

351

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

274

352

0);

275

353

if(rc != GPG_ERR_NO_ERROR){

276

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

354

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

277

355

gpgme_strsource(rc), gpgme_strerror(rc));

278

356

return -1;

279

357

}

281

359

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

282

360

rc = gpgme_data_new(&dh_plain);

283

361

if(rc != GPG_ERR_NO_ERROR){

284

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

362

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

363

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

285

364

gpgme_strsource(rc), gpgme_strerror(rc));

286

365

gpgme_data_release(dh_crypto);

287

366

return -1;

291

370

data buffer */

292

371

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

293

372

if(rc != GPG_ERR_NO_ERROR){

294

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

373

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

295

374

gpgme_strsource(rc), gpgme_strerror(rc));

296

375

plaintext_length = -1;

297

376

if(debug){

298

377

gpgme_decrypt_result_t result;

299

378

result = gpgme_op_decrypt_result(mc.ctx);

300

379

if(result == NULL){

301

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

380

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

302

381

} else {

303

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

382

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

304

383

result->unsupported_algorithm);

305

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

384

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

306

385

result->wrong_key_usage);

307

386

if(result->file_name != NULL){

308

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

387

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

309

388

}

310

389

gpgme_recipient_t recipient;

311

390

recipient = result->recipients;

312

391

while(recipient != NULL){

313

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

392

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

314

393

gpgme_pubkey_algo_name(recipient->pubkey_algo));

315

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

316

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

394

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

395

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

317

396

recipient->status == GPG_ERR_NO_SECKEY

318

397

? "No" : "Yes");

319

398

recipient = recipient->next;

324

403

}

325

404

326

405

if(debug){

327

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

406

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

328

407

}

329

408

330

409

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

331

410

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

332

perror("gpgme_data_seek");

411

perror_plus("gpgme_data_seek");

333

412

plaintext_length = -1;

334

413

goto decrypt_end;

335

414

}

337

416

*plaintext = NULL;

338

417

while(true){

339

418

plaintext_capacity = incbuffer(plaintext,

340

(size_t)plaintext_length,

341

plaintext_capacity);

419

(size_t)plaintext_length,

420

plaintext_capacity);

342

421

if(plaintext_capacity == 0){

343

perror("incbuffer");

344

plaintext_length = -1;

345

goto decrypt_end;

422

perror_plus("incbuffer");

423

plaintext_length = -1;

424

goto decrypt_end;

346

425

}

347

426

348

427

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

353

432

break;

354

433

}

355

434

if(ret < 0){

356

perror("gpgme_data_read");

435

perror_plus("gpgme_data_read");

357

436

plaintext_length = -1;

358

437

goto decrypt_end;

359

438

}

361

440

}

362

441

363

442

if(debug){

364

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

443

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

365

444

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

366

445

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

367

446

}

389

468

/* GnuTLS log function callback */

390

469

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

391

470

const char* string){

392

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

471

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

393

472

}

394

473

395

474

static int init_gnutls_global(const char *pubkeyfilename,

397

476

int ret;

398

477

399

478

if(debug){

400

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

479

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

401

480

}

402

481

403

482

ret = gnutls_global_init();

404

483

if(ret != GNUTLS_E_SUCCESS){

405

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

406

safer_gnutls_strerror(ret));

484

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

407

485

return -1;

408

486

}

409

487

416

494

}

417

495

418

496

/* OpenPGP credentials */

419

gnutls_certificate_allocate_credentials(&mc.cred);

497

ret = gnutls_certificate_allocate_credentials(&mc.cred);

420

498

if(ret != GNUTLS_E_SUCCESS){

421

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

422

from

423

-Wunreachable-code

424

*/

425

safer_gnutls_strerror(ret));

499

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

426

500

gnutls_global_deinit();

427

501

return -1;

428

502

}

429

503

430

504

if(debug){

431

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

505

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

432

506

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

433

507

seckeyfilename);

434

508

}

437

511

(mc.cred, pubkeyfilename, seckeyfilename,

438

512

GNUTLS_OPENPGP_FMT_BASE64);

439

513

if(ret != GNUTLS_E_SUCCESS){

440

fprintf(stderr,

441

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

442

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

443

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

444

safer_gnutls_strerror(ret));

514

fprintf_plus(stderr,

515

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

516

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

517

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

445

518

goto globalfail;

446

519

}

447

520

448

521

/* GnuTLS server initialization */

449

522

ret = gnutls_dh_params_init(&mc.dh_params);

450

523

if(ret != GNUTLS_E_SUCCESS){

451

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

524

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

452

525

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

453

526

goto globalfail;

454

527

}

455

528

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

456

529

if(ret != GNUTLS_E_SUCCESS){

457

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

530

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

458

531

safer_gnutls_strerror(ret));

459

532

goto globalfail;

460

533

}

474

547

static int init_gnutls_session(gnutls_session_t *session){

475

548

int ret;

476

549

/* GnuTLS session creation */

477

ret = gnutls_init(session, GNUTLS_SERVER);

550

do {

551

ret = gnutls_init(session, GNUTLS_SERVER);

552

if(quit_now){

553

return -1;

554

}

555

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

478

556

if(ret != GNUTLS_E_SUCCESS){

479

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

557

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

480

558

safer_gnutls_strerror(ret));

481

559

}

482

560

483

561

{

484

562

const char *err;

485

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

563

do {

564

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

565

if(quit_now){

566

gnutls_deinit(*session);

567

return -1;

568

}

569

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

486

570

if(ret != GNUTLS_E_SUCCESS){

487

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

488

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

489

safer_gnutls_strerror(ret));

571

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

572

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

490

573

gnutls_deinit(*session);

491

574

return -1;

492

575

}

493

576

}

494

577

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

578

do {

579

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

580

mc.cred);

581

if(quit_now){

582

gnutls_deinit(*session);

583

return -1;

584

}

585

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

497

586

if(ret != GNUTLS_E_SUCCESS){

498

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

587

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

499

588

safer_gnutls_strerror(ret));

500

589

gnutls_deinit(*session);

501

590

return -1;

502

591

}

503

592

504

593

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

594

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

595

508

596

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

597

514

602

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

515

603

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

516

604

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

520

605

/* Called when a Mandos server is found */

521

606

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

522

607

AvahiIfIndex if_index,

528

613

struct sockaddr_in6 in6;

529

614

} to;

530

615

char *buffer = NULL;

531

char *decrypted_buffer;

616

char *decrypted_buffer = NULL;

532

617

size_t buffer_length = 0;

533

618

size_t buffer_capacity = 0;

534

ssize_t decrypted_buffer_size;

535

619

size_t written;

536

int retval = 0;

620

int retval = -1;

537

621

gnutls_session_t session;

538

622

int pf; /* Protocol family */

539

623

624

errno = 0;

625

540

626

if(quit_now){

627

errno = EINTR;

541

628

return -1;

542

629

}

543

630

549

636

pf = PF_INET;

550

637

break;

551

638

default:

552

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

639

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

640

errno = EINVAL;

553

641

return -1;

554

642

}

555

643

559

647

}

560

648

561

649

if(debug){

562

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

650

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

563

651

"\n", ip, port);

564

652

}

565

653

566

654

tcp_sd = socket(pf, SOCK_STREAM, 0);

567

655

if(tcp_sd < 0){

568

perror("socket");

569

retval = -1;

656

int e = errno;

657

perror_plus("socket");

658

errno = e;

570

659

goto mandos_end;

571

660

}

572

661

573

662

if(quit_now){

663

errno = EINTR;

574

664

goto mandos_end;

575

665

}

576

666

583

673

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

584

674

}

585

675

if(ret < 0 ){

586

perror("inet_pton");

587

retval = -1;

676

int e = errno;

677

perror_plus("inet_pton");

678

errno = e;

588

679

goto mandos_end;

589

680

}

590

681

if(ret == 0){

591

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

592

retval = -1;

682

int e = errno;

683

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

684

errno = e;

593

685

goto mandos_end;

594

686

}

595

687

if(af == AF_INET6){

599

691

600

692

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

601

693

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

602

-Wunreachable-code*/

694

-Wunreachable-code*/

603

695

if(if_index == AVAHI_IF_UNSPEC){

604

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

696

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

605

697

" without a network interface\n");

606

retval = -1;

698

errno = EINVAL;

607

699

goto mandos_end;

608

700

}

609

701

/* Set the network interface number as scope */

616

708

}

617

709

618

710

if(quit_now){

711

errno = EINTR;

619

712

goto mandos_end;

620

713

}

621

714

623

716

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

624

717

char interface[IF_NAMESIZE];

625

718

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

626

perror("if_indextoname");

719

perror_plus("if_indextoname");

627

720

} else {

628

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

721

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

629

722

ip, interface, port);

630

723

}

631

724

} else {

632

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

633

port);

725

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

634

726

}

635

727

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

636

728

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

643

735

sizeof(addrstr));

644

736

}

645

737

if(pcret == NULL){

646

perror("inet_ntop");

738

perror_plus("inet_ntop");

647

739

} else {

648

740

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

649

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

741

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

650

742

}

651

743

}

652

744

}

653

745

654

746

if(quit_now){

747

errno = EINTR;

655

748

goto mandos_end;

656

749

}

657

750

661

754

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

662

755

}

663

756

if(ret < 0){

664

perror("connect");

665

retval = -1;

757

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

758

int e = errno;

759

perror_plus("connect");

760

errno = e;

761

}

666

762

goto mandos_end;

667

763

}

668

764

669

765

if(quit_now){

766

errno = EINTR;

670

767

goto mandos_end;

671

768

}

672

769

675

772

while(true){

676

773

size_t out_size = strlen(out);

677

774

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

678

out_size - written));

775

out_size - written));

679

776

if(ret == -1){

680

perror("write");

681

retval = -1;

777

int e = errno;

778

perror_plus("write");

779

errno = e;

682

780

goto mandos_end;

683

781

}

684

782

written += (size_t)ret;

694

792

}

695

793

696

794

if(quit_now){

795

errno = EINTR;

697

796

goto mandos_end;

698

797

}

699

798

}

700

799

701

800

if(debug){

702

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

801

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

703

802

}

704

803

705

804

if(quit_now){

805

errno = EINTR;

706

806

goto mandos_end;

707

807

}

708

808

809

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

709

810

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

710

811

711

812

if(quit_now){

813

errno = EINTR;

712

814

goto mandos_end;

713

815

}

714

816

715

do{

817

do {

716

818

ret = gnutls_handshake(session);

717

819

if(quit_now){

820

errno = EINTR;

718

821

goto mandos_end;

719

822

}

720

823

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

721

824

722

825

if(ret != GNUTLS_E_SUCCESS){

723

826

if(debug){

724

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

827

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

725

828

gnutls_perror(ret);

726

829

}

727

retval = -1;

830

errno = EPROTO;

728

831

goto mandos_end;

729

832

}

730

833

731

834

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

732

835

733

836

if(debug){

734

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

735

ip);

837

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

736

838

}

737

839

738

840

while(true){

739

841

740

842

if(quit_now){

843

errno = EINTR;

741

844

goto mandos_end;

742

845

}

743

846

744

847

buffer_capacity = incbuffer(&buffer, buffer_length,

745

buffer_capacity);

848

buffer_capacity);

746

849

if(buffer_capacity == 0){

747

perror("incbuffer");

748

retval = -1;

850

int e = errno;

851

perror_plus("incbuffer");

852

errno = e;

749

853

goto mandos_end;

750

854

}

751

855

752

856

if(quit_now){

857

errno = EINTR;

753

858

goto mandos_end;

754

859

}

755

860

764

869

case GNUTLS_E_AGAIN:

765

870

break;

766

871

case GNUTLS_E_REHANDSHAKE:

767

do{

872

do {

768

873

ret = gnutls_handshake(session);

769

874

770

875

if(quit_now){

876

errno = EINTR;

771

877

goto mandos_end;

772

878

}

773

879

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

774

880

if(ret < 0){

775

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

881

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

776

882

gnutls_perror(ret);

777

retval = -1;

883

errno = EPROTO;

778

884

goto mandos_end;

779

885

}

780

886

break;

781

887

default:

782

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

888

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

783

889

" encrypted session with Mandos server\n");

784

retval = -1;

785

890

gnutls_bye(session, GNUTLS_SHUT_RDWR);

891

errno = EIO;

786

892

goto mandos_end;

787

893

}

788

894

} else {

791

897

}

792

898

793

899

if(debug){

794

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

795

}

796

797

if(quit_now){

798

goto mandos_end;

799

}

800

801

gnutls_bye(session, GNUTLS_SHUT_RDWR);

802

803

if(quit_now){

804

goto mandos_end;

805

}

900

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

901

}

902

903

if(quit_now){

904

errno = EINTR;

905

goto mandos_end;

906

}

907

908

do {

909

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

910

if(quit_now){

911

errno = EINTR;

912

goto mandos_end;

913

}

914

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

806

915

807

916

if(buffer_length > 0){

808

decrypted_buffer_size = pgp_packet_decrypt(buffer,

809

buffer_length,

917

ssize_t decrypted_buffer_size;

918

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

810

919

&decrypted_buffer);

811

920

if(decrypted_buffer_size >= 0){

921

812

922

written = 0;

813

923

while(written < (size_t) decrypted_buffer_size){

814

924

if(quit_now){

925

errno = EINTR;

815

926

goto mandos_end;

816

927

}

817

928

819

930

(size_t)decrypted_buffer_size - written,

820

931

stdout);

821

932

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

933

int e = errno;

822

934

if(debug){

823

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

935

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

824

936

strerror(errno));

825

937

}

826

retval = -1;

827

break;

938

errno = e;

939

goto mandos_end;

828

940

}

829

941

written += (size_t)ret;

830

942

}

831

free(decrypted_buffer);

832

} else {

833

retval = -1;

943

retval = 0;

834

944

}

835

} else {

836

retval = -1;

837

945

}

838

946

839

947

/* Shutdown procedure */

840

948

841

949

mandos_end:

842

free(buffer);

843

if(tcp_sd >= 0){

844

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

845

}

846

if(ret == -1){

847

perror("close");

848

}

849

gnutls_deinit(session);

850

if(quit_now){

851

retval = -1;

950

{

951

int e = errno;

952

free(decrypted_buffer);

953

free(buffer);

954

if(tcp_sd >= 0){

955

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

956

}

957

if(ret == -1){

958

if(e == 0){

959

e = errno;

960

}

961

perror_plus("close");

962

}

963

gnutls_deinit(session);

964

errno = e;

965

if(quit_now){

966

errno = EINTR;

967

retval = -1;

968

}

852

969

}

853

970

return retval;

854

971

}

879

996

switch(event){

880

997

default:

881

998

case AVAHI_RESOLVER_FAILURE:

882

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

999

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

883

1000

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

884

1001

avahi_strerror(avahi_server_errno(mc.server)));

885

1002

break;

889

1006

char ip[AVAHI_ADDRESS_STR_MAX];

890

1007

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

891

1008

if(debug){

892

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

1009

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

893

1010

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

894

1011

ip, (intmax_t)interface, port);

895

1012

}

897

1014

avahi_proto_to_af(proto));

898

1015

if(ret == 0){

899

1016

avahi_simple_poll_quit(mc.simple_poll);

1017

} else {

1018

ret = add_server(ip, port, interface,

1019

avahi_proto_to_af(proto));

900

1020

}

901

1021

}

902

1022

}

926

1046

default:

927

1047

case AVAHI_BROWSER_FAILURE:

928

1048

929

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

1049

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

930

1050

avahi_strerror(avahi_server_errno(mc.server)));

931

1051

avahi_simple_poll_quit(mc.simple_poll);

932

1052

return;

940

1060

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

941

1061

name, type, domain, protocol, 0,

942

1062

resolve_callback, NULL) == NULL)

943

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

1063

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

944

1064

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

945

1065

break;

946

1066

950

1070

case AVAHI_BROWSER_ALL_FOR_NOW:

951

1071

case AVAHI_BROWSER_CACHE_EXHAUSTED:

952

1072

if(debug){

953

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

1073

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

954

1074

}

955

1075

break;

956

1076

}

957

1077

}

958

1078

959

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

1079

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

960

1080

static void handle_sigterm(int sig){

961

1081

if(quit_now){

962

1082

return;

964

1084

quit_now = 1;

965

1085

signal_received = sig;

966

1086

int old_errno = errno;

1087

/* set main loop to exit */

967

1088

if(mc.simple_poll != NULL){

968

1089

avahi_simple_poll_quit(mc.simple_poll);

969

1090

}

970

1091

errno = old_errno;

971

1092

}

972

1093

1094

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

1095

int ret;

1096

1097

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

1098

if(s < 0){

1099

perror_plus("socket");

1100

return false;

1101

}

1102

strcpy(ifr->ifr_name, ifname);

1103

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1104

if(ret == -1){

1105

if(debug){

1106

perror_plus("ioctl SIOCGIFFLAGS");

1107

}

1108

return false;

1109

}

1110

return true;

1111

}

1112

1113

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

1114

1115

/* Reject the loopback device */

1116

if(ifr->ifr_flags & IFF_LOOPBACK){

1117

if(debug){

1118

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

1119

}

1120

return false;

1121

}

1122

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

1123

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

1124

if(debug){

1125

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

1126

}

1127

return true;

1128

}

1129

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

1130

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

1131

if(debug){

1132

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

1133

}

1134

return false;

1135

}

1136

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

1137

if(ifr->ifr_flags & IFF_NOARP){

1138

if(debug){

1139

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

1140

}

1141

return false;

1142

}

1143

1144

/* Accept this device */

1145

if(debug){

1146

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

1147

}

1148

return true;

1149

}

1150

1151

/*

1152

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

1153

* corresponds to an acceptable network device.

1154

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

1155

*/

1156

int good_interface(const struct dirent *if_entry){

1157

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

1158

return 0;

1159

}

1160

1161

struct ifreq ifr;

1162

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

1163

if(debug){

1164

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

1165

if_entry->d_name);

1166

}

1167

return 0;

1168

}

1169

1170

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

1171

return 0;

1172

}

1173

return 1;

1174

}

1175

1176

/*

1177

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

1178

* corresponds to an acceptable network device which is up.

1179

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

1180

*/

1181

int up_interface(const struct dirent *if_entry){

1182

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

1183

return 0;

1184

}

1185

1186

struct ifreq ifr;

1187

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

1188

if(debug){

1189

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

1190

if_entry->d_name);

1191

}

1192

return 0;

1193

}

1194

1195

/* Reject down interfaces */

1196

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

1197

if(debug){

1198

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

1199

if_entry->d_name);

1200

}

1201

return 0;

1202

}

1203

1204

/* Reject non-running interfaces */

1205

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

1206

if(debug){

1207

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

1208

if_entry->d_name);

1209

}

1210

return 0;

1211

}

1212

1213

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

1214

return 0;

1215

}

1216

return 1;

1217

}

1218

1219

int notdotentries(const struct dirent *direntry){

1220

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

1221

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

1222

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

1223

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

1224

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

1225

return 0;

1226

}

1227

return 1;

1228

}

1229

1230

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

1231

int runnable_hook(const struct dirent *direntry){

1232

int ret;

1233

size_t sret;

1234

struct stat st;

1235

1236

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

1237

/* Empty name? */

1238

return 0;

1239

}

1240

1241

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

1242

"abcdefghijklmnopqrstuvwxyz"

1243

"0123456789"

1244

"_-");

1245

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

1246

/* Contains non-allowed characters */

1247

if(debug){

1248

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

1249

direntry->d_name);

1250

}

1251

return 0;

1252

}

1253

1254

char *fullname = NULL;

1255

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

1256

if(ret < 0){

1257

perror_plus("asprintf");

1258

return 0;

1259

}

1260

1261

ret = stat(fullname, &st);

1262

if(ret == -1){

1263

if(debug){

1264

perror_plus("Could not stat hook");

1265

}

1266

return 0;

1267

}

1268

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

1269

/* Not a regular file */

1270

if(debug){

1271

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

1272

direntry->d_name);

1273

}

1274

return 0;

1275

}

1276

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

1277

/* Not executable */

1278

if(debug){

1279

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

1280

direntry->d_name);

1281

}

1282

return 0;

1283

}

1284

return 1;

1285

}

1286

1287

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1288

int ret;

1289

struct timespec now;

1290

struct timespec waited_time;

1291

intmax_t block_time;

1292

1293

while(true){

1294

if(mc.current_server == NULL){

1295

if (debug){

1296

fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");

1297

}

1298

ret = avahi_simple_poll_iterate(s, -1);

1299

} else {

1300

if (debug){

1301

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

1302

" or wait\n");

1303

}

1304

/* the current time */

1305

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1306

if(ret == -1){

1307

perror_plus("clock_gettime");

1308

return -1;

1309

}

1310

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

1311

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

1312

waited_time.tv_sec = (now.tv_sec

1313

- mc.current_server->last_seen.tv_sec);

1314

waited_time.tv_nsec = (now.tv_nsec

1315

- mc.current_server->last_seen.tv_nsec);

1316

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

1317

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

1318

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

1319

block_time = ((retry_interval

1320

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

1321

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

1322

1323

if (debug){

1324

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

1325

}

1326

1327

if(block_time <= 0){

1328

ret = start_mandos_communication(mc.current_server->ip,

1329

mc.current_server->port,

1330

mc.current_server->if_index,

1331

mc.current_server->af);

1332

if(ret == 0){

1333

avahi_simple_poll_quit(mc.simple_poll);

1334

return 0;

1335

}

1336

ret = clock_gettime(CLOCK_MONOTONIC,

1337

&mc.current_server->last_seen);

1338

if(ret == -1){

1339

perror_plus("clock_gettime");

1340

return -1;

1341

}

1342

mc.current_server = mc.current_server->next;

1343

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

1344

servers, but don't block */

1345

}

1346

1347

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

1348

}

1349

if(ret != 0){

1350

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

1351

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

1352

}

1353

}

1354

}

1355

}

1356

973

1357

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

974

1358

AvahiSServiceBrowser *sb = NULL;

975

1359

int error;

977

1361

intmax_t tmpmax;

978

1362

char *tmp;

979

1363

int exitcode = EXIT_SUCCESS;

980

const char *interface = "eth0";

1364

const char *interface = "";

981

1365

struct ifreq network;

982

1366

int sd = -1;

983

1367

bool take_down_interface = false;

984

1368

uid_t uid;

985

1369

gid_t gid;

986

char *connect_to = NULL;

987

1370

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

988

1371

bool tempdir_created = false;

989

1372

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

993

1376

bool gnutls_initialized = false;

994

1377

bool gpgme_initialized = false;

995

1378

float delay = 2.5f;

1379

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

1380

retrying the same server again */

996

1381

997

struct sigaction old_sigterm_action;

1382

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

998

1383

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

999

1384

1385

uid = getuid();

1386

gid = getgid();

1387

1388

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

1389

errno = 0;

1390

ret = setgid(gid);

1391

if(ret == -1){

1392

perror_plus("setgid");

1393

}

1394

1395

/* Lower user privileges (temporarily) */

1396

errno = 0;

1397

ret = seteuid(uid);

1398

if(ret == -1){

1399

perror_plus("seteuid");

1400

}

1401

1402

if(quit_now){

1403

goto end;

1404

}

1405

1000

1406

{

1001

1407

struct argp_option options[] = {

1002

1408

{ .name = "debug", .key = 128,

1031

1437

.arg = "SECONDS",

1032

1438

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

1033

1439

.group = 2 },

1440

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

1441

.arg = "SECONDS",

1442

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

1443

.group = 2 },

1444

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

1445

.arg = "DIR",

1446

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

1447

.group = 2 },

1448

/*

1449

* These reproduce what we would get without ARGP_NO_HELP

1450

*/

1451

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

1452

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

1453

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

1454

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

1455

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

1456

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

1034

1457

{ .name = NULL }

1035

1458

};

1036

1459

1037

1460

error_t parse_opt(int key, char *arg,

1038

1461

struct argp_state *state){

1462

errno = 0;

1039

1463

switch(key){

1040

1464

case 128: /* --debug */

1041

1465

debug = true;

1057

1481

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

1058

1482

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

1059

1483

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

1060

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

1061

exit(EXIT_FAILURE);

1484

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

1062

1485

}

1063

1486

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

1064

1487

break;

1069

1492

errno = 0;

1070

1493

delay = strtof(arg, &tmp);

1071

1494

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

1072

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

1073

exit(EXIT_FAILURE);

1074

}

1075

break;

1076

case ARGP_KEY_ARG:

1077

argp_usage(state);

1078

case ARGP_KEY_END:

1495

argp_error(state, "Bad delay");

1496

}

1497

case 132: /* --retry */

1498

errno = 0;

1499

retry_interval = strtod(arg, &tmp);

1500

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

1501

or (retry_interval * 1000) > INT_MAX

1502

or retry_interval < 0){

1503

argp_error(state, "Bad retry interval");

1504

}

1505

break;

1506

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

1507

hookdir = arg;

1508

break;

1509

/*

1510

* These reproduce what we would get without ARGP_NO_HELP

1511

*/

1512

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

1513

argp_state_help(state, state->out_stream,

1514

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1515

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1516

case -3: /* --usage */

1517

argp_state_help(state, state->out_stream,

1518

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1519

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

1520

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

1521

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

1522

exit(argp_err_exit_status);

1079

1523

break;

1080

1524

default:

1081

1525

return ARGP_ERR_UNKNOWN;

1082

1526

}

1083

return 0;

1527

return errno;

1084

1528

}

1085

1529

1086

1530

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

1087

1531

.args_doc = "",

1088

1532

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

1089

1533

" passwords from a Mandos server" };

1090

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

1091

if(ret == ARGP_ERR_UNKNOWN){

1092

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

1093

exitcode = EXIT_FAILURE;

1094

goto end;

1534

ret = argp_parse(&argp, argc, argv,

1535

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1536

switch(ret){

1537

case 0:

1538

break;

1539

case ENOMEM:

1540

default:

1541

errno = ret;

1542

perror_plus("argp_parse");

1543

exitcode = EX_OSERR;

1544

goto end;

1545

case EINVAL:

1546

exitcode = EX_USAGE;

1547

goto end;

1548

}

1549

}

1550

1551

{

1552

/* Work around Debian bug #633582:

1553

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

1554

struct stat st;

1555

1556

/* Re-raise priviliges */

1557

errno = 0;

1558

ret = seteuid(0);

1559

if(ret == -1){

1560

perror_plus("seteuid");

1561

}

1562

1563

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

1564

int seckey_fd = open(seckey, O_RDONLY);

1565

if(seckey_fd == -1){

1566

perror_plus("open");

1567

} else {

1568

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

1569

if(ret == -1){

1570

perror_plus("fstat");

1571

} else {

1572

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

1573

ret = fchown(seckey_fd, uid, gid);

1574

if(ret == -1){

1575

perror_plus("fchown");

1576

}

1577

}

1578

}

1579

TEMP_FAILURE_RETRY(close(seckey_fd));

1580

}

1581

}

1582

1583

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

1584

int pubkey_fd = open(pubkey, O_RDONLY);

1585

if(pubkey_fd == -1){

1586

perror_plus("open");

1587

} else {

1588

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

1589

if(ret == -1){

1590

perror_plus("fstat");

1591

} else {

1592

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

1593

ret = fchown(pubkey_fd, uid, gid);

1594

if(ret == -1){

1595

perror_plus("fchown");

1596

}

1597

}

1598

}

1599

TEMP_FAILURE_RETRY(close(pubkey_fd));

1600

}

1601

}

1602

1603

/* Lower privileges */

1604

errno = 0;

1605

ret = seteuid(uid);

1606

if(ret == -1){

1607

perror_plus("seteuid");

1608

}

1609

}

1610

1611

/* Find network hooks and run them */

1612

{

1613

struct dirent **direntries;

1614

struct dirent *direntry;

1615

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

1616

alphasort);

1617

if(numhooks == -1){

1618

perror_plus("scandir");

1619

} else {

1620

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

1621

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

1622

direntry = direntries[0];

1623

char *fullname = NULL;

1624

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

1625

if(ret < 0){

1626

perror_plus("asprintf");

1627

continue;

1628

}

1629

pid_t hook_pid = fork();

1630

if(hook_pid == 0){

1631

/* Child */

1632

dup2(devnull, STDIN_FILENO);

1633

close(devnull);

1634

dup2(STDERR_FILENO, STDOUT_FILENO);

1635

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

1636

if(ret == -1){

1637

perror_plus("setenv");

1638

exit(1);

1639

}

1640

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

1641

if(ret == -1){

1642

perror_plus("setenv");

1643

exit(1);

1644

}

1645

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

1646

if(ret == -1){

1647

perror_plus("setenv");

1648

exit(1);

1649

}

1650

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

1651

if(ret == -1){

1652

perror_plus("setenv");

1653

exit(1);

1654

}

1655

char *delaystring;

1656

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

1657

if(ret == -1){

1658

perror_plus("asprintf");

1659

exit(1);

1660

}

1661

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

1662

if(ret == -1){

1663

free(delaystring);

1664

perror_plus("setenv");

1665

exit(1);

1666

}

1667

free(delaystring);

1668

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

1669

perror_plus("execl");

1670

} else {

1671

int status;

1672

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

1673

perror_plus("waitpid");

1674

free(fullname);

1675

continue;

1676

}

1677

if(WIFEXITED(status)){

1678

if(WEXITSTATUS(status) != 0){

1679

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

1680

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

1681

WEXITSTATUS(status));

1682

free(fullname);

1683

continue;

1684

}

1685

} else if(WIFSIGNALED(status)){

1686

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

1687

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

1688

WTERMSIG(status));

1689

free(fullname);

1690

continue;

1691

} else {

1692

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

1693

direntry->d_name);

1694

free(fullname);

1695

continue;

1696

}

1697

}

1698

free(fullname);

1699

if(quit_now){

1700

goto end;

1701

}

1702

}

1703

close(devnull);

1095

1704

}

1096

1705

}

1097

1706

1099

1708

avahi_set_log_function(empty_log);

1100

1709

}

1101

1710

1711

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

1712

struct dirent **direntries;

1713

/* First look for interfaces that are up */

1714

ret = scandir(sys_class_net, &direntries, up_interface,

1715

alphasort);

1716

if(ret == 0){

1717

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

1718

free(direntries);

1719

ret = scandir(sys_class_net, &direntries, good_interface,

1720

alphasort);

1721

}

1722

if(ret >= 1){

1723

/* Pick the first interface returned */

1724

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

1725

if(debug){

1726

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

1727

}

1728

if(interface == NULL){

1729

perror_plus("malloc");

1730

free(direntries);

1731

exitcode = EXIT_FAILURE;

1732

goto end;

1733

}

1734

free(direntries);

1735

} else {

1736

free(direntries);

1737

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

1738

exitcode = EXIT_FAILURE;

1739

goto end;

1740

}

1741

}

1742

1102

1743

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

1103

1744

from the signal handler */

1104

1745

/* Initialize the pseudo-RNG for Avahi */

1105

1746

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

1106

1747

mc.simple_poll = avahi_simple_poll_new();

1107

1748

if(mc.simple_poll == NULL){

1108

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

1109

exitcode = EXIT_FAILURE;

1749

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

1750

exitcode = EX_UNAVAILABLE;

1110

1751

goto end;

1111

1752

}

1112

1753

1113

1754

sigemptyset(&sigterm_action.sa_mask);

1114

1755

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

1115

1756

if(ret == -1){

1116

perror("sigaddset");

1117

exitcode = EXIT_FAILURE;

1757

perror_plus("sigaddset");

1758

exitcode = EX_OSERR;

1118

1759

goto end;

1119

1760

}

1120

1761

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

1121

1762

if(ret == -1){

1122

perror("sigaddset");

1123

exitcode = EXIT_FAILURE;

1763

perror_plus("sigaddset");

1764

exitcode = EX_OSERR;

1124

1765

goto end;

1125

1766

}

1126

1767

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

1127

1768

if(ret == -1){

1128

perror("sigaddset");

1129

exitcode = EXIT_FAILURE;

1769

perror_plus("sigaddset");

1770

exitcode = EX_OSERR;

1130

1771

goto end;

1131

1772

}

1132

1773

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

1135

1776

*/

1136

1777

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

1137

1778

if(ret == -1){

1138

perror("sigaction");

1139

return EXIT_FAILURE;

1779

perror_plus("sigaction");

1780

return EX_OSERR;

1140

1781

}

1141

1782

if(old_sigterm_action.sa_handler != SIG_IGN){

1142

1783

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

1143

1784

if(ret == -1){

1144

perror("sigaction");

1145

exitcode = EXIT_FAILURE;

1785

perror_plus("sigaction");

1786

exitcode = EX_OSERR;

1146

1787

goto end;

1147

1788

}

1148

1789

}

1149

1790

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

1150

1791

if(ret == -1){

1151

perror("sigaction");

1152

return EXIT_FAILURE;

1792

perror_plus("sigaction");

1793

return EX_OSERR;

1153

1794

}

1154

1795

if(old_sigterm_action.sa_handler != SIG_IGN){

1155

1796

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

1156

1797

if(ret == -1){

1157

perror("sigaction");

1158

exitcode = EXIT_FAILURE;

1798

perror_plus("sigaction");

1799

exitcode = EX_OSERR;

1159

1800

goto end;

1160

1801

}

1161

1802

}

1162

1803

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

1163

1804

if(ret == -1){

1164

perror("sigaction");

1165

return EXIT_FAILURE;

1805

perror_plus("sigaction");

1806

return EX_OSERR;

1166

1807

}

1167

1808

if(old_sigterm_action.sa_handler != SIG_IGN){

1168

1809

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

1169

1810

if(ret == -1){

1170

perror("sigaction");

1171

exitcode = EXIT_FAILURE;

1811

perror_plus("sigaction");

1812

exitcode = EX_OSERR;

1172

1813

goto end;

1173

1814

}

1174

1815

}

1175

1816

1176

1817

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

1177

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

1818

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

1178

1819

if_index = (AvahiIfIndex) if_nametoindex(interface);

1179

1820

if(if_index == 0){

1180

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

1181

exitcode = EXIT_FAILURE;

1821

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

1822

exitcode = EX_UNAVAILABLE;

1182

1823

goto end;

1183

1824

}

1184

1825

1186

1827

goto end;

1187

1828

}

1188

1829

1830

/* Re-raise priviliges */

1831

errno = 0;

1832

ret = seteuid(0);

1833

if(ret == -1){

1834

perror_plus("seteuid");

1835

}

1836

1189

1837

#ifdef __linux__

1190

1838

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1191

messages to mess up the prompt */

1839

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

1192

1840

ret = klogctl(8, NULL, 5);

1193

1841

bool restore_loglevel = true;

1194

1842

if(ret == -1){

1195

1843

restore_loglevel = false;

1196

perror("klogctl");

1844

perror_plus("klogctl");

1197

1845

}

1198

1846

#endif /* __linux__ */

1199

1847

1200

1848

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1201

1849

if(sd < 0){

1202

perror("socket");

1203

exitcode = EXIT_FAILURE;

1850

perror_plus("socket");

1851

exitcode = EX_OSERR;

1204

1852

#ifdef __linux__

1205

1853

if(restore_loglevel){

1206

1854

ret = klogctl(7, NULL, 0);

1207

1855

if(ret == -1){

1208

perror("klogctl");

1856

perror_plus("klogctl");

1209

1857

}

1210

1858

}

1211

1859

#endif /* __linux__ */

1860

/* Lower privileges */

1861

errno = 0;

1862

ret = seteuid(uid);

1863

if(ret == -1){

1864

perror_plus("seteuid");

1865

}

1212

1866

goto end;

1213

1867

}

1214

1868

strcpy(network.ifr_name, interface);

1215

1869

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

1216

1870

if(ret == -1){

1217

perror("ioctl SIOCGIFFLAGS");

1871

perror_plus("ioctl SIOCGIFFLAGS");

1218

1872

#ifdef __linux__

1219

1873

if(restore_loglevel){

1220

1874

ret = klogctl(7, NULL, 0);

1221

1875

if(ret == -1){

1222

perror("klogctl");

1876

perror_plus("klogctl");

1223

1877

}

1224

1878

}

1225

1879

#endif /* __linux__ */

1226

exitcode = EXIT_FAILURE;

1880

exitcode = EX_OSERR;

1881

/* Lower privileges */

1882

errno = 0;

1883

ret = seteuid(uid);

1884

if(ret == -1){

1885

perror_plus("seteuid");

1886

}

1227

1887

goto end;

1228

1888

}

1229

1889

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

1232

1892

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

1233

1893

if(ret == -1){

1234

1894

take_down_interface = false;

1235

perror("ioctl SIOCSIFFLAGS");

1236

exitcode = EXIT_FAILURE;

1895

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1896

exitcode = EX_OSERR;

1237

1897

#ifdef __linux__

1238

1898

if(restore_loglevel){

1239

1899

ret = klogctl(7, NULL, 0);

1240

1900

if(ret == -1){

1241

perror("klogctl");

1901

perror_plus("klogctl");

1242

1902

}

1243

1903

}

1244

1904

#endif /* __linux__ */

1905

/* Lower privileges */

1906

errno = 0;

1907

ret = seteuid(uid);

1908

if(ret == -1){

1909

perror_plus("seteuid");

1910

}

1245

1911

goto end;

1246

1912

}

1247

1913

}

1248

/* sleep checking until interface is running */

1914

/* Sleep checking until interface is running.

1915

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

1249

1916

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

1250

1917

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

1251

1918

if(ret == -1){

1252

perror("ioctl SIOCGIFFLAGS");

1919

perror_plus("ioctl SIOCGIFFLAGS");

1253

1920

} else if(network.ifr_flags & IFF_RUNNING){

1254

1921

break;

1255

1922

}

1256

1923

struct timespec sleeptime = { .tv_nsec = 250000000 };

1257

1924

ret = nanosleep(&sleeptime, NULL);

1258

1925

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

1259

perror("nanosleep");

1926

perror_plus("nanosleep");

1260

1927

}

1261

1928

}

1262

1929

if(not take_down_interface){

1263

1930

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

1264

1931

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

1265

1932

if(ret == -1){

1266

perror("close");

1933

perror_plus("close");

1267

1934

}

1268

1935

}

1269

1936

#ifdef __linux__

1271

1938

/* Restores kernel loglevel to default */

1272

1939

ret = klogctl(7, NULL, 0);

1273

1940

if(ret == -1){

1274

perror("klogctl");

1941

perror_plus("klogctl");

1275

1942

}

1276

1943

}

1277

1944

#endif /* __linux__ */

1278

}

1279

1280

if(quit_now){

1281

goto end;

1282

}

1283

1284

uid = getuid();

1285

gid = getgid();

1286

1287

errno = 0;

1288

setgid(gid);

1289

if(ret == -1){

1290

perror("setgid");

1291

}

1292

1293

ret = setuid(uid);

1294

if(ret == -1){

1295

perror("setuid");

1945

/* Lower privileges */

1946

errno = 0;

1947

if(take_down_interface){

1948

/* Lower privileges */

1949

ret = seteuid(uid);

1950

if(ret == -1){

1951

perror_plus("seteuid");

1952

}

1953

} else {

1954

/* Lower privileges permanently */

1955

ret = setuid(uid);

1956

if(ret == -1){

1957

perror_plus("setuid");

1958

}

1959

}

1296

1960

}

1297

1961

1298

1962

if(quit_now){

1301

1965

1302

1966

ret = init_gnutls_global(pubkey, seckey);

1303

1967

if(ret == -1){

1304

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

1305

exitcode = EXIT_FAILURE;

1968

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

1969

exitcode = EX_UNAVAILABLE;

1306

1970

goto end;

1307

1971

} else {

1308

1972

gnutls_initialized = true;

1312

1976

goto end;

1313

1977

}

1314

1978

1979

if(mkdtemp(tempdir) == NULL){

1980

perror_plus("mkdtemp");

1981

goto end;

1982

}

1315

1983

tempdir_created = true;

1316

if(mkdtemp(tempdir) == NULL){

1317

tempdir_created = false;

1318

perror("mkdtemp");

1319

goto end;

1320

}

1321

1984

1322

1985

if(quit_now){

1323

1986

goto end;

1324

1987

}

1325

1988

1326

1989

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

1327

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

1328

exitcode = EXIT_FAILURE;

1990

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

1991

exitcode = EX_UNAVAILABLE;

1329

1992

goto end;

1330

1993

} else {

1331

1994

gpgme_initialized = true;

1340

2003

/* (Mainly meant for debugging) */

1341

2004

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

1342

2005

if(address == NULL){

1343

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

1344

exitcode = EXIT_FAILURE;

2006

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

2007

exitcode = EX_USAGE;

1345

2008

goto end;

1346

2009

}

1347

2010

1354

2017

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

1355

2018

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

1356

2019

or tmpmax != (uint16_t)tmpmax){

1357

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

1358

exitcode = EXIT_FAILURE;

2020

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

2021

exitcode = EX_USAGE;

1359

2022

goto end;

1360

2023

}

1361

2024

1365

2028

1366

2029

port = (uint16_t)tmpmax;

1367

2030

*address = '\0';

1368

address = connect_to;

1369

2031

/* Colon in address indicates IPv6 */

1370

2032

int af;

1371

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

2033

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

1372

2034

af = AF_INET6;

2035

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

2036

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

2037

{

2038

connect_to++;

2039

address[-1] = '\0';

2040

}

1373

2041

} else {

1374

2042

af = AF_INET;

1375

2043

}

2044

address = connect_to;

1376

2045

1377

2046

if(quit_now){

1378

2047

goto end;

1379

2048

}

1380

2049

1381

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

1382

if(ret < 0){

1383

exitcode = EXIT_FAILURE;

1384

} else {

2050

while(not quit_now){

2051

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

2052

if(quit_now or ret == 0){

2053

break;

2054

}

2055

if(debug){

2056

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

2057

}

2058

sleep((int)retry_interval);

2059

}

2060

2061

if (not quit_now){

1385

2062

exitcode = EXIT_SUCCESS;

1386

2063

}

2064

1387

2065

goto end;

1388

2066

}

1389

2067

1411

2089

1412

2090

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

1413

2091

if(mc.server == NULL){

1414

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

2092

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

1415

2093

avahi_strerror(error));

1416

exitcode = EXIT_FAILURE;

2094

exitcode = EX_UNAVAILABLE;

1417

2095

goto end;

1418

2096

}

1419

2097

1426

2104

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1427

2105

NULL, 0, browse_callback, NULL);

1428

2106

if(sb == NULL){

1429

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

2107

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

1430

2108

avahi_strerror(avahi_server_errno(mc.server)));

1431

exitcode = EXIT_FAILURE;

2109

exitcode = EX_UNAVAILABLE;

1432

2110

goto end;

1433

2111

}

1434

2112

1439

2117

/* Run the main loop */

1440

2118

1441

2119

if(debug){

1442

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

1443

}

1444

1445

avahi_simple_poll_loop(mc.simple_poll);

2120

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

2121

}

2122

2123

ret = avahi_loop_with_timeout(mc.simple_poll,

2124

(int)(retry_interval * 1000));

2125

if(debug){

2126

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

2127

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

2128

}

1446

2129

1447

2130

end:

1448

2131

1449

2132

if(debug){

1450

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

2133

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

1451

2134

}

1452

2135

1453

2136

/* Cleanup things */

1469

2152

if(gpgme_initialized){

1470

2153

gpgme_release(mc.ctx);

1471

2154

}

2155

2156

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

2157

has seen */

2158

if(mc.current_server != NULL){

2159

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

2160

while(mc.current_server != NULL){

2161

server *next = mc.current_server->next;

2162

free(mc.current_server);

2163

mc.current_server = next;

2164

}

2165

}

2166

2167

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

1472

2168

1473

2169

/* Take down the network interface */

1474

2170

if(take_down_interface){

1475

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

2171

/* Re-raise priviliges */

2172

errno = 0;

2173

ret = seteuid(0);

1476

2174

if(ret == -1){

1477

perror("ioctl SIOCGIFFLAGS");

1478

} else if(network.ifr_flags & IFF_UP) {

1479

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

1480

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

1481

if(ret == -1){

1482

perror("ioctl SIOCSIFFLAGS");

1483

}

2175

perror_plus("seteuid");

1484

2176

}

1485

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

1486

if(ret == -1){

1487

perror("close");

2177

if(geteuid() == 0){

2178

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

2179

if(ret == -1){

2180

perror_plus("ioctl SIOCGIFFLAGS");

2181

} else if(network.ifr_flags & IFF_UP){

2182

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

2183

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

2184

if(ret == -1){

2185

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2186

}

2187

}

2188

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

2189

if(ret == -1){

2190

perror_plus("close");

2191

}

2192

/* Lower privileges permanently */

2193

errno = 0;

2194

ret = setuid(uid);

2195

if(ret == -1){

2196

perror_plus("setuid");

2197

}

1488

2198

}

1489

2199

}

1490

2200

1491

/* Removes the temp directory used by GPGME */

2201

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

1492

2202

if(tempdir_created){

1493

DIR *d;

1494

struct dirent *direntry;

1495

d = opendir(tempdir);

1496

if(d == NULL){

1497

if(errno != ENOENT){

1498

perror("opendir");

1499

}

1500

} else {

1501

while(true){

1502

direntry = readdir(d);

1503

if(direntry == NULL){

1504

break;

1505

}

1506

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

1507

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

1508

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

1509

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

1510

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

1511

continue;

1512

}

2203

struct dirent **direntries = NULL;

2204

struct dirent *direntry = NULL;

2205

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

2206

alphasort);

2207

if (numentries > 0){

2208

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

2209

direntry = direntries[i];

1513

2210

char *fullname = NULL;

1514

2211

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

1515

2212

direntry->d_name);

1516

2213

if(ret < 0){

1517

perror("asprintf");

2214

perror_plus("asprintf");

1518

2215

continue;

1519

2216

}

1520

2217

ret = remove(fullname);

1521

2218

if(ret == -1){

1522

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

1523

strerror(errno));

2219

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

1524

2220

}

1525

2221

free(fullname);

1526

2222

}

1527

closedir(d);

2223

}

2224

2225

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

2226

free(direntries);

2227

if (numentries == -1){

2228

perror_plus("scandir");

1528

2229

}

1529

2230

ret = rmdir(tempdir);

1530

2231

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

1531

perror("rmdir");

2232

perror_plus("rmdir");

1532

2233

}

1533

2234

}

1534

2235

1535

2236

if(quit_now){

1536

2237

sigemptyset(&old_sigterm_action.sa_mask);

1537

2238

old_sigterm_action.sa_handler = SIG_DFL;

1538

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

2239

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2240

&old_sigterm_action,

2241

NULL));

1539

2242

if(ret == -1){

1540

perror("sigaction");

1541

}

1542

raise(signal_received);

2243

perror_plus("sigaction");

2244

}

2245

do {

2246

ret = raise(signal_received);

2247

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

2248

if(ret != 0){

2249

perror_plus("raise");

2250

abort();

2251

}

2252

TEMP_FAILURE_RETRY(pause());

1543

2253

}

1544

2254

1545

2255

return exitcode;