/mandos/release : revision 237.7.145

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

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*

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* Everything else is

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*

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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>.

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*/

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

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

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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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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*/

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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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65

program_invocation_short_name */

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

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*/

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73

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

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

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setgid(), pause() */

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

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

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77

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

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

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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 */

87

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

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WEXITSTATUS(), WTERMSIG() */

89

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

90

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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89

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#ifdef __linux__

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96

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

108

114

init_gnutls_session(),

109

115

GNUTLS_* */

110

116

#include <gnutls/openpgp.h>

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

117

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

113

119

114

120

/* GPGME */

115

121

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

123

129

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

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130

#define SECKEY "seckey.txt"

125

131

#define PUBKEY "pubkey.txt"

132

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

126

133

127

134

bool debug = false;

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135

static const char mandos_protocol_version[] = "1";

129

136

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

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

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

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138

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

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139

char *connect_to = NULL;

140

const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

142

gid_t gid = 65534;

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143

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144

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

135

145

typedef struct server{

136

146

const char *ip;

137

uint16_t port;

147

in_port_t port;

138

148

AvahiIfIndex if_index;

139

149

int af;

140

150

struct timespec last_seen;

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175

166

176

/* Function to use when printing errors */

167

177

void perror_plus(const char *print_text){

178

int e = errno;

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179

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

169

180

program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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184

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

186

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

187

va_list ap;

188

va_start (ap, format);

189

190

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

191

program_invocation_short_name));

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

193

}

194

173

195

/*

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

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197

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

176

198

* "buffer_length" is how much is already used.

177

199

*/

178

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size_t incbuffer(char **buffer, size_t buffer_length,

179

size_t buffer_capacity){

201

size_t buffer_capacity){

180

202

if(buffer_length + BUFFER_SIZE > buffer_capacity){

181

203

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

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204

if(buffer == NULL){

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210

}

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

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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

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int af){

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215

int ret;

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

196

217

if(new_server == NULL){

197

218

perror_plus("malloc");

198

return -1;

219

return false;

199

220

}

200

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

201

.port = port,

202

.if_index = if_index,

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.af = af };

222

.port = port,

223

.if_index = if_index,

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.af = af };

204

225

if(new_server->ip == NULL){

205

226

perror_plus("strdup");

206

return -1;

227

return false;

207

228

}

208

229

/* Special case of first server */

209

230

if (mc.current_server == NULL){

220

241

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

221

242

if(ret == -1){

222

243

perror_plus("clock_gettime");

223

return -1;

244

return false;

224

245

}

225

return 0;

246

return true;

226

247

}

227

248

228

249

/*

229

250

* Initialize GPGME.

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251

*/

231

static bool init_gpgme(const char *seckey,

232

const char *pubkey, const char *tempdir){

252

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

253

const char *tempdir){

233

254

gpgme_error_t rc;

234

255

gpgme_engine_info_t engine_info;

235

256

250

271

251

272

rc = gpgme_data_new_from_fd(&pgp_data, fd);

252

273

if(rc != GPG_ERR_NO_ERROR){

253

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

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gpgme_strsource(rc), gpgme_strerror(rc));

274

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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276

return false;

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277

}

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278

258

279

rc = gpgme_op_import(mc.ctx, pgp_data);

259

280

if(rc != GPG_ERR_NO_ERROR){

260

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

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gpgme_strsource(rc), gpgme_strerror(rc));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

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283

return false;

263

284

}

264

285

271

292

}

272

293

273

294

if(debug){

274

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

295

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

275

296

}

276

297

277

298

/* Init GPGME */

278

299

gpgme_check_version(NULL);

279

300

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

280

301

if(rc != GPG_ERR_NO_ERROR){

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

283

304

return false;

284

305

}

285

306

286

307

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

287

308

rc = gpgme_get_engine_info(&engine_info);

288

309

if(rc != GPG_ERR_NO_ERROR){

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

310

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

311

gpgme_strsource(rc), gpgme_strerror(rc));

291

312

return false;

292

313

}

293

314

while(engine_info != NULL){

299

320

engine_info = engine_info->next;

300

321

}

301

322

if(engine_info == NULL){

302

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

323

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

324

tempdir);

303

325

return false;

304

326

}

305

327

306

328

/* Create new GPGME "context" */

307

329

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

308

330

if(rc != GPG_ERR_NO_ERROR){

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

331

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

332

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

333

gpgme_strerror(rc));

311

334

return false;

312

335

}

313

336

332

355

ssize_t plaintext_length = 0;

333

356

334

357

if(debug){

335

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

358

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

336

359

}

337

360

338

361

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

339

362

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

340

363

0);

341

364

if(rc != GPG_ERR_NO_ERROR){

342

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

343

gpgme_strsource(rc), gpgme_strerror(rc));

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

344

367

return -1;

345

368

}

346

369

347

370

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

348

371

rc = gpgme_data_new(&dh_plain);

349

372

if(rc != GPG_ERR_NO_ERROR){

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

373

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

374

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

375

gpgme_strsource(rc), gpgme_strerror(rc));

352

376

gpgme_data_release(dh_crypto);

353

377

return -1;

354

378

}

357

381

data buffer */

358

382

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

359

383

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

384

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

385

gpgme_strsource(rc), gpgme_strerror(rc));

362

386

plaintext_length = -1;

363

387

if(debug){

364

388

gpgme_decrypt_result_t result;

365

389

result = gpgme_op_decrypt_result(mc.ctx);

366

390

if(result == NULL){

367

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

391

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

368

392

} else {

369

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

370

result->unsupported_algorithm);

371

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

372

result->wrong_key_usage);

393

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

394

result->unsupported_algorithm);

395

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

396

result->wrong_key_usage);

373

397

if(result->file_name != NULL){

374

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

398

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

375

399

}

376

400

gpgme_recipient_t recipient;

377

401

recipient = result->recipients;

378

402

while(recipient != NULL){

379

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

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

383

recipient->status == GPG_ERR_NO_SECKEY

384

? "No" : "Yes");

403

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

404

gpgme_pubkey_algo_name

405

(recipient->pubkey_algo));

406

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

407

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

408

recipient->status == GPG_ERR_NO_SECKEY

409

? "No" : "Yes");

385

410

recipient = recipient->next;

386

411

}

387

412

}

390

415

}

391

416

392

417

if(debug){

393

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

418

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

394

419

}

395

420

396

421

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

403

428

*plaintext = NULL;

404

429

while(true){

405

430

plaintext_capacity = incbuffer(plaintext,

406

(size_t)plaintext_length,

407

plaintext_capacity);

431

(size_t)plaintext_length,

432

plaintext_capacity);

408

433

if(plaintext_capacity == 0){

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

434

perror_plus("incbuffer");

435

plaintext_length = -1;

436

goto decrypt_end;

412

437

}

413

438

414

439

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

427

452

}

428

453

429

454

if(debug){

430

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

455

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

431

456

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

432

457

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

433

458

}

445

470

}

446

471

447

472

static const char * safer_gnutls_strerror(int value){

448

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

449

-Wunreachable-code */

473

const char *ret = gnutls_strerror(value);

450

474

if(ret == NULL)

451

475

ret = "(unknown)";

452

476

return ret;

455

479

/* GnuTLS log function callback */

456

480

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

457

481

const char* string){

458

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

482

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

459

483

}

460

484

461

485

static int init_gnutls_global(const char *pubkeyfilename,

463

487

int ret;

464

488

465

489

if(debug){

466

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

490

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

467

491

}

468

492

469

493

ret = gnutls_global_init();

470

494

if(ret != GNUTLS_E_SUCCESS){

471

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

472

safer_gnutls_strerror(ret));

495

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

496

safer_gnutls_strerror(ret));

473

497

return -1;

474

498

}

475

499

484

508

/* OpenPGP credentials */

485

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

486

510

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

511

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

512

safer_gnutls_strerror(ret));

489

513

gnutls_global_deinit();

490

514

return -1;

491

515

}

492

516

493

517

if(debug){

494

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

495

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

496

seckeyfilename);

518

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

519

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

520

pubkeyfilename,

521

seckeyfilename);

497

522

}

498

523

499

524

ret = gnutls_certificate_set_openpgp_key_file

500

525

(mc.cred, pubkeyfilename, seckeyfilename,

501

526

GNUTLS_OPENPGP_FMT_BASE64);

502

527

if(ret != GNUTLS_E_SUCCESS){

503

fprintf(stderr,

504

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

505

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

506

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

507

safer_gnutls_strerror(ret));

528

fprintf_plus(stderr,

529

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

530

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

531

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

532

safer_gnutls_strerror(ret));

508

533

goto globalfail;

509

534

}

510

535

511

536

/* GnuTLS server initialization */

512

537

ret = gnutls_dh_params_init(&mc.dh_params);

513

538

if(ret != GNUTLS_E_SUCCESS){

514

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

515

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

539

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

540

" initialization: %s\n",

541

safer_gnutls_strerror(ret));

516

542

goto globalfail;

517

543

}

518

544

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

519

545

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

546

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

547

safer_gnutls_strerror(ret));

522

548

goto globalfail;

523

549

}

524

550

544

570

}

545

571

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

546

572

if(ret != GNUTLS_E_SUCCESS){

547

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

548

safer_gnutls_strerror(ret));

573

fprintf_plus(stderr,

574

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

575

safer_gnutls_strerror(ret));

549

576

}

550

577

551

578

{

558

585

}

559

586

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

560

587

if(ret != GNUTLS_E_SUCCESS){

561

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

562

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

563

safer_gnutls_strerror(ret));

588

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

589

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

590

safer_gnutls_strerror(ret));

564

591

gnutls_deinit(*session);

565

592

return -1;

566

593

}

575

602

}

576

603

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

577

604

if(ret != GNUTLS_E_SUCCESS){

578

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

579

safer_gnutls_strerror(ret));

605

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

606

safer_gnutls_strerror(ret));

580

607

gnutls_deinit(*session);

581

608

return -1;

582

609

}

594

621

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

595

622

596

623

/* Called when a Mandos server is found */

597

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

624

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

598

625

AvahiIfIndex if_index,

599

626

int af){

600

627

int ret, tcp_sd = -1;

627

654

pf = PF_INET;

628

655

break;

629

656

default:

630

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

657

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

631

658

errno = EINVAL;

632

659

return -1;

633

660

}

638

665

}

639

666

640

667

if(debug){

641

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

642

"\n", ip, port);

668

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

669

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

643

670

}

644

671

645

672

tcp_sd = socket(pf, SOCK_STREAM, 0);

671

698

}

672

699

if(ret == 0){

673

700

int e = errno;

674

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

701

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

675

702

errno = e;

676

703

goto mandos_end;

677

704

}

678

705

if(af == AF_INET6){

679

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

680

-Wconversion and

681

-Wunreachable-code */

682

706

to.in6.sin6_port = htons(port);

683

707

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

684

708

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

685

-Wunreachable-code*/

709

-Wunreachable-code*/

686

710

if(if_index == AVAHI_IF_UNSPEC){

687

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

688

" without a network interface\n");

711

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

712

" incomplete without a network interface\n");

689

713

errno = EINVAL;

690

714

goto mandos_end;

691

715

}

709

733

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

710

734

perror_plus("if_indextoname");

711

735

} else {

712

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

713

ip, interface, port);

736

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

737

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

714

738

}

715

739

} else {

716

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

717

port);

740

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

741

ip, (uintmax_t)port);

718

742

}

719

743

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

720

744

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

730

754

perror_plus("inet_ntop");

731

755

} else {

732

756

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

733

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

757

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

734

758

}

735

759

}

736

760

}

764

788

while(true){

765

789

size_t out_size = strlen(out);

766

790

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

767

out_size - written));

791

out_size - written));

768

792

if(ret == -1){

769

793

int e = errno;

770

794

perror_plus("write");

790

814

}

791

815

792

816

if(debug){

793

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

817

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

794

818

}

795

819

796

820

if(quit_now){

798

822

goto mandos_end;

799

823

}

800

824

801

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

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

825

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

826

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

827

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

828

gnutls_transport_set_ptr(session,

829

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

803

830

804

831

if(quit_now){

805

832

errno = EINTR;

816

843

817

844

if(ret != GNUTLS_E_SUCCESS){

818

845

if(debug){

819

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

846

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

820

847

gnutls_perror(ret);

821

848

}

822

849

errno = EPROTO;

826

853

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

827

854

828

855

if(debug){

829

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

830

ip);

856

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

857

" %s\n", ip);

831

858

}

832

859

833

860

while(true){

838

865

}

839

866

840

867

buffer_capacity = incbuffer(&buffer, buffer_length,

841

buffer_capacity);

868

buffer_capacity);

842

869

if(buffer_capacity == 0){

843

870

int e = errno;

844

871

perror_plus("incbuffer");

871

898

}

872

899

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

873

900

if(ret < 0){

874

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

901

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

902

"***\n");

875

903

gnutls_perror(ret);

876

904

errno = EPROTO;

877

905

goto mandos_end;

878

906

}

879

907

break;

880

908

default:

881

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

882

" encrypted session with Mandos server\n");

909

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

910

" encrypted session with Mandos server\n");

883

911

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

912

errno = EIO;

885

913

goto mandos_end;

890

918

}

891

919

892

920

if(debug){

893

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

921

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

894

922

}

895

923

896

924

if(quit_now){

908

936

909

937

if(buffer_length > 0){

910

938

ssize_t decrypted_buffer_size;

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

939

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

913

940

&decrypted_buffer);

914

941

if(decrypted_buffer_size >= 0){

915

942

926

953

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

927

954

int e = errno;

928

955

if(debug){

929

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

930

strerror(errno));

956

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

957

strerror(errno));

931

958

}

932

959

errno = e;

933

960

goto mandos_end;

978

1005

AVAHI_GCC_UNUSED AvahiLookupResultFlags

979

1006

flags,

980

1007

AVAHI_GCC_UNUSED void* userdata){

981

assert(r);

1008

if(r == NULL){

1009

return;

1010

}

982

1011

983

1012

/* Called whenever a service has been resolved successfully or

984

1013

timed out */

990

1019

switch(event){

991

1020

default:

992

1021

case AVAHI_RESOLVER_FAILURE:

993

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

994

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

995

avahi_strerror(avahi_server_errno(mc.server)));

1022

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

1023

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

1024

domain,

1025

avahi_strerror(avahi_server_errno(mc.server)));

996

1026

break;

997

1027

998

1028

case AVAHI_RESOLVER_FOUND:

1000

1030

char ip[AVAHI_ADDRESS_STR_MAX];

1001

1031

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

1002

1032

if(debug){

1003

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

1004

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

1005

ip, (intmax_t)interface, port);

1033

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

1034

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

1035

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

1006

1036

}

1007

int ret = start_mandos_communication(ip, port, interface,

1037

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

1038

interface,

1008

1039

avahi_proto_to_af(proto));

1009

1040

if(ret == 0){

1010

1041

avahi_simple_poll_quit(mc.simple_poll);

1011

1042

} else {

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1043

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

1044

avahi_proto_to_af(proto))){

1045

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

1046

" list\n", name);

1047

}

1014

1048

}

1015

1049

}

1016

1050

}

1027

1061

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1028

1062

flags,

1029

1063

AVAHI_GCC_UNUSED void* userdata){

1030

assert(b);

1064

if(b == NULL){

1065

return;

1066

}

1031

1067

1032

1068

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

1033

1069

is removed from the LAN */

1040

1076

default:

1041

1077

case AVAHI_BROWSER_FAILURE:

1042

1078

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1079

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1045

1081

avahi_simple_poll_quit(mc.simple_poll);

1046

1082

return;

1047

1083

1054

1090

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

1055

1091

name, type, domain, protocol, 0,

1056

1092

resolve_callback, NULL) == NULL)

1057

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

1058

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

1093

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

1094

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1059

1096

break;

1060

1097

1061

1098

case AVAHI_BROWSER_REMOVE:

1064

1101

case AVAHI_BROWSER_ALL_FOR_NOW:

1065

1102

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1066

1103

if(debug){

1067

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

1104

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

1105

" searching...\n");

1068

1106

}

1069

1107

break;

1070

1108

}

1085

1123

errno = old_errno;

1086

1124

}

1087

1125

1126

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

1127

int ret;

1128

error_t ret_errno;

1129

1130

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

1131

if(s < 0){

1132

ret_errno = errno;

1133

perror_plus("socket");

1134

errno = ret_errno;

1135

return false;

1136

}

1137

strcpy(ifr->ifr_name, ifname);

1138

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1139

if(ret == -1){

1140

if(debug){

1141

ret_errno = errno;

1142

perror_plus("ioctl SIOCGIFFLAGS");

1143

errno = ret_errno;

1144

}

1145

return false;

1146

}

1147

return true;

1148

}

1149

1150

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

1151

1152

/* Reject the loopback device */

1153

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(debug){

1155

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

1156

ifname);

1157

}

1158

return false;

1159

}

1160

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

1161

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

1162

if(debug){

1163

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

1164

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

1165

}

1166

return true;

1167

}

1168

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

1169

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

1170

if(debug){

1171

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1172

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

1173

}

1174

return false;

1175

}

1176

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

1177

if(ifr->ifr_flags & IFF_NOARP){

1178

if(debug){

1179

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

1180

ifname);

1181

}

1182

return false;

1183

}

1184

1185

/* Accept this device */

1186

if(debug){

1187

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

1188

}

1189

return true;

1190

}

1191

1088

1192

/*

1089

1193

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

1090

1194

* corresponds to an acceptable network device.

1091

1195

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

1092

1196

*/

1093

1197

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

1198

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

1097

1199

return 0;

1098

1200

}

1099

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

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

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

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

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

1113

/* read line from flags_fd */

1114

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1115

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

1116

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

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

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

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

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

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1144

if(debug){

1145

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

1146

flagstring, if_entry->d_name);

1147

}

1148

free(flagstring);

1149

return 0;

1150

}

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1153

/* Reject the loopback device */

1154

if(flags & IFF_LOOPBACK){

1155

if(debug){

1156

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

1157

if_entry->d_name);

1158

}

1159

return 0;

1160

}

1161

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

1162

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

1163

if(debug){

1164

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

1165

if_entry->d_name);

1166

}

1167

return 1;

1168

}

1169

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

1170

if(not (flags & IFF_BROADCAST)){

1171

if(debug){

1172

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

1173

if_entry->d_name);

1174

}

1175

return 0;

1176

}

1177

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

1178

if(flags & IFF_NOARP){

1179

if(debug){

1180

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

1181

if_entry->d_name);

1182

}

1183

return 0;

1184

}

1185

/* Accept this device */

1186

if(debug){

1187

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

1188

if_entry->d_name);

1201

1202

struct ifreq ifr;

1203

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

1204

if(debug){

1205

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

1206

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

1207

}

1208

return 0;

1209

}

1210

1211

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

1212

return 0;

1189

1213

}

1190

1214

return 1;

1191

1215

}

1192

1216

1217

/*

1218

* This function determines if a network interface is up.

1219

*/

1220

bool interface_is_up(const char *interface){

1221

struct ifreq ifr;

1222

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

1223

if(debug){

1224

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

1225

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

1226

}

1227

return false;

1228

}

1229

1230

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

1231

}

1232

1233

/*

1234

* This function determines if a network interface is running

1235

*/

1236

bool interface_is_running(const char *interface){

1237

struct ifreq ifr;

1238

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

1239

if(debug){

1240

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

1241

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

1242

}

1243

return false;

1244

}

1245

1246

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

1247

}

1248

1193

1249

int notdotentries(const struct dirent *direntry){

1194

1250

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

1195

1251

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

1201

1257

return 1;

1202

1258

}

1203

1259

1260

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

1261

int runnable_hook(const struct dirent *direntry){

1262

int ret;

1263

size_t sret;

1264

struct stat st;

1265

1266

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

1267

/* Empty name? */

1268

return 0;

1269

}

1270

1271

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

1272

"abcdefghijklmnopqrstuvwxyz"

1273

"0123456789"

1274

"_-");

1275

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

1276

/* Contains non-allowed characters */

1277

if(debug){

1278

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

1279

direntry->d_name);

1280

}

1281

return 0;

1282

}

1283

1284

char *fullname = NULL;

1285

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

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1292

if(ret == -1){

1293

if(debug){

1294

perror_plus("Could not stat hook");

1295

}

1296

return 0;

1297

}

1298

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

1299

/* Not a regular file */

1300

if(debug){

1301

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

1302

direntry->d_name);

1303

}

1304

return 0;

1305

}

1306

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

1307

/* Not executable */

1308

if(debug){

1309

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

1310

direntry->d_name);

1311

}

1312

return 0;

1313

}

1314

if(debug){

1315

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

1316

direntry->d_name);

1317

}

1318

return 1;

1319

}

1320

1204

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1205

1322

int ret;

1206

1323

struct timespec now;

1210

1327

while(true){

1211

1328

if(mc.current_server == NULL){

1212

1329

if (debug){

1213

fprintf(stderr,

1214

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

1330

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

1331

" No timeout!\n");

1215

1332

}

1216

1333

ret = avahi_simple_poll_iterate(s, -1);

1217

1334

} else {

1218

1335

if (debug){

1219

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

1220

" or wait\n");

1336

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

1337

" it, or wait\n");

1221

1338

}

1222

1339

/* the current time */

1223

1340

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1239

1356

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

1240

1357

1241

1358

if (debug){

1242

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

1359

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

1360

block_time);

1243

1361

}

1244

1362

1245

1363

if(block_time <= 0){

1265

1383

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

1266

1384

}

1267

1385

if(ret != 0){

1268

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

1386

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

1269

1387

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

1270

1388

}

1271

1389

}

1272

1390

}

1273

1391

}

1274

1392

1393

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

1394

error_t raise_privileges(void){

1395

error_t old_errno = errno;

1396

error_t ret_errno = 0;

1397

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

1398

ret_errno = errno;

1399

perror_plus("seteuid");

1400

}

1401

errno = old_errno;

1402

return ret_errno;

1403

}

1404

1405

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

1406

error_t raise_privileges_permanently(void){

1407

error_t old_errno = errno;

1408

error_t ret_errno = raise_privileges();

1409

if(ret_errno != 0){

1410

errno = old_errno;

1411

return ret_errno;

1412

}

1413

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

1414

ret_errno = errno;

1415

perror_plus("seteuid");

1416

}

1417

errno = old_errno;

1418

return ret_errno;

1419

}

1420

1421

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

1422

error_t lower_privileges(void){

1423

error_t old_errno = errno;

1424

error_t ret_errno = 0;

1425

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

1426

ret_errno = errno;

1427

perror_plus("seteuid");

1428

}

1429

errno = old_errno;

1430

return ret_errno;

1431

}

1432

1433

/* Lower privileges permanently */

1434

error_t lower_privileges_permanently(void){

1435

error_t old_errno = errno;

1436

error_t ret_errno = 0;

1437

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

1438

ret_errno = errno;

1439

perror_plus("setuid");

1440

}

1441

errno = old_errno;

1442

return ret_errno;

1443

}

1444

1445

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

1446

const float delay){

1447

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

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

1451

alphasort);

1452

if(numhooks == -1){

1453

perror_plus("scandir");

1454

} else {

1455

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

1456

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

1457

direntry = direntries[i];

1458

char *fullname = NULL;

1459

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

1460

if(ret < 0){

1461

perror_plus("asprintf");

1462

continue;

1463

}

1464

if(debug){

1465

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

1466

direntry->d_name);

1467

}

1468

pid_t hook_pid = fork();

1469

if(hook_pid == 0){

1470

/* Child */

1471

/* Raise privileges */

1472

raise_privileges_permanently();

1473

/* Set group */

1474

errno = 0;

1475

ret = setgid(0);

1476

if(ret == -1){

1477

perror_plus("setgid");

1478

}

1479

/* Reset supplementary groups */

1480

errno = 0;

1481

ret = setgroups(0, NULL);

1482

if(ret == -1){

1483

perror_plus("setgroups");

1484

}

1485

dup2(devnull, STDIN_FILENO);

1486

close(devnull);

1487

dup2(STDERR_FILENO, STDOUT_FILENO);

1488

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

1489

if(ret == -1){

1490

perror_plus("setenv");

1491

_exit(EX_OSERR);

1492

}

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

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

1499

if(ret == -1){

1500

perror_plus("setenv");

1501

_exit(EX_OSERR);

1502

}

1503

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

1504

if(ret == -1){

1505

perror_plus("setenv");

1506

_exit(EX_OSERR);

1507

}

1508

char *delaystring;

1509

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

1510

if(ret == -1){

1511

perror_plus("asprintf");

1512

_exit(EX_OSERR);

1513

}

1514

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

1515

if(ret == -1){

1516

free(delaystring);

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1520

free(delaystring);

1521

if(connect_to != NULL){

1522

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

1523

if(ret == -1){

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

1527

}

1528

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

1529

perror_plus("execl");

1530

_exit(EXIT_FAILURE);

1531

}

1532

} else {

1533

int status;

1534

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

1535

perror_plus("waitpid");

1536

free(fullname);

1537

continue;

1538

}

1539

if(WIFEXITED(status)){

1540

if(WEXITSTATUS(status) != 0){

1541

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

1542

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

1543

WEXITSTATUS(status));

1544

free(fullname);

1545

continue;

1546

}

1547

} else if(WIFSIGNALED(status)){

1548

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

1549

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

1550

WTERMSIG(status));

1551

free(fullname);

1552

continue;

1553

} else {

1554

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

1555

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

1556

free(fullname);

1557

continue;

1558

}

1559

}

1560

free(fullname);

1561

if(debug){

1562

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

1563

direntry->d_name);

1564

}

1565

}

1566

close(devnull);

1567

}

1568

return true;

1569

}

1570

1571

error_t bring_up_interface(const char *const interface,

1572

const float delay){

1573

int sd = -1;

1574

error_t old_errno = errno;

1575

error_t ret_errno = 0;

1576

int ret, ret_setflags;

1577

struct ifreq network;

1578

unsigned int if_index = if_nametoindex(interface);

1579

if(if_index == 0){

1580

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

1581

errno = old_errno;

1582

return ENXIO;

1583

}

1584

1585

if(quit_now){

1586

errno = old_errno;

1587

return EINTR;

1588

}

1589

1590

if(not interface_is_up(interface)){

1591

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

1592

ret_errno = errno;

1593

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

1594

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

1595

return ret_errno;

1596

}

1597

network.ifr_flags |= IFF_UP;

1598

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

1601

ret_errno = errno;

1602

perror_plus("socket");

1603

errno = old_errno;

1604

return ret_errno;

1605

}

1606

1607

if(quit_now){

1608

close(sd);

1609

errno = old_errno;

1610

return EINTR;

1611

}

1612

1613

if(debug){

1614

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

1615

interface);

1616

}

1617

1618

/* Raise priviliges */

1619

raise_privileges();

1620

1621

#ifdef __linux__

1622

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1623

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

1624

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

1625

bool restore_loglevel = true;

1626

if(ret_linux == -1){

1627

restore_loglevel = false;

1628

perror_plus("klogctl");

1629

}

1630

#endif /* __linux__ */

1631

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

1632

ret_errno = errno;

1633

#ifdef __linux__

1634

if(restore_loglevel){

1635

ret_linux = klogctl(7, NULL, 0);

1636

if(ret_linux == -1){

1637

perror_plus("klogctl");

1638

}

1639

}

1640

#endif /* __linux__ */

1641

1642

/* Lower privileges */

1643

lower_privileges();

1644

1645

/* Close the socket */

1646

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

1647

if(ret == -1){

1648

perror_plus("close");

1649

}

1650

1651

if(ret_setflags == -1){

1652

errno = ret_errno;

1653

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1654

errno = old_errno;

1655

return ret_errno;

1656

}

1657

} else if(debug){

1658

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

1659

interface);

1660

}

1661

1662

/* Sleep checking until interface is running.

1663

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

1664

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

1665

if(interface_is_running(interface)){

1666

break;

1667

}

1668

struct timespec sleeptime = { .tv_nsec = 250000000 };

1669

ret = nanosleep(&sleeptime, NULL);

1670

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

1671

perror_plus("nanosleep");

1672

}

1673

}

1674

1675

errno = old_errno;

1676

return 0;

1677

}

1678

1679

error_t take_down_interface(const char *const interface){

1680

int sd = -1;

1681

error_t old_errno = errno;

1682

error_t ret_errno = 0;

1683

int ret, ret_setflags;

1684

struct ifreq network;

1685

unsigned int if_index = if_nametoindex(interface);

1686

if(if_index == 0){

1687

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

1688

errno = old_errno;

1689

return ENXIO;

1690

}

1691

if(interface_is_up(interface)){

1692

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

1693

ret_errno = errno;

1694

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

1695

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

1696

return ret_errno;

1697

}

1698

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

1699

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

1702

ret_errno = errno;

1703

perror_plus("socket");

1704

errno = old_errno;

1705

return ret_errno;

1706

}

1707

1708

if(debug){

1709

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

1710

interface);

1711

}

1712

1713

/* Raise priviliges */

1714

raise_privileges();

1715

1716

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

1717

ret_errno = errno;

1718

1719

/* Lower privileges */

1720

lower_privileges();

1721

1722

/* Close the socket */

1723

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

1724

if(ret == -1){

1725

perror_plus("close");

1726

}

1727

1728

if(ret_setflags == -1){

1729

errno = ret_errno;

1730

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1731

errno = old_errno;

1732

return ret_errno;

1733

}

1734

} else if(debug){

1735

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

1736

interface);

1737

}

1738

1739

errno = old_errno;

1740

return 0;

1741

}

1742

1275

1743

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

1276

1744

AvahiSServiceBrowser *sb = NULL;

1277

int error;

1745

error_t ret_errno;

1278

1746

int ret;

1279

1747

intmax_t tmpmax;

1280

1748

char *tmp;

1281

1749

int exitcode = EXIT_SUCCESS;

1282

const char *interface = "";

1283

struct ifreq network;

1284

int sd = -1;

1285

bool take_down_interface = false;

1286

uid_t uid;

1287

gid_t gid;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

1752

char *interfaces_to_take_down = NULL;

1753

size_t interfaces_to_take_down_size = 0;

1288

1754

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

1289

1755

bool tempdir_created = false;

1290

1756

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1291

1757

const char *seckey = PATHDIR "/" SECKEY;

1292

1758

const char *pubkey = PATHDIR "/" PUBKEY;

1759

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

1293

1761

1294

1762

bool gnutls_initialized = false;

1295

1763

bool gpgme_initialized = false;

1357

1825

.group = 2 },

1358

1826

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

1359

1827

.arg = "SECONDS",

1360

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

1828

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

1829

.group = 2 },

1830

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

1831

.arg = "DIR",

1832

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

1361

1833

.group = 2 },

1362

1834

/*

1363

1835

* These reproduce what we would get without ARGP_NO_HELP

1382

1854

connect_to = arg;

1383

1855

break;

1384

1856

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

1385

interface = arg;

1857

ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,

1858

(int)',');

1859

if(ret_errno != 0){

1860

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

1861

}

1386

1862

break;

1387

1863

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

1388

1864

seckey = arg;

1417

1893

argp_error(state, "Bad retry interval");

1418

1894

}

1419

1895

break;

1896

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

1897

hookdir = arg;

1898

break;

1420

1899

/*

1421

1900

* These reproduce what we would get without ARGP_NO_HELP

1422

1901

*/

1428

1907

argp_state_help(state, state->out_stream,

1429

1908

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1430

1909

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

1431

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

1910

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

1432

1911

exit(argp_err_exit_status);

1433

1912

break;

1434

1913

default:

1461

1940

{

1462

1941

/* Work around Debian bug #633582:

1463

1942

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

1464

struct stat st;

1465

1943

1466

1944

/* Re-raise priviliges */

1467

errno = 0;

1468

ret = seteuid(0);

1469

if(ret == -1){

1470

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

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

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

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

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

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

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

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

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

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

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

1945

if(raise_privileges() == 0){

1946

struct stat st;

1947

1948

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

1949

int seckey_fd = open(seckey, O_RDONLY);

1950

if(seckey_fd == -1){

1951

perror_plus("open");

1952

} else {

1953

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

1954

if(ret == -1){

1955

perror_plus("fstat");

1956

} else {

1957

if(S_ISREG(st.st_mode)

1958

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

1959

ret = fchown(seckey_fd, uid, gid);

1960

if(ret == -1){

1961

perror_plus("fchown");

1962

}

1963

}

1964

}

1965

TEMP_FAILURE_RETRY(close(seckey_fd));

1966

}

1967

}

1968

1969

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

1970

int pubkey_fd = open(pubkey, O_RDONLY);

1971

if(pubkey_fd == -1){

1972

perror_plus("open");

1973

} else {

1974

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

1975

if(ret == -1){

1976

perror_plus("fstat");

1977

} else {

1978

if(S_ISREG(st.st_mode)

1979

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

1980

ret = fchown(pubkey_fd, uid, gid);

1981

if(ret == -1){

1982

perror_plus("fchown");

1983

}

1984

}

1985

}

1986

TEMP_FAILURE_RETRY(close(pubkey_fd));

1987

}

1988

}

1989

1990

/* Lower privileges */

1991

errno = 0;

1992

ret = seteuid(uid);

1993

if(ret == -1){

1994

perror_plus("seteuid");

1995

}

1996

}

1997

}

1998

1999

/* Remove empty interface names */

2000

{

2001

char *interface = NULL;

2002

while((interface = argz_next(interfaces, interfaces_size,

2003

interface))){

2004

if(if_nametoindex(interface) == 0){

2005

if(interface[0] != '\0' and strcmp(interface, "none") != 0){

2006

fprintf_plus(stderr, "Not using nonexisting interface"

2007

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

2008

}

2009

argz_delete(&interfaces, &interfaces_size, interface);

2010

interface = NULL;

2011

}

2012

}

2013

}

2014

2015

/* Run network hooks */

2016

{

2017

ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,

2018

interfaces, interfaces_size);

2019

if(ret_errno != 0){

2020

errno = ret_errno;

2021

perror_plus("argz_append");

2022

goto end;

2023

}

2024

argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');

2025

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

2026

goto end;

1518

2027

}

1519

2028

}

1520

2029

1521

2030

if(not debug){

1522

2031

avahi_set_log_function(empty_log);

1523

2032

}

1524

1525

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

1526

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1528

alphasort);

1529

if(ret >= 1){

1530

/* Pick the first good interface */

1531

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

1532

if(debug){

1533

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

1534

}

1535

if(interface == NULL){

1536

perror_plus("malloc");

1537

free(direntries);

1538

exitcode = EXIT_FAILURE;

1539

goto end;

1540

}

1541

free(direntries);

1542

} else {

1543

free(direntries);

1544

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

1545

exitcode = EXIT_FAILURE;

1546

goto end;

1547

}

1548

}

1549

2033

1550

2034

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

1551

2035

from the signal handler */

1553

2037

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

1554

2038

mc.simple_poll = avahi_simple_poll_new();

1555

2039

if(mc.simple_poll == NULL){

1556

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

2040

fprintf_plus(stderr,

2041

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

1557

2042

exitcode = EX_UNAVAILABLE;

1558

2043

goto end;

1559

2044

}

1621

2106

}

1622

2107

}

1623

2108

1624

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

1625

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

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

if(if_index == 0){

1628

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

1629

exitcode = EX_UNAVAILABLE;

1630

goto end;

1631

}

1632

1633

if(quit_now){

1634

goto end;

1635

}

1636

1637

/* Re-raise priviliges */

1638

errno = 0;

1639

ret = seteuid(0);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

1644

#ifdef __linux__

1645

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1646

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

1647

ret = klogctl(8, NULL, 5);

1648

bool restore_loglevel = true;

1649

if(ret == -1){

1650

restore_loglevel = false;

1651

perror_plus("klogctl");

1652

}

1653

#endif /* __linux__ */

1654

1655

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1656

if(sd < 0){

1657

perror_plus("socket");

1658

exitcode = EX_OSERR;

1659

#ifdef __linux__

1660

if(restore_loglevel){

1661

ret = klogctl(7, NULL, 0);

1662

if(ret == -1){

1663

perror_plus("klogctl");

1664

}

1665

}

1666

#endif /* __linux__ */

1667

/* Lower privileges */

1668

errno = 0;

1669

ret = seteuid(uid);

1670

if(ret == -1){

1671

perror_plus("seteuid");

1672

}

1673

goto end;

1674

}

1675

strcpy(network.ifr_name, interface);

1676

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

1677

if(ret == -1){

1678

perror_plus("ioctl SIOCGIFFLAGS");

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret = klogctl(7, NULL, 0);

1682

if(ret == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

exitcode = EX_OSERR;

1688

/* Lower privileges */

1689

errno = 0;

1690

ret = seteuid(uid);

1691

if(ret == -1){

1692

perror_plus("seteuid");

1693

}

1694

goto end;

1695

}

1696

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

1697

network.ifr_flags |= IFF_UP;

1698

take_down_interface = true;

1699

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

1700

if(ret == -1){

1701

take_down_interface = false;

1702

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1703

exitcode = EX_OSERR;

1704

#ifdef __linux__

1705

if(restore_loglevel){

1706

ret = klogctl(7, NULL, 0);

1707

if(ret == -1){

1708

perror_plus("klogctl");

1709

}

1710

}

1711

#endif /* __linux__ */

1712

/* Lower privileges */

1713

errno = 0;

1714

ret = seteuid(uid);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

}

1718

goto end;

1719

}

1720

}

1721

/* Sleep checking until interface is running.

1722

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

1723

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

1724

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

1725

if(ret == -1){

1726

perror_plus("ioctl SIOCGIFFLAGS");

1727

} else if(network.ifr_flags & IFF_RUNNING){

1728

break;

1729

}

1730

struct timespec sleeptime = { .tv_nsec = 250000000 };

1731

ret = nanosleep(&sleeptime, NULL);

1732

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

1733

perror_plus("nanosleep");

1734

}

1735

}

1736

if(not take_down_interface){

1737

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

1738

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

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1742

}

1743

#ifdef __linux__

1744

if(restore_loglevel){

1745

/* Restores kernel loglevel to default */

1746

ret = klogctl(7, NULL, 0);

1747

if(ret == -1){

1748

perror_plus("klogctl");

1749

}

1750

}

1751

#endif /* __linux__ */

1752

/* Lower privileges */

1753

errno = 0;

1754

if(take_down_interface){

1755

/* Lower privileges */

1756

ret = seteuid(uid);

1757

if(ret == -1){

1758

perror_plus("seteuid");

1759

}

2109

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

2110

if(interfaces == NULL){

2111

struct dirent **direntries;

2112

/* Look for any good interfaces */

2113

ret = scandir(sys_class_net, &direntries, good_interface,

2114

alphasort);

2115

if(ret >= 1){

2116

/* Add all found interfaces to interfaces list */

2117

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

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2119

direntries[i]->d_name);

2120

if(ret_errno != 0){

2121

perror_plus("argz_add");

2122

continue;

2123

}

2124

if(debug){

2125

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

2126

direntries[i]->d_name);

2127

}

2128

}

2129

free(direntries);

1760

2130

} else {

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

2131

free(direntries);

2132

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

2133

exitcode = EXIT_FAILURE;

2134

goto end;

2135

}

2136

}

2137

2138

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

2139

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

2140

if(debug){

2141

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

2142

interfaces);

2143

}

2144

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2145

}

2146

2147

/* Bring up interfaces which are down */

2148

if(not (argz_count(interfaces, interfaces_size) == 1

2149

and strcmp(interfaces, "none") == 0)){

2150

char *interface = NULL;

2151

while((interface = argz_next(interfaces, interfaces_size,

2152

interface))){

2153

bool interface_was_up = interface_is_up(interface);

2154

ret = bring_up_interface(interface, delay);

2155

if(not interface_was_up){

2156

if(ret != 0){

2157

errno = ret;

2158

perror_plus("Failed to bring up interface");

2159

} else {

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2163

}

1765

2164

}

1766

2165

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2169

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

2170

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

2171

}

1767

2172

}

1768

2173

1769

2174

if(quit_now){

1772

2177

1773

2178

ret = init_gnutls_global(pubkey, seckey);

1774

2179

if(ret == -1){

1775

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

2180

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

1776

2181

exitcode = EX_UNAVAILABLE;

1777

2182

goto end;

1778

2183

} else {

1794

2199

}

1795

2200

1796

2201

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

1797

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

2202

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

1798

2203

exitcode = EX_UNAVAILABLE;

1799

2204

goto end;

1800

2205

} else {

1809

2214

/* Connect directly, do not use Zeroconf */

1810

2215

/* (Mainly meant for debugging) */

1811

2216

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

2217

1812

2218

if(address == NULL){

1813

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

2219

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

1814

2220

exitcode = EX_USAGE;

1815

2221

goto end;

1816

2222

}

1819

2225

goto end;

1820

2226

}

1821

2227

1822

uint16_t port;

2228

in_port_t port;

1823

2229

errno = 0;

1824

2230

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

1825

2231

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

1826

or tmpmax != (uint16_t)tmpmax){

1827

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

2232

or tmpmax != (in_port_t)tmpmax){

2233

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

1828

2234

exitcode = EX_USAGE;

1829

2235

goto end;

1830

2236

}

1833

2239

goto end;

1834

2240

}

1835

2241

1836

port = (uint16_t)tmpmax;

2242

port = (in_port_t)tmpmax;

1837

2243

*address = '\0';

1838

2244

/* Colon in address indicates IPv6 */

1839

2245

int af;

1860

2266

break;

1861

2267

}

1862

2268

if(debug){

1863

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

1864

(int)retry_interval);

2269

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

2270

(int)retry_interval);

1865

2271

}

1866

2272

sleep((int)retry_interval);

1867

2273

}

1869

2275

if (not quit_now){

1870

2276

exitcode = EXIT_SUCCESS;

1871

2277

}

1872

2278

1873

2279

goto end;

1874

2280

}

1875

2281

1889

2295

/* Allocate a new server */

1890

2296

mc.server = avahi_server_new(avahi_simple_poll_get

1891

2297

(mc.simple_poll), &config, NULL,

1892

NULL, &error);

2298

NULL, &ret_errno);

1893

2299

1894

2300

/* Free the Avahi configuration data */

1895

2301

avahi_server_config_free(&config);

1897

2303

1898

2304

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

1899

2305

if(mc.server == NULL){

1900

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

1901

avahi_strerror(error));

2306

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

2307

avahi_strerror(ret_errno));

1902

2308

exitcode = EX_UNAVAILABLE;

1903

2309

goto end;

1904

2310

}

1912

2318

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1913

2319

NULL, 0, browse_callback, NULL);

1914

2320

if(sb == NULL){

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

2321

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

2322

avahi_strerror(avahi_server_errno(mc.server)));

1917

2323

exitcode = EX_UNAVAILABLE;

1918

2324

goto end;

1919

2325

}

1925

2331

/* Run the main loop */

1926

2332

1927

2333

if(debug){

1928

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

2334

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

1929

2335

}

1930

2336

1931

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

2338

(int)(retry_interval * 1000));

1933

2339

if(debug){

1934

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

1935

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

2340

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

2341

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

1936

2342

}

1937

2343

1938

2344

end:

1939

2345

1940

2346

if(debug){

1941

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

2347

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

1942

2348

}

1943

2349

1944

2350

/* Cleanup things */

1960

2366

if(gpgme_initialized){

1961

2367

gpgme_release(mc.ctx);

1962

2368

}

1963

2369

1964

2370

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

1965

2371

has seen */

1966

2372

if(mc.current_server != NULL){

1972

2378

}

1973

2379

}

1974

2380

1975

/* Take down the network interface */

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

1978

errno = 0;

1979

ret = seteuid(0);

1980

if(ret == -1){

1981

perror_plus("seteuid");

1982

}

1983

if(geteuid() == 0){

1984

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

1985

if(ret == -1){

1986

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2381

/* Re-raise priviliges */

2382

{

2383

raise_privileges();

2384

2385

/* Run network hooks */

2386

run_network_hooks("stop", interfaces_hooks, delay);

2387

2388

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

2389

{

2390

char *interface = NULL;

2391

while((interface=argz_next(interfaces_to_take_down,

2392

interfaces_to_take_down_size,

2393

interface))){

2394

ret_errno = take_down_interface(interface);

2395

if(ret_errno != 0){

2396

errno = ret_errno;

2397

perror_plus("Failed to take down interface");

1992

2398

}

1993

2399

}

1994

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

1995

if(ret == -1){

1996

perror_plus("close");

1997

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2400

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

2401

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

2402

" down\n");

2003

2403

}

2004

2404

}

2405

2406

lower_privileges_permanently();

2005

2407

}

2006

2408

2409

free(interfaces_to_take_down);

2410

free(interfaces_hooks);

2411

2007

2412

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

2008

2413

if(tempdir_created){

2009

2414

struct dirent **direntries = NULL;

2022

2427

}

2023

2428

ret = remove(fullname);

2024

2429

if(ret == -1){

2025

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

2026

strerror(errno));

2430

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

2431

strerror(errno));

2027

2432

}

2028

2433

free(fullname);

2029

2434

}