/mandos/trunk : revision 594

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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>.

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*/

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32

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

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42

#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 <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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#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 */

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

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WEXITSTATUS(), WTERMSIG() */

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

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91

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#ifdef __linux__

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93

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

108

111

init_gnutls_session(),

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112

GNUTLS_* */

110

113

#include <gnutls/openpgp.h>

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

114

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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116

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/* GPGME */

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118

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

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126

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

124

127

#define SECKEY "seckey.txt"

125

128

#define PUBKEY "pubkey.txt"

129

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

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130

127

131

bool debug = false;

128

132

static const char mandos_protocol_version[] = "1";

129

133

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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135

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

132

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

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138

134

139

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

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140

typedef struct server{

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170

166

171

/* Function to use when printing errors */

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172

void perror_plus(const char *print_text){

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int e = errno;

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174

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

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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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179

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

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

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va_list ap;

183

va_start (ap, format);

184

185

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

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program_invocation_short_name));

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

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}

189

173

190

/*

174

191

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

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192

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

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193

* "buffer_length" is how much is already used.

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194

*/

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

196

size_t buffer_capacity){

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197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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199

if(buffer == NULL){

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204

return buffer_capacity;

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}

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206

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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){

207

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

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

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int af){

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210

int ret;

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

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if(new_server == NULL){

196

213

perror_plus("malloc");

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return -1;

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return false;

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}

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

200

.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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return -1;

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return false;

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223

}

207

/* unique case of first server */

224

/* Special case of first server */

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if (mc.current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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

229

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

213

230

} else {

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new_server->next = mc.current_server;

215

232

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

219

236

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

220

237

if(ret == -1){

221

238

perror_plus("clock_gettime");

222

return -1;

239

return false;

223

240

}

224

return 0;

241

return true;

225

242

}

226

243

227

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/*

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245

* Initialize GPGME.

229

246

*/

230

static bool init_gpgme(const char *seckey,

231

const char *pubkey, const char *tempdir){

247

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

248

const char *tempdir){

232

249

gpgme_error_t rc;

233

250

gpgme_engine_info_t engine_info;

234

251

249

266

250

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

251

268

if(rc != GPG_ERR_NO_ERROR){

252

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

253

gpgme_strsource(rc), gpgme_strerror(rc));

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

254

271

return false;

255

272

}

256

273

257

274

rc = gpgme_op_import(mc.ctx, pgp_data);

258

275

if(rc != GPG_ERR_NO_ERROR){

259

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

260

gpgme_strsource(rc), gpgme_strerror(rc));

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

261

278

return false;

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279

}

263

280

270

287

}

271

288

272

289

if(debug){

273

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

290

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

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291

}

275

292

276

293

/* Init GPGME */

277

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gpgme_check_version(NULL);

278

295

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

279

296

if(rc != GPG_ERR_NO_ERROR){

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

282

299

return false;

283

300

}

284

301

285

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

302

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

286

303

rc = gpgme_get_engine_info(&engine_info);

287

304

if(rc != GPG_ERR_NO_ERROR){

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

290

307

return false;

291

308

}

292

309

while(engine_info != NULL){

298

315

engine_info = engine_info->next;

299

316

}

300

317

if(engine_info == NULL){

301

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

318

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

319

tempdir);

302

320

return false;

303

321

}

304

322

305

323

/* Create new GPGME "context" */

306

324

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

307

325

if(rc != GPG_ERR_NO_ERROR){

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

326

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

327

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

328

gpgme_strerror(rc));

310

329

return false;

311

330

}

312

331

350

ssize_t plaintext_length = 0;

332

351

333

352

if(debug){

334

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

353

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

335

354

}

336

355

337

356

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

338

357

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

339

358

0);

340

359

if(rc != GPG_ERR_NO_ERROR){

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

343

362

return -1;

344

363

}

345

364

346

365

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

347

366

rc = gpgme_data_new(&dh_plain);

348

367

if(rc != GPG_ERR_NO_ERROR){

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

351

371

gpgme_data_release(dh_crypto);

352

372

return -1;

353

373

}

356

376

data buffer */

357

377

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

358

378

if(rc != GPG_ERR_NO_ERROR){

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

361

381

plaintext_length = -1;

362

382

if(debug){

363

383

gpgme_decrypt_result_t result;

364

384

result = gpgme_op_decrypt_result(mc.ctx);

365

385

if(result == NULL){

366

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

386

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

367

387

} else {

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

372

392

if(result->file_name != NULL){

373

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

393

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

374

394

}

375

395

gpgme_recipient_t recipient;

376

396

recipient = result->recipients;

377

397

while(recipient != NULL){

378

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

379

gpgme_pubkey_algo_name(recipient->pubkey_algo));

380

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

381

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

382

recipient->status == GPG_ERR_NO_SECKEY

383

? "No" : "Yes");

398

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

399

gpgme_pubkey_algo_name

400

(recipient->pubkey_algo));

401

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

402

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

403

recipient->status == GPG_ERR_NO_SECKEY

404

? "No" : "Yes");

384

405

recipient = recipient->next;

385

406

}

386

407

}

389

410

}

390

411

391

412

if(debug){

392

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

413

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

393

414

}

394

415

395

416

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

402

423

*plaintext = NULL;

403

424

while(true){

404

425

plaintext_capacity = incbuffer(plaintext,

405

(size_t)plaintext_length,

406

plaintext_capacity);

426

(size_t)plaintext_length,

427

plaintext_capacity);

407

428

if(plaintext_capacity == 0){

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

411

432

}

412

433

413

434

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

426

447

}

427

448

428

449

if(debug){

429

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

450

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

430

451

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

431

452

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

432

453

}

454

475

/* GnuTLS log function callback */

455

476

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

456

477

const char* string){

457

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

478

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

458

479

}

459

480

460

481

static int init_gnutls_global(const char *pubkeyfilename,

462

483

int ret;

463

484

464

485

if(debug){

465

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

486

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

466

487

}

467

488

468

489

ret = gnutls_global_init();

469

490

if(ret != GNUTLS_E_SUCCESS){

470

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

471

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

472

493

return -1;

473

494

}

474

495

483

504

/* OpenPGP credentials */

484

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

485

506

if(ret != GNUTLS_E_SUCCESS){

486

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

487

safer_gnutls_strerror(ret));

507

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

508

safer_gnutls_strerror(ret));

488

509

gnutls_global_deinit();

489

510

return -1;

490

511

}

491

512

492

513

if(debug){

493

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

494

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

495

seckeyfilename);

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

496

518

}

497

519

498

520

ret = gnutls_certificate_set_openpgp_key_file

499

521

(mc.cred, pubkeyfilename, seckeyfilename,

500

522

GNUTLS_OPENPGP_FMT_BASE64);

501

523

if(ret != GNUTLS_E_SUCCESS){

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

524

fprintf_plus(stderr,

525

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

526

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

527

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

528

safer_gnutls_strerror(ret));

507

529

goto globalfail;

508

530

}

509

531

510

532

/* GnuTLS server initialization */

511

533

ret = gnutls_dh_params_init(&mc.dh_params);

512

534

if(ret != GNUTLS_E_SUCCESS){

513

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

514

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

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

515

538

goto globalfail;

516

539

}

517

540

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

518

541

if(ret != GNUTLS_E_SUCCESS){

519

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

520

safer_gnutls_strerror(ret));

542

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

543

safer_gnutls_strerror(ret));

521

544

goto globalfail;

522

545

}

523

546

543

566

}

544

567

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

545

568

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

548

572

}

549

573

550

574

{

557

581

}

558

582

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

559

583

if(ret != GNUTLS_E_SUCCESS){

560

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

561

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

562

safer_gnutls_strerror(ret));

584

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

585

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

586

safer_gnutls_strerror(ret));

563

587

gnutls_deinit(*session);

564

588

return -1;

565

589

}

574

598

}

575

599

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

576

600

if(ret != GNUTLS_E_SUCCESS){

577

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

578

safer_gnutls_strerror(ret));

601

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

602

safer_gnutls_strerror(ret));

579

603

gnutls_deinit(*session);

580

604

return -1;

581

605

}

626

650

pf = PF_INET;

627

651

break;

628

652

default:

629

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

653

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

630

654

errno = EINVAL;

631

655

return -1;

632

656

}

637

661

}

638

662

639

663

if(debug){

640

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

641

"\n", ip, port);

664

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

665

PRIu16 "\n", ip, port);

642

666

}

643

667

644

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

670

694

}

671

695

if(ret == 0){

672

696

int e = errno;

673

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

697

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

674

698

errno = e;

675

699

goto mandos_end;

676

700

}

681

705

682

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

683

707

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

684

-Wunreachable-code*/

708

-Wunreachable-code*/

685

709

if(if_index == AVAHI_IF_UNSPEC){

686

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

687

" without a network interface\n");

710

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

711

" incomplete without a network interface\n");

688

712

errno = EINVAL;

689

713

goto mandos_end;

690

714

}

708

732

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

709

733

perror_plus("if_indextoname");

710

734

} else {

711

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

712

ip, interface, port);

735

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

736

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

713

737

}

714

738

} else {

715

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

716

port);

739

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

740

ip, port);

717

741

}

718

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

719

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

729

753

perror_plus("inet_ntop");

730

754

} else {

731

755

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

732

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

756

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

733

757

}

734

758

}

735

759

}

763

787

while(true){

764

788

size_t out_size = strlen(out);

765

789

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

766

out_size - written));

790

out_size - written));

767

791

if(ret == -1){

768

792

int e = errno;

769

793

perror_plus("write");

789

813

}

790

814

791

815

if(debug){

792

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

816

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

793

817

}

794

818

795

819

if(quit_now){

797

821

goto mandos_end;

798

822

}

799

823

800

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

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

824

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

825

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

826

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

827

gnutls_transport_set_ptr(session,

828

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

802

829

803

830

if(quit_now){

804

831

errno = EINTR;

815

842

816

843

if(ret != GNUTLS_E_SUCCESS){

817

844

if(debug){

818

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

845

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

819

846

gnutls_perror(ret);

820

847

}

821

848

errno = EPROTO;

825

852

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

826

853

827

854

if(debug){

828

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

829

ip);

855

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

856

" %s\n", ip);

830

857

}

831

858

832

859

while(true){

837

864

}

838

865

839

866

buffer_capacity = incbuffer(&buffer, buffer_length,

840

buffer_capacity);

867

buffer_capacity);

841

868

if(buffer_capacity == 0){

842

869

int e = errno;

843

870

perror_plus("incbuffer");

870

897

}

871

898

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

872

899

if(ret < 0){

873

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

900

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

901

"***\n");

874

902

gnutls_perror(ret);

875

903

errno = EPROTO;

876

904

goto mandos_end;

877

905

}

878

906

break;

879

907

default:

880

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

881

" encrypted session with Mandos server\n");

908

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

909

" encrypted session with Mandos server\n");

882

910

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

911

errno = EIO;

884

912

goto mandos_end;

889

917

}

890

918

891

919

if(debug){

892

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

920

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

893

921

}

894

922

895

923

if(quit_now){

907

935

908

936

if(buffer_length > 0){

909

937

ssize_t decrypted_buffer_size;

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

938

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

912

939

&decrypted_buffer);

913

940

if(decrypted_buffer_size >= 0){

914

941

925

952

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

926

953

int e = errno;

927

954

if(debug){

928

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

929

strerror(errno));

955

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

956

strerror(errno));

930

957

}

931

958

errno = e;

932

959

goto mandos_end;

989

1016

switch(event){

990

1017

default:

991

1018

case AVAHI_RESOLVER_FAILURE:

992

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

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1019

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

1020

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

1021

domain,

1022

avahi_strerror(avahi_server_errno(mc.server)));

995

1023

break;

996

1024

997

1025

case AVAHI_RESOLVER_FOUND:

999

1027

char ip[AVAHI_ADDRESS_STR_MAX];

1000

1028

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

1001

1029

if(debug){

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1030

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

1031

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

1032

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

1005

1033

}

1006

1034

int ret = start_mandos_communication(ip, port, interface,

1007

1035

avahi_proto_to_af(proto));

1008

1036

if(ret == 0){

1009

1037

avahi_simple_poll_quit(mc.simple_poll);

1010

1038

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1039

if(not add_server(ip, port, interface,

1040

avahi_proto_to_af(proto))){

1041

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

1042

" list\n", name);

1043

}

1013

1044

}

1014

1045

}

1015

1046

}

1039

1070

default:

1040

1071

case AVAHI_BROWSER_FAILURE:

1041

1072

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1073

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

1074

avahi_strerror(avahi_server_errno(mc.server)));

1044

1075

avahi_simple_poll_quit(mc.simple_poll);

1045

1076

return;

1046

1077

1053

1084

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

1054

1085

name, type, domain, protocol, 0,

1055

1086

resolve_callback, NULL) == NULL)

1056

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

1057

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

1087

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

1088

" %s\n", name,

1089

avahi_strerror(avahi_server_errno(mc.server)));

1058

1090

break;

1059

1091

1060

1092

case AVAHI_BROWSER_REMOVE:

1063

1095

case AVAHI_BROWSER_ALL_FOR_NOW:

1064

1096

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1065

1097

if(debug){

1066

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

1098

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

1099

" searching...\n");

1067

1100

}

1068

1101

break;

1069

1102

}

1084

1117

errno = old_errno;

1085

1118

}

1086

1119

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

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

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1120

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

1121

int ret;

1122

1123

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

1124

if(s < 0){

1125

perror_plus("socket");

1126

return false;

1127

}

1128

strcpy(ifr->ifr_name, ifname);

1129

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1130

if(ret == -1){

1143

1131

if(debug){

1144

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

1145

flagstring, if_entry->d_name);

1132

perror_plus("ioctl SIOCGIFFLAGS");

1146

1133

}

1147

free(flagstring);

1148

return 0;

1134

return false;

1149

1135

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1136

return true;

1137

}

1138

1139

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

1140

1152

1141

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1142

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

1143

if(debug){

1155

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

1156

if_entry->d_name);

1144

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

1145

ifname);

1157

1146

}

1158

return 0;

1147

return false;

1159

1148

}

1160

1149

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

1161

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

1150

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

1162

1151

if(debug){

1163

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

1164

if_entry->d_name);

1152

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

1153

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

1165

1154

}

1166

return 1;

1155

return true;

1167

1156

}

1168

1157

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

1169

if(not (flags & IFF_BROADCAST)){

1158

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

1170

1159

if(debug){

1171

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

1172

if_entry->d_name);

1160

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1161

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

1173

1162

}

1174

return 0;

1163

return false;

1175

1164

}

1176

1165

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

1177

if(flags & IFF_NOARP){

1166

if(ifr->ifr_flags & IFF_NOARP){

1178

1167

if(debug){

1179

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

1180

if_entry->d_name);

1168

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

1169

ifname);

1181

1170

}

1182

return 0;

1171

return false;

1183

1172

}

1173

1184

1174

/* Accept this device */

1185

1175

if(debug){

1186

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

1187

if_entry->d_name);

1176

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

1177

}

1178

return true;

1179

}

1180

1181

/*

1182

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

1183

* corresponds to an acceptable network device.

1184

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

1185

*/

1186

int good_interface(const struct dirent *if_entry){

1187

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

1188

return 0;

1189

}

1190

1191

struct ifreq ifr;

1192

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

1193

if(debug){

1194

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

1195

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

1196

}

1197

return 0;

1198

}

1199

1200

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

1201

return 0;

1202

}

1203

return 1;

1204

}

1205

1206

/*

1207

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

1208

* corresponds to an acceptable network device which is up.

1209

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

1210

*/

1211

int up_interface(const struct dirent *if_entry){

1212

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

1213

return 0;

1214

}

1215

1216

struct ifreq ifr;

1217

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

1218

if(debug){

1219

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

1220

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

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject down interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

/* Reject non-running interfaces */

1235

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

1236

if(debug){

1237

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

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

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

1244

return 0;

1188

1245

}

1189

1246

return 1;

1190

1247

}

1200

1257

return 1;

1201

1258

}

1202

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

1203

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1204

1322

int ret;

1205

1323

struct timespec now;

1206

1324

struct timespec waited_time;

1207

1325

intmax_t block_time;

1208

1326

1209

1327

while(true){

1210

1328

if(mc.current_server == NULL){

1211

1329

if (debug){

1212

fprintf(stderr,

1213

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

1330

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

1331

" No timeout!\n");

1214

1332

}

1215

1333

ret = avahi_simple_poll_iterate(s, -1);

1216

1334

} else {

1217

1335

if (debug){

1218

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

1219

" or wait\n");

1336

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

1337

" it, or wait\n");

1220

1338

}

1221

1339

/* the current time */

1222

1340

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1236

1354

block_time = ((retry_interval

1237

1355

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

1238

1356

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

1239

1357

1240

1358

if (debug){

1241

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

1359

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

1360

block_time);

1242

1361

}

1243

1362

1244

1363

if(block_time <= 0){

1245

1364

ret = start_mandos_communication(mc.current_server->ip,

1246

1365

mc.current_server->port,

1264

1383

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

1265

1384

}

1266

1385

if(ret != 0){

1267

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

1386

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

1268

1387

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

1269

1388

}

1270

1389

}

1271

1390

}

1272

1391

}

1273

1392

1393

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

1394

const float delay){

1395

struct dirent **direntries;

1396

struct dirent *direntry;

1397

int ret;

1398

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

1399

alphasort);

1400

if(numhooks == -1){

1401

perror_plus("scandir");

1402

} else {

1403

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

1404

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

1405

direntry = direntries[i];

1406

char *fullname = NULL;

1407

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

1408

if(ret < 0){

1409

perror_plus("asprintf");

1410

continue;

1411

}

1412

if(debug){

1413

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

1414

direntry->d_name);

1415

}

1416

pid_t hook_pid = fork();

1417

if(hook_pid == 0){

1418

/* Child */

1419

/* Raise privileges */

1420

errno = 0;

1421

ret = seteuid(0);

1422

if(ret == -1){

1423

perror_plus("seteuid");

1424

}

1425

/* Raise privileges even more */

1426

errno = 0;

1427

ret = setuid(0);

1428

if(ret == -1){

1429

perror_plus("setuid");

1430

}

1431

/* Set group */

1432

errno = 0;

1433

ret = setgid(0);

1434

if(ret == -1){

1435

perror_plus("setgid");

1436

}

1437

/* Reset supplementary groups */

1438

errno = 0;

1439

ret = setgroups(0, NULL);

1440

if(ret == -1){

1441

perror_plus("setgroups");

1442

}

1443

dup2(devnull, STDIN_FILENO);

1444

close(devnull);

1445

dup2(STDERR_FILENO, STDOUT_FILENO);

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

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

1462

if(ret == -1){

1463

perror_plus("setenv");

1464

_exit(EX_OSERR);

1465

}

1466

char *delaystring;

1467

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

1468

if(ret == -1){

1469

perror_plus("asprintf");

1470

_exit(EX_OSERR);

1471

}

1472

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

1473

if(ret == -1){

1474

free(delaystring);

1475

perror_plus("setenv");

1476

_exit(EX_OSERR);

1477

}

1478

free(delaystring);

1479

if(connect_to != NULL){

1480

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

1481

if(ret == -1){

1482

perror_plus("setenv");

1483

_exit(EX_OSERR);

1484

}

1485

}

1486

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

1487

perror_plus("execl");

1488

_exit(EXIT_FAILURE);

1489

}

1490

} else {

1491

int status;

1492

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

1493

perror_plus("waitpid");

1494

free(fullname);

1495

continue;

1496

}

1497

if(WIFEXITED(status)){

1498

if(WEXITSTATUS(status) != 0){

1499

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

1500

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

1501

WEXITSTATUS(status));

1502

free(fullname);

1503

continue;

1504

}

1505

} else if(WIFSIGNALED(status)){

1506

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

1507

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

1508

WTERMSIG(status));

1509

free(fullname);

1510

continue;

1511

} else {

1512

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

1513

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

1514

free(fullname);

1515

continue;

1516

}

1517

}

1518

free(fullname);

1519

if(debug){

1520

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

1521

direntry->d_name);

1522

}

1523

}

1524

close(devnull);

1525

}

1526

return true;

1527

}

1528

1274

1529

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

1275

1530

AvahiSServiceBrowser *sb = NULL;

1276

1531

int error;

1356

1611

.group = 2 },

1357

1612

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

1358

1613

.arg = "SECONDS",

1359

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

1614

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

1615

.group = 2 },

1616

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

1617

.arg = "DIR",

1618

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

1360

1619

.group = 2 },

1361

1620

/*

1362

1621

* These reproduce what we would get without ARGP_NO_HELP

1411

1670

errno = 0;

1412

1671

retry_interval = strtod(arg, &tmp);

1413

1672

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

1414

or (retry_interval * 1000) > INT_MAX){

1673

or (retry_interval * 1000) > INT_MAX

1674

or retry_interval < 0){

1415

1675

argp_error(state, "Bad retry interval");

1416

1676

}

1417

1677

break;

1678

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

1679

hookdir = arg;

1680

break;

1418

1681

/*

1419

1682

* These reproduce what we would get without ARGP_NO_HELP

1420

1683

*/

1426

1689

argp_state_help(state, state->out_stream,

1427

1690

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1428

1691

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

1429

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

1692

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

1430

1693

exit(argp_err_exit_status);

1431

1694

break;

1432

1695

default:

1455

1718

goto end;

1456

1719

}

1457

1720

}

1721

1722

{

1723

/* Work around Debian bug #633582:

1724

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

1725

1726

/* Re-raise priviliges */

1727

errno = 0;

1728

ret = seteuid(0);

1729

if(ret == -1){

1730

perror_plus("seteuid");

1731

} else {

1732

struct stat st;

1733

1734

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

1735

int seckey_fd = open(seckey, O_RDONLY);

1736

if(seckey_fd == -1){

1737

perror_plus("open");

1738

} else {

1739

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

1740

if(ret == -1){

1741

perror_plus("fstat");

1742

} else {

1743

if(S_ISREG(st.st_mode)

1744

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

1745

ret = fchown(seckey_fd, uid, gid);

1746

if(ret == -1){

1747

perror_plus("fchown");

1748

}

1749

}

1750

}

1751

TEMP_FAILURE_RETRY(close(seckey_fd));

1752

}

1753

}

1754

1755

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

1756

int pubkey_fd = open(pubkey, O_RDONLY);

1757

if(pubkey_fd == -1){

1758

perror_plus("open");

1759

} else {

1760

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

1761

if(ret == -1){

1762

perror_plus("fstat");

1763

} else {

1764

if(S_ISREG(st.st_mode)

1765

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

1766

ret = fchown(pubkey_fd, uid, gid);

1767

if(ret == -1){

1768

perror_plus("fchown");

1769

}

1770

}

1771

}

1772

TEMP_FAILURE_RETRY(close(pubkey_fd));

1773

}

1774

}

1775

1776

/* Lower privileges */

1777

errno = 0;

1778

ret = seteuid(uid);

1779

if(ret == -1){

1780

perror_plus("seteuid");

1781

}

1782

}

1783

}

1784

1785

/* Run network hooks */

1786

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

1787

goto end;

1788

}

1458

1789

1459

1790

if(not debug){

1460

1791

avahi_set_log_function(empty_log);

1461

1792

}

1462

1793

1463

1794

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

1464

1795

struct dirent **direntries;

1465

ret = scandir(sys_class_net, &direntries, good_interface,

1796

/* First look for interfaces that are up */

1797

ret = scandir(sys_class_net, &direntries, up_interface,

1466

1798

alphasort);

1799

if(ret == 0){

1800

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

1801

free(direntries);

1802

ret = scandir(sys_class_net, &direntries, good_interface,

1803

alphasort);

1804

}

1467

1805

if(ret >= 1){

1468

/* Pick the first good interface */

1806

/* Pick the first interface returned */

1469

1807

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

1470

1808

if(debug){

1471

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

1809

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

1472

1810

}

1473

1811

if(interface == NULL){

1474

1812

perror_plus("malloc");

1479

1817

free(direntries);

1480

1818

} else {

1481

1819

free(direntries);

1482

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

1820

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

1483

1821

exitcode = EXIT_FAILURE;

1484

1822

goto end;

1485

1823

}

1491

1829

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

1492

1830

mc.simple_poll = avahi_simple_poll_new();

1493

1831

if(mc.simple_poll == NULL){

1494

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

1832

fprintf_plus(stderr,

1833

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

1495

1834

exitcode = EX_UNAVAILABLE;

1496

1835

goto end;

1497

1836

}

1563

1902

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

1564

1903

if_index = (AvahiIfIndex) if_nametoindex(interface);

1565

1904

if(if_index == 0){

1566

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

1905

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

1567

1906

exitcode = EX_UNAVAILABLE;

1568

1907

goto end;

1569

1908

}

1689

2028

#endif /* __linux__ */

1690

2029

/* Lower privileges */

1691

2030

errno = 0;

1692

if(take_down_interface){

1693

/* Lower privileges */

1694

ret = seteuid(uid);

1695

if(ret == -1){

1696

perror_plus("seteuid");

1697

}

1698

} else {

1699

/* Lower privileges permanently */

1700

ret = setuid(uid);

1701

if(ret == -1){

1702

perror_plus("setuid");

1703

}

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

1704

2035

}

1705

2036

}

1706

2037

1710

2041

1711

2042

ret = init_gnutls_global(pubkey, seckey);

1712

2043

if(ret == -1){

1713

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

2044

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

1714

2045

exitcode = EX_UNAVAILABLE;

1715

2046

goto end;

1716

2047

} else {

1732

2063

}

1733

2064

1734

2065

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

1735

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

2066

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

1736

2067

exitcode = EX_UNAVAILABLE;

1737

2068

goto end;

1738

2069

} else {

1748

2079

/* (Mainly meant for debugging) */

1749

2080

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

1750

2081

if(address == NULL){

1751

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

2082

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

1752

2083

exitcode = EX_USAGE;

1753

2084

goto end;

1754

2085

}

1762

2093

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

1763

2094

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

1764

2095

or tmpmax != (uint16_t)tmpmax){

1765

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

2096

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

1766

2097

exitcode = EX_USAGE;

1767

2098

goto end;

1768

2099

}

1773

2104

1774

2105

port = (uint16_t)tmpmax;

1775

2106

*address = '\0';

1776

address = connect_to;

1777

2107

/* Colon in address indicates IPv6 */

1778

2108

int af;

1779

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

2109

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

1780

2110

af = AF_INET6;

2111

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

2112

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

2113

{

2114

connect_to++;

2115

address[-1] = '\0';

2116

}

1781

2117

} else {

1782

2118

af = AF_INET;

1783

2119

}

2120

address = connect_to;

1784

2121

1785

2122

if(quit_now){

1786

2123

goto end;

1787

2124

}

1788

2125

1789

2126

while(not quit_now){

1790

2127

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

1791

2128

if(quit_now or ret == 0){

1792

2129

break;

1793

2130

}

1794

sleep((int)retry_interval or 1);

1795

};

1796

2131

if(debug){

2132

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

2133

(int)retry_interval);

2134

}

2135

sleep((int)retry_interval);

2136

}

2137

1797

2138

if (not quit_now){

1798

2139

exitcode = EXIT_SUCCESS;

1799

2140

}

1800

2141

1801

2142

goto end;

1802

2143

}

1803

2144

1825

2166

1826

2167

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

1827

2168

if(mc.server == NULL){

1828

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

1829

avahi_strerror(error));

2169

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

2170

avahi_strerror(error));

1830

2171

exitcode = EX_UNAVAILABLE;

1831

2172

goto end;

1832

2173

}

1840

2181

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1841

2182

NULL, 0, browse_callback, NULL);

1842

2183

if(sb == NULL){

1843

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

1844

avahi_strerror(avahi_server_errno(mc.server)));

2184

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

2185

avahi_strerror(avahi_server_errno(mc.server)));

1845

2186

exitcode = EX_UNAVAILABLE;

1846

2187

goto end;

1847

2188

}

1853

2194

/* Run the main loop */

1854

2195

1855

2196

if(debug){

1856

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

2197

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

1857

2198

}

1858

2199

1859

2200

ret = avahi_loop_with_timeout(mc.simple_poll,

1860

2201

(int)(retry_interval * 1000));

1861

2202

if(debug){

1862

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

1863

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

2203

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

2204

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

1864

2205

}

1865

2206

1866

2207

end:

1867

2208

1868

2209

if(debug){

1869

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

2210

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

1870

2211

}

1871

2212

1872

2213

/* Cleanup things */

1888

2229

if(gpgme_initialized){

1889

2230

gpgme_release(mc.ctx);

1890

2231

}

1891

2232

1892

2233

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

1893

2234

has seen */

1894

2235

if(mc.current_server != NULL){

1900

2241

}

1901

2242

}

1902

2243

1903

/* Take down the network interface */

1904

if(take_down_interface){

1905

/* Re-raise priviliges */

2244

/* Run network hooks */

2245

run_network_hooks("stop", interface, delay);

2246

2247

/* Re-raise priviliges */

2248

{

1906

2249

errno = 0;

1907

2250

ret = seteuid(0);

1908

2251

if(ret == -1){

1909

2252

perror_plus("seteuid");

1910

2253

}

1911

if(geteuid() == 0){

2254

2255

/* Take down the network interface */

2256

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

1912

2257

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

1913

2258

if(ret == -1){

1914

2259

perror_plus("ioctl SIOCGIFFLAGS");

1915

} else if(network.ifr_flags & IFF_UP) {

2260

} else if(network.ifr_flags & IFF_UP){

1916

2261

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

1917

2262

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

1918

2263

if(ret == -1){

1923

2268

if(ret == -1){

1924

2269

perror_plus("close");

1925

2270

}

1926

/* Lower privileges permanently */

1927

errno = 0;

1928

ret = setuid(uid);

1929

if(ret == -1){

1930

perror_plus("setuid");

1931

}

1932

2271

}

1933

2272

}

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

1934

2279

1935

2280

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

1936

2281

if(tempdir_created){

1937

2282

struct dirent **direntries = NULL;

1938

2283

struct dirent *direntry = NULL;

1939

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1940

if (ret > 0){

1941

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

2284

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

2285

alphasort);

2286

if (numentries > 0){

2287

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

1942

2288

direntry = direntries[i];

1943

2289

char *fullname = NULL;

1944

2290

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

1949

2295

}

1950

2296

ret = remove(fullname);

1951

2297

if(ret == -1){

1952

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

1953

strerror(errno));

2298

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

2299

strerror(errno));

1954

2300

}

1955

2301

free(fullname);

1956

2302

}

1957

2303

}

1958

2304

1959

/* need to be cleaned even if ret == 0 because man page doesn't

1960

specify */

2305

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

1961

2306

free(direntries);

1962

if (ret == -1){

2307

if (numentries == -1){

1963

2308

perror_plus("scandir");

1964

2309

}

1965

2310

ret = rmdir(tempdir);