/mandos/release : revision 237.22.4

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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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13

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*

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

16

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

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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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*/

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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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#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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#ifdef __linux__

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

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115

init_gnutls_session(),

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116

GNUTLS_* */

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117

#include <gnutls/openpgp.h>

111

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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120

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/* GPGME */

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122

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

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

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139

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

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char *connect_to = NULL;

141

const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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144

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

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typedef struct server{

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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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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185

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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;

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va_start (ap, format);

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191

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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}

195

174

196

/*

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197

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

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198

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

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199

* "buffer_length" is how much is already used.

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200

*/

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

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203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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205

if(buffer == NULL){

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211

}

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191

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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, uint16_t port, AvahiIfIndex if_index,

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int af){

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216

int ret;

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

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if(new_server == NULL){

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219

perror_plus("malloc");

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return -1;

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return false;

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221

}

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

202

.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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}

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/* Special case of first server */

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if (mc.current_server == NULL){

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242

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

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243

if(ret == -1){

223

244

perror_plus("clock_gettime");

224

return -1;

245

return false;

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246

}

226

return 0;

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return true;

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}

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229

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/*

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251

* Initialize GPGME.

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252

*/

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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

254

const char *tempdir){

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gpgme_error_t rc;

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256

gpgme_engine_info_t engine_info;

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257

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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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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277

return false;

257

278

}

258

279

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rc = gpgme_op_import(mc.ctx, pgp_data);

260

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if(rc != GPG_ERR_NO_ERROR){

261

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

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gpgme_strsource(rc), gpgme_strerror(rc));

282

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

283

gpgme_strsource(rc), gpgme_strerror(rc));

263

284

return false;

264

285

}

265

286

272

293

}

273

294

274

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if(debug){

275

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

296

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

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297

}

277

298

278

299

/* Init GPGME */

279

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gpgme_check_version(NULL);

280

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

281

302

if(rc != GPG_ERR_NO_ERROR){

282

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

283

gpgme_strsource(rc), gpgme_strerror(rc));

303

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

304

gpgme_strsource(rc), gpgme_strerror(rc));

284

305

return false;

285

306

}

286

307

287

308

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

288

309

rc = gpgme_get_engine_info(&engine_info);

289

310

if(rc != GPG_ERR_NO_ERROR){

290

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

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gpgme_strsource(rc), gpgme_strerror(rc));

311

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

312

gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

293

314

}

294

315

while(engine_info != NULL){

300

321

engine_info = engine_info->next;

301

322

}

302

323

if(engine_info == NULL){

303

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

324

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

325

tempdir);

304

326

return false;

305

327

}

306

328

307

329

/* Create new GPGME "context" */

308

330

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

309

331

if(rc != GPG_ERR_NO_ERROR){

310

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

311

gpgme_strsource(rc), gpgme_strerror(rc));

332

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

333

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

334

gpgme_strerror(rc));

312

335

return false;

313

336

}

314

337

333

356

ssize_t plaintext_length = 0;

334

357

335

358

if(debug){

336

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

359

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

337

360

}

338

361

339

362

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

340

363

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

341

364

0);

342

365

if(rc != GPG_ERR_NO_ERROR){

343

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

344

gpgme_strsource(rc), gpgme_strerror(rc));

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

345

368

return -1;

346

369

}

347

370

348

371

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

349

372

rc = gpgme_data_new(&dh_plain);

350

373

if(rc != GPG_ERR_NO_ERROR){

351

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

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gpgme_strsource(rc), gpgme_strerror(rc));

374

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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gpgme_data_release(dh_crypto);

354

378

return -1;

355

379

}

358

382

data buffer */

359

383

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

360

384

if(rc != GPG_ERR_NO_ERROR){

361

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

362

gpgme_strsource(rc), gpgme_strerror(rc));

385

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

386

gpgme_strsource(rc), gpgme_strerror(rc));

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387

plaintext_length = -1;

364

388

if(debug){

365

389

gpgme_decrypt_result_t result;

366

390

result = gpgme_op_decrypt_result(mc.ctx);

367

391

if(result == NULL){

368

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

392

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

369

393

} else {

370

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

371

result->unsupported_algorithm);

372

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

373

result->wrong_key_usage);

394

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

395

result->unsupported_algorithm);

396

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

397

result->wrong_key_usage);

374

398

if(result->file_name != NULL){

375

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

399

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

376

400

}

377

401

gpgme_recipient_t recipient;

378

402

recipient = result->recipients;

379

403

while(recipient != NULL){

380

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

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

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

383

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

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "No" : "Yes");

404

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

405

gpgme_pubkey_algo_name

406

(recipient->pubkey_algo));

407

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

408

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

409

recipient->status == GPG_ERR_NO_SECKEY

410

? "No" : "Yes");

386

411

recipient = recipient->next;

387

412

}

388

413

}

391

416

}

392

417

393

418

if(debug){

394

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

419

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

395

420

}

396

421

397

422

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

404

429

*plaintext = NULL;

405

430

while(true){

406

431

plaintext_capacity = incbuffer(plaintext,

407

(size_t)plaintext_length,

408

plaintext_capacity);

432

(size_t)plaintext_length,

433

plaintext_capacity);

409

434

if(plaintext_capacity == 0){

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

435

perror_plus("incbuffer");

436

plaintext_length = -1;

437

goto decrypt_end;

413

438

}

414

439

415

440

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

428

453

}

429

454

430

455

if(debug){

431

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

456

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

432

457

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

433

458

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

434

459

}

456

481

/* GnuTLS log function callback */

457

482

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

458

483

const char* string){

459

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

484

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

460

485

}

461

486

462

487

static int init_gnutls_global(const char *pubkeyfilename,

464

489

int ret;

465

490

466

491

if(debug){

467

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

492

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

468

493

}

469

494

470

495

ret = gnutls_global_init();

471

496

if(ret != GNUTLS_E_SUCCESS){

472

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

473

safer_gnutls_strerror(ret));

497

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

498

safer_gnutls_strerror(ret));

474

499

return -1;

475

500

}

476

501

485

510

/* OpenPGP credentials */

486

511

ret = gnutls_certificate_allocate_credentials(&mc.cred);

487

512

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

513

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

514

safer_gnutls_strerror(ret));

490

515

gnutls_global_deinit();

491

516

return -1;

492

517

}

493

518

494

519

if(debug){

495

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

496

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

497

seckeyfilename);

520

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

521

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

522

pubkeyfilename,

523

seckeyfilename);

498

524

}

499

525

500

526

ret = gnutls_certificate_set_openpgp_key_file

501

527

(mc.cred, pubkeyfilename, seckeyfilename,

502

528

GNUTLS_OPENPGP_FMT_BASE64);

503

529

if(ret != GNUTLS_E_SUCCESS){

504

fprintf(stderr,

505

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

506

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

507

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

508

safer_gnutls_strerror(ret));

530

fprintf_plus(stderr,

531

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

532

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

533

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

534

safer_gnutls_strerror(ret));

509

535

goto globalfail;

510

536

}

511

537

512

538

/* GnuTLS server initialization */

513

539

ret = gnutls_dh_params_init(&mc.dh_params);

514

540

if(ret != GNUTLS_E_SUCCESS){

515

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

516

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

541

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

542

" initialization: %s\n",

543

safer_gnutls_strerror(ret));

517

544

goto globalfail;

518

545

}

519

546

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

520

547

if(ret != GNUTLS_E_SUCCESS){

521

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

522

safer_gnutls_strerror(ret));

548

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

549

safer_gnutls_strerror(ret));

523

550

goto globalfail;

524

551

}

525

552

545

572

}

546

573

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

547

574

if(ret != GNUTLS_E_SUCCESS){

548

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

549

safer_gnutls_strerror(ret));

575

fprintf_plus(stderr,

576

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

577

safer_gnutls_strerror(ret));

550

578

}

551

579

552

580

{

559

587

}

560

588

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

561

589

if(ret != GNUTLS_E_SUCCESS){

562

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

563

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

564

safer_gnutls_strerror(ret));

590

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

591

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

592

safer_gnutls_strerror(ret));

565

593

gnutls_deinit(*session);

566

594

return -1;

567

595

}

576

604

}

577

605

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

578

606

if(ret != GNUTLS_E_SUCCESS){

579

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

580

safer_gnutls_strerror(ret));

607

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

608

safer_gnutls_strerror(ret));

581

609

gnutls_deinit(*session);

582

610

return -1;

583

611

}

628

656

pf = PF_INET;

629

657

break;

630

658

default:

631

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

659

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

632

660

errno = EINVAL;

633

661

return -1;

634

662

}

639

667

}

640

668

641

669

if(debug){

642

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

643

"\n", ip, port);

670

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

671

PRIu16 "\n", ip, port);

644

672

}

645

673

646

674

tcp_sd = socket(pf, SOCK_STREAM, 0);

672

700

}

673

701

if(ret == 0){

674

702

int e = errno;

675

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

703

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

676

704

errno = e;

677

705

goto mandos_end;

678

706

}

683

711

684

712

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

685

713

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

686

-Wunreachable-code*/

714

-Wunreachable-code*/

687

715

if(if_index == AVAHI_IF_UNSPEC){

688

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

689

" without a network interface\n");

716

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

717

" incomplete without a network interface\n");

690

718

errno = EINVAL;

691

719

goto mandos_end;

692

720

}

710

738

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

711

739

perror_plus("if_indextoname");

712

740

} else {

713

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

714

ip, interface, port);

741

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

742

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

715

743

}

716

744

} else {

717

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

718

port);

745

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

746

ip, port);

719

747

}

720

748

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

721

749

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

731

759

perror_plus("inet_ntop");

732

760

} else {

733

761

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

734

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

762

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

735

763

}

736

764

}

737

765

}

765

793

while(true){

766

794

size_t out_size = strlen(out);

767

795

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

768

out_size - written));

796

out_size - written));

769

797

if(ret == -1){

770

798

int e = errno;

771

799

perror_plus("write");

791

819

}

792

820

793

821

if(debug){

794

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

822

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

795

823

}

796

824

797

825

if(quit_now){

799

827

goto mandos_end;

800

828

}

801

829

802

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

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

830

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

831

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

832

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

833

gnutls_transport_set_ptr(session,

834

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

804

835

805

836

if(quit_now){

806

837

errno = EINTR;

817

848

818

849

if(ret != GNUTLS_E_SUCCESS){

819

850

if(debug){

820

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

851

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

821

852

gnutls_perror(ret);

822

853

}

823

854

errno = EPROTO;

827

858

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

828

859

829

860

if(debug){

830

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

831

ip);

861

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

862

" %s\n", ip);

832

863

}

833

864

834

865

while(true){

839

870

}

840

871

841

872

buffer_capacity = incbuffer(&buffer, buffer_length,

842

buffer_capacity);

873

buffer_capacity);

843

874

if(buffer_capacity == 0){

844

875

int e = errno;

845

876

perror_plus("incbuffer");

872

903

}

873

904

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

874

905

if(ret < 0){

875

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

906

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

907

"***\n");

876

908

gnutls_perror(ret);

877

909

errno = EPROTO;

878

910

goto mandos_end;

879

911

}

880

912

break;

881

913

default:

882

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

883

" encrypted session with Mandos server\n");

914

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

915

" encrypted session with Mandos server\n");

884

916

gnutls_bye(session, GNUTLS_SHUT_RDWR);

885

917

errno = EIO;

886

918

goto mandos_end;

891

923

}

892

924

893

925

if(debug){

894

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

926

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

895

927

}

896

928

897

929

if(quit_now){

909

941

910

942

if(buffer_length > 0){

911

943

ssize_t decrypted_buffer_size;

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

944

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

914

945

&decrypted_buffer);

915

946

if(decrypted_buffer_size >= 0){

916

947

927

958

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

928

959

int e = errno;

929

960

if(debug){

930

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

931

strerror(errno));

961

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

962

strerror(errno));

932

963

}

933

964

errno = e;

934

965

goto mandos_end;

991

1022

switch(event){

992

1023

default:

993

1024

case AVAHI_RESOLVER_FAILURE:

994

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

995

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

996

avahi_strerror(avahi_server_errno(mc.server)));

1025

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

1026

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

1027

domain,

1028

avahi_strerror(avahi_server_errno(mc.server)));

997

1029

break;

998

1030

999

1031

case AVAHI_RESOLVER_FOUND:

1001

1033

char ip[AVAHI_ADDRESS_STR_MAX];

1002

1034

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

1003

1035

if(debug){

1004

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

1005

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

1006

ip, (intmax_t)interface, port);

1036

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

1037

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

1038

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

1007

1039

}

1008

1040

int ret = start_mandos_communication(ip, port, interface,

1009

1041

avahi_proto_to_af(proto));

1010

1042

if(ret == 0){

1011

1043

avahi_simple_poll_quit(mc.simple_poll);

1012

1044

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1045

if(not add_server(ip, port, interface,

1046

avahi_proto_to_af(proto))){

1047

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

1048

" list\n", name);

1049

}

1015

1050

}

1016

1051

}

1017

1052

}

1041

1076

default:

1042

1077

case AVAHI_BROWSER_FAILURE:

1043

1078

1044

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

1045

avahi_strerror(avahi_server_errno(mc.server)));

1079

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1046

1081

avahi_simple_poll_quit(mc.simple_poll);

1047

1082

return;

1048

1083

1055

1090

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

1056

1091

name, type, domain, protocol, 0,

1057

1092

resolve_callback, NULL) == NULL)

1058

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

1059

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)));

1060

1096

break;

1061

1097

1062

1098

case AVAHI_BROWSER_REMOVE:

1065

1101

case AVAHI_BROWSER_ALL_FOR_NOW:

1066

1102

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1067

1103

if(debug){

1068

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

1104

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

1105

" searching...\n");

1069

1106

}

1070

1107

break;

1071

1108

}

1088

1125

1089

1126

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

1090

1127

int ret;

1128

error_t ret_errno;

1091

1129

1092

1130

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

1093

1131

if(s < 0){

1132

ret_errno = errno;

1094

1133

perror_plus("socket");

1134

errno = ret_errno;

1095

1135

return false;

1096

1136

}

1097

1137

strcpy(ifr->ifr_name, ifname);

1098

1138

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1099

1139

if(ret == -1){

1100

1140

if(debug){

1141

ret_errno = errno;

1101

1142

perror_plus("ioctl SIOCGIFFLAGS");

1143

errno = ret_errno;

1102

1144

}

1103

1145

return false;

1104

1146

}

1110

1152

/* Reject the loopback device */

1111

1153

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

1154

if(debug){

1113

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

1114

ifname);

1155

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

1156

ifname);

1115

1157

}

1116

1158

return false;

1117

1159

}

1118

1160

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

1119

1161

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

1120

1162

if(debug){

1121

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

1122

ifname);

1163

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

1164

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

1123

1165

}

1124

1166

return true;

1125

1167

}

1126

1168

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

1127

1169

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

1128

1170

if(debug){

1129

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

1130

ifname);

1171

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1172

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

1131

1173

}

1132

1174

return false;

1133

1175

}

1134

1176

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

1135

1177

if(ifr->ifr_flags & IFF_NOARP){

1136

1178

if(debug){

1137

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

1179

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

1180

ifname);

1138

1181

}

1139

1182

return false;

1140

1183

}

1141

1184

1142

1185

/* Accept this device */

1143

1186

if(debug){

1144

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

1187

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

1145

1188

}

1146

1189

return true;

1147

1190

}

1159

1202

struct ifreq ifr;

1160

1203

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

1161

1204

if(debug){

1162

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

1163

if_entry->d_name);

1164

}

1165

return 0;

1166

}

1167

1168

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

1169

return 0;

1170

}

1171

return 1;

1172

}

1173

1174

/*

1175

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

1176

* corresponds to an acceptable network device which is up.

1177

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

1178

*/

1179

int up_interface(const struct dirent *if_entry){

1180

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

1181

return 0;

1182

}

1183

1184

struct ifreq ifr;

1185

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

1186

if(debug){

1187

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

1188

if_entry->d_name);

1189

}

1190

return 0;

1191

}

1192

1193

/* Reject down interfaces */

1194

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

1195

if(debug){

1196

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

1197

if_entry->d_name);

1198

}

1199

return 0;

1200

}

1201

1202

/* Reject non-running interfaces */

1203

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

1204

if(debug){

1205

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

1206

if_entry->d_name);

1207

}

1208

return 0;

1209

}

1210

1211

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

1212

return 0;

1213

}

1214

return 1;

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;

1213

}

1214

return 1;

1215

}

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);

1215

1247

}

1216

1248

1217

1249

int notdotentries(const struct dirent *direntry){

1228

1260

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

1229

1261

int runnable_hook(const struct dirent *direntry){

1230

1262

int ret;

1263

size_t sret;

1231

1264

struct stat st;

1232

1265

1233

1266

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

1235

1268

return 0;

1236

1269

}

1237

1270

1238

/* Save pointer to last character */

1239

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

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

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

1247

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

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

ret = stat(direntry->d_name, &st);

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);

1255

1292

if(ret == -1){

1256

1293

if(debug){

1257

perror_plus("Could not stat plugin");

1294

perror_plus("Could not stat hook");

1258

1295

}

1259

1296

return 0;

1260

1297

}

1261

1298

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

1262

1299

/* Not a regular file */

1300

if(debug){

1301

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

1302

direntry->d_name);

1303

}

1263

1304

return 0;

1264

1305

}

1265

1306

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

1266

1307

/* Not executable */

1308

if(debug){

1309

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

1310

direntry->d_name);

1311

}

1267

1312

return 0;

1268

1313

}

1314

if(debug){

1315

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

1316

direntry->d_name);

1317

}

1269

1318

return 1;

1270

1319

}

1271

1320

1278

1327

while(true){

1279

1328

if(mc.current_server == NULL){

1280

1329

if (debug){

1281

fprintf(stderr,

1282

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

1330

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

1331

" No timeout!\n");

1283

1332

}

1284

1333

ret = avahi_simple_poll_iterate(s, -1);

1285

1334

} else {

1286

1335

if (debug){

1287

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

1288

" or wait\n");

1336

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

1337

" it, or wait\n");

1289

1338

}

1290

1339

/* the current time */

1291

1340

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1307

1356

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

1308

1357

1309

1358

if (debug){

1310

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

1359

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

1360

block_time);

1311

1361

}

1312

1362

1313

1363

if(block_time <= 0){

1333

1383

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

1334

1384

}

1335

1385

if(ret != 0){

1336

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

1386

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

1337

1387

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

1338

1388

}

1339

1389

}

1340

1390

}

1341

1391

}

1342

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

1343

1743

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

1344

1744

AvahiSServiceBrowser *sb = NULL;

1345

int error;

1745

error_t ret_errno;

1346

1746

int ret;

1347

1747

intmax_t tmpmax;

1348

1748

char *tmp;

1349

1749

int exitcode = EXIT_SUCCESS;

1350

const char *interface = "";

1351

struct ifreq network;

1352

int sd = -1;

1353

bool take_down_interface = false;

1354

uid_t uid;

1355

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;

1356

1754

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

1357

1755

bool tempdir_created = false;

1358

1756

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1359

1757

const char *seckey = PATHDIR "/" SECKEY;

1360

1758

const char *pubkey = PATHDIR "/" PUBKEY;

1759

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

1361

1761

1362

1762

bool gnutls_initialized = false;

1363

1763

bool gpgme_initialized = false;

1425

1825

.group = 2 },

1426

1826

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

1427

1827

.arg = "SECONDS",

1428

.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",

1429

1833

.group = 2 },

1430

1834

/*

1431

1835

* These reproduce what we would get without ARGP_NO_HELP

1450

1854

connect_to = arg;

1451

1855

break;

1452

1856

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

1453

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

}

1454

1862

break;

1455

1863

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

1456

1864

seckey = arg;

1485

1893

argp_error(state, "Bad retry interval");

1486

1894

}

1487

1895

break;

1896

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

1897

hookdir = arg;

1898

break;

1488

1899

/*

1489

1900

* These reproduce what we would get without ARGP_NO_HELP

1490

1901

*/

1496

1907

argp_state_help(state, state->out_stream,

1497

1908

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1498

1909

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

1499

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

1910

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

1500

1911

exit(argp_err_exit_status);

1501

1912

break;

1502

1913

default:

1529

1940

{

1530

1941

/* Work around Debian bug #633582:

1531

1942

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

1532

struct stat st;

1533

1943

1534

1944

/* Re-raise priviliges */

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

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

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

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

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

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

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

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

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

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

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

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

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1586

}

1587

}

1588

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

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

1594

alphasort);

1595

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

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

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

1612

if(ret == -1){

1613

perror_plus("setenv");

1614

exit(1);

1615

}

1616

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

1617

if(ret == -1){

1618

perror_plus("setenv");

1619

exit(1);

1620

}

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

exit(1);

1625

}

1626

char *delaystring;

1627

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

1628

if(ret == -1){

1629

perror_plus("asprintf");

1630

exit(1);

1631

}

1632

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

1633

if(ret == -1){

1634

free(delaystring);

1635

perror_plus("setenv");

1636

exit(1);

1637

}

1638

free(delaystring);

1639

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

1640

perror_plus("execl");

1641

}

1642

free(fullname);

1643

if(quit_now){

1644

goto end;

1645

}

1646

}

1647

close(devnull);

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;

2027

}

1648

2028

}

1649

2029

1650

2030

if(not debug){

1651

2031

avahi_set_log_function(empty_log);

1652

2032

}

1653

2033

1654

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

1655

struct dirent **direntries;

1656

/* First look for interfaces that are up */

1657

ret = scandir(sys_class_net, &direntries, up_interface,

1658

alphasort);

1659

if(ret == 0){

1660

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

1661

free(direntries);

1662

ret = scandir(sys_class_net, &direntries, good_interface,

1663

alphasort);

1664

}

1665

if(ret >= 1){

1666

/* Pick the first interface returned */

1667

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

1668

if(debug){

1669

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

1670

}

1671

if(interface == NULL){

1672

perror_plus("malloc");

1673

free(direntries);

1674

exitcode = EXIT_FAILURE;

1675

goto end;

1676

}

1677

free(direntries);

1678

} else {

1679

free(direntries);

1680

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

1681

exitcode = EXIT_FAILURE;

1682

goto end;

1683

}

1684

}

1685

1686

2034

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

1687

2035

from the signal handler */

1688

2036

/* Initialize the pseudo-RNG for Avahi */

1689

2037

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

1690

2038

mc.simple_poll = avahi_simple_poll_new();

1691

2039

if(mc.simple_poll == NULL){

1692

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

2040

fprintf_plus(stderr,

2041

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

1693

2042

exitcode = EX_UNAVAILABLE;

1694

2043

goto end;

1695

2044

}

1757

2106

}

1758

2107

}

1759

2108

1760

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

1761

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

1762

if_index = (AvahiIfIndex) if_nametoindex(interface);

1763

if(if_index == 0){

1764

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

1765

exitcode = EX_UNAVAILABLE;

1766

goto end;

1767

}

1768

1769

if(quit_now){

1770

goto end;

1771

}

1772

1773

/* Re-raise priviliges */

1774

errno = 0;

1775

ret = seteuid(0);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1779

1780

#ifdef __linux__

1781

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1782

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

1783

ret = klogctl(8, NULL, 5);

1784

bool restore_loglevel = true;

1785

if(ret == -1){

1786

restore_loglevel = false;

1787

perror_plus("klogctl");

1788

}

1789

#endif /* __linux__ */

1790

1791

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1792

if(sd < 0){

1793

perror_plus("socket");

1794

exitcode = EX_OSERR;

1795

#ifdef __linux__

1796

if(restore_loglevel){

1797

ret = klogctl(7, NULL, 0);

1798

if(ret == -1){

1799

perror_plus("klogctl");

1800

}

1801

}

1802

#endif /* __linux__ */

1803

/* Lower privileges */

1804

errno = 0;

1805

ret = seteuid(uid);

1806

if(ret == -1){

1807

perror_plus("seteuid");

1808

}

1809

goto end;

1810

}

1811

strcpy(network.ifr_name, interface);

1812

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

1813

if(ret == -1){

1814

perror_plus("ioctl SIOCGIFFLAGS");

1815

#ifdef __linux__

1816

if(restore_loglevel){

1817

ret = klogctl(7, NULL, 0);

1818

if(ret == -1){

1819

perror_plus("klogctl");

1820

}

1821

}

1822

#endif /* __linux__ */

1823

exitcode = EX_OSERR;

1824

/* Lower privileges */

1825

errno = 0;

1826

ret = seteuid(uid);

1827

if(ret == -1){

1828

perror_plus("seteuid");

1829

}

1830

goto end;

1831

}

1832

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

1833

network.ifr_flags |= IFF_UP;

1834

take_down_interface = true;

1835

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

1836

if(ret == -1){

1837

take_down_interface = false;

1838

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1839

exitcode = EX_OSERR;

1840

#ifdef __linux__

1841

if(restore_loglevel){

1842

ret = klogctl(7, NULL, 0);

1843

if(ret == -1){

1844

perror_plus("klogctl");

1845

}

1846

}

1847

#endif /* __linux__ */

1848

/* Lower privileges */

1849

errno = 0;

1850

ret = seteuid(uid);

1851

if(ret == -1){

1852

perror_plus("seteuid");

1853

}

1854

goto end;

1855

}

1856

}

1857

/* Sleep checking until interface is running.

1858

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

1859

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

1860

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

1861

if(ret == -1){

1862

perror_plus("ioctl SIOCGIFFLAGS");

1863

} else if(network.ifr_flags & IFF_RUNNING){

1864

break;

1865

}

1866

struct timespec sleeptime = { .tv_nsec = 250000000 };

1867

ret = nanosleep(&sleeptime, NULL);

1868

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

1869

perror_plus("nanosleep");

1870

}

1871

}

1872

if(not take_down_interface){

1873

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

1874

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

1875

if(ret == -1){

1876

perror_plus("close");

1877

}

1878

}

1879

#ifdef __linux__

1880

if(restore_loglevel){

1881

/* Restores kernel loglevel to default */

1882

ret = klogctl(7, NULL, 0);

1883

if(ret == -1){

1884

perror_plus("klogctl");

1885

}

1886

}

1887

#endif /* __linux__ */

1888

/* Lower privileges */

1889

errno = 0;

1890

if(take_down_interface){

1891

/* Lower privileges */

1892

ret = seteuid(uid);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

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);

1896

2130

} else {

1897

/* Lower privileges permanently */

1898

ret = setuid(uid);

1899

if(ret == -1){

1900

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

}

1901

2164

}

1902

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

}

1903

2172

}

1904

2173

1905

2174

if(quit_now){

1908

2177

1909

2178

ret = init_gnutls_global(pubkey, seckey);

1910

2179

if(ret == -1){

1911

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

2180

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

1912

2181

exitcode = EX_UNAVAILABLE;

1913

2182

goto end;

1914

2183

} else {

1930

2199

}

1931

2200

1932

2201

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

1933

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

2202

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

1934

2203

exitcode = EX_UNAVAILABLE;

1935

2204

goto end;

1936

2205

} else {

1945

2214

/* Connect directly, do not use Zeroconf */

1946

2215

/* (Mainly meant for debugging) */

1947

2216

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

2217

1948

2218

if(address == NULL){

1949

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

2219

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

1950

2220

exitcode = EX_USAGE;

1951

2221

goto end;

1952

2222

}

1960

2230

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

1961

2231

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

1962

2232

or tmpmax != (uint16_t)tmpmax){

1963

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

2233

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

1964

2234

exitcode = EX_USAGE;

1965

2235

goto end;

1966

2236

}

1996

2266

break;

1997

2267

}

1998

2268

if(debug){

1999

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

2000

(int)retry_interval);

2269

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

2270

(int)retry_interval);

2001

2271

}

2002

2272

sleep((int)retry_interval);

2003

2273

}

2025

2295

/* Allocate a new server */

2026

2296

mc.server = avahi_server_new(avahi_simple_poll_get

2027

2297

(mc.simple_poll), &config, NULL,

2028

NULL, &error);

2298

NULL, &ret_errno);

2029

2299

2030

2300

/* Free the Avahi configuration data */

2031

2301

avahi_server_config_free(&config);

2033

2303

2034

2304

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

2035

2305

if(mc.server == NULL){

2036

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

2037

avahi_strerror(error));

2306

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

2307

avahi_strerror(ret_errno));

2038

2308

exitcode = EX_UNAVAILABLE;

2039

2309

goto end;

2040

2310

}

2048

2318

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2049

2319

NULL, 0, browse_callback, NULL);

2050

2320

if(sb == NULL){

2051

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

2052

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)));

2053

2323

exitcode = EX_UNAVAILABLE;

2054

2324

goto end;

2055

2325

}

2061

2331

/* Run the main loop */

2062

2332

2063

2333

if(debug){

2064

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

2334

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

2065

2335

}

2066

2336

2067

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

2068

2338

(int)(retry_interval * 1000));

2069

2339

if(debug){

2070

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

2071

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

2340

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

2341

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

2072

2342

}

2073

2343

2074

2344

end:

2075

2345

2076

2346

if(debug){

2077

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

2347

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

2078

2348

}

2079

2349

2080

2350

/* Cleanup things */

2096

2366

if(gpgme_initialized){

2097

2367

gpgme_release(mc.ctx);

2098

2368

}

2099

2369

2100

2370

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

2101

2371

has seen */

2102

2372

if(mc.current_server != NULL){

2108

2378

}

2109

2379

}

2110

2380

2111

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

2112

2113

/* Take down the network interface */

2114

if(take_down_interface){

2115

/* Re-raise priviliges */

2116

errno = 0;

2117

ret = seteuid(0);

2118

if(ret == -1){

2119

perror_plus("seteuid");

2120

}

2121

if(geteuid() == 0){

2122

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

2123

if(ret == -1){

2124

perror_plus("ioctl SIOCGIFFLAGS");

2125

} else if(network.ifr_flags & IFF_UP) {

2126

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

2127

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

2128

if(ret == -1){

2129

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");

2130

2398

}

2131

2399

}

2132

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

2133

if(ret == -1){

2134

perror_plus("close");

2135

}

2136

/* Lower privileges permanently */

2137

errno = 0;

2138

ret = setuid(uid);

2139

if(ret == -1){

2140

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");

2141

2403

}

2142

2404

}

2405

2406

lower_privileges_permanently();

2143

2407

}

2144

2408

2409

free(interfaces_to_take_down);

2410

free(interfaces_hooks);

2411

2145

2412

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

2146

2413

if(tempdir_created){

2147

2414

struct dirent **direntries = NULL;

2160

2427

}

2161

2428

ret = remove(fullname);

2162

2429

if(ret == -1){

2163

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

2164

strerror(errno));

2430

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

2431

strerror(errno));

2165

2432

}

2166

2433

free(fullname);

2167

2434

}