/mandos/trunk : revision 594.1.4

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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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*

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* This file is part of Mandos.

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*

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* Mandos is free software: you can redistribute it and/or modify it

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* under the terms of the GNU General Public License as published by

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* the Free Software Foundation, either version 3 of the License, or

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* (at your option) any later version.

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*

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* Mandos is distributed in the hope that it will be useful, but

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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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* published by the Free Software Foundation, either version 3 of the

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* License, or (at your option) any later version.

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*

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* This program is distributed in the hope that it will be useful, but

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* WITHOUT ANY WARRANTY; without even the implied warranty of

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22

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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* General Public License for more details.

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*

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* You should have received a copy of the GNU General Public License

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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.

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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@recompile.se>.

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*/

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

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#ifndef _LARGEFILE_SOURCE

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34

#define _LARGEFILE_SOURCE

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#endif /* not _LARGEFILE_SOURCE */

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

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

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stdout, ferror() */

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stdout, ferror(), remove() */

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

50

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

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asprintf(), strncpy(), strsignal()

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*/

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

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

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51

#include <sys/ioctl.h> /* ioctl */

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52

#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

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sockaddr_in6, PF_INET6,

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opendir(), DIR */

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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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getnameinfo() */

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

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inet_pton(), connect() */

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

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#include <dirent.h> /* opendir(), struct dirent, readdir()

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61

*/

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62

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

66

63

strtoimax() */

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

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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

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

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66

program_invocation_short_name */

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67

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

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

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73

*/

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74

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

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

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setgid(), pause(), _exit(),

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unlinkat() */

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

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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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79

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

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argp_state, struct argp,

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argz_delete(), argz_append(),

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93

argz_stringify(), argz_add(),

101

94

argz_count() */

102

#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

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EAI_SYSTEM, gai_strerror() */

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105

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#ifdef __linux__

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

148

139

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

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char *connect_to = NULL;

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141

const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

152

142

uid_t uid = 65534;

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143

gid_t gid = 65534;

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144

155

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

156

146

typedef struct server{

157

147

const char *ip;

158

in_port_t port;

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uint16_t port;

159

149

AvahiIfIndex if_index;

160

150

int af;

161

151

struct timespec last_seen;

165

155

166

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

167

157

typedef struct {

158

AvahiSimplePoll *simple_poll;

168

159

AvahiServer *server;

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160

gnutls_certificate_credentials_t cred;

170

161

unsigned int dh_bits;

172

163

const char *priority;

173

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gpgme_ctx_t ctx;

174

165

server *current_server;

175

char *interfaces;

176

size_t interfaces_size;

177

166

} mandos_context;

178

167

179

/* global so signal handler can reach it*/

180

AvahiSimplePoll *simple_poll;

168

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

169

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

181

173

182

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sig_atomic_t quit_now = 0;

183

175

int signal_received = 0;

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perror(print_text);

192

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}

193

185

194

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

186

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

195

187

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

196

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va_list ap;

197

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va_start (ap, format);

198

190

199

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

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program_invocation_short_name));

201

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

193

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

202

194

}

203

195

204

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/*

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

207

199

* "buffer_length" is how much is already used.

208

200

*/

209

__attribute__((nonnull, warn_unused_result))

210

201

size_t incbuffer(char **buffer, size_t buffer_length,

211

202

size_t buffer_capacity){

212

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

213

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

214

if(new_buf == NULL){

215

int old_errno = errno;

216

free(*buffer);

217

errno = old_errno;

218

*buffer = NULL;

204

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

205

if(buffer == NULL){

219

206

return 0;

220

207

}

221

*buffer = new_buf;

222

208

buffer_capacity += BUFFER_SIZE;

223

209

}

224

210

return buffer_capacity;

225

211

}

226

212

227

213

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

228

__attribute__((nonnull, warn_unused_result))

229

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

230

int af, server **current_server){

214

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

215

int af){

231

216

int ret;

232

217

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

233

218

if(new_server == NULL){

240

225

.af = af };

241

226

if(new_server->ip == NULL){

242

227

perror_plus("strdup");

243

free(new_server);

244

return false;

245

}

246

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

247

if(ret == -1){

248

perror_plus("clock_gettime");

249

#ifdef __GNUC__

250

#pragma GCC diagnostic push

251

#pragma GCC diagnostic ignored "-Wcast-qual"

252

#endif

253

free((char *)(new_server->ip));

254

#ifdef __GNUC__

255

#pragma GCC diagnostic pop

256

#endif

257

free(new_server);

258

228

return false;

259

229

}

260

230

/* Special case of first server */

261

if(*current_server == NULL){

231

if (mc.current_server == NULL){

262

232

new_server->next = new_server;

263

233

new_server->prev = new_server;

264

*current_server = new_server;

234

mc.current_server = new_server;

235

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

265

236

} else {

266

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

267

new_server->next = *current_server;

268

new_server->prev = (*current_server)->prev;

237

new_server->next = mc.current_server;

238

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

269

239

new_server->prev->next = new_server;

270

(*current_server)->prev = new_server;

240

mc.current_server->prev = new_server;

241

}

242

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

243

if(ret == -1){

244

perror_plus("clock_gettime");

245

return false;

271

246

}

272

247

return true;

273

248

}

275

250

/*

276

251

* Initialize GPGME.

277

252

*/

278

__attribute__((nonnull, warn_unused_result))

279

static bool init_gpgme(const char * const seckey,

280

const char * const pubkey,

281

const char * const tempdir,

282

mandos_context *mc){

253

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

254

const char *tempdir){

283

255

gpgme_error_t rc;

284

256

gpgme_engine_info_t engine_info;

285

257

258

286

259

/*

287

260

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

288

261

*/

289

bool import_key(const char * const filename){

262

bool import_key(const char *filename){

290

263

int ret;

291

264

int fd;

292

265

gpgme_data_t pgp_data;

304

277

return false;

305

278

}

306

279

307

rc = gpgme_op_import(mc->ctx, pgp_data);

280

rc = gpgme_op_import(mc.ctx, pgp_data);

308

281

if(rc != GPG_ERR_NO_ERROR){

309

282

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

310

283

gpgme_strsource(rc), gpgme_strerror(rc));

311

284

return false;

312

285

}

313

286

314

ret = close(fd);

287

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

315

288

if(ret == -1){

316

289

perror_plus("close");

317

290

}

354

327

}

355

328

356

329

/* Create new GPGME "context" */

357

rc = gpgme_new(&(mc->ctx));

330

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

358

331

if(rc != GPG_ERR_NO_ERROR){

359

332

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

360

333

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

373

346

* Decrypt OpenPGP data.

374

347

* Returns -1 on error

375

348

*/

376

__attribute__((nonnull, warn_unused_result))

377

349

static ssize_t pgp_packet_decrypt(const char *cryptotext,

378

350

size_t crypto_size,

379

char **plaintext,

380

mandos_context *mc){

351

char **plaintext){

381

352

gpgme_data_t dh_crypto, dh_plain;

382

353

gpgme_error_t rc;

383

354

ssize_t ret;

409

380

410

381

/* Decrypt data from the cryptotext data buffer to the plaintext

411

382

data buffer */

412

rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

383

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

413

384

if(rc != GPG_ERR_NO_ERROR){

414

385

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

415

386

gpgme_strsource(rc), gpgme_strerror(rc));

416

387

plaintext_length = -1;

417

388

if(debug){

418

389

gpgme_decrypt_result_t result;

419

result = gpgme_op_decrypt_result(mc->ctx);

390

result = gpgme_op_decrypt_result(mc.ctx);

420

391

if(result == NULL){

421

392

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

422

393

} else {

499

470

return plaintext_length;

500

471

}

501

472

502

__attribute__((warn_unused_result, const))

503

static const char *safe_string(const char *str){

504

if(str == NULL)

505

return "(unknown)";

506

return str;

507

}

508

509

__attribute__((warn_unused_result))

510

static const char *safer_gnutls_strerror(int value){

511

const char *ret = gnutls_strerror(value);

512

return safe_string(ret);

473

static const char * safer_gnutls_strerror(int value){

474

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

475

-Wunreachable-code */

476

if(ret == NULL)

477

ret = "(unknown)";

478

return ret;

513

479

}

514

480

515

481

/* GnuTLS log function callback */

516

__attribute__((nonnull))

517

482

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

518

483

const char* string){

519

484

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

520

485

}

521

486

522

__attribute__((nonnull(1, 2, 4), warn_unused_result))

523

487

static int init_gnutls_global(const char *pubkeyfilename,

524

const char *seckeyfilename,

525

const char *dhparamsfilename,

526

mandos_context *mc){

488

const char *seckeyfilename){

527

489

int ret;

528

unsigned int uret;

529

490

530

491

if(debug){

531

492

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

532

493

}

533

494

495

ret = gnutls_global_init();

496

if(ret != GNUTLS_E_SUCCESS){

497

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

498

safer_gnutls_strerror(ret));

499

return -1;

500

}

501

534

502

if(debug){

535

503

/* "Use a log level over 10 to enable all debugging options."

536

504

* - GnuTLS manual

540

508

}

541

509

542

510

/* OpenPGP credentials */

543

ret = gnutls_certificate_allocate_credentials(&mc->cred);

511

ret = gnutls_certificate_allocate_credentials(&mc.cred);

544

512

if(ret != GNUTLS_E_SUCCESS){

545

513

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

546

514

safer_gnutls_strerror(ret));

515

gnutls_global_deinit();

547

516

return -1;

548

517

}

549

518

555

524

}

556

525

557

526

ret = gnutls_certificate_set_openpgp_key_file

558

(mc->cred, pubkeyfilename, seckeyfilename,

527

(mc.cred, pubkeyfilename, seckeyfilename,

559

528

GNUTLS_OPENPGP_FMT_BASE64);

560

529

if(ret != GNUTLS_E_SUCCESS){

561

530

fprintf_plus(stderr,

567

536

}

568

537

569

538

/* GnuTLS server initialization */

570

ret = gnutls_dh_params_init(&mc->dh_params);

539

ret = gnutls_dh_params_init(&mc.dh_params);

571

540

if(ret != GNUTLS_E_SUCCESS){

572

541

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

573

542

" initialization: %s\n",

574

543

safer_gnutls_strerror(ret));

575

544

goto globalfail;

576

545

}

577

/* If a Diffie-Hellman parameters file was given, try to use it */

578

if(dhparamsfilename != NULL){

579

gnutls_datum_t params = { .data = NULL, .size = 0 };

580

do {

581

int dhpfile = open(dhparamsfilename, O_RDONLY);

582

if(dhpfile == -1){

583

perror_plus("open");

584

dhparamsfilename = NULL;

585

break;

586

}

587

size_t params_capacity = 0;

588

while(true){

589

params_capacity = incbuffer((char **)&params.data,

590

(size_t)params.size,

591

(size_t)params_capacity);

592

if(params_capacity == 0){

593

perror_plus("incbuffer");

594

free(params.data);

595

params.data = NULL;

596

dhparamsfilename = NULL;

597

break;

598

}

599

ssize_t bytes_read = read(dhpfile,

600

params.data + params.size,

601

BUFFER_SIZE);

602

/* EOF */

603

if(bytes_read == 0){

604

break;

605

}

606

/* check bytes_read for failure */

607

if(bytes_read < 0){

608

perror_plus("read");

609

free(params.data);

610

params.data = NULL;

611

dhparamsfilename = NULL;

612

break;

613

}

614

params.size += (unsigned int)bytes_read;

615

}

616

if(params.data == NULL){

617

dhparamsfilename = NULL;

618

}

619

if(dhparamsfilename == NULL){

620

break;

621

}

622

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

623

GNUTLS_X509_FMT_PEM);

624

if(ret != GNUTLS_E_SUCCESS){

625

fprintf_plus(stderr, "Failed to parse DH parameters in file"

626

" \"%s\": %s\n", dhparamsfilename,

627

safer_gnutls_strerror(ret));

628

dhparamsfilename = NULL;

629

}

630

free(params.data);

631

} while(false);

632

}

633

if(dhparamsfilename == NULL){

634

if(mc->dh_bits == 0){

635

/* Find out the optimal number of DH bits */

636

/* Try to read the private key file */

637

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

638

do {

639

int secfile = open(seckeyfilename, O_RDONLY);

640

if(secfile == -1){

641

perror_plus("open");

642

break;

643

}

644

size_t buffer_capacity = 0;

645

while(true){

646

buffer_capacity = incbuffer((char **)&buffer.data,

647

(size_t)buffer.size,

648

(size_t)buffer_capacity);

649

if(buffer_capacity == 0){

650

perror_plus("incbuffer");

651

free(buffer.data);

652

buffer.data = NULL;

653

break;

654

}

655

ssize_t bytes_read = read(secfile,

656

buffer.data + buffer.size,

657

BUFFER_SIZE);

658

/* EOF */

659

if(bytes_read == 0){

660

break;

661

}

662

/* check bytes_read for failure */

663

if(bytes_read < 0){

664

perror_plus("read");

665

free(buffer.data);

666

buffer.data = NULL;

667

break;

668

}

669

buffer.size += (unsigned int)bytes_read;

670

}

671

close(secfile);

672

} while(false);

673

/* If successful, use buffer to parse private key */

674

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

675

if(buffer.data != NULL){

676

{

677

gnutls_openpgp_privkey_t privkey = NULL;

678

ret = gnutls_openpgp_privkey_init(&privkey);

679

if(ret != GNUTLS_E_SUCCESS){

680

fprintf_plus(stderr, "Error initializing OpenPGP key"

681

" structure: %s",

682

safer_gnutls_strerror(ret));

683

free(buffer.data);

684

buffer.data = NULL;

685

} else {

686

ret = gnutls_openpgp_privkey_import

687

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

688

if(ret != GNUTLS_E_SUCCESS){

689

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

690

safer_gnutls_strerror(ret));

691

privkey = NULL;

692

}

693

free(buffer.data);

694

buffer.data = NULL;

695

if(privkey != NULL){

696

/* Use private key to suggest an appropriate

697

sec_param */

698

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

699

gnutls_openpgp_privkey_deinit(privkey);

700

if(debug){

701

fprintf_plus(stderr, "This OpenPGP key implies using"

702

" a GnuTLS security parameter \"%s\".\n",

703

safe_string(gnutls_sec_param_get_name

704

(sec_param)));

705

}

706

}

707

}

708

}

709

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

710

/* Err on the side of caution */

711

sec_param = GNUTLS_SEC_PARAM_ULTRA;

712

if(debug){

713

fprintf_plus(stderr, "Falling back to security parameter"

714

" \"%s\"\n",

715

safe_string(gnutls_sec_param_get_name

716

(sec_param)));

717

}

718

}

719

}

720

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

721

if(uret != 0){

722

mc->dh_bits = uret;

723

if(debug){

724

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

725

" implies %u DH bits; using that.\n",

726

safe_string(gnutls_sec_param_get_name

727

(sec_param)),

728

mc->dh_bits);

729

}

730

} else {

731

fprintf_plus(stderr, "Failed to get implied number of DH"

732

" bits for security parameter \"%s\"): %s\n",

733

safe_string(gnutls_sec_param_get_name

734

(sec_param)),

735

safer_gnutls_strerror(ret));

736

goto globalfail;

737

}

738

} else if(debug){

739

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

740

mc->dh_bits);

741

}

742

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

743

if(ret != GNUTLS_E_SUCCESS){

744

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"

745

" bits): %s\n", mc->dh_bits,

746

safer_gnutls_strerror(ret));

747

goto globalfail;

748

}

749

}

750

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

546

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

547

if(ret != GNUTLS_E_SUCCESS){

548

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

549

safer_gnutls_strerror(ret));

550

goto globalfail;

551

}

552

553

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

751

554

752

555

return 0;

753

556

754

557

globalfail:

755

558

756

gnutls_certificate_free_credentials(mc->cred);

757

gnutls_dh_params_deinit(mc->dh_params);

559

gnutls_certificate_free_credentials(mc.cred);

560

gnutls_global_deinit();

561

gnutls_dh_params_deinit(mc.dh_params);

758

562

return -1;

759

563

}

760

564

761

__attribute__((nonnull, warn_unused_result))

762

static int init_gnutls_session(gnutls_session_t *session,

763

mandos_context *mc){

565

static int init_gnutls_session(gnutls_session_t *session){

764

566

int ret;

765

567

/* GnuTLS session creation */

766

568

do {

778

580

{

779

581

const char *err;

780

582

do {

781

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

583

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

782

584

if(quit_now){

783

585

gnutls_deinit(*session);

784

586

return -1;

795

597

796

598

do {

797

599

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

798

mc->cred);

600

mc.cred);

799

601

if(quit_now){

800

602

gnutls_deinit(*session);

801

603

return -1;

811

613

/* ignore client certificate if any. */

812

614

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

813

615

616

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

617

814

618

return 0;

815

619

}

816

620

818

622

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

819

623

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

820

624

821

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

822

__attribute__((warn_unused_result))

823

int raise_privileges(void){

824

int old_errno = errno;

825

int ret = 0;

826

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

827

ret = errno;

828

}

829

errno = old_errno;

830

return ret;

831

}

832

833

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

834

__attribute__((warn_unused_result))

835

int raise_privileges_permanently(void){

836

int old_errno = errno;

837

int ret = raise_privileges();

838

if(ret != 0){

839

errno = old_errno;

840

return ret;

841

}

842

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

843

ret = errno;

844

}

845

errno = old_errno;

846

return ret;

847

}

848

849

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

850

__attribute__((warn_unused_result))

851

int lower_privileges(void){

852

int old_errno = errno;

853

int ret = 0;

854

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

855

ret = errno;

856

}

857

errno = old_errno;

858

return ret;

859

}

860

861

/* Lower privileges permanently */

862

__attribute__((warn_unused_result))

863

int lower_privileges_permanently(void){

864

int old_errno = errno;

865

int ret = 0;

866

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

867

ret = errno;

868

}

869

errno = old_errno;

870

return ret;

871

}

872

873

/* Helper function to add_local_route() and delete_local_route() */

874

__attribute__((nonnull, warn_unused_result))

875

static bool add_delete_local_route(const bool add,

876

const char *address,

877

AvahiIfIndex if_index){

878

int ret;

879

char helper[] = "mandos-client-iprouteadddel";

880

char add_arg[] = "add";

881

char delete_arg[] = "delete";

882

char debug_flag[] = "--debug";

883

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

884

if(pluginhelperdir == NULL){

885

if(debug){

886

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

887

" variable not set; cannot run helper\n");

888

}

889

return false;

890

}

891

892

char interface[IF_NAMESIZE];

893

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

894

perror_plus("if_indextoname");

895

return false;

896

}

897

898

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

899

if(devnull == -1){

900

perror_plus("open(\"/dev/null\", O_RDONLY)");

901

return false;

902

}

903

pid_t pid = fork();

904

if(pid == 0){

905

/* Child */

906

/* Raise privileges */

907

errno = raise_privileges_permanently();

908

if(errno != 0){

909

perror_plus("Failed to raise privileges");

910

/* _exit(EX_NOPERM); */

911

} else {

912

/* Set group */

913

errno = 0;

914

ret = setgid(0);

915

if(ret == -1){

916

perror_plus("setgid");

917

_exit(EX_NOPERM);

918

}

919

/* Reset supplementary groups */

920

errno = 0;

921

ret = setgroups(0, NULL);

922

if(ret == -1){

923

perror_plus("setgroups");

924

_exit(EX_NOPERM);

925

}

926

}

927

ret = dup2(devnull, STDIN_FILENO);

928

if(ret == -1){

929

perror_plus("dup2(devnull, STDIN_FILENO)");

930

_exit(EX_OSERR);

931

}

932

ret = close(devnull);

933

if(ret == -1){

934

perror_plus("close");

935

_exit(EX_OSERR);

936

}

937

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

938

if(ret == -1){

939

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

940

_exit(EX_OSERR);

941

}

942

int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,

943

O_RDONLY

944

| O_DIRECTORY

945

| O_PATH

946

| O_CLOEXEC));

947

if(helperdir_fd == -1){

948

perror_plus("open");

949

_exit(EX_UNAVAILABLE);

950

}

951

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

952

helper, O_RDONLY));

953

if(helper_fd == -1){

954

perror_plus("openat");

955

close(helperdir_fd);

956

_exit(EX_UNAVAILABLE);

957

}

958

close(helperdir_fd);

959

#ifdef __GNUC__

960

#pragma GCC diagnostic push

961

#pragma GCC diagnostic ignored "-Wcast-qual"

962

#endif

963

if(fexecve(helper_fd, (char *const [])

964

{ helper, add ? add_arg : delete_arg, (char *)address,

965

interface, debug ? debug_flag : NULL, NULL },

966

environ) == -1){

967

#ifdef __GNUC__

968

#pragma GCC diagnostic pop

969

#endif

970

perror_plus("fexecve");

971

_exit(EXIT_FAILURE);

972

}

973

}

974

if(pid == -1){

975

perror_plus("fork");

976

return false;

977

}

978

int status;

979

pid_t pret = -1;

980

errno = 0;

981

do {

982

pret = waitpid(pid, &status, 0);

983

if(pret == -1 and errno == EINTR and quit_now){

984

int errno_raising = 0;

985

if((errno = raise_privileges()) != 0){

986

errno_raising = errno;

987

perror_plus("Failed to raise privileges in order to"

988

" kill helper program");

989

}

990

if(kill(pid, SIGTERM) == -1){

991

perror_plus("kill");

992

}

993

if((errno_raising == 0) and (errno = lower_privileges()) != 0){

994

perror_plus("Failed to lower privileges after killing"

995

" helper program");

996

}

997

return false;

998

}

999

} while(pret == -1 and errno == EINTR);

1000

if(pret == -1){

1001

perror_plus("waitpid");

1002

return false;

1003

}

1004

if(WIFEXITED(status)){

1005

if(WEXITSTATUS(status) != 0){

1006

fprintf_plus(stderr, "Error: iprouteadddel exited"

1007

" with status %d\n", WEXITSTATUS(status));

1008

return false;

1009

}

1010

return true;

1011

}

1012

if(WIFSIGNALED(status)){

1013

fprintf_plus(stderr, "Error: iprouteadddel died by"

1014

" signal %d\n", WTERMSIG(status));

1015

return false;

1016

}

1017

fprintf_plus(stderr, "Error: iprouteadddel crashed\n");

1018

return false;

1019

}

1020

1021

__attribute__((nonnull, warn_unused_result))

1022

static bool add_local_route(const char *address,

1023

AvahiIfIndex if_index){

1024

if(debug){

1025

fprintf_plus(stderr, "Adding route to %s\n", address);

1026

}

1027

return add_delete_local_route(true, address, if_index);

1028

}

1029

1030

__attribute__((nonnull, warn_unused_result))

1031

static bool delete_local_route(const char *address,

1032

AvahiIfIndex if_index){

1033

if(debug){

1034

fprintf_plus(stderr, "Removing route to %s\n", address);

1035

}

1036

return add_delete_local_route(false, address, if_index);

1037

}

1038

1039

625

/* Called when a Mandos server is found */

1040

__attribute__((nonnull, warn_unused_result))

1041

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

626

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

1042

627

AvahiIfIndex if_index,

1043

int af, mandos_context *mc){

628

int af){

1044

629

int ret, tcp_sd = -1;

1045

630

ssize_t sret;

1046

struct sockaddr_storage to;

631

union {

632

struct sockaddr_in in;

633

struct sockaddr_in6 in6;

634

} to;

1047

635

char *buffer = NULL;

1048

636

char *decrypted_buffer = NULL;

1049

637

size_t buffer_length = 0;

1052

640

int retval = -1;

1053

641

gnutls_session_t session;

1054

642

int pf; /* Protocol family */

1055

bool route_added = false;

1056

643

1057

644

errno = 0;

1058

645

1074

661

return -1;

1075

662

}

1076

663

1077

/* If the interface is specified and we have a list of interfaces */

1078

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

1079

/* Check if the interface is one of the interfaces we are using */

1080

bool match = false;

1081

{

1082

char *interface = NULL;

1083

while((interface = argz_next(mc->interfaces,

1084

mc->interfaces_size,

1085

interface))){

1086

if(if_nametoindex(interface) == (unsigned int)if_index){

1087

match = true;

1088

break;

1089

}

1090

}

1091

}

1092

if(not match){

1093

/* This interface does not match any in the list, so we don't

1094

connect to the server */

1095

if(debug){

1096

char interface[IF_NAMESIZE];

1097

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

1098

perror_plus("if_indextoname");

1099

} else {

1100

fprintf_plus(stderr, "Skipping server on non-used interface"

1101

" \"%s\"\n",

1102

if_indextoname((unsigned int)if_index,

1103

interface));

1104

}

1105

}

1106

return -1;

1107

}

1108

}

1109

1110

ret = init_gnutls_session(&session, mc);

664

ret = init_gnutls_session(&session);

1111

665

if(ret != 0){

1112

666

return -1;

1113

667

}

1114

668

1115

669

if(debug){

1116

670

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

1117

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

671

PRIu16 "\n", ip, port);

1118

672

}

1119

673

1120

tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);

674

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

675

if(tcp_sd < 0){

1122

676

int e = errno;

1123

677

perror_plus("socket");

1130

684

goto mandos_end;

1131

685

}

1132

686

687

memset(&to, 0, sizeof(to));

1133

688

if(af == AF_INET6){

1134

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1135

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1136

ret = inet_pton(af, ip, &to6->sin6_addr);

689

to.in6.sin6_family = (sa_family_t)af;

690

ret = inet_pton(af, ip, &to.in6.sin6_addr);

1137

691

} else { /* IPv4 */

1138

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1139

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1140

ret = inet_pton(af, ip, &to4->sin_addr);

692

to.in.sin_family = (sa_family_t)af;

693

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

1141

694

}

1142

695

if(ret < 0 ){

1143

696

int e = errno;

1152

705

goto mandos_end;

1153

706

}

1154

707

if(af == AF_INET6){

1155

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

1156

if(IN6_IS_ADDR_LINKLOCAL

1157

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

708

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

709

-Wconversion and

710

-Wunreachable-code */

711

712

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

713

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

714

-Wunreachable-code*/

1158

715

if(if_index == AVAHI_IF_UNSPEC){

1159

716

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

1160

717

" incomplete without a network interface\n");

1162

719

goto mandos_end;

1163

720

}

1164

721

/* Set the network interface number as scope */

1165

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

722

to.in6.sin6_scope_id = (uint32_t)if_index;

1166

723

}

1167

724

} else {

1168

((struct sockaddr_in *)&to)->sin_port = htons(port);

725

to.in.sin_port = htons(port); /* Spurious warnings from

726

-Wconversion and

727

-Wunreachable-code */

1169

728

}

1170

729

1171

730

if(quit_now){

1179

738

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

1180

739

perror_plus("if_indextoname");

1181

740

} else {

1182

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

1183

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

741

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

742

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

1184

743

}

1185

744

} else {

1186

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

1187

ip, (uintmax_t)port);

745

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

746

ip, port);

1188

747

}

1189

748

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1190

749

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1191

if(af == AF_INET6){

1192

ret = getnameinfo((struct sockaddr *)&to,

1193

sizeof(struct sockaddr_in6),

1194

addrstr, sizeof(addrstr), NULL, 0,

1195

NI_NUMERICHOST);

1196

} else {

1197

ret = getnameinfo((struct sockaddr *)&to,

1198

sizeof(struct sockaddr_in),

1199

addrstr, sizeof(addrstr), NULL, 0,

1200

NI_NUMERICHOST);

1201

}

1202

if(ret == EAI_SYSTEM){

1203

perror_plus("getnameinfo");

1204

} else if(ret != 0) {

1205

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

1206

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

1207

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

1208

}

1209

}

1210

1211

if(quit_now){

1212

errno = EINTR;

1213

goto mandos_end;

1214

}

1215

1216

while(true){

1217

if(af == AF_INET6){

1218

ret = connect(tcp_sd, (struct sockaddr *)&to,

1219

sizeof(struct sockaddr_in6));

1220

} else {

1221

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

1222

sizeof(struct sockaddr_in));

1223

}

1224

if(ret < 0){

1225

if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))

1226

and if_index != AVAHI_IF_UNSPEC

1227

and connect_to == NULL

1228

and not route_added and

1229

((af == AF_INET6 and not

1230

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1231

&to)->sin6_addr)))

1232

or (af == AF_INET and

1233

/* Not a a IPv4LL address */

1234

(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)

1235

& 0xFFFF0000L) != 0xA9FE0000L))){

1236

/* Work around Avahi bug - Avahi does not announce link-local

1237

addresses if it has a global address, so local hosts with

1238

*only* a link-local address (e.g. Mandos clients) cannot

1239

connect to a Mandos server announced by Avahi on a server

1240

host with a global address. Work around this by retrying

1241

with an explicit route added with the server's address.

1242

1243

Avahi bug reference:

1244

https://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1245

https://bugs.debian.org/587961

1246

*/

1247

if(debug){

1248

fprintf_plus(stderr, "Mandos server unreachable, trying"

1249

" direct route\n");

1250

}

1251

int e = errno;

1252

route_added = add_local_route(ip, if_index);

1253

if(route_added){

1254

continue;

1255

}

1256

errno = e;

1257

}

1258

if(errno != ECONNREFUSED or debug){

1259

int e = errno;

1260

perror_plus("connect");

1261

errno = e;

1262

}

1263

goto mandos_end;

1264

}

1265

1266

if(quit_now){

1267

errno = EINTR;

1268

goto mandos_end;

1269

}

1270

break;

750

const char *pcret;

751

if(af == AF_INET6){

752

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

753

sizeof(addrstr));

754

} else {

755

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

756

sizeof(addrstr));

757

}

758

if(pcret == NULL){

759

perror_plus("inet_ntop");

760

} else {

761

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

762

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

763

}

764

}

765

}

766

767

if(quit_now){

768

errno = EINTR;

769

goto mandos_end;

770

}

771

772

if(af == AF_INET6){

773

ret = connect(tcp_sd, &to.in6, sizeof(to));

774

} else {

775

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

776

}

777

if(ret < 0){

778

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

779

int e = errno;

780

perror_plus("connect");

781

errno = e;

782

}

783

goto mandos_end;

784

}

785

786

if(quit_now){

787

errno = EINTR;

788

goto mandos_end;

1271

789

}

1272

790

1273

791

const char *out = mandos_protocol_version;

1424

942

if(buffer_length > 0){

1425

943

ssize_t decrypted_buffer_size;

1426

944

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1427

&decrypted_buffer, mc);

945

&decrypted_buffer);

1428

946

if(decrypted_buffer_size >= 0){

1429

947

1430

clearerr(stdout);

1431

948

written = 0;

1432

949

while(written < (size_t) decrypted_buffer_size){

1433

950

if(quit_now){

1449

966

}

1450

967

written += (size_t)ret;

1451

968

}

1452

ret = fflush(stdout);

1453

if(ret != 0){

1454

int e = errno;

1455

if(debug){

1456

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

1457

strerror(errno));

1458

}

1459

errno = e;

1460

goto mandos_end;

1461

}

1462

969

retval = 0;

1463

970

}

1464

971

}

1467

974

1468

975

mandos_end:

1469

976

{

1470

if(route_added){

1471

if(not delete_local_route(ip, if_index)){

1472

fprintf_plus(stderr, "Failed to delete local route to %s on"

1473

" interface %d", ip, if_index);

1474

}

1475

}

1476

977

int e = errno;

1477

978

free(decrypted_buffer);

1478

979

free(buffer);

1479

980

if(tcp_sd >= 0){

1480

ret = close(tcp_sd);

981

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

1481

982

}

1482

983

if(ret == -1){

1483

984

if(e == 0){

1508

1009

AVAHI_GCC_UNUSED AvahiStringList *txt,

1509

1010

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1510

1011

flags,

1511

void *mc){

1512

if(r == NULL){

1513

return;

1514

}

1012

AVAHI_GCC_UNUSED void* userdata){

1013

assert(r);

1515

1014

1516

1015

/* Called whenever a service has been resolved successfully or

1517

1016

timed out */

1518

1017

1519

1018

if(quit_now){

1520

avahi_s_service_resolver_free(r);

1521

1019

return;

1522

1020

}

1523

1021

1527

1025

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

1528

1026

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

1529

1027

domain,

1530

avahi_strerror(avahi_server_errno

1531

(((mandos_context*)mc)->server)));

1028

avahi_strerror(avahi_server_errno(mc.server)));

1532

1029

break;

1533

1030

1534

1031

case AVAHI_RESOLVER_FOUND:

1540

1037

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

1541

1038

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

1542

1039

}

1543

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

1544

interface,

1545

avahi_proto_to_af(proto),

1546

mc);

1040

int ret = start_mandos_communication(ip, port, interface,

1041

avahi_proto_to_af(proto));

1547

1042

if(ret == 0){

1548

avahi_simple_poll_quit(simple_poll);

1043

avahi_simple_poll_quit(mc.simple_poll);

1549

1044

} else {

1550

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

1551

avahi_proto_to_af(proto),

1552

&((mandos_context*)mc)->current_server)){

1045

if(not add_server(ip, port, interface,

1046

avahi_proto_to_af(proto))){

1553

1047

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

1554

1048

" list\n", name);

1555

1049

}

1568

1062

const char *domain,

1569

1063

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1570

1064

flags,

1571

void *mc){

1572

if(b == NULL){

1573

return;

1574

}

1065

AVAHI_GCC_UNUSED void* userdata){

1066

assert(b);

1575

1067

1576

1068

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

1577

1069

is removed from the LAN */

1585

1077

case AVAHI_BROWSER_FAILURE:

1586

1078

1587

1079

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

1588

avahi_strerror(avahi_server_errno

1589

(((mandos_context*)mc)->server)));

1590

avahi_simple_poll_quit(simple_poll);

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1591

1082

return;

1592

1083

1593

1084

case AVAHI_BROWSER_NEW:

1596

1087

the callback function is called the Avahi server will free the

1597

1088

resolver for us. */

1598

1089

1599

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1600

interface, protocol, name, type,

1601

domain, protocol, 0,

1602

resolve_callback, mc) == NULL)

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1603

1093

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

1604

1094

" %s\n", name,

1605

avahi_strerror(avahi_server_errno

1606

(((mandos_context*)mc)->server)));

1095

avahi_strerror(avahi_server_errno(mc.server)));

1607

1096

break;

1608

1097

1609

1098

case AVAHI_BROWSER_REMOVE:

1628

1117

signal_received = sig;

1629

1118

int old_errno = errno;

1630

1119

/* set main loop to exit */

1631

if(simple_poll != NULL){

1632

avahi_simple_poll_quit(simple_poll);

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1633

1122

}

1634

1123

errno = old_errno;

1635

1124

}

1636

1125

1637

__attribute__((nonnull, warn_unused_result))

1638

1126

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

1639

1127

int ret;

1640

int old_errno;

1128

error_t ret_errno;

1641

1129

1642

1130

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

1643

1131

if(s < 0){

1644

old_errno = errno;

1132

ret_errno = errno;

1645

1133

perror_plus("socket");

1646

errno = old_errno;

1134

errno = ret_errno;

1647

1135

return false;

1648

1136

}

1649

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1650

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1137

strcpy(ifr->ifr_name, ifname);

1651

1138

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1652

1139

if(ret == -1){

1653

1140

if(debug){

1654

old_errno = errno;

1141

ret_errno = errno;

1655

1142

perror_plus("ioctl SIOCGIFFLAGS");

1656

errno = old_errno;

1143

errno = ret_errno;

1657

1144

}

1658

1145

return false;

1659

1146

}

1660

1147

return true;

1661

1148

}

1662

1149

1663

__attribute__((nonnull, warn_unused_result))

1664

1150

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

1665

1151

1666

1152

/* Reject the loopback device */

1708

1194

* corresponds to an acceptable network device.

1709

1195

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

1710

1196

*/

1711

__attribute__((nonnull, warn_unused_result))

1712

1197

int good_interface(const struct dirent *if_entry){

1713

1198

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

1714

1199

return 0;

1732

1217

/*

1733

1218

* This function determines if a network interface is up.

1734

1219

*/

1735

__attribute__((nonnull, warn_unused_result))

1736

1220

bool interface_is_up(const char *interface){

1737

1221

struct ifreq ifr;

1738

1222

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

1749

1233

/*

1750

1234

* This function determines if a network interface is running

1751

1235

*/

1752

__attribute__((nonnull, warn_unused_result))

1753

1236

bool interface_is_running(const char *interface){

1754

1237

struct ifreq ifr;

1755

1238

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

1763

1246

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

1764

1247

}

1765

1248

1766

__attribute__((nonnull, pure, warn_unused_result))

1767

1249

int notdotentries(const struct dirent *direntry){

1768

1250

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

1769

1251

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

1776

1258

}

1777

1259

1778

1260

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

1779

__attribute__((nonnull, warn_unused_result))

1780

1261

int runnable_hook(const struct dirent *direntry){

1781

1262

int ret;

1782

1263

size_t sret;

1790

1271

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

1791

1272

"abcdefghijklmnopqrstuvwxyz"

1792

1273

"0123456789"

1793

"_.-");

1274

"_-");

1794

1275

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

1795

1276

/* Contains non-allowed characters */

1796

1277

if(debug){

1800

1281

return 0;

1801

1282

}

1802

1283

1803

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

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);

1804

1292

if(ret == -1){

1805

1293

if(debug){

1806

1294

perror_plus("Could not stat hook");

1830

1318

return 1;

1831

1319

}

1832

1320

1833

__attribute__((nonnull, warn_unused_result))

1834

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1835

mandos_context *mc){

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1836

1322

int ret;

1837

1323

struct timespec now;

1838

1324

struct timespec waited_time;

1839

1325

intmax_t block_time;

1840

1326

1841

1327

while(true){

1842

if(mc->current_server == NULL){

1843

if(debug){

1328

if(mc.current_server == NULL){

1329

if (debug){

1844

1330

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

1845

1331

" No timeout!\n");

1846

1332

}

1847

1333

ret = avahi_simple_poll_iterate(s, -1);

1848

1334

} else {

1849

if(debug){

1335

if (debug){

1850

1336

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

1851

1337

" it, or wait\n");

1852

1338

}

1859

1345

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

1860

1346

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

1861

1347

waited_time.tv_sec = (now.tv_sec

1862

- mc->current_server->last_seen.tv_sec);

1348

- mc.current_server->last_seen.tv_sec);

1863

1349

waited_time.tv_nsec = (now.tv_nsec

1864

- mc->current_server->last_seen.tv_nsec);

1350

- mc.current_server->last_seen.tv_nsec);

1865

1351

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

1866

1352

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

1867

1353

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

1869

1355

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

1870

1356

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

1871

1357

1872

if(debug){

1358

if (debug){

1873

1359

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

1874

1360

block_time);

1875

1361

}

1876

1362

1877

1363

if(block_time <= 0){

1878

ret = start_mandos_communication(mc->current_server->ip,

1879

mc->current_server->port,

1880

mc->current_server->if_index,

1881

mc->current_server->af, mc);

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1882

1368

if(ret == 0){

1883

avahi_simple_poll_quit(s);

1369

avahi_simple_poll_quit(mc.simple_poll);

1884

1370

return 0;

1885

1371

}

1886

1372

ret = clock_gettime(CLOCK_MONOTONIC,

1887

&mc->current_server->last_seen);

1373

&mc.current_server->last_seen);

1888

1374

if(ret == -1){

1889

1375

perror_plus("clock_gettime");

1890

1376

return -1;

1891

1377

}

1892

mc->current_server = mc->current_server->next;

1378

mc.current_server = mc.current_server->next;

1893

1379

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

1894

1380

servers, but don't block */

1895

1381

}

1897

1383

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

1898

1384

}

1899

1385

if(ret != 0){

1900

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

1386

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

1901

1387

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

1902

1388

}

1903

1389

}

1904

1390

}

1905

1391

}

1906

1392

1907

__attribute__((nonnull))

1908

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

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,

1909

1446

const float delay){

1910

struct dirent **direntries = NULL;

1911

if(hookdir_fd == -1){

1912

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1913

| O_CLOEXEC);

1914

if(hookdir_fd == -1){

1915

if(errno == ENOENT){

1916

if(debug){

1917

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1918

" found\n", hookdir);

1919

}

1920

} else {

1921

perror_plus("open");

1922

}

1923

return;

1924

}

1925

}

1926

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1927

runnable_hook, alphasort);

1447

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

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

1451

alphasort);

1928

1452

if(numhooks == -1){

1929

1453

perror_plus("scandir");

1930

return;

1931

}

1932

struct dirent *direntry;

1933

int ret;

1934

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

1935

if(devnull == -1){

1936

perror_plus("open(\"/dev/null\", O_RDONLY)");

1937

return;

1938

}

1939

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

1940

direntry = direntries[i];

1941

if(debug){

1942

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

1943

direntry->d_name);

1944

}

1945

pid_t hook_pid = fork();

1946

if(hook_pid == 0){

1947

/* Child */

1948

/* Raise privileges */

1949

errno = raise_privileges_permanently();

1950

if(errno != 0){

1951

perror_plus("Failed to raise privileges");

1952

_exit(EX_NOPERM);

1953

}

1954

/* Set group */

1955

errno = 0;

1956

ret = setgid(0);

1957

if(ret == -1){

1958

perror_plus("setgid");

1959

_exit(EX_NOPERM);

1960

}

1961

/* Reset supplementary groups */

1962

errno = 0;

1963

ret = setgroups(0, NULL);

1964

if(ret == -1){

1965

perror_plus("setgroups");

1966

_exit(EX_NOPERM);

1967

}

1968

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

1969

if(ret == -1){

1970

perror_plus("setenv");

1971

_exit(EX_OSERR);

1972

}

1973

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

1974

if(ret == -1){

1975

perror_plus("setenv");

1976

_exit(EX_OSERR);

1977

}

1978

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

1979

if(ret == -1){

1980

perror_plus("setenv");

1981

_exit(EX_OSERR);

1982

}

1983

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

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

char *delaystring;

1989

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

1990

if(ret == -1){

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){

1991

1461

perror_plus("asprintf");

1992

_exit(EX_OSERR);

1993

}

1994

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

1995

if(ret == -1){

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

}

1996

1520

free(delaystring);

1997

perror_plus("setenv");

1998

_exit(EX_OSERR);

1999

}

2000

free(delaystring);

2001

if(connect_to != NULL){

2002

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

2003

if(ret == -1){

2004

perror_plus("setenv");

2005

_exit(EX_OSERR);

2006

}

2007

}

2008

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

2009

direntry->d_name,

2010

O_RDONLY));

2011

if(hook_fd == -1){

2012

perror_plus("openat");

2013

_exit(EXIT_FAILURE);

2014

}

2015

if(close(hookdir_fd) == -1){

2016

perror_plus("close");

2017

_exit(EXIT_FAILURE);

2018

}

2019

ret = dup2(devnull, STDIN_FILENO);

2020

if(ret == -1){

2021

perror_plus("dup2(devnull, STDIN_FILENO)");

2022

_exit(EX_OSERR);

2023

}

2024

ret = close(devnull);

2025

if(ret == -1){

2026

perror_plus("close");

2027

_exit(EX_OSERR);

2028

}

2029

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2030

if(ret == -1){

2031

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

2032

_exit(EX_OSERR);

2033

}

2034

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

2035

environ) == -1){

2036

perror_plus("fexecve");

2037

_exit(EXIT_FAILURE);

2038

}

2039

} else {

2040

if(hook_pid == -1){

2041

perror_plus("fork");

2042

free(direntry);

2043

continue;

2044

}

2045

int status;

2046

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

2047

perror_plus("waitpid");

2048

free(direntry);

2049

continue;

2050

}

2051

if(WIFEXITED(status)){

2052

if(WEXITSTATUS(status) != 0){

2053

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

2054

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

2055

WEXITSTATUS(status));

2056

free(direntry);

2057

continue;

2058

}

2059

} else if(WIFSIGNALED(status)){

2060

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

2061

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

2062

WTERMSIG(status));

2063

free(direntry);

2064

continue;

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

}

2065

1532

} else {

2066

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

2067

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

2068

free(direntry);

2069

continue;

2070

}

2071

}

2072

if(debug){

2073

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

2074

direntry->d_name);

2075

}

2076

free(direntry);

2077

}

2078

free(direntries);

2079

if(close(hookdir_fd) == -1){

2080

perror_plus("close");

2081

} else {

2082

hookdir_fd = -1;

2083

}

2084

close(devnull);

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;

2085

1569

}

2086

1570

2087

__attribute__((nonnull, warn_unused_result))

2088

int bring_up_interface(const char *const interface,

2089

const float delay){

2090

int old_errno = errno;

2091

int ret;

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;

2092

1577

struct ifreq network;

2093

1578

unsigned int if_index = if_nametoindex(interface);

2094

1579

if(if_index == 0){

2103

1588

}

2104

1589

2105

1590

if(not interface_is_up(interface)){

2106

int ret_errno = 0;

2107

int ioctl_errno = 0;

2108

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

1591

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

2109

1592

ret_errno = errno;

2110

1593

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

2111

1594

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

2112

errno = old_errno;

2113

1595

return ret_errno;

2114

1596

}

2115

network.ifr_flags |= IFF_UP; /* set flag */

1597

network.ifr_flags |= IFF_UP;

2116

1598

2117

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

2118

if(sd == -1){

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

2119

1601

ret_errno = errno;

2120

1602

perror_plus("socket");

2121

1603

errno = old_errno;

2122

1604

return ret_errno;

2123

1605

}

2124

1606

2125

1607

if(quit_now){

2126

ret = close(sd);

2127

if(ret == -1){

2128

perror_plus("close");

2129

}

1608

close(sd);

2130

1609

errno = old_errno;

2131

1610

return EINTR;

2132

1611

}

2136

1615

interface);

2137

1616

}

2138

1617

2139

/* Raise privileges */

2140

ret_errno = raise_privileges();

2141

if(ret_errno != 0){

2142

errno = ret_errno;

2143

perror_plus("Failed to raise privileges");

2144

}

1618

/* Raise priviliges */

1619

raise_privileges();

2145

1620

2146

1621

#ifdef __linux__

2147

int ret_linux;

2148

bool restore_loglevel = false;

2149

if(ret_errno == 0){

2150

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2151

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

2152

ret_linux = klogctl(8, NULL, 5);

2153

if(ret_linux == -1){

2154

perror_plus("klogctl");

2155

} else {

2156

restore_loglevel = true;

2157

}

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");

2158

1629

}

2159

1630

#endif /* __linux__ */

2160

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

2161

ioctl_errno = errno;

1631

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

1632

ret_errno = errno;

2162

1633

#ifdef __linux__

2163

1634

if(restore_loglevel){

2164

1635

ret_linux = klogctl(7, NULL, 0);

2168

1639

}

2169

1640

#endif /* __linux__ */

2170

1641

2171

/* If raise_privileges() succeeded above */

2172

if(ret_errno == 0){

2173

/* Lower privileges */

2174

ret_errno = lower_privileges();

2175

if(ret_errno != 0){

2176

errno = ret_errno;

2177

perror_plus("Failed to lower privileges");

2178

}

2179

}

1642

/* Lower privileges */

1643

lower_privileges();

2180

1644

2181

1645

/* Close the socket */

2182

ret = close(sd);

1646

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

2183

1647

if(ret == -1){

2184

1648

perror_plus("close");

2185

1649

}

2186

1650

2187

1651

if(ret_setflags == -1){

2188

errno = ioctl_errno;

1652

errno = ret_errno;

2189

1653

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2190

1654

errno = old_errno;

2191

return ioctl_errno;

1655

return ret_errno;

2192

1656

}

2193

1657

} else if(debug){

2194

1658

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

2197

1661

2198

1662

/* Sleep checking until interface is running.

2199

1663

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

2200

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

1664

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

2201

1665

if(interface_is_running(interface)){

2202

1666

break;

2203

1667

}

2212

1676

return 0;

2213

1677

}

2214

1678

2215

__attribute__((nonnull, warn_unused_result))

2216

int take_down_interface(const char *const interface){

2217

int old_errno = errno;

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;

2218

1684

struct ifreq network;

2219

1685

unsigned int if_index = if_nametoindex(interface);

2220

1686

if(if_index == 0){

2223

1689

return ENXIO;

2224

1690

}

2225

1691

if(interface_is_up(interface)){

2226

int ret_errno = 0;

2227

int ioctl_errno = 0;

2228

1692

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

2229

1693

ret_errno = errno;

2230

1694

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

2231

1695

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

2232

errno = old_errno;

2233

1696

return ret_errno;

2234

1697

}

2235

1698

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

2236

1699

2237

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

2238

if(sd == -1){

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

2239

1702

ret_errno = errno;

2240

1703

perror_plus("socket");

2241

1704

errno = old_errno;

2247

1710

interface);

2248

1711

}

2249

1712

2250

/* Raise privileges */

2251

ret_errno = raise_privileges();

2252

if(ret_errno != 0){

2253

errno = ret_errno;

2254

perror_plus("Failed to raise privileges");

2255

}

2256

2257

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

2258

ioctl_errno = errno;

2259

2260

/* If raise_privileges() succeeded above */

2261

if(ret_errno == 0){

2262

/* Lower privileges */

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2266

perror_plus("Failed to lower privileges");

2267

}

2268

}

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();

2269

1721

2270

1722

/* Close the socket */

2271

int ret = close(sd);

1723

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

2272

1724

if(ret == -1){

2273

1725

perror_plus("close");

2274

1726

}

2275

1727

2276

1728

if(ret_setflags == -1){

2277

errno = ioctl_errno;

1729

errno = ret_errno;

2278

1730

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2279

1731

errno = old_errno;

2280

return ioctl_errno;

1732

return ret_errno;

2281

1733

}

2282

1734

} else if(debug){

2283

1735

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

2289

1741

}

2290

1742

2291

1743

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

2292

mandos_context mc = { .server = NULL, .dh_bits = 0,

2293

.priority = "SECURE256:!CTYPE-X.509"

2294

":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",

2295

.current_server = NULL, .interfaces = NULL,

2296

.interfaces_size = 0 };

2297

1744

AvahiSServiceBrowser *sb = NULL;

2298

1745

error_t ret_errno;

2299

1746

int ret;

2300

1747

intmax_t tmpmax;

2301

1748

char *tmp;

2302

1749

int exitcode = EXIT_SUCCESS;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

2303

1752

char *interfaces_to_take_down = NULL;

2304

1753

size_t interfaces_to_take_down_size = 0;

2305

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

2306

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

2307

char *tempdir = NULL;

1754

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

1755

bool tempdir_created = false;

2308

1756

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2309

1757

const char *seckey = PATHDIR "/" SECKEY;

2310

1758

const char *pubkey = PATHDIR "/" PUBKEY;

2311

const char *dh_params_file = NULL;

2312

1759

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

2313

1761

2314

1762

bool gnutls_initialized = false;

2315

1763

bool gpgme_initialized = false;

2367

1815

.doc = "Bit length of the prime number used in the"

2368

1816

" Diffie-Hellman key exchange",

2369

1817

.group = 2 },

2370

{ .name = "dh-params", .key = 134,

2371

.arg = "FILE",

2372

.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"

2373

" for the Diffie-Hellman key exchange",

2374

.group = 2 },

2375

1818

{ .name = "priority", .key = 130,

2376

1819

.arg = "STRING",

2377

1820

.doc = "GnuTLS priority string for the TLS handshake",

2411

1854

connect_to = arg;

2412

1855

break;

2413

1856

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

2414

ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,

2415

arg, (int)',');

1857

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

1858

(int)',');

2416

1859

if(ret_errno != 0){

2417

1860

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

2418

1861

}

2432

1875

}

2433

1876

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

2434

1877

break;

2435

case 134: /* --dh-params */

2436

dh_params_file = arg;

2437

break;

2438

1878

case 130: /* --priority */

2439

1879

mc.priority = arg;

2440

1880

break;

2480

1920

.args_doc = "",

2481

1921

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

2482

1922

" passwords from a Mandos server" };

2483

ret_errno = argp_parse(&argp, argc, argv,

2484

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2485

switch(ret_errno){

1923

ret = argp_parse(&argp, argc, argv,

1924

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1925

switch(ret){

2486

1926

case 0:

2487

1927

break;

2488

1928

case ENOMEM:

2489

1929

default:

2490

errno = ret_errno;

1930

errno = ret;

2491

1931

perror_plus("argp_parse");

2492

1932

exitcode = EX_OSERR;

2493

1933

goto end;

2496

1936

goto end;

2497

1937

}

2498

1938

}

2499

1939

2500

1940

{

2501

1941

/* Work around Debian bug #633582:

2502

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

1942

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

2503

1943

2504

/* Re-raise privileges */

2505

ret = raise_privileges();

2506

if(ret != 0){

2507

errno = ret;

2508

perror_plus("Failed to raise privileges");

2509

} else {

1944

/* Re-raise priviliges */

1945

if(raise_privileges() == 0){

2510

1946

struct stat st;

2511

1947

2512

1948

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

2526

1962

}

2527

1963

}

2528

1964

}

2529

close(seckey_fd);

1965

TEMP_FAILURE_RETRY(close(seckey_fd));

2530

1966

}

2531

1967

}

2532

1968

2533

1969

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

2534

1970

int pubkey_fd = open(pubkey, O_RDONLY);

2535

1971

if(pubkey_fd == -1){

2547

1983

}

2548

1984

}

2549

1985

}

2550

close(pubkey_fd);

2551

}

2552

}

2553

2554

if(dh_params_file != NULL

2555

and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2556

int dhparams_fd = open(dh_params_file, O_RDONLY);

2557

if(dhparams_fd == -1){

2558

perror_plus("open");

2559

} else {

2560

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

2561

if(ret == -1){

2562

perror_plus("fstat");

2563

} else {

2564

if(S_ISREG(st.st_mode)

2565

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

2566

ret = fchown(dhparams_fd, uid, gid);

2567

if(ret == -1){

2568

perror_plus("fchown");

2569

}

2570

}

2571

}

2572

close(dhparams_fd);

2573

}

2574

}

2575

1986

TEMP_FAILURE_RETRY(close(pubkey_fd));

1987

}

1988

}

1989

2576

1990

/* Lower privileges */

2577

ret = lower_privileges();

2578

if(ret != 0){

2579

errno = ret;

2580

perror_plus("Failed to lower privileges");

1991

errno = 0;

1992

ret = seteuid(uid);

1993

if(ret == -1){

1994

perror_plus("seteuid");

2581

1995

}

2582

1996

}

2583

1997

}

2584

1998

2585

/* Remove invalid interface names (except "none") */

1999

/* Remove empty interface names */

2586

2000

{

2587

2001

char *interface = NULL;

2588

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2002

while((interface = argz_next(interfaces, interfaces_size,

2589

2003

interface))){

2590

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

2591

and if_nametoindex(interface) == 0){

2592

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

2004

if(if_nametoindex(interface) == 0){

2005

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

2593

2006

fprintf_plus(stderr, "Not using nonexisting interface"

2594

2007

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

2595

2008

}

2596

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2009

argz_delete(&interfaces, &interfaces_size, interface);

2597

2010

interface = NULL;

2598

2011

}

2599

2012

}

2601

2014

2602

2015

/* Run network hooks */

2603

2016

{

2604

if(mc.interfaces != NULL){

2605

interfaces_hooks = malloc(mc.interfaces_size);

2606

if(interfaces_hooks == NULL){

2607

perror_plus("malloc");

2608

goto end;

2609

}

2610

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2611

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2612

}

2613

run_network_hooks("start", interfaces_hooks != NULL ?

2614

interfaces_hooks : "", delay);

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

}

2615

2028

}

2616

2029

2617

2030

if(not debug){

2622

2035

from the signal handler */

2623

2036

/* Initialize the pseudo-RNG for Avahi */

2624

2037

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

2625

simple_poll = avahi_simple_poll_new();

2626

if(simple_poll == NULL){

2038

mc.simple_poll = avahi_simple_poll_new();

2039

if(mc.simple_poll == NULL){

2627

2040

fprintf_plus(stderr,

2628

2041

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

2629

2042

exitcode = EX_UNAVAILABLE;

2694

2107

}

2695

2108

2696

2109

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

2697

if(mc.interfaces == NULL){

2698

struct dirent **direntries = NULL;

2110

if(interfaces == NULL){

2111

struct dirent **direntries;

2699

2112

/* Look for any good interfaces */

2700

2113

ret = scandir(sys_class_net, &direntries, good_interface,

2701

2114

alphasort);

2702

2115

if(ret >= 1){

2703

2116

/* Add all found interfaces to interfaces list */

2704

2117

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

2705

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2706

2119

direntries[i]->d_name);

2707

2120

if(ret_errno != 0){

2708

errno = ret_errno;

2709

2121

perror_plus("argz_add");

2710

free(direntries[i]);

2711

2122

continue;

2712

2123

}

2713

2124

if(debug){

2714

2125

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

2715

2126

direntries[i]->d_name);

2716

2127

}

2717

free(direntries[i]);

2718

2128

}

2719

2129

free(direntries);

2720

2130

} else {

2721

if(ret == 0){

2722

free(direntries);

2723

}

2131

free(direntries);

2724

2132

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

2725

2133

exitcode = EXIT_FAILURE;

2726

2134

goto end;

2727

2135

}

2728

2136

}

2729

2137

2730

/* Bring up interfaces which are down, and remove any "none"s */

2731

{

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)){

2732

2150

char *interface = NULL;

2733

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2151

while((interface = argz_next(interfaces, interfaces_size,

2734

2152

interface))){

2735

/* If interface name is "none", stop bringing up interfaces.

2736

Also remove all instances of "none" from the list */

2737

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

2738

argz_delete(&mc.interfaces, &mc.interfaces_size,

2739

interface);

2740

interface = NULL;

2741

while((interface = argz_next(mc.interfaces,

2742

mc.interfaces_size, interface))){

2743

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

2744

argz_delete(&mc.interfaces, &mc.interfaces_size,

2745

interface);

2746

interface = NULL;

2747

}

2748

}

2749

break;

2750

}

2751

2153

bool interface_was_up = interface_is_up(interface);

2752

errno = bring_up_interface(interface, delay);

2154

ret = bring_up_interface(interface, delay);

2753

2155

if(not interface_was_up){

2754

if(errno != 0){

2755

fprintf_plus(stderr, "Failed to bring up interface \"%s\":"

2756

" %s\n", interface, strerror(errno));

2156

if(ret != 0){

2157

errno = ret;

2158

perror_plus("Failed to bring up interface");

2757

2159

} else {

2758

errno = argz_add(&interfaces_to_take_down,

2759

&interfaces_to_take_down_size,

2760

interface);

2761

if(errno != 0){

2762

perror_plus("argz_add");

2763

}

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2764

2163

}

2765

2164

}

2766

2165

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2767

2169

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

2768

2170

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

2769

2171

}

2770

2172

}

2771

2173

2772

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

2773

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

2774

if(debug){

2775

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

2776

mc.interfaces);

2777

}

2778

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

2779

}

2780

2781

2174

if(quit_now){

2782

2175

goto end;

2783

2176

}

2784

2177

2785

ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);

2178

ret = init_gnutls_global(pubkey, seckey);

2786

2179

if(ret == -1){

2787

2180

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

2788

2181

exitcode = EX_UNAVAILABLE;

2795

2188

goto end;

2796

2189

}

2797

2190

2798

/* Try /run/tmp before /tmp */

2799

tempdir = mkdtemp(run_tempdir);

2800

if(tempdir == NULL and errno == ENOENT){

2801

if(debug){

2802

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2803

run_tempdir, old_tempdir);

2804

}

2805

tempdir = mkdtemp(old_tempdir);

2806

}

2807

if(tempdir == NULL){

2191

if(mkdtemp(tempdir) == NULL){

2808

2192

perror_plus("mkdtemp");

2809

2193

goto end;

2810

2194

}

2195

tempdir_created = true;

2811

2196

2812

2197

if(quit_now){

2813

2198

goto end;

2814

2199

}

2815

2200

2816

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

2201

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

2817

2202

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

2818

2203

exitcode = EX_UNAVAILABLE;

2819

2204

goto end;

2840

2225

goto end;

2841

2226

}

2842

2227

2843

in_port_t port;

2228

uint16_t port;

2844

2229

errno = 0;

2845

2230

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

2846

2231

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

2847

or tmpmax != (in_port_t)tmpmax){

2232

or tmpmax != (uint16_t)tmpmax){

2848

2233

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

2849

2234

exitcode = EX_USAGE;

2850

2235

goto end;

2851

2236

}

2852

2237

2853

2238

if(quit_now){

2854

2239

goto end;

2855

2240

}

2856

2241

2857

port = (in_port_t)tmpmax;

2242

port = (uint16_t)tmpmax;

2858

2243

*address = '\0';

2859

2244

/* Colon in address indicates IPv6 */

2860

2245

int af;

2876

2261

}

2877

2262

2878

2263

while(not quit_now){

2879

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

2880

&mc);

2264

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

2881

2265

if(quit_now or ret == 0){

2882

2266

break;

2883

2267

}

2885

2269

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

2886

2270

(int)retry_interval);

2887

2271

}

2888

sleep((unsigned int)retry_interval);

2272

sleep((int)retry_interval);

2889

2273

}

2890

2274

2891

if(not quit_now){

2275

if (not quit_now){

2892

2276

exitcode = EXIT_SUCCESS;

2893

2277

}

2894

2278

2909

2293

config.publish_domain = 0;

2910

2294

2911

2295

/* Allocate a new server */

2912

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2913

&config, NULL, NULL, &ret);

2296

mc.server = avahi_server_new(avahi_simple_poll_get

2297

(mc.simple_poll), &config, NULL,

2298

NULL, &ret_errno);

2914

2299

2915

2300

/* Free the Avahi configuration data */

2916

2301

avahi_server_config_free(&config);

2919

2304

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

2920

2305

if(mc.server == NULL){

2921

2306

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

2922

avahi_strerror(ret));

2307

avahi_strerror(ret_errno));

2923

2308

exitcode = EX_UNAVAILABLE;

2924

2309

goto end;

2925

2310

}

2931

2316

/* Create the Avahi service browser */

2932

2317

sb = avahi_s_service_browser_new(mc.server, if_index,

2933

2318

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2934

NULL, 0, browse_callback,

2935

(void *)&mc);

2319

NULL, 0, browse_callback, NULL);

2936

2320

if(sb == NULL){

2937

2321

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

2938

2322

avahi_strerror(avahi_server_errno(mc.server)));

2949

2333

if(debug){

2950

2334

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

2951

2335

}

2952

2953

ret = avahi_loop_with_timeout(simple_poll,

2954

(int)(retry_interval * 1000), &mc);

2336

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

2338

(int)(retry_interval * 1000));

2955

2339

if(debug){

2956

2340

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

2957

2341

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

2960

2344

end:

2961

2345

2962

2346

if(debug){

2963

if(signal_received){

2964

fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",

2965

argv[0], signal_received,

2966

strsignal(signal_received));

2967

} else {

2968

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

2969

}

2347

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

2970

2348

}

2971

2349

2972

2350

/* Cleanup things */

2973

free(mc.interfaces);

2974

2975

2351

if(sb != NULL)

2976

2352

avahi_s_service_browser_free(sb);

2977

2353

2978

2354

if(mc.server != NULL)

2979

2355

avahi_server_free(mc.server);

2980

2356

2981

if(simple_poll != NULL)

2982

avahi_simple_poll_free(simple_poll);

2357

if(mc.simple_poll != NULL)

2358

avahi_simple_poll_free(mc.simple_poll);

2983

2359

2984

2360

if(gnutls_initialized){

2985

2361

gnutls_certificate_free_credentials(mc.cred);

2362

gnutls_global_deinit();

2986

2363

gnutls_dh_params_deinit(mc.dh_params);

2987

2364

}

2988

2365

2996

2373

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

2997

2374

while(mc.current_server != NULL){

2998

2375

server *next = mc.current_server->next;

2999

#ifdef __GNUC__

3000

#pragma GCC diagnostic push

3001

#pragma GCC diagnostic ignored "-Wcast-qual"

3002

#endif

3003

free((char *)(mc.current_server->ip));

3004

#ifdef __GNUC__

3005

#pragma GCC diagnostic pop

3006

#endif

3007

2376

free(mc.current_server);

3008

2377

mc.current_server = next;

3009

2378

}

3010

2379

}

3011

2380

3012

/* Re-raise privileges */

2381

/* Re-raise priviliges */

3013

2382

{

3014

ret = raise_privileges();

3015

if(ret != 0){

3016

errno = ret;

3017

perror_plus("Failed to raise privileges");

3018

} else {

3019

3020

/* Run network hooks */

3021

run_network_hooks("stop", interfaces_hooks != NULL ?

3022

interfaces_hooks : "", delay);

3023

3024

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

3025

{

3026

char *interface = NULL;

3027

while((interface = argz_next(interfaces_to_take_down,

3028

interfaces_to_take_down_size,

3029

interface))){

3030

ret = take_down_interface(interface);

3031

if(ret != 0){

3032

errno = ret;

3033

perror_plus("Failed to take down interface");

3034

}

3035

}

3036

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

3037

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

3038

" down\n");

3039

}

3040

}

3041

}

3042

3043

ret = lower_privileges_permanently();

3044

if(ret != 0){

3045

errno = ret;

3046

perror_plus("Failed to lower privileges permanently");

3047

}

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");

2398

}

2399

}

2400

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

2401

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

2402

" down\n");

2403

}

2404

}

2405

2406

lower_privileges_permanently();

3048

2407

}

3049

2408

3050

2409

free(interfaces_to_take_down);

3051

2410

free(interfaces_hooks);

3052

2411

3053

void clean_dir_at(int base, const char * const dirname,

3054

uintmax_t level){

2412

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

2413

if(tempdir_created){

3055

2414

struct dirent **direntries = NULL;

3056

int dret;

3057

int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,

3058

O_RDONLY

3059

| O_NOFOLLOW

3060

| O_DIRECTORY

3061

| O_PATH));

3062

if(dir_fd == -1){

3063

perror_plus("open");

3064

}

3065

int numentries = scandirat(dir_fd, ".", &direntries,

3066

notdotentries, alphasort);

3067

if(numentries >= 0){

2415

struct dirent *direntry = NULL;

2416

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

2417

alphasort);

2418

if (numentries > 0){

3068

2419

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

3069

if(debug){

3070

fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",

3071

dirname, direntries[i]->d_name);

3072

}

3073

dret = unlinkat(dir_fd, direntries[i]->d_name, 0);

3074

if(dret == -1){

3075

if(errno == EISDIR){

3076

dret = unlinkat(dir_fd, direntries[i]->d_name,

3077

AT_REMOVEDIR);

3078

}

3079

if((dret == -1) and (errno == ENOTEMPTY)

3080

and (strcmp(direntries[i]->d_name, "private-keys-v1.d")

3081

== 0) and (level == 0)){

3082

/* Recurse only in this special case */

3083

clean_dir_at(dir_fd, direntries[i]->d_name, level+1);

3084

dret = 0;

3085

}

3086

if(dret == -1){

3087

fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,

3088

direntries[i]->d_name, strerror(errno));

3089

}

3090

}

3091

free(direntries[i]);

3092

}

3093

3094

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

3095

free(direntries);

3096

if(numentries == -1){

3097

perror_plus("scandirat");

3098

}

3099

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3100

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

3101

perror_plus("rmdir");

3102

}

3103

} else {

3104

perror_plus("scandirat");

3105

}

3106

close(dir_fd);

3107

}

3108

3109

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

3110

if(tempdir != NULL){

3111

clean_dir_at(-1, tempdir, 0);

2420

direntry = direntries[i];

2421

char *fullname = NULL;

2422

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

2423

direntry->d_name);

2424

if(ret < 0){

2425

perror_plus("asprintf");

2426

continue;

2427

}

2428

ret = remove(fullname);

2429

if(ret == -1){

2430

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

2431

strerror(errno));

2432

}

2433

free(fullname);

2434

}

2435

}

2436

2437

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

2438

free(direntries);

2439

if (numentries == -1){

2440

perror_plus("scandir");

2441

}

2442

ret = rmdir(tempdir);

2443

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

2444

perror_plus("rmdir");

2445

}

3112

2446

}

3113

2447

3114

2448

if(quit_now){