/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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#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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#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,

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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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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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*/

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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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#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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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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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;

151

int hookdir_fd = -1;

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142

uid_t uid = 65534;

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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;

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150

int af;

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struct timespec last_seen;

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155

166

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

167

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typedef struct {

158

AvahiSimplePoll *simple_poll;

168

159

AvahiServer *server;

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160

gnutls_certificate_credentials_t cred;

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161

unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

174

165

server *current_server;

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char *interfaces;

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size_t interfaces_size;

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166

} mandos_context;

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167

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/* global so signal handler can reach it*/

180

AvahiSimplePoll *simple_poll;

168

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

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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;

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int signal_received = 0;

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perror(print_text);

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}

193

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

186

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

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187

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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190

199

191

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

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204

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/*

206

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

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* "buffer_length" is how much is already used.

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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;

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207

}

221

*buffer = new_buf;

222

208

buffer_capacity += BUFFER_SIZE;

223

209

}

224

210

return buffer_capacity;

225

211

}

226

212

227

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/* 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

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

360

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));

361

335

return false;

362

336

}

363

337

372

346

* Decrypt OpenPGP data.

373

347

* Returns -1 on error

374

348

*/

375

__attribute__((nonnull, warn_unused_result))

376

349

static ssize_t pgp_packet_decrypt(const char *cryptotext,

377

350

size_t crypto_size,

378

char **plaintext,

379

mandos_context *mc){

351

char **plaintext){

380

352

gpgme_data_t dh_crypto, dh_plain;

381

353

gpgme_error_t rc;

382

354

ssize_t ret;

399

371

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

400

372

rc = gpgme_data_new(&dh_plain);

401

373

if(rc != GPG_ERR_NO_ERROR){

402

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

374

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

375

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

403

376

gpgme_strsource(rc), gpgme_strerror(rc));

404

377

gpgme_data_release(dh_crypto);

405

378

return -1;

407

380

408

381

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

409

382

data buffer */

410

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

383

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

411

384

if(rc != GPG_ERR_NO_ERROR){

412

385

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

413

386

gpgme_strsource(rc), gpgme_strerror(rc));

414

387

plaintext_length = -1;

415

388

if(debug){

416

389

gpgme_decrypt_result_t result;

417

result = gpgme_op_decrypt_result(mc->ctx);

390

result = gpgme_op_decrypt_result(mc.ctx);

418

391

if(result == NULL){

419

392

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

420

393

} else {

421

if(result->unsupported_algorithm != NULL) {

422

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

423

result->unsupported_algorithm);

424

}

425

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

426

result->wrong_key_usage ? "Yes" : "No");

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);

427

398

if(result->file_name != NULL){

428

399

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

429

400

}

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

ret = close(dhpfile);

617

if(ret == -1){

618

perror_plus("close");

619

}

620

if(params.data == NULL){

621

dhparamsfilename = NULL;

622

}

623

if(dhparamsfilename == NULL){

624

break;

625

}

626

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

627

GNUTLS_X509_FMT_PEM);

628

if(ret != GNUTLS_E_SUCCESS){

629

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

630

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

631

safer_gnutls_strerror(ret));

632

dhparamsfilename = NULL;

633

}

634

free(params.data);

635

} while(false);

636

}

637

if(dhparamsfilename == NULL){

638

if(mc->dh_bits == 0){

639

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

640

/* Try to read the private key file */

641

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

642

do {

643

int secfile = open(seckeyfilename, O_RDONLY);

644

if(secfile == -1){

645

perror_plus("open");

646

break;

647

}

648

size_t buffer_capacity = 0;

649

while(true){

650

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

651

(size_t)buffer.size,

652

(size_t)buffer_capacity);

653

if(buffer_capacity == 0){

654

perror_plus("incbuffer");

655

free(buffer.data);

656

buffer.data = NULL;

657

break;

658

}

659

ssize_t bytes_read = read(secfile,

660

buffer.data + buffer.size,

661

BUFFER_SIZE);

662

/* EOF */

663

if(bytes_read == 0){

664

break;

665

}

666

/* check bytes_read for failure */

667

if(bytes_read < 0){

668

perror_plus("read");

669

free(buffer.data);

670

buffer.data = NULL;

671

break;

672

}

673

buffer.size += (unsigned int)bytes_read;

674

}

675

close(secfile);

676

} while(false);

677

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

678

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

679

if(buffer.data != NULL){

680

{

681

gnutls_openpgp_privkey_t privkey = NULL;

682

ret = gnutls_openpgp_privkey_init(&privkey);

683

if(ret != GNUTLS_E_SUCCESS){

684

fprintf_plus(stderr, "Error initializing OpenPGP key"

685

" structure: %s",

686

safer_gnutls_strerror(ret));

687

free(buffer.data);

688

buffer.data = NULL;

689

} else {

690

ret = gnutls_openpgp_privkey_import

691

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

692

if(ret != GNUTLS_E_SUCCESS){

693

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

694

safer_gnutls_strerror(ret));

695

privkey = NULL;

696

}

697

free(buffer.data);

698

buffer.data = NULL;

699

if(privkey != NULL){

700

/* Use private key to suggest an appropriate

701

sec_param */

702

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

703

gnutls_openpgp_privkey_deinit(privkey);

704

if(debug){

705

fprintf_plus(stderr, "This OpenPGP key implies using"

706

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

707

safe_string(gnutls_sec_param_get_name

708

(sec_param)));

709

}

710

}

711

}

712

}

713

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

714

/* Err on the side of caution */

715

sec_param = GNUTLS_SEC_PARAM_ULTRA;

716

if(debug){

717

fprintf_plus(stderr, "Falling back to security parameter"

718

" \"%s\"\n",

719

safe_string(gnutls_sec_param_get_name

720

(sec_param)));

721

}

722

}

723

}

724

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

725

if(uret != 0){

726

mc->dh_bits = uret;

727

if(debug){

728

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

729

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

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

mc->dh_bits);

733

}

734

} else {

735

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

736

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

737

safe_string(gnutls_sec_param_get_name

738

(sec_param)),

739

safer_gnutls_strerror(ret));

740

goto globalfail;

741

}

742

} else if(debug){

743

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

744

mc->dh_bits);

745

}

746

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

747

if(ret != GNUTLS_E_SUCCESS){

748

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

749

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

750

safer_gnutls_strerror(ret));

751

goto globalfail;

752

}

753

}

754

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);

755

554

756

555

return 0;

757

556

758

557

globalfail:

759

558

760

gnutls_certificate_free_credentials(mc->cred);

761

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);

762

562

return -1;

763

563

}

764

564

765

__attribute__((nonnull, warn_unused_result))

766

static int init_gnutls_session(gnutls_session_t *session,

767

mandos_context *mc){

565

static int init_gnutls_session(gnutls_session_t *session){

768

566

int ret;

769

567

/* GnuTLS session creation */

770

568

do {

782

580

{

783

581

const char *err;

784

582

do {

785

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

583

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

786

584

if(quit_now){

787

585

gnutls_deinit(*session);

788

586

return -1;

799

597

800

598

do {

801

599

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

802

mc->cred);

600

mc.cred);

803

601

if(quit_now){

804

602

gnutls_deinit(*session);

805

603

return -1;

815

613

/* ignore client certificate if any. */

816

614

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

817

615

616

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

617

818

618

return 0;

819

619

}

820

620

822

622

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

823

623

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

824

624

825

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

826

__attribute__((warn_unused_result))

827

int raise_privileges(void){

828

int old_errno = errno;

829

int ret = 0;

830

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

831

ret = errno;

832

}

833

errno = old_errno;

834

return ret;

835

}

836

837

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

838

__attribute__((warn_unused_result))

839

int raise_privileges_permanently(void){

840

int old_errno = errno;

841

int ret = raise_privileges();

842

if(ret != 0){

843

errno = old_errno;

844

return ret;

845

}

846

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

847

ret = errno;

848

}

849

errno = old_errno;

850

return ret;

851

}

852

853

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

854

__attribute__((warn_unused_result))

855

int lower_privileges(void){

856

int old_errno = errno;

857

int ret = 0;

858

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

859

ret = errno;

860

}

861

errno = old_errno;

862

return ret;

863

}

864

865

/* Lower privileges permanently */

866

__attribute__((warn_unused_result))

867

int lower_privileges_permanently(void){

868

int old_errno = errno;

869

int ret = 0;

870

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

871

ret = errno;

872

}

873

errno = old_errno;

874

return ret;

875

}

876

877

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

878

__attribute__((nonnull, warn_unused_result))

879

static bool add_delete_local_route(const bool add,

880

const char *address,

881

AvahiIfIndex if_index){

882

int ret;

883

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

884

char add_arg[] = "add";

885

char delete_arg[] = "delete";

886

char debug_flag[] = "--debug";

887

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

888

if(pluginhelperdir == NULL){

889

if(debug){

890

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

891

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

892

}

893

return false;

894

}

895

896

char interface[IF_NAMESIZE];

897

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

898

perror_plus("if_indextoname");

899

return false;

900

}

901

902

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

903

if(devnull == -1){

904

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

905

return false;

906

}

907

pid_t pid = fork();

908

if(pid == 0){

909

/* Child */

910

/* Raise privileges */

911

errno = raise_privileges_permanently();

912

if(errno != 0){

913

perror_plus("Failed to raise privileges");

914

/* _exit(EX_NOPERM); */

915

} else {

916

/* Set group */

917

errno = 0;

918

ret = setgid(0);

919

if(ret == -1){

920

perror_plus("setgid");

921

_exit(EX_NOPERM);

922

}

923

/* Reset supplementary groups */

924

errno = 0;

925

ret = setgroups(0, NULL);

926

if(ret == -1){

927

perror_plus("setgroups");

928

_exit(EX_NOPERM);

929

}

930

}

931

ret = dup2(devnull, STDIN_FILENO);

932

if(ret == -1){

933

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

934

_exit(EX_OSERR);

935

}

936

ret = close(devnull);

937

if(ret == -1){

938

perror_plus("close");

939

_exit(EX_OSERR);

940

}

941

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

942

if(ret == -1){

943

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

944

_exit(EX_OSERR);

945

}

946

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

947

O_RDONLY

948

| O_DIRECTORY

949

| O_PATH

950

| O_CLOEXEC));

951

if(helperdir_fd == -1){

952

perror_plus("open");

953

_exit(EX_UNAVAILABLE);

954

}

955

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

956

helper, O_RDONLY));

957

if(helper_fd == -1){

958

perror_plus("openat");

959

close(helperdir_fd);

960

_exit(EX_UNAVAILABLE);

961

}

962

close(helperdir_fd);

963

#ifdef __GNUC__

964

#pragma GCC diagnostic push

965

#pragma GCC diagnostic ignored "-Wcast-qual"

966

#endif

967

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

968

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

969

interface, debug ? debug_flag : NULL, NULL },

970

environ) == -1){

971

#ifdef __GNUC__

972

#pragma GCC diagnostic pop

973

#endif

974

perror_plus("fexecve");

975

_exit(EXIT_FAILURE);

976

}

977

}

978

if(pid == -1){

979

perror_plus("fork");

980

return false;

981

}

982

int status;

983

pid_t pret = -1;

984

errno = 0;

985

do {

986

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

987

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

988

int errno_raising = 0;

989

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

990

errno_raising = errno;

991

perror_plus("Failed to raise privileges in order to"

992

" kill helper program");

993

}

994

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

995

perror_plus("kill");

996

}

997

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

998

perror_plus("Failed to lower privileges after killing"

999

" helper program");

1000

}

1001

return false;

1002

}

1003

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

1004

if(pret == -1){

1005

perror_plus("waitpid");

1006

return false;

1007

}

1008

if(WIFEXITED(status)){

1009

if(WEXITSTATUS(status) != 0){

1010

fprintf_plus(stderr, "Error: iprouteadddel exited"

1011

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

1012

return false;

1013

}

1014

return true;

1015

}

1016

if(WIFSIGNALED(status)){

1017

fprintf_plus(stderr, "Error: iprouteadddel died by"

1018

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

1019

return false;

1020

}

1021

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

1022

return false;

1023

}

1024

1025

__attribute__((nonnull, warn_unused_result))

1026

static bool add_local_route(const char *address,

1027

AvahiIfIndex if_index){

1028

if(debug){

1029

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

1030

}

1031

return add_delete_local_route(true, address, if_index);

1032

}

1033

1034

__attribute__((nonnull, warn_unused_result))

1035

static bool delete_local_route(const char *address,

1036

AvahiIfIndex if_index){

1037

if(debug){

1038

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

1039

}

1040

return add_delete_local_route(false, address, if_index);

1041

}

1042

1043

625

/* Called when a Mandos server is found */

1044

__attribute__((nonnull, warn_unused_result))

1045

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

626

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

1046

627

AvahiIfIndex if_index,

1047

int af, mandos_context *mc){

628

int af){

1048

629

int ret, tcp_sd = -1;

1049

630

ssize_t sret;

1050

struct sockaddr_storage to;

631

union {

632

struct sockaddr_in in;

633

struct sockaddr_in6 in6;

634

} to;

1051

635

char *buffer = NULL;

1052

636

char *decrypted_buffer = NULL;

1053

637

size_t buffer_length = 0;

1056

640

int retval = -1;

1057

641

gnutls_session_t session;

1058

642

int pf; /* Protocol family */

1059

bool route_added = false;

1060

643

1061

644

errno = 0;

1062

645

1078

661

return -1;

1079

662

}

1080

663

1081

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

1082

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

1083

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

1084

bool match = false;

1085

{

1086

char *interface = NULL;

1087

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

1088

mc->interfaces_size,

1089

interface))){

1090

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

1091

match = true;

1092

break;

1093

}

1094

}

1095

}

1096

if(not match){

1097

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

1098

connect to the server */

1099

if(debug){

1100

char interface[IF_NAMESIZE];

1101

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

1102

perror_plus("if_indextoname");

1103

} else {

1104

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

1105

" \"%s\"\n",

1106

if_indextoname((unsigned int)if_index,

1107

interface));

1108

}

1109

}

1110

return -1;

1111

}

1112

}

1113

1114

ret = init_gnutls_session(&session, mc);

664

ret = init_gnutls_session(&session);

1115

665

if(ret != 0){

1116

666

return -1;

1117

667

}

1118

668

1119

669

if(debug){

1120

670

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

1121

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

671

PRIu16 "\n", ip, port);

1122

672

}

1123

673

1124

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

674

tcp_sd = socket(pf, SOCK_STREAM, 0);

1125

675

if(tcp_sd < 0){

1126

676

int e = errno;

1127

677

perror_plus("socket");

1134

684

goto mandos_end;

1135

685

}

1136

686

687

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

1137

688

if(af == AF_INET6){

1138

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

1139

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

1140

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);

1141

691

} else { /* IPv4 */

1142

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

1143

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

1144

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);

1145

694

}

1146

695

if(ret < 0 ){

1147

696

int e = errno;

1156

705

goto mandos_end;

1157

706

}

1158

707

if(af == AF_INET6){

1159

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

1160

if(IN6_IS_ADDR_LINKLOCAL

1161

(&((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*/

1162

715

if(if_index == AVAHI_IF_UNSPEC){

1163

716

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

1164

717

" incomplete without a network interface\n");

1166

719

goto mandos_end;

1167

720

}

1168

721

/* Set the network interface number as scope */

1169

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

722

to.in6.sin6_scope_id = (uint32_t)if_index;

1170

723

}

1171

724

} else {

1172

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

725

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

726

-Wconversion and

727

-Wunreachable-code */

1173

728

}

1174

729

1175

730

if(quit_now){

1183

738

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

1184

739

perror_plus("if_indextoname");

1185

740

} else {

1186

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

1187

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

741

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

742

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

1188

743

}

1189

744

} else {

1190

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

1191

ip, (uintmax_t)port);

745

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

746

ip, port);

1192

747

}

1193

748

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1194

749

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1195

if(af == AF_INET6){

1196

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

1197

sizeof(struct sockaddr_in6),

1198

addrstr, sizeof(addrstr), NULL, 0,

1199

NI_NUMERICHOST);

1200

} else {

1201

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

1202

sizeof(struct sockaddr_in),

1203

addrstr, sizeof(addrstr), NULL, 0,

1204

NI_NUMERICHOST);

1205

}

1206

if(ret == EAI_SYSTEM){

1207

perror_plus("getnameinfo");

1208

} else if(ret != 0) {

1209

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

1210

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

1211

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

1212

}

1213

}

1214

1215

if(quit_now){

1216

errno = EINTR;

1217

goto mandos_end;

1218

}

1219

1220

while(true){

1221

if(af == AF_INET6){

1222

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

1223

sizeof(struct sockaddr_in6));

1224

} else {

1225

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

1226

sizeof(struct sockaddr_in));

1227

}

1228

if(ret < 0){

1229

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

1230

and if_index != AVAHI_IF_UNSPEC

1231

and connect_to == NULL

1232

and not route_added and

1233

((af == AF_INET6 and not

1234

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1235

&to)->sin6_addr)))

1236

or (af == AF_INET and

1237

/* Not a a IPv4LL address */

1238

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

1239

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

1240

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

1241

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

1242

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

1243

connect to a Mandos server announced by Avahi on a server

1244

host with a global address. Work around this by retrying

1245

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

1246

1247

Avahi bug reference:

1248

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

1249

https://bugs.debian.org/587961

1250

*/

1251

if(debug){

1252

fprintf_plus(stderr, "Mandos server unreachable, trying"

1253

" direct route\n");

1254

}

1255

int e = errno;

1256

route_added = add_local_route(ip, if_index);

1257

if(route_added){

1258

continue;

1259

}

1260

errno = e;

1261

}

1262

if(errno != ECONNREFUSED or debug){

1263

int e = errno;

1264

perror_plus("connect");

1265

errno = e;

1266

}

1267

goto mandos_end;

1268

}

1269

1270

if(quit_now){

1271

errno = EINTR;

1272

goto mandos_end;

1273

}

1274

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;

1275

789

}

1276

790

1277

791

const char *out = mandos_protocol_version;

1428

942

if(buffer_length > 0){

1429

943

ssize_t decrypted_buffer_size;

1430

944

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1431

&decrypted_buffer, mc);

945

&decrypted_buffer);

1432

946

if(decrypted_buffer_size >= 0){

1433

947

1434

clearerr(stdout);

1435

948

written = 0;

1436

949

while(written < (size_t) decrypted_buffer_size){

1437

950

if(quit_now){

1453

966

}

1454

967

written += (size_t)ret;

1455

968

}

1456

ret = fflush(stdout);

1457

if(ret != 0){

1458

int e = errno;

1459

if(debug){

1460

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

1461

strerror(errno));

1462

}

1463

errno = e;

1464

goto mandos_end;

1465

}

1466

969

retval = 0;

1467

970

}

1468

971

}

1471

974

1472

975

mandos_end:

1473

976

{

1474

if(route_added){

1475

if(not delete_local_route(ip, if_index)){

1476

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

1477

" interface %d", ip, if_index);

1478

}

1479

}

1480

977

int e = errno;

1481

978

free(decrypted_buffer);

1482

979

free(buffer);

1483

980

if(tcp_sd >= 0){

1484

ret = close(tcp_sd);

981

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

1485

982

}

1486

983

if(ret == -1){

1487

984

if(e == 0){

1512

1009

AVAHI_GCC_UNUSED AvahiStringList *txt,

1513

1010

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1514

1011

flags,

1515

void *mc){

1516

if(r == NULL){

1517

return;

1518

}

1012

AVAHI_GCC_UNUSED void* userdata){

1013

assert(r);

1519

1014

1520

1015

/* Called whenever a service has been resolved successfully or

1521

1016

timed out */

1522

1017

1523

1018

if(quit_now){

1524

avahi_s_service_resolver_free(r);

1525

1019

return;

1526

1020

}

1527

1021

1531

1025

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

1532

1026

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

1533

1027

domain,

1534

avahi_strerror(avahi_server_errno

1535

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

1028

avahi_strerror(avahi_server_errno(mc.server)));

1536

1029

break;

1537

1030

1538

1031

case AVAHI_RESOLVER_FOUND:

1544

1037

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

1545

1038

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

1546

1039

}

1547

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

1548

interface,

1549

avahi_proto_to_af(proto),

1550

mc);

1040

int ret = start_mandos_communication(ip, port, interface,

1041

avahi_proto_to_af(proto));

1551

1042

if(ret == 0){

1552

avahi_simple_poll_quit(simple_poll);

1043

avahi_simple_poll_quit(mc.simple_poll);

1553

1044

} else {

1554

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

1555

avahi_proto_to_af(proto),

1556

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

1045

if(not add_server(ip, port, interface,

1046

avahi_proto_to_af(proto))){

1557

1047

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

1558

1048

" list\n", name);

1559

1049

}

1572

1062

const char *domain,

1573

1063

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1574

1064

flags,

1575

void *mc){

1576

if(b == NULL){

1577

return;

1578

}

1065

AVAHI_GCC_UNUSED void* userdata){

1066

assert(b);

1579

1067

1580

1068

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

1581

1069

is removed from the LAN */

1589

1077

case AVAHI_BROWSER_FAILURE:

1590

1078

1591

1079

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

1592

avahi_strerror(avahi_server_errno

1593

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

1594

avahi_simple_poll_quit(simple_poll);

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1595

1082

return;

1596

1083

1597

1084

case AVAHI_BROWSER_NEW:

1600

1087

the callback function is called the Avahi server will free the

1601

1088

resolver for us. */

1602

1089

1603

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

1604

interface, protocol, name, type,

1605

domain, protocol, 0,

1606

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)

1607

1093

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

1608

1094

" %s\n", name,

1609

avahi_strerror(avahi_server_errno

1610

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

1095

avahi_strerror(avahi_server_errno(mc.server)));

1611

1096

break;

1612

1097

1613

1098

case AVAHI_BROWSER_REMOVE:

1632

1117

signal_received = sig;

1633

1118

int old_errno = errno;

1634

1119

/* set main loop to exit */

1635

if(simple_poll != NULL){

1636

avahi_simple_poll_quit(simple_poll);

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1637

1122

}

1638

1123

errno = old_errno;

1639

1124

}

1640

1125

1641

__attribute__((nonnull, warn_unused_result))

1642

1126

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

1643

1127

int ret;

1644

int old_errno;

1128

error_t ret_errno;

1645

1129

1646

1130

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

1647

1131

if(s < 0){

1648

old_errno = errno;

1132

ret_errno = errno;

1649

1133

perror_plus("socket");

1650

errno = old_errno;

1134

errno = ret_errno;

1651

1135

return false;

1652

1136

}

1653

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

1654

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

1137

strcpy(ifr->ifr_name, ifname);

1655

1138

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1656

1139

if(ret == -1){

1657

1140

if(debug){

1658

old_errno = errno;

1141

ret_errno = errno;

1659

1142

perror_plus("ioctl SIOCGIFFLAGS");

1660

errno = old_errno;

1661

}

1662

if((close(s) == -1) and debug){

1663

old_errno = errno;

1664

perror_plus("close");

1665

errno = old_errno;

1143

errno = ret_errno;

1666

1144

}

1667

1145

return false;

1668

1146

}

1669

if((close(s) == -1) and debug){

1670

old_errno = errno;

1671

perror_plus("close");

1672

errno = old_errno;

1673

}

1674

1147

return true;

1675

1148

}

1676

1149

1677

__attribute__((nonnull, warn_unused_result))

1678

1150

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

1679

1151

1680

1152

/* Reject the loopback device */

1722

1194

* corresponds to an acceptable network device.

1723

1195

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

1724

1196

*/

1725

__attribute__((nonnull, warn_unused_result))

1726

1197

int good_interface(const struct dirent *if_entry){

1727

1198

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

1728

1199

return 0;

1746

1217

/*

1747

1218

* This function determines if a network interface is up.

1748

1219

*/

1749

__attribute__((nonnull, warn_unused_result))

1750

1220

bool interface_is_up(const char *interface){

1751

1221

struct ifreq ifr;

1752

1222

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

1763

1233

/*

1764

1234

* This function determines if a network interface is running

1765

1235

*/

1766

__attribute__((nonnull, warn_unused_result))

1767

1236

bool interface_is_running(const char *interface){

1768

1237

struct ifreq ifr;

1769

1238

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

1777

1246

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

1778

1247

}

1779

1248

1780

__attribute__((nonnull, pure, warn_unused_result))

1781

1249

int notdotentries(const struct dirent *direntry){

1782

1250

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

1783

1251

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

1790

1258

}

1791

1259

1792

1260

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

1793

__attribute__((nonnull, warn_unused_result))

1794

1261

int runnable_hook(const struct dirent *direntry){

1795

1262

int ret;

1796

1263

size_t sret;

1804

1271

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

1805

1272

"abcdefghijklmnopqrstuvwxyz"

1806

1273

"0123456789"

1807

"_.-");

1274

"_-");

1808

1275

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

1809

1276

/* Contains non-allowed characters */

1810

1277

if(debug){

1814

1281

return 0;

1815

1282

}

1816

1283

1817

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);

1818

1292

if(ret == -1){

1819

1293

if(debug){

1820

1294

perror_plus("Could not stat hook");

1844

1318

return 1;

1845

1319

}

1846

1320

1847

__attribute__((nonnull, warn_unused_result))

1848

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1849

mandos_context *mc){

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1850

1322

int ret;

1851

1323

struct timespec now;

1852

1324

struct timespec waited_time;

1853

1325

intmax_t block_time;

1854

1326

1855

1327

while(true){

1856

if(mc->current_server == NULL){

1857

if(debug){

1328

if(mc.current_server == NULL){

1329

if (debug){

1858

1330

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

1859

1331

" No timeout!\n");

1860

1332

}

1861

1333

ret = avahi_simple_poll_iterate(s, -1);

1862

1334

} else {

1863

if(debug){

1335

if (debug){

1864

1336

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

1865

1337

" it, or wait\n");

1866

1338

}

1873

1345

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

1874

1346

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

1875

1347

waited_time.tv_sec = (now.tv_sec

1876

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

1348

- mc.current_server->last_seen.tv_sec);

1877

1349

waited_time.tv_nsec = (now.tv_nsec

1878

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

1350

- mc.current_server->last_seen.tv_nsec);

1879

1351

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

1880

1352

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

1881

1353

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

1883

1355

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

1884

1356

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

1885

1357

1886

if(debug){

1358

if (debug){

1887

1359

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

1888

1360

block_time);

1889

1361

}

1890

1362

1891

1363

if(block_time <= 0){

1892

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

1893

mc->current_server->port,

1894

mc->current_server->if_index,

1895

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);

1896

1368

if(ret == 0){

1897

avahi_simple_poll_quit(s);

1369

avahi_simple_poll_quit(mc.simple_poll);

1898

1370

return 0;

1899

1371

}

1900

1372

ret = clock_gettime(CLOCK_MONOTONIC,

1901

&mc->current_server->last_seen);

1373

&mc.current_server->last_seen);

1902

1374

if(ret == -1){

1903

1375

perror_plus("clock_gettime");

1904

1376

return -1;

1905

1377

}

1906

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

1378

mc.current_server = mc.current_server->next;

1907

1379

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

1908

1380

servers, but don't block */

1909

1381

}

1911

1383

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

1912

1384

}

1913

1385

if(ret != 0){

1914

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

1386

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

1915

1387

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

1916

1388

}

1917

1389

}

1918

1390

}

1919

1391

}

1920

1392

1921

__attribute__((nonnull))

1922

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,

1923

1446

const float delay){

1924

struct dirent **direntries = NULL;

1925

if(hookdir_fd == -1){

1926

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1927

| O_CLOEXEC);

1928

if(hookdir_fd == -1){

1929

if(errno == ENOENT){

1930

if(debug){

1931

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

1932

" found\n", hookdir);

1933

}

1934

} else {

1935

perror_plus("open");

1936

}

1937

return;

1938

}

1939

}

1940

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

1941

if(devnull == -1){

1942

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

1943

return;

1944

}

1945

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

1946

runnable_hook, alphasort);

1447

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

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

1451

alphasort);

1947

1452

if(numhooks == -1){

1948

1453

perror_plus("scandir");

1949

close(devnull);

1950

return;

1951

}

1952

struct dirent *direntry;

1953

int ret;

1954

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

1955

direntry = direntries[i];

1956

if(debug){

1957

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

1958

direntry->d_name);

1959

}

1960

pid_t hook_pid = fork();

1961

if(hook_pid == 0){

1962

/* Child */

1963

/* Raise privileges */

1964

errno = raise_privileges_permanently();

1965

if(errno != 0){

1966

perror_plus("Failed to raise privileges");

1967

_exit(EX_NOPERM);

1968

}

1969

/* Set group */

1970

errno = 0;

1971

ret = setgid(0);

1972

if(ret == -1){

1973

perror_plus("setgid");

1974

_exit(EX_NOPERM);

1975

}

1976

/* Reset supplementary groups */

1977

errno = 0;

1978

ret = setgroups(0, NULL);

1979

if(ret == -1){

1980

perror_plus("setgroups");

1981

_exit(EX_NOPERM);

1982

}

1983

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

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

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

1989

if(ret == -1){

1990

perror_plus("setenv");

1991

_exit(EX_OSERR);

1992

}

1993

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

1994

if(ret == -1){

1995

perror_plus("setenv");

1996

_exit(EX_OSERR);

1997

}

1998

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

1999

if(ret == -1){

2000

perror_plus("setenv");

2001

_exit(EX_OSERR);

2002

}

2003

char *delaystring;

2004

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

2005

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){

2006

1461

perror_plus("asprintf");

2007

_exit(EX_OSERR);

2008

}

2009

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

2010

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

}

2011

1520

free(delaystring);

2012

perror_plus("setenv");

2013

_exit(EX_OSERR);

2014

}

2015

free(delaystring);

2016

if(connect_to != NULL){

2017

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

2018

if(ret == -1){

2019

perror_plus("setenv");

2020

_exit(EX_OSERR);

2021

}

2022

}

2023

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

2024

direntry->d_name,

2025

O_RDONLY));

2026

if(hook_fd == -1){

2027

perror_plus("openat");

2028

_exit(EXIT_FAILURE);

2029

}

2030

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

2031

perror_plus("close");

2032

_exit(EXIT_FAILURE);

2033

}

2034

ret = dup2(devnull, STDIN_FILENO);

2035

if(ret == -1){

2036

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

2037

_exit(EX_OSERR);

2038

}

2039

ret = close(devnull);

2040

if(ret == -1){

2041

perror_plus("close");

2042

_exit(EX_OSERR);

2043

}

2044

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2045

if(ret == -1){

2046

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

2047

_exit(EX_OSERR);

2048

}

2049

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

2050

environ) == -1){

2051

perror_plus("fexecve");

2052

_exit(EXIT_FAILURE);

2053

}

2054

} else {

2055

if(hook_pid == -1){

2056

perror_plus("fork");

2057

free(direntry);

2058

continue;

2059

}

2060

int status;

2061

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

2062

perror_plus("waitpid");

2063

free(direntry);

2064

continue;

2065

}

2066

if(WIFEXITED(status)){

2067

if(WEXITSTATUS(status) != 0){

2068

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

2069

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

2070

WEXITSTATUS(status));

2071

free(direntry);

2072

continue;

2073

}

2074

} else if(WIFSIGNALED(status)){

2075

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

2076

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

2077

WTERMSIG(status));

2078

free(direntry);

2079

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

}

2080

1532

} else {

2081

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

2082

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

2083

free(direntry);

2084

continue;

2085

}

2086

}

2087

if(debug){

2088

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

2089

direntry->d_name);

2090

}

2091

free(direntry);

2092

}

2093

free(direntries);

2094

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

2095

perror_plus("close");

2096

} else {

2097

hookdir_fd = -1;

2098

}

2099

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;

2100

1569

}

2101

1570

2102

__attribute__((nonnull, warn_unused_result))

2103

int bring_up_interface(const char *const interface,

2104

const float delay){

2105

int old_errno = errno;

2106

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;

2107

1577

struct ifreq network;

2108

1578

unsigned int if_index = if_nametoindex(interface);

2109

1579

if(if_index == 0){

2118

1588

}

2119

1589

2120

1590

if(not interface_is_up(interface)){

2121

int ret_errno = 0;

2122

int ioctl_errno = 0;

2123

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

1591

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

2124

1592

ret_errno = errno;

2125

1593

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

2126

1594

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

2127

errno = old_errno;

2128

1595

return ret_errno;

2129

1596

}

2130

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

1597

network.ifr_flags |= IFF_UP;

2131

1598

2132

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

2133

if(sd == -1){

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

2134

1601

ret_errno = errno;

2135

1602

perror_plus("socket");

2136

1603

errno = old_errno;

2137

1604

return ret_errno;

2138

1605

}

2139

1606

2140

1607

if(quit_now){

2141

ret = close(sd);

2142

if(ret == -1){

2143

perror_plus("close");

2144

}

1608

close(sd);

2145

1609

errno = old_errno;

2146

1610

return EINTR;

2147

1611

}

2151

1615

interface);

2152

1616

}

2153

1617

2154

/* Raise privileges */

2155

ret_errno = raise_privileges();

2156

if(ret_errno != 0){

2157

errno = ret_errno;

2158

perror_plus("Failed to raise privileges");

2159

}

1618

/* Raise priviliges */

1619

raise_privileges();

2160

1620

2161

1621

#ifdef __linux__

2162

int ret_linux;

2163

bool restore_loglevel = false;

2164

if(ret_errno == 0){

2165

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2166

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

2167

ret_linux = klogctl(8, NULL, 5);

2168

if(ret_linux == -1){

2169

perror_plus("klogctl");

2170

} else {

2171

restore_loglevel = true;

2172

}

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");

2173

1629

}

2174

1630

#endif /* __linux__ */

2175

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

2176

ioctl_errno = errno;

1631

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

1632

ret_errno = errno;

2177

1633

#ifdef __linux__

2178

1634

if(restore_loglevel){

2179

1635

ret_linux = klogctl(7, NULL, 0);

2183

1639

}

2184

1640

#endif /* __linux__ */

2185

1641

2186

/* If raise_privileges() succeeded above */

2187

if(ret_errno == 0){

2188

/* Lower privileges */

2189

ret_errno = lower_privileges();

2190

if(ret_errno != 0){

2191

errno = ret_errno;

2192

perror_plus("Failed to lower privileges");

2193

}

2194

}

1642

/* Lower privileges */

1643

lower_privileges();

2195

1644

2196

1645

/* Close the socket */

2197

ret = close(sd);

1646

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

2198

1647

if(ret == -1){

2199

1648

perror_plus("close");

2200

1649

}

2201

1650

2202

1651

if(ret_setflags == -1){

2203

errno = ioctl_errno;

1652

errno = ret_errno;

2204

1653

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2205

1654

errno = old_errno;

2206

return ioctl_errno;

1655

return ret_errno;

2207

1656

}

2208

1657

} else if(debug){

2209

1658

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

2212

1661

2213

1662

/* Sleep checking until interface is running.

2214

1663

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

2215

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

1664

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

2216

1665

if(interface_is_running(interface)){

2217

1666

break;

2218

1667

}

2227

1676

return 0;

2228

1677

}

2229

1678

2230

__attribute__((nonnull, warn_unused_result))

2231

int take_down_interface(const char *const interface){

2232

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;

2233

1684

struct ifreq network;

2234

1685

unsigned int if_index = if_nametoindex(interface);

2235

1686

if(if_index == 0){

2238

1689

return ENXIO;

2239

1690

}

2240

1691

if(interface_is_up(interface)){

2241

int ret_errno = 0;

2242

int ioctl_errno = 0;

2243

1692

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

2244

1693

ret_errno = errno;

2245

1694

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

2246

1695

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

2247

errno = old_errno;

2248

1696

return ret_errno;

2249

1697

}

2250

1698

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

2251

1699

2252

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

2253

if(sd == -1){

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

2254

1702

ret_errno = errno;

2255

1703

perror_plus("socket");

2256

1704

errno = old_errno;

2262

1710

interface);

2263

1711

}

2264

1712

2265

/* Raise privileges */

2266

ret_errno = raise_privileges();

2267

if(ret_errno != 0){

2268

errno = ret_errno;

2269

perror_plus("Failed to raise privileges");

2270

}

2271

2272

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

2273

ioctl_errno = errno;

2274

2275

/* If raise_privileges() succeeded above */

2276

if(ret_errno == 0){

2277

/* Lower privileges */

2278

ret_errno = lower_privileges();

2279

if(ret_errno != 0){

2280

errno = ret_errno;

2281

perror_plus("Failed to lower privileges");

2282

}

2283

}

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();

2284

1721

2285

1722

/* Close the socket */

2286

int ret = close(sd);

1723

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

2287

1724

if(ret == -1){

2288

1725

perror_plus("close");

2289

1726

}

2290

1727

2291

1728

if(ret_setflags == -1){

2292

errno = ioctl_errno;

1729

errno = ret_errno;

2293

1730

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2294

1731

errno = old_errno;

2295

return ioctl_errno;

1732

return ret_errno;

2296

1733

}

2297

1734

} else if(debug){

2298

1735

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

2304

1741

}

2305

1742

2306

1743

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

2307

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

2308

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

2309

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

2310

.current_server = NULL, .interfaces = NULL,

2311

.interfaces_size = 0 };

2312

1744

AvahiSServiceBrowser *sb = NULL;

2313

1745

error_t ret_errno;

2314

1746

int ret;

2315

1747

intmax_t tmpmax;

2316

1748

char *tmp;

2317

1749

int exitcode = EXIT_SUCCESS;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

2318

1752

char *interfaces_to_take_down = NULL;

2319

1753

size_t interfaces_to_take_down_size = 0;

2320

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

2321

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

2322

char *tempdir = NULL;

1754

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

1755

bool tempdir_created = false;

2323

1756

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2324

1757

const char *seckey = PATHDIR "/" SECKEY;

2325

1758

const char *pubkey = PATHDIR "/" PUBKEY;

2326

const char *dh_params_file = NULL;

2327

1759

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

2328

1761

2329

1762

bool gnutls_initialized = false;

2330

1763

bool gpgme_initialized = false;

2382

1815

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

2383

1816

" Diffie-Hellman key exchange",

2384

1817

.group = 2 },

2385

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

2386

.arg = "FILE",

2387

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

2388

" for the Diffie-Hellman key exchange",

2389

.group = 2 },

2390

1818

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

2391

1819

.arg = "STRING",

2392

1820

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

2426

1854

connect_to = arg;

2427

1855

break;

2428

1856

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

2429

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

2430

arg, (int)',');

1857

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

1858

(int)',');

2431

1859

if(ret_errno != 0){

2432

1860

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

2433

1861

}

2447

1875

}

2448

1876

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

2449

1877

break;

2450

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

2451

dh_params_file = arg;

2452

break;

2453

1878

case 130: /* --priority */

2454

1879

mc.priority = arg;

2455

1880

break;

2495

1920

.args_doc = "",

2496

1921

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

2497

1922

" passwords from a Mandos server" };

2498

ret_errno = argp_parse(&argp, argc, argv,

2499

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2500

switch(ret_errno){

1923

ret = argp_parse(&argp, argc, argv,

1924

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1925

switch(ret){

2501

1926

case 0:

2502

1927

break;

2503

1928

case ENOMEM:

2504

1929

default:

2505

errno = ret_errno;

1930

errno = ret;

2506

1931

perror_plus("argp_parse");

2507

1932

exitcode = EX_OSERR;

2508

1933

goto end;

2511

1936

goto end;

2512

1937

}

2513

1938

}

2514

1939

2515

1940

{

2516

1941

/* Work around Debian bug #633582:

2517

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

1942

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

2518

1943

2519

/* Re-raise privileges */

2520

ret = raise_privileges();

2521

if(ret != 0){

2522

errno = ret;

2523

perror_plus("Failed to raise privileges");

2524

} else {

1944

/* Re-raise priviliges */

1945

if(raise_privileges() == 0){

2525

1946

struct stat st;

2526

1947

2527

1948

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

2541

1962

}

2542

1963

}

2543

1964

}

2544

close(seckey_fd);

1965

TEMP_FAILURE_RETRY(close(seckey_fd));

2545

1966

}

2546

1967

}

2547

1968

2548

1969

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

2549

1970

int pubkey_fd = open(pubkey, O_RDONLY);

2550

1971

if(pubkey_fd == -1){

2562

1983

}

2563

1984

}

2564

1985

}

2565

close(pubkey_fd);

2566

}

2567

}

2568

2569

if(dh_params_file != NULL

2570

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

2571

int dhparams_fd = open(dh_params_file, O_RDONLY);

2572

if(dhparams_fd == -1){

2573

perror_plus("open");

2574

} else {

2575

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

2576

if(ret == -1){

2577

perror_plus("fstat");

2578

} else {

2579

if(S_ISREG(st.st_mode)

2580

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

2581

ret = fchown(dhparams_fd, uid, gid);

2582

if(ret == -1){

2583

perror_plus("fchown");

2584

}

2585

}

2586

}

2587

close(dhparams_fd);

2588

}

2589

}

2590

1986

TEMP_FAILURE_RETRY(close(pubkey_fd));

1987

}

1988

}

1989

2591

1990

/* Lower privileges */

2592

ret = lower_privileges();

2593

if(ret != 0){

2594

errno = ret;

2595

perror_plus("Failed to lower privileges");

1991

errno = 0;

1992

ret = seteuid(uid);

1993

if(ret == -1){

1994

perror_plus("seteuid");

2596

1995

}

2597

1996

}

2598

1997

}

2599

1998

2600

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

1999

/* Remove empty interface names */

2601

2000

{

2602

2001

char *interface = NULL;

2603

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

2002

while((interface = argz_next(interfaces, interfaces_size,

2604

2003

interface))){

2605

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

2606

and if_nametoindex(interface) == 0){

2607

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

2004

if(if_nametoindex(interface) == 0){

2005

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

2608

2006

fprintf_plus(stderr, "Not using nonexisting interface"

2609

2007

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

2610

2008

}

2611

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

2009

argz_delete(&interfaces, &interfaces_size, interface);

2612

2010

interface = NULL;

2613

2011

}

2614

2012

}

2616

2014

2617

2015

/* Run network hooks */

2618

2016

{

2619

if(mc.interfaces != NULL){

2620

interfaces_hooks = malloc(mc.interfaces_size);

2621

if(interfaces_hooks == NULL){

2622

perror_plus("malloc");

2623

goto end;

2624

}

2625

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

2626

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

2627

}

2628

run_network_hooks("start", interfaces_hooks != NULL ?

2629

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

}

2630

2028

}

2631

2029

2632

2030

if(not debug){

2637

2035

from the signal handler */

2638

2036

/* Initialize the pseudo-RNG for Avahi */

2639

2037

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

2640

simple_poll = avahi_simple_poll_new();

2641

if(simple_poll == NULL){

2038

mc.simple_poll = avahi_simple_poll_new();

2039

if(mc.simple_poll == NULL){

2642

2040

fprintf_plus(stderr,

2643

2041

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

2644

2042

exitcode = EX_UNAVAILABLE;

2709

2107

}

2710

2108

2711

2109

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

2712

if(mc.interfaces == NULL){

2713

struct dirent **direntries = NULL;

2110

if(interfaces == NULL){

2111

struct dirent **direntries;

2714

2112

/* Look for any good interfaces */

2715

2113

ret = scandir(sys_class_net, &direntries, good_interface,

2716

2114

alphasort);

2717

2115

if(ret >= 1){

2718

2116

/* Add all found interfaces to interfaces list */

2719

2117

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

2720

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

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2721

2119

direntries[i]->d_name);

2722

2120

if(ret_errno != 0){

2723

errno = ret_errno;

2724

2121

perror_plus("argz_add");

2725

free(direntries[i]);

2726

2122

continue;

2727

2123

}

2728

2124

if(debug){

2729

2125

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

2730

2126

direntries[i]->d_name);

2731

2127

}

2732

free(direntries[i]);

2733

2128

}

2734

2129

free(direntries);

2735

2130

} else {

2736

if(ret == 0){

2737

free(direntries);

2738

}

2131

free(direntries);

2739

2132

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

2740

2133

exitcode = EXIT_FAILURE;

2741

2134

goto end;

2742

2135

}

2743

2136

}

2744

2137

2745

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

2746

{

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)){

2747

2150

char *interface = NULL;

2748

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

2151

while((interface = argz_next(interfaces, interfaces_size,

2749

2152

interface))){

2750

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

2751

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

2752

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

2753

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

2754

interface);

2755

interface = NULL;

2756

while((interface = argz_next(mc.interfaces,

2757

mc.interfaces_size, interface))){

2758

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

2759

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

2760

interface);

2761

interface = NULL;

2762

}

2763

}

2764

break;

2765

}

2766

2153

bool interface_was_up = interface_is_up(interface);

2767

errno = bring_up_interface(interface, delay);

2154

ret = bring_up_interface(interface, delay);

2768

2155

if(not interface_was_up){

2769

if(errno != 0){

2770

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

2771

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

2156

if(ret != 0){

2157

errno = ret;

2158

perror_plus("Failed to bring up interface");

2772

2159

} else {

2773

errno = argz_add(&interfaces_to_take_down,

2774

&interfaces_to_take_down_size,

2775

interface);

2776

if(errno != 0){

2777

perror_plus("argz_add");

2778

}

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2779

2163

}

2780

2164

}

2781

2165

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2782

2169

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

2783

2170

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

2784

2171

}

2785

2172

}

2786

2173

2787

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

2788

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

2789

if(debug){

2790

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

2791

mc.interfaces);

2792

}

2793

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

2794

}

2795

2796

2174

if(quit_now){

2797

2175

goto end;

2798

2176

}

2799

2177

2800

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

2178

ret = init_gnutls_global(pubkey, seckey);

2801

2179

if(ret == -1){

2802

2180

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

2803

2181

exitcode = EX_UNAVAILABLE;

2810

2188

goto end;

2811

2189

}

2812

2190

2813

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

2814

tempdir = mkdtemp(run_tempdir);

2815

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

2816

if(debug){

2817

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

2818

run_tempdir, old_tempdir);

2819

}

2820

tempdir = mkdtemp(old_tempdir);

2821

}

2822

if(tempdir == NULL){

2191

if(mkdtemp(tempdir) == NULL){

2823

2192

perror_plus("mkdtemp");

2824

2193

goto end;

2825

2194

}

2195

tempdir_created = true;

2826

2196

2827

2197

if(quit_now){

2828

2198

goto end;

2829

2199

}

2830

2200

2831

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

2201

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

2832

2202

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

2833

2203

exitcode = EX_UNAVAILABLE;

2834

2204

goto end;

2855

2225

goto end;

2856

2226

}

2857

2227

2858

in_port_t port;

2228

uint16_t port;

2859

2229

errno = 0;

2860

2230

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

2861

2231

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

2862

or tmpmax != (in_port_t)tmpmax){

2232

or tmpmax != (uint16_t)tmpmax){

2863

2233

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

2864

2234

exitcode = EX_USAGE;

2865

2235

goto end;

2866

2236

}

2867

2237

2868

2238

if(quit_now){

2869

2239

goto end;

2870

2240

}

2871

2241

2872

port = (in_port_t)tmpmax;

2242

port = (uint16_t)tmpmax;

2873

2243

*address = '\0';

2874

2244

/* Colon in address indicates IPv6 */

2875

2245

int af;

2891

2261

}

2892

2262

2893

2263

while(not quit_now){

2894

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

2895

&mc);

2264

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

2896

2265

if(quit_now or ret == 0){

2897

2266

break;

2898

2267

}

2900

2269

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

2901

2270

(int)retry_interval);

2902

2271

}

2903

sleep((unsigned int)retry_interval);

2272

sleep((int)retry_interval);

2904

2273

}

2905

2274

2906

if(not quit_now){

2275

if (not quit_now){

2907

2276

exitcode = EXIT_SUCCESS;

2908

2277

}

2909

2278

2924

2293

config.publish_domain = 0;

2925

2294

2926

2295

/* Allocate a new server */

2927

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2928

&config, NULL, NULL, &ret);

2296

mc.server = avahi_server_new(avahi_simple_poll_get

2297

(mc.simple_poll), &config, NULL,

2298

NULL, &ret_errno);

2929

2299

2930

2300

/* Free the Avahi configuration data */

2931

2301

avahi_server_config_free(&config);

2934

2304

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

2935

2305

if(mc.server == NULL){

2936

2306

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

2937

avahi_strerror(ret));

2307

avahi_strerror(ret_errno));

2938

2308

exitcode = EX_UNAVAILABLE;

2939

2309

goto end;

2940

2310

}

2946

2316

/* Create the Avahi service browser */

2947

2317

sb = avahi_s_service_browser_new(mc.server, if_index,

2948

2318

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2949

NULL, 0, browse_callback,

2950

(void *)&mc);

2319

NULL, 0, browse_callback, NULL);

2951

2320

if(sb == NULL){

2952

2321

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

2953

2322

avahi_strerror(avahi_server_errno(mc.server)));

2964

2333

if(debug){

2965

2334

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

2966

2335

}

2967

2968

ret = avahi_loop_with_timeout(simple_poll,

2969

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

2336

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

2338

(int)(retry_interval * 1000));

2970

2339

if(debug){

2971

2340

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

2972

2341

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

2975

2344

end:

2976

2345

2977

2346

if(debug){

2978

if(signal_received){

2979

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

2980

argv[0], signal_received,

2981

strsignal(signal_received));

2982

} else {

2983

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

2984

}

2347

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

2985

2348

}

2986

2349

2987

2350

/* Cleanup things */

2988

free(mc.interfaces);

2989

2990

2351

if(sb != NULL)

2991

2352

avahi_s_service_browser_free(sb);

2992

2353

2993

2354

if(mc.server != NULL)

2994

2355

avahi_server_free(mc.server);

2995

2356

2996

if(simple_poll != NULL)

2997

avahi_simple_poll_free(simple_poll);

2357

if(mc.simple_poll != NULL)

2358

avahi_simple_poll_free(mc.simple_poll);

2998

2359

2999

2360

if(gnutls_initialized){

3000

2361

gnutls_certificate_free_credentials(mc.cred);

2362

gnutls_global_deinit();

3001

2363

gnutls_dh_params_deinit(mc.dh_params);

3002

2364

}

3003

2365

3011

2373

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

3012

2374

while(mc.current_server != NULL){

3013

2375

server *next = mc.current_server->next;

3014

#ifdef __GNUC__

3015

#pragma GCC diagnostic push

3016

#pragma GCC diagnostic ignored "-Wcast-qual"

3017

#endif

3018

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

3019

#ifdef __GNUC__

3020

#pragma GCC diagnostic pop

3021

#endif

3022

2376

free(mc.current_server);

3023

2377

mc.current_server = next;

3024

2378

}

3025

2379

}

3026

2380

3027

/* Re-raise privileges */

2381

/* Re-raise priviliges */

3028

2382

{

3029

ret = raise_privileges();

3030

if(ret != 0){

3031

errno = ret;

3032

perror_plus("Failed to raise privileges");

3033

} else {

3034

3035

/* Run network hooks */

3036

run_network_hooks("stop", interfaces_hooks != NULL ?

3037

interfaces_hooks : "", delay);

3038

3039

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

3040

{

3041

char *interface = NULL;

3042

while((interface = argz_next(interfaces_to_take_down,

3043

interfaces_to_take_down_size,

3044

interface))){

3045

ret = take_down_interface(interface);

3046

if(ret != 0){

3047

errno = ret;

3048

perror_plus("Failed to take down interface");

3049

}

3050

}

3051

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

3052

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

3053

" down\n");

3054

}

3055

}

3056

}

3057

3058

ret = lower_privileges_permanently();

3059

if(ret != 0){

3060

errno = ret;

3061

perror_plus("Failed to lower privileges permanently");

3062

}

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();

3063

2407

}

3064

2408

3065

2409

free(interfaces_to_take_down);

3066

2410

free(interfaces_hooks);

3067

2411

3068

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

3069

uintmax_t level){

2412

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

2413

if(tempdir_created){

3070

2414

struct dirent **direntries = NULL;

3071

int dret;

3072

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

3073

O_RDONLY

3074

| O_NOFOLLOW

3075

| O_DIRECTORY

3076

| O_PATH));

3077

if(dir_fd == -1){

3078

perror_plus("open");

3079

return;

3080

}

3081

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

3082

notdotentries, alphasort);

3083

if(numentries >= 0){

2415

struct dirent *direntry = NULL;

2416

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

2417

alphasort);

2418

if (numentries > 0){

3084

2419

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

3085

if(debug){

3086

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

3087

dirname, direntries[i]->d_name);

3088

}

3089

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

3090

if(dret == -1){

3091

if(errno == EISDIR){

3092

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

3093

AT_REMOVEDIR);

3094

}

3095

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

3096

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

3097

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

3098

/* Recurse only in this special case */

3099

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

3100

dret = 0;

3101

}

3102

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

3103

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

3104

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

3105

}

3106

}

3107

free(direntries[i]);

3108

}

3109

3110

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

3111

free(direntries);

3112

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3113

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

3114

perror_plus("rmdir");

3115

}

3116

} else {

3117

perror_plus("scandirat");

3118

}

3119

close(dir_fd);

3120

}

3121

3122

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

3123

if(tempdir != NULL){

3124

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

}

3125

2446

}

3126

2447

3127

2448

if(quit_now){