/mandos/release : revision 237.7.497

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

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*

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* Everything else is

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*

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

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

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* 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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*

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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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* WITHOUT ANY WARRANTY; without even the implied warranty of

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* 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 this program. If not, see

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* <http://www.gnu.org/licenses/>.

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* along with Mandos. If not, see <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

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#endif /* not _LARGEFILE_SOURCE */

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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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(), remove() */

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stdout, ferror() */

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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 */

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

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

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

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asprintf(), strncpy(), strsignal()

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*/

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53

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

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

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

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64

*/

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65

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

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66

strtoimax() */

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

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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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program_invocation_short_name */

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

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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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#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() */

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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154

165

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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172

const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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/* 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 };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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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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}

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

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

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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

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}

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/*

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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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*/

209

__attribute__((nonnull, warn_unused_result))

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size_t incbuffer(char **buffer, size_t buffer_length,

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211

size_t buffer_capacity){

202

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

203

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

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if(buffer == NULL){

213

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

214

if(new_buf == NULL){

215

int old_errno = errno;

216

free(*buffer);

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errno = old_errno;

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*buffer = NULL;

205

219

return 0;

206

220

}

221

*buffer = new_buf;

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222

buffer_capacity += BUFFER_SIZE;

208

223

}

209

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return buffer_capacity;

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}

211

226

212

227

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

228

__attribute__((nonnull, warn_unused_result))

213

229

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

214

int af){

230

int af, server **current_server){

215

231

int ret;

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232

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

217

233

if(new_server == NULL){

224

240

.af = af };

225

241

if(new_server->ip == NULL){

226

242

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);

227

258

return false;

228

259

}

229

260

/* Special case of first server */

230

if (mc.current_server == NULL){

261

if(*current_server == NULL){

231

262

new_server->next = new_server;

232

263

new_server->prev = new_server;

233

mc.current_server = new_server;

234

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

264

*current_server = new_server;

235

265

} else {

236

new_server->next = mc.current_server;

237

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

266

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

267

new_server->next = *current_server;

268

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

238

269

new_server->prev->next = new_server;

239

mc.current_server->prev = new_server;

240

}

241

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

242

if(ret == -1){

243

perror_plus("clock_gettime");

244

return false;

270

(*current_server)->prev = new_server;

245

271

}

246

272

return true;

247

273

}

249

275

/*

250

276

* Initialize GPGME.

251

277

*/

252

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

253

const char *tempdir){

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){

254

283

gpgme_error_t rc;

255

284

gpgme_engine_info_t engine_info;

256

285

257

258

286

/*

259

287

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

260

288

*/

261

bool import_key(const char *filename){

289

bool import_key(const char * const filename){

262

290

int ret;

263

291

int fd;

264

292

gpgme_data_t pgp_data;

276

304

return false;

277

305

}

278

306

279

rc = gpgme_op_import(mc.ctx, pgp_data);

307

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

280

308

if(rc != GPG_ERR_NO_ERROR){

281

309

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

282

310

gpgme_strsource(rc), gpgme_strerror(rc));

283

311

return false;

284

312

}

313

{

314

gpgme_import_result_t import_result

315

= gpgme_op_import_result(mc->ctx);

316

if((import_result->imported < 1

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or import_result->not_imported > 0)

318

and import_result->unchanged == 0){

319

fprintf_plus(stderr, "bad gpgme_op_import_results:\n");

320

fprintf_plus(stderr,

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"The total number of considered keys: %d\n",

322

import_result->considered);

323

fprintf_plus(stderr,

324

"The number of keys without user ID: %d\n",

325

import_result->no_user_id);

326

fprintf_plus(stderr,

327

"The total number of imported keys: %d\n",

328

import_result->imported);

329

fprintf_plus(stderr, "The number of imported RSA keys: %d\n",

330

import_result->imported_rsa);

331

fprintf_plus(stderr, "The number of unchanged keys: %d\n",

332

import_result->unchanged);

333

fprintf_plus(stderr, "The number of new user IDs: %d\n",

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import_result->new_user_ids);

335

fprintf_plus(stderr, "The number of new sub keys: %d\n",

336

import_result->new_sub_keys);

337

fprintf_plus(stderr, "The number of new signatures: %d\n",

338

import_result->new_signatures);

339

fprintf_plus(stderr, "The number of new revocations: %d\n",

340

import_result->new_revocations);

341

fprintf_plus(stderr,

342

"The total number of secret keys read: %d\n",

343

import_result->secret_read);

344

fprintf_plus(stderr,

345

"The number of imported secret keys: %d\n",

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import_result->secret_imported);

347

fprintf_plus(stderr,

348

"The number of unchanged secret keys: %d\n",

349

import_result->secret_unchanged);

350

fprintf_plus(stderr, "The number of keys not imported: %d\n",

351

import_result->not_imported);

352

for(gpgme_import_status_t import_status

353

= import_result->imports;

354

import_status != NULL;

355

import_status = import_status->next){

356

fprintf_plus(stderr, "Import status for key: %s\n",

357

import_status->fpr);

358

if(import_status->result != GPG_ERR_NO_ERROR){

359

fprintf_plus(stderr, "Import result: %s: %s\n",

360

gpgme_strsource(import_status->result),

361

gpgme_strerror(import_status->result));

362

}

363

fprintf_plus(stderr, "Key status:\n");

364

fprintf_plus(stderr,

365

import_status->status & GPGME_IMPORT_NEW

366

? "The key was new.\n"

367

: "The key was not new.\n");

368

fprintf_plus(stderr,

369

import_status->status & GPGME_IMPORT_UID

370

? "The key contained new user IDs.\n"

371

: "The key did not contain new user IDs.\n");

372

fprintf_plus(stderr,

373

import_status->status & GPGME_IMPORT_SIG

374

? "The key contained new signatures.\n"

375

: "The key did not contain new signatures.\n");

376

fprintf_plus(stderr,

377

import_status->status & GPGME_IMPORT_SUBKEY

378

? "The key contained new sub keys.\n"

379

: "The key did not contain new sub keys.\n");

380

fprintf_plus(stderr,

381

import_status->status & GPGME_IMPORT_SECRET

382

? "The key contained a secret key.\n"

383

: "The key did not contain a secret key.\n");

384

}

385

return false;

386

}

387

}

285

388

286

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

389

ret = close(fd);

287

390

if(ret == -1){

288

391

perror_plus("close");

289

392

}

326

429

}

327

430

328

431

/* Create new GPGME "context" */

329

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

432

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

330

433

if(rc != GPG_ERR_NO_ERROR){

331

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

332

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

333

gpgme_strerror(rc));

434

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

435

gpgme_strsource(rc), gpgme_strerror(rc));

334

436

return false;

335

437

}

336

438

345

447

* Decrypt OpenPGP data.

346

448

* Returns -1 on error

347

449

*/

450

__attribute__((nonnull, warn_unused_result))

348

451

static ssize_t pgp_packet_decrypt(const char *cryptotext,

349

452

size_t crypto_size,

350

char **plaintext){

453

char **plaintext,

454

mandos_context *mc){

351

455

gpgme_data_t dh_crypto, dh_plain;

352

456

gpgme_error_t rc;

353

457

ssize_t ret;

370

474

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

371

475

rc = gpgme_data_new(&dh_plain);

372

476

if(rc != GPG_ERR_NO_ERROR){

373

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

374

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

477

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

375

478

gpgme_strsource(rc), gpgme_strerror(rc));

376

479

gpgme_data_release(dh_crypto);

377

480

return -1;

379

482

380

483

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

381

484

data buffer */

382

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

485

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

383

486

if(rc != GPG_ERR_NO_ERROR){

384

487

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

385

488

gpgme_strsource(rc), gpgme_strerror(rc));

386

489

plaintext_length = -1;

387

490

if(debug){

388

491

gpgme_decrypt_result_t result;

389

result = gpgme_op_decrypt_result(mc.ctx);

492

result = gpgme_op_decrypt_result(mc->ctx);

390

493

if(result == NULL){

391

494

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

392

495

} else {

393

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

394

result->unsupported_algorithm);

395

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

396

result->wrong_key_usage);

496

if(result->unsupported_algorithm != NULL) {

497

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

498

result->unsupported_algorithm);

499

}

500

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

501

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

397

502

if(result->file_name != NULL){

398

503

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

399

504

}

400

gpgme_recipient_t recipient;

401

recipient = result->recipients;

402

while(recipient != NULL){

505

506

for(gpgme_recipient_t r = result->recipients; r != NULL;

507

r = r->next){

403

508

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

404

gpgme_pubkey_algo_name

405

(recipient->pubkey_algo));

406

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

509

gpgme_pubkey_algo_name(r->pubkey_algo));

510

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

407

511

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

408

recipient->status == GPG_ERR_NO_SECKEY

409

? "No" : "Yes");

410

recipient = recipient->next;

512

r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");

411

513

}

412

514

}

413

515

}

469

571

return plaintext_length;

470

572

}

471

573

472

static const char * safer_gnutls_strerror(int value){

574

__attribute__((warn_unused_result, const))

575

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

576

if(str == NULL)

577

return "(unknown)";

578

return str;

579

}

580

581

__attribute__((warn_unused_result))

582

static const char *safer_gnutls_strerror(int value){

473

583

const char *ret = gnutls_strerror(value);

474

if(ret == NULL)

475

ret = "(unknown)";

476

return ret;

584

return safe_string(ret);

477

585

}

478

586

479

587

/* GnuTLS log function callback */

588

__attribute__((nonnull))

480

589

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

481

590

const char* string){

482

591

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

483

592

}

484

593

594

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

485

595

static int init_gnutls_global(const char *pubkeyfilename,

486

const char *seckeyfilename){

596

const char *seckeyfilename,

597

const char *dhparamsfilename,

598

mandos_context *mc){

487

599

int ret;

600

unsigned int uret;

488

601

489

602

if(debug){

490

603

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

491

604

}

492

605

493

ret = gnutls_global_init();

494

if(ret != GNUTLS_E_SUCCESS){

495

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

496

safer_gnutls_strerror(ret));

497

return -1;

498

}

499

500

606

if(debug){

501

607

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

502

608

* - GnuTLS manual

506

612

}

507

613

508

614

/* OpenPGP credentials */

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

615

ret = gnutls_certificate_allocate_credentials(&mc->cred);

510

616

if(ret != GNUTLS_E_SUCCESS){

511

617

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

512

618

safer_gnutls_strerror(ret));

513

gnutls_global_deinit();

514

619

return -1;

515

620

}

516

621

522

627

}

523

628

524

629

ret = gnutls_certificate_set_openpgp_key_file

525

(mc.cred, pubkeyfilename, seckeyfilename,

630

(mc->cred, pubkeyfilename, seckeyfilename,

526

631

GNUTLS_OPENPGP_FMT_BASE64);

527

632

if(ret != GNUTLS_E_SUCCESS){

528

633

fprintf_plus(stderr,

534

639

}

535

640

536

641

/* GnuTLS server initialization */

537

ret = gnutls_dh_params_init(&mc.dh_params);

642

ret = gnutls_dh_params_init(&mc->dh_params);

538

643

if(ret != GNUTLS_E_SUCCESS){

539

644

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

540

645

" initialization: %s\n",

541

646

safer_gnutls_strerror(ret));

542

647

goto globalfail;

543

648

}

544

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

545

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

548

goto globalfail;

549

}

550

551

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

649

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

650

if(dhparamsfilename != NULL){

651

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

652

do {

653

int dhpfile = open(dhparamsfilename, O_RDONLY);

654

if(dhpfile == -1){

655

perror_plus("open");

656

dhparamsfilename = NULL;

657

break;

658

}

659

size_t params_capacity = 0;

660

while(true){

661

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

662

(size_t)params.size,

663

(size_t)params_capacity);

664

if(params_capacity == 0){

665

perror_plus("incbuffer");

666

free(params.data);

667

params.data = NULL;

668

dhparamsfilename = NULL;

669

break;

670

}

671

ssize_t bytes_read = read(dhpfile,

672

params.data + params.size,

673

BUFFER_SIZE);

674

/* EOF */

675

if(bytes_read == 0){

676

break;

677

}

678

/* check bytes_read for failure */

679

if(bytes_read < 0){

680

perror_plus("read");

681

free(params.data);

682

params.data = NULL;

683

dhparamsfilename = NULL;

684

break;

685

}

686

params.size += (unsigned int)bytes_read;

687

}

688

ret = close(dhpfile);

689

if(ret == -1){

690

perror_plus("close");

691

}

692

if(params.data == NULL){

693

dhparamsfilename = NULL;

694

}

695

if(dhparamsfilename == NULL){

696

break;

697

}

698

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

699

GNUTLS_X509_FMT_PEM);

700

if(ret != GNUTLS_E_SUCCESS){

701

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

702

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

703

safer_gnutls_strerror(ret));

704

dhparamsfilename = NULL;

705

}

706

free(params.data);

707

} while(false);

708

}

709

if(dhparamsfilename == NULL){

710

if(mc->dh_bits == 0){

711

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

712

/* Try to read the private key file */

713

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

714

do {

715

int secfile = open(seckeyfilename, O_RDONLY);

716

if(secfile == -1){

717

perror_plus("open");

718

break;

719

}

720

size_t buffer_capacity = 0;

721

while(true){

722

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

723

(size_t)buffer.size,

724

(size_t)buffer_capacity);

725

if(buffer_capacity == 0){

726

perror_plus("incbuffer");

727

free(buffer.data);

728

buffer.data = NULL;

729

break;

730

}

731

ssize_t bytes_read = read(secfile,

732

buffer.data + buffer.size,

733

BUFFER_SIZE);

734

/* EOF */

735

if(bytes_read == 0){

736

break;

737

}

738

/* check bytes_read for failure */

739

if(bytes_read < 0){

740

perror_plus("read");

741

free(buffer.data);

742

buffer.data = NULL;

743

break;

744

}

745

buffer.size += (unsigned int)bytes_read;

746

}

747

close(secfile);

748

} while(false);

749

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

750

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

751

if(buffer.data != NULL){

752

{

753

gnutls_openpgp_privkey_t privkey = NULL;

754

ret = gnutls_openpgp_privkey_init(&privkey);

755

if(ret != GNUTLS_E_SUCCESS){

756

fprintf_plus(stderr, "Error initializing OpenPGP key"

757

" structure: %s",

758

safer_gnutls_strerror(ret));

759

free(buffer.data);

760

buffer.data = NULL;

761

} else {

762

ret = gnutls_openpgp_privkey_import

763

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

764

if(ret != GNUTLS_E_SUCCESS){

765

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

766

safer_gnutls_strerror(ret));

767

privkey = NULL;

768

}

769

free(buffer.data);

770

buffer.data = NULL;

771

if(privkey != NULL){

772

/* Use private key to suggest an appropriate

773

sec_param */

774

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

775

gnutls_openpgp_privkey_deinit(privkey);

776

if(debug){

777

fprintf_plus(stderr, "This OpenPGP key implies using"

778

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

779

safe_string(gnutls_sec_param_get_name

780

(sec_param)));

781

}

782

}

783

}

784

}

785

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

786

/* Err on the side of caution */

787

sec_param = GNUTLS_SEC_PARAM_ULTRA;

788

if(debug){

789

fprintf_plus(stderr, "Falling back to security parameter"

790

" \"%s\"\n",

791

safe_string(gnutls_sec_param_get_name

792

(sec_param)));

793

}

794

}

795

}

796

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

797

if(uret != 0){

798

mc->dh_bits = uret;

799

if(debug){

800

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

801

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

802

safe_string(gnutls_sec_param_get_name

803

(sec_param)),

804

mc->dh_bits);

805

}

806

} else {

807

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

808

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

809

safe_string(gnutls_sec_param_get_name

810

(sec_param)),

811

safer_gnutls_strerror(ret));

812

goto globalfail;

813

}

814

} else if(debug){

815

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

816

mc->dh_bits);

817

}

818

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

819

if(ret != GNUTLS_E_SUCCESS){

820

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

821

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

822

safer_gnutls_strerror(ret));

823

goto globalfail;

824

}

825

}

826

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

552

827

553

828

return 0;

554

829

555

830

globalfail:

556

831

557

gnutls_certificate_free_credentials(mc.cred);

558

gnutls_global_deinit();

559

gnutls_dh_params_deinit(mc.dh_params);

832

gnutls_certificate_free_credentials(mc->cred);

833

gnutls_dh_params_deinit(mc->dh_params);

560

834

return -1;

561

835

}

562

836

563

static int init_gnutls_session(gnutls_session_t *session){

837

__attribute__((nonnull, warn_unused_result))

838

static int init_gnutls_session(gnutls_session_t *session,

839

mandos_context *mc){

564

840

int ret;

565

841

/* GnuTLS session creation */

566

842

do {

578

854

{

579

855

const char *err;

580

856

do {

581

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

857

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

582

858

if(quit_now){

583

859

gnutls_deinit(*session);

584

860

return -1;

595

871

596

872

do {

597

873

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc.cred);

874

mc->cred);

599

875

if(quit_now){

600

876

gnutls_deinit(*session);

601

877

return -1;

611

887

/* ignore client certificate if any. */

612

888

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

889

614

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

615

616

890

return 0;

617

891

}

618

892

620

894

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

621

895

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

622

896

897

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

898

__attribute__((warn_unused_result))

899

int raise_privileges(void){

900

int old_errno = errno;

901

int ret = 0;

902

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

903

ret = errno;

904

}

905

errno = old_errno;

906

return ret;

907

}

908

909

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

910

__attribute__((warn_unused_result))

911

int raise_privileges_permanently(void){

912

int old_errno = errno;

913

int ret = raise_privileges();

914

if(ret != 0){

915

errno = old_errno;

916

return ret;

917

}

918

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

919

ret = errno;

920

}

921

errno = old_errno;

922

return ret;

923

}

924

925

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

926

__attribute__((warn_unused_result))

927

int lower_privileges(void){

928

int old_errno = errno;

929

int ret = 0;

930

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

931

ret = errno;

932

}

933

errno = old_errno;

934

return ret;

935

}

936

937

/* Lower privileges permanently */

938

__attribute__((warn_unused_result))

939

int lower_privileges_permanently(void){

940

int old_errno = errno;

941

int ret = 0;

942

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

943

ret = errno;

944

}

945

errno = old_errno;

946

return ret;

947

}

948

949

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

950

__attribute__((nonnull, warn_unused_result))

951

static bool add_delete_local_route(const bool add,

952

const char *address,

953

AvahiIfIndex if_index){

954

int ret;

955

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

956

char add_arg[] = "add";

957

char delete_arg[] = "delete";

958

char debug_flag[] = "--debug";

959

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

960

if(pluginhelperdir == NULL){

961

if(debug){

962

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

963

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

964

}

965

return false;

966

}

967

968

char interface[IF_NAMESIZE];

969

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

970

perror_plus("if_indextoname");

971

return false;

972

}

973

974

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

975

if(devnull == -1){

976

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

977

return false;

978

}

979

pid_t pid = fork();

980

if(pid == 0){

981

/* Child */

982

/* Raise privileges */

983

errno = raise_privileges_permanently();

984

if(errno != 0){

985

perror_plus("Failed to raise privileges");

986

/* _exit(EX_NOPERM); */

987

} else {

988

/* Set group */

989

errno = 0;

990

ret = setgid(0);

991

if(ret == -1){

992

perror_plus("setgid");

993

_exit(EX_NOPERM);

994

}

995

/* Reset supplementary groups */

996

errno = 0;

997

ret = setgroups(0, NULL);

998

if(ret == -1){

999

perror_plus("setgroups");

1000

_exit(EX_NOPERM);

1001

}

1002

}

1003

ret = dup2(devnull, STDIN_FILENO);

1004

if(ret == -1){

1005

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

1006

_exit(EX_OSERR);

1007

}

1008

ret = close(devnull);

1009

if(ret == -1){

1010

perror_plus("close");

1011

_exit(EX_OSERR);

1012

}

1013

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1014

if(ret == -1){

1015

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

1016

_exit(EX_OSERR);

1017

}

1018

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

1019

O_RDONLY

1020

| O_DIRECTORY

1021

| O_PATH

1022

| O_CLOEXEC));

1023

if(helperdir_fd == -1){

1024

perror_plus("open");

1025

_exit(EX_UNAVAILABLE);

1026

}

1027

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

1028

helper, O_RDONLY));

1029

if(helper_fd == -1){

1030

perror_plus("openat");

1031

close(helperdir_fd);

1032

_exit(EX_UNAVAILABLE);

1033

}

1034

close(helperdir_fd);

1035

#ifdef __GNUC__

1036

#pragma GCC diagnostic push

1037

#pragma GCC diagnostic ignored "-Wcast-qual"

1038

#endif

1039

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

1040

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

1041

interface, debug ? debug_flag : NULL, NULL },

1042

environ) == -1){

1043

#ifdef __GNUC__

1044

#pragma GCC diagnostic pop

1045

#endif

1046

perror_plus("fexecve");

1047

_exit(EXIT_FAILURE);

1048

}

1049

}

1050

if(pid == -1){

1051

perror_plus("fork");

1052

return false;

1053

}

1054

int status;

1055

pid_t pret = -1;

1056

errno = 0;

1057

do {

1058

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

1059

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

1060

int errno_raising = 0;

1061

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

1062

errno_raising = errno;

1063

perror_plus("Failed to raise privileges in order to"

1064

" kill helper program");

1065

}

1066

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

1067

perror_plus("kill");

1068

}

1069

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

1070

perror_plus("Failed to lower privileges after killing"

1071

" helper program");

1072

}

1073

return false;

1074

}

1075

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

1076

if(pret == -1){

1077

perror_plus("waitpid");

1078

return false;

1079

}

1080

if(WIFEXITED(status)){

1081

if(WEXITSTATUS(status) != 0){

1082

fprintf_plus(stderr, "Error: iprouteadddel exited"

1083

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

1084

return false;

1085

}

1086

return true;

1087

}

1088

if(WIFSIGNALED(status)){

1089

fprintf_plus(stderr, "Error: iprouteadddel died by"

1090

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

1091

return false;

1092

}

1093

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

1094

return false;

1095

}

1096

1097

__attribute__((nonnull, warn_unused_result))

1098

static bool add_local_route(const char *address,

1099

AvahiIfIndex if_index){

1100

if(debug){

1101

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

1102

}

1103

return add_delete_local_route(true, address, if_index);

1104

}

1105

1106

__attribute__((nonnull, warn_unused_result))

1107

static bool delete_local_route(const char *address,

1108

AvahiIfIndex if_index){

1109

if(debug){

1110

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

1111

}

1112

return add_delete_local_route(false, address, if_index);

1113

}

1114

623

1115

/* Called when a Mandos server is found */

1116

__attribute__((nonnull, warn_unused_result))

624

1117

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

625

1118

AvahiIfIndex if_index,

626

int af){

1119

int af, mandos_context *mc){

627

1120

int ret, tcp_sd = -1;

628

1121

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

1122

struct sockaddr_storage to;

633

1123

char *buffer = NULL;

634

1124

char *decrypted_buffer = NULL;

635

1125

size_t buffer_length = 0;

638

1128

int retval = -1;

639

1129

gnutls_session_t session;

640

1130

int pf; /* Protocol family */

1131

bool route_added = false;

641

1132

642

1133

errno = 0;

643

1134

659

1150

return -1;

660

1151

}

661

1152

662

ret = init_gnutls_session(&session);

1153

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

1154

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

1155

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

1156

bool match = false;

1157

{

1158

char *interface = NULL;

1159

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

1160

mc->interfaces_size,

1161

interface))){

1162

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

1163

match = true;

1164

break;

1165

}

1166

}

1167

}

1168

if(not match){

1169

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

1170

connect to the server */

1171

if(debug){

1172

char interface[IF_NAMESIZE];

1173

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

1174

perror_plus("if_indextoname");

1175

} else {

1176

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

1177

" \"%s\"\n",

1178

if_indextoname((unsigned int)if_index,

1179

interface));

1180

}

1181

}

1182

return -1;

1183

}

1184

}

1185

1186

ret = init_gnutls_session(&session, mc);

663

1187

if(ret != 0){

664

1188

return -1;

665

1189

}

669

1193

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

670

1194

}

671

1195

672

tcp_sd = socket(pf, SOCK_STREAM, 0);

1196

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

673

1197

if(tcp_sd < 0){

674

1198

int e = errno;

675

1199

perror_plus("socket");

682

1206

goto mandos_end;

683

1207

}

684

1208

685

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

686

1209

if(af == AF_INET6){

687

to.in6.sin6_family = (sa_family_t)af;

688

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

1210

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

1211

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

1212

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

689

1213

} else { /* IPv4 */

690

to.in.sin_family = (sa_family_t)af;

691

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

1214

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

1215

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

1216

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

692

1217

}

693

1218

if(ret < 0 ){

694

1219

int e = errno;

703

1228

goto mandos_end;

704

1229

}

705

1230

if(af == AF_INET6){

706

to.in6.sin6_port = htons(port);

707

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

708

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

709

-Wunreachable-code*/

1231

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

1232

if(IN6_IS_ADDR_LINKLOCAL

1233

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

710

1234

if(if_index == AVAHI_IF_UNSPEC){

711

1235

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

712

1236

" incomplete without a network interface\n");

714

1238

goto mandos_end;

715

1239

}

716

1240

/* Set the network interface number as scope */

717

to.in6.sin6_scope_id = (uint32_t)if_index;

1241

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

718

1242

}

719

1243

} else {

720

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

721

-Wconversion and

722

-Wunreachable-code */

1244

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

723

1245

}

724

1246

725

1247

if(quit_now){

742

1264

}

743

1265

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

744

1266

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

745

const char *pcret;

746

if(af == AF_INET6){

747

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

748

sizeof(addrstr));

749

} else {

750

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

751

sizeof(addrstr));

752

}

753

if(pcret == NULL){

754

perror_plus("inet_ntop");

755

} else {

756

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

757

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

758

}

759

}

760

}

761

762

if(quit_now){

763

errno = EINTR;

764

goto mandos_end;

765

}

766

767

if(af == AF_INET6){

768

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

769

} else {

770

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

771

}

772

if(ret < 0){

773

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

774

int e = errno;

775

perror_plus("connect");

776

errno = e;

777

}

778

goto mandos_end;

779

}

780

781

if(quit_now){

782

errno = EINTR;

783

goto mandos_end;

1267

if(af == AF_INET6){

1268

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

1269

sizeof(struct sockaddr_in6),

1270

addrstr, sizeof(addrstr), NULL, 0,

1271

NI_NUMERICHOST);

1272

} else {

1273

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

1274

sizeof(struct sockaddr_in),

1275

addrstr, sizeof(addrstr), NULL, 0,

1276

NI_NUMERICHOST);

1277

}

1278

if(ret == EAI_SYSTEM){

1279

perror_plus("getnameinfo");

1280

} else if(ret != 0) {

1281

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

1282

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

1283

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

1284

}

1285

}

1286

1287

if(quit_now){

1288

errno = EINTR;

1289

goto mandos_end;

1290

}

1291

1292

while(true){

1293

if(af == AF_INET6){

1294

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

1295

sizeof(struct sockaddr_in6));

1296

} else {

1297

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

1298

sizeof(struct sockaddr_in));

1299

}

1300

if(ret < 0){

1301

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

1302

and if_index != AVAHI_IF_UNSPEC

1303

and connect_to == NULL

1304

and not route_added and

1305

((af == AF_INET6 and not

1306

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1307

&to)->sin6_addr)))

1308

or (af == AF_INET and

1309

/* Not a a IPv4LL address */

1310

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

1311

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

1312

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

1313

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

1314

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

1315

connect to a Mandos server announced by Avahi on a server

1316

host with a global address. Work around this by retrying

1317

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

1318

1319

Avahi bug reference:

1320

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

1321

https://bugs.debian.org/587961

1322

*/

1323

if(debug){

1324

fprintf_plus(stderr, "Mandos server unreachable, trying"

1325

" direct route\n");

1326

}

1327

int e = errno;

1328

route_added = add_local_route(ip, if_index);

1329

if(route_added){

1330

continue;

1331

}

1332

errno = e;

1333

}

1334

if(errno != ECONNREFUSED or debug){

1335

int e = errno;

1336

perror_plus("connect");

1337

errno = e;

1338

}

1339

goto mandos_end;

1340

}

1341

1342

if(quit_now){

1343

errno = EINTR;

1344

goto mandos_end;

1345

}

1346

break;

784

1347

}

785

1348

786

1349

const char *out = mandos_protocol_version;

937

1500

if(buffer_length > 0){

938

1501

ssize_t decrypted_buffer_size;

939

1502

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

940

&decrypted_buffer);

1503

&decrypted_buffer, mc);

941

1504

if(decrypted_buffer_size >= 0){

942

1505

1506

clearerr(stdout);

943

1507

written = 0;

944

1508

while(written < (size_t) decrypted_buffer_size){

945

1509

if(quit_now){

961

1525

}

962

1526

written += (size_t)ret;

963

1527

}

1528

ret = fflush(stdout);

1529

if(ret != 0){

1530

int e = errno;

1531

if(debug){

1532

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

1533

strerror(errno));

1534

}

1535

errno = e;

1536

goto mandos_end;

1537

}

964

1538

retval = 0;

965

1539

}

966

1540

}

969

1543

970

1544

mandos_end:

971

1545

{

1546

if(route_added){

1547

if(not delete_local_route(ip, if_index)){

1548

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

1549

" interface %d", ip, if_index);

1550

}

1551

}

972

1552

int e = errno;

973

1553

free(decrypted_buffer);

974

1554

free(buffer);

975

1555

if(tcp_sd >= 0){

976

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

1556

ret = close(tcp_sd);

977

1557

}

978

1558

if(ret == -1){

979

1559

if(e == 0){

1004

1584

AVAHI_GCC_UNUSED AvahiStringList *txt,

1005

1585

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

1586

flags,

1007

AVAHI_GCC_UNUSED void* userdata){

1587

void *mc){

1008

1588

if(r == NULL){

1009

1589

return;

1010

1590

}

1013

1593

timed out */

1014

1594

1015

1595

if(quit_now){

1596

avahi_s_service_resolver_free(r);

1016

1597

return;

1017

1598

}

1018

1599

1022

1603

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

1023

1604

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

1024

1605

domain,

1025

avahi_strerror(avahi_server_errno(mc.server)));

1606

avahi_strerror(avahi_server_errno

1607

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

1026

1608

break;

1027

1609

1028

1610

case AVAHI_RESOLVER_FOUND:

1036

1618

}

1037

1619

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

1038

1620

interface,

1039

avahi_proto_to_af(proto));

1621

avahi_proto_to_af(proto),

1622

mc);

1040

1623

if(ret == 0){

1041

avahi_simple_poll_quit(mc.simple_poll);

1624

avahi_simple_poll_quit(simple_poll);

1042

1625

} else {

1043

1626

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

1044

avahi_proto_to_af(proto))){

1627

avahi_proto_to_af(proto),

1628

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

1045

1629

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

1046

1630

" list\n", name);

1047

1631

}

1060

1644

const char *domain,

1061

1645

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

1646

flags,

1063

AVAHI_GCC_UNUSED void* userdata){

1647

void *mc){

1064

1648

if(b == NULL){

1065

1649

return;

1066

1650

}

1077

1661

case AVAHI_BROWSER_FAILURE:

1078

1662

1079

1663

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1664

avahi_strerror(avahi_server_errno

1665

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

1666

avahi_simple_poll_quit(simple_poll);

1082

1667

return;

1083

1668

1084

1669

case AVAHI_BROWSER_NEW:

1087

1672

the callback function is called the Avahi server will free the

1088

1673

resolver for us. */

1089

1674

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1675

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

1676

interface, protocol, name, type,

1677

domain, protocol, 0,

1678

resolve_callback, mc) == NULL)

1093

1679

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

1094

1680

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1681

avahi_strerror(avahi_server_errno

1682

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

1096

1683

break;

1097

1684

1098

1685

case AVAHI_BROWSER_REMOVE:

1117

1704

signal_received = sig;

1118

1705

int old_errno = errno;

1119

1706

/* set main loop to exit */

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1707

if(simple_poll != NULL){

1708

avahi_simple_poll_quit(simple_poll);

1122

1709

}

1123

1710

errno = old_errno;

1124

1711

}

1125

1712

1713

__attribute__((nonnull, warn_unused_result))

1126

1714

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

1127

1715

int ret;

1128

error_t ret_errno;

1716

int old_errno;

1129

1717

1130

1718

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

1131

1719

if(s < 0){

1132

ret_errno = errno;

1720

old_errno = errno;

1133

1721

perror_plus("socket");

1134

errno = ret_errno;

1722

errno = old_errno;

1135

1723

return false;

1136

1724

}

1137

strcpy(ifr->ifr_name, ifname);

1725

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

1726

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

1138

1727

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1139

1728

if(ret == -1){

1140

1729

if(debug){

1141

ret_errno = errno;

1730

old_errno = errno;

1142

1731

perror_plus("ioctl SIOCGIFFLAGS");

1143

errno = ret_errno;

1732

errno = old_errno;

1733

}

1734

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

1735

old_errno = errno;

1736

perror_plus("close");

1737

errno = old_errno;

1144

1738

}

1145

1739

return false;

1146

1740

}

1741

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

1742

old_errno = errno;

1743

perror_plus("close");

1744

errno = old_errno;

1745

}

1147

1746

return true;

1148

1747

}

1149

1748

1749

__attribute__((nonnull, warn_unused_result))

1150

1750

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

1151

1751

1152

1752

/* Reject the loopback device */

1194

1794

* corresponds to an acceptable network device.

1195

1795

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

1196

1796

*/

1797

__attribute__((nonnull, warn_unused_result))

1197

1798

int good_interface(const struct dirent *if_entry){

1198

1799

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

1199

1800

return 0;

1217

1818

/*

1218

1819

* This function determines if a network interface is up.

1219

1820

*/

1821

__attribute__((nonnull, warn_unused_result))

1220

1822

bool interface_is_up(const char *interface){

1221

1823

struct ifreq ifr;

1222

1824

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

1233

1835

/*

1234

1836

* This function determines if a network interface is running

1235

1837

*/

1838

__attribute__((nonnull, warn_unused_result))

1236

1839

bool interface_is_running(const char *interface){

1237

1840

struct ifreq ifr;

1238

1841

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

1246

1849

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

1247

1850

}

1248

1851

1852

__attribute__((nonnull, pure, warn_unused_result))

1249

1853

int notdotentries(const struct dirent *direntry){

1250

1854

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

1251

1855

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

1258

1862

}

1259

1863

1260

1864

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

1865

__attribute__((nonnull, warn_unused_result))

1261

1866

int runnable_hook(const struct dirent *direntry){

1262

1867

int ret;

1263

1868

size_t sret;

1271

1876

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

1272

1877

"abcdefghijklmnopqrstuvwxyz"

1273

1878

"0123456789"

1274

"_-");

1879

"_.-");

1275

1880

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

1276

1881

/* Contains non-allowed characters */

1277

1882

if(debug){

1281

1886

return 0;

1282

1887

}

1283

1888

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);

1889

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

1292

1890

if(ret == -1){

1293

1891

if(debug){

1294

1892

perror_plus("Could not stat hook");

1318

1916

return 1;

1319

1917

}

1320

1918

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1919

__attribute__((nonnull, warn_unused_result))

1920

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1921

mandos_context *mc){

1322

1922

int ret;

1323

1923

struct timespec now;

1324

1924

struct timespec waited_time;

1325

1925

intmax_t block_time;

1326

1926

1327

1927

while(true){

1328

if(mc.current_server == NULL){

1329

if (debug){

1928

if(mc->current_server == NULL){

1929

if(debug){

1330

1930

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

1331

1931

" No timeout!\n");

1332

1932

}

1333

1933

ret = avahi_simple_poll_iterate(s, -1);

1334

1934

} else {

1335

if (debug){

1935

if(debug){

1336

1936

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

1337

1937

" it, or wait\n");

1338

1938

}

1345

1945

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

1346

1946

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

1347

1947

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1948

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

1349

1949

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1950

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

1351

1951

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

1352

1952

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

1353

1953

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

1355

1955

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

1356

1956

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

1357

1957

1358

if (debug){

1958

if(debug){

1359

1959

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

1360

1960

block_time);

1361

1961

}

1362

1962

1363

1963

if(block_time <= 0){

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);

1964

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

1965

mc->current_server->port,

1966

mc->current_server->if_index,

1967

mc->current_server->af, mc);

1368

1968

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1969

avahi_simple_poll_quit(s);

1370

1970

return 0;

1371

1971

}

1372

1972

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1973

&mc->current_server->last_seen);

1374

1974

if(ret == -1){

1375

1975

perror_plus("clock_gettime");

1376

1976

return -1;

1377

1977

}

1378

mc.current_server = mc.current_server->next;

1978

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

1379

1979

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

1380

1980

servers, but don't block */

1381

1981

}

1383

1983

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

1384

1984

}

1385

1985

if(ret != 0){

1386

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

1986

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

1387

1987

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

1388

1988

}

1389

1989

}

1390

1990

}

1391

1991

}

1392

1992

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,

1993

__attribute__((nonnull))

1994

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

1446

1995

const float delay){

1447

struct dirent **direntries;

1996

struct dirent **direntries = NULL;

1997

if(hookdir_fd == -1){

1998

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1999

| O_CLOEXEC);

2000

if(hookdir_fd == -1){

2001

if(errno == ENOENT){

2002

if(debug){

2003

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

2004

" found\n", hookdir);

2005

}

2006

} else {

2007

perror_plus("open");

2008

}

2009

return;

2010

}

2011

}

2012

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

2013

if(devnull == -1){

2014

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

2015

return;

2016

}

2017

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

2018

runnable_hook, alphasort);

2019

if(numhooks == -1){

2020

perror_plus("scandir");

2021

close(devnull);

2022

return;

2023

}

1448

2024

struct dirent *direntry;

1449

2025

int ret;

1450

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

1451

alphasort);

1452

if(numhooks == -1){

1453

if(errno == ENOENT){

1454

if(debug){

1455

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

1456

" found\n", hookdir);

1457

}

1458

} else {

1459

perror_plus("scandir");

2026

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

2027

direntry = direntries[i];

2028

if(debug){

2029

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

2030

direntry->d_name);

1460

2031

}

1461

} else {

1462

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

1463

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

1464

direntry = direntries[i];

1465

char *fullname = NULL;

1466

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

1467

if(ret < 0){

2032

pid_t hook_pid = fork();

2033

if(hook_pid == 0){

2034

/* Child */

2035

/* Raise privileges */

2036

errno = raise_privileges_permanently();

2037

if(errno != 0){

2038

perror_plus("Failed to raise privileges");

2039

_exit(EX_NOPERM);

2040

}

2041

/* Set group */

2042

errno = 0;

2043

ret = setgid(0);

2044

if(ret == -1){

2045

perror_plus("setgid");

2046

_exit(EX_NOPERM);

2047

}

2048

/* Reset supplementary groups */

2049

errno = 0;

2050

ret = setgroups(0, NULL);

2051

if(ret == -1){

2052

perror_plus("setgroups");

2053

_exit(EX_NOPERM);

2054

}

2055

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

2056

if(ret == -1){

2057

perror_plus("setenv");

2058

_exit(EX_OSERR);

2059

}

2060

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

2061

if(ret == -1){

2062

perror_plus("setenv");

2063

_exit(EX_OSERR);

2064

}

2065

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

2066

if(ret == -1){

2067

perror_plus("setenv");

2068

_exit(EX_OSERR);

2069

}

2070

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

2071

if(ret == -1){

2072

perror_plus("setenv");

2073

_exit(EX_OSERR);

2074

}

2075

char *delaystring;

2076

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

2077

if(ret == -1){

1468

2078

perror_plus("asprintf");

1469

continue;

1470

}

1471

if(debug){

1472

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

1473

direntry->d_name);

1474

}

1475

pid_t hook_pid = fork();

1476

if(hook_pid == 0){

1477

/* Child */

1478

/* Raise privileges */

1479

raise_privileges_permanently();

1480

/* Set group */

1481

errno = 0;

1482

ret = setgid(0);

1483

if(ret == -1){

1484

perror_plus("setgid");

1485

}

1486

/* Reset supplementary groups */

1487

errno = 0;

1488

ret = setgroups(0, NULL);

1489

if(ret == -1){

1490

perror_plus("setgroups");

1491

}

1492

dup2(devnull, STDIN_FILENO);

1493

close(devnull);

1494

dup2(STDERR_FILENO, STDOUT_FILENO);

1495

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

1496

if(ret == -1){

1497

perror_plus("setenv");

1498

_exit(EX_OSERR);

1499

}

1500

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

1501

if(ret == -1){

1502

perror_plus("setenv");

1503

_exit(EX_OSERR);

1504

}

1505

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

1506

if(ret == -1){

1507

perror_plus("setenv");

1508

_exit(EX_OSERR);

1509

}

1510

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

1511

if(ret == -1){

1512

perror_plus("setenv");

1513

_exit(EX_OSERR);

1514

}

1515

char *delaystring;

1516

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

1517

if(ret == -1){

1518

perror_plus("asprintf");

1519

_exit(EX_OSERR);

1520

}

1521

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

1522

if(ret == -1){

1523

free(delaystring);

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

2079

_exit(EX_OSERR);

2080

}

2081

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

2082

if(ret == -1){

1527

2083

free(delaystring);

1528

if(connect_to != NULL){

1529

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

1530

if(ret == -1){

1531

perror_plus("setenv");

1532

_exit(EX_OSERR);

1533

}

1534

}

1535

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

1536

perror_plus("execl");

1537

_exit(EXIT_FAILURE);

1538

}

2084

perror_plus("setenv");

2085

_exit(EX_OSERR);

2086

}

2087

free(delaystring);

2088

if(connect_to != NULL){

2089

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

2090

if(ret == -1){

2091

perror_plus("setenv");

2092

_exit(EX_OSERR);

2093

}

2094

}

2095

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

2096

direntry->d_name,

2097

O_RDONLY));

2098

if(hook_fd == -1){

2099

perror_plus("openat");

2100

_exit(EXIT_FAILURE);

2101

}

2102

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

2103

perror_plus("close");

2104

_exit(EXIT_FAILURE);

2105

}

2106

ret = dup2(devnull, STDIN_FILENO);

2107

if(ret == -1){

2108

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

2109

_exit(EX_OSERR);

2110

}

2111

ret = close(devnull);

2112

if(ret == -1){

2113

perror_plus("close");

2114

_exit(EX_OSERR);

2115

}

2116

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2117

if(ret == -1){

2118

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

2119

_exit(EX_OSERR);

2120

}

2121

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

2122

environ) == -1){

2123

perror_plus("fexecve");

2124

_exit(EXIT_FAILURE);

2125

}

2126

} else {

2127

if(hook_pid == -1){

2128

perror_plus("fork");

2129

free(direntry);

2130

continue;

2131

}

2132

int status;

2133

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

2134

perror_plus("waitpid");

2135

free(direntry);

2136

continue;

2137

}

2138

if(WIFEXITED(status)){

2139

if(WEXITSTATUS(status) != 0){

2140

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

2141

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

2142

WEXITSTATUS(status));

2143

free(direntry);

2144

continue;

2145

}

2146

} else if(WIFSIGNALED(status)){

2147

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

2148

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

2149

WTERMSIG(status));

2150

free(direntry);

2151

continue;

1539

2152

} else {

1540

int status;

1541

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

1542

perror_plus("waitpid");

1543

free(fullname);

1544

continue;

1545

}

1546

if(WIFEXITED(status)){

1547

if(WEXITSTATUS(status) != 0){

1548

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

1549

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

1550

WEXITSTATUS(status));

1551

free(fullname);

1552

continue;

1553

}

1554

} else if(WIFSIGNALED(status)){

1555

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

1556

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

1557

WTERMSIG(status));

1558

free(fullname);

1559

continue;

1560

} else {

1561

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

1562

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

1563

free(fullname);

1564

continue;

1565

}

1566

}

1567

free(fullname);

1568

if(debug){

1569

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

1570

direntry->d_name);

1571

}

1572

}

1573

close(devnull);

1574

}

1575

return true;

2153

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

2154

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

2155

free(direntry);

2156

continue;

2157

}

2158

}

2159

if(debug){

2160

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

2161

direntry->d_name);

2162

}

2163

free(direntry);

2164

}

2165

free(direntries);

2166

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

2167

perror_plus("close");

2168

} else {

2169

hookdir_fd = -1;

2170

}

2171

close(devnull);

1576

2172

}

1577

2173

1578

error_t bring_up_interface(const char *const interface,

1579

const float delay){

1580

int sd = -1;

1581

error_t old_errno = errno;

1582

error_t ret_errno = 0;

1583

int ret, ret_setflags;

2174

__attribute__((nonnull, warn_unused_result))

2175

int bring_up_interface(const char *const interface,

2176

const float delay){

2177

int old_errno = errno;

2178

int ret;

1584

2179

struct ifreq network;

1585

2180

unsigned int if_index = if_nametoindex(interface);

1586

2181

if(if_index == 0){

1595

2190

}

1596

2191

1597

2192

if(not interface_is_up(interface)){

1598

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

2193

int ret_errno = 0;

2194

int ioctl_errno = 0;

2195

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

1599

2196

ret_errno = errno;

1600

2197

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

1601

2198

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

2199

errno = old_errno;

1602

2200

return ret_errno;

1603

2201

}

1604

network.ifr_flags |= IFF_UP;

2202

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

1605

2203

1606

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1607

if(sd < 0){

2204

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

2205

if(sd == -1){

1608

2206

ret_errno = errno;

1609

2207

perror_plus("socket");

1610

2208

errno = old_errno;

1611

2209

return ret_errno;

1612

2210

}

1613

2211

1614

2212

if(quit_now){

1615

close(sd);

2213

ret = close(sd);

2214

if(ret == -1){

2215

perror_plus("close");

2216

}

1616

2217

errno = old_errno;

1617

2218

return EINTR;

1618

2219

}

1622

2223

interface);

1623

2224

}

1624

2225

1625

/* Raise priviliges */

1626

raise_privileges();

2226

/* Raise privileges */

2227

ret_errno = raise_privileges();

2228

if(ret_errno != 0){

2229

errno = ret_errno;

2230

perror_plus("Failed to raise privileges");

2231

}

1627

2232

1628

2233

#ifdef __linux__

1629

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1630

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

1631

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

1632

bool restore_loglevel = true;

1633

if(ret_linux == -1){

1634

restore_loglevel = false;

1635

perror_plus("klogctl");

2234

int ret_linux;

2235

bool restore_loglevel = false;

2236

if(ret_errno == 0){

2237

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2238

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

2239

ret_linux = klogctl(8, NULL, 5);

2240

if(ret_linux == -1){

2241

perror_plus("klogctl");

2242

} else {

2243

restore_loglevel = true;

2244

}

1636

2245

}

1637

2246

#endif /* __linux__ */

1638

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

1639

ret_errno = errno;

2247

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

2248

ioctl_errno = errno;

1640

2249

#ifdef __linux__

1641

2250

if(restore_loglevel){

1642

2251

ret_linux = klogctl(7, NULL, 0);

1646

2255

}

1647

2256

#endif /* __linux__ */

1648

2257

1649

/* Lower privileges */

1650

lower_privileges();

2258

/* If raise_privileges() succeeded above */

2259

if(ret_errno == 0){

2260

/* Lower privileges */

2261

ret_errno = lower_privileges();

2262

if(ret_errno != 0){

2263

errno = ret_errno;

2264

perror_plus("Failed to lower privileges");

2265

}

2266

}

1651

2267

1652

2268

/* Close the socket */

1653

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

2269

ret = close(sd);

1654

2270

if(ret == -1){

1655

2271

perror_plus("close");

1656

2272

}

1657

2273

1658

2274

if(ret_setflags == -1){

1659

errno = ret_errno;

2275

errno = ioctl_errno;

1660

2276

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1661

2277

errno = old_errno;

1662

return ret_errno;

2278

return ioctl_errno;

1663

2279

}

1664

2280

} else if(debug){

1665

2281

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

1668

2284

1669

2285

/* Sleep checking until interface is running.

1670

2286

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

1671

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

2287

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

1672

2288

if(interface_is_running(interface)){

1673

2289

break;

1674

2290

}

1683

2299

return 0;

1684

2300

}

1685

2301

1686

error_t take_down_interface(const char *const interface){

1687

int sd = -1;

1688

error_t old_errno = errno;

1689

error_t ret_errno = 0;

1690

int ret, ret_setflags;

2302

__attribute__((nonnull, warn_unused_result))

2303

int take_down_interface(const char *const interface){

2304

int old_errno = errno;

1691

2305

struct ifreq network;

1692

2306

unsigned int if_index = if_nametoindex(interface);

1693

2307

if(if_index == 0){

1696

2310

return ENXIO;

1697

2311

}

1698

2312

if(interface_is_up(interface)){

2313

int ret_errno = 0;

2314

int ioctl_errno = 0;

1699

2315

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

1700

2316

ret_errno = errno;

1701

2317

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

1702

2318

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

2319

errno = old_errno;

1703

2320

return ret_errno;

1704

2321

}

1705

2322

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

1706

2323

1707

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1708

if(sd < 0){

2324

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

2325

if(sd == -1){

1709

2326

ret_errno = errno;

1710

2327

perror_plus("socket");

1711

2328

errno = old_errno;

1717

2334

interface);

1718

2335

}

1719

2336

1720

/* Raise priviliges */

1721

raise_privileges();

1722

1723

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

1724

ret_errno = errno;

1725

1726

/* Lower privileges */

1727

lower_privileges();

2337

/* Raise privileges */

2338

ret_errno = raise_privileges();

2339

if(ret_errno != 0){

2340

errno = ret_errno;

2341

perror_plus("Failed to raise privileges");

2342

}

2343

2344

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

2345

ioctl_errno = errno;

2346

2347

/* If raise_privileges() succeeded above */

2348

if(ret_errno == 0){

2349

/* Lower privileges */

2350

ret_errno = lower_privileges();

2351

if(ret_errno != 0){

2352

errno = ret_errno;

2353

perror_plus("Failed to lower privileges");

2354

}

2355

}

1728

2356

1729

2357

/* Close the socket */

1730

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

2358

int ret = close(sd);

1731

2359

if(ret == -1){

1732

2360

perror_plus("close");

1733

2361

}

1734

2362

1735

2363

if(ret_setflags == -1){

1736

errno = ret_errno;

2364

errno = ioctl_errno;

1737

2365

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1738

2366

errno = old_errno;

1739

return ret_errno;

2367

return ioctl_errno;

1740

2368

}

1741

2369

} else if(debug){

1742

2370

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

1748

2376

}

1749

2377

1750

2378

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

2379

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

2380

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

2381

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

2382

.current_server = NULL, .interfaces = NULL,

2383

.interfaces_size = 0 };

1751

2384

AvahiSServiceBrowser *sb = NULL;

1752

2385

error_t ret_errno;

1753

2386

int ret;

1754

2387

intmax_t tmpmax;

1755

2388

char *tmp;

1756

2389

int exitcode = EXIT_SUCCESS;

1757

char *interfaces = NULL;

1758

size_t interfaces_size = 0;

1759

2390

char *interfaces_to_take_down = NULL;

1760

2391

size_t interfaces_to_take_down_size = 0;

1761

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

1762

bool tempdir_created = false;

2392

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

2393

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

2394

char *tempdir = NULL;

1763

2395

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1764

2396

const char *seckey = PATHDIR "/" SECKEY;

1765

2397

const char *pubkey = PATHDIR "/" PUBKEY;

2398

const char *dh_params_file = NULL;

1766

2399

char *interfaces_hooks = NULL;

1767

size_t interfaces_hooks_size = 0;

1768

2400

1769

2401

bool gnutls_initialized = false;

1770

2402

bool gpgme_initialized = false;

1822

2454

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

1823

2455

" Diffie-Hellman key exchange",

1824

2456

.group = 2 },

2457

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

2458

.arg = "FILE",

2459

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

2460

" for the Diffie-Hellman key exchange",

2461

.group = 2 },

1825

2462

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

1826

2463

.arg = "STRING",

1827

2464

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

1861

2498

connect_to = arg;

1862

2499

break;

1863

2500

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

1864

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

1865

(int)',');

2501

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

2502

arg, (int)',');

1866

2503

if(ret_errno != 0){

1867

2504

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

1868

2505

}

1882

2519

}

1883

2520

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

1884

2521

break;

2522

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

2523

dh_params_file = arg;

2524

break;

1885

2525

case 130: /* --priority */

1886

2526

mc.priority = arg;

1887

2527

break;

1927

2567

.args_doc = "",

1928

2568

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

1929

2569

" passwords from a Mandos server" };

1930

ret = argp_parse(&argp, argc, argv,

1931

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1932

switch(ret){

2570

ret_errno = argp_parse(&argp, argc, argv,

2571

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2572

switch(ret_errno){

1933

2573

case 0:

1934

2574

break;

1935

2575

case ENOMEM:

1936

2576

default:

1937

errno = ret;

2577

errno = ret_errno;

1938

2578

perror_plus("argp_parse");

1939

2579

exitcode = EX_OSERR;

1940

2580

goto end;

1943

2583

goto end;

1944

2584

}

1945

2585

}

1946

2586

1947

2587

{

1948

2588

/* Work around Debian bug #633582:

1949

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

2589

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

1950

2590

1951

/* Re-raise priviliges */

1952

if(raise_privileges() == 0){

2591

/* Re-raise privileges */

2592

ret = raise_privileges();

2593

if(ret != 0){

2594

errno = ret;

2595

perror_plus("Failed to raise privileges");

2596

} else {

1953

2597

struct stat st;

1954

2598

1955

2599

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

1969

2613

}

1970

2614

}

1971

2615

}

1972

TEMP_FAILURE_RETRY(close(seckey_fd));

2616

close(seckey_fd);

1973

2617

}

1974

2618

}

1975

2619

1976

2620

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

1977

2621

int pubkey_fd = open(pubkey, O_RDONLY);

1978

2622

if(pubkey_fd == -1){

1990

2634

}

1991

2635

}

1992

2636

}

1993

TEMP_FAILURE_RETRY(close(pubkey_fd));

1994

}

1995

}

1996

2637

close(pubkey_fd);

2638

}

2639

}

2640

2641

if(dh_params_file != NULL

2642

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

2643

int dhparams_fd = open(dh_params_file, O_RDONLY);

2644

if(dhparams_fd == -1){

2645

perror_plus("open");

2646

} else {

2647

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

2648

if(ret == -1){

2649

perror_plus("fstat");

2650

} else {

2651

if(S_ISREG(st.st_mode)

2652

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

2653

ret = fchown(dhparams_fd, uid, gid);

2654

if(ret == -1){

2655

perror_plus("fchown");

2656

}

2657

}

2658

}

2659

close(dhparams_fd);

2660

}

2661

}

2662

1997

2663

/* Lower privileges */

1998

errno = 0;

1999

ret = seteuid(uid);

2000

if(ret == -1){

2001

perror_plus("seteuid");

2664

ret = lower_privileges();

2665

if(ret != 0){

2666

errno = ret;

2667

perror_plus("Failed to lower privileges");

2002

2668

}

2003

2669

}

2004

2670

}

2005

2671

2006

/* Remove empty interface names */

2672

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

2007

2673

{

2008

2674

char *interface = NULL;

2009

while((interface = argz_next(interfaces, interfaces_size,

2675

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

2010

2676

interface))){

2011

if(if_nametoindex(interface) == 0){

2012

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

2677

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

2678

and if_nametoindex(interface) == 0){

2679

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

2013

2680

fprintf_plus(stderr, "Not using nonexisting interface"

2014

2681

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

2015

2682

}

2016

argz_delete(&interfaces, &interfaces_size, interface);

2683

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

2017

2684

interface = NULL;

2018

2685

}

2019

2686

}

2021

2688

2022

2689

/* Run network hooks */

2023

2690

{

2024

2025

if(interfaces != NULL){

2026

interfaces_hooks = malloc(interfaces_size);

2691

if(mc.interfaces != NULL){

2692

interfaces_hooks = malloc(mc.interfaces_size);

2027

2693

if(interfaces_hooks == NULL){

2028

2694

perror_plus("malloc");

2029

2695

goto end;

2030

2696

}

2031

memcpy(interfaces_hooks, interfaces, interfaces_size);

2032

interfaces_hooks_size = interfaces_size;

2033

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2034

(int)',');

2035

}

2036

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2037

interfaces_hooks : "", delay)){

2038

goto end;

2039

}

2697

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

2698

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

2699

}

2700

run_network_hooks("start", interfaces_hooks != NULL ?

2701

interfaces_hooks : "", delay);

2040

2702

}

2041

2703

2042

2704

if(not debug){

2047

2709

from the signal handler */

2048

2710

/* Initialize the pseudo-RNG for Avahi */

2049

2711

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

2050

mc.simple_poll = avahi_simple_poll_new();

2051

if(mc.simple_poll == NULL){

2712

simple_poll = avahi_simple_poll_new();

2713

if(simple_poll == NULL){

2052

2714

fprintf_plus(stderr,

2053

2715

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

2054

2716

exitcode = EX_UNAVAILABLE;

2119

2781

}

2120

2782

2121

2783

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

2122

if(interfaces == NULL){

2123

struct dirent **direntries;

2784

if(mc.interfaces == NULL){

2785

struct dirent **direntries = NULL;

2124

2786

/* Look for any good interfaces */

2125

2787

ret = scandir(sys_class_net, &direntries, good_interface,

2126

2788

alphasort);

2127

2789

if(ret >= 1){

2128

2790

/* Add all found interfaces to interfaces list */

2129

2791

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

2130

ret_errno = argz_add(&interfaces, &interfaces_size,

2792

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

2131

2793

direntries[i]->d_name);

2132

2794

if(ret_errno != 0){

2795

errno = ret_errno;

2133

2796

perror_plus("argz_add");

2797

free(direntries[i]);

2134

2798

continue;

2135

2799

}

2136

2800

if(debug){

2137

2801

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

2138

2802

direntries[i]->d_name);

2139

2803

}

2804

free(direntries[i]);

2140

2805

}

2141

2806

free(direntries);

2142

2807

} else {

2143

free(direntries);

2808

if(ret == 0){

2809

free(direntries);

2810

}

2144

2811

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

2145

2812

exitcode = EXIT_FAILURE;

2146

2813

goto end;

2147

2814

}

2148

2815

}

2149

2816

2150

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

2151

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

2152

if(debug){

2153

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

2154

interfaces);

2155

}

2156

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2157

}

2158

2159

/* Bring up interfaces which are down */

2160

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

2161

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

2817

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

2818

{

2162

2819

char *interface = NULL;

2163

while((interface = argz_next(interfaces, interfaces_size,

2820

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

2164

2821

interface))){

2822

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

2823

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

2824

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

2825

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

2826

interface);

2827

interface = NULL;

2828

while((interface = argz_next(mc.interfaces,

2829

mc.interfaces_size, interface))){

2830

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

2831

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

2832

interface);

2833

interface = NULL;

2834

}

2835

}

2836

break;

2837

}

2165

2838

bool interface_was_up = interface_is_up(interface);

2166

ret = bring_up_interface(interface, delay);

2839

errno = bring_up_interface(interface, delay);

2167

2840

if(not interface_was_up){

2168

if(ret != 0){

2169

errno = ret;

2170

perror_plus("Failed to bring up interface");

2841

if(errno != 0){

2842

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

2843

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

2171

2844

} else {

2172

ret_errno = argz_add(&interfaces_to_take_down,

2173

&interfaces_to_take_down_size,

2174

interface);

2845

errno = argz_add(&interfaces_to_take_down,

2846

&interfaces_to_take_down_size,

2847

interface);

2848

if(errno != 0){

2849

perror_plus("argz_add");

2850

}

2175

2851

}

2176

2852

}

2177

2853

}

2178

free(interfaces);

2179

interfaces = NULL;

2180

interfaces_size = 0;

2181

2854

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

2182

2855

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

2183

2856

}

2184

2857

}

2185

2858

2859

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

2860

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

2861

if(debug){

2862

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

2863

mc.interfaces);

2864

}

2865

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

2866

}

2867

2186

2868

if(quit_now){

2187

2869

goto end;

2188

2870

}

2189

2871

2190

ret = init_gnutls_global(pubkey, seckey);

2872

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

2191

2873

if(ret == -1){

2192

2874

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

2193

2875

exitcode = EX_UNAVAILABLE;

2200

2882

goto end;

2201

2883

}

2202

2884

2203

if(mkdtemp(tempdir) == NULL){

2885

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

2886

tempdir = mkdtemp(run_tempdir);

2887

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

2888

if(debug){

2889

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

2890

run_tempdir, old_tempdir);

2891

}

2892

tempdir = mkdtemp(old_tempdir);

2893

}

2894

if(tempdir == NULL){

2204

2895

perror_plus("mkdtemp");

2205

2896

goto end;

2206

2897

}

2207

tempdir_created = true;

2208

2898

2209

2899

if(quit_now){

2210

2900

goto end;

2211

2901

}

2212

2902

2213

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

2903

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

2214

2904

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

2215

2905

exitcode = EX_UNAVAILABLE;

2216

2906

goto end;

2246

2936

exitcode = EX_USAGE;

2247

2937

goto end;

2248

2938

}

2249

2939

2250

2940

if(quit_now){

2251

2941

goto end;

2252

2942

}

2273

2963

}

2274

2964

2275

2965

while(not quit_now){

2276

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

2966

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

2967

&mc);

2277

2968

if(quit_now or ret == 0){

2278

2969

break;

2279

2970

}

2281

2972

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

2282

2973

(int)retry_interval);

2283

2974

}

2284

sleep((int)retry_interval);

2975

sleep((unsigned int)retry_interval);

2285

2976

}

2286

2977

2287

if (not quit_now){

2978

if(not quit_now){

2288

2979

exitcode = EXIT_SUCCESS;

2289

2980

}

2290

2981

2305

2996

config.publish_domain = 0;

2306

2997

2307

2998

/* Allocate a new server */

2308

mc.server = avahi_server_new(avahi_simple_poll_get

2309

(mc.simple_poll), &config, NULL,

2310

NULL, &ret_errno);

2999

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

3000

&config, NULL, NULL, &ret);

2311

3001

2312

3002

/* Free the Avahi configuration data */

2313

3003

avahi_server_config_free(&config);

2316

3006

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

2317

3007

if(mc.server == NULL){

2318

3008

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

2319

avahi_strerror(ret_errno));

3009

avahi_strerror(ret));

2320

3010

exitcode = EX_UNAVAILABLE;

2321

3011

goto end;

2322

3012

}

2328

3018

/* Create the Avahi service browser */

2329

3019

sb = avahi_s_service_browser_new(mc.server, if_index,

2330

3020

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2331

NULL, 0, browse_callback, NULL);

3021

NULL, 0, browse_callback,

3022

(void *)&mc);

2332

3023

if(sb == NULL){

2333

3024

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

2334

3025

avahi_strerror(avahi_server_errno(mc.server)));

2345

3036

if(debug){

2346

3037

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

2347

3038

}

2348

2349

ret = avahi_loop_with_timeout(mc.simple_poll,

2350

(int)(retry_interval * 1000));

3039

3040

ret = avahi_loop_with_timeout(simple_poll,

3041

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

2351

3042

if(debug){

2352

3043

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

2353

3044

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

2356

3047

end:

2357

3048

2358

3049

if(debug){

2359

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

3050

if(signal_received){

3051

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

3052

argv[0], signal_received,

3053

strsignal(signal_received));

3054

} else {

3055

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

3056

}

2360

3057

}

2361

3058

2362

3059

/* Cleanup things */

3060

free(mc.interfaces);

3061

2363

3062

if(sb != NULL)

2364

3063

avahi_s_service_browser_free(sb);

2365

3064

2366

3065

if(mc.server != NULL)

2367

3066

avahi_server_free(mc.server);

2368

3067

2369

if(mc.simple_poll != NULL)

2370

avahi_simple_poll_free(mc.simple_poll);

3068

if(simple_poll != NULL)

3069

avahi_simple_poll_free(simple_poll);

2371

3070

2372

3071

if(gnutls_initialized){

2373

3072

gnutls_certificate_free_credentials(mc.cred);

2374

gnutls_global_deinit();

2375

3073

gnutls_dh_params_deinit(mc.dh_params);

2376

3074

}

2377

3075

2385

3083

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

2386

3084

while(mc.current_server != NULL){

2387

3085

server *next = mc.current_server->next;

3086

#ifdef __GNUC__

3087

#pragma GCC diagnostic push

3088

#pragma GCC diagnostic ignored "-Wcast-qual"

3089

#endif

3090

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

3091

#ifdef __GNUC__

3092

#pragma GCC diagnostic pop

3093

#endif

2388

3094

free(mc.current_server);

2389

3095

mc.current_server = next;

2390

3096

}

2391

3097

}

2392

3098

2393

/* Re-raise priviliges */

3099

/* Re-raise privileges */

2394

3100

{

2395

raise_privileges();

2396

2397

/* Run network hooks */

2398

run_network_hooks("stop", interfaces_hooks != NULL ?

2399

interfaces_hooks : "", delay);

2400

2401

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

2402

{

2403

char *interface = NULL;

2404

while((interface=argz_next(interfaces_to_take_down,

2405

interfaces_to_take_down_size,

2406

interface))){

2407

ret_errno = take_down_interface(interface);

2408

if(ret_errno != 0){

2409

errno = ret_errno;

2410

perror_plus("Failed to take down interface");

2411

}

2412

}

2413

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

2414

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

2415

" down\n");

2416

}

2417

}

2418

2419

lower_privileges_permanently();

3101

ret = raise_privileges();

3102

if(ret != 0){

3103

errno = ret;

3104

perror_plus("Failed to raise privileges");

3105

} else {

3106

3107

/* Run network hooks */

3108

run_network_hooks("stop", interfaces_hooks != NULL ?

3109

interfaces_hooks : "", delay);

3110

3111

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

3112

{

3113

char *interface = NULL;

3114

while((interface = argz_next(interfaces_to_take_down,

3115

interfaces_to_take_down_size,

3116

interface))){

3117

ret = take_down_interface(interface);

3118

if(ret != 0){

3119

errno = ret;

3120

perror_plus("Failed to take down interface");

3121

}

3122

}

3123

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

3124

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

3125

" down\n");

3126

}

3127

}

3128

}

3129

3130

ret = lower_privileges_permanently();

3131

if(ret != 0){

3132

errno = ret;

3133

perror_plus("Failed to lower privileges permanently");

3134

}

2420

3135

}

2421

3136

2422

3137

free(interfaces_to_take_down);

2423

3138

free(interfaces_hooks);

2424

3139

3140

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

3141

uintmax_t level){

3142

struct dirent **direntries = NULL;

3143

int dret;

3144

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

3145

O_RDONLY

3146

| O_NOFOLLOW

3147

| O_DIRECTORY

3148

| O_PATH));

3149

if(dir_fd == -1){

3150

perror_plus("open");

3151

return;

3152

}

3153

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

3154

notdotentries, alphasort);

3155

if(numentries >= 0){

3156

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

3157

if(debug){

3158

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

3159

dirname, direntries[i]->d_name);

3160

}

3161

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

3162

if(dret == -1){

3163

if(errno == EISDIR){

3164

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

3165

AT_REMOVEDIR);

3166

}

3167

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

3168

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

3169

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

3170

/* Recurse only in this special case */

3171

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

3172

dret = 0;

3173

}

3174

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

3175

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

3176

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

3177

}

3178

}

3179

free(direntries[i]);

3180

}

3181

3182

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

3183

free(direntries);

3184

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3185

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

3186

perror_plus("rmdir");

3187

}

3188

} else {

3189

perror_plus("scandirat");

3190

}

3191

close(dir_fd);

3192

}

3193

2425

3194

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

2426

if(tempdir_created){

2427

struct dirent **direntries = NULL;

2428

struct dirent *direntry = NULL;

2429

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

2430

alphasort);

2431

if (numentries > 0){

2432

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

2433

direntry = direntries[i];

2434

char *fullname = NULL;

2435

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

2436

direntry->d_name);

2437

if(ret < 0){

2438

perror_plus("asprintf");

2439

continue;

2440

}

2441

ret = remove(fullname);

2442

if(ret == -1){

2443

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

2444

strerror(errno));

2445

}

2446

free(fullname);

2447

}

2448

}

2449

2450

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

2451

free(direntries);

2452

if (numentries == -1){

2453

perror_plus("scandir");

2454

}

2455

ret = rmdir(tempdir);

2456

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

2457

perror_plus("rmdir");

2458

}

3195

if(tempdir != NULL){

3196

clean_dir_at(-1, tempdir, 0);

2459

3197

}

2460

3198

2461

3199

if(quit_now){