/mandos/trunk : revision 1230

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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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#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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#include <sys/socket.h> /* socket(), struct sockaddr_in6,

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inet_pton(), connect(),

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getnameinfo() */

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

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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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*/

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

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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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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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gnutls_*

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init_gnutls_session(),

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GNUTLS_* */

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#if GNUTLS_VERSION_NUMBER < 0x030600

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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#elif GNUTLS_VERSION_NUMBER >= 0x030606

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#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,

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GNUTLS_PKCS_PLAIN,

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GNUTLS_PKCS_NULL_PASSWORD */

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#endif

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/* GPGME */

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

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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#define TLS_PRIVKEY "tls-privkey.pem"

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#define TLS_PUBKEY "tls-pubkey.pem"

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

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bool debug = false;

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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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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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* 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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*/

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__attribute__((nonnull, warn_unused_result))

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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}

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

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__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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int ret;

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.af = af };

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if(new_server->ip == NULL){

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perror_plus("strdup");

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free(new_server);

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return false;

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}

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

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if(ret == -1){

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perror_plus("clock_gettime");

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#ifdef __GNUC__

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#pragma GCC diagnostic push

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#pragma GCC diagnostic ignored "-Wcast-qual"

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#endif

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

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#ifdef __GNUC__

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#pragma GCC diagnostic pop

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#endif

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free(new_server);

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return false;

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}

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/* Special case of first server */

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new_server->next = new_server;

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new_server->prev = new_server;

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*current_server = new_server;

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

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} else {

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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return true;

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}

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

284

__attribute__((warn_unused_result))

285

int raise_privileges(void){

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int old_errno = errno;

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int ret = 0;

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

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ret = errno;

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}

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errno = old_errno;

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return ret;

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}

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

296

__attribute__((warn_unused_result))

297

int raise_privileges_permanently(void){

298

int old_errno = errno;

299

int ret = raise_privileges();

300

if(ret != 0){

301

errno = old_errno;

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return ret;

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}

304

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

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ret = errno;

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}

307

errno = old_errno;

308

return ret;

309

}

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

312

__attribute__((warn_unused_result))

313

int lower_privileges(void){

314

int old_errno = errno;

315

int ret = 0;

316

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

317

ret = errno;

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}

319

errno = old_errno;

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return ret;

321

}

322

323

/* Lower privileges permanently */

324

__attribute__((warn_unused_result))

325

int lower_privileges_permanently(void){

326

int old_errno = errno;

327

int ret = 0;

328

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

329

ret = errno;

330

}

331

errno = old_errno;

332

return ret;

333

}

334

255

335

/*

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336

* Initialize GPGME.

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337

*/

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

259

const char *tempdir, mandos_context *mc){

338

__attribute__((nonnull, warn_unused_result))

339

static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

342

mandos_context *mc){

260

343

gpgme_error_t rc;

261

344

gpgme_engine_info_t engine_info;

262

345

263

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/*

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

265

348

*/

266

bool import_key(const char *filename){

349

bool import_key(const char * const filename){

267

350

int ret;

268

351

int fd;

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352

gpgme_data_t pgp_data;

274

357

return false;

275

358

}

276

359

360

/* Workaround for systems without a real-time clock; see also

361

Debian bug #894495: <https://bugs.debian.org/894495> */

362

do {

363

{

364

time_t currtime = time(NULL);

365

if(currtime != (time_t)-1){

366

struct tm tm;

367

if(gmtime_r(&currtime, &tm) == NULL) {

368

perror_plus("gmtime_r");

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break;

370

}

371

if(tm.tm_year != 70 or tm.tm_mon != 0){

372

break;

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}

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if(debug){

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fprintf_plus(stderr, "System clock is January 1970");

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}

377

} else {

378

if(debug){

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fprintf_plus(stderr, "System clock is invalid");

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}

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}

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}

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struct stat keystat;

384

ret = fstat(fd, &keystat);

385

if(ret != 0){

386

perror_plus("fstat");

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break;

388

}

389

ret = raise_privileges();

390

if(ret != 0){

391

errno = ret;

392

perror_plus("Failed to raise privileges");

393

break;

394

}

395

if(debug){

396

fprintf_plus(stderr,

397

"Setting system clock to key file mtime");

398

}

399

if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){

400

perror_plus("clock_settime");

401

}

402

ret = lower_privileges();

403

if(ret != 0){

404

errno = ret;

405

perror_plus("Failed to lower privileges");

406

}

407

} while(false);

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

278

410

if(rc != GPG_ERR_NO_ERROR){

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

287

419

gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

289

421

}

422

{

423

gpgme_import_result_t import_result

424

= gpgme_op_import_result(mc->ctx);

425

if((import_result->imported < 1

426

or import_result->not_imported > 0)

427

and import_result->unchanged == 0){

428

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

429

fprintf_plus(stderr,

430

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

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import_result->considered);

432

fprintf_plus(stderr,

433

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

434

import_result->no_user_id);

435

fprintf_plus(stderr,

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

437

import_result->imported);

438

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

439

import_result->imported_rsa);

440

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

441

import_result->unchanged);

442

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

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import_result->new_user_ids);

444

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

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import_result->new_sub_keys);

446

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

447

import_result->new_signatures);

448

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

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import_result->new_revocations);

450

fprintf_plus(stderr,

451

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

452

import_result->secret_read);

453

fprintf_plus(stderr,

454

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

455

import_result->secret_imported);

456

fprintf_plus(stderr,

457

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

458

import_result->secret_unchanged);

459

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

460

import_result->not_imported);

461

for(gpgme_import_status_t import_status

462

= import_result->imports;

463

import_status != NULL;

464

import_status = import_status->next){

465

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

466

import_status->fpr);

467

if(import_status->result != GPG_ERR_NO_ERROR){

468

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

469

gpgme_strsource(import_status->result),

470

gpgme_strerror(import_status->result));

471

}

472

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

473

fprintf_plus(stderr,

474

import_status->status & GPGME_IMPORT_NEW

475

? "The key was new.\n"

476

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

477

fprintf_plus(stderr,

478

import_status->status & GPGME_IMPORT_UID

479

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

480

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

481

fprintf_plus(stderr,

482

import_status->status & GPGME_IMPORT_SIG

483

? "The key contained new signatures.\n"

484

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

485

fprintf_plus(stderr,

486

import_status->status & GPGME_IMPORT_SUBKEY

487

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

488

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

489

fprintf_plus(stderr,

490

import_status->status & GPGME_IMPORT_SECRET

491

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

492

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

493

}

494

return false;

495

}

496

}

290

497

291

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

498

ret = close(fd);

292

499

if(ret == -1){

293

500

perror_plus("close");

294

501

}

333

540

/* Create new GPGME "context" */

334

541

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

335

542

if(rc != GPG_ERR_NO_ERROR){

336

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

337

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

338

gpgme_strerror(rc));

543

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

544

gpgme_strsource(rc), gpgme_strerror(rc));

339

545

return false;

340

546

}

341

547

350

556

* Decrypt OpenPGP data.

351

557

* Returns -1 on error

352

558

*/

559

__attribute__((nonnull, warn_unused_result))

353

560

static ssize_t pgp_packet_decrypt(const char *cryptotext,

354

561

size_t crypto_size,

355

562

char **plaintext,

376

583

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

377

584

rc = gpgme_data_new(&dh_plain);

378

585

if(rc != GPG_ERR_NO_ERROR){

379

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

380

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

586

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

381

587

gpgme_strsource(rc), gpgme_strerror(rc));

382

588

gpgme_data_release(dh_crypto);

383

589

return -1;

396

602

if(result == NULL){

397

603

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

398

604

} else {

399

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

400

result->unsupported_algorithm);

401

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

402

result->wrong_key_usage);

605

if(result->unsupported_algorithm != NULL) {

606

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

607

result->unsupported_algorithm);

608

}

609

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

610

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

403

611

if(result->file_name != NULL){

404

612

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

405

613

}

406

gpgme_recipient_t recipient;

407

recipient = result->recipients;

408

while(recipient != NULL){

614

615

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

616

r = r->next){

409

617

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

410

gpgme_pubkey_algo_name

411

(recipient->pubkey_algo));

412

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

618

gpgme_pubkey_algo_name(r->pubkey_algo));

619

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

413

620

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

414

recipient->status == GPG_ERR_NO_SECKEY

415

? "No" : "Yes");

416

recipient = recipient->next;

621

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

417

622

}

418

623

}

419

624

}

475

680

return plaintext_length;

476

681

}

477

682

478

static const char * safer_gnutls_strerror(int value){

683

__attribute__((warn_unused_result, const))

684

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

685

if(str == NULL)

686

return "(unknown)";

687

return str;

688

}

689

690

__attribute__((warn_unused_result))

691

static const char *safer_gnutls_strerror(int value){

479

692

const char *ret = gnutls_strerror(value);

480

if(ret == NULL)

481

ret = "(unknown)";

482

return ret;

693

return safe_string(ret);

483

694

}

484

695

485

696

/* GnuTLS log function callback */

697

__attribute__((nonnull))

486

698

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

487

699

const char* string){

488

700

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

489

701

}

490

702

703

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

491

704

static int init_gnutls_global(const char *pubkeyfilename,

492

705

const char *seckeyfilename,

706

const char *dhparamsfilename,

493

707

mandos_context *mc){

494

708

int ret;

495

709

497

711

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

498

712

}

499

713

500

ret = gnutls_global_init();

501

if(ret != GNUTLS_E_SUCCESS){

502

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

503

safer_gnutls_strerror(ret));

504

return -1;

505

}

506

507

714

if(debug){

508

715

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

509

716

* - GnuTLS manual

517

724

if(ret != GNUTLS_E_SUCCESS){

518

725

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

519

726

safer_gnutls_strerror(ret));

520

gnutls_global_deinit();

521

727

return -1;

522

728

}

523

729

524

730

if(debug){

525

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

526

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

731

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

732

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

527

733

pubkeyfilename,

528

734

seckeyfilename);

529

735

}

530

736

737

#if GNUTLS_VERSION_NUMBER >= 0x030606

738

ret = gnutls_certificate_set_rawpk_key_file

739

(mc->cred, pubkeyfilename, seckeyfilename,

740

GNUTLS_X509_FMT_PEM, /* format */

741

NULL, /* pass */

742

/* key_usage */

743

GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,

744

NULL, /* names */

745

0, /* names_length */

746

/* privkey_flags */

747

GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,

748

0); /* pkcs11_flags */

749

#elif GNUTLS_VERSION_NUMBER < 0x030600

531

750

ret = gnutls_certificate_set_openpgp_key_file

532

751

(mc->cred, pubkeyfilename, seckeyfilename,

533

752

GNUTLS_OPENPGP_FMT_BASE64);

753

#else

754

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

755

#endif

534

756

if(ret != GNUTLS_E_SUCCESS){

535

757

fprintf_plus(stderr,

536

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

758

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

537

759

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

538

760

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

539

761

safer_gnutls_strerror(ret));

548

770

safer_gnutls_strerror(ret));

549

771

goto globalfail;

550

772

}

551

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

552

if(ret != GNUTLS_E_SUCCESS){

553

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

554

safer_gnutls_strerror(ret));

555

goto globalfail;

556

}

557

558

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

773

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

774

if(dhparamsfilename != NULL){

775

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

776

do {

777

int dhpfile = open(dhparamsfilename, O_RDONLY);

778

if(dhpfile == -1){

779

perror_plus("open");

780

dhparamsfilename = NULL;

781

break;

782

}

783

size_t params_capacity = 0;

784

while(true){

785

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

786

(size_t)params.size,

787

(size_t)params_capacity);

788

if(params_capacity == 0){

789

perror_plus("incbuffer");

790

free(params.data);

791

params.data = NULL;

792

dhparamsfilename = NULL;

793

break;

794

}

795

ssize_t bytes_read = read(dhpfile,

796

params.data + params.size,

797

BUFFER_SIZE);

798

/* EOF */

799

if(bytes_read == 0){

800

break;

801

}

802

/* check bytes_read for failure */

803

if(bytes_read < 0){

804

perror_plus("read");

805

free(params.data);

806

params.data = NULL;

807

dhparamsfilename = NULL;

808

break;

809

}

810

params.size += (unsigned int)bytes_read;

811

}

812

ret = close(dhpfile);

813

if(ret == -1){

814

perror_plus("close");

815

}

816

if(params.data == NULL){

817

dhparamsfilename = NULL;

818

}

819

if(dhparamsfilename == NULL){

820

break;

821

}

822

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

823

GNUTLS_X509_FMT_PEM);

824

if(ret != GNUTLS_E_SUCCESS){

825

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

826

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

827

safer_gnutls_strerror(ret));

828

dhparamsfilename = NULL;

829

}

830

free(params.data);

831

} while(false);

832

}

833

if(dhparamsfilename == NULL){

834

if(mc->dh_bits == 0){

835

#if GNUTLS_VERSION_NUMBER < 0x030600

836

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

837

/* Try to read the private key file */

838

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

839

do {

840

int secfile = open(seckeyfilename, O_RDONLY);

841

if(secfile == -1){

842

perror_plus("open");

843

break;

844

}

845

size_t buffer_capacity = 0;

846

while(true){

847

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

848

(size_t)buffer.size,

849

(size_t)buffer_capacity);

850

if(buffer_capacity == 0){

851

perror_plus("incbuffer");

852

free(buffer.data);

853

buffer.data = NULL;

854

break;

855

}

856

ssize_t bytes_read = read(secfile,

857

buffer.data + buffer.size,

858

BUFFER_SIZE);

859

/* EOF */

860

if(bytes_read == 0){

861

break;

862

}

863

/* check bytes_read for failure */

864

if(bytes_read < 0){

865

perror_plus("read");

866

free(buffer.data);

867

buffer.data = NULL;

868

break;

869

}

870

buffer.size += (unsigned int)bytes_read;

871

}

872

close(secfile);

873

} while(false);

874

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

875

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

876

if(buffer.data != NULL){

877

{

878

gnutls_openpgp_privkey_t privkey = NULL;

879

ret = gnutls_openpgp_privkey_init(&privkey);

880

if(ret != GNUTLS_E_SUCCESS){

881

fprintf_plus(stderr, "Error initializing OpenPGP key"

882

" structure: %s",

883

safer_gnutls_strerror(ret));

884

free(buffer.data);

885

buffer.data = NULL;

886

} else {

887

ret = gnutls_openpgp_privkey_import

888

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

889

if(ret != GNUTLS_E_SUCCESS){

890

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

891

safer_gnutls_strerror(ret));

892

privkey = NULL;

893

}

894

free(buffer.data);

895

buffer.data = NULL;

896

if(privkey != NULL){

897

/* Use private key to suggest an appropriate

898

sec_param */

899

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

900

gnutls_openpgp_privkey_deinit(privkey);

901

if(debug){

902

fprintf_plus(stderr, "This OpenPGP key implies using"

903

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

904

safe_string(gnutls_sec_param_get_name

905

(sec_param)));

906

}

907

}

908

}

909

}

910

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

911

/* Err on the side of caution */

912

sec_param = GNUTLS_SEC_PARAM_ULTRA;

913

if(debug){

914

fprintf_plus(stderr, "Falling back to security parameter"

915

" \"%s\"\n",

916

safe_string(gnutls_sec_param_get_name

917

(sec_param)));

918

}

919

}

920

}

921

unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

922

if(uret != 0){

923

mc->dh_bits = uret;

924

if(debug){

925

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

926

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

927

safe_string(gnutls_sec_param_get_name

928

(sec_param)),

929

mc->dh_bits);

930

}

931

} else {

932

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

933

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

934

safe_string(gnutls_sec_param_get_name

935

(sec_param)),

936

safer_gnutls_strerror(ret));

937

goto globalfail;

938

}

939

#endif

940

} else { /* dh_bits != 0 */

941

if(debug){

942

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

943

mc->dh_bits);

944

}

945

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

946

if(ret != GNUTLS_E_SUCCESS){

947

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

948

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

949

safer_gnutls_strerror(ret));

950

goto globalfail;

951

}

952

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

953

}

954

}

559

955

560

956

return 0;

561

957

562

958

globalfail:

563

959

564

960

gnutls_certificate_free_credentials(mc->cred);

565

gnutls_global_deinit();

566

961

gnutls_dh_params_deinit(mc->dh_params);

567

962

return -1;

568

963

}

569

964

965

__attribute__((nonnull, warn_unused_result))

570

966

static int init_gnutls_session(gnutls_session_t *session,

571

967

mandos_context *mc){

572

968

int ret;

573

969

/* GnuTLS session creation */

574

970

do {

575

ret = gnutls_init(session, GNUTLS_SERVER);

971

ret = gnutls_init(session, (GNUTLS_SERVER

972

#if GNUTLS_VERSION_NUMBER >= 0x030506

973

| GNUTLS_NO_TICKETS

974

#endif

975

#if GNUTLS_VERSION_NUMBER >= 0x030606

976

| GNUTLS_ENABLE_RAWPK

977

#endif

978

));

576

979

if(quit_now){

577

980

return -1;

578

981

}

619

1022

/* ignore client certificate if any. */

620

1023

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

621

1024

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

623

624

1025

return 0;

625

1026

}

626

1027

628

1029

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

629

1030

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

630

1031

1032

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

1033

__attribute__((nonnull, warn_unused_result))

1034

static bool add_delete_local_route(const bool add,

1035

const char *address,

1036

AvahiIfIndex if_index){

1037

int ret;

1038

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

1039

char add_arg[] = "add";

1040

char delete_arg[] = "delete";

1041

char debug_flag[] = "--debug";

1042

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

1043

if(pluginhelperdir == NULL){

1044

if(debug){

1045

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

1046

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

1047

}

1048

return false;

1049

}

1050

1051

char interface[IF_NAMESIZE];

1052

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

1053

perror_plus("if_indextoname");

1054

return false;

1055

}

1056

1057

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

1058

if(devnull == -1){

1059

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

1060

return false;

1061

}

1062

pid_t pid = fork();

1063

if(pid == 0){

1064

/* Child */

1065

/* Raise privileges */

1066

errno = raise_privileges_permanently();

1067

if(errno != 0){

1068

perror_plus("Failed to raise privileges");

1069

/* _exit(EX_NOPERM); */

1070

} else {

1071

/* Set group */

1072

errno = 0;

1073

ret = setgid(0);

1074

if(ret == -1){

1075

perror_plus("setgid");

1076

close(devnull);

1077

_exit(EX_NOPERM);

1078

}

1079

/* Reset supplementary groups */

1080

errno = 0;

1081

ret = setgroups(0, NULL);

1082

if(ret == -1){

1083

perror_plus("setgroups");

1084

close(devnull);

1085

_exit(EX_NOPERM);

1086

}

1087

}

1088

ret = dup2(devnull, STDIN_FILENO);

1089

if(ret == -1){

1090

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

1091

close(devnull);

1092

_exit(EX_OSERR);

1093

}

1094

ret = close(devnull);

1095

if(ret == -1){

1096

perror_plus("close");

1097

}

1098

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1099

if(ret == -1){

1100

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

1101

_exit(EX_OSERR);

1102

}

1103

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

1104

O_RDONLY

1105

| O_DIRECTORY

1106

| O_PATH

1107

| O_CLOEXEC));

1108

if(helperdir_fd == -1){

1109

perror_plus("open");

1110

_exit(EX_UNAVAILABLE);

1111

}

1112

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

1113

helper, O_RDONLY));

1114

if(helper_fd == -1){

1115

perror_plus("openat");

1116

close(helperdir_fd);

1117

_exit(EX_UNAVAILABLE);

1118

}

1119

close(helperdir_fd);

1120

#ifdef __GNUC__

1121

#pragma GCC diagnostic push

1122

#pragma GCC diagnostic ignored "-Wcast-qual"

1123

#endif

1124

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

1125

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

1126

interface, debug ? debug_flag : NULL, NULL },

1127

environ) == -1){

1128

#ifdef __GNUC__

1129

#pragma GCC diagnostic pop

1130

#endif

1131

perror_plus("fexecve");

1132

_exit(EXIT_FAILURE);

1133

}

1134

}

1135

if(pid == -1){

1136

perror_plus("fork");

1137

close(devnull);

1138

return false;

1139

}

1140

ret = close(devnull);

1141

if(ret == -1){

1142

perror_plus("close");

1143

}

1144

int status;

1145

pid_t pret = -1;

1146

errno = 0;

1147

do {

1148

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

1149

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

1150

int errno_raising = 0;

1151

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

1152

errno_raising = errno;

1153

perror_plus("Failed to raise privileges in order to"

1154

" kill helper program");

1155

}

1156

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

1157

perror_plus("kill");

1158

}

1159

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

1160

perror_plus("Failed to lower privileges after killing"

1161

" helper program");

1162

}

1163

return false;

1164

}

1165

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

1166

if(pret == -1){

1167

perror_plus("waitpid");

1168

return false;

1169

}

1170

if(WIFEXITED(status)){

1171

if(WEXITSTATUS(status) != 0){

1172

fprintf_plus(stderr, "Error: iprouteadddel exited"

1173

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

1174

return false;

1175

}

1176

return true;

1177

}

1178

if(WIFSIGNALED(status)){

1179

fprintf_plus(stderr, "Error: iprouteadddel died by"

1180

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

1181

return false;

1182

}

1183

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

1184

return false;

1185

}

1186

1187

__attribute__((nonnull, warn_unused_result))

1188

static bool add_local_route(const char *address,

1189

AvahiIfIndex if_index){

1190

if(debug){

1191

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

1192

}

1193

return add_delete_local_route(true, address, if_index);

1194

}

1195

1196

__attribute__((nonnull, warn_unused_result))

1197

static bool delete_local_route(const char *address,

1198

AvahiIfIndex if_index){

1199

if(debug){

1200

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

1201

}

1202

return add_delete_local_route(false, address, if_index);

1203

}

1204

631

1205

/* Called when a Mandos server is found */

1206

__attribute__((nonnull, warn_unused_result))

632

1207

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

633

1208

AvahiIfIndex if_index,

634

1209

int af, mandos_context *mc){

643

1218

int retval = -1;

644

1219

gnutls_session_t session;

645

1220

int pf; /* Protocol family */

1221

bool route_added = false;

646

1222

647

1223

errno = 0;

648

1224

670

1246

bool match = false;

671

1247

{

672

1248

char *interface = NULL;

673

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

674

interface))){

1249

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

1250

mc->interfaces_size,

1251

interface))){

675

1252

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

676

1253

match = true;

677

1254

break;

706

1283

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

707

1284

}

708

1285

709

tcp_sd = socket(pf, SOCK_STREAM, 0);

1286

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

710

1287

if(tcp_sd < 0){

711

1288

int e = errno;

712

1289

perror_plus("socket");

719

1296

goto mandos_end;

720

1297

}

721

1298

722

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

723

1299

if(af == AF_INET6){

724

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

725

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

1300

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

1301

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

1302

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

726

1303

} else { /* IPv4 */

727

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

728

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

1304

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

1305

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

1306

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

729

1307

}

730

1308

if(ret < 0 ){

731

1309

int e = errno;

740

1318

goto mandos_end;

741

1319

}

742

1320

if(af == AF_INET6){

743

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

1321

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

744

1322

if(IN6_IS_ADDR_LINKLOCAL

745

1323

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

746

1324

if(if_index == AVAHI_IF_UNSPEC){

801

1379

goto mandos_end;

802

1380

}

803

1381

804

if(af == AF_INET6){

805

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

806

sizeof(struct sockaddr_in6));

807

} else {

808

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

809

sizeof(struct sockaddr_in));

810

}

811

if(ret < 0){

812

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

813

int e = errno;

814

perror_plus("connect");

815

errno = e;

816

}

817

goto mandos_end;

818

}

819

820

if(quit_now){

821

errno = EINTR;

822

goto mandos_end;

1382

while(true){

1383

if(af == AF_INET6){

1384

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

1385

sizeof(struct sockaddr_in6));

1386

} else {

1387

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

1388

sizeof(struct sockaddr_in));

1389

}

1390

if(ret < 0){

1391

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

1392

and if_index != AVAHI_IF_UNSPEC

1393

and connect_to == NULL

1394

and not route_added and

1395

((af == AF_INET6 and not

1396

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1397

&to)->sin6_addr)))

1398

or (af == AF_INET and

1399

/* Not a a IPv4LL address */

1400

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

1401

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

1402

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

1403

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

1404

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

1405

connect to a Mandos server announced by Avahi on a server

1406

host with a global address. Work around this by retrying

1407

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

1408

1409

Avahi bug reference:

1410

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

1411

https://bugs.debian.org/587961

1412

*/

1413

if(debug){

1414

fprintf_plus(stderr, "Mandos server unreachable, trying"

1415

" direct route\n");

1416

}

1417

int e = errno;

1418

route_added = add_local_route(ip, if_index);

1419

if(route_added){

1420

continue;

1421

}

1422

errno = e;

1423

}

1424

if(errno != ECONNREFUSED or debug){

1425

int e = errno;

1426

perror_plus("connect");

1427

errno = e;

1428

}

1429

goto mandos_end;

1430

}

1431

1432

if(quit_now){

1433

errno = EINTR;

1434

goto mandos_end;

1435

}

1436

break;

823

1437

}

824

1438

825

1439

const char *out = mandos_protocol_version;

979

1593

&decrypted_buffer, mc);

980

1594

if(decrypted_buffer_size >= 0){

981

1595

1596

clearerr(stdout);

982

1597

written = 0;

983

1598

while(written < (size_t) decrypted_buffer_size){

984

1599

if(quit_now){

1000

1615

}

1001

1616

written += (size_t)ret;

1002

1617

}

1618

ret = fflush(stdout);

1619

if(ret != 0){

1620

int e = errno;

1621

if(debug){

1622

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

1623

strerror(errno));

1624

}

1625

errno = e;

1626

goto mandos_end;

1627

}

1003

1628

retval = 0;

1004

1629

}

1005

1630

}

1008

1633

1009

1634

mandos_end:

1010

1635

{

1636

if(route_added){

1637

if(not delete_local_route(ip, if_index)){

1638

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

1639

" interface %d", ip, if_index);

1640

}

1641

}

1011

1642

int e = errno;

1012

1643

free(decrypted_buffer);

1013

1644

free(buffer);

1014

1645

if(tcp_sd >= 0){

1015

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

1646

ret = close(tcp_sd);

1016

1647

}

1017

1648

if(ret == -1){

1018

1649

if(e == 0){

1043

1674

AVAHI_GCC_UNUSED AvahiStringList *txt,

1044

1675

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1045

1676

flags,

1046

void* mc){

1677

void *mc){

1047

1678

if(r == NULL){

1048

1679

return;

1049

1680

}

1052

1683

timed out */

1053

1684

1054

1685

if(quit_now){

1686

avahi_s_service_resolver_free(r);

1055

1687

return;

1056

1688

}

1057

1689

1102

1734

const char *domain,

1103

1735

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1104

1736

flags,

1105

void* mc){

1737

void *mc){

1106

1738

if(b == NULL){

1107

1739

return;

1108

1740

}

1168

1800

errno = old_errno;

1169

1801

}

1170

1802

1803

__attribute__((nonnull, warn_unused_result))

1171

1804

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

1172

1805

int ret;

1173

error_t ret_errno;

1806

int old_errno;

1174

1807

1175

1808

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

1176

1809

if(s < 0){

1177

ret_errno = errno;

1810

old_errno = errno;

1178

1811

perror_plus("socket");

1179

errno = ret_errno;

1812

errno = old_errno;

1180

1813

return false;

1181

1814

}

1182

strcpy(ifr->ifr_name, ifname);

1815

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

1816

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

1183

1817

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1184

1818

if(ret == -1){

1185

1819

if(debug){

1186

ret_errno = errno;

1820

old_errno = errno;

1187

1821

perror_plus("ioctl SIOCGIFFLAGS");

1188

errno = ret_errno;

1822

errno = old_errno;

1823

}

1824

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

1825

old_errno = errno;

1826

perror_plus("close");

1827

errno = old_errno;

1189

1828

}

1190

1829

return false;

1191

1830

}

1831

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

1832

old_errno = errno;

1833

perror_plus("close");

1834

errno = old_errno;

1835

}

1192

1836

return true;

1193

1837

}

1194

1838

1839

__attribute__((nonnull, warn_unused_result))

1195

1840

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

1196

1841

1197

1842

/* Reject the loopback device */

1239

1884

* corresponds to an acceptable network device.

1240

1885

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

1241

1886

*/

1887

__attribute__((nonnull, warn_unused_result))

1242

1888

int good_interface(const struct dirent *if_entry){

1243

1889

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

1244

1890

return 0;

1262

1908

/*

1263

1909

* This function determines if a network interface is up.

1264

1910

*/

1911

__attribute__((nonnull, warn_unused_result))

1265

1912

bool interface_is_up(const char *interface){

1266

1913

struct ifreq ifr;

1267

1914

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

1278

1925

/*

1279

1926

* This function determines if a network interface is running

1280

1927

*/

1928

__attribute__((nonnull, warn_unused_result))

1281

1929

bool interface_is_running(const char *interface){

1282

1930

struct ifreq ifr;

1283

1931

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

1291

1939

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

1292

1940

}

1293

1941

1942

__attribute__((nonnull, pure, warn_unused_result))

1294

1943

int notdotentries(const struct dirent *direntry){

1295

1944

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

1296

1945

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

1303

1952

}

1304

1953

1305

1954

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

1955

__attribute__((nonnull, warn_unused_result))

1306

1956

int runnable_hook(const struct dirent *direntry){

1307

1957

int ret;

1308

1958

size_t sret;

1316

1966

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

1317

1967

"abcdefghijklmnopqrstuvwxyz"

1318

1968

"0123456789"

1319

"_-");

1969

"_.-");

1320

1970

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

1321

1971

/* Contains non-allowed characters */

1322

1972

if(debug){

1326

1976

return 0;

1327

1977

}

1328

1978

1329

char *fullname = NULL;

1330

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

1331

if(ret < 0){

1332

perror_plus("asprintf");

1333

return 0;

1334

}

1335

1336

ret = stat(fullname, &st);

1979

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

1337

1980

if(ret == -1){

1338

1981

if(debug){

1339

1982

perror_plus("Could not stat hook");

1363

2006

return 1;

1364

2007

}

1365

2008

2009

__attribute__((nonnull, warn_unused_result))

1366

2010

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1367

2011

mandos_context *mc){

1368

2012

int ret;

1372

2016

1373

2017

while(true){

1374

2018

if(mc->current_server == NULL){

1375

if (debug){

2019

if(debug){

1376

2020

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

1377

2021

" No timeout!\n");

1378

2022

}

1379

2023

ret = avahi_simple_poll_iterate(s, -1);

1380

2024

} else {

1381

if (debug){

2025

if(debug){

1382

2026

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

1383

2027

" it, or wait\n");

1384

2028

}

1401

2045

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

1402

2046

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

1403

2047

1404

if (debug){

2048

if(debug){

1405

2049

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

1406

2050

block_time);

1407

2051

}

1429

2073

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

1430

2074

}

1431

2075

if(ret != 0){

1432

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

2076

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

1433

2077

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

1434

2078

}

1435

2079

}

1436

2080

}

1437

2081

}

1438

2082

1439

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

1440

error_t raise_privileges(void){

1441

error_t old_errno = errno;

1442

error_t ret_errno = 0;

1443

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

1444

ret_errno = errno;

1445

perror_plus("seteuid");

1446

}

1447

errno = old_errno;

1448

return ret_errno;

1449

}

1450

1451

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

1452

error_t raise_privileges_permanently(void){

1453

error_t old_errno = errno;

1454

error_t ret_errno = raise_privileges();

1455

if(ret_errno != 0){

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

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

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

error_t lower_privileges(void){

1469

error_t old_errno = errno;

1470

error_t ret_errno = 0;

1471

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

1472

ret_errno = errno;

1473

perror_plus("seteuid");

1474

}

1475

errno = old_errno;

1476

return ret_errno;

1477

}

1478

1479

/* Lower privileges permanently */

1480

error_t lower_privileges_permanently(void){

1481

error_t old_errno = errno;

1482

error_t ret_errno = 0;

1483

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

1484

ret_errno = errno;

1485

perror_plus("setuid");

1486

}

1487

errno = old_errno;

1488

return ret_errno;

1489

}

1490

1491

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

2083

__attribute__((nonnull))

2084

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

1492

2085

const float delay){

1493

struct dirent **direntries;

1494

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

1495

alphasort);

2086

struct dirent **direntries = NULL;

2087

if(hookdir_fd == -1){

2088

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

2089

| O_CLOEXEC);

2090

if(hookdir_fd == -1){

2091

if(errno == ENOENT){

2092

if(debug){

2093

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

2094

" found\n", hookdir);

2095

}

2096

} else {

2097

perror_plus("open");

2098

}

2099

return;

2100

}

2101

}

2102

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

2103

if(devnull == -1){

2104

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

2105

return;

2106

}

2107

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

2108

runnable_hook, alphasort);

1496

2109

if(numhooks == -1){

1497

if(errno == ENOENT){

1498

if(debug){

1499

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

1500

" found\n", hookdir);

1501

}

1502

} else {

1503

perror_plus("scandir");

2110

perror_plus("scandir");

2111

close(devnull);

2112

return;

2113

}

2114

struct dirent *direntry;

2115

int ret;

2116

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

2117

direntry = direntries[i];

2118

if(debug){

2119

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

2120

direntry->d_name);

1504

2121

}

1505

} else {

1506

struct dirent *direntry;

1507

int ret;

1508

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

1509

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

1510

direntry = direntries[i];

1511

char *fullname = NULL;

1512

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

1513

if(ret < 0){

2122

pid_t hook_pid = fork();

2123

if(hook_pid == 0){

2124

/* Child */

2125

/* Raise privileges */

2126

errno = raise_privileges_permanently();

2127

if(errno != 0){

2128

perror_plus("Failed to raise privileges");

2129

_exit(EX_NOPERM);

2130

}

2131

/* Set group */

2132

errno = 0;

2133

ret = setgid(0);

2134

if(ret == -1){

2135

perror_plus("setgid");

2136

_exit(EX_NOPERM);

2137

}

2138

/* Reset supplementary groups */

2139

errno = 0;

2140

ret = setgroups(0, NULL);

2141

if(ret == -1){

2142

perror_plus("setgroups");

2143

_exit(EX_NOPERM);

2144

}

2145

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

2146

if(ret == -1){

2147

perror_plus("setenv");

2148

_exit(EX_OSERR);

2149

}

2150

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

2151

if(ret == -1){

2152

perror_plus("setenv");

2153

_exit(EX_OSERR);

2154

}

2155

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

2156

if(ret == -1){

2157

perror_plus("setenv");

2158

_exit(EX_OSERR);

2159

}

2160

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

2161

if(ret == -1){

2162

perror_plus("setenv");

2163

_exit(EX_OSERR);

2164

}

2165

char *delaystring;

2166

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

2167

if(ret == -1){

1514

2168

perror_plus("asprintf");

1515

continue;

1516

}

1517

if(debug){

1518

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

1519

direntry->d_name);

1520

}

1521

pid_t hook_pid = fork();

1522

if(hook_pid == 0){

1523

/* Child */

1524

/* Raise privileges */

1525

raise_privileges_permanently();

1526

/* Set group */

1527

errno = 0;

1528

ret = setgid(0);

1529

if(ret == -1){

1530

perror_plus("setgid");

1531

}

1532

/* Reset supplementary groups */

1533

errno = 0;

1534

ret = setgroups(0, NULL);

1535

if(ret == -1){

1536

perror_plus("setgroups");

1537

}

1538

dup2(devnull, STDIN_FILENO);

1539

close(devnull);

1540

dup2(STDERR_FILENO, STDOUT_FILENO);

1541

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

1542

if(ret == -1){

1543

perror_plus("setenv");

1544

_exit(EX_OSERR);

1545

}

1546

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

1547

if(ret == -1){

1548

perror_plus("setenv");

1549

_exit(EX_OSERR);

1550

}

1551

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

1552

if(ret == -1){

1553

perror_plus("setenv");

1554

_exit(EX_OSERR);

1555

}

1556

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

1557

if(ret == -1){

1558

perror_plus("setenv");

1559

_exit(EX_OSERR);

1560

}

1561

char *delaystring;

1562

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

1563

if(ret == -1){

1564

perror_plus("asprintf");

1565

_exit(EX_OSERR);

1566

}

1567

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

1568

if(ret == -1){

1569

free(delaystring);

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

2169

_exit(EX_OSERR);

2170

}

2171

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

2172

if(ret == -1){

1573

2173

free(delaystring);

1574

if(connect_to != NULL){

1575

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

1576

if(ret == -1){

1577

perror_plus("setenv");

1578

_exit(EX_OSERR);

1579

}

1580

}

1581

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

1582

perror_plus("execl");

1583

_exit(EXIT_FAILURE);

1584

}

2174

perror_plus("setenv");

2175

_exit(EX_OSERR);

2176

}

2177

free(delaystring);

2178

if(connect_to != NULL){

2179

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

2180

if(ret == -1){

2181

perror_plus("setenv");

2182

_exit(EX_OSERR);

2183

}

2184

}

2185

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

2186

direntry->d_name,

2187

O_RDONLY));

2188

if(hook_fd == -1){

2189

perror_plus("openat");

2190

_exit(EXIT_FAILURE);

2191

}

2192

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

2193

perror_plus("close");

2194

_exit(EXIT_FAILURE);

2195

}

2196

ret = dup2(devnull, STDIN_FILENO);

2197

if(ret == -1){

2198

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

2199

_exit(EX_OSERR);

2200

}

2201

ret = close(devnull);

2202

if(ret == -1){

2203

perror_plus("close");

2204

_exit(EX_OSERR);

2205

}

2206

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2207

if(ret == -1){

2208

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

2209

_exit(EX_OSERR);

2210

}

2211

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

2212

environ) == -1){

2213

perror_plus("fexecve");

2214

_exit(EXIT_FAILURE);

2215

}

2216

} else {

2217

if(hook_pid == -1){

2218

perror_plus("fork");

2219

free(direntry);

2220

continue;

2221

}

2222

int status;

2223

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

2224

perror_plus("waitpid");

2225

free(direntry);

2226

continue;

2227

}

2228

if(WIFEXITED(status)){

2229

if(WEXITSTATUS(status) != 0){

2230

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

2231

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

2232

WEXITSTATUS(status));

2233

free(direntry);

2234

continue;

2235

}

2236

} else if(WIFSIGNALED(status)){

2237

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

2238

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

2239

WTERMSIG(status));

2240

free(direntry);

2241

continue;

1585

2242

} else {

1586

int status;

1587

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

1588

perror_plus("waitpid");

1589

free(fullname);

1590

continue;

1591

}

1592

if(WIFEXITED(status)){

1593

if(WEXITSTATUS(status) != 0){

1594

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

1595

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

1596

WEXITSTATUS(status));

1597

free(fullname);

1598

continue;

1599

}

1600

} else if(WIFSIGNALED(status)){

1601

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

1602

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

1603

WTERMSIG(status));

1604

free(fullname);

1605

continue;

1606

} else {

1607

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

1608

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

1609

free(fullname);

1610

continue;

1611

}

1612

}

1613

free(fullname);

1614

if(debug){

1615

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

1616

direntry->d_name);

1617

}

1618

}

1619

close(devnull);

1620

}

1621

return true;

2243

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

2244

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

2245

free(direntry);

2246

continue;

2247

}

2248

}

2249

if(debug){

2250

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

2251

direntry->d_name);

2252

}

2253

free(direntry);

2254

}

2255

free(direntries);

2256

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

2257

perror_plus("close");

2258

} else {

2259

hookdir_fd = -1;

2260

}

2261

close(devnull);

1622

2262

}

1623

2263

1624

error_t bring_up_interface(const char *const interface,

1625

const float delay){

1626

int sd = -1;

1627

error_t old_errno = errno;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

2264

__attribute__((nonnull, warn_unused_result))

2265

int bring_up_interface(const char *const interface,

2266

const float delay){

2267

int old_errno = errno;

2268

int ret;

1630

2269

struct ifreq network;

1631

2270

unsigned int if_index = if_nametoindex(interface);

1632

2271

if(if_index == 0){

1641

2280

}

1642

2281

1643

2282

if(not interface_is_up(interface)){

1644

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

2283

int ret_errno = 0;

2284

int ioctl_errno = 0;

2285

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

1645

2286

ret_errno = errno;

1646

2287

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

1647

2288

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

2289

errno = old_errno;

1648

2290

return ret_errno;

1649

2291

}

1650

network.ifr_flags |= IFF_UP;

2292

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

1651

2293

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

2294

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

2295

if(sd == -1){

1654

2296

ret_errno = errno;

1655

2297

perror_plus("socket");

1656

2298

errno = old_errno;

1657

2299

return ret_errno;

1658

2300

}

1659

2301

1660

2302

if(quit_now){

1661

close(sd);

2303

ret = close(sd);

2304

if(ret == -1){

2305

perror_plus("close");

2306

}

1662

2307

errno = old_errno;

1663

2308

return EINTR;

1664

2309

}

1668

2313

interface);

1669

2314

}

1670

2315

1671

/* Raise priviliges */

1672

raise_privileges();

2316

/* Raise privileges */

2317

ret_errno = raise_privileges();

2318

if(ret_errno != 0){

2319

errno = ret_errno;

2320

perror_plus("Failed to raise privileges");

2321

}

1673

2322

1674

2323

#ifdef __linux__

1675

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1676

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

1677

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

1678

bool restore_loglevel = true;

1679

if(ret_linux == -1){

1680

restore_loglevel = false;

1681

perror_plus("klogctl");

2324

int ret_linux;

2325

bool restore_loglevel = false;

2326

if(ret_errno == 0){

2327

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2328

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

2329

ret_linux = klogctl(8, NULL, 5);

2330

if(ret_linux == -1){

2331

perror_plus("klogctl");

2332

} else {

2333

restore_loglevel = true;

2334

}

1682

2335

}

1683

2336

#endif /* __linux__ */

1684

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

1685

ret_errno = errno;

2337

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

2338

ioctl_errno = errno;

1686

2339

#ifdef __linux__

1687

2340

if(restore_loglevel){

1688

2341

ret_linux = klogctl(7, NULL, 0);

1692

2345

}

1693

2346

#endif /* __linux__ */

1694

2347

1695

/* Lower privileges */

1696

lower_privileges();

2348

/* If raise_privileges() succeeded above */

2349

if(ret_errno == 0){

2350

/* Lower privileges */

2351

ret_errno = lower_privileges();

2352

if(ret_errno != 0){

2353

errno = ret_errno;

2354

perror_plus("Failed to lower privileges");

2355

}

2356

}

1697

2357

1698

2358

/* Close the socket */

1699

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

2359

ret = close(sd);

1700

2360

if(ret == -1){

1701

2361

perror_plus("close");

1702

2362

}

1703

2363

1704

2364

if(ret_setflags == -1){

1705

errno = ret_errno;

2365

errno = ioctl_errno;

1706

2366

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1707

2367

errno = old_errno;

1708

return ret_errno;

2368

return ioctl_errno;

1709

2369

}

1710

2370

} else if(debug){

1711

2371

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

1714

2374

1715

2375

/* Sleep checking until interface is running.

1716

2376

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

1717

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

2377

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

1718

2378

if(interface_is_running(interface)){

1719

2379

break;

1720

2380

}

1729

2389

return 0;

1730

2390

}

1731

2391

1732

error_t take_down_interface(const char *const interface){

1733

error_t old_errno = errno;

2392

__attribute__((nonnull, warn_unused_result))

2393

int take_down_interface(const char *const interface){

2394

int old_errno = errno;

1734

2395

struct ifreq network;

1735

2396

unsigned int if_index = if_nametoindex(interface);

1736

2397

if(if_index == 0){

1739

2400

return ENXIO;

1740

2401

}

1741

2402

if(interface_is_up(interface)){

1742

error_t ret_errno = 0;

2403

int ret_errno = 0;

2404

int ioctl_errno = 0;

1743

2405

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

1744

2406

ret_errno = errno;

1745

2407

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

1746

2408

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

2409

errno = old_errno;

1747

2410

return ret_errno;

1748

2411

}

1749

2412

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

1750

2413

1751

2414

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

1752

if(sd < 0){

2415

if(sd == -1){

1753

2416

ret_errno = errno;

1754

2417

perror_plus("socket");

1755

2418

errno = old_errno;

1761

2424

interface);

1762

2425

}

1763

2426

1764

/* Raise priviliges */

1765

raise_privileges();

2427

/* Raise privileges */

2428

ret_errno = raise_privileges();

2429

if(ret_errno != 0){

2430

errno = ret_errno;

2431

perror_plus("Failed to raise privileges");

2432

}

1766

2433

1767

2434

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

1768

ret_errno = errno;

2435

ioctl_errno = errno;

1769

2436

1770

/* Lower privileges */

1771

lower_privileges();

2437

/* If raise_privileges() succeeded above */

2438

if(ret_errno == 0){

2439

/* Lower privileges */

2440

ret_errno = lower_privileges();

2441

if(ret_errno != 0){

2442

errno = ret_errno;

2443

perror_plus("Failed to lower privileges");

2444

}

2445

}

1772

2446

1773

2447

/* Close the socket */

1774

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

2448

int ret = close(sd);

1775

2449

if(ret == -1){

1776

2450

perror_plus("close");

1777

2451

}

1778

2452

1779

2453

if(ret_setflags == -1){

1780

errno = ret_errno;

2454

errno = ioctl_errno;

1781

2455

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1782

2456

errno = old_errno;

1783

return ret_errno;

2457

return ioctl_errno;

1784

2458

}

1785

2459

} else if(debug){

1786

2460

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

1792

2466

}

1793

2467

1794

2468

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

1795

mandos_context mc = { .server = NULL, .dh_bits = 1024,

1796

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

1797

"+CTYPE-OPENPGP", .current_server = NULL,

1798

.interfaces = NULL, .interfaces_size = 0 };

2469

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

2470

#if GNUTLS_VERSION_NUMBER >= 0x030606

2471

.priority = "SECURE128:!CTYPE-X.509"

2472

":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"

2473

":%PROFILE_ULTRA",

2474

#elif GNUTLS_VERSION_NUMBER < 0x030600

2475

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

2476

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

2477

#else

2478

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

2479

#endif

2480

.current_server = NULL, .interfaces = NULL,

2481

.interfaces_size = 0 };

1799

2482

AvahiSServiceBrowser *sb = NULL;

1800

2483

error_t ret_errno;

1801

2484

int ret;

1804

2487

int exitcode = EXIT_SUCCESS;

1805

2488

char *interfaces_to_take_down = NULL;

1806

2489

size_t interfaces_to_take_down_size = 0;

1807

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

1808

bool tempdir_created = false;

2490

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

2491

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

2492

char *tempdir = NULL;

1809

2493

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1810

2494

const char *seckey = PATHDIR "/" SECKEY;

1811

2495

const char *pubkey = PATHDIR "/" PUBKEY;

2496

#if GNUTLS_VERSION_NUMBER >= 0x030606

2497

const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;

2498

const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;

2499

#endif

2500

const char *dh_params_file = NULL;

1812

2501

char *interfaces_hooks = NULL;

1813

2502

1814

2503

bool gnutls_initialized = false;

1861

2550

{ .name = "pubkey", .key = 'p',

1862

2551

.arg = "FILE",

1863

2552

.doc = "OpenPGP public key file base name",

1864

.group = 2 },

2553

.group = 1 },

2554

{ .name = "tls-privkey", .key = 't',

2555

.arg = "FILE",

2556

#if GNUTLS_VERSION_NUMBER >= 0x030606

2557

.doc = "TLS private key file base name",

2558

#else

2559

.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",

2560

#endif

2561

.group = 1 },

2562

{ .name = "tls-pubkey", .key = 'T',

2563

.arg = "FILE",

2564

#if GNUTLS_VERSION_NUMBER >= 0x030606

2565

.doc = "TLS public key file base name",

2566

#else

2567

.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",

2568

#endif

2569

.group = 1 },

1865

2570

{ .name = "dh-bits", .key = 129,

1866

2571

.arg = "BITS",

1867

2572

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

1868

2573

" Diffie-Hellman key exchange",

1869

2574

.group = 2 },

2575

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

2576

.arg = "FILE",

2577

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

2578

" for the Diffie-Hellman key exchange",

2579

.group = 2 },

1870

2580

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

1871

2581

.arg = "STRING",

1872

2582

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

1918

2628

case 'p': /* --pubkey */

1919

2629

pubkey = arg;

1920

2630

break;

2631

case 't': /* --tls-privkey */

2632

#if GNUTLS_VERSION_NUMBER >= 0x030606

2633

tls_privkey = arg;

2634

#endif

2635

break;

2636

case 'T': /* --tls-pubkey */

2637

#if GNUTLS_VERSION_NUMBER >= 0x030606

2638

tls_pubkey = arg;

2639

#endif

2640

break;

1921

2641

case 129: /* --dh-bits */

1922

2642

errno = 0;

1923

2643

tmpmax = strtoimax(arg, &tmp, 10);

1927

2647

}

1928

2648

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

1929

2649

break;

2650

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

2651

dh_params_file = arg;

2652

break;

1930

2653

case 130: /* --priority */

1931

2654

mc.priority = arg;

1932

2655

break;

1955

2678

argp_state_help(state, state->out_stream,

1956

2679

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1957

2680

& ~(unsigned int)ARGP_HELP_EXIT_OK);

2681

__builtin_unreachable();

1958

2682

case -3: /* --usage */

1959

2683

argp_state_help(state, state->out_stream,

1960

2684

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2685

__builtin_unreachable();

1961

2686

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

1962

2687

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

1963

2688

exit(argp_err_exit_status);

1972

2697

.args_doc = "",

1973

2698

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

1974

2699

" passwords from a Mandos server" };

1975

ret = argp_parse(&argp, argc, argv,

1976

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1977

switch(ret){

2700

ret_errno = argp_parse(&argp, argc, argv,

2701

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2702

switch(ret_errno){

1978

2703

case 0:

1979

2704

break;

1980

2705

case ENOMEM:

1981

2706

default:

1982

errno = ret;

2707

errno = ret_errno;

1983

2708

perror_plus("argp_parse");

1984

2709

exitcode = EX_OSERR;

1985

2710

goto end;

1988

2713

goto end;

1989

2714

}

1990

2715

}

1991

2716

1992

2717

{

1993

2718

/* Work around Debian bug #633582:

1994

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

2719

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

1995

2720

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2721

/* Re-raise privileges */

2722

ret = raise_privileges();

2723

if(ret != 0){

2724

errno = ret;

2725

perror_plus("Failed to raise privileges");

2726

} else {

1998

2727

struct stat st;

1999

2728

2000

2729

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

2014

2743

}

2015

2744

}

2016

2745

}

2017

TEMP_FAILURE_RETRY(close(seckey_fd));

2746

close(seckey_fd);

2018

2747

}

2019

2748

}

2020

2749

2021

2750

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

2022

2751

int pubkey_fd = open(pubkey, O_RDONLY);

2023

2752

if(pubkey_fd == -1){

2035

2764

}

2036

2765

}

2037

2766

}

2038

TEMP_FAILURE_RETRY(close(pubkey_fd));

2039

}

2040

}

2041

2767

close(pubkey_fd);

2768

}

2769

}

2770

2771

if(dh_params_file != NULL

2772

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

2773

int dhparams_fd = open(dh_params_file, O_RDONLY);

2774

if(dhparams_fd == -1){

2775

perror_plus("open");

2776

} else {

2777

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

2778

if(ret == -1){

2779

perror_plus("fstat");

2780

} else {

2781

if(S_ISREG(st.st_mode)

2782

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

2783

ret = fchown(dhparams_fd, uid, gid);

2784

if(ret == -1){

2785

perror_plus("fchown");

2786

}

2787

}

2788

}

2789

close(dhparams_fd);

2790

}

2791

}

2792

2042

2793

/* Lower privileges */

2043

lower_privileges();

2794

ret = lower_privileges();

2795

if(ret != 0){

2796

errno = ret;

2797

perror_plus("Failed to lower privileges");

2798

}

2044

2799

}

2045

2800

}

2046

2801

2072

2827

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

2073

2828

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

2074

2829

}

2075

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

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

2830

run_network_hooks("start", interfaces_hooks != NULL ?

2831

interfaces_hooks : "", delay);

2079

2832

}

2080

2833

2081

2834

if(not debug){

2159

2912

2160

2913

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

2161

2914

if(mc.interfaces == NULL){

2162

struct dirent **direntries;

2915

struct dirent **direntries = NULL;

2163

2916

/* Look for any good interfaces */

2164

2917

ret = scandir(sys_class_net, &direntries, good_interface,

2165

2918

alphasort);

2171

2924

if(ret_errno != 0){

2172

2925

errno = ret_errno;

2173

2926

perror_plus("argz_add");

2927

free(direntries[i]);

2174

2928

continue;

2175

2929

}

2176

2930

if(debug){

2177

2931

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

2178

2932

direntries[i]->d_name);

2179

2933

}

2934

free(direntries[i]);

2180

2935

}

2181

2936

free(direntries);

2182

2937

} else {

2183

free(direntries);

2938

if(ret == 0){

2939

free(direntries);

2940

}

2184

2941

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

2185

2942

exitcode = EXIT_FAILURE;

2186

2943

goto end;

2209

2966

break;

2210

2967

}

2211

2968

bool interface_was_up = interface_is_up(interface);

2212

ret = bring_up_interface(interface, delay);

2969

errno = bring_up_interface(interface, delay);

2213

2970

if(not interface_was_up){

2214

if(ret != 0){

2215

errno = ret;

2216

perror_plus("Failed to bring up interface");

2971

if(errno != 0){

2972

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

2973

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

2217

2974

} else {

2218

ret_errno = argz_add(&interfaces_to_take_down,

2219

&interfaces_to_take_down_size,

2220

interface);

2221

if(ret_errno != 0){

2222

errno = ret_errno;

2975

errno = argz_add(&interfaces_to_take_down,

2976

&interfaces_to_take_down_size,

2977

interface);

2978

if(errno != 0){

2223

2979

perror_plus("argz_add");

2224

2980

}

2225

2981

}

2243

2999

goto end;

2244

3000

}

2245

3001

2246

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

3002

#if GNUTLS_VERSION_NUMBER >= 0x030606

3003

ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);

3004

#elif GNUTLS_VERSION_NUMBER < 0x030600

3005

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

3006

#else

3007

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

3008

#endif

2247

3009

if(ret == -1){

2248

3010

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

2249

3011

exitcode = EX_UNAVAILABLE;

2256

3018

goto end;

2257

3019

}

2258

3020

2259

if(mkdtemp(tempdir) == NULL){

3021

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

3022

tempdir = mkdtemp(run_tempdir);

3023

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

3024

if(debug){

3025

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

3026

run_tempdir, old_tempdir);

3027

}

3028

tempdir = mkdtemp(old_tempdir);

3029

}

3030

if(tempdir == NULL){

2260

3031

perror_plus("mkdtemp");

2261

3032

goto end;

2262

3033

}

2263

tempdir_created = true;

2264

3034

2265

3035

if(quit_now){

2266

3036

goto end;

2341

3111

sleep((unsigned int)retry_interval);

2342

3112

}

2343

3113

2344

if (not quit_now){

3114

if(not quit_now){

2345

3115

exitcode = EXIT_SUCCESS;

2346

3116

}

2347

3117

2363

3133

2364

3134

/* Allocate a new server */

2365

3135

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2366

&config, NULL, NULL, &ret_errno);

3136

&config, NULL, NULL, &ret);

2367

3137

2368

3138

/* Free the Avahi configuration data */

2369

3139

avahi_server_config_free(&config);

2372

3142

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

2373

3143

if(mc.server == NULL){

2374

3144

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

2375

avahi_strerror(ret_errno));

3145

avahi_strerror(ret));

2376

3146

exitcode = EX_UNAVAILABLE;

2377

3147

goto end;

2378

3148

}

2402

3172

if(debug){

2403

3173

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

2404

3174

}

2405

3175

2406

3176

ret = avahi_loop_with_timeout(simple_poll,

2407

3177

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

2408

3178

if(debug){

2413

3183

end:

2414

3184

2415

3185

if(debug){

2416

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

3186

if(signal_received){

3187

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

3188

argv[0], signal_received,

3189

strsignal(signal_received));

3190

} else {

3191

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

3192

}

2417

3193

}

2418

3194

2419

3195

/* Cleanup things */

2430

3206

2431

3207

if(gnutls_initialized){

2432

3208

gnutls_certificate_free_credentials(mc.cred);

2433

gnutls_global_deinit();

2434

3209

gnutls_dh_params_deinit(mc.dh_params);

2435

3210

}

2436

3211

2444

3219

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

2445

3220

while(mc.current_server != NULL){

2446

3221

server *next = mc.current_server->next;

3222

#ifdef __GNUC__

3223

#pragma GCC diagnostic push

3224

#pragma GCC diagnostic ignored "-Wcast-qual"

3225

#endif

3226

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

3227

#ifdef __GNUC__

3228

#pragma GCC diagnostic pop

3229

#endif

2447

3230

free(mc.current_server);

2448

3231

mc.current_server = next;

2449

3232

}

2450

3233

}

2451

3234

2452

/* Re-raise priviliges */

3235

/* Re-raise privileges */

2453

3236

{

2454

raise_privileges();

2455

2456

/* Run network hooks */

2457

run_network_hooks("stop", interfaces_hooks != NULL ?

2458

interfaces_hooks : "", delay);

2459

2460

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

2461

{

2462

char *interface = NULL;

2463

while((interface=argz_next(interfaces_to_take_down,

2464

interfaces_to_take_down_size,

2465

interface))){

2466

ret_errno = take_down_interface(interface);

2467

if(ret_errno != 0){

2468

errno = ret_errno;

2469

perror_plus("Failed to take down interface");

2470

}

2471

}

2472

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

2473

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

2474

" down\n");

2475

}

2476

}

2477

2478

lower_privileges_permanently();

3237

ret = raise_privileges();

3238

if(ret != 0){

3239

errno = ret;

3240

perror_plus("Failed to raise privileges");

3241

} else {

3242

3243

/* Run network hooks */

3244

run_network_hooks("stop", interfaces_hooks != NULL ?

3245

interfaces_hooks : "", delay);

3246

3247

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

3248

{

3249

char *interface = NULL;

3250

while((interface = argz_next(interfaces_to_take_down,

3251

interfaces_to_take_down_size,

3252

interface))){

3253

ret = take_down_interface(interface);

3254

if(ret != 0){

3255

errno = ret;

3256

perror_plus("Failed to take down interface");

3257

}

3258

}

3259

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

3260

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

3261

" down\n");

3262

}

3263

}

3264

}

3265

3266

ret = lower_privileges_permanently();

3267

if(ret != 0){

3268

errno = ret;

3269

perror_plus("Failed to lower privileges permanently");

3270

}

2479

3271

}

2480

3272

2481

3273

free(interfaces_to_take_down);

2482

3274

free(interfaces_hooks);

2483

3275

3276

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

3277

uintmax_t level){

3278

struct dirent **direntries = NULL;

3279

int dret;

3280

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

3281

O_RDONLY

3282

| O_NOFOLLOW

3283

| O_DIRECTORY

3284

| O_PATH));

3285

if(dir_fd == -1){

3286

perror_plus("open");

3287

return;

3288

}

3289

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

3290

notdotentries, alphasort);

3291

if(numentries >= 0){

3292

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

3293

if(debug){

3294

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

3295

dirname, direntries[i]->d_name);

3296

}

3297

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

3298

if(dret == -1){

3299

if(errno == EISDIR){

3300

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

3301

AT_REMOVEDIR);

3302

}

3303

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

3304

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

3305

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

3306

/* Recurse only in this special case */

3307

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

3308

dret = 0;

3309

}

3310

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

3311

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

3312

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

3313

}

3314

}

3315

free(direntries[i]);

3316

}

3317

3318

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

3319

free(direntries);

3320

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3321

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

3322

perror_plus("rmdir");

3323

}

3324

} else {

3325

perror_plus("scandirat");

3326

}

3327

close(dir_fd);

3328

}

3329

2484

3330

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

2485

if(tempdir_created){

2486

struct dirent **direntries = NULL;

2487

struct dirent *direntry = NULL;

2488

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

2489

alphasort);

2490

if (numentries > 0){

2491

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

2492

direntry = direntries[i];

2493

char *fullname = NULL;

2494

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

2495

direntry->d_name);

2496

if(ret < 0){

2497

perror_plus("asprintf");

2498

continue;

2499

}

2500

ret = remove(fullname);

2501

if(ret == -1){

2502

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

2503

strerror(errno));

2504

}

2505

free(fullname);

2506

}

2507

}

2508

2509

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

2510

free(direntries);

2511

if (numentries == -1){

2512

perror_plus("scandir");

2513

}

2514

ret = rmdir(tempdir);

2515

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

2516

perror_plus("rmdir");

2517

}

3331

if(tempdir != NULL){

3332

clean_dir_at(-1, tempdir, 0);

2518

3333

}

2519

3334

2520

3335

if(quit_now){