/mandos/trunk : revision 669

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

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*

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* Everything else is

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*

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* This file is part of Mandos.

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*

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

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

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

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* (at your option) any later version.

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*

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

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*

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

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

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

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

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*

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

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* WITHOUT ANY WARRANTY; without even the implied warranty of

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

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* General Public License for more details.

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*

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

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

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* along with this program. If not, see

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

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*

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* Contact the authors at <mandos@recompile.se>.

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*/

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

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif /* not _LARGEFILE_SOURCE */

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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

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

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stdout, ferror() */

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stdout, ferror(), remove() */

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#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

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#include <stddef.h> /* NULL, size_t, ssize_t */

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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

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strtof(), abort() */

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

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

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

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

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#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(), unlinkat(), AT_REMOVEDIR */

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

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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, EINTR, EINVAL,

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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

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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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unlinkat() */

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setgid(), pause(), _exit() */

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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), nonnull))

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

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

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va_list ap;

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va_start (ap, format);

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* 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;

267

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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){

286

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;

290

}

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errno = old_errno;

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return ret;

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}

294

295

/* 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;

306

}

307

errno = old_errno;

308

return ret;

309

}

310

311

/* 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;

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}

322

323

/* Lower privileges permanently */

324

__attribute__((warn_unused_result))

325

int lower_privileges_permanently(void){

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int old_errno = errno;

327

int ret = 0;

328

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

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ret = errno;

330

}

331

errno = old_errno;

332

return ret;

333

}

334

335

255

/*

336

256

* Initialize GPGME.

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257

*/

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,

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mandos_context *mc){

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

259

const char *tempdir, mandos_context *mc){

343

260

gpgme_error_t rc;

344

261

gpgme_engine_info_t engine_info;

345

262

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/*

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

348

265

*/

349

bool import_key(const char * const filename){

266

bool import_key(const char *filename){

350

267

int ret;

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int fd;

352

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gpgme_data_t pgp_data;

357

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return false;

358

275

}

359

276

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);

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

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struct tm tm;

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

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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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}

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} else {

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if(debug){

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

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}

381

}

382

}

383

struct stat keystat;

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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");

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break;

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}

395

if(debug){

396

fprintf_plus(stderr,

397

"Setting system clock to key file mtime");

398

}

399

time_t keytime = keystat.st_mtim.tv_sec;

400

if(stime(&keytime) != 0){

401

perror_plus("stime");

402

}

403

ret = lower_privileges();

404

if(ret != 0){

405

errno = ret;

406

perror_plus("Failed to lower privileges");

407

}

408

} while(false);

409

410

277

rc = gpgme_data_new_from_fd(&pgp_data, fd);

411

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if(rc != GPG_ERR_NO_ERROR){

412

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

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gpgme_strsource(rc), gpgme_strerror(rc));

421

288

return false;

422

289

}

423

{

424

gpgme_import_result_t import_result

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= gpgme_op_import_result(mc->ctx);

426

if((import_result->imported < 1

427

or import_result->not_imported > 0)

428

and import_result->unchanged == 0){

429

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

430

fprintf_plus(stderr,

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

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import_result->considered);

433

fprintf_plus(stderr,

434

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

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import_result->no_user_id);

436

fprintf_plus(stderr,

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

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import_result->imported);

439

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

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import_result->imported_rsa);

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

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import_result->unchanged);

443

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

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import_result->new_user_ids);

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

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import_result->new_sub_keys);

447

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

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import_result->new_signatures);

449

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

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import_result->new_revocations);

451

fprintf_plus(stderr,

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

453

import_result->secret_read);

454

fprintf_plus(stderr,

455

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

456

import_result->secret_imported);

457

fprintf_plus(stderr,

458

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

459

import_result->secret_unchanged);

460

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

461

import_result->not_imported);

462

for(gpgme_import_status_t import_status

463

= import_result->imports;

464

import_status != NULL;

465

import_status = import_status->next){

466

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

467

import_status->fpr);

468

if(import_status->result != GPG_ERR_NO_ERROR){

469

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

470

gpgme_strsource(import_status->result),

471

gpgme_strerror(import_status->result));

472

}

473

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

474

fprintf_plus(stderr,

475

import_status->status & GPGME_IMPORT_NEW

476

? "The key was new.\n"

477

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

478

fprintf_plus(stderr,

479

import_status->status & GPGME_IMPORT_UID

480

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

481

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

482

fprintf_plus(stderr,

483

import_status->status & GPGME_IMPORT_SIG

484

? "The key contained new signatures.\n"

485

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

486

fprintf_plus(stderr,

487

import_status->status & GPGME_IMPORT_SUBKEY

488

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

489

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

490

fprintf_plus(stderr,

491

import_status->status & GPGME_IMPORT_SECRET

492

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

493

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

494

}

495

return false;

496

}

497

}

498

290

499

ret = close(fd);

291

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

500

292

if(ret == -1){

501

293

perror_plus("close");

502

294

}

541

333

/* Create new GPGME "context" */

542

334

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

543

335

if(rc != GPG_ERR_NO_ERROR){

544

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

545

gpgme_strsource(rc), gpgme_strerror(rc));

336

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

337

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

338

gpgme_strerror(rc));

546

339

return false;

547

340

}

548

341

557

350

* Decrypt OpenPGP data.

558

351

* Returns -1 on error

559

352

*/

560

__attribute__((nonnull, warn_unused_result))

561

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

562

354

size_t crypto_size,

563

355

char **plaintext,

584

376

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

585

377

rc = gpgme_data_new(&dh_plain);

586

378

if(rc != GPG_ERR_NO_ERROR){

587

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

379

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

380

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

588

381

gpgme_strsource(rc), gpgme_strerror(rc));

589

382

gpgme_data_release(dh_crypto);

590

383

return -1;

603

396

if(result == NULL){

604

397

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

605

398

} else {

606

if(result->unsupported_algorithm != NULL) {

607

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

608

result->unsupported_algorithm);

609

}

610

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

611

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

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);

612

403

if(result->file_name != NULL){

613

404

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

614

405

}

615

616

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

617

r = r->next){

406

gpgme_recipient_t recipient;

407

recipient = result->recipients;

408

while(recipient != NULL){

618

409

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

619

gpgme_pubkey_algo_name(r->pubkey_algo));

620

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

410

gpgme_pubkey_algo_name

411

(recipient->pubkey_algo));

412

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

621

413

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

622

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

414

recipient->status == GPG_ERR_NO_SECKEY

415

? "No" : "Yes");

416

recipient = recipient->next;

623

417

}

624

418

}

625

419

}

681

475

return plaintext_length;

682

476

}

683

477

684

__attribute__((warn_unused_result, const))

685

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

686

if(str == NULL)

687

return "(unknown)";

688

return str;

689

}

690

691

__attribute__((warn_unused_result))

692

static const char *safer_gnutls_strerror(int value){

478

static const char * safer_gnutls_strerror(int value){

693

479

const char *ret = gnutls_strerror(value);

694

return safe_string(ret);

480

if(ret == NULL)

481

ret = "(unknown)";

482

return ret;

695

483

}

696

484

697

485

/* GnuTLS log function callback */

698

__attribute__((nonnull))

699

486

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

700

487

const char* string){

701

488

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

702

489

}

703

490

704

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

705

491

static int init_gnutls_global(const char *pubkeyfilename,

706

492

const char *seckeyfilename,

707

const char *dhparamsfilename,

708

493

mandos_context *mc){

709

494

int ret;

710

495

712

497

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

713

498

}

714

499

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

715

507

if(debug){

716

508

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

717

509

* - GnuTLS manual

725

517

if(ret != GNUTLS_E_SUCCESS){

726

518

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

727

519

safer_gnutls_strerror(ret));

520

gnutls_global_deinit();

728

521

return -1;

729

522

}

730

523

731

524

if(debug){

732

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

733

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

525

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

526

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

734

527

pubkeyfilename,

735

528

seckeyfilename);

736

529

}

737

530

738

#if GNUTLS_VERSION_NUMBER >= 0x030606

739

ret = gnutls_certificate_set_rawpk_key_file

740

(mc->cred, pubkeyfilename, seckeyfilename,

741

GNUTLS_X509_FMT_PEM, /* format */

742

NULL, /* pass */

743

/* key_usage */

744

GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,

745

NULL, /* names */

746

0, /* names_length */

747

/* privkey_flags */

748

GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,

749

0); /* pkcs11_flags */

750

#elif GNUTLS_VERSION_NUMBER < 0x030600

751

531

ret = gnutls_certificate_set_openpgp_key_file

752

532

(mc->cred, pubkeyfilename, seckeyfilename,

753

533

GNUTLS_OPENPGP_FMT_BASE64);

754

#else

755

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

756

#endif

757

534

if(ret != GNUTLS_E_SUCCESS){

758

535

fprintf_plus(stderr,

759

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

536

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

760

537

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

761

538

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

762

539

safer_gnutls_strerror(ret));

771

548

safer_gnutls_strerror(ret));

772

549

goto globalfail;

773

550

}

774

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

775

if(dhparamsfilename != NULL){

776

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

777

do {

778

int dhpfile = open(dhparamsfilename, O_RDONLY);

779

if(dhpfile == -1){

780

perror_plus("open");

781

dhparamsfilename = NULL;

782

break;

783

}

784

size_t params_capacity = 0;

785

while(true){

786

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

787

(size_t)params.size,

788

(size_t)params_capacity);

789

if(params_capacity == 0){

790

perror_plus("incbuffer");

791

free(params.data);

792

params.data = NULL;

793

dhparamsfilename = NULL;

794

break;

795

}

796

ssize_t bytes_read = read(dhpfile,

797

params.data + params.size,

798

BUFFER_SIZE);

799

/* EOF */

800

if(bytes_read == 0){

801

break;

802

}

803

/* check bytes_read for failure */

804

if(bytes_read < 0){

805

perror_plus("read");

806

free(params.data);

807

params.data = NULL;

808

dhparamsfilename = NULL;

809

break;

810

}

811

params.size += (unsigned int)bytes_read;

812

}

813

ret = close(dhpfile);

814

if(ret == -1){

815

perror_plus("close");

816

}

817

if(params.data == NULL){

818

dhparamsfilename = NULL;

819

}

820

if(dhparamsfilename == NULL){

821

break;

822

}

823

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

824

GNUTLS_X509_FMT_PEM);

825

if(ret != GNUTLS_E_SUCCESS){

826

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

827

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

828

safer_gnutls_strerror(ret));

829

dhparamsfilename = NULL;

830

}

831

free(params.data);

832

} while(false);

833

}

834

if(dhparamsfilename == NULL){

835

if(mc->dh_bits == 0){

836

#if GNUTLS_VERSION_NUMBER < 0x030600

837

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

838

/* Try to read the private key file */

839

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

840

do {

841

int secfile = open(seckeyfilename, O_RDONLY);

842

if(secfile == -1){

843

perror_plus("open");

844

break;

845

}

846

size_t buffer_capacity = 0;

847

while(true){

848

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

849

(size_t)buffer.size,

850

(size_t)buffer_capacity);

851

if(buffer_capacity == 0){

852

perror_plus("incbuffer");

853

free(buffer.data);

854

buffer.data = NULL;

855

break;

856

}

857

ssize_t bytes_read = read(secfile,

858

buffer.data + buffer.size,

859

BUFFER_SIZE);

860

/* EOF */

861

if(bytes_read == 0){

862

break;

863

}

864

/* check bytes_read for failure */

865

if(bytes_read < 0){

866

perror_plus("read");

867

free(buffer.data);

868

buffer.data = NULL;

869

break;

870

}

871

buffer.size += (unsigned int)bytes_read;

872

}

873

close(secfile);

874

} while(false);

875

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

876

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

877

if(buffer.data != NULL){

878

{

879

gnutls_openpgp_privkey_t privkey = NULL;

880

ret = gnutls_openpgp_privkey_init(&privkey);

881

if(ret != GNUTLS_E_SUCCESS){

882

fprintf_plus(stderr, "Error initializing OpenPGP key"

883

" structure: %s",

884

safer_gnutls_strerror(ret));

885

free(buffer.data);

886

buffer.data = NULL;

887

} else {

888

ret = gnutls_openpgp_privkey_import

889

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

890

if(ret != GNUTLS_E_SUCCESS){

891

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

892

safer_gnutls_strerror(ret));

893

privkey = NULL;

894

}

895

free(buffer.data);

896

buffer.data = NULL;

897

if(privkey != NULL){

898

/* Use private key to suggest an appropriate

899

sec_param */

900

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

901

gnutls_openpgp_privkey_deinit(privkey);

902

if(debug){

903

fprintf_plus(stderr, "This OpenPGP key implies using"

904

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

905

safe_string(gnutls_sec_param_get_name

906

(sec_param)));

907

}

908

}

909

}

910

}

911

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

912

/* Err on the side of caution */

913

sec_param = GNUTLS_SEC_PARAM_ULTRA;

914

if(debug){

915

fprintf_plus(stderr, "Falling back to security parameter"

916

" \"%s\"\n",

917

safe_string(gnutls_sec_param_get_name

918

(sec_param)));

919

}

920

}

921

}

922

unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

923

if(uret != 0){

924

mc->dh_bits = uret;

925

if(debug){

926

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

927

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

928

safe_string(gnutls_sec_param_get_name

929

(sec_param)),

930

mc->dh_bits);

931

}

932

} else {

933

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

934

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

935

safe_string(gnutls_sec_param_get_name

936

(sec_param)),

937

safer_gnutls_strerror(ret));

938

goto globalfail;

939

}

940

#endif

941

} else { /* dh_bits != 0 */

942

if(debug){

943

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

944

mc->dh_bits);

945

}

946

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

947

if(ret != GNUTLS_E_SUCCESS){

948

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

949

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

950

safer_gnutls_strerror(ret));

951

goto globalfail;

952

}

953

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

954

}

955

}

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);

956

559

957

560

return 0;

958

561

959

562

globalfail:

960

563

961

564

gnutls_certificate_free_credentials(mc->cred);

565

gnutls_global_deinit();

962

566

gnutls_dh_params_deinit(mc->dh_params);

963

567

return -1;

964

568

}

965

569

966

__attribute__((nonnull, warn_unused_result))

967

570

static int init_gnutls_session(gnutls_session_t *session,

968

571

mandos_context *mc){

969

572

int ret;

970

573

/* GnuTLS session creation */

971

574

do {

972

ret = gnutls_init(session, (GNUTLS_SERVER

973

#if GNUTLS_VERSION_NUMBER >= 0x030506

974

| GNUTLS_NO_TICKETS

975

#endif

976

#if GNUTLS_VERSION_NUMBER >= 0x030606

977

| GNUTLS_ENABLE_RAWPK

978

#endif

979

));

575

ret = gnutls_init(session, GNUTLS_SERVER);

980

576

if(quit_now){

981

577

return -1;

982

578

}

1023

619

/* ignore client certificate if any. */

1024

620

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

1025

621

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

623

1026

624

return 0;

1027

625

}

1028

626

1030

628

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

1031

629

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

1032

630

1033

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

1034

__attribute__((nonnull, warn_unused_result))

1035

static bool add_delete_local_route(const bool add,

1036

const char *address,

1037

AvahiIfIndex if_index){

1038

int ret;

1039

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

1040

char add_arg[] = "add";

1041

char delete_arg[] = "delete";

1042

char debug_flag[] = "--debug";

1043

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

1044

if(pluginhelperdir == NULL){

1045

if(debug){

1046

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

1047

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

1048

}

1049

return false;

1050

}

1051

1052

char interface[IF_NAMESIZE];

1053

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

1054

perror_plus("if_indextoname");

1055

return false;

1056

}

1057

1058

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

1059

if(devnull == -1){

1060

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

1061

return false;

1062

}

1063

pid_t pid = fork();

1064

if(pid == 0){

1065

/* Child */

1066

/* Raise privileges */

1067

errno = raise_privileges_permanently();

1068

if(errno != 0){

1069

perror_plus("Failed to raise privileges");

1070

/* _exit(EX_NOPERM); */

1071

} else {

1072

/* Set group */

1073

errno = 0;

1074

ret = setgid(0);

1075

if(ret == -1){

1076

perror_plus("setgid");

1077

close(devnull);

1078

_exit(EX_NOPERM);

1079

}

1080

/* Reset supplementary groups */

1081

errno = 0;

1082

ret = setgroups(0, NULL);

1083

if(ret == -1){

1084

perror_plus("setgroups");

1085

close(devnull);

1086

_exit(EX_NOPERM);

1087

}

1088

}

1089

ret = dup2(devnull, STDIN_FILENO);

1090

if(ret == -1){

1091

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

1092

close(devnull);

1093

_exit(EX_OSERR);

1094

}

1095

ret = close(devnull);

1096

if(ret == -1){

1097

perror_plus("close");

1098

}

1099

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1100

if(ret == -1){

1101

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

1102

_exit(EX_OSERR);

1103

}

1104

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

1105

O_RDONLY

1106

| O_DIRECTORY

1107

| O_PATH

1108

| O_CLOEXEC));

1109

if(helperdir_fd == -1){

1110

perror_plus("open");

1111

_exit(EX_UNAVAILABLE);

1112

}

1113

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

1114

helper, O_RDONLY));

1115

if(helper_fd == -1){

1116

perror_plus("openat");

1117

close(helperdir_fd);

1118

_exit(EX_UNAVAILABLE);

1119

}

1120

close(helperdir_fd);

1121

#ifdef __GNUC__

1122

#pragma GCC diagnostic push

1123

#pragma GCC diagnostic ignored "-Wcast-qual"

1124

#endif

1125

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

1126

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

1127

interface, debug ? debug_flag : NULL, NULL },

1128

environ) == -1){

1129

#ifdef __GNUC__

1130

#pragma GCC diagnostic pop

1131

#endif

1132

perror_plus("fexecve");

1133

_exit(EXIT_FAILURE);

1134

}

1135

}

1136

if(pid == -1){

1137

perror_plus("fork");

1138

close(devnull);

1139

return false;

1140

}

1141

ret = close(devnull);

1142

if(ret == -1){

1143

perror_plus("close");

1144

}

1145

int status;

1146

pid_t pret = -1;

1147

errno = 0;

1148

do {

1149

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

1150

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

1151

int errno_raising = 0;

1152

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

1153

errno_raising = errno;

1154

perror_plus("Failed to raise privileges in order to"

1155

" kill helper program");

1156

}

1157

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

1158

perror_plus("kill");

1159

}

1160

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

1161

perror_plus("Failed to lower privileges after killing"

1162

" helper program");

1163

}

1164

return false;

1165

}

1166

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

1167

if(pret == -1){

1168

perror_plus("waitpid");

1169

return false;

1170

}

1171

if(WIFEXITED(status)){

1172

if(WEXITSTATUS(status) != 0){

1173

fprintf_plus(stderr, "Error: iprouteadddel exited"

1174

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

1175

return false;

1176

}

1177

return true;

1178

}

1179

if(WIFSIGNALED(status)){

1180

fprintf_plus(stderr, "Error: iprouteadddel died by"

1181

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

1182

return false;

1183

}

1184

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

1185

return false;

1186

}

1187

1188

__attribute__((nonnull, warn_unused_result))

1189

static bool add_local_route(const char *address,

1190

AvahiIfIndex if_index){

1191

if(debug){

1192

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

1193

}

1194

return add_delete_local_route(true, address, if_index);

1195

}

1196

1197

__attribute__((nonnull, warn_unused_result))

1198

static bool delete_local_route(const char *address,

1199

AvahiIfIndex if_index){

1200

if(debug){

1201

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

1202

}

1203

return add_delete_local_route(false, address, if_index);

1204

}

1205

1206

631

/* Called when a Mandos server is found */

1207

__attribute__((nonnull, warn_unused_result))

1208

632

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

1209

633

AvahiIfIndex if_index,

1210

634

int af, mandos_context *mc){

1219

643

int retval = -1;

1220

644

gnutls_session_t session;

1221

645

int pf; /* Protocol family */

1222

bool route_added = false;

1223

646

1224

647

errno = 0;

1225

648

1247

670

bool match = false;

1248

671

{

1249

672

char *interface = NULL;

1250

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

1251

mc->interfaces_size,

1252

interface))){

673

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

674

interface))){

1253

675

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

1254

676

match = true;

1255

677

break;

1284

706

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

1285

707

}

1286

708

1287

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

709

tcp_sd = socket(pf, SOCK_STREAM, 0);

1288

710

if(tcp_sd < 0){

1289

711

int e = errno;

1290

712

perror_plus("socket");

1297

719

goto mandos_end;

1298

720

}

1299

721

722

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

1300

723

if(af == AF_INET6){

1301

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

1302

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

1303

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

724

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

725

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

1304

726

} else { /* IPv4 */

1305

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

1306

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

1307

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

727

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

728

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

1308

729

}

1309

730

if(ret < 0 ){

1310

731

int e = errno;

1319

740

goto mandos_end;

1320

741

}

1321

742

if(af == AF_INET6){

1322

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

743

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

1323

744

if(IN6_IS_ADDR_LINKLOCAL

1324

745

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

1325

746

if(if_index == AVAHI_IF_UNSPEC){

1380

801

goto mandos_end;

1381

802

}

1382

803

1383

while(true){

1384

if(af == AF_INET6){

1385

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

1386

sizeof(struct sockaddr_in6));

1387

} else {

1388

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

1389

sizeof(struct sockaddr_in));

1390

}

1391

if(ret < 0){

1392

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

1393

and if_index != AVAHI_IF_UNSPEC

1394

and connect_to == NULL

1395

and not route_added and

1396

((af == AF_INET6 and not

1397

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1398

&to)->sin6_addr)))

1399

or (af == AF_INET and

1400

/* Not a a IPv4LL address */

1401

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

1402

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

1403

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

1404

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

1405

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

1406

connect to a Mandos server announced by Avahi on a server

1407

host with a global address. Work around this by retrying

1408

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

1409

1410

Avahi bug reference:

1411

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

1412

https://bugs.debian.org/587961

1413

*/

1414

if(debug){

1415

fprintf_plus(stderr, "Mandos server unreachable, trying"

1416

" direct route\n");

1417

}

1418

int e = errno;

1419

route_added = add_local_route(ip, if_index);

1420

if(route_added){

1421

continue;

1422

}

1423

errno = e;

1424

}

1425

if(errno != ECONNREFUSED or debug){

1426

int e = errno;

1427

perror_plus("connect");

1428

errno = e;

1429

}

1430

goto mandos_end;

1431

}

1432

1433

if(quit_now){

1434

errno = EINTR;

1435

goto mandos_end;

1436

}

1437

break;

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;

1438

823

}

1439

824

1440

825

const char *out = mandos_protocol_version;

1594

979

&decrypted_buffer, mc);

1595

980

if(decrypted_buffer_size >= 0){

1596

981

1597

clearerr(stdout);

1598

982

written = 0;

1599

983

while(written < (size_t) decrypted_buffer_size){

1600

984

if(quit_now){

1616

1000

}

1617

1001

written += (size_t)ret;

1618

1002

}

1619

ret = fflush(stdout);

1620

if(ret != 0){

1621

int e = errno;

1622

if(debug){

1623

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

1624

strerror(errno));

1625

}

1626

errno = e;

1627

goto mandos_end;

1628

}

1629

1003

retval = 0;

1630

1004

}

1631

1005

}

1634

1008

1635

1009

mandos_end:

1636

1010

{

1637

if(route_added){

1638

if(not delete_local_route(ip, if_index)){

1639

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

1640

" interface %d", ip, if_index);

1641

}

1642

}

1643

1011

int e = errno;

1644

1012

free(decrypted_buffer);

1645

1013

free(buffer);

1646

1014

if(tcp_sd >= 0){

1647

ret = close(tcp_sd);

1015

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

1648

1016

}

1649

1017

if(ret == -1){

1650

1018

if(e == 0){

1675

1043

AVAHI_GCC_UNUSED AvahiStringList *txt,

1676

1044

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1677

1045

flags,

1678

void *mc){

1046

void* mc){

1679

1047

if(r == NULL){

1680

1048

return;

1681

1049

}

1684

1052

timed out */

1685

1053

1686

1054

if(quit_now){

1687

avahi_s_service_resolver_free(r);

1688

1055

return;

1689

1056

}

1690

1057

1735

1102

const char *domain,

1736

1103

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1737

1104

flags,

1738

void *mc){

1105

void* mc){

1739

1106

if(b == NULL){

1740

1107

return;

1741

1108

}

1801

1168

errno = old_errno;

1802

1169

}

1803

1170

1804

__attribute__((nonnull, warn_unused_result))

1805

1171

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

1806

1172

int ret;

1807

int old_errno;

1173

error_t ret_errno;

1808

1174

1809

1175

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

1810

1176

if(s < 0){

1811

old_errno = errno;

1177

ret_errno = errno;

1812

1178

perror_plus("socket");

1813

errno = old_errno;

1179

errno = ret_errno;

1814

1180

return false;

1815

1181

}

1816

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

1817

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

1182

strcpy(ifr->ifr_name, ifname);

1818

1183

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1819

1184

if(ret == -1){

1820

1185

if(debug){

1821

old_errno = errno;

1186

ret_errno = errno;

1822

1187

perror_plus("ioctl SIOCGIFFLAGS");

1823

errno = old_errno;

1824

}

1825

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

1826

old_errno = errno;

1827

perror_plus("close");

1828

errno = old_errno;

1188

errno = ret_errno;

1829

1189

}

1830

1190

return false;

1831

1191

}

1832

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

1833

old_errno = errno;

1834

perror_plus("close");

1835

errno = old_errno;

1836

}

1837

1192

return true;

1838

1193

}

1839

1194

1840

__attribute__((nonnull, warn_unused_result))

1841

1195

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

1842

1196

1843

1197

/* Reject the loopback device */

1885

1239

* corresponds to an acceptable network device.

1886

1240

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

1887

1241

*/

1888

__attribute__((nonnull, warn_unused_result))

1889

1242

int good_interface(const struct dirent *if_entry){

1890

1243

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

1891

1244

return 0;

1909

1262

/*

1910

1263

* This function determines if a network interface is up.

1911

1264

*/

1912

__attribute__((nonnull, warn_unused_result))

1913

1265

bool interface_is_up(const char *interface){

1914

1266

struct ifreq ifr;

1915

1267

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

1926

1278

/*

1927

1279

* This function determines if a network interface is running

1928

1280

*/

1929

__attribute__((nonnull, warn_unused_result))

1930

1281

bool interface_is_running(const char *interface){

1931

1282

struct ifreq ifr;

1932

1283

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

1940

1291

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

1941

1292

}

1942

1293

1943

__attribute__((nonnull, pure, warn_unused_result))

1944

1294

int notdotentries(const struct dirent *direntry){

1945

1295

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

1946

1296

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

1953

1303

}

1954

1304

1955

1305

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

1956

__attribute__((nonnull, warn_unused_result))

1957

1306

int runnable_hook(const struct dirent *direntry){

1958

1307

int ret;

1959

1308

size_t sret;

1967

1316

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

1968

1317

"abcdefghijklmnopqrstuvwxyz"

1969

1318

"0123456789"

1970

"_.-");

1319

"_-");

1971

1320

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

1972

1321

/* Contains non-allowed characters */

1973

1322

if(debug){

1977

1326

return 0;

1978

1327

}

1979

1328

1980

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

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);

1981

1337

if(ret == -1){

1982

1338

if(debug){

1983

1339

perror_plus("Could not stat hook");

2007

1363

return 1;

2008

1364

}

2009

1365

2010

__attribute__((nonnull, warn_unused_result))

2011

1366

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

2012

1367

mandos_context *mc){

2013

1368

int ret;

2017

1372

2018

1373

while(true){

2019

1374

if(mc->current_server == NULL){

2020

if(debug){

1375

if (debug){

2021

1376

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

2022

1377

" No timeout!\n");

2023

1378

}

2024

1379

ret = avahi_simple_poll_iterate(s, -1);

2025

1380

} else {

2026

if(debug){

1381

if (debug){

2027

1382

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

2028

1383

" it, or wait\n");

2029

1384

}

2046

1401

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

2047

1402

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

2048

1403

2049

if(debug){

1404

if (debug){

2050

1405

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

2051

1406

block_time);

2052

1407

}

2074

1429

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

2075

1430

}

2076

1431

if(ret != 0){

2077

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

1432

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

2078

1433

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

2079

1434

}

2080

1435

}

2081

1436

}

2082

1437

}

2083

1438

2084

__attribute__((nonnull))

2085

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

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,

2086

1492

const float delay){

2087

struct dirent **direntries = NULL;

2088

if(hookdir_fd == -1){

2089

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

2090

| O_CLOEXEC);

2091

if(hookdir_fd == -1){

2092

if(errno == ENOENT){

2093

if(debug){

2094

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

2095

" found\n", hookdir);

2096

}

2097

} else {

2098

perror_plus("open");

2099

}

2100

return;

2101

}

2102

}

2103

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

2104

if(devnull == -1){

2105

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

2106

return;

2107

}

2108

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

2109

runnable_hook, alphasort);

1493

struct dirent **direntries;

1494

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

1495

alphasort);

2110

1496

if(numhooks == -1){

2111

perror_plus("scandir");

2112

close(devnull);

2113

return;

2114

}

2115

struct dirent *direntry;

2116

int ret;

2117

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

2118

direntry = direntries[i];

2119

if(debug){

2120

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

2121

direntry->d_name);

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");

2122

1504

}

2123

pid_t hook_pid = fork();

2124

if(hook_pid == 0){

2125

/* Child */

2126

/* Raise privileges */

2127

errno = raise_privileges_permanently();

2128

if(errno != 0){

2129

perror_plus("Failed to raise privileges");

2130

_exit(EX_NOPERM);

2131

}

2132

/* Set group */

2133

errno = 0;

2134

ret = setgid(0);

2135

if(ret == -1){

2136

perror_plus("setgid");

2137

_exit(EX_NOPERM);

2138

}

2139

/* Reset supplementary groups */

2140

errno = 0;

2141

ret = setgroups(0, NULL);

2142

if(ret == -1){

2143

perror_plus("setgroups");

2144

_exit(EX_NOPERM);

2145

}

2146

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

2147

if(ret == -1){

2148

perror_plus("setenv");

2149

_exit(EX_OSERR);

2150

}

2151

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

2152

if(ret == -1){

2153

perror_plus("setenv");

2154

_exit(EX_OSERR);

2155

}

2156

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

2157

if(ret == -1){

2158

perror_plus("setenv");

2159

_exit(EX_OSERR);

2160

}

2161

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

2162

if(ret == -1){

2163

perror_plus("setenv");

2164

_exit(EX_OSERR);

2165

}

2166

char *delaystring;

2167

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

2168

if(ret == -1){

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){

2169

1514

perror_plus("asprintf");

2170

_exit(EX_OSERR);

2171

}

2172

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

2173

if(ret == -1){

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

}

2174

1573

free(delaystring);

2175

perror_plus("setenv");

2176

_exit(EX_OSERR);

2177

}

2178

free(delaystring);

2179

if(connect_to != NULL){

2180

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

2181

if(ret == -1){

2182

perror_plus("setenv");

2183

_exit(EX_OSERR);

2184

}

2185

}

2186

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

2187

direntry->d_name,

2188

O_RDONLY));

2189

if(hook_fd == -1){

2190

perror_plus("openat");

2191

_exit(EXIT_FAILURE);

2192

}

2193

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

2194

perror_plus("close");

2195

_exit(EXIT_FAILURE);

2196

}

2197

ret = dup2(devnull, STDIN_FILENO);

2198

if(ret == -1){

2199

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

2200

_exit(EX_OSERR);

2201

}

2202

ret = close(devnull);

2203

if(ret == -1){

2204

perror_plus("close");

2205

_exit(EX_OSERR);

2206

}

2207

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2208

if(ret == -1){

2209

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

2210

_exit(EX_OSERR);

2211

}

2212

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

2213

environ) == -1){

2214

perror_plus("fexecve");

2215

_exit(EXIT_FAILURE);

2216

}

2217

} else {

2218

if(hook_pid == -1){

2219

perror_plus("fork");

2220

free(direntry);

2221

continue;

2222

}

2223

int status;

2224

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

2225

perror_plus("waitpid");

2226

free(direntry);

2227

continue;

2228

}

2229

if(WIFEXITED(status)){

2230

if(WEXITSTATUS(status) != 0){

2231

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

2232

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

2233

WEXITSTATUS(status));

2234

free(direntry);

2235

continue;

2236

}

2237

} else if(WIFSIGNALED(status)){

2238

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

2239

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

2240

WTERMSIG(status));

2241

free(direntry);

2242

continue;

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

}

2243

1585

} else {

2244

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

2245

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

2246

free(direntry);

2247

continue;

2248

}

2249

}

2250

if(debug){

2251

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

2252

direntry->d_name);

2253

}

2254

free(direntry);

2255

}

2256

free(direntries);

2257

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

2258

perror_plus("close");

2259

} else {

2260

hookdir_fd = -1;

2261

}

2262

close(devnull);

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;

2263

1622

}

2264

1623

2265

__attribute__((nonnull, warn_unused_result))

2266

int bring_up_interface(const char *const interface,

2267

const float delay){

2268

int old_errno = errno;

2269

int ret;

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;

2270

1630

struct ifreq network;

2271

1631

unsigned int if_index = if_nametoindex(interface);

2272

1632

if(if_index == 0){

2281

1641

}

2282

1642

2283

1643

if(not interface_is_up(interface)){

2284

int ret_errno = 0;

2285

int ioctl_errno = 0;

2286

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

1644

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

2287

1645

ret_errno = errno;

2288

1646

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

2289

1647

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

2290

errno = old_errno;

2291

1648

return ret_errno;

2292

1649

}

2293

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

1650

network.ifr_flags |= IFF_UP;

2294

1651

2295

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

2296

if(sd == -1){

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

2297

1654

ret_errno = errno;

2298

1655

perror_plus("socket");

2299

1656

errno = old_errno;

2300

1657

return ret_errno;

2301

1658

}

2302

1659

2303

1660

if(quit_now){

2304

ret = close(sd);

2305

if(ret == -1){

2306

perror_plus("close");

2307

}

1661

close(sd);

2308

1662

errno = old_errno;

2309

1663

return EINTR;

2310

1664

}

2314

1668

interface);

2315

1669

}

2316

1670

2317

/* Raise privileges */

2318

ret_errno = raise_privileges();

2319

if(ret_errno != 0){

2320

errno = ret_errno;

2321

perror_plus("Failed to raise privileges");

2322

}

1671

/* Raise priviliges */

1672

raise_privileges();

2323

1673

2324

1674

#ifdef __linux__

2325

int ret_linux;

2326

bool restore_loglevel = false;

2327

if(ret_errno == 0){

2328

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2329

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

2330

ret_linux = klogctl(8, NULL, 5);

2331

if(ret_linux == -1){

2332

perror_plus("klogctl");

2333

} else {

2334

restore_loglevel = true;

2335

}

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");

2336

1682

}

2337

1683

#endif /* __linux__ */

2338

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

2339

ioctl_errno = errno;

1684

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

1685

ret_errno = errno;

2340

1686

#ifdef __linux__

2341

1687

if(restore_loglevel){

2342

1688

ret_linux = klogctl(7, NULL, 0);

2346

1692

}

2347

1693

#endif /* __linux__ */

2348

1694

2349

/* If raise_privileges() succeeded above */

2350

if(ret_errno == 0){

2351

/* Lower privileges */

2352

ret_errno = lower_privileges();

2353

if(ret_errno != 0){

2354

errno = ret_errno;

2355

perror_plus("Failed to lower privileges");

2356

}

2357

}

1695

/* Lower privileges */

1696

lower_privileges();

2358

1697

2359

1698

/* Close the socket */

2360

ret = close(sd);

1699

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

2361

1700

if(ret == -1){

2362

1701

perror_plus("close");

2363

1702

}

2364

1703

2365

1704

if(ret_setflags == -1){

2366

errno = ioctl_errno;

1705

errno = ret_errno;

2367

1706

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2368

1707

errno = old_errno;

2369

return ioctl_errno;

1708

return ret_errno;

2370

1709

}

2371

1710

} else if(debug){

2372

1711

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

2375

1714

2376

1715

/* Sleep checking until interface is running.

2377

1716

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

2378

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

1717

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

2379

1718

if(interface_is_running(interface)){

2380

1719

break;

2381

1720

}

2390

1729

return 0;

2391

1730

}

2392

1731

2393

__attribute__((nonnull, warn_unused_result))

2394

int take_down_interface(const char *const interface){

2395

int old_errno = errno;

1732

error_t take_down_interface(const char *const interface){

1733

error_t old_errno = errno;

2396

1734

struct ifreq network;

2397

1735

unsigned int if_index = if_nametoindex(interface);

2398

1736

if(if_index == 0){

2401

1739

return ENXIO;

2402

1740

}

2403

1741

if(interface_is_up(interface)){

2404

int ret_errno = 0;

2405

int ioctl_errno = 0;

1742

error_t ret_errno = 0;

2406

1743

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

2407

1744

ret_errno = errno;

2408

1745

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

2409

1746

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

2410

errno = old_errno;

2411

1747

return ret_errno;

2412

1748

}

2413

1749

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

2414

1750

2415

1751

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

2416

if(sd == -1){

1752

if(sd < 0){

2417

1753

ret_errno = errno;

2418

1754

perror_plus("socket");

2419

1755

errno = old_errno;

2425

1761

interface);

2426

1762

}

2427

1763

2428

/* Raise privileges */

2429

ret_errno = raise_privileges();

2430

if(ret_errno != 0){

2431

errno = ret_errno;

2432

perror_plus("Failed to raise privileges");

2433

}

1764

/* Raise priviliges */

1765

raise_privileges();

2434

1766

2435

1767

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

2436

ioctl_errno = errno;

1768

ret_errno = errno;

2437

1769

2438

/* If raise_privileges() succeeded above */

2439

if(ret_errno == 0){

2440

/* Lower privileges */

2441

ret_errno = lower_privileges();

2442

if(ret_errno != 0){

2443

errno = ret_errno;

2444

perror_plus("Failed to lower privileges");

2445

}

2446

}

1770

/* Lower privileges */

1771

lower_privileges();

2447

1772

2448

1773

/* Close the socket */

2449

int ret = close(sd);

1774

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

2450

1775

if(ret == -1){

2451

1776

perror_plus("close");

2452

1777

}

2453

1778

2454

1779

if(ret_setflags == -1){

2455

errno = ioctl_errno;

1780

errno = ret_errno;

2456

1781

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2457

1782

errno = old_errno;

2458

return ioctl_errno;

1783

return ret_errno;

2459

1784

}

2460

1785

} else if(debug){

2461

1786

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

2467

1792

}

2468

1793

2469

1794

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

2470

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

2471

#if GNUTLS_VERSION_NUMBER >= 0x030606

2472

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

2473

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

2474

":%PROFILE_ULTRA",

2475

#elif GNUTLS_VERSION_NUMBER < 0x030600

2476

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

2477

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

2478

#else

2479

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

2480

#endif

2481

.current_server = NULL, .interfaces = NULL,

2482

.interfaces_size = 0 };

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 };

2483

1799

AvahiSServiceBrowser *sb = NULL;

2484

1800

error_t ret_errno;

2485

1801

int ret;

2488

1804

int exitcode = EXIT_SUCCESS;

2489

1805

char *interfaces_to_take_down = NULL;

2490

1806

size_t interfaces_to_take_down_size = 0;

2491

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

2492

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

2493

char *tempdir = NULL;

1807

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

1808

bool tempdir_created = false;

2494

1809

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2495

1810

const char *seckey = PATHDIR "/" SECKEY;

2496

1811

const char *pubkey = PATHDIR "/" PUBKEY;

2497

#if GNUTLS_VERSION_NUMBER >= 0x030606

2498

const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;

2499

const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;

2500

#endif

2501

const char *dh_params_file = NULL;

2502

1812

char *interfaces_hooks = NULL;

2503

1813

2504

1814

bool gnutls_initialized = false;

2551

1861

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

2552

1862

.arg = "FILE",

2553

1863

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

2554

.group = 1 },

2555

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

2556

.arg = "FILE",

2557

#if GNUTLS_VERSION_NUMBER >= 0x030606

2558

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

2559

#else

2560

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

2561

#endif

2562

.group = 1 },

2563

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

2564

.arg = "FILE",

2565

#if GNUTLS_VERSION_NUMBER >= 0x030606

2566

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

2567

#else

2568

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

2569

#endif

2570

.group = 1 },

1864

.group = 2 },

2571

1865

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

2572

1866

.arg = "BITS",

2573

1867

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

2574

1868

" Diffie-Hellman key exchange",

2575

1869

.group = 2 },

2576

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

2577

.arg = "FILE",

2578

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

2579

" for the Diffie-Hellman key exchange",

2580

.group = 2 },

2581

1870

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

2582

1871

.arg = "STRING",

2583

1872

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

2629

1918

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

2630

1919

pubkey = arg;

2631

1920

break;

2632

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

2633

#if GNUTLS_VERSION_NUMBER >= 0x030606

2634

tls_privkey = arg;

2635

#endif

2636

break;

2637

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

2638

#if GNUTLS_VERSION_NUMBER >= 0x030606

2639

tls_pubkey = arg;

2640

#endif

2641

break;

2642

1921

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

2643

1922

errno = 0;

2644

1923

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

2648

1927

}

2649

1928

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

2650

1929

break;

2651

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

2652

dh_params_file = arg;

2653

break;

2654

1930

case 130: /* --priority */

2655

1931

mc.priority = arg;

2656

1932

break;

2679

1955

argp_state_help(state, state->out_stream,

2680

1956

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

2681

1957

& ~(unsigned int)ARGP_HELP_EXIT_OK);

2682

__builtin_unreachable();

2683

1958

case -3: /* --usage */

2684

1959

argp_state_help(state, state->out_stream,

2685

1960

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2686

__builtin_unreachable();

2687

1961

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

2688

1962

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

2689

1963

exit(argp_err_exit_status);

2698

1972

.args_doc = "",

2699

1973

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

2700

1974

" passwords from a Mandos server" };

2701

ret_errno = argp_parse(&argp, argc, argv,

2702

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2703

switch(ret_errno){

1975

ret = argp_parse(&argp, argc, argv,

1976

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1977

switch(ret){

2704

1978

case 0:

2705

1979

break;

2706

1980

case ENOMEM:

2707

1981

default:

2708

errno = ret_errno;

1982

errno = ret;

2709

1983

perror_plus("argp_parse");

2710

1984

exitcode = EX_OSERR;

2711

1985

goto end;

2714

1988

goto end;

2715

1989

}

2716

1990

}

2717

1991

2718

1992

{

2719

1993

/* Work around Debian bug #633582:

2720

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

1994

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

2721

1995

2722

/* Re-raise privileges */

2723

ret = raise_privileges();

2724

if(ret != 0){

2725

errno = ret;

2726

perror_plus("Failed to raise privileges");

2727

} else {

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2728

1998

struct stat st;

2729

1999

2730

2000

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

2744

2014

}

2745

2015

}

2746

2016

}

2747

close(seckey_fd);

2017

TEMP_FAILURE_RETRY(close(seckey_fd));

2748

2018

}

2749

2019

}

2750

2020

2751

2021

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

2752

2022

int pubkey_fd = open(pubkey, O_RDONLY);

2753

2023

if(pubkey_fd == -1){

2765

2035

}

2766

2036

}

2767

2037

}

2768

close(pubkey_fd);

2769

}

2770

}

2771

2772

if(dh_params_file != NULL

2773

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

2774

int dhparams_fd = open(dh_params_file, O_RDONLY);

2775

if(dhparams_fd == -1){

2776

perror_plus("open");

2777

} else {

2778

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

2779

if(ret == -1){

2780

perror_plus("fstat");

2781

} else {

2782

if(S_ISREG(st.st_mode)

2783

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

2784

ret = fchown(dhparams_fd, uid, gid);

2785

if(ret == -1){

2786

perror_plus("fchown");

2787

}

2788

}

2789

}

2790

close(dhparams_fd);

2791

}

2792

}

2793

2038

TEMP_FAILURE_RETRY(close(pubkey_fd));

2039

}

2040

}

2041

2794

2042

/* Lower privileges */

2795

ret = lower_privileges();

2796

if(ret != 0){

2797

errno = ret;

2798

perror_plus("Failed to lower privileges");

2799

}

2043

lower_privileges();

2800

2044

}

2801

2045

}

2802

2046

2828

2072

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

2829

2073

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

2830

2074

}

2831

run_network_hooks("start", interfaces_hooks != NULL ?

2832

interfaces_hooks : "", delay);

2075

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

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

2833

2079

}

2834

2080

2835

2081

if(not debug){

2913

2159

2914

2160

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

2915

2161

if(mc.interfaces == NULL){

2916

struct dirent **direntries = NULL;

2162

struct dirent **direntries;

2917

2163

/* Look for any good interfaces */

2918

2164

ret = scandir(sys_class_net, &direntries, good_interface,

2919

2165

alphasort);

2925

2171

if(ret_errno != 0){

2926

2172

errno = ret_errno;

2927

2173

perror_plus("argz_add");

2928

free(direntries[i]);

2929

2174

continue;

2930

2175

}

2931

2176

if(debug){

2932

2177

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

2933

2178

direntries[i]->d_name);

2934

2179

}

2935

free(direntries[i]);

2936

2180

}

2937

2181

free(direntries);

2938

2182

} else {

2939

if(ret == 0){

2940

free(direntries);

2941

}

2183

free(direntries);

2942

2184

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

2943

2185

exitcode = EXIT_FAILURE;

2944

2186

goto end;

2967

2209

break;

2968

2210

}

2969

2211

bool interface_was_up = interface_is_up(interface);

2970

errno = bring_up_interface(interface, delay);

2212

ret = bring_up_interface(interface, delay);

2971

2213

if(not interface_was_up){

2972

if(errno != 0){

2973

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

2974

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

2214

if(ret != 0){

2215

errno = ret;

2216

perror_plus("Failed to bring up interface");

2975

2217

} else {

2976

errno = argz_add(&interfaces_to_take_down,

2977

&interfaces_to_take_down_size,

2978

interface);

2979

if(errno != 0){

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;

2980

2223

perror_plus("argz_add");

2981

2224

}

2982

2225

}

3000

2243

goto end;

3001

2244

}

3002

2245

3003

#if GNUTLS_VERSION_NUMBER >= 0x030606

3004

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

3005

#elif GNUTLS_VERSION_NUMBER < 0x030600

3006

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

3007

#else

3008

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

3009

#endif

2246

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

3010

2247

if(ret == -1){

3011

2248

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

3012

2249

exitcode = EX_UNAVAILABLE;

3019

2256

goto end;

3020

2257

}

3021

2258

3022

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

3023

tempdir = mkdtemp(run_tempdir);

3024

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

3025

if(debug){

3026

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

3027

run_tempdir, old_tempdir);

3028

}

3029

tempdir = mkdtemp(old_tempdir);

3030

}

3031

if(tempdir == NULL){

2259

if(mkdtemp(tempdir) == NULL){

3032

2260

perror_plus("mkdtemp");

3033

2261

goto end;

3034

2262

}

2263

tempdir_created = true;

3035

2264

3036

2265

if(quit_now){

3037

2266

goto end;

3112

2341

sleep((unsigned int)retry_interval);

3113

2342

}

3114

2343

3115

if(not quit_now){

2344

if (not quit_now){

3116

2345

exitcode = EXIT_SUCCESS;

3117

2346

}

3118

2347

3134

2363

3135

2364

/* Allocate a new server */

3136

2365

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

3137

&config, NULL, NULL, &ret);

2366

&config, NULL, NULL, &ret_errno);

3138

2367

3139

2368

/* Free the Avahi configuration data */

3140

2369

avahi_server_config_free(&config);

3143

2372

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

3144

2373

if(mc.server == NULL){

3145

2374

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

3146

avahi_strerror(ret));

2375

avahi_strerror(ret_errno));

3147

2376

exitcode = EX_UNAVAILABLE;

3148

2377

goto end;

3149

2378

}

3173

2402

if(debug){

3174

2403

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

3175

2404

}

3176

2405

3177

2406

ret = avahi_loop_with_timeout(simple_poll,

3178

2407

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

3179

2408

if(debug){

3184

2413

end:

3185

2414

3186

2415

if(debug){

3187

if(signal_received){

3188

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

3189

argv[0], signal_received,

3190

strsignal(signal_received));

3191

} else {

3192

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

3193

}

2416

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

3194

2417

}

3195

2418

3196

2419

/* Cleanup things */

3207

2430

3208

2431

if(gnutls_initialized){

3209

2432

gnutls_certificate_free_credentials(mc.cred);

2433

gnutls_global_deinit();

3210

2434

gnutls_dh_params_deinit(mc.dh_params);

3211

2435

}

3212

2436

3220

2444

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

3221

2445

while(mc.current_server != NULL){

3222

2446

server *next = mc.current_server->next;

3223

#ifdef __GNUC__

3224

#pragma GCC diagnostic push

3225

#pragma GCC diagnostic ignored "-Wcast-qual"

3226

#endif

3227

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

3228

#ifdef __GNUC__

3229

#pragma GCC diagnostic pop

3230

#endif

3231

2447

free(mc.current_server);

3232

2448

mc.current_server = next;

3233

2449

}

3234

2450

}

3235

2451

3236

/* Re-raise privileges */

2452

/* Re-raise priviliges */

3237

2453

{

3238

ret = raise_privileges();

3239

if(ret != 0){

3240

errno = ret;

3241

perror_plus("Failed to raise privileges");

3242

} else {

3243

3244

/* Run network hooks */

3245

run_network_hooks("stop", interfaces_hooks != NULL ?

3246

interfaces_hooks : "", delay);

3247

3248

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

3249

{

3250

char *interface = NULL;

3251

while((interface = argz_next(interfaces_to_take_down,

3252

interfaces_to_take_down_size,

3253

interface))){

3254

ret = take_down_interface(interface);

3255

if(ret != 0){

3256

errno = ret;

3257

perror_plus("Failed to take down interface");

3258

}

3259

}

3260

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

3261

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

3262

" down\n");

3263

}

3264

}

3265

}

3266

3267

ret = lower_privileges_permanently();

3268

if(ret != 0){

3269

errno = ret;

3270

perror_plus("Failed to lower privileges permanently");

3271

}

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();

3272

2479

}

3273

2480

3274

2481

free(interfaces_to_take_down);

3275

2482

free(interfaces_hooks);

3276

2483

3277

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

3278

uintmax_t level){

2484

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

2485

if(tempdir_created){

3279

2486

struct dirent **direntries = NULL;

3280

int dret;

3281

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

3282

O_RDONLY

3283

| O_NOFOLLOW

3284

| O_DIRECTORY

3285

| O_PATH));

3286

if(dir_fd == -1){

3287

perror_plus("open");

3288

return;

3289

}

3290

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

3291

notdotentries, alphasort);

3292

if(numentries >= 0){

2487

struct dirent *direntry = NULL;

2488

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

2489

alphasort);

2490

if (numentries > 0){

3293

2491

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

3294

if(debug){

3295

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

3296

dirname, direntries[i]->d_name);

3297

}

3298

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

3299

if(dret == -1){

3300

if(errno == EISDIR){

3301

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

3302

AT_REMOVEDIR);

3303

}

3304

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

3305

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

3306

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

3307

/* Recurse only in this special case */

3308

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

3309

dret = 0;

3310

}

3311

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

3312

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

3313

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

3314

}

3315

}

3316

free(direntries[i]);

3317

}

3318

3319

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

3320

free(direntries);

3321

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3322

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

3323

perror_plus("rmdir");

3324

}

3325

} else {

3326

perror_plus("scandirat");

3327

}

3328

close(dir_fd);

3329

}

3330

3331

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

3332

if(tempdir != NULL){

3333

clean_dir_at(-1, tempdir, 0);

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

}

3334

2518

}

3335

2519

3336

2520

if(quit_now){