/mandos/release : revision 237.7.495

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

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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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opendir(), DIR */

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#include <sys/stat.h> /* open(), S_ISREG */

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

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inet_pton(), connect() */

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

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inet_pton(), connect(),

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getnameinfo() */

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

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

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64

*/

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

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strtoimax() */

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

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

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

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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program_invocation_short_name */

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

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

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*/

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

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

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

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

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

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unlinkat() */

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

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#include <iso646.h> /* not, or, and */

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

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argp_state, struct argp,

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#include <sys/wait.h> /* waitpid(), WIFEXITED(),

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WEXITSTATUS(), WTERMSIG() */

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#include <grp.h> /* setgroups() */

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#include <argz.h> /* argz_add_sep(), argz_next(),

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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fprintf(stderr, "Mandos plugin %s: ",

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program_invocation_short_name);

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errno = e;

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

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va_list ap;

180

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va_start (ap, format);

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

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program_invocation_short_name));

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

201

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

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}

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/*

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

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* "buffer_length" is how much is already used.

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*/

209

__attribute__((nonnull, warn_unused_result))

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

194

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(buffer == NULL){

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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223

}

201

224

return buffer_capacity;

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225

}

203

226

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

205

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

206

int af){

228

__attribute__((nonnull, warn_unused_result))

229

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

230

int af, server **current_server){

207

231

int ret;

208

232

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

209

233

if(new_server == NULL){

210

234

perror_plus("malloc");

211

return -1;

235

return false;

212

236

}

213

237

*new_server = (server){ .ip = strdup(ip),

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.port = port,

216

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.af = af };

217

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if(new_server->ip == NULL){

218

242

perror_plus("strdup");

219

return -1;

243

free(new_server);

244

return false;

245

}

246

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

247

if(ret == -1){

248

perror_plus("clock_gettime");

249

#ifdef __GNUC__

250

#pragma GCC diagnostic push

251

#pragma GCC diagnostic ignored "-Wcast-qual"

252

#endif

253

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

254

#ifdef __GNUC__

255

#pragma GCC diagnostic pop

256

#endif

257

free(new_server);

258

return false;

220

259

}

221

260

/* Special case of first server */

222

if (mc.current_server == NULL){

261

if(*current_server == NULL){

223

262

new_server->next = new_server;

224

263

new_server->prev = new_server;

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mc.current_server = new_server;

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

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*current_server = new_server;

227

265

} else {

228

new_server->next = mc.current_server;

229

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

266

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

267

new_server->next = *current_server;

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

230

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new_server->prev->next = new_server;

231

mc.current_server->prev = new_server;

232

}

233

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

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if(ret == -1){

235

perror_plus("clock_gettime");

236

return -1;

237

}

238

return 0;

270

(*current_server)->prev = new_server;

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}

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return true;

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273

}

240

274

241

275

/*

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* Initialize GPGME.

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*/

244

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

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const char *tempdir){

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__attribute__((nonnull, warn_unused_result))

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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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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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250

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/*

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

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*/

253

bool import_key(const char *filename){

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bool import_key(const char * const filename){

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290

int ret;

255

291

int fd;

256

292

gpgme_data_t pgp_data;

268

304

return false;

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}

270

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rc = gpgme_op_import(mc.ctx, pgp_data);

307

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

272

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if(rc != GPG_ERR_NO_ERROR){

273

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

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gpgme_strsource(rc), gpgme_strerror(rc));

275

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return false;

276

312

}

313

{

314

gpgme_import_result_t import_result

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= gpgme_op_import_result(mc->ctx);

316

if((import_result->imported < 1

317

or import_result->not_imported > 0)

318

and import_result->unchanged == 0){

319

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

320

fprintf_plus(stderr,

321

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

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import_result->considered);

323

fprintf_plus(stderr,

324

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

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import_result->no_user_id);

326

fprintf_plus(stderr,

327

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

328

import_result->imported);

329

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

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import_result->imported_rsa);

331

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

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import_result->unchanged);

333

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

334

import_result->new_user_ids);

335

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

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import_result->new_sub_keys);

337

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

338

import_result->new_signatures);

339

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

340

import_result->new_revocations);

341

fprintf_plus(stderr,

342

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

343

import_result->secret_read);

344

fprintf_plus(stderr,

345

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

346

import_result->secret_imported);

347

fprintf_plus(stderr,

348

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

349

import_result->secret_unchanged);

350

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

351

import_result->not_imported);

352

for(gpgme_import_status_t import_status

353

= import_result->imports;

354

import_status != NULL;

355

import_status = import_status->next){

356

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

357

import_status->fpr);

358

if(import_status->result != GPG_ERR_NO_ERROR){

359

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

360

gpgme_strsource(import_status->result),

361

gpgme_strerror(import_status->result));

362

}

363

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

364

fprintf_plus(stderr,

365

import_status->status & GPGME_IMPORT_NEW

366

? "The key was new.\n"

367

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

368

fprintf_plus(stderr,

369

import_status->status & GPGME_IMPORT_UID

370

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

371

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

372

fprintf_plus(stderr,

373

import_status->status & GPGME_IMPORT_SIG

374

? "The key contained new signatures.\n"

375

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

376

fprintf_plus(stderr,

377

import_status->status & GPGME_IMPORT_SUBKEY

378

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

379

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

380

fprintf_plus(stderr,

381

import_status->status & GPGME_IMPORT_SECRET

382

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

383

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

384

}

385

return false;

386

}

387

}

277

388

278

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

389

ret = close(fd);

279

390

if(ret == -1){

280

391

perror_plus("close");

281

392

}

318

429

}

319

430

320

431

/* Create new GPGME "context" */

321

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

432

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

322

433

if(rc != GPG_ERR_NO_ERROR){

323

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

324

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

325

gpgme_strerror(rc));

434

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

435

gpgme_strsource(rc), gpgme_strerror(rc));

326

436

return false;

327

437

}

328

438

337

447

* Decrypt OpenPGP data.

338

448

* Returns -1 on error

339

449

*/

450

__attribute__((nonnull, warn_unused_result))

340

451

static ssize_t pgp_packet_decrypt(const char *cryptotext,

341

452

size_t crypto_size,

342

char **plaintext){

453

char **plaintext,

454

mandos_context *mc){

343

455

gpgme_data_t dh_crypto, dh_plain;

344

456

gpgme_error_t rc;

345

457

ssize_t ret;

362

474

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

363

475

rc = gpgme_data_new(&dh_plain);

364

476

if(rc != GPG_ERR_NO_ERROR){

365

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

366

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

477

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

367

478

gpgme_strsource(rc), gpgme_strerror(rc));

368

479

gpgme_data_release(dh_crypto);

369

480

return -1;

371

482

372

483

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

373

484

data buffer */

374

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

485

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

375

486

if(rc != GPG_ERR_NO_ERROR){

376

487

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

377

488

gpgme_strsource(rc), gpgme_strerror(rc));

378

489

plaintext_length = -1;

379

490

if(debug){

380

491

gpgme_decrypt_result_t result;

381

result = gpgme_op_decrypt_result(mc.ctx);

492

result = gpgme_op_decrypt_result(mc->ctx);

382

493

if(result == NULL){

383

494

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

384

495

} else {

385

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

386

result->unsupported_algorithm);

387

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

388

result->wrong_key_usage);

496

if(result->unsupported_algorithm != NULL) {

497

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

498

result->unsupported_algorithm);

499

}

500

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

501

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

389

502

if(result->file_name != NULL){

390

503

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

391

504

}

461

574

return plaintext_length;

462

575

}

463

576

464

static const char * safer_gnutls_strerror(int value){

465

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

466

-Wunreachable-code */

467

if(ret == NULL)

468

ret = "(unknown)";

469

return ret;

577

__attribute__((warn_unused_result, const))

578

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

579

if(str == NULL)

580

return "(unknown)";

581

return str;

582

}

583

584

__attribute__((warn_unused_result))

585

static const char *safer_gnutls_strerror(int value){

586

const char *ret = gnutls_strerror(value);

587

return safe_string(ret);

470

588

}

471

589

472

590

/* GnuTLS log function callback */

591

__attribute__((nonnull))

473

592

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

474

593

const char* string){

475

594

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

476

595

}

477

596

597

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

478

598

static int init_gnutls_global(const char *pubkeyfilename,

479

const char *seckeyfilename){

599

const char *seckeyfilename,

600

const char *dhparamsfilename,

601

mandos_context *mc){

480

602

int ret;

603

unsigned int uret;

481

604

482

605

if(debug){

483

606

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

484

607

}

485

608

486

ret = gnutls_global_init();

487

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

490

return -1;

491

}

492

493

609

if(debug){

494

610

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

495

611

* - GnuTLS manual

499

615

}

500

616

501

617

/* OpenPGP credentials */

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

618

ret = gnutls_certificate_allocate_credentials(&mc->cred);

503

619

if(ret != GNUTLS_E_SUCCESS){

504

620

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

505

621

safer_gnutls_strerror(ret));

506

gnutls_global_deinit();

507

622

return -1;

508

623

}

509

624

515

630

}

516

631

517

632

ret = gnutls_certificate_set_openpgp_key_file

518

(mc.cred, pubkeyfilename, seckeyfilename,

633

(mc->cred, pubkeyfilename, seckeyfilename,

519

634

GNUTLS_OPENPGP_FMT_BASE64);

520

635

if(ret != GNUTLS_E_SUCCESS){

521

636

fprintf_plus(stderr,

527

642

}

528

643

529

644

/* GnuTLS server initialization */

530

ret = gnutls_dh_params_init(&mc.dh_params);

645

ret = gnutls_dh_params_init(&mc->dh_params);

531

646

if(ret != GNUTLS_E_SUCCESS){

532

647

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

648

" initialization: %s\n",

534

649

safer_gnutls_strerror(ret));

535

650

goto globalfail;

536

651

}

537

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

538

if(ret != GNUTLS_E_SUCCESS){

539

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

540

safer_gnutls_strerror(ret));

541

goto globalfail;

542

}

543

544

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

652

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

653

if(dhparamsfilename != NULL){

654

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

655

do {

656

int dhpfile = open(dhparamsfilename, O_RDONLY);

657

if(dhpfile == -1){

658

perror_plus("open");

659

dhparamsfilename = NULL;

660

break;

661

}

662

size_t params_capacity = 0;

663

while(true){

664

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

665

(size_t)params.size,

666

(size_t)params_capacity);

667

if(params_capacity == 0){

668

perror_plus("incbuffer");

669

free(params.data);

670

params.data = NULL;

671

dhparamsfilename = NULL;

672

break;

673

}

674

ssize_t bytes_read = read(dhpfile,

675

params.data + params.size,

676

BUFFER_SIZE);

677

/* EOF */

678

if(bytes_read == 0){

679

break;

680

}

681

/* check bytes_read for failure */

682

if(bytes_read < 0){

683

perror_plus("read");

684

free(params.data);

685

params.data = NULL;

686

dhparamsfilename = NULL;

687

break;

688

}

689

params.size += (unsigned int)bytes_read;

690

}

691

ret = close(dhpfile);

692

if(ret == -1){

693

perror_plus("close");

694

}

695

if(params.data == NULL){

696

dhparamsfilename = NULL;

697

}

698

if(dhparamsfilename == NULL){

699

break;

700

}

701

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

702

GNUTLS_X509_FMT_PEM);

703

if(ret != GNUTLS_E_SUCCESS){

704

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

705

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

706

safer_gnutls_strerror(ret));

707

dhparamsfilename = NULL;

708

}

709

free(params.data);

710

} while(false);

711

}

712

if(dhparamsfilename == NULL){

713

if(mc->dh_bits == 0){

714

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

715

/* Try to read the private key file */

716

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

717

do {

718

int secfile = open(seckeyfilename, O_RDONLY);

719

if(secfile == -1){

720

perror_plus("open");

721

break;

722

}

723

size_t buffer_capacity = 0;

724

while(true){

725

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

726

(size_t)buffer.size,

727

(size_t)buffer_capacity);

728

if(buffer_capacity == 0){

729

perror_plus("incbuffer");

730

free(buffer.data);

731

buffer.data = NULL;

732

break;

733

}

734

ssize_t bytes_read = read(secfile,

735

buffer.data + buffer.size,

736

BUFFER_SIZE);

737

/* EOF */

738

if(bytes_read == 0){

739

break;

740

}

741

/* check bytes_read for failure */

742

if(bytes_read < 0){

743

perror_plus("read");

744

free(buffer.data);

745

buffer.data = NULL;

746

break;

747

}

748

buffer.size += (unsigned int)bytes_read;

749

}

750

close(secfile);

751

} while(false);

752

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

753

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

754

if(buffer.data != NULL){

755

{

756

gnutls_openpgp_privkey_t privkey = NULL;

757

ret = gnutls_openpgp_privkey_init(&privkey);

758

if(ret != GNUTLS_E_SUCCESS){

759

fprintf_plus(stderr, "Error initializing OpenPGP key"

760

" structure: %s",

761

safer_gnutls_strerror(ret));

762

free(buffer.data);

763

buffer.data = NULL;

764

} else {

765

ret = gnutls_openpgp_privkey_import

766

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

767

if(ret != GNUTLS_E_SUCCESS){

768

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

769

safer_gnutls_strerror(ret));

770

privkey = NULL;

771

}

772

free(buffer.data);

773

buffer.data = NULL;

774

if(privkey != NULL){

775

/* Use private key to suggest an appropriate

776

sec_param */

777

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

778

gnutls_openpgp_privkey_deinit(privkey);

779

if(debug){

780

fprintf_plus(stderr, "This OpenPGP key implies using"

781

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

782

safe_string(gnutls_sec_param_get_name

783

(sec_param)));

784

}

785

}

786

}

787

}

788

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

789

/* Err on the side of caution */

790

sec_param = GNUTLS_SEC_PARAM_ULTRA;

791

if(debug){

792

fprintf_plus(stderr, "Falling back to security parameter"

793

" \"%s\"\n",

794

safe_string(gnutls_sec_param_get_name

795

(sec_param)));

796

}

797

}

798

}

799

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

800

if(uret != 0){

801

mc->dh_bits = uret;

802

if(debug){

803

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

804

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

805

safe_string(gnutls_sec_param_get_name

806

(sec_param)),

807

mc->dh_bits);

808

}

809

} else {

810

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

811

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

812

safe_string(gnutls_sec_param_get_name

813

(sec_param)),

814

safer_gnutls_strerror(ret));

815

goto globalfail;

816

}

817

} else if(debug){

818

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

819

mc->dh_bits);

820

}

821

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

822

if(ret != GNUTLS_E_SUCCESS){

823

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

824

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

825

safer_gnutls_strerror(ret));

826

goto globalfail;

827

}

828

}

829

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

545

830

546

831

return 0;

547

832

548

833

globalfail:

549

834

550

gnutls_certificate_free_credentials(mc.cred);

551

gnutls_global_deinit();

552

gnutls_dh_params_deinit(mc.dh_params);

835

gnutls_certificate_free_credentials(mc->cred);

836

gnutls_dh_params_deinit(mc->dh_params);

553

837

return -1;

554

838

}

555

839

556

static int init_gnutls_session(gnutls_session_t *session){

840

__attribute__((nonnull, warn_unused_result))

841

static int init_gnutls_session(gnutls_session_t *session,

842

mandos_context *mc){

557

843

int ret;

558

844

/* GnuTLS session creation */

559

845

do {

571

857

{

572

858

const char *err;

573

859

do {

574

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

860

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

575

861

if(quit_now){

576

862

gnutls_deinit(*session);

577

863

return -1;

588

874

589

875

do {

590

876

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

591

mc.cred);

877

mc->cred);

592

878

if(quit_now){

593

879

gnutls_deinit(*session);

594

880

return -1;

604

890

/* ignore client certificate if any. */

605

891

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

606

892

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

608

609

893

return 0;

610

894

}

611

895

613

897

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

614

898

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

615

899

900

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

901

__attribute__((warn_unused_result))

902

int raise_privileges(void){

903

int old_errno = errno;

904

int ret = 0;

905

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

906

ret = errno;

907

}

908

errno = old_errno;

909

return ret;

910

}

911

912

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

913

__attribute__((warn_unused_result))

914

int raise_privileges_permanently(void){

915

int old_errno = errno;

916

int ret = raise_privileges();

917

if(ret != 0){

918

errno = old_errno;

919

return ret;

920

}

921

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

922

ret = errno;

923

}

924

errno = old_errno;

925

return ret;

926

}

927

928

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

929

__attribute__((warn_unused_result))

930

int lower_privileges(void){

931

int old_errno = errno;

932

int ret = 0;

933

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

934

ret = errno;

935

}

936

errno = old_errno;

937

return ret;

938

}

939

940

/* Lower privileges permanently */

941

__attribute__((warn_unused_result))

942

int lower_privileges_permanently(void){

943

int old_errno = errno;

944

int ret = 0;

945

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

946

ret = errno;

947

}

948

errno = old_errno;

949

return ret;

950

}

951

952

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

953

__attribute__((nonnull, warn_unused_result))

954

static bool add_delete_local_route(const bool add,

955

const char *address,

956

AvahiIfIndex if_index){

957

int ret;

958

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

959

char add_arg[] = "add";

960

char delete_arg[] = "delete";

961

char debug_flag[] = "--debug";

962

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

963

if(pluginhelperdir == NULL){

964

if(debug){

965

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

966

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

967

}

968

return false;

969

}

970

971

char interface[IF_NAMESIZE];

972

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

973

perror_plus("if_indextoname");

974

return false;

975

}

976

977

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

978

if(devnull == -1){

979

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

980

return false;

981

}

982

pid_t pid = fork();

983

if(pid == 0){

984

/* Child */

985

/* Raise privileges */

986

errno = raise_privileges_permanently();

987

if(errno != 0){

988

perror_plus("Failed to raise privileges");

989

/* _exit(EX_NOPERM); */

990

} else {

991

/* Set group */

992

errno = 0;

993

ret = setgid(0);

994

if(ret == -1){

995

perror_plus("setgid");

996

_exit(EX_NOPERM);

997

}

998

/* Reset supplementary groups */

999

errno = 0;

1000

ret = setgroups(0, NULL);

1001

if(ret == -1){

1002

perror_plus("setgroups");

1003

_exit(EX_NOPERM);

1004

}

1005

}

1006

ret = dup2(devnull, STDIN_FILENO);

1007

if(ret == -1){

1008

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

1009

_exit(EX_OSERR);

1010

}

1011

ret = close(devnull);

1012

if(ret == -1){

1013

perror_plus("close");

1014

_exit(EX_OSERR);

1015

}

1016

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1017

if(ret == -1){

1018

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

1019

_exit(EX_OSERR);

1020

}

1021

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

1022

O_RDONLY

1023

| O_DIRECTORY

1024

| O_PATH

1025

| O_CLOEXEC));

1026

if(helperdir_fd == -1){

1027

perror_plus("open");

1028

_exit(EX_UNAVAILABLE);

1029

}

1030

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

1031

helper, O_RDONLY));

1032

if(helper_fd == -1){

1033

perror_plus("openat");

1034

close(helperdir_fd);

1035

_exit(EX_UNAVAILABLE);

1036

}

1037

close(helperdir_fd);

1038

#ifdef __GNUC__

1039

#pragma GCC diagnostic push

1040

#pragma GCC diagnostic ignored "-Wcast-qual"

1041

#endif

1042

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

1043

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

1044

interface, debug ? debug_flag : NULL, NULL },

1045

environ) == -1){

1046

#ifdef __GNUC__

1047

#pragma GCC diagnostic pop

1048

#endif

1049

perror_plus("fexecve");

1050

_exit(EXIT_FAILURE);

1051

}

1052

}

1053

if(pid == -1){

1054

perror_plus("fork");

1055

return false;

1056

}

1057

int status;

1058

pid_t pret = -1;

1059

errno = 0;

1060

do {

1061

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

1062

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

1063

int errno_raising = 0;

1064

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

1065

errno_raising = errno;

1066

perror_plus("Failed to raise privileges in order to"

1067

" kill helper program");

1068

}

1069

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

1070

perror_plus("kill");

1071

}

1072

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

1073

perror_plus("Failed to lower privileges after killing"

1074

" helper program");

1075

}

1076

return false;

1077

}

1078

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

1079

if(pret == -1){

1080

perror_plus("waitpid");

1081

return false;

1082

}

1083

if(WIFEXITED(status)){

1084

if(WEXITSTATUS(status) != 0){

1085

fprintf_plus(stderr, "Error: iprouteadddel exited"

1086

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

1087

return false;

1088

}

1089

return true;

1090

}

1091

if(WIFSIGNALED(status)){

1092

fprintf_plus(stderr, "Error: iprouteadddel died by"

1093

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

1094

return false;

1095

}

1096

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

1097

return false;

1098

}

1099

1100

__attribute__((nonnull, warn_unused_result))

1101

static bool add_local_route(const char *address,

1102

AvahiIfIndex if_index){

1103

if(debug){

1104

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

1105

}

1106

return add_delete_local_route(true, address, if_index);

1107

}

1108

1109

__attribute__((nonnull, warn_unused_result))

1110

static bool delete_local_route(const char *address,

1111

AvahiIfIndex if_index){

1112

if(debug){

1113

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

1114

}

1115

return add_delete_local_route(false, address, if_index);

1116

}

1117

616

1118

/* Called when a Mandos server is found */

617

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

1119

__attribute__((nonnull, warn_unused_result))

1120

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

618

1121

AvahiIfIndex if_index,

619

int af){

1122

int af, mandos_context *mc){

620

1123

int ret, tcp_sd = -1;

621

1124

ssize_t sret;

622

union {

623

struct sockaddr_in in;

624

struct sockaddr_in6 in6;

625

} to;

1125

struct sockaddr_storage to;

626

1126

char *buffer = NULL;

627

1127

char *decrypted_buffer = NULL;

628

1128

size_t buffer_length = 0;

631

1131

int retval = -1;

632

1132

gnutls_session_t session;

633

1133

int pf; /* Protocol family */

1134

bool route_added = false;

634

1135

635

1136

errno = 0;

636

1137

652

1153

return -1;

653

1154

}

654

1155

655

ret = init_gnutls_session(&session);

1156

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

1157

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

1158

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

1159

bool match = false;

1160

{

1161

char *interface = NULL;

1162

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

1163

mc->interfaces_size,

1164

interface))){

1165

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

1166

match = true;

1167

break;

1168

}

1169

}

1170

}

1171

if(not match){

1172

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

1173

connect to the server */

1174

if(debug){

1175

char interface[IF_NAMESIZE];

1176

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

1177

perror_plus("if_indextoname");

1178

} else {

1179

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

1180

" \"%s\"\n",

1181

if_indextoname((unsigned int)if_index,

1182

interface));

1183

}

1184

}

1185

return -1;

1186

}

1187

}

1188

1189

ret = init_gnutls_session(&session, mc);

656

1190

if(ret != 0){

657

1191

return -1;

658

1192

}

659

1193

660

1194

if(debug){

661

1195

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

662

PRIu16 "\n", ip, port);

1196

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

663

1197

}

664

1198

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

1199

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

666

1200

if(tcp_sd < 0){

667

1201

int e = errno;

668

1202

perror_plus("socket");

675

1209

goto mandos_end;

676

1210

}

677

1211

678

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

679

1212

if(af == AF_INET6){

680

to.in6.sin6_family = (sa_family_t)af;

681

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

1213

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

1214

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

1215

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

682

1216

} else { /* IPv4 */

683

to.in.sin_family = (sa_family_t)af;

684

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

1217

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

1218

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

1219

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

685

1220

}

686

1221

if(ret < 0 ){

687

1222

int e = errno;

696

1231

goto mandos_end;

697

1232

}

698

1233

if(af == AF_INET6){

699

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

700

-Wconversion and

701

-Wunreachable-code */

702

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

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

705

-Wunreachable-code*/

1234

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

1235

if(IN6_IS_ADDR_LINKLOCAL

1236

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

706

1237

if(if_index == AVAHI_IF_UNSPEC){

707

1238

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

708

1239

" incomplete without a network interface\n");

710

1241

goto mandos_end;

711

1242

}

712

1243

/* Set the network interface number as scope */

713

to.in6.sin6_scope_id = (uint32_t)if_index;

1244

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

714

1245

}

715

1246

} else {

716

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

717

-Wconversion and

718

-Wunreachable-code */

1247

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

719

1248

}

720

1249

721

1250

if(quit_now){

729

1258

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

730

1259

perror_plus("if_indextoname");

731

1260

} else {

732

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

733

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

1261

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

1262

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

734

1263

}

735

1264

} else {

736

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

737

ip, port);

1265

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

1266

ip, (uintmax_t)port);

738

1267

}

739

1268

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

1269

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

741

const char *pcret;

742

if(af == AF_INET6){

743

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

744

sizeof(addrstr));

745

} else {

746

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

747

sizeof(addrstr));

748

}

749

if(pcret == NULL){

750

perror_plus("inet_ntop");

751

} else {

752

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

753

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

754

}

755

}

756

}

757

758

if(quit_now){

759

errno = EINTR;

760

goto mandos_end;

761

}

762

763

if(af == AF_INET6){

764

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

765

} else {

766

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

767

}

768

if(ret < 0){

769

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

770

int e = errno;

771

perror_plus("connect");

772

errno = e;

773

}

774

goto mandos_end;

775

}

776

777

if(quit_now){

778

errno = EINTR;

779

goto mandos_end;

1270

if(af == AF_INET6){

1271

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

1272

sizeof(struct sockaddr_in6),

1273

addrstr, sizeof(addrstr), NULL, 0,

1274

NI_NUMERICHOST);

1275

} else {

1276

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

1277

sizeof(struct sockaddr_in),

1278

addrstr, sizeof(addrstr), NULL, 0,

1279

NI_NUMERICHOST);

1280

}

1281

if(ret == EAI_SYSTEM){

1282

perror_plus("getnameinfo");

1283

} else if(ret != 0) {

1284

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

1285

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

1286

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

1287

}

1288

}

1289

1290

if(quit_now){

1291

errno = EINTR;

1292

goto mandos_end;

1293

}

1294

1295

while(true){

1296

if(af == AF_INET6){

1297

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

1298

sizeof(struct sockaddr_in6));

1299

} else {

1300

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

1301

sizeof(struct sockaddr_in));

1302

}

1303

if(ret < 0){

1304

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

1305

and if_index != AVAHI_IF_UNSPEC

1306

and connect_to == NULL

1307

and not route_added and

1308

((af == AF_INET6 and not

1309

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1310

&to)->sin6_addr)))

1311

or (af == AF_INET and

1312

/* Not a a IPv4LL address */

1313

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

1314

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

1315

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

1316

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

1317

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

1318

connect to a Mandos server announced by Avahi on a server

1319

host with a global address. Work around this by retrying

1320

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

1321

1322

Avahi bug reference:

1323

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

1324

https://bugs.debian.org/587961

1325

*/

1326

if(debug){

1327

fprintf_plus(stderr, "Mandos server unreachable, trying"

1328

" direct route\n");

1329

}

1330

int e = errno;

1331

route_added = add_local_route(ip, if_index);

1332

if(route_added){

1333

continue;

1334

}

1335

errno = e;

1336

}

1337

if(errno != ECONNREFUSED or debug){

1338

int e = errno;

1339

perror_plus("connect");

1340

errno = e;

1341

}

1342

goto mandos_end;

1343

}

1344

1345

if(quit_now){

1346

errno = EINTR;

1347

goto mandos_end;

1348

}

1349

break;

780

1350

}

781

1351

782

1352

const char *out = mandos_protocol_version;

818

1388

goto mandos_end;

819

1389

}

820

1390

821

/* Spurious warning from -Wint-to-pointer-cast */

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1391

/* This casting via intptr_t is to eliminate warning about casting

1392

an int to a pointer type. This is exactly how the GnuTLS Guile

1393

function "set-session-transport-fd!" does it. */

1394

gnutls_transport_set_ptr(session,

1395

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

823

1396

824

1397

if(quit_now){

825

1398

errno = EINTR;

930

1503

if(buffer_length > 0){

931

1504

ssize_t decrypted_buffer_size;

932

1505

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

933

&decrypted_buffer);

1506

&decrypted_buffer, mc);

934

1507

if(decrypted_buffer_size >= 0){

935

1508

1509

clearerr(stdout);

936

1510

written = 0;

937

1511

while(written < (size_t) decrypted_buffer_size){

938

1512

if(quit_now){

954

1528

}

955

1529

written += (size_t)ret;

956

1530

}

1531

ret = fflush(stdout);

1532

if(ret != 0){

1533

int e = errno;

1534

if(debug){

1535

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

1536

strerror(errno));

1537

}

1538

errno = e;

1539

goto mandos_end;

1540

}

957

1541

retval = 0;

958

1542

}

959

1543

}

962

1546

963

1547

mandos_end:

964

1548

{

1549

if(route_added){

1550

if(not delete_local_route(ip, if_index)){

1551

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

1552

" interface %d", ip, if_index);

1553

}

1554

}

965

1555

int e = errno;

966

1556

free(decrypted_buffer);

967

1557

free(buffer);

968

1558

if(tcp_sd >= 0){

969

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

1559

ret = close(tcp_sd);

970

1560

}

971

1561

if(ret == -1){

972

1562

if(e == 0){

997

1587

AVAHI_GCC_UNUSED AvahiStringList *txt,

998

1588

AVAHI_GCC_UNUSED AvahiLookupResultFlags

999

1589

flags,

1000

AVAHI_GCC_UNUSED void* userdata){

1001

assert(r);

1590

void *mc){

1591

if(r == NULL){

1592

return;

1593

}

1002

1594

1003

1595

/* Called whenever a service has been resolved successfully or

1004

1596

timed out */

1005

1597

1006

1598

if(quit_now){

1599

avahi_s_service_resolver_free(r);

1007

1600

return;

1008

1601

}

1009

1602

1013

1606

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

1014

1607

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

1015

1608

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

1609

avahi_strerror(avahi_server_errno

1610

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

1017

1611

break;

1018

1612

1019

1613

case AVAHI_RESOLVER_FOUND:

1025

1619

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

1026

1620

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

1027

1621

}

1028

int ret = start_mandos_communication(ip, port, interface,

1029

avahi_proto_to_af(proto));

1622

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

1623

interface,

1624

avahi_proto_to_af(proto),

1625

mc);

1030

1626

if(ret == 0){

1031

avahi_simple_poll_quit(mc.simple_poll);

1627

avahi_simple_poll_quit(simple_poll);

1032

1628

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

1629

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

1630

avahi_proto_to_af(proto),

1631

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

1632

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

1633

" list\n", name);

1634

}

1035

1635

}

1036

1636

}

1037

1637

}

1047

1647

const char *domain,

1048

1648

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1049

1649

flags,

1050

AVAHI_GCC_UNUSED void* userdata){

1051

assert(b);

1650

void *mc){

1651

if(b == NULL){

1652

return;

1653

}

1052

1654

1053

1655

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

1054

1656

is removed from the LAN */

1062

1664

case AVAHI_BROWSER_FAILURE:

1063

1665

1064

1666

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

1066

avahi_simple_poll_quit(mc.simple_poll);

1667

avahi_strerror(avahi_server_errno

1668

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

1669

avahi_simple_poll_quit(simple_poll);

1067

1670

return;

1068

1671

1069

1672

case AVAHI_BROWSER_NEW:

1072

1675

the callback function is called the Avahi server will free the

1073

1676

resolver for us. */

1074

1677

1075

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

1076

name, type, domain, protocol, 0,

1077

resolve_callback, NULL) == NULL)

1678

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

1679

interface, protocol, name, type,

1680

domain, protocol, 0,

1681

resolve_callback, mc) == NULL)

1078

1682

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

1079

1683

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

1684

avahi_strerror(avahi_server_errno

1685

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

1081

1686

break;

1082

1687

1083

1688

case AVAHI_BROWSER_REMOVE:

1102

1707

signal_received = sig;

1103

1708

int old_errno = errno;

1104

1709

/* set main loop to exit */

1105

if(mc.simple_poll != NULL){

1106

avahi_simple_poll_quit(mc.simple_poll);

1710

if(simple_poll != NULL){

1711

avahi_simple_poll_quit(simple_poll);

1107

1712

}

1108

1713

errno = old_errno;

1109

1714

}

1110

1715

1716

__attribute__((nonnull, warn_unused_result))

1111

1717

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

1112

1718

int ret;

1719

int old_errno;

1113

1720

1114

1721

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

1115

1722

if(s < 0){

1723

old_errno = errno;

1116

1724

perror_plus("socket");

1725

errno = old_errno;

1117

1726

return false;

1118

1727

}

1119

strcpy(ifr->ifr_name, ifname);

1728

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

1729

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

1120

1730

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

1731

if(ret == -1){

1122

1732

if(debug){

1733

old_errno = errno;

1123

1734

perror_plus("ioctl SIOCGIFFLAGS");

1735

errno = old_errno;

1736

}

1737

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

1738

old_errno = errno;

1739

perror_plus("close");

1740

errno = old_errno;

1124

1741

}

1125

1742

return false;

1126

1743

}

1744

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

1745

old_errno = errno;

1746

perror_plus("close");

1747

errno = old_errno;

1748

}

1127

1749

return true;

1128

1750

}

1129

1751

1752

__attribute__((nonnull, warn_unused_result))

1130

1753

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

1131

1754

1132

1755

/* Reject the loopback device */

1174

1797

* corresponds to an acceptable network device.

1175

1798

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

1176

1799

*/

1800

__attribute__((nonnull, warn_unused_result))

1177

1801

int good_interface(const struct dirent *if_entry){

1178

1802

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

1179

1803

return 0;

1195

1819

}

1196

1820

1197

1821

/*

1198

* This function determines if a directory entry in /sys/class/net

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

if(not get_flags(if_entry->d_name, &ifr)){

1209

if(debug){

1210

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

1211

"\"%s\"\n", if_entry->d_name);

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

if(not (ifr.ifr_flags & IFF_UP)){

1218

if(debug){

1219

fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

if(not (ifr.ifr_flags & IFF_RUNNING)){

1227

if(debug){

1228

fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

if(not good_flags(if_entry->d_name, &ifr)){

1235

return 0;

1236

}

1237

return 1;

1238

}

1239

1822

* This function determines if a network interface is up.

1823

*/

1824

__attribute__((nonnull, warn_unused_result))

1825

bool interface_is_up(const char *interface){

1826

struct ifreq ifr;

1827

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

1828

if(debug){

1829

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

1830

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

1831

}

1832

return false;

1833

}

1834

1835

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

1836

}

1837

1838

/*

1839

* This function determines if a network interface is running

1840

*/

1841

__attribute__((nonnull, warn_unused_result))

1842

bool interface_is_running(const char *interface){

1843

struct ifreq ifr;

1844

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

1845

if(debug){

1846

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

1847

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

1848

}

1849

return false;

1850

}

1851

1852

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

1853

}

1854

1855

__attribute__((nonnull, pure, warn_unused_result))

1240

1856

int notdotentries(const struct dirent *direntry){

1241

1857

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

1242

1858

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

1249

1865

}

1250

1866

1251

1867

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

1868

__attribute__((nonnull, warn_unused_result))

1252

1869

int runnable_hook(const struct dirent *direntry){

1253

1870

int ret;

1254

1871

size_t sret;

1262

1879

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

1263

1880

"abcdefghijklmnopqrstuvwxyz"

1264

1881

"0123456789"

1265

"_-");

1882

"_.-");

1266

1883

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

1267

1884

/* Contains non-allowed characters */

1268

1885

if(debug){

1272

1889

return 0;

1273

1890

}

1274

1891

1275

char *fullname = NULL;

1276

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

1277

if(ret < 0){

1278

perror_plus("asprintf");

1279

return 0;

1280

}

1281

1282

ret = stat(fullname, &st);

1892

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

1283

1893

if(ret == -1){

1284

1894

if(debug){

1285

1895

perror_plus("Could not stat hook");

1309

1919

return 1;

1310

1920

}

1311

1921

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1922

__attribute__((nonnull, warn_unused_result))

1923

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1924

mandos_context *mc){

1313

1925

int ret;

1314

1926

struct timespec now;

1315

1927

struct timespec waited_time;

1316

1928

intmax_t block_time;

1317

1929

1318

1930

while(true){

1319

if(mc.current_server == NULL){

1320

if (debug){

1931

if(mc->current_server == NULL){

1932

if(debug){

1321

1933

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

1322

1934

" No timeout!\n");

1323

1935

}

1324

1936

ret = avahi_simple_poll_iterate(s, -1);

1325

1937

} else {

1326

if (debug){

1938

if(debug){

1327

1939

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

1328

1940

" it, or wait\n");

1329

1941

}

1336

1948

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

1337

1949

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

1338

1950

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1951

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

1340

1952

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1953

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

1342

1954

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

1343

1955

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

1344

1956

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

1346

1958

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

1347

1959

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

1348

1960

1349

if (debug){

1961

if(debug){

1350

1962

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

1351

1963

block_time);

1352

1964

}

1353

1965

1354

1966

if(block_time <= 0){

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1967

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

1968

mc->current_server->port,

1969

mc->current_server->if_index,

1970

mc->current_server->af, mc);

1359

1971

if(ret == 0){

1360

avahi_simple_poll_quit(mc.simple_poll);

1972

avahi_simple_poll_quit(s);

1361

1973

return 0;

1362

1974

}

1363

1975

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1976

&mc->current_server->last_seen);

1365

1977

if(ret == -1){

1366

1978

perror_plus("clock_gettime");

1367

1979

return -1;

1368

1980

}

1369

mc.current_server = mc.current_server->next;

1981

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

1370

1982

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

1371

1983

servers, but don't block */

1372

1984

}

1374

1986

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

1375

1987

}

1376

1988

if(ret != 0){

1377

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

1989

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

1378

1990

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

1379

1991

}

1380

1992

}

1381

1993

}

1382

1994

}

1383

1995

1384

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

1996

__attribute__((nonnull))

1997

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

1385

1998

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1999

struct dirent **direntries = NULL;

2000

if(hookdir_fd == -1){

2001

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

2002

| O_CLOEXEC);

2003

if(hookdir_fd == -1){

2004

if(errno == ENOENT){

2005

if(debug){

2006

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

2007

" found\n", hookdir);

2008

}

2009

} else {

2010

perror_plus("open");

2011

}

2012

return;

2013

}

2014

}

2015

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

2016

if(devnull == -1){

2017

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

2018

return;

2019

}

2020

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

2021

runnable_hook, alphasort);

1391

2022

if(numhooks == -1){

1392

2023

perror_plus("scandir");

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

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

1399

if(ret < 0){

2024

close(devnull);

2025

return;

2026

}

2027

struct dirent *direntry;

2028

int ret;

2029

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

2030

direntry = direntries[i];

2031

if(debug){

2032

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

2033

direntry->d_name);

2034

}

2035

pid_t hook_pid = fork();

2036

if(hook_pid == 0){

2037

/* Child */

2038

/* Raise privileges */

2039

errno = raise_privileges_permanently();

2040

if(errno != 0){

2041

perror_plus("Failed to raise privileges");

2042

_exit(EX_NOPERM);

2043

}

2044

/* Set group */

2045

errno = 0;

2046

ret = setgid(0);

2047

if(ret == -1){

2048

perror_plus("setgid");

2049

_exit(EX_NOPERM);

2050

}

2051

/* Reset supplementary groups */

2052

errno = 0;

2053

ret = setgroups(0, NULL);

2054

if(ret == -1){

2055

perror_plus("setgroups");

2056

_exit(EX_NOPERM);

2057

}

2058

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

2059

if(ret == -1){

2060

perror_plus("setenv");

2061

_exit(EX_OSERR);

2062

}

2063

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

2064

if(ret == -1){

2065

perror_plus("setenv");

2066

_exit(EX_OSERR);

2067

}

2068

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

2069

if(ret == -1){

2070

perror_plus("setenv");

2071

_exit(EX_OSERR);

2072

}

2073

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

2074

if(ret == -1){

2075

perror_plus("setenv");

2076

_exit(EX_OSERR);

2077

}

2078

char *delaystring;

2079

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

2080

if(ret == -1){

1400

2081

perror_plus("asprintf");

1401

continue;

1402

}

1403

if(debug){

1404

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

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

dup2(devnull, STDIN_FILENO);

1435

close(devnull);

1436

dup2(STDERR_FILENO, STDOUT_FILENO);

1437

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

1438

if(ret == -1){

1439

perror_plus("setenv");

1440

_exit(EX_OSERR);

1441

}

1442

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

1443

if(ret == -1){

1444

perror_plus("setenv");

1445

_exit(EX_OSERR);

1446

}

1447

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

1448

if(ret == -1){

1449

perror_plus("setenv");

1450

_exit(EX_OSERR);

1451

}

1452

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

1453

if(ret == -1){

1454

perror_plus("setenv");

1455

_exit(EX_OSERR);

1456

}

1457

char *delaystring;

1458

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

1459

if(ret == -1){

1460

perror_plus("asprintf");

1461

_exit(EX_OSERR);

1462

}

1463

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

1464

if(ret == -1){

1465

free(delaystring);

1466

perror_plus("setenv");

1467

_exit(EX_OSERR);

1468

}

2082

_exit(EX_OSERR);

2083

}

2084

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

2085

if(ret == -1){

1469

2086

free(delaystring);

1470

ret = execl(fullname, direntry->d_name, mode, NULL);

1471

perror_plus("execl");

1472

} else {

1473

int status;

1474

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

1475

perror_plus("waitpid");

1476

free(fullname);

1477

continue;

1478

}

1479

if(WIFEXITED(status)){

1480

if(WEXITSTATUS(status) != 0){

1481

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

1482

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

1483

WEXITSTATUS(status));

1484

free(fullname);

1485

continue;

1486

}

1487

} else if(WIFSIGNALED(status)){

1488

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

1489

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

1490

WTERMSIG(status));

1491

free(fullname);

1492

continue;

1493

} else {

1494

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

1495

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

1496

free(fullname);

1497

continue;

1498

}

1499

}

1500

free(fullname);

1501

if(debug){

1502

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

1503

direntry->d_name);

1504

}

1505

}

1506

close(devnull);

1507

}

1508

return true;

2087

perror_plus("setenv");

2088

_exit(EX_OSERR);

2089

}

2090

free(delaystring);

2091

if(connect_to != NULL){

2092

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

2093

if(ret == -1){

2094

perror_plus("setenv");

2095

_exit(EX_OSERR);

2096

}

2097

}

2098

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

2099

direntry->d_name,

2100

O_RDONLY));

2101

if(hook_fd == -1){

2102

perror_plus("openat");

2103

_exit(EXIT_FAILURE);

2104

}

2105

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

2106

perror_plus("close");

2107

_exit(EXIT_FAILURE);

2108

}

2109

ret = dup2(devnull, STDIN_FILENO);

2110

if(ret == -1){

2111

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

2112

_exit(EX_OSERR);

2113

}

2114

ret = close(devnull);

2115

if(ret == -1){

2116

perror_plus("close");

2117

_exit(EX_OSERR);

2118

}

2119

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2120

if(ret == -1){

2121

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

2122

_exit(EX_OSERR);

2123

}

2124

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

2125

environ) == -1){

2126

perror_plus("fexecve");

2127

_exit(EXIT_FAILURE);

2128

}

2129

} else {

2130

if(hook_pid == -1){

2131

perror_plus("fork");

2132

free(direntry);

2133

continue;

2134

}

2135

int status;

2136

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

2137

perror_plus("waitpid");

2138

free(direntry);

2139

continue;

2140

}

2141

if(WIFEXITED(status)){

2142

if(WEXITSTATUS(status) != 0){

2143

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

2144

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

2145

WEXITSTATUS(status));

2146

free(direntry);

2147

continue;

2148

}

2149

} else if(WIFSIGNALED(status)){

2150

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

2151

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

2152

WTERMSIG(status));

2153

free(direntry);

2154

continue;

2155

} else {

2156

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

2157

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

2158

free(direntry);

2159

continue;

2160

}

2161

}

2162

if(debug){

2163

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

2164

direntry->d_name);

2165

}

2166

free(direntry);

2167

}

2168

free(direntries);

2169

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

2170

perror_plus("close");

2171

} else {

2172

hookdir_fd = -1;

2173

}

2174

close(devnull);

2175

}

2176

2177

__attribute__((nonnull, warn_unused_result))

2178

int bring_up_interface(const char *const interface,

2179

const float delay){

2180

int old_errno = errno;

2181

int ret;

2182

struct ifreq network;

2183

unsigned int if_index = if_nametoindex(interface);

2184

if(if_index == 0){

2185

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

2186

errno = old_errno;

2187

return ENXIO;

2188

}

2189

2190

if(quit_now){

2191

errno = old_errno;

2192

return EINTR;

2193

}

2194

2195

if(not interface_is_up(interface)){

2196

int ret_errno = 0;

2197

int ioctl_errno = 0;

2198

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

2199

ret_errno = errno;

2200

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

2201

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

2202

errno = old_errno;

2203

return ret_errno;

2204

}

2205

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

2206

2207

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

2208

if(sd == -1){

2209

ret_errno = errno;

2210

perror_plus("socket");

2211

errno = old_errno;

2212

return ret_errno;

2213

}

2214

2215

if(quit_now){

2216

ret = close(sd);

2217

if(ret == -1){

2218

perror_plus("close");

2219

}

2220

errno = old_errno;

2221

return EINTR;

2222

}

2223

2224

if(debug){

2225

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

2226

interface);

2227

}

2228

2229

/* Raise privileges */

2230

ret_errno = raise_privileges();

2231

if(ret_errno != 0){

2232

errno = ret_errno;

2233

perror_plus("Failed to raise privileges");

2234

}

2235

2236

#ifdef __linux__

2237

int ret_linux;

2238

bool restore_loglevel = false;

2239

if(ret_errno == 0){

2240

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2241

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

2242

ret_linux = klogctl(8, NULL, 5);

2243

if(ret_linux == -1){

2244

perror_plus("klogctl");

2245

} else {

2246

restore_loglevel = true;

2247

}

2248

}

2249

#endif /* __linux__ */

2250

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

2251

ioctl_errno = errno;

2252

#ifdef __linux__

2253

if(restore_loglevel){

2254

ret_linux = klogctl(7, NULL, 0);

2255

if(ret_linux == -1){

2256

perror_plus("klogctl");

2257

}

2258

}

2259

#endif /* __linux__ */

2260

2261

/* If raise_privileges() succeeded above */

2262

if(ret_errno == 0){

2263

/* Lower privileges */

2264

ret_errno = lower_privileges();

2265

if(ret_errno != 0){

2266

errno = ret_errno;

2267

perror_plus("Failed to lower privileges");

2268

}

2269

}

2270

2271

/* Close the socket */

2272

ret = close(sd);

2273

if(ret == -1){

2274

perror_plus("close");

2275

}

2276

2277

if(ret_setflags == -1){

2278

errno = ioctl_errno;

2279

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2280

errno = old_errno;

2281

return ioctl_errno;

2282

}

2283

} else if(debug){

2284

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

2285

interface);

2286

}

2287

2288

/* Sleep checking until interface is running.

2289

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

2290

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

2291

if(interface_is_running(interface)){

2292

break;

2293

}

2294

struct timespec sleeptime = { .tv_nsec = 250000000 };

2295

ret = nanosleep(&sleeptime, NULL);

2296

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

2297

perror_plus("nanosleep");

2298

}

2299

}

2300

2301

errno = old_errno;

2302

return 0;

2303

}

2304

2305

__attribute__((nonnull, warn_unused_result))

2306

int take_down_interface(const char *const interface){

2307

int old_errno = errno;

2308

struct ifreq network;

2309

unsigned int if_index = if_nametoindex(interface);

2310

if(if_index == 0){

2311

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

2312

errno = old_errno;

2313

return ENXIO;

2314

}

2315

if(interface_is_up(interface)){

2316

int ret_errno = 0;

2317

int ioctl_errno = 0;

2318

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

2319

ret_errno = errno;

2320

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

2321

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

2322

errno = old_errno;

2323

return ret_errno;

2324

}

2325

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

2326

2327

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

2328

if(sd == -1){

2329

ret_errno = errno;

2330

perror_plus("socket");

2331

errno = old_errno;

2332

return ret_errno;

2333

}

2334

2335

if(debug){

2336

fprintf_plus(stderr, "Taking down interface \"%s\"\n",

2337

interface);

2338

}

2339

2340

/* Raise privileges */

2341

ret_errno = raise_privileges();

2342

if(ret_errno != 0){

2343

errno = ret_errno;

2344

perror_plus("Failed to raise privileges");

2345

}

2346

2347

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

2348

ioctl_errno = errno;

2349

2350

/* If raise_privileges() succeeded above */

2351

if(ret_errno == 0){

2352

/* Lower privileges */

2353

ret_errno = lower_privileges();

2354

if(ret_errno != 0){

2355

errno = ret_errno;

2356

perror_plus("Failed to lower privileges");

2357

}

2358

}

2359

2360

/* Close the socket */

2361

int ret = close(sd);

2362

if(ret == -1){

2363

perror_plus("close");

2364

}

2365

2366

if(ret_setflags == -1){

2367

errno = ioctl_errno;

2368

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2369

errno = old_errno;

2370

return ioctl_errno;

2371

}

2372

} else if(debug){

2373

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

2374

interface);

2375

}

2376

2377

errno = old_errno;

2378

return 0;

1509

2379

}

1510

2380

1511

2381

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

2382

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

2383

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

2384

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

2385

.current_server = NULL, .interfaces = NULL,

2386

.interfaces_size = 0 };

1512

2387

AvahiSServiceBrowser *sb = NULL;

1513

int error;

2388

error_t ret_errno;

1514

2389

int ret;

1515

2390

intmax_t tmpmax;

1516

2391

char *tmp;

1517

2392

int exitcode = EXIT_SUCCESS;

1518

const char *interface = "";

1519

struct ifreq network;

1520

int sd = -1;

1521

bool take_down_interface = false;

1522

uid_t uid;

1523

gid_t gid;

1524

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

1525

bool tempdir_created = false;

2393

char *interfaces_to_take_down = NULL;

2394

size_t interfaces_to_take_down_size = 0;

2395

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

2396

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

2397

char *tempdir = NULL;

1526

2398

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1527

2399

const char *seckey = PATHDIR "/" SECKEY;

1528

2400

const char *pubkey = PATHDIR "/" PUBKEY;

2401

const char *dh_params_file = NULL;

2402

char *interfaces_hooks = NULL;

1529

2403

1530

2404

bool gnutls_initialized = false;

1531

2405

bool gpgme_initialized = false;

1583

2457

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

1584

2458

" Diffie-Hellman key exchange",

1585

2459

.group = 2 },

2460

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

2461

.arg = "FILE",

2462

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

2463

" for the Diffie-Hellman key exchange",

2464

.group = 2 },

1586

2465

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

1587

2466

.arg = "STRING",

1588

2467

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

1593

2472

.group = 2 },

1594

2473

{ .name = "retry", .key = 132,

1595

2474

.arg = "SECONDS",

1596

.doc = "Retry interval used when denied by the mandos server",

2475

.doc = "Retry interval used when denied by the Mandos server",

1597

2476

.group = 2 },

1598

2477

{ .name = "network-hook-dir", .key = 133,

1599

2478

.arg = "DIR",

1622

2501

connect_to = arg;

1623

2502

break;

1624

2503

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

1625

interface = arg;

2504

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

2505

arg, (int)',');

2506

if(ret_errno != 0){

2507

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

2508

}

1626

2509

break;

1627

2510

case 's': /* --seckey */

1628

2511

seckey = arg;

1639

2522

}

1640

2523

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

1641

2524

break;

2525

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

2526

dh_params_file = arg;

2527

break;

1642

2528

case 130: /* --priority */

1643

2529

mc.priority = arg;

1644

2530

break;

1671

2557

argp_state_help(state, state->out_stream,

1672

2558

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

2559

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

2560

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

1677

2561

exit(argp_err_exit_status);

1678

2562

break;

1686

2570

.args_doc = "",

1687

2571

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

1688

2572

" passwords from a Mandos server" };

1689

ret = argp_parse(&argp, argc, argv,

1690

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1691

switch(ret){

2573

ret_errno = argp_parse(&argp, argc, argv,

2574

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2575

switch(ret_errno){

1692

2576

case 0:

1693

2577

break;

1694

2578

case ENOMEM:

1695

2579

default:

1696

errno = ret;

2580

errno = ret_errno;

1697

2581

perror_plus("argp_parse");

1698

2582

exitcode = EX_OSERR;

1699

2583

goto end;

1702

2586

goto end;

1703

2587

}

1704

2588

}

1705

2589

1706

2590

{

1707

2591

/* Work around Debian bug #633582:

1708

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

2592

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

1709

2593

1710

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

2594

/* Re-raise privileges */

2595

ret = raise_privileges();

2596

if(ret != 0){

2597

errno = ret;

2598

perror_plus("Failed to raise privileges");

1715

2599

} else {

1716

2600

struct stat st;

1717

2601

1732

2616

}

1733

2617

}

1734

2618

}

1735

TEMP_FAILURE_RETRY(close(seckey_fd));

2619

close(seckey_fd);

1736

2620

}

1737

2621

}

1738

2622

1739

2623

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

1740

2624

int pubkey_fd = open(pubkey, O_RDONLY);

1741

2625

if(pubkey_fd == -1){

1753

2637

}

1754

2638

}

1755

2639

}

1756

TEMP_FAILURE_RETRY(close(pubkey_fd));

1757

}

1758

}

1759

2640

close(pubkey_fd);

2641

}

2642

}

2643

2644

if(dh_params_file != NULL

2645

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

2646

int dhparams_fd = open(dh_params_file, O_RDONLY);

2647

if(dhparams_fd == -1){

2648

perror_plus("open");

2649

} else {

2650

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

2651

if(ret == -1){

2652

perror_plus("fstat");

2653

} else {

2654

if(S_ISREG(st.st_mode)

2655

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

2656

ret = fchown(dhparams_fd, uid, gid);

2657

if(ret == -1){

2658

perror_plus("fchown");

2659

}

2660

}

2661

}

2662

close(dhparams_fd);

2663

}

2664

}

2665

1760

2666

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

2667

ret = lower_privileges();

2668

if(ret != 0){

2669

errno = ret;

2670

perror_plus("Failed to lower privileges");

2671

}

2672

}

2673

}

2674

2675

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

2676

{

2677

char *interface = NULL;

2678

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

2679

interface))){

2680

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

2681

and if_nametoindex(interface) == 0){

2682

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

2683

fprintf_plus(stderr, "Not using nonexisting interface"

2684

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

2685

}

2686

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

2687

interface = NULL;

1765

2688

}

1766

2689

}

1767

2690

}

1768

2691

1769

2692

/* Run network hooks */

1770

if(not run_network_hooks("start", interface, delay)){

1771

goto end;

2693

{

2694

if(mc.interfaces != NULL){

2695

interfaces_hooks = malloc(mc.interfaces_size);

2696

if(interfaces_hooks == NULL){

2697

perror_plus("malloc");

2698

goto end;

2699

}

2700

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

2701

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

2702

}

2703

run_network_hooks("start", interfaces_hooks != NULL ?

2704

interfaces_hooks : "", delay);

1772

2705

}

1773

2706

1774

2707

if(not debug){

1775

2708

avahi_set_log_function(empty_log);

1776

2709

}

1777

2710

1778

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

1779

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1782

alphasort);

1783

if(ret == 0){

1784

/* No up interfaces, look for any good interfaces */

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

if(ret >= 1){

1790

/* Pick the first interface returned */

1791

interface = strdup(direntries[0]->d_name);

1792

if(debug){

1793

fprintf_plus(stderr, "Using interface \"%s\"\n", interface);

1794

}

1795

if(interface == NULL){

1796

perror_plus("malloc");

1797

free(direntries);

1798

exitcode = EXIT_FAILURE;

1799

goto end;

1800

}

1801

free(direntries);

1802

} else {

1803

free(direntries);

1804

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

1805

exitcode = EXIT_FAILURE;

1806

goto end;

1807

}

1808

}

1809

1810

2711

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

1811

2712

from the signal handler */

1812

2713

/* Initialize the pseudo-RNG for Avahi */

1813

2714

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

1814

mc.simple_poll = avahi_simple_poll_new();

1815

if(mc.simple_poll == NULL){

2715

simple_poll = avahi_simple_poll_new();

2716

if(simple_poll == NULL){

1816

2717

fprintf_plus(stderr,

1817

2718

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

1818

2719

exitcode = EX_UNAVAILABLE;

1882

2783

}

1883

2784

}

1884

2785

1885

/* If the interface is down, bring it up */

1886

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

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1888

if(if_index == 0){

1889

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

1890

exitcode = EX_UNAVAILABLE;

1891

goto end;

1892

}

1893

1894

if(quit_now){

1895

goto end;

1896

}

1897

1898

/* Re-raise priviliges */

1899

errno = 0;

1900

ret = seteuid(0);

1901

if(ret == -1){

1902

perror_plus("seteuid");

1903

}

1904

1905

#ifdef __linux__

1906

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1907

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

1908

ret = klogctl(8, NULL, 5);

1909

bool restore_loglevel = true;

1910

if(ret == -1){

1911

restore_loglevel = false;

1912

perror_plus("klogctl");

1913

}

1914

#endif /* __linux__ */

1915

1916

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1917

if(sd < 0){

1918

perror_plus("socket");

1919

exitcode = EX_OSERR;

1920

#ifdef __linux__

1921

if(restore_loglevel){

1922

ret = klogctl(7, NULL, 0);

1923

if(ret == -1){

1924

perror_plus("klogctl");

1925

}

1926

}

1927

#endif /* __linux__ */

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1934

goto end;

1935

}

1936

strcpy(network.ifr_name, interface);

1937

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1938

if(ret == -1){

1939

perror_plus("ioctl SIOCGIFFLAGS");

1940

#ifdef __linux__

1941

if(restore_loglevel){

1942

ret = klogctl(7, NULL, 0);

1943

if(ret == -1){

1944

perror_plus("klogctl");

1945

}

1946

}

1947

#endif /* __linux__ */

1948

exitcode = EX_OSERR;

1949

/* Lower privileges */

1950

errno = 0;

1951

ret = seteuid(uid);

1952

if(ret == -1){

1953

perror_plus("seteuid");

1954

}

1955

goto end;

1956

}

1957

if((network.ifr_flags & IFF_UP) == 0){

1958

network.ifr_flags |= IFF_UP;

1959

take_down_interface = true;

1960

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

1961

if(ret == -1){

1962

take_down_interface = false;

1963

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1964

exitcode = EX_OSERR;

1965

#ifdef __linux__

1966

if(restore_loglevel){

1967

ret = klogctl(7, NULL, 0);

1968

if(ret == -1){

1969

perror_plus("klogctl");

2786

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

2787

if(mc.interfaces == NULL){

2788

struct dirent **direntries = NULL;

2789

/* Look for any good interfaces */

2790

ret = scandir(sys_class_net, &direntries, good_interface,

2791

alphasort);

2792

if(ret >= 1){

2793

/* Add all found interfaces to interfaces list */

2794

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

2795

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

2796

direntries[i]->d_name);

2797

if(ret_errno != 0){

2798

errno = ret_errno;

2799

perror_plus("argz_add");

2800

free(direntries[i]);

2801

continue;

2802

}

2803

if(debug){

2804

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

2805

direntries[i]->d_name);

2806

}

2807

free(direntries[i]);

2808

}

2809

free(direntries);

2810

} else {

2811

if(ret == 0){

2812

free(direntries);

2813

}

2814

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

2815

exitcode = EXIT_FAILURE;

2816

goto end;

2817

}

2818

}

2819

2820

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

2821

{

2822

char *interface = NULL;

2823

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

2824

interface))){

2825

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

2826

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

2827

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

2828

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

2829

interface);

2830

interface = NULL;

2831

while((interface = argz_next(mc.interfaces,

2832

mc.interfaces_size, interface))){

2833

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

2834

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

2835

interface);

2836

interface = NULL;

1970

2837

}

1971

2838

}

1972

#endif /* __linux__ */

1973

/* Lower privileges */

1974

errno = 0;

1975

ret = seteuid(uid);

1976

if(ret == -1){

1977

perror_plus("seteuid");

1978

}

1979

goto end;

1980

}

1981

}

1982

/* Sleep checking until interface is running.

1983

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

1984

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

1985

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1986

if(ret == -1){

1987

perror_plus("ioctl SIOCGIFFLAGS");

1988

} else if(network.ifr_flags & IFF_RUNNING){

1989

2839

break;

1990

2840

}

1991

struct timespec sleeptime = { .tv_nsec = 250000000 };

1992

ret = nanosleep(&sleeptime, NULL);

1993

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

1994

perror_plus("nanosleep");

1995

}

1996

}

1997

if(not take_down_interface){

1998

/* We won't need the socket anymore */

1999

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

2000

if(ret == -1){

2001

perror_plus("close");

2002

}

2003

}

2004

#ifdef __linux__

2005

if(restore_loglevel){

2006

/* Restores kernel loglevel to default */

2007

ret = klogctl(7, NULL, 0);

2008

if(ret == -1){

2009

perror_plus("klogctl");

2010

}

2011

}

2012

#endif /* __linux__ */

2013

/* Lower privileges */

2014

errno = 0;

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

2019

}

2841

bool interface_was_up = interface_is_up(interface);

2842

errno = bring_up_interface(interface, delay);

2843

if(not interface_was_up){

2844

if(errno != 0){

2845

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

2846

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

2847

} else {

2848

errno = argz_add(&interfaces_to_take_down,

2849

&interfaces_to_take_down_size,

2850

interface);

2851

if(errno != 0){

2852

perror_plus("argz_add");

2853

}

2854

}

2855

}

2856

}

2857

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

2858

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

2859

}

2860

}

2861

2862

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

2863

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

2864

if(debug){

2865

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

2866

mc.interfaces);

2867

}

2868

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

2020

2869

}

2021

2870

2022

2871

if(quit_now){

2023

2872

goto end;

2024

2873

}

2025

2874

2026

ret = init_gnutls_global(pubkey, seckey);

2875

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

2027

2876

if(ret == -1){

2028

2877

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

2029

2878

exitcode = EX_UNAVAILABLE;

2036

2885

goto end;

2037

2886

}

2038

2887

2039

if(mkdtemp(tempdir) == NULL){

2888

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

2889

tempdir = mkdtemp(run_tempdir);

2890

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

2891

if(debug){

2892

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

2893

run_tempdir, old_tempdir);

2894

}

2895

tempdir = mkdtemp(old_tempdir);

2896

}

2897

if(tempdir == NULL){

2040

2898

perror_plus("mkdtemp");

2041

2899

goto end;

2042

2900

}

2043

tempdir_created = true;

2044

2901

2045

2902

if(quit_now){

2046

2903

goto end;

2047

2904

}

2048

2905

2049

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

2906

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

2050

2907

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

2051

2908

exitcode = EX_UNAVAILABLE;

2052

2909

goto end;

2062

2919

/* Connect directly, do not use Zeroconf */

2063

2920

/* (Mainly meant for debugging) */

2064

2921

char *address = strrchr(connect_to, ':');

2922

2065

2923

if(address == NULL){

2066

2924

fprintf_plus(stderr, "No colon in address\n");

2067

2925

exitcode = EX_USAGE;

2072

2930

goto end;

2073

2931

}

2074

2932

2075

uint16_t port;

2933

in_port_t port;

2076

2934

errno = 0;

2077

2935

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

2078

2936

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

2079

or tmpmax != (uint16_t)tmpmax){

2937

or tmpmax != (in_port_t)tmpmax){

2080

2938

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

2081

2939

exitcode = EX_USAGE;

2082

2940

goto end;

2083

2941

}

2084

2942

2085

2943

if(quit_now){

2086

2944

goto end;

2087

2945

}

2088

2946

2089

port = (uint16_t)tmpmax;

2947

port = (in_port_t)tmpmax;

2090

2948

*address = '\0';

2091

2949

/* Colon in address indicates IPv6 */

2092

2950

int af;

2108

2966

}

2109

2967

2110

2968

while(not quit_now){

2111

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

2969

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

2970

&mc);

2112

2971

if(quit_now or ret == 0){

2113

2972

break;

2114

2973

}

2116

2975

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

2117

2976

(int)retry_interval);

2118

2977

}

2119

sleep((int)retry_interval);

2978

sleep((unsigned int)retry_interval);

2120

2979

}

2121

2980

2122

if (not quit_now){

2981

if(not quit_now){

2123

2982

exitcode = EXIT_SUCCESS;

2124

2983

}

2125

2984

2140

2999

config.publish_domain = 0;

2141

3000

2142

3001

/* Allocate a new server */

2143

mc.server = avahi_server_new(avahi_simple_poll_get

2144

(mc.simple_poll), &config, NULL,

2145

NULL, &error);

3002

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

3003

&config, NULL, NULL, &ret);

2146

3004

2147

3005

/* Free the Avahi configuration data */

2148

3006

avahi_server_config_free(&config);

2151

3009

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

2152

3010

if(mc.server == NULL){

2153

3011

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

2154

avahi_strerror(error));

3012

avahi_strerror(ret));

2155

3013

exitcode = EX_UNAVAILABLE;

2156

3014

goto end;

2157

3015

}

2163

3021

/* Create the Avahi service browser */

2164

3022

sb = avahi_s_service_browser_new(mc.server, if_index,

2165

3023

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2166

NULL, 0, browse_callback, NULL);

3024

NULL, 0, browse_callback,

3025

(void *)&mc);

2167

3026

if(sb == NULL){

2168

3027

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

2169

3028

avahi_strerror(avahi_server_errno(mc.server)));

2180

3039

if(debug){

2181

3040

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

2182

3041

}

2183

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

3042

3043

ret = avahi_loop_with_timeout(simple_poll,

3044

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

2186

3045

if(debug){

2187

3046

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

2188

3047

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

2191

3050

end:

2192

3051

2193

3052

if(debug){

2194

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

3053

if(signal_received){

3054

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

3055

argv[0], signal_received,

3056

strsignal(signal_received));

3057

} else {

3058

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

3059

}

2195

3060

}

2196

3061

2197

3062

/* Cleanup things */

3063

free(mc.interfaces);

3064

2198

3065

if(sb != NULL)

2199

3066

avahi_s_service_browser_free(sb);

2200

3067

2201

3068

if(mc.server != NULL)

2202

3069

avahi_server_free(mc.server);

2203

3070

2204

if(mc.simple_poll != NULL)

2205

avahi_simple_poll_free(mc.simple_poll);

3071

if(simple_poll != NULL)

3072

avahi_simple_poll_free(simple_poll);

2206

3073

2207

3074

if(gnutls_initialized){

2208

3075

gnutls_certificate_free_credentials(mc.cred);

2209

gnutls_global_deinit();

2210

3076

gnutls_dh_params_deinit(mc.dh_params);

2211

3077

}

2212

3078

2220

3086

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

2221

3087

while(mc.current_server != NULL){

2222

3088

server *next = mc.current_server->next;

3089

#ifdef __GNUC__

3090

#pragma GCC diagnostic push

3091

#pragma GCC diagnostic ignored "-Wcast-qual"

3092

#endif

3093

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

3094

#ifdef __GNUC__

3095

#pragma GCC diagnostic pop

3096

#endif

2223

3097

free(mc.current_server);

2224

3098

mc.current_server = next;

2225

3099

}

2226

3100

}

2227

3101

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

3102

/* Re-raise privileges */

2232

3103

{

2233

errno = 0;

2234

ret = seteuid(0);

2235

if(ret == -1){

2236

perror_plus("seteuid");

3104

ret = raise_privileges();

3105

if(ret != 0){

3106

errno = ret;

3107

perror_plus("Failed to raise privileges");

3108

} else {

3109

3110

/* Run network hooks */

3111

run_network_hooks("stop", interfaces_hooks != NULL ?

3112

interfaces_hooks : "", delay);

3113

3114

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

3115

{

3116

char *interface = NULL;

3117

while((interface = argz_next(interfaces_to_take_down,

3118

interfaces_to_take_down_size,

3119

interface))){

3120

ret = take_down_interface(interface);

3121

if(ret != 0){

3122

errno = ret;

3123

perror_plus("Failed to take down interface");

3124

}

3125

}

3126

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

3127

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

3128

" down\n");

3129

}

3130

}

2237

3131

}

2238

3132

2239

/* Take down the network interface */

2240

if(take_down_interface and geteuid() == 0){

2241

ret = ioctl(sd, SIOCGIFFLAGS, &network);

2242

if(ret == -1){

2243

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

2245

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

2246

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

2247

if(ret == -1){

2248

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2249

}

2250

}

2251

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

2252

if(ret == -1){

2253

perror_plus("close");

2254

}

3133

ret = lower_privileges_permanently();

3134

if(ret != 0){

3135

errno = ret;

3136

perror_plus("Failed to lower privileges permanently");

2255

3137

}

2256

3138

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

3139

3140

free(interfaces_to_take_down);

3141

free(interfaces_hooks);

3142

3143

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

3144

uintmax_t level){

3145

struct dirent **direntries = NULL;

3146

int dret;

3147

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

3148

O_RDONLY

3149

| O_NOFOLLOW

3150

| O_DIRECTORY

3151

| O_PATH));

3152

if(dir_fd == -1){

3153

perror_plus("open");

3154

return;

3155

}

3156

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

3157

notdotentries, alphasort);

3158

if(numentries >= 0){

3159

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

3160

if(debug){

3161

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

3162

dirname, direntries[i]->d_name);

3163

}

3164

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

3165

if(dret == -1){

3166

if(errno == EISDIR){

3167

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

3168

AT_REMOVEDIR);

3169

}

3170

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

3171

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

3172

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

3173

/* Recurse only in this special case */

3174

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

3175

dret = 0;

3176

}

3177

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

3178

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

3179

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

3180

}

3181

}

3182

free(direntries[i]);

3183

}

3184

3185

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

3186

free(direntries);

3187

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3188

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

3189

perror_plus("rmdir");

3190

}

3191

} else {

3192

perror_plus("scandirat");

3193

}

3194

close(dir_fd);

2262

3195

}

2263

3196

2264

3197

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

2265

if(tempdir_created){

2266

struct dirent **direntries = NULL;

2267

struct dirent *direntry = NULL;

2268

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

2269

alphasort);

2270

if (numentries > 0){

2271

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

2272

direntry = direntries[i];

2273

char *fullname = NULL;

2274

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

2275

direntry->d_name);

2276

if(ret < 0){

2277

perror_plus("asprintf");

2278

continue;

2279

}

2280

ret = remove(fullname);

2281

if(ret == -1){

2282

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

2283

strerror(errno));

2284

}

2285

free(fullname);

2286

}

2287

}

2288

2289

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

2290

free(direntries);

2291

if (numentries == -1){

2292

perror_plus("scandir");

2293

}

2294

ret = rmdir(tempdir);

2295

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

2296

perror_plus("rmdir");

2297

}

3198

if(tempdir != NULL){

3199

clean_dir_at(-1, tempdir, 0);

2298

3200

}

2299

3201

2300

3202

if(quit_now){