/mandos/release : revision 237.7.471

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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@fukt.bsnet.se>.

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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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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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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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*/

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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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SIOCSIFFLAGS, if_indextoname(),

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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() */

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

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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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raise() */

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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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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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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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#define SECKEY "seckey.txt"

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#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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static const char mandos_protocol_version[] = "1";

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const char *argp_program_version = "mandos-client " VERSION;

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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

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const char *argp_program_bug_address = "<mandos@recompile.se>";

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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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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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struct server *next;

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struct server *prev;

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} server;

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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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168

AvahiServer *server;

137

169

gnutls_certificate_credentials_t cred;

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170

unsigned int dh_bits;

139

171

gnutls_dh_params_t dh_params;

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172

const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

142

177

} mandos_context;

143

178

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

145

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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/* global so signal handler can reach it*/

180

AvahiSimplePoll *simple_poll;

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181

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182

sig_atomic_t quit_now = 0;

150

183

int signal_received = 0;

151

184

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/* Function to use when printing errors */

186

void perror_plus(const char *print_text){

187

int e = errno;

188

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

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program_invocation_short_name);

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errno = e;

191

perror(print_text);

192

}

193

194

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

195

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

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va_list ap;

197

va_start (ap, format);

198

199

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

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program_invocation_short_name));

201

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

202

}

203

152

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/*

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* Make additional room in "buffer" for at least BUFFER_SIZE more

154

206

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

155

207

* "buffer_length" is how much is already used.

156

208

*/

209

__attribute__((nonnull, warn_unused_result))

157

210

size_t incbuffer(char **buffer, size_t buffer_length,

158

size_t buffer_capacity){

211

size_t buffer_capacity){

159

212

if(buffer_length + BUFFER_SIZE > buffer_capacity){

160

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

161

if(buffer == NULL){

213

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

214

if(new_buf == NULL){

215

int old_errno = errno;

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free(*buffer);

217

errno = old_errno;

218

*buffer = NULL;

162

219

return 0;

163

220

}

221

*buffer = new_buf;

164

222

buffer_capacity += BUFFER_SIZE;

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223

}

166

224

return buffer_capacity;

167

225

}

168

226

227

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

228

__attribute__((nonnull, warn_unused_result))

229

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

230

int af, server **current_server){

231

int ret;

232

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

233

if(new_server == NULL){

234

perror_plus("malloc");

235

return false;

236

}

237

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

238

.port = port,

239

.if_index = if_index,

240

.af = af };

241

if(new_server->ip == NULL){

242

perror_plus("strdup");

243

free(new_server);

244

return false;

245

}

246

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

247

if(ret == -1){

248

perror_plus("clock_gettime");

249

#ifdef __GNUC__

250

#pragma GCC diagnostic push

251

#pragma GCC diagnostic ignored "-Wcast-qual"

252

#endif

253

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

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#ifdef __GNUC__

255

#pragma GCC diagnostic pop

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#endif

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free(new_server);

258

return false;

259

}

260

/* Special case of first server */

261

if(*current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

264

*current_server = new_server;

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} else {

266

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

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return true;

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}

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/*

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* Initialize GPGME.

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277

*/

172

static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

278

__attribute__((nonnull, warn_unused_result))

279

static bool init_gpgme(const char * const seckey,

280

const char * const pubkey,

281

const char * const tempdir,

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mandos_context *mc){

174

283

gpgme_error_t rc;

175

284

gpgme_engine_info_t engine_info;

176

285

177

178

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/*

179

287

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

180

288

*/

181

bool import_key(const char *filename){

289

bool import_key(const char * const filename){

182

290

int ret;

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291

int fd;

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gpgme_data_t pgp_data;

185

293

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fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

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295

if(fd == -1){

188

perror("open");

296

perror_plus("open");

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return false;

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}

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

193

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if(rc != GPG_ERR_NO_ERROR){

194

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

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gpgme_strsource(rc), gpgme_strerror(rc));

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

197

305

}

198

306

199

rc = gpgme_op_import(mc.ctx, pgp_data);

307

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

200

308

if(rc != GPG_ERR_NO_ERROR){

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

309

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

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gpgme_strsource(rc), gpgme_strerror(rc));

203

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return false;

204

312

}

205

313

206

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

314

ret = close(fd);

207

315

if(ret == -1){

208

perror("close");

316

perror_plus("close");

209

317

}

210

318

gpgme_data_release(pgp_data);

211

319

return true;

212

320

}

213

321

214

322

if(debug){

215

fprintf(stderr, "Initializing GPGME\n");

323

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

216

324

}

217

325

218

326

/* Init GPGME */

219

327

gpgme_check_version(NULL);

220

328

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

221

329

if(rc != GPG_ERR_NO_ERROR){

222

fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",

223

gpgme_strsource(rc), gpgme_strerror(rc));

330

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

331

gpgme_strsource(rc), gpgme_strerror(rc));

224

332

return false;

225

333

}

226

334

227

/* Set GPGME home directory for the OpenPGP engine only */

335

/* Set GPGME home directory for the OpenPGP engine only */

228

336

rc = gpgme_get_engine_info(&engine_info);

229

337

if(rc != GPG_ERR_NO_ERROR){

230

fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",

231

gpgme_strsource(rc), gpgme_strerror(rc));

338

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

339

gpgme_strsource(rc), gpgme_strerror(rc));

232

340

return false;

233

341

}

234

342

while(engine_info != NULL){

240

348

engine_info = engine_info->next;

241

349

}

242

350

if(engine_info == NULL){

243

fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);

351

fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",

352

tempdir);

244

353

return false;

245

354

}

246

355

247

356

/* Create new GPGME "context" */

248

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

357

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

249

358

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

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

361

gpgme_strerror(rc));

252

362

return false;

253

363

}

254

364

263

373

* Decrypt OpenPGP data.

264

374

* Returns -1 on error

265

375

*/

376

__attribute__((nonnull, warn_unused_result))

266

377

static ssize_t pgp_packet_decrypt(const char *cryptotext,

267

378

size_t crypto_size,

268

char **plaintext){

379

char **plaintext,

380

mandos_context *mc){

269

381

gpgme_data_t dh_crypto, dh_plain;

270

382

gpgme_error_t rc;

271

383

ssize_t ret;

273

385

ssize_t plaintext_length = 0;

274

386

275

387

if(debug){

276

fprintf(stderr, "Trying to decrypt OpenPGP data\n");

388

fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");

277

389

}

278

390

279

391

/* Create new GPGME data buffer from memory cryptotext */

280

392

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

393

0);

282

394

if(rc != GPG_ERR_NO_ERROR){

283

fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",

284

gpgme_strsource(rc), gpgme_strerror(rc));

395

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

396

gpgme_strsource(rc), gpgme_strerror(rc));

285

397

return -1;

286

398

}

287

399

288

400

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

289

401

rc = gpgme_data_new(&dh_plain);

290

402

if(rc != GPG_ERR_NO_ERROR){

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

403

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

404

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

405

gpgme_strsource(rc), gpgme_strerror(rc));

293

406

gpgme_data_release(dh_crypto);

294

407

return -1;

295

408

}

296

409

297

410

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

298

411

data buffer */

299

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

412

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

300

413

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

414

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

415

gpgme_strsource(rc), gpgme_strerror(rc));

303

416

plaintext_length = -1;

304

417

if(debug){

305

418

gpgme_decrypt_result_t result;

306

result = gpgme_op_decrypt_result(mc.ctx);

419

result = gpgme_op_decrypt_result(mc->ctx);

307

420

if(result == NULL){

308

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

421

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

309

422

} else {

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

423

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

424

result->unsupported_algorithm);

425

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

426

result->wrong_key_usage);

314

427

if(result->file_name != NULL){

315

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

428

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

316

429

}

317

430

gpgme_recipient_t recipient;

318

431

recipient = result->recipients;

319

432

while(recipient != NULL){

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

433

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

434

gpgme_pubkey_algo_name

435

(recipient->pubkey_algo));

436

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

437

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

438

recipient->status == GPG_ERR_NO_SECKEY

439

? "No" : "Yes");

326

440

recipient = recipient->next;

327

441

}

328

442

}

331

445

}

332

446

333

447

if(debug){

334

fprintf(stderr, "Decryption of OpenPGP data succeeded\n");

448

fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");

335

449

}

336

450

337

451

/* Seek back to the beginning of the GPGME plaintext data buffer */

338

452

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

339

perror("gpgme_data_seek");

453

perror_plus("gpgme_data_seek");

340

454

plaintext_length = -1;

341

455

goto decrypt_end;

342

456

}

344

458

*plaintext = NULL;

345

459

while(true){

346

460

plaintext_capacity = incbuffer(plaintext,

347

(size_t)plaintext_length,

348

plaintext_capacity);

461

(size_t)plaintext_length,

462

plaintext_capacity);

349

463

if(plaintext_capacity == 0){

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

464

perror_plus("incbuffer");

465

plaintext_length = -1;

466

goto decrypt_end;

353

467

}

354

468

355

469

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

360

474

break;

361

475

}

362

476

if(ret < 0){

363

perror("gpgme_data_read");

477

perror_plus("gpgme_data_read");

364

478

plaintext_length = -1;

365

479

goto decrypt_end;

366

480

}

368

482

}

369

483

370

484

if(debug){

371

fprintf(stderr, "Decrypted password is: ");

485

fprintf_plus(stderr, "Decrypted password is: ");

372

486

for(ssize_t i = 0; i < plaintext_length; i++){

373

487

fprintf(stderr, "%02hhX ", (*plaintext)[i]);

374

488

}

385

499

return plaintext_length;

386

500

}

387

501

388

static const char * safer_gnutls_strerror(int value){

389

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

390

-Wunreachable-code */

391

if(ret == NULL)

392

ret = "(unknown)";

393

return ret;

502

__attribute__((warn_unused_result, const))

503

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

504

if(str == NULL)

505

return "(unknown)";

506

return str;

507

}

508

509

__attribute__((warn_unused_result))

510

static const char *safer_gnutls_strerror(int value){

511

const char *ret = gnutls_strerror(value);

512

return safe_string(ret);

394

513

}

395

514

396

515

/* GnuTLS log function callback */

516

__attribute__((nonnull))

397

517

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

398

518

const char* string){

399

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

519

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

400

520

}

401

521

522

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

402

523

static int init_gnutls_global(const char *pubkeyfilename,

403

const char *seckeyfilename){

524

const char *seckeyfilename,

525

const char *dhparamsfilename,

526

mandos_context *mc){

404

527

int ret;

528

unsigned int uret;

405

529

406

530

if(debug){

407

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

408

}

409

410

ret = gnutls_global_init();

411

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

414

return -1;

531

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

415

532

}

416

533

417

534

if(debug){

423

540

}

424

541

425

542

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

543

ret = gnutls_certificate_allocate_credentials(&mc->cred);

427

544

if(ret != GNUTLS_E_SUCCESS){

428

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

433

gnutls_global_deinit();

545

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

546

safer_gnutls_strerror(ret));

434

547

return -1;

435

548

}

436

549

437

550

if(debug){

438

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

439

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

440

seckeyfilename);

551

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

552

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

553

pubkeyfilename,

554

seckeyfilename);

441

555

}

442

556

443

557

ret = gnutls_certificate_set_openpgp_key_file

444

(mc.cred, pubkeyfilename, seckeyfilename,

558

(mc->cred, pubkeyfilename, seckeyfilename,

445

559

GNUTLS_OPENPGP_FMT_BASE64);

446

560

if(ret != GNUTLS_E_SUCCESS){

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

561

fprintf_plus(stderr,

562

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

563

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

564

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

565

safer_gnutls_strerror(ret));

452

566

goto globalfail;

453

567

}

454

568

455

569

/* GnuTLS server initialization */

456

ret = gnutls_dh_params_init(&mc.dh_params);

457

if(ret != GNUTLS_E_SUCCESS){

458

fprintf(stderr, "Error in GnuTLS DH parameter initialization:"

459

" %s\n", safer_gnutls_strerror(ret));

460

goto globalfail;

461

}

462

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

463

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

466

goto globalfail;

467

}

468

469

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

570

ret = gnutls_dh_params_init(&mc->dh_params);

571

if(ret != GNUTLS_E_SUCCESS){

572

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

573

" initialization: %s\n",

574

safer_gnutls_strerror(ret));

575

goto globalfail;

576

}

577

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

578

if(dhparamsfilename != NULL){

579

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

580

do {

581

int dhpfile = open(dhparamsfilename, O_RDONLY);

582

if(dhpfile == -1){

583

perror_plus("open");

584

dhparamsfilename = NULL;

585

break;

586

}

587

size_t params_capacity = 0;

588

while(true){

589

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

590

(size_t)params.size,

591

(size_t)params_capacity);

592

if(params_capacity == 0){

593

perror_plus("incbuffer");

594

free(params.data);

595

params.data = NULL;

596

dhparamsfilename = NULL;

597

break;

598

}

599

ssize_t bytes_read = read(dhpfile,

600

params.data + params.size,

601

BUFFER_SIZE);

602

/* EOF */

603

if(bytes_read == 0){

604

break;

605

}

606

/* check bytes_read for failure */

607

if(bytes_read < 0){

608

perror_plus("read");

609

free(params.data);

610

params.data = NULL;

611

dhparamsfilename = NULL;

612

break;

613

}

614

params.size += (unsigned int)bytes_read;

615

}

616

if(params.data == NULL){

617

dhparamsfilename = NULL;

618

}

619

if(dhparamsfilename == NULL){

620

break;

621

}

622

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

623

GNUTLS_X509_FMT_PEM);

624

if(ret != GNUTLS_E_SUCCESS){

625

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

626

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

627

safer_gnutls_strerror(ret));

628

dhparamsfilename = NULL;

629

}

630

free(params.data);

631

} while(false);

632

}

633

if(dhparamsfilename == NULL){

634

if(mc->dh_bits == 0){

635

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

636

/* Try to read the private key file */

637

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

638

do {

639

int secfile = open(seckeyfilename, O_RDONLY);

640

if(secfile == -1){

641

perror_plus("open");

642

break;

643

}

644

size_t buffer_capacity = 0;

645

while(true){

646

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

647

(size_t)buffer.size,

648

(size_t)buffer_capacity);

649

if(buffer_capacity == 0){

650

perror_plus("incbuffer");

651

free(buffer.data);

652

buffer.data = NULL;

653

break;

654

}

655

ssize_t bytes_read = read(secfile,

656

buffer.data + buffer.size,

657

BUFFER_SIZE);

658

/* EOF */

659

if(bytes_read == 0){

660

break;

661

}

662

/* check bytes_read for failure */

663

if(bytes_read < 0){

664

perror_plus("read");

665

free(buffer.data);

666

buffer.data = NULL;

667

break;

668

}

669

buffer.size += (unsigned int)bytes_read;

670

}

671

close(secfile);

672

} while(false);

673

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

674

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

675

if(buffer.data != NULL){

676

{

677

gnutls_openpgp_privkey_t privkey = NULL;

678

ret = gnutls_openpgp_privkey_init(&privkey);

679

if(ret != GNUTLS_E_SUCCESS){

680

fprintf_plus(stderr, "Error initializing OpenPGP key"

681

" structure: %s",

682

safer_gnutls_strerror(ret));

683

free(buffer.data);

684

buffer.data = NULL;

685

} else {

686

ret = gnutls_openpgp_privkey_import

687

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

688

if(ret != GNUTLS_E_SUCCESS){

689

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

690

safer_gnutls_strerror(ret));

691

privkey = NULL;

692

}

693

free(buffer.data);

694

buffer.data = NULL;

695

if(privkey != NULL){

696

/* Use private key to suggest an appropriate

697

sec_param */

698

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

699

gnutls_openpgp_privkey_deinit(privkey);

700

if(debug){

701

fprintf_plus(stderr, "This OpenPGP key implies using"

702

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

703

safe_string(gnutls_sec_param_get_name

704

(sec_param)));

705

}

706

}

707

}

708

}

709

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

710

/* Err on the side of caution */

711

sec_param = GNUTLS_SEC_PARAM_ULTRA;

712

if(debug){

713

fprintf_plus(stderr, "Falling back to security parameter"

714

" \"%s\"\n",

715

safe_string(gnutls_sec_param_get_name

716

(sec_param)));

717

}

718

}

719

}

720

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

721

if(uret != 0){

722

mc->dh_bits = uret;

723

if(debug){

724

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

725

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

726

safe_string(gnutls_sec_param_get_name

727

(sec_param)),

728

mc->dh_bits);

729

}

730

} else {

731

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

732

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

733

safe_string(gnutls_sec_param_get_name

734

(sec_param)),

735

safer_gnutls_strerror(ret));

736

goto globalfail;

737

}

738

} else if(debug){

739

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

740

mc->dh_bits);

741

}

742

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

743

if(ret != GNUTLS_E_SUCCESS){

744

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

745

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

746

safer_gnutls_strerror(ret));

747

goto globalfail;

748

}

749

}

750

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

470

751

471

752

return 0;

472

753

473

754

globalfail:

474

755

475

gnutls_certificate_free_credentials(mc.cred);

476

gnutls_global_deinit();

477

gnutls_dh_params_deinit(mc.dh_params);

756

gnutls_certificate_free_credentials(mc->cred);

757

gnutls_dh_params_deinit(mc->dh_params);

478

758

return -1;

479

759

}

480

760

481

static int init_gnutls_session(gnutls_session_t *session){

761

__attribute__((nonnull, warn_unused_result))

762

static int init_gnutls_session(gnutls_session_t *session,

763

mandos_context *mc){

482

764

int ret;

483

765

/* GnuTLS session creation */

484

766

do {

488

770

}

489

771

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

490

772

if(ret != GNUTLS_E_SUCCESS){

491

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

492

safer_gnutls_strerror(ret));

773

fprintf_plus(stderr,

774

"Error in GnuTLS session initialization: %s\n",

775

safer_gnutls_strerror(ret));

493

776

}

494

777

495

778

{

496

779

const char *err;

497

780

do {

498

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

781

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

499

782

if(quit_now){

500

783

gnutls_deinit(*session);

501

784

return -1;

502

785

}

503

786

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

504

787

if(ret != GNUTLS_E_SUCCESS){

505

fprintf(stderr, "Syntax error at: %s\n", err);

506

fprintf(stderr, "GnuTLS error: %s\n",

507

safer_gnutls_strerror(ret));

788

fprintf_plus(stderr, "Syntax error at: %s\n", err);

789

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

790

safer_gnutls_strerror(ret));

508

791

gnutls_deinit(*session);

509

792

return -1;

510

793

}

512

795

513

796

do {

514

797

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

515

mc.cred);

798

mc->cred);

516

799

if(quit_now){

517

800

gnutls_deinit(*session);

518

801

return -1;

519

802

}

520

803

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

521

804

if(ret != GNUTLS_E_SUCCESS){

522

fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

523

safer_gnutls_strerror(ret));

805

fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",

806

safer_gnutls_strerror(ret));

524

807

gnutls_deinit(*session);

525

808

return -1;

526

809

}

528

811

/* ignore client certificate if any. */

529

812

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

530

813

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

532

533

814

return 0;

534

815

}

535

816

537

818

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

538

819

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

539

820

821

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

822

__attribute__((warn_unused_result))

823

int raise_privileges(void){

824

int old_errno = errno;

825

int ret = 0;

826

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

827

ret = errno;

828

}

829

errno = old_errno;

830

return ret;

831

}

832

833

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

834

__attribute__((warn_unused_result))

835

int raise_privileges_permanently(void){

836

int old_errno = errno;

837

int ret = raise_privileges();

838

if(ret != 0){

839

errno = old_errno;

840

return ret;

841

}

842

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

843

ret = errno;

844

}

845

errno = old_errno;

846

return ret;

847

}

848

849

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

850

__attribute__((warn_unused_result))

851

int lower_privileges(void){

852

int old_errno = errno;

853

int ret = 0;

854

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

855

ret = errno;

856

}

857

errno = old_errno;

858

return ret;

859

}

860

861

/* Lower privileges permanently */

862

__attribute__((warn_unused_result))

863

int lower_privileges_permanently(void){

864

int old_errno = errno;

865

int ret = 0;

866

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

867

ret = errno;

868

}

869

errno = old_errno;

870

return ret;

871

}

872

873

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

874

__attribute__((nonnull, warn_unused_result))

875

static bool add_delete_local_route(const bool add,

876

const char *address,

877

AvahiIfIndex if_index){

878

int ret;

879

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

880

char add_arg[] = "add";

881

char delete_arg[] = "delete";

882

char debug_flag[] = "--debug";

883

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

884

if(pluginhelperdir == NULL){

885

if(debug){

886

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

887

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

888

}

889

return false;

890

}

891

892

char interface[IF_NAMESIZE];

893

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

894

perror_plus("if_indextoname");

895

return false;

896

}

897

898

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

899

if(devnull == -1){

900

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

901

return false;

902

}

903

pid_t pid = fork();

904

if(pid == 0){

905

/* Child */

906

/* Raise privileges */

907

errno = raise_privileges_permanently();

908

if(errno != 0){

909

perror_plus("Failed to raise privileges");

910

/* _exit(EX_NOPERM); */

911

} else {

912

/* Set group */

913

errno = 0;

914

ret = setgid(0);

915

if(ret == -1){

916

perror_plus("setgid");

917

_exit(EX_NOPERM);

918

}

919

/* Reset supplementary groups */

920

errno = 0;

921

ret = setgroups(0, NULL);

922

if(ret == -1){

923

perror_plus("setgroups");

924

_exit(EX_NOPERM);

925

}

926

}

927

ret = dup2(devnull, STDIN_FILENO);

928

if(ret == -1){

929

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

930

_exit(EX_OSERR);

931

}

932

ret = close(devnull);

933

if(ret == -1){

934

perror_plus("close");

935

_exit(EX_OSERR);

936

}

937

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

938

if(ret == -1){

939

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

940

_exit(EX_OSERR);

941

}

942

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

943

O_RDONLY

944

| O_DIRECTORY

945

| O_PATH

946

| O_CLOEXEC));

947

if(helperdir_fd == -1){

948

perror_plus("open");

949

_exit(EX_UNAVAILABLE);

950

}

951

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

952

helper, O_RDONLY));

953

if(helper_fd == -1){

954

perror_plus("openat");

955

close(helperdir_fd);

956

_exit(EX_UNAVAILABLE);

957

}

958

close(helperdir_fd);

959

#ifdef __GNUC__

960

#pragma GCC diagnostic push

961

#pragma GCC diagnostic ignored "-Wcast-qual"

962

#endif

963

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

964

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

965

interface, debug ? debug_flag : NULL, NULL },

966

environ) == -1){

967

#ifdef __GNUC__

968

#pragma GCC diagnostic pop

969

#endif

970

perror_plus("fexecve");

971

_exit(EXIT_FAILURE);

972

}

973

}

974

if(pid == -1){

975

perror_plus("fork");

976

return false;

977

}

978

int status;

979

pid_t pret = -1;

980

errno = 0;

981

do {

982

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

983

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

984

int errno_raising = 0;

985

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

986

errno_raising = errno;

987

perror_plus("Failed to raise privileges in order to"

988

" kill helper program");

989

}

990

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

991

perror_plus("kill");

992

}

993

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

994

perror_plus("Failed to lower privileges after killing"

995

" helper program");

996

}

997

return false;

998

}

999

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

1000

if(pret == -1){

1001

perror_plus("waitpid");

1002

return false;

1003

}

1004

if(WIFEXITED(status)){

1005

if(WEXITSTATUS(status) != 0){

1006

fprintf_plus(stderr, "Error: iprouteadddel exited"

1007

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

1008

return false;

1009

}

1010

return true;

1011

}

1012

if(WIFSIGNALED(status)){

1013

fprintf_plus(stderr, "Error: iprouteadddel died by"

1014

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

1015

return false;

1016

}

1017

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

1018

return false;

1019

}

1020

1021

__attribute__((nonnull, warn_unused_result))

1022

static bool add_local_route(const char *address,

1023

AvahiIfIndex if_index){

1024

if(debug){

1025

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

1026

}

1027

return add_delete_local_route(true, address, if_index);

1028

}

1029

1030

__attribute__((nonnull, warn_unused_result))

1031

static bool delete_local_route(const char *address,

1032

AvahiIfIndex if_index){

1033

if(debug){

1034

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

1035

}

1036

return add_delete_local_route(false, address, if_index);

1037

}

1038

540

1039

/* Called when a Mandos server is found */

541

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

1040

__attribute__((nonnull, warn_unused_result))

1041

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

542

1042

AvahiIfIndex if_index,

543

int af){

1043

int af, mandos_context *mc){

544

1044

int ret, tcp_sd = -1;

545

1045

ssize_t sret;

546

union {

547

struct sockaddr_in in;

548

struct sockaddr_in6 in6;

549

} to;

1046

struct sockaddr_storage to;

550

1047

char *buffer = NULL;

551

1048

char *decrypted_buffer = NULL;

552

1049

size_t buffer_length = 0;

555

1052

int retval = -1;

556

1053

gnutls_session_t session;

557

1054

int pf; /* Protocol family */

1055

bool route_added = false;

558

1056

559

1057

errno = 0;

560

1058

571

1069

pf = PF_INET;

572

1070

break;

573

1071

default:

574

fprintf(stderr, "Bad address family: %d\n", af);

1072

fprintf_plus(stderr, "Bad address family: %d\n", af);

575

1073

errno = EINVAL;

576

1074

return -1;

577

1075

}

578

1076

579

ret = init_gnutls_session(&session);

1077

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

1078

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

1079

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

1080

bool match = false;

1081

{

1082

char *interface = NULL;

1083

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

1084

mc->interfaces_size,

1085

interface))){

1086

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

1087

match = true;

1088

break;

1089

}

1090

}

1091

}

1092

if(not match){

1093

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

1094

connect to the server */

1095

if(debug){

1096

char interface[IF_NAMESIZE];

1097

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

1098

perror_plus("if_indextoname");

1099

} else {

1100

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

1101

" \"%s\"\n",

1102

if_indextoname((unsigned int)if_index,

1103

interface));

1104

}

1105

}

1106

return -1;

1107

}

1108

}

1109

1110

ret = init_gnutls_session(&session, mc);

580

1111

if(ret != 0){

581

1112

return -1;

582

1113

}

583

1114

584

1115

if(debug){

585

fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16

586

"\n", ip, port);

1116

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

1117

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

587

1118

}

588

1119

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

1120

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

590

1121

if(tcp_sd < 0){

591

1122

int e = errno;

592

perror("socket");

1123

perror_plus("socket");

593

1124

errno = e;

594

1125

goto mandos_end;

595

1126

}

599

1130

goto mandos_end;

600

1131

}

601

1132

602

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

603

1133

if(af == AF_INET6){

604

to.in6.sin6_family = (sa_family_t)af;

605

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

1134

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

1135

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

1136

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

606

1137

} else { /* IPv4 */

607

to.in.sin_family = (sa_family_t)af;

608

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

1138

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

1139

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

1140

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

609

1141

}

610

1142

if(ret < 0 ){

611

1143

int e = errno;

612

perror("inet_pton");

1144

perror_plus("inet_pton");

613

1145

errno = e;

614

1146

goto mandos_end;

615

1147

}

616

1148

if(ret == 0){

617

1149

int e = errno;

618

fprintf(stderr, "Bad address: %s\n", ip);

1150

fprintf_plus(stderr, "Bad address: %s\n", ip);

619

1151

errno = e;

620

1152

goto mandos_end;

621

1153

}

622

1154

if(af == AF_INET6){

623

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

624

-Wconversion and

625

-Wunreachable-code */

626

627

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

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

629

-Wunreachable-code*/

1155

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

1156

if(IN6_IS_ADDR_LINKLOCAL

1157

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

630

1158

if(if_index == AVAHI_IF_UNSPEC){

631

fprintf(stderr, "An IPv6 link-local address is incomplete"

632

" without a network interface\n");

1159

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

1160

" incomplete without a network interface\n");

633

1161

errno = EINVAL;

634

1162

goto mandos_end;

635

1163

}

636

1164

/* Set the network interface number as scope */

637

to.in6.sin6_scope_id = (uint32_t)if_index;

1165

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

638

1166

}

639

1167

} else {

640

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

641

-Wconversion and

642

-Wunreachable-code */

1168

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

643

1169

}

644

1170

645

1171

if(quit_now){

651

1177

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

652

1178

char interface[IF_NAMESIZE];

653

1179

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

654

perror("if_indextoname");

1180

perror_plus("if_indextoname");

655

1181

} else {

656

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

657

ip, interface, port);

1182

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

1183

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

658

1184

}

659

1185

} else {

660

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

661

port);

1186

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

1187

ip, (uintmax_t)port);

662

1188

}

663

1189

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

1190

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

665

const char *pcret;

666

if(af == AF_INET6){

667

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

668

sizeof(addrstr));

669

} else {

670

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

671

sizeof(addrstr));

672

}

673

if(pcret == NULL){

674

perror("inet_ntop");

675

} else {

676

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

677

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

678

}

679

}

680

}

681

682

if(quit_now){

683

errno = EINTR;

684

goto mandos_end;

685

}

686

687

if(af == AF_INET6){

688

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

689

} else {

690

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

691

}

692

if(ret < 0){

693

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

694

int e = errno;

695

perror("connect");

696

errno = e;

697

}

698

goto mandos_end;

699

}

700

701

if(quit_now){

702

errno = EINTR;

703

goto mandos_end;

1191

if(af == AF_INET6){

1192

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

1193

sizeof(struct sockaddr_in6),

1194

addrstr, sizeof(addrstr), NULL, 0,

1195

NI_NUMERICHOST);

1196

} else {

1197

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

1198

sizeof(struct sockaddr_in),

1199

addrstr, sizeof(addrstr), NULL, 0,

1200

NI_NUMERICHOST);

1201

}

1202

if(ret == EAI_SYSTEM){

1203

perror_plus("getnameinfo");

1204

} else if(ret != 0) {

1205

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

1206

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

1207

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

1208

}

1209

}

1210

1211

if(quit_now){

1212

errno = EINTR;

1213

goto mandos_end;

1214

}

1215

1216

while(true){

1217

if(af == AF_INET6){

1218

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

1219

sizeof(struct sockaddr_in6));

1220

} else {

1221

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

1222

sizeof(struct sockaddr_in));

1223

}

1224

if(ret < 0){

1225

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

1226

and if_index != AVAHI_IF_UNSPEC

1227

and connect_to == NULL

1228

and not route_added and

1229

((af == AF_INET6 and not

1230

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1231

&to)->sin6_addr)))

1232

or (af == AF_INET and

1233

/* Not a a IPv4LL address */

1234

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

1235

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

1236

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

1237

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

1238

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

1239

connect to a Mandos server announced by Avahi on a server

1240

host with a global address. Work around this by retrying

1241

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

1242

1243

Avahi bug reference:

1244

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

1245

https://bugs.debian.org/587961

1246

*/

1247

if(debug){

1248

fprintf_plus(stderr, "Mandos server unreachable, trying"

1249

" direct route\n");

1250

}

1251

int e = errno;

1252

route_added = add_local_route(ip, if_index);

1253

if(route_added){

1254

continue;

1255

}

1256

errno = e;

1257

}

1258

if(errno != ECONNREFUSED or debug){

1259

int e = errno;

1260

perror_plus("connect");

1261

errno = e;

1262

}

1263

goto mandos_end;

1264

}

1265

1266

if(quit_now){

1267

errno = EINTR;

1268

goto mandos_end;

1269

}

1270

break;

704

1271

}

705

1272

706

1273

const char *out = mandos_protocol_version;

708

1275

while(true){

709

1276

size_t out_size = strlen(out);

710

1277

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

711

out_size - written));

1278

out_size - written));

712

1279

if(ret == -1){

713

1280

int e = errno;

714

perror("write");

1281

perror_plus("write");

715

1282

errno = e;

716

1283

goto mandos_end;

717

1284

}

734

1301

}

735

1302

736

1303

if(debug){

737

fprintf(stderr, "Establishing TLS session with %s\n", ip);

1304

fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);

738

1305

}

739

1306

740

1307

if(quit_now){

742

1309

goto mandos_end;

743

1310

}

744

1311

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1312

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

1313

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

1314

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

1315

gnutls_transport_set_ptr(session,

1316

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

746

1317

747

1318

if(quit_now){

748

1319

errno = EINTR;

759

1330

760

1331

if(ret != GNUTLS_E_SUCCESS){

761

1332

if(debug){

762

fprintf(stderr, "*** GnuTLS Handshake failed ***\n");

1333

fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");

763

1334

gnutls_perror(ret);

764

1335

}

765

1336

errno = EPROTO;

769

1340

/* Read OpenPGP packet that contains the wanted password */

770

1341

771

1342

if(debug){

772

fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",

773

ip);

1343

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1344

" %s\n", ip);

774

1345

}

775

1346

776

1347

while(true){

781

1352

}

782

1353

783

1354

buffer_capacity = incbuffer(&buffer, buffer_length,

784

buffer_capacity);

1355

buffer_capacity);

785

1356

if(buffer_capacity == 0){

786

1357

int e = errno;

787

perror("incbuffer");

1358

perror_plus("incbuffer");

788

1359

errno = e;

789

1360

goto mandos_end;

790

1361

}

814

1385

}

815

1386

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

816

1387

if(ret < 0){

817

fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

1388

fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "

1389

"***\n");

818

1390

gnutls_perror(ret);

819

1391

errno = EPROTO;

820

1392

goto mandos_end;

821

1393

}

822

1394

break;

823

1395

default:

824

fprintf(stderr, "Unknown error while reading data from"

825

" encrypted session with Mandos server\n");

1396

fprintf_plus(stderr, "Unknown error while reading data from"

1397

" encrypted session with Mandos server\n");

826

1398

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

1399

errno = EIO;

828

1400

goto mandos_end;

833

1405

}

834

1406

835

1407

if(debug){

836

fprintf(stderr, "Closing TLS session\n");

1408

fprintf_plus(stderr, "Closing TLS session\n");

837

1409

}

838

1410

839

1411

if(quit_now){

851

1423

852

1424

if(buffer_length > 0){

853

1425

ssize_t decrypted_buffer_size;

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

buffer_length,

856

&decrypted_buffer);

1426

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1427

&decrypted_buffer, mc);

857

1428

if(decrypted_buffer_size >= 0){

858

1429

1430

clearerr(stdout);

859

1431

written = 0;

860

1432

while(written < (size_t) decrypted_buffer_size){

861

1433

if(quit_now){

869

1441

if(ret == 0 and ferror(stdout)){

870

1442

int e = errno;

871

1443

if(debug){

872

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

873

strerror(errno));

1444

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

1445

strerror(errno));

874

1446

}

875

1447

errno = e;

876

1448

goto mandos_end;

877

1449

}

878

1450

written += (size_t)ret;

879

1451

}

1452

ret = fflush(stdout);

1453

if(ret != 0){

1454

int e = errno;

1455

if(debug){

1456

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

1457

strerror(errno));

1458

}

1459

errno = e;

1460

goto mandos_end;

1461

}

880

1462

retval = 0;

881

1463

}

882

1464

}

885

1467

886

1468

mandos_end:

887

1469

{

1470

if(route_added){

1471

if(not delete_local_route(ip, if_index)){

1472

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

1473

" interface %d", ip, if_index);

1474

}

1475

}

888

1476

int e = errno;

889

1477

free(decrypted_buffer);

890

1478

free(buffer);

891

1479

if(tcp_sd >= 0){

892

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

1480

ret = close(tcp_sd);

893

1481

}

894

1482

if(ret == -1){

895

1483

if(e == 0){

896

1484

e = errno;

897

1485

}

898

perror("close");

1486

perror_plus("close");

899

1487

}

900

1488

gnutls_deinit(session);

1489

errno = e;

901

1490

if(quit_now){

902

e = EINTR;

1491

errno = EINTR;

903

1492

retval = -1;

904

1493

}

905

errno = e;

906

1494

}

907

1495

return retval;

908

1496

}

920

1508

AVAHI_GCC_UNUSED AvahiStringList *txt,

921

1509

AVAHI_GCC_UNUSED AvahiLookupResultFlags

922

1510

flags,

923

AVAHI_GCC_UNUSED void* userdata){

924

assert(r);

1511

void *mc){

1512

if(r == NULL){

1513

return;

1514

}

925

1515

926

1516

/* Called whenever a service has been resolved successfully or

927

1517

timed out */

928

1518

929

1519

if(quit_now){

1520

avahi_s_service_resolver_free(r);

930

1521

return;

931

1522

}

932

1523

933

1524

switch(event){

934

1525

default:

935

1526

case AVAHI_RESOLVER_FAILURE:

936

fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"

937

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

938

avahi_strerror(avahi_server_errno(mc.server)));

1527

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

1528

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

1529

domain,

1530

avahi_strerror(avahi_server_errno

1531

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

939

1532

break;

940

1533

941

1534

case AVAHI_RESOLVER_FOUND:

943

1536

char ip[AVAHI_ADDRESS_STR_MAX];

944

1537

avahi_address_snprint(ip, sizeof(ip), address);

945

1538

if(debug){

946

fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"

947

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

948

ip, (intmax_t)interface, port);

1539

fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"

1540

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

1541

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

949

1542

}

950

int ret = start_mandos_communication(ip, port, interface,

951

avahi_proto_to_af(proto));

1543

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

1544

interface,

1545

avahi_proto_to_af(proto),

1546

mc);

952

1547

if(ret == 0){

953

avahi_simple_poll_quit(mc.simple_poll);

1548

avahi_simple_poll_quit(simple_poll);

1549

} else {

1550

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

1551

avahi_proto_to_af(proto),

1552

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

1553

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

1554

" list\n", name);

1555

}

954

1556

}

955

1557

}

956

1558

}

966

1568

const char *domain,

967

1569

AVAHI_GCC_UNUSED AvahiLookupResultFlags

968

1570

flags,

969

AVAHI_GCC_UNUSED void* userdata){

970

assert(b);

1571

void *mc){

1572

if(b == NULL){

1573

return;

1574

}

971

1575

972

1576

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

973

1577

is removed from the LAN */

980

1584

default:

981

1585

case AVAHI_BROWSER_FAILURE:

982

1586

983

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

984

avahi_strerror(avahi_server_errno(mc.server)));

985

avahi_simple_poll_quit(mc.simple_poll);

1587

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

1588

avahi_strerror(avahi_server_errno

1589

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

1590

avahi_simple_poll_quit(simple_poll);

986

1591

return;

987

1592

988

1593

case AVAHI_BROWSER_NEW:

991

1596

the callback function is called the Avahi server will free the

992

1597

resolver for us. */

993

1598

994

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

995

name, type, domain, protocol, 0,

996

resolve_callback, NULL) == NULL)

997

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

998

name, avahi_strerror(avahi_server_errno(mc.server)));

1599

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

1600

interface, protocol, name, type,

1601

domain, protocol, 0,

1602

resolve_callback, mc) == NULL)

1603

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

1604

" %s\n", name,

1605

avahi_strerror(avahi_server_errno

1606

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

999

1607

break;

1000

1608

1001

1609

case AVAHI_BROWSER_REMOVE:

1004

1612

case AVAHI_BROWSER_ALL_FOR_NOW:

1005

1613

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1006

1614

if(debug){

1007

fprintf(stderr, "No Mandos server found, still searching...\n");

1615

fprintf_plus(stderr, "No Mandos server found, still"

1616

" searching...\n");

1008

1617

}

1009

1618

break;

1010

1619

}

1011

1620

}

1012

1621

1013

/* stop main loop after sigterm has been called */

1622

/* Signal handler that stops main loop after SIGTERM */

1014

1623

static void handle_sigterm(int sig){

1015

1624

if(quit_now){

1016

1625

return;

1018

1627

quit_now = 1;

1019

1628

signal_received = sig;

1020

1629

int old_errno = errno;

1021

if(mc.simple_poll != NULL){

1022

avahi_simple_poll_quit(mc.simple_poll);

1630

/* set main loop to exit */

1631

if(simple_poll != NULL){

1632

avahi_simple_poll_quit(simple_poll);

1023

1633

}

1024

1634

errno = old_errno;

1025

1635

}

1026

1636

1637

__attribute__((nonnull, warn_unused_result))

1638

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

1639

int ret;

1640

int old_errno;

1641

1642

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

1643

if(s < 0){

1644

old_errno = errno;

1645

perror_plus("socket");

1646

errno = old_errno;

1647

return false;

1648

}

1649

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

1650

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

1651

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1652

if(ret == -1){

1653

if(debug){

1654

old_errno = errno;

1655

perror_plus("ioctl SIOCGIFFLAGS");

1656

errno = old_errno;

1657

}

1658

return false;

1659

}

1660

return true;

1661

}

1662

1663

__attribute__((nonnull, warn_unused_result))

1664

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

1665

1666

/* Reject the loopback device */

1667

if(ifr->ifr_flags & IFF_LOOPBACK){

1668

if(debug){

1669

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

1670

ifname);

1671

}

1672

return false;

1673

}

1674

/* Accept point-to-point devices only if connect_to is specified */

1675

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1676

if(debug){

1677

fprintf_plus(stderr, "Accepting point-to-point interface"

1678

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

1679

}

1680

return true;

1681

}

1682

/* Otherwise, reject non-broadcast-capable devices */

1683

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1684

if(debug){

1685

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1686

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

1687

}

1688

return false;

1689

}

1690

/* Reject non-ARP interfaces (including dummy interfaces) */

1691

if(ifr->ifr_flags & IFF_NOARP){

1692

if(debug){

1693

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

1694

ifname);

1695

}

1696

return false;

1697

}

1698

1699

/* Accept this device */

1700

if(debug){

1701

fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);

1702

}

1703

return true;

1704

}

1705

1027

1706

/*

1028

1707

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

1029

1708

* corresponds to an acceptable network device.

1030

1709

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

1031

1710

*/

1711

__attribute__((nonnull, warn_unused_result))

1032

1712

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

1713

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

1042

1714

return 0;

1043

1715

}

1044

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1050

/* read line from flags_fd */

1051

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1052

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1053

flagstring[(size_t)to_read] = '\0';

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1716

1717

struct ifreq ifr;

1718

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

1719

if(debug){

1720

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

1721

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

1722

}

1723

return 0;

1724

}

1725

1726

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

1727

return 0;

1728

}

1729

return 1;

1730

}

1731

1732

/*

1733

* This function determines if a network interface is up.

1734

*/

1735

__attribute__((nonnull, warn_unused_result))

1736

bool interface_is_up(const char *interface){

1737

struct ifreq ifr;

1738

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

1739

if(debug){

1740

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

1741

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

1742

}

1743

return false;

1744

}

1745

1746

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

1747

}

1748

1749

/*

1750

* This function determines if a network interface is running

1751

*/

1752

__attribute__((nonnull, warn_unused_result))

1753

bool interface_is_running(const char *interface){

1754

struct ifreq ifr;

1755

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

1756

if(debug){

1757

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

1758

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

1759

}

1760

return false;

1761

}

1762

1763

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

1764

}

1765

1766

__attribute__((nonnull, pure, warn_unused_result))

1767

int notdotentries(const struct dirent *direntry){

1768

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

1769

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

1770

and (direntry->d_name[1] == '\0'

1771

or (direntry->d_name[1] == '.'

1772

and direntry->d_name[2] == '\0'))){

1773

return 0;

1774

}

1775

return 1;

1776

}

1777

1778

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

1779

__attribute__((nonnull, warn_unused_result))

1780

int runnable_hook(const struct dirent *direntry){

1781

int ret;

1782

size_t sret;

1783

struct stat st;

1784

1785

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

1786

/* Empty name? */

1787

return 0;

1788

}

1789

1790

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

1791

"abcdefghijklmnopqrstuvwxyz"

1792

"0123456789"

1793

"_.-");

1794

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

1795

/* Contains non-allowed characters */

1796

if(debug){

1797

fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",

1798

direntry->d_name);

1799

}

1800

return 0;

1801

}

1802

1803

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

1804

if(ret == -1){

1805

if(debug){

1806

perror_plus("Could not stat hook");

1807

}

1808

return 0;

1809

}

1810

if(not (S_ISREG(st.st_mode))){

1811

/* Not a regular file */

1812

if(debug){

1813

fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",

1814

direntry->d_name);

1815

}

1816

return 0;

1817

}

1818

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1819

/* Not executable */

1820

if(debug){

1821

fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",

1822

direntry->d_name);

1823

}

1824

return 0;

1825

}

1826

if(debug){

1827

fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",

1828

direntry->d_name);

1829

}

1830

return 1;

1831

}

1832

1833

__attribute__((nonnull, warn_unused_result))

1834

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1835

mandos_context *mc){

1836

int ret;

1837

struct timespec now;

1838

struct timespec waited_time;

1839

intmax_t block_time;

1840

1841

while(true){

1842

if(mc->current_server == NULL){

1843

if(debug){

1844

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

1845

" No timeout!\n");

1846

}

1847

ret = avahi_simple_poll_iterate(s, -1);

1848

} else {

1849

if(debug){

1850

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

1851

" it, or wait\n");

1852

}

1853

/* the current time */

1854

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1855

if(ret == -1){

1856

perror_plus("clock_gettime");

1857

return -1;

1858

}

1859

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

1860

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

1861

waited_time.tv_sec = (now.tv_sec

1862

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

1863

waited_time.tv_nsec = (now.tv_nsec

1864

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

1865

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

1866

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

1867

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

1868

block_time = ((retry_interval

1869

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

1870

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

1871

1872

if(debug){

1873

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

1874

block_time);

1875

}

1876

1877

if(block_time <= 0){

1878

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

1879

mc->current_server->port,

1880

mc->current_server->if_index,

1881

mc->current_server->af, mc);

1882

if(ret == 0){

1883

avahi_simple_poll_quit(s);

1884

return 0;

1885

}

1886

ret = clock_gettime(CLOCK_MONOTONIC,

1887

&mc->current_server->last_seen);

1888

if(ret == -1){

1889

perror_plus("clock_gettime");

1890

return -1;

1891

}

1892

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

1893

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

1894

servers, but don't block */

1895

}

1896

1897

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

1898

}

1899

if(ret != 0){

1900

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

1901

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

1902

}

1903

}

1904

}

1905

}

1906

1907

__attribute__((nonnull))

1908

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

1909

const float delay){

1910

struct dirent **direntries = NULL;

1911

if(hookdir_fd == -1){

1912

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1913

| O_CLOEXEC);

1914

if(hookdir_fd == -1){

1915

if(errno == ENOENT){

1916

if(debug){

1917

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

1918

" found\n", hookdir);

1919

}

1920

} else {

1921

perror_plus("open");

1922

}

1923

return;

1924

}

1925

}

1926

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

1927

runnable_hook, alphasort);

1928

if(numhooks == -1){

1929

perror_plus("scandir");

1930

return;

1931

}

1932

struct dirent *direntry;

1933

int ret;

1934

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

1935

if(devnull == -1){

1936

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

1937

return;

1938

}

1939

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

1940

direntry = direntries[i];

1941

if(debug){

1942

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

1943

direntry->d_name);

1944

}

1945

pid_t hook_pid = fork();

1946

if(hook_pid == 0){

1947

/* Child */

1948

/* Raise privileges */

1949

errno = raise_privileges_permanently();

1950

if(errno != 0){

1951

perror_plus("Failed to raise privileges");

1952

_exit(EX_NOPERM);

1953

}

1954

/* Set group */

1955

errno = 0;

1956

ret = setgid(0);

1957

if(ret == -1){

1958

perror_plus("setgid");

1959

_exit(EX_NOPERM);

1960

}

1961

/* Reset supplementary groups */

1962

errno = 0;

1963

ret = setgroups(0, NULL);

1964

if(ret == -1){

1965

perror_plus("setgroups");

1966

_exit(EX_NOPERM);

1967

}

1968

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

1969

if(ret == -1){

1970

perror_plus("setenv");

1971

_exit(EX_OSERR);

1972

}

1973

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

1974

if(ret == -1){

1975

perror_plus("setenv");

1976

_exit(EX_OSERR);

1977

}

1978

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

1979

if(ret == -1){

1980

perror_plus("setenv");

1981

_exit(EX_OSERR);

1982

}

1983

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

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

char *delaystring;

1989

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

1990

if(ret == -1){

1991

perror_plus("asprintf");

1992

_exit(EX_OSERR);

1993

}

1994

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

1995

if(ret == -1){

1996

free(delaystring);

1997

perror_plus("setenv");

1998

_exit(EX_OSERR);

1999

}

2000

free(delaystring);

2001

if(connect_to != NULL){

2002

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

2003

if(ret == -1){

2004

perror_plus("setenv");

2005

_exit(EX_OSERR);

2006

}

2007

}

2008

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

2009

direntry->d_name,

2010

O_RDONLY));

2011

if(hook_fd == -1){

2012

perror_plus("openat");

2013

_exit(EXIT_FAILURE);

2014

}

2015

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

2016

perror_plus("close");

2017

_exit(EXIT_FAILURE);

2018

}

2019

ret = dup2(devnull, STDIN_FILENO);

2020

if(ret == -1){

2021

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

2022

_exit(EX_OSERR);

2023

}

2024

ret = close(devnull);

2025

if(ret == -1){

2026

perror_plus("close");

2027

_exit(EX_OSERR);

2028

}

2029

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2030

if(ret == -1){

2031

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

2032

_exit(EX_OSERR);

2033

}

2034

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

2035

environ) == -1){

2036

perror_plus("fexecve");

2037

_exit(EXIT_FAILURE);

2038

}

2039

} else {

2040

if(hook_pid == -1){

2041

perror_plus("fork");

2042

free(direntry);

2043

continue;

2044

}

2045

int status;

2046

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

2047

perror_plus("waitpid");

2048

free(direntry);

2049

continue;

2050

}

2051

if(WIFEXITED(status)){

2052

if(WEXITSTATUS(status) != 0){

2053

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

2054

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

2055

WEXITSTATUS(status));

2056

free(direntry);

2057

continue;

2058

}

2059

} else if(WIFSIGNALED(status)){

2060

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

2061

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

2062

WTERMSIG(status));

2063

free(direntry);

2064

continue;

2065

} else {

2066

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

2067

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

2068

free(direntry);

2069

continue;

2070

}

2071

}

2072

if(debug){

2073

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

2074

direntry->d_name);

2075

}

2076

free(direntry);

2077

}

2078

free(direntries);

2079

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

2080

perror_plus("close");

2081

} else {

2082

hookdir_fd = -1;

2083

}

2084

close(devnull);

2085

}

2086

2087

__attribute__((nonnull, warn_unused_result))

2088

int bring_up_interface(const char *const interface,

2089

const float delay){

2090

int old_errno = errno;

2091

int ret;

2092

struct ifreq network;

2093

unsigned int if_index = if_nametoindex(interface);

2094

if(if_index == 0){

2095

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

2096

errno = old_errno;

2097

return ENXIO;

2098

}

2099

2100

if(quit_now){

2101

errno = old_errno;

2102

return EINTR;

2103

}

2104

2105

if(not interface_is_up(interface)){

2106

int ret_errno = 0;

2107

int ioctl_errno = 0;

2108

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

2109

ret_errno = errno;

2110

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

2111

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

2112

errno = old_errno;

2113

return ret_errno;

2114

}

2115

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

2116

2117

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

2118

if(sd == -1){

2119

ret_errno = errno;

2120

perror_plus("socket");

2121

errno = old_errno;

2122

return ret_errno;

2123

}

2124

2125

if(quit_now){

2126

ret = close(sd);

2127

if(ret == -1){

2128

perror_plus("close");

2129

}

2130

errno = old_errno;

2131

return EINTR;

2132

}

2133

2134

if(debug){

2135

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

2136

interface);

2137

}

2138

2139

/* Raise privileges */

2140

ret_errno = raise_privileges();

2141

if(ret_errno != 0){

2142

errno = ret_errno;

2143

perror_plus("Failed to raise privileges");

2144

}

2145

2146

#ifdef __linux__

2147

int ret_linux;

2148

bool restore_loglevel = false;

2149

if(ret_errno == 0){

2150

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2151

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

2152

ret_linux = klogctl(8, NULL, 5);

2153

if(ret_linux == -1){

2154

perror_plus("klogctl");

2155

} else {

2156

restore_loglevel = true;

2157

}

2158

}

2159

#endif /* __linux__ */

2160

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

2161

ioctl_errno = errno;

2162

#ifdef __linux__

2163

if(restore_loglevel){

2164

ret_linux = klogctl(7, NULL, 0);

2165

if(ret_linux == -1){

2166

perror_plus("klogctl");

2167

}

2168

}

2169

#endif /* __linux__ */

2170

2171

/* If raise_privileges() succeeded above */

2172

if(ret_errno == 0){

2173

/* Lower privileges */

2174

ret_errno = lower_privileges();

2175

if(ret_errno != 0){

2176

errno = ret_errno;

2177

perror_plus("Failed to lower privileges");

2178

}

2179

}

2180

2181

/* Close the socket */

2182

ret = close(sd);

2183

if(ret == -1){

2184

perror_plus("close");

2185

}

2186

2187

if(ret_setflags == -1){

2188

errno = ioctl_errno;

2189

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2190

errno = old_errno;

2191

return ioctl_errno;

2192

}

2193

} else if(debug){

2194

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

2195

interface);

2196

}

2197

2198

/* Sleep checking until interface is running.

2199

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

2200

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

2201

if(interface_is_running(interface)){

1070

2202

break;

1071

2203

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

tmpmax = strtoimax(flagstring, &tmp, 0);

1078

if(errno != 0 or tmp == flagstring or (*tmp != '\0'

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1081

if(debug){

1082

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1083

flagstring, if_entry->d_name);

1084

}

1085

free(flagstring);

1086

return 0;

1087

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1090

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1092

if(debug){

1093

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1094

if_entry->d_name);

1095

}

1096

return 0;

1097

}

1098

/* Accept point-to-point devices only if connect_to is specified */

1099

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1100

if(debug){

1101

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1102

if_entry->d_name);

1103

}

1104

return 1;

1105

}

1106

/* Otherwise, reject non-broadcast-capable devices */

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1114

/* Accept this device */

1115

if(debug){

1116

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1117

if_entry->d_name);

1118

}

1119

return 1;

2204

struct timespec sleeptime = { .tv_nsec = 250000000 };

2205

ret = nanosleep(&sleeptime, NULL);

2206

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

2207

perror_plus("nanosleep");

2208

}

2209

}

2210

2211

errno = old_errno;

2212

return 0;

2213

}

2214

2215

__attribute__((nonnull, warn_unused_result))

2216

int take_down_interface(const char *const interface){

2217

int old_errno = errno;

2218

struct ifreq network;

2219

unsigned int if_index = if_nametoindex(interface);

2220

if(if_index == 0){

2221

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

2222

errno = old_errno;

2223

return ENXIO;

2224

}

2225

if(interface_is_up(interface)){

2226

int ret_errno = 0;

2227

int ioctl_errno = 0;

2228

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

2229

ret_errno = errno;

2230

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

2231

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

2232

errno = old_errno;

2233

return ret_errno;

2234

}

2235

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

2236

2237

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

2238

if(sd == -1){

2239

ret_errno = errno;

2240

perror_plus("socket");

2241

errno = old_errno;

2242

return ret_errno;

2243

}

2244

2245

if(debug){

2246

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

2247

interface);

2248

}

2249

2250

/* Raise privileges */

2251

ret_errno = raise_privileges();

2252

if(ret_errno != 0){

2253

errno = ret_errno;

2254

perror_plus("Failed to raise privileges");

2255

}

2256

2257

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

2258

ioctl_errno = errno;

2259

2260

/* If raise_privileges() succeeded above */

2261

if(ret_errno == 0){

2262

/* Lower privileges */

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2266

perror_plus("Failed to lower privileges");

2267

}

2268

}

2269

2270

/* Close the socket */

2271

int ret = close(sd);

2272

if(ret == -1){

2273

perror_plus("close");

2274

}

2275

2276

if(ret_setflags == -1){

2277

errno = ioctl_errno;

2278

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2279

errno = old_errno;

2280

return ioctl_errno;

2281

}

2282

} else if(debug){

2283

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

2284

interface);

2285

}

2286

2287

errno = old_errno;

2288

return 0;

1120

2289

}

1121

2290

1122

2291

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

2292

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

2293

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

2294

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

2295

.current_server = NULL, .interfaces = NULL,

2296

.interfaces_size = 0 };

1123

2297

AvahiSServiceBrowser *sb = NULL;

1124

int error;

2298

error_t ret_errno;

1125

2299

int ret;

1126

2300

intmax_t tmpmax;

1127

2301

char *tmp;

1128

2302

int exitcode = EXIT_SUCCESS;

1129

const char *interface = "";

1130

struct ifreq network;

1131

int sd = -1;

1132

bool take_down_interface = false;

1133

uid_t uid;

1134

gid_t gid;

1135

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

1136

bool tempdir_created = false;

2303

char *interfaces_to_take_down = NULL;

2304

size_t interfaces_to_take_down_size = 0;

2305

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

2306

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

2307

char *tempdir = NULL;

1137

2308

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1138

2309

const char *seckey = PATHDIR "/" SECKEY;

1139

2310

const char *pubkey = PATHDIR "/" PUBKEY;

2311

const char *dh_params_file = NULL;

2312

char *interfaces_hooks = NULL;

1140

2313

1141

2314

bool gnutls_initialized = false;

1142

2315

bool gpgme_initialized = false;

1143

2316

float delay = 2.5f;

2317

double retry_interval = 10; /* 10s between trying a server and

2318

retrying the same server again */

1144

2319

1145

2320

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

2321

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1152

2327

errno = 0;

1153

2328

ret = setgid(gid);

1154

2329

if(ret == -1){

1155

perror("setgid");

2330

perror_plus("setgid");

1156

2331

}

1157

2332

1158

2333

/* Lower user privileges (temporarily) */

1159

2334

errno = 0;

1160

2335

ret = seteuid(uid);

1161

2336

if(ret == -1){

1162

perror("seteuid");

2337

perror_plus("seteuid");

1163

2338

}

1164

2339

1165

2340

if(quit_now){

1192

2367

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

1193

2368

" Diffie-Hellman key exchange",

1194

2369

.group = 2 },

2370

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

2371

.arg = "FILE",

2372

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

2373

" for the Diffie-Hellman key exchange",

2374

.group = 2 },

1195

2375

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

1196

2376

.arg = "STRING",

1197

2377

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

1200

2380

.arg = "SECONDS",

1201

2381

.doc = "Maximum delay to wait for interface startup",

1202

2382

.group = 2 },

2383

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

2384

.arg = "SECONDS",

2385

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

2386

.group = 2 },

2387

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

2388

.arg = "DIR",

2389

.doc = "Directory where network hooks are located",

2390

.group = 2 },

1203

2391

/*

1204

2392

* These reproduce what we would get without ARGP_NO_HELP

1205

2393

*/

1223

2411

connect_to = arg;

1224

2412

break;

1225

2413

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

1226

interface = arg;

2414

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

2415

arg, (int)',');

2416

if(ret_errno != 0){

2417

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

2418

}

1227

2419

break;

1228

2420

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

1229

2421

seckey = arg;

1240

2432

}

1241

2433

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

1242

2434

break;

2435

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

2436

dh_params_file = arg;

2437

break;

1243

2438

case 130: /* --priority */

1244

2439

mc.priority = arg;

1245

2440

break;

1249

2444

if(errno != 0 or tmp == arg or *tmp != '\0'){

1250

2445

argp_error(state, "Bad delay");

1251

2446

}

2447

case 132: /* --retry */

2448

errno = 0;

2449

retry_interval = strtod(arg, &tmp);

2450

if(errno != 0 or tmp == arg or *tmp != '\0'

2451

or (retry_interval * 1000) > INT_MAX

2452

or retry_interval < 0){

2453

argp_error(state, "Bad retry interval");

2454

}

2455

break;

2456

case 133: /* --network-hook-dir */

2457

hookdir = arg;

1252

2458

break;

1253

2459

/*

1254

2460

* These reproduce what we would get without ARGP_NO_HELP

1261

2467

argp_state_help(state, state->out_stream,

1262

2468

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

2469

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

1264

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

2470

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

1265

2471

exit(argp_err_exit_status);

1266

2472

break;

1267

2473

default:

1274

2480

.args_doc = "",

1275

2481

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

1276

2482

" passwords from a Mandos server" };

1277

ret = argp_parse(&argp, argc, argv,

1278

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1279

switch(ret){

2483

ret_errno = argp_parse(&argp, argc, argv,

2484

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2485

switch(ret_errno){

1280

2486

case 0:

1281

2487

break;

1282

2488

case ENOMEM:

1283

2489

default:

1284

errno = ret;

1285

perror("argp_parse");

2490

errno = ret_errno;

2491

perror_plus("argp_parse");

1286

2492

exitcode = EX_OSERR;

1287

2493

goto end;

1288

2494

case EINVAL:

1291

2497

}

1292

2498

}

1293

2499

2500

{

2501

/* Work around Debian bug #633582:

2502

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

2503

2504

/* Re-raise privileges */

2505

ret = raise_privileges();

2506

if(ret != 0){

2507

errno = ret;

2508

perror_plus("Failed to raise privileges");

2509

} else {

2510

struct stat st;

2511

2512

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

2513

int seckey_fd = open(seckey, O_RDONLY);

2514

if(seckey_fd == -1){

2515

perror_plus("open");

2516

} else {

2517

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

2518

if(ret == -1){

2519

perror_plus("fstat");

2520

} else {

2521

if(S_ISREG(st.st_mode)

2522

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

2523

ret = fchown(seckey_fd, uid, gid);

2524

if(ret == -1){

2525

perror_plus("fchown");

2526

}

2527

}

2528

}

2529

close(seckey_fd);

2530

}

2531

}

2532

2533

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

2534

int pubkey_fd = open(pubkey, O_RDONLY);

2535

if(pubkey_fd == -1){

2536

perror_plus("open");

2537

} else {

2538

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

2539

if(ret == -1){

2540

perror_plus("fstat");

2541

} else {

2542

if(S_ISREG(st.st_mode)

2543

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

2544

ret = fchown(pubkey_fd, uid, gid);

2545

if(ret == -1){

2546

perror_plus("fchown");

2547

}

2548

}

2549

}

2550

close(pubkey_fd);

2551

}

2552

}

2553

2554

if(dh_params_file != NULL

2555

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

2556

int dhparams_fd = open(dh_params_file, O_RDONLY);

2557

if(dhparams_fd == -1){

2558

perror_plus("open");

2559

} else {

2560

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

2561

if(ret == -1){

2562

perror_plus("fstat");

2563

} else {

2564

if(S_ISREG(st.st_mode)

2565

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

2566

ret = fchown(dhparams_fd, uid, gid);

2567

if(ret == -1){

2568

perror_plus("fchown");

2569

}

2570

}

2571

}

2572

close(dhparams_fd);

2573

}

2574

}

2575

2576

/* Lower privileges */

2577

ret = lower_privileges();

2578

if(ret != 0){

2579

errno = ret;

2580

perror_plus("Failed to lower privileges");

2581

}

2582

}

2583

}

2584

2585

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

2586

{

2587

char *interface = NULL;

2588

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

2589

interface))){

2590

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

2591

and if_nametoindex(interface) == 0){

2592

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

2593

fprintf_plus(stderr, "Not using nonexisting interface"

2594

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

2595

}

2596

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

2597

interface = NULL;

2598

}

2599

}

2600

}

2601

2602

/* Run network hooks */

2603

{

2604

if(mc.interfaces != NULL){

2605

interfaces_hooks = malloc(mc.interfaces_size);

2606

if(interfaces_hooks == NULL){

2607

perror_plus("malloc");

2608

goto end;

2609

}

2610

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

2611

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

2612

}

2613

run_network_hooks("start", interfaces_hooks != NULL ?

2614

interfaces_hooks : "", delay);

2615

}

2616

1294

2617

if(not debug){

1295

2618

avahi_set_log_function(empty_log);

1296

2619

}

1297

1298

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

1299

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1301

alphasort);

1302

if(ret >= 1){

1303

/* Pick the first good interface */

1304

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

1305

if(debug){

1306

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

1307

}

1308

if(interface == NULL){

1309

perror("malloc");

1310

free(direntries);

1311

exitcode = EXIT_FAILURE;

1312

goto end;

1313

}

1314

free(direntries);

1315

} else {

1316

free(direntries);

1317

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

1318

exitcode = EXIT_FAILURE;

1319

goto end;

1320

}

1321

}

1322

2620

1323

2621

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

1324

2622

from the signal handler */

1325

2623

/* Initialize the pseudo-RNG for Avahi */

1326

2624

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

1327

mc.simple_poll = avahi_simple_poll_new();

1328

if(mc.simple_poll == NULL){

1329

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

2625

simple_poll = avahi_simple_poll_new();

2626

if(simple_poll == NULL){

2627

fprintf_plus(stderr,

2628

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

1330

2629

exitcode = EX_UNAVAILABLE;

1331

2630

goto end;

1332

2631

}

1334

2633

sigemptyset(&sigterm_action.sa_mask);

1335

2634

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1336

2635

if(ret == -1){

1337

perror("sigaddset");

2636

perror_plus("sigaddset");

1338

2637

exitcode = EX_OSERR;

1339

2638

goto end;

1340

2639

}

1341

2640

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1342

2641

if(ret == -1){

1343

perror("sigaddset");

2642

perror_plus("sigaddset");

1344

2643

exitcode = EX_OSERR;

1345

2644

goto end;

1346

2645

}

1347

2646

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1348

2647

if(ret == -1){

1349

perror("sigaddset");

2648

perror_plus("sigaddset");

1350

2649

exitcode = EX_OSERR;

1351

2650

goto end;

1352

2651

}

1356

2655

*/

1357

2656

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1358

2657

if(ret == -1){

1359

perror("sigaction");

2658

perror_plus("sigaction");

1360

2659

return EX_OSERR;

1361

2660

}

1362

2661

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

2662

ret = sigaction(SIGINT, &sigterm_action, NULL);

1364

2663

if(ret == -1){

1365

perror("sigaction");

2664

perror_plus("sigaction");

1366

2665

exitcode = EX_OSERR;

1367

2666

goto end;

1368

2667

}

1369

2668

}

1370

2669

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1371

2670

if(ret == -1){

1372

perror("sigaction");

2671

perror_plus("sigaction");

1373

2672

return EX_OSERR;

1374

2673

}

1375

2674

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

2675

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1377

2676

if(ret == -1){

1378

perror("sigaction");

2677

perror_plus("sigaction");

1379

2678

exitcode = EX_OSERR;

1380

2679

goto end;

1381

2680

}

1382

2681

}

1383

2682

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1384

2683

if(ret == -1){

1385

perror("sigaction");

2684

perror_plus("sigaction");

1386

2685

return EX_OSERR;

1387

2686

}

1388

2687

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

2688

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1390

2689

if(ret == -1){

1391

perror("sigaction");

1392

exitcode = EX_OSERR;

1393

goto end;

1394

}

1395

}

1396

1397

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

1398

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

1399

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

if(if_index == 0){

1401

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

1402

exitcode = EX_UNAVAILABLE;

1403

goto end;

1404

}

1405

1406

if(quit_now){

1407

goto end;

1408

}

1409

1410

/* Re-raise priviliges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror("seteuid");

1415

}

1416

1417

#ifdef __linux__

1418

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1419

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

1420

ret = klogctl(8, NULL, 5);

1421

bool restore_loglevel = true;

1422

if(ret == -1){

1423

restore_loglevel = false;

1424

perror("klogctl");

1425

}

1426

#endif /* __linux__ */

1427

1428

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

if(sd < 0){

1430

perror("socket");

1431

exitcode = EX_OSERR;

1432

#ifdef __linux__

1433

if(restore_loglevel){

1434

ret = klogctl(7, NULL, 0);

1435

if(ret == -1){

1436

perror("klogctl");

1437

}

1438

}

1439

#endif /* __linux__ */

1440

/* Lower privileges */

1441

errno = 0;

1442

ret = seteuid(uid);

1443

if(ret == -1){

1444

perror("seteuid");

1445

}

1446

goto end;

1447

}

1448

strcpy(network.ifr_name, interface);

1449

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

1450

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1452

#ifdef __linux__

1453

if(restore_loglevel){

1454

ret = klogctl(7, NULL, 0);

1455

if(ret == -1){

1456

perror("klogctl");

1457

}

1458

}

1459

#endif /* __linux__ */

1460

exitcode = EX_OSERR;

1461

/* Lower privileges */

1462

errno = 0;

1463

ret = seteuid(uid);

1464

if(ret == -1){

1465

perror("seteuid");

1466

}

1467

goto end;

1468

}

1469

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

1470

network.ifr_flags |= IFF_UP;

1471

take_down_interface = true;

1472

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

1473

if(ret == -1){

1474

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1476

exitcode = EX_OSERR;

1477

#ifdef __linux__

1478

if(restore_loglevel){

1479

ret = klogctl(7, NULL, 0);

1480

if(ret == -1){

1481

perror("klogctl");

2690

perror_plus("sigaction");

2691

exitcode = EX_OSERR;

2692

goto end;

2693

}

2694

}

2695

2696

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

2697

if(mc.interfaces == NULL){

2698

struct dirent **direntries = NULL;

2699

/* Look for any good interfaces */

2700

ret = scandir(sys_class_net, &direntries, good_interface,

2701

alphasort);

2702

if(ret >= 1){

2703

/* Add all found interfaces to interfaces list */

2704

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

2705

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

2706

direntries[i]->d_name);

2707

if(ret_errno != 0){

2708

errno = ret_errno;

2709

perror_plus("argz_add");

2710

free(direntries[i]);

2711

continue;

2712

}

2713

if(debug){

2714

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

2715

direntries[i]->d_name);

2716

}

2717

free(direntries[i]);

2718

}

2719

free(direntries);

2720

} else {

2721

if(ret == 0){

2722

free(direntries);

2723

}

2724

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

2725

exitcode = EXIT_FAILURE;

2726

goto end;

2727

}

2728

}

2729

2730

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

2731

{

2732

char *interface = NULL;

2733

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

2734

interface))){

2735

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

2736

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

2737

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

2738

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

2739

interface);

2740

interface = NULL;

2741

while((interface = argz_next(mc.interfaces,

2742

mc.interfaces_size, interface))){

2743

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

2744

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

2745

interface);

2746

interface = NULL;

1482

2747

}

1483

2748

}

1484

#endif /* __linux__ */

1485

/* Lower privileges */

1486

errno = 0;

1487

ret = seteuid(uid);

1488

if(ret == -1){

1489

perror("seteuid");

1490

}

1491

goto end;

1492

}

1493

}

1494

/* sleep checking until interface is running */

1495

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

1496

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

1497

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

1499

} else if(network.ifr_flags & IFF_RUNNING){

1500

2749

break;

1501

2750

}

1502

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

ret = nanosleep(&sleeptime, NULL);

1504

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

1505

perror("nanosleep");

1506

}

1507

}

1508

if(not take_down_interface){

1509

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

1510

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

1511

if(ret == -1){

1512

perror("close");

1513

}

1514

}

1515

#ifdef __linux__

1516

if(restore_loglevel){

1517

/* Restores kernel loglevel to default */

1518

ret = klogctl(7, NULL, 0);

1519

if(ret == -1){

1520

perror("klogctl");

1521

}

1522

}

1523

#endif /* __linux__ */

1524

/* Lower privileges */

1525

errno = 0;

1526

if(take_down_interface){

1527

/* Lower privileges */

1528

ret = seteuid(uid);

1529

if(ret == -1){

1530

perror("seteuid");

1531

}

1532

} else {

1533

/* Lower privileges permanently */

1534

ret = setuid(uid);

1535

if(ret == -1){

1536

perror("setuid");

1537

}

1538

}

2751

bool interface_was_up = interface_is_up(interface);

2752

errno = bring_up_interface(interface, delay);

2753

if(not interface_was_up){

2754

if(errno != 0){

2755

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

2756

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

2757

} else {

2758

errno = argz_add(&interfaces_to_take_down,

2759

&interfaces_to_take_down_size,

2760

interface);

2761

if(errno != 0){

2762

perror_plus("argz_add");

2763

}

2764

}

2765

}

2766

}

2767

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

2768

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

2769

}

2770

}

2771

2772

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

2773

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

2774

if(debug){

2775

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

2776

mc.interfaces);

2777

}

2778

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

1539

2779

}

1540

2780

1541

2781

if(quit_now){

1542

2782

goto end;

1543

2783

}

1544

2784

1545

ret = init_gnutls_global(pubkey, seckey);

2785

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

1546

2786

if(ret == -1){

1547

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

2787

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

1548

2788

exitcode = EX_UNAVAILABLE;

1549

2789

goto end;

1550

2790

} else {

1555

2795

goto end;

1556

2796

}

1557

2797

1558

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

2798

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

2799

tempdir = mkdtemp(run_tempdir);

2800

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

2801

if(debug){

2802

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

2803

run_tempdir, old_tempdir);

2804

}

2805

tempdir = mkdtemp(old_tempdir);

2806

}

2807

if(tempdir == NULL){

2808

perror_plus("mkdtemp");

1562

2809

goto end;

1563

2810

}

1564

2811

1566

2813

goto end;

1567

2814

}

1568

2815

1569

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

1570

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

2816

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

2817

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

1571

2818

exitcode = EX_UNAVAILABLE;

1572

2819

goto end;

1573

2820

} else {

1582

2829

/* Connect directly, do not use Zeroconf */

1583

2830

/* (Mainly meant for debugging) */

1584

2831

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

2832

1585

2833

if(address == NULL){

1586

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

2834

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

1587

2835

exitcode = EX_USAGE;

1588

2836

goto end;

1589

2837

}

1592

2840

goto end;

1593

2841

}

1594

2842

1595

uint16_t port;

2843

in_port_t port;

1596

2844

errno = 0;

1597

2845

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

1598

2846

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

1599

or tmpmax != (uint16_t)tmpmax){

1600

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

2847

or tmpmax != (in_port_t)tmpmax){

2848

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

1601

2849

exitcode = EX_USAGE;

1602

2850

goto end;

1603

2851

}

1604

2852

1605

2853

if(quit_now){

1606

2854

goto end;

1607

2855

}

1608

2856

1609

port = (uint16_t)tmpmax;

2857

port = (in_port_t)tmpmax;

1610

2858

*address = '\0';

1611

address = connect_to;

1612

2859

/* Colon in address indicates IPv6 */

1613

2860

int af;

1614

if(strchr(address, ':') != NULL){

2861

if(strchr(connect_to, ':') != NULL){

1615

2862

af = AF_INET6;

2863

/* Accept [] around IPv6 address - see RFC 5952 */

2864

if(connect_to[0] == '[' and address[-1] == ']')

2865

{

2866

connect_to++;

2867

address[-1] = '\0';

2868

}

1616

2869

} else {

1617

2870

af = AF_INET;

1618

2871

}

2872

address = connect_to;

1619

2873

1620

2874

if(quit_now){

1621

2875

goto end;

1622

2876

}

1623

2877

1624

2878

while(not quit_now){

1625

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

2879

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

2880

&mc);

1626

2881

if(quit_now or ret == 0){

1627

2882

break;

1628

2883

}

1629

sleep(15);

1630

};

1631

1632

if (not quit_now){

2884

if(debug){

2885

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

2886

(int)retry_interval);

2887

}

2888

sleep((unsigned int)retry_interval);

2889

}

2890

2891

if(not quit_now){

1633

2892

exitcode = EXIT_SUCCESS;

1634

2893

}

1635

2894

1636

2895

goto end;

1637

2896

}

1638

2897

1650

2909

config.publish_domain = 0;

1651

2910

1652

2911

/* Allocate a new server */

1653

mc.server = avahi_server_new(avahi_simple_poll_get

1654

(mc.simple_poll), &config, NULL,

1655

NULL, &error);

2912

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2913

&config, NULL, NULL, &ret);

1656

2914

1657

2915

/* Free the Avahi configuration data */

1658

2916

avahi_server_config_free(&config);

1660

2918

1661

2919

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

1662

2920

if(mc.server == NULL){

1663

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

1664

avahi_strerror(error));

2921

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

2922

avahi_strerror(ret));

1665

2923

exitcode = EX_UNAVAILABLE;

1666

2924

goto end;

1667

2925

}

1673

2931

/* Create the Avahi service browser */

1674

2932

sb = avahi_s_service_browser_new(mc.server, if_index,

1675

2933

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1676

NULL, 0, browse_callback, NULL);

2934

NULL, 0, browse_callback,

2935

(void *)&mc);

1677

2936

if(sb == NULL){

1678

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

1679

avahi_strerror(avahi_server_errno(mc.server)));

2937

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

2938

avahi_strerror(avahi_server_errno(mc.server)));

1680

2939

exitcode = EX_UNAVAILABLE;

1681

2940

goto end;

1682

2941

}

1688

2947

/* Run the main loop */

1689

2948

1690

2949

if(debug){

1691

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

2950

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

1692

2951

}

1693

2952

1694

avahi_simple_poll_loop(mc.simple_poll);

2953

ret = avahi_loop_with_timeout(simple_poll,

2954

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

2955

if(debug){

2956

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

2957

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

2958

}

1695

2959

1696

2960

end:

1697

2961

1698

2962

if(debug){

1699

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

2963

if(signal_received){

2964

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

2965

argv[0], signal_received,

2966

strsignal(signal_received));

2967

} else {

2968

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

2969

}

1700

2970

}

1701

2971

1702

2972

/* Cleanup things */

2973

free(mc.interfaces);

2974

1703

2975

if(sb != NULL)

1704

2976

avahi_s_service_browser_free(sb);

1705

2977

1706

2978

if(mc.server != NULL)

1707

2979

avahi_server_free(mc.server);

1708

2980

1709

if(mc.simple_poll != NULL)

1710

avahi_simple_poll_free(mc.simple_poll);

2981

if(simple_poll != NULL)

2982

avahi_simple_poll_free(simple_poll);

1711

2983

1712

2984

if(gnutls_initialized){

1713

2985

gnutls_certificate_free_credentials(mc.cred);

1714

gnutls_global_deinit();

1715

2986

gnutls_dh_params_deinit(mc.dh_params);

1716

2987

}

1717

2988

1719

2990

gpgme_release(mc.ctx);

1720

2991

}

1721

2992

1722

/* Take down the network interface */

1723

if(take_down_interface){

1724

/* Re-raise priviliges */

1725

errno = 0;

1726

ret = seteuid(0);

1727

if(ret == -1){

1728

perror("seteuid");

1729

}

1730

if(geteuid() == 0){

1731

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

1732

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

1735

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

1736

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

1737

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1739

}

1740

}

1741

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

1742

if(ret == -1){

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

1750

}

1751

}

1752

}

1753

1754

/* Removes the temp directory used by GPGME */

1755

if(tempdir_created){

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

1763

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

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

1770

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

1771

and (direntry->d_name[1] == '\0'

1772

or (direntry->d_name[1] == '.'

1773

and direntry->d_name[2] == '\0'))){

1774

continue;

1775

}

1776

char *fullname = NULL;

1777

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

1778

direntry->d_name);

1779

if(ret < 0){

1780

perror("asprintf");

1781

continue;

1782

}

1783

ret = remove(fullname);

1784

if(ret == -1){

1785

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

1786

strerror(errno));

1787

}

1788

free(fullname);

1789

}

1790

closedir(d);

1791

}

1792

ret = rmdir(tempdir);

1793

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

1794

perror("rmdir");

1795

}

2993

/* Cleans up the circular linked list of Mandos servers the client

2994

has seen */

2995

if(mc.current_server != NULL){

2996

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

2997

while(mc.current_server != NULL){

2998

server *next = mc.current_server->next;

2999

#ifdef __GNUC__

3000

#pragma GCC diagnostic push

3001

#pragma GCC diagnostic ignored "-Wcast-qual"

3002

#endif

3003

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

3004

#ifdef __GNUC__

3005

#pragma GCC diagnostic pop

3006

#endif

3007

free(mc.current_server);

3008

mc.current_server = next;

3009

}

3010

}

3011

3012

/* Re-raise privileges */

3013

{

3014

ret = raise_privileges();

3015

if(ret != 0){

3016

errno = ret;

3017

perror_plus("Failed to raise privileges");

3018

} else {

3019

3020

/* Run network hooks */

3021

run_network_hooks("stop", interfaces_hooks != NULL ?

3022

interfaces_hooks : "", delay);

3023

3024

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

3025

{

3026

char *interface = NULL;

3027

while((interface = argz_next(interfaces_to_take_down,

3028

interfaces_to_take_down_size,

3029

interface))){

3030

ret = take_down_interface(interface);

3031

if(ret != 0){

3032

errno = ret;

3033

perror_plus("Failed to take down interface");

3034

}

3035

}

3036

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

3037

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

3038

" down\n");

3039

}

3040

}

3041

}

3042

3043

ret = lower_privileges_permanently();

3044

if(ret != 0){

3045

errno = ret;

3046

perror_plus("Failed to lower privileges permanently");

3047

}

3048

}

3049

3050

free(interfaces_to_take_down);

3051

free(interfaces_hooks);

3052

3053

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

3054

uintmax_t level){

3055

struct dirent **direntries = NULL;

3056

int dret;

3057

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

3058

O_RDONLY

3059

| O_NOFOLLOW

3060

| O_DIRECTORY

3061

| O_PATH));

3062

if(dir_fd == -1){

3063

perror_plus("open");

3064

}

3065

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

3066

notdotentries, alphasort);

3067

if(numentries >= 0){

3068

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

3069

if(debug){

3070

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

3071

dirname, direntries[i]->d_name);

3072

}

3073

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

3074

if(dret == -1){

3075

if(errno == EISDIR){

3076

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

3077

AT_REMOVEDIR);

3078

}

3079

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

3080

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

3081

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

3082

/* Recurse only in this special case */

3083

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

3084

dret = 0;

3085

}

3086

if(dret == -1){

3087

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

3088

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

3089

}

3090

}

3091

free(direntries[i]);

3092

}

3093

3094

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

3095

free(direntries);

3096

if(numentries == -1){

3097

perror_plus("scandirat");

3098

}

3099

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3100

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

3101

perror_plus("rmdir");

3102

}

3103

} else {

3104

perror_plus("scandirat");

3105

}

3106

close(dir_fd);

3107

}

3108

3109

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

3110

if(tempdir != NULL){

3111

clean_dir_at(-1, tempdir, 0);

1796

3112

}

1797

3113

1798

3114

if(quit_now){

1802

3118

&old_sigterm_action,

1803

3119

NULL));

1804

3120

if(ret == -1){

1805

perror("sigaction");

3121

perror_plus("sigaction");

1806

3122

}

1807

3123

do {

1808

3124

ret = raise(signal_received);

1809

3125

} while(ret != 0 and errno == EINTR);

1810

3126

if(ret != 0){

1811

perror("raise");

3127

perror_plus("raise");

1812

3128

abort();

1813

3129

}

1814

3130

TEMP_FAILURE_RETRY(pause());