/mandos/release : revision 237.7.488

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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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124

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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167

typedef struct {

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AvahiSimplePoll *simple_poll;

136

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;

140

172

const char *priority;

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173

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

144

/* 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

185

/* 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: ",

200

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;

216

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;

165

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){

262

new_server->next = new_server;

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new_server->prev = new_server;

264

*current_server = new_server;

265

} 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;

273

}

274

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/*

170

276

* Initialize GPGME.

171

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

286

/*

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;

183

291

int fd;

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gpgme_data_t pgp_data;

185

293

186

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

187

295

if(fd == -1){

188

perror("open");

296

perror_plus("open");

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return false;

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298

}

191

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192

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

193

301

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",

310

gpgme_strsource(rc), gpgme_strerror(rc));

203

311

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

close(dhpfile);

617

if(params.data == NULL){

618

dhparamsfilename = NULL;

619

}

620

if(dhparamsfilename == NULL){

621

break;

622

}

623

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

624

GNUTLS_X509_FMT_PEM);

625

if(ret != GNUTLS_E_SUCCESS){

626

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

627

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

628

safer_gnutls_strerror(ret));

629

dhparamsfilename = NULL;

630

}

631

free(params.data);

632

} while(false);

633

}

634

if(dhparamsfilename == NULL){

635

if(mc->dh_bits == 0){

636

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

637

/* Try to read the private key file */

638

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

639

do {

640

int secfile = open(seckeyfilename, O_RDONLY);

641

if(secfile == -1){

642

perror_plus("open");

643

break;

644

}

645

size_t buffer_capacity = 0;

646

while(true){

647

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

648

(size_t)buffer.size,

649

(size_t)buffer_capacity);

650

if(buffer_capacity == 0){

651

perror_plus("incbuffer");

652

free(buffer.data);

653

buffer.data = NULL;

654

break;

655

}

656

ssize_t bytes_read = read(secfile,

657

buffer.data + buffer.size,

658

BUFFER_SIZE);

659

/* EOF */

660

if(bytes_read == 0){

661

break;

662

}

663

/* check bytes_read for failure */

664

if(bytes_read < 0){

665

perror_plus("read");

666

free(buffer.data);

667

buffer.data = NULL;

668

break;

669

}

670

buffer.size += (unsigned int)bytes_read;

671

}

672

close(secfile);

673

} while(false);

674

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

675

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

676

if(buffer.data != NULL){

677

{

678

gnutls_openpgp_privkey_t privkey = NULL;

679

ret = gnutls_openpgp_privkey_init(&privkey);

680

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error initializing OpenPGP key"

682

" structure: %s",

683

safer_gnutls_strerror(ret));

684

free(buffer.data);

685

buffer.data = NULL;

686

} else {

687

ret = gnutls_openpgp_privkey_import

688

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

689

if(ret != GNUTLS_E_SUCCESS){

690

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

691

safer_gnutls_strerror(ret));

692

privkey = NULL;

693

}

694

free(buffer.data);

695

buffer.data = NULL;

696

if(privkey != NULL){

697

/* Use private key to suggest an appropriate

698

sec_param */

699

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

700

gnutls_openpgp_privkey_deinit(privkey);

701

if(debug){

702

fprintf_plus(stderr, "This OpenPGP key implies using"

703

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

704

safe_string(gnutls_sec_param_get_name

705

(sec_param)));

706

}

707

}

708

}

709

}

710

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

711

/* Err on the side of caution */

712

sec_param = GNUTLS_SEC_PARAM_ULTRA;

713

if(debug){

714

fprintf_plus(stderr, "Falling back to security parameter"

715

" \"%s\"\n",

716

safe_string(gnutls_sec_param_get_name

717

(sec_param)));

718

}

719

}

720

}

721

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

722

if(uret != 0){

723

mc->dh_bits = uret;

724

if(debug){

725

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

726

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

727

safe_string(gnutls_sec_param_get_name

728

(sec_param)),

729

mc->dh_bits);

730

}

731

} else {

732

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

733

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

734

safe_string(gnutls_sec_param_get_name

735

(sec_param)),

736

safer_gnutls_strerror(ret));

737

goto globalfail;

738

}

739

} else if(debug){

740

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

741

mc->dh_bits);

742

}

743

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

744

if(ret != GNUTLS_E_SUCCESS){

745

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

746

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

747

safer_gnutls_strerror(ret));

748

goto globalfail;

749

}

750

}

751

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

470

752

471

753

return 0;

472

754

473

755

globalfail:

474

756

475

gnutls_certificate_free_credentials(mc.cred);

476

gnutls_global_deinit();

477

gnutls_dh_params_deinit(mc.dh_params);

757

gnutls_certificate_free_credentials(mc->cred);

758

gnutls_dh_params_deinit(mc->dh_params);

478

759

return -1;

479

760

}

480

761

481

static int init_gnutls_session(gnutls_session_t *session){

762

__attribute__((nonnull, warn_unused_result))

763

static int init_gnutls_session(gnutls_session_t *session,

764

mandos_context *mc){

482

765

int ret;

483

766

/* GnuTLS session creation */

484

767

do {

488

771

}

489

772

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

490

773

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

774

fprintf_plus(stderr,

775

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

776

safer_gnutls_strerror(ret));

493

777

}

494

778

495

779

{

496

780

const char *err;

497

781

do {

498

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

782

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

499

783

if(quit_now){

500

784

gnutls_deinit(*session);

501

785

return -1;

502

786

}

503

787

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

504

788

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));

789

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

790

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

791

safer_gnutls_strerror(ret));

508

792

gnutls_deinit(*session);

509

793

return -1;

510

794

}

512

796

513

797

do {

514

798

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

515

mc.cred);

799

mc->cred);

516

800

if(quit_now){

517

801

gnutls_deinit(*session);

518

802

return -1;

519

803

}

520

804

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

521

805

if(ret != GNUTLS_E_SUCCESS){

522

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

523

safer_gnutls_strerror(ret));

806

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

807

safer_gnutls_strerror(ret));

524

808

gnutls_deinit(*session);

525

809

return -1;

526

810

}

528

812

/* ignore client certificate if any. */

529

813

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

530

814

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

532

533

815

return 0;

534

816

}

535

817

537

819

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

538

820

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

539

821

822

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

823

__attribute__((warn_unused_result))

824

int raise_privileges(void){

825

int old_errno = errno;

826

int ret = 0;

827

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

828

ret = errno;

829

}

830

errno = old_errno;

831

return ret;

832

}

833

834

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

835

__attribute__((warn_unused_result))

836

int raise_privileges_permanently(void){

837

int old_errno = errno;

838

int ret = raise_privileges();

839

if(ret != 0){

840

errno = old_errno;

841

return ret;

842

}

843

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

844

ret = errno;

845

}

846

errno = old_errno;

847

return ret;

848

}

849

850

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

851

__attribute__((warn_unused_result))

852

int lower_privileges(void){

853

int old_errno = errno;

854

int ret = 0;

855

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

856

ret = errno;

857

}

858

errno = old_errno;

859

return ret;

860

}

861

862

/* Lower privileges permanently */

863

__attribute__((warn_unused_result))

864

int lower_privileges_permanently(void){

865

int old_errno = errno;

866

int ret = 0;

867

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

868

ret = errno;

869

}

870

errno = old_errno;

871

return ret;

872

}

873

874

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

875

__attribute__((nonnull, warn_unused_result))

876

static bool add_delete_local_route(const bool add,

877

const char *address,

878

AvahiIfIndex if_index){

879

int ret;

880

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

881

char add_arg[] = "add";

882

char delete_arg[] = "delete";

883

char debug_flag[] = "--debug";

884

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

885

if(pluginhelperdir == NULL){

886

if(debug){

887

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

888

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

889

}

890

return false;

891

}

892

893

char interface[IF_NAMESIZE];

894

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

895

perror_plus("if_indextoname");

896

return false;

897

}

898

899

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

900

if(devnull == -1){

901

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

902

return false;

903

}

904

pid_t pid = fork();

905

if(pid == 0){

906

/* Child */

907

/* Raise privileges */

908

errno = raise_privileges_permanently();

909

if(errno != 0){

910

perror_plus("Failed to raise privileges");

911

/* _exit(EX_NOPERM); */

912

} else {

913

/* Set group */

914

errno = 0;

915

ret = setgid(0);

916

if(ret == -1){

917

perror_plus("setgid");

918

_exit(EX_NOPERM);

919

}

920

/* Reset supplementary groups */

921

errno = 0;

922

ret = setgroups(0, NULL);

923

if(ret == -1){

924

perror_plus("setgroups");

925

_exit(EX_NOPERM);

926

}

927

}

928

ret = dup2(devnull, STDIN_FILENO);

929

if(ret == -1){

930

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

931

_exit(EX_OSERR);

932

}

933

ret = close(devnull);

934

if(ret == -1){

935

perror_plus("close");

936

_exit(EX_OSERR);

937

}

938

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

939

if(ret == -1){

940

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

941

_exit(EX_OSERR);

942

}

943

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

944

O_RDONLY

945

| O_DIRECTORY

946

| O_PATH

947

| O_CLOEXEC));

948

if(helperdir_fd == -1){

949

perror_plus("open");

950

_exit(EX_UNAVAILABLE);

951

}

952

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

953

helper, O_RDONLY));

954

if(helper_fd == -1){

955

perror_plus("openat");

956

close(helperdir_fd);

957

_exit(EX_UNAVAILABLE);

958

}

959

close(helperdir_fd);

960

#ifdef __GNUC__

961

#pragma GCC diagnostic push

962

#pragma GCC diagnostic ignored "-Wcast-qual"

963

#endif

964

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

965

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

966

interface, debug ? debug_flag : NULL, NULL },

967

environ) == -1){

968

#ifdef __GNUC__

969

#pragma GCC diagnostic pop

970

#endif

971

perror_plus("fexecve");

972

_exit(EXIT_FAILURE);

973

}

974

}

975

if(pid == -1){

976

perror_plus("fork");

977

return false;

978

}

979

int status;

980

pid_t pret = -1;

981

errno = 0;

982

do {

983

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

984

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

985

int errno_raising = 0;

986

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

987

errno_raising = errno;

988

perror_plus("Failed to raise privileges in order to"

989

" kill helper program");

990

}

991

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

992

perror_plus("kill");

993

}

994

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

995

perror_plus("Failed to lower privileges after killing"

996

" helper program");

997

}

998

return false;

999

}

1000

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

1001

if(pret == -1){

1002

perror_plus("waitpid");

1003

return false;

1004

}

1005

if(WIFEXITED(status)){

1006

if(WEXITSTATUS(status) != 0){

1007

fprintf_plus(stderr, "Error: iprouteadddel exited"

1008

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

1009

return false;

1010

}

1011

return true;

1012

}

1013

if(WIFSIGNALED(status)){

1014

fprintf_plus(stderr, "Error: iprouteadddel died by"

1015

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

1016

return false;

1017

}

1018

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

1019

return false;

1020

}

1021

1022

__attribute__((nonnull, warn_unused_result))

1023

static bool add_local_route(const char *address,

1024

AvahiIfIndex if_index){

1025

if(debug){

1026

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

1027

}

1028

return add_delete_local_route(true, address, if_index);

1029

}

1030

1031

__attribute__((nonnull, warn_unused_result))

1032

static bool delete_local_route(const char *address,

1033

AvahiIfIndex if_index){

1034

if(debug){

1035

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

1036

}

1037

return add_delete_local_route(false, address, if_index);

1038

}

1039

540

1040

/* Called when a Mandos server is found */

541

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

1041

__attribute__((nonnull, warn_unused_result))

1042

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

542

1043

AvahiIfIndex if_index,

543

int af){

1044

int af, mandos_context *mc){

544

1045

int ret, tcp_sd = -1;

545

1046

ssize_t sret;

546

union {

547

struct sockaddr_in in;

548

struct sockaddr_in6 in6;

549

} to;

1047

struct sockaddr_storage to;

550

1048

char *buffer = NULL;

551

1049

char *decrypted_buffer = NULL;

552

1050

size_t buffer_length = 0;

555

1053

int retval = -1;

556

1054

gnutls_session_t session;

557

1055

int pf; /* Protocol family */

1056

bool route_added = false;

558

1057

559

1058

errno = 0;

560

1059

571

1070

pf = PF_INET;

572

1071

break;

573

1072

default:

574

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

1073

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

575

1074

errno = EINVAL;

576

1075

return -1;

577

1076

}

578

1077

579

ret = init_gnutls_session(&session);

1078

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

1079

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

1080

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

1081

bool match = false;

1082

{

1083

char *interface = NULL;

1084

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

1085

mc->interfaces_size,

1086

interface))){

1087

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

1088

match = true;

1089

break;

1090

}

1091

}

1092

}

1093

if(not match){

1094

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

1095

connect to the server */

1096

if(debug){

1097

char interface[IF_NAMESIZE];

1098

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

1099

perror_plus("if_indextoname");

1100

} else {

1101

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

1102

" \"%s\"\n",

1103

if_indextoname((unsigned int)if_index,

1104

interface));

1105

}

1106

}

1107

return -1;

1108

}

1109

}

1110

1111

ret = init_gnutls_session(&session, mc);

580

1112

if(ret != 0){

581

1113

return -1;

582

1114

}

583

1115

584

1116

if(debug){

585

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

586

"\n", ip, port);

1117

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

1118

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

587

1119

}

588

1120

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

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

590

1122

if(tcp_sd < 0){

591

1123

int e = errno;

592

perror("socket");

1124

perror_plus("socket");

593

1125

errno = e;

594

1126

goto mandos_end;

595

1127

}

599

1131

goto mandos_end;

600

1132

}

601

1133

602

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

603

1134

if(af == AF_INET6){

604

to.in6.sin6_family = (sa_family_t)af;

605

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

1135

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

1136

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

1137

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

606

1138

} else { /* IPv4 */

607

to.in.sin_family = (sa_family_t)af;

608

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

1139

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

1140

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

1141

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

609

1142

}

610

1143

if(ret < 0 ){

611

1144

int e = errno;

612

perror("inet_pton");

1145

perror_plus("inet_pton");

613

1146

errno = e;

614

1147

goto mandos_end;

615

1148

}

616

1149

if(ret == 0){

617

1150

int e = errno;

618

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

1151

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

619

1152

errno = e;

620

1153

goto mandos_end;

621

1154

}

622

1155

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*/

1156

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

1157

if(IN6_IS_ADDR_LINKLOCAL

1158

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

630

1159

if(if_index == AVAHI_IF_UNSPEC){

631

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

632

" without a network interface\n");

1160

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

1161

" incomplete without a network interface\n");

633

1162

errno = EINVAL;

634

1163

goto mandos_end;

635

1164

}

636

1165

/* Set the network interface number as scope */

637

to.in6.sin6_scope_id = (uint32_t)if_index;

1166

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

638

1167

}

639

1168

} else {

640

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

641

-Wconversion and

642

-Wunreachable-code */

1169

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

643

1170

}

644

1171

645

1172

if(quit_now){

651

1178

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

652

1179

char interface[IF_NAMESIZE];

653

1180

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

654

perror("if_indextoname");

1181

perror_plus("if_indextoname");

655

1182

} else {

656

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

657

ip, interface, port);

1183

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

1184

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

658

1185

}

659

1186

} else {

660

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

661

port);

1187

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

1188

ip, (uintmax_t)port);

662

1189

}

663

1190

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

1191

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;

1192

if(af == AF_INET6){

1193

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

1194

sizeof(struct sockaddr_in6),

1195

addrstr, sizeof(addrstr), NULL, 0,

1196

NI_NUMERICHOST);

1197

} else {

1198

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

1199

sizeof(struct sockaddr_in),

1200

addrstr, sizeof(addrstr), NULL, 0,

1201

NI_NUMERICHOST);

1202

}

1203

if(ret == EAI_SYSTEM){

1204

perror_plus("getnameinfo");

1205

} else if(ret != 0) {

1206

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

1207

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

1208

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

1209

}

1210

}

1211

1212

if(quit_now){

1213

errno = EINTR;

1214

goto mandos_end;

1215

}

1216

1217

while(true){

1218

if(af == AF_INET6){

1219

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

1220

sizeof(struct sockaddr_in6));

1221

} else {

1222

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

1223

sizeof(struct sockaddr_in));

1224

}

1225

if(ret < 0){

1226

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

1227

and if_index != AVAHI_IF_UNSPEC

1228

and connect_to == NULL

1229

and not route_added and

1230

((af == AF_INET6 and not

1231

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1232

&to)->sin6_addr)))

1233

or (af == AF_INET and

1234

/* Not a a IPv4LL address */

1235

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

1236

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

1237

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

1238

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

1239

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

1240

connect to a Mandos server announced by Avahi on a server

1241

host with a global address. Work around this by retrying

1242

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

1243

1244

Avahi bug reference:

1245

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

1246

https://bugs.debian.org/587961

1247

*/

1248

if(debug){

1249

fprintf_plus(stderr, "Mandos server unreachable, trying"

1250

" direct route\n");

1251

}

1252

int e = errno;

1253

route_added = add_local_route(ip, if_index);

1254

if(route_added){

1255

continue;

1256

}

1257

errno = e;

1258

}

1259

if(errno != ECONNREFUSED or debug){

1260

int e = errno;

1261

perror_plus("connect");

1262

errno = e;

1263

}

1264

goto mandos_end;

1265

}

1266

1267

if(quit_now){

1268

errno = EINTR;

1269

goto mandos_end;

1270

}

1271

break;

704

1272

}

705

1273

706

1274

const char *out = mandos_protocol_version;

708

1276

while(true){

709

1277

size_t out_size = strlen(out);

710

1278

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

711

out_size - written));

1279

out_size - written));

712

1280

if(ret == -1){

713

1281

int e = errno;

714

perror("write");

1282

perror_plus("write");

715

1283

errno = e;

716

1284

goto mandos_end;

717

1285

}

734

1302

}

735

1303

736

1304

if(debug){

737

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

1305

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

738

1306

}

739

1307

740

1308

if(quit_now){

742

1310

goto mandos_end;

743

1311

}

744

1312

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1313

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

1314

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

1315

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

1316

gnutls_transport_set_ptr(session,

1317

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

746

1318

747

1319

if(quit_now){

748

1320

errno = EINTR;

759

1331

760

1332

if(ret != GNUTLS_E_SUCCESS){

761

1333

if(debug){

762

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

1334

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

763

1335

gnutls_perror(ret);

764

1336

}

765

1337

errno = EPROTO;

769

1341

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

770

1342

771

1343

if(debug){

772

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

773

ip);

1344

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1345

" %s\n", ip);

774

1346

}

775

1347

776

1348

while(true){

781

1353

}

782

1354

783

1355

buffer_capacity = incbuffer(&buffer, buffer_length,

784

buffer_capacity);

1356

buffer_capacity);

785

1357

if(buffer_capacity == 0){

786

1358

int e = errno;

787

perror("incbuffer");

1359

perror_plus("incbuffer");

788

1360

errno = e;

789

1361

goto mandos_end;

790

1362

}

814

1386

}

815

1387

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

816

1388

if(ret < 0){

817

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

1389

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

1390

"***\n");

818

1391

gnutls_perror(ret);

819

1392

errno = EPROTO;

820

1393

goto mandos_end;

821

1394

}

822

1395

break;

823

1396

default:

824

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

825

" encrypted session with Mandos server\n");

1397

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

1398

" encrypted session with Mandos server\n");

826

1399

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

1400

errno = EIO;

828

1401

goto mandos_end;

833

1406

}

834

1407

835

1408

if(debug){

836

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

1409

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

837

1410

}

838

1411

839

1412

if(quit_now){

851

1424

852

1425

if(buffer_length > 0){

853

1426

ssize_t decrypted_buffer_size;

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

buffer_length,

856

&decrypted_buffer);

1427

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1428

&decrypted_buffer, mc);

857

1429

if(decrypted_buffer_size >= 0){

858

1430

1431

clearerr(stdout);

859

1432

written = 0;

860

1433

while(written < (size_t) decrypted_buffer_size){

861

1434

if(quit_now){

869

1442

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

870

1443

int e = errno;

871

1444

if(debug){

872

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

873

strerror(errno));

1445

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

1446

strerror(errno));

874

1447

}

875

1448

errno = e;

876

1449

goto mandos_end;

877

1450

}

878

1451

written += (size_t)ret;

879

1452

}

1453

ret = fflush(stdout);

1454

if(ret != 0){

1455

int e = errno;

1456

if(debug){

1457

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

1458

strerror(errno));

1459

}

1460

errno = e;

1461

goto mandos_end;

1462

}

880

1463

retval = 0;

881

1464

}

882

1465

}

885

1468

886

1469

mandos_end:

887

1470

{

1471

if(route_added){

1472

if(not delete_local_route(ip, if_index)){

1473

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

1474

" interface %d", ip, if_index);

1475

}

1476

}

888

1477

int e = errno;

889

1478

free(decrypted_buffer);

890

1479

free(buffer);

891

1480

if(tcp_sd >= 0){

892

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

1481

ret = close(tcp_sd);

893

1482

}

894

1483

if(ret == -1){

895

1484

if(e == 0){

896

1485

e = errno;

897

1486

}

898

perror("close");

1487

perror_plus("close");

899

1488

}

900

1489

gnutls_deinit(session);

1490

errno = e;

901

1491

if(quit_now){

902

e = EINTR;

1492

errno = EINTR;

903

1493

retval = -1;

904

1494

}

905

errno = e;

906

1495

}

907

1496

return retval;

908

1497

}

920

1509

AVAHI_GCC_UNUSED AvahiStringList *txt,

921

1510

AVAHI_GCC_UNUSED AvahiLookupResultFlags

922

1511

flags,

923

AVAHI_GCC_UNUSED void* userdata){

924

assert(r);

1512

void *mc){

1513

if(r == NULL){

1514

return;

1515

}

925

1516

926

1517

/* Called whenever a service has been resolved successfully or

927

1518

timed out */

928

1519

929

1520

if(quit_now){

1521

avahi_s_service_resolver_free(r);

930

1522

return;

931

1523

}

932

1524

933

1525

switch(event){

934

1526

default:

935

1527

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)));

1528

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

1529

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

1530

domain,

1531

avahi_strerror(avahi_server_errno

1532

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

939

1533

break;

940

1534

941

1535

case AVAHI_RESOLVER_FOUND:

943

1537

char ip[AVAHI_ADDRESS_STR_MAX];

944

1538

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

945

1539

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);

1540

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

1541

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

1542

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

949

1543

}

950

int ret = start_mandos_communication(ip, port, interface,

951

avahi_proto_to_af(proto));

1544

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

1545

interface,

1546

avahi_proto_to_af(proto),

1547

mc);

952

1548

if(ret == 0){

953

avahi_simple_poll_quit(mc.simple_poll);

1549

avahi_simple_poll_quit(simple_poll);

1550

} else {

1551

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

1552

avahi_proto_to_af(proto),

1553

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

1554

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

1555

" list\n", name);

1556

}

954

1557

}

955

1558

}

956

1559

}

966

1569

const char *domain,

967

1570

AVAHI_GCC_UNUSED AvahiLookupResultFlags

968

1571

flags,

969

AVAHI_GCC_UNUSED void* userdata){

970

assert(b);

1572

void *mc){

1573

if(b == NULL){

1574

return;

1575

}

971

1576

972

1577

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

973

1578

is removed from the LAN */

980

1585

default:

981

1586

case AVAHI_BROWSER_FAILURE:

982

1587

983

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

984

avahi_strerror(avahi_server_errno(mc.server)));

985

avahi_simple_poll_quit(mc.simple_poll);

1588

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

1589

avahi_strerror(avahi_server_errno

1590

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

1591

avahi_simple_poll_quit(simple_poll);

986

1592

return;

987

1593

988

1594

case AVAHI_BROWSER_NEW:

991

1597

the callback function is called the Avahi server will free the

992

1598

resolver for us. */

993

1599

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)));

1600

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

1601

interface, protocol, name, type,

1602

domain, protocol, 0,

1603

resolve_callback, mc) == NULL)

1604

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

1605

" %s\n", name,

1606

avahi_strerror(avahi_server_errno

1607

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

999

1608

break;

1000

1609

1001

1610

case AVAHI_BROWSER_REMOVE:

1004

1613

case AVAHI_BROWSER_ALL_FOR_NOW:

1005

1614

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1006

1615

if(debug){

1007

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

1616

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

1617

" searching...\n");

1008

1618

}

1009

1619

break;

1010

1620

}

1011

1621

}

1012

1622

1013

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

1623

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

1014

1624

static void handle_sigterm(int sig){

1015

1625

if(quit_now){

1016

1626

return;

1018

1628

quit_now = 1;

1019

1629

signal_received = sig;

1020

1630

int old_errno = errno;

1021

if(mc.simple_poll != NULL){

1022

avahi_simple_poll_quit(mc.simple_poll);

1631

/* set main loop to exit */

1632

if(simple_poll != NULL){

1633

avahi_simple_poll_quit(simple_poll);

1023

1634

}

1024

1635

errno = old_errno;

1025

1636

}

1026

1637

1638

__attribute__((nonnull, warn_unused_result))

1639

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

1640

int ret;

1641

int old_errno;

1642

1643

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

1644

if(s < 0){

1645

old_errno = errno;

1646

perror_plus("socket");

1647

errno = old_errno;

1648

return false;

1649

}

1650

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

1651

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

1652

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1653

if(ret == -1){

1654

if(debug){

1655

old_errno = errno;

1656

perror_plus("ioctl SIOCGIFFLAGS");

1657

errno = old_errno;

1658

}

1659

close(s);

1660

return false;

1661

}

1662

close(s);

1663

return true;

1664

}

1665

1666

__attribute__((nonnull, warn_unused_result))

1667

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

1668

1669

/* Reject the loopback device */

1670

if(ifr->ifr_flags & IFF_LOOPBACK){

1671

if(debug){

1672

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

1673

ifname);

1674

}

1675

return false;

1676

}

1677

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

1678

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

1679

if(debug){

1680

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

1681

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

1682

}

1683

return true;

1684

}

1685

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

1686

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

1687

if(debug){

1688

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1689

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

1690

}

1691

return false;

1692

}

1693

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

1694

if(ifr->ifr_flags & IFF_NOARP){

1695

if(debug){

1696

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

1697

ifname);

1698

}

1699

return false;

1700

}

1701

1702

/* Accept this device */

1703

if(debug){

1704

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

1705

}

1706

return true;

1707

}

1708

1027

1709

/*

1028

1710

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

1029

1711

* corresponds to an acceptable network device.

1030

1712

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

1031

1713

*/

1714

__attribute__((nonnull, warn_unused_result))

1032

1715

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

1716

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

1042

1717

return 0;

1043

1718

}

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){

1719

1720

struct ifreq ifr;

1721

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

1722

if(debug){

1723

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

1724

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

1725

}

1726

return 0;

1727

}

1728

1729

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

1730

return 0;

1731

}

1732

return 1;

1733

}

1734

1735

/*

1736

* This function determines if a network interface is up.

1737

*/

1738

__attribute__((nonnull, warn_unused_result))

1739

bool interface_is_up(const char *interface){

1740

struct ifreq ifr;

1741

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

1742

if(debug){

1743

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

1744

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

1745

}

1746

return false;

1747

}

1748

1749

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

1750

}

1751

1752

/*

1753

* This function determines if a network interface is running

1754

*/

1755

__attribute__((nonnull, warn_unused_result))

1756

bool interface_is_running(const char *interface){

1757

struct ifreq ifr;

1758

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

1759

if(debug){

1760

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

1761

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

1762

}

1763

return false;

1764

}

1765

1766

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

1767

}

1768

1769

__attribute__((nonnull, pure, warn_unused_result))

1770

int notdotentries(const struct dirent *direntry){

1771

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

1772

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

1773

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

1774

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

1775

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

1776

return 0;

1777

}

1778

return 1;

1779

}

1780

1781

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

1782

__attribute__((nonnull, warn_unused_result))

1783

int runnable_hook(const struct dirent *direntry){

1784

int ret;

1785

size_t sret;

1786

struct stat st;

1787

1788

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

1789

/* Empty name? */

1790

return 0;

1791

}

1792

1793

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

1794

"abcdefghijklmnopqrstuvwxyz"

1795

"0123456789"

1796

"_.-");

1797

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

1798

/* Contains non-allowed characters */

1799

if(debug){

1800

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

1801

direntry->d_name);

1802

}

1803

return 0;

1804

}

1805

1806

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

1807

if(ret == -1){

1808

if(debug){

1809

perror_plus("Could not stat hook");

1810

}

1811

return 0;

1812

}

1813

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

1814

/* Not a regular file */

1815

if(debug){

1816

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

1817

direntry->d_name);

1818

}

1819

return 0;

1820

}

1821

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

1822

/* Not executable */

1823

if(debug){

1824

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

1825

direntry->d_name);

1826

}

1827

return 0;

1828

}

1829

if(debug){

1830

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

1831

direntry->d_name);

1832

}

1833

return 1;

1834

}

1835

1836

__attribute__((nonnull, warn_unused_result))

1837

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1838

mandos_context *mc){

1839

int ret;

1840

struct timespec now;

1841

struct timespec waited_time;

1842

intmax_t block_time;

1843

1844

while(true){

1845

if(mc->current_server == NULL){

1846

if(debug){

1847

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

1848

" No timeout!\n");

1849

}

1850

ret = avahi_simple_poll_iterate(s, -1);

1851

} else {

1852

if(debug){

1853

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

1854

" it, or wait\n");

1855

}

1856

/* the current time */

1857

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1858

if(ret == -1){

1859

perror_plus("clock_gettime");

1860

return -1;

1861

}

1862

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

1863

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

1864

waited_time.tv_sec = (now.tv_sec

1865

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

1866

waited_time.tv_nsec = (now.tv_nsec

1867

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

1868

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

1869

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

1870

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

1871

block_time = ((retry_interval

1872

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

1873

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

1874

1875

if(debug){

1876

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

1877

block_time);

1878

}

1879

1880

if(block_time <= 0){

1881

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

1882

mc->current_server->port,

1883

mc->current_server->if_index,

1884

mc->current_server->af, mc);

1885

if(ret == 0){

1886

avahi_simple_poll_quit(s);

1887

return 0;

1888

}

1889

ret = clock_gettime(CLOCK_MONOTONIC,

1890

&mc->current_server->last_seen);

1891

if(ret == -1){

1892

perror_plus("clock_gettime");

1893

return -1;

1894

}

1895

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

1896

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

1897

servers, but don't block */

1898

}

1899

1900

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

1901

}

1902

if(ret != 0){

1903

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

1904

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

1905

}

1906

}

1907

}

1908

}

1909

1910

__attribute__((nonnull))

1911

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

1912

const float delay){

1913

struct dirent **direntries = NULL;

1914

if(hookdir_fd == -1){

1915

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1916

| O_CLOEXEC);

1917

if(hookdir_fd == -1){

1918

if(errno == ENOENT){

1919

if(debug){

1920

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

1921

" found\n", hookdir);

1922

}

1923

} else {

1924

perror_plus("open");

1925

}

1926

return;

1927

}

1928

}

1929

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

1930

if(devnull == -1){

1931

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

1932

return;

1933

}

1934

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

1935

runnable_hook, alphasort);

1936

if(numhooks == -1){

1937

perror_plus("scandir");

1938

close(devnull);

1939

return;

1940

}

1941

struct dirent *direntry;

1942

int ret;

1943

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

1944

direntry = direntries[i];

1945

if(debug){

1946

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

1947

direntry->d_name);

1948

}

1949

pid_t hook_pid = fork();

1950

if(hook_pid == 0){

1951

/* Child */

1952

/* Raise privileges */

1953

errno = raise_privileges_permanently();

1954

if(errno != 0){

1955

perror_plus("Failed to raise privileges");

1956

_exit(EX_NOPERM);

1957

}

1958

/* Set group */

1959

errno = 0;

1960

ret = setgid(0);

1961

if(ret == -1){

1962

perror_plus("setgid");

1963

_exit(EX_NOPERM);

1964

}

1965

/* Reset supplementary groups */

1966

errno = 0;

1967

ret = setgroups(0, NULL);

1968

if(ret == -1){

1969

perror_plus("setgroups");

1970

_exit(EX_NOPERM);

1971

}

1972

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

1973

if(ret == -1){

1974

perror_plus("setenv");

1975

_exit(EX_OSERR);

1976

}

1977

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

1978

if(ret == -1){

1979

perror_plus("setenv");

1980

_exit(EX_OSERR);

1981

}

1982

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

1983

if(ret == -1){

1984

perror_plus("setenv");

1985

_exit(EX_OSERR);

1986

}

1987

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

1988

if(ret == -1){

1989

perror_plus("setenv");

1990

_exit(EX_OSERR);

1991

}

1992

char *delaystring;

1993

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

1994

if(ret == -1){

1995

perror_plus("asprintf");

1996

_exit(EX_OSERR);

1997

}

1998

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

1999

if(ret == -1){

2000

free(delaystring);

2001

perror_plus("setenv");

2002

_exit(EX_OSERR);

2003

}

2004

free(delaystring);

2005

if(connect_to != NULL){

2006

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

2007

if(ret == -1){

2008

perror_plus("setenv");

2009

_exit(EX_OSERR);

2010

}

2011

}

2012

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

2013

direntry->d_name,

2014

O_RDONLY));

2015

if(hook_fd == -1){

2016

perror_plus("openat");

2017

_exit(EXIT_FAILURE);

2018

}

2019

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

2020

perror_plus("close");

2021

_exit(EXIT_FAILURE);

2022

}

2023

ret = dup2(devnull, STDIN_FILENO);

2024

if(ret == -1){

2025

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

2026

_exit(EX_OSERR);

2027

}

2028

ret = close(devnull);

2029

if(ret == -1){

2030

perror_plus("close");

2031

_exit(EX_OSERR);

2032

}

2033

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2034

if(ret == -1){

2035

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

2036

_exit(EX_OSERR);

2037

}

2038

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

2039

environ) == -1){

2040

perror_plus("fexecve");

2041

_exit(EXIT_FAILURE);

2042

}

2043

} else {

2044

if(hook_pid == -1){

2045

perror_plus("fork");

2046

free(direntry);

2047

continue;

2048

}

2049

int status;

2050

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

2051

perror_plus("waitpid");

2052

free(direntry);

2053

continue;

2054

}

2055

if(WIFEXITED(status)){

2056

if(WEXITSTATUS(status) != 0){

2057

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

2058

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

2059

WEXITSTATUS(status));

2060

free(direntry);

2061

continue;

2062

}

2063

} else if(WIFSIGNALED(status)){

2064

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

2065

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

2066

WTERMSIG(status));

2067

free(direntry);

2068

continue;

2069

} else {

2070

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

2071

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

2072

free(direntry);

2073

continue;

2074

}

2075

}

2076

if(debug){

2077

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

2078

direntry->d_name);

2079

}

2080

free(direntry);

2081

}

2082

free(direntries);

2083

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

2084

perror_plus("close");

2085

} else {

2086

hookdir_fd = -1;

2087

}

2088

close(devnull);

2089

}

2090

2091

__attribute__((nonnull, warn_unused_result))

2092

int bring_up_interface(const char *const interface,

2093

const float delay){

2094

int old_errno = errno;

2095

int ret;

2096

struct ifreq network;

2097

unsigned int if_index = if_nametoindex(interface);

2098

if(if_index == 0){

2099

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

2100

errno = old_errno;

2101

return ENXIO;

2102

}

2103

2104

if(quit_now){

2105

errno = old_errno;

2106

return EINTR;

2107

}

2108

2109

if(not interface_is_up(interface)){

2110

int ret_errno = 0;

2111

int ioctl_errno = 0;

2112

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

2113

ret_errno = errno;

2114

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

2115

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

2116

errno = old_errno;

2117

return ret_errno;

2118

}

2119

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

2120

2121

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

2122

if(sd == -1){

2123

ret_errno = errno;

2124

perror_plus("socket");

2125

errno = old_errno;

2126

return ret_errno;

2127

}

2128

2129

if(quit_now){

2130

ret = close(sd);

2131

if(ret == -1){

2132

perror_plus("close");

2133

}

2134

errno = old_errno;

2135

return EINTR;

2136

}

2137

2138

if(debug){

2139

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

2140

interface);

2141

}

2142

2143

/* Raise privileges */

2144

ret_errno = raise_privileges();

2145

if(ret_errno != 0){

2146

errno = ret_errno;

2147

perror_plus("Failed to raise privileges");

2148

}

2149

2150

#ifdef __linux__

2151

int ret_linux;

2152

bool restore_loglevel = false;

2153

if(ret_errno == 0){

2154

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2155

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

2156

ret_linux = klogctl(8, NULL, 5);

2157

if(ret_linux == -1){

2158

perror_plus("klogctl");

2159

} else {

2160

restore_loglevel = true;

2161

}

2162

}

2163

#endif /* __linux__ */

2164

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

2165

ioctl_errno = errno;

2166

#ifdef __linux__

2167

if(restore_loglevel){

2168

ret_linux = klogctl(7, NULL, 0);

2169

if(ret_linux == -1){

2170

perror_plus("klogctl");

2171

}

2172

}

2173

#endif /* __linux__ */

2174

2175

/* If raise_privileges() succeeded above */

2176

if(ret_errno == 0){

2177

/* Lower privileges */

2178

ret_errno = lower_privileges();

2179

if(ret_errno != 0){

2180

errno = ret_errno;

2181

perror_plus("Failed to lower privileges");

2182

}

2183

}

2184

2185

/* Close the socket */

2186

ret = close(sd);

2187

if(ret == -1){

2188

perror_plus("close");

2189

}

2190

2191

if(ret_setflags == -1){

2192

errno = ioctl_errno;

2193

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2194

errno = old_errno;

2195

return ioctl_errno;

2196

}

2197

} else if(debug){

2198

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

2199

interface);

2200

}

2201

2202

/* Sleep checking until interface is running.

2203

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

2204

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

2205

if(interface_is_running(interface)){

1070

2206

break;

1071

2207

}

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;

2208

struct timespec sleeptime = { .tv_nsec = 250000000 };

2209

ret = nanosleep(&sleeptime, NULL);

2210

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

2211

perror_plus("nanosleep");

2212

}

2213

}

2214

2215

errno = old_errno;

2216

return 0;

2217

}

2218

2219

__attribute__((nonnull, warn_unused_result))

2220

int take_down_interface(const char *const interface){

2221

int old_errno = errno;

2222

struct ifreq network;

2223

unsigned int if_index = if_nametoindex(interface);

2224

if(if_index == 0){

2225

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

2226

errno = old_errno;

2227

return ENXIO;

2228

}

2229

if(interface_is_up(interface)){

2230

int ret_errno = 0;

2231

int ioctl_errno = 0;

2232

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

2233

ret_errno = errno;

2234

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

2235

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

2236

errno = old_errno;

2237

return ret_errno;

2238

}

2239

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

2240

2241

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

2242

if(sd == -1){

2243

ret_errno = errno;

2244

perror_plus("socket");

2245

errno = old_errno;

2246

return ret_errno;

2247

}

2248

2249

if(debug){

2250

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

2251

interface);

2252

}

2253

2254

/* Raise privileges */

2255

ret_errno = raise_privileges();

2256

if(ret_errno != 0){

2257

errno = ret_errno;

2258

perror_plus("Failed to raise privileges");

2259

}

2260

2261

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

2262

ioctl_errno = errno;

2263

2264

/* If raise_privileges() succeeded above */

2265

if(ret_errno == 0){

2266

/* Lower privileges */

2267

ret_errno = lower_privileges();

2268

if(ret_errno != 0){

2269

errno = ret_errno;

2270

perror_plus("Failed to lower privileges");

2271

}

2272

}

2273

2274

/* Close the socket */

2275

int ret = close(sd);

2276

if(ret == -1){

2277

perror_plus("close");

2278

}

2279

2280

if(ret_setflags == -1){

2281

errno = ioctl_errno;

2282

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2283

errno = old_errno;

2284

return ioctl_errno;

2285

}

2286

} else if(debug){

2287

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

2288

interface);

2289

}

2290

2291

errno = old_errno;

2292

return 0;

1120

2293

}

1121

2294

1122

2295

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

2296

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

2297

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

2298

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

2299

.current_server = NULL, .interfaces = NULL,

2300

.interfaces_size = 0 };

1123

2301

AvahiSServiceBrowser *sb = NULL;

1124

int error;

2302

error_t ret_errno;

1125

2303

int ret;

1126

2304

intmax_t tmpmax;

1127

2305

char *tmp;

1128

2306

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;

2307

char *interfaces_to_take_down = NULL;

2308

size_t interfaces_to_take_down_size = 0;

2309

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

2310

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

2311

char *tempdir = NULL;

1137

2312

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1138

2313

const char *seckey = PATHDIR "/" SECKEY;

1139

2314

const char *pubkey = PATHDIR "/" PUBKEY;

2315

const char *dh_params_file = NULL;

2316

char *interfaces_hooks = NULL;

1140

2317

1141

2318

bool gnutls_initialized = false;

1142

2319

bool gpgme_initialized = false;

1143

2320

float delay = 2.5f;

2321

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

2322

retrying the same server again */

1144

2323

1145

2324

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

2325

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1152

2331

errno = 0;

1153

2332

ret = setgid(gid);

1154

2333

if(ret == -1){

1155

perror("setgid");

2334

perror_plus("setgid");

1156

2335

}

1157

2336

1158

2337

/* Lower user privileges (temporarily) */

1159

2338

errno = 0;

1160

2339

ret = seteuid(uid);

1161

2340

if(ret == -1){

1162

perror("seteuid");

2341

perror_plus("seteuid");

1163

2342

}

1164

2343

1165

2344

if(quit_now){

1192

2371

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

1193

2372

" Diffie-Hellman key exchange",

1194

2373

.group = 2 },

2374

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

2375

.arg = "FILE",

2376

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

2377

" for the Diffie-Hellman key exchange",

2378

.group = 2 },

1195

2379

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

1196

2380

.arg = "STRING",

1197

2381

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

1200

2384

.arg = "SECONDS",

1201

2385

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

1202

2386

.group = 2 },

2387

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

2388

.arg = "SECONDS",

2389

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

2390

.group = 2 },

2391

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

2392

.arg = "DIR",

2393

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

2394

.group = 2 },

1203

2395

/*

1204

2396

* These reproduce what we would get without ARGP_NO_HELP

1205

2397

*/

1223

2415

connect_to = arg;

1224

2416

break;

1225

2417

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

1226

interface = arg;

2418

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

2419

arg, (int)',');

2420

if(ret_errno != 0){

2421

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

2422

}

1227

2423

break;

1228

2424

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

1229

2425

seckey = arg;

1240

2436

}

1241

2437

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

1242

2438

break;

2439

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

2440

dh_params_file = arg;

2441

break;

1243

2442

case 130: /* --priority */

1244

2443

mc.priority = arg;

1245

2444

break;

1249

2448

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

1250

2449

argp_error(state, "Bad delay");

1251

2450

}

2451

case 132: /* --retry */

2452

errno = 0;

2453

retry_interval = strtod(arg, &tmp);

2454

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

2455

or (retry_interval * 1000) > INT_MAX

2456

or retry_interval < 0){

2457

argp_error(state, "Bad retry interval");

2458

}

2459

break;

2460

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

2461

hookdir = arg;

1252

2462

break;

1253

2463

/*

1254

2464

* These reproduce what we would get without ARGP_NO_HELP

1261

2471

argp_state_help(state, state->out_stream,

1262

2472

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

2473

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

1264

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

2474

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

1265

2475

exit(argp_err_exit_status);

1266

2476

break;

1267

2477

default:

1274

2484

.args_doc = "",

1275

2485

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

1276

2486

" passwords from a Mandos server" };

1277

ret = argp_parse(&argp, argc, argv,

1278

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1279

switch(ret){

2487

ret_errno = argp_parse(&argp, argc, argv,

2488

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2489

switch(ret_errno){

1280

2490

case 0:

1281

2491

break;

1282

2492

case ENOMEM:

1283

2493

default:

1284

errno = ret;

1285

perror("argp_parse");

2494

errno = ret_errno;

2495

perror_plus("argp_parse");

1286

2496

exitcode = EX_OSERR;

1287

2497

goto end;

1288

2498

case EINVAL:

1291

2501

}

1292

2502

}

1293

2503

2504

{

2505

/* Work around Debian bug #633582:

2506

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

2507

2508

/* Re-raise privileges */

2509

ret = raise_privileges();

2510

if(ret != 0){

2511

errno = ret;

2512

perror_plus("Failed to raise privileges");

2513

} else {

2514

struct stat st;

2515

2516

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

2517

int seckey_fd = open(seckey, O_RDONLY);

2518

if(seckey_fd == -1){

2519

perror_plus("open");

2520

} else {

2521

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

2522

if(ret == -1){

2523

perror_plus("fstat");

2524

} else {

2525

if(S_ISREG(st.st_mode)

2526

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

2527

ret = fchown(seckey_fd, uid, gid);

2528

if(ret == -1){

2529

perror_plus("fchown");

2530

}

2531

}

2532

}

2533

close(seckey_fd);

2534

}

2535

}

2536

2537

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

2538

int pubkey_fd = open(pubkey, O_RDONLY);

2539

if(pubkey_fd == -1){

2540

perror_plus("open");

2541

} else {

2542

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

2543

if(ret == -1){

2544

perror_plus("fstat");

2545

} else {

2546

if(S_ISREG(st.st_mode)

2547

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

2548

ret = fchown(pubkey_fd, uid, gid);

2549

if(ret == -1){

2550

perror_plus("fchown");

2551

}

2552

}

2553

}

2554

close(pubkey_fd);

2555

}

2556

}

2557

2558

if(dh_params_file != NULL

2559

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

2560

int dhparams_fd = open(dh_params_file, O_RDONLY);

2561

if(dhparams_fd == -1){

2562

perror_plus("open");

2563

} else {

2564

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

2565

if(ret == -1){

2566

perror_plus("fstat");

2567

} else {

2568

if(S_ISREG(st.st_mode)

2569

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

2570

ret = fchown(dhparams_fd, uid, gid);

2571

if(ret == -1){

2572

perror_plus("fchown");

2573

}

2574

}

2575

}

2576

close(dhparams_fd);

2577

}

2578

}

2579

2580

/* Lower privileges */

2581

ret = lower_privileges();

2582

if(ret != 0){

2583

errno = ret;

2584

perror_plus("Failed to lower privileges");

2585

}

2586

}

2587

}

2588

2589

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

2590

{

2591

char *interface = NULL;

2592

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

2593

interface))){

2594

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

2595

and if_nametoindex(interface) == 0){

2596

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

2597

fprintf_plus(stderr, "Not using nonexisting interface"

2598

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

2599

}

2600

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

2601

interface = NULL;

2602

}

2603

}

2604

}

2605

2606

/* Run network hooks */

2607

{

2608

if(mc.interfaces != NULL){

2609

interfaces_hooks = malloc(mc.interfaces_size);

2610

if(interfaces_hooks == NULL){

2611

perror_plus("malloc");

2612

goto end;

2613

}

2614

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

2615

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

2616

}

2617

run_network_hooks("start", interfaces_hooks != NULL ?

2618

interfaces_hooks : "", delay);

2619

}

2620

1294

2621

if(not debug){

1295

2622

avahi_set_log_function(empty_log);

1296

2623

}

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

2624

1323

2625

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

1324

2626

from the signal handler */

1325

2627

/* Initialize the pseudo-RNG for Avahi */

1326

2628

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");

2629

simple_poll = avahi_simple_poll_new();

2630

if(simple_poll == NULL){

2631

fprintf_plus(stderr,

2632

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

1330

2633

exitcode = EX_UNAVAILABLE;

1331

2634

goto end;

1332

2635

}

1334

2637

sigemptyset(&sigterm_action.sa_mask);

1335

2638

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

1336

2639

if(ret == -1){

1337

perror("sigaddset");

2640

perror_plus("sigaddset");

1338

2641

exitcode = EX_OSERR;

1339

2642

goto end;

1340

2643

}

1341

2644

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

1342

2645

if(ret == -1){

1343

perror("sigaddset");

2646

perror_plus("sigaddset");

1344

2647

exitcode = EX_OSERR;

1345

2648

goto end;

1346

2649

}

1347

2650

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

1348

2651

if(ret == -1){

1349

perror("sigaddset");

2652

perror_plus("sigaddset");

1350

2653

exitcode = EX_OSERR;

1351

2654

goto end;

1352

2655

}

1356

2659

*/

1357

2660

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

1358

2661

if(ret == -1){

1359

perror("sigaction");

2662

perror_plus("sigaction");

1360

2663

return EX_OSERR;

1361

2664

}

1362

2665

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

2666

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

1364

2667

if(ret == -1){

1365

perror("sigaction");

2668

perror_plus("sigaction");

1366

2669

exitcode = EX_OSERR;

1367

2670

goto end;

1368

2671

}

1369

2672

}

1370

2673

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

1371

2674

if(ret == -1){

1372

perror("sigaction");

2675

perror_plus("sigaction");

1373

2676

return EX_OSERR;

1374

2677

}

1375

2678

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

2679

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

1377

2680

if(ret == -1){

1378

perror("sigaction");

2681

perror_plus("sigaction");

1379

2682

exitcode = EX_OSERR;

1380

2683

goto end;

1381

2684

}

1382

2685

}

1383

2686

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

1384

2687

if(ret == -1){

1385

perror("sigaction");

2688

perror_plus("sigaction");

1386

2689

return EX_OSERR;

1387

2690

}

1388

2691

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

2692

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

1390

2693

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");

2694

perror_plus("sigaction");

2695

exitcode = EX_OSERR;

2696

goto end;

2697

}

2698

}

2699

2700

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

2701

if(mc.interfaces == NULL){

2702

struct dirent **direntries = NULL;

2703

/* Look for any good interfaces */

2704

ret = scandir(sys_class_net, &direntries, good_interface,

2705

alphasort);

2706

if(ret >= 1){

2707

/* Add all found interfaces to interfaces list */

2708

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

2709

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

2710

direntries[i]->d_name);

2711

if(ret_errno != 0){

2712

errno = ret_errno;

2713

perror_plus("argz_add");

2714

free(direntries[i]);

2715

continue;

2716

}

2717

if(debug){

2718

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

2719

direntries[i]->d_name);

2720

}

2721

free(direntries[i]);

2722

}

2723

free(direntries);

2724

} else {

2725

if(ret == 0){

2726

free(direntries);

2727

}

2728

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

2729

exitcode = EXIT_FAILURE;

2730

goto end;

2731

}

2732

}

2733

2734

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

2735

{

2736

char *interface = NULL;

2737

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

2738

interface))){

2739

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

2740

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

2741

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

2742

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

2743

interface);

2744

interface = NULL;

2745

while((interface = argz_next(mc.interfaces,

2746

mc.interfaces_size, interface))){

2747

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

2748

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

2749

interface);

2750

interface = NULL;

1482

2751

}

1483

2752

}

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

2753

break;

1501

2754

}

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

}

2755

bool interface_was_up = interface_is_up(interface);

2756

errno = bring_up_interface(interface, delay);

2757

if(not interface_was_up){

2758

if(errno != 0){

2759

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

2760

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

2761

} else {

2762

errno = argz_add(&interfaces_to_take_down,

2763

&interfaces_to_take_down_size,

2764

interface);

2765

if(errno != 0){

2766

perror_plus("argz_add");

2767

}

2768

}

2769

}

2770

}

2771

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

2772

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

2773

}

2774

}

2775

2776

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

2777

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

2778

if(debug){

2779

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

2780

mc.interfaces);

2781

}

2782

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

1539

2783

}

1540

2784

1541

2785

if(quit_now){

1542

2786

goto end;

1543

2787

}

1544

2788

1545

ret = init_gnutls_global(pubkey, seckey);

2789

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

1546

2790

if(ret == -1){

1547

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

2791

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

1548

2792

exitcode = EX_UNAVAILABLE;

1549

2793

goto end;

1550

2794

} else {

1555

2799

goto end;

1556

2800

}

1557

2801

1558

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

2802

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

2803

tempdir = mkdtemp(run_tempdir);

2804

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

2805

if(debug){

2806

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

2807

run_tempdir, old_tempdir);

2808

}

2809

tempdir = mkdtemp(old_tempdir);

2810

}

2811

if(tempdir == NULL){

2812

perror_plus("mkdtemp");

1562

2813

goto end;

1563

2814

}

1564

2815

1566

2817

goto end;

1567

2818

}

1568

2819

1569

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

1570

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

2820

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

2821

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

1571

2822

exitcode = EX_UNAVAILABLE;

1572

2823

goto end;

1573

2824

} else {

1582

2833

/* Connect directly, do not use Zeroconf */

1583

2834

/* (Mainly meant for debugging) */

1584

2835

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

2836

1585

2837

if(address == NULL){

1586

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

2838

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

1587

2839

exitcode = EX_USAGE;

1588

2840

goto end;

1589

2841

}

1592

2844

goto end;

1593

2845

}

1594

2846

1595

uint16_t port;

2847

in_port_t port;

1596

2848

errno = 0;

1597

2849

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

1598

2850

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

1599

or tmpmax != (uint16_t)tmpmax){

1600

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

2851

or tmpmax != (in_port_t)tmpmax){

2852

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

1601

2853

exitcode = EX_USAGE;

1602

2854

goto end;

1603

2855

}

1604

2856

1605

2857

if(quit_now){

1606

2858

goto end;

1607

2859

}

1608

2860

1609

port = (uint16_t)tmpmax;

2861

port = (in_port_t)tmpmax;

1610

2862

*address = '\0';

1611

address = connect_to;

1612

2863

/* Colon in address indicates IPv6 */

1613

2864

int af;

1614

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

2865

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

1615

2866

af = AF_INET6;

2867

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

2868

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

2869

{

2870

connect_to++;

2871

address[-1] = '\0';

2872

}

1616

2873

} else {

1617

2874

af = AF_INET;

1618

2875

}

2876

address = connect_to;

1619

2877

1620

2878

if(quit_now){

1621

2879

goto end;

1622

2880

}

1623

2881

1624

2882

while(not quit_now){

1625

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

2883

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

2884

&mc);

1626

2885

if(quit_now or ret == 0){

1627

2886

break;

1628

2887

}

1629

sleep(15);

1630

};

1631

1632

if (not quit_now){

2888

if(debug){

2889

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

2890

(int)retry_interval);

2891

}

2892

sleep((unsigned int)retry_interval);

2893

}

2894

2895

if(not quit_now){

1633

2896

exitcode = EXIT_SUCCESS;

1634

2897

}

1635

2898

1636

2899

goto end;

1637

2900

}

1638

2901

1650

2913

config.publish_domain = 0;

1651

2914

1652

2915

/* Allocate a new server */

1653

mc.server = avahi_server_new(avahi_simple_poll_get

1654

(mc.simple_poll), &config, NULL,

1655

NULL, &error);

2916

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2917

&config, NULL, NULL, &ret);

1656

2918

1657

2919

/* Free the Avahi configuration data */

1658

2920

avahi_server_config_free(&config);

1660

2922

1661

2923

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

1662

2924

if(mc.server == NULL){

1663

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

1664

avahi_strerror(error));

2925

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

2926

avahi_strerror(ret));

1665

2927

exitcode = EX_UNAVAILABLE;

1666

2928

goto end;

1667

2929

}

1673

2935

/* Create the Avahi service browser */

1674

2936

sb = avahi_s_service_browser_new(mc.server, if_index,

1675

2937

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1676

NULL, 0, browse_callback, NULL);

2938

NULL, 0, browse_callback,

2939

(void *)&mc);

1677

2940

if(sb == NULL){

1678

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

1679

avahi_strerror(avahi_server_errno(mc.server)));

2941

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

2942

avahi_strerror(avahi_server_errno(mc.server)));

1680

2943

exitcode = EX_UNAVAILABLE;

1681

2944

goto end;

1682

2945

}

1688

2951

/* Run the main loop */

1689

2952

1690

2953

if(debug){

1691

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

2954

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

1692

2955

}

1693

2956

1694

avahi_simple_poll_loop(mc.simple_poll);

2957

ret = avahi_loop_with_timeout(simple_poll,

2958

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

2959

if(debug){

2960

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

2961

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

2962

}

1695

2963

1696

2964

end:

1697

2965

1698

2966

if(debug){

1699

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

2967

if(signal_received){

2968

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

2969

argv[0], signal_received,

2970

strsignal(signal_received));

2971

} else {

2972

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

2973

}

1700

2974

}

1701

2975

1702

2976

/* Cleanup things */

2977

free(mc.interfaces);

2978

1703

2979

if(sb != NULL)

1704

2980

avahi_s_service_browser_free(sb);

1705

2981

1706

2982

if(mc.server != NULL)

1707

2983

avahi_server_free(mc.server);

1708

2984

1709

if(mc.simple_poll != NULL)

1710

avahi_simple_poll_free(mc.simple_poll);

2985

if(simple_poll != NULL)

2986

avahi_simple_poll_free(simple_poll);

1711

2987

1712

2988

if(gnutls_initialized){

1713

2989

gnutls_certificate_free_credentials(mc.cred);

1714

gnutls_global_deinit();

1715

2990

gnutls_dh_params_deinit(mc.dh_params);

1716

2991

}

1717

2992

1719

2994

gpgme_release(mc.ctx);

1720

2995

}

1721

2996

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

}

2997

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

2998

has seen */

2999

if(mc.current_server != NULL){

3000

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

3001

while(mc.current_server != NULL){

3002

server *next = mc.current_server->next;

3003

#ifdef __GNUC__

3004

#pragma GCC diagnostic push

3005

#pragma GCC diagnostic ignored "-Wcast-qual"

3006

#endif

3007

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

3008

#ifdef __GNUC__

3009

#pragma GCC diagnostic pop

3010

#endif

3011

free(mc.current_server);

3012

mc.current_server = next;

3013

}

3014

}

3015

3016

/* Re-raise privileges */

3017

{

3018

ret = raise_privileges();

3019

if(ret != 0){

3020

errno = ret;

3021

perror_plus("Failed to raise privileges");

3022

} else {

3023

3024

/* Run network hooks */

3025

run_network_hooks("stop", interfaces_hooks != NULL ?

3026

interfaces_hooks : "", delay);

3027

3028

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

3029

{

3030

char *interface = NULL;

3031

while((interface = argz_next(interfaces_to_take_down,

3032

interfaces_to_take_down_size,

3033

interface))){

3034

ret = take_down_interface(interface);

3035

if(ret != 0){

3036

errno = ret;

3037

perror_plus("Failed to take down interface");

3038

}

3039

}

3040

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

3041

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

3042

" down\n");

3043

}

3044

}

3045

}

3046

3047

ret = lower_privileges_permanently();

3048

if(ret != 0){

3049

errno = ret;

3050

perror_plus("Failed to lower privileges permanently");

3051

}

3052

}

3053

3054

free(interfaces_to_take_down);

3055

free(interfaces_hooks);

3056

3057

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

3058

uintmax_t level){

3059

struct dirent **direntries = NULL;

3060

int dret;

3061

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

3062

O_RDONLY

3063

| O_NOFOLLOW

3064

| O_DIRECTORY

3065

| O_PATH));

3066

if(dir_fd == -1){

3067

perror_plus("open");

3068

return;

3069

}

3070

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

3071

notdotentries, alphasort);

3072

if(numentries >= 0){

3073

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

3074

if(debug){

3075

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

3076

dirname, direntries[i]->d_name);

3077

}

3078

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

3079

if(dret == -1){

3080

if(errno == EISDIR){

3081

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

3082

AT_REMOVEDIR);

3083

}

3084

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

3085

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

3086

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

3087

/* Recurse only in this special case */

3088

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

3089

dret = 0;

3090

}

3091

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

3092

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

3093

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

3094

}

3095

}

3096

free(direntries[i]);

3097

}

3098

3099

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

3100

free(direntries);

3101

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3102

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

3103

perror_plus("rmdir");

3104

}

3105

} else {

3106

perror_plus("scandirat");

3107

}

3108

close(dir_fd);

3109

}

3110

3111

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

3112

if(tempdir != NULL){

3113

clean_dir_at(-1, tempdir, 0);

1796

3114

}

1797

3115

1798

3116

if(quit_now){

1802

3120

&old_sigterm_action,

1803

3121

NULL));

1804

3122

if(ret == -1){

1805

perror("sigaction");

3123

perror_plus("sigaction");

1806

3124

}

1807

3125

do {

1808

3126

ret = raise(signal_received);

1809

3127

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

1810

3128

if(ret != 0){

1811

perror("raise");

3129

perror_plus("raise");

1812

3130

abort();

1813

3131

}

1814

3132

TEMP_FAILURE_RETRY(pause());