/mandos/release : revision 237.7.490

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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 <time.h> /* nanosleep(), time() */

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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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if_nametoindex(), IF_NAMESIZE */

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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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143

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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;

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168

AvahiServer *server;

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169

gnutls_certificate_credentials_t cred;

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170

unsigned int dh_bits;

137

171

gnutls_dh_params_t dh_params;

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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;

140

177

} mandos_context;

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178

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

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

144

.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;

146

181

147

182

sig_atomic_t quit_now = 0;

148

183

int signal_received = 0;

149

184

185

/* Function to use when printing errors */

186

void perror_plus(const char *print_text){

187

int e = errno;

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

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program_invocation_short_name);

190

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, ...){

196

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

150

204

/*

151

205

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

152

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

153

207

* "buffer_length" is how much is already used.

154

208

*/

209

__attribute__((nonnull, warn_unused_result))

155

210

size_t incbuffer(char **buffer, size_t buffer_length,

156

size_t buffer_capacity){

211

size_t buffer_capacity){

157

212

if(buffer_length + BUFFER_SIZE > buffer_capacity){

158

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

159

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;

160

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return 0;

161

220

}

221

*buffer = new_buf;

162

222

buffer_capacity += BUFFER_SIZE;

163

223

}

164

224

return buffer_capacity;

165

225

}

166

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,

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.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

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

254

#ifdef __GNUC__

255

#pragma GCC diagnostic pop

256

#endif

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free(new_server);

258

return false;

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}

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/* Special case of first server */

261

if(*current_server == NULL){

262

new_server->next = new_server;

263

new_server->prev = new_server;

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*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;

271

}

272

return true;

273

}

274

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/*

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* Initialize GPGME.

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*/

170

static bool init_gpgme(const char *seckey,

171

const char *pubkey, const char *tempdir){

278

__attribute__((nonnull, warn_unused_result))

279

static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

281

const char * const tempdir,

282

mandos_context *mc){

172

283

gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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285

175

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286

/*

177

287

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

178

288

*/

179

bool import_key(const char *filename){

289

bool import_key(const char * const filename){

180

290

int ret;

181

291

int fd;

182

292

gpgme_data_t pgp_data;

183

293

184

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

185

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if(fd == -1){

186

perror("open");

296

perror_plus("open");

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297

return false;

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}

189

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190

300

rc = gpgme_data_new_from_fd(&pgp_data, fd);

191

301

if(rc != GPG_ERR_NO_ERROR){

192

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));

194

304

return false;

195

305

}

196

306

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rc = gpgme_op_import(mc.ctx, pgp_data);

307

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

198

308

if(rc != GPG_ERR_NO_ERROR){

199

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

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gpgme_strsource(rc), gpgme_strerror(rc));

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

201

311

return false;

202

312

}

203

313

204

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

314

ret = close(fd);

205

315

if(ret == -1){

206

perror("close");

316

perror_plus("close");

207

317

}

208

318

gpgme_data_release(pgp_data);

209

319

return true;

210

320

}

211

321

212

322

if(debug){

213

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

323

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

214

324

}

215

325

216

326

/* Init GPGME */

217

327

gpgme_check_version(NULL);

218

328

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

219

329

if(rc != GPG_ERR_NO_ERROR){

220

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

221

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));

222

332

return false;

223

333

}

224

334

225

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

335

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

226

336

rc = gpgme_get_engine_info(&engine_info);

227

337

if(rc != GPG_ERR_NO_ERROR){

228

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

229

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));

230

340

return false;

231

341

}

232

342

while(engine_info != NULL){

238

348

engine_info = engine_info->next;

239

349

}

240

350

if(engine_info == NULL){

241

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);

242

353

return false;

243

354

}

244

355

245

356

/* Create new GPGME "context" */

246

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

357

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

247

358

if(rc != GPG_ERR_NO_ERROR){

248

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

249

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));

250

362

return false;

251

363

}

252

364

261

373

* Decrypt OpenPGP data.

262

374

* Returns -1 on error

263

375

*/

376

__attribute__((nonnull, warn_unused_result))

264

377

static ssize_t pgp_packet_decrypt(const char *cryptotext,

265

378

size_t crypto_size,

266

char **plaintext){

379

char **plaintext,

380

mandos_context *mc){

267

381

gpgme_data_t dh_crypto, dh_plain;

268

382

gpgme_error_t rc;

269

383

ssize_t ret;

271

385

ssize_t plaintext_length = 0;

272

386

273

387

if(debug){

274

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

388

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

275

389

}

276

390

277

391

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

278

392

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

279

393

0);

280

394

if(rc != GPG_ERR_NO_ERROR){

281

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

282

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));

283

397

return -1;

284

398

}

285

399

286

400

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

287

401

rc = gpgme_data_new(&dh_plain);

288

402

if(rc != GPG_ERR_NO_ERROR){

289

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

290

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));

291

406

gpgme_data_release(dh_crypto);

292

407

return -1;

293

408

}

294

409

295

410

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

296

411

data buffer */

297

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

412

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

298

413

if(rc != GPG_ERR_NO_ERROR){

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

414

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

415

gpgme_strsource(rc), gpgme_strerror(rc));

301

416

plaintext_length = -1;

302

417

if(debug){

303

418

gpgme_decrypt_result_t result;

304

result = gpgme_op_decrypt_result(mc.ctx);

419

result = gpgme_op_decrypt_result(mc->ctx);

305

420

if(result == NULL){

306

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

421

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

307

422

} else {

308

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

309

result->unsupported_algorithm);

310

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

311

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);

312

427

if(result->file_name != NULL){

313

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

428

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

314

429

}

315

430

gpgme_recipient_t recipient;

316

431

recipient = result->recipients;

317

432

while(recipient != NULL){

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "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");

324

440

recipient = recipient->next;

325

441

}

326

442

}

329

445

}

330

446

331

447

if(debug){

332

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

448

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

333

449

}

334

450

335

451

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

336

452

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

337

perror("gpgme_data_seek");

453

perror_plus("gpgme_data_seek");

338

454

plaintext_length = -1;

339

455

goto decrypt_end;

340

456

}

342

458

*plaintext = NULL;

343

459

while(true){

344

460

plaintext_capacity = incbuffer(plaintext,

345

(size_t)plaintext_length,

346

plaintext_capacity);

461

(size_t)plaintext_length,

462

plaintext_capacity);

347

463

if(plaintext_capacity == 0){

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

464

perror_plus("incbuffer");

465

plaintext_length = -1;

466

goto decrypt_end;

351

467

}

352

468

353

469

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

358

474

break;

359

475

}

360

476

if(ret < 0){

361

perror("gpgme_data_read");

477

perror_plus("gpgme_data_read");

362

478

plaintext_length = -1;

363

479

goto decrypt_end;

364

480

}

366

482

}

367

483

368

484

if(debug){

369

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

485

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

370

486

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

371

487

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

372

488

}

383

499

return plaintext_length;

384

500

}

385

501

386

static const char * safer_gnutls_strerror(int value){

387

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

388

-Wunreachable-code */

389

if(ret == NULL)

390

ret = "(unknown)";

391

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);

392

513

}

393

514

394

515

/* GnuTLS log function callback */

516

__attribute__((nonnull))

395

517

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

396

518

const char* string){

397

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

519

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

398

520

}

399

521

522

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

400

523

static int init_gnutls_global(const char *pubkeyfilename,

401

const char *seckeyfilename){

524

const char *seckeyfilename,

525

const char *dhparamsfilename,

526

mandos_context *mc){

402

527

int ret;

528

unsigned int uret;

403

529

404

530

if(debug){

405

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

406

}

407

408

ret = gnutls_global_init();

409

if(ret != GNUTLS_E_SUCCESS){

410

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

411

safer_gnutls_strerror(ret));

412

return -1;

531

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

413

532

}

414

533

415

534

if(debug){

421

540

}

422

541

423

542

/* OpenPGP credentials */

424

gnutls_certificate_allocate_credentials(&mc.cred);

543

ret = gnutls_certificate_allocate_credentials(&mc->cred);

425

544

if(ret != GNUTLS_E_SUCCESS){

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

431

gnutls_global_deinit();

545

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

546

safer_gnutls_strerror(ret));

432

547

return -1;

433

548

}

434

549

435

550

if(debug){

436

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

437

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

438

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);

439

555

}

440

556

441

557

ret = gnutls_certificate_set_openpgp_key_file

442

(mc.cred, pubkeyfilename, seckeyfilename,

558

(mc->cred, pubkeyfilename, seckeyfilename,

443

559

GNUTLS_OPENPGP_FMT_BASE64);

444

560

if(ret != GNUTLS_E_SUCCESS){

445

fprintf(stderr,

446

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

447

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

448

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

449

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));

450

566

goto globalfail;

451

567

}

452

568

453

569

/* GnuTLS server initialization */

454

ret = gnutls_dh_params_init(&mc.dh_params);

455

if(ret != GNUTLS_E_SUCCESS){

456

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

457

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

458

goto globalfail;

459

}

460

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

461

if(ret != GNUTLS_E_SUCCESS){

462

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

463

safer_gnutls_strerror(ret));

464

goto globalfail;

465

}

466

467

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

ret = close(dhpfile);

617

if(ret == -1){

618

perror_plus("close");

619

}

620

if(params.data == NULL){

621

dhparamsfilename = NULL;

622

}

623

if(dhparamsfilename == NULL){

624

break;

625

}

626

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

627

GNUTLS_X509_FMT_PEM);

628

if(ret != GNUTLS_E_SUCCESS){

629

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

630

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

631

safer_gnutls_strerror(ret));

632

dhparamsfilename = NULL;

633

}

634

free(params.data);

635

} while(false);

636

}

637

if(dhparamsfilename == NULL){

638

if(mc->dh_bits == 0){

639

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

640

/* Try to read the private key file */

641

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

642

do {

643

int secfile = open(seckeyfilename, O_RDONLY);

644

if(secfile == -1){

645

perror_plus("open");

646

break;

647

}

648

size_t buffer_capacity = 0;

649

while(true){

650

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

651

(size_t)buffer.size,

652

(size_t)buffer_capacity);

653

if(buffer_capacity == 0){

654

perror_plus("incbuffer");

655

free(buffer.data);

656

buffer.data = NULL;

657

break;

658

}

659

ssize_t bytes_read = read(secfile,

660

buffer.data + buffer.size,

661

BUFFER_SIZE);

662

/* EOF */

663

if(bytes_read == 0){

664

break;

665

}

666

/* check bytes_read for failure */

667

if(bytes_read < 0){

668

perror_plus("read");

669

free(buffer.data);

670

buffer.data = NULL;

671

break;

672

}

673

buffer.size += (unsigned int)bytes_read;

674

}

675

close(secfile);

676

} while(false);

677

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

678

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

679

if(buffer.data != NULL){

680

{

681

gnutls_openpgp_privkey_t privkey = NULL;

682

ret = gnutls_openpgp_privkey_init(&privkey);

683

if(ret != GNUTLS_E_SUCCESS){

684

fprintf_plus(stderr, "Error initializing OpenPGP key"

685

" structure: %s",

686

safer_gnutls_strerror(ret));

687

free(buffer.data);

688

buffer.data = NULL;

689

} else {

690

ret = gnutls_openpgp_privkey_import

691

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

692

if(ret != GNUTLS_E_SUCCESS){

693

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

694

safer_gnutls_strerror(ret));

695

privkey = NULL;

696

}

697

free(buffer.data);

698

buffer.data = NULL;

699

if(privkey != NULL){

700

/* Use private key to suggest an appropriate

701

sec_param */

702

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

703

gnutls_openpgp_privkey_deinit(privkey);

704

if(debug){

705

fprintf_plus(stderr, "This OpenPGP key implies using"

706

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

707

safe_string(gnutls_sec_param_get_name

708

(sec_param)));

709

}

710

}

711

}

712

}

713

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

714

/* Err on the side of caution */

715

sec_param = GNUTLS_SEC_PARAM_ULTRA;

716

if(debug){

717

fprintf_plus(stderr, "Falling back to security parameter"

718

" \"%s\"\n",

719

safe_string(gnutls_sec_param_get_name

720

(sec_param)));

721

}

722

}

723

}

724

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

725

if(uret != 0){

726

mc->dh_bits = uret;

727

if(debug){

728

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

729

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

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

mc->dh_bits);

733

}

734

} else {

735

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

736

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

737

safe_string(gnutls_sec_param_get_name

738

(sec_param)),

739

safer_gnutls_strerror(ret));

740

goto globalfail;

741

}

742

} else if(debug){

743

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

744

mc->dh_bits);

745

}

746

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

747

if(ret != GNUTLS_E_SUCCESS){

748

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

749

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

750

safer_gnutls_strerror(ret));

751

goto globalfail;

752

}

753

}

754

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

468

755

469

756

return 0;

470

757

471

758

globalfail:

472

759

473

gnutls_certificate_free_credentials(mc.cred);

474

gnutls_global_deinit();

475

gnutls_dh_params_deinit(mc.dh_params);

760

gnutls_certificate_free_credentials(mc->cred);

761

gnutls_dh_params_deinit(mc->dh_params);

476

762

return -1;

477

763

}

478

764

479

static int init_gnutls_session(gnutls_session_t *session){

765

__attribute__((nonnull, warn_unused_result))

766

static int init_gnutls_session(gnutls_session_t *session,

767

mandos_context *mc){

480

768

int ret;

481

769

/* GnuTLS session creation */

482

770

do {

486

774

}

487

775

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

488

776

if(ret != GNUTLS_E_SUCCESS){

489

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

490

safer_gnutls_strerror(ret));

777

fprintf_plus(stderr,

778

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

779

safer_gnutls_strerror(ret));

491

780

}

492

781

493

782

{

494

783

const char *err;

495

784

do {

496

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

785

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

497

786

if(quit_now){

498

787

gnutls_deinit(*session);

499

788

return -1;

500

789

}

501

790

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

502

791

if(ret != GNUTLS_E_SUCCESS){

503

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

504

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

505

safer_gnutls_strerror(ret));

792

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

793

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

794

safer_gnutls_strerror(ret));

506

795

gnutls_deinit(*session);

507

796

return -1;

508

797

}

510

799

511

800

do {

512

801

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

802

mc->cred);

514

803

if(quit_now){

515

804

gnutls_deinit(*session);

516

805

return -1;

517

806

}

518

807

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

519

808

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

809

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

810

safer_gnutls_strerror(ret));

522

811

gnutls_deinit(*session);

523

812

return -1;

524

813

}

526

815

/* ignore client certificate if any. */

527

816

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

528

817

529

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

531

818

return 0;

532

819

}

533

820

535

822

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

536

823

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

537

824

825

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

826

__attribute__((warn_unused_result))

827

int raise_privileges(void){

828

int old_errno = errno;

829

int ret = 0;

830

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

831

ret = errno;

832

}

833

errno = old_errno;

834

return ret;

835

}

836

837

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

838

__attribute__((warn_unused_result))

839

int raise_privileges_permanently(void){

840

int old_errno = errno;

841

int ret = raise_privileges();

842

if(ret != 0){

843

errno = old_errno;

844

return ret;

845

}

846

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

847

ret = errno;

848

}

849

errno = old_errno;

850

return ret;

851

}

852

853

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

854

__attribute__((warn_unused_result))

855

int lower_privileges(void){

856

int old_errno = errno;

857

int ret = 0;

858

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

859

ret = errno;

860

}

861

errno = old_errno;

862

return ret;

863

}

864

865

/* Lower privileges permanently */

866

__attribute__((warn_unused_result))

867

int lower_privileges_permanently(void){

868

int old_errno = errno;

869

int ret = 0;

870

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

871

ret = errno;

872

}

873

errno = old_errno;

874

return ret;

875

}

876

877

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

878

__attribute__((nonnull, warn_unused_result))

879

static bool add_delete_local_route(const bool add,

880

const char *address,

881

AvahiIfIndex if_index){

882

int ret;

883

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

884

char add_arg[] = "add";

885

char delete_arg[] = "delete";

886

char debug_flag[] = "--debug";

887

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

888

if(pluginhelperdir == NULL){

889

if(debug){

890

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

891

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

892

}

893

return false;

894

}

895

896

char interface[IF_NAMESIZE];

897

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

898

perror_plus("if_indextoname");

899

return false;

900

}

901

902

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

903

if(devnull == -1){

904

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

905

return false;

906

}

907

pid_t pid = fork();

908

if(pid == 0){

909

/* Child */

910

/* Raise privileges */

911

errno = raise_privileges_permanently();

912

if(errno != 0){

913

perror_plus("Failed to raise privileges");

914

/* _exit(EX_NOPERM); */

915

} else {

916

/* Set group */

917

errno = 0;

918

ret = setgid(0);

919

if(ret == -1){

920

perror_plus("setgid");

921

_exit(EX_NOPERM);

922

}

923

/* Reset supplementary groups */

924

errno = 0;

925

ret = setgroups(0, NULL);

926

if(ret == -1){

927

perror_plus("setgroups");

928

_exit(EX_NOPERM);

929

}

930

}

931

ret = dup2(devnull, STDIN_FILENO);

932

if(ret == -1){

933

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

934

_exit(EX_OSERR);

935

}

936

ret = close(devnull);

937

if(ret == -1){

938

perror_plus("close");

939

_exit(EX_OSERR);

940

}

941

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

942

if(ret == -1){

943

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

944

_exit(EX_OSERR);

945

}

946

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

947

O_RDONLY

948

| O_DIRECTORY

949

| O_PATH

950

| O_CLOEXEC));

951

if(helperdir_fd == -1){

952

perror_plus("open");

953

_exit(EX_UNAVAILABLE);

954

}

955

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

956

helper, O_RDONLY));

957

if(helper_fd == -1){

958

perror_plus("openat");

959

close(helperdir_fd);

960

_exit(EX_UNAVAILABLE);

961

}

962

close(helperdir_fd);

963

#ifdef __GNUC__

964

#pragma GCC diagnostic push

965

#pragma GCC diagnostic ignored "-Wcast-qual"

966

#endif

967

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

968

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

969

interface, debug ? debug_flag : NULL, NULL },

970

environ) == -1){

971

#ifdef __GNUC__

972

#pragma GCC diagnostic pop

973

#endif

974

perror_plus("fexecve");

975

_exit(EXIT_FAILURE);

976

}

977

}

978

if(pid == -1){

979

perror_plus("fork");

980

return false;

981

}

982

int status;

983

pid_t pret = -1;

984

errno = 0;

985

do {

986

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

987

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

988

int errno_raising = 0;

989

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

990

errno_raising = errno;

991

perror_plus("Failed to raise privileges in order to"

992

" kill helper program");

993

}

994

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

995

perror_plus("kill");

996

}

997

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

998

perror_plus("Failed to lower privileges after killing"

999

" helper program");

1000

}

1001

return false;

1002

}

1003

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

1004

if(pret == -1){

1005

perror_plus("waitpid");

1006

return false;

1007

}

1008

if(WIFEXITED(status)){

1009

if(WEXITSTATUS(status) != 0){

1010

fprintf_plus(stderr, "Error: iprouteadddel exited"

1011

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

1012

return false;

1013

}

1014

return true;

1015

}

1016

if(WIFSIGNALED(status)){

1017

fprintf_plus(stderr, "Error: iprouteadddel died by"

1018

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

1019

return false;

1020

}

1021

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

1022

return false;

1023

}

1024

1025

__attribute__((nonnull, warn_unused_result))

1026

static bool add_local_route(const char *address,

1027

AvahiIfIndex if_index){

1028

if(debug){

1029

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

1030

}

1031

return add_delete_local_route(true, address, if_index);

1032

}

1033

1034

__attribute__((nonnull, warn_unused_result))

1035

static bool delete_local_route(const char *address,

1036

AvahiIfIndex if_index){

1037

if(debug){

1038

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

1039

}

1040

return add_delete_local_route(false, address, if_index);

1041

}

1042

538

1043

/* Called when a Mandos server is found */

539

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

1044

__attribute__((nonnull, warn_unused_result))

1045

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

540

1046

AvahiIfIndex if_index,

541

int af){

1047

int af, mandos_context *mc){

542

1048

int ret, tcp_sd = -1;

543

1049

ssize_t sret;

544

union {

545

struct sockaddr_in in;

546

struct sockaddr_in6 in6;

547

} to;

1050

struct sockaddr_storage to;

548

1051

char *buffer = NULL;

549

1052

char *decrypted_buffer = NULL;

550

1053

size_t buffer_length = 0;

553

1056

int retval = -1;

554

1057

gnutls_session_t session;

555

1058

int pf; /* Protocol family */

1059

bool route_added = false;

556

1060

557

1061

errno = 0;

558

1062

569

1073

pf = PF_INET;

570

1074

break;

571

1075

default:

572

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

1076

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

573

1077

errno = EINVAL;

574

1078

return -1;

575

1079

}

576

1080

577

ret = init_gnutls_session(&session);

1081

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

1082

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

1083

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

1084

bool match = false;

1085

{

1086

char *interface = NULL;

1087

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

1088

mc->interfaces_size,

1089

interface))){

1090

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

1091

match = true;

1092

break;

1093

}

1094

}

1095

}

1096

if(not match){

1097

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

1098

connect to the server */

1099

if(debug){

1100

char interface[IF_NAMESIZE];

1101

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

1102

perror_plus("if_indextoname");

1103

} else {

1104

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

1105

" \"%s\"\n",

1106

if_indextoname((unsigned int)if_index,

1107

interface));

1108

}

1109

}

1110

return -1;

1111

}

1112

}

1113

1114

ret = init_gnutls_session(&session, mc);

578

1115

if(ret != 0){

579

1116

return -1;

580

1117

}

581

1118

582

1119

if(debug){

583

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

584

"\n", ip, port);

1120

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

1121

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

585

1122

}

586

1123

587

tcp_sd = socket(pf, SOCK_STREAM, 0);

1124

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

588

1125

if(tcp_sd < 0){

589

1126

int e = errno;

590

perror("socket");

1127

perror_plus("socket");

591

1128

errno = e;

592

1129

goto mandos_end;

593

1130

}

597

1134

goto mandos_end;

598

1135

}

599

1136

600

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

601

1137

if(af == AF_INET6){

602

to.in6.sin6_family = (sa_family_t)af;

603

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

1138

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

1139

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

1140

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

604

1141

} else { /* IPv4 */

605

to.in.sin_family = (sa_family_t)af;

606

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

1142

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

1143

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

1144

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

607

1145

}

608

1146

if(ret < 0 ){

609

1147

int e = errno;

610

perror("inet_pton");

1148

perror_plus("inet_pton");

611

1149

errno = e;

612

1150

goto mandos_end;

613

1151

}

614

1152

if(ret == 0){

615

1153

int e = errno;

616

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

1154

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

617

1155

errno = e;

618

1156

goto mandos_end;

619

1157

}

620

1158

if(af == AF_INET6){

621

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

622

-Wconversion and

623

-Wunreachable-code */

624

625

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

626

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

627

-Wunreachable-code*/

1159

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

1160

if(IN6_IS_ADDR_LINKLOCAL

1161

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

628

1162

if(if_index == AVAHI_IF_UNSPEC){

629

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

630

" without a network interface\n");

1163

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

1164

" incomplete without a network interface\n");

631

1165

errno = EINVAL;

632

1166

goto mandos_end;

633

1167

}

634

1168

/* Set the network interface number as scope */

635

to.in6.sin6_scope_id = (uint32_t)if_index;

1169

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

636

1170

}

637

1171

} else {

638

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

639

-Wconversion and

640

-Wunreachable-code */

1172

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

641

1173

}

642

1174

643

1175

if(quit_now){

649

1181

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

650

1182

char interface[IF_NAMESIZE];

651

1183

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

652

perror("if_indextoname");

1184

perror_plus("if_indextoname");

653

1185

} else {

654

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

655

ip, interface, port);

1186

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

1187

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

656

1188

}

657

1189

} else {

658

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

659

port);

1190

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

1191

ip, (uintmax_t)port);

660

1192

}

661

1193

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

662

1194

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

663

const char *pcret;

664

if(af == AF_INET6){

665

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

666

sizeof(addrstr));

667

} else {

668

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

669

sizeof(addrstr));

670

}

671

if(pcret == NULL){

672

perror("inet_ntop");

673

} else {

674

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

675

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

676

}

677

}

678

}

679

680

if(quit_now){

681

errno = EINTR;

682

goto mandos_end;

683

}

684

685

if(af == AF_INET6){

686

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

687

} else {

688

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

689

}

690

if(ret < 0){

691

int e = errno;

692

perror("connect");

693

errno = e;

694

goto mandos_end;

695

}

696

697

if(quit_now){

698

errno = EINTR;

699

goto mandos_end;

1195

if(af == AF_INET6){

1196

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

1197

sizeof(struct sockaddr_in6),

1198

addrstr, sizeof(addrstr), NULL, 0,

1199

NI_NUMERICHOST);

1200

} else {

1201

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

1202

sizeof(struct sockaddr_in),

1203

addrstr, sizeof(addrstr), NULL, 0,

1204

NI_NUMERICHOST);

1205

}

1206

if(ret == EAI_SYSTEM){

1207

perror_plus("getnameinfo");

1208

} else if(ret != 0) {

1209

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

1210

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

1211

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

1212

}

1213

}

1214

1215

if(quit_now){

1216

errno = EINTR;

1217

goto mandos_end;

1218

}

1219

1220

while(true){

1221

if(af == AF_INET6){

1222

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

1223

sizeof(struct sockaddr_in6));

1224

} else {

1225

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

1226

sizeof(struct sockaddr_in));

1227

}

1228

if(ret < 0){

1229

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

1230

and if_index != AVAHI_IF_UNSPEC

1231

and connect_to == NULL

1232

and not route_added and

1233

((af == AF_INET6 and not

1234

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1235

&to)->sin6_addr)))

1236

or (af == AF_INET and

1237

/* Not a a IPv4LL address */

1238

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

1239

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

1240

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

1241

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

1242

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

1243

connect to a Mandos server announced by Avahi on a server

1244

host with a global address. Work around this by retrying

1245

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

1246

1247

Avahi bug reference:

1248

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

1249

https://bugs.debian.org/587961

1250

*/

1251

if(debug){

1252

fprintf_plus(stderr, "Mandos server unreachable, trying"

1253

" direct route\n");

1254

}

1255

int e = errno;

1256

route_added = add_local_route(ip, if_index);

1257

if(route_added){

1258

continue;

1259

}

1260

errno = e;

1261

}

1262

if(errno != ECONNREFUSED or debug){

1263

int e = errno;

1264

perror_plus("connect");

1265

errno = e;

1266

}

1267

goto mandos_end;

1268

}

1269

1270

if(quit_now){

1271

errno = EINTR;

1272

goto mandos_end;

1273

}

1274

break;

700

1275

}

701

1276

702

1277

const char *out = mandos_protocol_version;

704

1279

while(true){

705

1280

size_t out_size = strlen(out);

706

1281

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

707

out_size - written));

1282

out_size - written));

708

1283

if(ret == -1){

709

1284

int e = errno;

710

perror("write");

1285

perror_plus("write");

711

1286

errno = e;

712

1287

goto mandos_end;

713

1288

}

730

1305

}

731

1306

732

1307

if(debug){

733

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

1308

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

734

1309

}

735

1310

736

1311

if(quit_now){

738

1313

goto mandos_end;

739

1314

}

740

1315

741

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1316

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

1317

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

1318

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

1319

gnutls_transport_set_ptr(session,

1320

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

742

1321

743

1322

if(quit_now){

744

1323

errno = EINTR;

755

1334

756

1335

if(ret != GNUTLS_E_SUCCESS){

757

1336

if(debug){

758

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

1337

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

759

1338

gnutls_perror(ret);

760

1339

}

761

1340

errno = EPROTO;

765

1344

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

766

1345

767

1346

if(debug){

768

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

769

ip);

1347

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1348

" %s\n", ip);

770

1349

}

771

1350

772

1351

while(true){

777

1356

}

778

1357

779

1358

buffer_capacity = incbuffer(&buffer, buffer_length,

780

buffer_capacity);

1359

buffer_capacity);

781

1360

if(buffer_capacity == 0){

782

1361

int e = errno;

783

perror("incbuffer");

1362

perror_plus("incbuffer");

784

1363

errno = e;

785

1364

goto mandos_end;

786

1365

}

810

1389

}

811

1390

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

812

1391

if(ret < 0){

813

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

1392

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

1393

"***\n");

814

1394

gnutls_perror(ret);

815

1395

errno = EPROTO;

816

1396

goto mandos_end;

817

1397

}

818

1398

break;

819

1399

default:

820

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

821

" encrypted session with Mandos server\n");

1400

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

1401

" encrypted session with Mandos server\n");

822

1402

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

1403

errno = EIO;

824

1404

goto mandos_end;

829

1409

}

830

1410

831

1411

if(debug){

832

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

1412

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

833

1413

}

834

1414

835

1415

if(quit_now){

847

1427

848

1428

if(buffer_length > 0){

849

1429

ssize_t decrypted_buffer_size;

850

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

buffer_length,

852

&decrypted_buffer);

1430

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1431

&decrypted_buffer, mc);

853

1432

if(decrypted_buffer_size >= 0){

854

1433

1434

clearerr(stdout);

855

1435

written = 0;

856

1436

while(written < (size_t) decrypted_buffer_size){

857

1437

if(quit_now){

865

1445

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

866

1446

int e = errno;

867

1447

if(debug){

868

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

869

strerror(errno));

1448

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

1449

strerror(errno));

870

1450

}

871

1451

errno = e;

872

1452

goto mandos_end;

873

1453

}

874

1454

written += (size_t)ret;

875

1455

}

1456

ret = fflush(stdout);

1457

if(ret != 0){

1458

int e = errno;

1459

if(debug){

1460

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

1461

strerror(errno));

1462

}

1463

errno = e;

1464

goto mandos_end;

1465

}

876

1466

retval = 0;

877

1467

}

878

1468

}

881

1471

882

1472

mandos_end:

883

1473

{

1474

if(route_added){

1475

if(not delete_local_route(ip, if_index)){

1476

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

1477

" interface %d", ip, if_index);

1478

}

1479

}

884

1480

int e = errno;

885

1481

free(decrypted_buffer);

886

1482

free(buffer);

887

1483

if(tcp_sd >= 0){

888

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

1484

ret = close(tcp_sd);

889

1485

}

890

1486

if(ret == -1){

891

1487

if(e == 0){

892

1488

e = errno;

893

1489

}

894

perror("close");

1490

perror_plus("close");

895

1491

}

896

1492

gnutls_deinit(session);

1493

errno = e;

897

1494

if(quit_now){

898

e = EINTR;

1495

errno = EINTR;

899

1496

retval = -1;

900

1497

}

901

errno = e;

902

1498

}

903

1499

return retval;

904

1500

}

916

1512

AVAHI_GCC_UNUSED AvahiStringList *txt,

917

1513

AVAHI_GCC_UNUSED AvahiLookupResultFlags

918

1514

flags,

919

AVAHI_GCC_UNUSED void* userdata){

920

assert(r);

1515

void *mc){

1516

if(r == NULL){

1517

return;

1518

}

921

1519

922

1520

/* Called whenever a service has been resolved successfully or

923

1521

timed out */

924

1522

925

1523

if(quit_now){

1524

avahi_s_service_resolver_free(r);

926

1525

return;

927

1526

}

928

1527

929

1528

switch(event){

930

1529

default:

931

1530

case AVAHI_RESOLVER_FAILURE:

932

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

933

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

934

avahi_strerror(avahi_server_errno(mc.server)));

1531

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

1532

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

1533

domain,

1534

avahi_strerror(avahi_server_errno

1535

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

935

1536

break;

936

1537

937

1538

case AVAHI_RESOLVER_FOUND:

939

1540

char ip[AVAHI_ADDRESS_STR_MAX];

940

1541

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

941

1542

if(debug){

942

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

943

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

944

ip, (intmax_t)interface, port);

1543

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

1544

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

1545

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

945

1546

}

946

int ret = start_mandos_communication(ip, port, interface,

947

avahi_proto_to_af(proto));

1547

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

1548

interface,

1549

avahi_proto_to_af(proto),

1550

mc);

948

1551

if(ret == 0){

949

avahi_simple_poll_quit(mc.simple_poll);

1552

avahi_simple_poll_quit(simple_poll);

1553

} else {

1554

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

1555

avahi_proto_to_af(proto),

1556

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

1557

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

1558

" list\n", name);

1559

}

950

1560

}

951

1561

}

952

1562

}

962

1572

const char *domain,

963

1573

AVAHI_GCC_UNUSED AvahiLookupResultFlags

964

1574

flags,

965

AVAHI_GCC_UNUSED void* userdata){

966

assert(b);

1575

void *mc){

1576

if(b == NULL){

1577

return;

1578

}

967

1579

968

1580

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

969

1581

is removed from the LAN */

976

1588

default:

977

1589

case AVAHI_BROWSER_FAILURE:

978

1590

979

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

980

avahi_strerror(avahi_server_errno(mc.server)));

981

avahi_simple_poll_quit(mc.simple_poll);

1591

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

1592

avahi_strerror(avahi_server_errno

1593

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

1594

avahi_simple_poll_quit(simple_poll);

982

1595

return;

983

1596

984

1597

case AVAHI_BROWSER_NEW:

987

1600

the callback function is called the Avahi server will free the

988

1601

resolver for us. */

989

1602

990

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

991

name, type, domain, protocol, 0,

992

resolve_callback, NULL) == NULL)

993

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

994

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

1603

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

1604

interface, protocol, name, type,

1605

domain, protocol, 0,

1606

resolve_callback, mc) == NULL)

1607

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

1608

" %s\n", name,

1609

avahi_strerror(avahi_server_errno

1610

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

995

1611

break;

996

1612

997

1613

case AVAHI_BROWSER_REMOVE:

1000

1616

case AVAHI_BROWSER_ALL_FOR_NOW:

1001

1617

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1002

1618

if(debug){

1003

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

1619

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

1620

" searching...\n");

1004

1621

}

1005

1622

break;

1006

1623

}

1007

1624

}

1008

1625

1009

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

1626

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

1010

1627

static void handle_sigterm(int sig){

1011

1628

if(quit_now){

1012

1629

return;

1014

1631

quit_now = 1;

1015

1632

signal_received = sig;

1016

1633

int old_errno = errno;

1017

if(mc.simple_poll != NULL){

1018

avahi_simple_poll_quit(mc.simple_poll);

1019

}

1020

errno = old_errno;

1634

/* set main loop to exit */

1635

if(simple_poll != NULL){

1636

avahi_simple_poll_quit(simple_poll);

1637

}

1638

errno = old_errno;

1639

}

1640

1641

__attribute__((nonnull, warn_unused_result))

1642

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

1643

int ret;

1644

int old_errno;

1645

1646

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

1647

if(s < 0){

1648

old_errno = errno;

1649

perror_plus("socket");

1650

errno = old_errno;

1651

return false;

1652

}

1653

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

1654

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

1655

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1656

if(ret == -1){

1657

if(debug){

1658

old_errno = errno;

1659

perror_plus("ioctl SIOCGIFFLAGS");

1660

errno = old_errno;

1661

}

1662

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

1663

old_errno = errno;

1664

perror_plus("close");

1665

errno = old_errno;

1666

}

1667

return false;

1668

}

1669

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

1670

old_errno = errno;

1671

perror_plus("close");

1672

errno = old_errno;

1673

}

1674

return true;

1675

}

1676

1677

__attribute__((nonnull, warn_unused_result))

1678

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

1679

1680

/* Reject the loopback device */

1681

if(ifr->ifr_flags & IFF_LOOPBACK){

1682

if(debug){

1683

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

1684

ifname);

1685

}

1686

return false;

1687

}

1688

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

1689

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

1690

if(debug){

1691

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

1692

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

1693

}

1694

return true;

1695

}

1696

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

1697

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

1698

if(debug){

1699

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1700

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

1701

}

1702

return false;

1703

}

1704

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

1705

if(ifr->ifr_flags & IFF_NOARP){

1706

if(debug){

1707

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

1708

ifname);

1709

}

1710

return false;

1711

}

1712

1713

/* Accept this device */

1714

if(debug){

1715

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

1716

}

1717

return true;

1718

}

1719

1720

/*

1721

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

1722

* corresponds to an acceptable network device.

1723

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

1724

*/

1725

__attribute__((nonnull, warn_unused_result))

1726

int good_interface(const struct dirent *if_entry){

1727

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

1728

return 0;

1729

}

1730

1731

struct ifreq ifr;

1732

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

1733

if(debug){

1734

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

1735

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

1736

}

1737

return 0;

1738

}

1739

1740

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

1741

return 0;

1742

}

1743

return 1;

1744

}

1745

1746

/*

1747

* This function determines if a network interface is up.

1748

*/

1749

__attribute__((nonnull, warn_unused_result))

1750

bool interface_is_up(const char *interface){

1751

struct ifreq ifr;

1752

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

1753

if(debug){

1754

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

1755

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

1756

}

1757

return false;

1758

}

1759

1760

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

1761

}

1762

1763

/*

1764

* This function determines if a network interface is running

1765

*/

1766

__attribute__((nonnull, warn_unused_result))

1767

bool interface_is_running(const char *interface){

1768

struct ifreq ifr;

1769

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

1770

if(debug){

1771

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

1772

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

1773

}

1774

return false;

1775

}

1776

1777

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

1778

}

1779

1780

__attribute__((nonnull, pure, warn_unused_result))

1781

int notdotentries(const struct dirent *direntry){

1782

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

1783

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

1784

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

1785

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

1786

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

1787

return 0;

1788

}

1789

return 1;

1790

}

1791

1792

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

1793

__attribute__((nonnull, warn_unused_result))

1794

int runnable_hook(const struct dirent *direntry){

1795

int ret;

1796

size_t sret;

1797

struct stat st;

1798

1799

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

1800

/* Empty name? */

1801

return 0;

1802

}

1803

1804

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

1805

"abcdefghijklmnopqrstuvwxyz"

1806

"0123456789"

1807

"_.-");

1808

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

1809

/* Contains non-allowed characters */

1810

if(debug){

1811

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

1812

direntry->d_name);

1813

}

1814

return 0;

1815

}

1816

1817

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

1818

if(ret == -1){

1819

if(debug){

1820

perror_plus("Could not stat hook");

1821

}

1822

return 0;

1823

}

1824

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

1825

/* Not a regular file */

1826

if(debug){

1827

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

1828

direntry->d_name);

1829

}

1830

return 0;

1831

}

1832

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

1833

/* Not executable */

1834

if(debug){

1835

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

1836

direntry->d_name);

1837

}

1838

return 0;

1839

}

1840

if(debug){

1841

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

1842

direntry->d_name);

1843

}

1844

return 1;

1845

}

1846

1847

__attribute__((nonnull, warn_unused_result))

1848

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1849

mandos_context *mc){

1850

int ret;

1851

struct timespec now;

1852

struct timespec waited_time;

1853

intmax_t block_time;

1854

1855

while(true){

1856

if(mc->current_server == NULL){

1857

if(debug){

1858

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

1859

" No timeout!\n");

1860

}

1861

ret = avahi_simple_poll_iterate(s, -1);

1862

} else {

1863

if(debug){

1864

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

1865

" it, or wait\n");

1866

}

1867

/* the current time */

1868

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1869

if(ret == -1){

1870

perror_plus("clock_gettime");

1871

return -1;

1872

}

1873

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

1874

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

1875

waited_time.tv_sec = (now.tv_sec

1876

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

1877

waited_time.tv_nsec = (now.tv_nsec

1878

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

1879

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

1880

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

1881

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

1882

block_time = ((retry_interval

1883

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

1884

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

1885

1886

if(debug){

1887

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

1888

block_time);

1889

}

1890

1891

if(block_time <= 0){

1892

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

1893

mc->current_server->port,

1894

mc->current_server->if_index,

1895

mc->current_server->af, mc);

1896

if(ret == 0){

1897

avahi_simple_poll_quit(s);

1898

return 0;

1899

}

1900

ret = clock_gettime(CLOCK_MONOTONIC,

1901

&mc->current_server->last_seen);

1902

if(ret == -1){

1903

perror_plus("clock_gettime");

1904

return -1;

1905

}

1906

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

1907

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

1908

servers, but don't block */

1909

}

1910

1911

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

1912

}

1913

if(ret != 0){

1914

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

1915

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

1916

}

1917

}

1918

}

1919

}

1920

1921

__attribute__((nonnull))

1922

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

1923

const float delay){

1924

struct dirent **direntries = NULL;

1925

if(hookdir_fd == -1){

1926

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1927

| O_CLOEXEC);

1928

if(hookdir_fd == -1){

1929

if(errno == ENOENT){

1930

if(debug){

1931

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

1932

" found\n", hookdir);

1933

}

1934

} else {

1935

perror_plus("open");

1936

}

1937

return;

1938

}

1939

}

1940

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

1941

if(devnull == -1){

1942

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

1943

return;

1944

}

1945

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

1946

runnable_hook, alphasort);

1947

if(numhooks == -1){

1948

perror_plus("scandir");

1949

close(devnull);

1950

return;

1951

}

1952

struct dirent *direntry;

1953

int ret;

1954

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

1955

direntry = direntries[i];

1956

if(debug){

1957

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

1958

direntry->d_name);

1959

}

1960

pid_t hook_pid = fork();

1961

if(hook_pid == 0){

1962

/* Child */

1963

/* Raise privileges */

1964

errno = raise_privileges_permanently();

1965

if(errno != 0){

1966

perror_plus("Failed to raise privileges");

1967

_exit(EX_NOPERM);

1968

}

1969

/* Set group */

1970

errno = 0;

1971

ret = setgid(0);

1972

if(ret == -1){

1973

perror_plus("setgid");

1974

_exit(EX_NOPERM);

1975

}

1976

/* Reset supplementary groups */

1977

errno = 0;

1978

ret = setgroups(0, NULL);

1979

if(ret == -1){

1980

perror_plus("setgroups");

1981

_exit(EX_NOPERM);

1982

}

1983

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

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

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

1989

if(ret == -1){

1990

perror_plus("setenv");

1991

_exit(EX_OSERR);

1992

}

1993

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

1994

if(ret == -1){

1995

perror_plus("setenv");

1996

_exit(EX_OSERR);

1997

}

1998

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

1999

if(ret == -1){

2000

perror_plus("setenv");

2001

_exit(EX_OSERR);

2002

}

2003

char *delaystring;

2004

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

2005

if(ret == -1){

2006

perror_plus("asprintf");

2007

_exit(EX_OSERR);

2008

}

2009

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

2010

if(ret == -1){

2011

free(delaystring);

2012

perror_plus("setenv");

2013

_exit(EX_OSERR);

2014

}

2015

free(delaystring);

2016

if(connect_to != NULL){

2017

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

2018

if(ret == -1){

2019

perror_plus("setenv");

2020

_exit(EX_OSERR);

2021

}

2022

}

2023

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

2024

direntry->d_name,

2025

O_RDONLY));

2026

if(hook_fd == -1){

2027

perror_plus("openat");

2028

_exit(EXIT_FAILURE);

2029

}

2030

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

2031

perror_plus("close");

2032

_exit(EXIT_FAILURE);

2033

}

2034

ret = dup2(devnull, STDIN_FILENO);

2035

if(ret == -1){

2036

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

2037

_exit(EX_OSERR);

2038

}

2039

ret = close(devnull);

2040

if(ret == -1){

2041

perror_plus("close");

2042

_exit(EX_OSERR);

2043

}

2044

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2045

if(ret == -1){

2046

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

2047

_exit(EX_OSERR);

2048

}

2049

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

2050

environ) == -1){

2051

perror_plus("fexecve");

2052

_exit(EXIT_FAILURE);

2053

}

2054

} else {

2055

if(hook_pid == -1){

2056

perror_plus("fork");

2057

free(direntry);

2058

continue;

2059

}

2060

int status;

2061

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

2062

perror_plus("waitpid");

2063

free(direntry);

2064

continue;

2065

}

2066

if(WIFEXITED(status)){

2067

if(WEXITSTATUS(status) != 0){

2068

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

2069

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

2070

WEXITSTATUS(status));

2071

free(direntry);

2072

continue;

2073

}

2074

} else if(WIFSIGNALED(status)){

2075

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

2076

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

2077

WTERMSIG(status));

2078

free(direntry);

2079

continue;

2080

} else {

2081

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

2082

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

2083

free(direntry);

2084

continue;

2085

}

2086

}

2087

if(debug){

2088

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

2089

direntry->d_name);

2090

}

2091

free(direntry);

2092

}

2093

free(direntries);

2094

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

2095

perror_plus("close");

2096

} else {

2097

hookdir_fd = -1;

2098

}

2099

close(devnull);

2100

}

2101

2102

__attribute__((nonnull, warn_unused_result))

2103

int bring_up_interface(const char *const interface,

2104

const float delay){

2105

int old_errno = errno;

2106

int ret;

2107

struct ifreq network;

2108

unsigned int if_index = if_nametoindex(interface);

2109

if(if_index == 0){

2110

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

2111

errno = old_errno;

2112

return ENXIO;

2113

}

2114

2115

if(quit_now){

2116

errno = old_errno;

2117

return EINTR;

2118

}

2119

2120

if(not interface_is_up(interface)){

2121

int ret_errno = 0;

2122

int ioctl_errno = 0;

2123

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

2124

ret_errno = errno;

2125

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

2126

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

2127

errno = old_errno;

2128

return ret_errno;

2129

}

2130

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

2131

2132

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

2133

if(sd == -1){

2134

ret_errno = errno;

2135

perror_plus("socket");

2136

errno = old_errno;

2137

return ret_errno;

2138

}

2139

2140

if(quit_now){

2141

ret = close(sd);

2142

if(ret == -1){

2143

perror_plus("close");

2144

}

2145

errno = old_errno;

2146

return EINTR;

2147

}

2148

2149

if(debug){

2150

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

2151

interface);

2152

}

2153

2154

/* Raise privileges */

2155

ret_errno = raise_privileges();

2156

if(ret_errno != 0){

2157

errno = ret_errno;

2158

perror_plus("Failed to raise privileges");

2159

}

2160

2161

#ifdef __linux__

2162

int ret_linux;

2163

bool restore_loglevel = false;

2164

if(ret_errno == 0){

2165

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2166

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

2167

ret_linux = klogctl(8, NULL, 5);

2168

if(ret_linux == -1){

2169

perror_plus("klogctl");

2170

} else {

2171

restore_loglevel = true;

2172

}

2173

}

2174

#endif /* __linux__ */

2175

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

2176

ioctl_errno = errno;

2177

#ifdef __linux__

2178

if(restore_loglevel){

2179

ret_linux = klogctl(7, NULL, 0);

2180

if(ret_linux == -1){

2181

perror_plus("klogctl");

2182

}

2183

}

2184

#endif /* __linux__ */

2185

2186

/* If raise_privileges() succeeded above */

2187

if(ret_errno == 0){

2188

/* Lower privileges */

2189

ret_errno = lower_privileges();

2190

if(ret_errno != 0){

2191

errno = ret_errno;

2192

perror_plus("Failed to lower privileges");

2193

}

2194

}

2195

2196

/* Close the socket */

2197

ret = close(sd);

2198

if(ret == -1){

2199

perror_plus("close");

2200

}

2201

2202

if(ret_setflags == -1){

2203

errno = ioctl_errno;

2204

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2205

errno = old_errno;

2206

return ioctl_errno;

2207

}

2208

} else if(debug){

2209

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

2210

interface);

2211

}

2212

2213

/* Sleep checking until interface is running.

2214

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

2215

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

2216

if(interface_is_running(interface)){

2217

break;

2218

}

2219

struct timespec sleeptime = { .tv_nsec = 250000000 };

2220

ret = nanosleep(&sleeptime, NULL);

2221

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

2222

perror_plus("nanosleep");

2223

}

2224

}

2225

2226

errno = old_errno;

2227

return 0;

2228

}

2229

2230

__attribute__((nonnull, warn_unused_result))

2231

int take_down_interface(const char *const interface){

2232

int old_errno = errno;

2233

struct ifreq network;

2234

unsigned int if_index = if_nametoindex(interface);

2235

if(if_index == 0){

2236

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

2237

errno = old_errno;

2238

return ENXIO;

2239

}

2240

if(interface_is_up(interface)){

2241

int ret_errno = 0;

2242

int ioctl_errno = 0;

2243

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

2244

ret_errno = errno;

2245

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

2246

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

2247

errno = old_errno;

2248

return ret_errno;

2249

}

2250

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

2251

2252

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

2253

if(sd == -1){

2254

ret_errno = errno;

2255

perror_plus("socket");

2256

errno = old_errno;

2257

return ret_errno;

2258

}

2259

2260

if(debug){

2261

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

2262

interface);

2263

}

2264

2265

/* Raise privileges */

2266

ret_errno = raise_privileges();

2267

if(ret_errno != 0){

2268

errno = ret_errno;

2269

perror_plus("Failed to raise privileges");

2270

}

2271

2272

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

2273

ioctl_errno = errno;

2274

2275

/* If raise_privileges() succeeded above */

2276

if(ret_errno == 0){

2277

/* Lower privileges */

2278

ret_errno = lower_privileges();

2279

if(ret_errno != 0){

2280

errno = ret_errno;

2281

perror_plus("Failed to lower privileges");

2282

}

2283

}

2284

2285

/* Close the socket */

2286

int ret = close(sd);

2287

if(ret == -1){

2288

perror_plus("close");

2289

}

2290

2291

if(ret_setflags == -1){

2292

errno = ioctl_errno;

2293

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2294

errno = old_errno;

2295

return ioctl_errno;

2296

}

2297

} else if(debug){

2298

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

2299

interface);

2300

}

2301

2302

errno = old_errno;

2303

return 0;

1021

2304

}

1022

2305

1023

2306

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

2307

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

2308

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

2309

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

2310

.current_server = NULL, .interfaces = NULL,

2311

.interfaces_size = 0 };

1024

2312

AvahiSServiceBrowser *sb = NULL;

1025

int error;

2313

error_t ret_errno;

1026

2314

int ret;

1027

2315

intmax_t tmpmax;

1028

2316

char *tmp;

1029

2317

int exitcode = EXIT_SUCCESS;

1030

const char *interface = "eth0";

1031

struct ifreq network;

1032

int sd = -1;

1033

bool take_down_interface = false;

1034

uid_t uid;

1035

gid_t gid;

1036

char *connect_to = NULL;

1037

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

1038

bool tempdir_created = false;

2318

char *interfaces_to_take_down = NULL;

2319

size_t interfaces_to_take_down_size = 0;

2320

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

2321

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

2322

char *tempdir = NULL;

1039

2323

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1040

2324

const char *seckey = PATHDIR "/" SECKEY;

1041

2325

const char *pubkey = PATHDIR "/" PUBKEY;

2326

const char *dh_params_file = NULL;

2327

char *interfaces_hooks = NULL;

1042

2328

1043

2329

bool gnutls_initialized = false;

1044

2330

bool gpgme_initialized = false;

1045

2331

float delay = 2.5f;

2332

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

2333

retrying the same server again */

1046

2334

1047

2335

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1048

2336

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1054

2342

errno = 0;

1055

2343

ret = setgid(gid);

1056

2344

if(ret == -1){

1057

perror("setgid");

2345

perror_plus("setgid");

1058

2346

}

1059

2347

1060

2348

/* Lower user privileges (temporarily) */

1061

2349

errno = 0;

1062

2350

ret = seteuid(uid);

1063

2351

if(ret == -1){

1064

perror("seteuid");

2352

perror_plus("seteuid");

1065

2353

}

1066

2354

1067

2355

if(quit_now){

1094

2382

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

1095

2383

" Diffie-Hellman key exchange",

1096

2384

.group = 2 },

2385

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

2386

.arg = "FILE",

2387

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

2388

" for the Diffie-Hellman key exchange",

2389

.group = 2 },

1097

2390

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

1098

2391

.arg = "STRING",

1099

2392

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

1102

2395

.arg = "SECONDS",

1103

2396

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

1104

2397

.group = 2 },

2398

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

2399

.arg = "SECONDS",

2400

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

2401

.group = 2 },

2402

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

2403

.arg = "DIR",

2404

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

2405

.group = 2 },

1105

2406

/*

1106

2407

* These reproduce what we would get without ARGP_NO_HELP

1107

2408

*/

1125

2426

connect_to = arg;

1126

2427

break;

1127

2428

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

1128

interface = arg;

2429

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

2430

arg, (int)',');

2431

if(ret_errno != 0){

2432

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

2433

}

1129

2434

break;

1130

2435

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

1131

2436

seckey = arg;

1142

2447

}

1143

2448

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

1144

2449

break;

2450

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

2451

dh_params_file = arg;

2452

break;

1145

2453

case 130: /* --priority */

1146

2454

mc.priority = arg;

1147

2455

break;

1151

2459

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

1152

2460

argp_error(state, "Bad delay");

1153

2461

}

2462

case 132: /* --retry */

2463

errno = 0;

2464

retry_interval = strtod(arg, &tmp);

2465

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

2466

or (retry_interval * 1000) > INT_MAX

2467

or retry_interval < 0){

2468

argp_error(state, "Bad retry interval");

2469

}

2470

break;

2471

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

2472

hookdir = arg;

1154

2473

break;

1155

2474

/*

1156

2475

* These reproduce what we would get without ARGP_NO_HELP

1163

2482

argp_state_help(state, state->out_stream,

1164

2483

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

2484

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

1166

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

2485

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

1167

2486

exit(argp_err_exit_status);

1168

2487

break;

1169

2488

default:

1176

2495

.args_doc = "",

1177

2496

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

1178

2497

" passwords from a Mandos server" };

1179

ret = argp_parse(&argp, argc, argv,

1180

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1181

switch(ret){

2498

ret_errno = argp_parse(&argp, argc, argv,

2499

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2500

switch(ret_errno){

1182

2501

case 0:

1183

2502

break;

1184

2503

case ENOMEM:

1185

2504

default:

1186

errno = ret;

1187

perror("argp_parse");

2505

errno = ret_errno;

2506

perror_plus("argp_parse");

1188

2507

exitcode = EX_OSERR;

1189

2508

goto end;

1190

2509

case EINVAL:

1193

2512

}

1194

2513

}

1195

2514

2515

{

2516

/* Work around Debian bug #633582:

2517

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

2518

2519

/* Re-raise privileges */

2520

ret = raise_privileges();

2521

if(ret != 0){

2522

errno = ret;

2523

perror_plus("Failed to raise privileges");

2524

} else {

2525

struct stat st;

2526

2527

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

2528

int seckey_fd = open(seckey, O_RDONLY);

2529

if(seckey_fd == -1){

2530

perror_plus("open");

2531

} else {

2532

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

2533

if(ret == -1){

2534

perror_plus("fstat");

2535

} else {

2536

if(S_ISREG(st.st_mode)

2537

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

2538

ret = fchown(seckey_fd, uid, gid);

2539

if(ret == -1){

2540

perror_plus("fchown");

2541

}

2542

}

2543

}

2544

close(seckey_fd);

2545

}

2546

}

2547

2548

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

2549

int pubkey_fd = open(pubkey, O_RDONLY);

2550

if(pubkey_fd == -1){

2551

perror_plus("open");

2552

} else {

2553

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

2554

if(ret == -1){

2555

perror_plus("fstat");

2556

} else {

2557

if(S_ISREG(st.st_mode)

2558

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

2559

ret = fchown(pubkey_fd, uid, gid);

2560

if(ret == -1){

2561

perror_plus("fchown");

2562

}

2563

}

2564

}

2565

close(pubkey_fd);

2566

}

2567

}

2568

2569

if(dh_params_file != NULL

2570

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

2571

int dhparams_fd = open(dh_params_file, O_RDONLY);

2572

if(dhparams_fd == -1){

2573

perror_plus("open");

2574

} else {

2575

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

2576

if(ret == -1){

2577

perror_plus("fstat");

2578

} else {

2579

if(S_ISREG(st.st_mode)

2580

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

2581

ret = fchown(dhparams_fd, uid, gid);

2582

if(ret == -1){

2583

perror_plus("fchown");

2584

}

2585

}

2586

}

2587

close(dhparams_fd);

2588

}

2589

}

2590

2591

/* Lower privileges */

2592

ret = lower_privileges();

2593

if(ret != 0){

2594

errno = ret;

2595

perror_plus("Failed to lower privileges");

2596

}

2597

}

2598

}

2599

2600

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

2601

{

2602

char *interface = NULL;

2603

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

2604

interface))){

2605

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

2606

and if_nametoindex(interface) == 0){

2607

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

2608

fprintf_plus(stderr, "Not using nonexisting interface"

2609

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

2610

}

2611

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

2612

interface = NULL;

2613

}

2614

}

2615

}

2616

2617

/* Run network hooks */

2618

{

2619

if(mc.interfaces != NULL){

2620

interfaces_hooks = malloc(mc.interfaces_size);

2621

if(interfaces_hooks == NULL){

2622

perror_plus("malloc");

2623

goto end;

2624

}

2625

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

2626

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

2627

}

2628

run_network_hooks("start", interfaces_hooks != NULL ?

2629

interfaces_hooks : "", delay);

2630

}

2631

1196

2632

if(not debug){

1197

2633

avahi_set_log_function(empty_log);

1198

2634

}

1201

2637

from the signal handler */

1202

2638

/* Initialize the pseudo-RNG for Avahi */

1203

2639

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

1204

mc.simple_poll = avahi_simple_poll_new();

1205

if(mc.simple_poll == NULL){

1206

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

2640

simple_poll = avahi_simple_poll_new();

2641

if(simple_poll == NULL){

2642

fprintf_plus(stderr,

2643

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

1207

2644

exitcode = EX_UNAVAILABLE;

1208

2645

goto end;

1209

2646

}

1211

2648

sigemptyset(&sigterm_action.sa_mask);

1212

2649

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

1213

2650

if(ret == -1){

1214

perror("sigaddset");

2651

perror_plus("sigaddset");

1215

2652

exitcode = EX_OSERR;

1216

2653

goto end;

1217

2654

}

1218

2655

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

1219

2656

if(ret == -1){

1220

perror("sigaddset");

2657

perror_plus("sigaddset");

1221

2658

exitcode = EX_OSERR;

1222

2659

goto end;

1223

2660

}

1224

2661

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

1225

2662

if(ret == -1){

1226

perror("sigaddset");

2663

perror_plus("sigaddset");

1227

2664

exitcode = EX_OSERR;

1228

2665

goto end;

1229

2666

}

1233

2670

*/

1234

2671

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

1235

2672

if(ret == -1){

1236

perror("sigaction");

2673

perror_plus("sigaction");

1237

2674

return EX_OSERR;

1238

2675

}

1239

2676

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

2677

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

1241

2678

if(ret == -1){

1242

perror("sigaction");

2679

perror_plus("sigaction");

1243

2680

exitcode = EX_OSERR;

1244

2681

goto end;

1245

2682

}

1246

2683

}

1247

2684

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

1248

2685

if(ret == -1){

1249

perror("sigaction");

2686

perror_plus("sigaction");

1250

2687

return EX_OSERR;

1251

2688

}

1252

2689

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

2690

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

1254

2691

if(ret == -1){

1255

perror("sigaction");

2692

perror_plus("sigaction");

1256

2693

exitcode = EX_OSERR;

1257

2694

goto end;

1258

2695

}

1259

2696

}

1260

2697

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

1261

2698

if(ret == -1){

1262

perror("sigaction");

2699

perror_plus("sigaction");

1263

2700

return EX_OSERR;

1264

2701

}

1265

2702

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

2703

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

1267

2704

if(ret == -1){

1268

perror("sigaction");

1269

exitcode = EX_OSERR;

1270

goto end;

1271

}

1272

}

1273

1274

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

1275

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

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

if(if_index == 0){

1278

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

1279

exitcode = EX_UNAVAILABLE;

1280

goto end;

1281

}

1282

1283

if(quit_now){

1284

goto end;

1285

}

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1294

#ifdef __linux__

1295

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1297

ret = klogctl(8, NULL, 5);

1298

bool restore_loglevel = true;

1299

if(ret == -1){

1300

restore_loglevel = false;

1301

perror("klogctl");

1302

}

1303

#endif /* __linux__ */

1304

1305

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

if(sd < 0){

1307

perror("socket");

1308

exitcode = EX_OSERR;

1309

#ifdef __linux__

1310

if(restore_loglevel){

1311

ret = klogctl(7, NULL, 0);

1312

if(ret == -1){

1313

perror("klogctl");

1314

}

1315

}

1316

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

goto end;

1324

}

1325

strcpy(network.ifr_name, interface);

1326

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

1327

if(ret == -1){

1328

perror("ioctl SIOCGIFFLAGS");

1329

#ifdef __linux__

1330

if(restore_loglevel){

1331

ret = klogctl(7, NULL, 0);

1332

if(ret == -1){

1333

perror("klogctl");

1334

}

1335

}

1336

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1344

goto end;

1345

}

1346

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

1347

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1349

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

1350

if(ret == -1){

1351

take_down_interface = false;

1352

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1354

#ifdef __linux__

1355

if(restore_loglevel){

1356

ret = klogctl(7, NULL, 0);

1357

if(ret == -1){

1358

perror("klogctl");

2705

perror_plus("sigaction");

2706

exitcode = EX_OSERR;

2707

goto end;

2708

}

2709

}

2710

2711

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

2712

if(mc.interfaces == NULL){

2713

struct dirent **direntries = NULL;

2714

/* Look for any good interfaces */

2715

ret = scandir(sys_class_net, &direntries, good_interface,

2716

alphasort);

2717

if(ret >= 1){

2718

/* Add all found interfaces to interfaces list */

2719

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

2720

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

2721

direntries[i]->d_name);

2722

if(ret_errno != 0){

2723

errno = ret_errno;

2724

perror_plus("argz_add");

2725

free(direntries[i]);

2726

continue;

2727

}

2728

if(debug){

2729

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

2730

direntries[i]->d_name);

2731

}

2732

free(direntries[i]);

2733

}

2734

free(direntries);

2735

} else {

2736

if(ret == 0){

2737

free(direntries);

2738

}

2739

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

2740

exitcode = EXIT_FAILURE;

2741

goto end;

2742

}

2743

}

2744

2745

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

2746

{

2747

char *interface = NULL;

2748

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

2749

interface))){

2750

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

2751

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

2752

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

2753

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

2754

interface);

2755

interface = NULL;

2756

while((interface = argz_next(mc.interfaces,

2757

mc.interfaces_size, interface))){

2758

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

2759

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

2760

interface);

2761

interface = NULL;

1359

2762

}

1360

2763

}

1361

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

goto end;

1369

}

1370

}

1371

/* sleep checking until interface is running */

1372

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

1373

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

1374

if(ret == -1){

1375

perror("ioctl SIOCGIFFLAGS");

1376

} else if(network.ifr_flags & IFF_RUNNING){

1377

2764

break;

1378

2765

}

1379

struct timespec sleeptime = { .tv_nsec = 250000000 };

1380

ret = nanosleep(&sleeptime, NULL);

1381

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

1382

perror("nanosleep");

1383

}

1384

}

1385

if(not take_down_interface){

1386

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

1387

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

1388

if(ret == -1){

1389

perror("close");

1390

}

1391

}

1392

#ifdef __linux__

1393

if(restore_loglevel){

1394

/* Restores kernel loglevel to default */

1395

ret = klogctl(7, NULL, 0);

1396

if(ret == -1){

1397

perror("klogctl");

1398

}

1399

}

1400

#endif /* __linux__ */

1401

/* Lower privileges */

1402

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

1409

} else {

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

2766

bool interface_was_up = interface_is_up(interface);

2767

errno = bring_up_interface(interface, delay);

2768

if(not interface_was_up){

2769

if(errno != 0){

2770

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

2771

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

2772

} else {

2773

errno = argz_add(&interfaces_to_take_down,

2774

&interfaces_to_take_down_size,

2775

interface);

2776

if(errno != 0){

2777

perror_plus("argz_add");

2778

}

2779

}

2780

}

2781

}

2782

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

2783

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

2784

}

2785

}

2786

2787

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

2788

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

2789

if(debug){

2790

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

2791

mc.interfaces);

2792

}

2793

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

1416

2794

}

1417

2795

1418

2796

if(quit_now){

1419

2797

goto end;

1420

2798

}

1421

2799

1422

ret = init_gnutls_global(pubkey, seckey);

2800

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

1423

2801

if(ret == -1){

1424

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

2802

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

1425

2803

exitcode = EX_UNAVAILABLE;

1426

2804

goto end;

1427

2805

} else {

1432

2810

goto end;

1433

2811

}

1434

2812

1435

tempdir_created = true;

1436

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

perror("mkdtemp");

2813

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

2814

tempdir = mkdtemp(run_tempdir);

2815

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

2816

if(debug){

2817

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

2818

run_tempdir, old_tempdir);

2819

}

2820

tempdir = mkdtemp(old_tempdir);

2821

}

2822

if(tempdir == NULL){

2823

perror_plus("mkdtemp");

1439

2824

goto end;

1440

2825

}

1441

2826

1443

2828

goto end;

1444

2829

}

1445

2830

1446

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

1447

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

2831

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

2832

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

1448

2833

exitcode = EX_UNAVAILABLE;

1449

2834

goto end;

1450

2835

} else {

1459

2844

/* Connect directly, do not use Zeroconf */

1460

2845

/* (Mainly meant for debugging) */

1461

2846

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

2847

1462

2848

if(address == NULL){

1463

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

2849

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

1464

2850

exitcode = EX_USAGE;

1465

2851

goto end;

1466

2852

}

1469

2855

goto end;

1470

2856

}

1471

2857

1472

uint16_t port;

2858

in_port_t port;

1473

2859

errno = 0;

1474

2860

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

1475

2861

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

1476

or tmpmax != (uint16_t)tmpmax){

1477

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

2862

or tmpmax != (in_port_t)tmpmax){

2863

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

1478

2864

exitcode = EX_USAGE;

1479

2865

goto end;

1480

2866

}

1481

2867

1482

2868

if(quit_now){

1483

2869

goto end;

1484

2870

}

1485

2871

1486

port = (uint16_t)tmpmax;

2872

port = (in_port_t)tmpmax;

1487

2873

*address = '\0';

1488

address = connect_to;

1489

2874

/* Colon in address indicates IPv6 */

1490

2875

int af;

1491

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

2876

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

1492

2877

af = AF_INET6;

2878

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

2879

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

2880

{

2881

connect_to++;

2882

address[-1] = '\0';

2883

}

1493

2884

} else {

1494

2885

af = AF_INET;

1495

2886

}

2887

address = connect_to;

1496

2888

1497

2889

if(quit_now){

1498

2890

goto end;

1499

2891

}

1500

2892

1501

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

1502

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1522

} else {

2893

while(not quit_now){

2894

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

2895

&mc);

2896

if(quit_now or ret == 0){

2897

break;

2898

}

2899

if(debug){

2900

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

2901

(int)retry_interval);

2902

}

2903

sleep((unsigned int)retry_interval);

2904

}

2905

2906

if(not quit_now){

1523

2907

exitcode = EXIT_SUCCESS;

1524

2908

}

2909

1525

2910

goto end;

1526

2911

}

1527

2912

1539

2924

config.publish_domain = 0;

1540

2925

1541

2926

/* Allocate a new server */

1542

mc.server = avahi_server_new(avahi_simple_poll_get

1543

(mc.simple_poll), &config, NULL,

1544

NULL, &error);

2927

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2928

&config, NULL, NULL, &ret);

1545

2929

1546

2930

/* Free the Avahi configuration data */

1547

2931

avahi_server_config_free(&config);

1549

2933

1550

2934

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

1551

2935

if(mc.server == NULL){

1552

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

1553

avahi_strerror(error));

2936

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

2937

avahi_strerror(ret));

1554

2938

exitcode = EX_UNAVAILABLE;

1555

2939

goto end;

1556

2940

}

1562

2946

/* Create the Avahi service browser */

1563

2947

sb = avahi_s_service_browser_new(mc.server, if_index,

1564

2948

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1565

NULL, 0, browse_callback, NULL);

2949

NULL, 0, browse_callback,

2950

(void *)&mc);

1566

2951

if(sb == NULL){

1567

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

1568

avahi_strerror(avahi_server_errno(mc.server)));

2952

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

2953

avahi_strerror(avahi_server_errno(mc.server)));

1569

2954

exitcode = EX_UNAVAILABLE;

1570

2955

goto end;

1571

2956

}

1577

2962

/* Run the main loop */

1578

2963

1579

2964

if(debug){

1580

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

2965

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

1581

2966

}

1582

2967

1583

avahi_simple_poll_loop(mc.simple_poll);

2968

ret = avahi_loop_with_timeout(simple_poll,

2969

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

2970

if(debug){

2971

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

2972

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

2973

}

1584

2974

1585

2975

end:

1586

2976

1587

2977

if(debug){

1588

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

2978

if(signal_received){

2979

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

2980

argv[0], signal_received,

2981

strsignal(signal_received));

2982

} else {

2983

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

2984

}

1589

2985

}

1590

2986

1591

2987

/* Cleanup things */

2988

free(mc.interfaces);

2989

1592

2990

if(sb != NULL)

1593

2991

avahi_s_service_browser_free(sb);

1594

2992

1595

2993

if(mc.server != NULL)

1596

2994

avahi_server_free(mc.server);

1597

2995

1598

if(mc.simple_poll != NULL)

1599

avahi_simple_poll_free(mc.simple_poll);

2996

if(simple_poll != NULL)

2997

avahi_simple_poll_free(simple_poll);

1600

2998

1601

2999

if(gnutls_initialized){

1602

3000

gnutls_certificate_free_credentials(mc.cred);

1603

gnutls_global_deinit();

1604

3001

gnutls_dh_params_deinit(mc.dh_params);

1605

3002

}

1606

3003

1608

3005

gpgme_release(mc.ctx);

1609

3006

}

1610

3007

1611

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1616

if(ret == -1){

1617

perror("seteuid");

1618

}

1619

if(geteuid() == 0){

1620

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

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

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

1625

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

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

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

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

1640

}

1641

}

1642

1643

/* Removes the temp directory used by GPGME */

1644

if(tempdir_created){

1645

DIR *d;

1646

struct dirent *direntry;

1647

d = opendir(tempdir);

1648

if(d == NULL){

1649

if(errno != ENOENT){

1650

perror("opendir");

1651

}

1652

} else {

1653

while(true){

1654

direntry = readdir(d);

1655

if(direntry == NULL){

1656

break;

1657

}

1658

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

1659

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

1660

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

1661

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

1662

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

1663

continue;

1664

}

1665

char *fullname = NULL;

1666

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

1667

direntry->d_name);

1668

if(ret < 0){

1669

perror("asprintf");

1670

continue;

1671

}

1672

ret = remove(fullname);

1673

if(ret == -1){

1674

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

1675

strerror(errno));

1676

}

1677

free(fullname);

1678

}

1679

closedir(d);

1680

}

1681

ret = rmdir(tempdir);

1682

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

1683

perror("rmdir");

1684

}

3008

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

3009

has seen */

3010

if(mc.current_server != NULL){

3011

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

3012

while(mc.current_server != NULL){

3013

server *next = mc.current_server->next;

3014

#ifdef __GNUC__

3015

#pragma GCC diagnostic push

3016

#pragma GCC diagnostic ignored "-Wcast-qual"

3017

#endif

3018

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

3019

#ifdef __GNUC__

3020

#pragma GCC diagnostic pop

3021

#endif

3022

free(mc.current_server);

3023

mc.current_server = next;

3024

}

3025

}

3026

3027

/* Re-raise privileges */

3028

{

3029

ret = raise_privileges();

3030

if(ret != 0){

3031

errno = ret;

3032

perror_plus("Failed to raise privileges");

3033

} else {

3034

3035

/* Run network hooks */

3036

run_network_hooks("stop", interfaces_hooks != NULL ?

3037

interfaces_hooks : "", delay);

3038

3039

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

3040

{

3041

char *interface = NULL;

3042

while((interface = argz_next(interfaces_to_take_down,

3043

interfaces_to_take_down_size,

3044

interface))){

3045

ret = take_down_interface(interface);

3046

if(ret != 0){

3047

errno = ret;

3048

perror_plus("Failed to take down interface");

3049

}

3050

}

3051

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

3052

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

3053

" down\n");

3054

}

3055

}

3056

}

3057

3058

ret = lower_privileges_permanently();

3059

if(ret != 0){

3060

errno = ret;

3061

perror_plus("Failed to lower privileges permanently");

3062

}

3063

}

3064

3065

free(interfaces_to_take_down);

3066

free(interfaces_hooks);

3067

3068

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

3069

uintmax_t level){

3070

struct dirent **direntries = NULL;

3071

int dret;

3072

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

3073

O_RDONLY

3074

| O_NOFOLLOW

3075

| O_DIRECTORY

3076

| O_PATH));

3077

if(dir_fd == -1){

3078

perror_plus("open");

3079

return;

3080

}

3081

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

3082

notdotentries, alphasort);

3083

if(numentries >= 0){

3084

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

3085

if(debug){

3086

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

3087

dirname, direntries[i]->d_name);

3088

}

3089

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

3090

if(dret == -1){

3091

if(errno == EISDIR){

3092

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

3093

AT_REMOVEDIR);

3094

}

3095

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

3096

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

3097

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

3098

/* Recurse only in this special case */

3099

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

3100

dret = 0;

3101

}

3102

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

3103

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

3104

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

3105

}

3106

}

3107

free(direntries[i]);

3108

}

3109

3110

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

3111

free(direntries);

3112

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3113

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

3114

perror_plus("rmdir");

3115

}

3116

} else {

3117

perror_plus("scandirat");

3118

}

3119

close(dir_fd);

3120

}

3121

3122

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

3123

if(tempdir != NULL){

3124

clean_dir_at(-1, tempdir, 0);

1685

3125

}

1686

3126

1687

3127

if(quit_now){

1691

3131

&old_sigterm_action,

1692

3132

NULL));

1693

3133

if(ret == -1){

1694

perror("sigaction");

3134

perror_plus("sigaction");

1695

3135

}

1696

3136

do {

1697

3137

ret = raise(signal_received);

1698

3138

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

1699

3139

if(ret != 0){

1700

perror("raise");

3140

perror_plus("raise");

1701

3141

abort();

1702

3142

}

1703

3143

TEMP_FAILURE_RETRY(pause());