/mandos/trunk : revision 24.1.172

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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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* along with this program. If not, see

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

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*

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

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* Contact the authors at <mandos@fukt.bsnet.se>.

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*/

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

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif /* not _LARGEFILE_SOURCE */

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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

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

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stdout, ferror() */

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

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stdout, ferror(), remove() */

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#include <stdint.h> /* uint16_t, uint32_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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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(), S_ISREG */

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

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

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inet_pton(), connect(),

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getnameinfo() */

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

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inet_pton(), connect() */

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

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

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*/

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

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strtoimax() */

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

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program_invocation_short_name */

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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(), sleep() */

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

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SIOCSIFFLAGS, if_indextoname(),

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*/

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

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

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

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unlinkat() */

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

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setgid(), pause() */

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

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

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

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argp_state, struct argp,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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init_gnutls_session(),

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GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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122

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

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123

#define SECKEY "seckey.txt"

135

124

#define PUBKEY "pubkey.txt"

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

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bool debug = false;

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127

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@recompile.se>";

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const char *argp_program_bug_address = "<mandos@fukt.bsnet.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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149

/* 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 */

161

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typedef struct {

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AvahiSimplePoll *simple_poll;

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136

AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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gnutls_dh_params_t dh_params;

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const char *priority;

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141

gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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142

} mandos_context;

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143

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/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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":!CTYPE-X.509:+CTYPE-OPENPGP" };

175

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176

149

sig_atomic_t quit_now = 0;

177

150

int signal_received = 0;

178

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179

/* Function to use when printing errors */

180

void perror_plus(const char *print_text){

181

int e = errno;

182

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

183

program_invocation_short_name);

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errno = e;

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perror(print_text);

186

}

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188

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

189

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

190

va_list ap;

191

va_start (ap, format);

192

193

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

194

program_invocation_short_name));

195

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

196

}

197

198

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/*

199

153

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

200

154

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

201

155

* "buffer_length" is how much is already used.

202

156

*/

203

__attribute__((nonnull, warn_unused_result))

204

157

size_t incbuffer(char **buffer, size_t buffer_length,

205

size_t buffer_capacity){

158

size_t buffer_capacity){

206

159

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

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free(*buffer);

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errno = old_errno;

212

*buffer = NULL;

160

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

161

if(buffer == NULL){

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162

return 0;

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163

}

215

*buffer = new_buf;

216

164

buffer_capacity += BUFFER_SIZE;

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165

}

218

166

return buffer_capacity;

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167

}

220

168

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

222

__attribute__((nonnull, warn_unused_result))

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

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int af, server **current_server){

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int ret;

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

227

if(new_server == NULL){

228

perror_plus("malloc");

229

return false;

230

}

231

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

232

.port = port,

233

.if_index = if_index,

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.af = af };

235

if(new_server->ip == NULL){

236

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

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

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

return false;

253

}

254

/* Special case of first server */

255

if(*current_server == NULL){

256

new_server->next = new_server;

257

new_server->prev = new_server;

258

*current_server = new_server;

259

} else {

260

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

261

new_server->next = *current_server;

262

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

263

new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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}

266

return true;

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}

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269

169

/*

270

170

* Initialize GPGME.

271

171

*/

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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177

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/*

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

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180

*/

283

bool import_key(const char * const filename){

181

bool import_key(const char *filename){

284

182

int ret;

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int fd;

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gpgme_data_t pgp_data;

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185

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

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187

if(fd == -1){

290

perror_plus("open");

188

perror("open");

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189

return false;

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190

}

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191

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

295

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

299

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}

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

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rc = gpgme_op_import(mc.ctx, pgp_data);

302

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if(rc != GPG_ERR_NO_ERROR){

303

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

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gpgme_strsource(rc), gpgme_strerror(rc));

201

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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203

return false;

306

204

}

307

205

308

206

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

309

207

if(ret == -1){

310

perror_plus("close");

208

perror("close");

311

209

}

312

210

gpgme_data_release(pgp_data);

313

211

return true;

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212

}

315

213

316

214

if(debug){

317

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

215

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

318

216

}

319

217

320

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/* Init GPGME */

321

219

gpgme_check_version(NULL);

322

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

323

221

if(rc != GPG_ERR_NO_ERROR){

324

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

325

gpgme_strsource(rc), gpgme_strerror(rc));

222

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

223

gpgme_strsource(rc), gpgme_strerror(rc));

326

224

return false;

327

225

}

328

226

329

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

227

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

330

228

rc = gpgme_get_engine_info(&engine_info);

331

229

if(rc != GPG_ERR_NO_ERROR){

332

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

333

gpgme_strsource(rc), gpgme_strerror(rc));

230

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

231

gpgme_strsource(rc), gpgme_strerror(rc));

334

232

return false;

335

233

}

336

234

while(engine_info != NULL){

342

240

engine_info = engine_info->next;

343

241

}

344

242

if(engine_info == NULL){

345

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

346

tempdir);

243

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

347

244

return false;

348

245

}

349

246

350

247

/* Create new GPGME "context" */

351

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

248

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

352

249

if(rc != GPG_ERR_NO_ERROR){

353

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

354

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

355

gpgme_strerror(rc));

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

356

252

return false;

357

253

}

358

254

367

263

* Decrypt OpenPGP data.

368

264

* Returns -1 on error

369

265

*/

370

__attribute__((nonnull, warn_unused_result))

371

266

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

267

size_t crypto_size,

373

char **plaintext,

374

mandos_context *mc){

268

char **plaintext){

375

269

gpgme_data_t dh_crypto, dh_plain;

376

270

gpgme_error_t rc;

377

271

ssize_t ret;

379

273

ssize_t plaintext_length = 0;

380

274

381

275

if(debug){

382

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

276

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

383

277

}

384

278

385

279

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

386

280

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

387

281

0);

388

282

if(rc != GPG_ERR_NO_ERROR){

389

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

390

gpgme_strsource(rc), gpgme_strerror(rc));

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

391

285

return -1;

392

286

}

393

287

394

288

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

395

289

rc = gpgme_data_new(&dh_plain);

396

290

if(rc != GPG_ERR_NO_ERROR){

397

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

398

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

400

293

gpgme_data_release(dh_crypto);

401

294

return -1;

402

295

}

403

296

404

297

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

405

298

data buffer */

406

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

299

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

407

300

if(rc != GPG_ERR_NO_ERROR){

408

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

409

gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

410

303

plaintext_length = -1;

411

304

if(debug){

412

305

gpgme_decrypt_result_t result;

413

result = gpgme_op_decrypt_result(mc->ctx);

306

result = gpgme_op_decrypt_result(mc.ctx);

414

307

if(result == NULL){

415

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

308

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

416

309

} else {

417

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

418

result->unsupported_algorithm);

419

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

420

result->wrong_key_usage);

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

421

314

if(result->file_name != NULL){

422

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

315

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

423

316

}

424

317

gpgme_recipient_t recipient;

425

318

recipient = result->recipients;

426

319

while(recipient != NULL){

427

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

428

gpgme_pubkey_algo_name

429

(recipient->pubkey_algo));

430

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

431

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

432

recipient->status == GPG_ERR_NO_SECKEY

433

? "No" : "Yes");

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

434

326

recipient = recipient->next;

435

327

}

436

328

}

439

331

}

440

332

441

333

if(debug){

442

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

334

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

443

335

}

444

336

445

337

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

446

338

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

447

perror_plus("gpgme_data_seek");

339

perror("gpgme_data_seek");

448

340

plaintext_length = -1;

449

341

goto decrypt_end;

450

342

}

452

344

*plaintext = NULL;

453

345

while(true){

454

346

plaintext_capacity = incbuffer(plaintext,

455

(size_t)plaintext_length,

456

plaintext_capacity);

347

(size_t)plaintext_length,

348

plaintext_capacity);

457

349

if(plaintext_capacity == 0){

458

perror_plus("incbuffer");

459

plaintext_length = -1;

460

goto decrypt_end;

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

461

353

}

462

354

463

355

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

468

360

break;

469

361

}

470

362

if(ret < 0){

471

perror_plus("gpgme_data_read");

363

perror("gpgme_data_read");

472

364

plaintext_length = -1;

473

365

goto decrypt_end;

474

366

}

476

368

}

477

369

478

370

if(debug){

479

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

371

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

480

372

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

481

373

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

482

374

}

493

385

return plaintext_length;

494

386

}

495

387

496

__attribute__((warn_unused_result, const))

497

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

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

503

__attribute__((warn_unused_result))

504

static const char *safer_gnutls_strerror(int value){

505

const char *ret = gnutls_strerror(value);

506

return safe_string(ret);

388

static const char * safer_gnutls_strerror(int value){

389

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

390

-Wunreachable-code */

391

if(ret == NULL)

392

ret = "(unknown)";

393

return ret;

507

394

}

508

395

509

396

/* GnuTLS log function callback */

510

__attribute__((nonnull))

511

397

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

512

398

const char* string){

513

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

399

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

514

400

}

515

401

516

__attribute__((nonnull, warn_unused_result))

517

402

static int init_gnutls_global(const char *pubkeyfilename,

518

const char *seckeyfilename,

519

const char *dhparamsfilename,

520

mandos_context *mc){

403

const char *seckeyfilename){

521

404

int ret;

522

unsigned int uret;

523

405

524

406

if(debug){

525

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

407

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

526

408

}

527

409

528

410

ret = gnutls_global_init();

529

411

if(ret != GNUTLS_E_SUCCESS){

530

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

531

safer_gnutls_strerror(ret));

412

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

413

safer_gnutls_strerror(ret));

532

414

return -1;

533

415

}

534

416

541

423

}

542

424

543

425

/* OpenPGP credentials */

544

ret = gnutls_certificate_allocate_credentials(&mc->cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

545

427

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

548

433

gnutls_global_deinit();

549

434

return -1;

550

435

}

551

436

552

437

if(debug){

553

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

554

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

555

pubkeyfilename,

556

seckeyfilename);

438

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

439

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

440

seckeyfilename);

557

441

}

558

442

559

443

ret = gnutls_certificate_set_openpgp_key_file

560

(mc->cred, pubkeyfilename, seckeyfilename,

444

(mc.cred, pubkeyfilename, seckeyfilename,

561

445

GNUTLS_OPENPGP_FMT_BASE64);

562

446

if(ret != GNUTLS_E_SUCCESS){

563

fprintf_plus(stderr,

564

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

565

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

566

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

567

safer_gnutls_strerror(ret));

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

568

452

goto globalfail;

569

453

}

570

454

571

455

/* GnuTLS server initialization */

572

ret = gnutls_dh_params_init(&mc->dh_params);

573

if(ret != GNUTLS_E_SUCCESS){

574

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

575

" initialization: %s\n",

576

safer_gnutls_strerror(ret));

577

goto globalfail;

578

}

579

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

580

if(dhparamsfilename != NULL){

581

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

582

do {

583

int dhpfile = open(dhparamsfilename, O_RDONLY);

584

if(dhpfile == -1){

585

perror_plus("open");

586

dhparamsfilename = NULL;

587

break;

588

}

589

size_t params_capacity = 0;

590

while(true){

591

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

592

(size_t)params.size,

593

(size_t)params_capacity);

594

if(params_capacity == 0){

595

perror_plus("incbuffer");

596

free(params.data);

597

params.data = NULL;

598

dhparamsfilename = NULL;

599

break;

600

}

601

ssize_t bytes_read = read(dhpfile,

602

params.data + params.size,

603

BUFFER_SIZE);

604

/* EOF */

605

if(bytes_read == 0){

606

break;

607

}

608

/* check bytes_read for failure */

609

if(bytes_read < 0){

610

perror_plus("read");

611

free(params.data);

612

params.data = NULL;

613

dhparamsfilename = NULL;

614

break;

615

}

616

params.size += (unsigned int)bytes_read;

617

}

618

if(params.data == NULL){

619

dhparamsfilename = NULL;

620

}

621

if(dhparamsfilename == NULL){

622

break;

623

}

624

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

625

GNUTLS_X509_FMT_PEM);

626

if(ret != GNUTLS_E_SUCCESS){

627

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

628

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

629

safer_gnutls_strerror(ret));

630

dhparamsfilename = NULL;

631

}

632

} while(false);

633

}

634

if(dhparamsfilename == NULL){

635

if(mc->dh_bits == 0){

636

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

637

/* Try to read the private key file */

638

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

639

do {

640

int secfile = open(seckeyfilename, O_RDONLY);

641

if(secfile == -1){

642

perror_plus("open");

643

break;

644

}

645

size_t buffer_capacity = 0;

646

while(true){

647

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

648

(size_t)buffer.size,

649

(size_t)buffer_capacity);

650

if(buffer_capacity == 0){

651

perror_plus("incbuffer");

652

free(buffer.data);

653

buffer.data = NULL;

654

break;

655

}

656

ssize_t bytes_read = read(secfile,

657

buffer.data + buffer.size,

658

BUFFER_SIZE);

659

/* EOF */

660

if(bytes_read == 0){

661

break;

662

}

663

/* check bytes_read for failure */

664

if(bytes_read < 0){

665

perror_plus("read");

666

free(buffer.data);

667

buffer.data = NULL;

668

break;

669

}

670

buffer.size += (unsigned int)bytes_read;

671

}

672

close(secfile);

673

} while(false);

674

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

675

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

676

if(buffer.data != NULL){

677

{

678

gnutls_openpgp_privkey_t privkey = NULL;

679

ret = gnutls_openpgp_privkey_init(&privkey);

680

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error initializing OpenPGP key"

682

" structure: %s",

683

safer_gnutls_strerror(ret));

684

free(buffer.data);

685

buffer.data = NULL;

686

} else {

687

ret = gnutls_openpgp_privkey_import

688

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

689

if(ret != GNUTLS_E_SUCCESS){

690

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

691

safer_gnutls_strerror(ret));

692

privkey = NULL;

693

}

694

free(buffer.data);

695

buffer.data = NULL;

696

if(privkey != NULL){

697

/* Use private key to suggest an appropriate

698

sec_param */

699

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

700

gnutls_openpgp_privkey_deinit(privkey);

701

if(debug){

702

fprintf_plus(stderr, "This OpenPGP key implies using"

703

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

704

safe_string(gnutls_sec_param_get_name

705

(sec_param)));

706

}

707

}

708

}

709

}

710

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

711

/* Err on the side of caution */

712

sec_param = GNUTLS_SEC_PARAM_ULTRA;

713

if(debug){

714

fprintf_plus(stderr, "Falling back to security parameter"

715

" \"%s\"\n",

716

safe_string(gnutls_sec_param_get_name

717

(sec_param)));

718

}

719

}

720

}

721

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

722

if(uret != 0){

723

mc->dh_bits = uret;

724

if(debug){

725

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

726

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

727

safe_string(gnutls_sec_param_get_name

728

(sec_param)),

729

mc->dh_bits);

730

}

731

} else {

732

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

733

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

734

safe_string(gnutls_sec_param_get_name

735

(sec_param)),

736

safer_gnutls_strerror(ret));

737

goto globalfail;

738

}

739

} else if(debug){

740

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

741

mc->dh_bits);

742

}

743

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

744

if(ret != GNUTLS_E_SUCCESS){

745

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

746

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

747

safer_gnutls_strerror(ret));

748

goto globalfail;

749

}

750

}

751

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

456

ret = gnutls_dh_params_init(&mc.dh_params);

457

if(ret != GNUTLS_E_SUCCESS){

458

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

459

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

460

goto globalfail;

461

}

462

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

463

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

466

goto globalfail;

467

}

468

469

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

752

470

753

471

return 0;

754

472

755

473

globalfail:

756

474

757

gnutls_certificate_free_credentials(mc->cred);

475

gnutls_certificate_free_credentials(mc.cred);

758

476

gnutls_global_deinit();

759

gnutls_dh_params_deinit(mc->dh_params);

477

gnutls_dh_params_deinit(mc.dh_params);

760

478

return -1;

761

479

}

762

480

763

__attribute__((nonnull, warn_unused_result))

764

static int init_gnutls_session(gnutls_session_t *session,

765

mandos_context *mc){

481

static int init_gnutls_session(gnutls_session_t *session){

766

482

int ret;

767

483

/* GnuTLS session creation */

768

484

do {

772

488

}

773

489

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

774

490

if(ret != GNUTLS_E_SUCCESS){

775

fprintf_plus(stderr,

776

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

777

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

778

493

}

779

494

780

495

{

781

496

const char *err;

782

497

do {

783

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

498

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

784

499

if(quit_now){

785

500

gnutls_deinit(*session);

786

501

return -1;

787

502

}

788

503

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

789

504

if(ret != GNUTLS_E_SUCCESS){

790

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

791

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

792

safer_gnutls_strerror(ret));

505

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

506

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

507

safer_gnutls_strerror(ret));

793

508

gnutls_deinit(*session);

794

509

return -1;

795

510

}

797

512

798

513

do {

799

514

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

800

mc->cred);

515

mc.cred);

801

516

if(quit_now){

802

517

gnutls_deinit(*session);

803

518

return -1;

804

519

}

805

520

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

806

521

if(ret != GNUTLS_E_SUCCESS){

807

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

808

safer_gnutls_strerror(ret));

522

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

523

safer_gnutls_strerror(ret));

809

524

gnutls_deinit(*session);

810

525

return -1;

811

526

}

813

528

/* ignore client certificate if any. */

814

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

815

530

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

532

816

533

return 0;

817

534

}

818

535

820

537

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

821

538

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

822

539

823

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

824

__attribute__((warn_unused_result))

825

error_t raise_privileges(void){

826

error_t old_errno = errno;

827

error_t ret_errno = 0;

828

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

829

ret_errno = errno;

830

}

831

errno = old_errno;

832

return ret_errno;

833

}

834

835

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

836

__attribute__((warn_unused_result))

837

error_t raise_privileges_permanently(void){

838

error_t old_errno = errno;

839

error_t ret_errno = raise_privileges();

840

if(ret_errno != 0){

841

errno = old_errno;

842

return ret_errno;

843

}

844

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

845

ret_errno = errno;

846

}

847

errno = old_errno;

848

return ret_errno;

849

}

850

851

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

852

__attribute__((warn_unused_result))

853

error_t lower_privileges(void){

854

error_t old_errno = errno;

855

error_t ret_errno = 0;

856

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

857

ret_errno = errno;

858

}

859

errno = old_errno;

860

return ret_errno;

861

}

862

863

/* Lower privileges permanently */

864

__attribute__((warn_unused_result))

865

error_t lower_privileges_permanently(void){

866

error_t old_errno = errno;

867

error_t ret_errno = 0;

868

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

869

ret_errno = errno;

870

}

871

errno = old_errno;

872

return ret_errno;

873

}

874

875

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

876

__attribute__((nonnull, warn_unused_result))

877

static bool add_delete_local_route(const bool add,

878

const char *address,

879

AvahiIfIndex if_index){

880

int ret;

881

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

882

char add_arg[] = "add";

883

char delete_arg[] = "delete";

884

char debug_flag[] = "--debug";

885

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

886

if(pluginhelperdir == NULL){

887

if(debug){

888

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

889

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

890

}

891

return false;

892

}

893

894

char interface[IF_NAMESIZE];

895

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

896

perror_plus("if_indextoname");

897

return false;

898

}

899

900

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

901

if(devnull == -1){

902

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

903

return false;

904

}

905

pid_t pid = fork();

906

if(pid == 0){

907

/* Child */

908

/* Raise privileges */

909

errno = raise_privileges_permanently();

910

if(errno != 0){

911

perror_plus("Failed to raise privileges");

912

/* _exit(EX_NOPERM); */

913

} else {

914

/* Set group */

915

errno = 0;

916

ret = setgid(0);

917

if(ret == -1){

918

perror_plus("setgid");

919

_exit(EX_NOPERM);

920

}

921

/* Reset supplementary groups */

922

errno = 0;

923

ret = setgroups(0, NULL);

924

if(ret == -1){

925

perror_plus("setgroups");

926

_exit(EX_NOPERM);

927

}

928

}

929

ret = dup2(devnull, STDIN_FILENO);

930

if(ret == -1){

931

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

932

_exit(EX_OSERR);

933

}

934

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

935

if(ret == -1){

936

perror_plus("close");

937

_exit(EX_OSERR);

938

}

939

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

940

if(ret == -1){

941

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

942

_exit(EX_OSERR);

943

}

944

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

945

O_RDONLY

946

| O_DIRECTORY

947

| O_PATH

948

| O_CLOEXEC));

949

if(helperdir_fd == -1){

950

perror_plus("open");

951

_exit(EX_UNAVAILABLE);

952

}

953

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

954

helper, O_RDONLY));

955

if(helper_fd == -1){

956

perror_plus("openat");

957

_exit(EX_UNAVAILABLE);

958

}

959

TEMP_FAILURE_RETRY(close(helperdir_fd));

960

#ifdef __GNUC__

961

#pragma GCC diagnostic push

962

#pragma GCC diagnostic ignored "-Wcast-qual"

963

#endif

964

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

965

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

966

interface, debug ? debug_flag : NULL, NULL },

967

environ) == -1){

968

#ifdef __GNUC__

969

#pragma GCC diagnostic pop

970

#endif

971

perror_plus("fexecve");

972

_exit(EXIT_FAILURE);

973

}

974

}

975

if(pid == -1){

976

perror_plus("fork");

977

return false;

978

}

979

int status;

980

pid_t pret = -1;

981

errno = 0;

982

do {

983

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

984

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

985

int errno_raising = 0;

986

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

987

errno_raising = errno;

988

perror_plus("Failed to raise privileges in order to"

989

" kill helper program");

990

}

991

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

992

perror_plus("kill");

993

}

994

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

995

perror_plus("Failed to lower privileges after killing"

996

" helper program");

997

}

998

return false;

999

}

1000

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

1001

if(pret == -1){

1002

perror_plus("waitpid");

1003

return false;

1004

}

1005

if(WIFEXITED(status)){

1006

if(WEXITSTATUS(status) != 0){

1007

fprintf_plus(stderr, "Error: iprouteadddel exited"

1008

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

1009

return false;

1010

}

1011

return true;

1012

}

1013

if(WIFSIGNALED(status)){

1014

fprintf_plus(stderr, "Error: iprouteadddel died by"

1015

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

1016

return false;

1017

}

1018

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

1019

return false;

1020

}

1021

1022

__attribute__((nonnull, warn_unused_result))

1023

static bool add_local_route(const char *address,

1024

AvahiIfIndex if_index){

1025

if(debug){

1026

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

1027

}

1028

return add_delete_local_route(true, address, if_index);

1029

}

1030

1031

__attribute__((nonnull, warn_unused_result))

1032

static bool delete_local_route(const char *address,

1033

AvahiIfIndex if_index){

1034

if(debug){

1035

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

1036

}

1037

return add_delete_local_route(false, address, if_index);

1038

}

1039

1040

540

/* Called when a Mandos server is found */

1041

__attribute__((nonnull, warn_unused_result))

1042

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

541

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

1043

542

AvahiIfIndex if_index,

1044

int af, mandos_context *mc){

543

int af){

1045

544

int ret, tcp_sd = -1;

1046

545

ssize_t sret;

1047

struct sockaddr_storage to;

546

union {

547

struct sockaddr_in in;

548

struct sockaddr_in6 in6;

549

} to;

1048

550

char *buffer = NULL;

1049

551

char *decrypted_buffer = NULL;

1050

552

size_t buffer_length = 0;

1053

555

int retval = -1;

1054

556

gnutls_session_t session;

1055

557

int pf; /* Protocol family */

1056

bool route_added = false;

1057

558

1058

559

errno = 0;

1059

560

1070

571

pf = PF_INET;

1071

572

break;

1072

573

default:

1073

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

574

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

1074

575

errno = EINVAL;

1075

576

return -1;

1076

577

}

1077

578

1078

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

1079

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

1080

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

1081

bool match = false;

1082

{

1083

char *interface = NULL;

1084

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

1085

interface))){

1086

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

1087

match = true;

1088

break;

1089

}

1090

}

1091

}

1092

if(not match){

1093

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

1094

connect to the server */

1095

if(debug){

1096

char interface[IF_NAMESIZE];

1097

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

1098

perror_plus("if_indextoname");

1099

} else {

1100

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

1101

" \"%s\"\n",

1102

if_indextoname((unsigned int)if_index,

1103

interface));

1104

}

1105

}

1106

return -1;

1107

}

1108

}

1109

1110

ret = init_gnutls_session(&session, mc);

579

ret = init_gnutls_session(&session);

1111

580

if(ret != 0){

1112

581

return -1;

1113

582

}

1114

583

1115

584

if(debug){

1116

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

1117

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

585

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

586

"\n", ip, port);

1118

587

}

1119

588

1120

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

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

590

if(tcp_sd < 0){

1122

591

int e = errno;

1123

perror_plus("socket");

592

perror("socket");

1124

593

errno = e;

1125

594

goto mandos_end;

1126

595

}

1132

601

1133

602

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

1134

603

if(af == AF_INET6){

1135

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

1136

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

604

to.in6.sin6_family = (sa_family_t)af;

605

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

1137

606

} else { /* IPv4 */

1138

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

1139

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

607

to.in.sin_family = (sa_family_t)af;

608

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

1140

609

}

1141

610

if(ret < 0 ){

1142

611

int e = errno;

1143

perror_plus("inet_pton");

612

perror("inet_pton");

1144

613

errno = e;

1145

614

goto mandos_end;

1146

615

}

1147

616

if(ret == 0){

1148

617

int e = errno;

1149

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

618

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

1150

619

errno = e;

1151

620

goto mandos_end;

1152

621

}

1153

622

if(af == AF_INET6){

1154

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

1155

if(IN6_IS_ADDR_LINKLOCAL

1156

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

623

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

624

-Wconversion and

625

-Wunreachable-code */

626

627

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

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

629

-Wunreachable-code*/

1157

630

if(if_index == AVAHI_IF_UNSPEC){

1158

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

1159

" incomplete without a network interface\n");

631

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

632

" without a network interface\n");

1160

633

errno = EINVAL;

1161

634

goto mandos_end;

1162

635

}

1163

636

/* Set the network interface number as scope */

1164

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

637

to.in6.sin6_scope_id = (uint32_t)if_index;

1165

638

}

1166

639

} else {

1167

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

640

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

641

-Wconversion and

642

-Wunreachable-code */

1168

643

}

1169

644

1170

645

if(quit_now){

1176

651

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

1177

652

char interface[IF_NAMESIZE];

1178

653

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

1179

perror_plus("if_indextoname");

654

perror("if_indextoname");

1180

655

} else {

1181

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

1182

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

656

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

657

ip, interface, port);

1183

658

}

1184

659

} else {

1185

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

1186

ip, (uintmax_t)port);

660

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

661

port);

1187

662

}

1188

663

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1189

664

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1190

if(af == AF_INET6){

1191

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

1192

sizeof(struct sockaddr_in6),

1193

addrstr, sizeof(addrstr), NULL, 0,

1194

NI_NUMERICHOST);

1195

} else {

1196

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

1197

sizeof(struct sockaddr_in),

1198

addrstr, sizeof(addrstr), NULL, 0,

1199

NI_NUMERICHOST);

1200

}

1201

if(ret == EAI_SYSTEM){

1202

perror_plus("getnameinfo");

1203

} else if(ret != 0) {

1204

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

1205

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

1206

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

1207

}

1208

}

1209

1210

if(quit_now){

1211

errno = EINTR;

1212

goto mandos_end;

1213

}

1214

1215

while(true){

1216

if(af == AF_INET6){

1217

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

1218

sizeof(struct sockaddr_in6));

1219

} else {

1220

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

1221

sizeof(struct sockaddr_in));

1222

}

1223

if(ret < 0){

1224

if(errno == ENETUNREACH

1225

and if_index != AVAHI_IF_UNSPEC

1226

and connect_to == NULL

1227

and not route_added and

1228

((af == AF_INET6 and not

1229

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1230

&to)->sin6_addr)))

1231

or (af == AF_INET and

1232

/* Not a a IPv4LL address */

1233

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

1234

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

1235

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

1236

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

1237

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

1238

connect to a Mandos server announced by Avahi on a server

1239

host with a global address. Work around this by retrying

1240

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

1241

1242

Avahi bug reference:

1243

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

1244

https://bugs.debian.org/587961

1245

*/

1246

if(debug){

1247

fprintf_plus(stderr, "Mandos server unreachable, trying"

1248

" direct route\n");

1249

}

1250

int e = errno;

1251

route_added = add_local_route(ip, if_index);

1252

if(route_added){

1253

continue;

1254

}

1255

errno = e;

1256

}

1257

if(errno != ECONNREFUSED or debug){

1258

int e = errno;

1259

perror_plus("connect");

1260

errno = e;

1261

}

1262

goto mandos_end;

1263

}

1264

1265

if(quit_now){

1266

errno = EINTR;

1267

goto mandos_end;

1268

}

1269

break;

665

const char *pcret;

666

if(af == AF_INET6){

667

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

668

sizeof(addrstr));

669

} else {

670

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

671

sizeof(addrstr));

672

}

673

if(pcret == NULL){

674

perror("inet_ntop");

675

} else {

676

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

677

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

678

}

679

}

680

}

681

682

if(quit_now){

683

errno = EINTR;

684

goto mandos_end;

685

}

686

687

if(af == AF_INET6){

688

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

689

} else {

690

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

691

}

692

if(ret < 0){

693

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

694

int e = errno;

695

perror("connect");

696

errno = e;

697

}

698

goto mandos_end;

699

}

700

701

if(quit_now){

702

errno = EINTR;

703

goto mandos_end;

1270

704

}

1271

705

1272

706

const char *out = mandos_protocol_version;

1274

708

while(true){

1275

709

size_t out_size = strlen(out);

1276

710

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

1277

out_size - written));

711

out_size - written));

1278

712

if(ret == -1){

1279

713

int e = errno;

1280

perror_plus("write");

714

perror("write");

1281

715

errno = e;

1282

716

goto mandos_end;

1283

717

}

1300

734

}

1301

735

1302

736

if(debug){

1303

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

737

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

1304

738

}

1305

739

1306

740

if(quit_now){

1307

741

errno = EINTR;

1308

742

goto mandos_end;

1309

743

}

1310

1311

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

1312

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

1313

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

1314

gnutls_transport_set_ptr(session,

1315

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

744

745

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

746

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1316

747

1317

748

if(quit_now){

1318

749

errno = EINTR;

1329

760

1330

761

if(ret != GNUTLS_E_SUCCESS){

1331

762

if(debug){

1332

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

763

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

1333

764

gnutls_perror(ret);

1334

765

}

1335

766

errno = EPROTO;

1339

770

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

1340

771

1341

772

if(debug){

1342

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1343

" %s\n", ip);

773

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

774

ip);

1344

775

}

1345

776

1346

777

while(true){

1351

782

}

1352

783

1353

784

buffer_capacity = incbuffer(&buffer, buffer_length,

1354

buffer_capacity);

785

buffer_capacity);

1355

786

if(buffer_capacity == 0){

1356

787

int e = errno;

1357

perror_plus("incbuffer");

788

perror("incbuffer");

1358

789

errno = e;

1359

790

goto mandos_end;

1360

791

}

1384

815

}

1385

816

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

1386

817

if(ret < 0){

1387

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

1388

"***\n");

818

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

1389

819

gnutls_perror(ret);

1390

820

errno = EPROTO;

1391

821

goto mandos_end;

1392

822

}

1393

823

break;

1394

824

default:

1395

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

1396

" encrypted session with Mandos server\n");

825

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

826

" encrypted session with Mandos server\n");

1397

827

gnutls_bye(session, GNUTLS_SHUT_RDWR);

1398

828

errno = EIO;

1399

829

goto mandos_end;

1404

834

}

1405

835

1406

836

if(debug){

1407

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

837

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

1408

838

}

1409

839

1410

840

if(quit_now){

1422

852

1423

853

if(buffer_length > 0){

1424

854

ssize_t decrypted_buffer_size;

1425

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1426

&decrypted_buffer, mc);

855

decrypted_buffer_size = pgp_packet_decrypt(buffer,

856

buffer_length,

857

&decrypted_buffer);

1427

858

if(decrypted_buffer_size >= 0){

1428

859

1429

860

written = 0;

1439

870

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

1440

871

int e = errno;

1441

872

if(debug){

1442

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

1443

strerror(errno));

873

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

874

strerror(errno));

1444

875

}

1445

876

errno = e;

1446

877

goto mandos_end;

1455

886

1456

887

mandos_end:

1457

888

{

1458

if(route_added){

1459

if(not delete_local_route(ip, if_index)){

1460

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

1461

" interface %d", ip, if_index);

1462

}

1463

}

1464

889

int e = errno;

1465

890

free(decrypted_buffer);

1466

891

free(buffer);

1471

896

if(e == 0){

1472

897

e = errno;

1473

898

}

1474

perror_plus("close");

899

perror("close");

1475

900

}

1476

901

gnutls_deinit(session);

1477

errno = e;

1478

902

if(quit_now){

1479

errno = EINTR;

903

e = EINTR;

1480

904

retval = -1;

1481

905

}

906

errno = e;

1482

907

}

1483

908

return retval;

1484

909

}

1485

910

1486

__attribute__((nonnull))

1487

911

static void resolve_callback(AvahiSServiceResolver *r,

1488

912

AvahiIfIndex interface,

1489

913

AvahiProtocol proto,

1497

921

AVAHI_GCC_UNUSED AvahiStringList *txt,

1498

922

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1499

923

flags,

1500

void *mc){

1501

if(r == NULL){

1502

return;

1503

}

924

AVAHI_GCC_UNUSED void* userdata){

925

assert(r);

1504

926

1505

927

/* Called whenever a service has been resolved successfully or

1506

928

timed out */

1507

929

1508

930

if(quit_now){

1509

avahi_s_service_resolver_free(r);

1510

931

return;

1511

932

}

1512

933

1513

934

switch(event){

1514

935

default:

1515

936

case AVAHI_RESOLVER_FAILURE:

1516

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

1517

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

1518

domain,

1519

avahi_strerror(avahi_server_errno

1520

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

937

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

938

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

939

avahi_strerror(avahi_server_errno(mc.server)));

1521

940

break;

1522

941

1523

942

case AVAHI_RESOLVER_FOUND:

1525

944

char ip[AVAHI_ADDRESS_STR_MAX];

1526

945

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

1527

946

if(debug){

1528

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

1529

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

1530

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

947

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

948

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

949

ip, (intmax_t)interface, port);

1531

950

}

1532

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

1533

interface,

1534

avahi_proto_to_af(proto),

1535

mc);

951

int ret = start_mandos_communication(ip, port, interface,

952

avahi_proto_to_af(proto));

1536

953

if(ret == 0){

1537

avahi_simple_poll_quit(simple_poll);

1538

} else {

1539

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

1540

avahi_proto_to_af(proto),

1541

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

1542

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

1543

" list\n", name);

1544

}

954

avahi_simple_poll_quit(mc.simple_poll);

1545

955

}

1546

956

}

1547

957

}

1557

967

const char *domain,

1558

968

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1559

969

flags,

1560

void *mc){

1561

if(b == NULL){

1562

return;

1563

}

970

AVAHI_GCC_UNUSED void* userdata){

971

assert(b);

1564

972

1565

973

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

1566

974

is removed from the LAN */

1573

981

default:

1574

982

case AVAHI_BROWSER_FAILURE:

1575

983

1576

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

1577

avahi_strerror(avahi_server_errno

1578

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

1579

avahi_simple_poll_quit(simple_poll);

984

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

985

avahi_strerror(avahi_server_errno(mc.server)));

986

avahi_simple_poll_quit(mc.simple_poll);

1580

987

return;

1581

988

1582

989

case AVAHI_BROWSER_NEW:

1585

992

the callback function is called the Avahi server will free the

1586

993

resolver for us. */

1587

994

1588

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

1589

interface, protocol, name, type,

1590

domain, protocol, 0,

1591

resolve_callback, mc) == NULL)

1592

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

1593

" %s\n", name,

1594

avahi_strerror(avahi_server_errno

1595

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

995

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

996

name, type, domain, protocol, 0,

997

resolve_callback, NULL) == NULL)

998

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

999

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

1596

1000

break;

1597

1001

1598

1002

case AVAHI_BROWSER_REMOVE:

1601

1005

case AVAHI_BROWSER_ALL_FOR_NOW:

1602

1006

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1603

1007

if(debug){

1604

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

1605

" searching...\n");

1008

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

1606

1009

}

1607

1010

break;

1608

1011

}

1609

1012

}

1610

1013

1611

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

1014

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

1612

1015

static void handle_sigterm(int sig){

1613

1016

if(quit_now){

1614

1017

return;

1616

1019

quit_now = 1;

1617

1020

signal_received = sig;

1618

1021

int old_errno = errno;

1619

/* set main loop to exit */

1620

if(simple_poll != NULL){

1621

avahi_simple_poll_quit(simple_poll);

1022

if(mc.simple_poll != NULL){

1023

avahi_simple_poll_quit(mc.simple_poll);

1622

1024

}

1623

1025

errno = old_errno;

1624

1026

}

1625

1027

1626

__attribute__((nonnull, warn_unused_result))

1627

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

1628

int ret;

1629

error_t ret_errno;

1630

1631

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

1632

if(s < 0){

1633

ret_errno = errno;

1634

perror_plus("socket");

1635

errno = ret_errno;

1636

return false;

1637

}

1638

strcpy(ifr->ifr_name, ifname);

1639

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1640

if(ret == -1){

1028

/*

1029

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

1030

* corresponds to an acceptable network device.

1031

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

1032

*/

1033

int good_interface(const struct dirent *if_entry){

1034

ssize_t ssret;

1035

char *flagname = NULL;

1036

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

1037

return 0;

1038

}

1039

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

1040

if_entry->d_name);

1041

if(ret < 0){

1042

perror("asprintf");

1043

return 0;

1044

}

1045

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

1046

if(flags_fd == -1){

1047

perror("open");

1048

free(flagname);

1049

return 0;

1050

}

1051

free(flagname);

1052

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

1053

/* read line from flags_fd */

1054

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

1055

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

1056

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

1057

if(flagstring == NULL){

1058

perror("malloc");

1059

close(flags_fd);

1060

return 0;

1061

}

1062

while(to_read > 0){

1063

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

1064

(size_t)to_read));

1065

if(ssret == -1){

1066

perror("read");

1067

free(flagstring);

1068

close(flags_fd);

1069

return 0;

1070

}

1071

to_read -= ssret;

1072

if(ssret == 0){

1073

break;

1074

}

1075

}

1076

close(flags_fd);

1077

intmax_t tmpmax;

1078

char *tmp;

1079

errno = 0;

1080

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

1081

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

1082

and not (isspace(*tmp)))

1083

or tmpmax != (ifreq_flags)tmpmax){

1641

1084

if(debug){

1642

ret_errno = errno;

1643

perror_plus("ioctl SIOCGIFFLAGS");

1644

errno = ret_errno;

1085

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

1086

flagstring, if_entry->d_name);

1645

1087

}

1646

return false;

1088

free(flagstring);

1089

return 0;

1647

1090

}

1648

return true;

1649

}

1650

1651

__attribute__((nonnull, warn_unused_result))

1652

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

1653

1091

free(flagstring);

1092

ifreq_flags flags = (ifreq_flags)tmpmax;

1654

1093

/* Reject the loopback device */

1655

if(ifr->ifr_flags & IFF_LOOPBACK){

1094

if(flags & IFF_LOOPBACK){

1656

1095

if(debug){

1657

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

1658

ifname);

1096

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

1097

if_entry->d_name);

1659

1098

}

1660

return false;

1099

return 0;

1661

1100

}

1662

1101

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

1663

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

1102

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

1664

1103

if(debug){

1665

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

1666

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

1104

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

1105

if_entry->d_name);

1667

1106

}

1668

return true;

1107

return 1;

1669

1108

}

1670

1109

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

1671

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

1110

if(not (flags & IFF_BROADCAST)){

1672

1111

if(debug){

1673

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1674

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

1112

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

1113

if_entry->d_name);

1675

1114

}

1676

return false;

1115

return 0;

1677

1116

}

1678

1117

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

1679

if(ifr->ifr_flags & IFF_NOARP){

1118

if(flags & IFF_NOARP){

1680

1119

if(debug){

1681

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

1682

ifname);

1120

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

1121

if_entry->d_name);

1683

1122

}

1684

return false;

1123

return 0;

1685

1124

}

1686

1687

1125

/* Accept this device */

1688

1126

if(debug){

1689

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

1690

}

1691

return true;

1692

}

1693

1694

/*

1695

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

1696

* corresponds to an acceptable network device.

1697

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

1698

*/

1699

__attribute__((nonnull, warn_unused_result))

1700

int good_interface(const struct dirent *if_entry){

1701

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

1702

return 0;

1703

}

1704

1705

struct ifreq ifr;

1706

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

1707

if(debug){

1708

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

1709

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

1710

}

1711

return 0;

1712

}

1713

1714

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

1715

return 0;

1127

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

1128

if_entry->d_name);

1716

1129

}

1717

1130

return 1;

1718

1131

}

1719

1132

1720

/*

1721

* This function determines if a network interface is up.

1722

*/

1723

__attribute__((nonnull, warn_unused_result))

1724

bool interface_is_up(const char *interface){

1725

struct ifreq ifr;

1726

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

1727

if(debug){

1728

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

1729

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

1730

}

1731

return false;

1732

}

1733

1734

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

1735

}

1736

1737

/*

1738

* This function determines if a network interface is running

1739

*/

1740

__attribute__((nonnull, warn_unused_result))

1741

bool interface_is_running(const char *interface){

1742

struct ifreq ifr;

1743

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

1744

if(debug){

1745

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

1746

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

1747

}

1748

return false;

1749

}

1750

1751

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

1752

}

1753

1754

__attribute__((nonnull, pure, warn_unused_result))

1755

1133

int notdotentries(const struct dirent *direntry){

1756

1134

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

1757

1135

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

1763

1141

return 1;

1764

1142

}

1765

1143

1766

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

1767

__attribute__((nonnull, warn_unused_result))

1768

int runnable_hook(const struct dirent *direntry){

1769

int ret;

1770

size_t sret;

1771

struct stat st;

1772

1773

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

1774

/* Empty name? */

1775

return 0;

1776

}

1777

1778

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

1779

"abcdefghijklmnopqrstuvwxyz"

1780

"0123456789"

1781

"_.-");

1782

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

1783

/* Contains non-allowed characters */

1784

if(debug){

1785

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

1786

direntry->d_name);

1787

}

1788

return 0;

1789

}

1790

1791

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

1792

if(ret == -1){

1793

if(debug){

1794

perror_plus("Could not stat hook");

1795

}

1796

return 0;

1797

}

1798

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

1799

/* Not a regular file */

1800

if(debug){

1801

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

1802

direntry->d_name);

1803

}

1804

return 0;

1805

}

1806

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

1807

/* Not executable */

1808

if(debug){

1809

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

1810

direntry->d_name);

1811

}

1812

return 0;

1813

}

1814

if(debug){

1815

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

1816

direntry->d_name);

1817

}

1818

return 1;

1819

}

1820

1821

__attribute__((nonnull, warn_unused_result))

1822

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1823

mandos_context *mc){

1824

int ret;

1825

struct timespec now;

1826

struct timespec waited_time;

1827

intmax_t block_time;

1828

1829

while(true){

1830

if(mc->current_server == NULL){

1831

if(debug){

1832

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

1833

" No timeout!\n");

1834

}

1835

ret = avahi_simple_poll_iterate(s, -1);

1836

} else {

1837

if(debug){

1838

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

1839

" it, or wait\n");

1840

}

1841

/* the current time */

1842

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1843

if(ret == -1){

1844

perror_plus("clock_gettime");

1845

return -1;

1846

}

1847

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

1848

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

1849

waited_time.tv_sec = (now.tv_sec

1850

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

1851

waited_time.tv_nsec = (now.tv_nsec

1852

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

1853

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

1854

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

1855

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

1856

block_time = ((retry_interval

1857

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

1858

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

1859

1860

if(debug){

1861

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

1862

block_time);

1863

}

1864

1865

if(block_time <= 0){

1866

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

1867

mc->current_server->port,

1868

mc->current_server->if_index,

1869

mc->current_server->af, mc);

1870

if(ret == 0){

1871

avahi_simple_poll_quit(s);

1872

return 0;

1873

}

1874

ret = clock_gettime(CLOCK_MONOTONIC,

1875

&mc->current_server->last_seen);

1876

if(ret == -1){

1877

perror_plus("clock_gettime");

1878

return -1;

1879

}

1880

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

1881

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

1882

servers, but don't block */

1883

}

1884

1885

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

1886

}

1887

if(ret != 0){

1888

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

1889

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

1890

}

1891

}

1892

}

1893

}

1894

1895

__attribute__((nonnull))

1896

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

1897

const float delay){

1898

struct dirent **direntries = NULL;

1899

if(hookdir_fd == -1){

1900

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1901

| O_CLOEXEC);

1902

if(hookdir_fd == -1){

1903

if(errno == ENOENT){

1904

if(debug){

1905

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

1906

" found\n", hookdir);

1907

}

1908

} else {

1909

perror_plus("open");

1910

}

1911

return;

1912

}

1913

}

1914

#ifdef __GLIBC__

1915

#if __GLIBC_PREREQ(2, 15)

1916

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

1917

runnable_hook, alphasort);

1918

#else /* not __GLIBC_PREREQ(2, 15) */

1919

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

1920

alphasort);

1921

#endif /* not __GLIBC_PREREQ(2, 15) */

1922

#else /* not __GLIBC__ */

1923

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

1924

alphasort);

1925

#endif /* not __GLIBC__ */

1926

if(numhooks == -1){

1927

perror_plus("scandir");

1928

return;

1929

}

1930

struct dirent *direntry;

1931

int ret;

1932

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

1933

if(devnull == -1){

1934

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

1935

return;

1936

}

1937

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

1938

direntry = direntries[i];

1939

if(debug){

1940

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

1941

direntry->d_name);

1942

}

1943

pid_t hook_pid = fork();

1944

if(hook_pid == 0){

1945

/* Child */

1946

/* Raise privileges */

1947

errno = raise_privileges_permanently();

1948

if(errno != 0){

1949

perror_plus("Failed to raise privileges");

1950

_exit(EX_NOPERM);

1951

}

1952

/* Set group */

1953

errno = 0;

1954

ret = setgid(0);

1955

if(ret == -1){

1956

perror_plus("setgid");

1957

_exit(EX_NOPERM);

1958

}

1959

/* Reset supplementary groups */

1960

errno = 0;

1961

ret = setgroups(0, NULL);

1962

if(ret == -1){

1963

perror_plus("setgroups");

1964

_exit(EX_NOPERM);

1965

}

1966

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

1967

if(ret == -1){

1968

perror_plus("setenv");

1969

_exit(EX_OSERR);

1970

}

1971

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

1972

if(ret == -1){

1973

perror_plus("setenv");

1974

_exit(EX_OSERR);

1975

}

1976

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

1977

if(ret == -1){

1978

perror_plus("setenv");

1979

_exit(EX_OSERR);

1980

}

1981

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

1982

if(ret == -1){

1983

perror_plus("setenv");

1984

_exit(EX_OSERR);

1985

}

1986

char *delaystring;

1987

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

1988

if(ret == -1){

1989

perror_plus("asprintf");

1990

_exit(EX_OSERR);

1991

}

1992

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

1993

if(ret == -1){

1994

free(delaystring);

1995

perror_plus("setenv");

1996

_exit(EX_OSERR);

1997

}

1998

free(delaystring);

1999

if(connect_to != NULL){

2000

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

2001

if(ret == -1){

2002

perror_plus("setenv");

2003

_exit(EX_OSERR);

2004

}

2005

}

2006

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

2007

direntry->d_name,

2008

O_RDONLY));

2009

if(hook_fd == -1){

2010

perror_plus("openat");

2011

_exit(EXIT_FAILURE);

2012

}

2013

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

2014

perror_plus("close");

2015

_exit(EXIT_FAILURE);

2016

}

2017

ret = dup2(devnull, STDIN_FILENO);

2018

if(ret == -1){

2019

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

2020

_exit(EX_OSERR);

2021

}

2022

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

2023

if(ret == -1){

2024

perror_plus("close");

2025

_exit(EX_OSERR);

2026

}

2027

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2028

if(ret == -1){

2029

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

2030

_exit(EX_OSERR);

2031

}

2032

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

2033

environ) == -1){

2034

perror_plus("fexecve");

2035

_exit(EXIT_FAILURE);

2036

}

2037

} else {

2038

if(hook_pid == -1){

2039

perror_plus("fork");

2040

free(direntry);

2041

continue;

2042

}

2043

int status;

2044

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

2045

perror_plus("waitpid");

2046

free(direntry);

2047

continue;

2048

}

2049

if(WIFEXITED(status)){

2050

if(WEXITSTATUS(status) != 0){

2051

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

2052

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

2053

WEXITSTATUS(status));

2054

free(direntry);

2055

continue;

2056

}

2057

} else if(WIFSIGNALED(status)){

2058

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

2059

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

2060

WTERMSIG(status));

2061

free(direntry);

2062

continue;

2063

} else {

2064

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

2065

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

2066

free(direntry);

2067

continue;

2068

}

2069

}

2070

if(debug){

2071

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

2072

direntry->d_name);

2073

}

2074

free(direntry);

2075

}

2076

free(direntries);

2077

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

2078

perror_plus("close");

2079

} else {

2080

hookdir_fd = -1;

2081

}

2082

close(devnull);

2083

}

2084

2085

__attribute__((nonnull, warn_unused_result))

2086

error_t bring_up_interface(const char *const interface,

2087

const float delay){

2088

error_t old_errno = errno;

2089

int ret;

2090

struct ifreq network;

2091

unsigned int if_index = if_nametoindex(interface);

2092

if(if_index == 0){

2093

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

2094

errno = old_errno;

2095

return ENXIO;

2096

}

2097

2098

if(quit_now){

2099

errno = old_errno;

2100

return EINTR;

2101

}

2102

2103

if(not interface_is_up(interface)){

2104

error_t ret_errno = 0, ioctl_errno = 0;

2105

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

2106

ret_errno = errno;

2107

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

2108

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

2109

errno = old_errno;

2110

return ret_errno;

2111

}

2112

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

2113

2114

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

2115

if(sd == -1){

2116

ret_errno = errno;

2117

perror_plus("socket");

2118

errno = old_errno;

2119

return ret_errno;

2120

}

2121

2122

if(quit_now){

2123

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

2124

if(ret == -1){

2125

perror_plus("close");

2126

}

2127

errno = old_errno;

2128

return EINTR;

2129

}

2130

2131

if(debug){

2132

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

2133

interface);

2134

}

2135

2136

/* Raise privileges */

2137

ret_errno = raise_privileges();

2138

if(ret_errno != 0){

2139

errno = ret_errno;

2140

perror_plus("Failed to raise privileges");

2141

}

2142

2143

#ifdef __linux__

2144

int ret_linux;

2145

bool restore_loglevel = false;

2146

if(ret_errno == 0){

2147

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2148

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

2149

ret_linux = klogctl(8, NULL, 5);

2150

if(ret_linux == -1){

2151

perror_plus("klogctl");

2152

} else {

2153

restore_loglevel = true;

2154

}

2155

}

2156

#endif /* __linux__ */

2157

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

2158

ioctl_errno = errno;

2159

#ifdef __linux__

2160

if(restore_loglevel){

2161

ret_linux = klogctl(7, NULL, 0);

2162

if(ret_linux == -1){

2163

perror_plus("klogctl");

2164

}

2165

}

2166

#endif /* __linux__ */

2167

2168

/* If raise_privileges() succeeded above */

2169

if(ret_errno == 0){

2170

/* Lower privileges */

2171

ret_errno = lower_privileges();

2172

if(ret_errno != 0){

2173

errno = ret_errno;

2174

perror_plus("Failed to lower privileges");

2175

}

2176

}

2177

2178

/* Close the socket */

2179

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

2180

if(ret == -1){

2181

perror_plus("close");

2182

}

2183

2184

if(ret_setflags == -1){

2185

errno = ioctl_errno;

2186

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2187

errno = old_errno;

2188

return ioctl_errno;

2189

}

2190

} else if(debug){

2191

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

2192

interface);

2193

}

2194

2195

/* Sleep checking until interface is running.

2196

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

2197

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

2198

if(interface_is_running(interface)){

2199

break;

2200

}

2201

struct timespec sleeptime = { .tv_nsec = 250000000 };

2202

ret = nanosleep(&sleeptime, NULL);

2203

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

2204

perror_plus("nanosleep");

2205

}

2206

}

2207

2208

errno = old_errno;

2209

return 0;

2210

}

2211

2212

__attribute__((nonnull, warn_unused_result))

2213

error_t take_down_interface(const char *const interface){

2214

error_t old_errno = errno;

2215

struct ifreq network;

2216

unsigned int if_index = if_nametoindex(interface);

2217

if(if_index == 0){

2218

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

2219

errno = old_errno;

2220

return ENXIO;

2221

}

2222

if(interface_is_up(interface)){

2223

error_t ret_errno = 0, ioctl_errno = 0;

2224

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

2225

ret_errno = errno;

2226

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

2227

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

2228

errno = old_errno;

2229

return ret_errno;

2230

}

2231

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

2232

2233

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

2234

if(sd == -1){

2235

ret_errno = errno;

2236

perror_plus("socket");

2237

errno = old_errno;

2238

return ret_errno;

2239

}

2240

2241

if(debug){

2242

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

2243

interface);

2244

}

2245

2246

/* Raise privileges */

2247

ret_errno = raise_privileges();

2248

if(ret_errno != 0){

2249

errno = ret_errno;

2250

perror_plus("Failed to raise privileges");

2251

}

2252

2253

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

2254

ioctl_errno = errno;

2255

2256

/* If raise_privileges() succeeded above */

2257

if(ret_errno == 0){

2258

/* Lower privileges */

2259

ret_errno = lower_privileges();

2260

if(ret_errno != 0){

2261

errno = ret_errno;

2262

perror_plus("Failed to lower privileges");

2263

}

2264

}

2265

2266

/* Close the socket */

2267

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

2268

if(ret == -1){

2269

perror_plus("close");

2270

}

2271

2272

if(ret_setflags == -1){

2273

errno = ioctl_errno;

2274

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2275

errno = old_errno;

2276

return ioctl_errno;

2277

}

2278

} else if(debug){

2279

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

2280

interface);

2281

}

2282

2283

errno = old_errno;

2284

return 0;

2285

}

2286

2287

1144

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

2288

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

2289

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

2290

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

2291

.interfaces = NULL, .interfaces_size = 0 };

2292

1145

AvahiSServiceBrowser *sb = NULL;

2293

error_t ret_errno;

1146

int error;

2294

1147

int ret;

2295

1148

intmax_t tmpmax;

2296

1149

char *tmp;

2297

1150

int exitcode = EXIT_SUCCESS;

2298

char *interfaces_to_take_down = NULL;

2299

size_t interfaces_to_take_down_size = 0;

2300

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

2301

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

2302

char *tempdir = NULL;

1151

const char *interface = "";

1152

struct ifreq network;

1153

int sd = -1;

1154

bool take_down_interface = false;

1155

uid_t uid;

1156

gid_t gid;

1157

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

1158

bool tempdir_created = false;

2303

1159

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2304

1160

const char *seckey = PATHDIR "/" SECKEY;

2305

1161

const char *pubkey = PATHDIR "/" PUBKEY;

2306

const char *dh_params_file = NULL;

2307

char *interfaces_hooks = NULL;

2308

1162

2309

1163

bool gnutls_initialized = false;

2310

1164

bool gpgme_initialized = false;

2311

1165

float delay = 2.5f;

2312

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

2313

retrying the same server again */

2314

1166

2315

1167

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

2316

1168

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

2322

1174

errno = 0;

2323

1175

ret = setgid(gid);

2324

1176

if(ret == -1){

2325

perror_plus("setgid");

1177

perror("setgid");

2326

1178

}

2327

1179

2328

1180

/* Lower user privileges (temporarily) */

2329

1181

errno = 0;

2330

1182

ret = seteuid(uid);

2331

1183

if(ret == -1){

2332

perror_plus("seteuid");

1184

perror("seteuid");

2333

1185

}

2334

1186

2335

1187

if(quit_now){

2362

1214

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

2363

1215

" Diffie-Hellman key exchange",

2364

1216

.group = 2 },

2365

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

2366

.arg = "FILE",

2367

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

2368

" for the Diffie-Hellman key exchange",

2369

.group = 2 },

2370

1217

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

2371

1218

.arg = "STRING",

2372

1219

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

2375

1222

.arg = "SECONDS",

2376

1223

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

2377

1224

.group = 2 },

2378

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

2379

.arg = "SECONDS",

2380

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

2381

.group = 2 },

2382

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

2383

.arg = "DIR",

2384

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

2385

.group = 2 },

2386

1225

/*

2387

1226

* These reproduce what we would get without ARGP_NO_HELP

2388

1227

*/

2406

1245

connect_to = arg;

2407

1246

break;

2408

1247

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

2409

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

2410

arg, (int)',');

2411

if(ret_errno != 0){

2412

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

2413

}

1248

interface = arg;

2414

1249

break;

2415

1250

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

2416

1251

seckey = arg;

2427

1262

}

2428

1263

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

2429

1264

break;

2430

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

2431

dh_params_file = arg;

2432

break;

2433

1265

case 130: /* --priority */

2434

1266

mc.priority = arg;

2435

1267

break;

2439

1271

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

2440

1272

argp_error(state, "Bad delay");

2441

1273

}

2442

case 132: /* --retry */

2443

errno = 0;

2444

retry_interval = strtod(arg, &tmp);

2445

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

2446

or (retry_interval * 1000) > INT_MAX

2447

or retry_interval < 0){

2448

argp_error(state, "Bad retry interval");

2449

}

2450

break;

2451

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

2452

hookdir = arg;

2453

1274

break;

2454

1275

/*

2455

1276

* These reproduce what we would get without ARGP_NO_HELP

2462

1283

argp_state_help(state, state->out_stream,

2463

1284

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2464

1285

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

2465

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

1286

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

2466

1287

exit(argp_err_exit_status);

2467

1288

break;

2468

1289

default:

2483

1304

case ENOMEM:

2484

1305

default:

2485

1306

errno = ret;

2486

perror_plus("argp_parse");

1307

perror("argp_parse");

2487

1308

exitcode = EX_OSERR;

2488

1309

goto end;

2489

1310

case EINVAL:

2492

1313

}

2493

1314

}

2494

1315

2495

{

2496

/* Work around Debian bug #633582:

2497

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

2498

2499

/* Re-raise privileges */

2500

ret_errno = raise_privileges();

2501

if(ret_errno != 0){

2502

errno = ret_errno;

2503

perror_plus("Failed to raise privileges");

2504

} else {

2505

struct stat st;

2506

2507

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

2508

int seckey_fd = open(seckey, O_RDONLY);

2509

if(seckey_fd == -1){

2510

perror_plus("open");

2511

} else {

2512

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

2513

if(ret == -1){

2514

perror_plus("fstat");

2515

} else {

2516

if(S_ISREG(st.st_mode)

2517

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

2518

ret = fchown(seckey_fd, uid, gid);

2519

if(ret == -1){

2520

perror_plus("fchown");

2521

}

2522

}

2523

}

2524

TEMP_FAILURE_RETRY(close(seckey_fd));

2525

}

2526

}

2527

2528

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

2529

int pubkey_fd = open(pubkey, O_RDONLY);

2530

if(pubkey_fd == -1){

2531

perror_plus("open");

2532

} else {

2533

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

2534

if(ret == -1){

2535

perror_plus("fstat");

2536

} else {

2537

if(S_ISREG(st.st_mode)

2538

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

2539

ret = fchown(pubkey_fd, uid, gid);

2540

if(ret == -1){

2541

perror_plus("fchown");

2542

}

2543

}

2544

}

2545

TEMP_FAILURE_RETRY(close(pubkey_fd));

2546

}

2547

}

2548

2549

/* Lower privileges */

2550

ret_errno = lower_privileges();

2551

if(ret_errno != 0){

2552

errno = ret_errno;

2553

perror_plus("Failed to lower privileges");

2554

}

2555

}

2556

}

2557

2558

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

2559

{

2560

char *interface = NULL;

2561

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

2562

interface))){

2563

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

2564

and if_nametoindex(interface) == 0){

2565

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

2566

fprintf_plus(stderr, "Not using nonexisting interface"

2567

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

2568

}

2569

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

2570

interface = NULL;

2571

}

2572

}

2573

}

2574

2575

/* Run network hooks */

2576

{

2577

if(mc.interfaces != NULL){

2578

interfaces_hooks = malloc(mc.interfaces_size);

2579

if(interfaces_hooks == NULL){

2580

perror_plus("malloc");

2581

goto end;

2582

}

2583

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

2584

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

2585

}

2586

run_network_hooks("start", interfaces_hooks != NULL ?

2587

interfaces_hooks : "", delay);

2588

}

2589

2590

1316

if(not debug){

2591

1317

avahi_set_log_function(empty_log);

2592

1318

}

1319

1320

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

1321

struct dirent **direntries;

1322

ret = scandir(sys_class_net, &direntries, good_interface,

1323

alphasort);

1324

if(ret >= 1){

1325

/* Pick the first good interface */

1326

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

1327

if(debug){

1328

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

1329

}

1330

if(interface == NULL){

1331

perror("malloc");

1332

free(direntries);

1333

exitcode = EXIT_FAILURE;

1334

goto end;

1335

}

1336

free(direntries);

1337

} else {

1338

free(direntries);

1339

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

1340

exitcode = EXIT_FAILURE;

1341

goto end;

1342

}

1343

}

2593

1344

2594

1345

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

2595

1346

from the signal handler */

2596

1347

/* Initialize the pseudo-RNG for Avahi */

2597

1348

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

2598

simple_poll = avahi_simple_poll_new();

2599

if(simple_poll == NULL){

2600

fprintf_plus(stderr,

2601

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

1349

mc.simple_poll = avahi_simple_poll_new();

1350

if(mc.simple_poll == NULL){

1351

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

2602

1352

exitcode = EX_UNAVAILABLE;

2603

1353

goto end;

2604

1354

}

2606

1356

sigemptyset(&sigterm_action.sa_mask);

2607

1357

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

2608

1358

if(ret == -1){

2609

perror_plus("sigaddset");

1359

perror("sigaddset");

2610

1360

exitcode = EX_OSERR;

2611

1361

goto end;

2612

1362

}

2613

1363

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

2614

1364

if(ret == -1){

2615

perror_plus("sigaddset");

1365

perror("sigaddset");

2616

1366

exitcode = EX_OSERR;

2617

1367

goto end;

2618

1368

}

2619

1369

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

2620

1370

if(ret == -1){

2621

perror_plus("sigaddset");

1371

perror("sigaddset");

2622

1372

exitcode = EX_OSERR;

2623

1373

goto end;

2624

1374

}

2628

1378

*/

2629

1379

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

2630

1380

if(ret == -1){

2631

perror_plus("sigaction");

1381

perror("sigaction");

2632

1382

return EX_OSERR;

2633

1383

}

2634

1384

if(old_sigterm_action.sa_handler != SIG_IGN){

2635

1385

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

2636

1386

if(ret == -1){

2637

perror_plus("sigaction");

1387

perror("sigaction");

2638

1388

exitcode = EX_OSERR;

2639

1389

goto end;

2640

1390

}

2641

1391

}

2642

1392

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

2643

1393

if(ret == -1){

2644

perror_plus("sigaction");

1394

perror("sigaction");

2645

1395

return EX_OSERR;

2646

1396

}

2647

1397

if(old_sigterm_action.sa_handler != SIG_IGN){

2648

1398

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

2649

1399

if(ret == -1){

2650

perror_plus("sigaction");

1400

perror("sigaction");

2651

1401

exitcode = EX_OSERR;

2652

1402

goto end;

2653

1403

}

2654

1404

}

2655

1405

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

2656

1406

if(ret == -1){

2657

perror_plus("sigaction");

1407

perror("sigaction");

2658

1408

return EX_OSERR;

2659

1409

}

2660

1410

if(old_sigterm_action.sa_handler != SIG_IGN){

2661

1411

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

2662

1412

if(ret == -1){

2663

perror_plus("sigaction");

1413

perror("sigaction");

2664

1414

exitcode = EX_OSERR;

2665

1415

goto end;

2666

1416

}

2667

1417

}

2668

1418

2669

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

2670

if(mc.interfaces == NULL){

2671

struct dirent **direntries = NULL;

2672

/* Look for any good interfaces */

2673

ret = scandir(sys_class_net, &direntries, good_interface,

2674

alphasort);

2675

if(ret >= 1){

2676

/* Add all found interfaces to interfaces list */

2677

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

2678

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

2679

direntries[i]->d_name);

2680

if(ret_errno != 0){

2681

errno = ret_errno;

2682

perror_plus("argz_add");

2683

free(direntries[i]);

2684

continue;

2685

}

2686

if(debug){

2687

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

2688

direntries[i]->d_name);

2689

}

2690

free(direntries[i]);

2691

}

2692

free(direntries);

1419

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

1420

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

1421

if_index = (AvahiIfIndex) if_nametoindex(interface);

1422

if(if_index == 0){

1423

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

1424

exitcode = EX_UNAVAILABLE;

1425

goto end;

1426

}

1427

1428

if(quit_now){

1429

goto end;

1430

}

1431

1432

/* Re-raise priviliges */

1433

errno = 0;

1434

ret = seteuid(0);

1435

if(ret == -1){

1436

perror("seteuid");

1437

}

1438

1439

#ifdef __linux__

1440

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1441

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

1442

ret = klogctl(8, NULL, 5);

1443

bool restore_loglevel = true;

1444

if(ret == -1){

1445

restore_loglevel = false;

1446

perror("klogctl");

1447

}

1448

#endif /* __linux__ */

1449

1450

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1451

if(sd < 0){

1452

perror("socket");

1453

exitcode = EX_OSERR;

1454

#ifdef __linux__

1455

if(restore_loglevel){

1456

ret = klogctl(7, NULL, 0);

1457

if(ret == -1){

1458

perror("klogctl");

1459

}

1460

}

1461

#endif /* __linux__ */

1462

/* Lower privileges */

1463

errno = 0;

1464

ret = seteuid(uid);

1465

if(ret == -1){

1466

perror("seteuid");

1467

}

1468

goto end;

1469

}

1470

strcpy(network.ifr_name, interface);

1471

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

1472

if(ret == -1){

1473

perror("ioctl SIOCGIFFLAGS");

1474

#ifdef __linux__

1475

if(restore_loglevel){

1476

ret = klogctl(7, NULL, 0);

1477

if(ret == -1){

1478

perror("klogctl");

1479

}

1480

}

1481

#endif /* __linux__ */

1482

exitcode = EX_OSERR;

1483

/* Lower privileges */

1484

errno = 0;

1485

ret = seteuid(uid);

1486

if(ret == -1){

1487

perror("seteuid");

1488

}

1489

goto end;

1490

}

1491

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

1492

network.ifr_flags |= IFF_UP;

1493

take_down_interface = true;

1494

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

1495

if(ret == -1){

1496

take_down_interface = false;

1497

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1498

exitcode = EX_OSERR;

1499

#ifdef __linux__

1500

if(restore_loglevel){

1501

ret = klogctl(7, NULL, 0);

1502

if(ret == -1){

1503

perror("klogctl");

1504

}

1505

}

1506

#endif /* __linux__ */

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror("seteuid");

1512

}

1513

goto end;

1514

}

1515

}

1516

/* sleep checking until interface is running */

1517

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

1518

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

1519

if(ret == -1){

1520

perror("ioctl SIOCGIFFLAGS");

1521

} else if(network.ifr_flags & IFF_RUNNING){

1522

break;

1523

}

1524

struct timespec sleeptime = { .tv_nsec = 250000000 };

1525

ret = nanosleep(&sleeptime, NULL);

1526

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

1527

perror("nanosleep");

1528

}

1529

}

1530

if(not take_down_interface){

1531

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

1532

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

1533

if(ret == -1){

1534

perror("close");

1535

}

1536

}

1537

#ifdef __linux__

1538

if(restore_loglevel){

1539

/* Restores kernel loglevel to default */

1540

ret = klogctl(7, NULL, 0);

1541

if(ret == -1){

1542

perror("klogctl");

1543

}

1544

}

1545

#endif /* __linux__ */

1546

/* Lower privileges */

1547

errno = 0;

1548

if(take_down_interface){

1549

/* Lower privileges */

1550

ret = seteuid(uid);

1551

if(ret == -1){

1552

perror("seteuid");

1553

}

2693

1554

} else {

2694

if(ret == 0){

2695

free(direntries);

2696

}

2697

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

2698

exitcode = EXIT_FAILURE;

2699

goto end;

2700

}

2701

}

2702

2703

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

2704

{

2705

char *interface = NULL;

2706

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

2707

interface))){

2708

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

2709

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

2710

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

2711

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

2712

interface);

2713

interface = NULL;

2714

while((interface = argz_next(mc.interfaces,

2715

mc.interfaces_size, interface))){

2716

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

2717

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

2718

interface);

2719

interface = NULL;

2720

}

2721

}

2722

break;

2723

}

2724

bool interface_was_up = interface_is_up(interface);

2725

errno = bring_up_interface(interface, delay);

2726

if(not interface_was_up){

2727

if(errno != 0){

2728

perror_plus("Failed to bring up interface");

2729

} else {

2730

errno = argz_add(&interfaces_to_take_down,

2731

&interfaces_to_take_down_size,

2732

interface);

2733

if(errno != 0){

2734

perror_plus("argz_add");

2735

}

2736

}

2737

}

2738

}

2739

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

2740

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

2741

}

2742

}

2743

2744

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

2745

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

2746

if(debug){

2747

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

2748

mc.interfaces);

2749

}

2750

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

1555

/* Lower privileges permanently */

1556

ret = setuid(uid);

1557

if(ret == -1){

1558

perror("setuid");

1559

}

1560

}

2751

1561

}

2752

1562

2753

1563

if(quit_now){

2754

1564

goto end;

2755

1565

}

2756

1566

2757

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

1567

ret = init_gnutls_global(pubkey, seckey);

2758

1568

if(ret == -1){

2759

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

1569

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

2760

1570

exitcode = EX_UNAVAILABLE;

2761

1571

goto end;

2762

1572

} else {

2767

1577

goto end;

2768

1578

}

2769

1579

2770

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

2771

tempdir = mkdtemp(run_tempdir);

2772

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

2773

if(debug){

2774

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

2775

run_tempdir, old_tempdir);

2776

}

2777

tempdir = mkdtemp(old_tempdir);

2778

}

2779

if(tempdir == NULL){

2780

perror_plus("mkdtemp");

1580

if(mkdtemp(tempdir) == NULL){

1581

perror("mkdtemp");

2781

1582

goto end;

2782

1583

}

1584

tempdir_created = true;

2783

1585

2784

1586

if(quit_now){

2785

1587

goto end;

2786

1588

}

2787

1589

2788

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

2789

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

1590

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

1591

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

2790

1592

exitcode = EX_UNAVAILABLE;

2791

1593

goto end;

2792

1594

} else {

2801

1603

/* Connect directly, do not use Zeroconf */

2802

1604

/* (Mainly meant for debugging) */

2803

1605

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

2804

2805

1606

if(address == NULL){

2806

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

1607

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

2807

1608

exitcode = EX_USAGE;

2808

1609

goto end;

2809

1610

}

2812

1613

goto end;

2813

1614

}

2814

1615

2815

in_port_t port;

1616

uint16_t port;

2816

1617

errno = 0;

2817

1618

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

2818

1619

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

2819

or tmpmax != (in_port_t)tmpmax){

2820

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

1620

or tmpmax != (uint16_t)tmpmax){

1621

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

2821

1622

exitcode = EX_USAGE;

2822

1623

goto end;

2823

1624

}

2824

1625

2825

1626

if(quit_now){

2826

1627

goto end;

2827

1628

}

2828

1629

2829

port = (in_port_t)tmpmax;

1630

port = (uint16_t)tmpmax;

2830

1631

*address = '\0';

1632

address = connect_to;

2831

1633

/* Colon in address indicates IPv6 */

2832

1634

int af;

2833

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

1635

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

2834

1636

af = AF_INET6;

2835

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

2836

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

2837

{

2838

connect_to++;

2839

address[-1] = '\0';

2840

}

2841

1637

} else {

2842

1638

af = AF_INET;

2843

1639

}

2844

address = connect_to;

2845

1640

2846

1641

if(quit_now){

2847

1642

goto end;

2848

1643

}

2849

1644

2850

1645

while(not quit_now){

2851

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

2852

&mc);

1646

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

2853

1647

if(quit_now or ret == 0){

2854

1648

break;

2855

1649

}

2856

if(debug){

2857

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

2858

(int)retry_interval);

2859

}

2860

sleep((unsigned int)retry_interval);

2861

}

2862

2863

if(not quit_now){

1650

sleep(15);

1651

};

1652

1653

if (not quit_now){

2864

1654

exitcode = EXIT_SUCCESS;

2865

1655

}

2866

1656

2867

1657

goto end;

2868

1658

}

2869

1659

2881

1671

config.publish_domain = 0;

2882

1672

2883

1673

/* Allocate a new server */

2884

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2885

&config, NULL, NULL, &ret_errno);

1674

mc.server = avahi_server_new(avahi_simple_poll_get

1675

(mc.simple_poll), &config, NULL,

1676

NULL, &error);

2886

1677

2887

1678

/* Free the Avahi configuration data */

2888

1679

avahi_server_config_free(&config);

2890

1681

2891

1682

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

2892

1683

if(mc.server == NULL){

2893

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

2894

avahi_strerror(ret_errno));

1684

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

1685

avahi_strerror(error));

2895

1686

exitcode = EX_UNAVAILABLE;

2896

1687

goto end;

2897

1688

}

2903

1694

/* Create the Avahi service browser */

2904

1695

sb = avahi_s_service_browser_new(mc.server, if_index,

2905

1696

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2906

NULL, 0, browse_callback,

2907

(void *)&mc);

1697

NULL, 0, browse_callback, NULL);

2908

1698

if(sb == NULL){

2909

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

2910

avahi_strerror(avahi_server_errno(mc.server)));

1699

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

1700

avahi_strerror(avahi_server_errno(mc.server)));

2911

1701

exitcode = EX_UNAVAILABLE;

2912

1702

goto end;

2913

1703

}

2919

1709

/* Run the main loop */

2920

1710

2921

1711

if(debug){

2922

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

1712

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

2923

1713

}

2924

1714

2925

ret = avahi_loop_with_timeout(simple_poll,

2926

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

2927

if(debug){

2928

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

2929

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

2930

}

1715

avahi_simple_poll_loop(mc.simple_poll);

2931

1716

2932

1717

end:

2933

1718

2934

1719

if(debug){

2935

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

1720

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

2936

1721

}

2937

1722

2938

1723

/* Cleanup things */

2939

free(mc.interfaces);

2940

2941

1724

if(sb != NULL)

2942

1725

avahi_s_service_browser_free(sb);

2943

1726

2944

1727

if(mc.server != NULL)

2945

1728

avahi_server_free(mc.server);

2946

1729

2947

if(simple_poll != NULL)

2948

avahi_simple_poll_free(simple_poll);

1730

if(mc.simple_poll != NULL)

1731

avahi_simple_poll_free(mc.simple_poll);

2949

1732

2950

1733

if(gnutls_initialized){

2951

1734

gnutls_certificate_free_credentials(mc.cred);

2957

1740

gpgme_release(mc.ctx);

2958

1741

}

2959

1742

2960

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

2961

has seen */

2962

if(mc.current_server != NULL){

2963

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

2964

while(mc.current_server != NULL){

2965

server *next = mc.current_server->next;

2966

#ifdef __GNUC__

2967

#pragma GCC diagnostic push

2968

#pragma GCC diagnostic ignored "-Wcast-qual"

2969

#endif

2970

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

2971

#ifdef __GNUC__

2972

#pragma GCC diagnostic pop

2973

#endif

2974

free(mc.current_server);

2975

mc.current_server = next;

2976

}

2977

}

2978

2979

/* Re-raise privileges */

2980

{

2981

ret_errno = raise_privileges();

2982

if(ret_errno != 0){

2983

errno = ret_errno;

2984

perror_plus("Failed to raise privileges");

2985

} else {

2986

2987

/* Run network hooks */

2988

run_network_hooks("stop", interfaces_hooks != NULL ?

2989

interfaces_hooks : "", delay);

2990

2991

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

2992

{

2993

char *interface = NULL;

2994

while((interface=argz_next(interfaces_to_take_down,

2995

interfaces_to_take_down_size,

2996

interface))){

2997

ret_errno = take_down_interface(interface);

2998

if(ret_errno != 0){

2999

errno = ret_errno;

3000

perror_plus("Failed to take down interface");

3001

}

3002

}

3003

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

3004

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

3005

" down\n");

3006

}

3007

}

3008

}

3009

3010

ret_errno = lower_privileges_permanently();

3011

if(ret_errno != 0){

3012

errno = ret_errno;

3013

perror_plus("Failed to lower privileges permanently");

3014

}

3015

}

3016

3017

free(interfaces_to_take_down);

3018

free(interfaces_hooks);

1743

/* Take down the network interface */

1744

if(take_down_interface){

1745

/* Re-raise priviliges */

1746

errno = 0;

1747

ret = seteuid(0);

1748

if(ret == -1){

1749

perror("seteuid");

1750

}

1751

if(geteuid() == 0){

1752

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

1753

if(ret == -1){

1754

perror("ioctl SIOCGIFFLAGS");

1755

} else if(network.ifr_flags & IFF_UP) {

1756

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

1757

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

1758

if(ret == -1){

1759

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1760

}

1761

}

1762

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

1763

if(ret == -1){

1764

perror("close");

1765

}

1766

/* Lower privileges permanently */

1767

errno = 0;

1768

ret = setuid(uid);

1769

if(ret == -1){

1770

perror("setuid");

1771

}

1772

}

1773

}

3019

1774

3020

1775

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

3021

if(tempdir != NULL){

1776

if(tempdir_created){

3022

1777

struct dirent **direntries = NULL;

3023

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY

3024

| O_NOFOLLOW

3025

| O_DIRECTORY

3026

| O_PATH));

3027

if(tempdir_fd == -1){

3028

perror_plus("open");

3029

} else {

3030

#ifdef __GLIBC__

3031

#if __GLIBC_PREREQ(2, 15)

3032

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

3033

notdotentries, alphasort);

3034

#else /* not __GLIBC_PREREQ(2, 15) */

3035

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

3036

alphasort);

3037

#endif /* not __GLIBC_PREREQ(2, 15) */

3038

#else /* not __GLIBC__ */

3039

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

3040

alphasort);

3041

#endif /* not __GLIBC__ */

3042

if(numentries >= 0){

3043

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

3044

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

3045

if(ret == -1){

3046

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

3047

" \"%s\", 0): %s\n", tempdir,

3048

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

3049

}

3050

free(direntries[i]);

3051

}

3052

3053

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

3054

free(direntries);

3055

if(numentries == -1){

3056

perror_plus("scandir");

3057

}

3058

ret = rmdir(tempdir);

3059

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

3060

perror_plus("rmdir");

3061

}

1778

struct dirent *direntry = NULL;

1779

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1780

if (ret > 0){

1781

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

1782

direntry = direntries[i];

1783

char *fullname = NULL;

1784

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

1785

direntry->d_name);

1786

if(ret < 0){

1787

perror("asprintf");

1788

continue;

1789

}

1790

ret = remove(fullname);

1791

if(ret == -1){

1792

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

1793

strerror(errno));

1794

}

1795

free(fullname);

3062

1796

}

3063

TEMP_FAILURE_RETRY(close(tempdir_fd));

1797

}

1798

1799

/* need to be cleaned even if ret == 0 because man page dont specify */

1800

free(direntries);

1801

if (ret == -1){

1802

perror("scandir");

1803

}

1804

ret = rmdir(tempdir);

1805

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

1806

perror("rmdir");

3064

1807

}

3065

1808

}

3066

1809

3071

1814

&old_sigterm_action,

3072

1815

NULL));

3073

1816

if(ret == -1){

3074

perror_plus("sigaction");

1817

perror("sigaction");

3075

1818

}

3076

1819

do {

3077

1820

ret = raise(signal_received);

3078

1821

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

3079

1822

if(ret != 0){

3080

perror_plus("raise");

1823

perror("raise");

3081

1824

abort();

3082

1825

}

3083

1826

TEMP_FAILURE_RETRY(pause());