/mandos/release : revision 237.2.74

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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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33

#define _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

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

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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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#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,

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srand(), strtof() */

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#include <stdbool.h> /* bool, false, true */

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#include <string.h> /* memset(), strcmp(), strlen(),

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strerror(), asprintf(), strcpy() */

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

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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INET_ADDRSTRLEN, INET6_ADDRSTRLEN

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*/

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

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

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

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

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getuid(), getgid(), setuid(),

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setgid() */

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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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74

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

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argp_state, struct argp,

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argp_parse(), ARGP_KEY_ARG,

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ARGP_KEY_END, ARGP_ERR_UNKNOWN */

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#include <signal.h> /* sigemptyset(), sigaddset(),

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sigaction(), SIGTERM, sig_atomic_t,

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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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sigaction(), SIGTERM, sigaction,

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sig_atomic_t */

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#ifdef __linux__

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83

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

111

101

init_gnutls_session(),

112

102

GNUTLS_* */

113

103

#include <gnutls/openpgp.h>

114

/* 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 */

116

106

117

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/* GPGME */

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108

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

126

116

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

127

117

#define SECKEY "seckey.txt"

128

118

#define PUBKEY "pubkey.txt"

129

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

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119

131

120

bool debug = false;

132

121

static const char mandos_protocol_version[] = "1";

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122

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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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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139

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

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typedef struct server{

141

const char *ip;

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uint16_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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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

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124

150

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

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126

typedef struct {

156

131

gnutls_dh_params_t dh_params;

157

132

const char *priority;

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133

gpgme_ctx_t ctx;

159

server *current_server;

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134

} mandos_context;

161

135

162

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

163

137

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

164

138

.dh_bits = 1024, .priority = "SECURE256"

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

166

.current_server = NULL };

167

168

sig_atomic_t quit_now = 0;

169

int signal_received = 0;

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171

/* Function to use when printing errors */

172

void perror_plus(const char *print_text){

173

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

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program_invocation_short_name);

175

perror(print_text);

176

}

177

178

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

179

va_list ap;

180

va_start (ap, format);

181

182

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

183

program_invocation_short_name));

184

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

185

}

139

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

186

140

187

141

/*

188

142

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

190

144

* "buffer_length" is how much is already used.

191

145

*/

192

146

size_t incbuffer(char **buffer, size_t buffer_length,

193

size_t buffer_capacity){

147

size_t buffer_capacity){

194

148

if(buffer_length + BUFFER_SIZE > buffer_capacity){

195

149

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

196

150

if(buffer == NULL){

201

155

return buffer_capacity;

202

156

}

203

157

204

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

205

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

206

int af){

207

int ret;

208

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

209

if(new_server == NULL){

210

perror_plus("malloc");

211

return false;

212

}

213

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

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.port = port,

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.if_index = if_index,

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.af = af };

217

if(new_server->ip == NULL){

218

perror_plus("strdup");

219

return false;

220

}

221

/* Special case of first server */

222

if (mc.current_server == NULL){

223

new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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

227

} else {

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new_server->next = mc.current_server;

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

230

new_server->prev->next = new_server;

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mc.current_server->prev = new_server;

232

}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return false;

237

}

238

return true;

239

}

240

241

158

/*

242

159

* Initialize GPGME.

243

160

*/

244

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

245

const char *tempdir){

161

static bool init_gpgme(const char *seckey,

162

const char *pubkey, const char *tempdir){

163

int ret;

246

164

gpgme_error_t rc;

247

165

gpgme_engine_info_t engine_info;

248

166

251

169

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

252

170

*/

253

171

bool import_key(const char *filename){

254

int ret;

255

172

int fd;

256

173

gpgme_data_t pgp_data;

257

174

258

175

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

259

176

if(fd == -1){

260

perror_plus("open");

177

perror("open");

261

178

return false;

262

179

}

263

180

264

181

rc = gpgme_data_new_from_fd(&pgp_data, fd);

265

182

if(rc != GPG_ERR_NO_ERROR){

266

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

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gpgme_strsource(rc), gpgme_strerror(rc));

183

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

184

gpgme_strsource(rc), gpgme_strerror(rc));

268

185

return false;

269

186

}

270

187

271

188

rc = gpgme_op_import(mc.ctx, pgp_data);

272

189

if(rc != GPG_ERR_NO_ERROR){

273

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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192

return false;

276

193

}

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194

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

279

196

if(ret == -1){

280

perror_plus("close");

197

perror("close");

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198

}

282

199

gpgme_data_release(pgp_data);

283

200

return true;

284

201

}

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202

286

203

if(debug){

287

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

204

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

288

205

}

289

206

290

207

/* Init GPGME */

291

208

gpgme_check_version(NULL);

292

209

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

293

210

if(rc != GPG_ERR_NO_ERROR){

294

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

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gpgme_strsource(rc), gpgme_strerror(rc));

211

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

212

gpgme_strsource(rc), gpgme_strerror(rc));

296

213

return false;

297

214

}

298

215

299

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

216

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

300

217

rc = gpgme_get_engine_info(&engine_info);

301

218

if(rc != GPG_ERR_NO_ERROR){

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

219

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

220

gpgme_strsource(rc), gpgme_strerror(rc));

304

221

return false;

305

222

}

306

223

while(engine_info != NULL){

312

229

engine_info = engine_info->next;

313

230

}

314

231

if(engine_info == NULL){

315

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

316

tempdir);

232

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

317

233

return false;

318

234

}

319

235

320

236

/* Create new GPGME "context" */

321

237

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

322

238

if(rc != GPG_ERR_NO_ERROR){

323

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

324

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

325

gpgme_strerror(rc));

239

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

240

gpgme_strsource(rc), gpgme_strerror(rc));

326

241

return false;

327

242

}

328

243

330

245

return false;

331

246

}

332

247

333

return true;

248

return true;

334

249

}

335

250

336

251

/*

347

262

ssize_t plaintext_length = 0;

348

263

349

264

if(debug){

350

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

265

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

351

266

}

352

267

353

268

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

354

269

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

355

270

0);

356

271

if(rc != GPG_ERR_NO_ERROR){

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

359

274

return -1;

360

275

}

361

276

362

277

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

363

278

rc = gpgme_data_new(&dh_plain);

364

279

if(rc != GPG_ERR_NO_ERROR){

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

368

282

gpgme_data_release(dh_crypto);

369

283

return -1;

370

284

}

373

287

data buffer */

374

288

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

375

289

if(rc != GPG_ERR_NO_ERROR){

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

290

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

291

gpgme_strsource(rc), gpgme_strerror(rc));

378

292

plaintext_length = -1;

379

293

if(debug){

380

294

gpgme_decrypt_result_t result;

381

295

result = gpgme_op_decrypt_result(mc.ctx);

382

296

if(result == NULL){

383

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

297

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

384

298

} else {

385

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

386

result->unsupported_algorithm);

387

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

388

result->wrong_key_usage);

299

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

300

result->unsupported_algorithm);

301

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

302

result->wrong_key_usage);

389

303

if(result->file_name != NULL){

390

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

304

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

391

305

}

392

306

gpgme_recipient_t recipient;

393

307

recipient = result->recipients;

394

while(recipient != NULL){

395

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

396

gpgme_pubkey_algo_name

397

(recipient->pubkey_algo));

398

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

399

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

400

recipient->status == GPG_ERR_NO_SECKEY

401

? "No" : "Yes");

402

recipient = recipient->next;

308

if(recipient){

309

while(recipient != NULL){

310

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

311

gpgme_pubkey_algo_name(recipient->pubkey_algo));

312

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

313

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

314

recipient->status == GPG_ERR_NO_SECKEY

315

? "No" : "Yes");

316

recipient = recipient->next;

317

}

403

318

}

404

319

}

405

320

}

407

322

}

408

323

409

324

if(debug){

410

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

325

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

411

326

}

412

327

413

328

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

414

329

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

415

perror_plus("gpgme_data_seek");

330

perror("gpgme_data_seek");

416

331

plaintext_length = -1;

417

332

goto decrypt_end;

418

333

}

420

335

*plaintext = NULL;

421

336

while(true){

422

337

plaintext_capacity = incbuffer(plaintext,

423

(size_t)plaintext_length,

424

plaintext_capacity);

338

(size_t)plaintext_length,

339

plaintext_capacity);

425

340

if(plaintext_capacity == 0){

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

341

perror("incbuffer");

342

plaintext_length = -1;

343

goto decrypt_end;

429

344

}

430

345

431

346

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

436

351

break;

437

352

}

438

353

if(ret < 0){

439

perror_plus("gpgme_data_read");

354

perror("gpgme_data_read");

440

355

plaintext_length = -1;

441

356

goto decrypt_end;

442

357

}

444

359

}

445

360

446

361

if(debug){

447

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

362

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

448

363

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

449

364

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

450

365

}

472

387

/* GnuTLS log function callback */

473

388

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

474

389

const char* string){

475

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

390

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

476

391

}

477

392

478

393

static int init_gnutls_global(const char *pubkeyfilename,

480

395

int ret;

481

396

482

397

if(debug){

483

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

398

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

484

399

}

485

400

486

401

ret = gnutls_global_init();

487

402

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

403

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

404

safer_gnutls_strerror(ret));

490

405

return -1;

491

406

}

492

407

499

414

}

500

415

501

416

/* OpenPGP credentials */

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

417

gnutls_certificate_allocate_credentials(&mc.cred);

503

418

if(ret != GNUTLS_E_SUCCESS){

504

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

505

safer_gnutls_strerror(ret));

419

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

420

from

421

-Wunreachable-code

422

*/

423

safer_gnutls_strerror(ret));

506

424

gnutls_global_deinit();

507

425

return -1;

508

426

}

509

427

510

428

if(debug){

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

429

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

430

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

431

seckeyfilename);

515

432

}

516

433

517

434

ret = gnutls_certificate_set_openpgp_key_file

518

435

(mc.cred, pubkeyfilename, seckeyfilename,

519

436

GNUTLS_OPENPGP_FMT_BASE64);

520

437

if(ret != GNUTLS_E_SUCCESS){

521

fprintf_plus(stderr,

522

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

523

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

524

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

525

safer_gnutls_strerror(ret));

438

fprintf(stderr,

439

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

440

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

441

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

442

safer_gnutls_strerror(ret));

526

443

goto globalfail;

527

444

}

528

445

529

446

/* GnuTLS server initialization */

530

447

ret = gnutls_dh_params_init(&mc.dh_params);

531

448

if(ret != GNUTLS_E_SUCCESS){

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

449

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

450

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

535

451

goto globalfail;

536

452

}

537

453

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

538

454

if(ret != GNUTLS_E_SUCCESS){

539

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

540

safer_gnutls_strerror(ret));

455

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

456

safer_gnutls_strerror(ret));

541

457

goto globalfail;

542

458

}

543

459

556

472

static int init_gnutls_session(gnutls_session_t *session){

557

473

int ret;

558

474

/* GnuTLS session creation */

559

do {

560

ret = gnutls_init(session, GNUTLS_SERVER);

561

if(quit_now){

562

return -1;

563

}

564

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

475

ret = gnutls_init(session, GNUTLS_SERVER);

565

476

if(ret != GNUTLS_E_SUCCESS){

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

477

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

478

safer_gnutls_strerror(ret));

569

479

}

570

480

571

481

{

572

482

const char *err;

573

do {

574

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

575

if(quit_now){

576

gnutls_deinit(*session);

577

return -1;

578

}

579

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

483

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

580

484

if(ret != GNUTLS_E_SUCCESS){

581

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

582

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

583

safer_gnutls_strerror(ret));

485

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

486

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

487

safer_gnutls_strerror(ret));

584

488

gnutls_deinit(*session);

585

489

return -1;

586

490

}

587

491

}

588

492

589

do {

590

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

591

mc.cred);

592

if(quit_now){

593

gnutls_deinit(*session);

594

return -1;

595

}

596

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

493

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

494

mc.cred);

597

495

if(ret != GNUTLS_E_SUCCESS){

598

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

599

safer_gnutls_strerror(ret));

496

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

497

safer_gnutls_strerror(ret));

600

498

gnutls_deinit(*session);

601

499

return -1;

602

500

}

603

501

604

502

/* ignore client certificate if any. */

605

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

503

gnutls_certificate_server_set_request(*session,

504

GNUTLS_CERT_IGNORE);

606

505

607

506

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

608

507

617

516

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

618

517

AvahiIfIndex if_index,

619

518

int af){

620

int ret, tcp_sd = -1;

519

int ret, tcp_sd;

621

520

ssize_t sret;

622

521

union {

623

522

struct sockaddr_in in;

624

523

struct sockaddr_in6 in6;

625

524

} to;

626

525

char *buffer = NULL;

627

char *decrypted_buffer = NULL;

526

char *decrypted_buffer;

628

527

size_t buffer_length = 0;

629

528

size_t buffer_capacity = 0;

529

ssize_t decrypted_buffer_size;

630

530

size_t written;

631

int retval = -1;

531

int retval = 0;

632

532

gnutls_session_t session;

633

533

int pf; /* Protocol family */

634

534

635

errno = 0;

636

637

if(quit_now){

638

errno = EINTR;

639

return -1;

640

}

641

642

535

switch(af){

643

536

case AF_INET6:

644

537

pf = PF_INET6;

647

540

pf = PF_INET;

648

541

break;

649

542

default:

650

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

651

errno = EINVAL;

543

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

652

544

return -1;

653

545

}

654

546

658

550

}

659

551

660

552

if(debug){

661

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

662

PRIu16 "\n", ip, port);

553

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

554

"\n", ip, port);

663

555

}

664

556

665

557

tcp_sd = socket(pf, SOCK_STREAM, 0);

666

558

if(tcp_sd < 0){

667

int e = errno;

668

perror_plus("socket");

669

errno = e;

670

goto mandos_end;

671

}

672

673

if(quit_now){

674

errno = EINTR;

675

goto mandos_end;

559

perror("socket");

560

return -1;

676

561

}

677

562

678

563

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

679

564

if(af == AF_INET6){

680

to.in6.sin6_family = (sa_family_t)af;

565

to.in6.sin6_family = (uint16_t)af;

681

566

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

682

567

} else { /* IPv4 */

683

568

to.in.sin_family = (sa_family_t)af;

684

569

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

685

570

}

686

571

if(ret < 0 ){

687

int e = errno;

688

perror_plus("inet_pton");

689

errno = e;

690

goto mandos_end;

572

perror("inet_pton");

573

return -1;

691

574

}

692

575

if(ret == 0){

693

int e = errno;

694

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

695

errno = e;

696

goto mandos_end;

576

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

577

return -1;

697

578

}

698

579

if(af == AF_INET6){

699

580

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

702

583

703

584

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

585

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

705

-Wunreachable-code*/

586

-Wunreachable-code*/

706

587

if(if_index == AVAHI_IF_UNSPEC){

707

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

708

" incomplete without a network interface\n");

709

errno = EINVAL;

710

goto mandos_end;

588

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

589

" without a network interface\n");

590

return -1;

711

591

}

712

592

/* Set the network interface number as scope */

713

593

to.in6.sin6_scope_id = (uint32_t)if_index;

718

598

-Wunreachable-code */

719

599

}

720

600

721

if(quit_now){

722

errno = EINTR;

723

goto mandos_end;

724

}

725

726

601

if(debug){

727

602

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

728

603

char interface[IF_NAMESIZE];

729

604

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

730

perror_plus("if_indextoname");

605

perror("if_indextoname");

731

606

} else {

732

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

733

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

607

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

608

ip, interface, port);

734

609

}

735

610

} else {

736

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

737

ip, port);

611

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

612

port);

738

613

}

739

614

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

615

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

747

622

sizeof(addrstr));

748

623

}

749

624

if(pcret == NULL){

750

perror_plus("inet_ntop");

625

perror("inet_ntop");

751

626

} else {

752

627

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

753

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

628

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

754

629

}

755

630

}

756

631

}

757

632

758

if(quit_now){

759

errno = EINTR;

760

goto mandos_end;

761

}

762

763

633

if(af == AF_INET6){

764

634

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

765

635

} else {

766

636

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

767

637

}

768

638

if(ret < 0){

769

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

770

int e = errno;

771

perror_plus("connect");

772

errno = e;

773

}

774

goto mandos_end;

775

}

776

777

if(quit_now){

778

errno = EINTR;

779

goto mandos_end;

639

perror("connect");

640

return -1;

780

641

}

781

642

782

643

const char *out = mandos_protocol_version;

784

645

while(true){

785

646

size_t out_size = strlen(out);

786

647

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

787

out_size - written));

648

out_size - written));

788

649

if(ret == -1){

789

int e = errno;

790

perror_plus("write");

791

errno = e;

650

perror("write");

651

retval = -1;

792

652

goto mandos_end;

793

653

}

794

654

written += (size_t)ret;

802

662

break;

803

663

}

804

664

}

805

806

if(quit_now){

807

errno = EINTR;

808

goto mandos_end;

809

}

810

665

}

811

666

812

667

if(debug){

813

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

814

}

815

816

if(quit_now){

817

errno = EINTR;

818

goto mandos_end;

819

}

820

821

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

668

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

669

}

670

822

671

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

823

672

824

if(quit_now){

825

errno = EINTR;

826

goto mandos_end;

827

}

828

829

do {

673

do{

830

674

ret = gnutls_handshake(session);

831

if(quit_now){

832

errno = EINTR;

833

goto mandos_end;

834

}

835

675

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

836

676

837

677

if(ret != GNUTLS_E_SUCCESS){

838

678

if(debug){

839

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

679

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

840

680

gnutls_perror(ret);

841

681

}

842

errno = EPROTO;

682

retval = -1;

843

683

goto mandos_end;

844

684

}

845

685

846

686

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

847

687

848

688

if(debug){

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

689

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

690

ip);

851

691

}

852

692

853

693

while(true){

854

855

if(quit_now){

856

errno = EINTR;

857

goto mandos_end;

858

}

859

860

694

buffer_capacity = incbuffer(&buffer, buffer_length,

861

buffer_capacity);

695

buffer_capacity);

862

696

if(buffer_capacity == 0){

863

int e = errno;

864

perror_plus("incbuffer");

865

errno = e;

866

goto mandos_end;

867

}

868

869

if(quit_now){

870

errno = EINTR;

697

perror("incbuffer");

698

retval = -1;

871

699

goto mandos_end;

872

700

}

873

701

882

710

case GNUTLS_E_AGAIN:

883

711

break;

884

712

case GNUTLS_E_REHANDSHAKE:

885

do {

713

do{

886

714

ret = gnutls_handshake(session);

887

888

if(quit_now){

889

errno = EINTR;

890

goto mandos_end;

891

}

892

715

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

893

716

if(ret < 0){

894

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

895

"***\n");

717

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

896

718

gnutls_perror(ret);

897

errno = EPROTO;

719

retval = -1;

898

720

goto mandos_end;

899

721

}

900

722

break;

901

723

default:

902

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

903

" encrypted session with Mandos server\n");

724

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

725

" encrypted session with Mandos server\n");

726

retval = -1;

904

727

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

errno = EIO;

906

728

goto mandos_end;

907

729

}

908

730

} else {

911

733

}

912

734

913

735

if(debug){

914

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

915

}

916

917

if(quit_now){

918

errno = EINTR;

919

goto mandos_end;

920

}

921

922

do {

923

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

924

if(quit_now){

925

errno = EINTR;

926

goto mandos_end;

927

}

928

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

736

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

737

}

738

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

929

740

930

741

if(buffer_length > 0){

931

ssize_t decrypted_buffer_size;

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

742

decrypted_buffer_size = pgp_packet_decrypt(buffer,

743

buffer_length,

933

744

&decrypted_buffer);

934

745

if(decrypted_buffer_size >= 0){

935

936

746

written = 0;

937

747

while(written < (size_t) decrypted_buffer_size){

938

if(quit_now){

939

errno = EINTR;

940

goto mandos_end;

941

}

942

943

748

ret = (int)fwrite(decrypted_buffer + written, 1,

944

749

(size_t)decrypted_buffer_size - written,

945

750

stdout);

946

751

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

947

int e = errno;

948

752

if(debug){

949

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

950

strerror(errno));

753

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

754

strerror(errno));

951

755

}

952

errno = e;

953

goto mandos_end;

756

retval = -1;

757

break;

954

758

}

955

759

written += (size_t)ret;

956

760

}

957

retval = 0;

761

free(decrypted_buffer);

762

} else {

763

retval = -1;

958

764

}

765

} else {

766

retval = -1;

959

767

}

960

768

961

769

/* Shutdown procedure */

962

770

963

771

mandos_end:

964

{

965

int e = errno;

966

free(decrypted_buffer);

967

free(buffer);

968

if(tcp_sd >= 0){

969

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

970

}

971

if(ret == -1){

972

if(e == 0){

973

e = errno;

974

}

975

perror_plus("close");

976

}

977

gnutls_deinit(session);

978

errno = e;

979

if(quit_now){

980

errno = EINTR;

981

retval = -1;

982

}

772

free(buffer);

773

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

774

if(ret == -1){

775

perror("close");

983

776

}

777

gnutls_deinit(session);

984

778

return retval;

985

779

}

986

780

1003

797

/* Called whenever a service has been resolved successfully or

1004

798

timed out */

1005

799

1006

if(quit_now){

1007

return;

1008

}

1009

1010

800

switch(event){

1011

801

default:

1012

802

case AVAHI_RESOLVER_FAILURE:

1013

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

1014

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

1015

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

803

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

804

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

805

avahi_strerror(avahi_server_errno(mc.server)));

1017

806

break;

1018

807

1019

808

case AVAHI_RESOLVER_FOUND:

1021

810

char ip[AVAHI_ADDRESS_STR_MAX];

1022

811

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

1023

812

if(debug){

1024

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

1025

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

1026

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

813

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

814

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

815

ip, (intmax_t)interface, port);

1027

816

}

1028

817

int ret = start_mandos_communication(ip, port, interface,

1029

818

avahi_proto_to_af(proto));

1030

819

if(ret == 0){

1031

820

avahi_simple_poll_quit(mc.simple_poll);

1032

} else {

1033

if(not add_server(ip, port, interface,

1034

avahi_proto_to_af(proto))){

1035

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

1036

" list\n", name);

1037

}

1038

821

}

1039

822

}

1040

823

}

1056

839

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

1057

840

is removed from the LAN */

1058

841

1059

if(quit_now){

1060

return;

1061

}

1062

1063

842

switch(event){

1064

843

default:

1065

844

case AVAHI_BROWSER_FAILURE:

1066

845

1067

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

1068

avahi_strerror(avahi_server_errno(mc.server)));

846

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

847

avahi_strerror(avahi_server_errno(mc.server)));

1069

848

avahi_simple_poll_quit(mc.simple_poll);

1070

849

return;

1071

850

1075

854

the callback function is called the Avahi server will free the

1076

855

resolver for us. */

1077

856

1078

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

1079

name, type, domain, protocol, 0,

1080

resolve_callback, NULL) == NULL)

1081

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

1082

" %s\n", name,

1083

avahi_strerror(avahi_server_errno(mc.server)));

857

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

858

protocol, name, type, domain,

859

AVAHI_PROTO_INET6, 0,

860

resolve_callback, NULL)))

861

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

862

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

1084

863

break;

1085

864

1086

865

case AVAHI_BROWSER_REMOVE:

1089

868

case AVAHI_BROWSER_ALL_FOR_NOW:

1090

869

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1091

870

if(debug){

1092

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

1093

" searching...\n");

871

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

1094

872

}

1095

873

break;

1096

874

}

1097

875

}

1098

876

1099

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

1100

static void handle_sigterm(int sig){

877

sig_atomic_t quit_now = 0;

878

879

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

880

static void handle_sigterm(__attribute__((unused)) int sig){

1101

881

if(quit_now){

1102

882

return;

1103

883

}

1104

884

quit_now = 1;

1105

signal_received = sig;

1106

885

int old_errno = errno;

1107

/* set main loop to exit */

1108

886

if(mc.simple_poll != NULL){

1109

887

avahi_simple_poll_quit(mc.simple_poll);

1110

888

}

1111

889

errno = old_errno;

1112

890

}

1113

891

1114

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

1115

int ret;

1116

1117

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

1118

if(s < 0){

1119

perror_plus("socket");

1120

return false;

1121

}

1122

strcpy(ifr->ifr_name, ifname);

1123

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1124

if(ret == -1){

1125

if(debug){

1126

perror_plus("ioctl SIOCGIFFLAGS");

1127

}

1128

return false;

1129

}

1130

return true;

1131

}

1132

1133

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

1134

1135

/* Reject the loopback device */

1136

if(ifr->ifr_flags & IFF_LOOPBACK){

1137

if(debug){

1138

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

1139

ifname);

1140

}

1141

return false;

1142

}

1143

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

1144

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

1145

if(debug){

1146

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

1147

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

1148

}

1149

return true;

1150

}

1151

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

1152

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

1153

if(debug){

1154

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1155

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

1156

}

1157

return false;

1158

}

1159

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

1160

if(ifr->ifr_flags & IFF_NOARP){

1161

if(debug){

1162

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

1163

ifname);

1164

}

1165

return false;

1166

}

1167

1168

/* Accept this device */

1169

if(debug){

1170

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

1171

}

1172

return true;

1173

}

1174

1175

/*

1176

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

1177

* corresponds to an acceptable network device.

1178

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

1179

*/

1180

int good_interface(const struct dirent *if_entry){

1181

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

1182

return 0;

1183

}

1184

1185

struct ifreq ifr;

1186

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

1187

if(debug){

1188

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

1189

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

1190

}

1191

return 0;

1192

}

1193

1194

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

1195

return 0;

1196

}

1197

return 1;

1198

}

1199

1200

/*

1201

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

1202

* corresponds to an acceptable network device which is up.

1203

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

1204

*/

1205

int up_interface(const struct dirent *if_entry){

1206

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

1207

return 0;

1208

}

1209

1210

struct ifreq ifr;

1211

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

1212

if(debug){

1213

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

1214

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

1215

}

1216

return 0;

1217

}

1218

1219

/* Reject down interfaces */

1220

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

1221

if(debug){

1222

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

1223

if_entry->d_name);

1224

}

1225

return 0;

1226

}

1227

1228

/* Reject non-running interfaces */

1229

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

1230

if(debug){

1231

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

1232

if_entry->d_name);

1233

}

1234

return 0;

1235

}

1236

1237

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

1238

return 0;

1239

}

1240

return 1;

1241

}

1242

1243

int notdotentries(const struct dirent *direntry){

1244

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

1245

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

1246

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

1247

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

1248

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

1249

return 0;

1250

}

1251

return 1;

1252

}

1253

1254

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

1255

int runnable_hook(const struct dirent *direntry){

1256

int ret;

1257

size_t sret;

1258

struct stat st;

1259

1260

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

1261

/* Empty name? */

1262

return 0;

1263

}

1264

1265

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

1266

"abcdefghijklmnopqrstuvwxyz"

1267

"0123456789"

1268

"_-");

1269

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

1270

/* Contains non-allowed characters */

1271

if(debug){

1272

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

1273

direntry->d_name);

1274

}

1275

return 0;

1276

}

1277

1278

char *fullname = NULL;

1279

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

1280

if(ret < 0){

1281

perror_plus("asprintf");

1282

return 0;

1283

}

1284

1285

ret = stat(fullname, &st);

1286

if(ret == -1){

1287

if(debug){

1288

perror_plus("Could not stat hook");

1289

}

1290

return 0;

1291

}

1292

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

1293

/* Not a regular file */

1294

if(debug){

1295

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

1296

direntry->d_name);

1297

}

1298

return 0;

1299

}

1300

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

1301

/* Not executable */

1302

if(debug){

1303

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

1304

direntry->d_name);

1305

}

1306

return 0;

1307

}

1308

if(debug){

1309

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

1310

direntry->d_name);

1311

}

1312

return 1;

1313

}

1314

1315

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1316

int ret;

1317

struct timespec now;

1318

struct timespec waited_time;

1319

intmax_t block_time;

1320

1321

while(true){

1322

if(mc.current_server == NULL){

1323

if (debug){

1324

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

1325

" No timeout!\n");

1326

}

1327

ret = avahi_simple_poll_iterate(s, -1);

1328

} else {

1329

if (debug){

1330

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

1331

" it, or wait\n");

1332

}

1333

/* the current time */

1334

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1335

if(ret == -1){

1336

perror_plus("clock_gettime");

1337

return -1;

1338

}

1339

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

1340

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

1341

waited_time.tv_sec = (now.tv_sec

1342

- mc.current_server->last_seen.tv_sec);

1343

waited_time.tv_nsec = (now.tv_nsec

1344

- mc.current_server->last_seen.tv_nsec);

1345

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

1346

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

1347

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

1348

block_time = ((retry_interval

1349

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

1350

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

1351

1352

if (debug){

1353

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

1354

block_time);

1355

}

1356

1357

if(block_time <= 0){

1358

ret = start_mandos_communication(mc.current_server->ip,

1359

mc.current_server->port,

1360

mc.current_server->if_index,

1361

mc.current_server->af);

1362

if(ret == 0){

1363

avahi_simple_poll_quit(mc.simple_poll);

1364

return 0;

1365

}

1366

ret = clock_gettime(CLOCK_MONOTONIC,

1367

&mc.current_server->last_seen);

1368

if(ret == -1){

1369

perror_plus("clock_gettime");

1370

return -1;

1371

}

1372

mc.current_server = mc.current_server->next;

1373

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

1374

servers, but don't block */

1375

}

1376

1377

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

1378

}

1379

if(ret != 0){

1380

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

1381

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

1382

}

1383

}

1384

}

1385

}

1386

1387

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

1388

const float delay){

1389

struct dirent **direntries;

1390

struct dirent *direntry;

1391

int ret;

1392

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

1393

alphasort);

1394

if(numhooks == -1){

1395

perror_plus("scandir");

1396

} else {

1397

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

1398

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

1399

direntry = direntries[i];

1400

char *fullname = NULL;

1401

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

1402

if(ret < 0){

1403

perror_plus("asprintf");

1404

continue;

1405

}

1406

if(debug){

1407

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

1408

direntry->d_name);

1409

}

1410

pid_t hook_pid = fork();

1411

if(hook_pid == 0){

1412

/* Child */

1413

/* Raise privileges */

1414

errno = 0;

1415

ret = seteuid(0);

1416

if(ret == -1){

1417

perror_plus("seteuid");

1418

}

1419

/* Raise privileges even more */

1420

errno = 0;

1421

ret = setuid(0);

1422

if(ret == -1){

1423

perror_plus("setuid");

1424

}

1425

/* Set group */

1426

errno = 0;

1427

ret = setgid(0);

1428

if(ret == -1){

1429

perror_plus("setgid");

1430

}

1431

/* Reset supplementary groups */

1432

errno = 0;

1433

ret = setgroups(0, NULL);

1434

if(ret == -1){

1435

perror_plus("setgroups");

1436

}

1437

dup2(devnull, STDIN_FILENO);

1438

close(devnull);

1439

dup2(STDERR_FILENO, STDOUT_FILENO);

1440

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

1441

if(ret == -1){

1442

perror_plus("setenv");

1443

_exit(EX_OSERR);

1444

}

1445

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

1446

if(ret == -1){

1447

perror_plus("setenv");

1448

_exit(EX_OSERR);

1449

}

1450

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

1451

if(ret == -1){

1452

perror_plus("setenv");

1453

_exit(EX_OSERR);

1454

}

1455

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

1456

if(ret == -1){

1457

perror_plus("setenv");

1458

_exit(EX_OSERR);

1459

}

1460

char *delaystring;

1461

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

1462

if(ret == -1){

1463

perror_plus("asprintf");

1464

_exit(EX_OSERR);

1465

}

1466

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

1467

if(ret == -1){

1468

free(delaystring);

1469

perror_plus("setenv");

1470

_exit(EX_OSERR);

1471

}

1472

free(delaystring);

1473

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

1474

perror_plus("execl");

1475

} else {

1476

int status;

1477

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

1478

perror_plus("waitpid");

1479

free(fullname);

1480

continue;

1481

}

1482

if(WIFEXITED(status)){

1483

if(WEXITSTATUS(status) != 0){

1484

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

1485

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

1486

WEXITSTATUS(status));

1487

free(fullname);

1488

continue;

1489

}

1490

} else if(WIFSIGNALED(status)){

1491

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

1492

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

1493

WTERMSIG(status));

1494

free(fullname);

1495

continue;

1496

} else {

1497

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

1498

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

1499

free(fullname);

1500

continue;

1501

}

1502

}

1503

free(fullname);

1504

if(debug){

1505

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

1506

direntry->d_name);

1507

}

1508

}

1509

close(devnull);

1510

}

1511

return true;

1512

}

1513

1514

892

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

1515

893

AvahiSServiceBrowser *sb = NULL;

1516

894

int error;

1518

896

intmax_t tmpmax;

1519

897

char *tmp;

1520

898

int exitcode = EXIT_SUCCESS;

1521

const char *interface = "";

899

const char *interface = "eth0";

1522

900

struct ifreq network;

1523

int sd = -1;

1524

bool take_down_interface = false;

901

int sd;

1525

902

uid_t uid;

1526

903

gid_t gid;

904

char *connect_to = NULL;

1527

905

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

1528

906

bool tempdir_created = false;

1529

907

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1530

908

const char *seckey = PATHDIR "/" SECKEY;

1531

909

const char *pubkey = PATHDIR "/" PUBKEY;

1532

910

911

/* Initialize Mandos context */

912

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

913

.dh_bits = 1024, .priority = "SECURE256"

914

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

1533

915

bool gnutls_initialized = false;

1534

916

bool gpgme_initialized = false;

1535

917

float delay = 2.5f;

1536

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

1537

retrying the same server again */

1538

918

1539

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

struct sigaction old_sigterm_action;

1540

920

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1541

921

1542

uid = getuid();

1543

gid = getgid();

1544

1545

/* Lower any group privileges we might have, just to be safe */

1546

errno = 0;

1547

ret = setgid(gid);

1548

if(ret == -1){

1549

perror_plus("setgid");

1550

}

1551

1552

/* Lower user privileges (temporarily) */

1553

errno = 0;

1554

ret = seteuid(uid);

1555

if(ret == -1){

1556

perror_plus("seteuid");

1557

}

1558

1559

if(quit_now){

1560

goto end;

1561

}

1562

1563

922

{

1564

923

struct argp_option options[] = {

1565

924

{ .name = "debug", .key = 128,

1594

953

.arg = "SECONDS",

1595

954

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

1596

955

.group = 2 },

1597

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

1598

.arg = "SECONDS",

1599

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

1600

.group = 2 },

1601

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

1602

.arg = "DIR",

1603

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

1604

.group = 2 },

1605

/*

1606

* These reproduce what we would get without ARGP_NO_HELP

1607

*/

1608

{ .name = "help", .key = '?',

1609

.doc = "Give this help list", .group = -1 },

1610

{ .name = "usage", .key = -3,

1611

.doc = "Give a short usage message", .group = -1 },

1612

{ .name = "version", .key = 'V',

1613

.doc = "Print program version", .group = -1 },

1614

956

{ .name = NULL }

1615

957

};

1616

958

1617

959

error_t parse_opt(int key, char *arg,

1618

960

struct argp_state *state){

1619

errno = 0;

1620

961

switch(key){

1621

962

case 128: /* --debug */

1622

963

debug = true;

1638

979

tmpmax = strtoimax(arg, &tmp, 10);

1639

980

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

1640

981

or tmpmax != (typeof(mc.dh_bits))tmpmax){

1641

argp_error(state, "Bad number of DH bits");

982

fprintf(stderr, "Bad number of DH bits\n");

983

exit(EXIT_FAILURE);

1642

984

}

1643

985

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

1644

986

break;

1649

991

errno = 0;

1650

992

delay = strtof(arg, &tmp);

1651

993

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

1652

argp_error(state, "Bad delay");

1653

}

1654

case 132: /* --retry */

1655

errno = 0;

1656

retry_interval = strtod(arg, &tmp);

1657

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

1658

or (retry_interval * 1000) > INT_MAX

1659

or retry_interval < 0){

1660

argp_error(state, "Bad retry interval");

1661

}

1662

break;

1663

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

1664

hookdir = arg;

1665

break;

1666

/*

1667

* These reproduce what we would get without ARGP_NO_HELP

1668

*/

1669

case '?': /* --help */

1670

argp_state_help(state, state->out_stream,

1671

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1672

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1673

case -3: /* --usage */

1674

argp_state_help(state, state->out_stream,

1675

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1676

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

1677

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

1678

exit(argp_err_exit_status);

994

fprintf(stderr, "Bad delay\n");

995

exit(EXIT_FAILURE);

996

}

997

break;

998

case ARGP_KEY_ARG:

999

argp_usage(state);

1000

case ARGP_KEY_END:

1679

1001

break;

1680

1002

default:

1681

1003

return ARGP_ERR_UNKNOWN;

1682

1004

}

1683

return errno;

1005

return 0;

1684

1006

}

1685

1007

1686

1008

struct argp argp = { .options = options, .parser = parse_opt,

1687

1009

.args_doc = "",

1688

1010

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

1689

1011

" passwords from a Mandos server" };

1690

ret = argp_parse(&argp, argc, argv,

1691

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1692

switch(ret){

1693

case 0:

1694

break;

1695

case ENOMEM:

1696

default:

1697

errno = ret;

1698

perror_plus("argp_parse");

1699

exitcode = EX_OSERR;

1700

goto end;

1701

case EINVAL:

1702

exitcode = EX_USAGE;

1703

goto end;

1704

}

1705

}

1706

1707

{

1708

/* Work around Debian bug #633582:

1709

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

1710

1711

/* Re-raise priviliges */

1712

errno = 0;

1713

ret = seteuid(0);

1714

if(ret == -1){

1715

perror_plus("seteuid");

1716

} else {

1717

struct stat st;

1718

1719

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

1720

int seckey_fd = open(seckey, O_RDONLY);

1721

if(seckey_fd == -1){

1722

perror_plus("open");

1723

} else {

1724

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

1725

if(ret == -1){

1726

perror_plus("fstat");

1727

} else {

1728

if(S_ISREG(st.st_mode)

1729

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

1730

ret = fchown(seckey_fd, uid, gid);

1731

if(ret == -1){

1732

perror_plus("fchown");

1733

}

1734

}

1735

}

1736

TEMP_FAILURE_RETRY(close(seckey_fd));

1737

}

1738

}

1739

1740

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

1741

int pubkey_fd = open(pubkey, O_RDONLY);

1742

if(pubkey_fd == -1){

1743

perror_plus("open");

1744

} else {

1745

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

1746

if(ret == -1){

1747

perror_plus("fstat");

1748

} else {

1749

if(S_ISREG(st.st_mode)

1750

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

1751

ret = fchown(pubkey_fd, uid, gid);

1752

if(ret == -1){

1753

perror_plus("fchown");

1754

}

1755

}

1756

}

1757

TEMP_FAILURE_RETRY(close(pubkey_fd));

1758

}

1759

}

1760

1761

/* Lower privileges */

1762

errno = 0;

1763

ret = seteuid(uid);

1764

if(ret == -1){

1765

perror_plus("seteuid");

1766

}

1767

}

1768

}

1769

1770

/* Run network hooks */

1771

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

1772

goto end;

1012

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

1013

if(ret == ARGP_ERR_UNKNOWN){

1014

fprintf(stderr, "Unknown error while parsing arguments\n");

1015

exitcode = EXIT_FAILURE;

1016

goto end;

1017

}

1773

1018

}

1774

1019

1775

1020

if(not debug){

1776

1021

avahi_set_log_function(empty_log);

1777

1022

}

1778

1023

1779

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

1780

struct dirent **direntries;

1781

/* First look for interfaces that are up */

1782

ret = scandir(sys_class_net, &direntries, up_interface,

1783

alphasort);

1784

if(ret == 0){

1785

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

1786

free(direntries);

1787

ret = scandir(sys_class_net, &direntries, good_interface,

1788

alphasort);

1789

}

1790

if(ret >= 1){

1791

/* Pick the first interface returned */

1792

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

1793

if(debug){

1794

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

1795

}

1796

if(interface == NULL){

1797

perror_plus("malloc");

1798

free(direntries);

1799

exitcode = EXIT_FAILURE;

1800

goto end;

1801

}

1802

free(direntries);

1803

} else {

1804

free(direntries);

1805

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

1806

exitcode = EXIT_FAILURE;

1807

goto end;

1808

}

1809

}

1810

1811

1024

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

1812

1025

from the signal handler */

1813

1026

/* Initialize the pseudo-RNG for Avahi */

1814

1027

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

1815

1028

mc.simple_poll = avahi_simple_poll_new();

1816

1029

if(mc.simple_poll == NULL){

1817

fprintf_plus(stderr,

1818

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

1819

exitcode = EX_UNAVAILABLE;

1030

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

1031

exitcode = EXIT_FAILURE;

1820

1032

goto end;

1821

1033

}

1822

1034

1823

1035

sigemptyset(&sigterm_action.sa_mask);

1824

1036

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

1825

1037

if(ret == -1){

1826

perror_plus("sigaddset");

1827

exitcode = EX_OSERR;

1038

perror("sigaddset");

1039

exitcode = EXIT_FAILURE;

1828

1040

goto end;

1829

1041

}

1830

1042

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

1831

1043

if(ret == -1){

1832

perror_plus("sigaddset");

1833

exitcode = EX_OSERR;

1044

perror("sigaddset");

1045

exitcode = EXIT_FAILURE;

1834

1046

goto end;

1835

1047

}

1836

1048

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

1837

1049

if(ret == -1){

1838

perror_plus("sigaddset");

1839

exitcode = EX_OSERR;

1840

goto end;

1841

}

1842

/* Need to check if the handler is SIG_IGN before handling:

1843

| [[info:libc:Initial Signal Actions]] |

1844

| [[info:libc:Basic Signal Handling]] |

1845

*/

1846

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

1847

if(ret == -1){

1848

perror_plus("sigaction");

1849

return EX_OSERR;

1850

}

1851

if(old_sigterm_action.sa_handler != SIG_IGN){

1852

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

1853

if(ret == -1){

1854

perror_plus("sigaction");

1855

exitcode = EX_OSERR;

1856

goto end;

1857

}

1858

}

1859

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

1860

if(ret == -1){

1861

perror_plus("sigaction");

1862

return EX_OSERR;

1863

}

1864

if(old_sigterm_action.sa_handler != SIG_IGN){

1865

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

1866

if(ret == -1){

1867

perror_plus("sigaction");

1868

exitcode = EX_OSERR;

1869

goto end;

1870

}

1871

}

1872

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

1873

if(ret == -1){

1874

perror_plus("sigaction");

1875

return EX_OSERR;

1876

}

1877

if(old_sigterm_action.sa_handler != SIG_IGN){

1878

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

1879

if(ret == -1){

1880

perror_plus("sigaction");

1881

exitcode = EX_OSERR;

1882

goto end;

1883

}

1884

}

1050

perror("sigaddset");

1051

exitcode = EXIT_FAILURE;

1052

goto end;

1053

}

1054

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

1055

if(ret == -1){

1056

perror("sigaction");

1057

exitcode = EXIT_FAILURE;

1058

goto end;

1059

}

1885

1060

1886

1061

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

1887

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

1888

if_index = (AvahiIfIndex) if_nametoindex(interface);

1889

if(if_index == 0){

1890

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

1891

exitcode = EX_UNAVAILABLE;

1892

goto end;

1893

}

1894

1895

if(quit_now){

1896

goto end;

1897

}

1898

1899

/* Re-raise priviliges */

1900

errno = 0;

1901

ret = seteuid(0);

1902

if(ret == -1){

1903

perror_plus("seteuid");

1904

}

1905

1062

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

1906

1063

#ifdef __linux__

1907

1064

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1908

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

1065

messages to mess up the prompt */

1909

1066

ret = klogctl(8, NULL, 5);

1910

1067

bool restore_loglevel = true;

1911

1068

if(ret == -1){

1912

1069

restore_loglevel = false;

1913

perror_plus("klogctl");

1070

perror("klogctl");

1914

1071

}

1915

1072

#endif /* __linux__ */

1916

1073

1917

1074

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1918

1075

if(sd < 0){

1919

perror_plus("socket");

1920

exitcode = EX_OSERR;

1076

perror("socket");

1077

exitcode = EXIT_FAILURE;

1921

1078

#ifdef __linux__

1922

1079

if(restore_loglevel){

1923

1080

ret = klogctl(7, NULL, 0);

1924

1081

if(ret == -1){

1925

perror_plus("klogctl");

1082

perror("klogctl");

1926

1083

}

1927

1084

}

1928

1085

#endif /* __linux__ */

1929

/* Lower privileges */

1930

errno = 0;

1931

ret = seteuid(uid);

1932

if(ret == -1){

1933

perror_plus("seteuid");

1934

}

1935

1086

goto end;

1936

1087

}

1937

1088

strcpy(network.ifr_name, interface);

1938

1089

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

1939

1090

if(ret == -1){

1940

perror_plus("ioctl SIOCGIFFLAGS");

1091

perror("ioctl SIOCGIFFLAGS");

1941

1092

#ifdef __linux__

1942

1093

if(restore_loglevel){

1943

1094

ret = klogctl(7, NULL, 0);

1944

1095

if(ret == -1){

1945

perror_plus("klogctl");

1096

perror("klogctl");

1946

1097

}

1947

1098

}

1948

1099

#endif /* __linux__ */

1949

exitcode = EX_OSERR;

1950

/* Lower privileges */

1951

errno = 0;

1952

ret = seteuid(uid);

1953

if(ret == -1){

1954

perror_plus("seteuid");

1955

}

1100

exitcode = EXIT_FAILURE;

1956

1101

goto end;

1957

1102

}

1958

1103

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

1959

1104

network.ifr_flags |= IFF_UP;

1960

take_down_interface = true;

1961

1105

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

1962

1106

if(ret == -1){

1963

take_down_interface = false;

1964

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1965

exitcode = EX_OSERR;

1107

perror("ioctl SIOCSIFFLAGS");

1108

exitcode = EXIT_FAILURE;

1966

1109

#ifdef __linux__

1967

1110

if(restore_loglevel){

1968

1111

ret = klogctl(7, NULL, 0);

1969

1112

if(ret == -1){

1970

perror_plus("klogctl");

1113

perror("klogctl");

1971

1114

}

1972

1115

}

1973

1116

#endif /* __linux__ */

1974

/* Lower privileges */

1975

errno = 0;

1976

ret = seteuid(uid);

1977

if(ret == -1){

1978

perror_plus("seteuid");

1979

}

1980

1117

goto end;

1981

1118

}

1982

1119

}

1983

/* Sleep checking until interface is running.

1984

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

1120

/* sleep checking until interface is running */

1985

1121

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

1986

1122

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

1987

1123

if(ret == -1){

1988

perror_plus("ioctl SIOCGIFFLAGS");

1124

perror("ioctl SIOCGIFFLAGS");

1989

1125

} else if(network.ifr_flags & IFF_RUNNING){

1990

1126

break;

1991

1127

}

1992

1128

struct timespec sleeptime = { .tv_nsec = 250000000 };

1993

1129

ret = nanosleep(&sleeptime, NULL);

1994

1130

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

1995

perror_plus("nanosleep");

1131

perror("nanosleep");

1996

1132

}

1997

1133

}

1998

if(not take_down_interface){

1999

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

2000

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

2001

if(ret == -1){

2002

perror_plus("close");

2003

}

1134

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

1135

if(ret == -1){

1136

perror("close");

2004

1137

}

2005

1138

#ifdef __linux__

2006

1139

if(restore_loglevel){

2007

1140

/* Restores kernel loglevel to default */

2008

1141

ret = klogctl(7, NULL, 0);

2009

1142

if(ret == -1){

2010

perror_plus("klogctl");

1143

perror("klogctl");

2011

1144

}

2012

1145

}

2013

1146

#endif /* __linux__ */

2014

/* Lower privileges */

2015

errno = 0;

2016

/* Lower privileges */

2017

ret = seteuid(uid);

2018

if(ret == -1){

2019

perror_plus("seteuid");

2020

}

2021

}

2022

2023

if(quit_now){

2024

goto end;

1147

}

1148

1149

uid = getuid();

1150

gid = getgid();

1151

1152

errno = 0;

1153

setgid(gid);

1154

if(ret == -1){

1155

perror("setgid");

1156

}

1157

1158

ret = setuid(uid);

1159

if(ret == -1){

1160

perror("setuid");

2025

1161

}

2026

1162

2027

1163

ret = init_gnutls_global(pubkey, seckey);

2028

1164

if(ret == -1){

2029

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

2030

exitcode = EX_UNAVAILABLE;

1165

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

1166

exitcode = EXIT_FAILURE;

2031

1167

goto end;

2032

1168

} else {

2033

1169

gnutls_initialized = true;

2034

1170

}

2035

1171

2036

if(quit_now){

2037

goto end;

2038

}

2039

2040

1172

if(mkdtemp(tempdir) == NULL){

2041

perror_plus("mkdtemp");

1173

perror("mkdtemp");

2042

1174

goto end;

2043

1175

}

2044

1176

tempdir_created = true;

2045

1177

2046

if(quit_now){

2047

goto end;

2048

}

2049

2050

1178

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

2051

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

2052

exitcode = EX_UNAVAILABLE;

1179

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

1180

exitcode = EXIT_FAILURE;

2053

1181

goto end;

2054

1182

} else {

2055

1183

gpgme_initialized = true;

2056

1184

}

2057

1185

2058

if(quit_now){

2059

goto end;

1186

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

1187

if_index = (AvahiIfIndex) if_nametoindex(interface);

1188

if(if_index == 0){

1189

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

1190

exitcode = EXIT_FAILURE;

1191

goto end;

1192

}

2060

1193

}

2061

1194

2062

1195

if(connect_to != NULL){

2064

1197

/* (Mainly meant for debugging) */

2065

1198

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

2066

1199

if(address == NULL){

2067

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

2068

exitcode = EX_USAGE;

2069

goto end;

2070

}

2071

2072

if(quit_now){

2073

goto end;

2074

}

2075

1200

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

1201

exitcode = EXIT_FAILURE;

1202

goto end;

1203

}

2076

1204

uint16_t port;

2077

1205

errno = 0;

2078

1206

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

2079

1207

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

2080

1208

or tmpmax != (uint16_t)tmpmax){

2081

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

2082

exitcode = EX_USAGE;

2083

goto end;

2084

}

2085

2086

if(quit_now){

2087

goto end;

2088

}

2089

1209

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

1210

exitcode = EXIT_FAILURE;

1211

goto end;

1212

}

2090

1213

port = (uint16_t)tmpmax;

2091

1214

*address = '\0';

1215

address = connect_to;

2092

1216

/* Colon in address indicates IPv6 */

2093

1217

int af;

2094

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

1218

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

2095

1219

af = AF_INET6;

2096

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

2097

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

2098

{

2099

connect_to++;

2100

address[-1] = '\0';

2101

}

2102

1220

} else {

2103

1221

af = AF_INET;

2104

1222

}

2105

address = connect_to;

2106

2107

if(quit_now){

2108

goto end;

2109

}

2110

2111

while(not quit_now){

2112

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

2113

if(quit_now or ret == 0){

2114

break;

2115

}

2116

if(debug){

2117

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

2118

(int)retry_interval);

2119

}

2120

sleep((int)retry_interval);

2121

}

2122

2123

if (not quit_now){

1223

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

1224

if(ret < 0){

1225

exitcode = EXIT_FAILURE;

1226

} else {

2124

1227

exitcode = EXIT_SUCCESS;

2125

1228

}

1229

goto end;

1230

}

2126

1231

2127

goto end;

2128

}

2129

2130

if(quit_now){

2131

goto end;

2132

}

2133

2134

1232

{

2135

1233

AvahiServerConfig config;

2136

1234

/* Do not publish any local Zeroconf records */

2151

1249

2152

1250

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

2153

1251

if(mc.server == NULL){

2154

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

2155

avahi_strerror(error));

2156

exitcode = EX_UNAVAILABLE;

2157

goto end;

2158

}

2159

2160

if(quit_now){

1252

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

1253

avahi_strerror(error));

1254

exitcode = EXIT_FAILURE;

2161

1255

goto end;

2162

1256

}

2163

1257

2164

1258

/* Create the Avahi service browser */

2165

1259

sb = avahi_s_service_browser_new(mc.server, if_index,

2166

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1260

AVAHI_PROTO_INET6, "_mandos._tcp",

2167

1261

NULL, 0, browse_callback, NULL);

2168

1262

if(sb == NULL){

2169

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

2170

avahi_strerror(avahi_server_errno(mc.server)));

2171

exitcode = EX_UNAVAILABLE;

2172

goto end;

2173

}

2174

2175

if(quit_now){

1263

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

1264

avahi_strerror(avahi_server_errno(mc.server)));

1265

exitcode = EXIT_FAILURE;

2176

1266

goto end;

2177

1267

}

2178

1268

2179

1269

/* Run the main loop */

2180

1270

2181

1271

if(debug){

2182

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

2183

}

2184

2185

ret = avahi_loop_with_timeout(mc.simple_poll,

2186

(int)(retry_interval * 1000));

2187

if(debug){

2188

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

2189

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

2190

}

1272

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

1273

}

1274

1275

avahi_simple_poll_loop(mc.simple_poll);

2191

1276

2192

1277

end:

2193

1278

2194

1279

if(debug){

2195

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

1280

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

2196

1281

}

2197

1282

2198

1283

/* Cleanup things */

2215

1300

gpgme_release(mc.ctx);

2216

1301

}

2217

1302

2218

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

2219

has seen */

2220

if(mc.current_server != NULL){

2221

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

2222

while(mc.current_server != NULL){

2223

server *next = mc.current_server->next;

2224

free(mc.current_server);

2225

mc.current_server = next;

2226

}

2227

}

2228

2229

/* Run network hooks */

2230

run_network_hooks("stop", interface, delay);

2231

2232

/* Re-raise priviliges */

2233

{

2234

errno = 0;

2235

ret = seteuid(0);

2236

if(ret == -1){

2237

perror_plus("seteuid");

2238

}

2239

2240

/* Take down the network interface */

2241

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

2242

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

2243

if(ret == -1){

2244

perror_plus("ioctl SIOCGIFFLAGS");

2245

} else if(network.ifr_flags & IFF_UP){

2246

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

2247

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

2248

if(ret == -1){

2249

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2250

}

2251

}

2252

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

2253

if(ret == -1){

2254

perror_plus("close");

2255

}

2256

}

2257

}

2258

/* Lower privileges permanently */

2259

errno = 0;

2260

ret = setuid(uid);

2261

if(ret == -1){

2262

perror_plus("setuid");

2263

}

2264

2265

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

1303

/* Removes the temp directory used by GPGME */

2266

1304

if(tempdir_created){

2267

struct dirent **direntries = NULL;

2268

struct dirent *direntry = NULL;

2269

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

2270

alphasort);

2271

if (numentries > 0){

2272

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

2273

direntry = direntries[i];

1305

DIR *d;

1306

struct dirent *direntry;

1307

d = opendir(tempdir);

1308

if(d == NULL){

1309

if(errno != ENOENT){

1310

perror("opendir");

1311

}

1312

} else {

1313

while(true){

1314

direntry = readdir(d);

1315

if(direntry == NULL){

1316

break;

1317

}

1318

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

1319

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

1320

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

1321

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

1322

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

1323

continue;

1324

}

2274

1325

char *fullname = NULL;

2275

1326

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

2276

1327

direntry->d_name);

2277

1328

if(ret < 0){

2278

perror_plus("asprintf");

1329

perror("asprintf");

2279

1330

continue;

2280

1331

}

2281

1332

ret = remove(fullname);

2282

1333

if(ret == -1){

2283

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

2284

strerror(errno));

1334

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

1335

strerror(errno));

2285

1336

}

2286

1337

free(fullname);

2287

1338

}

2288

}

2289

2290

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

2291

free(direntries);

2292

if (numentries == -1){

2293

perror_plus("scandir");

1339

closedir(d);

2294

1340

}

2295

1341

ret = rmdir(tempdir);

2296

1342

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

2297

perror_plus("rmdir");

2298

}

2299

}

2300

2301

if(quit_now){

2302

sigemptyset(&old_sigterm_action.sa_mask);

2303

old_sigterm_action.sa_handler = SIG_DFL;

2304

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2305

&old_sigterm_action,

2306

NULL));

2307

if(ret == -1){

2308

perror_plus("sigaction");

2309

}

2310

do {

2311

ret = raise(signal_received);

2312

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

2313

if(ret != 0){

2314

perror_plus("raise");

2315

abort();

2316

}

2317

TEMP_FAILURE_RETRY(pause());

1343

perror("rmdir");

1344

}

2318

1345

}

2319

1346

2320

1347

return exitcode;