/mandos/release : revision 237.7.73

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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@fukt.bsnet.se>.

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

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*/

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32

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

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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, EXIT_FAILURE,

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srand(), strtof() */

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

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strtof(), abort() */

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

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

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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

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strtoimax() */

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

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

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

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

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program_invocation_short_name */

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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INET_ADDRSTRLEN, INET6_ADDRSTRLEN

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*/

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74

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

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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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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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#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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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, sigaction,

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sig_atomic_t */

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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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#ifdef __linux__

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93

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

105

111

init_gnutls_session(),

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112

GNUTLS_* */

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113

#include <gnutls/openpgp.h>

108

/* 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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116

111

117

/* GPGME */

112

118

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

120

126

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

121

127

#define SECKEY "seckey.txt"

122

128

#define PUBKEY "pubkey.txt"

129

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

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130

124

131

bool debug = false;

125

132

static const char mandos_protocol_version[] = "1";

126

133

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

127

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

134

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

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static const char sys_class_net[] = "/sys/class/net";

136

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 */

140

typedef struct server{

141

const char *ip;

142

uint16_t port;

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AvahiIfIndex if_index;

144

int af;

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struct timespec last_seen;

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struct server *next;

147

struct server *prev;

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} server;

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149

129

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

130

151

typedef struct {

135

156

gnutls_dh_params_t dh_params;

136

157

const char *priority;

137

158

gpgme_ctx_t ctx;

159

server *current_server;

138

160

} mandos_context;

139

161

140

162

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

141

163

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

142

164

.dh_bits = 1024, .priority = "SECURE256"

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

165

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

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.current_server = NULL };

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168

sig_atomic_t quit_now = 0;

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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

}

144

186

145

187

/*

146

188

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

148

190

* "buffer_length" is how much is already used.

149

191

*/

150

192

size_t incbuffer(char **buffer, size_t buffer_length,

151

size_t buffer_capacity){

193

size_t buffer_capacity){

152

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

153

195

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

154

196

if(buffer == NULL){

159

201

return buffer_capacity;

160

202

}

161

203

204

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

205

int 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 -1;

212

}

213

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

214

.port = port,

215

.if_index = if_index,

216

.af = af };

217

if(new_server->ip == NULL){

218

perror_plus("strdup");

219

return -1;

220

}

221

/* Special case of first server */

222

if (mc.current_server == NULL){

223

new_server->next = new_server;

224

new_server->prev = new_server;

225

mc.current_server = new_server;

226

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

227

} else {

228

new_server->next = mc.current_server;

229

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

230

new_server->prev->next = new_server;

231

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 -1;

237

}

238

return 0;

239

}

240

162

241

/*

163

242

* Initialize GPGME.

164

243

*/

165

static bool init_gpgme(const char *seckey,

166

const char *pubkey, const char *tempdir){

167

int ret;

244

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

245

const char *tempdir){

168

246

gpgme_error_t rc;

169

247

gpgme_engine_info_t engine_info;

170

248

173

251

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

174

252

*/

175

253

bool import_key(const char *filename){

254

int ret;

176

255

int fd;

177

256

gpgme_data_t pgp_data;

178

257

179

258

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

180

259

if(fd == -1){

181

perror("open");

260

perror_plus("open");

182

261

return false;

183

262

}

184

263

185

264

rc = gpgme_data_new_from_fd(&pgp_data, fd);

186

265

if(rc != GPG_ERR_NO_ERROR){

187

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

188

gpgme_strsource(rc), gpgme_strerror(rc));

266

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

267

gpgme_strsource(rc), gpgme_strerror(rc));

189

268

return false;

190

269

}

191

270

192

271

rc = gpgme_op_import(mc.ctx, pgp_data);

193

272

if(rc != GPG_ERR_NO_ERROR){

194

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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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275

return false;

197

276

}

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277

199

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

200

279

if(ret == -1){

201

perror("close");

280

perror_plus("close");

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281

}

203

282

gpgme_data_release(pgp_data);

204

283

return true;

205

284

}

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285

207

286

if(debug){

208

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

287

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

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288

}

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289

211

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/* Init GPGME */

212

291

gpgme_check_version(NULL);

213

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

214

293

if(rc != GPG_ERR_NO_ERROR){

215

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

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gpgme_strsource(rc), gpgme_strerror(rc));

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

217

296

return false;

218

297

}

219

298

220

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

299

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

221

300

rc = gpgme_get_engine_info(&engine_info);

222

301

if(rc != GPG_ERR_NO_ERROR){

223

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

224

gpgme_strsource(rc), gpgme_strerror(rc));

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

225

304

return false;

226

305

}

227

306

while(engine_info != NULL){

233

312

engine_info = engine_info->next;

234

313

}

235

314

if(engine_info == NULL){

236

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

315

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

316

tempdir);

237

317

return false;

238

318

}

239

319

240

320

/* Create new GPGME "context" */

241

321

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

242

322

if(rc != GPG_ERR_NO_ERROR){

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

323

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

324

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

325

gpgme_strerror(rc));

245

326

return false;

246

327

}

247

328

249

330

return false;

250

331

}

251

332

252

return true;

333

return true;

253

334

}

254

335

255

336

/*

266

347

ssize_t plaintext_length = 0;

267

348

268

349

if(debug){

269

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

350

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

270

351

}

271

352

272

353

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

273

354

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

274

355

0);

275

356

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

278

359

return -1;

279

360

}

280

361

281

362

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

282

363

rc = gpgme_data_new(&dh_plain);

283

364

if(rc != GPG_ERR_NO_ERROR){

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

286

368

gpgme_data_release(dh_crypto);

287

369

return -1;

288

370

}

291

373

data buffer */

292

374

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

293

375

if(rc != GPG_ERR_NO_ERROR){

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

296

378

plaintext_length = -1;

297

379

if(debug){

298

380

gpgme_decrypt_result_t result;

299

381

result = gpgme_op_decrypt_result(mc.ctx);

300

382

if(result == NULL){

301

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

383

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

302

384

} else {

303

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

304

result->unsupported_algorithm);

305

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

306

result->wrong_key_usage);

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);

307

389

if(result->file_name != NULL){

308

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

390

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

309

391

}

310

392

gpgme_recipient_t recipient;

311

393

recipient = result->recipients;

312

394

while(recipient != NULL){

313

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

314

gpgme_pubkey_algo_name(recipient->pubkey_algo));

315

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

316

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

317

recipient->status == GPG_ERR_NO_SECKEY

318

? "No" : "Yes");

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");

319

402

recipient = recipient->next;

320

403

}

321

404

}

324

407

}

325

408

326

409

if(debug){

327

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

410

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

328

411

}

329

412

330

413

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

331

414

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

332

perror("gpgme_data_seek");

415

perror_plus("gpgme_data_seek");

333

416

plaintext_length = -1;

334

417

goto decrypt_end;

335

418

}

337

420

*plaintext = NULL;

338

421

while(true){

339

422

plaintext_capacity = incbuffer(plaintext,

340

(size_t)plaintext_length,

341

plaintext_capacity);

423

(size_t)plaintext_length,

424

plaintext_capacity);

342

425

if(plaintext_capacity == 0){

343

perror("incbuffer");

344

plaintext_length = -1;

345

goto decrypt_end;

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

346

429

}

347

430

348

431

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

353

436

break;

354

437

}

355

438

if(ret < 0){

356

perror("gpgme_data_read");

439

perror_plus("gpgme_data_read");

357

440

plaintext_length = -1;

358

441

goto decrypt_end;

359

442

}

361

444

}

362

445

363

446

if(debug){

364

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

447

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

365

448

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

366

449

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

367

450

}

389

472

/* GnuTLS log function callback */

390

473

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

391

474

const char* string){

392

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

475

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

393

476

}

394

477

395

478

static int init_gnutls_global(const char *pubkeyfilename,

397

480

int ret;

398

481

399

482

if(debug){

400

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

483

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

401

484

}

402

485

403

486

ret = gnutls_global_init();

404

487

if(ret != GNUTLS_E_SUCCESS){

405

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

406

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

407

490

return -1;

408

491

}

409

492

416

499

}

417

500

418

501

/* OpenPGP credentials */

419

gnutls_certificate_allocate_credentials(&mc.cred);

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

420

503

if(ret != GNUTLS_E_SUCCESS){

421

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

422

from

423

-Wunreachable-code

424

*/

425

safer_gnutls_strerror(ret));

504

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

505

safer_gnutls_strerror(ret));

426

506

gnutls_global_deinit();

427

507

return -1;

428

508

}

429

509

430

510

if(debug){

431

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

432

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

433

seckeyfilename);

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

434

515

}

435

516

436

517

ret = gnutls_certificate_set_openpgp_key_file

437

518

(mc.cred, pubkeyfilename, seckeyfilename,

438

519

GNUTLS_OPENPGP_FMT_BASE64);

439

520

if(ret != GNUTLS_E_SUCCESS){

440

fprintf(stderr,

441

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

442

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

443

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

444

safer_gnutls_strerror(ret));

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));

445

526

goto globalfail;

446

527

}

447

528

448

529

/* GnuTLS server initialization */

449

530

ret = gnutls_dh_params_init(&mc.dh_params);

450

531

if(ret != GNUTLS_E_SUCCESS){

451

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

452

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

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

453

535

goto globalfail;

454

536

}

455

537

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

456

538

if(ret != GNUTLS_E_SUCCESS){

457

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

458

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

459

541

goto globalfail;

460

542

}

461

543

474

556

static int init_gnutls_session(gnutls_session_t *session){

475

557

int ret;

476

558

/* GnuTLS session creation */

477

ret = gnutls_init(session, GNUTLS_SERVER);

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);

478

565

if(ret != GNUTLS_E_SUCCESS){

479

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

480

safer_gnutls_strerror(ret));

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

481

569

}

482

570

483

571

{

484

572

const char *err;

485

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

486

580

if(ret != GNUTLS_E_SUCCESS){

487

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

488

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

489

safer_gnutls_strerror(ret));

581

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

582

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

583

safer_gnutls_strerror(ret));

490

584

gnutls_deinit(*session);

491

585

return -1;

492

586

}

493

587

}

494

588

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

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);

497

597

if(ret != GNUTLS_E_SUCCESS){

498

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

499

safer_gnutls_strerror(ret));

598

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

599

safer_gnutls_strerror(ret));

500

600

gnutls_deinit(*session);

501

601

return -1;

502

602

}

503

603

504

604

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

605

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

606

508

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

608

518

617

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

519

618

AvahiIfIndex if_index,

520

619

int af){

521

int ret, tcp_sd;

620

int ret, tcp_sd = -1;

522

621

ssize_t sret;

523

622

union {

524

623

struct sockaddr_in in;

525

624

struct sockaddr_in6 in6;

526

625

} to;

527

626

char *buffer = NULL;

528

char *decrypted_buffer;

627

char *decrypted_buffer = NULL;

529

628

size_t buffer_length = 0;

530

629

size_t buffer_capacity = 0;

531

ssize_t decrypted_buffer_size;

532

630

size_t written;

533

int retval = 0;

631

int retval = -1;

534

632

gnutls_session_t session;

535

633

int pf; /* Protocol family */

536

634

635

errno = 0;

636

637

if(quit_now){

638

errno = EINTR;

639

return -1;

640

}

641

537

642

switch(af){

538

643

case AF_INET6:

539

644

pf = PF_INET6;

542

647

pf = PF_INET;

543

648

break;

544

649

default:

545

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

650

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

651

errno = EINVAL;

546

652

return -1;

547

653

}

548

654

552

658

}

553

659

554

660

if(debug){

555

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

556

"\n", ip, port);

661

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

662

PRIu16 "\n", ip, port);

557

663

}

558

664

559

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

560

666

if(tcp_sd < 0){

561

perror("socket");

562

return -1;

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;

563

676

}

564

677

565

678

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

571

684

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

572

685

}

573

686

if(ret < 0 ){

574

perror("inet_pton");

575

return -1;

687

int e = errno;

688

perror_plus("inet_pton");

689

errno = e;

690

goto mandos_end;

576

691

}

577

692

if(ret == 0){

578

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

579

return -1;

693

int e = errno;

694

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

695

errno = e;

696

goto mandos_end;

580

697

}

581

698

if(af == AF_INET6){

582

699

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

585

702

586

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

587

704

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

588

-Wunreachable-code*/

705

-Wunreachable-code*/

589

706

if(if_index == AVAHI_IF_UNSPEC){

590

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

591

" without a network interface\n");

592

return -1;

707

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

708

" incomplete without a network interface\n");

709

errno = EINVAL;

710

goto mandos_end;

593

711

}

594

712

/* Set the network interface number as scope */

595

713

to.in6.sin6_scope_id = (uint32_t)if_index;

600

718

-Wunreachable-code */

601

719

}

602

720

721

if(quit_now){

722

errno = EINTR;

723

goto mandos_end;

724

}

725

603

726

if(debug){

604

727

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

605

728

char interface[IF_NAMESIZE];

606

729

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

607

perror("if_indextoname");

730

perror_plus("if_indextoname");

608

731

} else {

609

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

610

ip, interface, port);

732

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

733

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

611

734

}

612

735

} else {

613

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

614

port);

736

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

737

ip, port);

615

738

}

616

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

617

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

624

747

sizeof(addrstr));

625

748

}

626

749

if(pcret == NULL){

627

perror("inet_ntop");

750

perror_plus("inet_ntop");

628

751

} else {

629

752

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

630

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

753

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

631

754

}

632

755

}

633

756

}

634

757

758

if(quit_now){

759

errno = EINTR;

760

goto mandos_end;

761

}

762

635

763

if(af == AF_INET6){

636

764

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

637

765

} else {

638

766

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

639

767

}

640

768

if(ret < 0){

641

perror("connect");

642

return -1;

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;

643

780

}

644

781

645

782

const char *out = mandos_protocol_version;

647

784

while(true){

648

785

size_t out_size = strlen(out);

649

786

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

650

out_size - written));

787

out_size - written));

651

788

if(ret == -1){

652

perror("write");

653

retval = -1;

789

int e = errno;

790

perror_plus("write");

791

errno = e;

654

792

goto mandos_end;

655

793

}

656

794

written += (size_t)ret;

664

802

break;

665

803

}

666

804

}

805

806

if(quit_now){

807

errno = EINTR;

808

goto mandos_end;

809

}

667

810

}

668

811

669

812

if(debug){

670

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

671

}

672

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 */

673

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

674

823

675

do{

824

if(quit_now){

825

errno = EINTR;

826

goto mandos_end;

827

}

828

829

do {

676

830

ret = gnutls_handshake(session);

831

if(quit_now){

832

errno = EINTR;

833

goto mandos_end;

834

}

677

835

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

678

836

679

837

if(ret != GNUTLS_E_SUCCESS){

680

838

if(debug){

681

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

839

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

682

840

gnutls_perror(ret);

683

841

}

684

retval = -1;

842

errno = EPROTO;

685

843

goto mandos_end;

686

844

}

687

845

688

846

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

689

847

690

848

if(debug){

691

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

692

ip);

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

693

851

}

694

852

695

853

while(true){

854

855

if(quit_now){

856

errno = EINTR;

857

goto mandos_end;

858

}

859

696

860

buffer_capacity = incbuffer(&buffer, buffer_length,

697

buffer_capacity);

861

buffer_capacity);

698

862

if(buffer_capacity == 0){

699

perror("incbuffer");

700

retval = -1;

863

int e = errno;

864

perror_plus("incbuffer");

865

errno = e;

866

goto mandos_end;

867

}

868

869

if(quit_now){

870

errno = EINTR;

701

871

goto mandos_end;

702

872

}

703

873

712

882

case GNUTLS_E_AGAIN:

713

883

break;

714

884

case GNUTLS_E_REHANDSHAKE:

715

do{

885

do {

716

886

ret = gnutls_handshake(session);

887

888

if(quit_now){

889

errno = EINTR;

890

goto mandos_end;

891

}

717

892

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

718

893

if(ret < 0){

719

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

894

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

895

"***\n");

720

896

gnutls_perror(ret);

721

retval = -1;

897

errno = EPROTO;

722

898

goto mandos_end;

723

899

}

724

900

break;

725

901

default:

726

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

727

" encrypted session with Mandos server\n");

728

retval = -1;

902

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

903

" encrypted session with Mandos server\n");

729

904

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

errno = EIO;

730

906

goto mandos_end;

731

907

}

732

908

} else {

735

911

}

736

912

737

913

if(debug){

738

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

739

}

740

741

gnutls_bye(session, GNUTLS_SHUT_RDWR);

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);

742

929

743

930

if(buffer_length > 0){

744

decrypted_buffer_size = pgp_packet_decrypt(buffer,

745

buffer_length,

931

ssize_t decrypted_buffer_size;

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

746

933

&decrypted_buffer);

747

934

if(decrypted_buffer_size >= 0){

935

748

936

written = 0;

749

937

while(written < (size_t) decrypted_buffer_size){

938

if(quit_now){

939

errno = EINTR;

940

goto mandos_end;

941

}

942

750

943

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

751

944

(size_t)decrypted_buffer_size - written,

752

945

stdout);

753

946

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

947

int e = errno;

754

948

if(debug){

755

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

756

strerror(errno));

949

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

950

strerror(errno));

757

951

}

758

retval = -1;

759

break;

952

errno = e;

953

goto mandos_end;

760

954

}

761

955

written += (size_t)ret;

762

956

}

763

free(decrypted_buffer);

764

} else {

765

retval = -1;

957

retval = 0;

766

958

}

767

} else {

768

retval = -1;

769

959

}

770

960

771

961

/* Shutdown procedure */

772

962

773

963

mandos_end:

774

free(buffer);

775

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

776

if(ret == -1){

777

perror("close");

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

}

778

983

}

779

gnutls_deinit(session);

780

984

return retval;

781

985

}

782

986

799

1003

/* Called whenever a service has been resolved successfully or

800

1004

timed out */

801

1005

1006

if(quit_now){

1007

return;

1008

}

1009

802

1010

switch(event){

803

1011

default:

804

1012

case AVAHI_RESOLVER_FAILURE:

805

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

806

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

807

avahi_strerror(avahi_server_errno(mc.server)));

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)));

808

1017

break;

809

1018

810

1019

case AVAHI_RESOLVER_FOUND:

812

1021

char ip[AVAHI_ADDRESS_STR_MAX];

813

1022

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

814

1023

if(debug){

815

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

816

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

817

ip, (intmax_t)interface, port);

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);

818

1027

}

819

1028

int ret = start_mandos_communication(ip, port, interface,

820

1029

avahi_proto_to_af(proto));

821

1030

if(ret == 0){

822

1031

avahi_simple_poll_quit(mc.simple_poll);

1032

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

823

1035

}

824

1036

}

825

1037

}

841

1053

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

842

1054

is removed from the LAN */

843

1055

1056

if(quit_now){

1057

return;

1058

}

1059

844

1060

switch(event){

845

1061

default:

846

1062

case AVAHI_BROWSER_FAILURE:

847

1063

848

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

849

avahi_strerror(avahi_server_errno(mc.server)));

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

850

1066

avahi_simple_poll_quit(mc.simple_poll);

851

1067

return;

852

1068

859

1075

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

860

1076

name, type, domain, protocol, 0,

861

1077

resolve_callback, NULL) == NULL)

862

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

863

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

1078

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

1079

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

864

1081

break;

865

1082

866

1083

case AVAHI_BROWSER_REMOVE:

869

1086

case AVAHI_BROWSER_ALL_FOR_NOW:

870

1087

case AVAHI_BROWSER_CACHE_EXHAUSTED:

871

1088

if(debug){

872

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

1089

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

1090

" searching...\n");

873

1091

}

874

1092

break;

875

1093

}

876

1094

}

877

1095

878

sig_atomic_t quit_now = 0;

879

880

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

881

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

1096

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

1097

static void handle_sigterm(int sig){

882

1098

if(quit_now){

883

1099

return;

884

1100

}

885

1101

quit_now = 1;

1102

signal_received = sig;

886

1103

int old_errno = errno;

1104

/* set main loop to exit */

887

1105

if(mc.simple_poll != NULL){

888

1106

avahi_simple_poll_quit(mc.simple_poll);

889

1107

}

890

1108

errno = old_errno;

891

1109

}

892

1110

1111

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

1112

int ret;

1113

1114

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

1115

if(s < 0){

1116

perror_plus("socket");

1117

return false;

1118

}

1119

strcpy(ifr->ifr_name, ifname);

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

if(ret == -1){

1122

if(debug){

1123

perror_plus("ioctl SIOCGIFFLAGS");

1124

}

1125

return false;

1126

}

1127

return true;

1128

}

1129

1130

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

1131

1132

/* Reject the loopback device */

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1134

if(debug){

1135

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

1136

ifname);

1137

}

1138

return false;

1139

}

1140

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

1141

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

1142

if(debug){

1143

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

1144

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

1145

}

1146

return true;

1147

}

1148

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

1149

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

1150

if(debug){

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1153

}

1154

return false;

1155

}

1156

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

1157

if(ifr->ifr_flags & IFF_NOARP){

1158

if(debug){

1159

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

1160

ifname);

1161

}

1162

return false;

1163

}

1164

1165

/* Accept this device */

1166

if(debug){

1167

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

1168

}

1169

return true;

1170

}

1171

1172

/*

1173

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

1174

* corresponds to an acceptable network device.

1175

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

1176

*/

1177

int good_interface(const struct dirent *if_entry){

1178

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

1179

return 0;

1180

}

1181

1182

struct ifreq ifr;

1183

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

1184

if(debug){

1185

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

1186

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

1187

}

1188

return 0;

1189

}

1190

1191

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

1192

return 0;

1193

}

1194

return 1;

1195

}

1196

1197

/*

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1236

}

1237

return 1;

1238

}

1239

1240

int notdotentries(const struct dirent *direntry){

1241

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

1242

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

1243

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

1244

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

1245

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

1246

return 0;

1247

}

1248

return 1;

1249

}

1250

1251

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

1252

int runnable_hook(const struct dirent *direntry){

1253

int ret;

1254

size_t sret;

1255

struct stat st;

1256

1257

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

1258

/* Empty name? */

1259

return 0;

1260

}

1261

1262

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

1263

"abcdefghijklmnopqrstuvwxyz"

1264

"0123456789"

1265

"_-");

1266

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

1267

/* Contains non-allowed characters */

1268

if(debug){

1269

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

1270

direntry->d_name);

1271

}

1272

return 0;

1273

}

1274

1275

char *fullname = NULL;

1276

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

1277

if(ret < 0){

1278

perror_plus("asprintf");

1279

return 0;

1280

}

1281

1282

ret = stat(fullname, &st);

1283

if(ret == -1){

1284

if(debug){

1285

perror_plus("Could not stat hook");

1286

}

1287

return 0;

1288

}

1289

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

1290

/* Not a regular file */

1291

if(debug){

1292

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

1293

direntry->d_name);

1294

}

1295

return 0;

1296

}

1297

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

1298

/* Not executable */

1299

if(debug){

1300

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

1301

direntry->d_name);

1302

}

1303

return 0;

1304

}

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 1;

1310

}

1311

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1313

int ret;

1314

struct timespec now;

1315

struct timespec waited_time;

1316

intmax_t block_time;

1317

1318

while(true){

1319

if(mc.current_server == NULL){

1320

if (debug){

1321

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

1322

" No timeout!\n");

1323

}

1324

ret = avahi_simple_poll_iterate(s, -1);

1325

} else {

1326

if (debug){

1327

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

1328

" it, or wait\n");

1329

}

1330

/* the current time */

1331

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1332

if(ret == -1){

1333

perror_plus("clock_gettime");

1334

return -1;

1335

}

1336

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

1337

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

1338

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1340

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1342

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

1343

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

1344

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

1345

block_time = ((retry_interval

1346

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

1347

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

1348

1349

if (debug){

1350

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

1351

block_time);

1352

}

1353

1354

if(block_time <= 0){

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1359

if(ret == 0){

1360

avahi_simple_poll_quit(mc.simple_poll);

1361

return 0;

1362

}

1363

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1365

if(ret == -1){

1366

perror_plus("clock_gettime");

1367

return -1;

1368

}

1369

mc.current_server = mc.current_server->next;

1370

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

1371

servers, but don't block */

1372

}

1373

1374

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

1375

}

1376

if(ret != 0){

1377

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

1378

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

1379

}

1380

}

1381

}

1382

}

1383

1384

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

1385

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1391

if(numhooks == -1){

1392

perror_plus("scandir");

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

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

1399

if(ret < 0){

1400

perror_plus("asprintf");

1401

continue;

1402

}

1403

if(debug){

1404

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

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

dup2(devnull, STDIN_FILENO);

1435

close(devnull);

1436

dup2(STDERR_FILENO, STDOUT_FILENO);

1437

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

1438

if(ret == -1){

1439

perror_plus("setenv");

1440

_exit(EX_OSERR);

1441

}

1442

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

1443

if(ret == -1){

1444

perror_plus("setenv");

1445

_exit(EX_OSERR);

1446

}

1447

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

1448

if(ret == -1){

1449

perror_plus("setenv");

1450

_exit(EX_OSERR);

1451

}

1452

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

1453

if(ret == -1){

1454

perror_plus("setenv");

1455

_exit(EX_OSERR);

1456

}

1457

char *delaystring;

1458

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

1459

if(ret == -1){

1460

perror_plus("asprintf");

1461

_exit(EX_OSERR);

1462

}

1463

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

1464

if(ret == -1){

1465

free(delaystring);

1466

perror_plus("setenv");

1467

_exit(EX_OSERR);

1468

}

1469

free(delaystring);

1470

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

1471

perror_plus("execl");

1472

} else {

1473

int status;

1474

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

1475

perror_plus("waitpid");

1476

free(fullname);

1477

continue;

1478

}

1479

if(WIFEXITED(status)){

1480

if(WEXITSTATUS(status) != 0){

1481

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

1482

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

1483

WEXITSTATUS(status));

1484

free(fullname);

1485

continue;

1486

}

1487

} else if(WIFSIGNALED(status)){

1488

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

1489

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

1490

WTERMSIG(status));

1491

free(fullname);

1492

continue;

1493

} else {

1494

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

1495

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

1496

free(fullname);

1497

continue;

1498

}

1499

}

1500

free(fullname);

1501

if(debug){

1502

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

1503

direntry->d_name);

1504

}

1505

}

1506

close(devnull);

1507

}

1508

return true;

1509

}

1510

893

1511

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

894

1512

AvahiSServiceBrowser *sb = NULL;

895

1513

int error;

897

1515

intmax_t tmpmax;

898

1516

char *tmp;

899

1517

int exitcode = EXIT_SUCCESS;

900

const char *interface = "eth0";

1518

const char *interface = "";

901

1519

struct ifreq network;

902

int sd;

1520

int sd = -1;

1521

bool take_down_interface = false;

903

1522

uid_t uid;

904

1523

gid_t gid;

905

char *connect_to = NULL;

906

1524

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

907

1525

bool tempdir_created = false;

908

1526

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

912

1530

bool gnutls_initialized = false;

913

1531

bool gpgme_initialized = false;

914

1532

float delay = 2.5f;

1533

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

1534

retrying the same server again */

915

1535

916

struct sigaction old_sigterm_action;

1536

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

917

1537

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

918

1538

1539

uid = getuid();

1540

gid = getgid();

1541

1542

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

1543

errno = 0;

1544

ret = setgid(gid);

1545

if(ret == -1){

1546

perror_plus("setgid");

1547

}

1548

1549

/* Lower user privileges (temporarily) */

1550

errno = 0;

1551

ret = seteuid(uid);

1552

if(ret == -1){

1553

perror_plus("seteuid");

1554

}

1555

1556

if(quit_now){

1557

goto end;

1558

}

1559

919

1560

{

920

1561

struct argp_option options[] = {

921

1562

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

950

1591

.arg = "SECONDS",

951

1592

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

952

1593

.group = 2 },

1594

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

1595

.arg = "SECONDS",

1596

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

1597

.group = 2 },

1598

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

1599

.arg = "DIR",

1600

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

1601

.group = 2 },

1602

/*

1603

* These reproduce what we would get without ARGP_NO_HELP

1604

*/

1605

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

1606

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

1607

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

1608

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

1609

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

1610

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

953

1611

{ .name = NULL }

954

1612

};

955

1613

956

1614

error_t parse_opt(int key, char *arg,

957

1615

struct argp_state *state){

1616

errno = 0;

958

1617

switch(key){

959

1618

case 128: /* --debug */

960

1619

debug = true;

976

1635

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

977

1636

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

978

1637

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

979

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

980

exit(EXIT_FAILURE);

1638

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

981

1639

}

982

1640

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

983

1641

break;

988

1646

errno = 0;

989

1647

delay = strtof(arg, &tmp);

990

1648

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

991

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

992

exit(EXIT_FAILURE);

993

}

994

break;

995

case ARGP_KEY_ARG:

996

argp_usage(state);

997

case ARGP_KEY_END:

1649

argp_error(state, "Bad delay");

1650

}

1651

case 132: /* --retry */

1652

errno = 0;

1653

retry_interval = strtod(arg, &tmp);

1654

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

1655

or (retry_interval * 1000) > INT_MAX

1656

or retry_interval < 0){

1657

argp_error(state, "Bad retry interval");

1658

}

1659

break;

1660

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

1661

hookdir = arg;

1662

break;

1663

/*

1664

* These reproduce what we would get without ARGP_NO_HELP

1665

*/

1666

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

1667

argp_state_help(state, state->out_stream,

1668

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1669

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1670

case -3: /* --usage */

1671

argp_state_help(state, state->out_stream,

1672

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

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

1677

exit(argp_err_exit_status);

998

1678

break;

999

1679

default:

1000

1680

return ARGP_ERR_UNKNOWN;

1001

1681

}

1002

return 0;

1682

return errno;

1003

1683

}

1004

1684

1005

1685

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

1006

1686

.args_doc = "",

1007

1687

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

1008

1688

" passwords from a Mandos server" };

1009

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

1010

if(ret == ARGP_ERR_UNKNOWN){

1011

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

1012

exitcode = EXIT_FAILURE;

1013

goto end;

1014

}

1689

ret = argp_parse(&argp, argc, argv,

1690

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1691

switch(ret){

1692

case 0:

1693

break;

1694

case ENOMEM:

1695

default:

1696

errno = ret;

1697

perror_plus("argp_parse");

1698

exitcode = EX_OSERR;

1699

goto end;

1700

case EINVAL:

1701

exitcode = EX_USAGE;

1702

goto end;

1703

}

1704

}

1705

1706

{

1707

/* Work around Debian bug #633582:

1708

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

1709

1710

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

1715

} else {

1716

struct stat st;

1717

1718

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

1719

int seckey_fd = open(seckey, O_RDONLY);

1720

if(seckey_fd == -1){

1721

perror_plus("open");

1722

} else {

1723

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

1724

if(ret == -1){

1725

perror_plus("fstat");

1726

} else {

1727

if(S_ISREG(st.st_mode)

1728

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

1729

ret = fchown(seckey_fd, uid, gid);

1730

if(ret == -1){

1731

perror_plus("fchown");

1732

}

1733

}

1734

}

1735

TEMP_FAILURE_RETRY(close(seckey_fd));

1736

}

1737

}

1738

1739

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

1740

int pubkey_fd = open(pubkey, O_RDONLY);

1741

if(pubkey_fd == -1){

1742

perror_plus("open");

1743

} else {

1744

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

1745

if(ret == -1){

1746

perror_plus("fstat");

1747

} else {

1748

if(S_ISREG(st.st_mode)

1749

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

1750

ret = fchown(pubkey_fd, uid, gid);

1751

if(ret == -1){

1752

perror_plus("fchown");

1753

}

1754

}

1755

}

1756

TEMP_FAILURE_RETRY(close(pubkey_fd));

1757

}

1758

}

1759

1760

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

1765

}

1766

}

1767

}

1768

1769

/* Run network hooks */

1770

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

1771

goto end;

1015

1772

}

1016

1773

1017

1774

if(not debug){

1018

1775

avahi_set_log_function(empty_log);

1019

1776

}

1020

1777

1778

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

1779

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

if(ret >= 1){

1790

/* Pick the first interface returned */

1791

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

1792

if(debug){

1793

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

1794

}

1795

if(interface == NULL){

1796

perror_plus("malloc");

1797

free(direntries);

1798

exitcode = EXIT_FAILURE;

1799

goto end;

1800

}

1801

free(direntries);

1802

} else {

1803

free(direntries);

1804

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

1805

exitcode = EXIT_FAILURE;

1806

goto end;

1807

}

1808

}

1809

1021

1810

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

1022

1811

from the signal handler */

1023

1812

/* Initialize the pseudo-RNG for Avahi */

1024

1813

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

1025

1814

mc.simple_poll = avahi_simple_poll_new();

1026

1815

if(mc.simple_poll == NULL){

1027

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

1028

exitcode = EXIT_FAILURE;

1816

fprintf_plus(stderr,

1817

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

1818

exitcode = EX_UNAVAILABLE;

1029

1819

goto end;

1030

1820

}

1031

1821

1032

1822

sigemptyset(&sigterm_action.sa_mask);

1033

1823

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

1034

1824

if(ret == -1){

1035

perror("sigaddset");

1036

exitcode = EXIT_FAILURE;

1825

perror_plus("sigaddset");

1826

exitcode = EX_OSERR;

1037

1827

goto end;

1038

1828

}

1039

1829

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

1040

1830

if(ret == -1){

1041

perror("sigaddset");

1042

exitcode = EXIT_FAILURE;

1831

perror_plus("sigaddset");

1832

exitcode = EX_OSERR;

1043

1833

goto end;

1044

1834

}

1045

1835

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

1046

1836

if(ret == -1){

1047

perror("sigaddset");

1048

exitcode = EXIT_FAILURE;

1049

goto end;

1050

}

1051

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

1052

if(ret == -1){

1053

perror("sigaction");

1054

exitcode = EXIT_FAILURE;

1055

goto end;

1056

}

1837

perror_plus("sigaddset");

1838

exitcode = EX_OSERR;

1839

goto end;

1840

}

1841

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

1842

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

1843

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

1844

*/

1845

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

1846

if(ret == -1){

1847

perror_plus("sigaction");

1848

return EX_OSERR;

1849

}

1850

if(old_sigterm_action.sa_handler != SIG_IGN){

1851

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

1852

if(ret == -1){

1853

perror_plus("sigaction");

1854

exitcode = EX_OSERR;

1855

goto end;

1856

}

1857

}

1858

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

1859

if(ret == -1){

1860

perror_plus("sigaction");

1861

return EX_OSERR;

1862

}

1863

if(old_sigterm_action.sa_handler != SIG_IGN){

1864

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

1865

if(ret == -1){

1866

perror_plus("sigaction");

1867

exitcode = EX_OSERR;

1868

goto end;

1869

}

1870

}

1871

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

1872

if(ret == -1){

1873

perror_plus("sigaction");

1874

return EX_OSERR;

1875

}

1876

if(old_sigterm_action.sa_handler != SIG_IGN){

1877

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

1878

if(ret == -1){

1879

perror_plus("sigaction");

1880

exitcode = EX_OSERR;

1881

goto end;

1882

}

1883

}

1057

1884

1058

1885

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

1059

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

1886

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

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1888

if(if_index == 0){

1889

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

1890

exitcode = EX_UNAVAILABLE;

1891

goto end;

1892

}

1893

1894

if(quit_now){

1895

goto end;

1896

}

1897

1898

/* Re-raise priviliges */

1899

errno = 0;

1900

ret = seteuid(0);

1901

if(ret == -1){

1902

perror_plus("seteuid");

1903

}

1904

1060

1905

#ifdef __linux__

1061

1906

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1062

messages to mess up the prompt */

1907

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

1063

1908

ret = klogctl(8, NULL, 5);

1064

1909

bool restore_loglevel = true;

1065

1910

if(ret == -1){

1066

1911

restore_loglevel = false;

1067

perror("klogctl");

1912

perror_plus("klogctl");

1068

1913

}

1069

1914

#endif /* __linux__ */

1070

1915

1071

1916

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1072

1917

if(sd < 0){

1073

perror("socket");

1074

exitcode = EXIT_FAILURE;

1918

perror_plus("socket");

1919

exitcode = EX_OSERR;

1075

1920

#ifdef __linux__

1076

1921

if(restore_loglevel){

1077

1922

ret = klogctl(7, NULL, 0);

1078

1923

if(ret == -1){

1079

perror("klogctl");

1924

perror_plus("klogctl");

1080

1925

}

1081

1926

}

1082

1927

#endif /* __linux__ */

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1083

1934

goto end;

1084

1935

}

1085

1936

strcpy(network.ifr_name, interface);

1086

1937

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

1087

1938

if(ret == -1){

1088

perror("ioctl SIOCGIFFLAGS");

1939

perror_plus("ioctl SIOCGIFFLAGS");

1089

1940

#ifdef __linux__

1090

1941

if(restore_loglevel){

1091

1942

ret = klogctl(7, NULL, 0);

1092

1943

if(ret == -1){

1093

perror("klogctl");

1944

perror_plus("klogctl");

1094

1945

}

1095

1946

}

1096

1947

#endif /* __linux__ */

1097

exitcode = EXIT_FAILURE;

1948

exitcode = EX_OSERR;

1949

/* Lower privileges */

1950

errno = 0;

1951

ret = seteuid(uid);

1952

if(ret == -1){

1953

perror_plus("seteuid");

1954

}

1098

1955

goto end;

1099

1956

}

1100

1957

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

1101

1958

network.ifr_flags |= IFF_UP;

1959

take_down_interface = true;

1102

1960

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

1103

1961

if(ret == -1){

1104

perror("ioctl SIOCSIFFLAGS");

1105

exitcode = EXIT_FAILURE;

1962

take_down_interface = false;

1963

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1964

exitcode = EX_OSERR;

1106

1965

#ifdef __linux__

1107

1966

if(restore_loglevel){

1108

1967

ret = klogctl(7, NULL, 0);

1109

1968

if(ret == -1){

1110

perror("klogctl");

1969

perror_plus("klogctl");

1111

1970

}

1112

1971

}

1113

1972

#endif /* __linux__ */

1973

/* Lower privileges */

1974

errno = 0;

1975

ret = seteuid(uid);

1976

if(ret == -1){

1977

perror_plus("seteuid");

1978

}

1114

1979

goto end;

1115

1980

}

1116

1981

}

1117

/* sleep checking until interface is running */

1982

/* Sleep checking until interface is running.

1983

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

1118

1984

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

1119

1985

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

1120

1986

if(ret == -1){

1121

perror("ioctl SIOCGIFFLAGS");

1987

perror_plus("ioctl SIOCGIFFLAGS");

1122

1988

} else if(network.ifr_flags & IFF_RUNNING){

1123

1989

break;

1124

1990

}

1125

1991

struct timespec sleeptime = { .tv_nsec = 250000000 };

1126

1992

ret = nanosleep(&sleeptime, NULL);

1127

1993

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

1128

perror("nanosleep");

1994

perror_plus("nanosleep");

1129

1995

}

1130

1996

}

1131

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

1132

if(ret == -1){

1133

perror("close");

1997

if(not take_down_interface){

1998

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

1999

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

2000

if(ret == -1){

2001

perror_plus("close");

2002

}

1134

2003

}

1135

2004

#ifdef __linux__

1136

2005

if(restore_loglevel){

1137

2006

/* Restores kernel loglevel to default */

1138

2007

ret = klogctl(7, NULL, 0);

1139

2008

if(ret == -1){

1140

perror("klogctl");

2009

perror_plus("klogctl");

1141

2010

}

1142

2011

}

1143

2012

#endif /* __linux__ */

1144

}

1145

1146

uid = getuid();

1147

gid = getgid();

1148

1149

errno = 0;

1150

setgid(gid);

1151

if(ret == -1){

1152

perror("setgid");

1153

}

1154

1155

ret = setuid(uid);

1156

if(ret == -1){

1157

perror("setuid");

2013

/* Lower privileges */

2014

errno = 0;

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

2019

}

2020

}

2021

2022

if(quit_now){

2023

goto end;

1158

2024

}

1159

2025

1160

2026

ret = init_gnutls_global(pubkey, seckey);

1161

2027

if(ret == -1){

1162

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

1163

exitcode = EXIT_FAILURE;

2028

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

2029

exitcode = EX_UNAVAILABLE;

1164

2030

goto end;

1165

2031

} else {

1166

2032

gnutls_initialized = true;

1167

2033

}

1168

2034

2035

if(quit_now){

2036

goto end;

2037

}

2038

1169

2039

if(mkdtemp(tempdir) == NULL){

1170

perror("mkdtemp");

2040

perror_plus("mkdtemp");

1171

2041

goto end;

1172

2042

}

1173

2043

tempdir_created = true;

1174

2044

2045

if(quit_now){

2046

goto end;

2047

}

2048

1175

2049

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

1176

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

1177

exitcode = EXIT_FAILURE;

2050

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

2051

exitcode = EX_UNAVAILABLE;

1178

2052

goto end;

1179

2053

} else {

1180

2054

gpgme_initialized = true;

1181

2055

}

1182

2056

1183

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

1184

if_index = (AvahiIfIndex) if_nametoindex(interface);

1185

if(if_index == 0){

1186

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

1187

exitcode = EXIT_FAILURE;

1188

goto end;

1189

}

2057

if(quit_now){

2058

goto end;

1190

2059

}

1191

2060

1192

2061

if(connect_to != NULL){

1194

2063

/* (Mainly meant for debugging) */

1195

2064

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

1196

2065

if(address == NULL){

1197

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

1198

exitcode = EXIT_FAILURE;

1199

goto end;

1200

}

2066

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

2067

exitcode = EX_USAGE;

2068

goto end;

2069

}

2070

2071

if(quit_now){

2072

goto end;

2073

}

2074

1201

2075

uint16_t port;

1202

2076

errno = 0;

1203

2077

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

1204

2078

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

1205

2079

or tmpmax != (uint16_t)tmpmax){

1206

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

1207

exitcode = EXIT_FAILURE;

1208

goto end;

1209

}

2080

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

2081

exitcode = EX_USAGE;

2082

goto end;

2083

}

2084

2085

if(quit_now){

2086

goto end;

2087

}

2088

1210

2089

port = (uint16_t)tmpmax;

1211

2090

*address = '\0';

1212

address = connect_to;

1213

2091

/* Colon in address indicates IPv6 */

1214

2092

int af;

1215

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

2093

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

1216

2094

af = AF_INET6;

2095

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

2096

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

2097

{

2098

connect_to++;

2099

address[-1] = '\0';

2100

}

1217

2101

} else {

1218

2102

af = AF_INET;

1219

2103

}

1220

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

1221

if(ret < 0){

1222

exitcode = EXIT_FAILURE;

1223

} else {

2104

address = connect_to;

2105

2106

if(quit_now){

2107

goto end;

2108

}

2109

2110

while(not quit_now){

2111

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

2112

if(quit_now or ret == 0){

2113

break;

2114

}

2115

if(debug){

2116

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

2117

(int)retry_interval);

2118

}

2119

sleep((int)retry_interval);

2120

}

2121

2122

if (not quit_now){

1224

2123

exitcode = EXIT_SUCCESS;

1225

2124

}

1226

goto end;

1227

}

1228

2125

2126

goto end;

2127

}

2128

2129

if(quit_now){

2130

goto end;

2131

}

2132

1229

2133

{

1230

2134

AvahiServerConfig config;

1231

2135

/* Do not publish any local Zeroconf records */

1246

2150

1247

2151

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

1248

2152

if(mc.server == NULL){

1249

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

1250

avahi_strerror(error));

1251

exitcode = EXIT_FAILURE;

2153

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

2154

avahi_strerror(error));

2155

exitcode = EX_UNAVAILABLE;

2156

goto end;

2157

}

2158

2159

if(quit_now){

1252

2160

goto end;

1253

2161

}

1254

2162

1257

2165

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1258

2166

NULL, 0, browse_callback, NULL);

1259

2167

if(sb == NULL){

1260

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

1261

avahi_strerror(avahi_server_errno(mc.server)));

1262

exitcode = EXIT_FAILURE;

2168

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

2169

avahi_strerror(avahi_server_errno(mc.server)));

2170

exitcode = EX_UNAVAILABLE;

2171

goto end;

2172

}

2173

2174

if(quit_now){

1263

2175

goto end;

1264

2176

}

1265

2177

1266

2178

/* Run the main loop */

1267

2179

1268

2180

if(debug){

1269

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

1270

}

1271

1272

avahi_simple_poll_loop(mc.simple_poll);

2181

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

2182

}

2183

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2186

if(debug){

2187

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

2188

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

2189

}

1273

2190

1274

2191

end:

1275

2192

1276

2193

if(debug){

1277

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

2194

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

1278

2195

}

1279

2196

1280

2197

/* Cleanup things */

1297

2214

gpgme_release(mc.ctx);

1298

2215

}

1299

2216

1300

/* Removes the temp directory used by GPGME */

2217

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

2218

has seen */

2219

if(mc.current_server != NULL){

2220

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

2221

while(mc.current_server != NULL){

2222

server *next = mc.current_server->next;

2223

free(mc.current_server);

2224

mc.current_server = next;

2225

}

2226

}

2227

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

2232

{

2233

errno = 0;

2234

ret = seteuid(0);

2235

if(ret == -1){

2236

perror_plus("seteuid");

2237

}

2238

2239

/* Take down the network interface */

2240

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

2241

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

2242

if(ret == -1){

2243

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

2245

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

2246

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

2247

if(ret == -1){

2248

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2249

}

2250

}

2251

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

2252

if(ret == -1){

2253

perror_plus("close");

2254

}

2255

}

2256

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2263

2264

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

1301

2265

if(tempdir_created){

1302

DIR *d;

1303

struct dirent *direntry;

1304

d = opendir(tempdir);

1305

if(d == NULL){

1306

if(errno != ENOENT){

1307

perror("opendir");

1308

}

1309

} else {

1310

while(true){

1311

direntry = readdir(d);

1312

if(direntry == NULL){

1313

break;

1314

}

1315

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

1316

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

1317

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

1318

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

1319

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

1320

continue;

1321

}

2266

struct dirent **direntries = NULL;

2267

struct dirent *direntry = NULL;

2268

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

2269

alphasort);

2270

if (numentries > 0){

2271

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

2272

direntry = direntries[i];

1322

2273

char *fullname = NULL;

1323

2274

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

1324

2275

direntry->d_name);

1325

2276

if(ret < 0){

1326

perror("asprintf");

2277

perror_plus("asprintf");

1327

2278

continue;

1328

2279

}

1329

2280

ret = remove(fullname);

1330

2281

if(ret == -1){

1331

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

1332

strerror(errno));

2282

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

2283

strerror(errno));

1333

2284

}

1334

2285

free(fullname);

1335

2286

}

1336

closedir(d);

2287

}

2288

2289

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

2290

free(direntries);

2291

if (numentries == -1){

2292

perror_plus("scandir");

1337

2293

}

1338

2294

ret = rmdir(tempdir);

1339

2295

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

1340

perror("rmdir");

1341

}

2296

perror_plus("rmdir");

2297

}

2298

}

2299

2300

if(quit_now){

2301

sigemptyset(&old_sigterm_action.sa_mask);

2302

old_sigterm_action.sa_handler = SIG_DFL;

2303

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2304

&old_sigterm_action,

2305

NULL));

2306

if(ret == -1){

2307

perror_plus("sigaction");

2308

}

2309

do {

2310

ret = raise(signal_received);

2311

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

2312

if(ret != 0){

2313

perror_plus("raise");

2314

abort();

2315

}

2316

TEMP_FAILURE_RETRY(pause());

1342

2317

}

1343

2318

1344

2319

return exitcode;