/mandos/trunk : revision 369

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* "browse_callback", and parts of "main".

10

*

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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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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, 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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*/

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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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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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78

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

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argp_state, struct argp,

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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() */

90

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

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85

92

86

#ifdef __linux__

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87

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

111

105

init_gnutls_session(),

112

106

GNUTLS_* */

113

107

#include <gnutls/openpgp.h>

114

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

108

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

116

110

117

111

/* GPGME */

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112

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

126

120

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

127

121

#define SECKEY "seckey.txt"

128

122

#define PUBKEY "pubkey.txt"

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

130

123

131

124

bool debug = false;

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125

static const char mandos_protocol_version[] = "1";

133

126

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";

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

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;

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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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128

150

129

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

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130

typedef struct {

156

135

gnutls_dh_params_t dh_params;

157

136

const char *priority;

158

137

gpgme_ctx_t ctx;

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server *current_server;

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138

} mandos_context;

161

139

162

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

163

141

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

164

142

.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;

170

171

/* Function to use when printing errors */

172

void perror_plus(const char *print_text){

173

int e = errno;

174

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

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program_invocation_short_name);

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errno = e;

177

perror(print_text);

178

}

179

180

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

181

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

182

va_list ap;

183

va_start (ap, format);

184

185

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

186

program_invocation_short_name));

187

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

188

}

143

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

189

144

190

145

/*

191

146

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

193

148

* "buffer_length" is how much is already used.

194

149

*/

195

150

size_t incbuffer(char **buffer, size_t buffer_length,

196

size_t buffer_capacity){

151

size_t buffer_capacity){

197

152

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

153

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

199

154

if(buffer == NULL){

204

159

return buffer_capacity;

205

160

}

206

161

207

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

208

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

209

int af){

210

int ret;

211

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

212

if(new_server == NULL){

213

perror_plus("malloc");

214

return false;

215

}

216

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

217

.port = port,

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.if_index = if_index,

219

.af = af };

220

if(new_server->ip == NULL){

221

perror_plus("strdup");

222

return false;

223

}

224

/* Special case of first server */

225

if (mc.current_server == NULL){

226

new_server->next = new_server;

227

new_server->prev = new_server;

228

mc.current_server = new_server;

229

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

230

} else {

231

new_server->next = mc.current_server;

232

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

233

new_server->prev->next = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

240

}

241

return true;

242

}

243

244

162

/*

245

163

* Initialize GPGME.

246

164

*/

247

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

248

const char *tempdir){

165

static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

249

167

gpgme_error_t rc;

250

168

gpgme_engine_info_t engine_info;

251

169

260

178

261

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

262

180

if(fd == -1){

263

perror_plus("open");

181

perror("open");

264

182

return false;

265

183

}

266

184

267

185

rc = gpgme_data_new_from_fd(&pgp_data, fd);

268

186

if(rc != GPG_ERR_NO_ERROR){

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

187

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

188

gpgme_strsource(rc), gpgme_strerror(rc));

271

189

return false;

272

190

}

273

191

274

192

rc = gpgme_op_import(mc.ctx, pgp_data);

275

193

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

194

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

195

gpgme_strsource(rc), gpgme_strerror(rc));

278

196

return false;

279

197

}

280

198

281

199

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

282

200

if(ret == -1){

283

perror_plus("close");

201

perror("close");

284

202

}

285

203

gpgme_data_release(pgp_data);

286

204

return true;

287

205

}

288

206

289

207

if(debug){

290

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

208

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

291

209

}

292

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/* Init GPGME */

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212

gpgme_check_version(NULL);

295

213

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

296

214

if(rc != GPG_ERR_NO_ERROR){

297

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

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gpgme_strsource(rc), gpgme_strerror(rc));

215

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

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gpgme_strsource(rc), gpgme_strerror(rc));

299

217

return false;

300

218

}

301

219

302

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

220

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

303

221

rc = gpgme_get_engine_info(&engine_info);

304

222

if(rc != GPG_ERR_NO_ERROR){

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

223

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

224

gpgme_strsource(rc), gpgme_strerror(rc));

307

225

return false;

308

226

}

309

227

while(engine_info != NULL){

315

233

engine_info = engine_info->next;

316

234

}

317

235

if(engine_info == NULL){

318

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

319

tempdir);

236

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

320

237

return false;

321

238

}

322

239

323

240

/* Create new GPGME "context" */

324

241

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

325

242

if(rc != GPG_ERR_NO_ERROR){

326

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

327

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

328

gpgme_strerror(rc));

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

329

245

return false;

330

246

}

331

247

350

266

ssize_t plaintext_length = 0;

351

267

352

268

if(debug){

353

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

269

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

354

270

}

355

271

356

272

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

357

273

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

358

274

0);

359

275

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

362

278

return -1;

363

279

}

364

280

365

281

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

366

282

rc = gpgme_data_new(&dh_plain);

367

283

if(rc != GPG_ERR_NO_ERROR){

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

371

286

gpgme_data_release(dh_crypto);

372

287

return -1;

373

288

}

376

291

data buffer */

377

292

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

378

293

if(rc != GPG_ERR_NO_ERROR){

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

381

296

plaintext_length = -1;

382

297

if(debug){

383

298

gpgme_decrypt_result_t result;

384

299

result = gpgme_op_decrypt_result(mc.ctx);

385

300

if(result == NULL){

386

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

301

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

387

302

} else {

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

303

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

304

result->unsupported_algorithm);

305

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

306

result->wrong_key_usage);

392

307

if(result->file_name != NULL){

393

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

308

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

394

309

}

395

310

gpgme_recipient_t recipient;

396

311

recipient = result->recipients;

397

312

while(recipient != NULL){

398

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

399

gpgme_pubkey_algo_name

400

(recipient->pubkey_algo));

401

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

402

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

403

recipient->status == GPG_ERR_NO_SECKEY

404

? "No" : "Yes");

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");

405

319

recipient = recipient->next;

406

320

}

407

321

}

410

324

}

411

325

412

326

if(debug){

413

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

327

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

414

328

}

415

329

416

330

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

417

331

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

418

perror_plus("gpgme_data_seek");

332

perror("gpgme_data_seek");

419

333

plaintext_length = -1;

420

334

goto decrypt_end;

421

335

}

423

337

*plaintext = NULL;

424

338

while(true){

425

339

plaintext_capacity = incbuffer(plaintext,

426

(size_t)plaintext_length,

427

plaintext_capacity);

340

(size_t)plaintext_length,

341

plaintext_capacity);

428

342

if(plaintext_capacity == 0){

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

343

perror("incbuffer");

344

plaintext_length = -1;

345

goto decrypt_end;

432

346

}

433

347

434

348

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

439

353

break;

440

354

}

441

355

if(ret < 0){

442

perror_plus("gpgme_data_read");

356

perror("gpgme_data_read");

443

357

plaintext_length = -1;

444

358

goto decrypt_end;

445

359

}

447

361

}

448

362

449

363

if(debug){

450

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

364

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

451

365

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

452

366

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

453

367

}

475

389

/* GnuTLS log function callback */

476

390

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

477

391

const char* string){

478

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

392

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

479

393

}

480

394

481

395

static int init_gnutls_global(const char *pubkeyfilename,

483

397

int ret;

484

398

485

399

if(debug){

486

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

400

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

487

401

}

488

402

489

403

ret = gnutls_global_init();

490

404

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

405

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

406

safer_gnutls_strerror(ret));

493

407

return -1;

494

408

}

495

409

502

416

}

503

417

504

418

/* OpenPGP credentials */

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

419

gnutls_certificate_allocate_credentials(&mc.cred);

506

420

if(ret != GNUTLS_E_SUCCESS){

507

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

508

safer_gnutls_strerror(ret));

421

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

422

from

423

-Wunreachable-code

424

*/

425

safer_gnutls_strerror(ret));

509

426

gnutls_global_deinit();

510

427

return -1;

511

428

}

512

429

513

430

if(debug){

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

431

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

432

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

433

seckeyfilename);

518

434

}

519

435

520

436

ret = gnutls_certificate_set_openpgp_key_file

521

437

(mc.cred, pubkeyfilename, seckeyfilename,

522

438

GNUTLS_OPENPGP_FMT_BASE64);

523

439

if(ret != GNUTLS_E_SUCCESS){

524

fprintf_plus(stderr,

525

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

526

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

527

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

528

safer_gnutls_strerror(ret));

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));

529

445

goto globalfail;

530

446

}

531

447

532

448

/* GnuTLS server initialization */

533

449

ret = gnutls_dh_params_init(&mc.dh_params);

534

450

if(ret != GNUTLS_E_SUCCESS){

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

451

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

452

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

538

453

goto globalfail;

539

454

}

540

455

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

541

456

if(ret != GNUTLS_E_SUCCESS){

542

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

543

safer_gnutls_strerror(ret));

457

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

458

safer_gnutls_strerror(ret));

544

459

goto globalfail;

545

460

}

546

461

561

476

/* GnuTLS session creation */

562

477

do {

563

478

ret = gnutls_init(session, GNUTLS_SERVER);

564

if(quit_now){

565

return -1;

566

}

567

479

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

568

480

if(ret != GNUTLS_E_SUCCESS){

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

481

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

482

safer_gnutls_strerror(ret));

572

483

}

573

484

574

485

{

575

486

const char *err;

576

487

do {

577

488

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

578

if(quit_now){

579

gnutls_deinit(*session);

580

return -1;

581

}

582

489

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

583

490

if(ret != GNUTLS_E_SUCCESS){

584

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

585

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

586

safer_gnutls_strerror(ret));

491

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

492

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

493

safer_gnutls_strerror(ret));

587

494

gnutls_deinit(*session);

588

495

return -1;

589

496

}

592

499

do {

593

500

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

594

501

mc.cred);

595

if(quit_now){

596

gnutls_deinit(*session);

597

return -1;

598

}

599

502

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

600

503

if(ret != GNUTLS_E_SUCCESS){

601

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

602

safer_gnutls_strerror(ret));

504

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

505

safer_gnutls_strerror(ret));

603

506

gnutls_deinit(*session);

604

507

return -1;

605

508

}

616

519

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

617

520

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

618

521

522

sig_atomic_t quit_now = 0;

523

int signal_received = 0;

524

619

525

/* Called when a Mandos server is found */

620

526

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

621

527

AvahiIfIndex if_index,

627

533

struct sockaddr_in6 in6;

628

534

} to;

629

535

char *buffer = NULL;

630

char *decrypted_buffer = NULL;

536

char *decrypted_buffer;

631

537

size_t buffer_length = 0;

632

538

size_t buffer_capacity = 0;

633

539

size_t written;

634

int retval = -1;

540

int retval = 0;

635

541

gnutls_session_t session;

636

542

int pf; /* Protocol family */

637

543

638

errno = 0;

639

640

544

if(quit_now){

641

errno = EINTR;

642

545

return -1;

643

546

}

644

547

650

553

pf = PF_INET;

651

554

break;

652

555

default:

653

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

654

errno = EINVAL;

556

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

655

557

return -1;

656

558

}

657

559

661

563

}

662

564

663

565

if(debug){

664

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

665

PRIu16 "\n", ip, port);

566

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

567

"\n", ip, port);

666

568

}

667

569

668

570

tcp_sd = socket(pf, SOCK_STREAM, 0);

669

571

if(tcp_sd < 0){

670

int e = errno;

671

perror_plus("socket");

672

errno = e;

572

perror("socket");

573

retval = -1;

673

574

goto mandos_end;

674

575

}

675

576

676

577

if(quit_now){

677

errno = EINTR;

678

578

goto mandos_end;

679

579

}

680

580

687

587

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

688

588

}

689

589

if(ret < 0 ){

690

int e = errno;

691

perror_plus("inet_pton");

692

errno = e;

590

perror("inet_pton");

591

retval = -1;

693

592

goto mandos_end;

694

593

}

695

594

if(ret == 0){

696

int e = errno;

697

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

698

errno = e;

595

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

596

retval = -1;

699

597

goto mandos_end;

700

598

}

701

599

if(af == AF_INET6){

705

603

706

604

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

605

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

708

-Wunreachable-code*/

606

-Wunreachable-code*/

709

607

if(if_index == AVAHI_IF_UNSPEC){

710

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

711

" incomplete without a network interface\n");

712

errno = EINVAL;

608

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

609

" without a network interface\n");

610

retval = -1;

713

611

goto mandos_end;

714

612

}

715

613

/* Set the network interface number as scope */

722

620

}

723

621

724

622

if(quit_now){

725

errno = EINTR;

726

623

goto mandos_end;

727

624

}

728

625

730

627

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

731

628

char interface[IF_NAMESIZE];

732

629

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

733

perror_plus("if_indextoname");

630

perror("if_indextoname");

734

631

} else {

735

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

736

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

632

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

633

ip, interface, port);

737

634

}

738

635

} else {

739

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

740

ip, port);

636

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

637

port);

741

638

}

742

639

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

640

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

647

sizeof(addrstr));

751

648

}

752

649

if(pcret == NULL){

753

perror_plus("inet_ntop");

650

perror("inet_ntop");

754

651

} else {

755

652

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

756

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

653

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

757

654

}

758

655

}

759

656

}

760

657

761

658

if(quit_now){

762

errno = EINTR;

763

659

goto mandos_end;

764

660

}

765

661

769

665

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

770

666

}

771

667

if(ret < 0){

772

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

773

int e = errno;

774

perror_plus("connect");

775

errno = e;

776

}

668

perror("connect");

669

retval = -1;

777

670

goto mandos_end;

778

671

}

779

672

780

673

if(quit_now){

781

errno = EINTR;

782

674

goto mandos_end;

783

675

}

784

676

787

679

while(true){

788

680

size_t out_size = strlen(out);

789

681

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

790

out_size - written));

682

out_size - written));

791

683

if(ret == -1){

792

int e = errno;

793

perror_plus("write");

794

errno = e;

684

perror("write");

685

retval = -1;

795

686

goto mandos_end;

796

687

}

797

688

written += (size_t)ret;

807

698

}

808

699

809

700

if(quit_now){

810

errno = EINTR;

811

701

goto mandos_end;

812

702

}

813

703

}

814

704

815

705

if(debug){

816

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

706

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

817

707

}

818

708

819

709

if(quit_now){

820

errno = EINTR;

821

710

goto mandos_end;

822

711

}

823

712

824

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

825

713

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

826

714

827

715

if(quit_now){

828

errno = EINTR;

829

716

goto mandos_end;

830

717

}

831

718

832

719

do {

833

720

ret = gnutls_handshake(session);

834

721

if(quit_now){

835

errno = EINTR;

836

722

goto mandos_end;

837

723

}

838

724

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

839

725

840

726

if(ret != GNUTLS_E_SUCCESS){

841

727

if(debug){

842

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

728

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

843

729

gnutls_perror(ret);

844

730

}

845

errno = EPROTO;

731

retval = -1;

846

732

goto mandos_end;

847

733

}

848

734

849

735

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

850

736

851

737

if(debug){

852

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

853

" %s\n", ip);

738

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

739

ip);

854

740

}

855

741

856

742

while(true){

857

743

858

744

if(quit_now){

859

errno = EINTR;

860

745

goto mandos_end;

861

746

}

862

747

863

748

buffer_capacity = incbuffer(&buffer, buffer_length,

864

buffer_capacity);

749

buffer_capacity);

865

750

if(buffer_capacity == 0){

866

int e = errno;

867

perror_plus("incbuffer");

868

errno = e;

751

perror("incbuffer");

752

retval = -1;

869

753

goto mandos_end;

870

754

}

871

755

872

756

if(quit_now){

873

errno = EINTR;

874

757

goto mandos_end;

875

758

}

876

759

889

772

ret = gnutls_handshake(session);

890

773

891

774

if(quit_now){

892

errno = EINTR;

893

775

goto mandos_end;

894

776

}

895

777

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

896

778

if(ret < 0){

897

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

898

"***\n");

779

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

899

780

gnutls_perror(ret);

900

errno = EPROTO;

781

retval = -1;

901

782

goto mandos_end;

902

783

}

903

784

break;

904

785

default:

905

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

906

" encrypted session with Mandos server\n");

786

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

787

" encrypted session with Mandos server\n");

788

retval = -1;

907

789

gnutls_bye(session, GNUTLS_SHUT_RDWR);

908

errno = EIO;

909

790

goto mandos_end;

910

791

}

911

792

} else {

914

795

}

915

796

916

797

if(debug){

917

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

918

}

919

920

if(quit_now){

921

errno = EINTR;

922

goto mandos_end;

923

}

924

925

do {

926

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

927

if(quit_now){

928

errno = EINTR;

929

goto mandos_end;

930

}

931

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

798

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

799

}

800

801

if(quit_now){

802

goto mandos_end;

803

}

804

805

gnutls_bye(session, GNUTLS_SHUT_RDWR);

806

807

if(quit_now){

808

goto mandos_end;

809

}

932

810

933

811

if(buffer_length > 0){

934

812

ssize_t decrypted_buffer_size;

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

813

decrypted_buffer_size = pgp_packet_decrypt(buffer,

814

buffer_length,

936

815

&decrypted_buffer);

937

816

if(decrypted_buffer_size >= 0){

938

817

939

818

written = 0;

940

819

while(written < (size_t) decrypted_buffer_size){

941

820

if(quit_now){

942

errno = EINTR;

943

821

goto mandos_end;

944

822

}

945

823

947

825

(size_t)decrypted_buffer_size - written,

948

826

stdout);

949

827

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

950

int e = errno;

951

828

if(debug){

952

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

953

strerror(errno));

829

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

830

strerror(errno));

954

831

}

955

errno = e;

956

goto mandos_end;

832

retval = -1;

833

break;

957

834

}

958

835

written += (size_t)ret;

959

836

}

960

retval = 0;

837

free(decrypted_buffer);

838

} else {

839

retval = -1;

961

840

}

841

} else {

842

retval = -1;

962

843

}

963

844

964

845

/* Shutdown procedure */

965

846

966

847

mandos_end:

967

{

968

int e = errno;

969

free(decrypted_buffer);

970

free(buffer);

971

if(tcp_sd >= 0){

972

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

973

}

974

if(ret == -1){

975

if(e == 0){

976

e = errno;

977

}

978

perror_plus("close");

979

}

980

gnutls_deinit(session);

981

errno = e;

982

if(quit_now){

983

errno = EINTR;

984

retval = -1;

985

}

848

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

852

if(ret == -1){

853

perror("close");

854

}

855

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

986

858

}

987

859

return retval;

988

860

}

1013

885

switch(event){

1014

886

default:

1015

887

case AVAHI_RESOLVER_FAILURE:

1016

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

1017

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

1018

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

888

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

889

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

890

avahi_strerror(avahi_server_errno(mc.server)));

1020

891

break;

1021

892

1022

893

case AVAHI_RESOLVER_FOUND:

1024

895

char ip[AVAHI_ADDRESS_STR_MAX];

1025

896

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

1026

897

if(debug){

1027

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

1028

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

1029

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

898

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

899

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

900

ip, (intmax_t)interface, port);

1030

901

}

1031

902

int ret = start_mandos_communication(ip, port, interface,

1032

903

avahi_proto_to_af(proto));

1033

904

if(ret == 0){

1034

905

avahi_simple_poll_quit(mc.simple_poll);

1035

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1038

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

1039

" list\n", name);

1040

}

1041

906

}

1042

907

}

1043

908

}

1067

932

default:

1068

933

case AVAHI_BROWSER_FAILURE:

1069

934

1070

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

935

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

936

avahi_strerror(avahi_server_errno(mc.server)));

1072

937

avahi_simple_poll_quit(mc.simple_poll);

1073

938

return;

1074

939

1081

946

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

1082

947

name, type, domain, protocol, 0,

1083

948

resolve_callback, NULL) == NULL)

1084

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

1085

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

949

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

950

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

1087

951

break;

1088

952

1089

953

case AVAHI_BROWSER_REMOVE:

1092

956

case AVAHI_BROWSER_ALL_FOR_NOW:

1093

957

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1094

958

if(debug){

1095

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

1096

" searching...\n");

959

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

1097

960

}

1098

961

break;

1099

962

}

1100

963

}

1101

964

1102

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

965

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

1103

966

static void handle_sigterm(int sig){

1104

967

if(quit_now){

1105

968

return;

1107

970

quit_now = 1;

1108

971

signal_received = sig;

1109

972

int old_errno = errno;

1110

/* set main loop to exit */

1111

973

if(mc.simple_poll != NULL){

1112

974

avahi_simple_poll_quit(mc.simple_poll);

1113

975

}

1114

976

errno = old_errno;

1115

977

}

1116

978

1117

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

1118

int ret;

1119

1120

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

1121

if(s < 0){

1122

perror_plus("socket");

1123

return false;

1124

}

1125

strcpy(ifr->ifr_name, ifname);

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

if(ret == -1){

1128

if(debug){

1129

perror_plus("ioctl SIOCGIFFLAGS");

1130

}

1131

return false;

1132

}

1133

return true;

1134

}

1135

1136

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

1137

1138

/* Reject the loopback device */

1139

if(ifr->ifr_flags & IFF_LOOPBACK){

1140

if(debug){

1141

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

1142

ifname);

1143

}

1144

return false;

1145

}

1146

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

1147

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

1148

if(debug){

1149

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

1150

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

1151

}

1152

return true;

1153

}

1154

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

1155

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

1156

if(debug){

1157

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1158

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

1159

}

1160

return false;

1161

}

1162

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

1163

if(ifr->ifr_flags & IFF_NOARP){

1164

if(debug){

1165

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

1166

ifname);

1167

}

1168

return false;

1169

}

1170

1171

/* Accept this device */

1172

if(debug){

1173

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

1174

}

1175

return true;

1176

}

1177

1178

/*

1179

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

1180

* corresponds to an acceptable network device.

1181

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

1182

*/

1183

int good_interface(const struct dirent *if_entry){

1184

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

1185

return 0;

1186

}

1187

1188

struct ifreq ifr;

1189

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

1190

if(debug){

1191

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

1192

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

1193

}

1194

return 0;

1195

}

1196

1197

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

1198

return 0;

1199

}

1200

return 1;

1201

}

1202

1203

/*

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1244

}

1245

1246

int notdotentries(const struct dirent *direntry){

1247

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

1248

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

1249

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

1250

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

1251

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

1252

return 0;

1253

}

1254

return 1;

1255

}

1256

1257

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

1258

int runnable_hook(const struct dirent *direntry){

1259

int ret;

1260

size_t sret;

1261

struct stat st;

1262

1263

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

1264

/* Empty name? */

1265

return 0;

1266

}

1267

1268

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

1269

"abcdefghijklmnopqrstuvwxyz"

1270

"0123456789"

1271

"_-");

1272

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

1273

/* Contains non-allowed characters */

1274

if(debug){

1275

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

1276

direntry->d_name);

1277

}

1278

return 0;

1279

}

1280

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1289

if(ret == -1){

1290

if(debug){

1291

perror_plus("Could not stat hook");

1292

}

1293

return 0;

1294

}

1295

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

1296

/* Not a regular file */

1297

if(debug){

1298

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

1299

direntry->d_name);

1300

}

1301

return 0;

1302

}

1303

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

1304

/* Not executable */

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 0;

1310

}

1311

if(debug){

1312

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

1313

direntry->d_name);

1314

}

1315

return 1;

1316

}

1317

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1319

int ret;

1320

struct timespec now;

1321

struct timespec waited_time;

1322

intmax_t block_time;

1323

1324

while(true){

1325

if(mc.current_server == NULL){

1326

if (debug){

1327

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

1328

" No timeout!\n");

1329

}

1330

ret = avahi_simple_poll_iterate(s, -1);

1331

} else {

1332

if (debug){

1333

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

1334

" it, or wait\n");

1335

}

1336

/* the current time */

1337

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1338

if(ret == -1){

1339

perror_plus("clock_gettime");

1340

return -1;

1341

}

1342

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

1343

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

1344

waited_time.tv_sec = (now.tv_sec

1345

- mc.current_server->last_seen.tv_sec);

1346

waited_time.tv_nsec = (now.tv_nsec

1347

- mc.current_server->last_seen.tv_nsec);

1348

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

1349

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

1350

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

1351

block_time = ((retry_interval

1352

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

1353

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

1354

1355

if (debug){

1356

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

1357

block_time);

1358

}

1359

1360

if(block_time <= 0){

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

1365

if(ret == 0){

1366

avahi_simple_poll_quit(mc.simple_poll);

1367

return 0;

1368

}

1369

ret = clock_gettime(CLOCK_MONOTONIC,

1370

&mc.current_server->last_seen);

1371

if(ret == -1){

1372

perror_plus("clock_gettime");

1373

return -1;

1374

}

1375

mc.current_server = mc.current_server->next;

1376

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

1377

servers, but don't block */

1378

}

1379

1380

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

1381

}

1382

if(ret != 0){

1383

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

1384

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

1385

}

1386

}

1387

}

1388

}

1389

1390

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

1391

const float delay){

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1397

if(numhooks == -1){

1398

perror_plus("scandir");

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

1406

perror_plus("asprintf");

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

1475

free(delaystring);

1476

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1477

perror_plus("execl");

1478

_exit(EXIT_FAILURE);

1479

}

1480

} else {

1481

int status;

1482

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

1483

perror_plus("waitpid");

1484

free(fullname);

1485

continue;

1486

}

1487

if(WIFEXITED(status)){

1488

if(WEXITSTATUS(status) != 0){

1489

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

1490

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

1491

WEXITSTATUS(status));

1492

free(fullname);

1493

continue;

1494

}

1495

} else if(WIFSIGNALED(status)){

1496

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

1497

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

1498

WTERMSIG(status));

1499

free(fullname);

1500

continue;

1501

} else {

1502

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

1503

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

1504

free(fullname);

1505

continue;

1506

}

1507

}

1508

free(fullname);

1509

if(debug){

1510

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

1511

direntry->d_name);

1512

}

1513

}

1514

close(devnull);

1515

}

1516

return true;

1517

}

1518

1519

979

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

1520

980

AvahiSServiceBrowser *sb = NULL;

1521

981

int error;

1523

983

intmax_t tmpmax;

1524

984

char *tmp;

1525

985

int exitcode = EXIT_SUCCESS;

1526

const char *interface = "";

986

const char *interface = "eth0";

1527

987

struct ifreq network;

1528

988

int sd = -1;

1529

989

bool take_down_interface = false;

1530

990

uid_t uid;

1531

991

gid_t gid;

992

char *connect_to = NULL;

1532

993

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

1533

994

bool tempdir_created = false;

1534

995

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1538

999

bool gnutls_initialized = false;

1539

1000

bool gpgme_initialized = false;

1540

1001

float delay = 2.5f;

1541

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

1542

retrying the same server again */

1543

1002

1544

1003

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1545

1004

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1551

1010

errno = 0;

1552

1011

ret = setgid(gid);

1553

1012

if(ret == -1){

1554

perror_plus("setgid");

1013

perror("setgid");

1555

1014

}

1556

1015

1557

1016

/* Lower user privileges (temporarily) */

1558

1017

errno = 0;

1559

1018

ret = seteuid(uid);

1560

1019

if(ret == -1){

1561

perror_plus("seteuid");

1020

perror("seteuid");

1562

1021

}

1563

1022

1564

1023

if(quit_now){

1599

1058

.arg = "SECONDS",

1600

1059

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

1601

1060

.group = 2 },

1602

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

1603

.arg = "SECONDS",

1604

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

1605

.group = 2 },

1606

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

1607

.arg = "DIR",

1608

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

1609

.group = 2 },

1610

/*

1611

* These reproduce what we would get without ARGP_NO_HELP

1612

*/

1613

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

1614

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

1615

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

1616

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

1617

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

1618

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

1619

1061

{ .name = NULL }

1620

1062

};

1621

1063

1622

1064

error_t parse_opt(int key, char *arg,

1623

1065

struct argp_state *state){

1624

errno = 0;

1625

1066

switch(key){

1626

1067

case 128: /* --debug */

1627

1068

debug = true;

1643

1084

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

1644

1085

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

1645

1086

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

1646

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

1087

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

1088

exit(EXIT_FAILURE);

1647

1089

}

1648

1090

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

1649

1091

break;

1654

1096

errno = 0;

1655

1097

delay = strtof(arg, &tmp);

1656

1098

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

1657

argp_error(state, "Bad delay");

1658

}

1659

case 132: /* --retry */

1660

errno = 0;

1661

retry_interval = strtod(arg, &tmp);

1662

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

1663

or (retry_interval * 1000) > INT_MAX

1664

or retry_interval < 0){

1665

argp_error(state, "Bad retry interval");

1666

}

1667

break;

1668

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

1669

hookdir = arg;

1670

break;

1671

/*

1672

* These reproduce what we would get without ARGP_NO_HELP

1673

*/

1674

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

1675

argp_state_help(state, state->out_stream,

1676

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1677

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1678

case -3: /* --usage */

1679

argp_state_help(state, state->out_stream,

1680

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1681

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

1682

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

1683

exit(argp_err_exit_status);

1099

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

1100

exit(EXIT_FAILURE);

1101

}

1102

break;

1103

case ARGP_KEY_ARG:

1104

argp_usage(state);

1105

case ARGP_KEY_END:

1684

1106

break;

1685

1107

default:

1686

1108

return ARGP_ERR_UNKNOWN;

1687

1109

}

1688

return errno;

1110

return 0;

1689

1111

}

1690

1112

1691

1113

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

1692

1114

.args_doc = "",

1693

1115

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

1694

1116

" passwords from a Mandos server" };

1695

ret = argp_parse(&argp, argc, argv,

1696

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1697

switch(ret){

1698

case 0:

1699

break;

1700

case ENOMEM:

1701

default:

1702

errno = ret;

1703

perror_plus("argp_parse");

1704

exitcode = EX_OSERR;

1705

goto end;

1706

case EINVAL:

1707

exitcode = EX_USAGE;

1708

goto end;

1709

}

1710

}

1711

1712

{

1713

/* Work around Debian bug #633582:

1714

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

1715

1716

/* Re-raise priviliges */

1717

errno = 0;

1718

ret = seteuid(0);

1719

if(ret == -1){

1720

perror_plus("seteuid");

1721

} else {

1722

struct stat st;

1723

1724

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

1725

int seckey_fd = open(seckey, O_RDONLY);

1726

if(seckey_fd == -1){

1727

perror_plus("open");

1728

} else {

1729

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

1730

if(ret == -1){

1731

perror_plus("fstat");

1732

} else {

1733

if(S_ISREG(st.st_mode)

1734

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

1735

ret = fchown(seckey_fd, uid, gid);

1736

if(ret == -1){

1737

perror_plus("fchown");

1738

}

1739

}

1740

}

1741

TEMP_FAILURE_RETRY(close(seckey_fd));

1742

}

1743

}

1744

1745

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

1746

int pubkey_fd = open(pubkey, O_RDONLY);

1747

if(pubkey_fd == -1){

1748

perror_plus("open");

1749

} else {

1750

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

1751

if(ret == -1){

1752

perror_plus("fstat");

1753

} else {

1754

if(S_ISREG(st.st_mode)

1755

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

1756

ret = fchown(pubkey_fd, uid, gid);

1757

if(ret == -1){

1758

perror_plus("fchown");

1759

}

1760

}

1761

}

1762

TEMP_FAILURE_RETRY(close(pubkey_fd));

1763

}

1764

}

1765

1766

/* Lower privileges */

1767

errno = 0;

1768

ret = seteuid(uid);

1769

if(ret == -1){

1770

perror_plus("seteuid");

1771

}

1772

}

1773

}

1774

1775

/* Run network hooks */

1776

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

1777

goto end;

1117

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

1118

if(ret == ARGP_ERR_UNKNOWN){

1119

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

1120

exitcode = EXIT_FAILURE;

1121

goto end;

1122

}

1778

1123

}

1779

1124

1780

1125

if(not debug){

1781

1126

avahi_set_log_function(empty_log);

1782

1127

}

1783

1128

1784

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

1785

struct dirent **direntries;

1786

/* First look for interfaces that are up */

1787

ret = scandir(sys_class_net, &direntries, up_interface,

1788

alphasort);

1789

if(ret == 0){

1790

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

1791

free(direntries);

1792

ret = scandir(sys_class_net, &direntries, good_interface,

1793

alphasort);

1794

}

1795

if(ret >= 1){

1796

/* Pick the first interface returned */

1797

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

1798

if(debug){

1799

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

1800

}

1801

if(interface == NULL){

1802

perror_plus("malloc");

1803

free(direntries);

1804

exitcode = EXIT_FAILURE;

1805

goto end;

1806

}

1807

free(direntries);

1808

} else {

1809

free(direntries);

1810

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

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

}

1815

1816

1129

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

1817

1130

from the signal handler */

1818

1131

/* Initialize the pseudo-RNG for Avahi */

1819

1132

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

1820

1133

mc.simple_poll = avahi_simple_poll_new();

1821

1134

if(mc.simple_poll == NULL){

1822

fprintf_plus(stderr,

1823

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

1824

exitcode = EX_UNAVAILABLE;

1135

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

1136

exitcode = EXIT_FAILURE;

1825

1137

goto end;

1826

1138

}

1827

1139

1828

1140

sigemptyset(&sigterm_action.sa_mask);

1829

1141

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

1830

1142

if(ret == -1){

1831

perror_plus("sigaddset");

1832

exitcode = EX_OSERR;

1143

perror("sigaddset");

1144

exitcode = EXIT_FAILURE;

1833

1145

goto end;

1834

1146

}

1835

1147

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

1836

1148

if(ret == -1){

1837

perror_plus("sigaddset");

1838

exitcode = EX_OSERR;

1149

perror("sigaddset");

1150

exitcode = EXIT_FAILURE;

1839

1151

goto end;

1840

1152

}

1841

1153

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

1842

1154

if(ret == -1){

1843

perror_plus("sigaddset");

1844

exitcode = EX_OSERR;

1155

perror("sigaddset");

1156

exitcode = EXIT_FAILURE;

1845

1157

goto end;

1846

1158

}

1847

1159

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

1850

1162

*/

1851

1163

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

1852

1164

if(ret == -1){

1853

perror_plus("sigaction");

1854

return EX_OSERR;

1165

perror("sigaction");

1166

return EXIT_FAILURE;

1855

1167

}

1856

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1857

1169

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

1858

1170

if(ret == -1){

1859

perror_plus("sigaction");

1860

exitcode = EX_OSERR;

1171

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1861

1173

goto end;

1862

1174

}

1863

1175

}

1864

1176

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

1865

1177

if(ret == -1){

1866

perror_plus("sigaction");

1867

return EX_OSERR;

1178

perror("sigaction");

1179

return EXIT_FAILURE;

1868

1180

}

1869

1181

if(old_sigterm_action.sa_handler != SIG_IGN){

1870

1182

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

1871

1183

if(ret == -1){

1872

perror_plus("sigaction");

1873

exitcode = EX_OSERR;

1184

perror("sigaction");

1185

exitcode = EXIT_FAILURE;

1874

1186

goto end;

1875

1187

}

1876

1188

}

1877

1189

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

1878

1190

if(ret == -1){

1879

perror_plus("sigaction");

1880

return EX_OSERR;

1191

perror("sigaction");

1192

return EXIT_FAILURE;

1881

1193

}

1882

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1883

1195

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

1884

1196

if(ret == -1){

1885

perror_plus("sigaction");

1886

exitcode = EX_OSERR;

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1887

1199

goto end;

1888

1200

}

1889

1201

}

1890

1202

1891

1203

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

1892

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

1204

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

1893

1205

if_index = (AvahiIfIndex) if_nametoindex(interface);

1894

1206

if(if_index == 0){

1895

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

1896

exitcode = EX_UNAVAILABLE;

1207

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

1208

exitcode = EXIT_FAILURE;

1897

1209

goto end;

1898

1210

}

1899

1211

1905

1217

errno = 0;

1906

1218

ret = seteuid(0);

1907

1219

if(ret == -1){

1908

perror_plus("seteuid");

1220

perror("seteuid");

1909

1221

}

1910

1222

1911

1223

#ifdef __linux__

1912

1224

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1913

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

1225

messages to mess up the prompt */

1914

1226

ret = klogctl(8, NULL, 5);

1915

1227

bool restore_loglevel = true;

1916

1228

if(ret == -1){

1917

1229

restore_loglevel = false;

1918

perror_plus("klogctl");

1230

perror("klogctl");

1919

1231

}

1920

1232

#endif /* __linux__ */

1921

1233

1922

1234

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1923

1235

if(sd < 0){

1924

perror_plus("socket");

1925

exitcode = EX_OSERR;

1236

perror("socket");

1237

exitcode = EXIT_FAILURE;

1926

1238

#ifdef __linux__

1927

1239

if(restore_loglevel){

1928

1240

ret = klogctl(7, NULL, 0);

1929

1241

if(ret == -1){

1930

perror_plus("klogctl");

1242

perror("klogctl");

1931

1243

}

1932

1244

}

1933

1245

#endif /* __linux__ */

1935

1247

errno = 0;

1936

1248

ret = seteuid(uid);

1937

1249

if(ret == -1){

1938

perror_plus("seteuid");

1250

perror("seteuid");

1939

1251

}

1940

1252

goto end;

1941

1253

}

1942

1254

strcpy(network.ifr_name, interface);

1943

1255

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

1944

1256

if(ret == -1){

1945

perror_plus("ioctl SIOCGIFFLAGS");

1257

perror("ioctl SIOCGIFFLAGS");

1946

1258

#ifdef __linux__

1947

1259

if(restore_loglevel){

1948

1260

ret = klogctl(7, NULL, 0);

1949

1261

if(ret == -1){

1950

perror_plus("klogctl");

1262

perror("klogctl");

1951

1263

}

1952

1264

}

1953

1265

#endif /* __linux__ */

1954

exitcode = EX_OSERR;

1266

exitcode = EXIT_FAILURE;

1955

1267

/* Lower privileges */

1956

1268

errno = 0;

1957

1269

ret = seteuid(uid);

1958

1270

if(ret == -1){

1959

perror_plus("seteuid");

1271

perror("seteuid");

1960

1272

}

1961

1273

goto end;

1962

1274

}

1966

1278

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

1967

1279

if(ret == -1){

1968

1280

take_down_interface = false;

1969

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1970

exitcode = EX_OSERR;

1281

perror("ioctl SIOCSIFFLAGS");

1282

exitcode = EXIT_FAILURE;

1971

1283

#ifdef __linux__

1972

1284

if(restore_loglevel){

1973

1285

ret = klogctl(7, NULL, 0);

1974

1286

if(ret == -1){

1975

perror_plus("klogctl");

1287

perror("klogctl");

1976

1288

}

1977

1289

}

1978

1290

#endif /* __linux__ */

1980

1292

errno = 0;

1981

1293

ret = seteuid(uid);

1982

1294

if(ret == -1){

1983

perror_plus("seteuid");

1295

perror("seteuid");

1984

1296

}

1985

1297

goto end;

1986

1298

}

1987

1299

}

1988

/* Sleep checking until interface is running.

1989

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

1300

/* sleep checking until interface is running */

1990

1301

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

1991

1302

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

1992

1303

if(ret == -1){

1993

perror_plus("ioctl SIOCGIFFLAGS");

1304

perror("ioctl SIOCGIFFLAGS");

1994

1305

} else if(network.ifr_flags & IFF_RUNNING){

1995

1306

break;

1996

1307

}

1997

1308

struct timespec sleeptime = { .tv_nsec = 250000000 };

1998

1309

ret = nanosleep(&sleeptime, NULL);

1999

1310

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

2000

perror_plus("nanosleep");

1311

perror("nanosleep");

2001

1312

}

2002

1313

}

2003

1314

if(not take_down_interface){

2004

1315

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

2005

1316

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

2006

1317

if(ret == -1){

2007

perror_plus("close");

1318

perror("close");

2008

1319

}

2009

1320

}

2010

1321

#ifdef __linux__

2012

1323

/* Restores kernel loglevel to default */

2013

1324

ret = klogctl(7, NULL, 0);

2014

1325

if(ret == -1){

2015

perror_plus("klogctl");

1326

perror("klogctl");

2016

1327

}

2017

1328

}

2018

1329

#endif /* __linux__ */

2019

1330

/* Lower privileges */

2020

1331

errno = 0;

2021

/* Lower privileges */

2022

ret = seteuid(uid);

2023

if(ret == -1){

2024

perror_plus("seteuid");

1332

if(take_down_interface){

1333

/* Lower privileges */

1334

ret = seteuid(uid);

1335

if(ret == -1){

1336

perror("seteuid");

1337

}

1338

} else {

1339

/* Lower privileges permanently */

1340

ret = setuid(uid);

1341

if(ret == -1){

1342

perror("setuid");

1343

}

2025

1344

}

2026

1345

}

2027

1346

2031

1350

2032

1351

ret = init_gnutls_global(pubkey, seckey);

2033

1352

if(ret == -1){

2034

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

2035

exitcode = EX_UNAVAILABLE;

1353

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

1354

exitcode = EXIT_FAILURE;

2036

1355

goto end;

2037

1356

} else {

2038

1357

gnutls_initialized = true;

2042

1361

goto end;

2043

1362

}

2044

1363

1364

tempdir_created = true;

2045

1365

if(mkdtemp(tempdir) == NULL){

2046

perror_plus("mkdtemp");

1366

tempdir_created = false;

1367

perror("mkdtemp");

2047

1368

goto end;

2048

1369

}

2049

tempdir_created = true;

2050

1370

2051

1371

if(quit_now){

2052

1372

goto end;

2053

1373

}

2054

1374

2055

1375

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

2056

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

2057

exitcode = EX_UNAVAILABLE;

1376

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

1377

exitcode = EXIT_FAILURE;

2058

1378

goto end;

2059

1379

} else {

2060

1380

gpgme_initialized = true;

2069

1389

/* (Mainly meant for debugging) */

2070

1390

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

2071

1391

if(address == NULL){

2072

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

2073

exitcode = EX_USAGE;

1392

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

1393

exitcode = EXIT_FAILURE;

2074

1394

goto end;

2075

1395

}

2076

1396

2083

1403

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

2084

1404

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

2085

1405

or tmpmax != (uint16_t)tmpmax){

2086

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

2087

exitcode = EX_USAGE;

1406

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

1407

exitcode = EXIT_FAILURE;

2088

1408

goto end;

2089

1409

}

2090

1410

2094

1414

2095

1415

port = (uint16_t)tmpmax;

2096

1416

*address = '\0';

1417

address = connect_to;

2097

1418

/* Colon in address indicates IPv6 */

2098

1419

int af;

2099

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

1420

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

2100

1421

af = AF_INET6;

2101

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

2102

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

2103

{

2104

connect_to++;

2105

address[-1] = '\0';

2106

}

2107

1422

} else {

2108

1423

af = AF_INET;

2109

1424

}

2110

address = connect_to;

2111

1425

2112

1426

if(quit_now){

2113

1427

goto end;

2114

1428

}

2115

1429

2116

while(not quit_now){

2117

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

2118

if(quit_now or ret == 0){

2119

break;

2120

}

2121

if(debug){

2122

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

2123

(int)retry_interval);

2124

}

2125

sleep((int)retry_interval);

2126

}

2127

2128

if (not quit_now){

1430

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

1431

if(ret < 0){

1432

exitcode = EXIT_FAILURE;

1433

} else {

2129

1434

exitcode = EXIT_SUCCESS;

2130

1435

}

2131

2132

1436

goto end;

2133

1437

}

2134

1438

2156

1460

2157

1461

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

2158

1462

if(mc.server == NULL){

2159

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

2160

avahi_strerror(error));

2161

exitcode = EX_UNAVAILABLE;

1463

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

1464

avahi_strerror(error));

1465

exitcode = EXIT_FAILURE;

2162

1466

goto end;

2163

1467

}

2164

1468

2171

1475

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2172

1476

NULL, 0, browse_callback, NULL);

2173

1477

if(sb == NULL){

2174

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

2175

avahi_strerror(avahi_server_errno(mc.server)));

2176

exitcode = EX_UNAVAILABLE;

1478

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

1479

avahi_strerror(avahi_server_errno(mc.server)));

1480

exitcode = EXIT_FAILURE;

2177

1481

goto end;

2178

1482

}

2179

1483

2184

1488

/* Run the main loop */

2185

1489

2186

1490

if(debug){

2187

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

2188

}

2189

2190

ret = avahi_loop_with_timeout(mc.simple_poll,

2191

(int)(retry_interval * 1000));

2192

if(debug){

2193

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

2194

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

2195

}

1491

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

1492

}

1493

1494

avahi_simple_poll_loop(mc.simple_poll);

2196

1495

2197

1496

end:

2198

1497

2199

1498

if(debug){

2200

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

1499

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

2201

1500

}

2202

1501

2203

1502

/* Cleanup things */

2220

1519

gpgme_release(mc.ctx);

2221

1520

}

2222

1521

2223

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

2224

has seen */

2225

if(mc.current_server != NULL){

2226

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

2227

while(mc.current_server != NULL){

2228

server *next = mc.current_server->next;

2229

free(mc.current_server);

2230

mc.current_server = next;

2231

}

2232

}

2233

2234

/* Run network hooks */

2235

run_network_hooks("stop", interface, delay);

2236

2237

/* Re-raise priviliges */

2238

{

1522

/* Take down the network interface */

1523

if(take_down_interface){

1524

/* Re-raise priviliges */

2239

1525

errno = 0;

2240

1526

ret = seteuid(0);

2241

1527

if(ret == -1){

2242

perror_plus("seteuid");

1528

perror("seteuid");

2243

1529

}

2244

2245

/* Take down the network interface */

2246

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

1530

if(geteuid() == 0){

2247

1531

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

2248

1532

if(ret == -1){

2249

perror_plus("ioctl SIOCGIFFLAGS");

2250

} else if(network.ifr_flags & IFF_UP){

2251

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

1533

perror("ioctl SIOCGIFFLAGS");

1534

} else if(network.ifr_flags & IFF_UP) {

1535

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

2252

1536

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

2253

1537

if(ret == -1){

2254

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1538

perror("ioctl SIOCSIFFLAGS");

2255

1539

}

2256

1540

}

2257

1541

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

2258

1542

if(ret == -1){

2259

perror_plus("close");

1543

perror("close");

1544

}

1545

/* Lower privileges permanently */

1546

errno = 0;

1547

ret = setuid(uid);

1548

if(ret == -1){

1549

perror("setuid");

2260

1550

}

2261

1551

}

2262

1552

}

2263

/* Lower privileges permanently */

2264

errno = 0;

2265

ret = setuid(uid);

2266

if(ret == -1){

2267

perror_plus("setuid");

2268

}

2269

1553

2270

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

1554

/* Removes the temp directory used by GPGME */

2271

1555

if(tempdir_created){

2272

struct dirent **direntries = NULL;

2273

struct dirent *direntry = NULL;

2274

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

2275

alphasort);

2276

if (numentries > 0){

2277

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

2278

direntry = direntries[i];

1556

DIR *d;

1557

struct dirent *direntry;

1558

d = opendir(tempdir);

1559

if(d == NULL){

1560

if(errno != ENOENT){

1561

perror("opendir");

1562

}

1563

} else {

1564

while(true){

1565

direntry = readdir(d);

1566

if(direntry == NULL){

1567

break;

1568

}

1569

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

1570

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

1571

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

1572

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

1573

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

1574

continue;

1575

}

2279

1576

char *fullname = NULL;

2280

1577

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

2281

1578

direntry->d_name);

2282

1579

if(ret < 0){

2283

perror_plus("asprintf");

1580

perror("asprintf");

2284

1581

continue;

2285

1582

}

2286

1583

ret = remove(fullname);

2287

1584

if(ret == -1){

2288

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

2289

strerror(errno));

1585

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

1586

strerror(errno));

2290

1587

}

2291

1588

free(fullname);

2292

1589

}

2293

}

2294

2295

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

2296

free(direntries);

2297

if (numentries == -1){

2298

perror_plus("scandir");

1590

closedir(d);

2299

1591

}

2300

1592

ret = rmdir(tempdir);

2301

1593

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

2302

perror_plus("rmdir");

1594

perror("rmdir");

2303

1595

}

2304

1596

}

2305

1597

2306

1598

if(quit_now){

2307

1599

sigemptyset(&old_sigterm_action.sa_mask);

2308

1600

old_sigterm_action.sa_handler = SIG_DFL;

2309

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2310

&old_sigterm_action,

2311

NULL));

1601

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

2312

1602

if(ret == -1){

2313

perror_plus("sigaction");

2314

}

2315

do {

2316

ret = raise(signal_received);

2317

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

2318

if(ret != 0){

2319

perror_plus("raise");

2320

abort();

2321

}

2322

TEMP_FAILURE_RETRY(pause());

1603

perror("sigaction");

1604

}

1605

raise(signal_received);

2323

1606

}

2324

1607

2325

1608

return exitcode;