/mandos/trunk : revision 556

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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@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() */

43

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(), abort() */

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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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*/

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

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

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setgid(), pause() */

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

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

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

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78

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

78

79

#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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85

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() */

85

91

86

92

#ifdef __linux__

87

93

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

105

111

init_gnutls_session(),

106

112

GNUTLS_* */

107

113

#include <gnutls/openpgp.h>

108

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

114

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

110

116

111

117

/* GPGME */

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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"

123

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";

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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;

144

int af;

145

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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149

129

150

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

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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;

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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"

143

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

165

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

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.current_server = NULL };

144

167

145

168

sig_atomic_t quit_now = 0;

146

169

int signal_received = 0;

147

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: ",

175

program_invocation_short_name);

176

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

}

189

148

190

/*

149

191

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

150

192

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

151

193

* "buffer_length" is how much is already used.

152

194

*/

153

195

size_t incbuffer(char **buffer, size_t buffer_length,

154

size_t buffer_capacity){

196

size_t buffer_capacity){

155

197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

156

198

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

157

199

if(buffer == NULL){

162

204

return buffer_capacity;

163

205

}

164

206

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,

218

.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

165

244

/*

166

245

* Initialize GPGME.

167

246

*/

168

static bool init_gpgme(const char *seckey,

169

const char *pubkey, const char *tempdir){

247

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

248

const char *tempdir){

170

249

gpgme_error_t rc;

171

250

gpgme_engine_info_t engine_info;

172

251

181

260

182

261

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

183

262

if(fd == -1){

184

perror("open");

263

perror_plus("open");

185

264

return false;

186

265

}

187

266

188

267

rc = gpgme_data_new_from_fd(&pgp_data, fd);

189

268

if(rc != GPG_ERR_NO_ERROR){

190

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

191

gpgme_strsource(rc), gpgme_strerror(rc));

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

192

271

return false;

193

272

}

194

273

195

274

rc = gpgme_op_import(mc.ctx, pgp_data);

196

275

if(rc != GPG_ERR_NO_ERROR){

197

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

198

gpgme_strsource(rc), gpgme_strerror(rc));

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

199

278

return false;

200

279

}

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

203

282

if(ret == -1){

204

perror("close");

283

perror_plus("close");

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284

}

206

285

gpgme_data_release(pgp_data);

207

286

return true;

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287

}

209

288

210

289

if(debug){

211

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

290

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

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291

}

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293

/* Init GPGME */

215

294

gpgme_check_version(NULL);

216

295

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

217

296

if(rc != GPG_ERR_NO_ERROR){

218

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

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gpgme_strsource(rc), gpgme_strerror(rc));

297

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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299

return false;

221

300

}

222

301

223

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

302

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

224

303

rc = gpgme_get_engine_info(&engine_info);

225

304

if(rc != GPG_ERR_NO_ERROR){

226

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

227

gpgme_strsource(rc), gpgme_strerror(rc));

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

228

307

return false;

229

308

}

230

309

while(engine_info != NULL){

236

315

engine_info = engine_info->next;

237

316

}

238

317

if(engine_info == NULL){

239

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

318

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

319

tempdir);

240

320

return false;

241

321

}

242

322

243

323

/* Create new GPGME "context" */

244

324

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

245

325

if(rc != GPG_ERR_NO_ERROR){

246

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

247

gpgme_strsource(rc), gpgme_strerror(rc));

326

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

327

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

328

gpgme_strerror(rc));

248

329

return false;

249

330

}

250

331

269

350

ssize_t plaintext_length = 0;

270

351

271

352

if(debug){

272

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

353

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

273

354

}

274

355

275

356

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

276

357

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

277

358

0);

278

359

if(rc != GPG_ERR_NO_ERROR){

279

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

280

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

281

362

return -1;

282

363

}

283

364

284

365

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

285

366

rc = gpgme_data_new(&dh_plain);

286

367

if(rc != GPG_ERR_NO_ERROR){

287

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

288

gpgme_strsource(rc), gpgme_strerror(rc));

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

289

371

gpgme_data_release(dh_crypto);

290

372

return -1;

291

373

}

294

376

data buffer */

295

377

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

296

378

if(rc != GPG_ERR_NO_ERROR){

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

299

381

plaintext_length = -1;

300

382

if(debug){

301

383

gpgme_decrypt_result_t result;

302

384

result = gpgme_op_decrypt_result(mc.ctx);

303

385

if(result == NULL){

304

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

386

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

305

387

} else {

306

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

307

result->unsupported_algorithm);

308

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

309

result->wrong_key_usage);

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);

310

392

if(result->file_name != NULL){

311

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

393

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

312

394

}

313

395

gpgme_recipient_t recipient;

314

396

recipient = result->recipients;

315

397

while(recipient != NULL){

316

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

317

gpgme_pubkey_algo_name(recipient->pubkey_algo));

318

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

319

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

320

recipient->status == GPG_ERR_NO_SECKEY

321

? "No" : "Yes");

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");

322

405

recipient = recipient->next;

323

406

}

324

407

}

327

410

}

328

411

329

412

if(debug){

330

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

413

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

331

414

}

332

415

333

416

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

334

417

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

335

perror("gpgme_data_seek");

418

perror_plus("gpgme_data_seek");

336

419

plaintext_length = -1;

337

420

goto decrypt_end;

338

421

}

340

423

*plaintext = NULL;

341

424

while(true){

342

425

plaintext_capacity = incbuffer(plaintext,

343

(size_t)plaintext_length,

344

plaintext_capacity);

426

(size_t)plaintext_length,

427

plaintext_capacity);

345

428

if(plaintext_capacity == 0){

346

perror("incbuffer");

347

plaintext_length = -1;

348

goto decrypt_end;

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

349

432

}

350

433

351

434

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

356

439

break;

357

440

}

358

441

if(ret < 0){

359

perror("gpgme_data_read");

442

perror_plus("gpgme_data_read");

360

443

plaintext_length = -1;

361

444

goto decrypt_end;

362

445

}

364

447

}

365

448

366

449

if(debug){

367

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

450

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

368

451

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

369

452

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

370

453

}

392

475

/* GnuTLS log function callback */

393

476

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

394

477

const char* string){

395

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

478

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

396

479

}

397

480

398

481

static int init_gnutls_global(const char *pubkeyfilename,

400

483

int ret;

401

484

402

485

if(debug){

403

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

486

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

404

487

}

405

488

406

489

ret = gnutls_global_init();

407

490

if(ret != GNUTLS_E_SUCCESS){

408

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

409

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

410

493

return -1;

411

494

}

412

495

419

502

}

420

503

421

504

/* OpenPGP credentials */

422

gnutls_certificate_allocate_credentials(&mc.cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

423

506

if(ret != GNUTLS_E_SUCCESS){

424

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

425

from

426

-Wunreachable-code

427

*/

428

safer_gnutls_strerror(ret));

507

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

508

safer_gnutls_strerror(ret));

429

509

gnutls_global_deinit();

430

510

return -1;

431

511

}

432

512

433

513

if(debug){

434

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

435

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

436

seckeyfilename);

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

437

518

}

438

519

439

520

ret = gnutls_certificate_set_openpgp_key_file

440

521

(mc.cred, pubkeyfilename, seckeyfilename,

441

522

GNUTLS_OPENPGP_FMT_BASE64);

442

523

if(ret != GNUTLS_E_SUCCESS){

443

fprintf(stderr,

444

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

445

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

446

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

447

safer_gnutls_strerror(ret));

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));

448

529

goto globalfail;

449

530

}

450

531

451

532

/* GnuTLS server initialization */

452

533

ret = gnutls_dh_params_init(&mc.dh_params);

453

534

if(ret != GNUTLS_E_SUCCESS){

454

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

455

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

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

456

538

goto globalfail;

457

539

}

458

540

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

459

541

if(ret != GNUTLS_E_SUCCESS){

460

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

461

safer_gnutls_strerror(ret));

542

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

543

safer_gnutls_strerror(ret));

462

544

goto globalfail;

463

545

}

464

546

484

566

}

485

567

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

486

568

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

489

572

}

490

573

491

574

{

498

581

}

499

582

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

500

583

if(ret != GNUTLS_E_SUCCESS){

501

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

502

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

503

safer_gnutls_strerror(ret));

584

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

585

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

586

safer_gnutls_strerror(ret));

504

587

gnutls_deinit(*session);

505

588

return -1;

506

589

}

515

598

}

516

599

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

517

600

if(ret != GNUTLS_E_SUCCESS){

518

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

519

safer_gnutls_strerror(ret));

601

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

602

safer_gnutls_strerror(ret));

520

603

gnutls_deinit(*session);

521

604

return -1;

522

605

}

552

635

gnutls_session_t session;

553

636

int pf; /* Protocol family */

554

637

638

errno = 0;

639

555

640

if(quit_now){

641

errno = EINTR;

556

642

return -1;

557

643

}

558

644

564

650

pf = PF_INET;

565

651

break;

566

652

default:

567

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

653

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

654

errno = EINVAL;

568

655

return -1;

569

656

}

570

657

574

661

}

575

662

576

663

if(debug){

577

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

578

"\n", ip, port);

664

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

665

PRIu16 "\n", ip, port);

579

666

}

580

667

581

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

582

669

if(tcp_sd < 0){

583

perror("socket");

670

int e = errno;

671

perror_plus("socket");

672

errno = e;

584

673

goto mandos_end;

585

674

}

586

675

587

676

if(quit_now){

677

errno = EINTR;

588

678

goto mandos_end;

589

679

}

590

680

597

687

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

598

688

}

599

689

if(ret < 0 ){

600

perror("inet_pton");

690

int e = errno;

691

perror_plus("inet_pton");

692

errno = e;

601

693

goto mandos_end;

602

694

}

603

695

if(ret == 0){

604

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

696

int e = errno;

697

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

698

errno = e;

605

699

goto mandos_end;

606

700

}

607

701

if(af == AF_INET6){

611

705

612

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

613

707

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

614

-Wunreachable-code*/

708

-Wunreachable-code*/

615

709

if(if_index == AVAHI_IF_UNSPEC){

616

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

617

" without a network interface\n");

710

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

711

" incomplete without a network interface\n");

712

errno = EINVAL;

618

713

goto mandos_end;

619

714

}

620

715

/* Set the network interface number as scope */

627

722

}

628

723

629

724

if(quit_now){

725

errno = EINTR;

630

726

goto mandos_end;

631

727

}

632

728

634

730

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

635

731

char interface[IF_NAMESIZE];

636

732

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

637

perror("if_indextoname");

733

perror_plus("if_indextoname");

638

734

} else {

639

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

640

ip, interface, port);

735

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

736

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

641

737

}

642

738

} else {

643

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

644

port);

739

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

740

ip, port);

645

741

}

646

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

647

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

654

750

sizeof(addrstr));

655

751

}

656

752

if(pcret == NULL){

657

perror("inet_ntop");

753

perror_plus("inet_ntop");

658

754

} else {

659

755

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

660

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

756

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

661

757

}

662

758

}

663

759

}

664

760

665

761

if(quit_now){

762

errno = EINTR;

666

763

goto mandos_end;

667

764

}

668

765

672

769

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

673

770

}

674

771

if(ret < 0){

675

perror("connect");

772

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

773

int e = errno;

774

perror_plus("connect");

775

errno = e;

776

}

676

777

goto mandos_end;

677

778

}

678

779

679

780

if(quit_now){

781

errno = EINTR;

680

782

goto mandos_end;

681

783

}

682

784

685

787

while(true){

686

788

size_t out_size = strlen(out);

687

789

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

688

out_size - written));

790

out_size - written));

689

791

if(ret == -1){

690

perror("write");

792

int e = errno;

793

perror_plus("write");

794

errno = e;

691

795

goto mandos_end;

692

796

}

693

797

written += (size_t)ret;

703

807

}

704

808

705

809

if(quit_now){

810

errno = EINTR;

706

811

goto mandos_end;

707

812

}

708

813

}

709

814

710

815

if(debug){

711

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

816

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

712

817

}

713

818

714

819

if(quit_now){

820

errno = EINTR;

715

821

goto mandos_end;

716

822

}

717

823

824

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

718

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

719

826

720

827

if(quit_now){

828

errno = EINTR;

721

829

goto mandos_end;

722

830

}

723

831

724

832

do {

725

833

ret = gnutls_handshake(session);

726

834

if(quit_now){

835

errno = EINTR;

727

836

goto mandos_end;

728

837

}

729

838

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

730

839

731

840

if(ret != GNUTLS_E_SUCCESS){

732

841

if(debug){

733

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

842

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

734

843

gnutls_perror(ret);

735

844

}

845

errno = EPROTO;

736

846

goto mandos_end;

737

847

}

738

848

739

849

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

740

850

741

851

if(debug){

742

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

743

ip);

852

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

853

" %s\n", ip);

744

854

}

745

855

746

856

while(true){

747

857

748

858

if(quit_now){

859

errno = EINTR;

749

860

goto mandos_end;

750

861

}

751

862

752

863

buffer_capacity = incbuffer(&buffer, buffer_length,

753

buffer_capacity);

864

buffer_capacity);

754

865

if(buffer_capacity == 0){

755

perror("incbuffer");

866

int e = errno;

867

perror_plus("incbuffer");

868

errno = e;

756

869

goto mandos_end;

757

870

}

758

871

759

872

if(quit_now){

873

errno = EINTR;

760

874

goto mandos_end;

761

875

}

762

876

775

889

ret = gnutls_handshake(session);

776

890

777

891

if(quit_now){

892

errno = EINTR;

778

893

goto mandos_end;

779

894

}

780

895

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

781

896

if(ret < 0){

782

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

897

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

898

"***\n");

783

899

gnutls_perror(ret);

900

errno = EPROTO;

784

901

goto mandos_end;

785

902

}

786

903

break;

787

904

default:

788

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

789

" encrypted session with Mandos server\n");

905

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

906

" encrypted session with Mandos server\n");

790

907

gnutls_bye(session, GNUTLS_SHUT_RDWR);

908

errno = EIO;

791

909

goto mandos_end;

792

910

}

793

911

} else {

796

914

}

797

915

798

916

if(debug){

799

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

917

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

800

918

}

801

919

802

920

if(quit_now){

921

errno = EINTR;

803

922

goto mandos_end;

804

923

}

805

924

806

925

do {

807

926

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

808

927

if(quit_now){

928

errno = EINTR;

809

929

goto mandos_end;

810

930

}

811

931

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

812

932

813

933

if(buffer_length > 0){

814

934

ssize_t decrypted_buffer_size;

815

decrypted_buffer_size = pgp_packet_decrypt(buffer,

816

buffer_length,

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

817

936

&decrypted_buffer);

818

937

if(decrypted_buffer_size >= 0){

819

938

820

939

written = 0;

821

940

while(written < (size_t) decrypted_buffer_size){

822

941

if(quit_now){

942

errno = EINTR;

823

943

goto mandos_end;

824

944

}

825

945

827

947

(size_t)decrypted_buffer_size - written,

828

948

stdout);

829

949

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

950

int e = errno;

830

951

if(debug){

831

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

832

strerror(errno));

952

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

953

strerror(errno));

833

954

}

955

errno = e;

834

956

goto mandos_end;

835

957

}

836

958

written += (size_t)ret;

842

964

/* Shutdown procedure */

843

965

844

966

mandos_end:

845

free(decrypted_buffer);

846

free(buffer);

847

if(tcp_sd >= 0){

848

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

849

}

850

if(ret == -1){

851

perror("close");

852

}

853

gnutls_deinit(session);

854

if(quit_now){

855

retval = -1;

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

}

856

986

}

857

987

return retval;

858

988

}

883

1013

switch(event){

884

1014

default:

885

1015

case AVAHI_RESOLVER_FAILURE:

886

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

887

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

888

avahi_strerror(avahi_server_errno(mc.server)));

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)));

889

1020

break;

890

1021

891

1022

case AVAHI_RESOLVER_FOUND:

893

1024

char ip[AVAHI_ADDRESS_STR_MAX];

894

1025

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

895

1026

if(debug){

896

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

897

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

898

ip, (intmax_t)interface, port);

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);

899

1030

}

900

1031

int ret = start_mandos_communication(ip, port, interface,

901

1032

avahi_proto_to_af(proto));

902

1033

if(ret == 0){

903

1034

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

}

904

1041

}

905

1042

}

906

1043

}

930

1067

default:

931

1068

case AVAHI_BROWSER_FAILURE:

932

1069

933

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

934

avahi_strerror(avahi_server_errno(mc.server)));

1070

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

935

1072

avahi_simple_poll_quit(mc.simple_poll);

936

1073

return;

937

1074

944

1081

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

945

1082

name, type, domain, protocol, 0,

946

1083

resolve_callback, NULL) == NULL)

947

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

948

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

1084

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

1085

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

949

1087

break;

950

1088

951

1089

case AVAHI_BROWSER_REMOVE:

954

1092

case AVAHI_BROWSER_ALL_FOR_NOW:

955

1093

case AVAHI_BROWSER_CACHE_EXHAUSTED:

956

1094

if(debug){

957

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

1095

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

1096

" searching...\n");

958

1097

}

959

1098

break;

960

1099

}

961

1100

}

962

1101

963

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

1102

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

964

1103

static void handle_sigterm(int sig){

965

1104

if(quit_now){

966

1105

return;

968

1107

quit_now = 1;

969

1108

signal_received = sig;

970

1109

int old_errno = errno;

1110

/* set main loop to exit */

971

1111

if(mc.simple_poll != NULL){

972

1112

avahi_simple_poll_quit(mc.simple_poll);

973

1113

}

974

1114

errno = old_errno;

975

1115

}

976

1116

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("VERBOSITY", 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(connect_to != NULL){

1477

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

1478

if(ret == -1){

1479

perror_plus("setenv");

1480

_exit(EX_OSERR);

1481

}

1482

}

1483

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

1484

perror_plus("execl");

1485

_exit(EXIT_FAILURE);

1486

}

1487

} else {

1488

int status;

1489

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

1490

perror_plus("waitpid");

1491

free(fullname);

1492

continue;

1493

}

1494

if(WIFEXITED(status)){

1495

if(WEXITSTATUS(status) != 0){

1496

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

1497

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

1498

WEXITSTATUS(status));

1499

free(fullname);

1500

continue;

1501

}

1502

} else if(WIFSIGNALED(status)){

1503

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

1504

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

1505

WTERMSIG(status));

1506

free(fullname);

1507

continue;

1508

} else {

1509

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

1510

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

1511

free(fullname);

1512

continue;

1513

}

1514

}

1515

free(fullname);

1516

if(debug){

1517

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

1518

direntry->d_name);

1519

}

1520

}

1521

close(devnull);

1522

}

1523

return true;

1524

}

1525

977

1526

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

978

1527

AvahiSServiceBrowser *sb = NULL;

979

1528

int error;

981

1530

intmax_t tmpmax;

982

1531

char *tmp;

983

1532

int exitcode = EXIT_SUCCESS;

984

const char *interface = "eth0";

1533

const char *interface = "";

985

1534

struct ifreq network;

986

1535

int sd = -1;

987

1536

bool take_down_interface = false;

988

1537

uid_t uid;

989

1538

gid_t gid;

990

char *connect_to = NULL;

991

1539

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

992

1540

bool tempdir_created = false;

993

1541

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

997

1545

bool gnutls_initialized = false;

998

1546

bool gpgme_initialized = false;

999

1547

float delay = 2.5f;

1548

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

1549

retrying the same server again */

1000

1550

1001

1551

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1002

1552

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1008

1558

errno = 0;

1009

1559

ret = setgid(gid);

1010

1560

if(ret == -1){

1011

perror("setgid");

1561

perror_plus("setgid");

1012

1562

}

1013

1563

1014

1564

/* Lower user privileges (temporarily) */

1015

1565

errno = 0;

1016

1566

ret = seteuid(uid);

1017

1567

if(ret == -1){

1018

perror("seteuid");

1568

perror_plus("seteuid");

1019

1569

}

1020

1570

1021

1571

if(quit_now){

1056

1606

.arg = "SECONDS",

1057

1607

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

1058

1608

.group = 2 },

1609

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

1610

.arg = "SECONDS",

1611

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

1612

.group = 2 },

1613

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

1614

.arg = "DIR",

1615

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

1616

.group = 2 },

1617

/*

1618

* These reproduce what we would get without ARGP_NO_HELP

1619

*/

1620

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

1621

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

1622

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

1623

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

1624

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

1625

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

1059

1626

{ .name = NULL }

1060

1627

};

1061

1628

1062

1629

error_t parse_opt(int key, char *arg,

1063

1630

struct argp_state *state){

1631

errno = 0;

1064

1632

switch(key){

1065

1633

case 128: /* --debug */

1066

1634

debug = true;

1082

1650

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

1083

1651

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

1084

1652

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

1085

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

1086

exit(EXIT_FAILURE);

1653

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

1087

1654

}

1088

1655

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

1089

1656

break;

1094

1661

errno = 0;

1095

1662

delay = strtof(arg, &tmp);

1096

1663

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

1097

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

1098

exit(EXIT_FAILURE);

1099

}

1100

break;

1101

case ARGP_KEY_ARG:

1102

argp_usage(state);

1103

case ARGP_KEY_END:

1664

argp_error(state, "Bad delay");

1665

}

1666

case 132: /* --retry */

1667

errno = 0;

1668

retry_interval = strtod(arg, &tmp);

1669

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

1670

or (retry_interval * 1000) > INT_MAX

1671

or retry_interval < 0){

1672

argp_error(state, "Bad retry interval");

1673

}

1674

break;

1675

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

1676

hookdir = arg;

1677

break;

1678

/*

1679

* These reproduce what we would get without ARGP_NO_HELP

1680

*/

1681

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

1682

argp_state_help(state, state->out_stream,

1683

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1684

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1685

case -3: /* --usage */

1686

argp_state_help(state, state->out_stream,

1687

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1688

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

1689

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

1690

exit(argp_err_exit_status);

1104

1691

break;

1105

1692

default:

1106

1693

return ARGP_ERR_UNKNOWN;

1107

1694

}

1108

return 0;

1695

return errno;

1109

1696

}

1110

1697

1111

1698

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

1112

1699

.args_doc = "",

1113

1700

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

1114

1701

" passwords from a Mandos server" };

1115

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

1116

if(ret == ARGP_ERR_UNKNOWN){

1117

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

1118

exitcode = EXIT_FAILURE;

1119

goto end;

1120

}

1702

ret = argp_parse(&argp, argc, argv,

1703

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1704

switch(ret){

1705

case 0:

1706

break;

1707

case ENOMEM:

1708

default:

1709

errno = ret;

1710

perror_plus("argp_parse");

1711

exitcode = EX_OSERR;

1712

goto end;

1713

case EINVAL:

1714

exitcode = EX_USAGE;

1715

goto end;

1716

}

1717

}

1718

1719

{

1720

/* Work around Debian bug #633582:

1721

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

1722

1723

/* Re-raise priviliges */

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

1728

} else {

1729

struct stat st;

1730

1731

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

1732

int seckey_fd = open(seckey, O_RDONLY);

1733

if(seckey_fd == -1){

1734

perror_plus("open");

1735

} else {

1736

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

1737

if(ret == -1){

1738

perror_plus("fstat");

1739

} else {

1740

if(S_ISREG(st.st_mode)

1741

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

1742

ret = fchown(seckey_fd, uid, gid);

1743

if(ret == -1){

1744

perror_plus("fchown");

1745

}

1746

}

1747

}

1748

TEMP_FAILURE_RETRY(close(seckey_fd));

1749

}

1750

}

1751

1752

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

1753

int pubkey_fd = open(pubkey, O_RDONLY);

1754

if(pubkey_fd == -1){

1755

perror_plus("open");

1756

} else {

1757

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

1758

if(ret == -1){

1759

perror_plus("fstat");

1760

} else {

1761

if(S_ISREG(st.st_mode)

1762

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

1763

ret = fchown(pubkey_fd, uid, gid);

1764

if(ret == -1){

1765

perror_plus("fchown");

1766

}

1767

}

1768

}

1769

TEMP_FAILURE_RETRY(close(pubkey_fd));

1770

}

1771

}

1772

1773

/* Lower privileges */

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1779

}

1780

}

1781

1782

/* Run network hooks */

1783

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

1784

goto end;

1121

1785

}

1122

1786

1123

1787

if(not debug){

1124

1788

avahi_set_log_function(empty_log);

1125

1789

}

1126

1790

1791

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

1792

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1795

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

if(ret >= 1){

1803

/* Pick the first interface returned */

1804

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

1805

if(debug){

1806

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

1807

}

1808

if(interface == NULL){

1809

perror_plus("malloc");

1810

free(direntries);

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

free(direntries);

1815

} else {

1816

free(direntries);

1817

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

1818

exitcode = EXIT_FAILURE;

1819

goto end;

1820

}

1821

}

1822

1127

1823

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

1128

1824

from the signal handler */

1129

1825

/* Initialize the pseudo-RNG for Avahi */

1130

1826

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

1131

1827

mc.simple_poll = avahi_simple_poll_new();

1132

1828

if(mc.simple_poll == NULL){

1133

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

1134

exitcode = EXIT_FAILURE;

1829

fprintf_plus(stderr,

1830

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

1831

exitcode = EX_UNAVAILABLE;

1135

1832

goto end;

1136

1833

}

1137

1834

1138

1835

sigemptyset(&sigterm_action.sa_mask);

1139

1836

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

1140

1837

if(ret == -1){

1141

perror("sigaddset");

1142

exitcode = EXIT_FAILURE;

1838

perror_plus("sigaddset");

1839

exitcode = EX_OSERR;

1143

1840

goto end;

1144

1841

}

1145

1842

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

1146

1843

if(ret == -1){

1147

perror("sigaddset");

1148

exitcode = EXIT_FAILURE;

1844

perror_plus("sigaddset");

1845

exitcode = EX_OSERR;

1149

1846

goto end;

1150

1847

}

1151

1848

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

1152

1849

if(ret == -1){

1153

perror("sigaddset");

1154

exitcode = EXIT_FAILURE;

1850

perror_plus("sigaddset");

1851

exitcode = EX_OSERR;

1155

1852

goto end;

1156

1853

}

1157

1854

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

1160

1857

*/

1161

1858

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

1162

1859

if(ret == -1){

1163

perror("sigaction");

1164

return EXIT_FAILURE;

1860

perror_plus("sigaction");

1861

return EX_OSERR;

1165

1862

}

1166

1863

if(old_sigterm_action.sa_handler != SIG_IGN){

1167

1864

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

1168

1865

if(ret == -1){

1169

perror("sigaction");

1170

exitcode = EXIT_FAILURE;

1866

perror_plus("sigaction");

1867

exitcode = EX_OSERR;

1171

1868

goto end;

1172

1869

}

1173

1870

}

1174

1871

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

1175

1872

if(ret == -1){

1176

perror("sigaction");

1177

return EXIT_FAILURE;

1873

perror_plus("sigaction");

1874

return EX_OSERR;

1178

1875

}

1179

1876

if(old_sigterm_action.sa_handler != SIG_IGN){

1180

1877

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

1181

1878

if(ret == -1){

1182

perror("sigaction");

1183

exitcode = EXIT_FAILURE;

1879

perror_plus("sigaction");

1880

exitcode = EX_OSERR;

1184

1881

goto end;

1185

1882

}

1186

1883

}

1187

1884

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

1188

1885

if(ret == -1){

1189

perror("sigaction");

1190

return EXIT_FAILURE;

1886

perror_plus("sigaction");

1887

return EX_OSERR;

1191

1888

}

1192

1889

if(old_sigterm_action.sa_handler != SIG_IGN){

1193

1890

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

1194

1891

if(ret == -1){

1195

perror("sigaction");

1196

exitcode = EXIT_FAILURE;

1892

perror_plus("sigaction");

1893

exitcode = EX_OSERR;

1197

1894

goto end;

1198

1895

}

1199

1896

}

1200

1897

1201

1898

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

1202

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

1899

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

1203

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1204

1901

if(if_index == 0){

1205

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

1206

exitcode = EXIT_FAILURE;

1902

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

1903

exitcode = EX_UNAVAILABLE;

1207

1904

goto end;

1208

1905

}

1209

1906

1215

1912

errno = 0;

1216

1913

ret = seteuid(0);

1217

1914

if(ret == -1){

1218

perror("seteuid");

1915

perror_plus("seteuid");

1219

1916

}

1220

1917

1221

1918

#ifdef __linux__

1222

1919

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1223

messages to mess up the prompt */

1920

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

1224

1921

ret = klogctl(8, NULL, 5);

1225

1922

bool restore_loglevel = true;

1226

1923

if(ret == -1){

1227

1924

restore_loglevel = false;

1228

perror("klogctl");

1925

perror_plus("klogctl");

1229

1926

}

1230

1927

#endif /* __linux__ */

1231

1928

1232

1929

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1233

1930

if(sd < 0){

1234

perror("socket");

1235

exitcode = EXIT_FAILURE;

1931

perror_plus("socket");

1932

exitcode = EX_OSERR;

1236

1933

#ifdef __linux__

1237

1934

if(restore_loglevel){

1238

1935

ret = klogctl(7, NULL, 0);

1239

1936

if(ret == -1){

1240

perror("klogctl");

1937

perror_plus("klogctl");

1241

1938

}

1242

1939

}

1243

1940

#endif /* __linux__ */

1245

1942

errno = 0;

1246

1943

ret = seteuid(uid);

1247

1944

if(ret == -1){

1248

perror("seteuid");

1945

perror_plus("seteuid");

1249

1946

}

1250

1947

goto end;

1251

1948

}

1252

1949

strcpy(network.ifr_name, interface);

1253

1950

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

1254

1951

if(ret == -1){

1255

perror("ioctl SIOCGIFFLAGS");

1952

perror_plus("ioctl SIOCGIFFLAGS");

1256

1953

#ifdef __linux__

1257

1954

if(restore_loglevel){

1258

1955

ret = klogctl(7, NULL, 0);

1259

1956

if(ret == -1){

1260

perror("klogctl");

1957

perror_plus("klogctl");

1261

1958

}

1262

1959

}

1263

1960

#endif /* __linux__ */

1264

exitcode = EXIT_FAILURE;

1961

exitcode = EX_OSERR;

1265

1962

/* Lower privileges */

1266

1963

errno = 0;

1267

1964

ret = seteuid(uid);

1268

1965

if(ret == -1){

1269

perror("seteuid");

1966

perror_plus("seteuid");

1270

1967

}

1271

1968

goto end;

1272

1969

}

1276

1973

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

1277

1974

if(ret == -1){

1278

1975

take_down_interface = false;

1279

perror("ioctl SIOCSIFFLAGS");

1280

exitcode = EXIT_FAILURE;

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1977

exitcode = EX_OSERR;

1281

1978

#ifdef __linux__

1282

1979

if(restore_loglevel){

1283

1980

ret = klogctl(7, NULL, 0);

1284

1981

if(ret == -1){

1285

perror("klogctl");

1982

perror_plus("klogctl");

1286

1983

}

1287

1984

}

1288

1985

#endif /* __linux__ */

1290

1987

errno = 0;

1291

1988

ret = seteuid(uid);

1292

1989

if(ret == -1){

1293

perror("seteuid");

1990

perror_plus("seteuid");

1294

1991

}

1295

1992

goto end;

1296

1993

}

1297

1994

}

1298

/* sleep checking until interface is running */

1995

/* Sleep checking until interface is running.

1996

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

1299

1997

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

1300

1998

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

1301

1999

if(ret == -1){

1302

perror("ioctl SIOCGIFFLAGS");

2000

perror_plus("ioctl SIOCGIFFLAGS");

1303

2001

} else if(network.ifr_flags & IFF_RUNNING){

1304

2002

break;

1305

2003

}

1306

2004

struct timespec sleeptime = { .tv_nsec = 250000000 };

1307

2005

ret = nanosleep(&sleeptime, NULL);

1308

2006

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

1309

perror("nanosleep");

2007

perror_plus("nanosleep");

1310

2008

}

1311

2009

}

1312

2010

if(not take_down_interface){

1313

2011

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

1314

2012

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

1315

2013

if(ret == -1){

1316

perror("close");

2014

perror_plus("close");

1317

2015

}

1318

2016

}

1319

2017

#ifdef __linux__

1321

2019

/* Restores kernel loglevel to default */

1322

2020

ret = klogctl(7, NULL, 0);

1323

2021

if(ret == -1){

1324

perror("klogctl");

2022

perror_plus("klogctl");

1325

2023

}

1326

2024

}

1327

2025

#endif /* __linux__ */

1328

2026

/* Lower privileges */

1329

2027

errno = 0;

1330

if(take_down_interface){

1331

/* Lower privileges */

1332

ret = seteuid(uid);

1333

if(ret == -1){

1334

perror("seteuid");

1335

}

1336

} else {

1337

/* Lower privileges permanently */

1338

ret = setuid(uid);

1339

if(ret == -1){

1340

perror("setuid");

1341

}

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

1342

2032

}

1343

2033

}

1344

2034

1348

2038

1349

2039

ret = init_gnutls_global(pubkey, seckey);

1350

2040

if(ret == -1){

1351

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

1352

exitcode = EXIT_FAILURE;

2041

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

2042

exitcode = EX_UNAVAILABLE;

1353

2043

goto end;

1354

2044

} else {

1355

2045

gnutls_initialized = true;

1359

2049

goto end;

1360

2050

}

1361

2051

2052

if(mkdtemp(tempdir) == NULL){

2053

perror_plus("mkdtemp");

2054

goto end;

2055

}

1362

2056

tempdir_created = true;

1363

if(mkdtemp(tempdir) == NULL){

1364

tempdir_created = false;

1365

perror("mkdtemp");

1366

goto end;

1367

}

1368

2057

1369

2058

if(quit_now){

1370

2059

goto end;

1371

2060

}

1372

2061

1373

2062

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

1374

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

1375

exitcode = EXIT_FAILURE;

2063

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

2064

exitcode = EX_UNAVAILABLE;

1376

2065

goto end;

1377

2066

} else {

1378

2067

gpgme_initialized = true;

1387

2076

/* (Mainly meant for debugging) */

1388

2077

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

1389

2078

if(address == NULL){

1390

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

1391

exitcode = EXIT_FAILURE;

2079

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

2080

exitcode = EX_USAGE;

1392

2081

goto end;

1393

2082

}

1394

2083

1401

2090

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

1402

2091

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

1403

2092

or tmpmax != (uint16_t)tmpmax){

1404

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

1405

exitcode = EXIT_FAILURE;

2093

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

2094

exitcode = EX_USAGE;

1406

2095

goto end;

1407

2096

}

1408

2097

1412

2101

1413

2102

port = (uint16_t)tmpmax;

1414

2103

*address = '\0';

1415

address = connect_to;

1416

2104

/* Colon in address indicates IPv6 */

1417

2105

int af;

1418

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

2106

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

1419

2107

af = AF_INET6;

2108

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

2109

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

2110

{

2111

connect_to++;

2112

address[-1] = '\0';

2113

}

1420

2114

} else {

1421

2115

af = AF_INET;

1422

2116

}

2117

address = connect_to;

1423

2118

1424

2119

if(quit_now){

1425

2120

goto end;

1426

2121

}

1427

2122

1428

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

1429

if(ret < 0){

1430

exitcode = EXIT_FAILURE;

1431

} else {

2123

while(not quit_now){

2124

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

2125

if(quit_now or ret == 0){

2126

break;

2127

}

2128

if(debug){

2129

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

2130

(int)retry_interval);

2131

}

2132

sleep((int)retry_interval);

2133

}

2134

2135

if (not quit_now){

1432

2136

exitcode = EXIT_SUCCESS;

1433

2137

}

2138

1434

2139

goto end;

1435

2140

}

1436

2141

1458

2163

1459

2164

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

1460

2165

if(mc.server == NULL){

1461

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

1462

avahi_strerror(error));

1463

exitcode = EXIT_FAILURE;

2166

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

2167

avahi_strerror(error));

2168

exitcode = EX_UNAVAILABLE;

1464

2169

goto end;

1465

2170

}

1466

2171

1473

2178

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1474

2179

NULL, 0, browse_callback, NULL);

1475

2180

if(sb == NULL){

1476

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

1477

avahi_strerror(avahi_server_errno(mc.server)));

1478

exitcode = EXIT_FAILURE;

2181

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

2182

avahi_strerror(avahi_server_errno(mc.server)));

2183

exitcode = EX_UNAVAILABLE;

1479

2184

goto end;

1480

2185

}

1481

2186

1486

2191

/* Run the main loop */

1487

2192

1488

2193

if(debug){

1489

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

1490

}

1491

1492

avahi_simple_poll_loop(mc.simple_poll);

2194

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

2195

}

2196

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

2199

if(debug){

2200

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

2201

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

2202

}

1493

2203

1494

2204

end:

1495

2205

1496

2206

if(debug){

1497

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

2207

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

1498

2208

}

1499

2209

1500

2210

/* Cleanup things */

1517

2227

gpgme_release(mc.ctx);

1518

2228

}

1519

2229

1520

/* Take down the network interface */

1521

if(take_down_interface){

1522

/* Re-raise priviliges */

2230

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

2231

has seen */

2232

if(mc.current_server != NULL){

2233

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

2234

while(mc.current_server != NULL){

2235

server *next = mc.current_server->next;

2236

free(mc.current_server);

2237

mc.current_server = next;

2238

}

2239

}

2240

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2244

/* Re-raise priviliges */

2245

{

1523

2246

errno = 0;

1524

2247

ret = seteuid(0);

1525

2248

if(ret == -1){

1526

perror("seteuid");

2249

perror_plus("seteuid");

1527

2250

}

1528

if(geteuid() == 0){

2251

2252

/* Take down the network interface */

2253

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

1529

2254

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

1530

2255

if(ret == -1){

1531

perror("ioctl SIOCGIFFLAGS");

1532

} else if(network.ifr_flags & IFF_UP) {

1533

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

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

2258

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

1534

2259

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

1535

2260

if(ret == -1){

1536

perror("ioctl SIOCSIFFLAGS");

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1537

2262

}

1538

2263

}

1539

2264

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

1540

2265

if(ret == -1){

1541

perror("close");

1542

}

1543

/* Lower privileges permanently */

1544

errno = 0;

1545

ret = setuid(uid);

1546

if(ret == -1){

1547

perror("setuid");

2266

perror_plus("close");

1548

2267

}

1549

2268

}

1550

2269

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

1551

2276

1552

/* Removes the temp directory used by GPGME */

2277

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

1553

2278

if(tempdir_created){

1554

DIR *d;

1555

struct dirent *direntry;

1556

d = opendir(tempdir);

1557

if(d == NULL){

1558

if(errno != ENOENT){

1559

perror("opendir");

1560

}

1561

} else {

1562

while(true){

1563

direntry = readdir(d);

1564

if(direntry == NULL){

1565

break;

1566

}

1567

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

1568

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

1569

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

1570

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

1571

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

1572

continue;

1573

}

2279

struct dirent **direntries = NULL;

2280

struct dirent *direntry = NULL;

2281

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

2282

alphasort);

2283

if (numentries > 0){

2284

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

2285

direntry = direntries[i];

1574

2286

char *fullname = NULL;

1575

2287

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

1576

2288

direntry->d_name);

1577

2289

if(ret < 0){

1578

perror("asprintf");

2290

perror_plus("asprintf");

1579

2291

continue;

1580

2292

}

1581

2293

ret = remove(fullname);

1582

2294

if(ret == -1){

1583

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

1584

strerror(errno));

2295

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

2296

strerror(errno));

1585

2297

}

1586

2298

free(fullname);

1587

2299

}

1588

closedir(d);

2300

}

2301

2302

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

2303

free(direntries);

2304

if (numentries == -1){

2305

perror_plus("scandir");

1589

2306

}

1590

2307

ret = rmdir(tempdir);

1591

2308

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

1592

perror("rmdir");

2309

perror_plus("rmdir");

1593

2310

}

1594

2311

}

1595

2312

1600

2317

&old_sigterm_action,

1601

2318

NULL));

1602

2319

if(ret == -1){

1603

perror("sigaction");

2320

perror_plus("sigaction");

1604

2321

}

1605

2322

do {

1606

2323

ret = raise(signal_received);

1607

2324

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

1608

2325

if(ret != 0){

1609

perror("raise");

2326

perror_plus("raise");

1610

2327

abort();

1611

2328

}

1612

2329

TEMP_FAILURE_RETRY(pause());