/mandos/release : revision 237.16.21

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

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*

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* Everything else is

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*

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* This program is free software: you can redistribute it and/or

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* modify it under the terms of the GNU General Public License as

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* along with this program. If not, see

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

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*

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

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

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*/

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32

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

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stdout, ferror(), remove() */

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

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#include <stddef.h> /* NULL, size_t, ssize_t */

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

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srand(), strtof(), 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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74

#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() */

77

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

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

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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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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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91

86

92

#ifdef __linux__

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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 */

112

118

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

120

126

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

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127

#define SECKEY "seckey.txt"

122

128

#define PUBKEY "pubkey.txt"

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

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130

124

131

bool debug = false;

125

132

static const char mandos_protocol_version[] = "1";

126

133

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

127

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

134

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

135

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;

144

int af;

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struct timespec last_seen;

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struct server *next;

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struct server *prev;

148

} server;

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149

129

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

130

151

typedef struct {

135

156

gnutls_dh_params_t dh_params;

136

157

const char *priority;

137

158

gpgme_ctx_t ctx;

159

server *current_server;

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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"

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

165

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

166

.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

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

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program_invocation_short_name);

175

perror(print_text);

176

}

177

178

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

179

va_list ap;

180

va_start (ap, format);

181

182

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

183

program_invocation_short_name));

184

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

185

}

186

148

187

/*

149

188

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

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189

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

151

190

* "buffer_length" is how much is already used.

152

191

*/

153

192

size_t incbuffer(char **buffer, size_t buffer_length,

154

size_t buffer_capacity){

193

size_t buffer_capacity){

155

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

156

195

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

157

196

if(buffer == NULL){

162

201

return buffer_capacity;

163

202

}

164

203

204

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

205

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

206

int af){

207

int ret;

208

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

209

if(new_server == NULL){

210

perror_plus("malloc");

211

return -1;

212

}

213

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

214

.port = port,

215

.if_index = if_index,

216

.af = af };

217

if(new_server->ip == NULL){

218

perror_plus("strdup");

219

return -1;

220

}

221

/* Special case of first server */

222

if (mc.current_server == NULL){

223

new_server->next = new_server;

224

new_server->prev = new_server;

225

mc.current_server = new_server;

226

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

227

} else {

228

new_server->next = mc.current_server;

229

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

230

new_server->prev->next = new_server;

231

mc.current_server->prev = new_server;

232

}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return -1;

237

}

238

return 0;

239

}

240

165

241

/*

166

242

* Initialize GPGME.

167

243

*/

168

static bool init_gpgme(const char *seckey,

169

const char *pubkey, const char *tempdir){

244

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

245

const char *tempdir){

170

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gpgme_error_t rc;

171

247

gpgme_engine_info_t engine_info;

172

248

181

257

182

258

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

183

259

if(fd == -1){

184

perror("open");

260

perror_plus("open");

185

261

return false;

186

262

}

187

263

188

264

rc = gpgme_data_new_from_fd(&pgp_data, fd);

189

265

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));

266

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

267

gpgme_strsource(rc), gpgme_strerror(rc));

192

268

return false;

193

269

}

194

270

195

271

rc = gpgme_op_import(mc.ctx, pgp_data);

196

272

if(rc != GPG_ERR_NO_ERROR){

197

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

198

gpgme_strsource(rc), gpgme_strerror(rc));

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

199

275

return false;

200

276

}

201

277

202

278

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

203

279

if(ret == -1){

204

perror("close");

280

perror_plus("close");

205

281

}

206

282

gpgme_data_release(pgp_data);

207

283

return true;

208

284

}

209

285

210

286

if(debug){

211

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

287

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

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288

}

213

289

214

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/* Init GPGME */

215

291

gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

217

293

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));

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

220

296

return false;

221

297

}

222

298

223

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

299

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

224

300

rc = gpgme_get_engine_info(&engine_info);

225

301

if(rc != GPG_ERR_NO_ERROR){

226

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

227

gpgme_strsource(rc), gpgme_strerror(rc));

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

228

304

return false;

229

305

}

230

306

while(engine_info != NULL){

236

312

engine_info = engine_info->next;

237

313

}

238

314

if(engine_info == NULL){

239

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

315

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

316

tempdir);

240

317

return false;

241

318

}

242

319

243

320

/* Create new GPGME "context" */

244

321

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

245

322

if(rc != GPG_ERR_NO_ERROR){

246

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

247

gpgme_strsource(rc), gpgme_strerror(rc));

323

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

324

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

325

gpgme_strerror(rc));

248

326

return false;

249

327

}

250

328

269

347

ssize_t plaintext_length = 0;

270

348

271

349

if(debug){

272

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

350

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

273

351

}

274

352

275

353

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

276

354

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

277

355

0);

278

356

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));

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

281

359

return -1;

282

360

}

283

361

284

362

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

285

363

rc = gpgme_data_new(&dh_plain);

286

364

if(rc != GPG_ERR_NO_ERROR){

287

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

288

gpgme_strsource(rc), gpgme_strerror(rc));

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

289

368

gpgme_data_release(dh_crypto);

290

369

return -1;

291

370

}

294

373

data buffer */

295

374

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

296

375

if(rc != GPG_ERR_NO_ERROR){

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

299

378

plaintext_length = -1;

300

379

if(debug){

301

380

gpgme_decrypt_result_t result;

302

381

result = gpgme_op_decrypt_result(mc.ctx);

303

382

if(result == NULL){

304

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

383

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

305

384

} 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);

385

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

386

result->unsupported_algorithm);

387

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

388

result->wrong_key_usage);

310

389

if(result->file_name != NULL){

311

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

390

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

312

391

}

313

392

gpgme_recipient_t recipient;

314

393

recipient = result->recipients;

315

394

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");

395

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

396

gpgme_pubkey_algo_name

397

(recipient->pubkey_algo));

398

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

399

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

400

recipient->status == GPG_ERR_NO_SECKEY

401

? "No" : "Yes");

322

402

recipient = recipient->next;

323

403

}

324

404

}

327

407

}

328

408

329

409

if(debug){

330

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

410

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

331

411

}

332

412

333

413

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

334

414

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

335

perror("gpgme_data_seek");

415

perror_plus("gpgme_data_seek");

336

416

plaintext_length = -1;

337

417

goto decrypt_end;

338

418

}

340

420

*plaintext = NULL;

341

421

while(true){

342

422

plaintext_capacity = incbuffer(plaintext,

343

(size_t)plaintext_length,

344

plaintext_capacity);

423

(size_t)plaintext_length,

424

plaintext_capacity);

345

425

if(plaintext_capacity == 0){

346

perror("incbuffer");

347

plaintext_length = -1;

348

goto decrypt_end;

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

349

429

}

350

430

351

431

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

356

436

break;

357

437

}

358

438

if(ret < 0){

359

perror("gpgme_data_read");

439

perror_plus("gpgme_data_read");

360

440

plaintext_length = -1;

361

441

goto decrypt_end;

362

442

}

364

444

}

365

445

366

446

if(debug){

367

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

447

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

368

448

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

369

449

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

370

450

}

392

472

/* GnuTLS log function callback */

393

473

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

394

474

const char* string){

395

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

475

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

396

476

}

397

477

398

478

static int init_gnutls_global(const char *pubkeyfilename,

400

480

int ret;

401

481

402

482

if(debug){

403

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

483

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

404

484

}

405

485

406

486

ret = gnutls_global_init();

407

487

if(ret != GNUTLS_E_SUCCESS){

408

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

409

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

410

490

return -1;

411

491

}

412

492

419

499

}

420

500

421

501

/* OpenPGP credentials */

422

gnutls_certificate_allocate_credentials(&mc.cred);

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

423

503

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));

504

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

505

safer_gnutls_strerror(ret));

429

506

gnutls_global_deinit();

430

507

return -1;

431

508

}

432

509

433

510

if(debug){

434

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

435

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

436

seckeyfilename);

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

437

515

}

438

516

439

517

ret = gnutls_certificate_set_openpgp_key_file

440

518

(mc.cred, pubkeyfilename, seckeyfilename,

441

519

GNUTLS_OPENPGP_FMT_BASE64);

442

520

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));

521

fprintf_plus(stderr,

522

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

523

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

524

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

525

safer_gnutls_strerror(ret));

448

526

goto globalfail;

449

527

}

450

528

451

529

/* GnuTLS server initialization */

452

530

ret = gnutls_dh_params_init(&mc.dh_params);

453

531

if(ret != GNUTLS_E_SUCCESS){

454

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

455

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

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

456

535

goto globalfail;

457

536

}

458

537

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

459

538

if(ret != GNUTLS_E_SUCCESS){

460

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

461

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

462

541

goto globalfail;

463

542

}

464

543

484

563

}

485

564

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

486

565

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

489

569

}

490

570

491

571

{

498

578

}

499

579

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

500

580

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));

581

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

582

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

583

safer_gnutls_strerror(ret));

504

584

gnutls_deinit(*session);

505

585

return -1;

506

586

}

515

595

}

516

596

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

517

597

if(ret != GNUTLS_E_SUCCESS){

518

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

519

safer_gnutls_strerror(ret));

598

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

599

safer_gnutls_strerror(ret));

520

600

gnutls_deinit(*session);

521

601

return -1;

522

602

}

552

632

gnutls_session_t session;

553

633

int pf; /* Protocol family */

554

634

635

errno = 0;

636

555

637

if(quit_now){

638

errno = EINTR;

556

639

return -1;

557

640

}

558

641

564

647

pf = PF_INET;

565

648

break;

566

649

default:

567

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

650

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

651

errno = EINVAL;

568

652

return -1;

569

653

}

570

654

574

658

}

575

659

576

660

if(debug){

577

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

578

"\n", ip, port);

661

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

662

PRIu16 "\n", ip, port);

579

663

}

580

664

581

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

582

666

if(tcp_sd < 0){

583

perror("socket");

667

int e = errno;

668

perror_plus("socket");

669

errno = e;

584

670

goto mandos_end;

585

671

}

586

672

587

673

if(quit_now){

674

errno = EINTR;

588

675

goto mandos_end;

589

676

}

590

677

597

684

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

598

685

}

599

686

if(ret < 0 ){

600

perror("inet_pton");

687

int e = errno;

688

perror_plus("inet_pton");

689

errno = e;

601

690

goto mandos_end;

602

691

}

603

692

if(ret == 0){

604

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

693

int e = errno;

694

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

695

errno = e;

605

696

goto mandos_end;

606

697

}

607

698

if(af == AF_INET6){

611

702

612

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

613

704

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

614

-Wunreachable-code*/

705

-Wunreachable-code*/

615

706

if(if_index == AVAHI_IF_UNSPEC){

616

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

617

" without a network interface\n");

707

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

708

" incomplete without a network interface\n");

709

errno = EINVAL;

618

710

goto mandos_end;

619

711

}

620

712

/* Set the network interface number as scope */

627

719

}

628

720

629

721

if(quit_now){

722

errno = EINTR;

630

723

goto mandos_end;

631

724

}

632

725

634

727

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

635

728

char interface[IF_NAMESIZE];

636

729

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

637

perror("if_indextoname");

730

perror_plus("if_indextoname");

638

731

} else {

639

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

640

ip, interface, port);

732

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

733

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

641

734

}

642

735

} else {

643

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

644

port);

736

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

737

ip, port);

645

738

}

646

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

647

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

654

747

sizeof(addrstr));

655

748

}

656

749

if(pcret == NULL){

657

perror("inet_ntop");

750

perror_plus("inet_ntop");

658

751

} else {

659

752

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

660

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

753

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

661

754

}

662

755

}

663

756

}

664

757

665

758

if(quit_now){

759

errno = EINTR;

666

760

goto mandos_end;

667

761

}

668

762

672

766

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

673

767

}

674

768

if(ret < 0){

675

perror("connect");

769

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

770

int e = errno;

771

perror_plus("connect");

772

errno = e;

773

}

676

774

goto mandos_end;

677

775

}

678

776

679

777

if(quit_now){

778

errno = EINTR;

680

779

goto mandos_end;

681

780

}

682

781

685

784

while(true){

686

785

size_t out_size = strlen(out);

687

786

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

688

out_size - written));

787

out_size - written));

689

788

if(ret == -1){

690

perror("write");

789

int e = errno;

790

perror_plus("write");

791

errno = e;

691

792

goto mandos_end;

692

793

}

693

794

written += (size_t)ret;

703

804

}

704

805

705

806

if(quit_now){

807

errno = EINTR;

706

808

goto mandos_end;

707

809

}

708

810

}

709

811

710

812

if(debug){

711

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

813

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

712

814

}

713

815

714

816

if(quit_now){

817

errno = EINTR;

715

818

goto mandos_end;

716

819

}

717

820

821

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

718

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

719

823

720

824

if(quit_now){

825

errno = EINTR;

721

826

goto mandos_end;

722

827

}

723

828

724

829

do {

725

830

ret = gnutls_handshake(session);

726

831

if(quit_now){

832

errno = EINTR;

727

833

goto mandos_end;

728

834

}

729

835

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

730

836

731

837

if(ret != GNUTLS_E_SUCCESS){

732

838

if(debug){

733

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

839

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

734

840

gnutls_perror(ret);

735

841

}

842

errno = EPROTO;

736

843

goto mandos_end;

737

844

}

738

845

739

846

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

740

847

741

848

if(debug){

742

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

743

ip);

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

744

851

}

745

852

746

853

while(true){

747

854

748

855

if(quit_now){

856

errno = EINTR;

749

857

goto mandos_end;

750

858

}

751

859

752

860

buffer_capacity = incbuffer(&buffer, buffer_length,

753

buffer_capacity);

861

buffer_capacity);

754

862

if(buffer_capacity == 0){

755

perror("incbuffer");

863

int e = errno;

864

perror_plus("incbuffer");

865

errno = e;

756

866

goto mandos_end;

757

867

}

758

868

759

869

if(quit_now){

870

errno = EINTR;

760

871

goto mandos_end;

761

872

}

762

873

775

886

ret = gnutls_handshake(session);

776

887

777

888

if(quit_now){

889

errno = EINTR;

778

890

goto mandos_end;

779

891

}

780

892

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

781

893

if(ret < 0){

782

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

894

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

895

"***\n");

783

896

gnutls_perror(ret);

897

errno = EPROTO;

784

898

goto mandos_end;

785

899

}

786

900

break;

787

901

default:

788

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

789

" encrypted session with Mandos server\n");

902

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

903

" encrypted session with Mandos server\n");

790

904

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

errno = EIO;

791

906

goto mandos_end;

792

907

}

793

908

} else {

796

911

}

797

912

798

913

if(debug){

799

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

914

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

800

915

}

801

916

802

917

if(quit_now){

918

errno = EINTR;

803

919

goto mandos_end;

804

920

}

805

921

806

922

do {

807

923

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

808

924

if(quit_now){

925

errno = EINTR;

809

926

goto mandos_end;

810

927

}

811

928

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

812

929

813

930

if(buffer_length > 0){

814

931

ssize_t decrypted_buffer_size;

815

decrypted_buffer_size = pgp_packet_decrypt(buffer,

816

buffer_length,

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

817

933

&decrypted_buffer);

818

934

if(decrypted_buffer_size >= 0){

819

935

820

936

written = 0;

821

937

while(written < (size_t) decrypted_buffer_size){

822

938

if(quit_now){

939

errno = EINTR;

823

940

goto mandos_end;

824

941

}

825

942

827

944

(size_t)decrypted_buffer_size - written,

828

945

stdout);

829

946

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

947

int e = errno;

830

948

if(debug){

831

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

832

strerror(errno));

949

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

950

strerror(errno));

833

951

}

952

errno = e;

834

953

goto mandos_end;

835

954

}

836

955

written += (size_t)ret;

842

961

/* Shutdown procedure */

843

962

844

963

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;

964

{

965

int e = errno;

966

free(decrypted_buffer);

967

free(buffer);

968

if(tcp_sd >= 0){

969

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

970

}

971

if(ret == -1){

972

if(e == 0){

973

e = errno;

974

}

975

perror_plus("close");

976

}

977

gnutls_deinit(session);

978

errno = e;

979

if(quit_now){

980

errno = EINTR;

981

retval = -1;

982

}

856

983

}

857

984

return retval;

858

985

}

883

1010

switch(event){

884

1011

default:

885

1012

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)));

1013

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

1014

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

1015

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

889

1017

break;

890

1018

891

1019

case AVAHI_RESOLVER_FOUND:

893

1021

char ip[AVAHI_ADDRESS_STR_MAX];

894

1022

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

895

1023

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);

1024

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

1025

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

1026

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

899

1027

}

900

1028

int ret = start_mandos_communication(ip, port, interface,

901

1029

avahi_proto_to_af(proto));

902

1030

if(ret == 0){

903

1031

avahi_simple_poll_quit(mc.simple_poll);

1032

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

904

1035

}

905

1036

}

906

1037

}

930

1061

default:

931

1062

case AVAHI_BROWSER_FAILURE:

932

1063

933

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

934

avahi_strerror(avahi_server_errno(mc.server)));

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

935

1066

avahi_simple_poll_quit(mc.simple_poll);

936

1067

return;

937

1068

944

1075

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

945

1076

name, type, domain, protocol, 0,

946

1077

resolve_callback, NULL) == NULL)

947

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

948

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

1078

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

1079

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

949

1081

break;

950

1082

951

1083

case AVAHI_BROWSER_REMOVE:

954

1086

case AVAHI_BROWSER_ALL_FOR_NOW:

955

1087

case AVAHI_BROWSER_CACHE_EXHAUSTED:

956

1088

if(debug){

957

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

1089

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

1090

" searching...\n");

958

1091

}

959

1092

break;

960

1093

}

961

1094

}

962

1095

963

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

1096

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

964

1097

static void handle_sigterm(int sig){

965

1098

if(quit_now){

966

1099

return;

968

1101

quit_now = 1;

969

1102

signal_received = sig;

970

1103

int old_errno = errno;

1104

/* set main loop to exit */

971

1105

if(mc.simple_poll != NULL){

972

1106

avahi_simple_poll_quit(mc.simple_poll);

973

1107

}

974

1108

errno = old_errno;

975

1109

}

976

1110

1111

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

1112

int ret;

1113

1114

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

1115

if(s < 0){

1116

perror_plus("socket");

1117

return false;

1118

}

1119

strcpy(ifr->ifr_name, ifname);

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

if(ret == -1){

1122

if(debug){

1123

perror_plus("ioctl SIOCGIFFLAGS");

1124

}

1125

return false;

1126

}

1127

return true;

1128

}

1129

1130

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

1131

1132

/* Reject the loopback device */

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1134

if(debug){

1135

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

1136

ifname);

1137

}

1138

return false;

1139

}

1140

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

1141

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

1142

if(debug){

1143

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

1144

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

1145

}

1146

return true;

1147

}

1148

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

1149

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

1150

if(debug){

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1153

}

1154

return false;

1155

}

1156

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

1157

if(ifr->ifr_flags & IFF_NOARP){

1158

if(debug){

1159

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

1160

ifname);

1161

}

1162

return false;

1163

}

1164

1165

/* Accept this device */

1166

if(debug){

1167

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

1168

}

1169

return true;

1170

}

1171

1172

/*

1173

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

1174

* corresponds to an acceptable network device.

1175

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

1176

*/

1177

int good_interface(const struct dirent *if_entry){

1178

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

1179

return 0;

1180

}

1181

1182

struct ifreq ifr;

1183

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

1184

if(debug){

1185

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

1186

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

1187

}

1188

return 0;

1189

}

1190

1191

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

1192

return 0;

1193

}

1194

return 1;

1195

}

1196

1197

/*

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1236

}

1237

return 1;

1238

}

1239

1240

int notdotentries(const struct dirent *direntry){

1241

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

1242

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

1243

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

1244

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

1245

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

1246

return 0;

1247

}

1248

return 1;

1249

}

1250

1251

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

1252

int runnable_hook(const struct dirent *direntry){

1253

int ret;

1254

size_t sret;

1255

struct stat st;

1256

1257

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

1258

/* Empty name? */

1259

return 0;

1260

}

1261

1262

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

1263

"abcdefghijklmnopqrstuvwxyz"

1264

"0123456789"

1265

"_-");

1266

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

1267

/* Contains non-allowed characters */

1268

if(debug){

1269

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

1270

direntry->d_name);

1271

}

1272

return 0;

1273

}

1274

1275

char *fullname = NULL;

1276

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

1277

if(ret < 0){

1278

perror_plus("asprintf");

1279

return 0;

1280

}

1281

1282

ret = stat(fullname, &st);

1283

if(ret == -1){

1284

if(debug){

1285

perror_plus("Could not stat hook");

1286

}

1287

return 0;

1288

}

1289

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

1290

/* Not a regular file */

1291

if(debug){

1292

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

1293

direntry->d_name);

1294

}

1295

return 0;

1296

}

1297

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

1298

/* Not executable */

1299

if(debug){

1300

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

1301

direntry->d_name);

1302

}

1303

return 0;

1304

}

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 1;

1310

}

1311

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1313

int ret;

1314

struct timespec now;

1315

struct timespec waited_time;

1316

intmax_t block_time;

1317

1318

while(true){

1319

if(mc.current_server == NULL){

1320

if (debug){

1321

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

1322

" No timeout!\n");

1323

}

1324

ret = avahi_simple_poll_iterate(s, -1);

1325

} else {

1326

if (debug){

1327

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

1328

" it, or wait\n");

1329

}

1330

/* the current time */

1331

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1332

if(ret == -1){

1333

perror_plus("clock_gettime");

1334

return -1;

1335

}

1336

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

1337

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

1338

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1340

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1342

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

1343

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

1344

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

1345

block_time = ((retry_interval

1346

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

1347

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

1348

1349

if (debug){

1350

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

1351

block_time);

1352

}

1353

1354

if(block_time <= 0){

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1359

if(ret == 0){

1360

avahi_simple_poll_quit(mc.simple_poll);

1361

return 0;

1362

}

1363

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1365

if(ret == -1){

1366

perror_plus("clock_gettime");

1367

return -1;

1368

}

1369

mc.current_server = mc.current_server->next;

1370

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

1371

servers, but don't block */

1372

}

1373

1374

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

1375

}

1376

if(ret != 0){

1377

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

1378

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

1379

}

1380

}

1381

}

1382

}

1383

1384

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

1385

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1391

if(numhooks == -1){

1392

perror_plus("scandir");

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

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

1399

if(ret < 0){

1400

perror_plus("asprintf");

1401

continue;

1402

}

1403

if(debug){

1404

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

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

dup2(devnull, STDIN_FILENO);

1435

close(devnull);

1436

dup2(STDERR_FILENO, STDOUT_FILENO);

1437

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

1438

if(ret == -1){

1439

perror_plus("setenv");

1440

_exit(EX_OSERR);

1441

}

1442

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

1443

if(ret == -1){

1444

perror_plus("setenv");

1445

_exit(EX_OSERR);

1446

}

1447

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

1448

if(ret == -1){

1449

perror_plus("setenv");

1450

_exit(EX_OSERR);

1451

}

1452

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

1453

if(ret == -1){

1454

perror_plus("setenv");

1455

_exit(EX_OSERR);

1456

}

1457

char *delaystring;

1458

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

1459

if(ret == -1){

1460

perror_plus("asprintf");

1461

_exit(EX_OSERR);

1462

}

1463

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

1464

if(ret == -1){

1465

free(delaystring);

1466

perror_plus("setenv");

1467

_exit(EX_OSERR);

1468

}

1469

free(delaystring);

1470

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

1471

perror_plus("execl");

1472

} else {

1473

int status;

1474

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

1475

perror_plus("waitpid");

1476

free(fullname);

1477

continue;

1478

}

1479

if(WIFEXITED(status)){

1480

if(WEXITSTATUS(status) != 0){

1481

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

1482

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

1483

WEXITSTATUS(status));

1484

free(fullname);

1485

continue;

1486

}

1487

} else if(WIFSIGNALED(status)){

1488

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

1489

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

1490

WTERMSIG(status));

1491

free(fullname);

1492

continue;

1493

} else {

1494

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

1495

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

1496

free(fullname);

1497

continue;

1498

}

1499

}

1500

free(fullname);

1501

if(debug){

1502

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

1503

direntry->d_name);

1504

}

1505

}

1506

close(devnull);

1507

}

1508

return true;

1509

}

1510

977

1511

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

978

1512

AvahiSServiceBrowser *sb = NULL;

979

1513

int error;

981

1515

intmax_t tmpmax;

982

1516

char *tmp;

983

1517

int exitcode = EXIT_SUCCESS;

984

const char *interface = "eth0";

1518

const char *interface = "";

985

1519

struct ifreq network;

986

1520

int sd = -1;

987

1521

bool take_down_interface = false;

988

1522

uid_t uid;

989

1523

gid_t gid;

990

char *connect_to = NULL;

991

1524

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

992

1525

bool tempdir_created = false;

993

1526

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

997

1530

bool gnutls_initialized = false;

998

1531

bool gpgme_initialized = false;

999

1532

float delay = 2.5f;

1533

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

1534

retrying the same server again */

1000

1535

1001

1536

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1002

1537

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1008

1543

errno = 0;

1009

1544

ret = setgid(gid);

1010

1545

if(ret == -1){

1011

perror("setgid");

1546

perror_plus("setgid");

1012

1547

}

1013

1548

1014

1549

/* Lower user privileges (temporarily) */

1015

1550

errno = 0;

1016

1551

ret = seteuid(uid);

1017

1552

if(ret == -1){

1018

perror("seteuid");

1553

perror_plus("seteuid");

1019

1554

}

1020

1555

1021

1556

if(quit_now){

1056

1591

.arg = "SECONDS",

1057

1592

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

1058

1593

.group = 2 },

1594

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

1595

.arg = "SECONDS",

1596

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

1597

.group = 2 },

1598

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

1599

.arg = "DIR",

1600

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

1601

.group = 2 },

1602

/*

1603

* These reproduce what we would get without ARGP_NO_HELP

1604

*/

1605

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

1606

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

1607

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

1608

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

1609

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

1610

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

1059

1611

{ .name = NULL }

1060

1612

};

1061

1613

1062

1614

error_t parse_opt(int key, char *arg,

1063

1615

struct argp_state *state){

1616

errno = 0;

1064

1617

switch(key){

1065

1618

case 128: /* --debug */

1066

1619

debug = true;

1082

1635

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

1083

1636

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

1084

1637

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

1085

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

1086

exit(EXIT_FAILURE);

1638

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

1087

1639

}

1088

1640

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

1089

1641

break;

1094

1646

errno = 0;

1095

1647

delay = strtof(arg, &tmp);

1096

1648

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:

1649

argp_error(state, "Bad delay");

1650

}

1651

case 132: /* --retry */

1652

errno = 0;

1653

retry_interval = strtod(arg, &tmp);

1654

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

1655

or (retry_interval * 1000) > INT_MAX

1656

or retry_interval < 0){

1657

argp_error(state, "Bad retry interval");

1658

}

1659

break;

1660

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

1661

hookdir = arg;

1662

break;

1663

/*

1664

* These reproduce what we would get without ARGP_NO_HELP

1665

*/

1666

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

1667

argp_state_help(state, state->out_stream,

1668

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1669

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1670

case -3: /* --usage */

1671

argp_state_help(state, state->out_stream,

1672

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

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

1677

exit(argp_err_exit_status);

1104

1678

break;

1105

1679

default:

1106

1680

return ARGP_ERR_UNKNOWN;

1107

1681

}

1108

return 0;

1682

return errno;

1109

1683

}

1110

1684

1111

1685

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

1112

1686

.args_doc = "",

1113

1687

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

1114

1688

" 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

}

1689

ret = argp_parse(&argp, argc, argv,

1690

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1691

switch(ret){

1692

case 0:

1693

break;

1694

case ENOMEM:

1695

default:

1696

errno = ret;

1697

perror_plus("argp_parse");

1698

exitcode = EX_OSERR;

1699

goto end;

1700

case EINVAL:

1701

exitcode = EX_USAGE;

1702

goto end;

1703

}

1704

}

1705

1706

{

1707

/* Work around Debian bug #633582:

1708

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

1709

1710

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

1715

} else {

1716

struct stat st;

1717

1718

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

1719

int seckey_fd = open(seckey, O_RDONLY);

1720

if(seckey_fd == -1){

1721

perror_plus("open");

1722

} else {

1723

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

1724

if(ret == -1){

1725

perror_plus("fstat");

1726

} else {

1727

if(S_ISREG(st.st_mode)

1728

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

1729

ret = fchown(seckey_fd, uid, gid);

1730

if(ret == -1){

1731

perror_plus("fchown");

1732

}

1733

}

1734

}

1735

TEMP_FAILURE_RETRY(close(seckey_fd));

1736

}

1737

}

1738

1739

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

1740

int pubkey_fd = open(pubkey, O_RDONLY);

1741

if(pubkey_fd == -1){

1742

perror_plus("open");

1743

} else {

1744

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

1745

if(ret == -1){

1746

perror_plus("fstat");

1747

} else {

1748

if(S_ISREG(st.st_mode)

1749

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

1750

ret = fchown(pubkey_fd, uid, gid);

1751

if(ret == -1){

1752

perror_plus("fchown");

1753

}

1754

}

1755

}

1756

TEMP_FAILURE_RETRY(close(pubkey_fd));

1757

}

1758

}

1759

1760

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

1765

}

1766

}

1767

}

1768

1769

/* Run network hooks */

1770

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

1771

goto end;

1121

1772

}

1122

1773

1123

1774

if(not debug){

1124

1775

avahi_set_log_function(empty_log);

1125

1776

}

1126

1777

1778

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

1779

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

if(ret >= 1){

1790

/* Pick the first interface returned */

1791

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

1792

if(debug){

1793

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

1794

}

1795

if(interface == NULL){

1796

perror_plus("malloc");

1797

free(direntries);

1798

exitcode = EXIT_FAILURE;

1799

goto end;

1800

}

1801

free(direntries);

1802

} else {

1803

free(direntries);

1804

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

1805

exitcode = EXIT_FAILURE;

1806

goto end;

1807

}

1808

}

1809

1127

1810

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

1128

1811

from the signal handler */

1129

1812

/* Initialize the pseudo-RNG for Avahi */

1130

1813

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

1131

1814

mc.simple_poll = avahi_simple_poll_new();

1132

1815

if(mc.simple_poll == NULL){

1133

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

1134

exitcode = EXIT_FAILURE;

1816

fprintf_plus(stderr,

1817

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

1818

exitcode = EX_UNAVAILABLE;

1135

1819

goto end;

1136

1820

}

1137

1821

1138

1822

sigemptyset(&sigterm_action.sa_mask);

1139

1823

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

1140

1824

if(ret == -1){

1141

perror("sigaddset");

1142

exitcode = EXIT_FAILURE;

1825

perror_plus("sigaddset");

1826

exitcode = EX_OSERR;

1143

1827

goto end;

1144

1828

}

1145

1829

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

1146

1830

if(ret == -1){

1147

perror("sigaddset");

1148

exitcode = EXIT_FAILURE;

1831

perror_plus("sigaddset");

1832

exitcode = EX_OSERR;

1149

1833

goto end;

1150

1834

}

1151

1835

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

1152

1836

if(ret == -1){

1153

perror("sigaddset");

1154

exitcode = EXIT_FAILURE;

1837

perror_plus("sigaddset");

1838

exitcode = EX_OSERR;

1155

1839

goto end;

1156

1840

}

1157

1841

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

1160

1844

*/

1161

1845

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

1162

1846

if(ret == -1){

1163

perror("sigaction");

1164

return EXIT_FAILURE;

1847

perror_plus("sigaction");

1848

return EX_OSERR;

1165

1849

}

1166

1850

if(old_sigterm_action.sa_handler != SIG_IGN){

1167

1851

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

1168

1852

if(ret == -1){

1169

perror("sigaction");

1170

exitcode = EXIT_FAILURE;

1853

perror_plus("sigaction");

1854

exitcode = EX_OSERR;

1171

1855

goto end;

1172

1856

}

1173

1857

}

1174

1858

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

1175

1859

if(ret == -1){

1176

perror("sigaction");

1177

return EXIT_FAILURE;

1860

perror_plus("sigaction");

1861

return EX_OSERR;

1178

1862

}

1179

1863

if(old_sigterm_action.sa_handler != SIG_IGN){

1180

1864

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

1181

1865

if(ret == -1){

1182

perror("sigaction");

1183

exitcode = EXIT_FAILURE;

1866

perror_plus("sigaction");

1867

exitcode = EX_OSERR;

1184

1868

goto end;

1185

1869

}

1186

1870

}

1187

1871

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

1188

1872

if(ret == -1){

1189

perror("sigaction");

1190

return EXIT_FAILURE;

1873

perror_plus("sigaction");

1874

return EX_OSERR;

1191

1875

}

1192

1876

if(old_sigterm_action.sa_handler != SIG_IGN){

1193

1877

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

1194

1878

if(ret == -1){

1195

perror("sigaction");

1196

exitcode = EXIT_FAILURE;

1879

perror_plus("sigaction");

1880

exitcode = EX_OSERR;

1197

1881

goto end;

1198

1882

}

1199

1883

}

1200

1884

1201

1885

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

1202

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

1886

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

1203

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1204

1888

if(if_index == 0){

1205

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

1206

exitcode = EXIT_FAILURE;

1889

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

1890

exitcode = EX_UNAVAILABLE;

1207

1891

goto end;

1208

1892

}

1209

1893

1215

1899

errno = 0;

1216

1900

ret = seteuid(0);

1217

1901

if(ret == -1){

1218

perror("seteuid");

1902

perror_plus("seteuid");

1219

1903

}

1220

1904

1221

1905

#ifdef __linux__

1222

1906

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1223

messages to mess up the prompt */

1907

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

1224

1908

ret = klogctl(8, NULL, 5);

1225

1909

bool restore_loglevel = true;

1226

1910

if(ret == -1){

1227

1911

restore_loglevel = false;

1228

perror("klogctl");

1912

perror_plus("klogctl");

1229

1913

}

1230

1914

#endif /* __linux__ */

1231

1915

1232

1916

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1233

1917

if(sd < 0){

1234

perror("socket");

1235

exitcode = EXIT_FAILURE;

1918

perror_plus("socket");

1919

exitcode = EX_OSERR;

1236

1920

#ifdef __linux__

1237

1921

if(restore_loglevel){

1238

1922

ret = klogctl(7, NULL, 0);

1239

1923

if(ret == -1){

1240

perror("klogctl");

1924

perror_plus("klogctl");

1241

1925

}

1242

1926

}

1243

1927

#endif /* __linux__ */

1245

1929

errno = 0;

1246

1930

ret = seteuid(uid);

1247

1931

if(ret == -1){

1248

perror("seteuid");

1932

perror_plus("seteuid");

1249

1933

}

1250

1934

goto end;

1251

1935

}

1252

1936

strcpy(network.ifr_name, interface);

1253

1937

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

1254

1938

if(ret == -1){

1255

perror("ioctl SIOCGIFFLAGS");

1939

perror_plus("ioctl SIOCGIFFLAGS");

1256

1940

#ifdef __linux__

1257

1941

if(restore_loglevel){

1258

1942

ret = klogctl(7, NULL, 0);

1259

1943

if(ret == -1){

1260

perror("klogctl");

1944

perror_plus("klogctl");

1261

1945

}

1262

1946

}

1263

1947

#endif /* __linux__ */

1264

exitcode = EXIT_FAILURE;

1948

exitcode = EX_OSERR;

1265

1949

/* Lower privileges */

1266

1950

errno = 0;

1267

1951

ret = seteuid(uid);

1268

1952

if(ret == -1){

1269

perror("seteuid");

1953

perror_plus("seteuid");

1270

1954

}

1271

1955

goto end;

1272

1956

}

1276

1960

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

1277

1961

if(ret == -1){

1278

1962

take_down_interface = false;

1279

perror("ioctl SIOCSIFFLAGS");

1280

exitcode = EXIT_FAILURE;

1963

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1964

exitcode = EX_OSERR;

1281

1965

#ifdef __linux__

1282

1966

if(restore_loglevel){

1283

1967

ret = klogctl(7, NULL, 0);

1284

1968

if(ret == -1){

1285

perror("klogctl");

1969

perror_plus("klogctl");

1286

1970

}

1287

1971

}

1288

1972

#endif /* __linux__ */

1290

1974

errno = 0;

1291

1975

ret = seteuid(uid);

1292

1976

if(ret == -1){

1293

perror("seteuid");

1977

perror_plus("seteuid");

1294

1978

}

1295

1979

goto end;

1296

1980

}

1297

1981

}

1298

/* sleep checking until interface is running */

1982

/* Sleep checking until interface is running.

1983

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

1299

1984

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

1300

1985

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

1301

1986

if(ret == -1){

1302

perror("ioctl SIOCGIFFLAGS");

1987

perror_plus("ioctl SIOCGIFFLAGS");

1303

1988

} else if(network.ifr_flags & IFF_RUNNING){

1304

1989

break;

1305

1990

}

1306

1991

struct timespec sleeptime = { .tv_nsec = 250000000 };

1307

1992

ret = nanosleep(&sleeptime, NULL);

1308

1993

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

1309

perror("nanosleep");

1994

perror_plus("nanosleep");

1310

1995

}

1311

1996

}

1312

1997

if(not take_down_interface){

1313

1998

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

1314

1999

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

1315

2000

if(ret == -1){

1316

perror("close");

2001

perror_plus("close");

1317

2002

}

1318

2003

}

1319

2004

#ifdef __linux__

1321

2006

/* Restores kernel loglevel to default */

1322

2007

ret = klogctl(7, NULL, 0);

1323

2008

if(ret == -1){

1324

perror("klogctl");

2009

perror_plus("klogctl");

1325

2010

}

1326

2011

}

1327

2012

#endif /* __linux__ */

1328

2013

/* Lower privileges */

1329

2014

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

}

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

1342

2019

}

1343

2020

}

1344

2021

1348

2025

1349

2026

ret = init_gnutls_global(pubkey, seckey);

1350

2027

if(ret == -1){

1351

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

1352

exitcode = EXIT_FAILURE;

2028

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

2029

exitcode = EX_UNAVAILABLE;

1353

2030

goto end;

1354

2031

} else {

1355

2032

gnutls_initialized = true;

1359

2036

goto end;

1360

2037

}

1361

2038

2039

if(mkdtemp(tempdir) == NULL){

2040

perror_plus("mkdtemp");

2041

goto end;

2042

}

1362

2043

tempdir_created = true;

1363

if(mkdtemp(tempdir) == NULL){

1364

tempdir_created = false;

1365

perror("mkdtemp");

1366

goto end;

1367

}

1368

2044

1369

2045

if(quit_now){

1370

2046

goto end;

1371

2047

}

1372

2048

1373

2049

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

1374

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

1375

exitcode = EXIT_FAILURE;

2050

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

2051

exitcode = EX_UNAVAILABLE;

1376

2052

goto end;

1377

2053

} else {

1378

2054

gpgme_initialized = true;

1387

2063

/* (Mainly meant for debugging) */

1388

2064

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

1389

2065

if(address == NULL){

1390

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

1391

exitcode = EXIT_FAILURE;

2066

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

2067

exitcode = EX_USAGE;

1392

2068

goto end;

1393

2069

}

1394

2070

1401

2077

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

1402

2078

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

1403

2079

or tmpmax != (uint16_t)tmpmax){

1404

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

1405

exitcode = EXIT_FAILURE;

2080

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

2081

exitcode = EX_USAGE;

1406

2082

goto end;

1407

2083

}

1408

2084

1412

2088

1413

2089

port = (uint16_t)tmpmax;

1414

2090

*address = '\0';

1415

address = connect_to;

1416

2091

/* Colon in address indicates IPv6 */

1417

2092

int af;

1418

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

2093

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

1419

2094

af = AF_INET6;

2095

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

2096

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

2097

{

2098

connect_to++;

2099

address[-1] = '\0';

2100

}

1420

2101

} else {

1421

2102

af = AF_INET;

1422

2103

}

2104

address = connect_to;

1423

2105

1424

2106

if(quit_now){

1425

2107

goto end;

1426

2108

}

1427

2109

1428

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

1429

if(ret < 0){

1430

exitcode = EXIT_FAILURE;

1431

} else {

2110

while(not quit_now){

2111

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

2112

if(quit_now or ret == 0){

2113

break;

2114

}

2115

if(debug){

2116

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

2117

(int)retry_interval);

2118

}

2119

sleep((int)retry_interval);

2120

}

2121

2122

if (not quit_now){

1432

2123

exitcode = EXIT_SUCCESS;

1433

2124

}

2125

1434

2126

goto end;

1435

2127

}

1436

2128

1458

2150

1459

2151

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

1460

2152

if(mc.server == NULL){

1461

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

1462

avahi_strerror(error));

1463

exitcode = EXIT_FAILURE;

2153

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

2154

avahi_strerror(error));

2155

exitcode = EX_UNAVAILABLE;

1464

2156

goto end;

1465

2157

}

1466

2158

1473

2165

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1474

2166

NULL, 0, browse_callback, NULL);

1475

2167

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;

2168

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

2169

avahi_strerror(avahi_server_errno(mc.server)));

2170

exitcode = EX_UNAVAILABLE;

1479

2171

goto end;

1480

2172

}

1481

2173

1486

2178

/* Run the main loop */

1487

2179

1488

2180

if(debug){

1489

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

1490

}

1491

1492

avahi_simple_poll_loop(mc.simple_poll);

2181

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

2182

}

2183

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2186

if(debug){

2187

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

2188

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

2189

}

1493

2190

1494

2191

end:

1495

2192

1496

2193

if(debug){

1497

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

2194

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

1498

2195

}

1499

2196

1500

2197

/* Cleanup things */

1517

2214

gpgme_release(mc.ctx);

1518

2215

}

1519

2216

1520

/* Take down the network interface */

1521

if(take_down_interface){

1522

/* Re-raise priviliges */

2217

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

2218

has seen */

2219

if(mc.current_server != NULL){

2220

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

2221

while(mc.current_server != NULL){

2222

server *next = mc.current_server->next;

2223

free(mc.current_server);

2224

mc.current_server = next;

2225

}

2226

}

2227

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

2232

{

1523

2233

errno = 0;

1524

2234

ret = seteuid(0);

1525

2235

if(ret == -1){

1526

perror("seteuid");

2236

perror_plus("seteuid");

1527

2237

}

1528

if(geteuid() == 0){

2238

2239

/* Take down the network interface */

2240

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

1529

2241

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

1530

2242

if(ret == -1){

1531

perror("ioctl SIOCGIFFLAGS");

1532

} else if(network.ifr_flags & IFF_UP) {

1533

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

2243

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

2245

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

1534

2246

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

1535

2247

if(ret == -1){

1536

perror("ioctl SIOCSIFFLAGS");

2248

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1537

2249

}

1538

2250

}

1539

2251

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

1540

2252

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");

2253

perror_plus("close");

1548

2254

}

1549

2255

}

1550

2256

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

1551

2263

1552

/* Removes the temp directory used by GPGME */

2264

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

1553

2265

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

}

2266

struct dirent **direntries = NULL;

2267

struct dirent *direntry = NULL;

2268

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

2269

alphasort);

2270

if (numentries > 0){

2271

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

2272

direntry = direntries[i];

1574

2273

char *fullname = NULL;

1575

2274

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

1576

2275

direntry->d_name);

1577

2276

if(ret < 0){

1578

perror("asprintf");

2277

perror_plus("asprintf");

1579

2278

continue;

1580

2279

}

1581

2280

ret = remove(fullname);

1582

2281

if(ret == -1){

1583

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

1584

strerror(errno));

2282

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

2283

strerror(errno));

1585

2284

}

1586

2285

free(fullname);

1587

2286

}

1588

closedir(d);

2287

}

2288

2289

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

2290

free(direntries);

2291

if (numentries == -1){

2292

perror_plus("scandir");

1589

2293

}

1590

2294

ret = rmdir(tempdir);

1591

2295

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

1592

perror("rmdir");

2296

perror_plus("rmdir");

1593

2297

}

1594

2298

}

1595

2299

1600

2304

&old_sigterm_action,

1601

2305

NULL));

1602

2306

if(ret == -1){

1603

perror("sigaction");

2307

perror_plus("sigaction");

1604

2308

}

1605

2309

do {

1606

2310

ret = raise(signal_received);

1607

2311

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

1608

2312

if(ret != 0){

1609

perror("raise");

2313

perror_plus("raise");

1610

2314

abort();

1611

2315

}

1612

2316

TEMP_FAILURE_RETRY(pause());