/mandos/trunk : revision 422

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

10

*

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* Everything else is

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13

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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32

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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*/

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

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

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

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

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setgid(), pause() */

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

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

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78

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

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argp_state, struct argp,

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84

raise() */

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85

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

87

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

90

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

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87

92

88

#ifdef __linux__

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89

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

111

107

init_gnutls_session(),

112

108

GNUTLS_* */

113

109

#include <gnutls/openpgp.h>

114

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

110

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

116

112

117

113

/* GPGME */

118

114

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

126

122

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

127

123

#define SECKEY "seckey.txt"

128

124

#define PUBKEY "pubkey.txt"

129

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

130

125

131

126

bool debug = false;

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127

static const char mandos_protocol_version[] = "1";

133

128

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

134

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

129

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

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130

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

136

131

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

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139

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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struct server *next;

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struct server *prev;

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} server;

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132

150

133

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

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134

typedef struct {

156

139

gnutls_dh_params_t dh_params;

157

140

const char *priority;

158

141

gpgme_ctx_t ctx;

159

server *current_server;

160

142

} mandos_context;

161

143

162

144

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

163

145

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

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146

.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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

167

148

168

149

sig_atomic_t quit_now = 0;

169

150

int signal_received = 0;

170

151

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

190

152

/*

191

153

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

192

154

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

193

155

* "buffer_length" is how much is already used.

194

156

*/

195

157

size_t incbuffer(char **buffer, size_t buffer_length,

196

size_t buffer_capacity){

158

size_t buffer_capacity){

197

159

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

160

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

199

161

if(buffer == NULL){

204

166

return buffer_capacity;

205

167

}

206

168

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

244

169

/*

245

170

* Initialize GPGME.

246

171

*/

247

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

248

const char *tempdir){

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

249

174

gpgme_error_t rc;

250

175

gpgme_engine_info_t engine_info;

251

176

260

185

261

186

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

262

187

if(fd == -1){

263

perror_plus("open");

188

perror("open");

264

189

return false;

265

190

}

266

191

267

192

rc = gpgme_data_new_from_fd(&pgp_data, fd);

268

193

if(rc != GPG_ERR_NO_ERROR){

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

194

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

195

gpgme_strsource(rc), gpgme_strerror(rc));

271

196

return false;

272

197

}

273

198

274

199

rc = gpgme_op_import(mc.ctx, pgp_data);

275

200

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

278

203

return false;

279

204

}

280

205

281

206

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

282

207

if(ret == -1){

283

perror_plus("close");

208

perror("close");

284

209

}

285

210

gpgme_data_release(pgp_data);

286

211

return true;

287

212

}

288

213

289

214

if(debug){

290

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

215

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

291

216

}

292

217

293

218

/* Init GPGME */

294

219

gpgme_check_version(NULL);

295

220

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

296

221

if(rc != GPG_ERR_NO_ERROR){

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

222

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

223

gpgme_strsource(rc), gpgme_strerror(rc));

299

224

return false;

300

225

}

301

226

302

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

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

303

228

rc = gpgme_get_engine_info(&engine_info);

304

229

if(rc != GPG_ERR_NO_ERROR){

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

230

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

231

gpgme_strsource(rc), gpgme_strerror(rc));

307

232

return false;

308

233

}

309

234

while(engine_info != NULL){

315

240

engine_info = engine_info->next;

316

241

}

317

242

if(engine_info == NULL){

318

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

319

tempdir);

243

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

320

244

return false;

321

245

}

322

246

323

247

/* Create new GPGME "context" */

324

248

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

325

249

if(rc != GPG_ERR_NO_ERROR){

326

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

327

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

328

gpgme_strerror(rc));

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

329

252

return false;

330

253

}

331

254

350

273

ssize_t plaintext_length = 0;

351

274

352

275

if(debug){

353

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

276

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

354

277

}

355

278

356

279

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

357

280

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

358

281

0);

359

282

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

362

285

return -1;

363

286

}

364

287

365

288

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

366

289

rc = gpgme_data_new(&dh_plain);

367

290

if(rc != GPG_ERR_NO_ERROR){

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

371

293

gpgme_data_release(dh_crypto);

372

294

return -1;

373

295

}

376

298

data buffer */

377

299

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

378

300

if(rc != GPG_ERR_NO_ERROR){

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

381

303

plaintext_length = -1;

382

304

if(debug){

383

305

gpgme_decrypt_result_t result;

384

306

result = gpgme_op_decrypt_result(mc.ctx);

385

307

if(result == NULL){

386

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

308

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

387

309

} else {

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

392

314

if(result->file_name != NULL){

393

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

315

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

394

316

}

395

317

gpgme_recipient_t recipient;

396

318

recipient = result->recipients;

397

319

while(recipient != NULL){

398

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

399

gpgme_pubkey_algo_name

400

(recipient->pubkey_algo));

401

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

402

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

403

recipient->status == GPG_ERR_NO_SECKEY

404

? "No" : "Yes");

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

405

326

recipient = recipient->next;

406

327

}

407

328

}

410

331

}

411

332

412

333

if(debug){

413

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

334

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

414

335

}

415

336

416

337

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

417

338

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

418

perror_plus("gpgme_data_seek");

339

perror("gpgme_data_seek");

419

340

plaintext_length = -1;

420

341

goto decrypt_end;

421

342

}

423

344

*plaintext = NULL;

424

345

while(true){

425

346

plaintext_capacity = incbuffer(plaintext,

426

(size_t)plaintext_length,

427

plaintext_capacity);

347

(size_t)plaintext_length,

348

plaintext_capacity);

428

349

if(plaintext_capacity == 0){

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

432

353

}

433

354

434

355

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

439

360

break;

440

361

}

441

362

if(ret < 0){

442

perror_plus("gpgme_data_read");

363

perror("gpgme_data_read");

443

364

plaintext_length = -1;

444

365

goto decrypt_end;

445

366

}

447

368

}

448

369

449

370

if(debug){

450

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

371

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

451

372

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

452

373

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

453

374

}

475

396

/* GnuTLS log function callback */

476

397

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

477

398

const char* string){

478

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

399

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

479

400

}

480

401

481

402

static int init_gnutls_global(const char *pubkeyfilename,

483

404

int ret;

484

405

485

406

if(debug){

486

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

407

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

487

408

}

488

409

489

410

ret = gnutls_global_init();

490

411

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

412

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

413

safer_gnutls_strerror(ret));

493

414

return -1;

494

415

}

495

416

502

423

}

503

424

504

425

/* OpenPGP credentials */

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

506

427

if(ret != GNUTLS_E_SUCCESS){

507

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

508

safer_gnutls_strerror(ret));

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

509

433

gnutls_global_deinit();

510

434

return -1;

511

435

}

512

436

513

437

if(debug){

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

438

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

439

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

440

seckeyfilename);

518

441

}

519

442

520

443

ret = gnutls_certificate_set_openpgp_key_file

521

444

(mc.cred, pubkeyfilename, seckeyfilename,

522

445

GNUTLS_OPENPGP_FMT_BASE64);

523

446

if(ret != GNUTLS_E_SUCCESS){

524

fprintf_plus(stderr,

525

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

526

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

527

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

528

safer_gnutls_strerror(ret));

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

529

452

goto globalfail;

530

453

}

531

454

532

455

/* GnuTLS server initialization */

533

456

ret = gnutls_dh_params_init(&mc.dh_params);

534

457

if(ret != GNUTLS_E_SUCCESS){

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

458

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

459

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

538

460

goto globalfail;

539

461

}

540

462

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

541

463

if(ret != GNUTLS_E_SUCCESS){

542

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

543

safer_gnutls_strerror(ret));

464

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

465

safer_gnutls_strerror(ret));

544

466

goto globalfail;

545

467

}

546

468

566

488

}

567

489

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

568

490

if(ret != GNUTLS_E_SUCCESS){

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

572

493

}

573

494

574

495

{

581

502

}

582

503

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

583

504

if(ret != GNUTLS_E_SUCCESS){

584

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

585

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

586

safer_gnutls_strerror(ret));

505

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

506

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

507

safer_gnutls_strerror(ret));

587

508

gnutls_deinit(*session);

588

509

return -1;

589

510

}

598

519

}

599

520

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

600

521

if(ret != GNUTLS_E_SUCCESS){

601

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

602

safer_gnutls_strerror(ret));

522

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

523

safer_gnutls_strerror(ret));

603

524

gnutls_deinit(*session);

604

525

return -1;

605

526

}

650

571

pf = PF_INET;

651

572

break;

652

573

default:

653

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

574

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

654

575

errno = EINVAL;

655

576

return -1;

656

577

}

661

582

}

662

583

663

584

if(debug){

664

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

665

PRIu16 "\n", ip, port);

585

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

586

"\n", ip, port);

666

587

}

667

588

668

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

669

590

if(tcp_sd < 0){

670

591

int e = errno;

671

perror_plus("socket");

592

perror("socket");

672

593

errno = e;

673

594

goto mandos_end;

674

595

}

688

609

}

689

610

if(ret < 0 ){

690

611

int e = errno;

691

perror_plus("inet_pton");

612

perror("inet_pton");

692

613

errno = e;

693

614

goto mandos_end;

694

615

}

695

616

if(ret == 0){

696

617

int e = errno;

697

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

618

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

698

619

errno = e;

699

620

goto mandos_end;

700

621

}

705

626

706

627

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

628

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

708

-Wunreachable-code*/

629

-Wunreachable-code*/

709

630

if(if_index == AVAHI_IF_UNSPEC){

710

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

711

" incomplete without a network interface\n");

631

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

632

" without a network interface\n");

712

633

errno = EINVAL;

713

634

goto mandos_end;

714

635

}

730

651

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

731

652

char interface[IF_NAMESIZE];

732

653

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

733

perror_plus("if_indextoname");

654

perror("if_indextoname");

734

655

} else {

735

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

736

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

656

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

657

ip, interface, port);

737

658

}

738

659

} else {

739

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

740

ip, port);

660

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

661

port);

741

662

}

742

663

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

664

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

671

sizeof(addrstr));

751

672

}

752

673

if(pcret == NULL){

753

perror_plus("inet_ntop");

674

perror("inet_ntop");

754

675

} else {

755

676

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

756

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

677

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

757

678

}

758

679

}

759

680

}

769

690

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

770

691

}

771

692

if(ret < 0){

772

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

773

int e = errno;

774

perror_plus("connect");

775

errno = e;

776

}

693

int e = errno;

694

perror("connect");

695

errno = e;

777

696

goto mandos_end;

778

697

}

779

698

787

706

while(true){

788

707

size_t out_size = strlen(out);

789

708

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

790

out_size - written));

709

out_size - written));

791

710

if(ret == -1){

792

711

int e = errno;

793

perror_plus("write");

712

perror("write");

794

713

errno = e;

795

714

goto mandos_end;

796

715

}

813

732

}

814

733

815

734

if(debug){

816

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

735

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

817

736

}

818

737

819

738

if(quit_now){

821

740

goto mandos_end;

822

741

}

823

742

824

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

825

743

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

826

744

827

745

if(quit_now){

839

757

840

758

if(ret != GNUTLS_E_SUCCESS){

841

759

if(debug){

842

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

760

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

843

761

gnutls_perror(ret);

844

762

}

845

763

errno = EPROTO;

849

767

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

850

768

851

769

if(debug){

852

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

853

" %s\n", ip);

770

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

771

ip);

854

772

}

855

773

856

774

while(true){

861

779

}

862

780

863

781

buffer_capacity = incbuffer(&buffer, buffer_length,

864

buffer_capacity);

782

buffer_capacity);

865

783

if(buffer_capacity == 0){

866

784

int e = errno;

867

perror_plus("incbuffer");

785

perror("incbuffer");

868

786

errno = e;

869

787

goto mandos_end;

870

788

}

894

812

}

895

813

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

896

814

if(ret < 0){

897

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

898

"***\n");

815

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

899

816

gnutls_perror(ret);

900

817

errno = EPROTO;

901

818

goto mandos_end;

902

819

}

903

820

break;

904

821

default:

905

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

906

" encrypted session with Mandos server\n");

822

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

823

" encrypted session with Mandos server\n");

907

824

gnutls_bye(session, GNUTLS_SHUT_RDWR);

908

825

errno = EIO;

909

826

goto mandos_end;

914

831

}

915

832

916

833

if(debug){

917

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

834

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

918

835

}

919

836

920

837

if(quit_now){

932

849

933

850

if(buffer_length > 0){

934

851

ssize_t decrypted_buffer_size;

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

852

decrypted_buffer_size = pgp_packet_decrypt(buffer,

853

buffer_length,

936

854

&decrypted_buffer);

937

855

if(decrypted_buffer_size >= 0){

938

856

949

867

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

950

868

int e = errno;

951

869

if(debug){

952

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

953

strerror(errno));

870

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

871

strerror(errno));

954

872

}

955

873

errno = e;

956

874

goto mandos_end;

975

893

if(e == 0){

976

894

e = errno;

977

895

}

978

perror_plus("close");

896

perror("close");

979

897

}

980

898

gnutls_deinit(session);

981

errno = e;

982

899

if(quit_now){

983

errno = EINTR;

900

e = EINTR;

984

901

retval = -1;

985

902

}

903

errno = e;

986

904

}

987

905

return retval;

988

906

}

1013

931

switch(event){

1014

932

default:

1015

933

case AVAHI_RESOLVER_FAILURE:

1016

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

1017

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

1018

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

934

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

935

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

936

avahi_strerror(avahi_server_errno(mc.server)));

1020

937

break;

1021

938

1022

939

case AVAHI_RESOLVER_FOUND:

1024

941

char ip[AVAHI_ADDRESS_STR_MAX];

1025

942

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

1026

943

if(debug){

1027

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

1028

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

1029

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

944

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

945

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

946

ip, (intmax_t)interface, port);

1030

947

}

1031

948

int ret = start_mandos_communication(ip, port, interface,

1032

949

avahi_proto_to_af(proto));

1033

950

if(ret == 0){

1034

951

avahi_simple_poll_quit(mc.simple_poll);

1035

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1038

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

1039

" list\n", name);

1040

}

1041

952

}

1042

953

}

1043

954

}

1067

978

default:

1068

979

case AVAHI_BROWSER_FAILURE:

1069

980

1070

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

981

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

982

avahi_strerror(avahi_server_errno(mc.server)));

1072

983

avahi_simple_poll_quit(mc.simple_poll);

1073

984

return;

1074

985

1081

992

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

1082

993

name, type, domain, protocol, 0,

1083

994

resolve_callback, NULL) == NULL)

1084

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

1085

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

995

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

996

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

1087

997

break;

1088

998

1089

999

case AVAHI_BROWSER_REMOVE:

1092

1002

case AVAHI_BROWSER_ALL_FOR_NOW:

1093

1003

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1094

1004

if(debug){

1095

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

1096

" searching...\n");

1005

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

1097

1006

}

1098

1007

break;

1099

1008

}

1100

1009

}

1101

1010

1102

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

1011

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

1103

1012

static void handle_sigterm(int sig){

1104

1013

if(quit_now){

1105

1014

return;

1107

1016

quit_now = 1;

1108

1017

signal_received = sig;

1109

1018

int old_errno = errno;

1110

/* set main loop to exit */

1111

1019

if(mc.simple_poll != NULL){

1112

1020

avahi_simple_poll_quit(mc.simple_poll);

1113

1021

}

1114

1022

errno = old_errno;

1115

1023

}

1116

1024

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){

1025

/*

1026

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

1027

* corresponds to an acceptable network device.

1028

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

1029

*/

1030

int good_interface(const struct dirent *if_entry){

1031

ssize_t ssret;

1032

char *flagname = NULL;

1033

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1034

if_entry->d_name);

1035

if(ret < 0){

1036

perror("asprintf");

1037

return 0;

1038

}

1039

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

1040

return 0;

1041

}

1042

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1043

if(flags_fd == -1){

1044

perror("open");

1045

return 0;

1046

}

1047

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1048

/* read line from flags_fd */

1049

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1050

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1051

flagstring[(size_t)to_read] = '\0';

1052

if(flagstring == NULL){

1053

perror("malloc");

1054

close(flags_fd);

1055

return 0;

1056

}

1057

while(to_read > 0){

1058

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1059

(size_t)to_read));

1060

if(ssret == -1){

1061

perror("read");

1062

free(flagstring);

1063

close(flags_fd);

1064

return 0;

1065

}

1066

to_read -= ssret;

1067

if(ssret == 0){

1068

break;

1069

}

1070

}

1071

close(flags_fd);

1072

intmax_t tmpmax;

1073

char *tmp;

1074

errno = 0;

1075

tmpmax = strtoimax(flagstring, &tmp, 0);

1076

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

1077

and not (isspace(*tmp)))

1078

or tmpmax != (ifreq_flags)tmpmax){

1128

1079

if(debug){

1129

perror_plus("ioctl SIOCGIFFLAGS");

1080

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1081

flagstring, if_entry->d_name);

1130

1082

}

1131

return false;

1083

free(flagstring);

1084

return 0;

1132

1085

}

1133

return true;

1134

}

1135

1136

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

1137

1086

free(flagstring);

1087

ifreq_flags flags = (ifreq_flags)tmpmax;

1138

1088

/* Reject the loopback device */

1139

if(ifr->ifr_flags & IFF_LOOPBACK){

1089

if(flags & IFF_LOOPBACK){

1140

1090

if(debug){

1141

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

1142

ifname);

1091

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

1092

if_entry->d_name);

1143

1093

}

1144

return false;

1094

return 0;

1145

1095

}

1146

1096

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

1147

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

1097

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1148

1098

if(debug){

1149

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

1150

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

1099

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1100

if_entry->d_name);

1151

1101

}

1152

return true;

1102

return 1;

1153

1103

}

1154

1104

/* 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

1105

if(not (flags & IFF_BROADCAST)){

1106

if(debug){

1107

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1108

if_entry->d_name);

1109

}

1110

return 0;

1111

}

1171

1112

/* Accept this device */

1172

1113

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;

1114

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1115

if_entry->d_name);

1116

}

1117

return 1;

1524

1118

}

1525

1119

1526

1120

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

1545

1139

bool gnutls_initialized = false;

1546

1140

bool gpgme_initialized = false;

1547

1141

float delay = 2.5f;

1548

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

1549

retrying the same server again */

1550

1142

1551

1143

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1552

1144

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1558

1150

errno = 0;

1559

1151

ret = setgid(gid);

1560

1152

if(ret == -1){

1561

perror_plus("setgid");

1153

perror("setgid");

1562

1154

}

1563

1155

1564

1156

/* Lower user privileges (temporarily) */

1565

1157

errno = 0;

1566

1158

ret = seteuid(uid);

1567

1159

if(ret == -1){

1568

perror_plus("seteuid");

1160

perror("seteuid");

1569

1161

}

1570

1162

1571

1163

if(quit_now){

1606

1198

.arg = "SECONDS",

1607

1199

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

1608

1200

.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

1201

/*

1618

1202

* These reproduce what we would get without ARGP_NO_HELP

1619

1203

*/

1663

1247

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

1664

1248

argp_error(state, "Bad delay");

1665

1249

}

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

1250

break;

1678

1251

/*

1679

1252

* These reproduce what we would get without ARGP_NO_HELP

1686

1259

argp_state_help(state, state->out_stream,

1687

1260

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1688

1261

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

1689

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

1262

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

1690

1263

exit(argp_err_exit_status);

1691

1264

break;

1692

1265

default:

1707

1280

case ENOMEM:

1708

1281

default:

1709

1282

errno = ret;

1710

perror_plus("argp_parse");

1283

perror("argp_parse");

1711

1284

exitcode = EX_OSERR;

1712

1285

goto end;

1713

1286

case EINVAL:

1715

1288

goto end;

1716

1289

}

1717

1290

}

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;

1785

}

1786

1291

1787

1292

if(not debug){

1788

1293

avahi_set_log_function(empty_log);

1789

1294

}

1790

1295

1791

1296

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

1792

1297

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1298

ret = scandir(sys_class_net, &direntries, good_interface,

1795

1299

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

1300

if(ret >= 1){

1803

/* Pick the first interface returned */

1301

/* Pick the first good interface */

1804

1302

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

1805

1303

if(debug){

1806

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

1304

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

1807

1305

}

1808

1306

if(interface == NULL){

1809

perror_plus("malloc");

1307

perror("malloc");

1810

1308

free(direntries);

1811

1309

exitcode = EXIT_FAILURE;

1812

1310

goto end;

1814

1312

free(direntries);

1815

1313

} else {

1816

1314

free(direntries);

1817

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

1315

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

1818

1316

exitcode = EXIT_FAILURE;

1819

1317

goto end;

1820

1318

}

1826

1324

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

1827

1325

mc.simple_poll = avahi_simple_poll_new();

1828

1326

if(mc.simple_poll == NULL){

1829

fprintf_plus(stderr,

1830

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

1327

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

1831

1328

exitcode = EX_UNAVAILABLE;

1832

1329

goto end;

1833

1330

}

1835

1332

sigemptyset(&sigterm_action.sa_mask);

1836

1333

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

1837

1334

if(ret == -1){

1838

perror_plus("sigaddset");

1335

perror("sigaddset");

1839

1336

exitcode = EX_OSERR;

1840

1337

goto end;

1841

1338

}

1842

1339

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

1843

1340

if(ret == -1){

1844

perror_plus("sigaddset");

1341

perror("sigaddset");

1845

1342

exitcode = EX_OSERR;

1846

1343

goto end;

1847

1344

}

1848

1345

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

1849

1346

if(ret == -1){

1850

perror_plus("sigaddset");

1347

perror("sigaddset");

1851

1348

exitcode = EX_OSERR;

1852

1349

goto end;

1853

1350

}

1857

1354

*/

1858

1355

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

1859

1356

if(ret == -1){

1860

perror_plus("sigaction");

1357

perror("sigaction");

1861

1358

return EX_OSERR;

1862

1359

}

1863

1360

if(old_sigterm_action.sa_handler != SIG_IGN){

1864

1361

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

1865

1362

if(ret == -1){

1866

perror_plus("sigaction");

1363

perror("sigaction");

1867

1364

exitcode = EX_OSERR;

1868

1365

goto end;

1869

1366

}

1870

1367

}

1871

1368

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

1872

1369

if(ret == -1){

1873

perror_plus("sigaction");

1370

perror("sigaction");

1874

1371

return EX_OSERR;

1875

1372

}

1876

1373

if(old_sigterm_action.sa_handler != SIG_IGN){

1877

1374

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

1878

1375

if(ret == -1){

1879

perror_plus("sigaction");

1376

perror("sigaction");

1880

1377

exitcode = EX_OSERR;

1881

1378

goto end;

1882

1379

}

1883

1380

}

1884

1381

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

1885

1382

if(ret == -1){

1886

perror_plus("sigaction");

1383

perror("sigaction");

1887

1384

return EX_OSERR;

1888

1385

}

1889

1386

if(old_sigterm_action.sa_handler != SIG_IGN){

1890

1387

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

1891

1388

if(ret == -1){

1892

perror_plus("sigaction");

1389

perror("sigaction");

1893

1390

exitcode = EX_OSERR;

1894

1391

goto end;

1895

1392

}

1899

1396

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

1900

1397

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

1398

if(if_index == 0){

1902

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

1399

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

1903

1400

exitcode = EX_UNAVAILABLE;

1904

1401

goto end;

1905

1402

}

1912

1409

errno = 0;

1913

1410

ret = seteuid(0);

1914

1411

if(ret == -1){

1915

perror_plus("seteuid");

1412

perror("seteuid");

1916

1413

}

1917

1414

1918

1415

#ifdef __linux__

1922

1419

bool restore_loglevel = true;

1923

1420

if(ret == -1){

1924

1421

restore_loglevel = false;

1925

perror_plus("klogctl");

1422

perror("klogctl");

1926

1423

}

1927

1424

#endif /* __linux__ */

1928

1425

1929

1426

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1930

1427

if(sd < 0){

1931

perror_plus("socket");

1428

perror("socket");

1932

1429

exitcode = EX_OSERR;

1933

1430

#ifdef __linux__

1934

1431

if(restore_loglevel){

1935

1432

ret = klogctl(7, NULL, 0);

1936

1433

if(ret == -1){

1937

perror_plus("klogctl");

1434

perror("klogctl");

1938

1435

}

1939

1436

}

1940

1437

#endif /* __linux__ */

1942

1439

errno = 0;

1943

1440

ret = seteuid(uid);

1944

1441

if(ret == -1){

1945

perror_plus("seteuid");

1442

perror("seteuid");

1946

1443

}

1947

1444

goto end;

1948

1445

}

1949

1446

strcpy(network.ifr_name, interface);

1950

1447

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

1951

1448

if(ret == -1){

1952

perror_plus("ioctl SIOCGIFFLAGS");

1449

perror("ioctl SIOCGIFFLAGS");

1953

1450

#ifdef __linux__

1954

1451

if(restore_loglevel){

1955

1452

ret = klogctl(7, NULL, 0);

1956

1453

if(ret == -1){

1957

perror_plus("klogctl");

1454

perror("klogctl");

1958

1455

}

1959

1456

}

1960

1457

#endif /* __linux__ */

1963

1460

errno = 0;

1964

1461

ret = seteuid(uid);

1965

1462

if(ret == -1){

1966

perror_plus("seteuid");

1463

perror("seteuid");

1967

1464

}

1968

1465

goto end;

1969

1466

}

1973

1470

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

1974

1471

if(ret == -1){

1975

1472

take_down_interface = false;

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1473

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1977

1474

exitcode = EX_OSERR;

1978

1475

#ifdef __linux__

1979

1476

if(restore_loglevel){

1980

1477

ret = klogctl(7, NULL, 0);

1981

1478

if(ret == -1){

1982

perror_plus("klogctl");

1479

perror("klogctl");

1983

1480

}

1984

1481

}

1985

1482

#endif /* __linux__ */

1987

1484

errno = 0;

1988

1485

ret = seteuid(uid);

1989

1486

if(ret == -1){

1990

perror_plus("seteuid");

1487

perror("seteuid");

1991

1488

}

1992

1489

goto end;

1993

1490

}

1994

1491

}

1995

/* Sleep checking until interface is running.

1996

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

1492

/* sleep checking until interface is running */

1997

1493

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

1998

1494

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

1999

1495

if(ret == -1){

2000

perror_plus("ioctl SIOCGIFFLAGS");

1496

perror("ioctl SIOCGIFFLAGS");

2001

1497

} else if(network.ifr_flags & IFF_RUNNING){

2002

1498

break;

2003

1499

}

2004

1500

struct timespec sleeptime = { .tv_nsec = 250000000 };

2005

1501

ret = nanosleep(&sleeptime, NULL);

2006

1502

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

2007

perror_plus("nanosleep");

1503

perror("nanosleep");

2008

1504

}

2009

1505

}

2010

1506

if(not take_down_interface){

2011

1507

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

2012

1508

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

2013

1509

if(ret == -1){

2014

perror_plus("close");

1510

perror("close");

2015

1511

}

2016

1512

}

2017

1513

#ifdef __linux__

2019

1515

/* Restores kernel loglevel to default */

2020

1516

ret = klogctl(7, NULL, 0);

2021

1517

if(ret == -1){

2022

perror_plus("klogctl");

1518

perror("klogctl");

2023

1519

}

2024

1520

}

2025

1521

#endif /* __linux__ */

2026

1522

/* Lower privileges */

2027

1523

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

1524

if(take_down_interface){

1525

/* Lower privileges */

1526

ret = seteuid(uid);

1527

if(ret == -1){

1528

perror("seteuid");

1529

}

1530

} else {

1531

/* Lower privileges permanently */

1532

ret = setuid(uid);

1533

if(ret == -1){

1534

perror("setuid");

1535

}

2032

1536

}

2033

1537

}

2034

1538

2038

1542

2039

1543

ret = init_gnutls_global(pubkey, seckey);

2040

1544

if(ret == -1){

2041

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

1545

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

2042

1546

exitcode = EX_UNAVAILABLE;

2043

1547

goto end;

2044

1548

} else {

2049

1553

goto end;

2050

1554

}

2051

1555

1556

tempdir_created = true;

2052

1557

if(mkdtemp(tempdir) == NULL){

2053

perror_plus("mkdtemp");

1558

tempdir_created = false;

1559

perror("mkdtemp");

2054

1560

goto end;

2055

1561

}

2056

tempdir_created = true;

2057

1562

2058

1563

if(quit_now){

2059

1564

goto end;

2060

1565

}

2061

1566

2062

1567

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

2063

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

1568

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

2064

1569

exitcode = EX_UNAVAILABLE;

2065

1570

goto end;

2066

1571

} else {

2076

1581

/* (Mainly meant for debugging) */

2077

1582

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

2078

1583

if(address == NULL){

2079

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

1584

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

2080

1585

exitcode = EX_USAGE;

2081

1586

goto end;

2082

1587

}

2090

1595

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

2091

1596

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

2092

1597

or tmpmax != (uint16_t)tmpmax){

2093

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

1598

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

2094

1599

exitcode = EX_USAGE;

2095

1600

goto end;

2096

1601

}

2101

1606

2102

1607

port = (uint16_t)tmpmax;

2103

1608

*address = '\0';

1609

address = connect_to;

2104

1610

/* Colon in address indicates IPv6 */

2105

1611

int af;

2106

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

1612

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

2107

1613

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

}

2114

1614

} else {

2115

1615

af = AF_INET;

2116

1616

}

2117

address = connect_to;

2118

1617

2119

1618

if(quit_now){

2120

1619

goto end;

2121

1620

}

2122

1621

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){

1622

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

1623

if(ret < 0){

1624

switch(errno){

1625

case ENETUNREACH:

1626

case EHOSTDOWN:

1627

case EHOSTUNREACH:

1628

exitcode = EX_NOHOST;

1629

break;

1630

case EINVAL:

1631

exitcode = EX_USAGE;

1632

break;

1633

case EIO:

1634

exitcode = EX_IOERR;

1635

break;

1636

case EPROTO:

1637

exitcode = EX_PROTOCOL;

1638

break;

1639

default:

1640

exitcode = EX_OSERR;

1641

break;

1642

}

1643

} else {

2136

1644

exitcode = EXIT_SUCCESS;

2137

1645

}

2138

2139

1646

goto end;

2140

1647

}

2141

1648

2163

1670

2164

1671

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

2165

1672

if(mc.server == NULL){

2166

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

2167

avahi_strerror(error));

1673

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

1674

avahi_strerror(error));

2168

1675

exitcode = EX_UNAVAILABLE;

2169

1676

goto end;

2170

1677

}

2178

1685

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2179

1686

NULL, 0, browse_callback, NULL);

2180

1687

if(sb == NULL){

2181

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

2182

avahi_strerror(avahi_server_errno(mc.server)));

1688

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

1689

avahi_strerror(avahi_server_errno(mc.server)));

2183

1690

exitcode = EX_UNAVAILABLE;

2184

1691

goto end;

2185

1692

}

2191

1698

/* Run the main loop */

2192

1699

2193

1700

if(debug){

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

}

1701

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

1702

}

1703

1704

avahi_simple_poll_loop(mc.simple_poll);

2203

1705

2204

1706

end:

2205

1707

2206

1708

if(debug){

2207

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

1709

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

2208

1710

}

2209

1711

2210

1712

/* Cleanup things */

2227

1729

gpgme_release(mc.ctx);

2228

1730

}

2229

1731

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

{

1732

/* Take down the network interface */

1733

if(take_down_interface){

1734

/* Re-raise priviliges */

2246

1735

errno = 0;

2247

1736

ret = seteuid(0);

2248

1737

if(ret == -1){

2249

perror_plus("seteuid");

1738

perror("seteuid");

2250

1739

}

2251

2252

/* Take down the network interface */

2253

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

1740

if(geteuid() == 0){

2254

1741

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

2255

1742

if(ret == -1){

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

1743

perror("ioctl SIOCGIFFLAGS");

1744

} else if(network.ifr_flags & IFF_UP) {

2258

1745

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

2259

1746

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

2260

1747

if(ret == -1){

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1748

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2262

1749

}

2263

1750

}

2264

1751

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

2265

1752

if(ret == -1){

2266

perror_plus("close");

1753

perror("close");

1754

}

1755

/* Lower privileges permanently */

1756

errno = 0;

1757

ret = setuid(uid);

1758

if(ret == -1){

1759

perror("setuid");

2267

1760

}

2268

1761

}

2269

1762

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2276

1763

2277

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

1764

/* Removes the temp directory used by GPGME */

2278

1765

if(tempdir_created){

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];

1766

DIR *d;

1767

struct dirent *direntry;

1768

d = opendir(tempdir);

1769

if(d == NULL){

1770

if(errno != ENOENT){

1771

perror("opendir");

1772

}

1773

} else {

1774

while(true){

1775

direntry = readdir(d);

1776

if(direntry == NULL){

1777

break;

1778

}

1779

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

1780

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

1781

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

1782

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

1783

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

1784

continue;

1785

}

2286

1786

char *fullname = NULL;

2287

1787

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

2288

1788

direntry->d_name);

2289

1789

if(ret < 0){

2290

perror_plus("asprintf");

1790

perror("asprintf");

2291

1791

continue;

2292

1792

}

2293

1793

ret = remove(fullname);

2294

1794

if(ret == -1){

2295

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

2296

strerror(errno));

1795

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

1796

strerror(errno));

2297

1797

}

2298

1798

free(fullname);

2299

1799

}

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");

1800

closedir(d);

2306

1801

}

2307

1802

ret = rmdir(tempdir);

2308

1803

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

2309

perror_plus("rmdir");

1804

perror("rmdir");

2310

1805

}

2311

1806

}

2312

1807

2317

1812

&old_sigterm_action,

2318

1813

NULL));

2319

1814

if(ret == -1){

2320

perror_plus("sigaction");

1815

perror("sigaction");

2321

1816

}

2322

1817

do {

2323

1818

ret = raise(signal_received);

2324

1819

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

2325

1820

if(ret != 0){

2326

perror_plus("raise");

1821

perror("raise");

2327

1822

abort();

2328

1823

}

2329

1824

TEMP_FAILURE_RETRY(pause());