/mandos/release : revision 237.17.5

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

10

*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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32

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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

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strtoimax() */

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

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

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

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

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program_invocation_short_name */

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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*/

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

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

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setgid(), pause() */

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

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

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

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

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

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argp_state, struct argp,

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85

raise() */

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

86

87

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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91

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92

#ifdef __linux__

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93

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

107

111

init_gnutls_session(),

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112

GNUTLS_* */

109

113

#include <gnutls/openpgp.h>

110

/* gnutls_certificate_set_openpgp_key_file(),

111

GNUTLS_OPENPGP_FMT_BASE64 */

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

112

116

113

117

/* GPGME */

114

118

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

122

126

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

123

127

#define SECKEY "seckey.txt"

124

128

#define PUBKEY "pubkey.txt"

129

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

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130

126

131

bool debug = false;

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132

static const char mandos_protocol_version[] = "1";

128

133

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

129

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

134

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

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135

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

131

136

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 */

140

typedef struct server{

141

const char *ip;

142

uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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struct server *next;

147

struct server *prev;

148

} server;

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149

133

150

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

134

151

typedef struct {

139

156

gnutls_dh_params_t dh_params;

140

157

const char *priority;

141

158

gpgme_ctx_t ctx;

159

server *current_server;

142

160

} mandos_context;

143

161

144

162

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

145

163

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

146

164

.dh_bits = 1024, .priority = "SECURE256"

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

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

166

.current_server = NULL };

148

167

149

168

sig_atomic_t quit_now = 0;

150

169

int signal_received = 0;

151

170

171

/* Function to use when printing errors */

172

void perror_plus(const char *print_text){

173

int e = errno;

174

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

175

program_invocation_short_name);

176

errno = e;

177

perror(print_text);

178

}

179

180

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

181

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

182

va_list ap;

183

va_start (ap, format);

184

185

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

186

program_invocation_short_name));

187

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

188

}

189

152

190

/*

153

191

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

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192

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

155

193

* "buffer_length" is how much is already used.

156

194

*/

157

195

size_t incbuffer(char **buffer, size_t buffer_length,

158

size_t buffer_capacity){

196

size_t buffer_capacity){

159

197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

160

198

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

161

199

if(buffer == NULL){

166

204

return buffer_capacity;

167

205

}

168

206

207

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

208

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

209

int af){

210

int ret;

211

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

212

if(new_server == NULL){

213

perror_plus("malloc");

214

return false;

215

}

216

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

217

.port = port,

218

.if_index = if_index,

219

.af = af };

220

if(new_server->ip == NULL){

221

perror_plus("strdup");

222

return false;

223

}

224

/* Special case of first server */

225

if (mc.current_server == NULL){

226

new_server->next = new_server;

227

new_server->prev = new_server;

228

mc.current_server = new_server;

229

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

230

} else {

231

new_server->next = mc.current_server;

232

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

233

new_server->prev->next = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

240

}

241

return true;

242

}

243

169

244

/*

170

245

* Initialize GPGME.

171

246

*/

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

247

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

248

const char *tempdir){

174

249

gpgme_error_t rc;

175

250

gpgme_engine_info_t engine_info;

176

251

185

260

186

261

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

187

262

if(fd == -1){

188

perror("open");

263

perror_plus("open");

189

264

return false;

190

265

}

191

266

192

267

rc = gpgme_data_new_from_fd(&pgp_data, fd);

193

268

if(rc != GPG_ERR_NO_ERROR){

194

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

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gpgme_strsource(rc), gpgme_strerror(rc));

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

196

271

return false;

197

272

}

198

273

199

274

rc = gpgme_op_import(mc.ctx, pgp_data);

200

275

if(rc != GPG_ERR_NO_ERROR){

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

203

278

return false;

204

279

}

205

280

206

281

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

207

282

if(ret == -1){

208

perror("close");

283

perror_plus("close");

209

284

}

210

285

gpgme_data_release(pgp_data);

211

286

return true;

212

287

}

213

288

214

289

if(debug){

215

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

290

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

216

291

}

217

292

218

293

/* Init GPGME */

219

294

gpgme_check_version(NULL);

220

295

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

221

296

if(rc != GPG_ERR_NO_ERROR){

222

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

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gpgme_strsource(rc), gpgme_strerror(rc));

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

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299

return false;

225

300

}

226

301

227

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

302

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

228

303

rc = gpgme_get_engine_info(&engine_info);

229

304

if(rc != GPG_ERR_NO_ERROR){

230

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

231

gpgme_strsource(rc), gpgme_strerror(rc));

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

232

307

return false;

233

308

}

234

309

while(engine_info != NULL){

240

315

engine_info = engine_info->next;

241

316

}

242

317

if(engine_info == NULL){

243

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

318

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

319

tempdir);

244

320

return false;

245

321

}

246

322

247

323

/* Create new GPGME "context" */

248

324

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

249

325

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

326

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

327

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

328

gpgme_strerror(rc));

252

329

return false;

253

330

}

254

331

273

350

ssize_t plaintext_length = 0;

274

351

275

352

if(debug){

276

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

353

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

277

354

}

278

355

279

356

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

280

357

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

358

0);

282

359

if(rc != GPG_ERR_NO_ERROR){

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

285

362

return -1;

286

363

}

287

364

288

365

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

289

366

rc = gpgme_data_new(&dh_plain);

290

367

if(rc != GPG_ERR_NO_ERROR){

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

293

371

gpgme_data_release(dh_crypto);

294

372

return -1;

295

373

}

298

376

data buffer */

299

377

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

300

378

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

303

381

plaintext_length = -1;

304

382

if(debug){

305

383

gpgme_decrypt_result_t result;

306

384

result = gpgme_op_decrypt_result(mc.ctx);

307

385

if(result == NULL){

308

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

386

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

309

387

} else {

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

314

392

if(result->file_name != NULL){

315

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

393

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

316

394

}

317

395

gpgme_recipient_t recipient;

318

396

recipient = result->recipients;

319

397

while(recipient != NULL){

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");

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");

326

405

recipient = recipient->next;

327

406

}

328

407

}

331

410

}

332

411

333

412

if(debug){

334

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

413

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

335

414

}

336

415

337

416

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

338

417

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

339

perror("gpgme_data_seek");

418

perror_plus("gpgme_data_seek");

340

419

plaintext_length = -1;

341

420

goto decrypt_end;

342

421

}

344

423

*plaintext = NULL;

345

424

while(true){

346

425

plaintext_capacity = incbuffer(plaintext,

347

(size_t)plaintext_length,

348

plaintext_capacity);

426

(size_t)plaintext_length,

427

plaintext_capacity);

349

428

if(plaintext_capacity == 0){

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

353

432

}

354

433

355

434

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

360

439

break;

361

440

}

362

441

if(ret < 0){

363

perror("gpgme_data_read");

442

perror_plus("gpgme_data_read");

364

443

plaintext_length = -1;

365

444

goto decrypt_end;

366

445

}

368

447

}

369

448

370

449

if(debug){

371

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

450

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

372

451

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

373

452

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

374

453

}

396

475

/* GnuTLS log function callback */

397

476

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

398

477

const char* string){

399

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

478

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

400

479

}

401

480

402

481

static int init_gnutls_global(const char *pubkeyfilename,

404

483

int ret;

405

484

406

485

if(debug){

407

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

486

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

408

487

}

409

488

410

489

ret = gnutls_global_init();

411

490

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

414

493

return -1;

415

494

}

416

495

423

502

}

424

503

425

504

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

506

if(ret != GNUTLS_E_SUCCESS){

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

507

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

508

safer_gnutls_strerror(ret));

433

509

gnutls_global_deinit();

434

510

return -1;

435

511

}

436

512

437

513

if(debug){

438

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

439

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

440

seckeyfilename);

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

441

518

}

442

519

443

520

ret = gnutls_certificate_set_openpgp_key_file

444

521

(mc.cred, pubkeyfilename, seckeyfilename,

445

522

GNUTLS_OPENPGP_FMT_BASE64);

446

523

if(ret != GNUTLS_E_SUCCESS){

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));

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));

452

529

goto globalfail;

453

530

}

454

531

455

532

/* GnuTLS server initialization */

456

533

ret = gnutls_dh_params_init(&mc.dh_params);

457

534

if(ret != GNUTLS_E_SUCCESS){

458

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

459

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

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

460

538

goto globalfail;

461

539

}

462

540

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

463

541

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

542

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

543

safer_gnutls_strerror(ret));

466

544

goto globalfail;

467

545

}

468

546

488

566

}

489

567

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

490

568

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

493

572

}

494

573

495

574

{

502

581

}

503

582

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

504

583

if(ret != GNUTLS_E_SUCCESS){

505

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

506

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

507

safer_gnutls_strerror(ret));

584

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

585

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

586

safer_gnutls_strerror(ret));

508

587

gnutls_deinit(*session);

509

588

return -1;

510

589

}

519

598

}

520

599

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

521

600

if(ret != GNUTLS_E_SUCCESS){

522

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

523

safer_gnutls_strerror(ret));

601

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

602

safer_gnutls_strerror(ret));

524

603

gnutls_deinit(*session);

525

604

return -1;

526

605

}

571

650

pf = PF_INET;

572

651

break;

573

652

default:

574

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

653

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

575

654

errno = EINVAL;

576

655

return -1;

577

656

}

582

661

}

583

662

584

663

if(debug){

585

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

586

"\n", ip, port);

664

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

665

PRIu16 "\n", ip, port);

587

666

}

588

667

589

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

669

if(tcp_sd < 0){

591

670

int e = errno;

592

perror("socket");

671

perror_plus("socket");

593

672

errno = e;

594

673

goto mandos_end;

595

674

}

609

688

}

610

689

if(ret < 0 ){

611

690

int e = errno;

612

perror("inet_pton");

691

perror_plus("inet_pton");

613

692

errno = e;

614

693

goto mandos_end;

615

694

}

616

695

if(ret == 0){

617

696

int e = errno;

618

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

697

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

619

698

errno = e;

620

699

goto mandos_end;

621

700

}

626

705

627

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

707

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

629

-Wunreachable-code*/

708

-Wunreachable-code*/

630

709

if(if_index == AVAHI_IF_UNSPEC){

631

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

632

" without a network interface\n");

710

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

711

" incomplete without a network interface\n");

633

712

errno = EINVAL;

634

713

goto mandos_end;

635

714

}

651

730

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

652

731

char interface[IF_NAMESIZE];

653

732

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

654

perror("if_indextoname");

733

perror_plus("if_indextoname");

655

734

} else {

656

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

657

ip, interface, port);

735

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

736

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

658

737

}

659

738

} else {

660

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

661

port);

739

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

740

ip, port);

662

741

}

663

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

671

750

sizeof(addrstr));

672

751

}

673

752

if(pcret == NULL){

674

perror("inet_ntop");

753

perror_plus("inet_ntop");

675

754

} else {

676

755

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

677

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

756

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

678

757

}

679

758

}

680

759

}

690

769

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

691

770

}

692

771

if(ret < 0){

693

int e = errno;

694

perror("connect");

695

errno = e;

772

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

773

int e = errno;

774

perror_plus("connect");

775

errno = e;

776

}

696

777

goto mandos_end;

697

778

}

698

779

706

787

while(true){

707

788

size_t out_size = strlen(out);

708

789

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

709

out_size - written));

790

out_size - written));

710

791

if(ret == -1){

711

792

int e = errno;

712

perror("write");

793

perror_plus("write");

713

794

errno = e;

714

795

goto mandos_end;

715

796

}

732

813

}

733

814

734

815

if(debug){

735

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

816

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

736

817

}

737

818

738

819

if(quit_now){

740

821

goto mandos_end;

741

822

}

742

823

824

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

743

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

744

826

745

827

if(quit_now){

757

839

758

840

if(ret != GNUTLS_E_SUCCESS){

759

841

if(debug){

760

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

842

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

761

843

gnutls_perror(ret);

762

844

}

763

845

errno = EPROTO;

767

849

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

768

850

769

851

if(debug){

770

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

771

ip);

852

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

853

" %s\n", ip);

772

854

}

773

855

774

856

while(true){

779

861

}

780

862

781

863

buffer_capacity = incbuffer(&buffer, buffer_length,

782

buffer_capacity);

864

buffer_capacity);

783

865

if(buffer_capacity == 0){

784

866

int e = errno;

785

perror("incbuffer");

867

perror_plus("incbuffer");

786

868

errno = e;

787

869

goto mandos_end;

788

870

}

812

894

}

813

895

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

814

896

if(ret < 0){

815

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

897

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

898

"***\n");

816

899

gnutls_perror(ret);

817

900

errno = EPROTO;

818

901

goto mandos_end;

819

902

}

820

903

break;

821

904

default:

822

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

823

" encrypted session with Mandos server\n");

905

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

906

" encrypted session with Mandos server\n");

824

907

gnutls_bye(session, GNUTLS_SHUT_RDWR);

825

908

errno = EIO;

826

909

goto mandos_end;

831

914

}

832

915

833

916

if(debug){

834

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

917

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

835

918

}

836

919

837

920

if(quit_now){

849

932

850

933

if(buffer_length > 0){

851

934

ssize_t decrypted_buffer_size;

852

decrypted_buffer_size = pgp_packet_decrypt(buffer,

853

buffer_length,

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

854

936

&decrypted_buffer);

855

937

if(decrypted_buffer_size >= 0){

856

938

867

949

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

868

950

int e = errno;

869

951

if(debug){

870

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

871

strerror(errno));

952

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

953

strerror(errno));

872

954

}

873

955

errno = e;

874

956

goto mandos_end;

893

975

if(e == 0){

894

976

e = errno;

895

977

}

896

perror("close");

978

perror_plus("close");

897

979

}

898

980

gnutls_deinit(session);

981

errno = e;

899

982

if(quit_now){

900

e = EINTR;

983

errno = EINTR;

901

984

retval = -1;

902

985

}

903

errno = e;

904

986

}

905

987

return retval;

906

988

}

931

1013

switch(event){

932

1014

default:

933

1015

case AVAHI_RESOLVER_FAILURE:

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)));

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)));

937

1020

break;

938

1021

939

1022

case AVAHI_RESOLVER_FOUND:

941

1024

char ip[AVAHI_ADDRESS_STR_MAX];

942

1025

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

943

1026

if(debug){

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);

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);

947

1030

}

948

1031

int ret = start_mandos_communication(ip, port, interface,

949

1032

avahi_proto_to_af(proto));

950

1033

if(ret == 0){

951

1034

avahi_simple_poll_quit(mc.simple_poll);

1035

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1038

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

1039

" list\n", name);

1040

}

952

1041

}

953

1042

}

954

1043

}

978

1067

default:

979

1068

case AVAHI_BROWSER_FAILURE:

980

1069

981

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

982

avahi_strerror(avahi_server_errno(mc.server)));

1070

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

983

1072

avahi_simple_poll_quit(mc.simple_poll);

984

1073

return;

985

1074

992

1081

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

993

1082

name, type, domain, protocol, 0,

994

1083

resolve_callback, NULL) == NULL)

995

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

996

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

1084

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

1085

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

997

1087

break;

998

1088

999

1089

case AVAHI_BROWSER_REMOVE:

1002

1092

case AVAHI_BROWSER_ALL_FOR_NOW:

1003

1093

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1004

1094

if(debug){

1005

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

1095

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

1096

" searching...\n");

1006

1097

}

1007

1098

break;

1008

1099

}

1009

1100

}

1010

1101

1011

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

1102

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

1012

1103

static void handle_sigterm(int sig){

1013

1104

if(quit_now){

1014

1105

return;

1016

1107

quit_now = 1;

1017

1108

signal_received = sig;

1018

1109

int old_errno = errno;

1110

/* set main loop to exit */

1019

1111

if(mc.simple_poll != NULL){

1020

1112

avahi_simple_poll_quit(mc.simple_poll);

1021

1113

}

1022

1114

errno = old_errno;

1023

1115

}

1024

1116

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){

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){

1079

1128

if(debug){

1080

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

1081

flagstring, if_entry->d_name);

1129

perror_plus("ioctl SIOCGIFFLAGS");

1082

1130

}

1083

free(flagstring);

1084

return 0;

1131

return false;

1085

1132

}

1086

free(flagstring);

1087

ifreq_flags flags = (ifreq_flags)tmpmax;

1133

return true;

1134

}

1135

1136

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

1137

1088

1138

/* Reject the loopback device */

1089

if(flags & IFF_LOOPBACK){

1139

if(ifr->ifr_flags & IFF_LOOPBACK){

1090

1140

if(debug){

1091

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

1092

if_entry->d_name);

1141

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

1142

ifname);

1093

1143

}

1094

return 0;

1144

return false;

1095

1145

}

1096

1146

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

1097

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

1147

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

1098

1148

if(debug){

1099

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

1100

if_entry->d_name);

1149

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

1150

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

1101

1151

}

1102

return 1;

1152

return true;

1103

1153

}

1104

1154

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

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

}

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

1112

1171

/* Accept this device */

1113

1172

if(debug){

1114

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

1115

if_entry->d_name);

1116

}

1117

return 1;

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);

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;

1118

1524

}

1119

1525

1120

1526

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

1139

1545

bool gnutls_initialized = false;

1140

1546

bool gpgme_initialized = false;

1141

1547

float delay = 2.5f;

1548

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

1549

retrying the same server again */

1142

1550

1143

1551

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1144

1552

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1150

1558

errno = 0;

1151

1559

ret = setgid(gid);

1152

1560

if(ret == -1){

1153

perror("setgid");

1561

perror_plus("setgid");

1154

1562

}

1155

1563

1156

1564

/* Lower user privileges (temporarily) */

1157

1565

errno = 0;

1158

1566

ret = seteuid(uid);

1159

1567

if(ret == -1){

1160

perror("seteuid");

1568

perror_plus("seteuid");

1161

1569

}

1162

1570

1163

1571

if(quit_now){

1198

1606

.arg = "SECONDS",

1199

1607

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

1200

1608

.group = 2 },

1609

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

1610

.arg = "SECONDS",

1611

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

1612

.group = 2 },

1613

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

1614

.arg = "DIR",

1615

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

1616

.group = 2 },

1201

1617

/*

1202

1618

* These reproduce what we would get without ARGP_NO_HELP

1203

1619

*/

1247

1663

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

1248

1664

argp_error(state, "Bad delay");

1249

1665

}

1666

case 132: /* --retry */

1667

errno = 0;

1668

retry_interval = strtod(arg, &tmp);

1669

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

1670

or (retry_interval * 1000) > INT_MAX

1671

or retry_interval < 0){

1672

argp_error(state, "Bad retry interval");

1673

}

1674

break;

1675

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

1676

hookdir = arg;

1250

1677

break;

1251

1678

/*

1252

1679

* These reproduce what we would get without ARGP_NO_HELP

1259

1686

argp_state_help(state, state->out_stream,

1260

1687

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1261

1688

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

1262

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

1689

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

1263

1690

exit(argp_err_exit_status);

1264

1691

break;

1265

1692

default:

1280

1707

case ENOMEM:

1281

1708

default:

1282

1709

errno = ret;

1283

perror("argp_parse");

1710

perror_plus("argp_parse");

1284

1711

exitcode = EX_OSERR;

1285

1712

goto end;

1286

1713

case EINVAL:

1288

1715

goto end;

1289

1716

}

1290

1717

}

1718

1719

{

1720

/* Work around Debian bug #633582:

1721

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

1722

1723

/* Re-raise priviliges */

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

1728

} else {

1729

struct stat st;

1730

1731

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

1732

int seckey_fd = open(seckey, O_RDONLY);

1733

if(seckey_fd == -1){

1734

perror_plus("open");

1735

} else {

1736

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

1737

if(ret == -1){

1738

perror_plus("fstat");

1739

} else {

1740

if(S_ISREG(st.st_mode)

1741

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

1742

ret = fchown(seckey_fd, uid, gid);

1743

if(ret == -1){

1744

perror_plus("fchown");

1745

}

1746

}

1747

}

1748

TEMP_FAILURE_RETRY(close(seckey_fd));

1749

}

1750

}

1751

1752

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

1753

int pubkey_fd = open(pubkey, O_RDONLY);

1754

if(pubkey_fd == -1){

1755

perror_plus("open");

1756

} else {

1757

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

1758

if(ret == -1){

1759

perror_plus("fstat");

1760

} else {

1761

if(S_ISREG(st.st_mode)

1762

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

1763

ret = fchown(pubkey_fd, uid, gid);

1764

if(ret == -1){

1765

perror_plus("fchown");

1766

}

1767

}

1768

}

1769

TEMP_FAILURE_RETRY(close(pubkey_fd));

1770

}

1771

}

1772

1773

/* Lower privileges */

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1779

}

1780

}

1781

1782

/* Run network hooks */

1783

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

1784

goto end;

1785

}

1291

1786

1292

1787

if(not debug){

1293

1788

avahi_set_log_function(empty_log);

1294

1789

}

1295

1790

1296

1791

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

1297

1792

struct dirent **direntries;

1298

ret = scandir(sys_class_net, &direntries, good_interface,

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1299

1795

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1300

1802

if(ret >= 1){

1301

/* Pick the first good interface */

1803

/* Pick the first interface returned */

1302

1804

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

1303

1805

if(debug){

1304

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

1806

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

1305

1807

}

1306

1808

if(interface == NULL){

1307

perror("malloc");

1809

perror_plus("malloc");

1308

1810

free(direntries);

1309

1811

exitcode = EXIT_FAILURE;

1310

1812

goto end;

1312

1814

free(direntries);

1313

1815

} else {

1314

1816

free(direntries);

1315

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

1817

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

1316

1818

exitcode = EXIT_FAILURE;

1317

1819

goto end;

1318

1820

}

1324

1826

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

1325

1827

mc.simple_poll = avahi_simple_poll_new();

1326

1828

if(mc.simple_poll == NULL){

1327

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

1829

fprintf_plus(stderr,

1830

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

1328

1831

exitcode = EX_UNAVAILABLE;

1329

1832

goto end;

1330

1833

}

1332

1835

sigemptyset(&sigterm_action.sa_mask);

1333

1836

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

1334

1837

if(ret == -1){

1335

perror("sigaddset");

1838

perror_plus("sigaddset");

1336

1839

exitcode = EX_OSERR;

1337

1840

goto end;

1338

1841

}

1339

1842

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

1340

1843

if(ret == -1){

1341

perror("sigaddset");

1844

perror_plus("sigaddset");

1342

1845

exitcode = EX_OSERR;

1343

1846

goto end;

1344

1847

}

1345

1848

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

1346

1849

if(ret == -1){

1347

perror("sigaddset");

1850

perror_plus("sigaddset");

1348

1851

exitcode = EX_OSERR;

1349

1852

goto end;

1350

1853

}

1354

1857

*/

1355

1858

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

1356

1859

if(ret == -1){

1357

perror("sigaction");

1860

perror_plus("sigaction");

1358

1861

return EX_OSERR;

1359

1862

}

1360

1863

if(old_sigterm_action.sa_handler != SIG_IGN){

1361

1864

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

1362

1865

if(ret == -1){

1363

perror("sigaction");

1866

perror_plus("sigaction");

1364

1867

exitcode = EX_OSERR;

1365

1868

goto end;

1366

1869

}

1367

1870

}

1368

1871

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

1369

1872

if(ret == -1){

1370

perror("sigaction");

1873

perror_plus("sigaction");

1371

1874

return EX_OSERR;

1372

1875

}

1373

1876

if(old_sigterm_action.sa_handler != SIG_IGN){

1374

1877

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

1375

1878

if(ret == -1){

1376

perror("sigaction");

1879

perror_plus("sigaction");

1377

1880

exitcode = EX_OSERR;

1378

1881

goto end;

1379

1882

}

1380

1883

}

1381

1884

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

1382

1885

if(ret == -1){

1383

perror("sigaction");

1886

perror_plus("sigaction");

1384

1887

return EX_OSERR;

1385

1888

}

1386

1889

if(old_sigterm_action.sa_handler != SIG_IGN){

1387

1890

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

1388

1891

if(ret == -1){

1389

perror("sigaction");

1892

perror_plus("sigaction");

1390

1893

exitcode = EX_OSERR;

1391

1894

goto end;

1392

1895

}

1396

1899

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

1397

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1398

1901

if(if_index == 0){

1399

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

1902

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

1400

1903

exitcode = EX_UNAVAILABLE;

1401

1904

goto end;

1402

1905

}

1409

1912

errno = 0;

1410

1913

ret = seteuid(0);

1411

1914

if(ret == -1){

1412

perror("seteuid");

1915

perror_plus("seteuid");

1413

1916

}

1414

1917

1415

1918

#ifdef __linux__

1419

1922

bool restore_loglevel = true;

1420

1923

if(ret == -1){

1421

1924

restore_loglevel = false;

1422

perror("klogctl");

1925

perror_plus("klogctl");

1423

1926

}

1424

1927

#endif /* __linux__ */

1425

1928

1426

1929

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1427

1930

if(sd < 0){

1428

perror("socket");

1931

perror_plus("socket");

1429

1932

exitcode = EX_OSERR;

1430

1933

#ifdef __linux__

1431

1934

if(restore_loglevel){

1432

1935

ret = klogctl(7, NULL, 0);

1433

1936

if(ret == -1){

1434

perror("klogctl");

1937

perror_plus("klogctl");

1435

1938

}

1436

1939

}

1437

1940

#endif /* __linux__ */

1439

1942

errno = 0;

1440

1943

ret = seteuid(uid);

1441

1944

if(ret == -1){

1442

perror("seteuid");

1945

perror_plus("seteuid");

1443

1946

}

1444

1947

goto end;

1445

1948

}

1446

1949

strcpy(network.ifr_name, interface);

1447

1950

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

1448

1951

if(ret == -1){

1449

perror("ioctl SIOCGIFFLAGS");

1952

perror_plus("ioctl SIOCGIFFLAGS");

1450

1953

#ifdef __linux__

1451

1954

if(restore_loglevel){

1452

1955

ret = klogctl(7, NULL, 0);

1453

1956

if(ret == -1){

1454

perror("klogctl");

1957

perror_plus("klogctl");

1455

1958

}

1456

1959

}

1457

1960

#endif /* __linux__ */

1460

1963

errno = 0;

1461

1964

ret = seteuid(uid);

1462

1965

if(ret == -1){

1463

perror("seteuid");

1966

perror_plus("seteuid");

1464

1967

}

1465

1968

goto end;

1466

1969

}

1470

1973

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

1471

1974

if(ret == -1){

1472

1975

take_down_interface = false;

1473

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1474

1977

exitcode = EX_OSERR;

1475

1978

#ifdef __linux__

1476

1979

if(restore_loglevel){

1477

1980

ret = klogctl(7, NULL, 0);

1478

1981

if(ret == -1){

1479

perror("klogctl");

1982

perror_plus("klogctl");

1480

1983

}

1481

1984

}

1482

1985

#endif /* __linux__ */

1484

1987

errno = 0;

1485

1988

ret = seteuid(uid);

1486

1989

if(ret == -1){

1487

perror("seteuid");

1990

perror_plus("seteuid");

1488

1991

}

1489

1992

goto end;

1490

1993

}

1491

1994

}

1492

/* sleep checking until interface is running */

1995

/* Sleep checking until interface is running.

1996

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

1493

1997

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

1494

1998

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

1495

1999

if(ret == -1){

1496

perror("ioctl SIOCGIFFLAGS");

2000

perror_plus("ioctl SIOCGIFFLAGS");

1497

2001

} else if(network.ifr_flags & IFF_RUNNING){

1498

2002

break;

1499

2003

}

1500

2004

struct timespec sleeptime = { .tv_nsec = 250000000 };

1501

2005

ret = nanosleep(&sleeptime, NULL);

1502

2006

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

1503

perror("nanosleep");

2007

perror_plus("nanosleep");

1504

2008

}

1505

2009

}

1506

2010

if(not take_down_interface){

1507

2011

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

1508

2012

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

1509

2013

if(ret == -1){

1510

perror("close");

2014

perror_plus("close");

1511

2015

}

1512

2016

}

1513

2017

#ifdef __linux__

1515

2019

/* Restores kernel loglevel to default */

1516

2020

ret = klogctl(7, NULL, 0);

1517

2021

if(ret == -1){

1518

perror("klogctl");

2022

perror_plus("klogctl");

1519

2023

}

1520

2024

}

1521

2025

#endif /* __linux__ */

1522

2026

/* Lower privileges */

1523

2027

errno = 0;

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

}

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

1536

2032

}

1537

2033

}

1538

2034

1542

2038

1543

2039

ret = init_gnutls_global(pubkey, seckey);

1544

2040

if(ret == -1){

1545

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

2041

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

1546

2042

exitcode = EX_UNAVAILABLE;

1547

2043

goto end;

1548

2044

} else {

1553

2049

goto end;

1554

2050

}

1555

2051

2052

if(mkdtemp(tempdir) == NULL){

2053

perror_plus("mkdtemp");

2054

goto end;

2055

}

1556

2056

tempdir_created = true;

1557

if(mkdtemp(tempdir) == NULL){

1558

tempdir_created = false;

1559

perror("mkdtemp");

1560

goto end;

1561

}

1562

2057

1563

2058

if(quit_now){

1564

2059

goto end;

1565

2060

}

1566

2061

1567

2062

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

1568

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

2063

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

1569

2064

exitcode = EX_UNAVAILABLE;

1570

2065

goto end;

1571

2066

} else {

1581

2076

/* (Mainly meant for debugging) */

1582

2077

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

1583

2078

if(address == NULL){

1584

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

2079

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

1585

2080

exitcode = EX_USAGE;

1586

2081

goto end;

1587

2082

}

1595

2090

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

1596

2091

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

1597

2092

or tmpmax != (uint16_t)tmpmax){

1598

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

2093

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

1599

2094

exitcode = EX_USAGE;

1600

2095

goto end;

1601

2096

}

1606

2101

1607

2102

port = (uint16_t)tmpmax;

1608

2103

*address = '\0';

1609

address = connect_to;

1610

2104

/* Colon in address indicates IPv6 */

1611

2105

int af;

1612

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

2106

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

1613

2107

af = AF_INET6;

2108

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

2109

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

2110

{

2111

connect_to++;

2112

address[-1] = '\0';

2113

}

1614

2114

} else {

1615

2115

af = AF_INET;

1616

2116

}

2117

address = connect_to;

1617

2118

1618

2119

if(quit_now){

1619

2120

goto end;

1620

2121

}

1621

2122

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 {

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){

1644

2136

exitcode = EXIT_SUCCESS;

1645

2137

}

2138

1646

2139

goto end;

1647

2140

}

1648

2141

1670

2163

1671

2164

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

1672

2165

if(mc.server == NULL){

1673

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

1674

avahi_strerror(error));

2166

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

2167

avahi_strerror(error));

1675

2168

exitcode = EX_UNAVAILABLE;

1676

2169

goto end;

1677

2170

}

1685

2178

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1686

2179

NULL, 0, browse_callback, NULL);

1687

2180

if(sb == NULL){

1688

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

1689

avahi_strerror(avahi_server_errno(mc.server)));

2181

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

2182

avahi_strerror(avahi_server_errno(mc.server)));

1690

2183

exitcode = EX_UNAVAILABLE;

1691

2184

goto end;

1692

2185

}

1698

2191

/* Run the main loop */

1699

2192

1700

2193

if(debug){

1701

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

1702

}

1703

1704

avahi_simple_poll_loop(mc.simple_poll);

2194

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

2195

}

2196

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

2199

if(debug){

2200

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

2201

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

2202

}

1705

2203

1706

2204

end:

1707

2205

1708

2206

if(debug){

1709

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

2207

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

1710

2208

}

1711

2209

1712

2210

/* Cleanup things */

1729

2227

gpgme_release(mc.ctx);

1730

2228

}

1731

2229

1732

/* Take down the network interface */

1733

if(take_down_interface){

1734

/* Re-raise priviliges */

2230

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

2231

has seen */

2232

if(mc.current_server != NULL){

2233

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

2234

while(mc.current_server != NULL){

2235

server *next = mc.current_server->next;

2236

free(mc.current_server);

2237

mc.current_server = next;

2238

}

2239

}

2240

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2244

/* Re-raise priviliges */

2245

{

1735

2246

errno = 0;

1736

2247

ret = seteuid(0);

1737

2248

if(ret == -1){

1738

perror("seteuid");

2249

perror_plus("seteuid");

1739

2250

}

1740

if(geteuid() == 0){

2251

2252

/* Take down the network interface */

2253

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

1741

2254

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

1742

2255

if(ret == -1){

1743

perror("ioctl SIOCGIFFLAGS");

1744

} else if(network.ifr_flags & IFF_UP) {

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

1745

2258

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

1746

2259

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

1747

2260

if(ret == -1){

1748

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1749

2262

}

1750

2263

}

1751

2264

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

1752

2265

if(ret == -1){

1753

perror("close");

1754

}

1755

/* Lower privileges permanently */

1756

errno = 0;

1757

ret = setuid(uid);

1758

if(ret == -1){

1759

perror("setuid");

2266

perror_plus("close");

1760

2267

}

1761

2268

}

1762

2269

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

1763

2276

1764

/* Removes the temp directory used by GPGME */

2277

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

1765

2278

if(tempdir_created){

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

}

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];

1786

2286

char *fullname = NULL;

1787

2287

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

1788

2288

direntry->d_name);

1789

2289

if(ret < 0){

1790

perror("asprintf");

2290

perror_plus("asprintf");

1791

2291

continue;

1792

2292

}

1793

2293

ret = remove(fullname);

1794

2294

if(ret == -1){

1795

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

1796

strerror(errno));

2295

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

2296

strerror(errno));

1797

2297

}

1798

2298

free(fullname);

1799

2299

}

1800

closedir(d);

2300

}

2301

2302

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

2303

free(direntries);

2304

if (numentries == -1){

2305

perror_plus("scandir");

1801

2306

}

1802

2307

ret = rmdir(tempdir);

1803

2308

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

1804

perror("rmdir");

2309

perror_plus("rmdir");

1805

2310

}

1806

2311

}

1807

2312

1812

2317

&old_sigterm_action,

1813

2318

NULL));

1814

2319

if(ret == -1){

1815

perror("sigaction");

2320

perror_plus("sigaction");

1816

2321

}

1817

2322

do {

1818

2323

ret = raise(signal_received);

1819

2324

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

1820

2325

if(ret != 0){

1821

perror("raise");

2326

perror_plus("raise");

1822

2327

abort();

1823

2328

}

1824

2329

TEMP_FAILURE_RETRY(pause());