/mandos/release : revision 300.1.1

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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32

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

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#include <stdio.h> /* fprintf(), stderr, fwrite(),

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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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 <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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*/

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

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

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setgid(), pause() */

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

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

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

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78

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

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79

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

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argp_state, struct argp,

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85

raise() */

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86

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

90

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

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91

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#ifdef __linux__

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93

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

107

111

init_gnutls_session(),

108

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

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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"

125

130

126

131

bool debug = false;

127

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>";

130

135

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

131

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

139

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

140

typedef struct server{

141

const char *ip;

142

uint16_t port;

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AvahiIfIndex if_index;

144

int af;

145

struct timespec last_seen;

146

struct server *next;

147

struct server *prev;

148

} server;

132

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,

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164

.dh_bits = 1024, .priority = "SECURE256"

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

165

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

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.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

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/*

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

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186

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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

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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

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289

if(debug){

215

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

290

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

216

291

}

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292

218

293

/* Init GPGME */

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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",

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gpgme_strsource(rc), gpgme_strerror(rc));

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299

return false;

225

300

}

226

301

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/* 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",

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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

}

692

771

if(ret < 0){

693

772

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

694

773

int e = errno;

695

perror("connect");

774

perror_plus("connect");

696

775

errno = e;

697

776

}

698

777

goto mandos_end;

708

787

while(true){

709

788

size_t out_size = strlen(out);

710

789

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

711

out_size - written));

790

out_size - written));

712

791

if(ret == -1){

713

792

int e = errno;

714

perror("write");

793

perror_plus("write");

715

794

errno = e;

716

795

goto mandos_end;

717

796

}

734

813

}

735

814

736

815

if(debug){

737

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

816

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

738

817

}

739

818

740

819

if(quit_now){

742

821

goto mandos_end;

743

822

}

744

823

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

824

/* This casting via intptr_t is to eliminate warning about casting

825

an int to a pointer type. This is exactly how the GnuTLS Guile

826

function "set-session-transport-fd!" does it. */

827

gnutls_transport_set_ptr(session,

828

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

746

829

747

830

if(quit_now){

748

831

errno = EINTR;

759

842

760

843

if(ret != GNUTLS_E_SUCCESS){

761

844

if(debug){

762

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

845

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

763

846

gnutls_perror(ret);

764

847

}

765

848

errno = EPROTO;

769

852

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

770

853

771

854

if(debug){

772

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

773

ip);

855

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

856

" %s\n", ip);

774

857

}

775

858

776

859

while(true){

781

864

}

782

865

783

866

buffer_capacity = incbuffer(&buffer, buffer_length,

784

buffer_capacity);

867

buffer_capacity);

785

868

if(buffer_capacity == 0){

786

869

int e = errno;

787

perror("incbuffer");

870

perror_plus("incbuffer");

788

871

errno = e;

789

872

goto mandos_end;

790

873

}

814

897

}

815

898

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

816

899

if(ret < 0){

817

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

900

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

901

"***\n");

818

902

gnutls_perror(ret);

819

903

errno = EPROTO;

820

904

goto mandos_end;

821

905

}

822

906

break;

823

907

default:

824

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

825

" encrypted session with Mandos server\n");

908

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

909

" encrypted session with Mandos server\n");

826

910

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

911

errno = EIO;

828

912

goto mandos_end;

833

917

}

834

918

835

919

if(debug){

836

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

920

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

837

921

}

838

922

839

923

if(quit_now){

851

935

852

936

if(buffer_length > 0){

853

937

ssize_t decrypted_buffer_size;

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

buffer_length,

938

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

856

939

&decrypted_buffer);

857

940

if(decrypted_buffer_size >= 0){

858

941

869

952

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

870

953

int e = errno;

871

954

if(debug){

872

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

873

strerror(errno));

955

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

956

strerror(errno));

874

957

}

875

958

errno = e;

876

959

goto mandos_end;

895

978

if(e == 0){

896

979

e = errno;

897

980

}

898

perror("close");

981

perror_plus("close");

899

982

}

900

983

gnutls_deinit(session);

984

errno = e;

901

985

if(quit_now){

902

e = EINTR;

986

errno = EINTR;

903

987

retval = -1;

904

988

}

905

errno = e;

906

989

}

907

990

return retval;

908

991

}

933

1016

switch(event){

934

1017

default:

935

1018

case AVAHI_RESOLVER_FAILURE:

936

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

937

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

938

avahi_strerror(avahi_server_errno(mc.server)));

1019

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

1020

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

1021

domain,

1022

avahi_strerror(avahi_server_errno(mc.server)));

939

1023

break;

940

1024

941

1025

case AVAHI_RESOLVER_FOUND:

943

1027

char ip[AVAHI_ADDRESS_STR_MAX];

944

1028

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

945

1029

if(debug){

946

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

947

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

948

ip, (intmax_t)interface, port);

1030

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

1031

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

1032

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

949

1033

}

950

1034

int ret = start_mandos_communication(ip, port, interface,

951

1035

avahi_proto_to_af(proto));

952

1036

if(ret == 0){

953

1037

avahi_simple_poll_quit(mc.simple_poll);

1038

} else {

1039

if(not add_server(ip, port, interface,

1040

avahi_proto_to_af(proto))){

1041

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

1042

" list\n", name);

1043

}

954

1044

}

955

1045

}

956

1046

}

980

1070

default:

981

1071

case AVAHI_BROWSER_FAILURE:

982

1072

983

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

984

avahi_strerror(avahi_server_errno(mc.server)));

1073

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

1074

avahi_strerror(avahi_server_errno(mc.server)));

985

1075

avahi_simple_poll_quit(mc.simple_poll);

986

1076

return;

987

1077

994

1084

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

995

1085

name, type, domain, protocol, 0,

996

1086

resolve_callback, NULL) == NULL)

997

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

998

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

1087

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

1088

" %s\n", name,

1089

avahi_strerror(avahi_server_errno(mc.server)));

999

1090

break;

1000

1091

1001

1092

case AVAHI_BROWSER_REMOVE:

1004

1095

case AVAHI_BROWSER_ALL_FOR_NOW:

1005

1096

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1006

1097

if(debug){

1007

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

1098

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

1099

" searching...\n");

1008

1100

}

1009

1101

break;

1010

1102

}

1011

1103

}

1012

1104

1013

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

1105

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

1014

1106

static void handle_sigterm(int sig){

1015

1107

if(quit_now){

1016

1108

return;

1018

1110

quit_now = 1;

1019

1111

signal_received = sig;

1020

1112

int old_errno = errno;

1113

/* set main loop to exit */

1021

1114

if(mc.simple_poll != NULL){

1022

1115

avahi_simple_poll_quit(mc.simple_poll);

1023

1116

}

1024

1117

errno = old_errno;

1025

1118

}

1026

1119

1027

/*

1028

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

1029

* corresponds to an acceptable network device.

1030

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

1031

*/

1032

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

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

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

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

1042

return 0;

1043

}

1044

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

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

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

1050

/* read line from flags_fd */

1051

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

1052

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

1053

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

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

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

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1070

break;

1071

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

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

1078

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

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1120

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

1121

int ret;

1122

1123

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

1124

if(s < 0){

1125

perror_plus("socket");

1126

return false;

1127

}

1128

strcpy(ifr->ifr_name, ifname);

1129

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1130

if(ret == -1){

1081

1131

if(debug){

1082

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

1083

flagstring, if_entry->d_name);

1132

perror_plus("ioctl SIOCGIFFLAGS");

1084

1133

}

1085

free(flagstring);

1086

return 0;

1134

return false;

1087

1135

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1136

return true;

1137

}

1138

1139

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

1140

1090

1141

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1142

if(ifr->ifr_flags & IFF_LOOPBACK){

1092

1143

if(debug){

1093

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

1094

if_entry->d_name);

1144

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

1145

ifname);

1095

1146

}

1096

return 0;

1147

return false;

1097

1148

}

1098

1149

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

1099

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

1150

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

1100

1151

if(debug){

1101

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

1102

if_entry->d_name);

1152

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

1153

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

1103

1154

}

1104

return 1;

1155

return true;

1105

1156

}

1106

1157

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

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

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

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1158

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

1159

if(debug){

1160

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1161

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

1162

}

1163

return false;

1164

}

1165

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

1166

if(ifr->ifr_flags & IFF_NOARP){

1167

if(debug){

1168

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

1169

ifname);

1170

}

1171

return false;

1172

}

1173

1114

1174

/* Accept this device */

1115

1175

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1176

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

1177

}

1178

return true;

1179

}

1180

1181

/*

1182

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

1183

* corresponds to an acceptable network device.

1184

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

1185

*/

1186

int good_interface(const struct dirent *if_entry){

1187

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

1188

return 0;

1189

}

1190

1191

struct ifreq ifr;

1192

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

1193

if(debug){

1194

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

1195

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

1196

}

1197

return 0;

1198

}

1199

1200

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

1201

return 0;

1202

}

1203

return 1;

1204

}

1205

1206

/*

1207

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

1208

* corresponds to an acceptable network device which is up.

1209

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

1210

*/

1211

int up_interface(const struct dirent *if_entry){

1212

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

1213

return 0;

1214

}

1215

1216

struct ifreq ifr;

1217

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

1218

if(debug){

1219

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

1220

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

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject down interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

/* Reject non-running interfaces */

1235

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

1236

if(debug){

1237

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

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

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

1244

return 0;

1245

}

1246

return 1;

1247

}

1248

1249

int notdotentries(const struct dirent *direntry){

1250

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

1251

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

1252

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

1253

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

1254

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

1255

return 0;

1256

}

1257

return 1;

1258

}

1259

1260

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

1261

int runnable_hook(const struct dirent *direntry){

1262

int ret;

1263

size_t sret;

1264

struct stat st;

1265

1266

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

1267

/* Empty name? */

1268

return 0;

1269

}

1270

1271

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

1272

"abcdefghijklmnopqrstuvwxyz"

1273

"0123456789"

1274

"_-");

1275

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

1276

/* Contains non-allowed characters */

1277

if(debug){

1278

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

1279

direntry->d_name);

1280

}

1281

return 0;

1282

}

1283

1284

char *fullname = NULL;

1285

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

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1292

if(ret == -1){

1293

if(debug){

1294

perror_plus("Could not stat hook");

1295

}

1296

return 0;

1297

}

1298

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

1299

/* Not a regular file */

1300

if(debug){

1301

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

1302

direntry->d_name);

1303

}

1304

return 0;

1305

}

1306

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

1307

/* Not executable */

1308

if(debug){

1309

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

1310

direntry->d_name);

1311

}

1312

return 0;

1313

}

1314

if(debug){

1315

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

1316

direntry->d_name);

1317

}

1318

return 1;

1319

}

1320

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1322

int ret;

1323

struct timespec now;

1324

struct timespec waited_time;

1325

intmax_t block_time;

1326

1327

while(true){

1328

if(mc.current_server == NULL){

1329

if (debug){

1330

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

1331

" No timeout!\n");

1332

}

1333

ret = avahi_simple_poll_iterate(s, -1);

1334

} else {

1335

if (debug){

1336

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

1337

" it, or wait\n");

1338

}

1339

/* the current time */

1340

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1341

if(ret == -1){

1342

perror_plus("clock_gettime");

1343

return -1;

1344

}

1345

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

1346

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

1347

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1349

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1351

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

1352

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

1353

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

1354

block_time = ((retry_interval

1355

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

1356

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

1357

1358

if (debug){

1359

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

1360

block_time);

1361

}

1362

1363

if(block_time <= 0){

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1368

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1370

return 0;

1371

}

1372

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1374

if(ret == -1){

1375

perror_plus("clock_gettime");

1376

return -1;

1377

}

1378

mc.current_server = mc.current_server->next;

1379

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

1380

servers, but don't block */

1381

}

1382

1383

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

1384

}

1385

if(ret != 0){

1386

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

1387

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

1388

}

1389

}

1390

}

1391

}

1392

1393

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

1394

const float delay){

1395

struct dirent **direntries;

1396

struct dirent *direntry;

1397

int ret;

1398

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

1399

alphasort);

1400

if(numhooks == -1){

1401

perror_plus("scandir");

1402

} else {

1403

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

1404

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

1405

direntry = direntries[i];

1406

char *fullname = NULL;

1407

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

1408

if(ret < 0){

1409

perror_plus("asprintf");

1410

continue;

1411

}

1412

if(debug){

1413

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

1414

direntry->d_name);

1415

}

1416

pid_t hook_pid = fork();

1417

if(hook_pid == 0){

1418

/* Child */

1419

/* Raise privileges */

1420

errno = 0;

1421

ret = seteuid(0);

1422

if(ret == -1){

1423

perror_plus("seteuid");

1424

}

1425

/* Raise privileges even more */

1426

errno = 0;

1427

ret = setuid(0);

1428

if(ret == -1){

1429

perror_plus("setuid");

1430

}

1431

/* Set group */

1432

errno = 0;

1433

ret = setgid(0);

1434

if(ret == -1){

1435

perror_plus("setgid");

1436

}

1437

/* Reset supplementary groups */

1438

errno = 0;

1439

ret = setgroups(0, NULL);

1440

if(ret == -1){

1441

perror_plus("setgroups");

1442

}

1443

dup2(devnull, STDIN_FILENO);

1444

close(devnull);

1445

dup2(STDERR_FILENO, STDOUT_FILENO);

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

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

1462

if(ret == -1){

1463

perror_plus("setenv");

1464

_exit(EX_OSERR);

1465

}

1466

char *delaystring;

1467

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

1468

if(ret == -1){

1469

perror_plus("asprintf");

1470

_exit(EX_OSERR);

1471

}

1472

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

1473

if(ret == -1){

1474

free(delaystring);

1475

perror_plus("setenv");

1476

_exit(EX_OSERR);

1477

}

1478

free(delaystring);

1479

if(connect_to != NULL){

1480

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

1481

if(ret == -1){

1482

perror_plus("setenv");

1483

_exit(EX_OSERR);

1484

}

1485

}

1486

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

1487

perror_plus("execl");

1488

_exit(EXIT_FAILURE);

1489

}

1490

} else {

1491

int status;

1492

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

1493

perror_plus("waitpid");

1494

free(fullname);

1495

continue;

1496

}

1497

if(WIFEXITED(status)){

1498

if(WEXITSTATUS(status) != 0){

1499

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

1500

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

1501

WEXITSTATUS(status));

1502

free(fullname);

1503

continue;

1504

}

1505

} else if(WIFSIGNALED(status)){

1506

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

1507

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

1508

WTERMSIG(status));

1509

free(fullname);

1510

continue;

1511

} else {

1512

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

1513

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

1514

free(fullname);

1515

continue;

1516

}

1517

}

1518

free(fullname);

1519

if(debug){

1520

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

1521

direntry->d_name);

1522

}

1523

}

1524

close(devnull);

1525

}

1526

return true;

1120

1527

}

1121

1528

1122

1529

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

1141

1548

bool gnutls_initialized = false;

1142

1549

bool gpgme_initialized = false;

1143

1550

float delay = 2.5f;

1551

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

1552

retrying the same server again */

1144

1553

1145

1554

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

1555

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1152

1561

errno = 0;

1153

1562

ret = setgid(gid);

1154

1563

if(ret == -1){

1155

perror("setgid");

1564

perror_plus("setgid");

1156

1565

}

1157

1566

1158

1567

/* Lower user privileges (temporarily) */

1159

1568

errno = 0;

1160

1569

ret = seteuid(uid);

1161

1570

if(ret == -1){

1162

perror("seteuid");

1571

perror_plus("seteuid");

1163

1572

}

1164

1573

1165

1574

if(quit_now){

1200

1609

.arg = "SECONDS",

1201

1610

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

1202

1611

.group = 2 },

1612

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

1613

.arg = "SECONDS",

1614

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

1615

.group = 2 },

1616

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

1617

.arg = "DIR",

1618

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

1619

.group = 2 },

1203

1620

/*

1204

1621

* These reproduce what we would get without ARGP_NO_HELP

1205

1622

*/

1249

1666

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

1250

1667

argp_error(state, "Bad delay");

1251

1668

}

1669

case 132: /* --retry */

1670

errno = 0;

1671

retry_interval = strtod(arg, &tmp);

1672

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

1673

or (retry_interval * 1000) > INT_MAX

1674

or retry_interval < 0){

1675

argp_error(state, "Bad retry interval");

1676

}

1677

break;

1678

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

1679

hookdir = arg;

1252

1680

break;

1253

1681

/*

1254

1682

* These reproduce what we would get without ARGP_NO_HELP

1261

1689

argp_state_help(state, state->out_stream,

1262

1690

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

1691

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

1264

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

1692

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

1265

1693

exit(argp_err_exit_status);

1266

1694

break;

1267

1695

default:

1282

1710

case ENOMEM:

1283

1711

default:

1284

1712

errno = ret;

1285

perror("argp_parse");

1713

perror_plus("argp_parse");

1286

1714

exitcode = EX_OSERR;

1287

1715

goto end;

1288

1716

case EINVAL:

1290

1718

goto end;

1291

1719

}

1292

1720

}

1721

1722

{

1723

/* Work around Debian bug #633582:

1724

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

1725

1726

/* Re-raise priviliges */

1727

errno = 0;

1728

ret = seteuid(0);

1729

if(ret == -1){

1730

perror_plus("seteuid");

1731

} else {

1732

struct stat st;

1733

1734

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

1735

int seckey_fd = open(seckey, O_RDONLY);

1736

if(seckey_fd == -1){

1737

perror_plus("open");

1738

} else {

1739

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

1740

if(ret == -1){

1741

perror_plus("fstat");

1742

} else {

1743

if(S_ISREG(st.st_mode)

1744

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

1745

ret = fchown(seckey_fd, uid, gid);

1746

if(ret == -1){

1747

perror_plus("fchown");

1748

}

1749

}

1750

}

1751

TEMP_FAILURE_RETRY(close(seckey_fd));

1752

}

1753

}

1754

1755

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

1756

int pubkey_fd = open(pubkey, O_RDONLY);

1757

if(pubkey_fd == -1){

1758

perror_plus("open");

1759

} else {

1760

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

1761

if(ret == -1){

1762

perror_plus("fstat");

1763

} else {

1764

if(S_ISREG(st.st_mode)

1765

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

1766

ret = fchown(pubkey_fd, uid, gid);

1767

if(ret == -1){

1768

perror_plus("fchown");

1769

}

1770

}

1771

}

1772

TEMP_FAILURE_RETRY(close(pubkey_fd));

1773

}

1774

}

1775

1776

/* Lower privileges */

1777

errno = 0;

1778

ret = seteuid(uid);

1779

if(ret == -1){

1780

perror_plus("seteuid");

1781

}

1782

}

1783

}

1784

1785

/* Run network hooks */

1786

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

1787

goto end;

1788

}

1293

1789

1294

1790

if(not debug){

1295

1791

avahi_set_log_function(empty_log);

1296

1792

}

1297

1793

1298

1794

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

1299

1795

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1796

/* First look for interfaces that are up */

1797

ret = scandir(sys_class_net, &direntries, up_interface,

1301

1798

alphasort);

1799

if(ret == 0){

1800

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

1801

free(direntries);

1802

ret = scandir(sys_class_net, &direntries, good_interface,

1803

alphasort);

1804

}

1302

1805

if(ret >= 1){

1303

/* Pick the first good interface */

1806

/* Pick the first interface returned */

1304

1807

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

1305

1808

if(debug){

1306

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

1809

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

1307

1810

}

1308

1811

if(interface == NULL){

1309

perror("malloc");

1812

perror_plus("malloc");

1310

1813

free(direntries);

1311

1814

exitcode = EXIT_FAILURE;

1312

1815

goto end;

1314

1817

free(direntries);

1315

1818

} else {

1316

1819

free(direntries);

1317

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

1820

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

1318

1821

exitcode = EXIT_FAILURE;

1319

1822

goto end;

1320

1823

}

1326

1829

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

1327

1830

mc.simple_poll = avahi_simple_poll_new();

1328

1831

if(mc.simple_poll == NULL){

1329

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

1832

fprintf_plus(stderr,

1833

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

1330

1834

exitcode = EX_UNAVAILABLE;

1331

1835

goto end;

1332

1836

}

1334

1838

sigemptyset(&sigterm_action.sa_mask);

1335

1839

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

1336

1840

if(ret == -1){

1337

perror("sigaddset");

1841

perror_plus("sigaddset");

1338

1842

exitcode = EX_OSERR;

1339

1843

goto end;

1340

1844

}

1341

1845

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

1342

1846

if(ret == -1){

1343

perror("sigaddset");

1847

perror_plus("sigaddset");

1344

1848

exitcode = EX_OSERR;

1345

1849

goto end;

1346

1850

}

1347

1851

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

1348

1852

if(ret == -1){

1349

perror("sigaddset");

1853

perror_plus("sigaddset");

1350

1854

exitcode = EX_OSERR;

1351

1855

goto end;

1352

1856

}

1356

1860

*/

1357

1861

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

1358

1862

if(ret == -1){

1359

perror("sigaction");

1863

perror_plus("sigaction");

1360

1864

return EX_OSERR;

1361

1865

}

1362

1866

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

1867

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

1364

1868

if(ret == -1){

1365

perror("sigaction");

1869

perror_plus("sigaction");

1366

1870

exitcode = EX_OSERR;

1367

1871

goto end;

1368

1872

}

1369

1873

}

1370

1874

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

1371

1875

if(ret == -1){

1372

perror("sigaction");

1876

perror_plus("sigaction");

1373

1877

return EX_OSERR;

1374

1878

}

1375

1879

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

1880

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

1377

1881

if(ret == -1){

1378

perror("sigaction");

1882

perror_plus("sigaction");

1379

1883

exitcode = EX_OSERR;

1380

1884

goto end;

1381

1885

}

1382

1886

}

1383

1887

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

1384

1888

if(ret == -1){

1385

perror("sigaction");

1889

perror_plus("sigaction");

1386

1890

return EX_OSERR;

1387

1891

}

1388

1892

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

1893

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

1390

1894

if(ret == -1){

1391

perror("sigaction");

1895

perror_plus("sigaction");

1392

1896

exitcode = EX_OSERR;

1393

1897

goto end;

1394

1898

}

1398

1902

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

1399

1903

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

1904

if(if_index == 0){

1401

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

1905

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

1402

1906

exitcode = EX_UNAVAILABLE;

1403

1907

goto end;

1404

1908

}

1411

1915

errno = 0;

1412

1916

ret = seteuid(0);

1413

1917

if(ret == -1){

1414

perror("seteuid");

1918

perror_plus("seteuid");

1415

1919

}

1416

1920

1417

1921

#ifdef __linux__

1421

1925

bool restore_loglevel = true;

1422

1926

if(ret == -1){

1423

1927

restore_loglevel = false;

1424

perror("klogctl");

1928

perror_plus("klogctl");

1425

1929

}

1426

1930

#endif /* __linux__ */

1427

1931

1428

1932

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

1933

if(sd < 0){

1430

perror("socket");

1934

perror_plus("socket");

1431

1935

exitcode = EX_OSERR;

1432

1936

#ifdef __linux__

1433

1937

if(restore_loglevel){

1434

1938

ret = klogctl(7, NULL, 0);

1435

1939

if(ret == -1){

1436

perror("klogctl");

1940

perror_plus("klogctl");

1437

1941

}

1438

1942

}

1439

1943

#endif /* __linux__ */

1441

1945

errno = 0;

1442

1946

ret = seteuid(uid);

1443

1947

if(ret == -1){

1444

perror("seteuid");

1948

perror_plus("seteuid");

1445

1949

}

1446

1950

goto end;

1447

1951

}

1448

1952

strcpy(network.ifr_name, interface);

1449

1953

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

1450

1954

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1955

perror_plus("ioctl SIOCGIFFLAGS");

1452

1956

#ifdef __linux__

1453

1957

if(restore_loglevel){

1454

1958

ret = klogctl(7, NULL, 0);

1455

1959

if(ret == -1){

1456

perror("klogctl");

1960

perror_plus("klogctl");

1457

1961

}

1458

1962

}

1459

1963

#endif /* __linux__ */

1462

1966

errno = 0;

1463

1967

ret = seteuid(uid);

1464

1968

if(ret == -1){

1465

perror("seteuid");

1969

perror_plus("seteuid");

1466

1970

}

1467

1971

goto end;

1468

1972

}

1472

1976

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

1473

1977

if(ret == -1){

1474

1978

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1979

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1476

1980

exitcode = EX_OSERR;

1477

1981

#ifdef __linux__

1478

1982

if(restore_loglevel){

1479

1983

ret = klogctl(7, NULL, 0);

1480

1984

if(ret == -1){

1481

perror("klogctl");

1985

perror_plus("klogctl");

1482

1986

}

1483

1987

}

1484

1988

#endif /* __linux__ */

1486

1990

errno = 0;

1487

1991

ret = seteuid(uid);

1488

1992

if(ret == -1){

1489

perror("seteuid");

1993

perror_plus("seteuid");

1490

1994

}

1491

1995

goto end;

1492

1996

}

1493

1997

}

1494

/* sleep checking until interface is running */

1998

/* Sleep checking until interface is running.

1999

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

1495

2000

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

1496

2001

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

1497

2002

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

2003

perror_plus("ioctl SIOCGIFFLAGS");

1499

2004

} else if(network.ifr_flags & IFF_RUNNING){

1500

2005

break;

1501

2006

}

1502

2007

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

2008

ret = nanosleep(&sleeptime, NULL);

1504

2009

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

1505

perror("nanosleep");

2010

perror_plus("nanosleep");

1506

2011

}

1507

2012

}

1508

2013

if(not take_down_interface){

1509

2014

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

1510

2015

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

1511

2016

if(ret == -1){

1512

perror("close");

2017

perror_plus("close");

1513

2018

}

1514

2019

}

1515

2020

#ifdef __linux__

1517

2022

/* Restores kernel loglevel to default */

1518

2023

ret = klogctl(7, NULL, 0);

1519

2024

if(ret == -1){

1520

perror("klogctl");

2025

perror_plus("klogctl");

1521

2026

}

1522

2027

}

1523

2028

#endif /* __linux__ */

1524

2029

/* Lower privileges */

1525

2030

errno = 0;

1526

if(take_down_interface){

1527

/* Lower privileges */

1528

ret = seteuid(uid);

1529

if(ret == -1){

1530

perror("seteuid");

1531

}

1532

} else {

1533

/* Lower privileges permanently */

1534

ret = setuid(uid);

1535

if(ret == -1){

1536

perror("setuid");

1537

}

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

1538

2035

}

1539

2036

}

1540

2037

1544

2041

1545

2042

ret = init_gnutls_global(pubkey, seckey);

1546

2043

if(ret == -1){

1547

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

2044

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

1548

2045

exitcode = EX_UNAVAILABLE;

1549

2046

goto end;

1550

2047

} else {

1555

2052

goto end;

1556

2053

}

1557

2054

2055

if(mkdtemp(tempdir) == NULL){

2056

perror_plus("mkdtemp");

2057

goto end;

2058

}

1558

2059

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

1562

goto end;

1563

}

1564

2060

1565

2061

if(quit_now){

1566

2062

goto end;

1567

2063

}

1568

2064

1569

2065

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

1570

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

2066

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

1571

2067

exitcode = EX_UNAVAILABLE;

1572

2068

goto end;

1573

2069

} else {

1583

2079

/* (Mainly meant for debugging) */

1584

2080

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

1585

2081

if(address == NULL){

1586

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

2082

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

1587

2083

exitcode = EX_USAGE;

1588

2084

goto end;

1589

2085

}

1597

2093

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

1598

2094

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

1599

2095

or tmpmax != (uint16_t)tmpmax){

1600

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

2096

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

1601

2097

exitcode = EX_USAGE;

1602

2098

goto end;

1603

2099

}

1608

2104

1609

2105

port = (uint16_t)tmpmax;

1610

2106

*address = '\0';

1611

address = connect_to;

1612

2107

/* Colon in address indicates IPv6 */

1613

2108

int af;

1614

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

2109

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

1615

2110

af = AF_INET6;

2111

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

2112

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

2113

{

2114

connect_to++;

2115

address[-1] = '\0';

2116

}

1616

2117

} else {

1617

2118

af = AF_INET;

1618

2119

}

2120

address = connect_to;

1619

2121

1620

2122

if(quit_now){

1621

2123

goto end;

1622

2124

}

1623

2125

1624

2126

while(not quit_now){

1625

2127

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

1626

2128

if(quit_now or ret == 0){

1627

2129

break;

1628

2130

}

1629

sleep(15);

1630

};

1631

2131

if(debug){

2132

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

2133

(int)retry_interval);

2134

}

2135

sleep((int)retry_interval);

2136

}

2137

1632

2138

if (not quit_now){

1633

2139

exitcode = EXIT_SUCCESS;

1634

2140

}

1635

2141

1636

2142

goto end;

1637

2143

}

1638

2144

1660

2166

1661

2167

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

1662

2168

if(mc.server == NULL){

1663

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

1664

avahi_strerror(error));

2169

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

2170

avahi_strerror(error));

1665

2171

exitcode = EX_UNAVAILABLE;

1666

2172

goto end;

1667

2173

}

1675

2181

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1676

2182

NULL, 0, browse_callback, NULL);

1677

2183

if(sb == NULL){

1678

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

1679

avahi_strerror(avahi_server_errno(mc.server)));

2184

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

2185

avahi_strerror(avahi_server_errno(mc.server)));

1680

2186

exitcode = EX_UNAVAILABLE;

1681

2187

goto end;

1682

2188

}

1688

2194

/* Run the main loop */

1689

2195

1690

2196

if(debug){

1691

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

1692

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2197

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

2198

}

2199

2200

ret = avahi_loop_with_timeout(mc.simple_poll,

2201

(int)(retry_interval * 1000));

2202

if(debug){

2203

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

2204

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

2205

}

1695

2206

1696

2207

end:

1697

2208

1698

2209

if(debug){

1699

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

2210

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

1700

2211

}

1701

2212

1702

2213

/* Cleanup things */

1719

2230

gpgme_release(mc.ctx);

1720

2231

}

1721

2232

1722

/* Take down the network interface */

1723

if(take_down_interface){

1724

/* Re-raise priviliges */

2233

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

2234

has seen */

2235

if(mc.current_server != NULL){

2236

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

2237

while(mc.current_server != NULL){

2238

server *next = mc.current_server->next;

2239

free(mc.current_server);

2240

mc.current_server = next;

2241

}

2242

}

2243

2244

/* Run network hooks */

2245

run_network_hooks("stop", interface, delay);

2246

2247

/* Re-raise priviliges */

2248

{

1725

2249

errno = 0;

1726

2250

ret = seteuid(0);

1727

2251

if(ret == -1){

1728

perror("seteuid");

2252

perror_plus("seteuid");

1729

2253

}

1730

if(geteuid() == 0){

2254

2255

/* Take down the network interface */

2256

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

1731

2257

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

1732

2258

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

2259

perror_plus("ioctl SIOCGIFFLAGS");

2260

} else if(network.ifr_flags & IFF_UP){

1735

2261

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

1736

2262

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

1737

2263

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2264

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1739

2265

}

1740

2266

}

1741

2267

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

1742

2268

if(ret == -1){

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

2269

perror_plus("close");

1750

2270

}

1751

2271

}

1752

2272

}

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

1753

2279

1754

/* Removes the temp directory used by GPGME */

2280

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

1755

2281

if(tempdir_created){

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

1763

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

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

1770

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

1771

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

1772

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

1773

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

1774

continue;

1775

}

2282

struct dirent **direntries = NULL;

2283

struct dirent *direntry = NULL;

2284

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

2285

alphasort);

2286

if (numentries > 0){

2287

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

2288

direntry = direntries[i];

1776

2289

char *fullname = NULL;

1777

2290

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

1778

2291

direntry->d_name);

1779

2292

if(ret < 0){

1780

perror("asprintf");

2293

perror_plus("asprintf");

1781

2294

continue;

1782

2295

}

1783

2296

ret = remove(fullname);

1784

2297

if(ret == -1){

1785

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

1786

strerror(errno));

2298

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

2299

strerror(errno));

1787

2300

}

1788

2301

free(fullname);

1789

2302

}

1790

closedir(d);

2303

}

2304

2305

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

2306

free(direntries);

2307

if (numentries == -1){

2308

perror_plus("scandir");

1791

2309

}

1792

2310

ret = rmdir(tempdir);

1793

2311

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

1794

perror("rmdir");

2312

perror_plus("rmdir");

1795

2313

}

1796

2314

}

1797

2315

1802

2320

&old_sigterm_action,

1803

2321

NULL));

1804

2322

if(ret == -1){

1805

perror("sigaction");

2323

perror_plus("sigaction");

1806

2324

}

1807

2325

do {

1808

2326

ret = raise(signal_received);

1809

2327

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

1810

2328

if(ret != 0){

1811

perror("raise");

2329

perror_plus("raise");

1812

2330

abort();

1813

2331

}

1814

2332

TEMP_FAILURE_RETRY(pause());