/mandos/trunk : revision 237.2.33

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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@recompile.se>.

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

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*/

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32

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

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stdout, ferror(), remove() */

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

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

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

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strtof(), abort() */

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

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srand(), strtof(), abort() */

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#include <stdbool.h> /* bool, false, true */

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#include <string.h> /* memset(), strcmp(), strlen(),

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strerror(), asprintf(), strcpy() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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

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

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

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SIOCSIFFLAGS, if_indextoname(),

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69

if_nametoindex(), IF_NAMESIZE */

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72

*/

74

73

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

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74

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

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

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

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setgid(), pause() */

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

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77

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

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78

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

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argp_state, struct argp,

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82

#include <signal.h> /* sigemptyset(), sigaddset(),

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sigaction(), SIGTERM, sig_atomic_t,

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84

raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

89

WEXITSTATUS(), WTERMSIG() */

90

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

91

85

92

86

#ifdef __linux__

93

87

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

111

105

init_gnutls_session(),

112

106

GNUTLS_* */

113

107

#include <gnutls/openpgp.h>

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

108

/* gnutls_certificate_set_openpgp_key_file(),

109

GNUTLS_OPENPGP_FMT_BASE64 */

116

110

117

111

/* GPGME */

118

112

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

126

120

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

127

121

#define SECKEY "seckey.txt"

128

122

#define PUBKEY "pubkey.txt"

129

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

130

123

131

124

bool debug = false;

132

125

static const char mandos_protocol_version[] = "1";

133

126

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

134

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

127

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

135

128

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

136

129

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;

149

130

150

131

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

151

132

typedef struct {

156

137

gnutls_dh_params_t dh_params;

157

138

const char *priority;

158

139

gpgme_ctx_t ctx;

159

server *current_server;

160

140

} mandos_context;

161

141

162

142

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

163

143

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

164

144

.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

145

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

167

146

168

147

sig_atomic_t quit_now = 0;

169

148

int signal_received = 0;

170

149

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: ",

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program_invocation_short_name);

176

errno = e;

177

perror(print_text);

178

}

179

180

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

181

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

182

va_list ap;

183

va_start (ap, format);

184

185

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

186

program_invocation_short_name));

187

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

188

}

189

190

150

/*

191

151

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

192

152

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

193

153

* "buffer_length" is how much is already used.

194

154

*/

195

155

size_t incbuffer(char **buffer, size_t buffer_length,

196

size_t buffer_capacity){

156

size_t buffer_capacity){

197

157

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

158

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

199

159

if(buffer == NULL){

204

164

return buffer_capacity;

205

165

}

206

166

207

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

208

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

209

int af){

210

int ret;

211

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

212

if(new_server == NULL){

213

perror_plus("malloc");

214

return false;

215

}

216

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

217

.port = port,

218

.if_index = if_index,

219

.af = af };

220

if(new_server->ip == NULL){

221

perror_plus("strdup");

222

return false;

223

}

224

/* Special case of first server */

225

if (mc.current_server == NULL){

226

new_server->next = new_server;

227

new_server->prev = new_server;

228

mc.current_server = new_server;

229

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

230

} else {

231

new_server->next = mc.current_server;

232

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

233

new_server->prev->next = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

240

}

241

return true;

242

}

243

244

167

/*

245

168

* Initialize GPGME.

246

169

*/

247

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

248

const char *tempdir){

170

static bool init_gpgme(const char *seckey,

171

const char *pubkey, const char *tempdir){

249

172

gpgme_error_t rc;

250

173

gpgme_engine_info_t engine_info;

251

174

260

183

261

184

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

262

185

if(fd == -1){

263

perror_plus("open");

186

perror("open");

264

187

return false;

265

188

}

266

189

267

190

rc = gpgme_data_new_from_fd(&pgp_data, fd);

268

191

if(rc != GPG_ERR_NO_ERROR){

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

192

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

193

gpgme_strsource(rc), gpgme_strerror(rc));

271

194

return false;

272

195

}

273

196

274

197

rc = gpgme_op_import(mc.ctx, pgp_data);

275

198

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

199

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

200

gpgme_strsource(rc), gpgme_strerror(rc));

278

201

return false;

279

202

}

280

203

281

204

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

282

205

if(ret == -1){

283

perror_plus("close");

206

perror("close");

284

207

}

285

208

gpgme_data_release(pgp_data);

286

209

return true;

287

210

}

288

211

289

212

if(debug){

290

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

213

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

291

214

}

292

215

293

216

/* Init GPGME */

294

217

gpgme_check_version(NULL);

295

218

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

296

219

if(rc != GPG_ERR_NO_ERROR){

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

220

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

221

gpgme_strsource(rc), gpgme_strerror(rc));

299

222

return false;

300

223

}

301

224

302

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

225

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

303

226

rc = gpgme_get_engine_info(&engine_info);

304

227

if(rc != GPG_ERR_NO_ERROR){

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

228

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

229

gpgme_strsource(rc), gpgme_strerror(rc));

307

230

return false;

308

231

}

309

232

while(engine_info != NULL){

315

238

engine_info = engine_info->next;

316

239

}

317

240

if(engine_info == NULL){

318

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

319

tempdir);

241

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

320

242

return false;

321

243

}

322

244

323

245

/* Create new GPGME "context" */

324

246

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

325

247

if(rc != GPG_ERR_NO_ERROR){

326

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

327

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

328

gpgme_strerror(rc));

248

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

249

gpgme_strsource(rc), gpgme_strerror(rc));

329

250

return false;

330

251

}

331

252

350

271

ssize_t plaintext_length = 0;

351

272

352

273

if(debug){

353

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

274

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

354

275

}

355

276

356

277

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

357

278

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

358

279

0);

359

280

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

362

283

return -1;

363

284

}

364

285

365

286

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

366

287

rc = gpgme_data_new(&dh_plain);

367

288

if(rc != GPG_ERR_NO_ERROR){

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

371

291

gpgme_data_release(dh_crypto);

372

292

return -1;

373

293

}

376

296

data buffer */

377

297

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

378

298

if(rc != GPG_ERR_NO_ERROR){

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

381

301

plaintext_length = -1;

382

302

if(debug){

383

303

gpgme_decrypt_result_t result;

384

304

result = gpgme_op_decrypt_result(mc.ctx);

385

305

if(result == NULL){

386

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

306

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

387

307

} else {

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

308

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

309

result->unsupported_algorithm);

310

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

311

result->wrong_key_usage);

392

312

if(result->file_name != NULL){

393

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

313

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

394

314

}

395

315

gpgme_recipient_t recipient;

396

316

recipient = result->recipients;

397

317

while(recipient != NULL){

398

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

399

gpgme_pubkey_algo_name

400

(recipient->pubkey_algo));

401

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

402

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

403

recipient->status == GPG_ERR_NO_SECKEY

404

? "No" : "Yes");

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

405

324

recipient = recipient->next;

406

325

}

407

326

}

410

329

}

411

330

412

331

if(debug){

413

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

332

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

414

333

}

415

334

416

335

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

417

336

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

418

perror_plus("gpgme_data_seek");

337

perror("gpgme_data_seek");

419

338

plaintext_length = -1;

420

339

goto decrypt_end;

421

340

}

423

342

*plaintext = NULL;

424

343

while(true){

425

344

plaintext_capacity = incbuffer(plaintext,

426

(size_t)plaintext_length,

427

plaintext_capacity);

345

(size_t)plaintext_length,

346

plaintext_capacity);

428

347

if(plaintext_capacity == 0){

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

348

perror("incbuffer");

349

plaintext_length = -1;

350

goto decrypt_end;

432

351

}

433

352

434

353

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

439

358

break;

440

359

}

441

360

if(ret < 0){

442

perror_plus("gpgme_data_read");

361

perror("gpgme_data_read");

443

362

plaintext_length = -1;

444

363

goto decrypt_end;

445

364

}

447

366

}

448

367

449

368

if(debug){

450

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

369

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

451

370

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

452

371

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

453

372

}

475

394

/* GnuTLS log function callback */

476

395

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

477

396

const char* string){

478

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

397

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

479

398

}

480

399

481

400

static int init_gnutls_global(const char *pubkeyfilename,

483

402

int ret;

484

403

485

404

if(debug){

486

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

405

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

487

406

}

488

407

489

408

ret = gnutls_global_init();

490

409

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

410

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

411

safer_gnutls_strerror(ret));

493

412

return -1;

494

413

}

495

414

502

421

}

503

422

504

423

/* OpenPGP credentials */

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

424

gnutls_certificate_allocate_credentials(&mc.cred);

506

425

if(ret != GNUTLS_E_SUCCESS){

507

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

508

safer_gnutls_strerror(ret));

426

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

427

from

428

-Wunreachable-code

429

*/

430

safer_gnutls_strerror(ret));

509

431

gnutls_global_deinit();

510

432

return -1;

511

433

}

512

434

513

435

if(debug){

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

436

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

437

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

438

seckeyfilename);

518

439

}

519

440

520

441

ret = gnutls_certificate_set_openpgp_key_file

521

442

(mc.cred, pubkeyfilename, seckeyfilename,

522

443

GNUTLS_OPENPGP_FMT_BASE64);

523

444

if(ret != GNUTLS_E_SUCCESS){

524

fprintf_plus(stderr,

525

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

526

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

527

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

528

safer_gnutls_strerror(ret));

445

fprintf(stderr,

446

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

447

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

448

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

449

safer_gnutls_strerror(ret));

529

450

goto globalfail;

530

451

}

531

452

532

453

/* GnuTLS server initialization */

533

454

ret = gnutls_dh_params_init(&mc.dh_params);

534

455

if(ret != GNUTLS_E_SUCCESS){

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

456

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

457

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

538

458

goto globalfail;

539

459

}

540

460

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

541

461

if(ret != GNUTLS_E_SUCCESS){

542

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

543

safer_gnutls_strerror(ret));

462

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

463

safer_gnutls_strerror(ret));

544

464

goto globalfail;

545

465

}

546

466

566

486

}

567

487

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

568

488

if(ret != GNUTLS_E_SUCCESS){

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

489

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

490

safer_gnutls_strerror(ret));

572

491

}

573

492

574

493

{

581

500

}

582

501

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

583

502

if(ret != GNUTLS_E_SUCCESS){

584

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

585

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

586

safer_gnutls_strerror(ret));

503

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

504

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

505

safer_gnutls_strerror(ret));

587

506

gnutls_deinit(*session);

588

507

return -1;

589

508

}

598

517

}

599

518

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

600

519

if(ret != GNUTLS_E_SUCCESS){

601

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

602

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

603

522

gnutls_deinit(*session);

604

523

return -1;

605

524

}

635

554

gnutls_session_t session;

636

555

int pf; /* Protocol family */

637

556

638

errno = 0;

639

640

557

if(quit_now){

641

errno = EINTR;

642

558

return -1;

643

559

}

644

560

650

566

pf = PF_INET;

651

567

break;

652

568

default:

653

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

654

errno = EINVAL;

569

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

655

570

return -1;

656

571

}

657

572

661

576

}

662

577

663

578

if(debug){

664

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

665

PRIu16 "\n", ip, port);

579

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

580

"\n", ip, port);

666

581

}

667

582

668

583

tcp_sd = socket(pf, SOCK_STREAM, 0);

669

584

if(tcp_sd < 0){

670

int e = errno;

671

perror_plus("socket");

672

errno = e;

585

perror("socket");

673

586

goto mandos_end;

674

587

}

675

588

676

589

if(quit_now){

677

errno = EINTR;

678

590

goto mandos_end;

679

591

}

680

592

687

599

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

688

600

}

689

601

if(ret < 0 ){

690

int e = errno;

691

perror_plus("inet_pton");

692

errno = e;

602

perror("inet_pton");

693

603

goto mandos_end;

694

604

}

695

605

if(ret == 0){

696

int e = errno;

697

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

698

errno = e;

606

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

699

607

goto mandos_end;

700

608

}

701

609

if(af == AF_INET6){

705

613

706

614

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

615

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

708

-Wunreachable-code*/

616

-Wunreachable-code*/

709

617

if(if_index == AVAHI_IF_UNSPEC){

710

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

711

" incomplete without a network interface\n");

712

errno = EINVAL;

618

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

619

" without a network interface\n");

713

620

goto mandos_end;

714

621

}

715

622

/* Set the network interface number as scope */

722

629

}

723

630

724

631

if(quit_now){

725

errno = EINTR;

726

632

goto mandos_end;

727

633

}

728

634

730

636

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

731

637

char interface[IF_NAMESIZE];

732

638

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

733

perror_plus("if_indextoname");

639

perror("if_indextoname");

734

640

} else {

735

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

736

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

641

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

642

ip, interface, port);

737

643

}

738

644

} else {

739

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

740

ip, port);

645

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

646

port);

741

647

}

742

648

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

649

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

656

sizeof(addrstr));

751

657

}

752

658

if(pcret == NULL){

753

perror_plus("inet_ntop");

659

perror("inet_ntop");

754

660

} else {

755

661

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

756

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

662

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

757

663

}

758

664

}

759

665

}

760

666

761

667

if(quit_now){

762

errno = EINTR;

763

668

goto mandos_end;

764

669

}

765

670

769

674

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

770

675

}

771

676

if(ret < 0){

772

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

773

int e = errno;

774

perror_plus("connect");

775

errno = e;

776

}

677

perror("connect");

777

678

goto mandos_end;

778

679

}

779

680

780

681

if(quit_now){

781

errno = EINTR;

782

682

goto mandos_end;

783

683

}

784

684

787

687

while(true){

788

688

size_t out_size = strlen(out);

789

689

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

790

out_size - written));

690

out_size - written));

791

691

if(ret == -1){

792

int e = errno;

793

perror_plus("write");

794

errno = e;

692

perror("write");

795

693

goto mandos_end;

796

694

}

797

695

written += (size_t)ret;

807

705

}

808

706

809

707

if(quit_now){

810

errno = EINTR;

811

708

goto mandos_end;

812

709

}

813

710

}

814

711

815

712

if(debug){

816

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

713

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

817

714

}

818

715

819

716

if(quit_now){

820

errno = EINTR;

821

717

goto mandos_end;

822

718

}

823

719

824

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

825

720

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

826

721

827

722

if(quit_now){

828

errno = EINTR;

829

723

goto mandos_end;

830

724

}

831

725

832

726

do {

833

727

ret = gnutls_handshake(session);

834

728

if(quit_now){

835

errno = EINTR;

836

729

goto mandos_end;

837

730

}

838

731

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

839

732

840

733

if(ret != GNUTLS_E_SUCCESS){

841

734

if(debug){

842

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

735

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

843

736

gnutls_perror(ret);

844

737

}

845

errno = EPROTO;

846

738

goto mandos_end;

847

739

}

848

740

849

741

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

850

742

851

743

if(debug){

852

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

853

" %s\n", ip);

744

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

745

ip);

854

746

}

855

747

856

748

while(true){

857

749

858

750

if(quit_now){

859

errno = EINTR;

860

751

goto mandos_end;

861

752

}

862

753

863

754

buffer_capacity = incbuffer(&buffer, buffer_length,

864

buffer_capacity);

755

buffer_capacity);

865

756

if(buffer_capacity == 0){

866

int e = errno;

867

perror_plus("incbuffer");

868

errno = e;

757

perror("incbuffer");

869

758

goto mandos_end;

870

759

}

871

760

872

761

if(quit_now){

873

errno = EINTR;

874

762

goto mandos_end;

875

763

}

876

764

889

777

ret = gnutls_handshake(session);

890

778

891

779

if(quit_now){

892

errno = EINTR;

893

780

goto mandos_end;

894

781

}

895

782

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

896

783

if(ret < 0){

897

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

898

"***\n");

784

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

899

785

gnutls_perror(ret);

900

errno = EPROTO;

901

786

goto mandos_end;

902

787

}

903

788

break;

904

789

default:

905

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

906

" encrypted session with Mandos server\n");

790

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

791

" encrypted session with Mandos server\n");

907

792

gnutls_bye(session, GNUTLS_SHUT_RDWR);

908

errno = EIO;

909

793

goto mandos_end;

910

794

}

911

795

} else {

914

798

}

915

799

916

800

if(debug){

917

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

801

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

918

802

}

919

803

920

804

if(quit_now){

921

errno = EINTR;

922

805

goto mandos_end;

923

806

}

924

807

925

808

do {

926

809

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

927

810

if(quit_now){

928

errno = EINTR;

929

811

goto mandos_end;

930

812

}

931

813

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

932

814

933

815

if(buffer_length > 0){

934

816

ssize_t decrypted_buffer_size;

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

817

decrypted_buffer_size = pgp_packet_decrypt(buffer,

818

buffer_length,

936

819

&decrypted_buffer);

937

820

if(decrypted_buffer_size >= 0){

938

821

939

822

written = 0;

940

823

while(written < (size_t) decrypted_buffer_size){

941

824

if(quit_now){

942

errno = EINTR;

943

825

goto mandos_end;

944

826

}

945

827

947

829

(size_t)decrypted_buffer_size - written,

948

830

stdout);

949

831

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

950

int e = errno;

951

832

if(debug){

952

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

953

strerror(errno));

833

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

834

strerror(errno));

954

835

}

955

errno = e;

956

836

goto mandos_end;

957

837

}

958

838

written += (size_t)ret;

964

844

/* Shutdown procedure */

965

845

966

846

mandos_end:

967

{

968

int e = errno;

969

free(decrypted_buffer);

970

free(buffer);

971

if(tcp_sd >= 0){

972

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

973

}

974

if(ret == -1){

975

if(e == 0){

976

e = errno;

977

}

978

perror_plus("close");

979

}

980

gnutls_deinit(session);

981

errno = e;

982

if(quit_now){

983

errno = EINTR;

984

retval = -1;

985

}

847

free(decrypted_buffer);

848

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

852

if(ret == -1){

853

perror("close");

854

}

855

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

986

858

}

987

859

return retval;

988

860

}

1013

885

switch(event){

1014

886

default:

1015

887

case AVAHI_RESOLVER_FAILURE:

1016

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

1017

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

1018

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

888

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

889

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

890

avahi_strerror(avahi_server_errno(mc.server)));

1020

891

break;

1021

892

1022

893

case AVAHI_RESOLVER_FOUND:

1024

895

char ip[AVAHI_ADDRESS_STR_MAX];

1025

896

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

1026

897

if(debug){

1027

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

1028

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

1029

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

898

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

899

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

900

ip, (intmax_t)interface, port);

1030

901

}

1031

902

int ret = start_mandos_communication(ip, port, interface,

1032

903

avahi_proto_to_af(proto));

1033

904

if(ret == 0){

1034

905

avahi_simple_poll_quit(mc.simple_poll);

1035

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1038

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

1039

" list\n", name);

1040

}

1041

906

}

1042

907

}

1043

908

}

1067

932

default:

1068

933

case AVAHI_BROWSER_FAILURE:

1069

934

1070

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

935

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

936

avahi_strerror(avahi_server_errno(mc.server)));

1072

937

avahi_simple_poll_quit(mc.simple_poll);

1073

938

return;

1074

939

1081

946

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

1082

947

name, type, domain, protocol, 0,

1083

948

resolve_callback, NULL) == NULL)

1084

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

1085

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

949

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

950

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

1087

951

break;

1088

952

1089

953

case AVAHI_BROWSER_REMOVE:

1092

956

case AVAHI_BROWSER_ALL_FOR_NOW:

1093

957

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1094

958

if(debug){

1095

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

1096

" searching...\n");

959

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

1097

960

}

1098

961

break;

1099

962

}

1100

963

}

1101

964

1102

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

965

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

1103

966

static void handle_sigterm(int sig){

1104

967

if(quit_now){

1105

968

return;

1107

970

quit_now = 1;

1108

971

signal_received = sig;

1109

972

int old_errno = errno;

1110

/* set main loop to exit */

1111

973

if(mc.simple_poll != NULL){

1112

974

avahi_simple_poll_quit(mc.simple_poll);

1113

975

}

1114

976

errno = old_errno;

1115

977

}

1116

978

1117

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

1118

int ret;

1119

1120

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

1121

if(s < 0){

1122

perror_plus("socket");

1123

return false;

1124

}

1125

strcpy(ifr->ifr_name, ifname);

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

if(ret == -1){

1128

if(debug){

1129

perror_plus("ioctl SIOCGIFFLAGS");

1130

}

1131

return false;

1132

}

1133

return true;

1134

}

1135

1136

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

1137

979

/*

980

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

981

* corresponds to an acceptable network device.

982

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

983

*/

984

int good_interface(const struct dirent *if_entry){

985

ssize_t ssret;

986

char *flagname = NULL;

987

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

988

if_entry->d_name);

989

if(ret < 0){

990

perror("asprintf");

991

return 0;

992

}

993

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

994

return 0;

995

}

996

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

997

if(flags_fd == -1){

998

perror("open");

999

return 0;

1000

}

1001

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

1002

/* read line from flags_fd */

1003

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

1004

char *flagstring = malloc((size_t)to_read);

1005

if(flagstring == NULL){

1006

perror("malloc");

1007

close(flags_fd);

1008

return 0;

1009

}

1010

while(to_read > 0){

1011

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

1012

(size_t)to_read));

1013

if(ssret == -1){

1014

perror("read");

1015

free(flagstring);

1016

close(flags_fd);

1017

return 0;

1018

}

1019

to_read -= ssret;

1020

if(ssret == 0){

1021

break;

1022

}

1023

}

1024

close(flags_fd);

1025

intmax_t tmpmax;

1026

char *tmp;

1027

errno = 0;

1028

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

1029

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

1030

and not (isspace(*tmp)))

1031

or tmpmax != (ifreq_flags)tmpmax){

1032

free(flagstring);

1033

return 0;

1034

}

1035

free(flagstring);

1036

ifreq_flags flags = (ifreq_flags)tmpmax;

1138

1037

/* Reject the loopback device */

1139

if(ifr->ifr_flags & IFF_LOOPBACK){

1140

if(debug){

1141

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

1142

ifname);

1143

}

1144

return false;

1038

if(flags & IFF_LOOPBACK){

1039

return 0;

1145

1040

}

1146

1041

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

1147

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

1148

if(debug){

1149

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

1150

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

1151

}

1152

return true;

1042

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

1043

return 1;

1153

1044

}

1154

1045

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

1155

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

1156

if(debug){

1157

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1158

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

1159

}

1160

return false;

1161

}

1162

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

1163

if(ifr->ifr_flags & IFF_NOARP){

1164

if(debug){

1165

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

1166

ifname);

1167

}

1168

return false;

1169

}

1170

1046

if(not (flags & IFF_BROADCAST)){

1047

return 0;

1048

}

1171

1049

/* Accept this device */

1172

if(debug){

1173

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

1174

}

1175

return true;

1176

}

1177

1178

/*

1179

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

1180

* corresponds to an acceptable network device.

1181

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

1182

*/

1183

int good_interface(const struct dirent *if_entry){

1184

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

1185

return 0;

1186

}

1187

1188

struct ifreq ifr;

1189

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

1190

if(debug){

1191

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

1192

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

1193

}

1194

return 0;

1195

}

1196

1197

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

1198

return 0;

1199

}

1200

return 1;

1201

}

1202

1203

/*

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1244

}

1245

1246

int notdotentries(const struct dirent *direntry){

1247

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

1248

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

1249

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

1250

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

1251

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

1252

return 0;

1253

}

1254

return 1;

1255

}

1256

1257

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

1258

int runnable_hook(const struct dirent *direntry){

1259

int ret;

1260

size_t sret;

1261

struct stat st;

1262

1263

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

1264

/* Empty name? */

1265

return 0;

1266

}

1267

1268

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

1269

"abcdefghijklmnopqrstuvwxyz"

1270

"0123456789"

1271

"_-");

1272

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

1273

/* Contains non-allowed characters */

1274

if(debug){

1275

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

1276

direntry->d_name);

1277

}

1278

return 0;

1279

}

1280

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1289

if(ret == -1){

1290

if(debug){

1291

perror_plus("Could not stat hook");

1292

}

1293

return 0;

1294

}

1295

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

1296

/* Not a regular file */

1297

if(debug){

1298

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

1299

direntry->d_name);

1300

}

1301

return 0;

1302

}

1303

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

1304

/* Not executable */

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 0;

1310

}

1311

if(debug){

1312

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

1313

direntry->d_name);

1314

}

1315

return 1;

1316

}

1317

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1319

int ret;

1320

struct timespec now;

1321

struct timespec waited_time;

1322

intmax_t block_time;

1323

1324

while(true){

1325

if(mc.current_server == NULL){

1326

if (debug){

1327

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

1328

" No timeout!\n");

1329

}

1330

ret = avahi_simple_poll_iterate(s, -1);

1331

} else {

1332

if (debug){

1333

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

1334

" it, or wait\n");

1335

}

1336

/* the current time */

1337

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1338

if(ret == -1){

1339

perror_plus("clock_gettime");

1340

return -1;

1341

}

1342

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

1343

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

1344

waited_time.tv_sec = (now.tv_sec

1345

- mc.current_server->last_seen.tv_sec);

1346

waited_time.tv_nsec = (now.tv_nsec

1347

- mc.current_server->last_seen.tv_nsec);

1348

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

1349

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

1350

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

1351

block_time = ((retry_interval

1352

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

1353

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

1354

1355

if (debug){

1356

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

1357

block_time);

1358

}

1359

1360

if(block_time <= 0){

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

1365

if(ret == 0){

1366

avahi_simple_poll_quit(mc.simple_poll);

1367

return 0;

1368

}

1369

ret = clock_gettime(CLOCK_MONOTONIC,

1370

&mc.current_server->last_seen);

1371

if(ret == -1){

1372

perror_plus("clock_gettime");

1373

return -1;

1374

}

1375

mc.current_server = mc.current_server->next;

1376

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

1377

servers, but don't block */

1378

}

1379

1380

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

1381

}

1382

if(ret != 0){

1383

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

1384

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

1385

}

1386

}

1387

}

1388

}

1389

1390

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

1391

const float delay){

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1397

if(numhooks == -1){

1398

perror_plus("scandir");

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

1406

perror_plus("asprintf");

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

1475

free(delaystring);

1476

if(connect_to != NULL){

1477

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

1478

if(ret == -1){

1479

perror_plus("setenv");

1480

_exit(EX_OSERR);

1481

}

1482

}

1483

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

1484

perror_plus("execl");

1485

_exit(EXIT_FAILURE);

1486

}

1487

} else {

1488

int status;

1489

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

1490

perror_plus("waitpid");

1491

free(fullname);

1492

continue;

1493

}

1494

if(WIFEXITED(status)){

1495

if(WEXITSTATUS(status) != 0){

1496

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

1497

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

1498

WEXITSTATUS(status));

1499

free(fullname);

1500

continue;

1501

}

1502

} else if(WIFSIGNALED(status)){

1503

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

1504

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

1505

WTERMSIG(status));

1506

free(fullname);

1507

continue;

1508

} else {

1509

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

1510

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

1511

free(fullname);

1512

continue;

1513

}

1514

}

1515

free(fullname);

1516

if(debug){

1517

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

1518

direntry->d_name);

1519

}

1520

}

1521

close(devnull);

1522

}

1523

return true;

1050

return 1;

1524

1051

}

1525

1052

1526

1053

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

1545

1072

bool gnutls_initialized = false;

1546

1073

bool gpgme_initialized = false;

1547

1074

float delay = 2.5f;

1548

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

1549

retrying the same server again */

1550

1075

1551

1076

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1552

1077

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1558

1083

errno = 0;

1559

1084

ret = setgid(gid);

1560

1085

if(ret == -1){

1561

perror_plus("setgid");

1086

perror("setgid");

1562

1087

}

1563

1088

1564

1089

/* Lower user privileges (temporarily) */

1565

1090

errno = 0;

1566

1091

ret = seteuid(uid);

1567

1092

if(ret == -1){

1568

perror_plus("seteuid");

1093

perror("seteuid");

1569

1094

}

1570

1095

1571

1096

if(quit_now){

1606

1131

.arg = "SECONDS",

1607

1132

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

1608

1133

.group = 2 },

1609

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

1610

.arg = "SECONDS",

1611

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

1612

.group = 2 },

1613

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

1614

.arg = "DIR",

1615

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

1616

.group = 2 },

1617

/*

1618

* These reproduce what we would get without ARGP_NO_HELP

1619

*/

1620

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

1621

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

1622

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

1623

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

1624

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

1625

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

1626

1134

{ .name = NULL }

1627

1135

};

1628

1136

1629

1137

error_t parse_opt(int key, char *arg,

1630

1138

struct argp_state *state){

1631

errno = 0;

1632

1139

switch(key){

1633

1140

case 128: /* --debug */

1634

1141

debug = true;

1650

1157

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

1651

1158

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

1652

1159

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

1653

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

1160

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

1161

exit(EXIT_FAILURE);

1654

1162

}

1655

1163

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

1656

1164

break;

1661

1169

errno = 0;

1662

1170

delay = strtof(arg, &tmp);

1663

1171

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

1664

argp_error(state, "Bad delay");

1665

}

1666

case 132: /* --retry */

1667

errno = 0;

1668

retry_interval = strtod(arg, &tmp);

1669

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

1670

or (retry_interval * 1000) > INT_MAX

1671

or retry_interval < 0){

1672

argp_error(state, "Bad retry interval");

1673

}

1674

break;

1675

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

1676

hookdir = arg;

1677

break;

1678

/*

1679

* These reproduce what we would get without ARGP_NO_HELP

1680

*/

1681

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

1682

argp_state_help(state, state->out_stream,

1683

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1684

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1685

case -3: /* --usage */

1686

argp_state_help(state, state->out_stream,

1687

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1688

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

1689

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

1690

exit(argp_err_exit_status);

1172

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

1173

exit(EXIT_FAILURE);

1174

}

1175

break;

1176

case ARGP_KEY_ARG:

1177

argp_usage(state);

1178

case ARGP_KEY_END:

1691

1179

break;

1692

1180

default:

1693

1181

return ARGP_ERR_UNKNOWN;

1694

1182

}

1695

return errno;

1183

return 0;

1696

1184

}

1697

1185

1698

1186

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

1699

1187

.args_doc = "",

1700

1188

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

1701

1189

" passwords from a Mandos server" };

1702

ret = argp_parse(&argp, argc, argv,

1703

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1704

switch(ret){

1705

case 0:

1706

break;

1707

case ENOMEM:

1708

default:

1709

errno = ret;

1710

perror_plus("argp_parse");

1711

exitcode = EX_OSERR;

1712

goto end;

1713

case EINVAL:

1714

exitcode = EX_USAGE;

1715

goto end;

1716

}

1717

}

1718

1719

{

1720

/* Work around Debian bug #633582:

1721

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

1722

1723

/* Re-raise priviliges */

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

1728

} else {

1729

struct stat st;

1730

1731

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

1732

int seckey_fd = open(seckey, O_RDONLY);

1733

if(seckey_fd == -1){

1734

perror_plus("open");

1735

} else {

1736

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

1737

if(ret == -1){

1738

perror_plus("fstat");

1739

} else {

1740

if(S_ISREG(st.st_mode)

1741

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

1742

ret = fchown(seckey_fd, uid, gid);

1743

if(ret == -1){

1744

perror_plus("fchown");

1745

}

1746

}

1747

}

1748

TEMP_FAILURE_RETRY(close(seckey_fd));

1749

}

1750

}

1751

1752

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

1753

int pubkey_fd = open(pubkey, O_RDONLY);

1754

if(pubkey_fd == -1){

1755

perror_plus("open");

1756

} else {

1757

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

1758

if(ret == -1){

1759

perror_plus("fstat");

1760

} else {

1761

if(S_ISREG(st.st_mode)

1762

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

1763

ret = fchown(pubkey_fd, uid, gid);

1764

if(ret == -1){

1765

perror_plus("fchown");

1766

}

1767

}

1768

}

1769

TEMP_FAILURE_RETRY(close(pubkey_fd));

1770

}

1771

}

1772

1773

/* Lower privileges */

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1779

}

1780

}

1781

1782

/* Run network hooks */

1783

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

1784

goto end;

1190

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

1191

if(ret == ARGP_ERR_UNKNOWN){

1192

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

1193

exitcode = EXIT_FAILURE;

1194

goto end;

1195

}

1785

1196

}

1786

1197

1787

1198

if(not debug){

1788

1199

avahi_set_log_function(empty_log);

1789

1200

}

1790

1201

1791

1202

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

1792

1203

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1204

ret = scandir(sys_class_net, &direntries, good_interface,

1795

1205

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

1206

if(ret >= 1){

1803

/* Pick the first interface returned */

1207

/* Pick the first good interface */

1804

1208

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

1805

if(debug){

1806

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

1807

}

1808

1209

if(interface == NULL){

1809

perror_plus("malloc");

1210

perror("malloc");

1810

1211

free(direntries);

1811

1212

exitcode = EXIT_FAILURE;

1812

1213

goto end;

1814

1215

free(direntries);

1815

1216

} else {

1816

1217

free(direntries);

1817

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

1218

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

1818

1219

exitcode = EXIT_FAILURE;

1819

1220

goto end;

1820

1221

}

1826

1227

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

1827

1228

mc.simple_poll = avahi_simple_poll_new();

1828

1229

if(mc.simple_poll == NULL){

1829

fprintf_plus(stderr,

1830

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

1831

exitcode = EX_UNAVAILABLE;

1230

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

1231

exitcode = EXIT_FAILURE;

1832

1232

goto end;

1833

1233

}

1834

1234

1835

1235

sigemptyset(&sigterm_action.sa_mask);

1836

1236

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

1837

1237

if(ret == -1){

1838

perror_plus("sigaddset");

1839

exitcode = EX_OSERR;

1238

perror("sigaddset");

1239

exitcode = EXIT_FAILURE;

1840

1240

goto end;

1841

1241

}

1842

1242

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

1843

1243

if(ret == -1){

1844

perror_plus("sigaddset");

1845

exitcode = EX_OSERR;

1244

perror("sigaddset");

1245

exitcode = EXIT_FAILURE;

1846

1246

goto end;

1847

1247

}

1848

1248

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

1849

1249

if(ret == -1){

1850

perror_plus("sigaddset");

1851

exitcode = EX_OSERR;

1250

perror("sigaddset");

1251

exitcode = EXIT_FAILURE;

1852

1252

goto end;

1853

1253

}

1854

1254

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

1857

1257

*/

1858

1258

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

1859

1259

if(ret == -1){

1860

perror_plus("sigaction");

1861

return EX_OSERR;

1260

perror("sigaction");

1261

return EXIT_FAILURE;

1862

1262

}

1863

1263

if(old_sigterm_action.sa_handler != SIG_IGN){

1864

1264

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

1865

1265

if(ret == -1){

1866

perror_plus("sigaction");

1867

exitcode = EX_OSERR;

1266

perror("sigaction");

1267

exitcode = EXIT_FAILURE;

1868

1268

goto end;

1869

1269

}

1870

1270

}

1871

1271

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

1872

1272

if(ret == -1){

1873

perror_plus("sigaction");

1874

return EX_OSERR;

1273

perror("sigaction");

1274

return EXIT_FAILURE;

1875

1275

}

1876

1276

if(old_sigterm_action.sa_handler != SIG_IGN){

1877

1277

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

1878

1278

if(ret == -1){

1879

perror_plus("sigaction");

1880

exitcode = EX_OSERR;

1279

perror("sigaction");

1280

exitcode = EXIT_FAILURE;

1881

1281

goto end;

1882

1282

}

1883

1283

}

1884

1284

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

1885

1285

if(ret == -1){

1886

perror_plus("sigaction");

1887

return EX_OSERR;

1286

perror("sigaction");

1287

return EXIT_FAILURE;

1888

1288

}

1889

1289

if(old_sigterm_action.sa_handler != SIG_IGN){

1890

1290

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

1891

1291

if(ret == -1){

1892

perror_plus("sigaction");

1893

exitcode = EX_OSERR;

1292

perror("sigaction");

1293

exitcode = EXIT_FAILURE;

1894

1294

goto end;

1895

1295

}

1896

1296

}

1899

1299

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

1900

1300

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

1301

if(if_index == 0){

1902

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

1903

exitcode = EX_UNAVAILABLE;

1302

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

1303

exitcode = EXIT_FAILURE;

1904

1304

goto end;

1905

1305

}

1906

1306

1912

1312

errno = 0;

1913

1313

ret = seteuid(0);

1914

1314

if(ret == -1){

1915

perror_plus("seteuid");

1315

perror("seteuid");

1916

1316

}

1917

1317

1918

1318

#ifdef __linux__

1919

1319

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1920

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

1320

messages to mess up the prompt */

1921

1321

ret = klogctl(8, NULL, 5);

1922

1322

bool restore_loglevel = true;

1923

1323

if(ret == -1){

1924

1324

restore_loglevel = false;

1925

perror_plus("klogctl");

1325

perror("klogctl");

1926

1326

}

1927

1327

#endif /* __linux__ */

1928

1328

1929

1329

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1930

1330

if(sd < 0){

1931

perror_plus("socket");

1932

exitcode = EX_OSERR;

1331

perror("socket");

1332

exitcode = EXIT_FAILURE;

1933

1333

#ifdef __linux__

1934

1334

if(restore_loglevel){

1935

1335

ret = klogctl(7, NULL, 0);

1936

1336

if(ret == -1){

1937

perror_plus("klogctl");

1337

perror("klogctl");

1938

1338

}

1939

1339

}

1940

1340

#endif /* __linux__ */

1942

1342

errno = 0;

1943

1343

ret = seteuid(uid);

1944

1344

if(ret == -1){

1945

perror_plus("seteuid");

1345

perror("seteuid");

1946

1346

}

1947

1347

goto end;

1948

1348

}

1949

1349

strcpy(network.ifr_name, interface);

1950

1350

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

1951

1351

if(ret == -1){

1952

perror_plus("ioctl SIOCGIFFLAGS");

1352

perror("ioctl SIOCGIFFLAGS");

1953

1353

#ifdef __linux__

1954

1354

if(restore_loglevel){

1955

1355

ret = klogctl(7, NULL, 0);

1956

1356

if(ret == -1){

1957

perror_plus("klogctl");

1357

perror("klogctl");

1958

1358

}

1959

1359

}

1960

1360

#endif /* __linux__ */

1961

exitcode = EX_OSERR;

1361

exitcode = EXIT_FAILURE;

1962

1362

/* Lower privileges */

1963

1363

errno = 0;

1964

1364

ret = seteuid(uid);

1965

1365

if(ret == -1){

1966

perror_plus("seteuid");

1366

perror("seteuid");

1967

1367

}

1968

1368

goto end;

1969

1369

}

1973

1373

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

1974

1374

if(ret == -1){

1975

1375

take_down_interface = false;

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1977

exitcode = EX_OSERR;

1376

perror("ioctl SIOCSIFFLAGS");

1377

exitcode = EXIT_FAILURE;

1978

1378

#ifdef __linux__

1979

1379

if(restore_loglevel){

1980

1380

ret = klogctl(7, NULL, 0);

1981

1381

if(ret == -1){

1982

perror_plus("klogctl");

1382

perror("klogctl");

1983

1383

}

1984

1384

}

1985

1385

#endif /* __linux__ */

1987

1387

errno = 0;

1988

1388

ret = seteuid(uid);

1989

1389

if(ret == -1){

1990

perror_plus("seteuid");

1390

perror("seteuid");

1991

1391

}

1992

1392

goto end;

1993

1393

}

1994

1394

}

1995

/* Sleep checking until interface is running.

1996

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

1395

/* sleep checking until interface is running */

1997

1396

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

1998

1397

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

1999

1398

if(ret == -1){

2000

perror_plus("ioctl SIOCGIFFLAGS");

1399

perror("ioctl SIOCGIFFLAGS");

2001

1400

} else if(network.ifr_flags & IFF_RUNNING){

2002

1401

break;

2003

1402

}

2004

1403

struct timespec sleeptime = { .tv_nsec = 250000000 };

2005

1404

ret = nanosleep(&sleeptime, NULL);

2006

1405

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

2007

perror_plus("nanosleep");

1406

perror("nanosleep");

2008

1407

}

2009

1408

}

2010

1409

if(not take_down_interface){

2011

1410

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

2012

1411

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

2013

1412

if(ret == -1){

2014

perror_plus("close");

1413

perror("close");

2015

1414

}

2016

1415

}

2017

1416

#ifdef __linux__

2019

1418

/* Restores kernel loglevel to default */

2020

1419

ret = klogctl(7, NULL, 0);

2021

1420

if(ret == -1){

2022

perror_plus("klogctl");

1421

perror("klogctl");

2023

1422

}

2024

1423

}

2025

1424

#endif /* __linux__ */

2026

1425

/* Lower privileges */

2027

1426

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

1427

if(take_down_interface){

1428

/* Lower privileges */

1429

ret = seteuid(uid);

1430

if(ret == -1){

1431

perror("seteuid");

1432

}

1433

} else {

1434

/* Lower privileges permanently */

1435

ret = setuid(uid);

1436

if(ret == -1){

1437

perror("setuid");

1438

}

2032

1439

}

2033

1440

}

2034

1441

2038

1445

2039

1446

ret = init_gnutls_global(pubkey, seckey);

2040

1447

if(ret == -1){

2041

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

2042

exitcode = EX_UNAVAILABLE;

1448

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

1449

exitcode = EXIT_FAILURE;

2043

1450

goto end;

2044

1451

} else {

2045

1452

gnutls_initialized = true;

2049

1456

goto end;

2050

1457

}

2051

1458

1459

tempdir_created = true;

2052

1460

if(mkdtemp(tempdir) == NULL){

2053

perror_plus("mkdtemp");

1461

tempdir_created = false;

1462

perror("mkdtemp");

2054

1463

goto end;

2055

1464

}

2056

tempdir_created = true;

2057

1465

2058

1466

if(quit_now){

2059

1467

goto end;

2060

1468

}

2061

1469

2062

1470

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

2063

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

2064

exitcode = EX_UNAVAILABLE;

1471

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

1472

exitcode = EXIT_FAILURE;

2065

1473

goto end;

2066

1474

} else {

2067

1475

gpgme_initialized = true;

2076

1484

/* (Mainly meant for debugging) */

2077

1485

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

2078

1486

if(address == NULL){

2079

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

2080

exitcode = EX_USAGE;

1487

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

1488

exitcode = EXIT_FAILURE;

2081

1489

goto end;

2082

1490

}

2083

1491

2090

1498

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

2091

1499

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

2092

1500

or tmpmax != (uint16_t)tmpmax){

2093

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

2094

exitcode = EX_USAGE;

1501

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

1502

exitcode = EXIT_FAILURE;

2095

1503

goto end;

2096

1504

}

2097

1505

2101

1509

2102

1510

port = (uint16_t)tmpmax;

2103

1511

*address = '\0';

1512

address = connect_to;

2104

1513

/* Colon in address indicates IPv6 */

2105

1514

int af;

2106

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

1515

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

2107

1516

af = AF_INET6;

2108

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

2109

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

2110

{

2111

connect_to++;

2112

address[-1] = '\0';

2113

}

2114

1517

} else {

2115

1518

af = AF_INET;

2116

1519

}

2117

address = connect_to;

2118

1520

2119

1521

if(quit_now){

2120

1522

goto end;

2121

1523

}

2122

1524

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){

1525

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

1526

if(ret < 0){

1527

exitcode = EXIT_FAILURE;

1528

} else {

2136

1529

exitcode = EXIT_SUCCESS;

2137

1530

}

2138

2139

1531

goto end;

2140

1532

}

2141

1533

2163

1555

2164

1556

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

2165

1557

if(mc.server == NULL){

2166

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

2167

avahi_strerror(error));

2168

exitcode = EX_UNAVAILABLE;

1558

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

1559

avahi_strerror(error));

1560

exitcode = EXIT_FAILURE;

2169

1561

goto end;

2170

1562

}

2171

1563

2178

1570

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2179

1571

NULL, 0, browse_callback, NULL);

2180

1572

if(sb == NULL){

2181

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

2182

avahi_strerror(avahi_server_errno(mc.server)));

2183

exitcode = EX_UNAVAILABLE;

1573

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

1574

avahi_strerror(avahi_server_errno(mc.server)));

1575

exitcode = EXIT_FAILURE;

2184

1576

goto end;

2185

1577

}

2186

1578

2191

1583

/* Run the main loop */

2192

1584

2193

1585

if(debug){

2194

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

2195

}

2196

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

2199

if(debug){

2200

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

2201

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

2202

}

1586

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

1587

}

1588

1589

avahi_simple_poll_loop(mc.simple_poll);

2203

1590

2204

1591

end:

2205

1592

2206

1593

if(debug){

2207

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

1594

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

2208

1595

}

2209

1596

2210

1597

/* Cleanup things */

2227

1614

gpgme_release(mc.ctx);

2228

1615

}

2229

1616

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

{

1617

/* Take down the network interface */

1618

if(take_down_interface){

1619

/* Re-raise priviliges */

2246

1620

errno = 0;

2247

1621

ret = seteuid(0);

2248

1622

if(ret == -1){

2249

perror_plus("seteuid");

1623

perror("seteuid");

2250

1624

}

2251

2252

/* Take down the network interface */

2253

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

1625

if(geteuid() == 0){

2254

1626

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

2255

1627

if(ret == -1){

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

2258

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

1628

perror("ioctl SIOCGIFFLAGS");

1629

} else if(network.ifr_flags & IFF_UP) {

1630

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

2259

1631

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

2260

1632

if(ret == -1){

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1633

perror("ioctl SIOCSIFFLAGS");

2262

1634

}

2263

1635

}

2264

1636

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

2265

1637

if(ret == -1){

2266

perror_plus("close");

1638

perror("close");

1639

}

1640

/* Lower privileges permanently */

1641

errno = 0;

1642

ret = setuid(uid);

1643

if(ret == -1){

1644

perror("setuid");

2267

1645

}

2268

1646

}

2269

1647

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2276

1648

2277

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

1649

/* Removes the temp directory used by GPGME */

2278

1650

if(tempdir_created){

2279

struct dirent **direntries = NULL;

2280

struct dirent *direntry = NULL;

2281

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

2282

alphasort);

2283

if (numentries > 0){

2284

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

2285

direntry = direntries[i];

1651

DIR *d;

1652

struct dirent *direntry;

1653

d = opendir(tempdir);

1654

if(d == NULL){

1655

if(errno != ENOENT){

1656

perror("opendir");

1657

}

1658

} else {

1659

while(true){

1660

direntry = readdir(d);

1661

if(direntry == NULL){

1662

break;

1663

}

1664

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

1665

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

1666

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

1667

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

1668

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

1669

continue;

1670

}

2286

1671

char *fullname = NULL;

2287

1672

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

2288

1673

direntry->d_name);

2289

1674

if(ret < 0){

2290

perror_plus("asprintf");

1675

perror("asprintf");

2291

1676

continue;

2292

1677

}

2293

1678

ret = remove(fullname);

2294

1679

if(ret == -1){

2295

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

2296

strerror(errno));

1680

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

1681

strerror(errno));

2297

1682

}

2298

1683

free(fullname);

2299

1684

}

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");

1685

closedir(d);

2306

1686

}

2307

1687

ret = rmdir(tempdir);

2308

1688

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

2309

perror_plus("rmdir");

1689

perror("rmdir");

2310

1690

}

2311

1691

}

2312

1692

2317

1697

&old_sigterm_action,

2318

1698

NULL));

2319

1699

if(ret == -1){

2320

perror_plus("sigaction");

1700

perror("sigaction");

2321

1701

}

2322

1702

do {

2323

1703

ret = raise(signal_received);

2324

1704

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

2325

1705

if(ret != 0){

2326

perror_plus("raise");

1706

perror("raise");

2327

1707

abort();

2328

1708

}

2329

1709

TEMP_FAILURE_RETRY(pause());