/mandos/release : revision 237.2.133

9

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

10

*

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* Everything else is

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13

12

13

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

31

32

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

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stdout, ferror(), remove() */

44

#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() */

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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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if_nametoindex(), IF_NAMESIZE */

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72

*/

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73

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

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74

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

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setgid(), pause() */

77

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

75

setgid() */

76

#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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79

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() */

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(),

89

WEXITSTATUS(), WTERMSIG() */

90

85

91

86

#ifdef __linux__

92

87

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

110

105

init_gnutls_session(),

111

106

GNUTLS_* */

112

107

#include <gnutls/openpgp.h>

113

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

108

/* gnutls_certificate_set_openpgp_key_file(),

109

GNUTLS_OPENPGP_FMT_BASE64 */

115

110

116

111

/* GPGME */

117

112

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

125

120

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

126

121

#define SECKEY "seckey.txt"

127

122

#define PUBKEY "pubkey.txt"

128

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

129

123

130

124

bool debug = false;

131

125

static const char mandos_protocol_version[] = "1";

132

126

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

133

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

134

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

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

138

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

139

typedef struct server{

140

const char *ip;

141

uint16_t port;

142

AvahiIfIndex if_index;

143

int af;

144

struct timespec last_seen;

145

struct server *next;

146

struct server *prev;

147

} server;

127

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

148

128

149

129

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

150

130

typedef struct {

155

135

gnutls_dh_params_t dh_params;

156

136

const char *priority;

157

137

gpgme_ctx_t ctx;

158

server *current_server;

159

138

} mandos_context;

160

139

161

140

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

162

141

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

163

142

.dh_bits = 1024, .priority = "SECURE256"

164

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

165

.current_server = NULL };

166

167

sig_atomic_t quit_now = 0;

168

int signal_received = 0;

169

170

/* Function to use when printing errors */

171

void perror_plus(const char *print_text){

172

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

173

program_invocation_short_name);

174

perror(print_text);

175

}

176

177

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

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

183

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

184

}

143

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

185

144

186

145

/*

187

146

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

189

148

* "buffer_length" is how much is already used.

190

149

*/

191

150

size_t incbuffer(char **buffer, size_t buffer_length,

192

size_t buffer_capacity){

151

size_t buffer_capacity){

193

152

if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

153

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

195

154

if(buffer == NULL){

200

159

return buffer_capacity;

201

160

}

202

161

203

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

204

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

205

int af){

206

int ret;

207

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

208

if(new_server == NULL){

209

perror_plus("malloc");

210

return -1;

211

}

212

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

213

.port = port,

214

.if_index = if_index,

215

.af = af };

216

if(new_server->ip == NULL){

217

perror_plus("strdup");

218

return -1;

219

}

220

/* Special case of first server */

221

if (mc.current_server == NULL){

222

new_server->next = new_server;

223

new_server->prev = new_server;

224

mc.current_server = new_server;

225

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

226

} else {

227

new_server->next = mc.current_server;

228

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

229

new_server->prev->next = new_server;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

238

}

239

240

162

/*

241

163

* Initialize GPGME.

242

164

*/

243

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

244

const char *tempdir){

165

static bool init_gpgme(const char *seckey,

166

const char *pubkey, const char *tempdir){

245

167

gpgme_error_t rc;

246

168

gpgme_engine_info_t engine_info;

247

169

256

178

257

179

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

258

180

if(fd == -1){

259

perror_plus("open");

181

perror("open");

260

182

return false;

261

183

}

262

184

263

185

rc = gpgme_data_new_from_fd(&pgp_data, fd);

264

186

if(rc != GPG_ERR_NO_ERROR){

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

187

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

188

gpgme_strsource(rc), gpgme_strerror(rc));

267

189

return false;

268

190

}

269

191

270

192

rc = gpgme_op_import(mc.ctx, pgp_data);

271

193

if(rc != GPG_ERR_NO_ERROR){

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

194

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

195

gpgme_strsource(rc), gpgme_strerror(rc));

274

196

return false;

275

197

}

276

198

277

199

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

278

200

if(ret == -1){

279

perror_plus("close");

201

perror("close");

280

202

}

281

203

gpgme_data_release(pgp_data);

282

204

return true;

283

205

}

284

206

285

207

if(debug){

286

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

208

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

287

209

}

288

210

289

211

/* Init GPGME */

290

212

gpgme_check_version(NULL);

291

213

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

292

214

if(rc != GPG_ERR_NO_ERROR){

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

215

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

216

gpgme_strsource(rc), gpgme_strerror(rc));

295

217

return false;

296

218

}

297

219

298

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

220

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

299

221

rc = gpgme_get_engine_info(&engine_info);

300

222

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

223

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

224

gpgme_strsource(rc), gpgme_strerror(rc));

303

225

return false;

304

226

}

305

227

while(engine_info != NULL){

311

233

engine_info = engine_info->next;

312

234

}

313

235

if(engine_info == NULL){

314

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

315

tempdir);

236

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

316

237

return false;

317

238

}

318

239

319

240

/* Create new GPGME "context" */

320

241

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

321

242

if(rc != GPG_ERR_NO_ERROR){

322

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

323

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

324

gpgme_strerror(rc));

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

325

245

return false;

326

246

}

327

247

346

266

ssize_t plaintext_length = 0;

347

267

348

268

if(debug){

349

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

269

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

350

270

}

351

271

352

272

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

353

273

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

354

274

0);

355

275

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

358

278

return -1;

359

279

}

360

280

361

281

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

362

282

rc = gpgme_data_new(&dh_plain);

363

283

if(rc != GPG_ERR_NO_ERROR){

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

367

286

gpgme_data_release(dh_crypto);

368

287

return -1;

369

288

}

372

291

data buffer */

373

292

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

374

293

if(rc != GPG_ERR_NO_ERROR){

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

377

296

plaintext_length = -1;

378

297

if(debug){

379

298

gpgme_decrypt_result_t result;

380

299

result = gpgme_op_decrypt_result(mc.ctx);

381

300

if(result == NULL){

382

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

301

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

383

302

} else {

384

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

385

result->unsupported_algorithm);

386

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

387

result->wrong_key_usage);

303

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

304

result->unsupported_algorithm);

305

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

306

result->wrong_key_usage);

388

307

if(result->file_name != NULL){

389

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

308

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

390

309

}

391

310

gpgme_recipient_t recipient;

392

311

recipient = result->recipients;

393

312

while(recipient != NULL){

394

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

395

gpgme_pubkey_algo_name

396

(recipient->pubkey_algo));

397

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

398

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

399

recipient->status == GPG_ERR_NO_SECKEY

400

? "No" : "Yes");

313

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

314

gpgme_pubkey_algo_name(recipient->pubkey_algo));

315

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

316

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

317

recipient->status == GPG_ERR_NO_SECKEY

318

? "No" : "Yes");

401

319

recipient = recipient->next;

402

320

}

403

321

}

406

324

}

407

325

408

326

if(debug){

409

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

327

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

410

328

}

411

329

412

330

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

413

331

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

414

perror_plus("gpgme_data_seek");

332

perror("gpgme_data_seek");

415

333

plaintext_length = -1;

416

334

goto decrypt_end;

417

335

}

419

337

*plaintext = NULL;

420

338

while(true){

421

339

plaintext_capacity = incbuffer(plaintext,

422

(size_t)plaintext_length,

423

plaintext_capacity);

340

(size_t)plaintext_length,

341

plaintext_capacity);

424

342

if(plaintext_capacity == 0){

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

343

perror("incbuffer");

344

plaintext_length = -1;

345

goto decrypt_end;

428

346

}

429

347

430

348

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

435

353

break;

436

354

}

437

355

if(ret < 0){

438

perror_plus("gpgme_data_read");

356

perror("gpgme_data_read");

439

357

plaintext_length = -1;

440

358

goto decrypt_end;

441

359

}

443

361

}

444

362

445

363

if(debug){

446

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

364

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

447

365

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

448

366

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

449

367

}

471

389

/* GnuTLS log function callback */

472

390

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

473

391

const char* string){

474

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

392

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

475

393

}

476

394

477

395

static int init_gnutls_global(const char *pubkeyfilename,

479

397

int ret;

480

398

481

399

if(debug){

482

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

400

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

483

401

}

484

402

485

403

ret = gnutls_global_init();

486

404

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

405

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

406

safer_gnutls_strerror(ret));

489

407

return -1;

490

408

}

491

409

498

416

}

499

417

500

418

/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

419

gnutls_certificate_allocate_credentials(&mc.cred);

502

420

if(ret != GNUTLS_E_SUCCESS){

503

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

504

safer_gnutls_strerror(ret));

421

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

422

from

423

-Wunreachable-code

424

*/

425

safer_gnutls_strerror(ret));

505

426

gnutls_global_deinit();

506

427

return -1;

507

428

}

508

429

509

430

if(debug){

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

431

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

432

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

433

seckeyfilename);

514

434

}

515

435

516

436

ret = gnutls_certificate_set_openpgp_key_file

517

437

(mc.cred, pubkeyfilename, seckeyfilename,

518

438

GNUTLS_OPENPGP_FMT_BASE64);

519

439

if(ret != GNUTLS_E_SUCCESS){

520

fprintf_plus(stderr,

521

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

522

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

523

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

524

safer_gnutls_strerror(ret));

440

fprintf(stderr,

441

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

442

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

443

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

444

safer_gnutls_strerror(ret));

525

445

goto globalfail;

526

446

}

527

447

528

448

/* GnuTLS server initialization */

529

449

ret = gnutls_dh_params_init(&mc.dh_params);

530

450

if(ret != GNUTLS_E_SUCCESS){

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

451

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

452

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

534

453

goto globalfail;

535

454

}

536

455

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

537

456

if(ret != GNUTLS_E_SUCCESS){

538

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

539

safer_gnutls_strerror(ret));

457

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

458

safer_gnutls_strerror(ret));

540

459

goto globalfail;

541

460

}

542

461

557

476

/* GnuTLS session creation */

558

477

do {

559

478

ret = gnutls_init(session, GNUTLS_SERVER);

560

if(quit_now){

561

return -1;

562

}

563

479

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

564

480

if(ret != GNUTLS_E_SUCCESS){

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

481

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

482

safer_gnutls_strerror(ret));

568

483

}

569

484

570

485

{

571

486

const char *err;

572

487

do {

573

488

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

574

if(quit_now){

575

gnutls_deinit(*session);

576

return -1;

577

}

578

489

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

579

490

if(ret != GNUTLS_E_SUCCESS){

580

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

581

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

582

safer_gnutls_strerror(ret));

491

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

492

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

493

safer_gnutls_strerror(ret));

583

494

gnutls_deinit(*session);

584

495

return -1;

585

496

}

588

499

do {

589

500

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

590

501

mc.cred);

591

if(quit_now){

592

gnutls_deinit(*session);

593

return -1;

594

}

595

502

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

596

503

if(ret != GNUTLS_E_SUCCESS){

597

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

598

safer_gnutls_strerror(ret));

504

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

505

safer_gnutls_strerror(ret));

599

506

gnutls_deinit(*session);

600

507

return -1;

601

508

}

612

519

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

613

520

__attribute__((unused)) const char *txt){}

614

521

522

sig_atomic_t quit_now = 0;

523

int signal_received = 0;

524

615

525

/* Called when a Mandos server is found */

616

526

static int start_mandos_communication(const char *ip, uint16_t port,

617

527

AvahiIfIndex if_index,

623

533

struct sockaddr_in6 in6;

624

534

} to;

625

535

char *buffer = NULL;

626

char *decrypted_buffer = NULL;

536

char *decrypted_buffer;

627

537

size_t buffer_length = 0;

628

538

size_t buffer_capacity = 0;

629

539

size_t written;

630

int retval = -1;

540

int retval = 0;

631

541

gnutls_session_t session;

632

542

int pf; /* Protocol family */

633

543

634

errno = 0;

635

636

544

if(quit_now){

637

errno = EINTR;

638

545

return -1;

639

546

}

640

547

646

553

pf = PF_INET;

647

554

break;

648

555

default:

649

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

650

errno = EINVAL;

556

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

651

557

return -1;

652

558

}

653

559

657

563

}

658

564

659

565

if(debug){

660

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

661

PRIu16 "\n", ip, port);

566

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

567

"\n", ip, port);

662

568

}

663

569

664

570

tcp_sd = socket(pf, SOCK_STREAM, 0);

665

571

if(tcp_sd < 0){

666

int e = errno;

667

perror_plus("socket");

668

errno = e;

572

perror("socket");

573

retval = -1;

669

574

goto mandos_end;

670

575

}

671

576

672

577

if(quit_now){

673

errno = EINTR;

674

578

goto mandos_end;

675

579

}

676

580

683

587

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

684

588

}

685

589

if(ret < 0 ){

686

int e = errno;

687

perror_plus("inet_pton");

688

errno = e;

590

perror("inet_pton");

591

retval = -1;

689

592

goto mandos_end;

690

593

}

691

594

if(ret == 0){

692

int e = errno;

693

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

694

errno = e;

595

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

596

retval = -1;

695

597

goto mandos_end;

696

598

}

697

599

if(af == AF_INET6){

701

603

702

604

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

605

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

704

-Wunreachable-code*/

606

-Wunreachable-code*/

705

607

if(if_index == AVAHI_IF_UNSPEC){

706

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

707

" incomplete without a network interface\n");

708

errno = EINVAL;

608

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

609

" without a network interface\n");

610

retval = -1;

709

611

goto mandos_end;

710

612

}

711

613

/* Set the network interface number as scope */

718

620

}

719

621

720

622

if(quit_now){

721

errno = EINTR;

722

623

goto mandos_end;

723

624

}

724

625

726

627

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

727

628

char interface[IF_NAMESIZE];

728

629

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

729

perror_plus("if_indextoname");

630

perror("if_indextoname");

730

631

} else {

731

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

732

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

632

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

633

ip, interface, port);

733

634

}

734

635

} else {

735

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

736

ip, port);

636

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

637

port);

737

638

}

738

639

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

640

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

746

647

sizeof(addrstr));

747

648

}

748

649

if(pcret == NULL){

749

perror_plus("inet_ntop");

650

perror("inet_ntop");

750

651

} else {

751

652

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

752

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

653

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

753

654

}

754

655

}

755

656

}

756

657

757

658

if(quit_now){

758

errno = EINTR;

759

659

goto mandos_end;

760

660

}

761

661

765

665

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

766

666

}

767

667

if(ret < 0){

768

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

769

int e = errno;

770

perror_plus("connect");

771

errno = e;

772

}

668

perror("connect");

669

retval = -1;

773

670

goto mandos_end;

774

671

}

775

672

776

673

if(quit_now){

777

errno = EINTR;

778

674

goto mandos_end;

779

675

}

780

676

783

679

while(true){

784

680

size_t out_size = strlen(out);

785

681

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

786

out_size - written));

682

out_size - written));

787

683

if(ret == -1){

788

int e = errno;

789

perror_plus("write");

790

errno = e;

684

perror("write");

685

retval = -1;

791

686

goto mandos_end;

792

687

}

793

688

written += (size_t)ret;

803

698

}

804

699

805

700

if(quit_now){

806

errno = EINTR;

807

701

goto mandos_end;

808

702

}

809

703

}

810

704

811

705

if(debug){

812

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

706

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

813

707

}

814

708

815

709

if(quit_now){

816

errno = EINTR;

817

710

goto mandos_end;

818

711

}

819

712

820

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

821

713

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

822

714

823

715

if(quit_now){

824

errno = EINTR;

825

716

goto mandos_end;

826

717

}

827

718

828

719

do {

829

720

ret = gnutls_handshake(session);

830

721

if(quit_now){

831

errno = EINTR;

832

722

goto mandos_end;

833

723

}

834

724

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

835

725

836

726

if(ret != GNUTLS_E_SUCCESS){

837

727

if(debug){

838

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

728

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

839

729

gnutls_perror(ret);

840

730

}

841

errno = EPROTO;

731

retval = -1;

842

732

goto mandos_end;

843

733

}

844

734

845

735

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

846

736

847

737

if(debug){

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

738

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

739

ip);

850

740

}

851

741

852

742

while(true){

853

743

854

744

if(quit_now){

855

errno = EINTR;

856

745

goto mandos_end;

857

746

}

858

747

859

748

buffer_capacity = incbuffer(&buffer, buffer_length,

860

buffer_capacity);

749

buffer_capacity);

861

750

if(buffer_capacity == 0){

862

int e = errno;

863

perror_plus("incbuffer");

864

errno = e;

751

perror("incbuffer");

752

retval = -1;

865

753

goto mandos_end;

866

754

}

867

755

868

756

if(quit_now){

869

errno = EINTR;

870

757

goto mandos_end;

871

758

}

872

759

885

772

ret = gnutls_handshake(session);

886

773

887

774

if(quit_now){

888

errno = EINTR;

889

775

goto mandos_end;

890

776

}

891

777

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

892

778

if(ret < 0){

893

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

894

"***\n");

779

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

895

780

gnutls_perror(ret);

896

errno = EPROTO;

781

retval = -1;

897

782

goto mandos_end;

898

783

}

899

784

break;

900

785

default:

901

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

902

" encrypted session with Mandos server\n");

786

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

787

" encrypted session with Mandos server\n");

788

retval = -1;

903

789

gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

errno = EIO;

905

790

goto mandos_end;

906

791

}

907

792

} else {

910

795

}

911

796

912

797

if(debug){

913

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

914

}

915

916

if(quit_now){

917

errno = EINTR;

918

goto mandos_end;

919

}

920

921

do {

922

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

923

if(quit_now){

924

errno = EINTR;

925

goto mandos_end;

926

}

927

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

798

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

799

}

800

801

if(quit_now){

802

goto mandos_end;

803

}

804

805

gnutls_bye(session, GNUTLS_SHUT_RDWR);

806

807

if(quit_now){

808

goto mandos_end;

809

}

928

810

929

811

if(buffer_length > 0){

930

812

ssize_t decrypted_buffer_size;

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

813

decrypted_buffer_size = pgp_packet_decrypt(buffer,

814

buffer_length,

932

815

&decrypted_buffer);

933

816

if(decrypted_buffer_size >= 0){

934

817

935

818

written = 0;

936

819

while(written < (size_t) decrypted_buffer_size){

937

820

if(quit_now){

938

errno = EINTR;

939

821

goto mandos_end;

940

822

}

941

823

943

825

(size_t)decrypted_buffer_size - written,

944

826

stdout);

945

827

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

946

int e = errno;

947

828

if(debug){

948

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

949

strerror(errno));

829

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

830

strerror(errno));

950

831

}

951

errno = e;

952

goto mandos_end;

832

retval = -1;

833

break;

953

834

}

954

835

written += (size_t)ret;

955

836

}

956

retval = 0;

837

free(decrypted_buffer);

838

} else {

839

retval = -1;

957

840

}

841

} else {

842

retval = -1;

958

843

}

959

844

960

845

/* Shutdown procedure */

961

846

962

847

mandos_end:

963

{

964

int e = errno;

965

free(decrypted_buffer);

966

free(buffer);

967

if(tcp_sd >= 0){

968

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

969

}

970

if(ret == -1){

971

if(e == 0){

972

e = errno;

973

}

974

perror_plus("close");

975

}

976

gnutls_deinit(session);

977

errno = e;

978

if(quit_now){

979

errno = EINTR;

980

retval = -1;

981

}

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;

982

858

}

983

859

return retval;

984

860

}

1009

885

switch(event){

1010

886

default:

1011

887

case AVAHI_RESOLVER_FAILURE:

1012

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

1013

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

1014

domain,

1015

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)));

1016

891

break;

1017

892

1018

893

case AVAHI_RESOLVER_FOUND:

1020

895

char ip[AVAHI_ADDRESS_STR_MAX];

1021

896

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

1022

897

if(debug){

1023

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

1024

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

1025

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);

1026

901

}

1027

902

int ret = start_mandos_communication(ip, port, interface,

1028

903

avahi_proto_to_af(proto));

1029

904

if(ret == 0){

1030

905

avahi_simple_poll_quit(mc.simple_poll);

1031

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1034

906

}

1035

907

}

1036

908

}

1060

932

default:

1061

933

case AVAHI_BROWSER_FAILURE:

1062

934

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

935

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

936

avahi_strerror(avahi_server_errno(mc.server)));

1065

937

avahi_simple_poll_quit(mc.simple_poll);

1066

938

return;

1067

939

1074

946

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

1075

947

name, type, domain, protocol, 0,

1076

948

resolve_callback, NULL) == NULL)

1077

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

1078

" %s\n", name,

1079

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)));

1080

951

break;

1081

952

1082

953

case AVAHI_BROWSER_REMOVE:

1085

956

case AVAHI_BROWSER_ALL_FOR_NOW:

1086

957

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1087

958

if(debug){

1088

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

1089

" searching...\n");

959

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

1090

960

}

1091

961

break;

1092

962

}

1093

963

}

1094

964

1095

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

965

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

1096

966

static void handle_sigterm(int sig){

1097

967

if(quit_now){

1098

968

return;

1100

970

quit_now = 1;

1101

971

signal_received = sig;

1102

972

int old_errno = errno;

1103

/* set main loop to exit */

1104

973

if(mc.simple_poll != NULL){

1105

974

avahi_simple_poll_quit(mc.simple_poll);

1106

975

}

1107

976

errno = old_errno;

1108

977

}

1109

978

1110

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

1111

int ret;

1112

1113

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

1114

if(s < 0){

1115

perror_plus("socket");

1116

return false;

1117

}

1118

strcpy(ifr->ifr_name, ifname);

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

if(ret == -1){

1121

if(debug){

1122

perror_plus("ioctl SIOCGIFFLAGS");

1123

}

1124

return false;

1125

}

1126

return true;

1127

}

1128

1129

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

1130

1131

/* Reject the loopback device */

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1133

if(debug){

1134

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

1135

ifname);

1136

}

1137

return false;

1138

}

1139

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

1140

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

1141

if(debug){

1142

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

1143

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

1144

}

1145

return true;

1146

}

1147

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

1148

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

1149

if(debug){

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1152

}

1153

return false;

1154

}

1155

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

1156

if(ifr->ifr_flags & IFF_NOARP){

1157

if(debug){

1158

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

1159

ifname);

1160

}

1161

return false;

1162

}

1163

1164

/* Accept this device */

1165

if(debug){

1166

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

1167

}

1168

return true;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device.

1174

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

1175

*/

1176

int good_interface(const struct dirent *if_entry){

1177

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

1178

return 0;

1179

}

1180

1181

struct ifreq ifr;

1182

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

1183

if(debug){

1184

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

1185

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

1186

}

1187

return 0;

1188

}

1189

1190

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

1191

return 0;

1192

}

1193

return 1;

1194

}

1195

1196

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

1237

}

1238

1239

int notdotentries(const struct dirent *direntry){

1240

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

1241

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

1242

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

1243

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

1244

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

1245

return 0;

1246

}

1247

return 1;

1248

}

1249

1250

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

1251

int runnable_hook(const struct dirent *direntry){

1252

int ret;

1253

size_t sret;

1254

struct stat st;

1255

1256

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

1257

/* Empty name? */

1258

return 0;

1259

}

1260

1261

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

1262

"abcdefghijklmnopqrstuvwxyz"

1263

"0123456789"

1264

"_-");

1265

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

1266

/* Contains non-allowed characters */

1267

if(debug){

1268

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

1269

direntry->d_name);

1270

}

1271

return 0;

1272

}

1273

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1282

if(ret == -1){

1283

if(debug){

1284

perror_plus("Could not stat hook");

1285

}

1286

return 0;

1287

}

1288

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

1289

/* Not a regular file */

1290

if(debug){

1291

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

1292

direntry->d_name);

1293

}

1294

return 0;

1295

}

1296

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

1297

/* Not executable */

1298

if(debug){

1299

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

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

return 1;

1305

}

1306

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1308

int ret;

1309

struct timespec now;

1310

struct timespec waited_time;

1311

intmax_t block_time;

1312

1313

while(true){

1314

if(mc.current_server == NULL){

1315

if (debug){

1316

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

1317

" No timeout!\n");

1318

}

1319

ret = avahi_simple_poll_iterate(s, -1);

1320

} else {

1321

if (debug){

1322

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

1323

" it, or wait\n");

1324

}

1325

/* the current time */

1326

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1327

if(ret == -1){

1328

perror_plus("clock_gettime");

1329

return -1;

1330

}

1331

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

1332

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

1333

waited_time.tv_sec = (now.tv_sec

1334

- mc.current_server->last_seen.tv_sec);

1335

waited_time.tv_nsec = (now.tv_nsec

1336

- mc.current_server->last_seen.tv_nsec);

1337

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

1338

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

1339

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

1340

block_time = ((retry_interval

1341

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

1342

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

1343

1344

if (debug){

1345

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

1346

block_time);

1347

}

1348

1349

if(block_time <= 0){

1350

ret = start_mandos_communication(mc.current_server->ip,

1351

mc.current_server->port,

1352

mc.current_server->if_index,

1353

mc.current_server->af);

1354

if(ret == 0){

1355

avahi_simple_poll_quit(mc.simple_poll);

1356

return 0;

1357

}

1358

ret = clock_gettime(CLOCK_MONOTONIC,

1359

&mc.current_server->last_seen);

1360

if(ret == -1){

1361

perror_plus("clock_gettime");

1362

return -1;

1363

}

1364

mc.current_server = mc.current_server->next;

1365

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

1366

servers, but don't block */

1367

}

1368

1369

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

1370

}

1371

if(ret != 0){

1372

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

1373

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

1374

}

1375

}

1376

}

1377

}

1378

1379

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

1380

const float delay){

1381

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

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

1385

alphasort);

1386

if(numhooks == -1){

1387

perror_plus("scandir");

1388

} else {

1389

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

1390

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

1391

direntry = direntries[i];

1392

char *fullname = NULL;

1393

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

1394

if(ret < 0){

1395

perror_plus("asprintf");

1396

continue;

1397

}

1398

if(debug){

1399

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

1400

direntry->d_name);

1401

}

1402

pid_t hook_pid = fork();

1403

if(hook_pid == 0){

1404

/* Child */

1405

dup2(devnull, STDIN_FILENO);

1406

close(devnull);

1407

dup2(STDERR_FILENO, STDOUT_FILENO);

1408

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

1409

if(ret == -1){

1410

perror_plus("setenv");

1411

return false;

1412

}

1413

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

1414

if(ret == -1){

1415

perror_plus("setenv");

1416

return false;

1417

}

1418

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

1419

if(ret == -1){

1420

perror_plus("setenv");

1421

return false;

1422

}

1423

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

1424

if(ret == -1){

1425

perror_plus("setenv");

1426

return false;

1427

}

1428

char *delaystring;

1429

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

1430

if(ret == -1){

1431

perror_plus("asprintf");

1432

return false;

1433

}

1434

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

1435

if(ret == -1){

1436

free(delaystring);

1437

perror_plus("setenv");

1438

return false;

1439

}

1440

free(delaystring);

1441

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

1442

perror_plus("execl");

1443

} else {

1444

int status;

1445

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

1446

perror_plus("waitpid");

1447

free(fullname);

1448

continue;

1449

}

1450

if(WIFEXITED(status)){

1451

if(WEXITSTATUS(status) != 0){

1452

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

1453

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

1454

WEXITSTATUS(status));

1455

free(fullname);

1456

continue;

1457

}

1458

} else if(WIFSIGNALED(status)){

1459

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

1460

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

1461

WTERMSIG(status));

1462

free(fullname);

1463

continue;

1464

} else {

1465

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

1466

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

1467

free(fullname);

1468

continue;

1469

}

1470

}

1471

free(fullname);

1472

if(quit_now){

1473

break;

1474

}

1475

}

1476

close(devnull);

1477

}

1478

return true;

1479

}

1480

1481

979

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

1482

980

AvahiSServiceBrowser *sb = NULL;

1483

981

int error;

1485

983

intmax_t tmpmax;

1486

984

char *tmp;

1487

985

int exitcode = EXIT_SUCCESS;

1488

const char *interface = "";

986

const char *interface = "eth0";

1489

987

struct ifreq network;

1490

988

int sd = -1;

1491

989

bool take_down_interface = false;

1492

990

uid_t uid;

1493

991

gid_t gid;

992

char *connect_to = NULL;

1494

993

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

1495

994

bool tempdir_created = false;

1496

995

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1500

999

bool gnutls_initialized = false;

1501

1000

bool gpgme_initialized = false;

1502

1001

float delay = 2.5f;

1503

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

1504

retrying the same server again */

1505

1002

1506

1003

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1507

1004

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1513

1010

errno = 0;

1514

1011

ret = setgid(gid);

1515

1012

if(ret == -1){

1516

perror_plus("setgid");

1013

perror("setgid");

1517

1014

}

1518

1015

1519

1016

/* Lower user privileges (temporarily) */

1520

1017

errno = 0;

1521

1018

ret = seteuid(uid);

1522

1019

if(ret == -1){

1523

perror_plus("seteuid");

1020

perror("seteuid");

1524

1021

}

1525

1022

1526

1023

if(quit_now){

1561

1058

.arg = "SECONDS",

1562

1059

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

1563

1060

.group = 2 },

1564

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

1565

.arg = "SECONDS",

1566

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

1567

.group = 2 },

1568

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

1569

.arg = "DIR",

1570

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

1571

.group = 2 },

1572

/*

1573

* These reproduce what we would get without ARGP_NO_HELP

1574

*/

1575

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

1576

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

1577

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

1578

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

1579

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

1580

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

1581

1061

{ .name = NULL }

1582

1062

};

1583

1063

1584

1064

error_t parse_opt(int key, char *arg,

1585

1065

struct argp_state *state){

1586

errno = 0;

1587

1066

switch(key){

1588

1067

case 128: /* --debug */

1589

1068

debug = true;

1605

1084

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

1606

1085

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

1607

1086

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

1608

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

1087

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

1088

exit(EXIT_FAILURE);

1609

1089

}

1610

1090

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

1611

1091

break;

1616

1096

errno = 0;

1617

1097

delay = strtof(arg, &tmp);

1618

1098

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

1619

argp_error(state, "Bad delay");

1620

}

1621

case 132: /* --retry */

1622

errno = 0;

1623

retry_interval = strtod(arg, &tmp);

1624

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

1625

or (retry_interval * 1000) > INT_MAX

1626

or retry_interval < 0){

1627

argp_error(state, "Bad retry interval");

1628

}

1629

break;

1630

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

1631

hookdir = arg;

1632

break;

1633

/*

1634

* These reproduce what we would get without ARGP_NO_HELP

1635

*/

1636

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

1637

argp_state_help(state, state->out_stream,

1638

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1639

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1640

case -3: /* --usage */

1641

argp_state_help(state, state->out_stream,

1642

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1643

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

1644

fprintf_plus(state->out_stream,

1645

"Mandos plugin mandos-client: ");

1646

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

1647

exit(argp_err_exit_status);

1099

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

1100

exit(EXIT_FAILURE);

1101

}

1102

break;

1103

case ARGP_KEY_ARG:

1104

argp_usage(state);

1105

case ARGP_KEY_END:

1648

1106

break;

1649

1107

default:

1650

1108

return ARGP_ERR_UNKNOWN;

1651

1109

}

1652

return errno;

1110

return 0;

1653

1111

}

1654

1112

1655

1113

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

1656

1114

.args_doc = "",

1657

1115

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

1658

1116

" passwords from a Mandos server" };

1659

ret = argp_parse(&argp, argc, argv,

1660

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1661

switch(ret){

1662

case 0:

1663

break;

1664

case ENOMEM:

1665

default:

1666

errno = ret;

1667

perror_plus("argp_parse");

1668

exitcode = EX_OSERR;

1669

goto end;

1670

case EINVAL:

1671

exitcode = EX_USAGE;

1672

goto end;

1673

}

1674

}

1675

1676

if(getuid() == 0){

1677

/* Work around Debian bug #633582:

1678

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

1679

struct stat st;

1680

1681

/* Re-raise priviliges */

1682

errno = 0;

1683

ret = seteuid(0);

1684

if(ret == -1){

1685

perror_plus("seteuid");

1686

}

1687

1688

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

1689

int seckey_fd = open(seckey, O_RDONLY);

1690

if(seckey_fd == -1){

1691

perror_plus("open");

1692

} else {

1693

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

1694

if(ret == -1){

1695

perror_plus("fstat");

1696

} else {

1697

if(S_ISREG(st.st_mode)

1698

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

1699

ret = fchown(seckey_fd, uid, gid);

1700

if(ret == -1){

1701

perror_plus("fchown");

1702

}

1703

}

1704

}

1705

TEMP_FAILURE_RETRY(close(seckey_fd));

1706

}

1707

}

1708

1709

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

1710

int pubkey_fd = open(pubkey, O_RDONLY);

1711

if(pubkey_fd == -1){

1712

perror_plus("open");

1713

} else {

1714

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

1715

if(ret == -1){

1716

perror_plus("fstat");

1717

} else {

1718

if(S_ISREG(st.st_mode)

1719

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

1720

ret = fchown(pubkey_fd, uid, gid);

1721

if(ret == -1){

1722

perror_plus("fchown");

1723

}

1724

}

1725

}

1726

TEMP_FAILURE_RETRY(close(pubkey_fd));

1727

}

1728

}

1729

1730

/* Lower privileges */

1731

errno = 0;

1732

ret = seteuid(uid);

1733

if(ret == -1){

1734

perror_plus("seteuid");

1735

}

1736

}

1737

1738

/* Run network hooks */

1739

{

1740

if(getuid() == 0){

1741

/* Re-raise priviliges */

1742

errno = 0;

1743

ret = seteuid(0);

1744

if(ret == -1){

1745

perror_plus("seteuid");

1746

}

1747

}

1748

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

1749

goto end;

1750

}

1751

if(getuid() == 0){

1752

/* Lower privileges */

1753

errno = 0;

1754

ret = seteuid(uid);

1755

if(ret == -1){

1756

perror_plus("seteuid");

1757

}

1117

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

1118

if(ret == ARGP_ERR_UNKNOWN){

1119

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

1120

exitcode = EXIT_FAILURE;

1121

goto end;

1758

1122

}

1759

1123

}

1760

1124

1762

1126

avahi_set_log_function(empty_log);

1763

1127

}

1764

1128

1765

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

1766

struct dirent **direntries;

1767

/* First look for interfaces that are up */

1768

ret = scandir(sys_class_net, &direntries, up_interface,

1769

alphasort);

1770

if(ret == 0){

1771

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

1772

free(direntries);

1773

ret = scandir(sys_class_net, &direntries, good_interface,

1774

alphasort);

1775

}

1776

if(ret >= 1){

1777

/* Pick the first interface returned */

1778

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

1779

if(debug){

1780

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

1781

}

1782

if(interface == NULL){

1783

perror_plus("malloc");

1784

free(direntries);

1785

exitcode = EXIT_FAILURE;

1786

goto end;

1787

}

1788

free(direntries);

1789

} else {

1790

free(direntries);

1791

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

1792

exitcode = EXIT_FAILURE;

1793

goto end;

1794

}

1795

}

1796

1797

1129

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

1798

1130

from the signal handler */

1799

1131

/* Initialize the pseudo-RNG for Avahi */

1800

1132

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

1801

1133

mc.simple_poll = avahi_simple_poll_new();

1802

1134

if(mc.simple_poll == NULL){

1803

fprintf_plus(stderr,

1804

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

1805

exitcode = EX_UNAVAILABLE;

1135

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

1136

exitcode = EXIT_FAILURE;

1806

1137

goto end;

1807

1138

}

1808

1139

1809

1140

sigemptyset(&sigterm_action.sa_mask);

1810

1141

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

1811

1142

if(ret == -1){

1812

perror_plus("sigaddset");

1813

exitcode = EX_OSERR;

1143

perror("sigaddset");

1144

exitcode = EXIT_FAILURE;

1814

1145

goto end;

1815

1146

}

1816

1147

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

1817

1148

if(ret == -1){

1818

perror_plus("sigaddset");

1819

exitcode = EX_OSERR;

1149

perror("sigaddset");

1150

exitcode = EXIT_FAILURE;

1820

1151

goto end;

1821

1152

}

1822

1153

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

1823

1154

if(ret == -1){

1824

perror_plus("sigaddset");

1825

exitcode = EX_OSERR;

1155

perror("sigaddset");

1156

exitcode = EXIT_FAILURE;

1826

1157

goto end;

1827

1158

}

1828

1159

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

1831

1162

*/

1832

1163

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

1833

1164

if(ret == -1){

1834

perror_plus("sigaction");

1835

return EX_OSERR;

1165

perror("sigaction");

1166

return EXIT_FAILURE;

1836

1167

}

1837

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1838

1169

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

1839

1170

if(ret == -1){

1840

perror_plus("sigaction");

1841

exitcode = EX_OSERR;

1171

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1842

1173

goto end;

1843

1174

}

1844

1175

}

1845

1176

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

1846

1177

if(ret == -1){

1847

perror_plus("sigaction");

1848

return EX_OSERR;

1178

perror("sigaction");

1179

return EXIT_FAILURE;

1849

1180

}

1850

1181

if(old_sigterm_action.sa_handler != SIG_IGN){

1851

1182

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

1852

1183

if(ret == -1){

1853

perror_plus("sigaction");

1854

exitcode = EX_OSERR;

1184

perror("sigaction");

1185

exitcode = EXIT_FAILURE;

1855

1186

goto end;

1856

1187

}

1857

1188

}

1858

1189

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

1859

1190

if(ret == -1){

1860

perror_plus("sigaction");

1861

return EX_OSERR;

1191

perror("sigaction");

1192

return EXIT_FAILURE;

1862

1193

}

1863

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1864

1195

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

1865

1196

if(ret == -1){

1866

perror_plus("sigaction");

1867

exitcode = EX_OSERR;

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1868

1199

goto end;

1869

1200

}

1870

1201

}

1871

1202

1872

1203

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

1873

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

1204

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

1874

1205

if_index = (AvahiIfIndex) if_nametoindex(interface);

1875

1206

if(if_index == 0){

1876

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

1877

exitcode = EX_UNAVAILABLE;

1207

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

1208

exitcode = EXIT_FAILURE;

1878

1209

goto end;

1879

1210

}

1880

1211

1886

1217

errno = 0;

1887

1218

ret = seteuid(0);

1888

1219

if(ret == -1){

1889

perror_plus("seteuid");

1220

perror("seteuid");

1890

1221

}

1891

1222

1892

1223

#ifdef __linux__

1893

1224

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1894

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

1225

messages to mess up the prompt */

1895

1226

ret = klogctl(8, NULL, 5);

1896

1227

bool restore_loglevel = true;

1897

1228

if(ret == -1){

1898

1229

restore_loglevel = false;

1899

perror_plus("klogctl");

1230

perror("klogctl");

1900

1231

}

1901

1232

#endif /* __linux__ */

1902

1233

1903

1234

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1904

1235

if(sd < 0){

1905

perror_plus("socket");

1906

exitcode = EX_OSERR;

1236

perror("socket");

1237

exitcode = EXIT_FAILURE;

1907

1238

#ifdef __linux__

1908

1239

if(restore_loglevel){

1909

1240

ret = klogctl(7, NULL, 0);

1910

1241

if(ret == -1){

1911

perror_plus("klogctl");

1242

perror("klogctl");

1912

1243

}

1913

1244

}

1914

1245

#endif /* __linux__ */

1916

1247

errno = 0;

1917

1248

ret = seteuid(uid);

1918

1249

if(ret == -1){

1919

perror_plus("seteuid");

1250

perror("seteuid");

1920

1251

}

1921

1252

goto end;

1922

1253

}

1923

1254

strcpy(network.ifr_name, interface);

1924

1255

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

1925

1256

if(ret == -1){

1926

perror_plus("ioctl SIOCGIFFLAGS");

1257

perror("ioctl SIOCGIFFLAGS");

1927

1258

#ifdef __linux__

1928

1259

if(restore_loglevel){

1929

1260

ret = klogctl(7, NULL, 0);

1930

1261

if(ret == -1){

1931

perror_plus("klogctl");

1262

perror("klogctl");

1932

1263

}

1933

1264

}

1934

1265

#endif /* __linux__ */

1935

exitcode = EX_OSERR;

1266

exitcode = EXIT_FAILURE;

1936

1267

/* Lower privileges */

1937

1268

errno = 0;

1938

1269

ret = seteuid(uid);

1939

1270

if(ret == -1){

1940

perror_plus("seteuid");

1271

perror("seteuid");

1941

1272

}

1942

1273

goto end;

1943

1274

}

1947

1278

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

1948

1279

if(ret == -1){

1949

1280

take_down_interface = false;

1950

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1951

exitcode = EX_OSERR;

1281

perror("ioctl SIOCSIFFLAGS");

1282

exitcode = EXIT_FAILURE;

1952

1283

#ifdef __linux__

1953

1284

if(restore_loglevel){

1954

1285

ret = klogctl(7, NULL, 0);

1955

1286

if(ret == -1){

1956

perror_plus("klogctl");

1287

perror("klogctl");

1957

1288

}

1958

1289

}

1959

1290

#endif /* __linux__ */

1961

1292

errno = 0;

1962

1293

ret = seteuid(uid);

1963

1294

if(ret == -1){

1964

perror_plus("seteuid");

1295

perror("seteuid");

1965

1296

}

1966

1297

goto end;

1967

1298

}

1968

1299

}

1969

/* Sleep checking until interface is running.

1970

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

1300

/* sleep checking until interface is running */

1971

1301

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

1972

1302

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

1973

1303

if(ret == -1){

1974

perror_plus("ioctl SIOCGIFFLAGS");

1304

perror("ioctl SIOCGIFFLAGS");

1975

1305

} else if(network.ifr_flags & IFF_RUNNING){

1976

1306

break;

1977

1307

}

1978

1308

struct timespec sleeptime = { .tv_nsec = 250000000 };

1979

1309

ret = nanosleep(&sleeptime, NULL);

1980

1310

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

1981

perror_plus("nanosleep");

1311

perror("nanosleep");

1982

1312

}

1983

1313

}

1984

1314

if(not take_down_interface){

1985

1315

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

1986

1316

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

1987

1317

if(ret == -1){

1988

perror_plus("close");

1318

perror("close");

1989

1319

}

1990

1320

}

1991

1321

#ifdef __linux__

1993

1323

/* Restores kernel loglevel to default */

1994

1324

ret = klogctl(7, NULL, 0);

1995

1325

if(ret == -1){

1996

perror_plus("klogctl");

1326

perror("klogctl");

1997

1327

}

1998

1328

}

1999

1329

#endif /* __linux__ */

2000

1330

/* Lower privileges */

2001

1331

errno = 0;

2002

/* Lower privileges */

2003

ret = seteuid(uid);

2004

if(ret == -1){

2005

perror_plus("seteuid");

1332

if(take_down_interface){

1333

/* Lower privileges */

1334

ret = seteuid(uid);

1335

if(ret == -1){

1336

perror("seteuid");

1337

}

1338

} else {

1339

/* Lower privileges permanently */

1340

ret = setuid(uid);

1341

if(ret == -1){

1342

perror("setuid");

1343

}

2006

1344

}

2007

1345

}

2008

1346

2012

1350

2013

1351

ret = init_gnutls_global(pubkey, seckey);

2014

1352

if(ret == -1){

2015

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

2016

exitcode = EX_UNAVAILABLE;

1353

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

1354

exitcode = EXIT_FAILURE;

2017

1355

goto end;

2018

1356

} else {

2019

1357

gnutls_initialized = true;

2023

1361

goto end;

2024

1362

}

2025

1363

1364

tempdir_created = true;

2026

1365

if(mkdtemp(tempdir) == NULL){

2027

perror_plus("mkdtemp");

1366

tempdir_created = false;

1367

perror("mkdtemp");

2028

1368

goto end;

2029

1369

}

2030

tempdir_created = true;

2031

1370

2032

1371

if(quit_now){

2033

1372

goto end;

2034

1373

}

2035

1374

2036

1375

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

2037

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

2038

exitcode = EX_UNAVAILABLE;

1376

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

1377

exitcode = EXIT_FAILURE;

2039

1378

goto end;

2040

1379

} else {

2041

1380

gpgme_initialized = true;

2050

1389

/* (Mainly meant for debugging) */

2051

1390

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

2052

1391

if(address == NULL){

2053

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

2054

exitcode = EX_USAGE;

1392

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

1393

exitcode = EXIT_FAILURE;

2055

1394

goto end;

2056

1395

}

2057

1396

2064

1403

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

2065

1404

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

2066

1405

or tmpmax != (uint16_t)tmpmax){

2067

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

2068

exitcode = EX_USAGE;

1406

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

1407

exitcode = EXIT_FAILURE;

2069

1408

goto end;

2070

1409

}

2071

1410

2075

1414

2076

1415

port = (uint16_t)tmpmax;

2077

1416

*address = '\0';

1417

address = connect_to;

2078

1418

/* Colon in address indicates IPv6 */

2079

1419

int af;

2080

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

1420

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

2081

1421

af = AF_INET6;

2082

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

2083

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

2084

{

2085

connect_to++;

2086

address[-1] = '\0';

2087

}

2088

1422

} else {

2089

1423

af = AF_INET;

2090

1424

}

2091

address = connect_to;

2092

1425

2093

1426

if(quit_now){

2094

1427

goto end;

2095

1428

}

2096

1429

2097

while(not quit_now){

2098

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

2099

if(quit_now or ret == 0){

2100

break;

2101

}

2102

if(debug){

2103

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

2104

(int)retry_interval);

2105

}

2106

sleep((int)retry_interval);

2107

}

2108

2109

if (not quit_now){

1430

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

1431

if(ret < 0){

1432

exitcode = EXIT_FAILURE;

1433

} else {

2110

1434

exitcode = EXIT_SUCCESS;

2111

1435

}

2112

2113

1436

goto end;

2114

1437

}

2115

1438

2137

1460

2138

1461

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

2139

1462

if(mc.server == NULL){

2140

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

2141

avahi_strerror(error));

2142

exitcode = EX_UNAVAILABLE;

1463

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

1464

avahi_strerror(error));

1465

exitcode = EXIT_FAILURE;

2143

1466

goto end;

2144

1467

}

2145

1468

2152

1475

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2153

1476

NULL, 0, browse_callback, NULL);

2154

1477

if(sb == NULL){

2155

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

2156

avahi_strerror(avahi_server_errno(mc.server)));

2157

exitcode = EX_UNAVAILABLE;

1478

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

1479

avahi_strerror(avahi_server_errno(mc.server)));

1480

exitcode = EXIT_FAILURE;

2158

1481

goto end;

2159

1482

}

2160

1483

2165

1488

/* Run the main loop */

2166

1489

2167

1490

if(debug){

2168

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

2169

}

2170

2171

ret = avahi_loop_with_timeout(mc.simple_poll,

2172

(int)(retry_interval * 1000));

2173

if(debug){

2174

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

2175

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

2176

}

1491

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

1492

}

1493

1494

avahi_simple_poll_loop(mc.simple_poll);

2177

1495

2178

1496

end:

2179

1497

2180

1498

if(debug){

2181

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

1499

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

2182

1500

}

2183

1501

2184

1502

/* Cleanup things */

2200

1518

if(gpgme_initialized){

2201

1519

gpgme_release(mc.ctx);

2202

1520

}

2203

2204

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

2205

has seen */

2206

if(mc.current_server != NULL){

2207

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

2208

while(mc.current_server != NULL){

2209

server *next = mc.current_server->next;

2210

free(mc.current_server);

2211

mc.current_server = next;

2212

}

2213

}

2214

1521

2215

/* Re-raise priviliges */

2216

{

2217

if(getuid() == 0){

2218

errno = 0;

2219

ret = seteuid(0);

2220

if(ret == -1){

2221

perror_plus("seteuid");

2222

}

2223

}

2224

/* Run network hooks */

2225

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

2226

goto end;

2227

}

2228

2229

/* Take down the network interface */

2230

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

1522

/* Take down the network interface */

1523

if(take_down_interface){

1524

/* Re-raise priviliges */

1525

errno = 0;

1526

ret = seteuid(0);

1527

if(ret == -1){

1528

perror("seteuid");

1529

}

1530

if(geteuid() == 0){

2231

1531

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

2232

1532

if(ret == -1){

2233

perror_plus("ioctl SIOCGIFFLAGS");

2234

} else if(network.ifr_flags & IFF_UP){

2235

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

1533

perror("ioctl SIOCGIFFLAGS");

1534

} else if(network.ifr_flags & IFF_UP) {

1535

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

2236

1536

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

2237

1537

if(ret == -1){

2238

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1538

perror("ioctl SIOCSIFFLAGS");

2239

1539

}

2240

1540

}

2241

1541

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

2242

1542

if(ret == -1){

2243

perror_plus("close");

2244

}

2245

}

2246

}

2247

if(getuid() == 0){

2248

/* Lower privileges permanently */

2249

errno = 0;

2250

ret = setuid(uid);

2251

if(ret == -1){

2252

perror_plus("setuid");

1543

perror("close");

1544

}

1545

/* Lower privileges permanently */

1546

errno = 0;

1547

ret = setuid(uid);

1548

if(ret == -1){

1549

perror("setuid");

1550

}

2253

1551

}

2254

1552

}

2255

1553

2256

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

1554

/* Removes the temp directory used by GPGME */

2257

1555

if(tempdir_created){

2258

struct dirent **direntries = NULL;

2259

struct dirent *direntry = NULL;

2260

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

2261

alphasort);

2262

if (numentries > 0){

2263

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

2264

direntry = direntries[i];

1556

DIR *d;

1557

struct dirent *direntry;

1558

d = opendir(tempdir);

1559

if(d == NULL){

1560

if(errno != ENOENT){

1561

perror("opendir");

1562

}

1563

} else {

1564

while(true){

1565

direntry = readdir(d);

1566

if(direntry == NULL){

1567

break;

1568

}

1569

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

1570

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

1571

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

1572

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

1573

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

1574

continue;

1575

}

2265

1576

char *fullname = NULL;

2266

1577

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

2267

1578

direntry->d_name);

2268

1579

if(ret < 0){

2269

perror_plus("asprintf");

1580

perror("asprintf");

2270

1581

continue;

2271

1582

}

2272

1583

ret = remove(fullname);

2273

1584

if(ret == -1){

2274

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

2275

strerror(errno));

1585

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

1586

strerror(errno));

2276

1587

}

2277

1588

free(fullname);

2278

1589

}

2279

}

2280

2281

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

2282

free(direntries);

2283

if (numentries == -1){

2284

perror_plus("scandir");

1590

closedir(d);

2285

1591

}

2286

1592

ret = rmdir(tempdir);

2287

1593

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

2288

perror_plus("rmdir");

1594

perror("rmdir");

2289

1595

}

2290

1596

}

2291

1597

2292

1598

if(quit_now){

2293

1599

sigemptyset(&old_sigterm_action.sa_mask);

2294

1600

old_sigterm_action.sa_handler = SIG_DFL;

2295

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2296

&old_sigterm_action,

2297

NULL));

1601

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

2298

1602

if(ret == -1){

2299

perror_plus("sigaction");

2300

}

2301

do {

2302

ret = raise(signal_received);

2303

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

2304

if(ret != 0){

2305

perror_plus("raise");

2306

abort();

2307

}

2308

TEMP_FAILURE_RETRY(pause());

1603

perror("sigaction");

1604

}

1605

raise(signal_received);

2309

1606

}

2310

1607

2311

1608

return exitcode;