/mandos/trunk : revision 505.3.25

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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32

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

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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, EXIT_FAILURE,

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srand(), strtof() */

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

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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() */

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

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

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inet_pton(), connect() */

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

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

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strtoimax() */

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

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

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

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

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program_invocation_short_name */

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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INET_ADDRSTRLEN, INET6_ADDRSTRLEN

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73

*/

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74

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

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getuid(), getgid(), setuid(),

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setgid() */

76

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

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

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

77

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

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78

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

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

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80

argp_state, struct argp,

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83

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

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sigaction(), SIGTERM, sig_atomic_t,

84

85

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(),

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WEXITSTATUS(), WTERMSIG() */

90

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

85

91

86

92

#ifdef __linux__

87

93

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

105

111

init_gnutls_session(),

106

112

GNUTLS_* */

107

113

#include <gnutls/openpgp.h>

108

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

110

116

111

117

/* GPGME */

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118

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

120

126

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

121

127

#define SECKEY "seckey.txt"

122

128

#define PUBKEY "pubkey.txt"

129

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

123

130

124

131

bool debug = false;

125

132

static const char mandos_protocol_version[] = "1";

126

133

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

127

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

134

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

135

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

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

139

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

140

typedef struct server{

141

const char *ip;

142

uint16_t port;

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AvahiIfIndex if_index;

144

int af;

145

struct timespec last_seen;

146

struct server *next;

147

struct server *prev;

148

} server;

128

149

129

150

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

130

151

typedef struct {

135

156

gnutls_dh_params_t dh_params;

136

157

const char *priority;

137

158

gpgme_ctx_t ctx;

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server *current_server;

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160

} mandos_context;

139

161

140

162

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

141

163

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

142

164

.dh_bits = 1024, .priority = "SECURE256"

143

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

165

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

166

.current_server = NULL };

167

168

sig_atomic_t quit_now = 0;

169

int signal_received = 0;

170

171

/* Function to use when printing errors */

172

void perror_plus(const char *print_text){

173

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

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program_invocation_short_name);

175

perror(print_text);

176

}

177

178

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

179

va_list ap;

180

va_start (ap, format);

181

182

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

183

program_invocation_short_name));

184

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

185

}

144

186

145

187

/*

146

188

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

148

190

* "buffer_length" is how much is already used.

149

191

*/

150

192

size_t incbuffer(char **buffer, size_t buffer_length,

151

size_t buffer_capacity){

193

size_t buffer_capacity){

152

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

153

195

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

154

196

if(buffer == NULL){

159

201

return buffer_capacity;

160

202

}

161

203

204

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

205

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

206

int af){

207

int ret;

208

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

209

if(new_server == NULL){

210

perror_plus("malloc");

211

return -1;

212

}

213

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

214

.port = port,

215

.if_index = if_index,

216

.af = af };

217

if(new_server->ip == NULL){

218

perror_plus("strdup");

219

return -1;

220

}

221

/* Special case of first server */

222

if (mc.current_server == NULL){

223

new_server->next = new_server;

224

new_server->prev = new_server;

225

mc.current_server = new_server;

226

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

227

} else {

228

new_server->next = mc.current_server;

229

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

230

new_server->prev->next = new_server;

231

mc.current_server->prev = new_server;

232

}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return -1;

237

}

238

return 0;

239

}

240

162

241

/*

163

242

* Initialize GPGME.

164

243

*/

165

static bool init_gpgme(const char *seckey,

166

const char *pubkey, const char *tempdir){

244

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

245

const char *tempdir){

167

246

gpgme_error_t rc;

168

247

gpgme_engine_info_t engine_info;

169

248

178

257

179

258

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

180

259

if(fd == -1){

181

perror("open");

260

perror_plus("open");

182

261

return false;

183

262

}

184

263

185

264

rc = gpgme_data_new_from_fd(&pgp_data, fd);

186

265

if(rc != GPG_ERR_NO_ERROR){

187

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

188

gpgme_strsource(rc), gpgme_strerror(rc));

266

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

267

gpgme_strsource(rc), gpgme_strerror(rc));

189

268

return false;

190

269

}

191

270

192

271

rc = gpgme_op_import(mc.ctx, pgp_data);

193

272

if(rc != GPG_ERR_NO_ERROR){

194

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

195

gpgme_strsource(rc), gpgme_strerror(rc));

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

196

275

return false;

197

276

}

198

277

199

278

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

200

279

if(ret == -1){

201

perror("close");

280

perror_plus("close");

202

281

}

203

282

gpgme_data_release(pgp_data);

204

283

return true;

205

284

}

206

285

207

286

if(debug){

208

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

287

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

209

288

}

210

289

211

290

/* Init GPGME */

212

291

gpgme_check_version(NULL);

213

292

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

214

293

if(rc != GPG_ERR_NO_ERROR){

215

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

216

gpgme_strsource(rc), gpgme_strerror(rc));

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

217

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return false;

218

297

}

219

298

220

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

299

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

221

300

rc = gpgme_get_engine_info(&engine_info);

222

301

if(rc != GPG_ERR_NO_ERROR){

223

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

224

gpgme_strsource(rc), gpgme_strerror(rc));

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

225

304

return false;

226

305

}

227

306

while(engine_info != NULL){

233

312

engine_info = engine_info->next;

234

313

}

235

314

if(engine_info == NULL){

236

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

315

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

316

tempdir);

237

317

return false;

238

318

}

239

319

240

320

/* Create new GPGME "context" */

241

321

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

242

322

if(rc != GPG_ERR_NO_ERROR){

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

323

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

324

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

325

gpgme_strerror(rc));

245

326

return false;

246

327

}

247

328

266

347

ssize_t plaintext_length = 0;

267

348

268

349

if(debug){

269

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

350

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

270

351

}

271

352

272

353

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

273

354

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

274

355

0);

275

356

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

278

359

return -1;

279

360

}

280

361

281

362

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

282

363

rc = gpgme_data_new(&dh_plain);

283

364

if(rc != GPG_ERR_NO_ERROR){

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

286

368

gpgme_data_release(dh_crypto);

287

369

return -1;

288

370

}

291

373

data buffer */

292

374

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

293

375

if(rc != GPG_ERR_NO_ERROR){

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

296

378

plaintext_length = -1;

297

379

if(debug){

298

380

gpgme_decrypt_result_t result;

299

381

result = gpgme_op_decrypt_result(mc.ctx);

300

382

if(result == NULL){

301

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

383

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

302

384

} else {

303

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

304

result->unsupported_algorithm);

305

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

306

result->wrong_key_usage);

385

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

386

result->unsupported_algorithm);

387

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

388

result->wrong_key_usage);

307

389

if(result->file_name != NULL){

308

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

390

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

309

391

}

310

392

gpgme_recipient_t recipient;

311

393

recipient = result->recipients;

312

394

while(recipient != NULL){

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");

395

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

396

gpgme_pubkey_algo_name

397

(recipient->pubkey_algo));

398

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

399

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

400

recipient->status == GPG_ERR_NO_SECKEY

401

? "No" : "Yes");

319

402

recipient = recipient->next;

320

403

}

321

404

}

324

407

}

325

408

326

409

if(debug){

327

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

410

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

328

411

}

329

412

330

413

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

331

414

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

332

perror("gpgme_data_seek");

415

perror_plus("gpgme_data_seek");

333

416

plaintext_length = -1;

334

417

goto decrypt_end;

335

418

}

337

420

*plaintext = NULL;

338

421

while(true){

339

422

plaintext_capacity = incbuffer(plaintext,

340

(size_t)plaintext_length,

341

plaintext_capacity);

423

(size_t)plaintext_length,

424

plaintext_capacity);

342

425

if(plaintext_capacity == 0){

343

perror("incbuffer");

344

plaintext_length = -1;

345

goto decrypt_end;

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

346

429

}

347

430

348

431

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

353

436

break;

354

437

}

355

438

if(ret < 0){

356

perror("gpgme_data_read");

439

perror_plus("gpgme_data_read");

357

440

plaintext_length = -1;

358

441

goto decrypt_end;

359

442

}

361

444

}

362

445

363

446

if(debug){

364

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

447

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

365

448

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

366

449

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

367

450

}

389

472

/* GnuTLS log function callback */

390

473

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

391

474

const char* string){

392

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

475

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

393

476

}

394

477

395

478

static int init_gnutls_global(const char *pubkeyfilename,

397

480

int ret;

398

481

399

482

if(debug){

400

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

483

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

401

484

}

402

485

403

486

ret = gnutls_global_init();

404

487

if(ret != GNUTLS_E_SUCCESS){

405

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

406

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

407

490

return -1;

408

491

}

409

492

416

499

}

417

500

418

501

/* OpenPGP credentials */

419

gnutls_certificate_allocate_credentials(&mc.cred);

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

420

503

if(ret != GNUTLS_E_SUCCESS){

421

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

422

from

423

-Wunreachable-code

424

*/

425

safer_gnutls_strerror(ret));

504

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

505

safer_gnutls_strerror(ret));

426

506

gnutls_global_deinit();

427

507

return -1;

428

508

}

429

509

430

510

if(debug){

431

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

432

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

433

seckeyfilename);

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

434

515

}

435

516

436

517

ret = gnutls_certificate_set_openpgp_key_file

437

518

(mc.cred, pubkeyfilename, seckeyfilename,

438

519

GNUTLS_OPENPGP_FMT_BASE64);

439

520

if(ret != GNUTLS_E_SUCCESS){

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));

521

fprintf_plus(stderr,

522

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

523

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

524

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

525

safer_gnutls_strerror(ret));

445

526

goto globalfail;

446

527

}

447

528

448

529

/* GnuTLS server initialization */

449

530

ret = gnutls_dh_params_init(&mc.dh_params);

450

531

if(ret != GNUTLS_E_SUCCESS){

451

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

452

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

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

453

535

goto globalfail;

454

536

}

455

537

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

456

538

if(ret != GNUTLS_E_SUCCESS){

457

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

458

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

459

541

goto globalfail;

460

542

}

461

543

474

556

static int init_gnutls_session(gnutls_session_t *session){

475

557

int ret;

476

558

/* GnuTLS session creation */

477

ret = gnutls_init(session, GNUTLS_SERVER);

559

do {

560

ret = gnutls_init(session, GNUTLS_SERVER);

561

if(quit_now){

562

return -1;

563

}

564

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

478

565

if(ret != GNUTLS_E_SUCCESS){

479

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

480

safer_gnutls_strerror(ret));

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

481

569

}

482

570

483

571

{

484

572

const char *err;

485

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

573

do {

574

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

575

if(quit_now){

576

gnutls_deinit(*session);

577

return -1;

578

}

579

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

486

580

if(ret != GNUTLS_E_SUCCESS){

487

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

488

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

489

safer_gnutls_strerror(ret));

581

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

582

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

583

safer_gnutls_strerror(ret));

490

584

gnutls_deinit(*session);

491

585

return -1;

492

586

}

493

587

}

494

588

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

589

do {

590

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

591

mc.cred);

592

if(quit_now){

593

gnutls_deinit(*session);

594

return -1;

595

}

596

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

497

597

if(ret != GNUTLS_E_SUCCESS){

498

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

499

safer_gnutls_strerror(ret));

598

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

599

safer_gnutls_strerror(ret));

500

600

gnutls_deinit(*session);

501

601

return -1;

502

602

}

503

603

504

604

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

605

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

606

508

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

608

514

613

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

515

614

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

516

615

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

520

616

/* Called when a Mandos server is found */

521

617

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

522

618

AvahiIfIndex if_index,

528

624

struct sockaddr_in6 in6;

529

625

} to;

530

626

char *buffer = NULL;

531

char *decrypted_buffer;

627

char *decrypted_buffer = NULL;

532

628

size_t buffer_length = 0;

533

629

size_t buffer_capacity = 0;

534

630

size_t written;

535

int retval = 0;

631

int retval = -1;

536

632

gnutls_session_t session;

537

633

int pf; /* Protocol family */

538

634

635

errno = 0;

636

539

637

if(quit_now){

638

errno = EINTR;

540

639

return -1;

541

640

}

542

641

548

647

pf = PF_INET;

549

648

break;

550

649

default:

551

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

650

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

651

errno = EINVAL;

552

652

return -1;

553

653

}

554

654

558

658

}

559

659

560

660

if(debug){

561

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

562

"\n", ip, port);

661

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

662

PRIu16 "\n", ip, port);

563

663

}

564

664

565

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

566

666

if(tcp_sd < 0){

567

perror("socket");

568

retval = -1;

667

int e = errno;

668

perror_plus("socket");

669

errno = e;

569

670

goto mandos_end;

570

671

}

571

672

572

673

if(quit_now){

674

errno = EINTR;

573

675

goto mandos_end;

574

676

}

575

677

582

684

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

583

685

}

584

686

if(ret < 0 ){

585

perror("inet_pton");

586

retval = -1;

687

int e = errno;

688

perror_plus("inet_pton");

689

errno = e;

587

690

goto mandos_end;

588

691

}

589

692

if(ret == 0){

590

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

591

retval = -1;

693

int e = errno;

694

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

695

errno = e;

592

696

goto mandos_end;

593

697

}

594

698

if(af == AF_INET6){

598

702

599

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

600

704

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

601

-Wunreachable-code*/

705

-Wunreachable-code*/

602

706

if(if_index == AVAHI_IF_UNSPEC){

603

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

604

" without a network interface\n");

605

retval = -1;

707

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

708

" incomplete without a network interface\n");

709

errno = EINVAL;

606

710

goto mandos_end;

607

711

}

608

712

/* Set the network interface number as scope */

615

719

}

616

720

617

721

if(quit_now){

722

errno = EINTR;

618

723

goto mandos_end;

619

724

}

620

725

622

727

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

623

728

char interface[IF_NAMESIZE];

624

729

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

625

perror("if_indextoname");

730

perror_plus("if_indextoname");

626

731

} else {

627

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

628

ip, interface, port);

732

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

733

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

629

734

}

630

735

} else {

631

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

632

port);

736

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

737

ip, port);

633

738

}

634

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

635

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

642

747

sizeof(addrstr));

643

748

}

644

749

if(pcret == NULL){

645

perror("inet_ntop");

750

perror_plus("inet_ntop");

646

751

} else {

647

752

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

648

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

753

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

649

754

}

650

755

}

651

756

}

652

757

653

758

if(quit_now){

759

errno = EINTR;

654

760

goto mandos_end;

655

761

}

656

762

660

766

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

661

767

}

662

768

if(ret < 0){

663

perror("connect");

664

retval = -1;

769

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

770

int e = errno;

771

perror_plus("connect");

772

errno = e;

773

}

665

774

goto mandos_end;

666

775

}

667

776

668

777

if(quit_now){

778

errno = EINTR;

669

779

goto mandos_end;

670

780

}

671

781

674

784

while(true){

675

785

size_t out_size = strlen(out);

676

786

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

677

out_size - written));

787

out_size - written));

678

788

if(ret == -1){

679

perror("write");

680

retval = -1;

789

int e = errno;

790

perror_plus("write");

791

errno = e;

681

792

goto mandos_end;

682

793

}

683

794

written += (size_t)ret;

693

804

}

694

805

695

806

if(quit_now){

807

errno = EINTR;

696

808

goto mandos_end;

697

809

}

698

810

}

699

811

700

812

if(debug){

701

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

813

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

702

814

}

703

815

704

816

if(quit_now){

817

errno = EINTR;

705

818

goto mandos_end;

706

819

}

707

820

821

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

708

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

709

823

710

824

if(quit_now){

825

errno = EINTR;

711

826

goto mandos_end;

712

827

}

713

828

714

829

do {

715

830

ret = gnutls_handshake(session);

716

831

if(quit_now){

832

errno = EINTR;

717

833

goto mandos_end;

718

834

}

719

835

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

720

836

721

837

if(ret != GNUTLS_E_SUCCESS){

722

838

if(debug){

723

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

839

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

724

840

gnutls_perror(ret);

725

841

}

726

retval = -1;

842

errno = EPROTO;

727

843

goto mandos_end;

728

844

}

729

845

730

846

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

731

847

732

848

if(debug){

733

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

734

ip);

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

735

851

}

736

852

737

853

while(true){

738

854

739

855

if(quit_now){

856

errno = EINTR;

740

857

goto mandos_end;

741

858

}

742

859

743

860

buffer_capacity = incbuffer(&buffer, buffer_length,

744

buffer_capacity);

861

buffer_capacity);

745

862

if(buffer_capacity == 0){

746

perror("incbuffer");

747

retval = -1;

863

int e = errno;

864

perror_plus("incbuffer");

865

errno = e;

748

866

goto mandos_end;

749

867

}

750

868

751

869

if(quit_now){

870

errno = EINTR;

752

871

goto mandos_end;

753

872

}

754

873

767

886

ret = gnutls_handshake(session);

768

887

769

888

if(quit_now){

889

errno = EINTR;

770

890

goto mandos_end;

771

891

}

772

892

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

773

893

if(ret < 0){

774

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

894

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

895

"***\n");

775

896

gnutls_perror(ret);

776

retval = -1;

897

errno = EPROTO;

777

898

goto mandos_end;

778

899

}

779

900

break;

780

901

default:

781

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

782

" encrypted session with Mandos server\n");

783

retval = -1;

902

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

903

" encrypted session with Mandos server\n");

784

904

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

errno = EIO;

785

906

goto mandos_end;

786

907

}

787

908

} else {

790

911

}

791

912

792

913

if(debug){

793

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

794

}

795

796

if(quit_now){

797

goto mandos_end;

798

}

799

800

gnutls_bye(session, GNUTLS_SHUT_RDWR);

801

802

if(quit_now){

803

goto mandos_end;

804

}

914

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

915

}

916

917

if(quit_now){

918

errno = EINTR;

919

goto mandos_end;

920

}

921

922

do {

923

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

924

if(quit_now){

925

errno = EINTR;

926

goto mandos_end;

927

}

928

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

805

929

806

930

if(buffer_length > 0){

807

931

ssize_t decrypted_buffer_size;

808

decrypted_buffer_size = pgp_packet_decrypt(buffer,

809

buffer_length,

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

810

933

&decrypted_buffer);

811

934

if(decrypted_buffer_size >= 0){

812

935

813

936

written = 0;

814

937

while(written < (size_t) decrypted_buffer_size){

815

938

if(quit_now){

939

errno = EINTR;

816

940

goto mandos_end;

817

941

}

818

942

820

944

(size_t)decrypted_buffer_size - written,

821

945

stdout);

822

946

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

947

int e = errno;

823

948

if(debug){

824

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

825

strerror(errno));

949

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

950

strerror(errno));

826

951

}

827

retval = -1;

828

break;

952

errno = e;

953

goto mandos_end;

829

954

}

830

955

written += (size_t)ret;

831

956

}

832

free(decrypted_buffer);

833

} else {

834

retval = -1;

957

retval = 0;

835

958

}

836

} else {

837

retval = -1;

838

959

}

839

960

840

961

/* Shutdown procedure */

841

962

842

963

mandos_end:

843

free(buffer);

844

if(tcp_sd >= 0){

845

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

846

}

847

if(ret == -1){

848

perror("close");

849

}

850

gnutls_deinit(session);

851

if(quit_now){

852

retval = -1;

964

{

965

int e = errno;

966

free(decrypted_buffer);

967

free(buffer);

968

if(tcp_sd >= 0){

969

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

970

}

971

if(ret == -1){

972

if(e == 0){

973

e = errno;

974

}

975

perror_plus("close");

976

}

977

gnutls_deinit(session);

978

errno = e;

979

if(quit_now){

980

errno = EINTR;

981

retval = -1;

982

}

853

983

}

854

984

return retval;

855

985

}

880

1010

switch(event){

881

1011

default:

882

1012

case AVAHI_RESOLVER_FAILURE:

883

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

884

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

885

avahi_strerror(avahi_server_errno(mc.server)));

1013

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

1014

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

1015

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

886

1017

break;

887

1018

888

1019

case AVAHI_RESOLVER_FOUND:

890

1021

char ip[AVAHI_ADDRESS_STR_MAX];

891

1022

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

892

1023

if(debug){

893

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

894

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

895

ip, (intmax_t)interface, port);

1024

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

1025

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

1026

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

896

1027

}

897

1028

int ret = start_mandos_communication(ip, port, interface,

898

1029

avahi_proto_to_af(proto));

899

1030

if(ret == 0){

900

1031

avahi_simple_poll_quit(mc.simple_poll);

1032

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

901

1035

}

902

1036

}

903

1037

}

927

1061

default:

928

1062

case AVAHI_BROWSER_FAILURE:

929

1063

930

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

931

avahi_strerror(avahi_server_errno(mc.server)));

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

932

1066

avahi_simple_poll_quit(mc.simple_poll);

933

1067

return;

934

1068

941

1075

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

942

1076

name, type, domain, protocol, 0,

943

1077

resolve_callback, NULL) == NULL)

944

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

945

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

1078

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

1079

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

946

1081

break;

947

1082

948

1083

case AVAHI_BROWSER_REMOVE:

951

1086

case AVAHI_BROWSER_ALL_FOR_NOW:

952

1087

case AVAHI_BROWSER_CACHE_EXHAUSTED:

953

1088

if(debug){

954

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

1089

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

1090

" searching...\n");

955

1091

}

956

1092

break;

957

1093

}

958

1094

}

959

1095

960

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

1096

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

961

1097

static void handle_sigterm(int sig){

962

1098

if(quit_now){

963

1099

return;

965

1101

quit_now = 1;

966

1102

signal_received = sig;

967

1103

int old_errno = errno;

1104

/* set main loop to exit */

968

1105

if(mc.simple_poll != NULL){

969

1106

avahi_simple_poll_quit(mc.simple_poll);

970

1107

}

971

1108

errno = old_errno;

972

1109

}

973

1110

1111

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

1112

int ret;

1113

1114

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

1115

if(s < 0){

1116

perror_plus("socket");

1117

return false;

1118

}

1119

strcpy(ifr->ifr_name, ifname);

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

if(ret == -1){

1122

if(debug){

1123

perror_plus("ioctl SIOCGIFFLAGS");

1124

}

1125

return false;

1126

}

1127

return true;

1128

}

1129

1130

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

1131

1132

/* Reject the loopback device */

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1134

if(debug){

1135

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

1136

ifname);

1137

}

1138

return false;

1139

}

1140

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

1141

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

1142

if(debug){

1143

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

1144

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

1145

}

1146

return true;

1147

}

1148

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

1149

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

1150

if(debug){

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1153

}

1154

return false;

1155

}

1156

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

1157

if(ifr->ifr_flags & IFF_NOARP){

1158

if(debug){

1159

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

1160

ifname);

1161

}

1162

return false;

1163

}

1164

1165

/* Accept this device */

1166

if(debug){

1167

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

1168

}

1169

return true;

1170

}

1171

1172

/*

1173

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

1174

* corresponds to an acceptable network device.

1175

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

1176

*/

1177

int good_interface(const struct dirent *if_entry){

1178

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

1179

return 0;

1180

}

1181

1182

struct ifreq ifr;

1183

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

1184

if(debug){

1185

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

1186

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

1187

}

1188

return 0;

1189

}

1190

1191

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

1192

return 0;

1193

}

1194

return 1;

1195

}

1196

1197

/*

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1236

}

1237

return 1;

1238

}

1239

1240

int notdotentries(const struct dirent *direntry){

1241

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

1242

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

1243

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

1244

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

1245

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

1246

return 0;

1247

}

1248

return 1;

1249

}

1250

1251

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

1252

int runnable_hook(const struct dirent *direntry){

1253

int ret;

1254

size_t sret;

1255

struct stat st;

1256

1257

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

1258

/* Empty name? */

1259

return 0;

1260

}

1261

1262

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

1263

"abcdefghijklmnopqrstuvwxyz"

1264

"0123456789"

1265

"_-");

1266

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

1267

/* Contains non-allowed characters */

1268

if(debug){

1269

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

1270

direntry->d_name);

1271

}

1272

return 0;

1273

}

1274

1275

char *fullname = NULL;

1276

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

1277

if(ret < 0){

1278

perror_plus("asprintf");

1279

return 0;

1280

}

1281

1282

ret = stat(fullname, &st);

1283

if(ret == -1){

1284

if(debug){

1285

perror_plus("Could not stat hook");

1286

}

1287

return 0;

1288

}

1289

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

1290

/* Not a regular file */

1291

if(debug){

1292

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

1293

direntry->d_name);

1294

}

1295

return 0;

1296

}

1297

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

1298

/* Not executable */

1299

if(debug){

1300

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

1301

direntry->d_name);

1302

}

1303

return 0;

1304

}

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

return 1;

1310

}

1311

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1313

int ret;

1314

struct timespec now;

1315

struct timespec waited_time;

1316

intmax_t block_time;

1317

1318

while(true){

1319

if(mc.current_server == NULL){

1320

if (debug){

1321

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

1322

" No timeout!\n");

1323

}

1324

ret = avahi_simple_poll_iterate(s, -1);

1325

} else {

1326

if (debug){

1327

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

1328

" it, or wait\n");

1329

}

1330

/* the current time */

1331

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1332

if(ret == -1){

1333

perror_plus("clock_gettime");

1334

return -1;

1335

}

1336

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

1337

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

1338

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1340

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1342

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

1343

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

1344

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

1345

block_time = ((retry_interval

1346

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

1347

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

1348

1349

if (debug){

1350

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

1351

block_time);

1352

}

1353

1354

if(block_time <= 0){

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1359

if(ret == 0){

1360

avahi_simple_poll_quit(mc.simple_poll);

1361

return 0;

1362

}

1363

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1365

if(ret == -1){

1366

perror_plus("clock_gettime");

1367

return -1;

1368

}

1369

mc.current_server = mc.current_server->next;

1370

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

1371

servers, but don't block */

1372

}

1373

1374

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

1375

}

1376

if(ret != 0){

1377

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

1378

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

1379

}

1380

}

1381

}

1382

}

1383

1384

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

1385

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1391

if(numhooks == -1){

1392

perror_plus("scandir");

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

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

1399

if(ret < 0){

1400

perror_plus("asprintf");

1401

continue;

1402

}

1403

if(debug){

1404

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

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

dup2(devnull, STDIN_FILENO);

1435

close(devnull);

1436

dup2(STDERR_FILENO, STDOUT_FILENO);

1437

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

1438

if(ret == -1){

1439

perror_plus("setenv");

1440

_exit(EX_OSERR);

1441

}

1442

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

1443

if(ret == -1){

1444

perror_plus("setenv");

1445

_exit(EX_OSERR);

1446

}

1447

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

1448

if(ret == -1){

1449

perror_plus("setenv");

1450

_exit(EX_OSERR);

1451

}

1452

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

1453

if(ret == -1){

1454

perror_plus("setenv");

1455

_exit(EX_OSERR);

1456

}

1457

char *delaystring;

1458

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

1459

if(ret == -1){

1460

perror_plus("asprintf");

1461

_exit(EX_OSERR);

1462

}

1463

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

1464

if(ret == -1){

1465

free(delaystring);

1466

perror_plus("setenv");

1467

_exit(EX_OSERR);

1468

}

1469

free(delaystring);

1470

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

1471

perror_plus("execl");

1472

} else {

1473

int status;

1474

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

1475

perror_plus("waitpid");

1476

free(fullname);

1477

continue;

1478

}

1479

if(WIFEXITED(status)){

1480

if(WEXITSTATUS(status) != 0){

1481

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

1482

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

1483

WEXITSTATUS(status));

1484

free(fullname);

1485

continue;

1486

}

1487

} else if(WIFSIGNALED(status)){

1488

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

1489

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

1490

WTERMSIG(status));

1491

free(fullname);

1492

continue;

1493

} else {

1494

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

1495

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

1496

free(fullname);

1497

continue;

1498

}

1499

}

1500

free(fullname);

1501

if(debug){

1502

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

1503

direntry->d_name);

1504

}

1505

}

1506

close(devnull);

1507

}

1508

return true;

1509

}

1510

974

1511

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

975

1512

AvahiSServiceBrowser *sb = NULL;

976

1513

int error;

978

1515

intmax_t tmpmax;

979

1516

char *tmp;

980

1517

int exitcode = EXIT_SUCCESS;

981

const char *interface = "eth0";

1518

const char *interface = "";

982

1519

struct ifreq network;

983

1520

int sd = -1;

984

1521

bool take_down_interface = false;

985

1522

uid_t uid;

986

1523

gid_t gid;

987

char *connect_to = NULL;

988

1524

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

989

1525

bool tempdir_created = false;

990

1526

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

994

1530

bool gnutls_initialized = false;

995

1531

bool gpgme_initialized = false;

996

1532

float delay = 2.5f;

1533

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

1534

retrying the same server again */

997

1535

998

struct sigaction old_sigterm_action;

1536

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

999

1537

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1000

1538

1539

uid = getuid();

1540

gid = getgid();

1541

1542

/* Lower any group privileges we might have, just to be safe */

1543

errno = 0;

1544

ret = setgid(gid);

1545

if(ret == -1){

1546

perror_plus("setgid");

1547

}

1548

1549

/* Lower user privileges (temporarily) */

1550

errno = 0;

1551

ret = seteuid(uid);

1552

if(ret == -1){

1553

perror_plus("seteuid");

1554

}

1555

1556

if(quit_now){

1557

goto end;

1558

}

1559

1001

1560

{

1002

1561

struct argp_option options[] = {

1003

1562

{ .name = "debug", .key = 128,

1032

1591

.arg = "SECONDS",

1033

1592

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

1034

1593

.group = 2 },

1594

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

1595

.arg = "SECONDS",

1596

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

1597

.group = 2 },

1598

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

1599

.arg = "DIR",

1600

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

1601

.group = 2 },

1602

/*

1603

* These reproduce what we would get without ARGP_NO_HELP

1604

*/

1605

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

1606

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

1607

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

1608

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

1609

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

1610

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

1035

1611

{ .name = NULL }

1036

1612

};

1037

1613

1038

1614

error_t parse_opt(int key, char *arg,

1039

1615

struct argp_state *state){

1616

errno = 0;

1040

1617

switch(key){

1041

1618

case 128: /* --debug */

1042

1619

debug = true;

1058

1635

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

1059

1636

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

1060

1637

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

1061

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

1062

exit(EXIT_FAILURE);

1638

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

1063

1639

}

1064

1640

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

1065

1641

break;

1070

1646

errno = 0;

1071

1647

delay = strtof(arg, &tmp);

1072

1648

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

1073

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

1074

exit(EXIT_FAILURE);

1075

}

1076

break;

1077

case ARGP_KEY_ARG:

1078

argp_usage(state);

1079

case ARGP_KEY_END:

1649

argp_error(state, "Bad delay");

1650

}

1651

case 132: /* --retry */

1652

errno = 0;

1653

retry_interval = strtod(arg, &tmp);

1654

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

1655

or (retry_interval * 1000) > INT_MAX

1656

or retry_interval < 0){

1657

argp_error(state, "Bad retry interval");

1658

}

1659

break;

1660

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

1661

hookdir = arg;

1662

break;

1663

/*

1664

* These reproduce what we would get without ARGP_NO_HELP

1665

*/

1666

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

1667

argp_state_help(state, state->out_stream,

1668

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1669

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1670

case -3: /* --usage */

1671

argp_state_help(state, state->out_stream,

1672

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

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

1677

exit(argp_err_exit_status);

1080

1678

break;

1081

1679

default:

1082

1680

return ARGP_ERR_UNKNOWN;

1083

1681

}

1084

return 0;

1682

return errno;

1085

1683

}

1086

1684

1087

1685

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

1088

1686

.args_doc = "",

1089

1687

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

1090

1688

" passwords from a Mandos server" };

1091

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

1092

if(ret == ARGP_ERR_UNKNOWN){

1093

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

1094

exitcode = EXIT_FAILURE;

1095

goto end;

1096

}

1689

ret = argp_parse(&argp, argc, argv,

1690

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1691

switch(ret){

1692

case 0:

1693

break;

1694

case ENOMEM:

1695

default:

1696

errno = ret;

1697

perror_plus("argp_parse");

1698

exitcode = EX_OSERR;

1699

goto end;

1700

case EINVAL:

1701

exitcode = EX_USAGE;

1702

goto end;

1703

}

1704

}

1705

1706

{

1707

/* Work around Debian bug #633582:

1708

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

1709

1710

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

1715

} else {

1716

struct stat st;

1717

1718

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

1719

int seckey_fd = open(seckey, O_RDONLY);

1720

if(seckey_fd == -1){

1721

perror_plus("open");

1722

} else {

1723

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

1724

if(ret == -1){

1725

perror_plus("fstat");

1726

} else {

1727

if(S_ISREG(st.st_mode)

1728

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

1729

ret = fchown(seckey_fd, uid, gid);

1730

if(ret == -1){

1731

perror_plus("fchown");

1732

}

1733

}

1734

}

1735

TEMP_FAILURE_RETRY(close(seckey_fd));

1736

}

1737

}

1738

1739

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

1740

int pubkey_fd = open(pubkey, O_RDONLY);

1741

if(pubkey_fd == -1){

1742

perror_plus("open");

1743

} else {

1744

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

1745

if(ret == -1){

1746

perror_plus("fstat");

1747

} else {

1748

if(S_ISREG(st.st_mode)

1749

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

1750

ret = fchown(pubkey_fd, uid, gid);

1751

if(ret == -1){

1752

perror_plus("fchown");

1753

}

1754

}

1755

}

1756

TEMP_FAILURE_RETRY(close(pubkey_fd));

1757

}

1758

}

1759

1760

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

1765

}

1766

}

1767

}

1768

1769

/* Run network hooks */

1770

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

1771

goto end;

1097

1772

}

1098

1773

1099

1774

if(not debug){

1100

1775

avahi_set_log_function(empty_log);

1101

1776

}

1102

1777

1778

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

1779

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

if(ret >= 1){

1790

/* Pick the first interface returned */

1791

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

1792

if(debug){

1793

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

1794

}

1795

if(interface == NULL){

1796

perror_plus("malloc");

1797

free(direntries);

1798

exitcode = EXIT_FAILURE;

1799

goto end;

1800

}

1801

free(direntries);

1802

} else {

1803

free(direntries);

1804

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

1805

exitcode = EXIT_FAILURE;

1806

goto end;

1807

}

1808

}

1809

1103

1810

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

1104

1811

from the signal handler */

1105

1812

/* Initialize the pseudo-RNG for Avahi */

1106

1813

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

1107

1814

mc.simple_poll = avahi_simple_poll_new();

1108

1815

if(mc.simple_poll == NULL){

1109

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

1110

exitcode = EXIT_FAILURE;

1816

fprintf_plus(stderr,

1817

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

1818

exitcode = EX_UNAVAILABLE;

1111

1819

goto end;

1112

1820

}

1113

1821

1114

1822

sigemptyset(&sigterm_action.sa_mask);

1115

1823

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

1116

1824

if(ret == -1){

1117

perror("sigaddset");

1118

exitcode = EXIT_FAILURE;

1825

perror_plus("sigaddset");

1826

exitcode = EX_OSERR;

1119

1827

goto end;

1120

1828

}

1121

1829

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

1122

1830

if(ret == -1){

1123

perror("sigaddset");

1124

exitcode = EXIT_FAILURE;

1831

perror_plus("sigaddset");

1832

exitcode = EX_OSERR;

1125

1833

goto end;

1126

1834

}

1127

1835

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

1128

1836

if(ret == -1){

1129

perror("sigaddset");

1130

exitcode = EXIT_FAILURE;

1837

perror_plus("sigaddset");

1838

exitcode = EX_OSERR;

1131

1839

goto end;

1132

1840

}

1133

1841

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

1136

1844

*/

1137

1845

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

1138

1846

if(ret == -1){

1139

perror("sigaction");

1140

return EXIT_FAILURE;

1847

perror_plus("sigaction");

1848

return EX_OSERR;

1141

1849

}

1142

1850

if(old_sigterm_action.sa_handler != SIG_IGN){

1143

1851

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

1144

1852

if(ret == -1){

1145

perror("sigaction");

1146

exitcode = EXIT_FAILURE;

1853

perror_plus("sigaction");

1854

exitcode = EX_OSERR;

1147

1855

goto end;

1148

1856

}

1149

1857

}

1150

1858

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

1151

1859

if(ret == -1){

1152

perror("sigaction");

1153

return EXIT_FAILURE;

1860

perror_plus("sigaction");

1861

return EX_OSERR;

1154

1862

}

1155

1863

if(old_sigterm_action.sa_handler != SIG_IGN){

1156

1864

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

1157

1865

if(ret == -1){

1158

perror("sigaction");

1159

exitcode = EXIT_FAILURE;

1866

perror_plus("sigaction");

1867

exitcode = EX_OSERR;

1160

1868

goto end;

1161

1869

}

1162

1870

}

1163

1871

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

1164

1872

if(ret == -1){

1165

perror("sigaction");

1166

return EXIT_FAILURE;

1873

perror_plus("sigaction");

1874

return EX_OSERR;

1167

1875

}

1168

1876

if(old_sigterm_action.sa_handler != SIG_IGN){

1169

1877

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

1170

1878

if(ret == -1){

1171

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1879

perror_plus("sigaction");

1880

exitcode = EX_OSERR;

1173

1881

goto end;

1174

1882

}

1175

1883

}

1176

1884

1177

1885

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

1178

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

1886

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

1179

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1180

1888

if(if_index == 0){

1181

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

1182

exitcode = EXIT_FAILURE;

1889

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

1890

exitcode = EX_UNAVAILABLE;

1183

1891

goto end;

1184

1892

}

1185

1893

1187

1895

goto end;

1188

1896

}

1189

1897

1898

/* Re-raise priviliges */

1899

errno = 0;

1900

ret = seteuid(0);

1901

if(ret == -1){

1902

perror_plus("seteuid");

1903

}

1904

1190

1905

#ifdef __linux__

1191

1906

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1192

messages to mess up the prompt */

1907

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

1193

1908

ret = klogctl(8, NULL, 5);

1194

1909

bool restore_loglevel = true;

1195

1910

if(ret == -1){

1196

1911

restore_loglevel = false;

1197

perror("klogctl");

1912

perror_plus("klogctl");

1198

1913

}

1199

1914

#endif /* __linux__ */

1200

1915

1201

1916

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1202

1917

if(sd < 0){

1203

perror("socket");

1204

exitcode = EXIT_FAILURE;

1918

perror_plus("socket");

1919

exitcode = EX_OSERR;

1205

1920

#ifdef __linux__

1206

1921

if(restore_loglevel){

1207

1922

ret = klogctl(7, NULL, 0);

1208

1923

if(ret == -1){

1209

perror("klogctl");

1924

perror_plus("klogctl");

1210

1925

}

1211

1926

}

1212

1927

#endif /* __linux__ */

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1213

1934

goto end;

1214

1935

}

1215

1936

strcpy(network.ifr_name, interface);

1216

1937

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

1217

1938

if(ret == -1){

1218

perror("ioctl SIOCGIFFLAGS");

1939

perror_plus("ioctl SIOCGIFFLAGS");

1219

1940

#ifdef __linux__

1220

1941

if(restore_loglevel){

1221

1942

ret = klogctl(7, NULL, 0);

1222

1943

if(ret == -1){

1223

perror("klogctl");

1944

perror_plus("klogctl");

1224

1945

}

1225

1946

}

1226

1947

#endif /* __linux__ */

1227

exitcode = EXIT_FAILURE;

1948

exitcode = EX_OSERR;

1949

/* Lower privileges */

1950

errno = 0;

1951

ret = seteuid(uid);

1952

if(ret == -1){

1953

perror_plus("seteuid");

1954

}

1228

1955

goto end;

1229

1956

}

1230

1957

if((network.ifr_flags & IFF_UP) == 0){

1233

1960

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

1234

1961

if(ret == -1){

1235

1962

take_down_interface = false;

1236

perror("ioctl SIOCSIFFLAGS");

1237

exitcode = EXIT_FAILURE;

1963

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1964

exitcode = EX_OSERR;

1238

1965

#ifdef __linux__

1239

1966

if(restore_loglevel){

1240

1967

ret = klogctl(7, NULL, 0);

1241

1968

if(ret == -1){

1242

perror("klogctl");

1969

perror_plus("klogctl");

1243

1970

}

1244

1971

}

1245

1972

#endif /* __linux__ */

1973

/* Lower privileges */

1974

errno = 0;

1975

ret = seteuid(uid);

1976

if(ret == -1){

1977

perror_plus("seteuid");

1978

}

1246

1979

goto end;

1247

1980

}

1248

1981

}

1249

/* sleep checking until interface is running */

1982

/* Sleep checking until interface is running.

1983

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

1250

1984

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

1251

1985

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

1252

1986

if(ret == -1){

1253

perror("ioctl SIOCGIFFLAGS");

1987

perror_plus("ioctl SIOCGIFFLAGS");

1254

1988

} else if(network.ifr_flags & IFF_RUNNING){

1255

1989

break;

1256

1990

}

1257

1991

struct timespec sleeptime = { .tv_nsec = 250000000 };

1258

1992

ret = nanosleep(&sleeptime, NULL);

1259

1993

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

1260

perror("nanosleep");

1994

perror_plus("nanosleep");

1261

1995

}

1262

1996

}

1263

1997

if(not take_down_interface){

1264

1998

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

1265

1999

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

1266

2000

if(ret == -1){

1267

perror("close");

2001

perror_plus("close");

1268

2002

}

1269

2003

}

1270

2004

#ifdef __linux__

1272

2006

/* Restores kernel loglevel to default */

1273

2007

ret = klogctl(7, NULL, 0);

1274

2008

if(ret == -1){

1275

perror("klogctl");

2009

perror_plus("klogctl");

1276

2010

}

1277

2011

}

1278

2012

#endif /* __linux__ */

1279

}

1280

1281

if(quit_now){

1282

goto end;

1283

}

1284

1285

uid = getuid();

1286

gid = getgid();

1287

1288

errno = 0;

1289

setgid(gid);

1290

if(ret == -1){

1291

perror("setgid");

1292

}

1293

1294

ret = setuid(uid);

1295

if(ret == -1){

1296

perror("setuid");

2013

/* Lower privileges */

2014

errno = 0;

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

2019

}

1297

2020

}

1298

2021

1299

2022

if(quit_now){

1302

2025

1303

2026

ret = init_gnutls_global(pubkey, seckey);

1304

2027

if(ret == -1){

1305

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

1306

exitcode = EXIT_FAILURE;

2028

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

2029

exitcode = EX_UNAVAILABLE;

1307

2030

goto end;

1308

2031

} else {

1309

2032

gnutls_initialized = true;

1313

2036

goto end;

1314

2037

}

1315

2038

2039

if(mkdtemp(tempdir) == NULL){

2040

perror_plus("mkdtemp");

2041

goto end;

2042

}

1316

2043

tempdir_created = true;

1317

if(mkdtemp(tempdir) == NULL){

1318

tempdir_created = false;

1319

perror("mkdtemp");

1320

goto end;

1321

}

1322

2044

1323

2045

if(quit_now){

1324

2046

goto end;

1325

2047

}

1326

2048

1327

2049

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

1328

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

1329

exitcode = EXIT_FAILURE;

2050

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

2051

exitcode = EX_UNAVAILABLE;

1330

2052

goto end;

1331

2053

} else {

1332

2054

gpgme_initialized = true;

1341

2063

/* (Mainly meant for debugging) */

1342

2064

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

1343

2065

if(address == NULL){

1344

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

1345

exitcode = EXIT_FAILURE;

2066

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

2067

exitcode = EX_USAGE;

1346

2068

goto end;

1347

2069

}

1348

2070

1355

2077

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

1356

2078

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

1357

2079

or tmpmax != (uint16_t)tmpmax){

1358

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

1359

exitcode = EXIT_FAILURE;

2080

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

2081

exitcode = EX_USAGE;

1360

2082

goto end;

1361

2083

}

1362

2084

1366

2088

1367

2089

port = (uint16_t)tmpmax;

1368

2090

*address = '\0';

1369

address = connect_to;

1370

2091

/* Colon in address indicates IPv6 */

1371

2092

int af;

1372

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

2093

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

1373

2094

af = AF_INET6;

2095

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

2096

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

2097

{

2098

connect_to++;

2099

address[-1] = '\0';

2100

}

1374

2101

} else {

1375

2102

af = AF_INET;

1376

2103

}

2104

address = connect_to;

1377

2105

1378

2106

if(quit_now){

1379

2107

goto end;

1380

2108

}

1381

2109

1382

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

1383

if(ret < 0){

1384

exitcode = EXIT_FAILURE;

1385

} else {

2110

while(not quit_now){

2111

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

2112

if(quit_now or ret == 0){

2113

break;

2114

}

2115

if(debug){

2116

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

2117

(int)retry_interval);

2118

}

2119

sleep((int)retry_interval);

2120

}

2121

2122

if (not quit_now){

1386

2123

exitcode = EXIT_SUCCESS;

1387

2124

}

2125

1388

2126

goto end;

1389

2127

}

1390

2128

1412

2150

1413

2151

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

1414

2152

if(mc.server == NULL){

1415

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

1416

avahi_strerror(error));

1417

exitcode = EXIT_FAILURE;

2153

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

2154

avahi_strerror(error));

2155

exitcode = EX_UNAVAILABLE;

1418

2156

goto end;

1419

2157

}

1420

2158

1427

2165

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1428

2166

NULL, 0, browse_callback, NULL);

1429

2167

if(sb == NULL){

1430

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

1431

avahi_strerror(avahi_server_errno(mc.server)));

1432

exitcode = EXIT_FAILURE;

2168

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

2169

avahi_strerror(avahi_server_errno(mc.server)));

2170

exitcode = EX_UNAVAILABLE;

1433

2171

goto end;

1434

2172

}

1435

2173

1440

2178

/* Run the main loop */

1441

2179

1442

2180

if(debug){

1443

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

1444

}

1445

1446

avahi_simple_poll_loop(mc.simple_poll);

2181

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

2182

}

2183

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2186

if(debug){

2187

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

2188

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

2189

}

1447

2190

1448

2191

end:

1449

2192

1450

2193

if(debug){

1451

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

2194

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

1452

2195

}

1453

2196

1454

2197

/* Cleanup things */

1471

2214

gpgme_release(mc.ctx);

1472

2215

}

1473

2216

1474

/* Take down the network interface */

1475

if(take_down_interface){

1476

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

1477

if(ret == -1){

1478

perror("ioctl SIOCGIFFLAGS");

1479

} else if(network.ifr_flags & IFF_UP) {

1480

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

1481

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

1482

if(ret == -1){

1483

perror("ioctl SIOCSIFFLAGS");

1484

}

1485

}

1486

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

1487

if(ret == -1){

1488

perror("close");

1489

}

1490

}

1491

1492

/* Removes the temp directory used by GPGME */

2217

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

2218

has seen */

2219

if(mc.current_server != NULL){

2220

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

2221

while(mc.current_server != NULL){

2222

server *next = mc.current_server->next;

2223

free(mc.current_server);

2224

mc.current_server = next;

2225

}

2226

}

2227

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

2232

{

2233

errno = 0;

2234

ret = seteuid(0);

2235

if(ret == -1){

2236

perror_plus("seteuid");

2237

}

2238

2239

/* Take down the network interface */

2240

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

2241

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

2242

if(ret == -1){

2243

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

2245

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

2246

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

2247

if(ret == -1){

2248

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2249

}

2250

}

2251

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

2252

if(ret == -1){

2253

perror_plus("close");

2254

}

2255

}

2256

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2263

2264

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

1493

2265

if(tempdir_created){

1494

DIR *d;

1495

struct dirent *direntry;

1496

d = opendir(tempdir);

1497

if(d == NULL){

1498

if(errno != ENOENT){

1499

perror("opendir");

1500

}

1501

} else {

1502

while(true){

1503

direntry = readdir(d);

1504

if(direntry == NULL){

1505

break;

1506

}

1507

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

1508

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

1509

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

1510

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

1511

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

1512

continue;

1513

}

2266

struct dirent **direntries = NULL;

2267

struct dirent *direntry = NULL;

2268

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

2269

alphasort);

2270

if (numentries > 0){

2271

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

2272

direntry = direntries[i];

1514

2273

char *fullname = NULL;

1515

2274

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

1516

2275

direntry->d_name);

1517

2276

if(ret < 0){

1518

perror("asprintf");

2277

perror_plus("asprintf");

1519

2278

continue;

1520

2279

}

1521

2280

ret = remove(fullname);

1522

2281

if(ret == -1){

1523

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

1524

strerror(errno));

2282

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

2283

strerror(errno));

1525

2284

}

1526

2285

free(fullname);

1527

2286

}

1528

closedir(d);

2287

}

2288

2289

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

2290

free(direntries);

2291

if (numentries == -1){

2292

perror_plus("scandir");

1529

2293

}

1530

2294

ret = rmdir(tempdir);

1531

2295

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

1532

perror("rmdir");

2296

perror_plus("rmdir");

1533

2297

}

1534

2298

}

1535

2299

1536

2300

if(quit_now){

1537

2301

sigemptyset(&old_sigterm_action.sa_mask);

1538

2302

old_sigterm_action.sa_handler = SIG_DFL;

1539

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

2303

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2304

&old_sigterm_action,

2305

NULL));

1540

2306

if(ret == -1){

1541

perror("sigaction");

1542

}

1543

raise(signal_received);

2307

perror_plus("sigaction");

2308

}

2309

do {

2310

ret = raise(signal_received);

2311

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

2312

if(ret != 0){

2313

perror_plus("raise");

2314

abort();

2315

}

2316

TEMP_FAILURE_RETRY(pause());

1544

2317

}

1545

2318

1546

2319

return exitcode;