/mandos/release : revision 237.15.6

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* "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

32

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

33

#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif /* not _LARGEFILE_SOURCE */

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

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

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stdout, ferror() */

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

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stdout, ferror(), remove() */

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

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

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

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strtof(), abort() */

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opendir(), DIR */

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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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getnameinfo() */

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

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inet_pton(), connect() */

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

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#include <dirent.h> /* opendir(), struct dirent, readdir()

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61

*/

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62

#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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*/

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

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

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setgid(), pause(), _exit(),

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unlinkat() */

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

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setgid(), pause() */

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

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

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

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argp_state, struct argp,

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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#include <argz.h> /* argz_add_sep(), argz_next(),

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

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EAI_SYSTEM, gai_strerror() */

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91

#ifdef __linux__

100

92

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

142

134

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

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135

char *connect_to = NULL;

144

136

const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

146

uid_t uid = 65534;

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gid_t gid = 65534;

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137

149

138

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

150

139

typedef struct server{

151

140

const char *ip;

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in_port_t port;

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uint16_t port;

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142

AvahiIfIndex if_index;

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143

int af;

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144

struct timespec last_seen;

159

148

160

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

161

150

typedef struct {

151

AvahiSimplePoll *simple_poll;

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152

AvahiServer *server;

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153

gnutls_certificate_credentials_t cred;

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154

unsigned int dh_bits;

166

156

const char *priority;

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157

gpgme_ctx_t ctx;

168

158

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

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159

} mandos_context;

172

160

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/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

161

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

162

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

163

.dh_bits = 1024, .priority = "SECURE256"

164

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

165

.current_server = NULL };

175

166

176

167

sig_atomic_t quit_now = 0;

177

168

int signal_received = 0;

178

169

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170

/* Function to use when printing errors */

180

171

void perror_plus(const char *print_text){

181

int e = errno;

182

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

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173

program_invocation_short_name);

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errno = e;

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174

perror(print_text);

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}

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

189

177

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

190

178

va_list ap;

191

179

va_start (ap, format);

192

180

193

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

194

program_invocation_short_name));

195

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

181

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));

182

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

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183

}

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/*

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

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* "buffer_length" is how much is already used.

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189

*/

203

__attribute__((nonnull, warn_unused_result))

204

190

size_t incbuffer(char **buffer, size_t buffer_length,

205

191

size_t buffer_capacity){

206

192

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

193

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

194

if(buffer == NULL){

213

195

return 0;

214

196

}

215

*buffer = new_buf;

216

197

buffer_capacity += BUFFER_SIZE;

217

198

}

218

199

return buffer_capacity;

219

200

}

220

201

221

202

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

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

203

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

204

int af){

225

205

int ret;

226

206

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

227

207

if(new_server == NULL){

228

208

perror_plus("malloc");

229

return false;

209

return -1;

230

210

}

231

211

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

232

212

.port = port,

234

214

.af = af };

235

215

if(new_server->ip == NULL){

236

216

perror_plus("strdup");

237

return false;

238

}

239

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

217

return -1;

243

218

}

244

219

/* Special case of first server */

245

if(*current_server == NULL){

220

if (mc.current_server == NULL){

246

221

new_server->next = new_server;

247

222

new_server->prev = new_server;

248

*current_server = new_server;

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mc.current_server = new_server;

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

249

225

} else {

250

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

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new_server->next = *current_server;

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new_server->prev = (*current_server)->prev;

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new_server->next = mc.current_server;

227

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

253

228

new_server->prev->next = new_server;

254

(*current_server)->prev = new_server;

255

}

256

return true;

229

mc.current_server->prev = new_server;

230

}

231

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

232

if(ret == -1){

233

perror_plus("clock_gettime");

234

return -1;

235

}

236

return 0;

257

237

}

258

238

259

239

/*

260

240

* Initialize GPGME.

261

241

*/

262

__attribute__((nonnull, warn_unused_result))

263

static bool init_gpgme(const char * const seckey,

264

const char * const pubkey,

265

const char * const tempdir,

266

mandos_context *mc){

242

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

243

const char *tempdir){

267

244

gpgme_error_t rc;

268

245

gpgme_engine_info_t engine_info;

269

246

247

270

248

/*

271

249

* Helper function to insert pub and seckey to the engine keyring.

272

250

*/

273

bool import_key(const char * const filename){

251

bool import_key(const char *filename){

274

252

int ret;

275

253

int fd;

276

254

gpgme_data_t pgp_data;

284

262

rc = gpgme_data_new_from_fd(&pgp_data, fd);

285

263

if(rc != GPG_ERR_NO_ERROR){

286

264

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

287

gpgme_strsource(rc), gpgme_strerror(rc));

265

gpgme_strsource(rc), gpgme_strerror(rc));

288

266

return false;

289

267

}

290

268

291

rc = gpgme_op_import(mc->ctx, pgp_data);

269

rc = gpgme_op_import(mc.ctx, pgp_data);

292

270

if(rc != GPG_ERR_NO_ERROR){

293

271

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

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gpgme_strsource(rc), gpgme_strerror(rc));

272

gpgme_strsource(rc), gpgme_strerror(rc));

295

273

return false;

296

274

}

297

275

312

290

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

313

291

if(rc != GPG_ERR_NO_ERROR){

314

292

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

315

gpgme_strsource(rc), gpgme_strerror(rc));

293

gpgme_strsource(rc), gpgme_strerror(rc));

316

294

return false;

317

295

}

318

296

320

298

rc = gpgme_get_engine_info(&engine_info);

321

299

if(rc != GPG_ERR_NO_ERROR){

322

300

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

323

gpgme_strsource(rc), gpgme_strerror(rc));

301

gpgme_strsource(rc), gpgme_strerror(rc));

324

302

return false;

325

303

}

326

304

while(engine_info != NULL){

332

310

engine_info = engine_info->next;

333

311

}

334

312

if(engine_info == NULL){

335

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

336

tempdir);

313

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

337

314

return false;

338

315

}

339

316

340

317

/* Create new GPGME "context" */

341

rc = gpgme_new(&(mc->ctx));

318

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

342

319

if(rc != GPG_ERR_NO_ERROR){

343

320

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

344

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

345

gpgme_strerror(rc));

321

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

322

gpgme_strerror(rc));

346

323

return false;

347

324

}

348

325

357

334

* Decrypt OpenPGP data.

358

335

* Returns -1 on error

359

336

*/

360

__attribute__((nonnull, warn_unused_result))

361

337

static ssize_t pgp_packet_decrypt(const char *cryptotext,

362

338

size_t crypto_size,

363

char **plaintext,

364

mandos_context *mc){

339

char **plaintext){

365

340

gpgme_data_t dh_crypto, dh_plain;

366

341

gpgme_error_t rc;

367

342

ssize_t ret;

377

352

0);

378

353

if(rc != GPG_ERR_NO_ERROR){

379

354

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

355

gpgme_strsource(rc), gpgme_strerror(rc));

381

356

return -1;

382

357

}

383

358

385

360

rc = gpgme_data_new(&dh_plain);

386

361

if(rc != GPG_ERR_NO_ERROR){

387

362

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

388

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

389

gpgme_strsource(rc), gpgme_strerror(rc));

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

390

365

gpgme_data_release(dh_crypto);

391

366

return -1;

392

367

}

393

368

394

369

/* Decrypt data from the cryptotext data buffer to the plaintext

395

370

data buffer */

396

rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

371

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

397

372

if(rc != GPG_ERR_NO_ERROR){

398

373

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

374

gpgme_strsource(rc), gpgme_strerror(rc));

400

375

plaintext_length = -1;

401

376

if(debug){

402

377

gpgme_decrypt_result_t result;

403

result = gpgme_op_decrypt_result(mc->ctx);

378

result = gpgme_op_decrypt_result(mc.ctx);

404

379

if(result == NULL){

405

380

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

406

381

} else {

407

382

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

408

result->unsupported_algorithm);

383

result->unsupported_algorithm);

409

384

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

410

result->wrong_key_usage);

385

result->wrong_key_usage);

411

386

if(result->file_name != NULL){

412

387

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

413

388

}

415

390

recipient = result->recipients;

416

391

while(recipient != NULL){

417

392

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

418

gpgme_pubkey_algo_name

419

(recipient->pubkey_algo));

393

gpgme_pubkey_algo_name(recipient->pubkey_algo));

420

394

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

421

395

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

422

recipient->status == GPG_ERR_NO_SECKEY

423

? "No" : "Yes");

396

recipient->status == GPG_ERR_NO_SECKEY

397

? "No" : "Yes");

424

398

recipient = recipient->next;

425

399

}

426

400

}

483

457

return plaintext_length;

484

458

}

485

459

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

const char *ret = gnutls_strerror(value);

460

static const char * safer_gnutls_strerror(int value){

461

const char *ret = gnutls_strerror(value); /* Spurious warning from

462

-Wunreachable-code */

489

463

if(ret == NULL)

490

464

ret = "(unknown)";

491

465

return ret;

492

466

}

493

467

494

468

/* GnuTLS log function callback */

495

__attribute__((nonnull))

496

469

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

497

470

const char* string){

498

471

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

499

472

}

500

473

501

__attribute__((nonnull, warn_unused_result))

502

474

static int init_gnutls_global(const char *pubkeyfilename,

503

const char *seckeyfilename,

504

mandos_context *mc){

475

const char *seckeyfilename){

505

476

int ret;

506

477

507

478

if(debug){

510

481

511

482

ret = gnutls_global_init();

512

483

if(ret != GNUTLS_E_SUCCESS){

513

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

514

safer_gnutls_strerror(ret));

484

fprintf_plus(stderr, "GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));

515

485

return -1;

516

486

}

517

487

524

494

}

525

495

526

496

/* OpenPGP credentials */

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

497

ret = gnutls_certificate_allocate_credentials(&mc.cred);

528

498

if(ret != GNUTLS_E_SUCCESS){

529

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

530

safer_gnutls_strerror(ret));

499

fprintf_plus(stderr, "GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));

531

500

gnutls_global_deinit();

532

501

return -1;

533

502

}

534

503

535

504

if(debug){

536

505

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

537

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

538

pubkeyfilename,

539

seckeyfilename);

506

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

507

seckeyfilename);

540

508

}

541

509

542

510

ret = gnutls_certificate_set_openpgp_key_file

543

(mc->cred, pubkeyfilename, seckeyfilename,

511

(mc.cred, pubkeyfilename, seckeyfilename,

544

512

GNUTLS_OPENPGP_FMT_BASE64);

545

513

if(ret != GNUTLS_E_SUCCESS){

546

514

fprintf_plus(stderr,

547

515

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

548

516

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

549

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

550

safer_gnutls_strerror(ret));

517

fprintf_plus(stderr, "The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));

551

518

goto globalfail;

552

519

}

553

520

554

521

/* GnuTLS server initialization */

555

ret = gnutls_dh_params_init(&mc->dh_params);

522

ret = gnutls_dh_params_init(&mc.dh_params);

556

523

if(ret != GNUTLS_E_SUCCESS){

557

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

558

" initialization: %s\n",

559

safer_gnutls_strerror(ret));

524

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

525

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

560

526

goto globalfail;

561

527

}

562

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

528

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

563

529

if(ret != GNUTLS_E_SUCCESS){

564

530

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

565

safer_gnutls_strerror(ret));

531

safer_gnutls_strerror(ret));

566

532

goto globalfail;

567

533

}

568

534

569

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

535

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

570

536

571

537

return 0;

572

538

573

539

globalfail:

574

540

575

gnutls_certificate_free_credentials(mc->cred);

541

gnutls_certificate_free_credentials(mc.cred);

576

542

gnutls_global_deinit();

577

gnutls_dh_params_deinit(mc->dh_params);

543

gnutls_dh_params_deinit(mc.dh_params);

578

544

return -1;

579

545

}

580

546

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

547

static int init_gnutls_session(gnutls_session_t *session){

584

548

int ret;

585

549

/* GnuTLS session creation */

586

550

do {

590

554

}

591

555

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

592

556

if(ret != GNUTLS_E_SUCCESS){

593

fprintf_plus(stderr,

594

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

595

safer_gnutls_strerror(ret));

557

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

558

safer_gnutls_strerror(ret));

596

559

}

597

560

598

561

{

599

562

const char *err;

600

563

do {

601

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

564

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

602

565

if(quit_now){

603

566

gnutls_deinit(*session);

604

567

return -1;

606

569

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

607

570

if(ret != GNUTLS_E_SUCCESS){

608

571

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

609

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

610

safer_gnutls_strerror(ret));

572

fprintf_plus(stderr, "GnuTLS error: %s\n", safer_gnutls_strerror(ret));

611

573

gnutls_deinit(*session);

612

574

return -1;

613

575

}

615

577

616

578

do {

617

579

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

618

mc->cred);

580

mc.cred);

619

581

if(quit_now){

620

582

gnutls_deinit(*session);

621

583

return -1;

623

585

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

624

586

if(ret != GNUTLS_E_SUCCESS){

625

587

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

626

safer_gnutls_strerror(ret));

588

safer_gnutls_strerror(ret));

627

589

gnutls_deinit(*session);

628

590

return -1;

629

591

}

631

593

/* ignore client certificate if any. */

632

594

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

633

595

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

596

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

635

597

636

598

return 0;

637

599

}

641

603

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

642

604

643

605

/* Called when a Mandos server is found */

644

__attribute__((nonnull, warn_unused_result))

645

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

606

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

646

607

AvahiIfIndex if_index,

647

int af, mandos_context *mc){

608

int af){

648

609

int ret, tcp_sd = -1;

649

610

ssize_t sret;

650

struct sockaddr_storage to;

611

union {

612

struct sockaddr_in in;

613

struct sockaddr_in6 in6;

614

} to;

651

615

char *buffer = NULL;

652

616

char *decrypted_buffer = NULL;

653

617

size_t buffer_length = 0;

677

641

return -1;

678

642

}

679

643

680

/* If the interface is specified and we have a list of interfaces */

681

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

682

/* Check if the interface is one of the interfaces we are using */

683

bool match = false;

684

{

685

char *interface = NULL;

686

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

687

interface))){

688

if(if_nametoindex(interface) == (unsigned int)if_index){

689

match = true;

690

break;

691

}

692

}

693

}

694

if(not match){

695

/* This interface does not match any in the list, so we don't

696

connect to the server */

697

if(debug){

698

char interface[IF_NAMESIZE];

699

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

700

perror_plus("if_indextoname");

701

} else {

702

fprintf_plus(stderr, "Skipping server on non-used interface"

703

" \"%s\"\n",

704

if_indextoname((unsigned int)if_index,

705

interface));

706

}

707

}

708

return -1;

709

}

710

}

711

712

ret = init_gnutls_session(&session, mc);

644

ret = init_gnutls_session(&session);

713

645

if(ret != 0){

714

646

return -1;

715

647

}

716

648

717

649

if(debug){

718

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

719

PRIuMAX "\n", ip, (uintmax_t)port);

650

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

651

"\n", ip, port);

720

652

}

721

653

722

654

tcp_sd = socket(pf, SOCK_STREAM, 0);

734

666

735

667

memset(&to, 0, sizeof(to));

736

668

if(af == AF_INET6){

737

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

738

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

669

to.in6.sin6_family = (sa_family_t)af;

670

ret = inet_pton(af, ip, &to.in6.sin6_addr);

739

671

} else { /* IPv4 */

740

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

741

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

672

to.in.sin_family = (sa_family_t)af;

673

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

742

674

}

743

675

if(ret < 0 ){

744

676

int e = errno;

753

685

goto mandos_end;

754

686

}

755

687

if(af == AF_INET6){

756

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

757

if(IN6_IS_ADDR_LINKLOCAL

758

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

688

to.in6.sin6_port = htons(port); /* Spurious warnings from

689

-Wconversion and

690

-Wunreachable-code */

691

692

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

693

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

694

-Wunreachable-code*/

759

695

if(if_index == AVAHI_IF_UNSPEC){

760

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

761

" incomplete without a network interface\n");

696

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

697

" without a network interface\n");

762

698

errno = EINVAL;

763

699

goto mandos_end;

764

700

}

765

701

/* Set the network interface number as scope */

766

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

702

to.in6.sin6_scope_id = (uint32_t)if_index;

767

703

}

768

704

} else {

769

((struct sockaddr_in *)&to)->sin_port = htons(port);

705

to.in.sin_port = htons(port); /* Spurious warnings from

706

-Wconversion and

707

-Wunreachable-code */

770

708

}

771

709

772

710

if(quit_now){

780

718

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

781

719

perror_plus("if_indextoname");

782

720

} else {

783

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

784

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

721

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

722

ip, interface, port);

785

723

}

786

724

} else {

787

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

788

ip, (uintmax_t)port);

725

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

789

726

}

790

727

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

791

728

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

729

const char *pcret;

792

730

if(af == AF_INET6){

793

ret = getnameinfo((struct sockaddr *)&to,

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

731

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

732

sizeof(addrstr));

797

733

} else {

798

ret = getnameinfo((struct sockaddr *)&to,

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

734

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

735

sizeof(addrstr));

802

736

}

803

if(ret == EAI_SYSTEM){

804

perror_plus("getnameinfo");

805

} else if(ret != 0) {

806

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

807

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

808

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

737

if(pcret == NULL){

738

perror_plus("inet_ntop");

739

} else {

740

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

741

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

742

}

809

743

}

810

744

}

811

745

815

749

}

816

750

817

751

if(af == AF_INET6){

818

ret = connect(tcp_sd, (struct sockaddr *)&to,

819

sizeof(struct sockaddr_in6));

752

ret = connect(tcp_sd, &to.in6, sizeof(to));

820

753

} else {

821

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

822

sizeof(struct sockaddr_in));

754

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

823

755

}

824

756

if(ret < 0){

825

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

757

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

826

758

int e = errno;

827

759

perror_plus("connect");

828

760

errno = e;

874

806

goto mandos_end;

875

807

}

876

808

877

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

878

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

879

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

880

gnutls_transport_set_ptr(session,

881

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

809

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

810

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

882

811

883

812

if(quit_now){

884

813

errno = EINTR;

905

834

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

906

835

907

836

if(debug){

908

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

909

" %s\n", ip);

837

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from %s\n", ip);

910

838

}

911

839

912

840

while(true){

950

878

}

951

879

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

952

880

if(ret < 0){

953

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

954

"***\n");

881

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

955

882

gnutls_perror(ret);

956

883

errno = EPROTO;

957

884

goto mandos_end;

959

886

break;

960

887

default:

961

888

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

962

" encrypted session with Mandos server\n");

889

" encrypted session with Mandos server\n");

963

890

gnutls_bye(session, GNUTLS_SHUT_RDWR);

964

891

errno = EIO;

965

892

goto mandos_end;

989

916

if(buffer_length > 0){

990

917

ssize_t decrypted_buffer_size;

991

918

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

992

&decrypted_buffer, mc);

919

&decrypted_buffer);

993

920

if(decrypted_buffer_size >= 0){

994

921

995

922

written = 0;

1006

933

int e = errno;

1007

934

if(debug){

1008

935

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

1009

strerror(errno));

936

strerror(errno));

1010

937

}

1011

938

errno = e;

1012

939

goto mandos_end;

1043

970

return retval;

1044

971

}

1045

972

1046

__attribute__((nonnull))

1047

973

static void resolve_callback(AvahiSServiceResolver *r,

1048

974

AvahiIfIndex interface,

1049

975

AvahiProtocol proto,

1057

983

AVAHI_GCC_UNUSED AvahiStringList *txt,

1058

984

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1059

985

flags,

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

986

AVAHI_GCC_UNUSED void* userdata){

987

assert(r);

1064

988

1065

989

/* Called whenever a service has been resolved successfully or

1066

990

timed out */

1072

996

switch(event){

1073

997

default:

1074

998

case AVAHI_RESOLVER_FAILURE:

1075

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

1076

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

1077

domain,

1078

avahi_strerror(avahi_server_errno

1079

(((mandos_context*)mc)->server)));

999

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

1000

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

1001

avahi_strerror(avahi_server_errno(mc.server)));

1080

1002

break;

1081

1003

1082

1004

case AVAHI_RESOLVER_FOUND:

1085

1007

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

1086

1008

if(debug){

1087

1009

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

1088

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

1089

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

1010

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

1011

ip, (intmax_t)interface, port);

1090

1012

}

1091

int ret = start_mandos_communication(ip, (in_port_t)port,

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

1013

int ret = start_mandos_communication(ip, port, interface,

1014

avahi_proto_to_af(proto));

1095

1015

if(ret == 0){

1096

avahi_simple_poll_quit(simple_poll);

1016

avahi_simple_poll_quit(mc.simple_poll);

1097

1017

} else {

1098

if(not add_server(ip, (in_port_t)port, interface,

1099

avahi_proto_to_af(proto),

1100

&((mandos_context*)mc)->current_server)){

1101

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

1102

" list\n", name);

1103

}

1018

ret = add_server(ip, port, interface,

1019

avahi_proto_to_af(proto));

1104

1020

}

1105

1021

}

1106

1022

}

1116

1032

const char *domain,

1117

1033

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1118

1034

flags,

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

1035

AVAHI_GCC_UNUSED void* userdata){

1036

assert(b);

1123

1037

1124

1038

/* Called whenever a new services becomes available on the LAN or

1125

1039

is removed from the LAN */

1133

1047

case AVAHI_BROWSER_FAILURE:

1134

1048

1135

1049

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

1136

avahi_strerror(avahi_server_errno

1137

(((mandos_context*)mc)->server)));

1138

avahi_simple_poll_quit(simple_poll);

1050

avahi_strerror(avahi_server_errno(mc.server)));

1051

avahi_simple_poll_quit(mc.simple_poll);

1139

1052

return;

1140

1053

1141

1054

case AVAHI_BROWSER_NEW:

1144

1057

the callback function is called the Avahi server will free the

1145

1058

resolver for us. */

1146

1059

1147

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1148

interface, protocol, name, type,

1149

domain, protocol, 0,

1150

resolve_callback, mc) == NULL)

1151

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

1152

" %s\n", name,

1153

avahi_strerror(avahi_server_errno

1154

(((mandos_context*)mc)->server)));

1060

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

1061

name, type, domain, protocol, 0,

1062

resolve_callback, NULL) == NULL)

1063

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

1064

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

1155

1065

break;

1156

1066

1157

1067

case AVAHI_BROWSER_REMOVE:

1160

1070

case AVAHI_BROWSER_ALL_FOR_NOW:

1161

1071

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1162

1072

if(debug){

1163

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

1164

" searching...\n");

1073

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

1165

1074

}

1166

1075

break;

1167

1076

}

1176

1085

signal_received = sig;

1177

1086

int old_errno = errno;

1178

1087

/* set main loop to exit */

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1088

if(mc.simple_poll != NULL){

1089

avahi_simple_poll_quit(mc.simple_poll);

1181

1090

}

1182

1091

errno = old_errno;

1183

1092

}

1184

1093

1185

__attribute__((nonnull, warn_unused_result))

1186

1094

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

1187

1095

int ret;

1188

error_t ret_errno;

1189

1096

1190

1097

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

1191

1098

if(s < 0){

1192

ret_errno = errno;

1193

1099

perror_plus("socket");

1194

errno = ret_errno;

1195

1100

return false;

1196

1101

}

1197

1102

strcpy(ifr->ifr_name, ifname);

1198

1103

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1199

1104

if(ret == -1){

1200

1105

if(debug){

1201

ret_errno = errno;

1202

1106

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1204

1107

}

1205

1108

return false;

1206

1109

}

1207

1110

return true;

1208

1111

}

1209

1112

1210

__attribute__((nonnull, warn_unused_result))

1211

1113

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

1212

1114

1213

1115

/* Reject the loopback device */

1214

1116

if(ifr->ifr_flags & IFF_LOOPBACK){

1215

1117

if(debug){

1216

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

1217

ifname);

1118

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

1218

1119

}

1219

1120

return false;

1220

1121

}

1221

1122

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

1222

1123

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

1223

1124

if(debug){

1224

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

1225

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

1125

fprintf_plus(stderr, "Accepting point-to-point interface \"%s\"\n", ifname);

1226

1126

}

1227

1127

return true;

1228

1128

}

1229

1129

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

1230

1130

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

1231

1131

if(debug){

1232

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1233

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

1132

fprintf_plus(stderr, "Rejecting non-broadcast interface \"%s\"\n", ifname);

1234

1133

}

1235

1134

return false;

1236

1135

}

1237

1136

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

1238

1137

if(ifr->ifr_flags & IFF_NOARP){

1239

1138

if(debug){

1240

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

1241

ifname);

1139

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

1242

1140

}

1243

1141

return false;

1244

1142

}

1255

1153

* corresponds to an acceptable network device.

1256

1154

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

1257

1155

*/

1258

__attribute__((nonnull, warn_unused_result))

1259

1156

int good_interface(const struct dirent *if_entry){

1260

1157

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

1261

1158

return 0;

1264

1161

struct ifreq ifr;

1265

1162

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

1266

1163

if(debug){

1267

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

1268

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

1269

}

1270

return 0;

1271

}

1272

1273

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

1274

return 0;

1275

}

1276

return 1;

1277

}

1278

1279

/*

1280

* This function determines if a network interface is up.

1281

*/

1282

__attribute__((nonnull, warn_unused_result))

1283

bool interface_is_up(const char *interface){

1284

struct ifreq ifr;

1285

if(not get_flags(interface, &ifr)){

1286

if(debug){

1287

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

1288

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

1289

}

1290

return false;

1291

}

1292

1293

return (bool)(ifr.ifr_flags & IFF_UP);

1294

}

1295

1296

/*

1297

* This function determines if a network interface is running

1298

*/

1299

__attribute__((nonnull, warn_unused_result))

1300

bool interface_is_running(const char *interface){

1301

struct ifreq ifr;

1302

if(not get_flags(interface, &ifr)){

1303

if(debug){

1304

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

1305

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

1306

}

1307

return false;

1308

}

1309

1310

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1311

}

1312

1313

__attribute__((nonnull, pure, warn_unused_result))

1164

fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",

1165

if_entry->d_name);

1166

}

1167

return 0;

1168

}

1169

1170

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

1171

return 0;

1172

}

1173

return 1;

1174

}

1175

1176

/*

1177

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

1178

* corresponds to an acceptable network device which is up.

1179

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

1180

*/

1181

int up_interface(const struct dirent *if_entry){

1182

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

1183

return 0;

1184

}

1185

1186

struct ifreq ifr;

1187

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

1188

if(debug){

1189

fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",

1190

if_entry->d_name);

1191

}

1192

return 0;

1193

}

1194

1195

/* Reject down interfaces */

1196

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

1197

if(debug){

1198

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

1199

if_entry->d_name);

1200

}

1201

return 0;

1202

}

1203

1204

/* Reject non-running interfaces */

1205

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

1206

if(debug){

1207

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

1208

if_entry->d_name);

1209

}

1210

return 0;

1211

}

1212

1213

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

1214

return 0;

1215

}

1216

return 1;

1217

}

1218

1314

1219

int notdotentries(const struct dirent *direntry){

1315

1220

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

1316

1221

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

1323

1228

}

1324

1229

1325

1230

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

1326

__attribute__((nonnull, warn_unused_result))

1327

1231

int runnable_hook(const struct dirent *direntry){

1328

1232

int ret;

1329

1233

size_t sret;

1337

1241

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

1338

1242

"abcdefghijklmnopqrstuvwxyz"

1339

1243

"0123456789"

1340

"_.-");

1244

"_-");

1341

1245

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

1342

1246

/* Contains non-allowed characters */

1343

1247

if(debug){

1344

1248

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

1345

direntry->d_name);

1249

direntry->d_name);

1346

1250

}

1347

1251

return 0;

1348

1252

}

1349

1253

1350

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1254

char *fullname = NULL;

1255

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

1256

if(ret < 0){

1257

perror_plus("asprintf");

1258

return 0;

1259

}

1260

1261

ret = stat(fullname, &st);

1351

1262

if(ret == -1){

1352

1263

if(debug){

1353

1264

perror_plus("Could not stat hook");

1358

1269

/* Not a regular file */

1359

1270

if(debug){

1360

1271

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

1361

direntry->d_name);

1272

direntry->d_name);

1362

1273

}

1363

1274

return 0;

1364

1275

}

1366

1277

/* Not executable */

1367

1278

if(debug){

1368

1279

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

1369

direntry->d_name);

1280

direntry->d_name);

1370

1281

}

1371

1282

return 0;

1372

1283

}

1373

if(debug){

1374

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

1375

direntry->d_name);

1376

}

1377

1284

return 1;

1378

1285

}

1379

1286

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1287

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1383

1288

int ret;

1384

1289

struct timespec now;

1385

1290

struct timespec waited_time;

1386

1291

intmax_t block_time;

1387

1292

1388

1293

while(true){

1389

if(mc->current_server == NULL){

1390

if(debug){

1391

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

1392

" No timeout!\n");

1294

if(mc.current_server == NULL){

1295

if (debug){

1296

fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");

1393

1297

}

1394

1298

ret = avahi_simple_poll_iterate(s, -1);

1395

1299

} else {

1396

if(debug){

1397

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

1398

" it, or wait\n");

1300

if (debug){

1301

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

1302

" or wait\n");

1399

1303

}

1400

1304

/* the current time */

1401

1305

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1406

1310

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

1407

1311

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

1408

1312

waited_time.tv_sec = (now.tv_sec

1409

- mc->current_server->last_seen.tv_sec);

1313

- mc.current_server->last_seen.tv_sec);

1410

1314

waited_time.tv_nsec = (now.tv_nsec

1411

- mc->current_server->last_seen.tv_nsec);

1315

- mc.current_server->last_seen.tv_nsec);

1412

1316

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

1413

1317

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

1414

1318

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

1416

1320

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

1417

1321

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

1418

1322

1419

if(debug){

1420

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

1421

block_time);

1323

if (debug){

1324

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

1422

1325

}

1423

1326

1424

1327

if(block_time <= 0){

1425

ret = start_mandos_communication(mc->current_server->ip,

1426

mc->current_server->port,

1427

mc->current_server->if_index,

1428

mc->current_server->af, mc);

1328

ret = start_mandos_communication(mc.current_server->ip,

1329

mc.current_server->port,

1330

mc.current_server->if_index,

1331

mc.current_server->af);

1429

1332

if(ret == 0){

1430

avahi_simple_poll_quit(s);

1333

avahi_simple_poll_quit(mc.simple_poll);

1431

1334

return 0;

1432

1335

}

1433

1336

ret = clock_gettime(CLOCK_MONOTONIC,

1434

&mc->current_server->last_seen);

1337

&mc.current_server->last_seen);

1435

1338

if(ret == -1){

1436

1339

perror_plus("clock_gettime");

1437

1340

return -1;

1438

1341

}

1439

mc->current_server = mc->current_server->next;

1342

mc.current_server = mc.current_server->next;

1440

1343

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

1441

1344

servers, but don't block */

1442

1345

}

1444

1347

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

1445

1348

}

1446

1349

if(ret != 0){

1447

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

1350

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

1448

1351

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

1449

1352

}

1450

1353

}

1451

1354

}

1452

1355

}

1453

1356

1454

/* Set effective uid to 0, return errno */

1455

__attribute__((warn_unused_result))

1456

error_t raise_privileges(void){

1457

error_t old_errno = errno;

1458

error_t ret_errno = 0;

1459

if(seteuid(0) == -1){

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

/* Set effective and real user ID to 0. Return errno. */

1468

__attribute__((warn_unused_result))

1469

error_t raise_privileges_permanently(void){

1470

error_t old_errno = errno;

1471

error_t ret_errno = raise_privileges();

1472

if(ret_errno != 0){

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

if(setuid(0) == -1){

1477

ret_errno = errno;

1478

perror_plus("seteuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

/* Set effective user ID to unprivileged saved user ID */

1485

__attribute__((warn_unused_result))

1486

error_t lower_privileges(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

if(seteuid(uid) == -1){

1490

ret_errno = errno;

1491

perror_plus("seteuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

if(setuid(uid) == -1){

1503

ret_errno = errno;

1504

perror_plus("setuid");

1505

}

1506

errno = old_errno;

1507

return ret_errno;

1508

}

1509

1510

__attribute__((nonnull))

1511

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

1512

const float delay){

1513

struct dirent **direntries;

1514

if(hookdir_fd == -1){

1515

hookdir_fd = open(hookdir, O_RDONLY);

1516

if(hookdir_fd == -1){

1517

if(errno == ENOENT){

1518

if(debug){

1519

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1520

" found\n", hookdir);

1521

}

1522

} else {

1523

perror_plus("open");

1524

}

1525

return;

1526

}

1527

}

1528

#ifdef __GLIBC__

1529

#if __GLIBC_PREREQ(2, 15)

1530

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1531

runnable_hook, alphasort);

1532

#else /* not __GLIBC_PREREQ(2, 15) */

1533

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

1534

alphasort);

1535

#endif /* not __GLIBC_PREREQ(2, 15) */

1536

#else /* not __GLIBC__ */

1537

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

1538

alphasort);

1539

#endif /* not __GLIBC__ */

1540

if(numhooks == -1){

1541

perror_plus("scandir");

1542

return;

1543

}

1544

struct dirent *direntry;

1545

int ret;

1546

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

1547

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

1548

direntry = direntries[i];

1549

if(debug){

1550

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

1551

direntry->d_name);

1552

}

1553

pid_t hook_pid = fork();

1554

if(hook_pid == 0){

1555

/* Child */

1556

/* Raise privileges */

1557

if(raise_privileges_permanently() != 0){

1558

perror_plus("Failed to raise privileges");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Set group */

1562

errno = 0;

1563

ret = setgid(0);

1564

if(ret == -1){

1565

perror_plus("setgid");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Reset supplementary groups */

1569

errno = 0;

1570

ret = setgroups(0, NULL);

1571

if(ret == -1){

1572

perror_plus("setgroups");

1573

_exit(EX_NOPERM);

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

perror_plus("dup2(devnull, STDIN_FILENO)");

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1588

_exit(EX_OSERR);

1589

}

1590

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

1591

if(ret == -1){

1592

perror_plus("setenv");

1593

_exit(EX_OSERR);

1594

}

1595

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

1596

if(ret == -1){

1597

perror_plus("setenv");

1598

_exit(EX_OSERR);

1599

}

1600

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

1601

if(ret == -1){

1602

perror_plus("setenv");

1603

_exit(EX_OSERR);

1604

}

1605

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

1606

if(ret == -1){

1607

perror_plus("setenv");

1608

_exit(EX_OSERR);

1609

}

1610

char *delaystring;

1611

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

1612

if(ret == -1){

1613

perror_plus("asprintf");

1614

_exit(EX_OSERR);

1615

}

1616

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

1617

if(ret == -1){

1618

free(delaystring);

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

free(delaystring);

1623

if(connect_to != NULL){

1624

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

1625

if(ret == -1){

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

}

1630

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1631

if(hook_fd == -1){

1632

perror_plus("openat");

1633

_exit(EXIT_FAILURE);

1634

}

1635

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1636

perror_plus("close");

1637

_exit(EXIT_FAILURE);

1638

}

1639

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

1640

environ) == -1){

1641

perror_plus("fexecve");

1642

_exit(EXIT_FAILURE);

1643

}

1644

} else {

1645

int status;

1646

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

1647

perror_plus("waitpid");

1648

continue;

1649

}

1650

if(WIFEXITED(status)){

1651

if(WEXITSTATUS(status) != 0){

1652

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

1653

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

1654

WEXITSTATUS(status));

1655

continue;

1656

}

1657

} else if(WIFSIGNALED(status)){

1658

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

1659

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

1660

WTERMSIG(status));

1661

continue;

1662

} else {

1663

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

1664

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

1665

continue;

1666

}

1667

}

1668

if(debug){

1669

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

1670

direntry->d_name);

1671

}

1672

}

1673

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1674

perror_plus("close");

1675

} else {

1676

hookdir_fd = -1;

1677

}

1678

close(devnull);

1679

}

1680

1681

__attribute__((nonnull, warn_unused_result))

1682

error_t bring_up_interface(const char *const interface,

1683

const float delay){

1684

error_t old_errno = errno;

1685

int ret;

1686

struct ifreq network;

1687

unsigned int if_index = if_nametoindex(interface);

1688

if(if_index == 0){

1689

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

1690

errno = old_errno;

1691

return ENXIO;

1692

}

1693

1694

if(quit_now){

1695

errno = old_errno;

1696

return EINTR;

1697

}

1698

1699

if(not interface_is_up(interface)){

1700

error_t ret_errno = 0, ioctl_errno = 0;

1701

if(not get_flags(interface, &network)){

1702

ret_errno = errno;

1703

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

1704

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

1705

errno = old_errno;

1706

return ret_errno;

1707

}

1708

network.ifr_flags |= IFF_UP; /* set flag */

1709

1710

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

1711

if(sd == -1){

1712

ret_errno = errno;

1713

perror_plus("socket");

1714

errno = old_errno;

1715

return ret_errno;

1716

}

1717

1718

if(quit_now){

1719

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

1720

if(ret == -1){

1721

perror_plus("close");

1722

}

1723

errno = old_errno;

1724

return EINTR;

1725

}

1726

1727

if(debug){

1728

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

1729

interface);

1730

}

1731

1732

/* Raise privileges */

1733

ret_errno = raise_privileges();

1734

if(ret_errno != 0){

1735

perror_plus("Failed to raise privileges");

1736

}

1737

1738

#ifdef __linux__

1739

int ret_linux;

1740

bool restore_loglevel = false;

1741

if(ret_errno == 0){

1742

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1743

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

1744

ret_linux = klogctl(8, NULL, 5);

1745

if(ret_linux == -1){

1746

perror_plus("klogctl");

1747

} else {

1748

restore_loglevel = true;

1749

}

1750

}

1751

#endif /* __linux__ */

1752

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1753

ioctl_errno = errno;

1754

#ifdef __linux__

1755

if(restore_loglevel){

1756

ret_linux = klogctl(7, NULL, 0);

1757

if(ret_linux == -1){

1758

perror_plus("klogctl");

1759

}

1760

}

1761

#endif /* __linux__ */

1762

1763

/* If raise_privileges() succeeded above */

1764

if(ret_errno == 0){

1765

/* Lower privileges */

1766

ret_errno = lower_privileges();

1767

if(ret_errno != 0){

1768

errno = ret_errno;

1769

perror_plus("Failed to lower privileges");

1770

}

1771

}

1772

1773

/* Close the socket */

1774

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

1775

if(ret == -1){

1776

perror_plus("close");

1777

}

1778

1779

if(ret_setflags == -1){

1780

errno = ioctl_errno;

1781

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1782

errno = old_errno;

1783

return ioctl_errno;

1784

}

1785

} else if(debug){

1786

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

1787

interface);

1788

}

1789

1790

/* Sleep checking until interface is running.

1791

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

1792

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

1793

if(interface_is_running(interface)){

1794

break;

1795

}

1796

struct timespec sleeptime = { .tv_nsec = 250000000 };

1797

ret = nanosleep(&sleeptime, NULL);

1798

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

1799

perror_plus("nanosleep");

1800

}

1801

}

1802

1803

errno = old_errno;

1804

return 0;

1805

}

1806

1807

__attribute__((nonnull, warn_unused_result))

1808

error_t take_down_interface(const char *const interface){

1809

error_t old_errno = errno;

1810

struct ifreq network;

1811

unsigned int if_index = if_nametoindex(interface);

1812

if(if_index == 0){

1813

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

1814

errno = old_errno;

1815

return ENXIO;

1816

}

1817

if(interface_is_up(interface)){

1818

error_t ret_errno = 0, ioctl_errno = 0;

1819

if(not get_flags(interface, &network) and debug){

1820

ret_errno = errno;

1821

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

1822

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

1823

errno = old_errno;

1824

return ret_errno;

1825

}

1826

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

1827

1828

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

1829

if(sd == -1){

1830

ret_errno = errno;

1831

perror_plus("socket");

1832

errno = old_errno;

1833

return ret_errno;

1834

}

1835

1836

if(debug){

1837

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

1838

interface);

1839

}

1840

1841

/* Raise privileges */

1842

ret_errno = raise_privileges();

1843

if(ret_errno != 0){

1844

perror_plus("Failed to raise privileges");

1845

}

1846

1847

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1848

ioctl_errno = errno;

1849

1850

/* If raise_privileges() succeeded above */

1851

if(ret_errno == 0){

1852

/* Lower privileges */

1853

ret_errno = lower_privileges();

1854

if(ret_errno != 0){

1855

errno = ret_errno;

1856

perror_plus("Failed to lower privileges");

1857

}

1858

}

1859

1860

/* Close the socket */

1861

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

1862

if(ret == -1){

1863

perror_plus("close");

1864

}

1865

1866

if(ret_setflags == -1){

1867

errno = ioctl_errno;

1868

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1869

errno = old_errno;

1870

return ioctl_errno;

1871

}

1872

} else if(debug){

1873

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

1874

interface);

1875

}

1876

1877

errno = old_errno;

1878

return 0;

1879

}

1880

1881

1357

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

1882

mandos_context mc = { .server = NULL, .dh_bits = 1024,

1883

.priority = "SECURE256:!CTYPE-X.509:"

1884

"+CTYPE-OPENPGP", .current_server = NULL,

1885

.interfaces = NULL, .interfaces_size = 0 };

1886

1358

AvahiSServiceBrowser *sb = NULL;

1887

error_t ret_errno;

1359

int error;

1888

1360

int ret;

1889

1361

intmax_t tmpmax;

1890

1362

char *tmp;

1891

1363

int exitcode = EXIT_SUCCESS;

1892

char *interfaces_to_take_down = NULL;

1893

size_t interfaces_to_take_down_size = 0;

1894

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

1895

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

1896

char *tempdir = NULL;

1364

const char *interface = "";

1365

struct ifreq network;

1366

int sd = -1;

1367

bool take_down_interface = false;

1368

uid_t uid;

1369

gid_t gid;

1370

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

1371

bool tempdir_created = false;

1897

1372

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1898

1373

const char *seckey = PATHDIR "/" SECKEY;

1899

1374

const char *pubkey = PATHDIR "/" PUBKEY;

1900

char *interfaces_hooks = NULL;

1901

1375

1902

1376

bool gnutls_initialized = false;

1903

1377

bool gpgme_initialized = false;

1965

1439

.group = 2 },

1966

1440

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

1967

1441

.arg = "SECONDS",

1968

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

1442

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

1969

1443

.group = 2 },

1970

1444

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

1971

1445

.arg = "DIR",

1994

1468

connect_to = arg;

1995

1469

break;

1996

1470

case 'i': /* --interface */

1997

ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,

1998

arg, (int)',');

1999

if(ret_errno != 0){

2000

argp_error(state, "%s", strerror(ret_errno));

2001

}

1471

interface = arg;

2002

1472

break;

2003

1473

case 's': /* --seckey */

2004

1474

seckey = arg;

2047

1517

argp_state_help(state, state->out_stream,

2048

1518

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2049

1519

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

1520

fprintf_plus(state->out_stream, "Mandos plugin mandos-client: ");

2050

1521

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

2051

1522

exit(argp_err_exit_status);

2052

1523

break;

2080

1551

{

2081

1552

/* Work around Debian bug #633582:

2082

1553

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

2083

2084

/* Re-raise privileges */

2085

ret_errno = raise_privileges();

2086

if(ret_errno != 0){

2087

errno = ret_errno;

2088

perror_plus("Failed to raise privileges");

1554

struct stat st;

1555

1556

/* Re-raise priviliges */

1557

errno = 0;

1558

ret = seteuid(0);

1559

if(ret == -1){

1560

perror_plus("seteuid");

1561

}

1562

1563

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

1564

int seckey_fd = open(seckey, O_RDONLY);

1565

if(seckey_fd == -1){

1566

perror_plus("open");

1567

} else {

1568

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

1569

if(ret == -1){

1570

perror_plus("fstat");

1571

} else {

1572

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1573

ret = fchown(seckey_fd, uid, gid);

1574

if(ret == -1){

1575

perror_plus("fchown");

1576

}

1577

}

1578

}

1579

TEMP_FAILURE_RETRY(close(seckey_fd));

1580

}

1581

}

1582

1583

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

1584

int pubkey_fd = open(pubkey, O_RDONLY);

1585

if(pubkey_fd == -1){

1586

perror_plus("open");

1587

} else {

1588

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

1589

if(ret == -1){

1590

perror_plus("fstat");

1591

} else {

1592

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1593

ret = fchown(pubkey_fd, uid, gid);

1594

if(ret == -1){

1595

perror_plus("fchown");

1596

}

1597

}

1598

}

1599

TEMP_FAILURE_RETRY(close(pubkey_fd));

1600

}

1601

}

1602

1603

/* Lower privileges */

1604

errno = 0;

1605

ret = seteuid(uid);

1606

if(ret == -1){

1607

perror_plus("seteuid");

1608

}

1609

}

1610

1611

/* Find network hooks and run them */

1612

{

1613

struct dirent **direntries;

1614

struct dirent *direntry;

1615

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

1616

alphasort);

1617

if(numhooks == -1){

1618

perror_plus("scandir");

2089

1619

} else {

2090

struct stat st;

2091

2092

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

2093

int seckey_fd = open(seckey, O_RDONLY);

2094

if(seckey_fd == -1){

2095

perror_plus("open");

2096

} else {

2097

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

2098

if(ret == -1){

2099

perror_plus("fstat");

2100

} else {

2101

if(S_ISREG(st.st_mode)

2102

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

2103

ret = fchown(seckey_fd, uid, gid);

2104

if(ret == -1){

2105

perror_plus("fchown");

2106

}

2107

}

2108

}

2109

TEMP_FAILURE_RETRY(close(seckey_fd));

2110

}

2111

}

2112

2113

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

2114

int pubkey_fd = open(pubkey, O_RDONLY);

2115

if(pubkey_fd == -1){

2116

perror_plus("open");

2117

} else {

2118

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

2119

if(ret == -1){

2120

perror_plus("fstat");

2121

} else {

2122

if(S_ISREG(st.st_mode)

2123

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

2124

ret = fchown(pubkey_fd, uid, gid);

2125

if(ret == -1){

2126

perror_plus("fchown");

2127

}

2128

}

2129

}

2130

TEMP_FAILURE_RETRY(close(pubkey_fd));

2131

}

2132

}

2133

2134

/* Lower privileges */

2135

ret_errno = lower_privileges();

2136

if(ret_errno != 0){

2137

errno = ret_errno;

2138

perror_plus("Failed to lower privileges");

2139

}

2140

}

2141

}

2142

2143

/* Remove invalid interface names (except "none") */

2144

{

2145

char *interface = NULL;

2146

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2147

interface))){

2148

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

2149

and if_nametoindex(interface) == 0){

2150

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

2151

fprintf_plus(stderr, "Not using nonexisting interface"

2152

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

2153

}

2154

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2155

interface = NULL;

2156

}

2157

}

2158

}

2159

2160

/* Run network hooks */

2161

{

2162

if(mc.interfaces != NULL){

2163

interfaces_hooks = malloc(mc.interfaces_size);

2164

if(interfaces_hooks == NULL){

2165

perror_plus("malloc");

2166

goto end;

2167

}

2168

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2169

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2170

}

2171

run_network_hooks("start", interfaces_hooks != NULL ?

2172

interfaces_hooks : "", delay);

1620

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

1621

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

1622

direntry = direntries[0];

1623

char *fullname = NULL;

1624

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

1625

if(ret < 0){

1626

perror_plus("asprintf");

1627

continue;

1628

}

1629

pid_t hook_pid = fork();

1630

if(hook_pid == 0){

1631

/* Child */

1632

dup2(devnull, STDIN_FILENO);

1633

close(devnull);

1634

dup2(STDERR_FILENO, STDOUT_FILENO);

1635

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

1636

if(ret == -1){

1637

perror_plus("setenv");

1638

exit(1);

1639

}

1640

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

1641

if(ret == -1){

1642

perror_plus("setenv");

1643

exit(1);

1644

}

1645

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

1646

if(ret == -1){

1647

perror_plus("setenv");

1648

exit(1);

1649

}

1650

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

1651

if(ret == -1){

1652

perror_plus("setenv");

1653

exit(1);

1654

}

1655

char *delaystring;

1656

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

1657

if(ret == -1){

1658

perror_plus("asprintf");

1659

exit(1);

1660

}

1661

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

1662

if(ret == -1){

1663

free(delaystring);

1664

perror_plus("setenv");

1665

exit(1);

1666

}

1667

free(delaystring);

1668

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

1669

perror_plus("execl");

1670

} else {

1671

int status;

1672

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

1673

perror_plus("waitpid");

1674

free(fullname);

1675

continue;

1676

}

1677

if(WIFEXITED(status)){

1678

if(WEXITSTATUS(status) != 0){

1679

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

1680

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

1681

WEXITSTATUS(status));

1682

free(fullname);

1683

continue;

1684

}

1685

} else if(WIFSIGNALED(status)){

1686

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

1687

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

1688

WTERMSIG(status));

1689

free(fullname);

1690

continue;

1691

} else {

1692

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

1693

direntry->d_name);

1694

free(fullname);

1695

continue;

1696

}

1697

}

1698

free(fullname);

1699

if(quit_now){

1700

goto end;

1701

}

1702

}

1703

close(devnull);

1704

}

2173

1705

}

2174

1706

2175

1707

if(not debug){

2176

1708

avahi_set_log_function(empty_log);

2177

1709

}

2178

1710

1711

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

1712

struct dirent **direntries;

1713

/* First look for interfaces that are up */

1714

ret = scandir(sys_class_net, &direntries, up_interface,

1715

alphasort);

1716

if(ret == 0){

1717

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

1718

free(direntries);

1719

ret = scandir(sys_class_net, &direntries, good_interface,

1720

alphasort);

1721

}

1722

if(ret >= 1){

1723

/* Pick the first interface returned */

1724

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

1725

if(debug){

1726

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

1727

}

1728

if(interface == NULL){

1729

perror_plus("malloc");

1730

free(direntries);

1731

exitcode = EXIT_FAILURE;

1732

goto end;

1733

}

1734

free(direntries);

1735

} else {

1736

free(direntries);

1737

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

1738

exitcode = EXIT_FAILURE;

1739

goto end;

1740

}

1741

}

1742

2179

1743

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

2180

1744

from the signal handler */

2181

1745

/* Initialize the pseudo-RNG for Avahi */

2182

1746

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

2183

simple_poll = avahi_simple_poll_new();

2184

if(simple_poll == NULL){

2185

fprintf_plus(stderr,

2186

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

1747

mc.simple_poll = avahi_simple_poll_new();

1748

if(mc.simple_poll == NULL){

1749

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

2187

1750

exitcode = EX_UNAVAILABLE;

2188

1751

goto end;

2189

1752

}

2251

1814

}

2252

1815

}

2253

1816

2254

/* If no interfaces were specified, make a list */

2255

if(mc.interfaces == NULL){

2256

struct dirent **direntries = NULL;

2257

/* Look for any good interfaces */

2258

ret = scandir(sys_class_net, &direntries, good_interface,

2259

alphasort);

2260

if(ret >= 1){

2261

/* Add all found interfaces to interfaces list */

2262

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

2263

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2264

direntries[i]->d_name);

2265

if(ret_errno != 0){

2266

errno = ret_errno;

2267

perror_plus("argz_add");

2268

continue;

2269

}

2270

if(debug){

2271

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2272

direntries[i]->d_name);

2273

}

2274

}

2275

free(direntries);

1817

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

1818

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

1819

if_index = (AvahiIfIndex) if_nametoindex(interface);

1820

if(if_index == 0){

1821

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

1822

exitcode = EX_UNAVAILABLE;

1823

goto end;

1824

}

1825

1826

if(quit_now){

1827

goto end;

1828

}

1829

1830

/* Re-raise priviliges */

1831

errno = 0;

1832

ret = seteuid(0);

1833

if(ret == -1){

1834

perror_plus("seteuid");

1835

}

1836

1837

#ifdef __linux__

1838

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1839

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

1840

ret = klogctl(8, NULL, 5);

1841

bool restore_loglevel = true;

1842

if(ret == -1){

1843

restore_loglevel = false;

1844

perror_plus("klogctl");

1845

}

1846

#endif /* __linux__ */

1847

1848

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1849

if(sd < 0){

1850

perror_plus("socket");

1851

exitcode = EX_OSERR;

1852

#ifdef __linux__

1853

if(restore_loglevel){

1854

ret = klogctl(7, NULL, 0);

1855

if(ret == -1){

1856

perror_plus("klogctl");

1857

}

1858

}

1859

#endif /* __linux__ */

1860

/* Lower privileges */

1861

errno = 0;

1862

ret = seteuid(uid);

1863

if(ret == -1){

1864

perror_plus("seteuid");

1865

}

1866

goto end;

1867

}

1868

strcpy(network.ifr_name, interface);

1869

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

1870

if(ret == -1){

1871

perror_plus("ioctl SIOCGIFFLAGS");

1872

#ifdef __linux__

1873

if(restore_loglevel){

1874

ret = klogctl(7, NULL, 0);

1875

if(ret == -1){

1876

perror_plus("klogctl");

1877

}

1878

}

1879

#endif /* __linux__ */

1880

exitcode = EX_OSERR;

1881

/* Lower privileges */

1882

errno = 0;

1883

ret = seteuid(uid);

1884

if(ret == -1){

1885

perror_plus("seteuid");

1886

}

1887

goto end;

1888

}

1889

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

1890

network.ifr_flags |= IFF_UP;

1891

take_down_interface = true;

1892

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

1893

if(ret == -1){

1894

take_down_interface = false;

1895

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1896

exitcode = EX_OSERR;

1897

#ifdef __linux__

1898

if(restore_loglevel){

1899

ret = klogctl(7, NULL, 0);

1900

if(ret == -1){

1901

perror_plus("klogctl");

1902

}

1903

}

1904

#endif /* __linux__ */

1905

/* Lower privileges */

1906

errno = 0;

1907

ret = seteuid(uid);

1908

if(ret == -1){

1909

perror_plus("seteuid");

1910

}

1911

goto end;

1912

}

1913

}

1914

/* Sleep checking until interface is running.

1915

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

1916

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

1917

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

1918

if(ret == -1){

1919

perror_plus("ioctl SIOCGIFFLAGS");

1920

} else if(network.ifr_flags & IFF_RUNNING){

1921

break;

1922

}

1923

struct timespec sleeptime = { .tv_nsec = 250000000 };

1924

ret = nanosleep(&sleeptime, NULL);

1925

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

1926

perror_plus("nanosleep");

1927

}

1928

}

1929

if(not take_down_interface){

1930

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

1931

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

1932

if(ret == -1){

1933

perror_plus("close");

1934

}

1935

}

1936

#ifdef __linux__

1937

if(restore_loglevel){

1938

/* Restores kernel loglevel to default */

1939

ret = klogctl(7, NULL, 0);

1940

if(ret == -1){

1941

perror_plus("klogctl");

1942

}

1943

}

1944

#endif /* __linux__ */

1945

/* Lower privileges */

1946

errno = 0;

1947

if(take_down_interface){

1948

/* Lower privileges */

1949

ret = seteuid(uid);

1950

if(ret == -1){

1951

perror_plus("seteuid");

1952

}

2276

1953

} else {

2277

free(direntries);

2278

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

2279

exitcode = EXIT_FAILURE;

2280

goto end;

2281

}

2282

}

2283

2284

/* Bring up interfaces which are down, and remove any "none"s */

2285

{

2286

char *interface = NULL;

2287

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2288

interface))){

2289

/* If interface name is "none", stop bringing up interfaces.

2290

Also remove all instances of "none" from the list */

2291

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

2292

argz_delete(&mc.interfaces, &mc.interfaces_size,

2293

interface);

2294

interface = NULL;

2295

while((interface = argz_next(mc.interfaces,

2296

mc.interfaces_size, interface))){

2297

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

2298

argz_delete(&mc.interfaces, &mc.interfaces_size,

2299

interface);

2300

interface = NULL;

2301

}

2302

}

2303

break;

2304

}

2305

bool interface_was_up = interface_is_up(interface);

2306

errno = bring_up_interface(interface, delay);

2307

if(not interface_was_up){

2308

if(errno != 0){

2309

perror_plus("Failed to bring up interface");

2310

} else {

2311

errno = argz_add(&interfaces_to_take_down,

2312

&interfaces_to_take_down_size,

2313

interface);

2314

if(errno != 0){

2315

perror_plus("argz_add");

2316

}

2317

}

2318

}

2319

}

2320

if(debug and (interfaces_to_take_down == NULL)){

2321

fprintf_plus(stderr, "No interfaces were brought up\n");

2322

}

2323

}

2324

2325

/* If we only got one interface, explicitly use only that one */

2326

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2327

if(debug){

2328

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2329

mc.interfaces);

2330

}

2331

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

1954

/* Lower privileges permanently */

1955

ret = setuid(uid);

1956

if(ret == -1){

1957

perror_plus("setuid");

1958

}

1959

}

2332

1960

}

2333

1961

2334

1962

if(quit_now){

2335

1963

goto end;

2336

1964

}

2337

1965

2338

ret = init_gnutls_global(pubkey, seckey, &mc);

1966

ret = init_gnutls_global(pubkey, seckey);

2339

1967

if(ret == -1){

2340

1968

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

2341

1969

exitcode = EX_UNAVAILABLE;

2348

1976

goto end;

2349

1977

}

2350

1978

2351

/* Try /run/tmp before /tmp */

2352

tempdir = mkdtemp(run_tempdir);

2353

if(tempdir == NULL and errno == ENOENT){

2354

if(debug){

2355

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2356

run_tempdir, old_tempdir);

2357

}

2358

tempdir = mkdtemp(old_tempdir);

2359

}

2360

if(tempdir == NULL){

1979

if(mkdtemp(tempdir) == NULL){

2361

1980

perror_plus("mkdtemp");

2362

1981

goto end;

2363

1982

}

1983

tempdir_created = true;

2364

1984

2365

1985

if(quit_now){

2366

1986

goto end;

2367

1987

}

2368

1988

2369

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

1989

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

2370

1990

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

2371

1991

exitcode = EX_UNAVAILABLE;

2372

1992

goto end;

2382

2002

/* Connect directly, do not use Zeroconf */

2383

2003

/* (Mainly meant for debugging) */

2384

2004

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

2385

2386

2005

if(address == NULL){

2387

2006

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

2388

2007

exitcode = EX_USAGE;

2393

2012

goto end;

2394

2013

}

2395

2014

2396

in_port_t port;

2015

uint16_t port;

2397

2016

errno = 0;

2398

2017

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

2399

2018

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

2400

or tmpmax != (in_port_t)tmpmax){

2019

or tmpmax != (uint16_t)tmpmax){

2401

2020

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

2402

2021

exitcode = EX_USAGE;

2403

2022

goto end;

2404

2023

}

2405

2024

2406

2025

if(quit_now){

2407

2026

goto end;

2408

2027

}

2409

2028

2410

port = (in_port_t)tmpmax;

2029

port = (uint16_t)tmpmax;

2411

2030

*address = '\0';

2412

2031

/* Colon in address indicates IPv6 */

2413

2032

int af;

2429

2048

}

2430

2049

2431

2050

while(not quit_now){

2432

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

2433

&mc);

2051

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

2434

2052

if(quit_now or ret == 0){

2435

2053

break;

2436

2054

}

2437

2055

if(debug){

2438

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

2439

(int)retry_interval);

2056

fprintf_plus(stderr, "Retrying in %d seconds\n", (int)retry_interval);

2440

2057

}

2441

sleep((unsigned int)retry_interval);

2058

sleep((int)retry_interval);

2442

2059

}

2443

2060

2444

if(not quit_now){

2061

if (not quit_now){

2445

2062

exitcode = EXIT_SUCCESS;

2446

2063

}

2447

2064

2462

2079

config.publish_domain = 0;

2463

2080

2464

2081

/* Allocate a new server */

2465

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2466

&config, NULL, NULL, &ret_errno);

2082

mc.server = avahi_server_new(avahi_simple_poll_get

2083

(mc.simple_poll), &config, NULL,

2084

NULL, &error);

2467

2085

2468

2086

/* Free the Avahi configuration data */

2469

2087

avahi_server_config_free(&config);

2472

2090

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

2473

2091

if(mc.server == NULL){

2474

2092

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

2475

avahi_strerror(ret_errno));

2093

avahi_strerror(error));

2476

2094

exitcode = EX_UNAVAILABLE;

2477

2095

goto end;

2478

2096

}

2484

2102

/* Create the Avahi service browser */

2485

2103

sb = avahi_s_service_browser_new(mc.server, if_index,

2486

2104

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2487

NULL, 0, browse_callback,

2488

(void *)&mc);

2105

NULL, 0, browse_callback, NULL);

2489

2106

if(sb == NULL){

2490

2107

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

2491

avahi_strerror(avahi_server_errno(mc.server)));

2108

avahi_strerror(avahi_server_errno(mc.server)));

2492

2109

exitcode = EX_UNAVAILABLE;

2493

2110

goto end;

2494

2111

}

2502

2119

if(debug){

2503

2120

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

2504

2121

}

2505

2506

ret = avahi_loop_with_timeout(simple_poll,

2507

(int)(retry_interval * 1000), &mc);

2122

2123

ret = avahi_loop_with_timeout(mc.simple_poll,

2124

(int)(retry_interval * 1000));

2508

2125

if(debug){

2509

2126

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

2510

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

2127

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

2511

2128

}

2512

2129

2513

2130

end:

2517

2134

}

2518

2135

2519

2136

/* Cleanup things */

2520

free(mc.interfaces);

2521

2522

2137

if(sb != NULL)

2523

2138

avahi_s_service_browser_free(sb);

2524

2139

2525

2140

if(mc.server != NULL)

2526

2141

avahi_server_free(mc.server);

2527

2142

2528

if(simple_poll != NULL)

2529

avahi_simple_poll_free(simple_poll);

2143

if(mc.simple_poll != NULL)

2144

avahi_simple_poll_free(mc.simple_poll);

2530

2145

2531

2146

if(gnutls_initialized){

2532

2147

gnutls_certificate_free_credentials(mc.cred);

2537

2152

if(gpgme_initialized){

2538

2153

gpgme_release(mc.ctx);

2539

2154

}

2540

2155

2541

2156

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

2542

2157

has seen */

2543

2158

if(mc.current_server != NULL){

2549

2164

}

2550

2165

}

2551

2166

2552

/* Re-raise privileges */

2553

{

2554

ret_errno = raise_privileges();

2555

if(ret_errno != 0){

2556

perror_plus("Failed to raise privileges");

2557

} else {

2558

2559

/* Run network hooks */

2560

run_network_hooks("stop", interfaces_hooks != NULL ?

2561

interfaces_hooks : "", delay);

2562

2563

/* Take down the network interfaces which were brought up */

2564

{

2565

char *interface = NULL;

2566

while((interface=argz_next(interfaces_to_take_down,

2567

interfaces_to_take_down_size,

2568

interface))){

2569

ret_errno = take_down_interface(interface);

2570

if(ret_errno != 0){

2571

errno = ret_errno;

2572

perror_plus("Failed to take down interface");

2573

}

2574

}

2575

if(debug and (interfaces_to_take_down == NULL)){

2576

fprintf_plus(stderr, "No interfaces needed to be taken"

2577

" down\n");

2578

}

2579

}

2167

/* XXX run network hooks "stop" here */

2168

2169

/* Take down the network interface */

2170

if(take_down_interface){

2171

/* Re-raise priviliges */

2172

errno = 0;

2173

ret = seteuid(0);

2174

if(ret == -1){

2175

perror_plus("seteuid");

2580

2176

}

2581

2582

ret_errno = lower_privileges_permanently();

2583

if(ret_errno != 0){

2584

perror_plus("Failed to lower privileges permanently");

2177

if(geteuid() == 0){

2178

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

2179

if(ret == -1){

2180

perror_plus("ioctl SIOCGIFFLAGS");

2181

} else if(network.ifr_flags & IFF_UP){

2182

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

2183

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

2184

if(ret == -1){

2185

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2186

}

2187

}

2188

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

2189

if(ret == -1){

2190

perror_plus("close");

2191

}

2192

/* Lower privileges permanently */

2193

errno = 0;

2194

ret = setuid(uid);

2195

if(ret == -1){

2196

perror_plus("setuid");

2197

}

2585

2198

}

2586

2199

}

2587

2200

2588

free(interfaces_to_take_down);

2589

free(interfaces_hooks);

2590

2591

2201

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

2592

if(tempdir != NULL){

2202

if(tempdir_created){

2593

2203

struct dirent **direntries = NULL;

2594

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |

2595

O_NOFOLLOW));

2596

if(tempdir_fd == -1){

2597

perror_plus("open");

2598

} else {

2599

#ifdef __GLIBC__

2600

#if __GLIBC_PREREQ(2, 15)

2601

int numentries = scandirat(tempdir_fd, ".", &direntries,

2602

notdotentries, alphasort);

2603

#else /* not __GLIBC_PREREQ(2, 15) */

2604

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

2605

alphasort);

2606

#endif /* not __GLIBC_PREREQ(2, 15) */

2607

#else /* not __GLIBC__ */

2608

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

2609

alphasort);

2610

#endif /* not __GLIBC__ */

2611

if(numentries > 0){

2612

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

2613

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2614

if(ret == -1){

2615

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2616

" \"%s\", 0): %s\n", tempdir,

2617

direntries[i]->d_name, strerror(errno));

2618

}

2619

}

2620

2621

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

2622

free(direntries);

2623

if(numentries == -1){

2624

perror_plus("scandir");

2625

}

2626

ret = rmdir(tempdir);

2627

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

2628

perror_plus("rmdir");

2629

}

2204

struct dirent *direntry = NULL;

2205

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

2206

alphasort);

2207

if (numentries > 0){

2208

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

2209

direntry = direntries[i];

2210

char *fullname = NULL;

2211

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

2212

direntry->d_name);

2213

if(ret < 0){

2214

perror_plus("asprintf");

2215

continue;

2216

}

2217

ret = remove(fullname);

2218

if(ret == -1){

2219

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

2220

}

2221

free(fullname);

2630

2222

}

2631

TEMP_FAILURE_RETRY(close(tempdir_fd));

2223

}

2224

2225

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

2226

free(direntries);

2227

if (numentries == -1){

2228

perror_plus("scandir");

2229

}

2230

ret = rmdir(tempdir);

2231

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

2232

perror_plus("rmdir");

2632

2233

}

2633

2234

}

2634

2235