/mandos/trunk : revision 369

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

10

*

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* Everything else is

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13

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*

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

16

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

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* along with this program. If not, see

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

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*

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

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

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*/

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32

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

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stdout, ferror(), remove() */

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

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

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

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strtof(), abort() */

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

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srand(), strtof() */

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

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

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

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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

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

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

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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*/

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

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setgid() */

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

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

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78

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

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argp_state, struct argp,

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

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sigaction(), SIGTERM, sig_atomic_t,

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

90

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

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85

92

86

#ifdef __linux__

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87

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

111

105

init_gnutls_session(),

112

106

GNUTLS_* */

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107

#include <gnutls/openpgp.h>

114

/* 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 */

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117

111

/* GPGME */

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112

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

126

120

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

127

121

#define SECKEY "seckey.txt"

128

122

#define PUBKEY "pubkey.txt"

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

130

123

131

124

bool debug = false;

132

125

static const char mandos_protocol_version[] = "1";

133

126

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

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

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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 */

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typedef struct server{

141

const char *ip;

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uint16_t port;

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AvahiIfIndex if_index;

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int af;

145

struct timespec last_seen;

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struct server *next;

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struct server *prev;

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} server;

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

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128

150

129

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

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130

typedef struct {

156

135

gnutls_dh_params_t dh_params;

157

136

const char *priority;

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137

gpgme_ctx_t ctx;

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server *current_server;

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138

} mandos_context;

161

139

162

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

163

141

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

164

142

.dh_bits = 1024, .priority = "SECURE256"

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

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.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

}

143

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

186

144

187

145

/*

188

146

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

190

148

* "buffer_length" is how much is already used.

191

149

*/

192

150

size_t incbuffer(char **buffer, size_t buffer_length,

193

size_t buffer_capacity){

151

size_t buffer_capacity){

194

152

if(buffer_length + BUFFER_SIZE > buffer_capacity){

195

153

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

196

154

if(buffer == NULL){

201

159

return buffer_capacity;

202

160

}

203

161

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

241

162

/*

242

163

* Initialize GPGME.

243

164

*/

244

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

245

const char *tempdir){

165

static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

246

167

gpgme_error_t rc;

247

168

gpgme_engine_info_t engine_info;

248

169

257

178

258

179

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

259

180

if(fd == -1){

260

perror_plus("open");

181

perror("open");

261

182

return false;

262

183

}

263

184

264

185

rc = gpgme_data_new_from_fd(&pgp_data, fd);

265

186

if(rc != GPG_ERR_NO_ERROR){

266

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

267

gpgme_strsource(rc), gpgme_strerror(rc));

187

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

188

gpgme_strsource(rc), gpgme_strerror(rc));

268

189

return false;

269

190

}

270

191

271

192

rc = gpgme_op_import(mc.ctx, pgp_data);

272

193

if(rc != GPG_ERR_NO_ERROR){

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

194

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

195

gpgme_strsource(rc), gpgme_strerror(rc));

275

196

return false;

276

197

}

277

198

278

199

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

279

200

if(ret == -1){

280

perror_plus("close");

201

perror("close");

281

202

}

282

203

gpgme_data_release(pgp_data);

283

204

return true;

284

205

}

285

206

286

207

if(debug){

287

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

208

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

288

209

}

289

210

290

211

/* Init GPGME */

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gpgme_check_version(NULL);

292

213

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

293

214

if(rc != GPG_ERR_NO_ERROR){

294

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

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gpgme_strsource(rc), gpgme_strerror(rc));

215

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

216

gpgme_strsource(rc), gpgme_strerror(rc));

296

217

return false;

297

218

}

298

219

299

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

220

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

300

221

rc = gpgme_get_engine_info(&engine_info);

301

222

if(rc != GPG_ERR_NO_ERROR){

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

223

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

224

gpgme_strsource(rc), gpgme_strerror(rc));

304

225

return false;

305

226

}

306

227

while(engine_info != NULL){

312

233

engine_info = engine_info->next;

313

234

}

314

235

if(engine_info == NULL){

315

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

316

tempdir);

236

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

317

237

return false;

318

238

}

319

239

320

240

/* Create new GPGME "context" */

321

241

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

322

242

if(rc != GPG_ERR_NO_ERROR){

323

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

324

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

325

gpgme_strerror(rc));

243

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

244

gpgme_strsource(rc), gpgme_strerror(rc));

326

245

return false;

327

246

}

328

247

347

266

ssize_t plaintext_length = 0;

348

267

349

268

if(debug){

350

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

269

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

351

270

}

352

271

353

272

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

354

273

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

355

274

0);

356

275

if(rc != GPG_ERR_NO_ERROR){

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

359

278

return -1;

360

279

}

361

280

362

281

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

363

282

rc = gpgme_data_new(&dh_plain);

364

283

if(rc != GPG_ERR_NO_ERROR){

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

284

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

285

gpgme_strsource(rc), gpgme_strerror(rc));

368

286

gpgme_data_release(dh_crypto);

369

287

return -1;

370

288

}

373

291

data buffer */

374

292

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

375

293

if(rc != GPG_ERR_NO_ERROR){

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

378

296

plaintext_length = -1;

379

297

if(debug){

380

298

gpgme_decrypt_result_t result;

381

299

result = gpgme_op_decrypt_result(mc.ctx);

382

300

if(result == NULL){

383

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

301

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

384

302

} else {

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);

303

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

304

result->unsupported_algorithm);

305

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

306

result->wrong_key_usage);

389

307

if(result->file_name != NULL){

390

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

308

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

391

309

}

392

310

gpgme_recipient_t recipient;

393

311

recipient = result->recipients;

394

312

while(recipient != NULL){

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");

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");

402

319

recipient = recipient->next;

403

320

}

404

321

}

407

324

}

408

325

409

326

if(debug){

410

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

327

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

411

328

}

412

329

413

330

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

414

331

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

415

perror_plus("gpgme_data_seek");

332

perror("gpgme_data_seek");

416

333

plaintext_length = -1;

417

334

goto decrypt_end;

418

335

}

420

337

*plaintext = NULL;

421

338

while(true){

422

339

plaintext_capacity = incbuffer(plaintext,

423

(size_t)plaintext_length,

424

plaintext_capacity);

340

(size_t)plaintext_length,

341

plaintext_capacity);

425

342

if(plaintext_capacity == 0){

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

343

perror("incbuffer");

344

plaintext_length = -1;

345

goto decrypt_end;

429

346

}

430

347

431

348

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

436

353

break;

437

354

}

438

355

if(ret < 0){

439

perror_plus("gpgme_data_read");

356

perror("gpgme_data_read");

440

357

plaintext_length = -1;

441

358

goto decrypt_end;

442

359

}

444

361

}

445

362

446

363

if(debug){

447

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

364

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

448

365

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

449

366

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

450

367

}

472

389

/* GnuTLS log function callback */

473

390

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

474

391

const char* string){

475

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

392

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

476

393

}

477

394

478

395

static int init_gnutls_global(const char *pubkeyfilename,

480

397

int ret;

481

398

482

399

if(debug){

483

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

400

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

484

401

}

485

402

486

403

ret = gnutls_global_init();

487

404

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

405

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

406

safer_gnutls_strerror(ret));

490

407

return -1;

491

408

}

492

409

499

416

}

500

417

501

418

/* OpenPGP credentials */

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

419

gnutls_certificate_allocate_credentials(&mc.cred);

503

420

if(ret != GNUTLS_E_SUCCESS){

504

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

505

safer_gnutls_strerror(ret));

421

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

422

from

423

-Wunreachable-code

424

*/

425

safer_gnutls_strerror(ret));

506

426

gnutls_global_deinit();

507

427

return -1;

508

428

}

509

429

510

430

if(debug){

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

431

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

432

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

433

seckeyfilename);

515

434

}

516

435

517

436

ret = gnutls_certificate_set_openpgp_key_file

518

437

(mc.cred, pubkeyfilename, seckeyfilename,

519

438

GNUTLS_OPENPGP_FMT_BASE64);

520

439

if(ret != GNUTLS_E_SUCCESS){

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));

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));

526

445

goto globalfail;

527

446

}

528

447

529

448

/* GnuTLS server initialization */

530

449

ret = gnutls_dh_params_init(&mc.dh_params);

531

450

if(ret != GNUTLS_E_SUCCESS){

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

451

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

452

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

535

453

goto globalfail;

536

454

}

537

455

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

538

456

if(ret != GNUTLS_E_SUCCESS){

539

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

540

safer_gnutls_strerror(ret));

457

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

458

safer_gnutls_strerror(ret));

541

459

goto globalfail;

542

460

}

543

461

558

476

/* GnuTLS session creation */

559

477

do {

560

478

ret = gnutls_init(session, GNUTLS_SERVER);

561

if(quit_now){

562

return -1;

563

}

564

479

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

565

480

if(ret != GNUTLS_E_SUCCESS){

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

481

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

482

safer_gnutls_strerror(ret));

569

483

}

570

484

571

485

{

572

486

const char *err;

573

487

do {

574

488

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

575

if(quit_now){

576

gnutls_deinit(*session);

577

return -1;

578

}

579

489

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

580

490

if(ret != GNUTLS_E_SUCCESS){

581

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

582

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

583

safer_gnutls_strerror(ret));

491

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

492

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

493

safer_gnutls_strerror(ret));

584

494

gnutls_deinit(*session);

585

495

return -1;

586

496

}

589

499

do {

590

500

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

591

501

mc.cred);

592

if(quit_now){

593

gnutls_deinit(*session);

594

return -1;

595

}

596

502

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

597

503

if(ret != GNUTLS_E_SUCCESS){

598

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

599

safer_gnutls_strerror(ret));

504

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

505

safer_gnutls_strerror(ret));

600

506

gnutls_deinit(*session);

601

507

return -1;

602

508

}

613

519

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

614

520

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

615

521

522

sig_atomic_t quit_now = 0;

523

int signal_received = 0;

524

616

525

/* Called when a Mandos server is found */

617

526

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

618

527

AvahiIfIndex if_index,

624

533

struct sockaddr_in6 in6;

625

534

} to;

626

535

char *buffer = NULL;

627

char *decrypted_buffer = NULL;

536

char *decrypted_buffer;

628

537

size_t buffer_length = 0;

629

538

size_t buffer_capacity = 0;

630

539

size_t written;

631

int retval = -1;

540

int retval = 0;

632

541

gnutls_session_t session;

633

542

int pf; /* Protocol family */

634

543

635

errno = 0;

636

637

544

if(quit_now){

638

errno = EINTR;

639

545

return -1;

640

546

}

641

547

647

553

pf = PF_INET;

648

554

break;

649

555

default:

650

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

651

errno = EINVAL;

556

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

652

557

return -1;

653

558

}

654

559

658

563

}

659

564

660

565

if(debug){

661

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

662

PRIu16 "\n", ip, port);

566

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

567

"\n", ip, port);

663

568

}

664

569

665

570

tcp_sd = socket(pf, SOCK_STREAM, 0);

666

571

if(tcp_sd < 0){

667

int e = errno;

668

perror_plus("socket");

669

errno = e;

572

perror("socket");

573

retval = -1;

670

574

goto mandos_end;

671

575

}

672

576

673

577

if(quit_now){

674

errno = EINTR;

675

578

goto mandos_end;

676

579

}

677

580

684

587

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

685

588

}

686

589

if(ret < 0 ){

687

int e = errno;

688

perror_plus("inet_pton");

689

errno = e;

590

perror("inet_pton");

591

retval = -1;

690

592

goto mandos_end;

691

593

}

692

594

if(ret == 0){

693

int e = errno;

694

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

695

errno = e;

595

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

596

retval = -1;

696

597

goto mandos_end;

697

598

}

698

599

if(af == AF_INET6){

702

603

703

604

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

605

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

705

-Wunreachable-code*/

606

-Wunreachable-code*/

706

607

if(if_index == AVAHI_IF_UNSPEC){

707

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

708

" incomplete without a network interface\n");

709

errno = EINVAL;

608

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

609

" without a network interface\n");

610

retval = -1;

710

611

goto mandos_end;

711

612

}

712

613

/* Set the network interface number as scope */

719

620

}

720

621

721

622

if(quit_now){

722

errno = EINTR;

723

623

goto mandos_end;

724

624

}

725

625

727

627

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

728

628

char interface[IF_NAMESIZE];

729

629

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

730

perror_plus("if_indextoname");

630

perror("if_indextoname");

731

631

} else {

732

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

733

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

632

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

633

ip, interface, port);

734

634

}

735

635

} else {

736

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

737

ip, port);

636

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

637

port);

738

638

}

739

639

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

640

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

747

647

sizeof(addrstr));

748

648

}

749

649

if(pcret == NULL){

750

perror_plus("inet_ntop");

650

perror("inet_ntop");

751

651

} else {

752

652

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

753

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

653

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

754

654

}

755

655

}

756

656

}

757

657

758

658

if(quit_now){

759

errno = EINTR;

760

659

goto mandos_end;

761

660

}

762

661

766

665

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

767

666

}

768

667

if(ret < 0){

769

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

770

int e = errno;

771

perror_plus("connect");

772

errno = e;

773

}

668

perror("connect");

669

retval = -1;

774

670

goto mandos_end;

775

671

}

776

672

777

673

if(quit_now){

778

errno = EINTR;

779

674

goto mandos_end;

780

675

}

781

676

784

679

while(true){

785

680

size_t out_size = strlen(out);

786

681

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

787

out_size - written));

682

out_size - written));

788

683

if(ret == -1){

789

int e = errno;

790

perror_plus("write");

791

errno = e;

684

perror("write");

685

retval = -1;

792

686

goto mandos_end;

793

687

}

794

688

written += (size_t)ret;

804

698

}

805

699

806

700

if(quit_now){

807

errno = EINTR;

808

701

goto mandos_end;

809

702

}

810

703

}

811

704

812

705

if(debug){

813

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

706

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

814

707

}

815

708

816

709

if(quit_now){

817

errno = EINTR;

818

710

goto mandos_end;

819

711

}

820

712

821

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

822

713

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

823

714

824

715

if(quit_now){

825

errno = EINTR;

826

716

goto mandos_end;

827

717

}

828

718

829

719

do {

830

720

ret = gnutls_handshake(session);

831

721

if(quit_now){

832

errno = EINTR;

833

722

goto mandos_end;

834

723

}

835

724

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

836

725

837

726

if(ret != GNUTLS_E_SUCCESS){

838

727

if(debug){

839

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

728

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

840

729

gnutls_perror(ret);

841

730

}

842

errno = EPROTO;

731

retval = -1;

843

732

goto mandos_end;

844

733

}

845

734

846

735

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

847

736

848

737

if(debug){

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

738

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

739

ip);

851

740

}

852

741

853

742

while(true){

854

743

855

744

if(quit_now){

856

errno = EINTR;

857

745

goto mandos_end;

858

746

}

859

747

860

748

buffer_capacity = incbuffer(&buffer, buffer_length,

861

buffer_capacity);

749

buffer_capacity);

862

750

if(buffer_capacity == 0){

863

int e = errno;

864

perror_plus("incbuffer");

865

errno = e;

751

perror("incbuffer");

752

retval = -1;

866

753

goto mandos_end;

867

754

}

868

755

869

756

if(quit_now){

870

errno = EINTR;

871

757

goto mandos_end;

872

758

}

873

759

886

772

ret = gnutls_handshake(session);

887

773

888

774

if(quit_now){

889

errno = EINTR;

890

775

goto mandos_end;

891

776

}

892

777

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

893

778

if(ret < 0){

894

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

895

"***\n");

779

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

896

780

gnutls_perror(ret);

897

errno = EPROTO;

781

retval = -1;

898

782

goto mandos_end;

899

783

}

900

784

break;

901

785

default:

902

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

903

" encrypted session with Mandos server\n");

786

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

787

" encrypted session with Mandos server\n");

788

retval = -1;

904

789

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

errno = EIO;

906

790

goto mandos_end;

907

791

}

908

792

} else {

911

795

}

912

796

913

797

if(debug){

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);

798

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

799

}

800

801

if(quit_now){

802

goto mandos_end;

803

}

804

805

gnutls_bye(session, GNUTLS_SHUT_RDWR);

806

807

if(quit_now){

808

goto mandos_end;

809

}

929

810

930

811

if(buffer_length > 0){

931

812

ssize_t decrypted_buffer_size;

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

813

decrypted_buffer_size = pgp_packet_decrypt(buffer,

814

buffer_length,

933

815

&decrypted_buffer);

934

816

if(decrypted_buffer_size >= 0){

935

817

936

818

written = 0;

937

819

while(written < (size_t) decrypted_buffer_size){

938

820

if(quit_now){

939

errno = EINTR;

940

821

goto mandos_end;

941

822

}

942

823

944

825

(size_t)decrypted_buffer_size - written,

945

826

stdout);

946

827

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

947

int e = errno;

948

828

if(debug){

949

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

950

strerror(errno));

829

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

830

strerror(errno));

951

831

}

952

errno = e;

953

goto mandos_end;

832

retval = -1;

833

break;

954

834

}

955

835

written += (size_t)ret;

956

836

}

957

retval = 0;

837

free(decrypted_buffer);

838

} else {

839

retval = -1;

958

840

}

841

} else {

842

retval = -1;

959

843

}

960

844

961

845

/* Shutdown procedure */

962

846

963

847

mandos_end:

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

}

848

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

852

if(ret == -1){

853

perror("close");

854

}

855

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

983

858

}

984

859

return retval;

985

860

}

1010

885

switch(event){

1011

886

default:

1012

887

case AVAHI_RESOLVER_FAILURE:

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)));

888

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

889

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

890

avahi_strerror(avahi_server_errno(mc.server)));

1017

891

break;

1018

892

1019

893

case AVAHI_RESOLVER_FOUND:

1021

895

char ip[AVAHI_ADDRESS_STR_MAX];

1022

896

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

1023

897

if(debug){

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);

898

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

899

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

900

ip, (intmax_t)interface, port);

1027

901

}

1028

902

int ret = start_mandos_communication(ip, port, interface,

1029

903

avahi_proto_to_af(proto));

1030

904

if(ret == 0){

1031

905

avahi_simple_poll_quit(mc.simple_poll);

1032

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

1035

906

}

1036

907

}

1037

908

}

1061

932

default:

1062

933

case AVAHI_BROWSER_FAILURE:

1063

934

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

935

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

936

avahi_strerror(avahi_server_errno(mc.server)));

1066

937

avahi_simple_poll_quit(mc.simple_poll);

1067

938

return;

1068

939

1075

946

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

1076

947

name, type, domain, protocol, 0,

1077

948

resolve_callback, NULL) == NULL)

1078

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

1079

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

949

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

950

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

1081

951

break;

1082

952

1083

953

case AVAHI_BROWSER_REMOVE:

1086

956

case AVAHI_BROWSER_ALL_FOR_NOW:

1087

957

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1088

958

if(debug){

1089

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

1090

" searching...\n");

959

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

1091

960

}

1092

961

break;

1093

962

}

1094

963

}

1095

964

1096

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

965

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

1097

966

static void handle_sigterm(int sig){

1098

967

if(quit_now){

1099

968

return;

1101

970

quit_now = 1;

1102

971

signal_received = sig;

1103

972

int old_errno = errno;

1104

/* set main loop to exit */

1105

973

if(mc.simple_poll != NULL){

1106

974

avahi_simple_poll_quit(mc.simple_poll);

1107

975

}

1108

976

errno = old_errno;

1109

977

}

1110

978

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

fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());

1435

fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());

1436

dup2(devnull, STDIN_FILENO);

1437

close(devnull);

1438

dup2(STDERR_FILENO, STDOUT_FILENO);

1439

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

1440

if(ret == -1){

1441

perror_plus("setenv");

1442

_exit(EX_OSERR);

1443

}

1444

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

1445

if(ret == -1){

1446

perror_plus("setenv");

1447

_exit(EX_OSERR);

1448

}

1449

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

1450

if(ret == -1){

1451

perror_plus("setenv");

1452

_exit(EX_OSERR);

1453

}

1454

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

1455

if(ret == -1){

1456

perror_plus("setenv");

1457

_exit(EX_OSERR);

1458

}

1459

char *delaystring;

1460

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

1461

if(ret == -1){

1462

perror_plus("asprintf");

1463

_exit(EX_OSERR);

1464

}

1465

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

1466

if(ret == -1){

1467

free(delaystring);

1468

perror_plus("setenv");

1469

_exit(EX_OSERR);

1470

}

1471

free(delaystring);

1472

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

1473

perror_plus("execl");

1474

} else {

1475

int status;

1476

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

1477

perror_plus("waitpid");

1478

free(fullname);

1479

continue;

1480

}

1481

if(WIFEXITED(status)){

1482

if(WEXITSTATUS(status) != 0){

1483

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

1484

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

1485

WEXITSTATUS(status));

1486

free(fullname);

1487

continue;

1488

}

1489

} else if(WIFSIGNALED(status)){

1490

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

1491

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

1492

WTERMSIG(status));

1493

free(fullname);

1494

continue;

1495

} else {

1496

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

1497

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

1498

free(fullname);

1499

continue;

1500

}

1501

}

1502

free(fullname);

1503

if(debug){

1504

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

1505

direntry->d_name);

1506

}

1507

}

1508

close(devnull);

1509

}

1510

return true;

1511

}

1512

1513

979

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

1514

980

AvahiSServiceBrowser *sb = NULL;

1515

981

int error;

1517

983

intmax_t tmpmax;

1518

984

char *tmp;

1519

985

int exitcode = EXIT_SUCCESS;

1520

const char *interface = "";

986

const char *interface = "eth0";

1521

987

struct ifreq network;

1522

988

int sd = -1;

1523

989

bool take_down_interface = false;

1524

990

uid_t uid;

1525

991

gid_t gid;

992

char *connect_to = NULL;

1526

993

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

1527

994

bool tempdir_created = false;

1528

995

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1532

999

bool gnutls_initialized = false;

1533

1000

bool gpgme_initialized = false;

1534

1001

float delay = 2.5f;

1535

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

1536

retrying the same server again */

1537

1002

1538

1003

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1539

1004

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1545

1010

errno = 0;

1546

1011

ret = setgid(gid);

1547

1012

if(ret == -1){

1548

perror_plus("setgid");

1013

perror("setgid");

1549

1014

}

1550

1015

1551

1016

/* Lower user privileges (temporarily) */

1552

1017

errno = 0;

1553

1018

ret = seteuid(uid);

1554

1019

if(ret == -1){

1555

perror_plus("seteuid");

1020

perror("seteuid");

1556

1021

}

1557

1022

1558

1023

if(quit_now){

1593

1058

.arg = "SECONDS",

1594

1059

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

1595

1060

.group = 2 },

1596

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

1597

.arg = "SECONDS",

1598

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

1599

.group = 2 },

1600

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

1601

.arg = "DIR",

1602

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

1603

.group = 2 },

1604

/*

1605

* These reproduce what we would get without ARGP_NO_HELP

1606

*/

1607

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

1608

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

1609

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

1610

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

1611

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

1612

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

1613

1061

{ .name = NULL }

1614

1062

};

1615

1063

1616

1064

error_t parse_opt(int key, char *arg,

1617

1065

struct argp_state *state){

1618

errno = 0;

1619

1066

switch(key){

1620

1067

case 128: /* --debug */

1621

1068

debug = true;

1637

1084

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

1638

1085

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

1639

1086

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

1640

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

1087

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

1088

exit(EXIT_FAILURE);

1641

1089

}

1642

1090

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

1643

1091

break;

1648

1096

errno = 0;

1649

1097

delay = strtof(arg, &tmp);

1650

1098

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

1651

argp_error(state, "Bad delay");

1652

}

1653

case 132: /* --retry */

1654

errno = 0;

1655

retry_interval = strtod(arg, &tmp);

1656

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

1657

or (retry_interval * 1000) > INT_MAX

1658

or retry_interval < 0){

1659

argp_error(state, "Bad retry interval");

1660

}

1661

break;

1662

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

1663

hookdir = arg;

1664

break;

1665

/*

1666

* These reproduce what we would get without ARGP_NO_HELP

1667

*/

1668

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

1669

argp_state_help(state, state->out_stream,

1670

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1671

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1672

case -3: /* --usage */

1673

argp_state_help(state, state->out_stream,

1674

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1675

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

1676

fprintf_plus(state->out_stream,

1677

"Mandos plugin mandos-client: ");

1678

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

1679

exit(argp_err_exit_status);

1099

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

1100

exit(EXIT_FAILURE);

1101

}

1102

break;

1103

case ARGP_KEY_ARG:

1104

argp_usage(state);

1105

case ARGP_KEY_END:

1680

1106

break;

1681

1107

default:

1682

1108

return ARGP_ERR_UNKNOWN;

1683

1109

}

1684

return errno;

1110

return 0;

1685

1111

}

1686

1112

1687

1113

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

1688

1114

.args_doc = "",

1689

1115

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

1690

1116

" passwords from a Mandos server" };

1691

ret = argp_parse(&argp, argc, argv,

1692

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1693

switch(ret){

1694

case 0:

1695

break;

1696

case ENOMEM:

1697

default:

1698

errno = ret;

1699

perror_plus("argp_parse");

1700

exitcode = EX_OSERR;

1701

goto end;

1702

case EINVAL:

1703

exitcode = EX_USAGE;

1704

goto end;

1705

}

1706

}

1707

1708

{

1709

/* Work around Debian bug #633582:

1710

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

1711

1712

/* Re-raise priviliges */

1713

errno = 0;

1714

ret = seteuid(0);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

} else {

1718

struct stat st;

1719

1720

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

1721

int seckey_fd = open(seckey, O_RDONLY);

1722

if(seckey_fd == -1){

1723

perror_plus("open");

1724

} else {

1725

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

1726

if(ret == -1){

1727

perror_plus("fstat");

1728

} else {

1729

if(S_ISREG(st.st_mode)

1730

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

1731

ret = fchown(seckey_fd, uid, gid);

1732

if(ret == -1){

1733

perror_plus("fchown");

1734

}

1735

}

1736

}

1737

TEMP_FAILURE_RETRY(close(seckey_fd));

1738

}

1739

}

1740

1741

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

1742

int pubkey_fd = open(pubkey, O_RDONLY);

1743

if(pubkey_fd == -1){

1744

perror_plus("open");

1745

} else {

1746

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

1747

if(ret == -1){

1748

perror_plus("fstat");

1749

} else {

1750

if(S_ISREG(st.st_mode)

1751

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

1752

ret = fchown(pubkey_fd, uid, gid);

1753

if(ret == -1){

1754

perror_plus("fchown");

1755

}

1756

}

1757

}

1758

TEMP_FAILURE_RETRY(close(pubkey_fd));

1759

}

1760

}

1761

1762

/* Lower privileges */

1763

errno = 0;

1764

ret = seteuid(uid);

1765

if(ret == -1){

1766

perror_plus("seteuid");

1767

}

1768

}

1769

}

1770

1771

/* Run network hooks */

1772

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

1773

goto end;

1117

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

1118

if(ret == ARGP_ERR_UNKNOWN){

1119

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

1120

exitcode = EXIT_FAILURE;

1121

goto end;

1122

}

1774

1123

}

1775

1124

1776

1125

if(not debug){

1777

1126

avahi_set_log_function(empty_log);

1778

1127

}

1779

1128

1780

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

1781

struct dirent **direntries;

1782

/* First look for interfaces that are up */

1783

ret = scandir(sys_class_net, &direntries, up_interface,

1784

alphasort);

1785

if(ret == 0){

1786

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

1787

free(direntries);

1788

ret = scandir(sys_class_net, &direntries, good_interface,

1789

alphasort);

1790

}

1791

if(ret >= 1){

1792

/* Pick the first interface returned */

1793

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

1794

if(debug){

1795

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

1796

}

1797

if(interface == NULL){

1798

perror_plus("malloc");

1799

free(direntries);

1800

exitcode = EXIT_FAILURE;

1801

goto end;

1802

}

1803

free(direntries);

1804

} else {

1805

free(direntries);

1806

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

1807

exitcode = EXIT_FAILURE;

1808

goto end;

1809

}

1810

}

1811

1812

1129

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

1813

1130

from the signal handler */

1814

1131

/* Initialize the pseudo-RNG for Avahi */

1815

1132

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

1816

1133

mc.simple_poll = avahi_simple_poll_new();

1817

1134

if(mc.simple_poll == NULL){

1818

fprintf_plus(stderr,

1819

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

1820

exitcode = EX_UNAVAILABLE;

1135

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

1136

exitcode = EXIT_FAILURE;

1821

1137

goto end;

1822

1138

}

1823

1139

1824

1140

sigemptyset(&sigterm_action.sa_mask);

1825

1141

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

1826

1142

if(ret == -1){

1827

perror_plus("sigaddset");

1828

exitcode = EX_OSERR;

1143

perror("sigaddset");

1144

exitcode = EXIT_FAILURE;

1829

1145

goto end;

1830

1146

}

1831

1147

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

1832

1148

if(ret == -1){

1833

perror_plus("sigaddset");

1834

exitcode = EX_OSERR;

1149

perror("sigaddset");

1150

exitcode = EXIT_FAILURE;

1835

1151

goto end;

1836

1152

}

1837

1153

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

1838

1154

if(ret == -1){

1839

perror_plus("sigaddset");

1840

exitcode = EX_OSERR;

1155

perror("sigaddset");

1156

exitcode = EXIT_FAILURE;

1841

1157

goto end;

1842

1158

}

1843

1159

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

1846

1162

*/

1847

1163

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

1848

1164

if(ret == -1){

1849

perror_plus("sigaction");

1850

return EX_OSERR;

1165

perror("sigaction");

1166

return EXIT_FAILURE;

1851

1167

}

1852

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1853

1169

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

1854

1170

if(ret == -1){

1855

perror_plus("sigaction");

1856

exitcode = EX_OSERR;

1171

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1857

1173

goto end;

1858

1174

}

1859

1175

}

1860

1176

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

1861

1177

if(ret == -1){

1862

perror_plus("sigaction");

1863

return EX_OSERR;

1178

perror("sigaction");

1179

return EXIT_FAILURE;

1864

1180

}

1865

1181

if(old_sigterm_action.sa_handler != SIG_IGN){

1866

1182

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

1867

1183

if(ret == -1){

1868

perror_plus("sigaction");

1869

exitcode = EX_OSERR;

1184

perror("sigaction");

1185

exitcode = EXIT_FAILURE;

1870

1186

goto end;

1871

1187

}

1872

1188

}

1873

1189

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

1874

1190

if(ret == -1){

1875

perror_plus("sigaction");

1876

return EX_OSERR;

1191

perror("sigaction");

1192

return EXIT_FAILURE;

1877

1193

}

1878

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1879

1195

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

1880

1196

if(ret == -1){

1881

perror_plus("sigaction");

1882

exitcode = EX_OSERR;

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1883

1199

goto end;

1884

1200

}

1885

1201

}

1886

1202

1887

1203

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

1888

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

1204

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

1889

1205

if_index = (AvahiIfIndex) if_nametoindex(interface);

1890

1206

if(if_index == 0){

1891

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

1892

exitcode = EX_UNAVAILABLE;

1207

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

1208

exitcode = EXIT_FAILURE;

1893

1209

goto end;

1894

1210

}

1895

1211

1901

1217

errno = 0;

1902

1218

ret = seteuid(0);

1903

1219

if(ret == -1){

1904

perror_plus("seteuid");

1220

perror("seteuid");

1905

1221

}

1906

1222

1907

1223

#ifdef __linux__

1908

1224

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1909

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

1225

messages to mess up the prompt */

1910

1226

ret = klogctl(8, NULL, 5);

1911

1227

bool restore_loglevel = true;

1912

1228

if(ret == -1){

1913

1229

restore_loglevel = false;

1914

perror_plus("klogctl");

1230

perror("klogctl");

1915

1231

}

1916

1232

#endif /* __linux__ */

1917

1233

1918

1234

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1919

1235

if(sd < 0){

1920

perror_plus("socket");

1921

exitcode = EX_OSERR;

1236

perror("socket");

1237

exitcode = EXIT_FAILURE;

1922

1238

#ifdef __linux__

1923

1239

if(restore_loglevel){

1924

1240

ret = klogctl(7, NULL, 0);

1925

1241

if(ret == -1){

1926

perror_plus("klogctl");

1242

perror("klogctl");

1927

1243

}

1928

1244

}

1929

1245

#endif /* __linux__ */

1931

1247

errno = 0;

1932

1248

ret = seteuid(uid);

1933

1249

if(ret == -1){

1934

perror_plus("seteuid");

1250

perror("seteuid");

1935

1251

}

1936

1252

goto end;

1937

1253

}

1938

1254

strcpy(network.ifr_name, interface);

1939

1255

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

1940

1256

if(ret == -1){

1941

perror_plus("ioctl SIOCGIFFLAGS");

1257

perror("ioctl SIOCGIFFLAGS");

1942

1258

#ifdef __linux__

1943

1259

if(restore_loglevel){

1944

1260

ret = klogctl(7, NULL, 0);

1945

1261

if(ret == -1){

1946

perror_plus("klogctl");

1262

perror("klogctl");

1947

1263

}

1948

1264

}

1949

1265

#endif /* __linux__ */

1950

exitcode = EX_OSERR;

1266

exitcode = EXIT_FAILURE;

1951

1267

/* Lower privileges */

1952

1268

errno = 0;

1953

1269

ret = seteuid(uid);

1954

1270

if(ret == -1){

1955

perror_plus("seteuid");

1271

perror("seteuid");

1956

1272

}

1957

1273

goto end;

1958

1274

}

1962

1278

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

1963

1279

if(ret == -1){

1964

1280

take_down_interface = false;

1965

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1966

exitcode = EX_OSERR;

1281

perror("ioctl SIOCSIFFLAGS");

1282

exitcode = EXIT_FAILURE;

1967

1283

#ifdef __linux__

1968

1284

if(restore_loglevel){

1969

1285

ret = klogctl(7, NULL, 0);

1970

1286

if(ret == -1){

1971

perror_plus("klogctl");

1287

perror("klogctl");

1972

1288

}

1973

1289

}

1974

1290

#endif /* __linux__ */

1976

1292

errno = 0;

1977

1293

ret = seteuid(uid);

1978

1294

if(ret == -1){

1979

perror_plus("seteuid");

1295

perror("seteuid");

1980

1296

}

1981

1297

goto end;

1982

1298

}

1983

1299

}

1984

/* Sleep checking until interface is running.

1985

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

1300

/* sleep checking until interface is running */

1986

1301

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

1987

1302

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

1988

1303

if(ret == -1){

1989

perror_plus("ioctl SIOCGIFFLAGS");

1304

perror("ioctl SIOCGIFFLAGS");

1990

1305

} else if(network.ifr_flags & IFF_RUNNING){

1991

1306

break;

1992

1307

}

1993

1308

struct timespec sleeptime = { .tv_nsec = 250000000 };

1994

1309

ret = nanosleep(&sleeptime, NULL);

1995

1310

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

1996

perror_plus("nanosleep");

1311

perror("nanosleep");

1997

1312

}

1998

1313

}

1999

1314

if(not take_down_interface){

2000

1315

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

2001

1316

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

2002

1317

if(ret == -1){

2003

perror_plus("close");

1318

perror("close");

2004

1319

}

2005

1320

}

2006

1321

#ifdef __linux__

2008

1323

/* Restores kernel loglevel to default */

2009

1324

ret = klogctl(7, NULL, 0);

2010

1325

if(ret == -1){

2011

perror_plus("klogctl");

1326

perror("klogctl");

2012

1327

}

2013

1328

}

2014

1329

#endif /* __linux__ */

2015

1330

/* Lower privileges */

2016

1331

errno = 0;

2017

/* Lower privileges */

2018

ret = seteuid(uid);

2019

if(ret == -1){

2020

perror_plus("seteuid");

1332

if(take_down_interface){

1333

/* Lower privileges */

1334

ret = seteuid(uid);

1335

if(ret == -1){

1336

perror("seteuid");

1337

}

1338

} else {

1339

/* Lower privileges permanently */

1340

ret = setuid(uid);

1341

if(ret == -1){

1342

perror("setuid");

1343

}

2021

1344

}

2022

1345

}

2023

1346

2027

1350

2028

1351

ret = init_gnutls_global(pubkey, seckey);

2029

1352

if(ret == -1){

2030

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

2031

exitcode = EX_UNAVAILABLE;

1353

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

1354

exitcode = EXIT_FAILURE;

2032

1355

goto end;

2033

1356

} else {

2034

1357

gnutls_initialized = true;

2038

1361

goto end;

2039

1362

}

2040

1363

1364

tempdir_created = true;

2041

1365

if(mkdtemp(tempdir) == NULL){

2042

perror_plus("mkdtemp");

1366

tempdir_created = false;

1367

perror("mkdtemp");

2043

1368

goto end;

2044

1369

}

2045

tempdir_created = true;

2046

1370

2047

1371

if(quit_now){

2048

1372

goto end;

2049

1373

}

2050

1374

2051

1375

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

2052

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

2053

exitcode = EX_UNAVAILABLE;

1376

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

1377

exitcode = EXIT_FAILURE;

2054

1378

goto end;

2055

1379

} else {

2056

1380

gpgme_initialized = true;

2065

1389

/* (Mainly meant for debugging) */

2066

1390

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

2067

1391

if(address == NULL){

2068

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

2069

exitcode = EX_USAGE;

1392

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

1393

exitcode = EXIT_FAILURE;

2070

1394

goto end;

2071

1395

}

2072

1396

2079

1403

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

2080

1404

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

2081

1405

or tmpmax != (uint16_t)tmpmax){

2082

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

2083

exitcode = EX_USAGE;

1406

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

1407

exitcode = EXIT_FAILURE;

2084

1408

goto end;

2085

1409

}

2086

1410

2090

1414

2091

1415

port = (uint16_t)tmpmax;

2092

1416

*address = '\0';

1417

address = connect_to;

2093

1418

/* Colon in address indicates IPv6 */

2094

1419

int af;

2095

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

1420

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

2096

1421

af = AF_INET6;

2097

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

2098

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

2099

{

2100

connect_to++;

2101

address[-1] = '\0';

2102

}

2103

1422

} else {

2104

1423

af = AF_INET;

2105

1424

}

2106

address = connect_to;

2107

1425

2108

1426

if(quit_now){

2109

1427

goto end;

2110

1428

}

2111

1429

2112

while(not quit_now){

2113

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

2114

if(quit_now or ret == 0){

2115

break;

2116

}

2117

if(debug){

2118

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

2119

(int)retry_interval);

2120

}

2121

sleep((int)retry_interval);

2122

}

2123

2124

if (not quit_now){

1430

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

1431

if(ret < 0){

1432

exitcode = EXIT_FAILURE;

1433

} else {

2125

1434

exitcode = EXIT_SUCCESS;

2126

1435

}

2127

2128

1436

goto end;

2129

1437

}

2130

1438

2152

1460

2153

1461

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

2154

1462

if(mc.server == NULL){

2155

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

2156

avahi_strerror(error));

2157

exitcode = EX_UNAVAILABLE;

1463

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

1464

avahi_strerror(error));

1465

exitcode = EXIT_FAILURE;

2158

1466

goto end;

2159

1467

}

2160

1468

2167

1475

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2168

1476

NULL, 0, browse_callback, NULL);

2169

1477

if(sb == NULL){

2170

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

2171

avahi_strerror(avahi_server_errno(mc.server)));

2172

exitcode = EX_UNAVAILABLE;

1478

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

1479

avahi_strerror(avahi_server_errno(mc.server)));

1480

exitcode = EXIT_FAILURE;

2173

1481

goto end;

2174

1482

}

2175

1483

2180

1488

/* Run the main loop */

2181

1489

2182

1490

if(debug){

2183

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

2184

}

2185

2186

ret = avahi_loop_with_timeout(mc.simple_poll,

2187

(int)(retry_interval * 1000));

2188

if(debug){

2189

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

2190

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

2191

}

1491

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

1492

}

1493

1494

avahi_simple_poll_loop(mc.simple_poll);

2192

1495

2193

1496

end:

2194

1497

2195

1498

if(debug){

2196

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

1499

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

2197

1500

}

2198

1501

2199

1502

/* Cleanup things */

2216

1519

gpgme_release(mc.ctx);

2217

1520

}

2218

1521

2219

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

2220

has seen */

2221

if(mc.current_server != NULL){

2222

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

2223

while(mc.current_server != NULL){

2224

server *next = mc.current_server->next;

2225

free(mc.current_server);

2226

mc.current_server = next;

2227

}

2228

}

2229

2230

/* Run network hooks */

2231

run_network_hooks("stop", interface, delay);

2232

2233

/* Re-raise priviliges */

2234

{

1522

/* Take down the network interface */

1523

if(take_down_interface){

1524

/* Re-raise priviliges */

2235

1525

errno = 0;

2236

1526

ret = seteuid(0);

2237

1527

if(ret == -1){

2238

perror_plus("seteuid");

1528

perror("seteuid");

2239

1529

}

2240

2241

/* Take down the network interface */

2242

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

1530

if(geteuid() == 0){

2243

1531

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

2244

1532

if(ret == -1){

2245

perror_plus("ioctl SIOCGIFFLAGS");

2246

} else if(network.ifr_flags & IFF_UP){

2247

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

1533

perror("ioctl SIOCGIFFLAGS");

1534

} else if(network.ifr_flags & IFF_UP) {

1535

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

2248

1536

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

2249

1537

if(ret == -1){

2250

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1538

perror("ioctl SIOCSIFFLAGS");

2251

1539

}

2252

1540

}

2253

1541

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

2254

1542

if(ret == -1){

2255

perror_plus("close");

1543

perror("close");

1544

}

1545

/* Lower privileges permanently */

1546

errno = 0;

1547

ret = setuid(uid);

1548

if(ret == -1){

1549

perror("setuid");

2256

1550

}

2257

1551

}

2258

1552

}

2259

/* Lower privileges permanently */

2260

errno = 0;

2261

ret = setuid(uid);

2262

if(ret == -1){

2263

perror_plus("setuid");

2264

}

2265

1553

2266

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

1554

/* Removes the temp directory used by GPGME */

2267

1555

if(tempdir_created){

2268

struct dirent **direntries = NULL;

2269

struct dirent *direntry = NULL;

2270

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

2271

alphasort);

2272

if (numentries > 0){

2273

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

2274

direntry = direntries[i];

1556

DIR *d;

1557

struct dirent *direntry;

1558

d = opendir(tempdir);

1559

if(d == NULL){

1560

if(errno != ENOENT){

1561

perror("opendir");

1562

}

1563

} else {

1564

while(true){

1565

direntry = readdir(d);

1566

if(direntry == NULL){

1567

break;

1568

}

1569

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

1570

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

1571

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

1572

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

1573

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

1574

continue;

1575

}

2275

1576

char *fullname = NULL;

2276

1577

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

2277

1578

direntry->d_name);

2278

1579

if(ret < 0){

2279

perror_plus("asprintf");

1580

perror("asprintf");

2280

1581

continue;

2281

1582

}

2282

1583

ret = remove(fullname);

2283

1584

if(ret == -1){

2284

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

2285

strerror(errno));

1585

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

1586

strerror(errno));

2286

1587

}

2287

1588

free(fullname);

2288

1589

}

2289

}

2290

2291

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

2292

free(direntries);

2293

if (numentries == -1){

2294

perror_plus("scandir");

1590

closedir(d);

2295

1591

}

2296

1592

ret = rmdir(tempdir);

2297

1593

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

2298

perror_plus("rmdir");

1594

perror("rmdir");

2299

1595

}

2300

1596

}

2301

1597

2302

1598

if(quit_now){

2303

1599

sigemptyset(&old_sigterm_action.sa_mask);

2304

1600

old_sigterm_action.sa_handler = SIG_DFL;

2305

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2306

&old_sigterm_action,

2307

NULL));

1601

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

2308

1602

if(ret == -1){

2309

perror_plus("sigaction");

2310

}

2311

do {

2312

ret = raise(signal_received);

2313

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

2314

if(ret != 0){

2315

perror_plus("raise");

2316

abort();

2317

}

2318

TEMP_FAILURE_RETRY(pause());

1603

perror("sigaction");

1604

}

1605

raise(signal_received);

2319

1606

}

2320

1607

2321

1608

return exitcode;