/mandos/trunk : revision 594.1.3

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

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*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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32

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

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

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stdout, ferror(), remove() */

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

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#include <stdint.h> /* uint16_t, uint32_t, intptr_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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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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

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strtoimax() */

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

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

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

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program_invocation_short_name */

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

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

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SIOCSIFFLAGS, if_indextoname(),

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*/

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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() */

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

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

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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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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() */

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

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91

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92

#ifdef __linux__

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93

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

107

111

init_gnutls_session(),

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112

GNUTLS_* */

109

113

#include <gnutls/openpgp.h>

110

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

114

/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

112

116

113

117

/* GPGME */

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118

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

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126

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

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127

#define SECKEY "seckey.txt"

124

128

#define PUBKEY "pubkey.txt"

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

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130

126

131

bool debug = false;

127

132

static const char mandos_protocol_version[] = "1";

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133

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

129

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

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

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135

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

131

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

139

gid_t gid = 65534;

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141

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

142

typedef struct server{

143

const char *ip;

144

uint16_t port;

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AvahiIfIndex if_index;

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int af;

147

struct timespec last_seen;

148

struct server *next;

149

struct server *prev;

150

} server;

132

151

133

152

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

134

153

typedef struct {

139

158

gnutls_dh_params_t dh_params;

140

159

const char *priority;

141

160

gpgme_ctx_t ctx;

161

server *current_server;

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162

} mandos_context;

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163

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

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

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166

.dh_bits = 1024, .priority = "SECURE256"

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

167

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

168

.current_server = NULL };

148

169

149

170

sig_atomic_t quit_now = 0;

150

171

int signal_received = 0;

151

172

173

/* Function to use when printing errors */

174

void perror_plus(const char *print_text){

175

int e = errno;

176

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

177

program_invocation_short_name);

178

errno = e;

179

perror(print_text);

180

}

181

182

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

183

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

184

va_list ap;

185

va_start (ap, format);

186

187

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

188

program_invocation_short_name));

189

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

190

}

191

152

192

/*

153

193

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

154

194

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

155

195

* "buffer_length" is how much is already used.

156

196

*/

157

197

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

198

size_t buffer_capacity){

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199

if(buffer_length + BUFFER_SIZE > buffer_capacity){

160

200

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

161

201

if(buffer == NULL){

166

206

return buffer_capacity;

167

207

}

168

208

209

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

210

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

211

int af){

212

int ret;

213

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

214

if(new_server == NULL){

215

perror_plus("malloc");

216

return false;

217

}

218

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

219

.port = port,

220

.if_index = if_index,

221

.af = af };

222

if(new_server->ip == NULL){

223

perror_plus("strdup");

224

return false;

225

}

226

/* Special case of first server */

227

if (mc.current_server == NULL){

228

new_server->next = new_server;

229

new_server->prev = new_server;

230

mc.current_server = new_server;

231

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

232

} else {

233

new_server->next = mc.current_server;

234

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

235

new_server->prev->next = new_server;

236

mc.current_server->prev = new_server;

237

}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

242

}

243

return true;

244

}

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169

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/*

170

247

* Initialize GPGME.

171

248

*/

172

static bool init_gpgme(const char *seckey,

173

const char *pubkey, const char *tempdir){

249

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

250

const char *tempdir){

174

251

gpgme_error_t rc;

175

252

gpgme_engine_info_t engine_info;

176

253

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

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if(fd == -1){

188

perror("open");

265

perror_plus("open");

189

266

return false;

190

267

}

191

268

192

269

rc = gpgme_data_new_from_fd(&pgp_data, fd);

193

270

if(rc != GPG_ERR_NO_ERROR){

194

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

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gpgme_strsource(rc), gpgme_strerror(rc));

271

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

272

gpgme_strsource(rc), gpgme_strerror(rc));

196

273

return false;

197

274

}

198

275

199

276

rc = gpgme_op_import(mc.ctx, pgp_data);

200

277

if(rc != GPG_ERR_NO_ERROR){

201

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

202

gpgme_strsource(rc), gpgme_strerror(rc));

278

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

279

gpgme_strsource(rc), gpgme_strerror(rc));

203

280

return false;

204

281

}

205

282

206

283

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

207

284

if(ret == -1){

208

perror("close");

285

perror_plus("close");

209

286

}

210

287

gpgme_data_release(pgp_data);

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288

return true;

212

289

}

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290

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if(debug){

215

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

292

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

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}

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/* Init GPGME */

219

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gpgme_check_version(NULL);

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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298

if(rc != GPG_ERR_NO_ERROR){

222

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

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gpgme_strsource(rc), gpgme_strerror(rc));

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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302

}

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303

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

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

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305

rc = gpgme_get_engine_info(&engine_info);

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306

if(rc != GPG_ERR_NO_ERROR){

230

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

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gpgme_strsource(rc), gpgme_strerror(rc));

307

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

308

gpgme_strsource(rc), gpgme_strerror(rc));

232

309

return false;

233

310

}

234

311

while(engine_info != NULL){

240

317

engine_info = engine_info->next;

241

318

}

242

319

if(engine_info == NULL){

243

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

320

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

321

tempdir);

244

322

return false;

245

323

}

246

324

247

325

/* Create new GPGME "context" */

248

326

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

249

327

if(rc != GPG_ERR_NO_ERROR){

250

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

251

gpgme_strsource(rc), gpgme_strerror(rc));

328

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

329

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

330

gpgme_strerror(rc));

252

331

return false;

253

332

}

254

333

273

352

ssize_t plaintext_length = 0;

274

353

275

354

if(debug){

276

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

355

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

277

356

}

278

357

279

358

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

280

359

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

281

360

0);

282

361

if(rc != GPG_ERR_NO_ERROR){

283

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

284

gpgme_strsource(rc), gpgme_strerror(rc));

362

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

363

gpgme_strsource(rc), gpgme_strerror(rc));

285

364

return -1;

286

365

}

287

366

288

367

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

289

368

rc = gpgme_data_new(&dh_plain);

290

369

if(rc != GPG_ERR_NO_ERROR){

291

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

292

gpgme_strsource(rc), gpgme_strerror(rc));

370

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

371

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

372

gpgme_strsource(rc), gpgme_strerror(rc));

293

373

gpgme_data_release(dh_crypto);

294

374

return -1;

295

375

}

298

378

data buffer */

299

379

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

300

380

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

381

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

382

gpgme_strsource(rc), gpgme_strerror(rc));

303

383

plaintext_length = -1;

304

384

if(debug){

305

385

gpgme_decrypt_result_t result;

306

386

result = gpgme_op_decrypt_result(mc.ctx);

307

387

if(result == NULL){

308

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

388

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

309

389

} else {

310

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

311

result->unsupported_algorithm);

312

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

313

result->wrong_key_usage);

390

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

391

result->unsupported_algorithm);

392

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

393

result->wrong_key_usage);

314

394

if(result->file_name != NULL){

315

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

395

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

316

396

}

317

397

gpgme_recipient_t recipient;

318

398

recipient = result->recipients;

319

399

while(recipient != NULL){

320

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

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

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

323

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

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

400

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

401

gpgme_pubkey_algo_name

402

(recipient->pubkey_algo));

403

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

404

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

405

recipient->status == GPG_ERR_NO_SECKEY

406

? "No" : "Yes");

326

407

recipient = recipient->next;

327

408

}

328

409

}

331

412

}

332

413

333

414

if(debug){

334

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

415

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

335

416

}

336

417

337

418

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

338

419

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

339

perror("gpgme_data_seek");

420

perror_plus("gpgme_data_seek");

340

421

plaintext_length = -1;

341

422

goto decrypt_end;

342

423

}

344

425

*plaintext = NULL;

345

426

while(true){

346

427

plaintext_capacity = incbuffer(plaintext,

347

(size_t)plaintext_length,

348

plaintext_capacity);

428

(size_t)plaintext_length,

429

plaintext_capacity);

349

430

if(plaintext_capacity == 0){

350

perror("incbuffer");

351

plaintext_length = -1;

352

goto decrypt_end;

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

353

434

}

354

435

355

436

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

360

441

break;

361

442

}

362

443

if(ret < 0){

363

perror("gpgme_data_read");

444

perror_plus("gpgme_data_read");

364

445

plaintext_length = -1;

365

446

goto decrypt_end;

366

447

}

368

449

}

369

450

370

451

if(debug){

371

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

452

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

372

453

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

373

454

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

374

455

}

396

477

/* GnuTLS log function callback */

397

478

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

398

479

const char* string){

399

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

480

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

400

481

}

401

482

402

483

static int init_gnutls_global(const char *pubkeyfilename,

404

485

int ret;

405

486

406

487

if(debug){

407

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

488

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

408

489

}

409

490

410

491

ret = gnutls_global_init();

411

492

if(ret != GNUTLS_E_SUCCESS){

412

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

413

safer_gnutls_strerror(ret));

493

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

494

safer_gnutls_strerror(ret));

414

495

return -1;

415

496

}

416

497

423

504

}

424

505

425

506

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

508

if(ret != GNUTLS_E_SUCCESS){

428

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

429

from

430

-Wunreachable-code

431

*/

432

safer_gnutls_strerror(ret));

509

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

510

safer_gnutls_strerror(ret));

433

511

gnutls_global_deinit();

434

512

return -1;

435

513

}

436

514

437

515

if(debug){

438

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

439

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

440

seckeyfilename);

516

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

517

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

518

pubkeyfilename,

519

seckeyfilename);

441

520

}

442

521

443

522

ret = gnutls_certificate_set_openpgp_key_file

444

523

(mc.cred, pubkeyfilename, seckeyfilename,

445

524

GNUTLS_OPENPGP_FMT_BASE64);

446

525

if(ret != GNUTLS_E_SUCCESS){

447

fprintf(stderr,

448

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

449

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

450

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

451

safer_gnutls_strerror(ret));

526

fprintf_plus(stderr,

527

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

528

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

529

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

530

safer_gnutls_strerror(ret));

452

531

goto globalfail;

453

532

}

454

533

455

534

/* GnuTLS server initialization */

456

535

ret = gnutls_dh_params_init(&mc.dh_params);

457

536

if(ret != GNUTLS_E_SUCCESS){

458

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

459

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

537

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

" initialization: %s\n",

539

safer_gnutls_strerror(ret));

460

540

goto globalfail;

461

541

}

462

542

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

463

543

if(ret != GNUTLS_E_SUCCESS){

464

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

465

safer_gnutls_strerror(ret));

544

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

545

safer_gnutls_strerror(ret));

466

546

goto globalfail;

467

547

}

468

548

488

568

}

489

569

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

490

570

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

571

fprintf_plus(stderr,

572

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

573

safer_gnutls_strerror(ret));

493

574

}

494

575

495

576

{

502

583

}

503

584

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

504

585

if(ret != GNUTLS_E_SUCCESS){

505

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

506

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

507

safer_gnutls_strerror(ret));

586

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

587

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

588

safer_gnutls_strerror(ret));

508

589

gnutls_deinit(*session);

509

590

return -1;

510

591

}

519

600

}

520

601

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

521

602

if(ret != GNUTLS_E_SUCCESS){

522

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

523

safer_gnutls_strerror(ret));

603

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

604

safer_gnutls_strerror(ret));

524

605

gnutls_deinit(*session);

525

606

return -1;

526

607

}

571

652

pf = PF_INET;

572

653

break;

573

654

default:

574

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

655

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

575

656

errno = EINVAL;

576

657

return -1;

577

658

}

582

663

}

583

664

584

665

if(debug){

585

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

586

"\n", ip, port);

666

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

667

PRIu16 "\n", ip, port);

587

668

}

588

669

589

670

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

671

if(tcp_sd < 0){

591

672

int e = errno;

592

perror("socket");

673

perror_plus("socket");

593

674

errno = e;

594

675

goto mandos_end;

595

676

}

609

690

}

610

691

if(ret < 0 ){

611

692

int e = errno;

612

perror("inet_pton");

693

perror_plus("inet_pton");

613

694

errno = e;

614

695

goto mandos_end;

615

696

}

616

697

if(ret == 0){

617

698

int e = errno;

618

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

699

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

619

700

errno = e;

620

701

goto mandos_end;

621

702

}

626

707

627

708

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

628

709

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

629

-Wunreachable-code*/

710

-Wunreachable-code*/

630

711

if(if_index == AVAHI_IF_UNSPEC){

631

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

632

" without a network interface\n");

712

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

713

" incomplete without a network interface\n");

633

714

errno = EINVAL;

634

715

goto mandos_end;

635

716

}

651

732

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

652

733

char interface[IF_NAMESIZE];

653

734

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

654

perror("if_indextoname");

735

perror_plus("if_indextoname");

655

736

} else {

656

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

657

ip, interface, port);

737

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

738

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

658

739

}

659

740

} else {

660

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

661

port);

741

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

742

ip, port);

662

743

}

663

744

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

664

745

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

671

752

sizeof(addrstr));

672

753

}

673

754

if(pcret == NULL){

674

perror("inet_ntop");

755

perror_plus("inet_ntop");

675

756

} else {

676

757

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

677

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

758

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

678

759

}

679

760

}

680

761

}

692

773

if(ret < 0){

693

774

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

694

775

int e = errno;

695

perror("connect");

776

perror_plus("connect");

696

777

errno = e;

697

778

}

698

779

goto mandos_end;

708

789

while(true){

709

790

size_t out_size = strlen(out);

710

791

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

711

out_size - written));

792

out_size - written));

712

793

if(ret == -1){

713

794

int e = errno;

714

perror("write");

795

perror_plus("write");

715

796

errno = e;

716

797

goto mandos_end;

717

798

}

734

815

}

735

816

736

817

if(debug){

737

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

818

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

738

819

}

739

820

740

821

if(quit_now){

742

823

goto mandos_end;

743

824

}

744

825

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

826

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

827

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

828

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

829

gnutls_transport_set_ptr(session,

830

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

746

831

747

832

if(quit_now){

748

833

errno = EINTR;

759

844

760

845

if(ret != GNUTLS_E_SUCCESS){

761

846

if(debug){

762

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

847

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

763

848

gnutls_perror(ret);

764

849

}

765

850

errno = EPROTO;

769

854

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

770

855

771

856

if(debug){

772

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

773

ip);

857

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

858

" %s\n", ip);

774

859

}

775

860

776

861

while(true){

781

866

}

782

867

783

868

buffer_capacity = incbuffer(&buffer, buffer_length,

784

buffer_capacity);

869

buffer_capacity);

785

870

if(buffer_capacity == 0){

786

871

int e = errno;

787

perror("incbuffer");

872

perror_plus("incbuffer");

788

873

errno = e;

789

874

goto mandos_end;

790

875

}

814

899

}

815

900

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

816

901

if(ret < 0){

817

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

902

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

903

"***\n");

818

904

gnutls_perror(ret);

819

905

errno = EPROTO;

820

906

goto mandos_end;

821

907

}

822

908

break;

823

909

default:

824

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

825

" encrypted session with Mandos server\n");

910

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

911

" encrypted session with Mandos server\n");

826

912

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

913

errno = EIO;

828

914

goto mandos_end;

833

919

}

834

920

835

921

if(debug){

836

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

922

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

837

923

}

838

924

839

925

if(quit_now){

851

937

852

938

if(buffer_length > 0){

853

939

ssize_t decrypted_buffer_size;

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

buffer_length,

940

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

856

941

&decrypted_buffer);

857

942

if(decrypted_buffer_size >= 0){

858

943

869

954

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

870

955

int e = errno;

871

956

if(debug){

872

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

873

strerror(errno));

957

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

958

strerror(errno));

874

959

}

875

960

errno = e;

876

961

goto mandos_end;

895

980

if(e == 0){

896

981

e = errno;

897

982

}

898

perror("close");

983

perror_plus("close");

899

984

}

900

985

gnutls_deinit(session);

986

errno = e;

901

987

if(quit_now){

902

e = EINTR;

988

errno = EINTR;

903

989

retval = -1;

904

990

}

905

errno = e;

906

991

}

907

992

return retval;

908

993

}

933

1018

switch(event){

934

1019

default:

935

1020

case AVAHI_RESOLVER_FAILURE:

936

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

937

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

938

avahi_strerror(avahi_server_errno(mc.server)));

1021

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

1022

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

1023

domain,

1024

avahi_strerror(avahi_server_errno(mc.server)));

939

1025

break;

940

1026

941

1027

case AVAHI_RESOLVER_FOUND:

943

1029

char ip[AVAHI_ADDRESS_STR_MAX];

944

1030

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

945

1031

if(debug){

946

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

947

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

948

ip, (intmax_t)interface, port);

1032

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

1033

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

1034

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

949

1035

}

950

1036

int ret = start_mandos_communication(ip, port, interface,

951

1037

avahi_proto_to_af(proto));

952

1038

if(ret == 0){

953

1039

avahi_simple_poll_quit(mc.simple_poll);

1040

} else {

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1043

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

1044

" list\n", name);

1045

}

954

1046

}

955

1047

}

956

1048

}

980

1072

default:

981

1073

case AVAHI_BROWSER_FAILURE:

982

1074

983

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

984

avahi_strerror(avahi_server_errno(mc.server)));

1075

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

1076

avahi_strerror(avahi_server_errno(mc.server)));

985

1077

avahi_simple_poll_quit(mc.simple_poll);

986

1078

return;

987

1079

994

1086

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

995

1087

name, type, domain, protocol, 0,

996

1088

resolve_callback, NULL) == NULL)

997

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

998

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

1089

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

1090

" %s\n", name,

1091

avahi_strerror(avahi_server_errno(mc.server)));

999

1092

break;

1000

1093

1001

1094

case AVAHI_BROWSER_REMOVE:

1004

1097

case AVAHI_BROWSER_ALL_FOR_NOW:

1005

1098

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1006

1099

if(debug){

1007

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

1100

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

1101

" searching...\n");

1008

1102

}

1009

1103

break;

1010

1104

}

1011

1105

}

1012

1106

1013

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

1107

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

1014

1108

static void handle_sigterm(int sig){

1015

1109

if(quit_now){

1016

1110

return;

1018

1112

quit_now = 1;

1019

1113

signal_received = sig;

1020

1114

int old_errno = errno;

1115

/* set main loop to exit */

1021

1116

if(mc.simple_poll != NULL){

1022

1117

avahi_simple_poll_quit(mc.simple_poll);

1023

1118

}

1024

1119

errno = old_errno;

1025

1120

}

1026

1121

1027

/*

1028

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

1029

* corresponds to an acceptable network device.

1030

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

1031

*/

1032

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

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

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

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

1042

return 0;

1043

}

1044

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

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

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

1050

/* read line from flags_fd */

1051

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

1052

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1053

flagstring[(size_t)to_read] = '\0';

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

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

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1070

break;

1071

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

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

1078

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

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1122

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

1123

int ret;

1124

1125

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

1126

if(s < 0){

1127

perror_plus("socket");

1128

return false;

1129

}

1130

strcpy(ifr->ifr_name, ifname);

1131

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1132

if(ret == -1){

1081

1133

if(debug){

1082

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1083

flagstring, if_entry->d_name);

1134

perror_plus("ioctl SIOCGIFFLAGS");

1084

1135

}

1085

free(flagstring);

1086

return 0;

1136

return false;

1087

1137

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1138

return true;

1139

}

1140

1141

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

1142

1090

1143

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1144

if(ifr->ifr_flags & IFF_LOOPBACK){

1092

1145

if(debug){

1093

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

1094

if_entry->d_name);

1146

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

1147

ifname);

1095

1148

}

1096

return 0;

1149

return false;

1097

1150

}

1098

1151

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

1099

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

1152

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

1100

1153

if(debug){

1101

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1102

if_entry->d_name);

1154

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

1155

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

1103

1156

}

1104

return 1;

1157

return true;

1105

1158

}

1106

1159

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

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1160

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

1161

if(debug){

1162

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1163

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

1164

}

1165

return false;

1166

}

1167

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

1168

if(ifr->ifr_flags & IFF_NOARP){

1169

if(debug){

1170

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

1171

ifname);

1172

}

1173

return false;

1174

}

1175

1114

1176

/* Accept this device */

1115

1177

if(debug){

1116

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1117

if_entry->d_name);

1118

}

1119

return 1;

1178

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

1179

}

1180

return true;

1181

}

1182

1183

/*

1184

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

1185

* corresponds to an acceptable network device.

1186

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

1187

*/

1188

int good_interface(const struct dirent *if_entry){

1189

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

1190

return 0;

1191

}

1192

1193

struct ifreq ifr;

1194

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

1195

if(debug){

1196

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

1197

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

1198

}

1199

return 0;

1200

}

1201

1202

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

1203

return 0;

1204

}

1205

return 1;

1206

}

1207

1208

/*

1209

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

1210

* corresponds to an acceptable network device which is up.

1211

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

1212

*/

1213

int up_interface(const struct dirent *if_entry){

1214

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

1215

return 0;

1216

}

1217

1218

struct ifreq ifr;

1219

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

1220

if(debug){

1221

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

1222

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

1223

}

1224

return 0;

1225

}

1226

1227

/* Reject down interfaces */

1228

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

1229

if(debug){

1230

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

1231

if_entry->d_name);

1232

}

1233

return 0;

1234

}

1235

1236

/* Reject non-running interfaces */

1237

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

1238

if(debug){

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

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

1246

return 0;

1247

}

1248

return 1;

1249

}

1250

1251

int notdotentries(const struct dirent *direntry){

1252

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

1253

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

1254

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

1255

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

1256

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

1257

return 0;

1258

}

1259

return 1;

1260

}

1261

1262

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

1263

int runnable_hook(const struct dirent *direntry){

1264

int ret;

1265

size_t sret;

1266

struct stat st;

1267

1268

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

1269

/* Empty name? */

1270

return 0;

1271

}

1272

1273

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

1274

"abcdefghijklmnopqrstuvwxyz"

1275

"0123456789"

1276

"_-");

1277

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

1278

/* Contains non-allowed characters */

1279

if(debug){

1280

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

1281

direntry->d_name);

1282

}

1283

return 0;

1284

}

1285

1286

char *fullname = NULL;

1287

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

1288

if(ret < 0){

1289

perror_plus("asprintf");

1290

return 0;

1291

}

1292

1293

ret = stat(fullname, &st);

1294

if(ret == -1){

1295

if(debug){

1296

perror_plus("Could not stat hook");

1297

}

1298

return 0;

1299

}

1300

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

1301

/* Not a regular file */

1302

if(debug){

1303

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

1304

direntry->d_name);

1305

}

1306

return 0;

1307

}

1308

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

1309

/* Not executable */

1310

if(debug){

1311

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

1312

direntry->d_name);

1313

}

1314

return 0;

1315

}

1316

if(debug){

1317

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

1318

direntry->d_name);

1319

}

1320

return 1;

1321

}

1322

1323

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1324

int ret;

1325

struct timespec now;

1326

struct timespec waited_time;

1327

intmax_t block_time;

1328

1329

while(true){

1330

if(mc.current_server == NULL){

1331

if (debug){

1332

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

1333

" No timeout!\n");

1334

}

1335

ret = avahi_simple_poll_iterate(s, -1);

1336

} else {

1337

if (debug){

1338

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

1339

" it, or wait\n");

1340

}

1341

/* the current time */

1342

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1343

if(ret == -1){

1344

perror_plus("clock_gettime");

1345

return -1;

1346

}

1347

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

1348

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

1349

waited_time.tv_sec = (now.tv_sec

1350

- mc.current_server->last_seen.tv_sec);

1351

waited_time.tv_nsec = (now.tv_nsec

1352

- mc.current_server->last_seen.tv_nsec);

1353

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

1354

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

1355

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

1356

block_time = ((retry_interval

1357

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

1358

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

1359

1360

if (debug){

1361

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

1362

block_time);

1363

}

1364

1365

if(block_time <= 0){

1366

ret = start_mandos_communication(mc.current_server->ip,

1367

mc.current_server->port,

1368

mc.current_server->if_index,

1369

mc.current_server->af);

1370

if(ret == 0){

1371

avahi_simple_poll_quit(mc.simple_poll);

1372

return 0;

1373

}

1374

ret = clock_gettime(CLOCK_MONOTONIC,

1375

&mc.current_server->last_seen);

1376

if(ret == -1){

1377

perror_plus("clock_gettime");

1378

return -1;

1379

}

1380

mc.current_server = mc.current_server->next;

1381

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

1382

servers, but don't block */

1383

}

1384

1385

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

1386

}

1387

if(ret != 0){

1388

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

1389

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

1390

}

1391

}

1392

}

1393

}

1394

1395

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

1396

error_t raise_privileges(void){

1397

error_t old_errno = errno;

1398

error_t ret_errno = 0;

1399

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

1400

ret_errno = errno;

1401

perror_plus("seteuid");

1402

}

1403

errno = old_errno;

1404

return ret_errno;

1405

}

1406

1407

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

1408

error_t raise_privileges_permanently(void){

1409

error_t old_errno = errno;

1410

error_t ret_errno = raise_privileges();

1411

if(ret_errno != 0){

1412

errno = old_errno;

1413

return ret_errno;

1414

}

1415

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

1416

ret_errno = errno;

1417

perror_plus("seteuid");

1418

}

1419

errno = old_errno;

1420

return ret_errno;

1421

}

1422

1423

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

1424

error_t lower_privileges(void){

1425

error_t old_errno = errno;

1426

error_t ret_errno = 0;

1427

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

1428

ret_errno = errno;

1429

perror_plus("seteuid");

1430

}

1431

errno = old_errno;

1432

return ret_errno;

1433

}

1434

1435

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

1436

const float delay){

1437

struct dirent **direntries;

1438

struct dirent *direntry;

1439

int ret;

1440

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

1441

alphasort);

1442

if(numhooks == -1){

1443

perror_plus("scandir");

1444

} else {

1445

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

1446

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

1447

direntry = direntries[i];

1448

char *fullname = NULL;

1449

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

1450

if(ret < 0){

1451

perror_plus("asprintf");

1452

continue;

1453

}

1454

if(debug){

1455

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

1456

direntry->d_name);

1457

}

1458

pid_t hook_pid = fork();

1459

if(hook_pid == 0){

1460

/* Child */

1461

/* Raise privileges */

1462

raise_privileges_permanently();

1463

/* Set group */

1464

errno = 0;

1465

ret = setgid(0);

1466

if(ret == -1){

1467

perror_plus("setgid");

1468

}

1469

/* Reset supplementary groups */

1470

errno = 0;

1471

ret = setgroups(0, NULL);

1472

if(ret == -1){

1473

perror_plus("setgroups");

1474

}

1475

dup2(devnull, STDIN_FILENO);

1476

close(devnull);

1477

dup2(STDERR_FILENO, STDOUT_FILENO);

1478

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

1479

if(ret == -1){

1480

perror_plus("setenv");

1481

_exit(EX_OSERR);

1482

}

1483

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

1484

if(ret == -1){

1485

perror_plus("setenv");

1486

_exit(EX_OSERR);

1487

}

1488

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

1489

if(ret == -1){

1490

perror_plus("setenv");

1491

_exit(EX_OSERR);

1492

}

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

char *delaystring;

1499

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

1500

if(ret == -1){

1501

perror_plus("asprintf");

1502

_exit(EX_OSERR);

1503

}

1504

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

1505

if(ret == -1){

1506

free(delaystring);

1507

perror_plus("setenv");

1508

_exit(EX_OSERR);

1509

}

1510

free(delaystring);

1511

if(connect_to != NULL){

1512

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

1513

if(ret == -1){

1514

perror_plus("setenv");

1515

_exit(EX_OSERR);

1516

}

1517

}

1518

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

1519

perror_plus("execl");

1520

_exit(EXIT_FAILURE);

1521

}

1522

} else {

1523

int status;

1524

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

1525

perror_plus("waitpid");

1526

free(fullname);

1527

continue;

1528

}

1529

if(WIFEXITED(status)){

1530

if(WEXITSTATUS(status) != 0){

1531

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

1532

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

1533

WEXITSTATUS(status));

1534

free(fullname);

1535

continue;

1536

}

1537

} else if(WIFSIGNALED(status)){

1538

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

1539

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

1540

WTERMSIG(status));

1541

free(fullname);

1542

continue;

1543

} else {

1544

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

1545

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

1546

free(fullname);

1547

continue;

1548

}

1549

}

1550

free(fullname);

1551

if(debug){

1552

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

1553

direntry->d_name);

1554

}

1555

}

1556

close(devnull);

1557

}

1558

return true;

1559

}

1560

1561

int bring_up_interface(const char *const interface,

1562

const float delay){

1563

int sd = -1;

1564

int old_errno = errno;

1565

int ret_errno = 0;

1566

int ret;

1567

struct ifreq network;

1568

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1569

if(if_index == 0){

1570

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

1571

errno = old_errno;

1572

return ENXIO;

1573

}

1574

1575

if(quit_now){

1576

errno = old_errno;

1577

return EINTR;

1578

}

1579

1580

/* Re-raise priviliges */

1581

raise_privileges();

1582

1583

#ifdef __linux__

1584

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1585

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

1586

ret = klogctl(8, NULL, 5);

1587

bool restore_loglevel = true;

1588

if(ret == -1){

1589

restore_loglevel = false;

1590

perror_plus("klogctl");

1591

}

1592

#endif /* __linux__ */

1593

1594

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1595

if(sd < 0){

1596

ret_errno = errno;

1597

perror_plus("socket");

1598

#ifdef __linux__

1599

if(restore_loglevel){

1600

ret = klogctl(7, NULL, 0);

1601

if(ret == -1){

1602

perror_plus("klogctl");

1603

}

1604

}

1605

#endif /* __linux__ */

1606

/* Lower privileges */

1607

lower_privileges();

1608

errno = old_errno;

1609

return ret_errno;

1610

}

1611

strcpy(network.ifr_name, interface);

1612

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

1613

if(ret == -1){

1614

ret_errno = errno;

1615

perror_plus("ioctl SIOCGIFFLAGS");

1616

#ifdef __linux__

1617

if(restore_loglevel){

1618

ret = klogctl(7, NULL, 0);

1619

if(ret == -1){

1620

perror_plus("klogctl");

1621

}

1622

}

1623

#endif /* __linux__ */

1624

/* Lower privileges */

1625

lower_privileges();

1626

errno = old_errno;

1627

return ret_errno;

1628

}

1629

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

1630

network.ifr_flags |= IFF_UP;

1631

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

1632

if(ret == -1){

1633

ret_errno = errno;

1634

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1635

#ifdef __linux__

1636

if(restore_loglevel){

1637

ret = klogctl(7, NULL, 0);

1638

if(ret == -1){

1639

perror_plus("klogctl");

1640

}

1641

}

1642

#endif /* __linux__ */

1643

/* Lower privileges */

1644

lower_privileges();

1645

errno = old_errno;

1646

return ret_errno;

1647

}

1648

}

1649

/* Sleep checking until interface is running.

1650

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

1651

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

1652

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

1653

if(ret == -1){

1654

perror_plus("ioctl SIOCGIFFLAGS");

1655

} else if(network.ifr_flags & IFF_RUNNING){

1656

break;

1657

}

1658

struct timespec sleeptime = { .tv_nsec = 250000000 };

1659

ret = nanosleep(&sleeptime, NULL);

1660

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

1661

perror_plus("nanosleep");

1662

}

1663

}

1664

/* Close the socket */

1665

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

1666

if(ret == -1){

1667

perror_plus("close");

1668

}

1669

#ifdef __linux__

1670

if(restore_loglevel){

1671

/* Restores kernel loglevel to default */

1672

ret = klogctl(7, NULL, 0);

1673

if(ret == -1){

1674

perror_plus("klogctl");

1675

}

1676

}

1677

#endif /* __linux__ */

1678

/* Lower privileges */

1679

lower_privileges();

1680

errno = old_errno;

1681

return 0;

1120

1682

}

1121

1683

1122

1684

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

1130

1692

struct ifreq network;

1131

1693

int sd = -1;

1132

1694

bool take_down_interface = false;

1133

uid_t uid;

1134

gid_t gid;

1135

1695

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

1136

1696

bool tempdir_created = false;

1137

1697

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1141

1701

bool gnutls_initialized = false;

1142

1702

bool gpgme_initialized = false;

1143

1703

float delay = 2.5f;

1704

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

1705

retrying the same server again */

1144

1706

1145

1707

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

1708

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1152

1714

errno = 0;

1153

1715

ret = setgid(gid);

1154

1716

if(ret == -1){

1155

perror("setgid");

1717

perror_plus("setgid");

1156

1718

}

1157

1719

1158

1720

/* Lower user privileges (temporarily) */

1159

1721

errno = 0;

1160

1722

ret = seteuid(uid);

1161

1723

if(ret == -1){

1162

perror("seteuid");

1724

perror_plus("seteuid");

1163

1725

}

1164

1726

1165

1727

if(quit_now){

1200

1762

.arg = "SECONDS",

1201

1763

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

1202

1764

.group = 2 },

1765

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

1766

.arg = "SECONDS",

1767

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

1768

.group = 2 },

1769

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

1770

.arg = "DIR",

1771

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

1772

.group = 2 },

1203

1773

/*

1204

1774

* These reproduce what we would get without ARGP_NO_HELP

1205

1775

*/

1249

1819

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

1250

1820

argp_error(state, "Bad delay");

1251

1821

}

1822

case 132: /* --retry */

1823

errno = 0;

1824

retry_interval = strtod(arg, &tmp);

1825

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

1826

or (retry_interval * 1000) > INT_MAX

1827

or retry_interval < 0){

1828

argp_error(state, "Bad retry interval");

1829

}

1830

break;

1831

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

1832

hookdir = arg;

1252

1833

break;

1253

1834

/*

1254

1835

* These reproduce what we would get without ARGP_NO_HELP

1261

1842

argp_state_help(state, state->out_stream,

1262

1843

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

1844

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

1264

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

1845

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

1265

1846

exit(argp_err_exit_status);

1266

1847

break;

1267

1848

default:

1282

1863

case ENOMEM:

1283

1864

default:

1284

1865

errno = ret;

1285

perror("argp_parse");

1866

perror_plus("argp_parse");

1286

1867

exitcode = EX_OSERR;

1287

1868

goto end;

1288

1869

case EINVAL:

1290

1871

goto end;

1291

1872

}

1292

1873

}

1874

1875

{

1876

/* Work around Debian bug #633582:

1877

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

1878

1879

/* Re-raise priviliges */

1880

if(raise_privileges() == 0){

1881

struct stat st;

1882

1883

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

1884

int seckey_fd = open(seckey, O_RDONLY);

1885

if(seckey_fd == -1){

1886

perror_plus("open");

1887

} else {

1888

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

1889

if(ret == -1){

1890

perror_plus("fstat");

1891

} else {

1892

if(S_ISREG(st.st_mode)

1893

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

1894

ret = fchown(seckey_fd, uid, gid);

1895

if(ret == -1){

1896

perror_plus("fchown");

1897

}

1898

}

1899

}

1900

TEMP_FAILURE_RETRY(close(seckey_fd));

1901

}

1902

}

1903

1904

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

1905

int pubkey_fd = open(pubkey, O_RDONLY);

1906

if(pubkey_fd == -1){

1907

perror_plus("open");

1908

} else {

1909

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

1910

if(ret == -1){

1911

perror_plus("fstat");

1912

} else {

1913

if(S_ISREG(st.st_mode)

1914

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

1915

ret = fchown(pubkey_fd, uid, gid);

1916

if(ret == -1){

1917

perror_plus("fchown");

1918

}

1919

}

1920

}

1921

TEMP_FAILURE_RETRY(close(pubkey_fd));

1922

}

1923

}

1924

1925

/* Lower privileges */

1926

errno = 0;

1927

ret = seteuid(uid);

1928

if(ret == -1){

1929

perror_plus("seteuid");

1930

}

1931

}

1932

}

1933

1934

/* Run network hooks */

1935

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

1936

goto end;

1937

}

1293

1938

1294

1939

if(not debug){

1295

1940

avahi_set_log_function(empty_log);

1296

1941

}

1297

1942

1298

1943

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

1299

1944

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1945

/* First look for interfaces that are up */

1946

ret = scandir(sys_class_net, &direntries, up_interface,

1301

1947

alphasort);

1948

if(ret == 0){

1949

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

1950

free(direntries);

1951

ret = scandir(sys_class_net, &direntries, good_interface,

1952

alphasort);

1953

}

1302

1954

if(ret >= 1){

1303

/* Pick the first good interface */

1955

/* Pick the first interface returned */

1304

1956

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

1305

1957

if(debug){

1306

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

1958

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

1307

1959

}

1308

1960

if(interface == NULL){

1309

perror("malloc");

1961

perror_plus("malloc");

1310

1962

free(direntries);

1311

1963

exitcode = EXIT_FAILURE;

1312

1964

goto end;

1314

1966

free(direntries);

1315

1967

} else {

1316

1968

free(direntries);

1317

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

1969

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

1318

1970

exitcode = EXIT_FAILURE;

1319

1971

goto end;

1320

1972

}

1326

1978

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

1327

1979

mc.simple_poll = avahi_simple_poll_new();

1328

1980

if(mc.simple_poll == NULL){

1329

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

1981

fprintf_plus(stderr,

1982

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

1330

1983

exitcode = EX_UNAVAILABLE;

1331

1984

goto end;

1332

1985

}

1334

1987

sigemptyset(&sigterm_action.sa_mask);

1335

1988

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

1336

1989

if(ret == -1){

1337

perror("sigaddset");

1990

perror_plus("sigaddset");

1338

1991

exitcode = EX_OSERR;

1339

1992

goto end;

1340

1993

}

1341

1994

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

1342

1995

if(ret == -1){

1343

perror("sigaddset");

1996

perror_plus("sigaddset");

1344

1997

exitcode = EX_OSERR;

1345

1998

goto end;

1346

1999

}

1347

2000

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

1348

2001

if(ret == -1){

1349

perror("sigaddset");

2002

perror_plus("sigaddset");

1350

2003

exitcode = EX_OSERR;

1351

2004

goto end;

1352

2005

}

1356

2009

*/

1357

2010

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

1358

2011

if(ret == -1){

1359

perror("sigaction");

2012

perror_plus("sigaction");

1360

2013

return EX_OSERR;

1361

2014

}

1362

2015

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

2016

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

1364

2017

if(ret == -1){

1365

perror("sigaction");

2018

perror_plus("sigaction");

1366

2019

exitcode = EX_OSERR;

1367

2020

goto end;

1368

2021

}

1369

2022

}

1370

2023

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

1371

2024

if(ret == -1){

1372

perror("sigaction");

2025

perror_plus("sigaction");

1373

2026

return EX_OSERR;

1374

2027

}

1375

2028

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

2029

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

1377

2030

if(ret == -1){

1378

perror("sigaction");

2031

perror_plus("sigaction");

1379

2032

exitcode = EX_OSERR;

1380

2033

goto end;

1381

2034

}

1382

2035

}

1383

2036

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

1384

2037

if(ret == -1){

1385

perror("sigaction");

2038

perror_plus("sigaction");

1386

2039

return EX_OSERR;

1387

2040

}

1388

2041

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

2042

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

1390

2043

if(ret == -1){

1391

perror("sigaction");

2044

perror_plus("sigaction");

1392

2045

exitcode = EX_OSERR;

1393

2046

goto end;

1394

2047

}

1395

2048

}

1396

2049

1397

2050

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

1398

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

1399

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

if(if_index == 0){

1401

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

1402

exitcode = EX_UNAVAILABLE;

1403

goto end;

1404

}

1405

1406

if(quit_now){

1407

goto end;

1408

}

1409

1410

/* Re-raise priviliges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror("seteuid");

1415

}

1416

1417

#ifdef __linux__

1418

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1419

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

1420

ret = klogctl(8, NULL, 5);

1421

bool restore_loglevel = true;

1422

if(ret == -1){

1423

restore_loglevel = false;

1424

perror("klogctl");

1425

}

1426

#endif /* __linux__ */

1427

1428

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

if(sd < 0){

1430

perror("socket");

1431

exitcode = EX_OSERR;

1432

#ifdef __linux__

1433

if(restore_loglevel){

1434

ret = klogctl(7, NULL, 0);

1435

if(ret == -1){

1436

perror("klogctl");

1437

}

1438

}

1439

#endif /* __linux__ */

1440

/* Lower privileges */

1441

errno = 0;

1442

ret = seteuid(uid);

1443

if(ret == -1){

1444

perror("seteuid");

1445

}

1446

goto end;

1447

}

1448

strcpy(network.ifr_name, interface);

1449

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

1450

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1452

#ifdef __linux__

1453

if(restore_loglevel){

1454

ret = klogctl(7, NULL, 0);

1455

if(ret == -1){

1456

perror("klogctl");

1457

}

1458

}

1459

#endif /* __linux__ */

1460

exitcode = EX_OSERR;

1461

/* Lower privileges */

1462

errno = 0;

1463

ret = seteuid(uid);

1464

if(ret == -1){

1465

perror("seteuid");

1466

}

1467

goto end;

1468

}

1469

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

1470

network.ifr_flags |= IFF_UP;

1471

take_down_interface = true;

1472

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

1473

if(ret == -1){

1474

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1476

exitcode = EX_OSERR;

1477

#ifdef __linux__

1478

if(restore_loglevel){

1479

ret = klogctl(7, NULL, 0);

1480

if(ret == -1){

1481

perror("klogctl");

1482

}

1483

}

1484

#endif /* __linux__ */

1485

/* Lower privileges */

1486

errno = 0;

1487

ret = seteuid(uid);

1488

if(ret == -1){

1489

perror("seteuid");

1490

}

1491

goto end;

1492

}

1493

}

1494

/* sleep checking until interface is running */

1495

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

1496

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

1497

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

1499

} else if(network.ifr_flags & IFF_RUNNING){

1500

break;

1501

}

1502

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

ret = nanosleep(&sleeptime, NULL);

1504

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

1505

perror("nanosleep");

1506

}

1507

}

1508

if(not take_down_interface){

1509

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

1510

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

1511

if(ret == -1){

1512

perror("close");

1513

}

1514

}

1515

#ifdef __linux__

1516

if(restore_loglevel){

1517

/* Restores kernel loglevel to default */

1518

ret = klogctl(7, NULL, 0);

1519

if(ret == -1){

1520

perror("klogctl");

1521

}

1522

}

1523

#endif /* __linux__ */

1524

/* Lower privileges */

1525

errno = 0;

1526

if(take_down_interface){

1527

/* Lower privileges */

1528

ret = seteuid(uid);

1529

if(ret == -1){

1530

perror("seteuid");

1531

}

1532

} else {

1533

/* Lower privileges permanently */

1534

ret = setuid(uid);

1535

if(ret == -1){

1536

perror("setuid");

1537

}

2051

if((interface[0] != '\0') and (strcmp(interface, "none") != 0)){

2052

ret = bring_up_interface(interface, delay);

2053

if(ret != 0){

2054

errno = ret;

2055

perror_plus("Failed to bring up interface");

1538

2056

}

1539

2057

}

1540

2058

1544

2062

1545

2063

ret = init_gnutls_global(pubkey, seckey);

1546

2064

if(ret == -1){

1547

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

2065

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

1548

2066

exitcode = EX_UNAVAILABLE;

1549

2067

goto end;

1550

2068

} else {

1555

2073

goto end;

1556

2074

}

1557

2075

2076

if(mkdtemp(tempdir) == NULL){

2077

perror_plus("mkdtemp");

2078

goto end;

2079

}

1558

2080

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

1562

goto end;

1563

}

1564

2081

1565

2082

if(quit_now){

1566

2083

goto end;

1567

2084

}

1568

2085

1569

2086

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

1570

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

2087

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

1571

2088

exitcode = EX_UNAVAILABLE;

1572

2089

goto end;

1573

2090

} else {

1582

2099

/* Connect directly, do not use Zeroconf */

1583

2100

/* (Mainly meant for debugging) */

1584

2101

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

2102

1585

2103

if(address == NULL){

1586

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

2104

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

1587

2105

exitcode = EX_USAGE;

1588

2106

goto end;

1589

2107

}

1597

2115

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

1598

2116

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

1599

2117

or tmpmax != (uint16_t)tmpmax){

1600

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

2118

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

1601

2119

exitcode = EX_USAGE;

1602

2120

goto end;

1603

2121

}

1608

2126

1609

2127

port = (uint16_t)tmpmax;

1610

2128

*address = '\0';

1611

address = connect_to;

1612

2129

/* Colon in address indicates IPv6 */

1613

2130

int af;

1614

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

2131

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

1615

2132

af = AF_INET6;

2133

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

2134

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

2135

{

2136

connect_to++;

2137

address[-1] = '\0';

2138

}

1616

2139

} else {

1617

2140

af = AF_INET;

1618

2141

}

2142

address = connect_to;

1619

2143

1620

2144

if(quit_now){

1621

2145

goto end;

1622

2146

}

1623

2147

1624

2148

while(not quit_now){

1625

2149

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

1626

2150

if(quit_now or ret == 0){

1627

2151

break;

1628

2152

}

1629

sleep(15);

1630

};

1631

2153

if(debug){

2154

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

2155

(int)retry_interval);

2156

}

2157

sleep((int)retry_interval);

2158

}

2159

1632

2160

if (not quit_now){

1633

2161

exitcode = EXIT_SUCCESS;

1634

2162

}

1635

2163

1636

2164

goto end;

1637

2165

}

1638

2166

1660

2188

1661

2189

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

1662

2190

if(mc.server == NULL){

1663

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

1664

avahi_strerror(error));

2191

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

2192

avahi_strerror(error));

1665

2193

exitcode = EX_UNAVAILABLE;

1666

2194

goto end;

1667

2195

}

1675

2203

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1676

2204

NULL, 0, browse_callback, NULL);

1677

2205

if(sb == NULL){

1678

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

1679

avahi_strerror(avahi_server_errno(mc.server)));

2206

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

2207

avahi_strerror(avahi_server_errno(mc.server)));

1680

2208

exitcode = EX_UNAVAILABLE;

1681

2209

goto end;

1682

2210

}

1688

2216

/* Run the main loop */

1689

2217

1690

2218

if(debug){

1691

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

1692

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2219

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

2220

}

2221

2222

ret = avahi_loop_with_timeout(mc.simple_poll,

2223

(int)(retry_interval * 1000));

2224

if(debug){

2225

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

2226

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

2227

}

1695

2228

1696

2229

end:

1697

2230

1698

2231

if(debug){

1699

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

2232

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

1700

2233

}

1701

2234

1702

2235

/* Cleanup things */

1719

2252

gpgme_release(mc.ctx);

1720

2253

}

1721

2254

1722

/* Take down the network interface */

1723

if(take_down_interface){

1724

/* Re-raise priviliges */

1725

errno = 0;

1726

ret = seteuid(0);

1727

if(ret == -1){

1728

perror("seteuid");

2255

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

2256

has seen */

2257

if(mc.current_server != NULL){

2258

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

2259

while(mc.current_server != NULL){

2260

server *next = mc.current_server->next;

2261

free(mc.current_server);

2262

mc.current_server = next;

1729

2263

}

1730

if(geteuid() == 0){

2264

}

2265

2266

/* Run network hooks */

2267

run_network_hooks("stop", interface, delay);

2268

2269

/* Re-raise priviliges */

2270

{

2271

raise_privileges();

2272

2273

/* Take down the network interface */

2274

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

1731

2275

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

1732

2276

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

2277

perror_plus("ioctl SIOCGIFFLAGS");

2278

} else if(network.ifr_flags & IFF_UP){

1735

2279

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

1736

2280

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

1737

2281

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2282

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1739

2283

}

1740

2284

}

1741

2285

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

1742

2286

if(ret == -1){

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

2287

perror_plus("close");

1750

2288

}

1751

2289

}

1752

2290

}

2291

/* Lower privileges permanently */

2292

errno = 0;

2293

ret = setuid(uid);

2294

if(ret == -1){

2295

perror_plus("setuid");

2296

}

1753

2297

1754

/* Removes the temp directory used by GPGME */

2298

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

1755

2299

if(tempdir_created){

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

1763

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

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

1770

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

1771

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

1772

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

1773

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

1774

continue;

1775

}

2300

struct dirent **direntries = NULL;

2301

struct dirent *direntry = NULL;

2302

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

2303

alphasort);

2304

if (numentries > 0){

2305

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

2306

direntry = direntries[i];

1776

2307

char *fullname = NULL;

1777

2308

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

1778

2309

direntry->d_name);

1779

2310

if(ret < 0){

1780

perror("asprintf");

2311

perror_plus("asprintf");

1781

2312

continue;

1782

2313

}

1783

2314

ret = remove(fullname);

1784

2315

if(ret == -1){

1785

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

1786

strerror(errno));

2316

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

2317

strerror(errno));

1787

2318

}

1788

2319

free(fullname);

1789

2320

}

1790

closedir(d);

2321

}

2322

2323

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

2324

free(direntries);

2325

if (numentries == -1){

2326

perror_plus("scandir");

1791

2327

}

1792

2328

ret = rmdir(tempdir);

1793

2329

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

1794

perror("rmdir");

2330

perror_plus("rmdir");

1795

2331

}

1796

2332

}

1797

2333

1802

2338

&old_sigterm_action,

1803

2339

NULL));

1804

2340

if(ret == -1){

1805

perror("sigaction");

2341

perror_plus("sigaction");

1806

2342

}

1807

2343

do {

1808

2344

ret = raise(signal_received);

1809

2345

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

1810

2346

if(ret != 0){

1811

perror("raise");

2347

perror_plus("raise");

1812

2348

abort();

1813

2349

}

1814

2350

TEMP_FAILURE_RETRY(pause());