/mandos/release : revision 237.7.35

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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@recompile.se>.

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

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*/

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/* 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, intptr_t */

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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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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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*/

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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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*/

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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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setgid(), pause() */

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

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

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#ifdef __linux__

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90

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

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108

init_gnutls_session(),

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109

GNUTLS_* */

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110

#include <gnutls/openpgp.h>

117

/* 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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113

120

114

/* GPGME */

121

115

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

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

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124

#define SECKEY "seckey.txt"

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125

#define PUBKEY "pubkey.txt"

132

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

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126

134

127

bool debug = false;

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128

static const char mandos_protocol_version[] = "1";

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129

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

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131

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

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132

char *connect_to = NULL;

140

const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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133

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134

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

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135

typedef struct server{

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136

const char *ip;

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in_port_t port;

137

uint16_t port;

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138

AvahiIfIndex if_index;

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139

int af;

150

140

struct timespec last_seen;

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165

176

166

/* Function to use when printing errors */

177

167

void perror_plus(const char *print_text){

178

int e = errno;

179

168

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

180

169

program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

186

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

187

va_list ap;

188

va_start (ap, format);

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190

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

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program_invocation_short_name));

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

193

}

194

195

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/*

196

174

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

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

198

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* "buffer_length" is how much is already used.

199

177

*/

200

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

202

180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

203

181

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

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182

if(buffer == NULL){

209

187

return buffer_capacity;

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188

}

211

189

212

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

213

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

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int af){

190

int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

192

int af){

215

193

int ret;

216

194

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

217

195

if(new_server == NULL){

218

196

perror_plus("malloc");

219

return false;

197

return -1;

220

198

}

221

199

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

222

.port = port,

223

.if_index = if_index,

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.af = af };

200

.port = port,

201

.if_index = if_index,

202

.af = af };

225

203

if(new_server->ip == NULL){

226

204

perror_plus("strdup");

227

return false;

205

return -1;

228

206

}

229

/* Special case of first server */

207

/* unique case of first server */

230

208

if (mc.current_server == NULL){

231

209

new_server->next = new_server;

232

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new_server->prev = new_server;

233

211

mc.current_server = new_server;

234

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

212

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

235

213

} else {

236

214

new_server->next = mc.current_server;

237

215

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

241

219

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

242

220

if(ret == -1){

243

221

perror_plus("clock_gettime");

244

return false;

222

return -1;

245

223

}

246

return true;

224

return 0;

247

225

}

248

226

249

227

/*

250

228

* Initialize GPGME.

251

229

*/

252

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

253

const char *tempdir){

230

static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

254

232

gpgme_error_t rc;

255

233

gpgme_engine_info_t engine_info;

256

234

271

249

272

250

rc = gpgme_data_new_from_fd(&pgp_data, fd);

273

251

if(rc != GPG_ERR_NO_ERROR){

274

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

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gpgme_strsource(rc), gpgme_strerror(rc));

252

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

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gpgme_strsource(rc), gpgme_strerror(rc));

276

254

return false;

277

255

}

278

256

279

257

rc = gpgme_op_import(mc.ctx, pgp_data);

280

258

if(rc != GPG_ERR_NO_ERROR){

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

259

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

260

gpgme_strsource(rc), gpgme_strerror(rc));

283

261

return false;

284

262

}

285

263

292

270

}

293

271

294

272

if(debug){

295

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

273

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

296

274

}

297

275

298

276

/* Init GPGME */

299

277

gpgme_check_version(NULL);

300

278

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

301

279

if(rc != GPG_ERR_NO_ERROR){

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

280

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

281

gpgme_strsource(rc), gpgme_strerror(rc));

304

282

return false;

305

283

}

306

284

307

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

285

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

308

286

rc = gpgme_get_engine_info(&engine_info);

309

287

if(rc != GPG_ERR_NO_ERROR){

310

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

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gpgme_strsource(rc), gpgme_strerror(rc));

288

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

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gpgme_strsource(rc), gpgme_strerror(rc));

312

290

return false;

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291

}

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while(engine_info != NULL){

320

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engine_info = engine_info->next;

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}

322

300

if(engine_info == NULL){

323

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

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tempdir);

301

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

325

302

return false;

326

303

}

327

304

328

305

/* Create new GPGME "context" */

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

330

307

if(rc != GPG_ERR_NO_ERROR){

331

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

332

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

333

gpgme_strerror(rc));

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

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310

return false;

335

311

}

336

312

355

331

ssize_t plaintext_length = 0;

356

332

357

333

if(debug){

358

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

334

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

359

335

}

360

336

361

337

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

362

338

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

363

339

0);

364

340

if(rc != GPG_ERR_NO_ERROR){

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

341

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

342

gpgme_strsource(rc), gpgme_strerror(rc));

367

343

return -1;

368

344

}

369

345

370

346

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

371

347

rc = gpgme_data_new(&dh_plain);

372

348

if(rc != GPG_ERR_NO_ERROR){

373

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

374

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

375

gpgme_strsource(rc), gpgme_strerror(rc));

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

376

351

gpgme_data_release(dh_crypto);

377

352

return -1;

378

353

}

381

356

data buffer */

382

357

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

383

358

if(rc != GPG_ERR_NO_ERROR){

384

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

385

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

386

361

plaintext_length = -1;

387

362

if(debug){

388

363

gpgme_decrypt_result_t result;

389

364

result = gpgme_op_decrypt_result(mc.ctx);

390

365

if(result == NULL){

391

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

366

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

392

367

} else {

393

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

394

result->unsupported_algorithm);

395

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

396

result->wrong_key_usage);

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

397

372

if(result->file_name != NULL){

398

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

373

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

399

374

}

400

375

gpgme_recipient_t recipient;

401

376

recipient = result->recipients;

402

377

while(recipient != NULL){

403

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

404

gpgme_pubkey_algo_name

405

(recipient->pubkey_algo));

406

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

407

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

408

recipient->status == GPG_ERR_NO_SECKEY

409

? "No" : "Yes");

378

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

379

gpgme_pubkey_algo_name(recipient->pubkey_algo));

380

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

381

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

382

recipient->status == GPG_ERR_NO_SECKEY

383

? "No" : "Yes");

410

384

recipient = recipient->next;

411

385

}

412

386

}

415

389

}

416

390

417

391

if(debug){

418

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

392

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

419

393

}

420

394

421

395

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

428

402

*plaintext = NULL;

429

403

while(true){

430

404

plaintext_capacity = incbuffer(plaintext,

431

(size_t)plaintext_length,

432

plaintext_capacity);

405

(size_t)plaintext_length,

406

plaintext_capacity);

433

407

if(plaintext_capacity == 0){

434

perror_plus("incbuffer");

435

plaintext_length = -1;

436

goto decrypt_end;

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

437

411

}

438

412

439

413

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

452

426

}

453

427

454

428

if(debug){

455

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

429

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

456

430

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

457

431

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

458

432

}

470

444

}

471

445

472

446

static const char * safer_gnutls_strerror(int value){

473

const char *ret = gnutls_strerror(value);

447

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

448

-Wunreachable-code */

474

449

if(ret == NULL)

475

450

ret = "(unknown)";

476

451

return ret;

479

454

/* GnuTLS log function callback */

480

455

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

481

456

const char* string){

482

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

457

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

483

458

}

484

459

485

460

static int init_gnutls_global(const char *pubkeyfilename,

487

462

int ret;

488

463

489

464

if(debug){

490

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

465

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

491

466

}

492

467

493

468

ret = gnutls_global_init();

494

469

if(ret != GNUTLS_E_SUCCESS){

495

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

496

safer_gnutls_strerror(ret));

470

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

471

safer_gnutls_strerror(ret));

497

472

return -1;

498

473

}

499

474

508

483

/* OpenPGP credentials */

509

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

510

485

if(ret != GNUTLS_E_SUCCESS){

511

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

512

safer_gnutls_strerror(ret));

486

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

487

safer_gnutls_strerror(ret));

513

488

gnutls_global_deinit();

514

489

return -1;

515

490

}

516

491

517

492

if(debug){

518

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

519

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

520

pubkeyfilename,

521

seckeyfilename);

493

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

494

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

495

seckeyfilename);

522

496

}

523

497

524

498

ret = gnutls_certificate_set_openpgp_key_file

525

499

(mc.cred, pubkeyfilename, seckeyfilename,

526

500

GNUTLS_OPENPGP_FMT_BASE64);

527

501

if(ret != GNUTLS_E_SUCCESS){

528

fprintf_plus(stderr,

529

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

530

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

531

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

532

safer_gnutls_strerror(ret));

502

fprintf(stderr,

503

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

504

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

505

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

506

safer_gnutls_strerror(ret));

533

507

goto globalfail;

534

508

}

535

509

536

510

/* GnuTLS server initialization */

537

511

ret = gnutls_dh_params_init(&mc.dh_params);

538

512

if(ret != GNUTLS_E_SUCCESS){

539

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

540

" initialization: %s\n",

541

safer_gnutls_strerror(ret));

513

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

514

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

542

515

goto globalfail;

543

516

}

544

517

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

545

518

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

519

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

520

safer_gnutls_strerror(ret));

548

521

goto globalfail;

549

522

}

550

523

570

543

}

571

544

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

572

545

if(ret != GNUTLS_E_SUCCESS){

573

fprintf_plus(stderr,

574

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

575

safer_gnutls_strerror(ret));

546

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

547

safer_gnutls_strerror(ret));

576

548

}

577

549

578

550

{

585

557

}

586

558

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

587

559

if(ret != GNUTLS_E_SUCCESS){

588

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

589

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

590

safer_gnutls_strerror(ret));

560

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

561

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

562

safer_gnutls_strerror(ret));

591

563

gnutls_deinit(*session);

592

564

return -1;

593

565

}

602

574

}

603

575

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

604

576

if(ret != GNUTLS_E_SUCCESS){

605

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

606

safer_gnutls_strerror(ret));

577

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

578

safer_gnutls_strerror(ret));

607

579

gnutls_deinit(*session);

608

580

return -1;

609

581

}

621

593

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

622

594

623

595

/* Called when a Mandos server is found */

624

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

596

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

625

597

AvahiIfIndex if_index,

626

598

int af){

627

599

int ret, tcp_sd = -1;

654

626

pf = PF_INET;

655

627

break;

656

628

default:

657

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

629

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

658

630

errno = EINVAL;

659

631

return -1;

660

632

}

665

637

}

666

638

667

639

if(debug){

668

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

669

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

640

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

641

"\n", ip, port);

670

642

}

671

643

672

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

698

670

}

699

671

if(ret == 0){

700

672

int e = errno;

701

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

673

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

702

674

errno = e;

703

675

goto mandos_end;

704

676

}

705

677

if(af == AF_INET6){

706

to.in6.sin6_port = htons(port);

678

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

679

-Wconversion and

680

-Wunreachable-code */

681

707

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

708

683

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

709

-Wunreachable-code*/

684

-Wunreachable-code*/

710

685

if(if_index == AVAHI_IF_UNSPEC){

711

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

712

" incomplete without a network interface\n");

686

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

687

" without a network interface\n");

713

688

errno = EINVAL;

714

689

goto mandos_end;

715

690

}

733

708

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

734

709

perror_plus("if_indextoname");

735

710

} else {

736

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

737

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

711

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

712

ip, interface, port);

738

713

}

739

714

} else {

740

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

741

ip, (uintmax_t)port);

715

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

716

port);

742

717

}

743

718

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

744

719

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

754

729

perror_plus("inet_ntop");

755

730

} else {

756

731

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

757

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

732

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

758

733

}

759

734

}

760

735

}

788

763

while(true){

789

764

size_t out_size = strlen(out);

790

765

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

791

out_size - written));

766

out_size - written));

792

767

if(ret == -1){

793

768

int e = errno;

794

769

perror_plus("write");

814

789

}

815

790

816

791

if(debug){

817

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

792

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

818

793

}

819

794

820

795

if(quit_now){

822

797

goto mandos_end;

823

798

}

824

799

825

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

826

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

827

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

828

gnutls_transport_set_ptr(session,

829

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

800

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

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

830

802

831

803

if(quit_now){

832

804

errno = EINTR;

843

815

844

816

if(ret != GNUTLS_E_SUCCESS){

845

817

if(debug){

846

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

818

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

847

819

gnutls_perror(ret);

848

820

}

849

821

errno = EPROTO;

853

825

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

854

826

855

827

if(debug){

856

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

857

" %s\n", ip);

828

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

829

ip);

858

830

}

859

831

860

832

while(true){

865

837

}

866

838

867

839

buffer_capacity = incbuffer(&buffer, buffer_length,

868

buffer_capacity);

840

buffer_capacity);

869

841

if(buffer_capacity == 0){

870

842

int e = errno;

871

843

perror_plus("incbuffer");

898

870

}

899

871

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

900

872

if(ret < 0){

901

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

902

"***\n");

873

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

903

874

gnutls_perror(ret);

904

875

errno = EPROTO;

905

876

goto mandos_end;

906

877

}

907

878

break;

908

879

default:

909

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

910

" encrypted session with Mandos server\n");

880

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

881

" encrypted session with Mandos server\n");

911

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

912

883

errno = EIO;

913

884

goto mandos_end;

918

889

}

919

890

920

891

if(debug){

921

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

892

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

922

893

}

923

894

924

895

if(quit_now){

936

907

937

908

if(buffer_length > 0){

938

909

ssize_t decrypted_buffer_size;

939

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

940

912

&decrypted_buffer);

941

913

if(decrypted_buffer_size >= 0){

942

914

953

925

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

954

926

int e = errno;

955

927

if(debug){

956

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

957

strerror(errno));

928

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

929

strerror(errno));

958

930

}

959

931

errno = e;

960

932

goto mandos_end;

1005

977

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

978

flags,

1007

979

AVAHI_GCC_UNUSED void* userdata){

1008

if(r == NULL){

1009

return;

1010

}

980

assert(r);

1011

981

1012

982

/* Called whenever a service has been resolved successfully or

1013

983

timed out */

1019

989

switch(event){

1020

990

default:

1021

991

case AVAHI_RESOLVER_FAILURE:

1022

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

1023

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

1024

domain,

1025

avahi_strerror(avahi_server_errno(mc.server)));

992

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

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1026

995

break;

1027

996

1028

997

case AVAHI_RESOLVER_FOUND:

1030

999

char ip[AVAHI_ADDRESS_STR_MAX];

1031

1000

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

1032

1001

if(debug){

1033

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

1034

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

1035

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

1002

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

1003

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

1004

ip, (intmax_t)interface, port);

1036

1005

}

1037

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

1038

interface,

1006

int ret = start_mandos_communication(ip, port, interface,

1039

1007

avahi_proto_to_af(proto));

1040

1008

if(ret == 0){

1041

1009

avahi_simple_poll_quit(mc.simple_poll);

1042

1010

} else {

1043

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

1044

avahi_proto_to_af(proto))){

1045

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

1046

" list\n", name);

1047

}

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1048

1013

}

1049

1014

}

1050

1015

}

1061

1026

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

1027

flags,

1063

1028

AVAHI_GCC_UNUSED void* userdata){

1064

if(b == NULL){

1065

return;

1066

}

1029

assert(b);

1067

1030

1068

1031

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

1069

1032

is removed from the LAN */

1076

1039

default:

1077

1040

case AVAHI_BROWSER_FAILURE:

1078

1041

1079

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1081

1044

avahi_simple_poll_quit(mc.simple_poll);

1082

1045

return;

1083

1046

1090

1053

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

1091

1054

name, type, domain, protocol, 0,

1092

1055

resolve_callback, NULL) == NULL)

1093

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

1094

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1056

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

1057

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

1096

1058

break;

1097

1059

1098

1060

case AVAHI_BROWSER_REMOVE:

1101

1063

case AVAHI_BROWSER_ALL_FOR_NOW:

1102

1064

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1103

1065

if(debug){

1104

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

1105

" searching...\n");

1066

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

1106

1067

}

1107

1068

break;

1108

1069

}

1123

1084

errno = old_errno;

1124

1085

}

1125

1086

1126

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

1127

int ret;

1128

error_t ret_errno;

1129

1130

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

1131

if(s < 0){

1132

ret_errno = errno;

1133

perror_plus("socket");

1134

errno = ret_errno;

1135

return false;

1136

}

1137

strcpy(ifr->ifr_name, ifname);

1138

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1139

if(ret == -1){

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1140

1143

if(debug){

1141

ret_errno = errno;

1142

perror_plus("ioctl SIOCGIFFLAGS");

1143

errno = ret_errno;

1144

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

1145

flagstring, if_entry->d_name);

1144

1146

}

1145

return false;

1147

free(flagstring);

1148

return 0;

1146

1149

}

1147

return true;

1148

}

1149

1150

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

1151

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

/* Reject the loopback device */

1153

if(ifr->ifr_flags & IFF_LOOPBACK){

1153

if(flags & IFF_LOOPBACK){

1154

if(debug){

1155

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

1156

ifname);

1155

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

1156

if_entry->d_name);

1157

}

1158

return false;

1158

return 0;

1159

}

1160

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

1161

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

1161

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

1162

if(debug){

1163

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

1164

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

1163

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

1164

if_entry->d_name);

1165

}

1166

return true;

1166

return 1;

1167

}

1168

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

1169

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

1169

if(not (flags & IFF_BROADCAST)){

1170

if(debug){

1171

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1172

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

1171

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

1172

if_entry->d_name);

1173

}

1174

return false;

1174

return 0;

1175

}

1176

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

1177

if(ifr->ifr_flags & IFF_NOARP){

1177

if(flags & IFF_NOARP){

1178

if(debug){

1179

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

1180

ifname);

1179

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

1180

if_entry->d_name);

1181

}

1182

return false;

1182

return 0;

1183

}

1184

1185

1184

/* Accept this device */

1186

1185

if(debug){

1187

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

1188

}

1189

return true;

1190

}

1191

1192

/*

1193

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

1194

* corresponds to an acceptable network device.

1195

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

1196

*/

1197

int good_interface(const struct dirent *if_entry){

1198

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

1199

return 0;

1200

}

1201

1202

struct ifreq ifr;

1203

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

1204

if(debug){

1205

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

1206

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

1207

}

1208

return 0;

1209

}

1210

1211

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

1212

return 0;

1186

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

1187

if_entry->d_name);

1213

1188

}

1214

1189

return 1;

1215

1190

}

1216

1191

1217

/*

1218

* This function determines if a network interface is up.

1219

*/

1220

bool interface_is_up(const char *interface){

1221

struct ifreq ifr;

1222

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

1223

if(debug){

1224

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

1225

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

1226

}

1227

return false;

1228

}

1229

1230

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

1231

}

1232

1233

/*

1234

* This function determines if a network interface is running

1235

*/

1236

bool interface_is_running(const char *interface){

1237

struct ifreq ifr;

1238

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

1239

if(debug){

1240

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

1241

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

1242

}

1243

return false;

1244

}

1245

1246

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

1247

}

1248

1249

1192

int notdotentries(const struct dirent *direntry){

1250

1193

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

1251

1194

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

1257

1200

return 1;

1258

1201

}

1259

1202

1260

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

1261

int runnable_hook(const struct dirent *direntry){

1262

int ret;

1263

size_t sret;

1264

struct stat st;

1265

1266

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

1267

/* Empty name? */

1268

return 0;

1269

}

1270

1271

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

1272

"abcdefghijklmnopqrstuvwxyz"

1273

"0123456789"

1274

"_-");

1275

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

1276

/* Contains non-allowed characters */

1277

if(debug){

1278

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

1279

direntry->d_name);

1280

}

1281

return 0;

1282

}

1283

1284

char *fullname = NULL;

1285

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

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1292

if(ret == -1){

1293

if(debug){

1294

perror_plus("Could not stat hook");

1295

}

1296

return 0;

1297

}

1298

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

1299

/* Not a regular file */

1300

if(debug){

1301

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

1302

direntry->d_name);

1303

}

1304

return 0;

1305

}

1306

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

1307

/* Not executable */

1308

if(debug){

1309

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

1310

direntry->d_name);

1311

}

1312

return 0;

1313

}

1314

if(debug){

1315

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

1316

direntry->d_name);

1317

}

1318

return 1;

1319

}

1320

1321

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1322

1204

int ret;

1323

1205

struct timespec now;

1324

1206

struct timespec waited_time;

1325

1207

intmax_t block_time;

1326

1208

1327

1209

while(true){

1328

1210

if(mc.current_server == NULL){

1329

1211

if (debug){

1330

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

1331

" No timeout!\n");

1212

fprintf(stderr,

1213

"Wait until first server is found. No timeout!\n");

1332

1214

}

1333

1215

ret = avahi_simple_poll_iterate(s, -1);

1334

1216

} else {

1335

1217

if (debug){

1336

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

1337

" it, or wait\n");

1218

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

1219

" or wait\n");

1338

1220

}

1339

1221

/* the current time */

1340

1222

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1354

1236

block_time = ((retry_interval

1355

1237

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

1356

1238

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

1357

1239

1358

1240

if (debug){

1359

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

1360

block_time);

1241

fprintf(stderr, "Blocking for %ld ms\n", block_time);

1361

1242

}

1362

1243

1363

1244

if(block_time <= 0){

1364

1245

ret = start_mandos_communication(mc.current_server->ip,

1365

1246

mc.current_server->port,

1383

1264

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

1384

1265

}

1385

1266

if(ret != 0){

1386

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

1267

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

1387

1268

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

1388

1269

}

1389

1270

}

1390

1271

}

1391

1272

}

1392

1273

1393

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

1394

error_t raise_privileges(void){

1395

error_t old_errno = errno;

1396

error_t ret_errno = 0;

1397

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

1398

ret_errno = errno;

1399

perror_plus("seteuid");

1400

}

1401

errno = old_errno;

1402

return ret_errno;

1403

}

1404

1405

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

1406

error_t raise_privileges_permanently(void){

1407

error_t old_errno = errno;

1408

error_t ret_errno = raise_privileges();

1409

if(ret_errno != 0){

1410

errno = old_errno;

1411

return ret_errno;

1412

}

1413

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

1414

ret_errno = errno;

1415

perror_plus("seteuid");

1416

}

1417

errno = old_errno;

1418

return ret_errno;

1419

}

1420

1421

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

1422

error_t lower_privileges(void){

1423

error_t old_errno = errno;

1424

error_t ret_errno = 0;

1425

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

1426

ret_errno = errno;

1427

perror_plus("seteuid");

1428

}

1429

errno = old_errno;

1430

return ret_errno;

1431

}

1432

1433

/* Lower privileges permanently */

1434

error_t lower_privileges_permanently(void){

1435

error_t old_errno = errno;

1436

error_t ret_errno = 0;

1437

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

1438

ret_errno = errno;

1439

perror_plus("setuid");

1440

}

1441

errno = old_errno;

1442

return ret_errno;

1443

}

1444

1445

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

1446

const float delay){

1447

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

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

1451

alphasort);

1452

if(numhooks == -1){

1453

if(errno == ENOENT){

1454

if(debug){

1455

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

1456

" found\n", hookdir);

1457

}

1458

} else {

1459

perror_plus("scandir");

1460

}

1461

} else {

1462

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

1463

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

1464

direntry = direntries[i];

1465

char *fullname = NULL;

1466

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

1467

if(ret < 0){

1468

perror_plus("asprintf");

1469

continue;

1470

}

1471

if(debug){

1472

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

1473

direntry->d_name);

1474

}

1475

pid_t hook_pid = fork();

1476

if(hook_pid == 0){

1477

/* Child */

1478

/* Raise privileges */

1479

raise_privileges_permanently();

1480

/* Set group */

1481

errno = 0;

1482

ret = setgid(0);

1483

if(ret == -1){

1484

perror_plus("setgid");

1485

}

1486

/* Reset supplementary groups */

1487

errno = 0;

1488

ret = setgroups(0, NULL);

1489

if(ret == -1){

1490

perror_plus("setgroups");

1491

}

1492

dup2(devnull, STDIN_FILENO);

1493

close(devnull);

1494

dup2(STDERR_FILENO, STDOUT_FILENO);

1495

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

1496

if(ret == -1){

1497

perror_plus("setenv");

1498

_exit(EX_OSERR);

1499

}

1500

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

1501

if(ret == -1){

1502

perror_plus("setenv");

1503

_exit(EX_OSERR);

1504

}

1505

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

1506

if(ret == -1){

1507

perror_plus("setenv");

1508

_exit(EX_OSERR);

1509

}

1510

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

1511

if(ret == -1){

1512

perror_plus("setenv");

1513

_exit(EX_OSERR);

1514

}

1515

char *delaystring;

1516

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

1517

if(ret == -1){

1518

perror_plus("asprintf");

1519

_exit(EX_OSERR);

1520

}

1521

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

1522

if(ret == -1){

1523

free(delaystring);

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

1527

free(delaystring);

1528

if(connect_to != NULL){

1529

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

1530

if(ret == -1){

1531

perror_plus("setenv");

1532

_exit(EX_OSERR);

1533

}

1534

}

1535

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

1536

perror_plus("execl");

1537

_exit(EXIT_FAILURE);

1538

}

1539

} else {

1540

int status;

1541

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

1542

perror_plus("waitpid");

1543

free(fullname);

1544

continue;

1545

}

1546

if(WIFEXITED(status)){

1547

if(WEXITSTATUS(status) != 0){

1548

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

1549

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

1550

WEXITSTATUS(status));

1551

free(fullname);

1552

continue;

1553

}

1554

} else if(WIFSIGNALED(status)){

1555

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

1556

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

1557

WTERMSIG(status));

1558

free(fullname);

1559

continue;

1560

} else {

1561

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

1562

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

1563

free(fullname);

1564

continue;

1565

}

1566

}

1567

free(fullname);

1568

if(debug){

1569

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

1570

direntry->d_name);

1571

}

1572

}

1573

close(devnull);

1574

}

1575

return true;

1576

}

1577

1578

error_t bring_up_interface(const char *const interface,

1579

const float delay){

1580

int sd = -1;

1581

error_t old_errno = errno;

1582

error_t ret_errno = 0;

1583

int ret, ret_setflags;

1584

struct ifreq network;

1585

unsigned int if_index = if_nametoindex(interface);

1586

if(if_index == 0){

1587

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

1588

errno = old_errno;

1589

return ENXIO;

1590

}

1591

1592

if(quit_now){

1593

errno = old_errno;

1594

return EINTR;

1595

}

1596

1597

if(not interface_is_up(interface)){

1598

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

1599

ret_errno = errno;

1600

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

1601

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

1602

return ret_errno;

1603

}

1604

network.ifr_flags |= IFF_UP;

1605

1606

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1607

if(sd < 0){

1608

ret_errno = errno;

1609

perror_plus("socket");

1610

errno = old_errno;

1611

return ret_errno;

1612

}

1613

1614

if(quit_now){

1615

close(sd);

1616

errno = old_errno;

1617

return EINTR;

1618

}

1619

1620

if(debug){

1621

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

1622

interface);

1623

}

1624

1625

/* Raise priviliges */

1626

raise_privileges();

1627

1628

#ifdef __linux__

1629

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1630

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

1631

int ret_linux = klogctl(8, NULL, 5);

1632

bool restore_loglevel = true;

1633

if(ret_linux == -1){

1634

restore_loglevel = false;

1635

perror_plus("klogctl");

1636

}

1637

#endif /* __linux__ */

1638

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

1639

ret_errno = errno;

1640

#ifdef __linux__

1641

if(restore_loglevel){

1642

ret_linux = klogctl(7, NULL, 0);

1643

if(ret_linux == -1){

1644

perror_plus("klogctl");

1645

}

1646

}

1647

#endif /* __linux__ */

1648

1649

/* Lower privileges */

1650

lower_privileges();

1651

1652

/* Close the socket */

1653

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

1654

if(ret == -1){

1655

perror_plus("close");

1656

}

1657

1658

if(ret_setflags == -1){

1659

errno = ret_errno;

1660

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1661

errno = old_errno;

1662

return ret_errno;

1663

}

1664

} else if(debug){

1665

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

1666

interface);

1667

}

1668

1669

/* Sleep checking until interface is running.

1670

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

1671

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

1672

if(interface_is_running(interface)){

1673

break;

1674

}

1675

struct timespec sleeptime = { .tv_nsec = 250000000 };

1676

ret = nanosleep(&sleeptime, NULL);

1677

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

1678

perror_plus("nanosleep");

1679

}

1680

}

1681

1682

errno = old_errno;

1683

return 0;

1684

}

1685

1686

error_t take_down_interface(const char *const interface){

1687

int sd = -1;

1688

error_t old_errno = errno;

1689

error_t ret_errno = 0;

1690

int ret, ret_setflags;

1691

struct ifreq network;

1692

unsigned int if_index = if_nametoindex(interface);

1693

if(if_index == 0){

1694

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

1695

errno = old_errno;

1696

return ENXIO;

1697

}

1698

if(interface_is_up(interface)){

1699

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

1700

ret_errno = errno;

1701

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

1702

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

1703

return ret_errno;

1704

}

1705

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

1706

1707

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1708

if(sd < 0){

1709

ret_errno = errno;

1710

perror_plus("socket");

1711

errno = old_errno;

1712

return ret_errno;

1713

}

1714

1715

if(debug){

1716

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

1717

interface);

1718

}

1719

1720

/* Raise priviliges */

1721

raise_privileges();

1722

1723

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

1724

ret_errno = errno;

1725

1726

/* Lower privileges */

1727

lower_privileges();

1728

1729

/* Close the socket */

1730

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

1731

if(ret == -1){

1732

perror_plus("close");

1733

}

1734

1735

if(ret_setflags == -1){

1736

errno = ret_errno;

1737

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1738

errno = old_errno;

1739

return ret_errno;

1740

}

1741

} else if(debug){

1742

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

1743

interface);

1744

}

1745

1746

errno = old_errno;

1747

return 0;

1748

}

1749

1750

1274

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

1751

1275

AvahiSServiceBrowser *sb = NULL;

1752

error_t ret_errno;

1276

int error;

1753

1277

int ret;

1754

1278

intmax_t tmpmax;

1755

1279

char *tmp;

1756

1280

int exitcode = EXIT_SUCCESS;

1757

char *interfaces = NULL;

1758

size_t interfaces_size = 0;

1759

char *interfaces_to_take_down = NULL;

1760

size_t interfaces_to_take_down_size = 0;

1281

const char *interface = "";

1282

struct ifreq network;

1283

int sd = -1;

1284

bool take_down_interface = false;

1285

uid_t uid;

1286

gid_t gid;

1761

1287

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

1762

1288

bool tempdir_created = false;

1763

1289

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1764

1290

const char *seckey = PATHDIR "/" SECKEY;

1765

1291

const char *pubkey = PATHDIR "/" PUBKEY;

1766

char *interfaces_hooks = NULL;

1767

size_t interfaces_hooks_size = 0;

1768

1292

1769

1293

bool gnutls_initialized = false;

1770

1294

bool gpgme_initialized = false;

1832

1356

.group = 2 },

1833

1357

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

1834

1358

.arg = "SECONDS",

1835

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

1836

.group = 2 },

1837

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

1838

.arg = "DIR",

1839

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

1359

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

1840

1360

.group = 2 },

1841

1361

/*

1842

1362

* These reproduce what we would get without ARGP_NO_HELP

1861

1381

connect_to = arg;

1862

1382

break;

1863

1383

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

1864

ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,

1865

(int)',');

1866

if(ret_errno != 0){

1867

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

1868

}

1384

interface = arg;

1869

1385

break;

1870

1386

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

1871

1387

seckey = arg;

1895

1411

errno = 0;

1896

1412

retry_interval = strtod(arg, &tmp);

1897

1413

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

1898

or (retry_interval * 1000) > INT_MAX

1899

or retry_interval < 0){

1414

or (retry_interval * 1000) > INT_MAX){

1900

1415

argp_error(state, "Bad retry interval");

1901

1416

}

1902

1417

break;

1903

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

1904

hookdir = arg;

1905

break;

1906

1418

/*

1907

1419

* These reproduce what we would get without ARGP_NO_HELP

1908

1420

*/

1914

1426

argp_state_help(state, state->out_stream,

1915

1427

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1916

1428

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

1917

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

1429

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

1918

1430

exit(argp_err_exit_status);

1919

1431

break;

1920

1432

default:

1947

1459

{

1948

1460

/* Work around Debian bug #633582:

1949

1461

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

1462

struct stat st;

1950

1463

1951

1464

/* Re-raise priviliges */

1952

if(raise_privileges() == 0){

1953

struct stat st;

1954

1955

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

1956

int seckey_fd = open(seckey, O_RDONLY);

1957

if(seckey_fd == -1){

1958

perror_plus("open");

1959

} else {

1960

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

1961

if(ret == -1){

1962

perror_plus("fstat");

1963

} else {

1964

if(S_ISREG(st.st_mode)

1965

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

1966

ret = fchown(seckey_fd, uid, gid);

1967

if(ret == -1){

1968

perror_plus("fchown");

1969

}

1970

}

1971

}

1972

TEMP_FAILURE_RETRY(close(seckey_fd));

1973

}

1974

}

1975

1976

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

1977

int pubkey_fd = open(pubkey, O_RDONLY);

1978

if(pubkey_fd == -1){

1979

perror_plus("open");

1980

} else {

1981

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

1982

if(ret == -1){

1983

perror_plus("fstat");

1984

} else {

1985

if(S_ISREG(st.st_mode)

1986

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

1987

ret = fchown(pubkey_fd, uid, gid);

1988

if(ret == -1){

1989

perror_plus("fchown");

1990

}

1991

}

1992

}

1993

TEMP_FAILURE_RETRY(close(pubkey_fd));

1994

}

1995

}

1996

1997

/* Lower privileges */

1998

errno = 0;

1999

ret = seteuid(uid);

2000

if(ret == -1){

2001

perror_plus("seteuid");

2002

}

2003

}

2004

}

2005

2006

/* Remove empty interface names */

2007

{

2008

char *interface = NULL;

2009

while((interface = argz_next(interfaces, interfaces_size,

2010

interface))){

2011

if(if_nametoindex(interface) == 0){

2012

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

2013

fprintf_plus(stderr, "Not using nonexisting interface"

2014

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

2015

}

2016

argz_delete(&interfaces, &interfaces_size, interface);

2017

interface = NULL;

2018

}

2019

}

2020

}

2021

2022

/* Run network hooks */

2023

{

2024

2025

if(interfaces != NULL){

2026

interfaces_hooks = malloc(interfaces_size);

2027

if(interfaces_hooks == NULL){

2028

perror_plus("malloc");

2029

goto end;

2030

}

2031

memcpy(interfaces_hooks, interfaces, interfaces_size);

2032

interfaces_hooks_size = interfaces_size;

2033

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2034

(int)',');

2035

}

2036

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2037

interfaces_hooks : "", delay)){

2038

goto end;

1465

errno = 0;

1466

ret = seteuid(0);

1467

if(ret == -1){

1468

perror_plus("seteuid");

1469

}

1470

1471

int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);

1472

if(seckey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

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

1476

if(ret == -1){

1477

perror_plus("fstat");

1478

} else {

1479

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

1480

ret = fchown(seckey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(seckey_fd));

1487

}

1488

1489

int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);

1490

if(pubkey_fd == -1){

1491

perror_plus("open");

1492

} else {

1493

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

1494

if(ret == -1){

1495

perror_plus("fstat");

1496

} else {

1497

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

1498

ret = fchown(pubkey_fd, uid, gid);

1499

if(ret == -1){

1500

perror_plus("fchown");

1501

}

1502

}

1503

}

1504

TEMP_FAILURE_RETRY(close(pubkey_fd));

1505

}

1506

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror_plus("seteuid");

2039

1512

}

2040

1513

}

2041

1514

2042

1515

if(not debug){

2043

1516

avahi_set_log_function(empty_log);

2044

1517

}

1518

1519

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

1520

struct dirent **direntries;

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1522

alphasort);

1523

if(ret >= 1){

1524

/* Pick the first good interface */

1525

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

1526

if(debug){

1527

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

1528

}

1529

if(interface == NULL){

1530

perror_plus("malloc");

1531

free(direntries);

1532

exitcode = EXIT_FAILURE;

1533

goto end;

1534

}

1535

free(direntries);

1536

} else {

1537

free(direntries);

1538

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

1539

exitcode = EXIT_FAILURE;

1540

goto end;

1541

}

1542

}

2045

1543

2046

1544

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

2047

1545

from the signal handler */

2049

1547

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

2050

1548

mc.simple_poll = avahi_simple_poll_new();

2051

1549

if(mc.simple_poll == NULL){

2052

fprintf_plus(stderr,

2053

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

1550

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

2054

1551

exitcode = EX_UNAVAILABLE;

2055

1552

goto end;

2056

1553

}

2118

1615

}

2119

1616

}

2120

1617

2121

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

2122

if(interfaces == NULL){

2123

struct dirent **direntries;

2124

/* Look for any good interfaces */

2125

ret = scandir(sys_class_net, &direntries, good_interface,

2126

alphasort);

2127

if(ret >= 1){

2128

/* Add all found interfaces to interfaces list */

2129

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

2130

ret_errno = argz_add(&interfaces, &interfaces_size,

2131

direntries[i]->d_name);

2132

if(ret_errno != 0){

2133

perror_plus("argz_add");

2134

continue;

2135

}

2136

if(debug){

2137

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

2138

direntries[i]->d_name);

2139

}

2140

}

2141

free(direntries);

1618

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

1619

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

1620

if_index = (AvahiIfIndex) if_nametoindex(interface);

1621

if(if_index == 0){

1622

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

1623

exitcode = EX_UNAVAILABLE;

1624

goto end;

1625

}

1626

1627

if(quit_now){

1628

goto end;

1629

}

1630

1631

/* Re-raise priviliges */

1632

errno = 0;

1633

ret = seteuid(0);

1634

if(ret == -1){

1635

perror_plus("seteuid");

1636

}

1637

1638

#ifdef __linux__

1639

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1640

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

1641

ret = klogctl(8, NULL, 5);

1642

bool restore_loglevel = true;

1643

if(ret == -1){

1644

restore_loglevel = false;

1645

perror_plus("klogctl");

1646

}

1647

#endif /* __linux__ */

1648

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1651

perror_plus("socket");

1652

exitcode = EX_OSERR;

1653

#ifdef __linux__

1654

if(restore_loglevel){

1655

ret = klogctl(7, NULL, 0);

1656

if(ret == -1){

1657

perror_plus("klogctl");

1658

}

1659

}

1660

#endif /* __linux__ */

1661

/* Lower privileges */

1662

errno = 0;

1663

ret = seteuid(uid);

1664

if(ret == -1){

1665

perror_plus("seteuid");

1666

}

1667

goto end;

1668

}

1669

strcpy(network.ifr_name, interface);

1670

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

1671

if(ret == -1){

1672

perror_plus("ioctl SIOCGIFFLAGS");

1673

#ifdef __linux__

1674

if(restore_loglevel){

1675

ret = klogctl(7, NULL, 0);

1676

if(ret == -1){

1677

perror_plus("klogctl");

1678

}

1679

}

1680

#endif /* __linux__ */

1681

exitcode = EX_OSERR;

1682

/* Lower privileges */

1683

errno = 0;

1684

ret = seteuid(uid);

1685

if(ret == -1){

1686

perror_plus("seteuid");

1687

}

1688

goto end;

1689

}

1690

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

1691

network.ifr_flags |= IFF_UP;

1692

take_down_interface = true;

1693

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

1694

if(ret == -1){

1695

take_down_interface = false;

1696

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1697

exitcode = EX_OSERR;

1698

#ifdef __linux__

1699

if(restore_loglevel){

1700

ret = klogctl(7, NULL, 0);

1701

if(ret == -1){

1702

perror_plus("klogctl");

1703

}

1704

}

1705

#endif /* __linux__ */

1706

/* Lower privileges */

1707

errno = 0;

1708

ret = seteuid(uid);

1709

if(ret == -1){

1710

perror_plus("seteuid");

1711

}

1712

goto end;

1713

}

1714

}

1715

/* Sleep checking until interface is running.

1716

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

1717

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

1718

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

1719

if(ret == -1){

1720

perror_plus("ioctl SIOCGIFFLAGS");

1721

} else if(network.ifr_flags & IFF_RUNNING){

1722

break;

1723

}

1724

struct timespec sleeptime = { .tv_nsec = 250000000 };

1725

ret = nanosleep(&sleeptime, NULL);

1726

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

1727

perror_plus("nanosleep");

1728

}

1729

}

1730

if(not take_down_interface){

1731

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

1732

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

1733

if(ret == -1){

1734

perror_plus("close");

1735

}

1736

}

1737

#ifdef __linux__

1738

if(restore_loglevel){

1739

/* Restores kernel loglevel to default */

1740

ret = klogctl(7, NULL, 0);

1741

if(ret == -1){

1742

perror_plus("klogctl");

1743

}

1744

}

1745

#endif /* __linux__ */

1746

/* Lower privileges */

1747

errno = 0;

1748

if(take_down_interface){

1749

/* Lower privileges */

1750

ret = seteuid(uid);

1751

if(ret == -1){

1752

perror_plus("seteuid");

1753

}

2142

1754

} else {

2143

free(direntries);

2144

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

2145

exitcode = EXIT_FAILURE;

2146

goto end;

2147

}

2148

}

2149

2150

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

2151

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

2152

if(debug){

2153

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

2154

interfaces);

2155

}

2156

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2157

}

2158

2159

/* Bring up interfaces which are down */

2160

if(not (argz_count(interfaces, interfaces_size) == 1

2161

and strcmp(interfaces, "none") == 0)){

2162

char *interface = NULL;

2163

while((interface = argz_next(interfaces, interfaces_size,

2164

interface))){

2165

bool interface_was_up = interface_is_up(interface);

2166

ret = bring_up_interface(interface, delay);

2167

if(not interface_was_up){

2168

if(ret != 0){

2169

errno = ret;

2170

perror_plus("Failed to bring up interface");

2171

} else {

2172

ret_errno = argz_add(&interfaces_to_take_down,

2173

&interfaces_to_take_down_size,

2174

interface);

2175

}

1755

/* Lower privileges permanently */

1756

ret = setuid(uid);

1757

if(ret == -1){

1758

perror_plus("setuid");

2176

1759

}

2177

1760

}

2178

free(interfaces);

2179

interfaces = NULL;

2180

interfaces_size = 0;

2181

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

2182

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

2183

}

2184

1761

}

2185

1762

2186

1763

if(quit_now){

2189

1766

2190

1767

ret = init_gnutls_global(pubkey, seckey);

2191

1768

if(ret == -1){

2192

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

1769

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

2193

1770

exitcode = EX_UNAVAILABLE;

2194

1771

goto end;

2195

1772

} else {

2211

1788

}

2212

1789

2213

1790

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

2214

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

1791

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

2215

1792

exitcode = EX_UNAVAILABLE;

2216

1793

goto end;

2217

1794

} else {

2226

1803

/* Connect directly, do not use Zeroconf */

2227

1804

/* (Mainly meant for debugging) */

2228

1805

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

2229

2230

1806

if(address == NULL){

2231

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

1807

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

2232

1808

exitcode = EX_USAGE;

2233

1809

goto end;

2234

1810

}

2237

1813

goto end;

2238

1814

}

2239

1815

2240

in_port_t port;

1816

uint16_t port;

2241

1817

errno = 0;

2242

1818

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

2243

1819

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

2244

or tmpmax != (in_port_t)tmpmax){

2245

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

1820

or tmpmax != (uint16_t)tmpmax){

1821

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

2246

1822

exitcode = EX_USAGE;

2247

1823

goto end;

2248

1824

}

2251

1827

goto end;

2252

1828

}

2253

1829

2254

port = (in_port_t)tmpmax;

1830

port = (uint16_t)tmpmax;

2255

1831

*address = '\0';

1832

address = connect_to;

2256

1833

/* Colon in address indicates IPv6 */

2257

1834

int af;

2258

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

1835

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

2259

1836

af = AF_INET6;

2260

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

2261

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

2262

{

2263

connect_to++;

2264

address[-1] = '\0';

2265

}

2266

1837

} else {

2267

1838

af = AF_INET;

2268

1839

}

2269

address = connect_to;

2270

1840

2271

1841

if(quit_now){

2272

1842

goto end;

2273

1843

}

2274

1844

2275

1845

while(not quit_now){

2276

1846

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

2277

1847

if(quit_now or ret == 0){

2278

1848

break;

2279

1849

}

2280

if(debug){

2281

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

2282

(int)retry_interval);

2283

}

2284

sleep((int)retry_interval);

2285

}

2286

1850

sleep((int)retry_interval or 1);

1851

};

1852

2287

1853

if (not quit_now){

2288

1854

exitcode = EXIT_SUCCESS;

2289

1855

}

2290

1856

2291

1857

goto end;

2292

1858

}

2293

1859

2307

1873

/* Allocate a new server */

2308

1874

mc.server = avahi_server_new(avahi_simple_poll_get

2309

1875

(mc.simple_poll), &config, NULL,

2310

NULL, &ret_errno);

1876

NULL, &error);

2311

1877

2312

1878

/* Free the Avahi configuration data */

2313

1879

avahi_server_config_free(&config);

2315

1881

2316

1882

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

2317

1883

if(mc.server == NULL){

2318

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

2319

avahi_strerror(ret_errno));

1884

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

1885

avahi_strerror(error));

2320

1886

exitcode = EX_UNAVAILABLE;

2321

1887

goto end;

2322

1888

}

2330

1896

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2331

1897

NULL, 0, browse_callback, NULL);

2332

1898

if(sb == NULL){

2333

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

2334

avahi_strerror(avahi_server_errno(mc.server)));

1899

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

1900

avahi_strerror(avahi_server_errno(mc.server)));

2335

1901

exitcode = EX_UNAVAILABLE;

2336

1902

goto end;

2337

1903

}

2343

1909

/* Run the main loop */

2344

1910

2345

1911

if(debug){

2346

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

1912

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

2347

1913

}

2348

1914

2349

1915

ret = avahi_loop_with_timeout(mc.simple_poll,

2350

1916

(int)(retry_interval * 1000));

2351

1917

if(debug){

2352

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

2353

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

1918

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

1919

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

2354

1920

}

2355

1921

2356

1922

end:

2357

1923

2358

1924

if(debug){

2359

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

1925

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

2360

1926

}

2361

1927

2362

1928

/* Cleanup things */

2378

1944

if(gpgme_initialized){

2379

1945

gpgme_release(mc.ctx);

2380

1946

}

2381

1947

2382

1948

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

2383

1949

has seen */

2384

1950

if(mc.current_server != NULL){

2390

1956

}

2391

1957

}

2392

1958

2393

/* Re-raise priviliges */

2394

{

2395

raise_privileges();

2396

2397

/* Run network hooks */

2398

run_network_hooks("stop", interfaces_hooks != NULL ?

2399

interfaces_hooks : "", delay);

2400

2401

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

2402

{

2403

char *interface = NULL;

2404

while((interface=argz_next(interfaces_to_take_down,

2405

interfaces_to_take_down_size,

2406

interface))){

2407

ret_errno = take_down_interface(interface);

2408

if(ret_errno != 0){

2409

errno = ret_errno;

2410

perror_plus("Failed to take down interface");

1959

/* Take down the network interface */

1960

if(take_down_interface){

1961

/* Re-raise priviliges */

1962

errno = 0;

1963

ret = seteuid(0);

1964

if(ret == -1){

1965

perror_plus("seteuid");

1966

}

1967

if(geteuid() == 0){

1968

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

1969

if(ret == -1){

1970

perror_plus("ioctl SIOCGIFFLAGS");

1971

} else if(network.ifr_flags & IFF_UP) {

1972

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

1973

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

1974

if(ret == -1){

1975

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2411

1976

}

2412

1977

}

2413

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

2414

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

2415

" down\n");

1978

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

1979

if(ret == -1){

1980

perror_plus("close");

1981

}

1982

/* Lower privileges permanently */

1983

errno = 0;

1984

ret = setuid(uid);

1985

if(ret == -1){

1986

perror_plus("setuid");

2416

1987

}

2417

1988

}

2418

2419

lower_privileges_permanently();

2420

1989

}

2421

1990

2422

free(interfaces_to_take_down);

2423

free(interfaces_hooks);

2424

2425

1991

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

2426

1992

if(tempdir_created){

2427

1993

struct dirent **direntries = NULL;

2428

1994

struct dirent *direntry = NULL;

2429

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

2430

alphasort);

2431

if (numentries > 0){

2432

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

1995

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1996

if (ret > 0){

1997

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

2433

1998

direntry = direntries[i];

2434

1999

char *fullname = NULL;

2435

2000

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

2440

2005

}

2441

2006

ret = remove(fullname);

2442

2007

if(ret == -1){

2443

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

2444

strerror(errno));

2008

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

2009

strerror(errno));

2445

2010

}

2446

2011

free(fullname);

2447

2012

}

2448

2013

}

2449

2014

2450

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

2015

/* need to be cleaned even if ret == 0 because man page doesn't

2016

specify */

2451

2017

free(direntries);

2452

if (numentries == -1){

2018

if (ret == -1){

2453

2019

perror_plus("scandir");

2454

2020

}

2455

2021

ret = rmdir(tempdir);