/mandos/release : revision 237.22.4

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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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/* 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, program_invocation_short_name */

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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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#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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96

#ifdef __linux__

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97

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

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115

init_gnutls_session(),

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116

GNUTLS_* */

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117

#include <gnutls/openpgp.h>

110

/* 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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120

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121

/* GPGME */

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122

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

122

130

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

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131

#define SECKEY "seckey.txt"

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132

#define PUBKEY "pubkey.txt"

133

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

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134

126

135

bool debug = false;

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136

static const char mandos_protocol_version[] = "1";

128

137

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

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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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139

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

131

140

char *connect_to = NULL;

141

const char *hookdir = HOOKDIR;

142

uid_t uid = 65534;

143

gid_t gid = 65534;

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144

133

/* Doubly linked list that need to be circular linked when ever used */

145

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

134

146

typedef struct server{

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147

const char *ip;

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148

uint16_t port;

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168

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

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169

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

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170

.dh_bits = 1024, .priority = "SECURE256"

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":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };

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

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.current_server = NULL };

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173

161

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sig_atomic_t quit_now = 0;

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175

int signal_received = 0;

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176

164

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/* Function to use when printing errors */

165

178

void perror_plus(const char *print_text){

166

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

179

int e = errno;

180

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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184

}

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185

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

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

188

va_list ap;

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va_start (ap, format);

190

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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));

194

}

195

170

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/*

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197

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

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198

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

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199

* "buffer_length" is how much is already used.

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200

*/

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

202

size_t buffer_capacity){

177

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

178

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

179

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if(buffer == NULL){

184

210

return buffer_capacity;

185

211

}

186

212

187

int add_server(const char *ip, uint16_t port,

188

AvahiIfIndex if_index,

189

int af){

213

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

214

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

215

int af){

190

216

int ret;

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217

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

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if(new_server == NULL){

193

219

perror_plus("malloc");

194

return -1;

220

return false;

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221

}

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

197

.port = port,

198

.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

225

.af = af };

200

226

if(new_server->ip == NULL){

201

227

perror_plus("strdup");

202

return -1;

228

return false;

203

229

}

204

/* uniqe case of first server */

230

/* Special case of first server */

205

231

if (mc.current_server == NULL){

206

232

new_server->next = new_server;

207

233

new_server->prev = new_server;

208

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mc.current_server = new_server;

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

235

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

210

236

} else {

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new_server->next = mc.current_server;

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238

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

216

242

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

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243

if(ret == -1){

218

244

perror_plus("clock_gettime");

219

return -1;

245

return false;

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246

}

221

return 0;

247

return true;

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248

}

223

249

224

250

/*

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251

* Initialize GPGME.

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252

*/

227

static bool init_gpgme(const char *seckey,

228

const char *pubkey, const char *tempdir){

253

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

254

const char *tempdir){

229

255

gpgme_error_t rc;

230

256

gpgme_engine_info_t engine_info;

231

257

246

272

247

273

rc = gpgme_data_new_from_fd(&pgp_data, fd);

248

274

if(rc != GPG_ERR_NO_ERROR){

249

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

250

gpgme_strsource(rc), gpgme_strerror(rc));

275

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

276

gpgme_strsource(rc), gpgme_strerror(rc));

251

277

return false;

252

278

}

253

279

254

280

rc = gpgme_op_import(mc.ctx, pgp_data);

255

281

if(rc != GPG_ERR_NO_ERROR){

256

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

257

gpgme_strsource(rc), gpgme_strerror(rc));

282

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

283

gpgme_strsource(rc), gpgme_strerror(rc));

258

284

return false;

259

285

}

260

286

267

293

}

268

294

269

295

if(debug){

270

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

296

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

271

297

}

272

298

273

299

/* Init GPGME */

274

300

gpgme_check_version(NULL);

275

301

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

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302

if(rc != GPG_ERR_NO_ERROR){

277

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

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gpgme_strsource(rc), gpgme_strerror(rc));

303

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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305

return false;

280

306

}

281

307

282

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

308

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

283

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rc = gpgme_get_engine_info(&engine_info);

284

310

if(rc != GPG_ERR_NO_ERROR){

285

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

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gpgme_strsource(rc), gpgme_strerror(rc));

311

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

312

gpgme_strsource(rc), gpgme_strerror(rc));

287

313

return false;

288

314

}

289

315

while(engine_info != NULL){

295

321

engine_info = engine_info->next;

296

322

}

297

323

if(engine_info == NULL){

298

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

324

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

325

tempdir);

299

326

return false;

300

327

}

301

328

302

329

/* Create new GPGME "context" */

303

330

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

304

331

if(rc != GPG_ERR_NO_ERROR){

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

332

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

333

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

334

gpgme_strerror(rc));

307

335

return false;

308

336

}

309

337

328

356

ssize_t plaintext_length = 0;

329

357

330

358

if(debug){

331

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

359

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

332

360

}

333

361

334

362

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

335

363

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

336

364

0);

337

365

if(rc != GPG_ERR_NO_ERROR){

338

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

339

gpgme_strsource(rc), gpgme_strerror(rc));

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

340

368

return -1;

341

369

}

342

370

343

371

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

344

372

rc = gpgme_data_new(&dh_plain);

345

373

if(rc != GPG_ERR_NO_ERROR){

346

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

347

gpgme_strsource(rc), gpgme_strerror(rc));

374

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

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

348

377

gpgme_data_release(dh_crypto);

349

378

return -1;

350

379

}

353

382

data buffer */

354

383

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

355

384

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

385

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

386

gpgme_strsource(rc), gpgme_strerror(rc));

358

387

plaintext_length = -1;

359

388

if(debug){

360

389

gpgme_decrypt_result_t result;

361

390

result = gpgme_op_decrypt_result(mc.ctx);

362

391

if(result == NULL){

363

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

392

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

364

393

} else {

365

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

366

result->unsupported_algorithm);

367

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

368

result->wrong_key_usage);

394

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

395

result->unsupported_algorithm);

396

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

397

result->wrong_key_usage);

369

398

if(result->file_name != NULL){

370

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

399

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

371

400

}

372

401

gpgme_recipient_t recipient;

373

402

recipient = result->recipients;

374

403

while(recipient != NULL){

375

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

376

gpgme_pubkey_algo_name(recipient->pubkey_algo));

377

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

378

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

379

recipient->status == GPG_ERR_NO_SECKEY

380

? "No" : "Yes");

404

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

405

gpgme_pubkey_algo_name

406

(recipient->pubkey_algo));

407

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

408

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

409

recipient->status == GPG_ERR_NO_SECKEY

410

? "No" : "Yes");

381

411

recipient = recipient->next;

382

412

}

383

413

}

386

416

}

387

417

388

418

if(debug){

389

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

419

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

390

420

}

391

421

392

422

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

399

429

*plaintext = NULL;

400

430

while(true){

401

431

plaintext_capacity = incbuffer(plaintext,

402

(size_t)plaintext_length,

403

plaintext_capacity);

432

(size_t)plaintext_length,

433

plaintext_capacity);

404

434

if(plaintext_capacity == 0){

405

perror_plus("incbuffer");

406

plaintext_length = -1;

407

goto decrypt_end;

435

perror_plus("incbuffer");

436

plaintext_length = -1;

437

goto decrypt_end;

408

438

}

409

439

410

440

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

423

453

}

424

454

425

455

if(debug){

426

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

456

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

427

457

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

428

458

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

429

459

}

451

481

/* GnuTLS log function callback */

452

482

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

453

483

const char* string){

454

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

484

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

455

485

}

456

486

457

487

static int init_gnutls_global(const char *pubkeyfilename,

459

489

int ret;

460

490

461

491

if(debug){

462

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

492

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

463

493

}

464

494

465

495

ret = gnutls_global_init();

466

496

if(ret != GNUTLS_E_SUCCESS){

467

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

468

safer_gnutls_strerror(ret));

497

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

498

safer_gnutls_strerror(ret));

469

499

return -1;

470

500

}

471

501

478

508

}

479

509

480

510

/* OpenPGP credentials */

481

gnutls_certificate_allocate_credentials(&mc.cred);

511

ret = gnutls_certificate_allocate_credentials(&mc.cred);

482

512

if(ret != GNUTLS_E_SUCCESS){

483

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

484

from

485

-Wunreachable-code

486

*/

487

safer_gnutls_strerror(ret));

513

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

514

safer_gnutls_strerror(ret));

488

515

gnutls_global_deinit();

489

516

return -1;

490

517

}

491

518

492

519

if(debug){

493

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

494

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

495

seckeyfilename);

520

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

521

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

522

pubkeyfilename,

523

seckeyfilename);

496

524

}

497

525

498

526

ret = gnutls_certificate_set_openpgp_key_file

499

527

(mc.cred, pubkeyfilename, seckeyfilename,

500

528

GNUTLS_OPENPGP_FMT_BASE64);

501

529

if(ret != GNUTLS_E_SUCCESS){

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));

530

fprintf_plus(stderr,

531

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

532

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

533

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

534

safer_gnutls_strerror(ret));

507

535

goto globalfail;

508

536

}

509

537

510

538

/* GnuTLS server initialization */

511

539

ret = gnutls_dh_params_init(&mc.dh_params);

512

540

if(ret != GNUTLS_E_SUCCESS){

513

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

514

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

541

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

542

" initialization: %s\n",

543

safer_gnutls_strerror(ret));

515

544

goto globalfail;

516

545

}

517

546

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

518

547

if(ret != GNUTLS_E_SUCCESS){

519

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

520

safer_gnutls_strerror(ret));

548

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

549

safer_gnutls_strerror(ret));

521

550

goto globalfail;

522

551

}

523

552

543

572

}

544

573

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

545

574

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

575

fprintf_plus(stderr,

576

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

577

safer_gnutls_strerror(ret));

548

578

}

549

579

550

580

{

557

587

}

558

588

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

559

589

if(ret != GNUTLS_E_SUCCESS){

560

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

561

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

562

safer_gnutls_strerror(ret));

590

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

591

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

592

safer_gnutls_strerror(ret));

563

593

gnutls_deinit(*session);

564

594

return -1;

565

595

}

574

604

}

575

605

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

576

606

if(ret != GNUTLS_E_SUCCESS){

577

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

578

safer_gnutls_strerror(ret));

607

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

608

safer_gnutls_strerror(ret));

579

609

gnutls_deinit(*session);

580

610

return -1;

581

611

}

626

656

pf = PF_INET;

627

657

break;

628

658

default:

629

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

659

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

630

660

errno = EINVAL;

631

661

return -1;

632

662

}

637

667

}

638

668

639

669

if(debug){

640

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

641

"\n", ip, port);

670

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

671

PRIu16 "\n", ip, port);

642

672

}

643

673

644

674

tcp_sd = socket(pf, SOCK_STREAM, 0);

670

700

}

671

701

if(ret == 0){

672

702

int e = errno;

673

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

703

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

674

704

errno = e;

675

705

goto mandos_end;

676

706

}

681

711

682

712

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

683

713

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

684

-Wunreachable-code*/

714

-Wunreachable-code*/

685

715

if(if_index == AVAHI_IF_UNSPEC){

686

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

687

" without a network interface\n");

716

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

717

" incomplete without a network interface\n");

688

718

errno = EINVAL;

689

719

goto mandos_end;

690

720

}

708

738

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

709

739

perror_plus("if_indextoname");

710

740

} else {

711

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

712

ip, interface, port);

741

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

742

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

713

743

}

714

744

} else {

715

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

716

port);

745

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

746

ip, port);

717

747

}

718

748

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

719

749

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

729

759

perror_plus("inet_ntop");

730

760

} else {

731

761

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

732

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

762

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

733

763

}

734

764

}

735

765

}

763

793

while(true){

764

794

size_t out_size = strlen(out);

765

795

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

766

out_size - written));

796

out_size - written));

767

797

if(ret == -1){

768

798

int e = errno;

769

799

perror_plus("write");

789

819

}

790

820

791

821

if(debug){

792

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

822

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

793

823

}

794

824

795

825

if(quit_now){

796

826

errno = EINTR;

797

827

goto mandos_end;

798

828

}

799

800

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

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

829

830

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

831

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

832

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

833

gnutls_transport_set_ptr(session,

834

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

802

835

803

836

if(quit_now){

804

837

errno = EINTR;

815

848

816

849

if(ret != GNUTLS_E_SUCCESS){

817

850

if(debug){

818

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

851

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

819

852

gnutls_perror(ret);

820

853

}

821

854

errno = EPROTO;

825

858

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

826

859

827

860

if(debug){

828

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

829

ip);

861

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

862

" %s\n", ip);

830

863

}

831

864

832

865

while(true){

837

870

}

838

871

839

872

buffer_capacity = incbuffer(&buffer, buffer_length,

840

buffer_capacity);

873

buffer_capacity);

841

874

if(buffer_capacity == 0){

842

875

int e = errno;

843

876

perror_plus("incbuffer");

870

903

}

871

904

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

872

905

if(ret < 0){

873

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

906

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

907

"***\n");

874

908

gnutls_perror(ret);

875

909

errno = EPROTO;

876

910

goto mandos_end;

877

911

}

878

912

break;

879

913

default:

880

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

881

" encrypted session with Mandos server\n");

914

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

915

" encrypted session with Mandos server\n");

882

916

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

917

errno = EIO;

884

918

goto mandos_end;

889

923

}

890

924

891

925

if(debug){

892

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

926

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

893

927

}

894

928

895

929

if(quit_now){

907

941

908

942

if(buffer_length > 0){

909

943

ssize_t decrypted_buffer_size;

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

944

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

912

945

&decrypted_buffer);

913

946

if(decrypted_buffer_size >= 0){

914

947

925

958

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

926

959

int e = errno;

927

960

if(debug){

928

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

929

strerror(errno));

961

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

962

strerror(errno));

930

963

}

931

964

errno = e;

932

965

goto mandos_end;

989

1022

switch(event){

990

1023

default:

991

1024

case AVAHI_RESOLVER_FAILURE:

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)));

1025

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

1026

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

1027

domain,

1028

avahi_strerror(avahi_server_errno(mc.server)));

995

1029

break;

996

1030

997

1031

case AVAHI_RESOLVER_FOUND:

999

1033

char ip[AVAHI_ADDRESS_STR_MAX];

1000

1034

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

1001

1035

if(debug){

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

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

1037

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

1038

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

1005

1039

}

1006

1040

int ret = start_mandos_communication(ip, port, interface,

1007

1041

avahi_proto_to_af(proto));

1008

1042

if(ret == 0){

1009

1043

avahi_simple_poll_quit(mc.simple_poll);

1010

1044

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1045

if(not add_server(ip, port, interface,

1046

avahi_proto_to_af(proto))){

1047

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

1048

" list\n", name);

1049

}

1013

1050

}

1014

1051

}

1015

1052

}

1039

1076

default:

1040

1077

case AVAHI_BROWSER_FAILURE:

1041

1078

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1079

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1044

1081

avahi_simple_poll_quit(mc.simple_poll);

1045

1082

return;

1046

1083

1053

1090

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

1054

1091

name, type, domain, protocol, 0,

1055

1092

resolve_callback, NULL) == NULL)

1056

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

1057

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

1093

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

1094

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1058

1096

break;

1059

1097

1060

1098

case AVAHI_BROWSER_REMOVE:

1063

1101

case AVAHI_BROWSER_ALL_FOR_NOW:

1064

1102

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1065

1103

if(debug){

1066

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

1104

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

1105

" searching...\n");

1067

1106

}

1068

1107

break;

1069

1108

}

1070

1109

}

1071

1110

1072

/* Signal handler that stops main loop after sigterm has been called */

1111

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

1073

1112

static void handle_sigterm(int sig){

1074

1113

if(quit_now){

1075

1114

return;

1084

1123

errno = old_errno;

1085

1124

}

1086

1125

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){

1140

if(debug){

1141

ret_errno = errno;

1142

perror_plus("ioctl SIOCGIFFLAGS");

1143

errno = ret_errno;

1144

}

1145

return false;

1146

}

1147

return true;

1148

}

1149

1150

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

1151

1152

/* Reject the loopback device */

1153

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(debug){

1155

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

1156

ifname);

1157

}

1158

return false;

1159

}

1160

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

1161

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

1162

if(debug){

1163

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

1164

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

1165

}

1166

return true;

1167

}

1168

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

1169

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

1170

if(debug){

1171

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1172

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

1173

}

1174

return false;

1175

}

1176

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

1177

if(ifr->ifr_flags & IFF_NOARP){

1178

if(debug){

1179

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

1180

ifname);

1181

}

1182

return false;

1183

}

1184

1185

/* Accept this device */

1186

if(debug){

1187

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

1188

}

1189

return true;

1190

}

1191

1087

1192

/*

1088

1193

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

1089

1194

* corresponds to an acceptable network device.

1090

1195

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

1091

1196

*/

1092

1197

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

1198

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

1096

1199

return 0;

1097

1200

}

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 = (sizeof(ifreq_flags)*2)+3; /* "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){

1143

if(debug){

1144

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

1145

flagstring, if_entry->d_name);

1146

}

1147

free(flagstring);

1148

return 0;

1149

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1154

if(debug){

1155

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

1156

if_entry->d_name);

1157

}

1158

return 0;

1159

}

1160

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

1161

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

1162

if(debug){

1163

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

1164

if_entry->d_name);

1165

}

1166

return 1;

1167

}

1168

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

1169

if(not (flags & IFF_BROADCAST)){

1170

if(debug){

1171

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

1172

if_entry->d_name);

1173

}

1174

return 0;

1175

}

1176

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

1177

if(flags & IFF_NOARP){

1178

if(debug){

1179

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

1180

if_entry->d_name);

1181

}

1182

return 0;

1183

}

1184

/* Accept this device */

1185

if(debug){

1186

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

1187

if_entry->d_name);

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;

1188

1213

}

1189

1214

return 1;

1190

1215

}

1191

1216

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

1192

1249

int notdotentries(const struct dirent *direntry){

1193

1250

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

1194

1251

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

1200

1257

return 1;

1201

1258

}

1202

1259

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

1203

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1204

1322

int ret;

1205

1323

struct timespec now;

1206

1324

struct timespec waited_time;

1207

1325

intmax_t block_time;

1208

1326

1209

1327

while(true){

1210

1328

if(mc.current_server == NULL){

1211

1329

if (debug){

1212

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

1330

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

1331

" No timeout!\n");

1213

1332

}

1214

1333

ret = avahi_simple_poll_iterate(s, -1);

1215

1334

} else {

1216

1335

if (debug){

1217

fprintf(stderr, "Check current_server if we should run it, or wait\n");

1336

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

1337

" it, or wait\n");

1218

1338

}

1219

1339

/* the current time */

1220

1340

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1224

1344

}

1225

1345

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

1226

1346

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

1227

waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;

1228

waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;

1229

/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */

1230

block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);

1231

1347

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1349

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1351

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

1352

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

1353

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

1354

block_time = ((retry_interval

1355

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

1356

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

1357

1232

1358

if (debug){

1233

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

1359

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

1360

block_time);

1234

1361

}

1235

1362

1236

1363

if(block_time <= 0){

1237

1364

ret = start_mandos_communication(mc.current_server->ip,

1238

mc.current_server->port,

1239

mc.current_server->if_index,

1240

mc.current_server->af);

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1241

1368

if(ret == 0){

1242

1369

avahi_simple_poll_quit(mc.simple_poll);

1243

1370

return 0;

1244

1371

}

1245

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

1372

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1246

1374

if(ret == -1){

1247

1375

perror_plus("clock_gettime");

1248

1376

return -1;

1249

1377

}

1250

1378

mc.current_server = mc.current_server->next;

1251

block_time = 0; /* call avahi to find new mandos servers, but dont block */

1379

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

1380

servers, but don't block */

1252

1381

}

1253

1382

1254

1383

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

1255

1384

}

1256

1385

if(ret != 0){

1257

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

1386

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

1258

1387

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

1259

1388

}

1260

1389

}

1261

1390

}

1262

1391

}

1263

1392

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

perror_plus("scandir");

1454

} else {

1455

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

1456

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

1457

direntry = direntries[i];

1458

char *fullname = NULL;

1459

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

1460

if(ret < 0){

1461

perror_plus("asprintf");

1462

continue;

1463

}

1464

if(debug){

1465

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

1466

direntry->d_name);

1467

}

1468

pid_t hook_pid = fork();

1469

if(hook_pid == 0){

1470

/* Child */

1471

/* Raise privileges */

1472

raise_privileges_permanently();

1473

/* Set group */

1474

errno = 0;

1475

ret = setgid(0);

1476

if(ret == -1){

1477

perror_plus("setgid");

1478

}

1479

/* Reset supplementary groups */

1480

errno = 0;

1481

ret = setgroups(0, NULL);

1482

if(ret == -1){

1483

perror_plus("setgroups");

1484

}

1485

dup2(devnull, STDIN_FILENO);

1486

close(devnull);

1487

dup2(STDERR_FILENO, STDOUT_FILENO);

1488

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

1489

if(ret == -1){

1490

perror_plus("setenv");

1491

_exit(EX_OSERR);

1492

}

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

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

1499

if(ret == -1){

1500

perror_plus("setenv");

1501

_exit(EX_OSERR);

1502

}

1503

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

1504

if(ret == -1){

1505

perror_plus("setenv");

1506

_exit(EX_OSERR);

1507

}

1508

char *delaystring;

1509

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

1510

if(ret == -1){

1511

perror_plus("asprintf");

1512

_exit(EX_OSERR);

1513

}

1514

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

1515

if(ret == -1){

1516

free(delaystring);

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1520

free(delaystring);

1521

if(connect_to != NULL){

1522

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

1523

if(ret == -1){

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

1527

}

1528

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

1529

perror_plus("execl");

1530

_exit(EXIT_FAILURE);

1531

}

1532

} else {

1533

int status;

1534

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

1535

perror_plus("waitpid");

1536

free(fullname);

1537

continue;

1538

}

1539

if(WIFEXITED(status)){

1540

if(WEXITSTATUS(status) != 0){

1541

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

1542

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

1543

WEXITSTATUS(status));

1544

free(fullname);

1545

continue;

1546

}

1547

} else if(WIFSIGNALED(status)){

1548

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

1549

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

1550

WTERMSIG(status));

1551

free(fullname);

1552

continue;

1553

} else {

1554

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

1555

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

1556

free(fullname);

1557

continue;

1558

}

1559

}

1560

free(fullname);

1561

if(debug){

1562

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

1563

direntry->d_name);

1564

}

1565

}

1566

close(devnull);

1567

}

1568

return true;

1569

}

1570

1571

error_t bring_up_interface(const char *const interface,

1572

const float delay){

1573

int sd = -1;

1574

error_t old_errno = errno;

1575

error_t ret_errno = 0;

1576

int ret, ret_setflags;

1577

struct ifreq network;

1578

unsigned int if_index = if_nametoindex(interface);

1579

if(if_index == 0){

1580

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

1581

errno = old_errno;

1582

return ENXIO;

1583

}

1584

1585

if(quit_now){

1586

errno = old_errno;

1587

return EINTR;

1588

}

1589

1590

if(not interface_is_up(interface)){

1591

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

1592

ret_errno = errno;

1593

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

1594

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

1595

return ret_errno;

1596

}

1597

network.ifr_flags |= IFF_UP;

1598

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

1601

ret_errno = errno;

1602

perror_plus("socket");

1603

errno = old_errno;

1604

return ret_errno;

1605

}

1606

1607

if(quit_now){

1608

close(sd);

1609

errno = old_errno;

1610

return EINTR;

1611

}

1612

1613

if(debug){

1614

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

1615

interface);

1616

}

1617

1618

/* Raise priviliges */

1619

raise_privileges();

1620

1621

#ifdef __linux__

1622

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1623

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

1624

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

1625

bool restore_loglevel = true;

1626

if(ret_linux == -1){

1627

restore_loglevel = false;

1628

perror_plus("klogctl");

1629

}

1630

#endif /* __linux__ */

1631

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

1632

ret_errno = errno;

1633

#ifdef __linux__

1634

if(restore_loglevel){

1635

ret_linux = klogctl(7, NULL, 0);

1636

if(ret_linux == -1){

1637

perror_plus("klogctl");

1638

}

1639

}

1640

#endif /* __linux__ */

1641

1642

/* Lower privileges */

1643

lower_privileges();

1644

1645

/* Close the socket */

1646

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

1647

if(ret == -1){

1648

perror_plus("close");

1649

}

1650

1651

if(ret_setflags == -1){

1652

errno = ret_errno;

1653

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1654

errno = old_errno;

1655

return ret_errno;

1656

}

1657

} else if(debug){

1658

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

1659

interface);

1660

}

1661

1662

/* Sleep checking until interface is running.

1663

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

1664

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

1665

if(interface_is_running(interface)){

1666

break;

1667

}

1668

struct timespec sleeptime = { .tv_nsec = 250000000 };

1669

ret = nanosleep(&sleeptime, NULL);

1670

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

1671

perror_plus("nanosleep");

1672

}

1673

}

1674

1675

errno = old_errno;

1676

return 0;

1677

}

1678

1679

error_t take_down_interface(const char *const interface){

1680

int sd = -1;

1681

error_t old_errno = errno;

1682

error_t ret_errno = 0;

1683

int ret, ret_setflags;

1684

struct ifreq network;

1685

unsigned int if_index = if_nametoindex(interface);

1686

if(if_index == 0){

1687

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

1688

errno = old_errno;

1689

return ENXIO;

1690

}

1691

if(interface_is_up(interface)){

1692

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

1693

ret_errno = errno;

1694

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

1695

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

1696

return ret_errno;

1697

}

1698

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

1699

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

1702

ret_errno = errno;

1703

perror_plus("socket");

1704

errno = old_errno;

1705

return ret_errno;

1706

}

1707

1708

if(debug){

1709

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

1710

interface);

1711

}

1712

1713

/* Raise priviliges */

1714

raise_privileges();

1715

1716

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

1717

ret_errno = errno;

1718

1719

/* Lower privileges */

1720

lower_privileges();

1721

1722

/* Close the socket */

1723

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

1724

if(ret == -1){

1725

perror_plus("close");

1726

}

1727

1728

if(ret_setflags == -1){

1729

errno = ret_errno;

1730

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1731

errno = old_errno;

1732

return ret_errno;

1733

}

1734

} else if(debug){

1735

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

1736

interface);

1737

}

1738

1739

errno = old_errno;

1740

return 0;

1741

}

1742

1264

1743

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

1265

1744

AvahiSServiceBrowser *sb = NULL;

1266

int error;

1745

error_t ret_errno;

1267

1746

int ret;

1268

1747

intmax_t tmpmax;

1269

1748

char *tmp;

1270

1749

int exitcode = EXIT_SUCCESS;

1271

const char *interface = "";

1272

struct ifreq network;

1273

int sd = -1;

1274

bool take_down_interface = false;

1275

uid_t uid;

1276

gid_t gid;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

1752

char *interfaces_to_take_down = NULL;

1753

size_t interfaces_to_take_down_size = 0;

1277

1754

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

1278

1755

bool tempdir_created = false;

1279

1756

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1280

1757

const char *seckey = PATHDIR "/" SECKEY;

1281

1758

const char *pubkey = PATHDIR "/" PUBKEY;

1759

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

1282

1761

1283

1762

bool gnutls_initialized = false;

1284

1763

bool gpgme_initialized = false;

1285

1764

float delay = 2.5f;

1286

double retry_interval = 10; /* 10s between retrying a server and checking again*/

1765

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

1766

retrying the same server again */

1287

1767

1288

1768

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1289

1769

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1345

1825

.group = 2 },

1346

1826

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

1347

1827

.arg = "SECONDS",

1348

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

1828

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

1829

.group = 2 },

1830

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

1831

.arg = "DIR",

1832

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

1349

1833

.group = 2 },

1350

1834

/*

1351

1835

* These reproduce what we would get without ARGP_NO_HELP

1370

1854

connect_to = arg;

1371

1855

break;

1372

1856

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

1373

interface = arg;

1857

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

1858

(int)',');

1859

if(ret_errno != 0){

1860

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

1861

}

1374

1862

break;

1375

1863

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

1376

1864

seckey = arg;

1400

1888

errno = 0;

1401

1889

retry_interval = strtod(arg, &tmp);

1402

1890

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

1403

or (retry_interval * 1000) > INT_MAX){

1891

or (retry_interval * 1000) > INT_MAX

1892

or retry_interval < 0){

1404

1893

argp_error(state, "Bad retry interval");

1405

1894

}

1406

1895

break;

1896

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

1897

hookdir = arg;

1898

break;

1407

1899

/*

1408

1900

* These reproduce what we would get without ARGP_NO_HELP

1409

1901

*/

1415

1907

argp_state_help(state, state->out_stream,

1416

1908

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1417

1909

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

1418

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

1910

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

1419

1911

exit(argp_err_exit_status);

1420

1912

break;

1421

1913

default:

1444

1936

goto end;

1445

1937

}

1446

1938

}

1939

1940

{

1941

/* Work around Debian bug #633582:

1942

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

1943

1944

/* Re-raise priviliges */

1945

if(raise_privileges() == 0){

1946

struct stat st;

1947

1948

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

1949

int seckey_fd = open(seckey, O_RDONLY);

1950

if(seckey_fd == -1){

1951

perror_plus("open");

1952

} else {

1953

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

1954

if(ret == -1){

1955

perror_plus("fstat");

1956

} else {

1957

if(S_ISREG(st.st_mode)

1958

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

1959

ret = fchown(seckey_fd, uid, gid);

1960

if(ret == -1){

1961

perror_plus("fchown");

1962

}

1963

}

1964

}

1965

TEMP_FAILURE_RETRY(close(seckey_fd));

1966

}

1967

}

1968

1969

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

1970

int pubkey_fd = open(pubkey, O_RDONLY);

1971

if(pubkey_fd == -1){

1972

perror_plus("open");

1973

} else {

1974

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

1975

if(ret == -1){

1976

perror_plus("fstat");

1977

} else {

1978

if(S_ISREG(st.st_mode)

1979

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

1980

ret = fchown(pubkey_fd, uid, gid);

1981

if(ret == -1){

1982

perror_plus("fchown");

1983

}

1984

}

1985

}

1986

TEMP_FAILURE_RETRY(close(pubkey_fd));

1987

}

1988

}

1989

1990

/* Lower privileges */

1991

errno = 0;

1992

ret = seteuid(uid);

1993

if(ret == -1){

1994

perror_plus("seteuid");

1995

}

1996

}

1997

}

1998

1999

/* Remove empty interface names */

2000

{

2001

char *interface = NULL;

2002

while((interface = argz_next(interfaces, interfaces_size,

2003

interface))){

2004

if(if_nametoindex(interface) == 0){

2005

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

2006

fprintf_plus(stderr, "Not using nonexisting interface"

2007

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

2008

}

2009

argz_delete(&interfaces, &interfaces_size, interface);

2010

interface = NULL;

2011

}

2012

}

2013

}

2014

2015

/* Run network hooks */

2016

{

2017

ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,

2018

interfaces, interfaces_size);

2019

if(ret_errno != 0){

2020

errno = ret_errno;

2021

perror_plus("argz_append");

2022

goto end;

2023

}

2024

argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');

2025

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

2026

goto end;

2027

}

2028

}

1447

2029

1448

2030

if(not debug){

1449

2031

avahi_set_log_function(empty_log);

1450

2032

}

1451

1452

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

1453

struct dirent **direntries;

1454

ret = scandir(sys_class_net, &direntries, good_interface,

1455

alphasort);

1456

if(ret >= 1){

1457

/* Pick the first good interface */

1458

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

1459

if(debug){

1460

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

1461

}

1462

if(interface == NULL){

1463

perror_plus("malloc");

1464

free(direntries);

1465

exitcode = EXIT_FAILURE;

1466

goto end;

1467

}

1468

free(direntries);

1469

} else {

1470

free(direntries);

1471

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

1472

exitcode = EXIT_FAILURE;

1473

goto end;

1474

}

1475

}

1476

2033

1477

2034

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

1478

2035

from the signal handler */

1480

2037

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

1481

2038

mc.simple_poll = avahi_simple_poll_new();

1482

2039

if(mc.simple_poll == NULL){

1483

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

2040

fprintf_plus(stderr,

2041

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

1484

2042

exitcode = EX_UNAVAILABLE;

1485

2043

goto end;

1486

2044

}

1548

2106

}

1549

2107

}

1550

2108

1551

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

1552

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

1553

if_index = (AvahiIfIndex) if_nametoindex(interface);

1554

if(if_index == 0){

1555

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

1556

exitcode = EX_UNAVAILABLE;

1557

goto end;

1558

}

1559

1560

if(quit_now){

1561

goto end;

1562

}

1563

1564

/* Re-raise priviliges */

1565

errno = 0;

1566

ret = seteuid(0);

1567

if(ret == -1){

1568

perror_plus("seteuid");

1569

}

1570

1571

#ifdef __linux__

1572

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1573

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

1574

ret = klogctl(8, NULL, 5);

1575

bool restore_loglevel = true;

1576

if(ret == -1){

1577

restore_loglevel = false;

1578

perror_plus("klogctl");

1579

}

1580

#endif /* __linux__ */

1581

1582

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1583

if(sd < 0){

1584

perror_plus("socket");

1585

exitcode = EX_OSERR;

1586

#ifdef __linux__

1587

if(restore_loglevel){

1588

ret = klogctl(7, NULL, 0);

1589

if(ret == -1){

1590

perror_plus("klogctl");

1591

}

1592

}

1593

#endif /* __linux__ */

1594

/* Lower privileges */

1595

errno = 0;

1596

ret = seteuid(uid);

1597

if(ret == -1){

1598

perror_plus("seteuid");

1599

}

1600

goto end;

1601

}

1602

strcpy(network.ifr_name, interface);

1603

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

1604

if(ret == -1){

1605

perror_plus("ioctl SIOCGIFFLAGS");

1606

#ifdef __linux__

1607

if(restore_loglevel){

1608

ret = klogctl(7, NULL, 0);

1609

if(ret == -1){

1610

perror_plus("klogctl");

1611

}

1612

}

1613

#endif /* __linux__ */

1614

exitcode = EX_OSERR;

1615

/* Lower privileges */

1616

errno = 0;

1617

ret = seteuid(uid);

1618

if(ret == -1){

1619

perror_plus("seteuid");

1620

}

1621

goto end;

1622

}

1623

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

1624

network.ifr_flags |= IFF_UP;

1625

take_down_interface = true;

1626

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

1627

if(ret == -1){

1628

take_down_interface = false;

1629

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1630

exitcode = EX_OSERR;

1631

#ifdef __linux__

1632

if(restore_loglevel){

1633

ret = klogctl(7, NULL, 0);

1634

if(ret == -1){

1635

perror_plus("klogctl");

1636

}

1637

}

1638

#endif /* __linux__ */

1639

/* Lower privileges */

1640

errno = 0;

1641

ret = seteuid(uid);

1642

if(ret == -1){

1643

perror_plus("seteuid");

1644

}

1645

goto end;

1646

}

1647

}

1648

/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */

1649

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

1650

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

1651

if(ret == -1){

1652

perror_plus("ioctl SIOCGIFFLAGS");

1653

} else if(network.ifr_flags & IFF_RUNNING){

1654

break;

1655

}

1656

struct timespec sleeptime = { .tv_nsec = 250000000 };

1657

ret = nanosleep(&sleeptime, NULL);

1658

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

1659

perror_plus("nanosleep");

1660

}

1661

}

1662

if(not take_down_interface){

1663

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

1664

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

1665

if(ret == -1){

1666

perror_plus("close");

1667

}

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

errno = 0;

1680

if(take_down_interface){

1681

/* Lower privileges */

1682

ret = seteuid(uid);

1683

if(ret == -1){

1684

perror_plus("seteuid");

1685

}

2109

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

2110

if(interfaces == NULL){

2111

struct dirent **direntries;

2112

/* Look for any good interfaces */

2113

ret = scandir(sys_class_net, &direntries, good_interface,

2114

alphasort);

2115

if(ret >= 1){

2116

/* Add all found interfaces to interfaces list */

2117

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

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2119

direntries[i]->d_name);

2120

if(ret_errno != 0){

2121

perror_plus("argz_add");

2122

continue;

2123

}

2124

if(debug){

2125

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

2126

direntries[i]->d_name);

2127

}

2128

}

2129

free(direntries);

1686

2130

} else {

1687

/* Lower privileges permanently */

1688

ret = setuid(uid);

1689

if(ret == -1){

1690

perror_plus("setuid");

2131

free(direntries);

2132

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

2133

exitcode = EXIT_FAILURE;

2134

goto end;

2135

}

2136

}

2137

2138

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

2139

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

2140

if(debug){

2141

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

2142

interfaces);

2143

}

2144

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2145

}

2146

2147

/* Bring up interfaces which are down */

2148

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

2149

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

2150

char *interface = NULL;

2151

while((interface = argz_next(interfaces, interfaces_size,

2152

interface))){

2153

bool interface_was_up = interface_is_up(interface);

2154

ret = bring_up_interface(interface, delay);

2155

if(not interface_was_up){

2156

if(ret != 0){

2157

errno = ret;

2158

perror_plus("Failed to bring up interface");

2159

} else {

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2163

}

1691

2164

}

1692

2165

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2169

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

2170

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

2171

}

1693

2172

}

1694

2173

1695

2174

if(quit_now){

1698

2177

1699

2178

ret = init_gnutls_global(pubkey, seckey);

1700

2179

if(ret == -1){

1701

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

2180

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

1702

2181

exitcode = EX_UNAVAILABLE;

1703

2182

goto end;

1704

2183

} else {

1720

2199

}

1721

2200

1722

2201

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

1723

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

2202

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

1724

2203

exitcode = EX_UNAVAILABLE;

1725

2204

goto end;

1726

2205

} else {

1735

2214

/* Connect directly, do not use Zeroconf */

1736

2215

/* (Mainly meant for debugging) */

1737

2216

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

2217

1738

2218

if(address == NULL){

1739

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

2219

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

1740

2220

exitcode = EX_USAGE;

1741

2221

goto end;

1742

2222

}

1750

2230

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

1751

2231

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

1752

2232

or tmpmax != (uint16_t)tmpmax){

1753

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

2233

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

1754

2234

exitcode = EX_USAGE;

1755

2235

goto end;

1756

2236

}

1761

2241

1762

2242

port = (uint16_t)tmpmax;

1763

2243

*address = '\0';

1764

address = connect_to;

1765

2244

/* Colon in address indicates IPv6 */

1766

2245

int af;

1767

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

2246

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

1768

2247

af = AF_INET6;

2248

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

2249

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

2250

{

2251

connect_to++;

2252

address[-1] = '\0';

2253

}

1769

2254

} else {

1770

2255

af = AF_INET;

1771

2256

}

2257

address = connect_to;

1772

2258

1773

2259

if(quit_now){

1774

2260

goto end;

1775

2261

}

1776

2262

1777

2263

while(not quit_now){

1778

2264

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

1779

2265

if(quit_now or ret == 0){

1780

2266

break;

1781

2267

}

1782

sleep((int)retry_interval or 1);

1783

};

1784

2268

if(debug){

2269

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

2270

(int)retry_interval);

2271

}

2272

sleep((int)retry_interval);

2273

}

2274

1785

2275

if (not quit_now){

1786

2276

exitcode = EXIT_SUCCESS;

1787

2277

}

1788

2278

1789

2279

goto end;

1790

2280

}

1791

2281

1805

2295

/* Allocate a new server */

1806

2296

mc.server = avahi_server_new(avahi_simple_poll_get

1807

2297

(mc.simple_poll), &config, NULL,

1808

NULL, &error);

2298

NULL, &ret_errno);

1809

2299

1810

2300

/* Free the Avahi configuration data */

1811

2301

avahi_server_config_free(&config);

1813

2303

1814

2304

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

1815

2305

if(mc.server == NULL){

1816

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

1817

avahi_strerror(error));

2306

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

2307

avahi_strerror(ret_errno));

1818

2308

exitcode = EX_UNAVAILABLE;

1819

2309

goto end;

1820

2310

}

1828

2318

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1829

2319

NULL, 0, browse_callback, NULL);

1830

2320

if(sb == NULL){

1831

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

1832

avahi_strerror(avahi_server_errno(mc.server)));

2321

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

2322

avahi_strerror(avahi_server_errno(mc.server)));

1833

2323

exitcode = EX_UNAVAILABLE;

1834

2324

goto end;

1835

2325

}

1841

2331

/* Run the main loop */

1842

2332

1843

2333

if(debug){

1844

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

2334

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

1845

2335

}

1846

2336

1847

ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

2338

(int)(retry_interval * 1000));

1848

2339

if(debug){

1849

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

1850

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

2340

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

2341

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

1851

2342

}

1852

2343

1853

2344

end:

1854

2345

1855

2346

if(debug){

1856

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

2347

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

1857

2348

}

1858

2349

1859

2350

/* Cleanup things */

1875

2366

if(gpgme_initialized){

1876

2367

gpgme_release(mc.ctx);

1877

2368

}

1878

1879

/* cleans up the circular linked list of mandos servers the client has seen */

2369

2370

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

2371

has seen */

1880

2372

if(mc.current_server != NULL){

1881

2373

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

1882

2374

while(mc.current_server != NULL){

1886

2378

}

1887

2379

}

1888

2380

1889

/* Take down the network interface */

1890

if(take_down_interface){

1891

/* Re-raise priviliges */

1892

errno = 0;

1893

ret = seteuid(0);

1894

if(ret == -1){

1895

perror_plus("seteuid");

1896

}

1897

if(geteuid() == 0){

1898

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

1899

if(ret == -1){

1900

perror_plus("ioctl SIOCGIFFLAGS");

1901

} else if(network.ifr_flags & IFF_UP) {

1902

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

1903

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

1904

if(ret == -1){

1905

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2381

/* Re-raise priviliges */

2382

{

2383

raise_privileges();

2384

2385

/* Run network hooks */

2386

run_network_hooks("stop", interfaces_hooks, delay);

2387

2388

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

2389

{

2390

char *interface = NULL;

2391

while((interface=argz_next(interfaces_to_take_down,

2392

interfaces_to_take_down_size,

2393

interface))){

2394

ret_errno = take_down_interface(interface);

2395

if(ret_errno != 0){

2396

errno = ret_errno;

2397

perror_plus("Failed to take down interface");

1906

2398

}

1907

2399

}

1908

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

1909

if(ret == -1){

1910

perror_plus("close");

1911

}

1912

/* Lower privileges permanently */

1913

errno = 0;

1914

ret = setuid(uid);

1915

if(ret == -1){

1916

perror_plus("setuid");

2400

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

2401

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

2402

" down\n");

1917

2403

}

1918

2404

}

2405

2406

lower_privileges_permanently();

1919

2407

}

1920

2408

2409

free(interfaces_to_take_down);

2410

free(interfaces_hooks);

2411

1921

2412

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

1922

2413

if(tempdir_created){

1923

2414

struct dirent **direntries = NULL;

1924

2415

struct dirent *direntry = NULL;

1925

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

1926

if (ret > 0){

1927

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

2416

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

2417

alphasort);

2418

if (numentries > 0){

2419

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

1928

2420

direntry = direntries[i];

1929

2421

char *fullname = NULL;

1930

2422

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

1935

2427

}

1936

2428

ret = remove(fullname);

1937

2429

if(ret == -1){

1938

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

1939

strerror(errno));

2430

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

2431

strerror(errno));

1940

2432

}

1941

2433

free(fullname);

1942

2434

}

1943

2435

}

1944

2436

1945

/* need to be cleaned even if ret == 0 because man page dont specify */

2437

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

1946

2438

free(direntries);

1947

if (ret == -1){

2439

if (numentries == -1){

1948

2440

perror_plus("scandir");

1949

2441

}

1950

2442

ret = rmdir(tempdir);