/mandos/trunk : revision 668

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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

16

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

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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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opendir(), DIR */

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

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

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inet_pton(), connect() */

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inet_pton(), connect(),

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getnameinfo() */

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

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

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

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

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

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

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

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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

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

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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161

gnutls_certificate_credentials_t cred;

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162

unsigned int dh_bits;

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164

const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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} mandos_context;

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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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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}

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

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

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va_list ap;

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va_start (ap, format);

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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));

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

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}

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/*

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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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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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if(buffer == NULL){

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

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*buffer = NULL;

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return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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}

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return buffer_capacity;

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}

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

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

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int af){

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

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int af, server **current_server){

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int ret;

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

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if(new_server == NULL){

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perror_plus("malloc");

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return -1;

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return false;

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}

213

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

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.port = port,

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.af = af };

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if(new_server->ip == NULL){

218

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perror_plus("strdup");

219

return -1;

233

return false;

234

}

235

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

236

if(ret == -1){

237

perror_plus("clock_gettime");

238

return false;

220

239

}

221

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/* Special case of first server */

222

if (mc.current_server == NULL){

241

if(*current_server == NULL){

223

242

new_server->next = new_server;

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new_server->prev = new_server;

225

mc.current_server = new_server;

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*current_server = new_server;

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245

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

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} else {

228

new_server->next = mc.current_server;

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

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new_server->next = *current_server;

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

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new_server->prev->next = new_server;

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mc.current_server->prev = new_server;

232

}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return -1;

237

}

238

return 0;

250

(*current_server)->prev = new_server;

251

}

252

return true;

239

253

}

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241

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/*

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256

* Initialize GPGME.

243

257

*/

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

245

const char *tempdir){

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const char *tempdir, mandos_context *mc){

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gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

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262

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250

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/*

251

264

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

252

265

*/

268

281

return false;

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282

}

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283

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rc = gpgme_op_import(mc.ctx, pgp_data);

284

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

272

285

if(rc != GPG_ERR_NO_ERROR){

273

286

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

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gpgme_strsource(rc), gpgme_strerror(rc));

318

331

}

319

332

320

333

/* Create new GPGME "context" */

321

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

334

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

322

335

if(rc != GPG_ERR_NO_ERROR){

323

336

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

324

337

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

339

352

*/

340

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

341

354

size_t crypto_size,

342

char **plaintext){

355

char **plaintext,

356

mandos_context *mc){

343

357

gpgme_data_t dh_crypto, dh_plain;

344

358

gpgme_error_t rc;

345

359

ssize_t ret;

371

385

372

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

373

387

data buffer */

374

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

388

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

375

389

if(rc != GPG_ERR_NO_ERROR){

376

390

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

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391

gpgme_strsource(rc), gpgme_strerror(rc));

378

392

plaintext_length = -1;

379

393

if(debug){

380

394

gpgme_decrypt_result_t result;

381

result = gpgme_op_decrypt_result(mc.ctx);

395

result = gpgme_op_decrypt_result(mc->ctx);

382

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if(result == NULL){

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

384

398

} else {

462

476

}

463

477

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static const char * safer_gnutls_strerror(int value){

465

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

466

-Wunreachable-code */

479

const char *ret = gnutls_strerror(value);

467

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if(ret == NULL)

468

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ret = "(unknown)";

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return ret;

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489

}

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491

static int init_gnutls_global(const char *pubkeyfilename,

479

const char *seckeyfilename){

492

const char *seckeyfilename,

493

mandos_context *mc){

480

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int ret;

481

495

482

496

if(debug){

499

513

}

500

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501

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/* OpenPGP credentials */

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

516

ret = gnutls_certificate_allocate_credentials(&mc->cred);

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if(ret != GNUTLS_E_SUCCESS){

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

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519

safer_gnutls_strerror(ret));

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529

}

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530

517

531

ret = gnutls_certificate_set_openpgp_key_file

518

(mc.cred, pubkeyfilename, seckeyfilename,

532

(mc->cred, pubkeyfilename, seckeyfilename,

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GNUTLS_OPENPGP_FMT_BASE64);

520

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if(ret != GNUTLS_E_SUCCESS){

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535

fprintf_plus(stderr,

527

541

}

528

542

529

543

/* GnuTLS server initialization */

530

ret = gnutls_dh_params_init(&mc.dh_params);

544

ret = gnutls_dh_params_init(&mc->dh_params);

531

545

if(ret != GNUTLS_E_SUCCESS){

532

546

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

547

" initialization: %s\n",

534

548

safer_gnutls_strerror(ret));

535

549

goto globalfail;

536

550

}

537

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

551

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

538

552

if(ret != GNUTLS_E_SUCCESS){

539

553

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

540

554

safer_gnutls_strerror(ret));

541

555

goto globalfail;

542

556

}

543

557

544

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

558

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

545

559

546

560

return 0;

547

561

548

562

globalfail:

549

563

550

gnutls_certificate_free_credentials(mc.cred);

564

gnutls_certificate_free_credentials(mc->cred);

551

565

gnutls_global_deinit();

552

gnutls_dh_params_deinit(mc.dh_params);

566

gnutls_dh_params_deinit(mc->dh_params);

553

567

return -1;

554

568

}

555

569

556

static int init_gnutls_session(gnutls_session_t *session){

570

static int init_gnutls_session(gnutls_session_t *session,

571

mandos_context *mc){

557

572

int ret;

558

573

/* GnuTLS session creation */

559

574

do {

571

586

{

572

587

const char *err;

573

588

do {

574

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

589

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

575

590

if(quit_now){

576

591

gnutls_deinit(*session);

577

592

return -1;

588

603

589

604

do {

590

605

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

591

mc.cred);

606

mc->cred);

592

607

if(quit_now){

593

608

gnutls_deinit(*session);

594

609

return -1;

604

619

/* ignore client certificate if any. */

605

620

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

606

621

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

608

623

609

624

return 0;

610

625

}

614

629

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

615

630

616

631

/* Called when a Mandos server is found */

617

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

632

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

618

633

AvahiIfIndex if_index,

619

int af){

634

int af, mandos_context *mc){

620

635

int ret, tcp_sd = -1;

621

636

ssize_t sret;

622

637

union {

652

667

return -1;

653

668

}

654

669

655

ret = init_gnutls_session(&session);

670

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

671

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

672

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

673

bool match = false;

674

{

675

char *interface = NULL;

676

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

677

interface))){

678

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

679

match = true;

680

break;

681

}

682

}

683

}

684

if(not match){

685

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

686

connect to the server */

687

if(debug){

688

char interface[IF_NAMESIZE];

689

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

690

perror_plus("if_indextoname");

691

} else {

692

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

693

" \"%s\"\n",

694

if_indextoname((unsigned int)if_index,

695

interface));

696

}

697

}

698

return -1;

699

}

700

}

701

702

ret = init_gnutls_session(&session, mc);

656

703

if(ret != 0){

657

704

return -1;

658

705

}

659

706

660

707

if(debug){

661

708

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

662

PRIu16 "\n", ip, port);

709

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

663

710

}

664

711

665

712

tcp_sd = socket(pf, SOCK_STREAM, 0);

696

743

goto mandos_end;

697

744

}

698

745

if(af == AF_INET6){

699

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

700

-Wconversion and

701

-Wunreachable-code */

702

746

to.in6.sin6_port = htons(port);

747

#ifdef __GNUC__

748

#pragma GCC diagnostic push

749

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

750

#endif

703

751

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

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

705

-Wunreachable-code*/

752

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

753

#ifdef __GNUC__

754

#pragma GCC diagnostic pop

755

#endif

706

756

if(if_index == AVAHI_IF_UNSPEC){

707

757

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

708

758

" incomplete without a network interface\n");

713

763

to.in6.sin6_scope_id = (uint32_t)if_index;

714

764

}

715

765

} else {

716

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

717

-Wconversion and

718

-Wunreachable-code */

766

to.in.sin_port = htons(port);

719

767

}

720

768

721

769

if(quit_now){

729

777

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

730

778

perror_plus("if_indextoname");

731

779

} else {

732

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

733

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

780

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

781

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

734

782

}

735

783

} else {

736

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

737

ip, port);

784

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

785

ip, (uintmax_t)port);

738

786

}

739

787

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

788

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

741

const char *pcret;

742

789

if(af == AF_INET6){

743

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

744

sizeof(addrstr));

790

ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),

791

addrstr, sizeof(addrstr), NULL, 0,

792

NI_NUMERICHOST);

745

793

} else {

746

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

747

sizeof(addrstr));

794

ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

748

797

}

749

if(pcret == NULL){

750

perror_plus("inet_ntop");

751

} else {

752

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

753

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

754

}

798

if(ret == EAI_SYSTEM){

799

perror_plus("getnameinfo");

800

} else if(ret != 0) {

801

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

802

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

803

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

755

804

}

756

805

}

757

806

818

867

goto mandos_end;

819

868

}

820

869

821

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

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

870

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

871

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

872

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

873

gnutls_transport_set_ptr(session,

874

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

823

875

824

876

if(quit_now){

825

877

errno = EINTR;

930

982

if(buffer_length > 0){

931

983

ssize_t decrypted_buffer_size;

932

984

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

933

&decrypted_buffer);

985

&decrypted_buffer, mc);

934

986

if(decrypted_buffer_size >= 0){

935

987

936

988

written = 0;

997

1049

AVAHI_GCC_UNUSED AvahiStringList *txt,

998

1050

AVAHI_GCC_UNUSED AvahiLookupResultFlags

999

1051

flags,

1000

AVAHI_GCC_UNUSED void* userdata){

1001

assert(r);

1052

void* mc){

1053

if(r == NULL){

1054

return;

1055

}

1002

1056

1003

1057

/* Called whenever a service has been resolved successfully or

1004

1058

timed out */

1013

1067

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

1014

1068

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

1015

1069

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

1070

avahi_strerror(avahi_server_errno

1071

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

1017

1072

break;

1018

1073

1019

1074

case AVAHI_RESOLVER_FOUND:

1025

1080

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

1026

1081

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

1027

1082

}

1028

int ret = start_mandos_communication(ip, port, interface,

1029

avahi_proto_to_af(proto));

1083

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

1084

interface,

1085

avahi_proto_to_af(proto),

1086

mc);

1030

1087

if(ret == 0){

1031

avahi_simple_poll_quit(mc.simple_poll);

1088

avahi_simple_poll_quit(simple_poll);

1032

1089

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

1090

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

1091

avahi_proto_to_af(proto),

1092

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

1093

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

1094

" list\n", name);

1095

}

1035

1096

}

1036

1097

}

1037

1098

}

1047

1108

const char *domain,

1048

1109

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1049

1110

flags,

1050

AVAHI_GCC_UNUSED void* userdata){

1051

assert(b);

1111

void* mc){

1112

if(b == NULL){

1113

return;

1114

}

1052

1115

1053

1116

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

1054

1117

is removed from the LAN */

1062

1125

case AVAHI_BROWSER_FAILURE:

1063

1126

1064

1127

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

1066

avahi_simple_poll_quit(mc.simple_poll);

1128

avahi_strerror(avahi_server_errno

1129

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

1130

avahi_simple_poll_quit(simple_poll);

1067

1131

return;

1068

1132

1069

1133

case AVAHI_BROWSER_NEW:

1072

1136

the callback function is called the Avahi server will free the

1073

1137

resolver for us. */

1074

1138

1075

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

1076

name, type, domain, protocol, 0,

1077

resolve_callback, NULL) == NULL)

1139

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

1140

interface, protocol, name, type,

1141

domain, protocol, 0,

1142

resolve_callback, mc) == NULL)

1078

1143

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

1079

1144

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

1145

avahi_strerror(avahi_server_errno

1146

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

1081

1147

break;

1082

1148

1083

1149

case AVAHI_BROWSER_REMOVE:

1102

1168

signal_received = sig;

1103

1169

int old_errno = errno;

1104

1170

/* set main loop to exit */

1105

if(mc.simple_poll != NULL){

1106

avahi_simple_poll_quit(mc.simple_poll);

1171

if(simple_poll != NULL){

1172

avahi_simple_poll_quit(simple_poll);

1107

1173

}

1108

1174

errno = old_errno;

1109

1175

}

1110

1176

1111

1177

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

1112

1178

int ret;

1179

error_t ret_errno;

1113

1180

1114

1181

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

1115

1182

if(s < 0){

1183

ret_errno = errno;

1116

1184

perror_plus("socket");

1185

errno = ret_errno;

1117

1186

return false;

1118

1187

}

1119

1188

strcpy(ifr->ifr_name, ifname);

1120

1189

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

1190

if(ret == -1){

1122

1191

if(debug){

1192

ret_errno = errno;

1123

1193

perror_plus("ioctl SIOCGIFFLAGS");

1194

errno = ret_errno;

1124

1195

}

1125

1196

return false;

1126

1197

}

1195

1266

}

1196

1267

1197

1268

/*

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1236

}

1237

return 1;

1269

* This function determines if a network interface is up.

1270

*/

1271

bool interface_is_up(const char *interface){

1272

struct ifreq ifr;

1273

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

1274

if(debug){

1275

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

1276

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

1277

}

1278

return false;

1279

}

1280

1281

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

1282

}

1283

1284

/*

1285

* This function determines if a network interface is running

1286

*/

1287

bool interface_is_running(const char *interface){

1288

struct ifreq ifr;

1289

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

1290

if(debug){

1291

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

1292

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

1293

}

1294

return false;

1295

}

1296

1297

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

1238

1298

}

1239

1299

1240

1300

int notdotentries(const struct dirent *direntry){

1309

1369

return 1;

1310

1370

}

1311

1371

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1372

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1373

mandos_context *mc){

1313

1374

int ret;

1314

1375

struct timespec now;

1315

1376

struct timespec waited_time;

1316

1377

intmax_t block_time;

1317

1378

1318

1379

while(true){

1319

if(mc.current_server == NULL){

1380

if(mc->current_server == NULL){

1320

1381

if (debug){

1321

1382

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

1322

1383

" No timeout!\n");

1336

1397

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

1337

1398

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

1338

1399

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1400

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

1340

1401

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1402

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

1342

1403

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

1343

1404

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

1344

1405

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

1352

1413

}

1353

1414

1354

1415

if(block_time <= 0){

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1416

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

1417

mc->current_server->port,

1418

mc->current_server->if_index,

1419

mc->current_server->af, mc);

1359

1420

if(ret == 0){

1360

avahi_simple_poll_quit(mc.simple_poll);

1421

avahi_simple_poll_quit(s);

1361

1422

return 0;

1362

1423

}

1363

1424

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1425

&mc->current_server->last_seen);

1365

1426

if(ret == -1){

1366

1427

perror_plus("clock_gettime");

1367

1428

return -1;

1368

1429

}

1369

mc.current_server = mc.current_server->next;

1430

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

1370

1431

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

1371

1432

servers, but don't block */

1372

1433

}

1381

1442

}

1382

1443

}

1383

1444

1445

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

1446

error_t raise_privileges(void){

1447

error_t old_errno = errno;

1448

error_t ret_errno = 0;

1449

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

1450

ret_errno = errno;

1451

perror_plus("seteuid");

1452

}

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

1457

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

1458

error_t raise_privileges_permanently(void){

1459

error_t old_errno = errno;

1460

error_t ret_errno = raise_privileges();

1461

if(ret_errno != 0){

1462

errno = old_errno;

1463

return ret_errno;

1464

}

1465

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

1466

ret_errno = errno;

1467

perror_plus("seteuid");

1468

}

1469

errno = old_errno;

1470

return ret_errno;

1471

}

1472

1473

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

1474

error_t lower_privileges(void){

1475

error_t old_errno = errno;

1476

error_t ret_errno = 0;

1477

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

1478

ret_errno = errno;

1479

perror_plus("seteuid");

1480

}

1481

errno = old_errno;

1482

return ret_errno;

1483

}

1484

1485

/* Lower privileges permanently */

1486

error_t lower_privileges_permanently(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("setuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1384

1497

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

1385

1498

const float delay){

1386

1499

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

1500

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

1390

1501

alphasort);

1391

1502

if(numhooks == -1){

1392

perror_plus("scandir");

1503

if(errno == ENOENT){

1504

if(debug){

1505

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

1506

" found\n", hookdir);

1507

}

1508

} else {

1509

perror_plus("scandir");

1510

}

1393

1511

} else {

1512

struct dirent *direntry;

1513

int ret;

1394

1514

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

1395

1515

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

1396

1516

direntry = direntries[i];

1408

1528

if(hook_pid == 0){

1409

1529

/* Child */

1410

1530

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1531

raise_privileges_permanently();

1422

1532

/* Set group */

1423

1533

errno = 0;

1424

1534

ret = setgid(0);

1444

1554

perror_plus("setenv");

1445

1555

_exit(EX_OSERR);

1446

1556

}

1447

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

1557

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

1448

1558

if(ret == -1){

1449

1559

perror_plus("setenv");

1450

1560

_exit(EX_OSERR);

1467

1577

_exit(EX_OSERR);

1468

1578

}

1469

1579

free(delaystring);

1470

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

1471

perror_plus("execl");

1580

if(connect_to != NULL){

1581

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

1582

if(ret == -1){

1583

perror_plus("setenv");

1584

_exit(EX_OSERR);

1585

}

1586

}

1587

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

1588

perror_plus("execl");

1589

_exit(EXIT_FAILURE);

1590

}

1472

1591

} else {

1473

1592

int status;

1474

1593

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

1508

1627

return true;

1509

1628

}

1510

1629

1630

error_t bring_up_interface(const char *const interface,

1631

const float delay){

1632

int sd = -1;

1633

error_t old_errno = errno;

1634

error_t ret_errno = 0;

1635

int ret, ret_setflags;

1636

struct ifreq network;

1637

unsigned int if_index = if_nametoindex(interface);

1638

if(if_index == 0){

1639

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

1640

errno = old_errno;

1641

return ENXIO;

1642

}

1643

1644

if(quit_now){

1645

errno = old_errno;

1646

return EINTR;

1647

}

1648

1649

if(not interface_is_up(interface)){

1650

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

1651

ret_errno = errno;

1652

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

1653

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

1654

return ret_errno;

1655

}

1656

network.ifr_flags |= IFF_UP;

1657

1658

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1659

if(sd < 0){

1660

ret_errno = errno;

1661

perror_plus("socket");

1662

errno = old_errno;

1663

return ret_errno;

1664

}

1665

1666

if(quit_now){

1667

close(sd);

1668

errno = old_errno;

1669

return EINTR;

1670

}

1671

1672

if(debug){

1673

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

1674

interface);

1675

}

1676

1677

/* Raise priviliges */

1678

raise_privileges();

1679

1680

#ifdef __linux__

1681

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1682

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

1683

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

1684

bool restore_loglevel = true;

1685

if(ret_linux == -1){

1686

restore_loglevel = false;

1687

perror_plus("klogctl");

1688

}

1689

#endif /* __linux__ */

1690

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

1691

ret_errno = errno;

1692

#ifdef __linux__

1693

if(restore_loglevel){

1694

ret_linux = klogctl(7, NULL, 0);

1695

if(ret_linux == -1){

1696

perror_plus("klogctl");

1697

}

1698

}

1699

#endif /* __linux__ */

1700

1701

/* Lower privileges */

1702

lower_privileges();

1703

1704

/* Close the socket */

1705

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

1706

if(ret == -1){

1707

perror_plus("close");

1708

}

1709

1710

if(ret_setflags == -1){

1711

errno = ret_errno;

1712

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1713

errno = old_errno;

1714

return ret_errno;

1715

}

1716

} else if(debug){

1717

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

1718

interface);

1719

}

1720

1721

/* Sleep checking until interface is running.

1722

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

1723

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

1724

if(interface_is_running(interface)){

1725

break;

1726

}

1727

struct timespec sleeptime = { .tv_nsec = 250000000 };

1728

ret = nanosleep(&sleeptime, NULL);

1729

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

1730

perror_plus("nanosleep");

1731

}

1732

}

1733

1734

errno = old_errno;

1735

return 0;

1736

}

1737

1738

error_t take_down_interface(const char *const interface){

1739

error_t old_errno = errno;

1740

struct ifreq network;

1741

unsigned int if_index = if_nametoindex(interface);

1742

if(if_index == 0){

1743

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

1744

errno = old_errno;

1745

return ENXIO;

1746

}

1747

if(interface_is_up(interface)){

1748

error_t ret_errno = 0;

1749

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

1750

ret_errno = errno;

1751

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

1752

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

1753

return ret_errno;

1754

}

1755

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

1756

1757

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

1758

if(sd < 0){

1759

ret_errno = errno;

1760

perror_plus("socket");

1761

errno = old_errno;

1762

return ret_errno;

1763

}

1764

1765

if(debug){

1766

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

1767

interface);

1768

}

1769

1770

/* Raise priviliges */

1771

raise_privileges();

1772

1773

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

1774

ret_errno = errno;

1775

1776

/* Lower privileges */

1777

lower_privileges();

1778

1779

/* Close the socket */

1780

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

1781

if(ret == -1){

1782

perror_plus("close");

1783

}

1784

1785

if(ret_setflags == -1){

1786

errno = ret_errno;

1787

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1788

errno = old_errno;

1789

return ret_errno;

1790

}

1791

} else if(debug){

1792

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

1793

interface);

1794

}

1795

1796

errno = old_errno;

1797

return 0;

1798

}

1799

1511

1800

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

1801

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

1802

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

1803

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

1804

.interfaces = NULL, .interfaces_size = 0 };

1512

1805

AvahiSServiceBrowser *sb = NULL;

1513

int error;

1806

error_t ret_errno;

1514

1807

int ret;

1515

1808

intmax_t tmpmax;

1516

1809

char *tmp;

1517

1810

int exitcode = EXIT_SUCCESS;

1518

const char *interface = "";

1519

struct ifreq network;

1520

int sd = -1;

1521

bool take_down_interface = false;

1522

uid_t uid;

1523

gid_t gid;

1811

char *interfaces_to_take_down = NULL;

1812

size_t interfaces_to_take_down_size = 0;

1524

1813

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

1525

1814

bool tempdir_created = false;

1526

1815

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1527

1816

const char *seckey = PATHDIR "/" SECKEY;

1528

1817

const char *pubkey = PATHDIR "/" PUBKEY;

1818

char *interfaces_hooks = NULL;

1529

1819

1530

1820

bool gnutls_initialized = false;

1531

1821

bool gpgme_initialized = false;

1593

1883

.group = 2 },

1594

1884

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

1595

1885

.arg = "SECONDS",

1596

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

1886

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

1597

1887

.group = 2 },

1598

1888

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

1599

1889

.arg = "DIR",

1622

1912

connect_to = arg;

1623

1913

break;

1624

1914

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

1625

interface = arg;

1915

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

1916

arg, (int)',');

1917

if(ret_errno != 0){

1918

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

1919

}

1626

1920

break;

1627

1921

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

1628

1922

seckey = arg;

1671

1965

argp_state_help(state, state->out_stream,

1672

1966

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

1967

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

1968

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

1677

1969

exit(argp_err_exit_status);

1678

1970

break;

1708

2000

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

1709

2001

1710

2002

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

1715

} else {

2003

if(raise_privileges() == 0){

1716

2004

struct stat st;

1717

2005

1718

2006

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

1758

2046

}

1759

2047

1760

2048

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

2049

lower_privileges();

2050

}

2051

}

2052

2053

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

2054

{

2055

char *interface = NULL;

2056

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

2057

interface))){

2058

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

2059

and if_nametoindex(interface) == 0){

2060

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

2061

fprintf_plus(stderr, "Not using nonexisting interface"

2062

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

2063

}

2064

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

2065

interface = NULL;

1765

2066

}

1766

2067

}

1767

2068

}

1768

2069

1769

2070

/* Run network hooks */

1770

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

1771

goto end;

2071

{

2072

if(mc.interfaces != NULL){

2073

interfaces_hooks = malloc(mc.interfaces_size);

2074

if(interfaces_hooks == NULL){

2075

perror_plus("malloc");

2076

goto end;

2077

}

2078

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

2079

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

2080

}

2081

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

2082

interfaces_hooks : "", delay)){

2083

goto end;

2084

}

1772

2085

}

1773

2086

1774

2087

if(not debug){

1775

2088

avahi_set_log_function(empty_log);

1776

2089

}

1777

2090

1778

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

1779

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

if(ret >= 1){

1790

/* Pick the first interface returned */

1791

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

1792

if(debug){

1793

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

1794

}

1795

if(interface == NULL){

1796

perror_plus("malloc");

1797

free(direntries);

1798

exitcode = EXIT_FAILURE;

1799

goto end;

1800

}

1801

free(direntries);

1802

} else {

1803

free(direntries);

1804

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

1805

exitcode = EXIT_FAILURE;

1806

goto end;

1807

}

1808

}

1809

1810

2091

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

1811

2092

from the signal handler */

1812

2093

/* Initialize the pseudo-RNG for Avahi */

1813

2094

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

1814

mc.simple_poll = avahi_simple_poll_new();

1815

if(mc.simple_poll == NULL){

2095

simple_poll = avahi_simple_poll_new();

2096

if(simple_poll == NULL){

1816

2097

fprintf_plus(stderr,

1817

2098

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

1818

2099

exitcode = EX_UNAVAILABLE;

1882

2163

}

1883

2164

}

1884

2165

1885

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

1886

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

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1888

if(if_index == 0){

1889

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

1890

exitcode = EX_UNAVAILABLE;

1891

goto end;

1892

}

1893

1894

if(quit_now){

1895

goto end;

1896

}

1897

1898

/* Re-raise priviliges */

1899

errno = 0;

1900

ret = seteuid(0);

1901

if(ret == -1){

1902

perror_plus("seteuid");

1903

}

1904

1905

#ifdef __linux__

1906

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1907

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

1908

ret = klogctl(8, NULL, 5);

1909

bool restore_loglevel = true;

1910

if(ret == -1){

1911

restore_loglevel = false;

1912

perror_plus("klogctl");

1913

}

1914

#endif /* __linux__ */

1915

1916

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1917

if(sd < 0){

1918

perror_plus("socket");

1919

exitcode = EX_OSERR;

1920

#ifdef __linux__

1921

if(restore_loglevel){

1922

ret = klogctl(7, NULL, 0);

1923

if(ret == -1){

1924

perror_plus("klogctl");

1925

}

1926

}

1927

#endif /* __linux__ */

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1934

goto end;

1935

}

1936

strcpy(network.ifr_name, interface);

1937

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

1938

if(ret == -1){

1939

perror_plus("ioctl SIOCGIFFLAGS");

1940

#ifdef __linux__

1941

if(restore_loglevel){

1942

ret = klogctl(7, NULL, 0);

1943

if(ret == -1){

1944

perror_plus("klogctl");

1945

}

1946

}

1947

#endif /* __linux__ */

1948

exitcode = EX_OSERR;

1949

/* Lower privileges */

1950

errno = 0;

1951

ret = seteuid(uid);

1952

if(ret == -1){

1953

perror_plus("seteuid");

1954

}

1955

goto end;

1956

}

1957

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

1958

network.ifr_flags |= IFF_UP;

1959

take_down_interface = true;

1960

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

1961

if(ret == -1){

1962

take_down_interface = false;

1963

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1964

exitcode = EX_OSERR;

1965

#ifdef __linux__

1966

if(restore_loglevel){

1967

ret = klogctl(7, NULL, 0);

1968

if(ret == -1){

1969

perror_plus("klogctl");

2166

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

2167

if(mc.interfaces == NULL){

2168

struct dirent **direntries;

2169

/* Look for any good interfaces */

2170

ret = scandir(sys_class_net, &direntries, good_interface,

2171

alphasort);

2172

if(ret >= 1){

2173

/* Add all found interfaces to interfaces list */

2174

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

2175

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

2176

direntries[i]->d_name);

2177

if(ret_errno != 0){

2178

errno = ret_errno;

2179

perror_plus("argz_add");

2180

continue;

2181

}

2182

if(debug){

2183

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

2184

direntries[i]->d_name);

2185

}

2186

}

2187

free(direntries);

2188

} else {

2189

free(direntries);

2190

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

2191

exitcode = EXIT_FAILURE;

2192

goto end;

2193

}

2194

}

2195

2196

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

2197

{

2198

char *interface = NULL;

2199

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

2200

interface))){

2201

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

2202

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

2203

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

2204

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

2205

interface);

2206

interface = NULL;

2207

while((interface = argz_next(mc.interfaces,

2208

mc.interfaces_size, interface))){

2209

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

2210

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

2211

interface);

2212

interface = NULL;

1970

2213

}

1971

2214

}

1972

#endif /* __linux__ */

1973

/* Lower privileges */

1974

errno = 0;

1975

ret = seteuid(uid);

1976

if(ret == -1){

1977

perror_plus("seteuid");

1978

}

1979

goto end;

1980

}

1981

}

1982

/* Sleep checking until interface is running.

1983

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

1984

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

1985

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

1986

if(ret == -1){

1987

perror_plus("ioctl SIOCGIFFLAGS");

1988

} else if(network.ifr_flags & IFF_RUNNING){

1989

2215

break;

1990

2216

}

1991

struct timespec sleeptime = { .tv_nsec = 250000000 };

1992

ret = nanosleep(&sleeptime, NULL);

1993

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

1994

perror_plus("nanosleep");

1995

}

1996

}

1997

if(not take_down_interface){

1998

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

1999

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

2000

if(ret == -1){

2001

perror_plus("close");

2002

}

2003

}

2004

#ifdef __linux__

2005

if(restore_loglevel){

2006

/* Restores kernel loglevel to default */

2007

ret = klogctl(7, NULL, 0);

2008

if(ret == -1){

2009

perror_plus("klogctl");

2010

}

2011

}

2012

#endif /* __linux__ */

2013

/* Lower privileges */

2014

errno = 0;

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

2019

}

2217

bool interface_was_up = interface_is_up(interface);

2218

ret = bring_up_interface(interface, delay);

2219

if(not interface_was_up){

2220

if(ret != 0){

2221

errno = ret;

2222

perror_plus("Failed to bring up interface");

2223

} else {

2224

ret_errno = argz_add(&interfaces_to_take_down,

2225

&interfaces_to_take_down_size,

2226

interface);

2227

if(ret_errno != 0){

2228

errno = ret_errno;

2229

perror_plus("argz_add");

2230

}

2231

}

2232

}

2233

}

2234

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

2235

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

2236

}

2237

}

2238

2239

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

2240

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

2241

if(debug){

2242

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

2243

mc.interfaces);

2244

}

2245

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

2020

2246

}

2021

2247

2022

2248

if(quit_now){

2023

2249

goto end;

2024

2250

}

2025

2251

2026

ret = init_gnutls_global(pubkey, seckey);

2252

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

2027

2253

if(ret == -1){

2028

2254

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

2029

2255

exitcode = EX_UNAVAILABLE;

2046

2272

goto end;

2047

2273

}

2048

2274

2049

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

2275

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

2050

2276

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

2051

2277

exitcode = EX_UNAVAILABLE;

2052

2278

goto end;

2062

2288

/* Connect directly, do not use Zeroconf */

2063

2289

/* (Mainly meant for debugging) */

2064

2290

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

2291

2065

2292

if(address == NULL){

2066

2293

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

2067

2294

exitcode = EX_USAGE;

2072

2299

goto end;

2073

2300

}

2074

2301

2075

uint16_t port;

2302

in_port_t port;

2076

2303

errno = 0;

2077

2304

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

2078

2305

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

2079

or tmpmax != (uint16_t)tmpmax){

2306

or tmpmax != (in_port_t)tmpmax){

2080

2307

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

2081

2308

exitcode = EX_USAGE;

2082

2309

goto end;

2083

2310

}

2084

2311

2085

2312

if(quit_now){

2086

2313

goto end;

2087

2314

}

2088

2315

2089

port = (uint16_t)tmpmax;

2316

port = (in_port_t)tmpmax;

2090

2317

*address = '\0';

2091

2318

/* Colon in address indicates IPv6 */

2092

2319

int af;

2108

2335

}

2109

2336

2110

2337

while(not quit_now){

2111

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

2338

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

2339

&mc);

2112

2340

if(quit_now or ret == 0){

2113

2341

break;

2114

2342

}

2116

2344

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

2117

2345

(int)retry_interval);

2118

2346

}

2119

sleep((int)retry_interval);

2347

sleep((unsigned int)retry_interval);

2120

2348

}

2121

2349

2122

2350

if (not quit_now){

2140

2368

config.publish_domain = 0;

2141

2369

2142

2370

/* Allocate a new server */

2143

mc.server = avahi_server_new(avahi_simple_poll_get

2144

(mc.simple_poll), &config, NULL,

2145

NULL, &error);

2371

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2372

&config, NULL, NULL, &ret_errno);

2146

2373

2147

2374

/* Free the Avahi configuration data */

2148

2375

avahi_server_config_free(&config);

2151

2378

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

2152

2379

if(mc.server == NULL){

2153

2380

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

2154

avahi_strerror(error));

2381

avahi_strerror(ret_errno));

2155

2382

exitcode = EX_UNAVAILABLE;

2156

2383

goto end;

2157

2384

}

2163

2390

/* Create the Avahi service browser */

2164

2391

sb = avahi_s_service_browser_new(mc.server, if_index,

2165

2392

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2166

NULL, 0, browse_callback, NULL);

2393

NULL, 0, browse_callback,

2394

(void *)&mc);

2167

2395

if(sb == NULL){

2168

2396

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

2169

2397

avahi_strerror(avahi_server_errno(mc.server)));

2181

2409

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

2182

2410

}

2183

2411

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2412

ret = avahi_loop_with_timeout(simple_poll,

2413

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

2186

2414

if(debug){

2187

2415

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

2188

2416

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

2195

2423

}

2196

2424

2197

2425

/* Cleanup things */

2426

free(mc.interfaces);

2427

2198

2428

if(sb != NULL)

2199

2429

avahi_s_service_browser_free(sb);

2200

2430

2201

2431

if(mc.server != NULL)

2202

2432

avahi_server_free(mc.server);

2203

2433

2204

if(mc.simple_poll != NULL)

2205

avahi_simple_poll_free(mc.simple_poll);

2434

if(simple_poll != NULL)

2435

avahi_simple_poll_free(simple_poll);

2206

2436

2207

2437

if(gnutls_initialized){

2208

2438

gnutls_certificate_free_credentials(mc.cred);

2225

2455

}

2226

2456

}

2227

2457

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

2458

/* Re-raise priviliges */

2232

2459

{

2233

errno = 0;

2234

ret = seteuid(0);

2235

if(ret == -1){

2236

perror_plus("seteuid");

2237

}

2238

2239

/* Take down the network interface */

2240

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

2241

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

2242

if(ret == -1){

2243

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

2245

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

2246

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

2247

if(ret == -1){

2248

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2460

raise_privileges();

2461

2462

/* Run network hooks */

2463

run_network_hooks("stop", interfaces_hooks != NULL ?

2464

interfaces_hooks : "", delay);

2465

2466

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

2467

{

2468

char *interface = NULL;

2469

while((interface=argz_next(interfaces_to_take_down,

2470

interfaces_to_take_down_size,

2471

interface))){

2472

ret_errno = take_down_interface(interface);

2473

if(ret_errno != 0){

2474

errno = ret_errno;

2475

perror_plus("Failed to take down interface");

2249

2476

}

2250

2477

}

2251

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

2252

if(ret == -1){

2253

perror_plus("close");

2478

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

2479

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

2480

" down\n");

2254

2481

}

2255

2482

}

2256

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2483

2484

lower_privileges_permanently();

2485

}

2486

2487

free(interfaces_to_take_down);

2488

free(interfaces_hooks);

2263

2489

2264

2490

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

2265

2491

if(tempdir_created){