/mandos/trunk : revision 667

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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() */

44

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

44

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

45

#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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60

#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;

137

143

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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157

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

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typedef struct {

152

AvahiSimplePoll *simple_poll;

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AvahiServer *server;

154

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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165

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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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){

198

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

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int af){

219

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

220

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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return false;

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234

}

224

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/* Special case of first server */

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if (mc.current_server == NULL){

236

if(*current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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*current_server = new_server;

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

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} else {

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new_server->next = mc.current_server;

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

242

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;

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(*current_server)->prev = new_server;

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}

236

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

247

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

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if(ret == -1){

238

249

perror_plus("clock_gettime");

239

250

return false;

245

256

* Initialize GPGME.

246

257

*/

247

258

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

248

const char *tempdir){

259

const char *tempdir, mandos_context *mc){

249

260

gpgme_error_t rc;

250

261

gpgme_engine_info_t engine_info;

251

262

252

253

263

/*

254

264

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

255

265

*/

271

281

return false;

272

282

}

273

283

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rc = gpgme_op_import(mc.ctx, pgp_data);

284

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

275

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if(rc != GPG_ERR_NO_ERROR){

276

286

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

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gpgme_strsource(rc), gpgme_strerror(rc));

321

331

}

322

332

323

333

/* Create new GPGME "context" */

324

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

334

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

325

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if(rc != GPG_ERR_NO_ERROR){

326

336

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

327

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

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352

*/

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static ssize_t pgp_packet_decrypt(const char *cryptotext,

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size_t crypto_size,

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char **plaintext){

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char **plaintext,

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mandos_context *mc){

346

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gpgme_data_t dh_crypto, dh_plain;

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gpgme_error_t rc;

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ssize_t ret;

374

385

375

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

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data buffer */

377

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

388

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

378

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if(rc != GPG_ERR_NO_ERROR){

379

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

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391

gpgme_strsource(rc), gpgme_strerror(rc));

381

392

plaintext_length = -1;

382

393

if(debug){

383

394

gpgme_decrypt_result_t result;

384

result = gpgme_op_decrypt_result(mc.ctx);

395

result = gpgme_op_decrypt_result(mc->ctx);

385

396

if(result == NULL){

386

397

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

387

398

} else {

465

476

}

466

477

467

478

static const char * safer_gnutls_strerror(int value){

468

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

469

-Wunreachable-code */

479

const char *ret = gnutls_strerror(value);

470

480

if(ret == NULL)

471

481

ret = "(unknown)";

472

482

return ret;

479

489

}

480

490

481

491

static int init_gnutls_global(const char *pubkeyfilename,

482

const char *seckeyfilename){

492

const char *seckeyfilename,

493

mandos_context *mc){

483

494

int ret;

484

495

485

496

if(debug){

502

513

}

503

514

504

515

/* OpenPGP credentials */

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

516

ret = gnutls_certificate_allocate_credentials(&mc->cred);

506

517

if(ret != GNUTLS_E_SUCCESS){

507

518

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

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519

safer_gnutls_strerror(ret));

518

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}

519

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520

531

ret = gnutls_certificate_set_openpgp_key_file

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(mc.cred, pubkeyfilename, seckeyfilename,

532

(mc->cred, pubkeyfilename, seckeyfilename,

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GNUTLS_OPENPGP_FMT_BASE64);

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if(ret != GNUTLS_E_SUCCESS){

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535

fprintf_plus(stderr,

530

541

}

531

542

532

543

/* GnuTLS server initialization */

533

ret = gnutls_dh_params_init(&mc.dh_params);

544

ret = gnutls_dh_params_init(&mc->dh_params);

534

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if(ret != GNUTLS_E_SUCCESS){

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546

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

547

" initialization: %s\n",

537

548

safer_gnutls_strerror(ret));

538

549

goto globalfail;

539

550

}

540

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

551

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

541

552

if(ret != GNUTLS_E_SUCCESS){

542

553

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

543

554

safer_gnutls_strerror(ret));

544

555

goto globalfail;

545

556

}

546

557

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

558

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

548

559

549

560

return 0;

550

561

551

562

globalfail:

552

563

553

gnutls_certificate_free_credentials(mc.cred);

564

gnutls_certificate_free_credentials(mc->cred);

554

565

gnutls_global_deinit();

555

gnutls_dh_params_deinit(mc.dh_params);

566

gnutls_dh_params_deinit(mc->dh_params);

556

567

return -1;

557

568

}

558

569

559

static int init_gnutls_session(gnutls_session_t *session){

570

static int init_gnutls_session(gnutls_session_t *session,

571

mandos_context *mc){

560

572

int ret;

561

573

/* GnuTLS session creation */

562

574

do {

574

586

{

575

587

const char *err;

576

588

do {

577

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

589

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

578

590

if(quit_now){

579

591

gnutls_deinit(*session);

580

592

return -1;

591

603

592

604

do {

593

605

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

594

mc.cred);

606

mc->cred);

595

607

if(quit_now){

596

608

gnutls_deinit(*session);

597

609

return -1;

607

619

/* ignore client certificate if any. */

608

620

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

609

621

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

611

623

612

624

return 0;

613

625

}

617

629

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

618

630

619

631

/* Called when a Mandos server is found */

620

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

632

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

621

633

AvahiIfIndex if_index,

622

int af){

634

int af, mandos_context *mc){

623

635

int ret, tcp_sd = -1;

624

636

ssize_t sret;

625

637

union {

655

667

return -1;

656

668

}

657

669

658

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);

659

703

if(ret != 0){

660

704

return -1;

661

705

}

662

706

663

707

if(debug){

664

708

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

665

PRIu16 "\n", ip, port);

709

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

666

710

}

667

711

668

712

tcp_sd = socket(pf, SOCK_STREAM, 0);

699

743

goto mandos_end;

700

744

}

701

745

if(af == AF_INET6){

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

746

to.in6.sin6_port = htons(port);

747

#ifdef __GNUC__

748

#pragma GCC diagnostic push

749

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

750

#endif

706

751

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

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

708

-Wunreachable-code*/

752

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

753

#ifdef __GNUC__

754

#pragma GCC diagnostic pop

755

#endif

709

756

if(if_index == AVAHI_IF_UNSPEC){

710

757

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

711

758

" incomplete without a network interface\n");

716

763

to.in6.sin6_scope_id = (uint32_t)if_index;

717

764

}

718

765

} else {

719

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

720

-Wconversion and

721

-Wunreachable-code */

766

to.in.sin_port = htons(port);

722

767

}

723

768

724

769

if(quit_now){

732

777

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

733

778

perror_plus("if_indextoname");

734

779

} else {

735

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

736

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

780

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

781

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

737

782

}

738

783

} else {

739

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

740

ip, port);

784

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

785

ip, (uintmax_t)port);

741

786

}

742

787

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

788

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

744

const char *pcret;

745

789

if(af == AF_INET6){

746

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

747

sizeof(addrstr));

790

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

791

addrstr, sizeof(addrstr), NULL, 0,

792

NI_NUMERICHOST);

748

793

} else {

749

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

750

sizeof(addrstr));

794

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

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

751

797

}

752

if(pcret == NULL){

753

perror_plus("inet_ntop");

754

} else {

755

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

756

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

757

}

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);

758

804

}

759

805

}

760

806

821

867

goto mandos_end;

822

868

}

823

869

824

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

825

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);

826

875

827

876

if(quit_now){

828

877

errno = EINTR;

933

982

if(buffer_length > 0){

934

983

ssize_t decrypted_buffer_size;

935

984

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

936

&decrypted_buffer);

985

&decrypted_buffer, mc);

937

986

if(decrypted_buffer_size >= 0){

938

987

939

988

written = 0;

1000

1049

AVAHI_GCC_UNUSED AvahiStringList *txt,

1001

1050

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1002

1051

flags,

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1052

void* mc){

1053

if(r == NULL){

1054

return;

1055

}

1005

1056

1006

1057

/* Called whenever a service has been resolved successfully or

1007

1058

timed out */

1016

1067

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

1017

1068

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

1018

1069

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

1070

avahi_strerror(avahi_server_errno

1071

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

1020

1072

break;

1021

1073

1022

1074

case AVAHI_RESOLVER_FOUND:

1028

1080

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

1029

1081

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

1030

1082

}

1031

int ret = start_mandos_communication(ip, port, interface,

1032

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);

1033

1087

if(ret == 0){

1034

avahi_simple_poll_quit(mc.simple_poll);

1088

avahi_simple_poll_quit(simple_poll);

1035

1089

} else {

1036

if(not add_server(ip, port, interface,

1037

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)){

1038

1093

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

1039

1094

" list\n", name);

1040

1095

}

1053

1108

const char *domain,

1054

1109

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1055

1110

flags,

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1111

void* mc){

1112

if(b == NULL){

1113

return;

1114

}

1058

1115

1059

1116

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

1060

1117

is removed from the LAN */

1068

1125

case AVAHI_BROWSER_FAILURE:

1069

1126

1070

1127

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

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);

1073

1131

return;

1074

1132

1075

1133

case AVAHI_BROWSER_NEW:

1078

1136

the callback function is called the Avahi server will free the

1079

1137

resolver for us. */

1080

1138

1081

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

1082

name, type, domain, protocol, 0,

1083

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)

1084

1143

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

1085

1144

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

1145

avahi_strerror(avahi_server_errno

1146

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

1087

1147

break;

1088

1148

1089

1149

case AVAHI_BROWSER_REMOVE:

1108

1168

signal_received = sig;

1109

1169

int old_errno = errno;

1110

1170

/* set main loop to exit */

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1171

if(simple_poll != NULL){

1172

avahi_simple_poll_quit(simple_poll);

1113

1173

}

1114

1174

errno = old_errno;

1115

1175

}

1116

1176

1117

1177

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

1118

1178

int ret;

1179

error_t ret_errno;

1119

1180

1120

1181

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

1121

1182

if(s < 0){

1183

ret_errno = errno;

1122

1184

perror_plus("socket");

1185

errno = ret_errno;

1123

1186

return false;

1124

1187

}

1125

1188

strcpy(ifr->ifr_name, ifname);

1126

1189

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

1190

if(ret == -1){

1128

1191

if(debug){

1192

ret_errno = errno;

1129

1193

perror_plus("ioctl SIOCGIFFLAGS");

1194

errno = ret_errno;

1130

1195

}

1131

1196

return false;

1132

1197

}

1201

1266

}

1202

1267

1203

1268

/*

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

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);

1244

1298

}

1245

1299

1246

1300

int notdotentries(const struct dirent *direntry){

1315

1369

return 1;

1316

1370

}

1317

1371

1318

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){

1319

1374

int ret;

1320

1375

struct timespec now;

1321

1376

struct timespec waited_time;

1322

1377

intmax_t block_time;

1323

1378

1324

1379

while(true){

1325

if(mc.current_server == NULL){

1380

if(mc->current_server == NULL){

1326

1381

if (debug){

1327

1382

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

1328

1383

" No timeout!\n");

1342

1397

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

1343

1398

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

1344

1399

waited_time.tv_sec = (now.tv_sec

1345

- mc.current_server->last_seen.tv_sec);

1400

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

1346

1401

waited_time.tv_nsec = (now.tv_nsec

1347

- mc.current_server->last_seen.tv_nsec);

1402

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

1348

1403

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

1349

1404

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

1350

1405

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

1358

1413

}

1359

1414

1360

1415

if(block_time <= 0){

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

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);

1365

1420

if(ret == 0){

1366

avahi_simple_poll_quit(mc.simple_poll);

1421

avahi_simple_poll_quit(s);

1367

1422

return 0;

1368

1423

}

1369

1424

ret = clock_gettime(CLOCK_MONOTONIC,

1370

&mc.current_server->last_seen);

1425

&mc->current_server->last_seen);

1371

1426

if(ret == -1){

1372

1427

perror_plus("clock_gettime");

1373

1428

return -1;

1374

1429

}

1375

mc.current_server = mc.current_server->next;

1430

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

1376

1431

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

1377

1432

servers, but don't block */

1378

1433

}

1387

1442

}

1388

1443

}

1389

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

1390

1497

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

1391

1498

const float delay){

1392

1499

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

1500

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

1396

1501

alphasort);

1397

1502

if(numhooks == -1){

1398

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

}

1399

1511

} else {

1512

struct dirent *direntry;

1513

int ret;

1400

1514

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

1401

1515

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

1402

1516

direntry = direntries[i];

1414

1528

if(hook_pid == 0){

1415

1529

/* Child */

1416

1530

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1531

raise_privileges_permanently();

1428

1532

/* Set group */

1429

1533

errno = 0;

1430

1534

ret = setgid(0);

1450

1554

perror_plus("setenv");

1451

1555

_exit(EX_OSERR);

1452

1556

}

1453

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

1557

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

1454

1558

if(ret == -1){

1455

1559

perror_plus("setenv");

1456

1560

_exit(EX_OSERR);

1473

1577

_exit(EX_OSERR);

1474

1578

}

1475

1579

free(delaystring);

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

}

1476

1587

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

1477

1588

perror_plus("execl");

1478

1589

_exit(EXIT_FAILURE);

1516

1627

return true;

1517

1628

}

1518

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

1519

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 };

1520

1805

AvahiSServiceBrowser *sb = NULL;

1521

int error;

1806

error_t ret_errno;

1522

1807

int ret;

1523

1808

intmax_t tmpmax;

1524

1809

char *tmp;

1525

1810

int exitcode = EXIT_SUCCESS;

1526

const char *interface = "";

1527

struct ifreq network;

1528

int sd = -1;

1529

bool take_down_interface = false;

1530

uid_t uid;

1531

gid_t gid;

1811

char *interfaces_to_take_down = NULL;

1812

size_t interfaces_to_take_down_size = 0;

1532

1813

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

1533

1814

bool tempdir_created = false;

1534

1815

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1535

1816

const char *seckey = PATHDIR "/" SECKEY;

1536

1817

const char *pubkey = PATHDIR "/" PUBKEY;

1818

char *interfaces_hooks = NULL;

1537

1819

1538

1820

bool gnutls_initialized = false;

1539

1821

bool gpgme_initialized = false;

1601

1883

.group = 2 },

1602

1884

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

1603

1885

.arg = "SECONDS",

1604

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

1886

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

1605

1887

.group = 2 },

1606

1888

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

1607

1889

.arg = "DIR",

1630

1912

connect_to = arg;

1631

1913

break;

1632

1914

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

1633

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

}

1634

1920

break;

1635

1921

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

1636

1922

seckey = arg;

1714

2000

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

1715

2001

1716

2002

/* Re-raise priviliges */

1717

errno = 0;

1718

ret = seteuid(0);

1719

if(ret == -1){

1720

perror_plus("seteuid");

1721

} else {

2003

if(raise_privileges() == 0){

1722

2004

struct stat st;

1723

2005

1724

2006

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

1764

2046

}

1765

2047

1766

2048

/* Lower privileges */

1767

errno = 0;

1768

ret = seteuid(uid);

1769

if(ret == -1){

1770

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;

1771

2066

}

1772

2067

}

1773

2068

}

1774

2069

1775

2070

/* Run network hooks */

1776

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

1777

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

}

1778

2085

}

1779

2086

1780

2087

if(not debug){

1781

2088

avahi_set_log_function(empty_log);

1782

2089

}

1783

2090

1784

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

1785

struct dirent **direntries;

1786

/* First look for interfaces that are up */

1787

ret = scandir(sys_class_net, &direntries, up_interface,

1788

alphasort);

1789

if(ret == 0){

1790

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

1791

free(direntries);

1792

ret = scandir(sys_class_net, &direntries, good_interface,

1793

alphasort);

1794

}

1795

if(ret >= 1){

1796

/* Pick the first interface returned */

1797

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

1798

if(debug){

1799

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

1800

}

1801

if(interface == NULL){

1802

perror_plus("malloc");

1803

free(direntries);

1804

exitcode = EXIT_FAILURE;

1805

goto end;

1806

}

1807

free(direntries);

1808

} else {

1809

free(direntries);

1810

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

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

}

1815

1816

2091

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

1817

2092

from the signal handler */

1818

2093

/* Initialize the pseudo-RNG for Avahi */

1819

2094

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

1820

mc.simple_poll = avahi_simple_poll_new();

1821

if(mc.simple_poll == NULL){

2095

simple_poll = avahi_simple_poll_new();

2096

if(simple_poll == NULL){

1822

2097

fprintf_plus(stderr,

1823

2098

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

1824

2099

exitcode = EX_UNAVAILABLE;

1888

2163

}

1889

2164

}

1890

2165

1891

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

1892

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

1893

if_index = (AvahiIfIndex) if_nametoindex(interface);

1894

if(if_index == 0){

1895

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

1896

exitcode = EX_UNAVAILABLE;

1897

goto end;

1898

}

1899

1900

if(quit_now){

1901

goto end;

1902

}

1903

1904

/* Re-raise priviliges */

1905

errno = 0;

1906

ret = seteuid(0);

1907

if(ret == -1){

1908

perror_plus("seteuid");

1909

}

1910

1911

#ifdef __linux__

1912

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1913

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

1914

ret = klogctl(8, NULL, 5);

1915

bool restore_loglevel = true;

1916

if(ret == -1){

1917

restore_loglevel = false;

1918

perror_plus("klogctl");

1919

}

1920

#endif /* __linux__ */

1921

1922

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1923

if(sd < 0){

1924

perror_plus("socket");

1925

exitcode = EX_OSERR;

1926

#ifdef __linux__

1927

if(restore_loglevel){

1928

ret = klogctl(7, NULL, 0);

1929

if(ret == -1){

1930

perror_plus("klogctl");

1931

}

1932

}

1933

#endif /* __linux__ */

1934

/* Lower privileges */

1935

errno = 0;

1936

ret = seteuid(uid);

1937

if(ret == -1){

1938

perror_plus("seteuid");

1939

}

1940

goto end;

1941

}

1942

strcpy(network.ifr_name, interface);

1943

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

1944

if(ret == -1){

1945

perror_plus("ioctl SIOCGIFFLAGS");

1946

#ifdef __linux__

1947

if(restore_loglevel){

1948

ret = klogctl(7, NULL, 0);

1949

if(ret == -1){

1950

perror_plus("klogctl");

1951

}

1952

}

1953

#endif /* __linux__ */

1954

exitcode = EX_OSERR;

1955

/* Lower privileges */

1956

errno = 0;

1957

ret = seteuid(uid);

1958

if(ret == -1){

1959

perror_plus("seteuid");

1960

}

1961

goto end;

1962

}

1963

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

1964

network.ifr_flags |= IFF_UP;

1965

take_down_interface = true;

1966

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

1967

if(ret == -1){

1968

take_down_interface = false;

1969

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1970

exitcode = EX_OSERR;

1971

#ifdef __linux__

1972

if(restore_loglevel){

1973

ret = klogctl(7, NULL, 0);

1974

if(ret == -1){

1975

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;

1976

2213

}

1977

2214

}

1978

#endif /* __linux__ */

1979

/* Lower privileges */

1980

errno = 0;

1981

ret = seteuid(uid);

1982

if(ret == -1){

1983

perror_plus("seteuid");

1984

}

1985

goto end;

1986

}

1987

}

1988

/* Sleep checking until interface is running.

1989

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

1990

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

1991

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

1992

if(ret == -1){

1993

perror_plus("ioctl SIOCGIFFLAGS");

1994

} else if(network.ifr_flags & IFF_RUNNING){

1995

2215

break;

1996

2216

}

1997

struct timespec sleeptime = { .tv_nsec = 250000000 };

1998

ret = nanosleep(&sleeptime, NULL);

1999

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

2000

perror_plus("nanosleep");

2001

}

2002

}

2003

if(not take_down_interface){

2004

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

2005

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

2006

if(ret == -1){

2007

perror_plus("close");

2008

}

2009

}

2010

#ifdef __linux__

2011

if(restore_loglevel){

2012

/* Restores kernel loglevel to default */

2013

ret = klogctl(7, NULL, 0);

2014

if(ret == -1){

2015

perror_plus("klogctl");

2016

}

2017

}

2018

#endif /* __linux__ */

2019

/* Lower privileges */

2020

errno = 0;

2021

/* Lower privileges */

2022

ret = seteuid(uid);

2023

if(ret == -1){

2024

perror_plus("seteuid");

2025

}

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);

2026

2246

}

2027

2247

2028

2248

if(quit_now){

2029

2249

goto end;

2030

2250

}

2031

2251

2032

ret = init_gnutls_global(pubkey, seckey);

2252

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

2033

2253

if(ret == -1){

2034

2254

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

2035

2255

exitcode = EX_UNAVAILABLE;

2052

2272

goto end;

2053

2273

}

2054

2274

2055

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

2275

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

2056

2276

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

2057

2277

exitcode = EX_UNAVAILABLE;

2058

2278

goto end;

2068

2288

/* Connect directly, do not use Zeroconf */

2069

2289

/* (Mainly meant for debugging) */

2070

2290

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

2291

2071

2292

if(address == NULL){

2072

2293

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

2073

2294

exitcode = EX_USAGE;

2078

2299

goto end;

2079

2300

}

2080

2301

2081

uint16_t port;

2302

in_port_t port;

2082

2303

errno = 0;

2083

2304

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

2084

2305

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

2085

or tmpmax != (uint16_t)tmpmax){

2306

or tmpmax != (in_port_t)tmpmax){

2086

2307

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

2087

2308

exitcode = EX_USAGE;

2088

2309

goto end;

2089

2310

}

2090

2311

2091

2312

if(quit_now){

2092

2313

goto end;

2093

2314

}

2094

2315

2095

port = (uint16_t)tmpmax;

2316

port = (in_port_t)tmpmax;

2096

2317

*address = '\0';

2097

2318

/* Colon in address indicates IPv6 */

2098

2319

int af;

2114

2335

}

2115

2336

2116

2337

while(not quit_now){

2117

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

2338

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

2339

&mc);

2118

2340

if(quit_now or ret == 0){

2119

2341

break;

2120

2342

}

2122

2344

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

2123

2345

(int)retry_interval);

2124

2346

}

2125

sleep((int)retry_interval);

2347

sleep((unsigned int)retry_interval);

2126

2348

}

2127

2349

2128

2350

if (not quit_now){

2146

2368

config.publish_domain = 0;

2147

2369

2148

2370

/* Allocate a new server */

2149

mc.server = avahi_server_new(avahi_simple_poll_get

2150

(mc.simple_poll), &config, NULL,

2151

NULL, &error);

2371

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2372

&config, NULL, NULL, &ret_errno);

2152

2373

2153

2374

/* Free the Avahi configuration data */

2154

2375

avahi_server_config_free(&config);

2157

2378

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

2158

2379

if(mc.server == NULL){

2159

2380

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

2160

avahi_strerror(error));

2381

avahi_strerror(ret_errno));

2161

2382

exitcode = EX_UNAVAILABLE;

2162

2383

goto end;

2163

2384

}

2169

2390

/* Create the Avahi service browser */

2170

2391

sb = avahi_s_service_browser_new(mc.server, if_index,

2171

2392

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2172

NULL, 0, browse_callback, NULL);

2393

NULL, 0, browse_callback,

2394

(void *)&mc);

2173

2395

if(sb == NULL){

2174

2396

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

2175

2397

avahi_strerror(avahi_server_errno(mc.server)));

2187

2409

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

2188

2410

}

2189

2411

2190

ret = avahi_loop_with_timeout(mc.simple_poll,

2191

(int)(retry_interval * 1000));

2412

ret = avahi_loop_with_timeout(simple_poll,

2413

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

2192

2414

if(debug){

2193

2415

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

2194

2416

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

2201

2423

}

2202

2424

2203

2425

/* Cleanup things */

2426

free(mc.interfaces);

2427

2204

2428

if(sb != NULL)

2205

2429

avahi_s_service_browser_free(sb);

2206

2430

2207

2431

if(mc.server != NULL)

2208

2432

avahi_server_free(mc.server);

2209

2433

2210

if(mc.simple_poll != NULL)

2211

avahi_simple_poll_free(mc.simple_poll);

2434

if(simple_poll != NULL)

2435

avahi_simple_poll_free(simple_poll);

2212

2436

2213

2437

if(gnutls_initialized){

2214

2438

gnutls_certificate_free_credentials(mc.cred);

2231

2455

}

2232

2456

}

2233

2457

2234

/* Run network hooks */

2235

run_network_hooks("stop", interface, delay);

2236

2237

2458

/* Re-raise priviliges */

2238

2459

{

2239

errno = 0;

2240

ret = seteuid(0);

2241

if(ret == -1){

2242

perror_plus("seteuid");

2243

}

2244

2245

/* Take down the network interface */

2246

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

2247

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

2248

if(ret == -1){

2249

perror_plus("ioctl SIOCGIFFLAGS");

2250

} else if(network.ifr_flags & IFF_UP){

2251

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

2252

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

2253

if(ret == -1){

2254

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");

2255

2476

}

2256

2477

}

2257

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

2258

if(ret == -1){

2259

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");

2260

2481

}

2261

2482

}

2262

}

2263

/* Lower privileges permanently */

2264

errno = 0;

2265

ret = setuid(uid);

2266

if(ret == -1){

2267

perror_plus("setuid");

2268

}

2483

2484

lower_privileges_permanently();

2485

}

2486

2487

free(interfaces_to_take_down);

2488

free(interfaces_hooks);

2269

2489

2270

2490

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

2271

2491

if(tempdir_created){