/mandos/trunk : revision 670

9

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

10

*

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* Everything else is

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13

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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() */

135

141

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

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142

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;

143

151

AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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157

150

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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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160

AvahiServer *server;

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161

gnutls_certificate_credentials_t cred;

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162

unsigned int dh_bits;

157

164

const char *priority;

158

165

gpgme_ctx_t ctx;

159

166

server *current_server;

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char *interfaces;

168

size_t interfaces_size;

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169

} mandos_context;

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170

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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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173

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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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}

189

195

190

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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){

197

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

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

199

if(buffer == NULL){

204

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,

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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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232

perror_plus("strdup");

222

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return false;

223

234

}

235

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

236

if(ret == -1){

237

perror_plus("clock_gettime");

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return false;

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}

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/* Special case of first server */

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if (mc.current_server == NULL){

241

if(*current_server == NULL){

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242

new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

244

*current_server = new_server;

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

230

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} else {

231

new_server->next = mc.current_server;

232

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

247

new_server->next = *current_server;

248

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

233

249

new_server->prev->next = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

250

(*current_server)->prev = new_server;

240

251

}

241

252

return true;

242

253

}

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

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253

263

/*

254

264

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

255

265

*/

271

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return false;

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282

}

273

283

274

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

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/* Create new GPGME "context" */

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

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

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if(rc != GPG_ERR_NO_ERROR){

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

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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,

344

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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

357

gpgme_data_t dh_crypto, dh_plain;

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358

gpgme_error_t rc;

348

359

ssize_t ret;

374

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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

389

if(rc != GPG_ERR_NO_ERROR){

379

390

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

380

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

529

}

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530

520

531

ret = gnutls_certificate_set_openpgp_key_file

521

(mc.cred, pubkeyfilename, seckeyfilename,

532

(mc->cred, pubkeyfilename, seckeyfilename,

522

533

GNUTLS_OPENPGP_FMT_BASE64);

523

534

if(ret != GNUTLS_E_SUCCESS){

524

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

545

if(ret != GNUTLS_E_SUCCESS){

535

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

union {

626

struct sockaddr_in in;

627

struct sockaddr_in6 in6;

628

} to;

637

struct sockaddr_storage to;

629

638

char *buffer = NULL;

630

639

char *decrypted_buffer = NULL;

631

640

size_t buffer_length = 0;

655

664

return -1;

656

665

}

657

666

658

ret = init_gnutls_session(&session);

667

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

668

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

669

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

670

bool match = false;

671

{

672

char *interface = NULL;

673

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

674

interface))){

675

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

676

match = true;

677

break;

678

}

679

}

680

}

681

if(not match){

682

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

683

connect to the server */

684

if(debug){

685

char interface[IF_NAMESIZE];

686

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

687

perror_plus("if_indextoname");

688

} else {

689

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

690

" \"%s\"\n",

691

if_indextoname((unsigned int)if_index,

692

interface));

693

}

694

}

695

return -1;

696

}

697

}

698

699

ret = init_gnutls_session(&session, mc);

659

700

if(ret != 0){

660

701

return -1;

661

702

}

662

703

663

704

if(debug){

664

705

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

665

PRIu16 "\n", ip, port);

706

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

666

707

}

667

708

668

709

tcp_sd = socket(pf, SOCK_STREAM, 0);

680

721

681

722

memset(&to, 0, sizeof(to));

682

723

if(af == AF_INET6){

683

to.in6.sin6_family = (sa_family_t)af;

684

ret = inet_pton(af, ip, &to.in6.sin6_addr);

724

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

725

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

685

726

} else { /* IPv4 */

686

to.in.sin_family = (sa_family_t)af;

687

ret = inet_pton(af, ip, &to.in.sin_addr);

727

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

728

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

688

729

}

689

730

if(ret < 0 ){

690

731

int e = errno;

699

740

goto mandos_end;

700

741

}

701

742

if(af == AF_INET6){

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

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

708

-Wunreachable-code*/

743

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

744

if(IN6_IS_ADDR_LINKLOCAL

745

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

709

746

if(if_index == AVAHI_IF_UNSPEC){

710

747

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

711

748

" incomplete without a network interface\n");

713

750

goto mandos_end;

714

751

}

715

752

/* Set the network interface number as scope */

716

to.in6.sin6_scope_id = (uint32_t)if_index;

753

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

717

754

}

718

755

} else {

719

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

720

-Wconversion and

721

-Wunreachable-code */

756

((struct sockaddr_in *)&to)->sin_port = htons(port);

722

757

}

723

758

724

759

if(quit_now){

732

767

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

733

768

perror_plus("if_indextoname");

734

769

} else {

735

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

736

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

770

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

771

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

737

772

}

738

773

} else {

739

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

740

ip, port);

774

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

775

ip, (uintmax_t)port);

741

776

}

742

777

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

778

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

744

const char *pcret;

745

779

if(af == AF_INET6){

746

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

747

sizeof(addrstr));

780

ret = getnameinfo((struct sockaddr *)&to,

781

sizeof(struct sockaddr_in6),

782

addrstr, sizeof(addrstr), NULL, 0,

783

NI_NUMERICHOST);

748

784

} else {

749

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

750

sizeof(addrstr));

785

ret = getnameinfo((struct sockaddr *)&to,

786

sizeof(struct sockaddr_in),

787

addrstr, sizeof(addrstr), NULL, 0,

788

NI_NUMERICHOST);

751

789

}

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

}

790

if(ret == EAI_SYSTEM){

791

perror_plus("getnameinfo");

792

} else if(ret != 0) {

793

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

794

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

795

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

758

796

}

759

797

}

760

798

764

802

}

765

803

766

804

if(af == AF_INET6){

767

ret = connect(tcp_sd, &to.in6, sizeof(to));

805

ret = connect(tcp_sd, (struct sockaddr *)&to,

806

sizeof(struct sockaddr_in6));

768

807

} else {

769

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

808

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

809

sizeof(struct sockaddr_in));

770

810

}

771

811

if(ret < 0){

772

812

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

821

861

goto mandos_end;

822

862

}

823

863

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

864

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

865

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

866

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

867

gnutls_transport_set_ptr(session,

868

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

826

869

827

870

if(quit_now){

828

871

errno = EINTR;

933

976

if(buffer_length > 0){

934

977

ssize_t decrypted_buffer_size;

935

978

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

936

&decrypted_buffer);

979

&decrypted_buffer, mc);

937

980

if(decrypted_buffer_size >= 0){

938

981

939

982

written = 0;

1000

1043

AVAHI_GCC_UNUSED AvahiStringList *txt,

1001

1044

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1002

1045

flags,

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1046

void* mc){

1047

if(r == NULL){

1048

return;

1049

}

1005

1050

1006

1051

/* Called whenever a service has been resolved successfully or

1007

1052

timed out */

1016

1061

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

1017

1062

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

1018

1063

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

1064

avahi_strerror(avahi_server_errno

1065

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

1020

1066

break;

1021

1067

1022

1068

case AVAHI_RESOLVER_FOUND:

1028

1074

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

1029

1075

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

1030

1076

}

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1077

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

1078

interface,

1079

avahi_proto_to_af(proto),

1080

mc);

1033

1081

if(ret == 0){

1034

avahi_simple_poll_quit(mc.simple_poll);

1082

avahi_simple_poll_quit(simple_poll);

1035

1083

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1084

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

1085

avahi_proto_to_af(proto),

1086

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

1038

1087

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

1039

1088

" list\n", name);

1040

1089

}

1053

1102

const char *domain,

1054

1103

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1055

1104

flags,

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1105

void* mc){

1106

if(b == NULL){

1107

return;

1108

}

1058

1109

1059

1110

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

1060

1111

is removed from the LAN */

1068

1119

case AVAHI_BROWSER_FAILURE:

1069

1120

1070

1121

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1122

avahi_strerror(avahi_server_errno

1123

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

1124

avahi_simple_poll_quit(simple_poll);

1073

1125

return;

1074

1126

1075

1127

case AVAHI_BROWSER_NEW:

1078

1130

the callback function is called the Avahi server will free the

1079

1131

resolver for us. */

1080

1132

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1133

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

1134

interface, protocol, name, type,

1135

domain, protocol, 0,

1136

resolve_callback, mc) == NULL)

1084

1137

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

1085

1138

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

1139

avahi_strerror(avahi_server_errno

1140

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

1087

1141

break;

1088

1142

1089

1143

case AVAHI_BROWSER_REMOVE:

1108

1162

signal_received = sig;

1109

1163

int old_errno = errno;

1110

1164

/* set main loop to exit */

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1165

if(simple_poll != NULL){

1166

avahi_simple_poll_quit(simple_poll);

1113

1167

}

1114

1168

errno = old_errno;

1115

1169

}

1116

1170

1117

1171

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

1118

1172

int ret;

1173

error_t ret_errno;

1119

1174

1120

1175

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

1121

1176

if(s < 0){

1177

ret_errno = errno;

1122

1178

perror_plus("socket");

1179

errno = ret_errno;

1123

1180

return false;

1124

1181

}

1125

1182

strcpy(ifr->ifr_name, ifname);

1126

1183

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

1184

if(ret == -1){

1128

1185

if(debug){

1186

ret_errno = errno;

1129

1187

perror_plus("ioctl SIOCGIFFLAGS");

1188

errno = ret_errno;

1130

1189

}

1131

1190

return false;

1132

1191

}

1201

1260

}

1202

1261

1203

1262

/*

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;

1263

* This function determines if a network interface is up.

1264

*/

1265

bool interface_is_up(const char *interface){

1266

struct ifreq ifr;

1267

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

1268

if(debug){

1269

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

1270

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

1271

}

1272

return false;

1273

}

1274

1275

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

1276

}

1277

1278

/*

1279

* This function determines if a network interface is running

1280

*/

1281

bool interface_is_running(const char *interface){

1282

struct ifreq ifr;

1283

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

1284

if(debug){

1285

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

1286

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

1287

}

1288

return false;

1289

}

1290

1291

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

1244

1292

}

1245

1293

1246

1294

int notdotentries(const struct dirent *direntry){

1315

1363

return 1;

1316

1364

}

1317

1365

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1366

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1367

mandos_context *mc){

1319

1368

int ret;

1320

1369

struct timespec now;

1321

1370

struct timespec waited_time;

1322

1371

intmax_t block_time;

1323

1372

1324

1373

while(true){

1325

if(mc.current_server == NULL){

1374

if(mc->current_server == NULL){

1326

1375

if (debug){

1327

1376

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

1328

1377

" No timeout!\n");

1342

1391

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

1343

1392

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

1344

1393

waited_time.tv_sec = (now.tv_sec

1345

- mc.current_server->last_seen.tv_sec);

1394

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

1346

1395

waited_time.tv_nsec = (now.tv_nsec

1347

- mc.current_server->last_seen.tv_nsec);

1396

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

1348

1397

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

1349

1398

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

1350

1399

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

1358

1407

}

1359

1408

1360

1409

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);

1410

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

1411

mc->current_server->port,

1412

mc->current_server->if_index,

1413

mc->current_server->af, mc);

1365

1414

if(ret == 0){

1366

avahi_simple_poll_quit(mc.simple_poll);

1415

avahi_simple_poll_quit(s);

1367

1416

return 0;

1368

1417

}

1369

1418

ret = clock_gettime(CLOCK_MONOTONIC,

1370

&mc.current_server->last_seen);

1419

&mc->current_server->last_seen);

1371

1420

if(ret == -1){

1372

1421

perror_plus("clock_gettime");

1373

1422

return -1;

1374

1423

}

1375

mc.current_server = mc.current_server->next;

1424

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

1376

1425

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

1377

1426

servers, but don't block */

1378

1427

}

1387

1436

}

1388

1437

}

1389

1438

1439

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

1440

error_t raise_privileges(void){

1441

error_t old_errno = errno;

1442

error_t ret_errno = 0;

1443

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

1444

ret_errno = errno;

1445

perror_plus("seteuid");

1446

}

1447

errno = old_errno;

1448

return ret_errno;

1449

}

1450

1451

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

1452

error_t raise_privileges_permanently(void){

1453

error_t old_errno = errno;

1454

error_t ret_errno = raise_privileges();

1455

if(ret_errno != 0){

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

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

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

error_t lower_privileges(void){

1469

error_t old_errno = errno;

1470

error_t ret_errno = 0;

1471

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

1472

ret_errno = errno;

1473

perror_plus("seteuid");

1474

}

1475

errno = old_errno;

1476

return ret_errno;

1477

}

1478

1479

/* Lower privileges permanently */

1480

error_t lower_privileges_permanently(void){

1481

error_t old_errno = errno;

1482

error_t ret_errno = 0;

1483

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

1484

ret_errno = errno;

1485

perror_plus("setuid");

1486

}

1487

errno = old_errno;

1488

return ret_errno;

1489

}

1490

1390

1491

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

1391

1492

const float delay){

1392

1493

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

1494

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

1396

1495

alphasort);

1397

1496

if(numhooks == -1){

1398

perror_plus("scandir");

1497

if(errno == ENOENT){

1498

if(debug){

1499

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

1500

" found\n", hookdir);

1501

}

1502

} else {

1503

perror_plus("scandir");

1504

}

1399

1505

} else {

1506

struct dirent *direntry;

1507

int ret;

1400

1508

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

1401

1509

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

1402

1510

direntry = direntries[i];

1414

1522

if(hook_pid == 0){

1415

1523

/* Child */

1416

1524

/* 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

}

1525

raise_privileges_permanently();

1428

1526

/* Set group */

1429

1527

errno = 0;

1430

1528

ret = setgid(0);

1523

1621

return true;

1524

1622

}

1525

1623

1624

error_t bring_up_interface(const char *const interface,

1625

const float delay){

1626

int sd = -1;

1627

error_t old_errno = errno;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

1630

struct ifreq network;

1631

unsigned int if_index = if_nametoindex(interface);

1632

if(if_index == 0){

1633

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

1634

errno = old_errno;

1635

return ENXIO;

1636

}

1637

1638

if(quit_now){

1639

errno = old_errno;

1640

return EINTR;

1641

}

1642

1643

if(not interface_is_up(interface)){

1644

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

1645

ret_errno = errno;

1646

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

1647

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

1648

return ret_errno;

1649

}

1650

network.ifr_flags |= IFF_UP;

1651

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

1654

ret_errno = errno;

1655

perror_plus("socket");

1656

errno = old_errno;

1657

return ret_errno;

1658

}

1659

1660

if(quit_now){

1661

close(sd);

1662

errno = old_errno;

1663

return EINTR;

1664

}

1665

1666

if(debug){

1667

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

1668

interface);

1669

}

1670

1671

/* Raise priviliges */

1672

raise_privileges();

1673

1674

#ifdef __linux__

1675

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1676

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

1677

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

1678

bool restore_loglevel = true;

1679

if(ret_linux == -1){

1680

restore_loglevel = false;

1681

perror_plus("klogctl");

1682

}

1683

#endif /* __linux__ */

1684

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

1685

ret_errno = errno;

1686

#ifdef __linux__

1687

if(restore_loglevel){

1688

ret_linux = klogctl(7, NULL, 0);

1689

if(ret_linux == -1){

1690

perror_plus("klogctl");

1691

}

1692

}

1693

#endif /* __linux__ */

1694

1695

/* Lower privileges */

1696

lower_privileges();

1697

1698

/* Close the socket */

1699

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

1700

if(ret == -1){

1701

perror_plus("close");

1702

}

1703

1704

if(ret_setflags == -1){

1705

errno = ret_errno;

1706

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1707

errno = old_errno;

1708

return ret_errno;

1709

}

1710

} else if(debug){

1711

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

1712

interface);

1713

}

1714

1715

/* Sleep checking until interface is running.

1716

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

1717

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

1718

if(interface_is_running(interface)){

1719

break;

1720

}

1721

struct timespec sleeptime = { .tv_nsec = 250000000 };

1722

ret = nanosleep(&sleeptime, NULL);

1723

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

1724

perror_plus("nanosleep");

1725

}

1726

}

1727

1728

errno = old_errno;

1729

return 0;

1730

}

1731

1732

error_t take_down_interface(const char *const interface){

1733

error_t old_errno = errno;

1734

struct ifreq network;

1735

unsigned int if_index = if_nametoindex(interface);

1736

if(if_index == 0){

1737

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

1738

errno = old_errno;

1739

return ENXIO;

1740

}

1741

if(interface_is_up(interface)){

1742

error_t ret_errno = 0;

1743

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

1744

ret_errno = errno;

1745

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

1746

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

1747

return ret_errno;

1748

}

1749

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

1750

1751

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

1752

if(sd < 0){

1753

ret_errno = errno;

1754

perror_plus("socket");

1755

errno = old_errno;

1756

return ret_errno;

1757

}

1758

1759

if(debug){

1760

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

1761

interface);

1762

}

1763

1764

/* Raise priviliges */

1765

raise_privileges();

1766

1767

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

1768

ret_errno = errno;

1769

1770

/* Lower privileges */

1771

lower_privileges();

1772

1773

/* Close the socket */

1774

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

1775

if(ret == -1){

1776

perror_plus("close");

1777

}

1778

1779

if(ret_setflags == -1){

1780

errno = ret_errno;

1781

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1782

errno = old_errno;

1783

return ret_errno;

1784

}

1785

} else if(debug){

1786

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

1787

interface);

1788

}

1789

1790

errno = old_errno;

1791

return 0;

1792

}

1793

1526

1794

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

1795

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

1796

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

1797

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

1798

.interfaces = NULL, .interfaces_size = 0 };

1527

1799

AvahiSServiceBrowser *sb = NULL;

1528

int error;

1800

error_t ret_errno;

1529

1801

int ret;

1530

1802

intmax_t tmpmax;

1531

1803

char *tmp;

1532

1804

int exitcode = EXIT_SUCCESS;

1533

const char *interface = "";

1534

struct ifreq network;

1535

int sd = -1;

1536

bool take_down_interface = false;

1537

uid_t uid;

1538

gid_t gid;

1805

char *interfaces_to_take_down = NULL;

1806

size_t interfaces_to_take_down_size = 0;

1539

1807

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

1540

1808

bool tempdir_created = false;

1541

1809

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1542

1810

const char *seckey = PATHDIR "/" SECKEY;

1543

1811

const char *pubkey = PATHDIR "/" PUBKEY;

1812

char *interfaces_hooks = NULL;

1544

1813

1545

1814

bool gnutls_initialized = false;

1546

1815

bool gpgme_initialized = false;

1637

1906

connect_to = arg;

1638

1907

break;

1639

1908

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

1640

interface = arg;

1909

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

1910

arg, (int)',');

1911

if(ret_errno != 0){

1912

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

1913

}

1641

1914

break;

1642

1915

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

1643

1916

seckey = arg;

1721

1994

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

1722

1995

1723

1996

/* Re-raise priviliges */

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

1728

} else {

1997

if(raise_privileges() == 0){

1729

1998

struct stat st;

1730

1999

1731

2000

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

1771

2040

}

1772

2041

1773

2042

/* Lower privileges */

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

2043

lower_privileges();

2044

}

2045

}

2046

2047

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

2048

{

2049

char *interface = NULL;

2050

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

2051

interface))){

2052

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

2053

and if_nametoindex(interface) == 0){

2054

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

2055

fprintf_plus(stderr, "Not using nonexisting interface"

2056

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

2057

}

2058

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

2059

interface = NULL;

1778

2060

}

1779

2061

}

1780

2062

}

1781

2063

1782

2064

/* Run network hooks */

1783

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

1784

goto end;

2065

{

2066

if(mc.interfaces != NULL){

2067

interfaces_hooks = malloc(mc.interfaces_size);

2068

if(interfaces_hooks == NULL){

2069

perror_plus("malloc");

2070

goto end;

2071

}

2072

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

2073

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

2074

}

2075

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

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

1785

2079

}

1786

2080

1787

2081

if(not debug){

1788

2082

avahi_set_log_function(empty_log);

1789

2083

}

1790

2084

1791

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

1792

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1795

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

if(ret >= 1){

1803

/* Pick the first interface returned */

1804

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

1805

if(debug){

1806

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

1807

}

1808

if(interface == NULL){

1809

perror_plus("malloc");

1810

free(direntries);

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

free(direntries);

1815

} else {

1816

free(direntries);

1817

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

1818

exitcode = EXIT_FAILURE;

1819

goto end;

1820

}

1821

}

1822

1823

2085

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

1824

2086

from the signal handler */

1825

2087

/* Initialize the pseudo-RNG for Avahi */

1826

2088

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

1827

mc.simple_poll = avahi_simple_poll_new();

1828

if(mc.simple_poll == NULL){

2089

simple_poll = avahi_simple_poll_new();

2090

if(simple_poll == NULL){

1829

2091

fprintf_plus(stderr,

1830

2092

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

1831

2093

exitcode = EX_UNAVAILABLE;

1895

2157

}

1896

2158

}

1897

2159

1898

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

1899

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

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

if(if_index == 0){

1902

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

1903

exitcode = EX_UNAVAILABLE;

1904

goto end;

1905

}

1906

1907

if(quit_now){

1908

goto end;

1909

}

1910

1911

/* Re-raise priviliges */

1912

errno = 0;

1913

ret = seteuid(0);

1914

if(ret == -1){

1915

perror_plus("seteuid");

1916

}

1917

1918

#ifdef __linux__

1919

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1920

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

1921

ret = klogctl(8, NULL, 5);

1922

bool restore_loglevel = true;

1923

if(ret == -1){

1924

restore_loglevel = false;

1925

perror_plus("klogctl");

1926

}

1927

#endif /* __linux__ */

1928

1929

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1930

if(sd < 0){

1931

perror_plus("socket");

1932

exitcode = EX_OSERR;

1933

#ifdef __linux__

1934

if(restore_loglevel){

1935

ret = klogctl(7, NULL, 0);

1936

if(ret == -1){

1937

perror_plus("klogctl");

1938

}

1939

}

1940

#endif /* __linux__ */

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

strcpy(network.ifr_name, interface);

1950

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

1951

if(ret == -1){

1952

perror_plus("ioctl SIOCGIFFLAGS");

1953

#ifdef __linux__

1954

if(restore_loglevel){

1955

ret = klogctl(7, NULL, 0);

1956

if(ret == -1){

1957

perror_plus("klogctl");

1958

}

1959

}

1960

#endif /* __linux__ */

1961

exitcode = EX_OSERR;

1962

/* Lower privileges */

1963

errno = 0;

1964

ret = seteuid(uid);

1965

if(ret == -1){

1966

perror_plus("seteuid");

1967

}

1968

goto end;

1969

}

1970

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

1971

network.ifr_flags |= IFF_UP;

1972

take_down_interface = true;

1973

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

1974

if(ret == -1){

1975

take_down_interface = false;

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1977

exitcode = EX_OSERR;

1978

#ifdef __linux__

1979

if(restore_loglevel){

1980

ret = klogctl(7, NULL, 0);

1981

if(ret == -1){

1982

perror_plus("klogctl");

2160

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

2161

if(mc.interfaces == NULL){

2162

struct dirent **direntries;

2163

/* Look for any good interfaces */

2164

ret = scandir(sys_class_net, &direntries, good_interface,

2165

alphasort);

2166

if(ret >= 1){

2167

/* Add all found interfaces to interfaces list */

2168

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

2169

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

2170

direntries[i]->d_name);

2171

if(ret_errno != 0){

2172

errno = ret_errno;

2173

perror_plus("argz_add");

2174

continue;

2175

}

2176

if(debug){

2177

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

2178

direntries[i]->d_name);

2179

}

2180

}

2181

free(direntries);

2182

} else {

2183

free(direntries);

2184

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

2185

exitcode = EXIT_FAILURE;

2186

goto end;

2187

}

2188

}

2189

2190

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

2191

{

2192

char *interface = NULL;

2193

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

2194

interface))){

2195

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

2196

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

2197

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

2198

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

2199

interface);

2200

interface = NULL;

2201

while((interface = argz_next(mc.interfaces,

2202

mc.interfaces_size, interface))){

2203

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

2204

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

2205

interface);

2206

interface = NULL;

1983

2207

}

1984

2208

}

1985

#endif /* __linux__ */

1986

/* Lower privileges */

1987

errno = 0;

1988

ret = seteuid(uid);

1989

if(ret == -1){

1990

perror_plus("seteuid");

1991

}

1992

goto end;

1993

}

1994

}

1995

/* Sleep checking until interface is running.

1996

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

1997

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

1998

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

1999

if(ret == -1){

2000

perror_plus("ioctl SIOCGIFFLAGS");

2001

} else if(network.ifr_flags & IFF_RUNNING){

2002

2209

break;

2003

2210

}

2004

struct timespec sleeptime = { .tv_nsec = 250000000 };

2005

ret = nanosleep(&sleeptime, NULL);

2006

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

2007

perror_plus("nanosleep");

2008

}

2009

}

2010

if(not take_down_interface){

2011

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

2012

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

2013

if(ret == -1){

2014

perror_plus("close");

2015

}

2016

}

2017

#ifdef __linux__

2018

if(restore_loglevel){

2019

/* Restores kernel loglevel to default */

2020

ret = klogctl(7, NULL, 0);

2021

if(ret == -1){

2022

perror_plus("klogctl");

2023

}

2024

}

2025

#endif /* __linux__ */

2026

/* Lower privileges */

2027

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

2032

}

2211

bool interface_was_up = interface_is_up(interface);

2212

ret = bring_up_interface(interface, delay);

2213

if(not interface_was_up){

2214

if(ret != 0){

2215

errno = ret;

2216

perror_plus("Failed to bring up interface");

2217

} else {

2218

ret_errno = argz_add(&interfaces_to_take_down,

2219

&interfaces_to_take_down_size,

2220

interface);

2221

if(ret_errno != 0){

2222

errno = ret_errno;

2223

perror_plus("argz_add");

2224

}

2225

}

2226

}

2227

}

2228

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

2229

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

2230

}

2231

}

2232

2233

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

2234

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

2235

if(debug){

2236

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

2237

mc.interfaces);

2238

}

2239

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

2033

2240

}

2034

2241

2035

2242

if(quit_now){

2036

2243

goto end;

2037

2244

}

2038

2245

2039

ret = init_gnutls_global(pubkey, seckey);

2246

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

2040

2247

if(ret == -1){

2041

2248

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

2042

2249

exitcode = EX_UNAVAILABLE;

2059

2266

goto end;

2060

2267

}

2061

2268

2062

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

2269

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

2063

2270

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

2064

2271

exitcode = EX_UNAVAILABLE;

2065

2272

goto end;

2075

2282

/* Connect directly, do not use Zeroconf */

2076

2283

/* (Mainly meant for debugging) */

2077

2284

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

2285

2078

2286

if(address == NULL){

2079

2287

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

2080

2288

exitcode = EX_USAGE;

2085

2293

goto end;

2086

2294

}

2087

2295

2088

uint16_t port;

2296

in_port_t port;

2089

2297

errno = 0;

2090

2298

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

2091

2299

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

2092

or tmpmax != (uint16_t)tmpmax){

2300

or tmpmax != (in_port_t)tmpmax){

2093

2301

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

2094

2302

exitcode = EX_USAGE;

2095

2303

goto end;

2096

2304

}

2097

2305

2098

2306

if(quit_now){

2099

2307

goto end;

2100

2308

}

2101

2309

2102

port = (uint16_t)tmpmax;

2310

port = (in_port_t)tmpmax;

2103

2311

*address = '\0';

2104

2312

/* Colon in address indicates IPv6 */

2105

2313

int af;

2121

2329

}

2122

2330

2123

2331

while(not quit_now){

2124

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

2332

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

2333

&mc);

2125

2334

if(quit_now or ret == 0){

2126

2335

break;

2127

2336

}

2129

2338

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

2130

2339

(int)retry_interval);

2131

2340

}

2132

sleep((int)retry_interval);

2341

sleep((unsigned int)retry_interval);

2133

2342

}

2134

2343

2135

2344

if (not quit_now){

2153

2362

config.publish_domain = 0;

2154

2363

2155

2364

/* Allocate a new server */

2156

mc.server = avahi_server_new(avahi_simple_poll_get

2157

(mc.simple_poll), &config, NULL,

2158

NULL, &error);

2365

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2366

&config, NULL, NULL, &ret_errno);

2159

2367

2160

2368

/* Free the Avahi configuration data */

2161

2369

avahi_server_config_free(&config);

2164

2372

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

2165

2373

if(mc.server == NULL){

2166

2374

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

2167

avahi_strerror(error));

2375

avahi_strerror(ret_errno));

2168

2376

exitcode = EX_UNAVAILABLE;

2169

2377

goto end;

2170

2378

}

2176

2384

/* Create the Avahi service browser */

2177

2385

sb = avahi_s_service_browser_new(mc.server, if_index,

2178

2386

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2179

NULL, 0, browse_callback, NULL);

2387

NULL, 0, browse_callback,

2388

(void *)&mc);

2180

2389

if(sb == NULL){

2181

2390

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

2182

2391

avahi_strerror(avahi_server_errno(mc.server)));

2194

2403

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

2195

2404

}

2196

2405

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

2406

ret = avahi_loop_with_timeout(simple_poll,

2407

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

2199

2408

if(debug){

2200

2409

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

2201

2410

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

2208

2417

}

2209

2418

2210

2419

/* Cleanup things */

2420

free(mc.interfaces);

2421

2211

2422

if(sb != NULL)

2212

2423

avahi_s_service_browser_free(sb);

2213

2424

2214

2425

if(mc.server != NULL)

2215

2426

avahi_server_free(mc.server);

2216

2427

2217

if(mc.simple_poll != NULL)

2218

avahi_simple_poll_free(mc.simple_poll);

2428

if(simple_poll != NULL)

2429

avahi_simple_poll_free(simple_poll);

2219

2430

2220

2431

if(gnutls_initialized){

2221

2432

gnutls_certificate_free_credentials(mc.cred);

2238

2449

}

2239

2450

}

2240

2451

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2244

2452

/* Re-raise priviliges */

2245

2453

{

2246

errno = 0;

2247

ret = seteuid(0);

2248

if(ret == -1){

2249

perror_plus("seteuid");

2250

}

2251

2252

/* Take down the network interface */

2253

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

2254

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

2255

if(ret == -1){

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

2258

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

2259

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

2260

if(ret == -1){

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2454

raise_privileges();

2455

2456

/* Run network hooks */

2457

run_network_hooks("stop", interfaces_hooks != NULL ?

2458

interfaces_hooks : "", delay);

2459

2460

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

2461

{

2462

char *interface = NULL;

2463

while((interface=argz_next(interfaces_to_take_down,

2464

interfaces_to_take_down_size,

2465

interface))){

2466

ret_errno = take_down_interface(interface);

2467

if(ret_errno != 0){

2468

errno = ret_errno;

2469

perror_plus("Failed to take down interface");

2262

2470

}

2263

2471

}

2264

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

2265

if(ret == -1){

2266

perror_plus("close");

2472

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

2473

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

2474

" down\n");

2267

2475

}

2268

2476

}

2269

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2477

2478

lower_privileges_permanently();

2479

}

2480

2481

free(interfaces_to_take_down);

2482

free(interfaces_hooks);

2276

2483

2277

2484

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

2278

2485

if(tempdir_created){