/mandos/release : revision 237.16.11

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

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*

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* Everything else is

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*

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* This program is free software: you can redistribute it and/or

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

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#include <stdio.h> /* fprintf(), stderr, fwrite(),

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stdout, ferror(), remove() */

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

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

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#include <stddef.h> /* NULL, size_t, ssize_t */

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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

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strtof(), abort() */

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*/

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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

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strtoimax() */

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#include <assert.h> /* assert() */

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#include <errno.h> /* perror(), errno,

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program_invocation_short_name */

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#include <time.h> /* nanosleep(), time(), sleep() */

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*/

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

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

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

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setgid(), pause() */

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

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

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#ifdef __linux__

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

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

139

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

141

uid_t uid = 65534;

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gid_t gid = 65534;

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137

144

138

/* 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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in_port_t port;

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uint16_t port;

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AvahiIfIndex if_index;

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int af;

150

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struct timespec last_seen;

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148

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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const char *priority;

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gpgme_ctx_t ctx;

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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159

} mandos_context;

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160

168

/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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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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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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169

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

184

177

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

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va_list ap;

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va_start (ap, format);

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

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program_invocation_short_name));

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

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

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184

}

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/*

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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, in_port_t port, AvahiIfIndex if_index,

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int af, server **current_server){

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

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int af){

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int ret;

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

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if(new_server == NULL){

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perror_plus("malloc");

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return false;

210

return -1;

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211

}

219

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

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.port = port,

222

215

.af = af };

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if(new_server->ip == NULL){

224

217

perror_plus("strdup");

225

return false;

218

return -1;

226

219

}

227

220

/* Special case of first server */

228

if(*current_server == NULL){

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if (mc.current_server == NULL){

229

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new_server->next = new_server;

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new_server->prev = new_server;

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*current_server = new_server;

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mc.current_server = new_server;

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

233

226

} else {

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new_server->next = *current_server;

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

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new_server->next = mc.current_server;

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

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229

new_server->prev->next = new_server;

237

(*current_server)->prev = new_server;

230

mc.current_server->prev = new_server;

238

231

}

239

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

232

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

240

233

if(ret == -1){

241

234

perror_plus("clock_gettime");

242

return false;

235

return -1;

243

236

}

244

return true;

237

return 0;

245

238

}

246

239

247

240

/*

248

241

* Initialize GPGME.

249

242

*/

250

243

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

251

const char *tempdir, mandos_context *mc){

244

const char *tempdir){

252

245

gpgme_error_t rc;

253

246

gpgme_engine_info_t engine_info;

254

247

248

255

249

/*

256

250

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

257

251

*/

273

267

return false;

274

268

}

275

269

276

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

270

rc = gpgme_op_import(mc.ctx, pgp_data);

277

271

if(rc != GPG_ERR_NO_ERROR){

278

272

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

279

273

gpgme_strsource(rc), gpgme_strerror(rc));

323

317

}

324

318

325

319

/* Create new GPGME "context" */

326

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

320

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

327

321

if(rc != GPG_ERR_NO_ERROR){

328

322

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

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323

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

344

338

*/

345

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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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mandos_context *mc){

341

char **plaintext){

349

342

gpgme_data_t dh_crypto, dh_plain;

350

343

gpgme_error_t rc;

351

344

ssize_t ret;

377

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378

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

379

372

data buffer */

380

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

373

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

381

374

if(rc != GPG_ERR_NO_ERROR){

382

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

383

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gpgme_strsource(rc), gpgme_strerror(rc));

384

377

plaintext_length = -1;

385

378

if(debug){

386

379

gpgme_decrypt_result_t result;

387

result = gpgme_op_decrypt_result(mc->ctx);

380

result = gpgme_op_decrypt_result(mc.ctx);

388

381

if(result == NULL){

389

382

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

390

383

} else {

468

461

}

469

462

470

463

static const char * safer_gnutls_strerror(int value){

471

const char *ret = gnutls_strerror(value);

464

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

465

-Wunreachable-code */

472

466

if(ret == NULL)

473

467

ret = "(unknown)";

474

468

return ret;

481

475

}

482

476

483

477

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename,

485

mandos_context *mc){

478

const char *seckeyfilename){

486

479

int ret;

487

480

488

481

if(debug){

505

498

}

506

499

507

500

/* OpenPGP credentials */

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

509

502

if(ret != GNUTLS_E_SUCCESS){

510

503

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

511

504

safer_gnutls_strerror(ret));

521

514

}

522

515

523

516

ret = gnutls_certificate_set_openpgp_key_file

524

(mc->cred, pubkeyfilename, seckeyfilename,

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(mc.cred, pubkeyfilename, seckeyfilename,

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518

GNUTLS_OPENPGP_FMT_BASE64);

526

519

if(ret != GNUTLS_E_SUCCESS){

527

520

fprintf_plus(stderr,

533

526

}

534

527

535

528

/* GnuTLS server initialization */

536

ret = gnutls_dh_params_init(&mc->dh_params);

529

ret = gnutls_dh_params_init(&mc.dh_params);

537

530

if(ret != GNUTLS_E_SUCCESS){

538

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

532

" initialization: %s\n",

540

533

safer_gnutls_strerror(ret));

541

534

goto globalfail;

542

535

}

543

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

536

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

544

537

if(ret != GNUTLS_E_SUCCESS){

545

538

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

546

539

safer_gnutls_strerror(ret));

547

540

goto globalfail;

548

541

}

549

542

550

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

543

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

551

544

552

545

return 0;

553

546

554

547

globalfail:

555

548

556

gnutls_certificate_free_credentials(mc->cred);

549

gnutls_certificate_free_credentials(mc.cred);

557

550

gnutls_global_deinit();

558

gnutls_dh_params_deinit(mc->dh_params);

551

gnutls_dh_params_deinit(mc.dh_params);

559

552

return -1;

560

553

}

561

554

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

555

static int init_gnutls_session(gnutls_session_t *session){

564

556

int ret;

565

557

/* GnuTLS session creation */

566

558

do {

578

570

{

579

571

const char *err;

580

572

do {

581

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

573

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

582

574

if(quit_now){

583

575

gnutls_deinit(*session);

584

576

return -1;

595

587

596

588

do {

597

589

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc->cred);

590

mc.cred);

599

591

if(quit_now){

600

592

gnutls_deinit(*session);

601

593

return -1;

611

603

/* ignore client certificate if any. */

612

604

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

605

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

615

607

616

608

return 0;

617

609

}

621

613

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

622

614

623

615

/* Called when a Mandos server is found */

624

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

616

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

625

617

AvahiIfIndex if_index,

626

int af, mandos_context *mc){

618

int af){

627

619

int ret, tcp_sd = -1;

628

620

ssize_t sret;

629

621

union {

659

651

return -1;

660

652

}

661

653

662

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

663

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

664

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

665

bool match = false;

666

{

667

char *interface = NULL;

668

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

669

interface))){

670

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

671

match = true;

672

break;

673

}

674

}

675

}

676

if(not match){

677

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

678

connect to the server */

679

if(debug){

680

char interface[IF_NAMESIZE];

681

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

682

perror_plus("if_indextoname");

683

} else {

684

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

685

" \"%s\"\n",

686

if_indextoname((unsigned int)if_index,

687

interface));

688

}

689

}

690

return -1;

691

}

692

}

693

694

ret = init_gnutls_session(&session, mc);

654

ret = init_gnutls_session(&session);

695

655

if(ret != 0){

696

656

return -1;

697

657

}

698

658

699

659

if(debug){

700

660

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

701

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

661

PRIu16 "\n", ip, port);

702

662

}

703

663

704

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

735

695

goto mandos_end;

736

696

}

737

697

if(af == AF_INET6){

738

to.in6.sin6_port = htons(port);

698

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

699

-Wconversion and

700

-Wunreachable-code */

701

739

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

703

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

741

704

-Wunreachable-code*/

765

728

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

766

729

perror_plus("if_indextoname");

767

730

} else {

768

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

769

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

731

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

732

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

770

733

}

771

734

} else {

772

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

773

ip, (uintmax_t)port);

735

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

736

ip, port);

774

737

}

775

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

776

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

854

817

goto mandos_end;

855

818

}

856

819

857

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

858

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

859

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

860

gnutls_transport_set_ptr(session,

861

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

820

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

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

862

822

863

823

if(quit_now){

864

824

errno = EINTR;

969

929

if(buffer_length > 0){

970

930

ssize_t decrypted_buffer_size;

971

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

972

&decrypted_buffer, mc);

932

&decrypted_buffer);

973

933

if(decrypted_buffer_size >= 0){

974

934

975

935

written = 0;

1036

996

AVAHI_GCC_UNUSED AvahiStringList *txt,

1037

997

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1038

998

flags,

1039

void* mc){

1040

if(r == NULL){

1041

return;

1042

}

999

AVAHI_GCC_UNUSED void* userdata){

1000

assert(r);

1043

1001

1044

1002

/* Called whenever a service has been resolved successfully or

1045

1003

timed out */

1054

1012

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

1055

1013

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

1056

1014

domain,

1057

avahi_strerror(avahi_server_errno

1058

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

1015

avahi_strerror(avahi_server_errno(mc.server)));

1059

1016

break;

1060

1017

1061

1018

case AVAHI_RESOLVER_FOUND:

1067

1024

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

1068

1025

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

1069

1026

}

1070

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

1071

interface,

1072

avahi_proto_to_af(proto),

1073

mc);

1027

int ret = start_mandos_communication(ip, port, interface,

1028

avahi_proto_to_af(proto));

1074

1029

if(ret == 0){

1075

avahi_simple_poll_quit(simple_poll);

1030

avahi_simple_poll_quit(mc.simple_poll);

1076

1031

} else {

1077

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

1078

avahi_proto_to_af(proto),

1079

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

1080

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

1081

" list\n", name);

1082

}

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1083

1034

}

1084

1035

}

1085

1036

}

1095

1046

const char *domain,

1096

1047

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1097

1048

flags,

1098

void* mc){

1099

if(b == NULL){

1100

return;

1101

}

1049

AVAHI_GCC_UNUSED void* userdata){

1050

assert(b);

1102

1051

1103

1052

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

1104

1053

is removed from the LAN */

1112

1061

case AVAHI_BROWSER_FAILURE:

1113

1062

1114

1063

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

1115

avahi_strerror(avahi_server_errno

1116

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

1117

avahi_simple_poll_quit(simple_poll);

1064

avahi_strerror(avahi_server_errno(mc.server)));

1065

avahi_simple_poll_quit(mc.simple_poll);

1118

1066

return;

1119

1067

1120

1068

case AVAHI_BROWSER_NEW:

1123

1071

the callback function is called the Avahi server will free the

1124

1072

resolver for us. */

1125

1073

1126

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

1127

interface, protocol, name, type,

1128

domain, protocol, 0,

1129

resolve_callback, mc) == NULL)

1074

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

1075

name, type, domain, protocol, 0,

1076

resolve_callback, NULL) == NULL)

1130

1077

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

1131

1078

" %s\n", name,

1132

avahi_strerror(avahi_server_errno

1133

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

1079

avahi_strerror(avahi_server_errno(mc.server)));

1134

1080

break;

1135

1081

1136

1082

case AVAHI_BROWSER_REMOVE:

1155

1101

signal_received = sig;

1156

1102

int old_errno = errno;

1157

1103

/* set main loop to exit */

1158

if(simple_poll != NULL){

1159

avahi_simple_poll_quit(simple_poll);

1104

if(mc.simple_poll != NULL){

1105

avahi_simple_poll_quit(mc.simple_poll);

1160

1106

}

1161

1107

errno = old_errno;

1162

1108

}

1163

1109

1164

1110

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

1165

1111

int ret;

1166

error_t ret_errno;

1167

1112

1168

1113

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

1169

1114

if(s < 0){

1170

ret_errno = errno;

1171

1115

perror_plus("socket");

1172

errno = ret_errno;

1173

1116

return false;

1174

1117

}

1175

1118

strcpy(ifr->ifr_name, ifname);

1176

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1177

1120

if(ret == -1){

1178

1121

if(debug){

1179

ret_errno = errno;

1180

1122

perror_plus("ioctl SIOCGIFFLAGS");

1181

errno = ret_errno;

1182

1123

}

1183

1124

return false;

1184

1125

}

1253

1194

}

1254

1195

1255

1196

/*

1256

* This function determines if a network interface is up.

1257

*/

1258

bool interface_is_up(const char *interface){

1259

struct ifreq ifr;

1260

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

1261

if(debug){

1262

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

1263

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

1264

}

1265

return false;

1266

}

1267

1268

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

1269

}

1270

1271

/*

1272

* This function determines if a network interface is running

1273

*/

1274

bool interface_is_running(const char *interface){

1275

struct ifreq ifr;

1276

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

1277

if(debug){

1278

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

1279

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

1280

}

1281

return false;

1282

}

1283

1284

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

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

1285

1237

}

1286

1238

1287

1239

int notdotentries(const struct dirent *direntry){

1349

1301

}

1350

1302

return 0;

1351

1303

}

1352

if(debug){

1353

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

1354

direntry->d_name);

1355

}

1356

1304

return 1;

1357

1305

}

1358

1306

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

mandos_context *mc){

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1361

1308

int ret;

1362

1309

struct timespec now;

1363

1310

struct timespec waited_time;

1364

1311

intmax_t block_time;

1365

1312

1366

1313

while(true){

1367

if(mc->current_server == NULL){

1314

if(mc.current_server == NULL){

1368

1315

if (debug){

1369

1316

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

1370

1317

" No timeout!\n");

1384

1331

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

1385

1332

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

1386

1333

waited_time.tv_sec = (now.tv_sec

1387

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

1334

- mc.current_server->last_seen.tv_sec);

1388

1335

waited_time.tv_nsec = (now.tv_nsec

1389

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

1336

- mc.current_server->last_seen.tv_nsec);

1390

1337

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

1391

1338

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

1392

1339

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

1400

1347

}

1401

1348

1402

1349

if(block_time <= 0){

1403

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

1404

mc->current_server->port,

1405

mc->current_server->if_index,

1406

mc->current_server->af, mc);

1350

ret = start_mandos_communication(mc.current_server->ip,

1351

mc.current_server->port,

1352

mc.current_server->if_index,

1353

mc.current_server->af);

1407

1354

if(ret == 0){

1408

avahi_simple_poll_quit(s);

1355

avahi_simple_poll_quit(mc.simple_poll);

1409

1356

return 0;

1410

1357

}

1411

1358

ret = clock_gettime(CLOCK_MONOTONIC,

1412

&mc->current_server->last_seen);

1359

&mc.current_server->last_seen);

1413

1360

if(ret == -1){

1414

1361

perror_plus("clock_gettime");

1415

1362

return -1;

1416

1363

}

1417

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

1364

mc.current_server = mc.current_server->next;

1418

1365

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

1419

1366

servers, but don't block */

1420

1367

}

1429

1376

}

1430

1377

}

1431

1378

1432

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

1433

error_t raise_privileges(void){

1434

error_t old_errno = errno;

1435

error_t ret_errno = 0;

1436

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

1437

ret_errno = errno;

1438

perror_plus("seteuid");

1439

}

1440

errno = old_errno;

1441

return ret_errno;

1442

}

1443

1444

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

1445

error_t raise_privileges_permanently(void){

1446

error_t old_errno = errno;

1447

error_t ret_errno = raise_privileges();

1448

if(ret_errno != 0){

1449

errno = old_errno;

1450

return ret_errno;

1451

}

1452

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

1453

ret_errno = errno;

1454

perror_plus("seteuid");

1455

}

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

1460

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

1461

error_t lower_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

/* Lower privileges permanently */

1473

error_t lower_privileges_permanently(void){

1474

error_t old_errno = errno;

1475

error_t ret_errno = 0;

1476

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

1477

ret_errno = errno;

1478

perror_plus("setuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

1379

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

1485

1380

const float delay){

1486

1381

struct dirent **direntries;

1489

1384

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

1490

1385

alphasort);

1491

1386

if(numhooks == -1){

1492

if(errno == ENOENT){

1493

if(debug){

1494

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

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

1499

}

1387

perror_plus("scandir");

1500

1388

} else {

1501

1389

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

1502

1390

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

1514

1402

pid_t hook_pid = fork();

1515

1403

if(hook_pid == 0){

1516

1404

/* Child */

1517

/* Raise privileges */

1518

raise_privileges_permanently();

1519

/* Set group */

1520

errno = 0;

1521

ret = setgid(0);

1522

if(ret == -1){

1523

perror_plus("setgid");

1524

}

1525

/* Reset supplementary groups */

1526

errno = 0;

1527

ret = setgroups(0, NULL);

1528

if(ret == -1){

1529

perror_plus("setgroups");

1530

}

1531

1405

dup2(devnull, STDIN_FILENO);

1532

1406

close(devnull);

1533

1407

dup2(STDERR_FILENO, STDOUT_FILENO);

1534

1408

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

1535

1409

if(ret == -1){

1536

1410

perror_plus("setenv");

1537

_exit(EX_OSERR);

1411

return false;

1538

1412

}

1539

1413

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

1540

1414

if(ret == -1){

1541

1415

perror_plus("setenv");

1542

_exit(EX_OSERR);

1416

return false;

1543

1417

}

1544

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

1418

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

1545

1419

if(ret == -1){

1546

1420

perror_plus("setenv");

1547

_exit(EX_OSERR);

1421

return false;

1548

1422

}

1549

1423

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

1550

1424

if(ret == -1){

1551

1425

perror_plus("setenv");

1552

_exit(EX_OSERR);

1426

return false;

1553

1427

}

1554

1428

char *delaystring;

1555

1429

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

1556

1430

if(ret == -1){

1557

1431

perror_plus("asprintf");

1558

_exit(EX_OSERR);

1432

return false;

1559

1433

}

1560

1434

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

1561

1435

if(ret == -1){

1562

1436

free(delaystring);

1563

1437

perror_plus("setenv");

1564

_exit(EX_OSERR);

1438

return false;

1565

1439

}

1566

1440

free(delaystring);

1567

if(connect_to != NULL){

1568

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

1569

if(ret == -1){

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1573

}

1574

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

1575

perror_plus("execl");

1576

_exit(EXIT_FAILURE);

1577

}

1441

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

1442

perror_plus("execl");

1578

1443

} else {

1579

1444

int status;

1580

1445

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

1604

1469

}

1605

1470

}

1606

1471

free(fullname);

1607

if(debug){

1608

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

1609

direntry->d_name);

1472

if(quit_now){

1473

break;

1610

1474

}

1611

1475

}

1612

1476

close(devnull);

1614

1478

return true;

1615

1479

}

1616

1480

1617

error_t bring_up_interface(const char *const interface,

1618

const float delay){

1619

int sd = -1;

1620

error_t old_errno = errno;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1623

struct ifreq network;

1624

unsigned int if_index = if_nametoindex(interface);

1625

if(if_index == 0){

1626

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

1627

errno = old_errno;

1628

return ENXIO;

1629

}

1630

1631

if(quit_now){

1632

errno = old_errno;

1633

return EINTR;

1634

}

1635

1636

if(not interface_is_up(interface)){

1637

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

1638

ret_errno = errno;

1639

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

1640

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

1641

return ret_errno;

1642

}

1643

network.ifr_flags |= IFF_UP;

1644

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1647

ret_errno = errno;

1648

perror_plus("socket");

1649

errno = old_errno;

1650

return ret_errno;

1651

}

1652

1653

if(quit_now){

1654

close(sd);

1655

errno = old_errno;

1656

return EINTR;

1657

}

1658

1659

if(debug){

1660

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

1661

interface);

1662

}

1663

1664

/* Raise priviliges */

1665

raise_privileges();

1666

1667

#ifdef __linux__

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

1675

}

1676

#endif /* __linux__ */

1677

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

1678

ret_errno = errno;

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret_linux = klogctl(7, NULL, 0);

1682

if(ret_linux == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

1688

/* Lower privileges */

1689

lower_privileges();

1690

1691

/* Close the socket */

1692

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

1693

if(ret == -1){

1694

perror_plus("close");

1695

}

1696

1697

if(ret_setflags == -1){

1698

errno = ret_errno;

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1700

errno = old_errno;

1701

return ret_errno;

1702

}

1703

} else if(debug){

1704

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

1705

interface);

1706

}

1707

1708

/* Sleep checking until interface is running.

1709

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

1710

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

1711

if(interface_is_running(interface)){

1712

break;

1713

}

1714

struct timespec sleeptime = { .tv_nsec = 250000000 };

1715

ret = nanosleep(&sleeptime, NULL);

1716

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

1717

perror_plus("nanosleep");

1718

}

1719

}

1720

1721

errno = old_errno;

1722

return 0;

1723

}

1724

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1730

struct ifreq network;

1731

unsigned int if_index = if_nametoindex(interface);

1732

if(if_index == 0){

1733

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

1734

errno = old_errno;

1735

return ENXIO;

1736

}

1737

if(interface_is_up(interface)){

1738

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

1739

ret_errno = errno;

1740

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

1741

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

1742

return ret_errno;

1743

}

1744

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

1745

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1748

ret_errno = errno;

1749

perror_plus("socket");

1750

errno = old_errno;

1751

return ret_errno;

1752

}

1753

1754

if(debug){

1755

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

1756

interface);

1757

}

1758

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

1767

1768

/* Close the socket */

1769

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

1770

if(ret == -1){

1771

perror_plus("close");

1772

}

1773

1774

if(ret_setflags == -1){

1775

errno = ret_errno;

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1777

errno = old_errno;

1778

return ret_errno;

1779

}

1780

} else if(debug){

1781

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

1782

interface);

1783

}

1784

1785

errno = old_errno;

1786

return 0;

1787

}

1788

1789

1481

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

1790

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

1791

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

1792

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

1793

.interfaces = NULL, .interfaces_size = 0 };

1794

1482

AvahiSServiceBrowser *sb = NULL;

1795

error_t ret_errno;

1483

int error;

1796

1484

int ret;

1797

1485

intmax_t tmpmax;

1798

1486

char *tmp;

1799

1487

int exitcode = EXIT_SUCCESS;

1800

char *interfaces_to_take_down = NULL;

1801

size_t interfaces_to_take_down_size = 0;

1488

const char *interface = "";

1489

struct ifreq network;

1490

int sd = -1;

1491

bool take_down_interface = false;

1492

uid_t uid;

1493

gid_t gid;

1802

1494

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

1803

1495

bool tempdir_created = false;

1804

1496

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1805

1497

const char *seckey = PATHDIR "/" SECKEY;

1806

1498

const char *pubkey = PATHDIR "/" PUBKEY;

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1809

1499

1810

1500

bool gnutls_initialized = false;

1811

1501

bool gpgme_initialized = false;

1873

1563

.group = 2 },

1874

1564

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

1875

1565

.arg = "SECONDS",

1876

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

1566

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

1877

1567

.group = 2 },

1878

1568

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

1879

1569

.arg = "DIR",

1902

1592

connect_to = arg;

1903

1593

break;

1904

1594

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

1905

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

1906

arg, (int)',');

1907

if(ret_errno != 0){

1908

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

1909

}

1595

interface = arg;

1910

1596

break;

1911

1597

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

1912

1598

seckey = arg;

1955

1641

argp_state_help(state, state->out_stream,

1956

1642

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1957

1643

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

1644

fprintf_plus(state->out_stream,

1645

"Mandos plugin mandos-client: ");

1958

1646

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

1959

1647

exit(argp_err_exit_status);

1960

1648

break;

1985

1673

}

1986

1674

}

1987

1675

1988

{

1676

if(getuid() == 0){

1989

1677

/* Work around Debian bug #633582:

1990

1678

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

1679

struct stat st;

1991

1680

1992

1681

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

1994

struct stat st;

1995

1996

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

1997

int seckey_fd = open(seckey, O_RDONLY);

1998

if(seckey_fd == -1){

1999

perror_plus("open");

2000

} else {

2001

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

2002

if(ret == -1){

2003

perror_plus("fstat");

2004

} else {

2005

if(S_ISREG(st.st_mode)

2006

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

2007

ret = fchown(seckey_fd, uid, gid);

2008

if(ret == -1){

2009

perror_plus("fchown");

2010

}

2011

}

2012

}

2013

TEMP_FAILURE_RETRY(close(seckey_fd));

2014

}

2015

}

2016

2017

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

2018

int pubkey_fd = open(pubkey, O_RDONLY);

2019

if(pubkey_fd == -1){

2020

perror_plus("open");

2021

} else {

2022

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

2023

if(ret == -1){

2024

perror_plus("fstat");

2025

} else {

2026

if(S_ISREG(st.st_mode)

2027

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

2028

ret = fchown(pubkey_fd, uid, gid);

2029

if(ret == -1){

2030

perror_plus("fchown");

2031

}

2032

}

2033

}

2034

TEMP_FAILURE_RETRY(close(pubkey_fd));

2035

}

2036

}

2037

2038

/* Lower privileges */

2039

lower_privileges();

2040

}

2041

}

2042

2043

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

2044

{

2045

char *interface = NULL;

2046

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

2047

interface))){

2048

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

2049

and if_nametoindex(interface) == 0){

2050

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

2051

fprintf_plus(stderr, "Not using nonexisting interface"

2052

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

2053

}

2054

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

2055

interface = NULL;

2056

}

1682

errno = 0;

1683

ret = seteuid(0);

1684

if(ret == -1){

1685

perror_plus("seteuid");

1686

}

1687

1688

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

1689

int seckey_fd = open(seckey, O_RDONLY);

1690

if(seckey_fd == -1){

1691

perror_plus("open");

1692

} else {

1693

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

1694

if(ret == -1){

1695

perror_plus("fstat");

1696

} else {

1697

if(S_ISREG(st.st_mode)

1698

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

1699

ret = fchown(seckey_fd, uid, gid);

1700

if(ret == -1){

1701

perror_plus("fchown");

1702

}

1703

}

1704

}

1705

TEMP_FAILURE_RETRY(close(seckey_fd));

1706

}

1707

}

1708

1709

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

1710

int pubkey_fd = open(pubkey, O_RDONLY);

1711

if(pubkey_fd == -1){

1712

perror_plus("open");

1713

} else {

1714

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

1715

if(ret == -1){

1716

perror_plus("fstat");

1717

} else {

1718

if(S_ISREG(st.st_mode)

1719

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

1720

ret = fchown(pubkey_fd, uid, gid);

1721

if(ret == -1){

1722

perror_plus("fchown");

1723

}

1724

}

1725

}

1726

TEMP_FAILURE_RETRY(close(pubkey_fd));

1727

}

1728

}

1729

1730

/* Lower privileges */

1731

errno = 0;

1732

ret = seteuid(uid);

1733

if(ret == -1){

1734

perror_plus("seteuid");

2057

1735

}

2058

1736

}

2059

1737

2060

1738

/* Run network hooks */

2061

1739

{

2062

if(mc.interfaces != NULL){

2063

interfaces_hooks = malloc(mc.interfaces_size);

2064

if(interfaces_hooks == NULL){

2065

perror_plus("malloc");

2066

goto end;

1740

if(getuid() == 0){

1741

/* Re-raise priviliges */

1742

errno = 0;

1743

ret = seteuid(0);

1744

if(ret == -1){

1745

perror_plus("seteuid");

2067

1746

}

2068

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

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

1747

}

2073

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

2074

interfaces_hooks : "", delay)){

1748

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

2075

1749

goto end;

2076

1750

}

1751

if(getuid() == 0){

1752

/* Lower privileges */

1753

errno = 0;

1754

ret = seteuid(uid);

1755

if(ret == -1){

1756

perror_plus("seteuid");

1757

}

1758

}

2077

1759

}

2078

1760

2079

1761

if(not debug){

2080

1762

avahi_set_log_function(empty_log);

2081

1763

}

2082

1764

1765

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

1766

struct dirent **direntries;

1767

/* First look for interfaces that are up */

1768

ret = scandir(sys_class_net, &direntries, up_interface,

1769

alphasort);

1770

if(ret == 0){

1771

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

1772

free(direntries);

1773

ret = scandir(sys_class_net, &direntries, good_interface,

1774

alphasort);

1775

}

1776

if(ret >= 1){

1777

/* Pick the first interface returned */

1778

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

1779

if(debug){

1780

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

1781

}

1782

if(interface == NULL){

1783

perror_plus("malloc");

1784

free(direntries);

1785

exitcode = EXIT_FAILURE;

1786

goto end;

1787

}

1788

free(direntries);

1789

} else {

1790

free(direntries);

1791

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

1792

exitcode = EXIT_FAILURE;

1793

goto end;

1794

}

1795

}

1796

2083

1797

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

2084

1798

from the signal handler */

2085

1799

/* Initialize the pseudo-RNG for Avahi */

2086

1800

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

2087

simple_poll = avahi_simple_poll_new();

2088

if(simple_poll == NULL){

1801

mc.simple_poll = avahi_simple_poll_new();

1802

if(mc.simple_poll == NULL){

2089

1803

fprintf_plus(stderr,

2090

1804

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

2091

1805

exitcode = EX_UNAVAILABLE;

2155

1869

}

2156

1870

}

2157

1871

2158

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

2159

if(mc.interfaces == NULL){

2160

struct dirent **direntries;

2161

/* Look for any good interfaces */

2162

ret = scandir(sys_class_net, &direntries, good_interface,

2163

alphasort);

2164

if(ret >= 1){

2165

/* Add all found interfaces to interfaces list */

2166

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

2167

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

2168

direntries[i]->d_name);

2169

if(ret_errno != 0){

2170

perror_plus("argz_add");

2171

continue;

2172

}

2173

if(debug){

2174

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

2175

direntries[i]->d_name);

2176

}

2177

}

2178

free(direntries);

2179

} else {

2180

free(direntries);

2181

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

2182

exitcode = EXIT_FAILURE;

2183

goto end;

2184

}

2185

}

2186

2187

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

2188

{

2189

char *interface = NULL;

2190

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

2191

interface))){

2192

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

2193

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

2194

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

2195

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

2196

interface);

2197

interface = NULL;

2198

while((interface = argz_next(mc.interfaces,

2199

mc.interfaces_size, interface))){

2200

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

2201

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

2202

interface);

2203

interface = NULL;

1872

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

1873

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

1874

if_index = (AvahiIfIndex) if_nametoindex(interface);

1875

if(if_index == 0){

1876

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

1877

exitcode = EX_UNAVAILABLE;

1878

goto end;

1879

}

1880

1881

if(quit_now){

1882

goto end;

1883

}

1884

1885

/* Re-raise priviliges */

1886

errno = 0;

1887

ret = seteuid(0);

1888

if(ret == -1){

1889

perror_plus("seteuid");

1890

}

1891

1892

#ifdef __linux__

1893

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1894

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

1895

ret = klogctl(8, NULL, 5);

1896

bool restore_loglevel = true;

1897

if(ret == -1){

1898

restore_loglevel = false;

1899

perror_plus("klogctl");

1900

}

1901

#endif /* __linux__ */

1902

1903

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1904

if(sd < 0){

1905

perror_plus("socket");

1906

exitcode = EX_OSERR;

1907

#ifdef __linux__

1908

if(restore_loglevel){

1909

ret = klogctl(7, NULL, 0);

1910

if(ret == -1){

1911

perror_plus("klogctl");

1912

}

1913

}

1914

#endif /* __linux__ */

1915

/* Lower privileges */

1916

errno = 0;

1917

ret = seteuid(uid);

1918

if(ret == -1){

1919

perror_plus("seteuid");

1920

}

1921

goto end;

1922

}

1923

strcpy(network.ifr_name, interface);

1924

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

1925

if(ret == -1){

1926

perror_plus("ioctl SIOCGIFFLAGS");

1927

#ifdef __linux__

1928

if(restore_loglevel){

1929

ret = klogctl(7, NULL, 0);

1930

if(ret == -1){

1931

perror_plus("klogctl");

1932

}

1933

}

1934

#endif /* __linux__ */

1935

exitcode = EX_OSERR;

1936

/* Lower privileges */

1937

errno = 0;

1938

ret = seteuid(uid);

1939

if(ret == -1){

1940

perror_plus("seteuid");

1941

}

1942

goto end;

1943

}

1944

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

1945

network.ifr_flags |= IFF_UP;

1946

take_down_interface = true;

1947

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

1948

if(ret == -1){

1949

take_down_interface = false;

1950

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1951

exitcode = EX_OSERR;

1952

#ifdef __linux__

1953

if(restore_loglevel){

1954

ret = klogctl(7, NULL, 0);

1955

if(ret == -1){

1956

perror_plus("klogctl");

2204

1957

}

2205

1958

}

1959

#endif /* __linux__ */

1960

/* Lower privileges */

1961

errno = 0;

1962

ret = seteuid(uid);

1963

if(ret == -1){

1964

perror_plus("seteuid");

1965

}

1966

goto end;

1967

}

1968

}

1969

/* Sleep checking until interface is running.

1970

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

1971

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

1972

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

1973

if(ret == -1){

1974

perror_plus("ioctl SIOCGIFFLAGS");

1975

} else if(network.ifr_flags & IFF_RUNNING){

2206

1976

break;

2207

1977

}

2208

bool interface_was_up = interface_is_up(interface);

2209

ret = bring_up_interface(interface, delay);

2210

if(not interface_was_up){

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2214

} else {

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2218

}

2219

}

2220

}

2221

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

2222

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

2223

}

2224

}

2225

2226

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

2227

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

2228

if(debug){

2229

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

2230

mc.interfaces);

2231

}

2232

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

1978

struct timespec sleeptime = { .tv_nsec = 250000000 };

1979

ret = nanosleep(&sleeptime, NULL);

1980

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

1981

perror_plus("nanosleep");

1982

}

1983

}

1984

if(not take_down_interface){

1985

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

1986

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

1987

if(ret == -1){

1988

perror_plus("close");

1989

}

1990

}

1991

#ifdef __linux__

1992

if(restore_loglevel){

1993

/* Restores kernel loglevel to default */

1994

ret = klogctl(7, NULL, 0);

1995

if(ret == -1){

1996

perror_plus("klogctl");

1997

}

1998

}

1999

#endif /* __linux__ */

2000

/* Lower privileges */

2001

errno = 0;

2002

/* Lower privileges */

2003

ret = seteuid(uid);

2004

if(ret == -1){

2005

perror_plus("seteuid");

2006

}

2233

2007

}

2234

2008

2235

2009

if(quit_now){

2236

2010

goto end;

2237

2011

}

2238

2012

2239

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

2013

ret = init_gnutls_global(pubkey, seckey);

2240

2014

if(ret == -1){

2241

2015

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

2242

2016

exitcode = EX_UNAVAILABLE;

2259

2033

goto end;

2260

2034

}

2261

2035

2262

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

2036

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

2263

2037

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

2264

2038

exitcode = EX_UNAVAILABLE;

2265

2039

goto end;

2275

2049

/* Connect directly, do not use Zeroconf */

2276

2050

/* (Mainly meant for debugging) */

2277

2051

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

2278

2279

2052

if(address == NULL){

2280

2053

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

2281

2054

exitcode = EX_USAGE;

2286

2059

goto end;

2287

2060

}

2288

2061

2289

in_port_t port;

2062

uint16_t port;

2290

2063

errno = 0;

2291

2064

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

2292

2065

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

2293

or tmpmax != (in_port_t)tmpmax){

2066

or tmpmax != (uint16_t)tmpmax){

2294

2067

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

2295

2068

exitcode = EX_USAGE;

2296

2069

goto end;

2297

2070

}

2298

2071

2299

2072

if(quit_now){

2300

2073

goto end;

2301

2074

}

2302

2075

2303

port = (in_port_t)tmpmax;

2076

port = (uint16_t)tmpmax;

2304

2077

*address = '\0';

2305

2078

/* Colon in address indicates IPv6 */

2306

2079

int af;

2322

2095

}

2323

2096

2324

2097

while(not quit_now){

2325

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

2326

&mc);

2098

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

2327

2099

if(quit_now or ret == 0){

2328

2100

break;

2329

2101

}

2331

2103

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

2332

2104

(int)retry_interval);

2333

2105

}

2334

sleep((unsigned int)retry_interval);

2106

sleep((int)retry_interval);

2335

2107

}

2336

2108

2337

2109

if (not quit_now){

2355

2127

config.publish_domain = 0;

2356

2128

2357

2129

/* Allocate a new server */

2358

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2359

&config, NULL, NULL, &ret_errno);

2130

mc.server = avahi_server_new(avahi_simple_poll_get

2131

(mc.simple_poll), &config, NULL,

2132

NULL, &error);

2360

2133

2361

2134

/* Free the Avahi configuration data */

2362

2135

avahi_server_config_free(&config);

2365

2138

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

2366

2139

if(mc.server == NULL){

2367

2140

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

2368

avahi_strerror(ret_errno));

2141

avahi_strerror(error));

2369

2142

exitcode = EX_UNAVAILABLE;

2370

2143

goto end;

2371

2144

}

2377

2150

/* Create the Avahi service browser */

2378

2151

sb = avahi_s_service_browser_new(mc.server, if_index,

2379

2152

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2380

NULL, 0, browse_callback,

2381

(void *)&mc);

2153

NULL, 0, browse_callback, NULL);

2382

2154

if(sb == NULL){

2383

2155

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

2384

2156

avahi_strerror(avahi_server_errno(mc.server)));

2396

2168

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

2397

2169

}

2398

2170

2399

ret = avahi_loop_with_timeout(simple_poll,

2400

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

2171

ret = avahi_loop_with_timeout(mc.simple_poll,

2172

(int)(retry_interval * 1000));

2401

2173

if(debug){

2402

2174

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

2403

2175

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

2410

2182

}

2411

2183

2412

2184

/* Cleanup things */

2413

free(mc.interfaces);

2414

2415

2185

if(sb != NULL)

2416

2186

avahi_s_service_browser_free(sb);

2417

2187

2418

2188

if(mc.server != NULL)

2419

2189

avahi_server_free(mc.server);

2420

2190

2421

if(simple_poll != NULL)

2422

avahi_simple_poll_free(simple_poll);

2191

if(mc.simple_poll != NULL)

2192

avahi_simple_poll_free(mc.simple_poll);

2423

2193

2424

2194

if(gnutls_initialized){

2425

2195

gnutls_certificate_free_credentials(mc.cred);

2430

2200

if(gpgme_initialized){

2431

2201

gpgme_release(mc.ctx);

2432

2202

}

2433

2203

2434

2204

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

2435

2205

has seen */

2436

2206

if(mc.current_server != NULL){

2444

2214

2445

2215

/* Re-raise priviliges */

2446

2216

{

2447

raise_privileges();

2448

2217

if(getuid() == 0){

2218

errno = 0;

2219

ret = seteuid(0);

2220

if(ret == -1){

2221

perror_plus("seteuid");

2222

}

2223

}

2449

2224

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2225

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

2226

goto end;

2227

}

2452

2228

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

2229

/* Take down the network interface */

2230

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

2231

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

2232

if(ret == -1){

2233

perror_plus("ioctl SIOCGIFFLAGS");

2234

} else if(network.ifr_flags & IFF_UP){

2235

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

2236

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

2237

if(ret == -1){

2238

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2463

2239

}

2464

2240

}

2465

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

2466

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

2467

" down\n");

2241

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

2242

if(ret == -1){

2243

perror_plus("close");

2468

2244

}

2469

2245

}

2470

2471

lower_privileges_permanently();

2472

}

2473

2474

free(interfaces_to_take_down);

2475

free(interfaces_hooks);

2246

}

2247

if(getuid() == 0){

2248

/* Lower privileges permanently */

2249

errno = 0;

2250

ret = setuid(uid);

2251

if(ret == -1){

2252

perror_plus("setuid");

2253

}

2254

}

2476

2255

2477

2256

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

2478

2257

if(tempdir_created){