/mandos/trunk : revision 505.3.17

9

* "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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65

#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 <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() */

138

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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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137

const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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138

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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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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

145

struct timespec last_seen;

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149

155

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

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typedef struct {

152

AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

159

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unsigned int dh_bits;

161

157

const char *priority;

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gpgme_ctx_t ctx;

163

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

166

160

} mandos_context;

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161

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/* 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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171

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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170

174

171

/* Function to use when printing errors */

175

172

void perror_plus(const char *print_text){

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int e = errno;

177

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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

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

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va_list ap;

186

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va_start (ap, format);

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181

188

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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));

184

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

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}

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/*

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}

209

203

210

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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;

214

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

215

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if(new_server == NULL){

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perror_plus("malloc");

217

return false;

211

return -1;

218

212

}

219

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

220

214

.port = port,

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.af = af };

223

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if(new_server->ip == NULL){

224

218

perror_plus("strdup");

225

return false;

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return -1;

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220

}

227

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/* Special case of first server */

228

if(*current_server == NULL){

222

if (mc.current_server == NULL){

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new_server->next = new_server;

230

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new_server->prev = new_server;

231

*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

227

} else {

234

new_server->next = *current_server;

235

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

228

new_server->next = mc.current_server;

229

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

236

230

new_server->prev->next = new_server;

237

(*current_server)->prev = new_server;

231

mc.current_server->prev = new_server;

238

232

}

239

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

233

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

240

234

if(ret == -1){

241

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perror_plus("clock_gettime");

242

return false;

236

return -1;

243

237

}

244

return true;

238

return 0;

245

239

}

246

240

247

241

/*

248

242

* Initialize GPGME.

249

243

*/

250

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

251

const char *tempdir, mandos_context *mc){

245

const char *tempdir){

252

246

gpgme_error_t rc;

253

247

gpgme_engine_info_t engine_info;

254

248

249

255

250

/*

256

251

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

257

252

*/

273

268

return false;

274

269

}

275

270

276

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

271

rc = gpgme_op_import(mc.ctx, pgp_data);

277

272

if(rc != GPG_ERR_NO_ERROR){

278

273

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

279

274

gpgme_strsource(rc), gpgme_strerror(rc));

323

318

}

324

319

325

320

/* Create new GPGME "context" */

326

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

321

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

327

322

if(rc != GPG_ERR_NO_ERROR){

328

323

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

329

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

344

339

*/

345

340

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

341

size_t crypto_size,

347

char **plaintext,

348

mandos_context *mc){

342

char **plaintext){

349

343

gpgme_data_t dh_crypto, dh_plain;

350

344

gpgme_error_t rc;

351

345

ssize_t ret;

377

371

378

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

379

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data buffer */

380

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

374

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

381

375

if(rc != GPG_ERR_NO_ERROR){

382

376

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

383

377

gpgme_strsource(rc), gpgme_strerror(rc));

384

378

plaintext_length = -1;

385

379

if(debug){

386

380

gpgme_decrypt_result_t result;

387

result = gpgme_op_decrypt_result(mc->ctx);

381

result = gpgme_op_decrypt_result(mc.ctx);

388

382

if(result == NULL){

389

383

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

390

384

} else {

468

462

}

469

463

470

464

static const char * safer_gnutls_strerror(int value){

471

const char *ret = gnutls_strerror(value);

465

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

466

-Wunreachable-code */

472

467

if(ret == NULL)

473

468

ret = "(unknown)";

474

469

return ret;

481

476

}

482

477

483

478

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename,

485

mandos_context *mc){

479

const char *seckeyfilename){

486

480

int ret;

487

481

488

482

if(debug){

505

499

}

506

500

507

501

/* OpenPGP credentials */

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

509

503

if(ret != GNUTLS_E_SUCCESS){

510

504

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

511

505

safer_gnutls_strerror(ret));

521

515

}

522

516

523

517

ret = gnutls_certificate_set_openpgp_key_file

524

(mc->cred, pubkeyfilename, seckeyfilename,

518

(mc.cred, pubkeyfilename, seckeyfilename,

525

519

GNUTLS_OPENPGP_FMT_BASE64);

526

520

if(ret != GNUTLS_E_SUCCESS){

527

521

fprintf_plus(stderr,

533

527

}

534

528

535

529

/* GnuTLS server initialization */

536

ret = gnutls_dh_params_init(&mc->dh_params);

530

ret = gnutls_dh_params_init(&mc.dh_params);

537

531

if(ret != GNUTLS_E_SUCCESS){

538

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

533

" initialization: %s\n",

540

534

safer_gnutls_strerror(ret));

541

535

goto globalfail;

542

536

}

543

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

537

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

544

538

if(ret != GNUTLS_E_SUCCESS){

545

539

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

546

540

safer_gnutls_strerror(ret));

547

541

goto globalfail;

548

542

}

549

543

550

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

544

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

551

545

552

546

return 0;

553

547

554

548

globalfail:

555

549

556

gnutls_certificate_free_credentials(mc->cred);

550

gnutls_certificate_free_credentials(mc.cred);

557

551

gnutls_global_deinit();

558

gnutls_dh_params_deinit(mc->dh_params);

552

gnutls_dh_params_deinit(mc.dh_params);

559

553

return -1;

560

554

}

561

555

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

556

static int init_gnutls_session(gnutls_session_t *session){

564

557

int ret;

565

558

/* GnuTLS session creation */

566

559

do {

578

571

{

579

572

const char *err;

580

573

do {

581

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

574

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

582

575

if(quit_now){

583

576

gnutls_deinit(*session);

584

577

return -1;

595

588

596

589

do {

597

590

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc->cred);

591

mc.cred);

599

592

if(quit_now){

600

593

gnutls_deinit(*session);

601

594

return -1;

611

604

/* ignore client certificate if any. */

612

605

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

606

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

615

608

616

609

return 0;

617

610

}

621

614

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

622

615

623

616

/* Called when a Mandos server is found */

624

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

617

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

625

618

AvahiIfIndex if_index,

626

int af, mandos_context *mc){

619

int af){

627

620

int ret, tcp_sd = -1;

628

621

ssize_t sret;

629

622

union {

659

652

return -1;

660

653

}

661

654

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);

655

ret = init_gnutls_session(&session);

695

656

if(ret != 0){

696

657

return -1;

697

658

}

698

659

699

660

if(debug){

700

661

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

701

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

662

PRIu16 "\n", ip, port);

702

663

}

703

664

704

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

735

696

goto mandos_end;

736

697

}

737

698

if(af == AF_INET6){

738

to.in6.sin6_port = htons(port);

739

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

699

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

700

-Wconversion and

701

-Wunreachable-code */

702

743

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

744

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

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

704

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

705

-Wunreachable-code*/

748

706

if(if_index == AVAHI_IF_UNSPEC){

749

707

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

750

708

" incomplete without a network interface\n");

755

713

to.in6.sin6_scope_id = (uint32_t)if_index;

756

714

}

757

715

} else {

758

to.in.sin_port = htons(port);

716

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

717

-Wconversion and

718

-Wunreachable-code */

759

719

}

760

720

761

721

if(quit_now){

769

729

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

770

730

perror_plus("if_indextoname");

771

731

} else {

772

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

773

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

732

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

733

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

774

734

}

775

735

} else {

776

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

777

ip, (uintmax_t)port);

736

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

737

ip, port);

778

738

}

779

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

780

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

858

818

goto mandos_end;

859

819

}

860

820

861

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

862

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

863

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

864

gnutls_transport_set_ptr(session,

865

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

821

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

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

866

823

867

824

if(quit_now){

868

825

errno = EINTR;

973

930

if(buffer_length > 0){

974

931

ssize_t decrypted_buffer_size;

975

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

976

&decrypted_buffer, mc);

933

&decrypted_buffer);

977

934

if(decrypted_buffer_size >= 0){

978

935

979

936

written = 0;

1040

997

AVAHI_GCC_UNUSED AvahiStringList *txt,

1041

998

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1042

999

flags,

1043

void* mc){

1044

if(r == NULL){

1045

return;

1046

}

1000

AVAHI_GCC_UNUSED void* userdata){

1001

assert(r);

1047

1002

1048

1003

/* Called whenever a service has been resolved successfully or

1049

1004

timed out */

1058

1013

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

1059

1014

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

1060

1015

domain,

1061

avahi_strerror(avahi_server_errno

1062

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

1016

avahi_strerror(avahi_server_errno(mc.server)));

1063

1017

break;

1064

1018

1065

1019

case AVAHI_RESOLVER_FOUND:

1071

1025

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

1072

1026

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

1073

1027

}

1074

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

1075

interface,

1076

avahi_proto_to_af(proto),

1077

mc);

1028

int ret = start_mandos_communication(ip, port, interface,

1029

avahi_proto_to_af(proto));

1078

1030

if(ret == 0){

1079

avahi_simple_poll_quit(simple_poll);

1031

avahi_simple_poll_quit(mc.simple_poll);

1080

1032

} else {

1081

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

1082

avahi_proto_to_af(proto),

1083

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

1084

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

1085

" list\n", name);

1086

}

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

1087

1035

}

1088

1036

}

1089

1037

}

1099

1047

const char *domain,

1100

1048

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1101

1049

flags,

1102

void* mc){

1103

if(b == NULL){

1104

return;

1105

}

1050

AVAHI_GCC_UNUSED void* userdata){

1051

assert(b);

1106

1052

1107

1053

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

1108

1054

is removed from the LAN */

1116

1062

case AVAHI_BROWSER_FAILURE:

1117

1063

1118

1064

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

1119

avahi_strerror(avahi_server_errno

1120

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

1121

avahi_simple_poll_quit(simple_poll);

1065

avahi_strerror(avahi_server_errno(mc.server)));

1066

avahi_simple_poll_quit(mc.simple_poll);

1122

1067

return;

1123

1068

1124

1069

case AVAHI_BROWSER_NEW:

1127

1072

the callback function is called the Avahi server will free the

1128

1073

resolver for us. */

1129

1074

1130

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

1131

interface, protocol, name, type,

1132

domain, protocol, 0,

1133

resolve_callback, mc) == NULL)

1075

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

1076

name, type, domain, protocol, 0,

1077

resolve_callback, NULL) == NULL)

1134

1078

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

1135

1079

" %s\n", name,

1136

avahi_strerror(avahi_server_errno

1137

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1138

1081

break;

1139

1082

1140

1083

case AVAHI_BROWSER_REMOVE:

1159

1102

signal_received = sig;

1160

1103

int old_errno = errno;

1161

1104

/* set main loop to exit */

1162

if(simple_poll != NULL){

1163

avahi_simple_poll_quit(simple_poll);

1105

if(mc.simple_poll != NULL){

1106

avahi_simple_poll_quit(mc.simple_poll);

1164

1107

}

1165

1108

errno = old_errno;

1166

1109

}

1167

1110

1168

1111

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

1169

1112

int ret;

1170

error_t ret_errno;

1171

1113

1172

1114

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

1173

1115

if(s < 0){

1174

ret_errno = errno;

1175

1116

perror_plus("socket");

1176

errno = ret_errno;

1177

1117

return false;

1178

1118

}

1179

1119

strcpy(ifr->ifr_name, ifname);

1180

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1181

1121

if(ret == -1){

1182

1122

if(debug){

1183

ret_errno = errno;

1184

1123

perror_plus("ioctl SIOCGIFFLAGS");

1185

errno = ret_errno;

1186

1124

}

1187

1125

return false;

1188

1126

}

1257

1195

}

1258

1196

1259

1197

/*

1260

* This function determines if a network interface is up.

1261

*/

1262

bool interface_is_up(const char *interface){

1263

struct ifreq ifr;

1264

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

1265

if(debug){

1266

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

1267

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

1268

}

1269

return false;

1270

}

1271

1272

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

1273

}

1274

1275

/*

1276

* This function determines if a network interface is running

1277

*/

1278

bool interface_is_running(const char *interface){

1279

struct ifreq ifr;

1280

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

1281

if(debug){

1282

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

1283

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

1284

}

1285

return false;

1286

}

1287

1288

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

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1236

}

1237

return 1;

1289

1238

}

1290

1239

1291

1240

int notdotentries(const struct dirent *direntry){

1360

1309

return 1;

1361

1310

}

1362

1311

1363

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1364

mandos_context *mc){

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1365

1313

int ret;

1366

1314

struct timespec now;

1367

1315

struct timespec waited_time;

1368

1316

intmax_t block_time;

1369

1317

1370

1318

while(true){

1371

if(mc->current_server == NULL){

1319

if(mc.current_server == NULL){

1372

1320

if (debug){

1373

1321

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

1374

1322

" No timeout!\n");

1388

1336

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

1389

1337

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

1390

1338

waited_time.tv_sec = (now.tv_sec

1391

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

1339

- mc.current_server->last_seen.tv_sec);

1392

1340

waited_time.tv_nsec = (now.tv_nsec

1393

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

1341

- mc.current_server->last_seen.tv_nsec);

1394

1342

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

1395

1343

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

1396

1344

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

1404

1352

}

1405

1353

1406

1354

if(block_time <= 0){

1407

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

1408

mc->current_server->port,

1409

mc->current_server->if_index,

1410

mc->current_server->af, mc);

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1411

1359

if(ret == 0){

1412

avahi_simple_poll_quit(s);

1360

avahi_simple_poll_quit(mc.simple_poll);

1413

1361

return 0;

1414

1362

}

1415

1363

ret = clock_gettime(CLOCK_MONOTONIC,

1416

&mc->current_server->last_seen);

1364

&mc.current_server->last_seen);

1417

1365

if(ret == -1){

1418

1366

perror_plus("clock_gettime");

1419

1367

return -1;

1420

1368

}

1421

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

1369

mc.current_server = mc.current_server->next;

1422

1370

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

1423

1371

servers, but don't block */

1424

1372

}

1433

1381

}

1434

1382

}

1435

1383

1436

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

1437

error_t raise_privileges(void){

1438

error_t old_errno = errno;

1439

error_t ret_errno = 0;

1440

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

1441

ret_errno = errno;

1442

perror_plus("seteuid");

1443

}

1444

errno = old_errno;

1445

return ret_errno;

1446

}

1447

1448

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

1449

error_t raise_privileges_permanently(void){

1450

error_t old_errno = errno;

1451

error_t ret_errno = raise_privileges();

1452

if(ret_errno != 0){

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

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

1457

ret_errno = errno;

1458

perror_plus("seteuid");

1459

}

1460

errno = old_errno;

1461

return ret_errno;

1462

}

1463

1464

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

1465

error_t lower_privileges(void){

1466

error_t old_errno = errno;

1467

error_t ret_errno = 0;

1468

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

1469

ret_errno = errno;

1470

perror_plus("seteuid");

1471

}

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

1476

/* Lower privileges permanently */

1477

error_t lower_privileges_permanently(void){

1478

error_t old_errno = errno;

1479

error_t ret_errno = 0;

1480

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

1481

ret_errno = errno;

1482

perror_plus("setuid");

1483

}

1484

errno = old_errno;

1485

return ret_errno;

1486

}

1487

1488

1384

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

1489

1385

const float delay){

1490

1386

struct dirent **direntries;

1493

1389

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

1494

1390

alphasort);

1495

1391

if(numhooks == -1){

1496

if(errno == ENOENT){

1497

if(debug){

1498

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

1499

" found\n", hookdir);

1500

}

1501

} else {

1502

perror_plus("scandir");

1503

}

1392

perror_plus("scandir");

1504

1393

} else {

1505

1394

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

1506

1395

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

1519

1408

if(hook_pid == 0){

1520

1409

/* Child */

1521

1410

/* Raise privileges */

1522

raise_privileges_permanently();

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1523

1422

/* Set group */

1524

1423

errno = 0;

1525

1424

ret = setgid(0);

1532

1431

if(ret == -1){

1533

1432

perror_plus("setgroups");

1534

1433

}

1434

fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());

1435

fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());

1535

1436

dup2(devnull, STDIN_FILENO);

1536

1437

close(devnull);

1537

1438

dup2(STDERR_FILENO, STDOUT_FILENO);

1545

1446

perror_plus("setenv");

1546

1447

_exit(EX_OSERR);

1547

1448

}

1548

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

1449

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

1549

1450

if(ret == -1){

1550

1451

perror_plus("setenv");

1551

1452

_exit(EX_OSERR);

1568

1469

_exit(EX_OSERR);

1569

1470

}

1570

1471

free(delaystring);

1571

if(connect_to != NULL){

1572

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

1573

if(ret == -1){

1574

perror_plus("setenv");

1575

_exit(EX_OSERR);

1576

}

1577

}

1578

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

1579

perror_plus("execl");

1580

_exit(EXIT_FAILURE);

1581

}

1472

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

1473

perror_plus("execl");

1582

1474

} else {

1583

1475

int status;

1584

1476

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

1618

1510

return true;

1619

1511

}

1620

1512

1621

error_t bring_up_interface(const char *const interface,

1622

const float delay){

1623

int sd = -1;

1624

error_t old_errno = errno;

1625

error_t ret_errno = 0;

1626

int ret, ret_setflags;

1627

struct ifreq network;

1628

unsigned int if_index = if_nametoindex(interface);

1629

if(if_index == 0){

1630

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

1631

errno = old_errno;

1632

return ENXIO;

1633

}

1634

1635

if(quit_now){

1636

errno = old_errno;

1637

return EINTR;

1638

}

1639

1640

if(not interface_is_up(interface)){

1641

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

1642

ret_errno = errno;

1643

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

1644

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

1645

return ret_errno;

1646

}

1647

network.ifr_flags |= IFF_UP;

1648

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1651

ret_errno = errno;

1652

perror_plus("socket");

1653

errno = old_errno;

1654

return ret_errno;

1655

}

1656

1657

if(quit_now){

1658

close(sd);

1659

errno = old_errno;

1660

return EINTR;

1661

}

1662

1663

if(debug){

1664

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

1665

interface);

1666

}

1667

1668

/* Raise priviliges */

1669

raise_privileges();

1670

1671

#ifdef __linux__

1672

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1673

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

1674

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

1675

bool restore_loglevel = true;

1676

if(ret_linux == -1){

1677

restore_loglevel = false;

1678

perror_plus("klogctl");

1679

}

1680

#endif /* __linux__ */

1681

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

1682

ret_errno = errno;

1683

#ifdef __linux__

1684

if(restore_loglevel){

1685

ret_linux = klogctl(7, NULL, 0);

1686

if(ret_linux == -1){

1687

perror_plus("klogctl");

1688

}

1689

}

1690

#endif /* __linux__ */

1691

1692

/* Lower privileges */

1693

lower_privileges();

1694

1695

/* Close the socket */

1696

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

1697

if(ret == -1){

1698

perror_plus("close");

1699

}

1700

1701

if(ret_setflags == -1){

1702

errno = ret_errno;

1703

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1704

errno = old_errno;

1705

return ret_errno;

1706

}

1707

} else if(debug){

1708

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

1709

interface);

1710

}

1711

1712

/* Sleep checking until interface is running.

1713

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

1714

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

1715

if(interface_is_running(interface)){

1716

break;

1717

}

1718

struct timespec sleeptime = { .tv_nsec = 250000000 };

1719

ret = nanosleep(&sleeptime, NULL);

1720

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

1721

perror_plus("nanosleep");

1722

}

1723

}

1724

1725

errno = old_errno;

1726

return 0;

1727

}

1728

1729

error_t take_down_interface(const char *const interface){

1730

int sd = -1;

1731

error_t old_errno = errno;

1732

error_t ret_errno = 0;

1733

int ret, ret_setflags;

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

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

1743

ret_errno = errno;

1744

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

1745

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

1746

return ret_errno;

1747

}

1748

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

1749

1750

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

if(sd < 0){

1752

ret_errno = errno;

1753

perror_plus("socket");

1754

errno = old_errno;

1755

return ret_errno;

1756

}

1757

1758

if(debug){

1759

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

1760

interface);

1761

}

1762

1763

/* Raise priviliges */

1764

raise_privileges();

1765

1766

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

1767

ret_errno = errno;

1768

1769

/* Lower privileges */

1770

lower_privileges();

1771

1772

/* Close the socket */

1773

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

1774

if(ret == -1){

1775

perror_plus("close");

1776

}

1777

1778

if(ret_setflags == -1){

1779

errno = ret_errno;

1780

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1781

errno = old_errno;

1782

return ret_errno;

1783

}

1784

} else if(debug){

1785

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

1786

interface);

1787

}

1788

1789

errno = old_errno;

1790

return 0;

1791

}

1792

1793

1513

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

1794

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

1795

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

1796

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

1797

.interfaces = NULL, .interfaces_size = 0 };

1798

1514

AvahiSServiceBrowser *sb = NULL;

1799

error_t ret_errno;

1515

int error;

1800

1516

int ret;

1801

1517

intmax_t tmpmax;

1802

1518

char *tmp;

1803

1519

int exitcode = EXIT_SUCCESS;

1804

char *interfaces_to_take_down = NULL;

1805

size_t interfaces_to_take_down_size = 0;

1520

const char *interface = "";

1521

struct ifreq network;

1522

int sd = -1;

1523

bool take_down_interface = false;

1524

uid_t uid;

1525

gid_t gid;

1806

1526

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

1807

1527

bool tempdir_created = false;

1808

1528

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1809

1529

const char *seckey = PATHDIR "/" SECKEY;

1810

1530

const char *pubkey = PATHDIR "/" PUBKEY;

1811

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

1813

1531

1814

1532

bool gnutls_initialized = false;

1815

1533

bool gpgme_initialized = false;

1877

1595

.group = 2 },

1878

1596

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

1879

1597

.arg = "SECONDS",

1880

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

1598

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

1881

1599

.group = 2 },

1882

1600

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

1883

1601

.arg = "DIR",

1906

1624

connect_to = arg;

1907

1625

break;

1908

1626

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

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

}

1627

interface = arg;

1914

1628

break;

1915

1629

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

1916

1630

seckey = arg;

1959

1673

argp_state_help(state, state->out_stream,

1960

1674

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1961

1675

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

1676

fprintf_plus(state->out_stream,

1677

"Mandos plugin mandos-client: ");

1962

1678

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

1963

1679

exit(argp_err_exit_status);

1964

1680

break;

1994

1710

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

1995

1711

1996

1712

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

1713

errno = 0;

1714

ret = seteuid(0);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

} else {

1998

1718

struct stat st;

1999

1719

2000

1720

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

2040

1760

}

2041

1761

2042

1762

/* Lower privileges */

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;

1763

errno = 0;

1764

ret = seteuid(uid);

1765

if(ret == -1){

1766

perror_plus("seteuid");

2060

1767

}

2061

1768

}

2062

1769

}

2063

1770

2064

1771

/* Run network hooks */

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

interfaces_hooks_size = mc.interfaces_size;

2074

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2075

(int)',');

2076

}

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

1772

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

1773

goto end;

2081

1774

}

2082

1775

2083

1776

if(not debug){

2084

1777

avahi_set_log_function(empty_log);

2085

1778

}

2086

1779

1780

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

1781

struct dirent **direntries;

1782

/* First look for interfaces that are up */

1783

ret = scandir(sys_class_net, &direntries, up_interface,

1784

alphasort);

1785

if(ret == 0){

1786

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

1787

free(direntries);

1788

ret = scandir(sys_class_net, &direntries, good_interface,

1789

alphasort);

1790

}

1791

if(ret >= 1){

1792

/* Pick the first interface returned */

1793

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

1794

if(debug){

1795

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

1796

}

1797

if(interface == NULL){

1798

perror_plus("malloc");

1799

free(direntries);

1800

exitcode = EXIT_FAILURE;

1801

goto end;

1802

}

1803

free(direntries);

1804

} else {

1805

free(direntries);

1806

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

1807

exitcode = EXIT_FAILURE;

1808

goto end;

1809

}

1810

}

1811

2087

1812

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

2088

1813

from the signal handler */

2089

1814

/* Initialize the pseudo-RNG for Avahi */

2090

1815

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

2091

simple_poll = avahi_simple_poll_new();

2092

if(simple_poll == NULL){

1816

mc.simple_poll = avahi_simple_poll_new();

1817

if(mc.simple_poll == NULL){

2093

1818

fprintf_plus(stderr,

2094

1819

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

2095

1820

exitcode = EX_UNAVAILABLE;

2159

1884

}

2160

1885

}

2161

1886

2162

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

2163

if(mc.interfaces == NULL){

2164

struct dirent **direntries;

2165

/* Look for any good interfaces */

2166

ret = scandir(sys_class_net, &direntries, good_interface,

2167

alphasort);

2168

if(ret >= 1){

2169

/* Add all found interfaces to interfaces list */

2170

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

2171

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

2172

direntries[i]->d_name);

2173

if(ret_errno != 0){

2174

perror_plus("argz_add");

2175

continue;

2176

}

2177

if(debug){

2178

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

2179

direntries[i]->d_name);

2180

}

2181

}

2182

free(direntries);

2183

} else {

2184

free(direntries);

2185

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

2186

exitcode = EXIT_FAILURE;

2187

goto end;

2188

}

2189

}

2190

2191

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

2192

{

2193

char *interface = NULL;

2194

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

2195

interface))){

2196

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

2197

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

2198

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

2199

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

2200

interface);

2201

interface = NULL;

2202

while((interface = argz_next(mc.interfaces,

2203

mc.interfaces_size, interface))){

2204

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

2205

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

2206

interface);

2207

interface = NULL;

1887

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

1888

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

1889

if_index = (AvahiIfIndex) if_nametoindex(interface);

1890

if(if_index == 0){

1891

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

1892

exitcode = EX_UNAVAILABLE;

1893

goto end;

1894

}

1895

1896

if(quit_now){

1897

goto end;

1898

}

1899

1900

/* Re-raise priviliges */

1901

errno = 0;

1902

ret = seteuid(0);

1903

if(ret == -1){

1904

perror_plus("seteuid");

1905

}

1906

1907

#ifdef __linux__

1908

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1909

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

1910

ret = klogctl(8, NULL, 5);

1911

bool restore_loglevel = true;

1912

if(ret == -1){

1913

restore_loglevel = false;

1914

perror_plus("klogctl");

1915

}

1916

#endif /* __linux__ */

1917

1918

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1919

if(sd < 0){

1920

perror_plus("socket");

1921

exitcode = EX_OSERR;

1922

#ifdef __linux__

1923

if(restore_loglevel){

1924

ret = klogctl(7, NULL, 0);

1925

if(ret == -1){

1926

perror_plus("klogctl");

1927

}

1928

}

1929

#endif /* __linux__ */

1930

/* Lower privileges */

1931

errno = 0;

1932

ret = seteuid(uid);

1933

if(ret == -1){

1934

perror_plus("seteuid");

1935

}

1936

goto end;

1937

}

1938

strcpy(network.ifr_name, interface);

1939

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

1940

if(ret == -1){

1941

perror_plus("ioctl SIOCGIFFLAGS");

1942

#ifdef __linux__

1943

if(restore_loglevel){

1944

ret = klogctl(7, NULL, 0);

1945

if(ret == -1){

1946

perror_plus("klogctl");

1947

}

1948

}

1949

#endif /* __linux__ */

1950

exitcode = EX_OSERR;

1951

/* Lower privileges */

1952

errno = 0;

1953

ret = seteuid(uid);

1954

if(ret == -1){

1955

perror_plus("seteuid");

1956

}

1957

goto end;

1958

}

1959

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

1960

network.ifr_flags |= IFF_UP;

1961

take_down_interface = true;

1962

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

1963

if(ret == -1){

1964

take_down_interface = false;

1965

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1966

exitcode = EX_OSERR;

1967

#ifdef __linux__

1968

if(restore_loglevel){

1969

ret = klogctl(7, NULL, 0);

1970

if(ret == -1){

1971

perror_plus("klogctl");

2208

1972

}

2209

1973

}

1974

#endif /* __linux__ */

1975

/* Lower privileges */

1976

errno = 0;

1977

ret = seteuid(uid);

1978

if(ret == -1){

1979

perror_plus("seteuid");

1980

}

1981

goto end;

1982

}

1983

}

1984

/* Sleep checking until interface is running.

1985

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

1986

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

1987

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

1988

if(ret == -1){

1989

perror_plus("ioctl SIOCGIFFLAGS");

1990

} else if(network.ifr_flags & IFF_RUNNING){

2210

1991

break;

2211

1992

}

2212

bool interface_was_up = interface_is_up(interface);

2213

ret = bring_up_interface(interface, delay);

2214

if(not interface_was_up){

2215

if(ret != 0){

2216

errno = ret;

2217

perror_plus("Failed to bring up interface");

2218

} else {

2219

ret_errno = argz_add(&interfaces_to_take_down,

2220

&interfaces_to_take_down_size,

2221

interface);

2222

}

2223

}

2224

}

2225

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

2226

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

2227

}

2228

}

2229

2230

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

2231

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

2232

if(debug){

2233

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

2234

mc.interfaces);

2235

}

2236

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

1993

struct timespec sleeptime = { .tv_nsec = 250000000 };

1994

ret = nanosleep(&sleeptime, NULL);

1995

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

1996

perror_plus("nanosleep");

1997

}

1998

}

1999

if(not take_down_interface){

2000

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

2001

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

2002

if(ret == -1){

2003

perror_plus("close");

2004

}

2005

}

2006

#ifdef __linux__

2007

if(restore_loglevel){

2008

/* Restores kernel loglevel to default */

2009

ret = klogctl(7, NULL, 0);

2010

if(ret == -1){

2011

perror_plus("klogctl");

2012

}

2013

}

2014

#endif /* __linux__ */

2015

/* Lower privileges */

2016

errno = 0;

2017

/* Lower privileges */

2018

ret = seteuid(uid);

2019

if(ret == -1){

2020

perror_plus("seteuid");

2021

}

2237

2022

}

2238

2023

2239

2024

if(quit_now){

2240

2025

goto end;

2241

2026

}

2242

2027

2243

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

2028

ret = init_gnutls_global(pubkey, seckey);

2244

2029

if(ret == -1){

2245

2030

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

2246

2031

exitcode = EX_UNAVAILABLE;

2263

2048

goto end;

2264

2049

}

2265

2050

2266

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

2051

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

2267

2052

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

2268

2053

exitcode = EX_UNAVAILABLE;

2269

2054

goto end;

2279

2064

/* Connect directly, do not use Zeroconf */

2280

2065

/* (Mainly meant for debugging) */

2281

2066

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

2282

2283

2067

if(address == NULL){

2284

2068

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

2285

2069

exitcode = EX_USAGE;

2290

2074

goto end;

2291

2075

}

2292

2076

2293

in_port_t port;

2077

uint16_t port;

2294

2078

errno = 0;

2295

2079

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

2296

2080

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

2297

or tmpmax != (in_port_t)tmpmax){

2081

or tmpmax != (uint16_t)tmpmax){

2298

2082

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

2299

2083

exitcode = EX_USAGE;

2300

2084

goto end;

2301

2085

}

2302

2086

2303

2087

if(quit_now){

2304

2088

goto end;

2305

2089

}

2306

2090

2307

port = (in_port_t)tmpmax;

2091

port = (uint16_t)tmpmax;

2308

2092

*address = '\0';

2309

2093

/* Colon in address indicates IPv6 */

2310

2094

int af;

2326

2110

}

2327

2111

2328

2112

while(not quit_now){

2329

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

2330

&mc);

2113

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

2331

2114

if(quit_now or ret == 0){

2332

2115

break;

2333

2116

}

2335

2118

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

2336

2119

(int)retry_interval);

2337

2120

}

2338

sleep((unsigned int)retry_interval);

2121

sleep((int)retry_interval);

2339

2122

}

2340

2123

2341

2124

if (not quit_now){

2359

2142

config.publish_domain = 0;

2360

2143

2361

2144

/* Allocate a new server */

2362

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2363

&config, NULL, NULL, &ret_errno);

2145

mc.server = avahi_server_new(avahi_simple_poll_get

2146

(mc.simple_poll), &config, NULL,

2147

NULL, &error);

2364

2148

2365

2149

/* Free the Avahi configuration data */

2366

2150

avahi_server_config_free(&config);

2369

2153

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

2370

2154

if(mc.server == NULL){

2371

2155

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

2372

avahi_strerror(ret_errno));

2156

avahi_strerror(error));

2373

2157

exitcode = EX_UNAVAILABLE;

2374

2158

goto end;

2375

2159

}

2381

2165

/* Create the Avahi service browser */

2382

2166

sb = avahi_s_service_browser_new(mc.server, if_index,

2383

2167

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2384

NULL, 0, browse_callback,

2385

(void *)&mc);

2168

NULL, 0, browse_callback, NULL);

2386

2169

if(sb == NULL){

2387

2170

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

2388

2171

avahi_strerror(avahi_server_errno(mc.server)));

2400

2183

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

2401

2184

}

2402

2185

2403

ret = avahi_loop_with_timeout(simple_poll,

2404

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

2186

ret = avahi_loop_with_timeout(mc.simple_poll,

2187

(int)(retry_interval * 1000));

2405

2188

if(debug){

2406

2189

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

2407

2190

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

2414

2197

}

2415

2198

2416

2199

/* Cleanup things */

2417

free(mc.interfaces);

2418

2419

2200

if(sb != NULL)

2420

2201

avahi_s_service_browser_free(sb);

2421

2202

2422

2203

if(mc.server != NULL)

2423

2204

avahi_server_free(mc.server);

2424

2205

2425

if(simple_poll != NULL)

2426

avahi_simple_poll_free(simple_poll);

2206

if(mc.simple_poll != NULL)

2207

avahi_simple_poll_free(mc.simple_poll);

2427

2208

2428

2209

if(gnutls_initialized){

2429

2210

gnutls_certificate_free_credentials(mc.cred);

2446

2227

}

2447

2228

}

2448

2229

2230

/* Run network hooks */

2231

run_network_hooks("stop", interface, delay);

2232

2449

2233

/* Re-raise priviliges */

2450

2234

{

2451

raise_privileges();

2452

2453

/* Run network hooks */

2454

run_network_hooks("stop", interfaces_hooks != NULL ?

2455

interfaces_hooks : "", delay);

2456

2457

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

2458

{

2459

char *interface = NULL;

2460

while((interface=argz_next(interfaces_to_take_down,

2461

interfaces_to_take_down_size,

2462

interface))){

2463

ret_errno = take_down_interface(interface);

2464

if(ret_errno != 0){

2465

errno = ret_errno;

2466

perror_plus("Failed to take down interface");

2235

errno = 0;

2236

ret = seteuid(0);

2237

if(ret == -1){

2238

perror_plus("seteuid");

2239

}

2240

2241

/* Take down the network interface */

2242

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

2243

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

2244

if(ret == -1){

2245

perror_plus("ioctl SIOCGIFFLAGS");

2246

} else if(network.ifr_flags & IFF_UP){

2247

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

2248

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

2249

if(ret == -1){

2250

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2467

2251

}

2468

2252

}

2469

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

2470

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

2471

" down\n");

2253

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

2254

if(ret == -1){

2255

perror_plus("close");

2472

2256

}

2473

2257

}

2474

2475

lower_privileges_permanently();

2476

}

2477

2478

free(interfaces_to_take_down);

2479

free(interfaces_hooks);

2258

}

2259

/* Lower privileges permanently */

2260

errno = 0;

2261

ret = setuid(uid);

2262

if(ret == -1){

2263

perror_plus("setuid");

2264

}

2480

2265

2481

2266

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

2482

2267

if(tempdir_created){