/mandos/trunk : revision 546

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

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*

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* Everything else is

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*

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

16

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

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

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stdout, ferror(), remove() */

44

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

62

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

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strtoimax() */

64

#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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67

#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";

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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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139

/* 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

155

unsigned int dh_bits;

161

157

const char *priority;

162

158

gpgme_ctx_t ctx;

163

159

server *current_server;

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char *interfaces;

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size_t interfaces_size;

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160

} mandos_context;

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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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sig_atomic_t quit_now = 0;

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169

int signal_received = 0;

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188

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

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186

program_invocation_short_name));

190

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

187

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

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188

}

192

189

193

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/*

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}

209

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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){

208

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

209

int af){

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int ret;

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211

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

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if(new_server == NULL){

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return false;

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}

227

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/* Special case of first server */

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if(*current_server == NULL){

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if (mc.current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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*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 */

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} 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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new_server->prev->next = new_server;

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(*current_server)->prev = new_server;

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mc.current_server->prev = new_server;

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}

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

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

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if(ret == -1){

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perror_plus("clock_gettime");

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return false;

248

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* Initialize GPGME.

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*/

250

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

251

const char *tempdir, mandos_context *mc){

248

const char *tempdir){

252

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gpgme_error_t rc;

253

250

gpgme_engine_info_t engine_info;

254

251

252

255

253

/*

256

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

257

255

*/

273

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return false;

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272

}

275

273

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

274

rc = gpgme_op_import(mc.ctx, pgp_data);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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321

}

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/* Create new GPGME "context" */

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

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

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if(rc != GPG_ERR_NO_ERROR){

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

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

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342

*/

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static ssize_t pgp_packet_decrypt(const char *cryptotext,

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size_t crypto_size,

347

char **plaintext,

348

mandos_context *mc){

345

char **plaintext){

349

346

gpgme_data_t dh_crypto, dh_plain;

350

347

gpgme_error_t rc;

351

348

ssize_t ret;

377

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378

375

/* 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);

377

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

381

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if(rc != GPG_ERR_NO_ERROR){

382

379

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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plaintext_length = -1;

385

382

if(debug){

386

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gpgme_decrypt_result_t result;

387

result = gpgme_op_decrypt_result(mc->ctx);

384

result = gpgme_op_decrypt_result(mc.ctx);

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385

if(result == NULL){

389

386

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

390

387

} else {

468

465

}

469

466

470

467

static const char * safer_gnutls_strerror(int value){

471

const char *ret = gnutls_strerror(value);

468

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

469

-Wunreachable-code */

472

470

if(ret == NULL)

473

471

ret = "(unknown)";

474

472

return ret;

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}

482

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483

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static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename,

485

mandos_context *mc){

482

const char *seckeyfilename){

486

483

int ret;

487

484

488

485

if(debug){

505

502

}

506

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/* OpenPGP credentials */

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

509

506

if(ret != GNUTLS_E_SUCCESS){

510

507

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

511

508

safer_gnutls_strerror(ret));

521

518

}

522

519

523

520

ret = gnutls_certificate_set_openpgp_key_file

524

(mc->cred, pubkeyfilename, seckeyfilename,

521

(mc.cred, pubkeyfilename, seckeyfilename,

525

522

GNUTLS_OPENPGP_FMT_BASE64);

526

523

if(ret != GNUTLS_E_SUCCESS){

527

524

fprintf_plus(stderr,

533

530

}

534

531

535

532

/* GnuTLS server initialization */

536

ret = gnutls_dh_params_init(&mc->dh_params);

533

ret = gnutls_dh_params_init(&mc.dh_params);

537

534

if(ret != GNUTLS_E_SUCCESS){

538

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

536

" initialization: %s\n",

540

537

safer_gnutls_strerror(ret));

541

538

goto globalfail;

542

539

}

543

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

540

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

544

541

if(ret != GNUTLS_E_SUCCESS){

545

542

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

546

543

safer_gnutls_strerror(ret));

547

544

goto globalfail;

548

545

}

549

546

550

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

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

551

548

552

549

return 0;

553

550

554

551

globalfail:

555

552

556

gnutls_certificate_free_credentials(mc->cred);

553

gnutls_certificate_free_credentials(mc.cred);

557

554

gnutls_global_deinit();

558

gnutls_dh_params_deinit(mc->dh_params);

555

gnutls_dh_params_deinit(mc.dh_params);

559

556

return -1;

560

557

}

561

558

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

559

static int init_gnutls_session(gnutls_session_t *session){

564

560

int ret;

565

561

/* GnuTLS session creation */

566

562

do {

578

574

{

579

575

const char *err;

580

576

do {

581

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

577

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

582

578

if(quit_now){

583

579

gnutls_deinit(*session);

584

580

return -1;

595

591

596

592

do {

597

593

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc->cred);

594

mc.cred);

599

595

if(quit_now){

600

596

gnutls_deinit(*session);

601

597

return -1;

611

607

/* ignore client certificate if any. */

612

608

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

609

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

615

611

616

612

return 0;

617

613

}

621

617

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

622

618

623

619

/* Called when a Mandos server is found */

624

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

620

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

625

621

AvahiIfIndex if_index,

626

int af, mandos_context *mc){

622

int af){

627

623

int ret, tcp_sd = -1;

628

624

ssize_t sret;

629

625

union {

659

655

return -1;

660

656

}

661

657

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);

658

ret = init_gnutls_session(&session);

695

659

if(ret != 0){

696

660

return -1;

697

661

}

698

662

699

663

if(debug){

700

664

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

701

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

665

PRIu16 "\n", ip, port);

702

666

}

703

667

704

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

735

699

goto mandos_end;

736

700

}

737

701

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

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

743

706

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

707

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

708

-Wunreachable-code*/

748

709

if(if_index == AVAHI_IF_UNSPEC){

749

710

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

750

711

" incomplete without a network interface\n");

755

716

to.in6.sin6_scope_id = (uint32_t)if_index;

756

717

}

757

718

} else {

758

to.in.sin_port = htons(port);

719

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

720

-Wconversion and

721

-Wunreachable-code */

759

722

}

760

723

761

724

if(quit_now){

769

732

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

770

733

perror_plus("if_indextoname");

771

734

} else {

772

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

773

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

735

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

736

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

774

737

}

775

738

} else {

776

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

777

ip, (uintmax_t)port);

739

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

740

ip, port);

778

741

}

779

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

780

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

858

821

goto mandos_end;

859

822

}

860

823

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);

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

866

826

867

827

if(quit_now){

868

828

errno = EINTR;

973

933

if(buffer_length > 0){

974

934

ssize_t decrypted_buffer_size;

975

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

976

&decrypted_buffer, mc);

936

&decrypted_buffer);

977

937

if(decrypted_buffer_size >= 0){

978

938

979

939

written = 0;

1040

1000

AVAHI_GCC_UNUSED AvahiStringList *txt,

1041

1001

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1042

1002

flags,

1043

void* mc){

1044

if(r == NULL){

1045

return;

1046

}

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1047

1005

1048

1006

/* Called whenever a service has been resolved successfully or

1049

1007

timed out */

1058

1016

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

1059

1017

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

1060

1018

domain,

1061

avahi_strerror(avahi_server_errno

1062

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

1019

avahi_strerror(avahi_server_errno(mc.server)));

1063

1020

break;

1064

1021

1065

1022

case AVAHI_RESOLVER_FOUND:

1071

1028

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

1072

1029

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

1073

1030

}

1074

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

1075

interface,

1076

avahi_proto_to_af(proto),

1077

mc);

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1078

1033

if(ret == 0){

1079

avahi_simple_poll_quit(simple_poll);

1034

avahi_simple_poll_quit(mc.simple_poll);

1080

1035

} else {

1081

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

1082

avahi_proto_to_af(proto),

1083

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

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1084

1038

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

1085

1039

" list\n", name);

1086

1040

}

1099

1053

const char *domain,

1100

1054

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1101

1055

flags,

1102

void* mc){

1103

if(b == NULL){

1104

return;

1105

}

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1106

1058

1107

1059

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

1108

1060

is removed from the LAN */

1116

1068

case AVAHI_BROWSER_FAILURE:

1117

1069

1118

1070

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);

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1122

1073

return;

1123

1074

1124

1075

case AVAHI_BROWSER_NEW:

1127

1078

the callback function is called the Avahi server will free the

1128

1079

resolver for us. */

1129

1080

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)

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1134

1084

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

1135

1085

" %s\n", name,

1136

avahi_strerror(avahi_server_errno

1137

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

1086

avahi_strerror(avahi_server_errno(mc.server)));

1138

1087

break;

1139

1088

1140

1089

case AVAHI_BROWSER_REMOVE:

1159

1108

signal_received = sig;

1160

1109

int old_errno = errno;

1161

1110

/* set main loop to exit */

1162

if(simple_poll != NULL){

1163

avahi_simple_poll_quit(simple_poll);

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1164

1113

}

1165

1114

errno = old_errno;

1166

1115

}

1167

1116

1168

1117

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

1169

1118

int ret;

1170

error_t ret_errno;

1171

1119

1172

1120

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

1173

1121

if(s < 0){

1174

ret_errno = errno;

1175

1122

perror_plus("socket");

1176

errno = ret_errno;

1177

1123

return false;

1178

1124

}

1179

1125

strcpy(ifr->ifr_name, ifname);

1180

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1181

1127

if(ret == -1){

1182

1128

if(debug){

1183

ret_errno = errno;

1184

1129

perror_plus("ioctl SIOCGIFFLAGS");

1185

errno = ret_errno;

1186

1130

}

1187

1131

return false;

1188

1132

}

1257

1201

}

1258

1202

1259

1203

/*

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);

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1289

1244

}

1290

1245

1291

1246

int notdotentries(const struct dirent *direntry){

1360

1315

return 1;

1361

1316

}

1362

1317

1363

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1364

mandos_context *mc){

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1365

1319

int ret;

1366

1320

struct timespec now;

1367

1321

struct timespec waited_time;

1368

1322

intmax_t block_time;

1369

1323

1370

1324

while(true){

1371

if(mc->current_server == NULL){

1325

if(mc.current_server == NULL){

1372

1326

if (debug){

1373

1327

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

1374

1328

" No timeout!\n");

1388

1342

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

1389

1343

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

1390

1344

waited_time.tv_sec = (now.tv_sec

1391

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

1345

- mc.current_server->last_seen.tv_sec);

1392

1346

waited_time.tv_nsec = (now.tv_nsec

1393

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

1347

- mc.current_server->last_seen.tv_nsec);

1394

1348

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

1395

1349

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

1396

1350

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

1404

1358

}

1405

1359

1406

1360

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);

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

1411

1365

if(ret == 0){

1412

avahi_simple_poll_quit(s);

1366

avahi_simple_poll_quit(mc.simple_poll);

1413

1367

return 0;

1414

1368

}

1415

1369

ret = clock_gettime(CLOCK_MONOTONIC,

1416

&mc->current_server->last_seen);

1370

&mc.current_server->last_seen);

1417

1371

if(ret == -1){

1418

1372

perror_plus("clock_gettime");

1419

1373

return -1;

1420

1374

}

1421

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

1375

mc.current_server = mc.current_server->next;

1422

1376

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

1423

1377

servers, but don't block */

1424

1378

}

1433

1387

}

1434

1388

}

1435

1389

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

1390

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

1489

1391

const float delay){

1490

1392

struct dirent **direntries;

1493

1395

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

1494

1396

alphasort);

1495

1397

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

}

1398

perror_plus("scandir");

1504

1399

} else {

1505

1400

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

1506

1401

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

1519

1414

if(hook_pid == 0){

1520

1415

/* Child */

1521

1416

/* Raise privileges */

1522

raise_privileges_permanently();

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1523

1428

/* Set group */

1524

1429

errno = 0;

1525

1430

ret = setgid(0);

1618

1523

return true;

1619

1524

}

1620

1525

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

1526

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

1527

AvahiSServiceBrowser *sb = NULL;

1799

error_t ret_errno;

1528

int error;

1800

1529

int ret;

1801

1530

intmax_t tmpmax;

1802

1531

char *tmp;

1803

1532

int exitcode = EXIT_SUCCESS;

1804

char *interfaces_to_take_down = NULL;

1805

size_t interfaces_to_take_down_size = 0;

1533

const char *interface = "";

1534

struct ifreq network;

1535

int sd = -1;

1536

bool take_down_interface = false;

1537

uid_t uid;

1538

gid_t gid;

1806

1539

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

1807

1540

bool tempdir_created = false;

1808

1541

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1809

1542

const char *seckey = PATHDIR "/" SECKEY;

1810

1543

const char *pubkey = PATHDIR "/" PUBKEY;

1811

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

1813

1544

1814

1545

bool gnutls_initialized = false;

1815

1546

bool gpgme_initialized = false;

1906

1637

connect_to = arg;

1907

1638

break;

1908

1639

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

}

1640

interface = arg;

1914

1641

break;

1915

1642

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

1916

1643

seckey = arg;

1994

1721

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

1995

1722

1996

1723

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

1728

} else {

1998

1729

struct stat st;

1999

1730

2000

1731

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

2040

1771

}

2041

1772

2042

1773

/* 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;

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

2060

1778

}

2061

1779

}

2062

1780

}

2063

1781

2064

1782

/* 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

}

1783

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

1784

goto end;

2081

1785

}

2082

1786

2083

1787

if(not debug){

2084

1788

avahi_set_log_function(empty_log);

2085

1789

}

2086

1790

1791

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

1792

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1795

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

if(ret >= 1){

1803

/* Pick the first interface returned */

1804

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

1805

if(debug){

1806

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

1807

}

1808

if(interface == NULL){

1809

perror_plus("malloc");

1810

free(direntries);

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

free(direntries);

1815

} else {

1816

free(direntries);

1817

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

1818

exitcode = EXIT_FAILURE;

1819

goto end;

1820

}

1821

}

1822

2087

1823

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

2088

1824

from the signal handler */

2089

1825

/* Initialize the pseudo-RNG for Avahi */

2090

1826

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

2091

simple_poll = avahi_simple_poll_new();

2092

if(simple_poll == NULL){

1827

mc.simple_poll = avahi_simple_poll_new();

1828

if(mc.simple_poll == NULL){

2093

1829

fprintf_plus(stderr,

2094

1830

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

2095

1831

exitcode = EX_UNAVAILABLE;

2159

1895

}

2160

1896

}

2161

1897

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;

1898

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

1899

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

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

if(if_index == 0){

1902

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

1903

exitcode = EX_UNAVAILABLE;

1904

goto end;

1905

}

1906

1907

if(quit_now){

1908

goto end;

1909

}

1910

1911

/* Re-raise priviliges */

1912

errno = 0;

1913

ret = seteuid(0);

1914

if(ret == -1){

1915

perror_plus("seteuid");

1916

}

1917

1918

#ifdef __linux__

1919

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1920

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

1921

ret = klogctl(8, NULL, 5);

1922

bool restore_loglevel = true;

1923

if(ret == -1){

1924

restore_loglevel = false;

1925

perror_plus("klogctl");

1926

}

1927

#endif /* __linux__ */

1928

1929

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1930

if(sd < 0){

1931

perror_plus("socket");

1932

exitcode = EX_OSERR;

1933

#ifdef __linux__

1934

if(restore_loglevel){

1935

ret = klogctl(7, NULL, 0);

1936

if(ret == -1){

1937

perror_plus("klogctl");

1938

}

1939

}

1940

#endif /* __linux__ */

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

strcpy(network.ifr_name, interface);

1950

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

1951

if(ret == -1){

1952

perror_plus("ioctl SIOCGIFFLAGS");

1953

#ifdef __linux__

1954

if(restore_loglevel){

1955

ret = klogctl(7, NULL, 0);

1956

if(ret == -1){

1957

perror_plus("klogctl");

1958

}

1959

}

1960

#endif /* __linux__ */

1961

exitcode = EX_OSERR;

1962

/* Lower privileges */

1963

errno = 0;

1964

ret = seteuid(uid);

1965

if(ret == -1){

1966

perror_plus("seteuid");

1967

}

1968

goto end;

1969

}

1970

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

1971

network.ifr_flags |= IFF_UP;

1972

take_down_interface = true;

1973

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

1974

if(ret == -1){

1975

take_down_interface = false;

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1977

exitcode = EX_OSERR;

1978

#ifdef __linux__

1979

if(restore_loglevel){

1980

ret = klogctl(7, NULL, 0);

1981

if(ret == -1){

1982

perror_plus("klogctl");

2208

1983

}

2209

1984

}

1985

#endif /* __linux__ */

1986

/* Lower privileges */

1987

errno = 0;

1988

ret = seteuid(uid);

1989

if(ret == -1){

1990

perror_plus("seteuid");

1991

}

1992

goto end;

1993

}

1994

}

1995

/* Sleep checking until interface is running.

1996

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

1997

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

1998

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

1999

if(ret == -1){

2000

perror_plus("ioctl SIOCGIFFLAGS");

2001

} else if(network.ifr_flags & IFF_RUNNING){

2210

2002

break;

2211

2003

}

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);

2004

struct timespec sleeptime = { .tv_nsec = 250000000 };

2005

ret = nanosleep(&sleeptime, NULL);

2006

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

2007

perror_plus("nanosleep");

2008

}

2009

}

2010

if(not take_down_interface){

2011

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

2012

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

2013

if(ret == -1){

2014

perror_plus("close");

2015

}

2016

}

2017

#ifdef __linux__

2018

if(restore_loglevel){

2019

/* Restores kernel loglevel to default */

2020

ret = klogctl(7, NULL, 0);

2021

if(ret == -1){

2022

perror_plus("klogctl");

2023

}

2024

}

2025

#endif /* __linux__ */

2026

/* Lower privileges */

2027

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

2032

}

2237

2033

}

2238

2034

2239

2035

if(quit_now){

2240

2036

goto end;

2241

2037

}

2242

2038

2243

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

2039

ret = init_gnutls_global(pubkey, seckey);

2244

2040

if(ret == -1){

2245

2041

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

2246

2042

exitcode = EX_UNAVAILABLE;

2263

2059

goto end;

2264

2060

}

2265

2061

2266

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

2062

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

2267

2063

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

2268

2064

exitcode = EX_UNAVAILABLE;

2269

2065

goto end;

2279

2075

/* Connect directly, do not use Zeroconf */

2280

2076

/* (Mainly meant for debugging) */

2281

2077

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

2282

2283

2078

if(address == NULL){

2284

2079

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

2285

2080

exitcode = EX_USAGE;

2290

2085

goto end;

2291

2086

}

2292

2087

2293

in_port_t port;

2088

uint16_t port;

2294

2089

errno = 0;

2295

2090

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

2296

2091

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

2297

or tmpmax != (in_port_t)tmpmax){

2092

or tmpmax != (uint16_t)tmpmax){

2298

2093

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

2299

2094

exitcode = EX_USAGE;

2300

2095

goto end;

2301

2096

}

2302

2097

2303

2098

if(quit_now){

2304

2099

goto end;

2305

2100

}

2306

2101

2307

port = (in_port_t)tmpmax;

2102

port = (uint16_t)tmpmax;

2308

2103

*address = '\0';

2309

2104

/* Colon in address indicates IPv6 */

2310

2105

int af;

2326

2121

}

2327

2122

2328

2123

while(not quit_now){

2329

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

2330

&mc);

2124

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

2331

2125

if(quit_now or ret == 0){

2332

2126

break;

2333

2127

}

2335

2129

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

2336

2130

(int)retry_interval);

2337

2131

}

2338

sleep((unsigned int)retry_interval);

2132

sleep((int)retry_interval);

2339

2133

}

2340

2134

2341

2135

if (not quit_now){

2359

2153

config.publish_domain = 0;

2360

2154

2361

2155

/* Allocate a new server */

2362

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2363

&config, NULL, NULL, &ret_errno);

2156

mc.server = avahi_server_new(avahi_simple_poll_get

2157

(mc.simple_poll), &config, NULL,

2158

NULL, &error);

2364

2159

2365

2160

/* Free the Avahi configuration data */

2366

2161

avahi_server_config_free(&config);

2369

2164

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

2370

2165

if(mc.server == NULL){

2371

2166

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

2372

avahi_strerror(ret_errno));

2167

avahi_strerror(error));

2373

2168

exitcode = EX_UNAVAILABLE;

2374

2169

goto end;

2375

2170

}

2381

2176

/* Create the Avahi service browser */

2382

2177

sb = avahi_s_service_browser_new(mc.server, if_index,

2383

2178

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2384

NULL, 0, browse_callback,

2385

(void *)&mc);

2179

NULL, 0, browse_callback, NULL);

2386

2180

if(sb == NULL){

2387

2181

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

2388

2182

avahi_strerror(avahi_server_errno(mc.server)));

2400

2194

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

2401

2195

}

2402

2196

2403

ret = avahi_loop_with_timeout(simple_poll,

2404

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

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

2405

2199

if(debug){

2406

2200

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

2407

2201

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

2414

2208

}

2415

2209

2416

2210

/* Cleanup things */

2417

free(mc.interfaces);

2418

2419

2211

if(sb != NULL)

2420

2212

avahi_s_service_browser_free(sb);

2421

2213

2422

2214

if(mc.server != NULL)

2423

2215

avahi_server_free(mc.server);

2424

2216

2425

if(simple_poll != NULL)

2426

avahi_simple_poll_free(simple_poll);

2217

if(mc.simple_poll != NULL)

2218

avahi_simple_poll_free(mc.simple_poll);

2427

2219

2428

2220

if(gnutls_initialized){

2429

2221

gnutls_certificate_free_credentials(mc.cred);

2446

2238

}

2447

2239

}

2448

2240

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2449

2244

/* Re-raise priviliges */

2450

2245

{

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");

2246

errno = 0;

2247

ret = seteuid(0);

2248

if(ret == -1){

2249

perror_plus("seteuid");

2250

}

2251

2252

/* Take down the network interface */

2253

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

2254

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

2255

if(ret == -1){

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

2258

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

2259

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

2260

if(ret == -1){

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2467

2262

}

2468

2263

}

2469

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

2470

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

2471

" down\n");

2264

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

2265

if(ret == -1){

2266

perror_plus("close");

2472

2267

}

2473

2268

}

2474

2475

lower_privileges_permanently();

2476

}

2477

2478

free(interfaces_to_take_down);

2479

free(interfaces_hooks);

2269

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2480

2276

2481

2277

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

2482

2278

if(tempdir_created){