/mandos/trunk : revision 670

9

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

10

*

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* Everything else is

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13

12

13

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*

15

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

16

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

55

opendir(), DIR */

56

#include <sys/stat.h> /* open(), S_ISREG */

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

58

inet_pton(), connect() */

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inet_pton(), connect(),

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getnameinfo() */

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60

#include <fcntl.h> /* open() */

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61

#include <dirent.h> /* opendir(), struct dirent, readdir()

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*/

73

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

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

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

76

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

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

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

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

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argp_state, struct argp,

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argz_delete(), argz_append(),

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93

argz_stringify(), argz_add(),

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argz_count() */

95

#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

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EAI_SYSTEM, gai_strerror() */

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97

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98

#ifdef __linux__

96

99

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

154

157

155

158

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

156

159

typedef struct {

157

AvahiSimplePoll *simple_poll;

158

160

AvahiServer *server;

159

161

gnutls_certificate_credentials_t cred;

160

162

unsigned int dh_bits;

162

164

const char *priority;

163

165

gpgme_ctx_t ctx;

164

166

server *current_server;

167

char *interfaces;

168

size_t interfaces_size;

165

169

} mandos_context;

166

170

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/* global context so signal handler can reach it*/

168

mandos_context mc = { .simple_poll = NULL, .server = NULL,

169

.dh_bits = 1024, .priority = "SECURE256"

170

":!CTYPE-X.509:+CTYPE-OPENPGP",

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.current_server = NULL };

171

/* global so signal handler can reach it*/

172

AvahiSimplePoll *simple_poll;

172

173

174

sig_atomic_t quit_now = 0;

174

175

int signal_received = 0;

189

190

191

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

191

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program_invocation_short_name));

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

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

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194

}

194

195

196

/*

200

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

202

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

203

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

204

if(buffer == NULL){

204

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

205

if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

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errno = old_errno;

209

*buffer = NULL;

205

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return 0;

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211

}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

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214

}

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return buffer_capacity;

211

217

212

218

/* 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,

214

int af){

220

int af, server **current_server){

215

221

int ret;

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

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if(new_server == NULL){

226

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perror_plus("strdup");

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return false;

228

234

}

235

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

236

if(ret == -1){

237

perror_plus("clock_gettime");

238

return false;

239

}

229

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/* Special case of first server */

230

if (mc.current_server == NULL){

241

if(*current_server == NULL){

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new_server->next = new_server;

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new_server->prev = new_server;

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mc.current_server = new_server;

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*current_server = new_server;

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

235

246

} else {

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new_server->next = mc.current_server;

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

247

new_server->next = *current_server;

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

238

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new_server->prev->next = new_server;

239

mc.current_server->prev = new_server;

240

}

241

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

242

if(ret == -1){

243

perror_plus("clock_gettime");

244

return false;

250

(*current_server)->prev = new_server;

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251

}

246

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return true;

247

253

}

250

256

* Initialize GPGME.

251

257

*/

252

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

253

const char *tempdir){

259

const char *tempdir, mandos_context *mc){

254

260

gpgme_error_t rc;

255

261

gpgme_engine_info_t engine_info;

256

262

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258

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/*

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

260

265

*/

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return false;

277

282

}

278

283

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rc = gpgme_op_import(mc.ctx, pgp_data);

284

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

280

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if(rc != GPG_ERR_NO_ERROR){

281

286

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

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287

gpgme_strsource(rc), gpgme_strerror(rc));

326

331

}

327

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328

333

/* Create new GPGME "context" */

329

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

334

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

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if(rc != GPG_ERR_NO_ERROR){

331

336

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

332

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

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352

*/

348

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

349

354

size_t crypto_size,

350

char **plaintext){

355

char **plaintext,

356

mandos_context *mc){

351

357

gpgme_data_t dh_crypto, dh_plain;

352

358

gpgme_error_t rc;

353

359

ssize_t ret;

379

385

380

386

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

381

387

data buffer */

382

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

388

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

383

389

if(rc != GPG_ERR_NO_ERROR){

384

390

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

385

391

gpgme_strsource(rc), gpgme_strerror(rc));

386

392

plaintext_length = -1;

387

393

if(debug){

388

394

gpgme_decrypt_result_t result;

389

result = gpgme_op_decrypt_result(mc.ctx);

395

result = gpgme_op_decrypt_result(mc->ctx);

390

396

if(result == NULL){

391

397

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

392

398

} else {

483

489

}

484

490

485

491

static int init_gnutls_global(const char *pubkeyfilename,

486

const char *seckeyfilename){

492

const char *seckeyfilename,

493

mandos_context *mc){

487

494

int ret;

488

495

489

496

if(debug){

506

513

}

507

514

508

515

/* OpenPGP credentials */

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

516

ret = gnutls_certificate_allocate_credentials(&mc->cred);

510

517

if(ret != GNUTLS_E_SUCCESS){

511

518

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

512

519

safer_gnutls_strerror(ret));

522

529

}

523

530

524

531

ret = gnutls_certificate_set_openpgp_key_file

525

(mc.cred, pubkeyfilename, seckeyfilename,

532

(mc->cred, pubkeyfilename, seckeyfilename,

526

533

GNUTLS_OPENPGP_FMT_BASE64);

527

534

if(ret != GNUTLS_E_SUCCESS){

528

535

fprintf_plus(stderr,

534

541

}

535

542

536

543

/* GnuTLS server initialization */

537

ret = gnutls_dh_params_init(&mc.dh_params);

544

ret = gnutls_dh_params_init(&mc->dh_params);

538

545

if(ret != GNUTLS_E_SUCCESS){

539

546

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

540

547

" initialization: %s\n",

541

548

safer_gnutls_strerror(ret));

542

549

goto globalfail;

543

550

}

544

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

551

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

545

552

if(ret != GNUTLS_E_SUCCESS){

546

553

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

547

554

safer_gnutls_strerror(ret));

548

555

goto globalfail;

549

556

}

550

557

551

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

558

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

552

559

553

560

return 0;

554

561

555

562

globalfail:

556

563

557

gnutls_certificate_free_credentials(mc.cred);

564

gnutls_certificate_free_credentials(mc->cred);

558

565

gnutls_global_deinit();

559

gnutls_dh_params_deinit(mc.dh_params);

566

gnutls_dh_params_deinit(mc->dh_params);

560

567

return -1;

561

568

}

562

569

563

static int init_gnutls_session(gnutls_session_t *session){

570

static int init_gnutls_session(gnutls_session_t *session,

571

mandos_context *mc){

564

572

int ret;

565

573

/* GnuTLS session creation */

566

574

do {

578

586

{

579

587

const char *err;

580

588

do {

581

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

589

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

582

590

if(quit_now){

583

591

gnutls_deinit(*session);

584

592

return -1;

595

603

596

604

do {

597

605

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc.cred);

606

mc->cred);

599

607

if(quit_now){

600

608

gnutls_deinit(*session);

601

609

return -1;

611

619

/* ignore client certificate if any. */

612

620

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

621

614

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

623

616

624

return 0;

617

625

}

623

631

/* Called when a Mandos server is found */

624

632

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

625

633

AvahiIfIndex if_index,

626

int af){

634

int af, mandos_context *mc){

627

635

int ret, tcp_sd = -1;

628

636

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

637

struct sockaddr_storage to;

633

638

char *buffer = NULL;

634

639

char *decrypted_buffer = NULL;

635

640

size_t buffer_length = 0;

659

664

return -1;

660

665

}

661

666

662

ret = init_gnutls_session(&session);

667

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

668

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

669

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

670

bool match = false;

671

{

672

char *interface = NULL;

673

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

674

interface))){

675

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

676

match = true;

677

break;

678

}

679

}

680

}

681

if(not match){

682

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

683

connect to the server */

684

if(debug){

685

char interface[IF_NAMESIZE];

686

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

687

perror_plus("if_indextoname");

688

} else {

689

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

690

" \"%s\"\n",

691

if_indextoname((unsigned int)if_index,

692

interface));

693

}

694

}

695

return -1;

696

}

697

}

698

699

ret = init_gnutls_session(&session, mc);

663

700

if(ret != 0){

664

701

return -1;

665

702

}

684

721

685

722

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

686

723

if(af == AF_INET6){

687

to.in6.sin6_family = (sa_family_t)af;

688

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

724

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

725

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

689

726

} else { /* IPv4 */

690

to.in.sin_family = (sa_family_t)af;

691

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

727

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

728

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

692

729

}

693

730

if(ret < 0 ){

694

731

int e = errno;

703

740

goto mandos_end;

704

741

}

705

742

if(af == AF_INET6){

706

to.in6.sin6_port = htons(port);

707

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

708

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

709

-Wunreachable-code*/

743

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

744

if(IN6_IS_ADDR_LINKLOCAL

745

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

710

746

if(if_index == AVAHI_IF_UNSPEC){

711

747

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

712

748

" incomplete without a network interface\n");

714

750

goto mandos_end;

715

751

}

716

752

/* Set the network interface number as scope */

717

to.in6.sin6_scope_id = (uint32_t)if_index;

753

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

718

754

}

719

755

} else {

720

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

721

-Wconversion and

722

-Wunreachable-code */

756

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

723

757

}

724

758

725

759

if(quit_now){

742

776

}

743

777

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

744

778

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

745

const char *pcret;

746

779

if(af == AF_INET6){

747

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

748

sizeof(addrstr));

780

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

781

sizeof(struct sockaddr_in6),

782

addrstr, sizeof(addrstr), NULL, 0,

783

NI_NUMERICHOST);

749

784

} else {

750

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

751

sizeof(addrstr));

785

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

786

sizeof(struct sockaddr_in),

787

addrstr, sizeof(addrstr), NULL, 0,

788

NI_NUMERICHOST);

752

789

}

753

if(pcret == NULL){

754

perror_plus("inet_ntop");

755

} else {

756

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

757

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

758

}

790

if(ret == EAI_SYSTEM){

791

perror_plus("getnameinfo");

792

} else if(ret != 0) {

793

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

794

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

795

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

759

796

}

760

797

}

761

798

765

802

}

766

803

767

804

if(af == AF_INET6){

768

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

805

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

806

sizeof(struct sockaddr_in6));

769

807

} else {

770

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

808

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

809

sizeof(struct sockaddr_in));

771

810

}

772

811

if(ret < 0){

773

812

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

937

976

if(buffer_length > 0){

938

977

ssize_t decrypted_buffer_size;

939

978

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

940

&decrypted_buffer);

979

&decrypted_buffer, mc);

941

980

if(decrypted_buffer_size >= 0){

942

981

943

982

written = 0;

1004

1043

AVAHI_GCC_UNUSED AvahiStringList *txt,

1005

1044

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

1045

flags,

1007

AVAHI_GCC_UNUSED void* userdata){

1046

void* mc){

1008

1047

if(r == NULL){

1009

1048

return;

1010

1049

}

1022

1061

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

1023

1062

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

1024

1063

domain,

1025

avahi_strerror(avahi_server_errno(mc.server)));

1064

avahi_strerror(avahi_server_errno

1065

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

1026

1066

break;

1027

1067

1028

1068

case AVAHI_RESOLVER_FOUND:

1036

1076

}

1037

1077

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

1038

1078

interface,

1039

avahi_proto_to_af(proto));

1079

avahi_proto_to_af(proto),

1080

mc);

1040

1081

if(ret == 0){

1041

avahi_simple_poll_quit(mc.simple_poll);

1082

avahi_simple_poll_quit(simple_poll);

1042

1083

} else {

1043

1084

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

1044

avahi_proto_to_af(proto))){

1085

avahi_proto_to_af(proto),

1086

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

1045

1087

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

1046

1088

" list\n", name);

1047

1089

}

1060

1102

const char *domain,

1061

1103

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

1104

flags,

1063

AVAHI_GCC_UNUSED void* userdata){

1105

void* mc){

1064

1106

if(b == NULL){

1065

1107

return;

1066

1108

}

1077

1119

case AVAHI_BROWSER_FAILURE:

1078

1120

1079

1121

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1122

avahi_strerror(avahi_server_errno

1123

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

1124

avahi_simple_poll_quit(simple_poll);

1082

1125

return;

1083

1126

1084

1127

case AVAHI_BROWSER_NEW:

1087

1130

the callback function is called the Avahi server will free the

1088

1131

resolver for us. */

1089

1132

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1133

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

1134

interface, protocol, name, type,

1135

domain, protocol, 0,

1136

resolve_callback, mc) == NULL)

1093

1137

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

1094

1138

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1139

avahi_strerror(avahi_server_errno

1140

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

1096

1141

break;

1097

1142

1098

1143

case AVAHI_BROWSER_REMOVE:

1117

1162

signal_received = sig;

1118

1163

int old_errno = errno;

1119

1164

/* set main loop to exit */

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1165

if(simple_poll != NULL){

1166

avahi_simple_poll_quit(simple_poll);

1122

1167

}

1123

1168

errno = old_errno;

1124

1169

}

1318

1363

return 1;

1319

1364

}

1320

1365

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1366

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1367

mandos_context *mc){

1322

1368

int ret;

1323

1369

struct timespec now;

1324

1370

struct timespec waited_time;

1325

1371

intmax_t block_time;

1326

1372

1327

1373

while(true){

1328

if(mc.current_server == NULL){

1374

if(mc->current_server == NULL){

1329

1375

if (debug){

1330

1376

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

1331

1377

" No timeout!\n");

1345

1391

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

1346

1392

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

1347

1393

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1394

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

1349

1395

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1396

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

1351

1397

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

1352

1398

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

1353

1399

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

1361

1407

}

1362

1408

1363

1409

if(block_time <= 0){

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1410

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

1411

mc->current_server->port,

1412

mc->current_server->if_index,

1413

mc->current_server->af, mc);

1368

1414

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1415

avahi_simple_poll_quit(s);

1370

1416

return 0;

1371

1417

}

1372

1418

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1419

&mc->current_server->last_seen);

1374

1420

if(ret == -1){

1375

1421

perror_plus("clock_gettime");

1376

1422

return -1;

1377

1423

}

1378

mc.current_server = mc.current_server->next;

1424

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

1379

1425

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

1380

1426

servers, but don't block */

1381

1427

}

1445

1491

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

1446

1492

const float delay){

1447

1493

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

1494

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

1451

1495

alphasort);

1452

1496

if(numhooks == -1){

1459

1503

perror_plus("scandir");

1460

1504

}

1461

1505

} else {

1506

struct dirent *direntry;

1507

int ret;

1462

1508

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

1463

1509

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

1464

1510

direntry = direntries[i];

1684

1730

}

1685

1731

1686

1732

error_t take_down_interface(const char *const interface){

1687

int sd = -1;

1688

1733

error_t old_errno = errno;

1689

error_t ret_errno = 0;

1690

int ret, ret_setflags;

1691

1734

struct ifreq network;

1692

1735

unsigned int if_index = if_nametoindex(interface);

1693

1736

if(if_index == 0){

1696

1739

return ENXIO;

1697

1740

}

1698

1741

if(interface_is_up(interface)){

1742

error_t ret_errno = 0;

1699

1743

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

1700

1744

ret_errno = errno;

1701

1745

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

1704

1748

}

1705

1749

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

1706

1750

1707

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

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

1708

1752

if(sd < 0){

1709

1753

ret_errno = errno;

1710

1754

perror_plus("socket");

1720

1764

/* Raise priviliges */

1721

1765

raise_privileges();

1722

1766

1723

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

1767

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

1724

1768

ret_errno = errno;

1725

1769

1726

1770

/* Lower privileges */

1727

1771

lower_privileges();

1728

1772

1729

1773

/* Close the socket */

1730

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

1774

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

1731

1775

if(ret == -1){

1732

1776

perror_plus("close");

1733

1777

}

1748

1792

}

1749

1793

1750

1794

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

1795

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

1796

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

1797

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

1798

.interfaces = NULL, .interfaces_size = 0 };

1751

1799

AvahiSServiceBrowser *sb = NULL;

1752

1800

error_t ret_errno;

1753

1801

int ret;

1754

1802

intmax_t tmpmax;

1755

1803

char *tmp;

1756

1804

int exitcode = EXIT_SUCCESS;

1757

char *interfaces = NULL;

1758

size_t interfaces_size = 0;

1759

1805

char *interfaces_to_take_down = NULL;

1760

1806

size_t interfaces_to_take_down_size = 0;

1761

1807

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

1764

1810

const char *seckey = PATHDIR "/" SECKEY;

1765

1811

const char *pubkey = PATHDIR "/" PUBKEY;

1766

1812

char *interfaces_hooks = NULL;

1767

size_t interfaces_hooks_size = 0;

1768

1813

1769

1814

bool gnutls_initialized = false;

1770

1815

bool gpgme_initialized = false;

1861

1906

connect_to = arg;

1862

1907

break;

1863

1908

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

1864

ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,

1865

(int)',');

1909

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

1910

arg, (int)',');

1866

1911

if(ret_errno != 0){

1867

1912

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

1868

1913

}

1995

2040

}

1996

2041

1997

2042

/* Lower privileges */

1998

errno = 0;

1999

ret = seteuid(uid);

2000

if(ret == -1){

2001

perror_plus("seteuid");

2002

}

2043

lower_privileges();

2003

2044

}

2004

2045

}

2005

2046

2006

/* Remove empty interface names */

2047

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

2007

2048

{

2008

2049

char *interface = NULL;

2009

while((interface = argz_next(interfaces, interfaces_size,

2050

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

2010

2051

interface))){

2011

if(if_nametoindex(interface) == 0){

2012

if(interface[0] != '\0' and strcmp(interface, "none") != 0){

2052

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

2053

and if_nametoindex(interface) == 0){

2054

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

2013

2055

fprintf_plus(stderr, "Not using nonexisting interface"

2014

2056

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

2015

2057

}

2016

argz_delete(&interfaces, &interfaces_size, interface);

2058

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

2017

2059

interface = NULL;

2018

2060

}

2019

2061

}

2021

2063

2022

2064

/* Run network hooks */

2023

2065

{

2024

2025

if(interfaces != NULL){

2026

interfaces_hooks = malloc(interfaces_size);

2066

if(mc.interfaces != NULL){

2067

interfaces_hooks = malloc(mc.interfaces_size);

2027

2068

if(interfaces_hooks == NULL){

2028

2069

perror_plus("malloc");

2029

2070

goto end;

2030

2071

}

2031

memcpy(interfaces_hooks, interfaces, interfaces_size);

2032

interfaces_hooks_size = interfaces_size;

2033

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2034

(int)',');

2072

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

2073

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

2035

2074

}

2036

2075

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

2037

2076

interfaces_hooks : "", delay)){

2047

2086

from the signal handler */

2048

2087

/* Initialize the pseudo-RNG for Avahi */

2049

2088

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

2050

mc.simple_poll = avahi_simple_poll_new();

2051

if(mc.simple_poll == NULL){

2089

simple_poll = avahi_simple_poll_new();

2090

if(simple_poll == NULL){

2052

2091

fprintf_plus(stderr,

2053

2092

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

2054

2093

exitcode = EX_UNAVAILABLE;

2119

2158

}

2120

2159

2121

2160

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

2122

if(interfaces == NULL){

2161

if(mc.interfaces == NULL){

2123

2162

struct dirent **direntries;

2124

2163

/* Look for any good interfaces */

2125

2164

ret = scandir(sys_class_net, &direntries, good_interface,

2127

2166

if(ret >= 1){

2128

2167

/* Add all found interfaces to interfaces list */

2129

2168

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

2130

ret_errno = argz_add(&interfaces, &interfaces_size,

2169

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

2131

2170

direntries[i]->d_name);

2132

2171

if(ret_errno != 0){

2172

errno = ret_errno;

2133

2173

perror_plus("argz_add");

2134

2174

continue;

2135

2175

}

2147

2187

}

2148

2188

}

2149

2189

2150

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

2151

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

2152

if(debug){

2153

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

2154

interfaces);

2155

}

2156

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2157

}

2158

2159

/* Bring up interfaces which are down */

2160

if(not (argz_count(interfaces, interfaces_size) == 1

2161

and strcmp(interfaces, "none") == 0)){

2190

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

2191

{

2162

2192

char *interface = NULL;

2163

while((interface = argz_next(interfaces, interfaces_size,

2193

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

2164

2194

interface))){

2195

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

2196

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

2197

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

2198

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

2199

interface);

2200

interface = NULL;

2201

while((interface = argz_next(mc.interfaces,

2202

mc.interfaces_size, interface))){

2203

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

2204

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

2205

interface);

2206

interface = NULL;

2207

}

2208

}

2209

break;

2210

}

2165

2211

bool interface_was_up = interface_is_up(interface);

2166

2212

ret = bring_up_interface(interface, delay);

2167

2213

if(not interface_was_up){

2172

2218

ret_errno = argz_add(&interfaces_to_take_down,

2173

2219

&interfaces_to_take_down_size,

2174

2220

interface);

2221

if(ret_errno != 0){

2222

errno = ret_errno;

2223

perror_plus("argz_add");

2224

}

2175

2225

}

2176

2226

}

2177

2227

}

2178

free(interfaces);

2179

interfaces = NULL;

2180

interfaces_size = 0;

2181

2228

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

2182

2229

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

2183

2230

}

2184

2231

}

2185

2232

2233

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

2234

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

2235

if(debug){

2236

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

2237

mc.interfaces);

2238

}

2239

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

2240

}

2241

2186

2242

if(quit_now){

2187

2243

goto end;

2188

2244

}

2189

2245

2190

ret = init_gnutls_global(pubkey, seckey);

2246

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

2191

2247

if(ret == -1){

2192

2248

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

2193

2249

exitcode = EX_UNAVAILABLE;

2210

2266

goto end;

2211

2267

}

2212

2268

2213

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

2269

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

2214

2270

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

2215

2271

exitcode = EX_UNAVAILABLE;

2216

2272

goto end;

2246

2302

exitcode = EX_USAGE;

2247

2303

goto end;

2248

2304

}

2249

2305

2250

2306

if(quit_now){

2251

2307

goto end;

2252

2308

}

2273

2329

}

2274

2330

2275

2331

while(not quit_now){

2276

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

2332

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

2333

&mc);

2277

2334

if(quit_now or ret == 0){

2278

2335

break;

2279

2336

}

2281

2338

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

2282

2339

(int)retry_interval);

2283

2340

}

2284

sleep((int)retry_interval);

2341

sleep((unsigned int)retry_interval);

2285

2342

}

2286

2343

2287

2344

if (not quit_now){

2305

2362

config.publish_domain = 0;

2306

2363

2307

2364

/* Allocate a new server */

2308

mc.server = avahi_server_new(avahi_simple_poll_get

2309

(mc.simple_poll), &config, NULL,

2310

NULL, &ret_errno);

2365

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2366

&config, NULL, NULL, &ret_errno);

2311

2367

2312

2368

/* Free the Avahi configuration data */

2313

2369

avahi_server_config_free(&config);

2328

2384

/* Create the Avahi service browser */

2329

2385

sb = avahi_s_service_browser_new(mc.server, if_index,

2330

2386

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2331

NULL, 0, browse_callback, NULL);

2387

NULL, 0, browse_callback,

2388

(void *)&mc);

2332

2389

if(sb == NULL){

2333

2390

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

2334

2391

avahi_strerror(avahi_server_errno(mc.server)));

2346

2403

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

2347

2404

}

2348

2405

2349

ret = avahi_loop_with_timeout(mc.simple_poll,

2350

(int)(retry_interval * 1000));

2406

ret = avahi_loop_with_timeout(simple_poll,

2407

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

2351

2408

if(debug){

2352

2409

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

2353

2410

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

2360

2417

}

2361

2418

2362

2419

/* Cleanup things */

2420

free(mc.interfaces);

2421

2363

2422

if(sb != NULL)

2364

2423

avahi_s_service_browser_free(sb);

2365

2424

2366

2425

if(mc.server != NULL)

2367

2426

avahi_server_free(mc.server);

2368

2427

2369

if(mc.simple_poll != NULL)

2370

avahi_simple_poll_free(mc.simple_poll);

2428

if(simple_poll != NULL)

2429

avahi_simple_poll_free(simple_poll);

2371

2430

2372

2431

if(gnutls_initialized){

2373

2432

gnutls_certificate_free_credentials(mc.cred);