/mandos/trunk : revision 690

9

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

10

*

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* Everything else is

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13

12

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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,

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inet_pton(), connect() */

58

inet_pton(), connect(),

59

getnameinfo() */

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

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61

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

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62

*/

73

74

#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() */

77

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

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

78

79

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

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80

argp_state, struct argp,

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argz_delete(), argz_append(),

92

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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#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;

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160

AvahiServer *server;

159

161

gnutls_certificate_credentials_t cred;

160

162

unsigned int dh_bits;

162

164

const char *priority;

163

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gpgme_ctx_t ctx;

164

166

server *current_server;

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char *interfaces;

168

size_t interfaces_size;

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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",

171

.current_server = NULL };

171

/* global so signal handler can reach it*/

172

AvahiSimplePoll *simple_poll;

172

173

174

sig_atomic_t quit_now = 0;

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175

int signal_received = 0;

182

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perror(print_text);

183

184

}

184

185

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

186

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

186

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

187

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va_list ap;

188

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va_start (ap, format);

189

190

191

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

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192

program_invocation_short_name));

192

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

193

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

193

194

}

194

195

196

/*

197

198

* bytes. "buffer_capacity" is how much is currently allocated,

198

199

* "buffer_length" is how much is already used.

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200

*/

201

__attribute__((nonnull, warn_unused_result))

200

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size_t incbuffer(char **buffer, size_t buffer_length,

201

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size_t buffer_capacity){

202

204

if(buffer_length + BUFFER_SIZE > buffer_capacity){

203

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

204

if(buffer == NULL){

205

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

206

if(new_buf == NULL){

207

int old_errno = errno;

208

free(*buffer);

209

errno = old_errno;

210

*buffer = NULL;

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return 0;

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212

}

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*buffer = new_buf;

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214

buffer_capacity += BUFFER_SIZE;

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215

}

209

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return buffer_capacity;

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217

}

211

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212

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/* Add server to set of servers to retry periodically */

220

__attribute__((nonnull, warn_unused_result))

213

221

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

214

int af){

222

int af, server **current_server){

215

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int ret;

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224

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

217

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if(new_server == NULL){

226

234

perror_plus("strdup");

227

235

return false;

228

236

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

229

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/* Special case of first server */

230

if (mc.current_server == NULL){

243

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

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*current_server = new_server;

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247

} else {

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new_server->next = mc.current_server;

237

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

248

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

249

new_server->next = *current_server;

250

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

238

251

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;

252

(*current_server)->prev = new_server;

245

253

}

246

254

return true;

247

255

}

249

257

/*

250

258

* Initialize GPGME.

251

259

*/

252

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

253

const char *tempdir){

260

__attribute__((nonnull, warn_unused_result))

261

static bool init_gpgme(const char * const seckey,

262

const char * const pubkey,

263

const char * const tempdir,

264

mandos_context *mc){

254

265

gpgme_error_t rc;

255

266

gpgme_engine_info_t engine_info;

256

267

257

258

268

/*

259

269

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

260

270

*/

261

bool import_key(const char *filename){

271

bool import_key(const char * const filename){

262

272

int ret;

263

273

int fd;

264

274

gpgme_data_t pgp_data;

276

286

return false;

277

287

}

278

288

279

rc = gpgme_op_import(mc.ctx, pgp_data);

289

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

280

290

if(rc != GPG_ERR_NO_ERROR){

281

291

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

282

292

gpgme_strsource(rc), gpgme_strerror(rc));

326

336

}

327

337

328

338

/* Create new GPGME "context" */

329

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

339

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

330

340

if(rc != GPG_ERR_NO_ERROR){

331

341

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

332

342

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

345

355

* Decrypt OpenPGP data.

346

356

* Returns -1 on error

347

357

*/

358

__attribute__((nonnull, warn_unused_result))

348

359

static ssize_t pgp_packet_decrypt(const char *cryptotext,

349

360

size_t crypto_size,

350

char **plaintext){

361

char **plaintext,

362

mandos_context *mc){

351

363

gpgme_data_t dh_crypto, dh_plain;

352

364

gpgme_error_t rc;

353

365

ssize_t ret;

379

391

380

392

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

381

393

data buffer */

382

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

394

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

383

395

if(rc != GPG_ERR_NO_ERROR){

384

396

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

385

397

gpgme_strsource(rc), gpgme_strerror(rc));

386

398

plaintext_length = -1;

387

399

if(debug){

388

400

gpgme_decrypt_result_t result;

389

result = gpgme_op_decrypt_result(mc.ctx);

401

result = gpgme_op_decrypt_result(mc->ctx);

390

402

if(result == NULL){

391

403

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

392

404

} else {

469

481

return plaintext_length;

470

482

}

471

483

472

static const char * safer_gnutls_strerror(int value){

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

473

486

const char *ret = gnutls_strerror(value);

474

487

if(ret == NULL)

475

488

ret = "(unknown)";

477

490

}

478

491

479

492

/* GnuTLS log function callback */

493

__attribute__((nonnull))

480

494

static void debuggnutls(__attribute__((unused)) int level,

481

495

const char* string){

482

496

fprintf_plus(stderr, "GnuTLS: %s", string);

483

497

}

484

498

499

__attribute__((nonnull, warn_unused_result))

485

500

static int init_gnutls_global(const char *pubkeyfilename,

486

const char *seckeyfilename){

501

const char *seckeyfilename,

502

mandos_context *mc){

487

503

int ret;

488

504

489

505

if(debug){

506

522

}

507

523

508

524

/* OpenPGP credentials */

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

525

ret = gnutls_certificate_allocate_credentials(&mc->cred);

510

526

if(ret != GNUTLS_E_SUCCESS){

511

527

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

512

528

safer_gnutls_strerror(ret));

522

538

}

523

539

524

540

ret = gnutls_certificate_set_openpgp_key_file

525

(mc.cred, pubkeyfilename, seckeyfilename,

541

(mc->cred, pubkeyfilename, seckeyfilename,

526

542

GNUTLS_OPENPGP_FMT_BASE64);

527

543

if(ret != GNUTLS_E_SUCCESS){

528

544

fprintf_plus(stderr,

534

550

}

535

551

536

552

/* GnuTLS server initialization */

537

ret = gnutls_dh_params_init(&mc.dh_params);

553

ret = gnutls_dh_params_init(&mc->dh_params);

538

554

if(ret != GNUTLS_E_SUCCESS){

539

555

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

540

556

" initialization: %s\n",

541

557

safer_gnutls_strerror(ret));

542

558

goto globalfail;

543

559

}

544

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

560

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

545

561

if(ret != GNUTLS_E_SUCCESS){

546

562

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

547

563

safer_gnutls_strerror(ret));

548

564

goto globalfail;

549

565

}

550

566

551

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

567

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

552

568

553

569

return 0;

554

570

555

571

globalfail:

556

572

557

gnutls_certificate_free_credentials(mc.cred);

573

gnutls_certificate_free_credentials(mc->cred);

558

574

gnutls_global_deinit();

559

gnutls_dh_params_deinit(mc.dh_params);

575

gnutls_dh_params_deinit(mc->dh_params);

560

576

return -1;

561

577

}

562

578

563

static int init_gnutls_session(gnutls_session_t *session){

579

__attribute__((nonnull, warn_unused_result))

580

static int init_gnutls_session(gnutls_session_t *session,

581

mandos_context *mc){

564

582

int ret;

565

583

/* GnuTLS session creation */

566

584

do {

578

596

{

579

597

const char *err;

580

598

do {

581

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

599

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

582

600

if(quit_now){

583

601

gnutls_deinit(*session);

584

602

return -1;

595

613

596

614

do {

597

615

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc.cred);

616

mc->cred);

599

617

if(quit_now){

600

618

gnutls_deinit(*session);

601

619

return -1;

611

629

/* ignore client certificate if any. */

612

630

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

631

614

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

633

616

634

return 0;

617

635

}

621

639

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

622

640

623

641

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

624

643

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

625

644

AvahiIfIndex if_index,

626

int af){

645

int af, mandos_context *mc){

627

646

int ret, tcp_sd = -1;

628

647

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

648

struct sockaddr_storage to;

633

649

char *buffer = NULL;

634

650

char *decrypted_buffer = NULL;

635

651

size_t buffer_length = 0;

659

675

return -1;

660

676

}

661

677

662

ret = init_gnutls_session(&session);

678

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

679

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

680

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

681

bool match = false;

682

{

683

char *interface = NULL;

684

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

685

interface))){

686

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

687

match = true;

688

break;

689

}

690

}

691

}

692

if(not match){

693

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

694

connect to the server */

695

if(debug){

696

char interface[IF_NAMESIZE];

697

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

698

perror_plus("if_indextoname");

699

} else {

700

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

701

" \"%s\"\n",

702

if_indextoname((unsigned int)if_index,

703

interface));

704

}

705

}

706

return -1;

707

}

708

}

709

710

ret = init_gnutls_session(&session, mc);

663

711

if(ret != 0){

664

712

return -1;

665

713

}

684

732

685

733

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

686

734

if(af == AF_INET6){

687

to.in6.sin6_family = (sa_family_t)af;

688

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

735

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

736

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

689

737

} else { /* IPv4 */

690

to.in.sin_family = (sa_family_t)af;

691

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

738

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

739

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

692

740

}

693

741

if(ret < 0 ){

694

742

int e = errno;

703

751

goto mandos_end;

704

752

}

705

753

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*/

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

710

757

if(if_index == AVAHI_IF_UNSPEC){

711

758

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

712

759

" incomplete without a network interface\n");

714

761

goto mandos_end;

715

762

}

716

763

/* Set the network interface number as scope */

717

to.in6.sin6_scope_id = (uint32_t)if_index;

764

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

718

765

}

719

766

} else {

720

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

721

-Wconversion and

722

-Wunreachable-code */

767

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

723

768

}

724

769

725

770

if(quit_now){

742

787

}

743

788

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

744

789

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

745

const char *pcret;

746

790

if(af == AF_INET6){

747

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

748

sizeof(addrstr));

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

749

795

} else {

750

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

751

sizeof(addrstr));

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

752

800

}

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

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

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

805

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

806

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

759

807

}

760

808

}

761

809

765

813

}

766

814

767

815

if(af == AF_INET6){

768

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

816

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

817

sizeof(struct sockaddr_in6));

769

818

} else {

770

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

819

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

820

sizeof(struct sockaddr_in));

771

821

}

772

822

if(ret < 0){

773

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

823

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

774

824

int e = errno;

775

825

perror_plus("connect");

776

826

errno = e;

937

987

if(buffer_length > 0){

938

988

ssize_t decrypted_buffer_size;

939

989

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

940

&decrypted_buffer);

990

&decrypted_buffer, mc);

941

991

if(decrypted_buffer_size >= 0){

942

992

943

993

written = 0;

991

1041

return retval;

992

1042

}

993

1043

1044

__attribute__((nonnull))

994

1045

static void resolve_callback(AvahiSServiceResolver *r,

995

1046

AvahiIfIndex interface,

996

1047

AvahiProtocol proto,

1004

1055

AVAHI_GCC_UNUSED AvahiStringList *txt,

1005

1056

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

1057

flags,

1007

AVAHI_GCC_UNUSED void* userdata){

1058

void *mc){

1008

1059

if(r == NULL){

1009

1060

return;

1010

1061

}

1022

1073

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

1023

1074

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

1024

1075

domain,

1025

avahi_strerror(avahi_server_errno(mc.server)));

1076

avahi_strerror(avahi_server_errno

1077

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

1026

1078

break;

1027

1079

1028

1080

case AVAHI_RESOLVER_FOUND:

1036

1088

}

1037

1089

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

1038

1090

interface,

1039

avahi_proto_to_af(proto));

1091

avahi_proto_to_af(proto),

1092

mc);

1040

1093

if(ret == 0){

1041

avahi_simple_poll_quit(mc.simple_poll);

1094

avahi_simple_poll_quit(simple_poll);

1042

1095

} else {

1043

1096

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

1044

avahi_proto_to_af(proto))){

1097

avahi_proto_to_af(proto),

1098

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

1045

1099

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

1046

1100

" list\n", name);

1047

1101

}

1060

1114

const char *domain,

1061

1115

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

1116

flags,

1063

AVAHI_GCC_UNUSED void* userdata){

1117

void *mc){

1064

1118

if(b == NULL){

1065

1119

return;

1066

1120

}

1077

1131

case AVAHI_BROWSER_FAILURE:

1078

1132

1079

1133

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1134

avahi_strerror(avahi_server_errno

1135

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

1136

avahi_simple_poll_quit(simple_poll);

1082

1137

return;

1083

1138

1084

1139

case AVAHI_BROWSER_NEW:

1087

1142

the callback function is called the Avahi server will free the

1088

1143

resolver for us. */

1089

1144

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1145

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

1146

interface, protocol, name, type,

1147

domain, protocol, 0,

1148

resolve_callback, mc) == NULL)

1093

1149

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

1094

1150

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1151

avahi_strerror(avahi_server_errno

1152

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

1096

1153

break;

1097

1154

1098

1155

case AVAHI_BROWSER_REMOVE:

1117

1174

signal_received = sig;

1118

1175

int old_errno = errno;

1119

1176

/* set main loop to exit */

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1177

if(simple_poll != NULL){

1178

avahi_simple_poll_quit(simple_poll);

1122

1179

}

1123

1180

errno = old_errno;

1124

1181

}

1125

1182

1183

__attribute__((nonnull, warn_unused_result))

1126

1184

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

1127

1185

int ret;

1128

1186

error_t ret_errno;

1147

1205

return true;

1148

1206

}

1149

1207

1208

__attribute__((nonnull, warn_unused_result))

1150

1209

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

1151

1210

1152

1211

/* Reject the loopback device */

1194

1253

* corresponds to an acceptable network device.

1195

1254

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

1196

1255

*/

1256

__attribute__((nonnull, warn_unused_result))

1197

1257

int good_interface(const struct dirent *if_entry){

1198

1258

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

1199

1259

return 0;

1217

1277

/*

1218

1278

* This function determines if a network interface is up.

1219

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1220

1281

bool interface_is_up(const char *interface){

1221

1282

struct ifreq ifr;

1222

1283

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

1233

1294

/*

1234

1295

* This function determines if a network interface is running

1235

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1236

1298

bool interface_is_running(const char *interface){

1237

1299

struct ifreq ifr;

1238

1300

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

1246

1308

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

1247

1309

}

1248

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1249

1312

int notdotentries(const struct dirent *direntry){

1250

1313

/* Skip "." and ".." */

1251

1314

if(direntry->d_name[0] == '.'

1258

1321

}

1259

1322

1260

1323

/* Is this directory entry a runnable program? */

1324

__attribute__((nonnull, warn_unused_result))

1261

1325

int runnable_hook(const struct dirent *direntry){

1262

1326

int ret;

1263

1327

size_t sret;

1271

1335

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1272

1336

"abcdefghijklmnopqrstuvwxyz"

1273

1337

"0123456789"

1274

"_-");

1338

"_.-");

1275

1339

if((direntry->d_name)[sret] != '\0'){

1276

1340

/* Contains non-allowed characters */

1277

1341

if(debug){

1295

1359

}

1296

1360

return 0;

1297

1361

}

1362

free(fullname);

1298

1363

if(not (S_ISREG(st.st_mode))){

1299

1364

/* Not a regular file */

1300

1365

if(debug){

1318

1383

return 1;

1319

1384

}

1320

1385

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1386

__attribute__((nonnull, warn_unused_result))

1387

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1388

mandos_context *mc){

1322

1389

int ret;

1323

1390

struct timespec now;

1324

1391

struct timespec waited_time;

1325

1392

intmax_t block_time;

1326

1393

1327

1394

while(true){

1328

if(mc.current_server == NULL){

1329

if (debug){

1395

if(mc->current_server == NULL){

1396

if(debug){

1330

1397

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

1331

1398

" No timeout!\n");

1332

1399

}

1333

1400

ret = avahi_simple_poll_iterate(s, -1);

1334

1401

} else {

1335

if (debug){

1402

if(debug){

1336

1403

fprintf_plus(stderr, "Check current_server if we should run"

1337

1404

" it, or wait\n");

1338

1405

}

1345

1412

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

1346

1413

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

1347

1414

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1415

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

1349

1416

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1417

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

1351

1418

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

1352

1419

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

1353

1420

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

1355

1422

- ((intmax_t)waited_time.tv_sec * 1000))

1356

1423

- ((intmax_t)waited_time.tv_nsec / 1000000));

1357

1424

1358

if (debug){

1425

if(debug){

1359

1426

fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",

1360

1427

block_time);

1361

1428

}

1362

1429

1363

1430

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);

1431

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

1432

mc->current_server->port,

1433

mc->current_server->if_index,

1434

mc->current_server->af, mc);

1368

1435

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1436

avahi_simple_poll_quit(s);

1370

1437

return 0;

1371

1438

}

1372

1439

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1440

&mc->current_server->last_seen);

1374

1441

if(ret == -1){

1375

1442

perror_plus("clock_gettime");

1376

1443

return -1;

1377

1444

}

1378

mc.current_server = mc.current_server->next;

1445

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

1379

1446

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

1380

1447

servers, but don't block */

1381

1448

}

1383

1450

ret = avahi_simple_poll_iterate(s, (int)block_time);

1384

1451

}

1385

1452

if(ret != 0){

1386

if (ret > 0 or errno != EINTR){

1453

if(ret > 0 or errno != EINTR){

1387

1454

return (ret != 1) ? ret : 0;

1388

1455

}

1389

1456

}

1391

1458

}

1392

1459

1393

1460

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

1461

__attribute__((warn_unused_result))

1394

1462

error_t raise_privileges(void){

1395

1463

error_t old_errno = errno;

1396

1464

error_t ret_errno = 0;

1403

1471

}

1404

1472

1405

1473

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

1474

__attribute__((warn_unused_result))

1406

1475

error_t raise_privileges_permanently(void){

1407

1476

error_t old_errno = errno;

1408

1477

error_t ret_errno = raise_privileges();

1419

1488

}

1420

1489

1421

1490

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

1491

__attribute__((warn_unused_result))

1422

1492

error_t lower_privileges(void){

1423

1493

error_t old_errno = errno;

1424

1494

error_t ret_errno = 0;

1431

1501

}

1432

1502

1433

1503

/* Lower privileges permanently */

1504

__attribute__((warn_unused_result))

1434

1505

error_t lower_privileges_permanently(void){

1435

1506

error_t old_errno = errno;

1436

1507

error_t ret_errno = 0;

1442

1513

return ret_errno;

1443

1514

}

1444

1515

1445

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

1516

__attribute__((nonnull))

1517

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

1446

1518

const float delay){

1447

1519

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

1520

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

1451

1521

alphasort);

1452

1522

if(numhooks == -1){

1453

perror_plus("scandir");

1523

if(errno == ENOENT){

1524

if(debug){

1525

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

1526

" found\n", hookdir);

1527

}

1528

} else {

1529

perror_plus("scandir");

1530

}

1454

1531

} else {

1532

struct dirent *direntry;

1533

int ret;

1455

1534

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

1456

1535

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

1457

1536

direntry = direntries[i];

1469

1548

if(hook_pid == 0){

1470

1549

/* Child */

1471

1550

/* Raise privileges */

1472

raise_privileges_permanently();

1551

if(raise_privileges_permanently() != 0){

1552

perror_plus("Failed to raise privileges");

1553

_exit(EX_NOPERM);

1554

}

1473

1555

/* Set group */

1474

1556

errno = 0;

1475

1557

ret = setgid(0);

1476

1558

if(ret == -1){

1477

1559

perror_plus("setgid");

1560

_exit(EX_NOPERM);

1478

1561

}

1479

1562

/* Reset supplementary groups */

1480

1563

errno = 0;

1481

1564

ret = setgroups(0, NULL);

1482

1565

if(ret == -1){

1483

1566

perror_plus("setgroups");

1484

}

1485

dup2(devnull, STDIN_FILENO);

1486

close(devnull);

1487

dup2(STDERR_FILENO, STDOUT_FILENO);

1567

_exit(EX_NOPERM);

1568

}

1569

ret = dup2(devnull, STDIN_FILENO);

1570

if(ret == -1){

1571

perror_plus("dup2(devnull, STDIN_FILENO)");

1572

_exit(EX_OSERR);

1573

}

1574

ret = close(devnull);

1575

if(ret == -1){

1576

perror_plus("close");

1577

_exit(EX_OSERR);

1578

}

1579

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1580

if(ret == -1){

1581

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1582

_exit(EX_OSERR);

1583

}

1488

1584

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

1489

1585

if(ret == -1){

1490

1586

perror_plus("setenv");

1506

1602

_exit(EX_OSERR);

1507

1603

}

1508

1604

char *delaystring;

1509

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

1605

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

1510

1606

if(ret == -1){

1511

1607

perror_plus("asprintf");

1512

1608

_exit(EX_OSERR);

1565

1661

}

1566

1662

close(devnull);

1567

1663

}

1568

return true;

1569

1664

}

1570

1665

1666

__attribute__((nonnull, warn_unused_result))

1571

1667

error_t bring_up_interface(const char *const interface,

1572

1668

const float delay){

1573

int sd = -1;

1574

1669

error_t old_errno = errno;

1575

error_t ret_errno = 0;

1576

int ret, ret_setflags;

1670

int ret;

1577

1671

struct ifreq network;

1578

1672

unsigned int if_index = if_nametoindex(interface);

1579

1673

if(if_index == 0){

1588

1682

}

1589

1683

1590

1684

if(not interface_is_up(interface)){

1591

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

1685

error_t ret_errno = 0, ioctl_errno = 0;

1686

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

1592

1687

ret_errno = errno;

1593

1688

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

1594

1689

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

1690

errno = old_errno;

1595

1691

return ret_errno;

1596

1692

}

1597

network.ifr_flags |= IFF_UP;

1693

network.ifr_flags |= IFF_UP; /* set flag */

1598

1694

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

1695

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

1696

if(sd == -1){

1601

1697

ret_errno = errno;

1602

1698

perror_plus("socket");

1603

1699

errno = old_errno;

1604

1700

return ret_errno;

1605

1701

}

1606

1702

1607

1703

if(quit_now){

1608

close(sd);

1704

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

1705

if(ret == -1){

1706

perror_plus("close");

1707

}

1609

1708

errno = old_errno;

1610

1709

return EINTR;

1611

1710

}

1615

1714

interface);

1616

1715

}

1617

1716

1618

/* Raise priviliges */

1619

raise_privileges();

1717

/* Raise privileges */

1718

ret_errno = raise_privileges();

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1620

1722

1621

1723

#ifdef __linux__

1622

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1623

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

1624

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

1625

bool restore_loglevel = true;

1626

if(ret_linux == -1){

1627

restore_loglevel = false;

1628

perror_plus("klogctl");

1724

int ret_linux;

1725

bool restore_loglevel = false;

1726

if(ret_errno == 0){

1727

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1728

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

1729

ret_linux = klogctl(8, NULL, 5);

1730

if(ret_linux == -1){

1731

perror_plus("klogctl");

1732

} else {

1733

restore_loglevel = true;

1734

}

1629

1735

}

1630

1736

#endif /* __linux__ */

1631

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

1632

ret_errno = errno;

1737

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

1738

ioctl_errno = errno;

1633

1739

#ifdef __linux__

1634

1740

if(restore_loglevel){

1635

1741

ret_linux = klogctl(7, NULL, 0);

1639

1745

}

1640

1746

#endif /* __linux__ */

1641

1747

1642

/* Lower privileges */

1643

lower_privileges();

1748

/* If raise_privileges() succeeded above */

1749

if(ret_errno == 0){

1750

/* Lower privileges */

1751

ret_errno = lower_privileges();

1752

if(ret_errno != 0){

1753

errno = ret_errno;

1754

perror_plus("Failed to lower privileges");

1755

}

1756

}

1644

1757

1645

1758

/* Close the socket */

1646

1759

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

1649

1762

}

1650

1763

1651

1764

if(ret_setflags == -1){

1652

errno = ret_errno;

1765

errno = ioctl_errno;

1653

1766

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1654

1767

errno = old_errno;

1655

return ret_errno;

1768

return ioctl_errno;

1656

1769

}

1657

1770

} else if(debug){

1658

1771

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

1676

1789

return 0;

1677

1790

}

1678

1791

1792

__attribute__((nonnull, warn_unused_result))

1679

1793

error_t take_down_interface(const char *const interface){

1680

int sd = -1;

1681

1794

error_t old_errno = errno;

1682

error_t ret_errno = 0;

1683

int ret, ret_setflags;

1684

1795

struct ifreq network;

1685

1796

unsigned int if_index = if_nametoindex(interface);

1686

1797

if(if_index == 0){

1689

1800

return ENXIO;

1690

1801

}

1691

1802

if(interface_is_up(interface)){

1803

error_t ret_errno = 0, ioctl_errno = 0;

1692

1804

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

1693

1805

ret_errno = errno;

1694

1806

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

1695

1807

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

1808

errno = old_errno;

1696

1809

return ret_errno;

1697

1810

}

1698

1811

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

1699

1812

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

1813

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

1814

if(sd == -1){

1702

1815

ret_errno = errno;

1703

1816

perror_plus("socket");

1704

1817

errno = old_errno;

1710

1823

interface);

1711

1824

}

1712

1825

1713

/* Raise priviliges */

1714

raise_privileges();

1715

1716

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

1717

ret_errno = errno;

1718

1719

/* Lower privileges */

1720

lower_privileges();

1826

/* Raise privileges */

1827

ret_errno = raise_privileges();

1828

if(ret_errno != 0){

1829

perror_plus("Failed to raise privileges");

1830

}

1831

1832

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

1833

ioctl_errno = errno;

1834

1835

/* If raise_privileges() succeeded above */

1836

if(ret_errno == 0){

1837

/* Lower privileges */

1838

ret_errno = lower_privileges();

1839

if(ret_errno != 0){

1840

errno = ret_errno;

1841

perror_plus("Failed to lower privileges");

1842

}

1843

}

1721

1844

1722

1845

/* Close the socket */

1723

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

1846

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

1724

1847

if(ret == -1){

1725

1848

perror_plus("close");

1726

1849

}

1727

1850

1728

1851

if(ret_setflags == -1){

1729

errno = ret_errno;

1852

errno = ioctl_errno;

1730

1853

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1731

1854

errno = old_errno;

1732

return ret_errno;

1855

return ioctl_errno;

1733

1856

}

1734

1857

} else if(debug){

1735

1858

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

1741

1864

}

1742

1865

1743

1866

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

1867

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

1868

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

1869

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

1870

.interfaces = NULL, .interfaces_size = 0 };

1744

1871

AvahiSServiceBrowser *sb = NULL;

1745

1872

error_t ret_errno;

1746

1873

int ret;

1747

1874

intmax_t tmpmax;

1748

1875

char *tmp;

1749

1876

int exitcode = EXIT_SUCCESS;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

1752

1877

char *interfaces_to_take_down = NULL;

1753

1878

size_t interfaces_to_take_down_size = 0;

1754

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

1755

bool tempdir_created = false;

1879

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

1880

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

1881

char *tempdir = NULL;

1756

1882

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1757

1883

const char *seckey = PATHDIR "/" SECKEY;

1758

1884

const char *pubkey = PATHDIR "/" PUBKEY;

1759

1885

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

1761

1886

1762

1887

bool gnutls_initialized = false;

1763

1888

bool gpgme_initialized = false;

1854

1979

connect_to = arg;

1855

1980

break;

1856

1981

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

1857

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

1858

(int)',');

1982

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

1983

arg, (int)',');

1859

1984

if(ret_errno != 0){

1860

1985

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

1861

1986

}

1941

2066

/* Work around Debian bug #633582:

1942

2067

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

1943

2068

1944

/* Re-raise priviliges */

1945

if(raise_privileges() == 0){

2069

/* Re-raise privileges */

2070

ret_errno = raise_privileges();

2071

if(ret_errno != 0){

2072

errno = ret_errno;

2073

perror_plus("Failed to raise privileges");

2074

} else {

1946

2075

struct stat st;

1947

2076

1948

2077

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

1988

2117

}

1989

2118

1990

2119

/* Lower privileges */

1991

errno = 0;

1992

ret = seteuid(uid);

1993

if(ret == -1){

1994

perror_plus("seteuid");

2120

ret_errno = lower_privileges();

2121

if(ret_errno != 0){

2122

errno = ret_errno;

2123

perror_plus("Failed to lower privileges");

1995

2124

}

1996

2125

}

1997

2126

}

1998

2127

1999

/* Remove empty interface names */

2128

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

2000

2129

{

2001

2130

char *interface = NULL;

2002

while((interface = argz_next(interfaces, interfaces_size,

2131

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

2003

2132

interface))){

2004

if(if_nametoindex(interface) == 0){

2005

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

2133

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

2134

and if_nametoindex(interface) == 0){

2135

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

2006

2136

fprintf_plus(stderr, "Not using nonexisting interface"

2007

2137

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

2008

2138

}

2009

argz_delete(&interfaces, &interfaces_size, interface);

2139

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

2010

2140

interface = NULL;

2011

2141

}

2012

2142

}

2014

2144

2015

2145

/* Run network hooks */

2016

2146

{

2017

ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,

2018

interfaces, interfaces_size);

2019

if(ret_errno != 0){

2020

errno = ret_errno;

2021

perror_plus("argz_append");

2022

goto end;

2023

}

2024

argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');

2025

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

2026

goto end;

2027

}

2147

if(mc.interfaces != NULL){

2148

interfaces_hooks = malloc(mc.interfaces_size);

2149

if(interfaces_hooks == NULL){

2150

perror_plus("malloc");

2151

goto end;

2152

}

2153

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

2154

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

2155

}

2156

run_network_hooks("start", interfaces_hooks != NULL ?

2157

interfaces_hooks : "", delay);

2028

2158

}

2029

2159

2030

2160

if(not debug){

2035

2165

from the signal handler */

2036

2166

/* Initialize the pseudo-RNG for Avahi */

2037

2167

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

2038

mc.simple_poll = avahi_simple_poll_new();

2039

if(mc.simple_poll == NULL){

2168

simple_poll = avahi_simple_poll_new();

2169

if(simple_poll == NULL){

2040

2170

fprintf_plus(stderr,

2041

2171

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

2042

2172

exitcode = EX_UNAVAILABLE;

2107

2237

}

2108

2238

2109

2239

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

2110

if(interfaces == NULL){

2240

if(mc.interfaces == NULL){

2111

2241

struct dirent **direntries;

2112

2242

/* Look for any good interfaces */

2113

2243

ret = scandir(sys_class_net, &direntries, good_interface,

2115

2245

if(ret >= 1){

2116

2246

/* Add all found interfaces to interfaces list */

2117

2247

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

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2248

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

2119

2249

direntries[i]->d_name);

2120

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2121

2252

perror_plus("argz_add");

2122

2253

continue;

2123

2254

}

2135

2266

}

2136

2267

}

2137

2268

2138

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

2139

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

2140

if(debug){

2141

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

2142

interfaces);

2143

}

2144

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2145

}

2146

2147

/* Bring up interfaces which are down */

2148

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

2149

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

2269

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

2270

{

2150

2271

char *interface = NULL;

2151

while((interface = argz_next(interfaces, interfaces_size,

2272

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

2152

2273

interface))){

2274

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

2275

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

2276

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

2277

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

2278

interface);

2279

interface = NULL;

2280

while((interface = argz_next(mc.interfaces,

2281

mc.interfaces_size, interface))){

2282

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

2283

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

2284

interface);

2285

interface = NULL;

2286

}

2287

}

2288

break;

2289

}

2153

2290

bool interface_was_up = interface_is_up(interface);

2154

ret = bring_up_interface(interface, delay);

2291

errno = bring_up_interface(interface, delay);

2155

2292

if(not interface_was_up){

2156

if(ret != 0){

2157

errno = ret;

2293

if(errno != 0){

2158

2294

perror_plus("Failed to bring up interface");

2159

2295

} else {

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2296

errno = argz_add(&interfaces_to_take_down,

2297

&interfaces_to_take_down_size,

2298

interface);

2299

if(errno != 0){

2300

perror_plus("argz_add");

2301

}

2163

2302

}

2164

2303

}

2165

2304

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2169

2305

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

2170

2306

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

2171

2307

}

2172

2308

}

2173

2309

2310

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

2311

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

2312

if(debug){

2313

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

2314

mc.interfaces);

2315

}

2316

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

2317

}

2318

2174

2319

if(quit_now){

2175

2320

goto end;

2176

2321

}

2177

2322

2178

ret = init_gnutls_global(pubkey, seckey);

2323

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

2179

2324

if(ret == -1){

2180

2325

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

2181

2326

exitcode = EX_UNAVAILABLE;

2188

2333

goto end;

2189

2334

}

2190

2335

2191

if(mkdtemp(tempdir) == NULL){

2336

/* Try /run/tmp before /tmp */

2337

tempdir = mkdtemp(run_tempdir);

2338

if(tempdir == NULL and errno == ENOENT){

2339

if(debug){

2340

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2341

run_tempdir, old_tempdir);

2342

}

2343

tempdir = mkdtemp(old_tempdir);

2344

}

2345

if(tempdir == NULL){

2192

2346

perror_plus("mkdtemp");

2193

2347

goto end;

2194

2348

}

2195

tempdir_created = true;

2196

2349

2197

2350

if(quit_now){

2198

2351

goto end;

2199

2352

}

2200

2353

2201

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

2354

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

2202

2355

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

2203

2356

exitcode = EX_UNAVAILABLE;

2204

2357

goto end;

2234

2387

exitcode = EX_USAGE;

2235

2388

goto end;

2236

2389

}

2237

2390

2238

2391

if(quit_now){

2239

2392

goto end;

2240

2393

}

2261

2414

}

2262

2415

2263

2416

while(not quit_now){

2264

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

2417

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

2418

&mc);

2265

2419

if(quit_now or ret == 0){

2266

2420

break;

2267

2421

}

2269

2423

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

2270

2424

(int)retry_interval);

2271

2425

}

2272

sleep((int)retry_interval);

2426

sleep((unsigned int)retry_interval);

2273

2427

}

2274

2428

2275

if (not quit_now){

2429

if(not quit_now){

2276

2430

exitcode = EXIT_SUCCESS;

2277

2431

}

2278

2432

2293

2447

config.publish_domain = 0;

2294

2448

2295

2449

/* Allocate a new server */

2296

mc.server = avahi_server_new(avahi_simple_poll_get

2297

(mc.simple_poll), &config, NULL,

2298

NULL, &ret_errno);

2450

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2451

&config, NULL, NULL, &ret_errno);

2299

2452

2300

2453

/* Free the Avahi configuration data */

2301

2454

avahi_server_config_free(&config);

2316

2469

/* Create the Avahi service browser */

2317

2470

sb = avahi_s_service_browser_new(mc.server, if_index,

2318

2471

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2319

NULL, 0, browse_callback, NULL);

2472

NULL, 0, browse_callback,

2473

(void *)&mc);

2320

2474

if(sb == NULL){

2321

2475

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

2322

2476

avahi_strerror(avahi_server_errno(mc.server)));

2333

2487

if(debug){

2334

2488

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

2335

2489

}

2336

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

2338

(int)(retry_interval * 1000));

2490

2491

ret = avahi_loop_with_timeout(simple_poll,

2492

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

2339

2493

if(debug){

2340

2494

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

2341

2495

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

2348

2502

}

2349

2503

2350

2504

/* Cleanup things */

2505

free(mc.interfaces);

2506

2351

2507

if(sb != NULL)

2352

2508

avahi_s_service_browser_free(sb);

2353

2509

2354

2510

if(mc.server != NULL)

2355

2511

avahi_server_free(mc.server);

2356

2512

2357

if(mc.simple_poll != NULL)

2358

avahi_simple_poll_free(mc.simple_poll);

2513

if(simple_poll != NULL)

2514

avahi_simple_poll_free(simple_poll);

2359

2515

2360

2516

if(gnutls_initialized){

2361

2517

gnutls_certificate_free_credentials(mc.cred);

2378

2534

}

2379

2535

}

2380

2536

2381

/* Re-raise priviliges */

2537

/* Re-raise privileges */

2382

2538

{

2383

raise_privileges();

2384

2385

/* Run network hooks */

2386

run_network_hooks("stop", interfaces_hooks, delay);

2387

2388

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

2389

{

2390

char *interface = NULL;

2391

while((interface=argz_next(interfaces_to_take_down,

2392

interfaces_to_take_down_size,

2393

interface))){

2394

ret_errno = take_down_interface(interface);

2395

if(ret_errno != 0){

2396

errno = ret_errno;

2397

perror_plus("Failed to take down interface");

2398

}

2399

}

2400

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

2401

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

2402

" down\n");

2403

}

2404

}

2405

2406

lower_privileges_permanently();

2539

ret_errno = raise_privileges();

2540

if(ret_errno != 0){

2541

perror_plus("Failed to raise privileges");

2542

} else {

2543

2544

/* Run network hooks */

2545

run_network_hooks("stop", interfaces_hooks != NULL ?

2546

interfaces_hooks : "", delay);

2547

2548

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

2549

{

2550

char *interface = NULL;

2551

while((interface=argz_next(interfaces_to_take_down,

2552

interfaces_to_take_down_size,

2553

interface))){

2554

ret_errno = take_down_interface(interface);

2555

if(ret_errno != 0){

2556

errno = ret_errno;

2557

perror_plus("Failed to take down interface");

2558

}

2559

}

2560

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

2561

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

2562

" down\n");

2563

}

2564

}

2565

}

2566

2567

ret_errno = lower_privileges_permanently();

2568

if(ret_errno != 0){

2569

perror_plus("Failed to lower privileges permanently");

2570

}

2407

2571

}

2408

2572

2409

2573

free(interfaces_to_take_down);

2410

2574

free(interfaces_hooks);

2411

2575

2412

2576

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

2413

if(tempdir_created){

2577

if(tempdir != NULL){

2414

2578

struct dirent **direntries = NULL;

2415

2579

struct dirent *direntry = NULL;

2416

2580

int numentries = scandir(tempdir, &direntries, notdotentries,

2417

2581

alphasort);

2418

if (numentries > 0){

2582

if(numentries > 0){

2419

2583

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

2420

2584

direntry = direntries[i];

2421

2585

char *fullname = NULL;

2433

2597

free(fullname);

2434

2598

}

2435

2599

}

2436

2600

2437

2601

/* need to clean even if 0 because man page doesn't specify */

2438

2602

free(direntries);

2439

if (numentries == -1){

2603

if(numentries == -1){

2440

2604

perror_plus("scandir");

2441

2605

}

2442

2606

ret = rmdir(tempdir);