/mandos/release : revision 237.7.262

9

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

10

*

11

* Everything else is

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13

12

13

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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

32

/* Needed by GPGME, specifically gpgme_data_seek() */

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

38

#endif

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#endif /* not _FILE_OFFSET_BITS */

39

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

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42

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

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stdout, ferror(), remove() */

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stdout, ferror() */

44

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

45

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

46

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

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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() */

59

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

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inet_pton(), connect(),

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getnameinfo() */

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

60

61

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

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62

*/

62

63

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

63

64

strtoimax() */

64

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

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

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program_invocation_short_name */

67

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

73

*/

74

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

75

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

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

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

76

setgid(), pause(), _exit(),

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unlinkat() */

78

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

78

79

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

79

80

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

80

81

argp_state, struct argp,

92

93

argz_delete(), argz_append(),

93

94

argz_stringify(), argz_add(),

94

95

argz_count() */

96

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

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EAI_SYSTEM, gai_strerror() */

95

98

96

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#ifdef __linux__

97

100

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

139

142

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

140

143

char *connect_to = NULL;

141

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

142

146

uid_t uid = 65534;

143

147

gid_t gid = 65534;

144

148

145

149

/* Doubly linked list that need to be circularly linked when used */

146

150

typedef struct server{

147

151

const char *ip;

148

uint16_t port;

152

in_port_t port;

149

153

AvahiIfIndex if_index;

150

154

int af;

151

155

struct timespec last_seen;

155

159

156

160

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

157

161

typedef struct {

158

AvahiSimplePoll *simple_poll;

159

162

AvahiServer *server;

160

163

gnutls_certificate_credentials_t cred;

161

164

unsigned int dh_bits;

163

166

const char *priority;

164

167

gpgme_ctx_t ctx;

165

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

166

171

} mandos_context;

167

172

168

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

169

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

170

.dh_bits = 1024, .priority = "SECURE256"

171

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

172

.current_server = NULL };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

173

175

174

176

sig_atomic_t quit_now = 0;

175

177

int signal_received = 0;

183

185

perror(print_text);

184

186

}

185

187

186

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

188

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

187

189

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

188

190

va_list ap;

189

191

va_start (ap, format);

190

192

191

193

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

192

194

program_invocation_short_name));

193

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

195

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

194

196

}

195

197

196

198

/*

198

200

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

199

201

* "buffer_length" is how much is already used.

200

202

*/

203

__attribute__((nonnull, warn_unused_result))

201

204

size_t incbuffer(char **buffer, size_t buffer_length,

202

205

size_t buffer_capacity){

203

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

204

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

205

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

206

213

return 0;

207

214

}

215

*buffer = new_buf;

208

216

buffer_capacity += BUFFER_SIZE;

209

217

}

210

218

return buffer_capacity;

211

219

}

212

220

213

221

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

214

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

215

int af){

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

216

225

int ret;

217

226

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

218

227

if(new_server == NULL){

225

234

.af = af };

226

235

if(new_server->ip == NULL){

227

236

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

228

252

return false;

229

253

}

230

254

/* Special case of first server */

231

if (mc.current_server == NULL){

255

if(*current_server == NULL){

232

256

new_server->next = new_server;

233

257

new_server->prev = new_server;

234

mc.current_server = new_server;

235

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

258

*current_server = new_server;

236

259

} else {

237

new_server->next = mc.current_server;

238

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

260

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

261

new_server->next = *current_server;

262

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

239

263

new_server->prev->next = new_server;

240

mc.current_server->prev = new_server;

241

}

242

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

243

if(ret == -1){

244

perror_plus("clock_gettime");

245

return false;

264

(*current_server)->prev = new_server;

246

265

}

247

266

return true;

248

267

}

250

269

/*

251

270

* Initialize GPGME.

252

271

*/

253

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

254

const char *tempdir){

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

274

const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

255

277

gpgme_error_t rc;

256

278

gpgme_engine_info_t engine_info;

257

279

258

259

280

/*

260

281

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

261

282

*/

262

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

263

284

int ret;

264

285

int fd;

265

286

gpgme_data_t pgp_data;

277

298

return false;

278

299

}

279

300

280

rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

281

302

if(rc != GPG_ERR_NO_ERROR){

282

303

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

283

304

gpgme_strsource(rc), gpgme_strerror(rc));

327

348

}

328

349

329

350

/* Create new GPGME "context" */

330

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

351

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

331

352

if(rc != GPG_ERR_NO_ERROR){

332

353

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

333

354

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

346

367

* Decrypt OpenPGP data.

347

368

* Returns -1 on error

348

369

*/

370

__attribute__((nonnull, warn_unused_result))

349

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

350

372

size_t crypto_size,

351

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

352

375

gpgme_data_t dh_crypto, dh_plain;

353

376

gpgme_error_t rc;

354

377

ssize_t ret;

380

403

381

404

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

382

405

data buffer */

383

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

406

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

384

407

if(rc != GPG_ERR_NO_ERROR){

385

408

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

386

409

gpgme_strsource(rc), gpgme_strerror(rc));

387

410

plaintext_length = -1;

388

411

if(debug){

389

412

gpgme_decrypt_result_t result;

390

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

391

414

if(result == NULL){

392

415

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

393

416

} else {

470

493

return plaintext_length;

471

494

}

472

495

473

static const char * safer_gnutls_strerror(int value){

474

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

475

-Wunreachable-code */

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

476

499

if(ret == NULL)

477

500

ret = "(unknown)";

478

501

return ret;

479

502

}

480

503

481

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

482

506

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

483

507

const char* string){

484

508

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

485

509

}

486

510

511

__attribute__((nonnull, warn_unused_result))

487

512

static int init_gnutls_global(const char *pubkeyfilename,

488

const char *seckeyfilename){

513

const char *seckeyfilename,

514

mandos_context *mc){

489

515

int ret;

490

516

491

517

if(debug){

508

534

}

509

535

510

536

/* OpenPGP credentials */

511

ret = gnutls_certificate_allocate_credentials(&mc.cred);

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

512

538

if(ret != GNUTLS_E_SUCCESS){

513

539

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

514

540

safer_gnutls_strerror(ret));

524

550

}

525

551

526

552

ret = gnutls_certificate_set_openpgp_key_file

527

(mc.cred, pubkeyfilename, seckeyfilename,

553

(mc->cred, pubkeyfilename, seckeyfilename,

528

554

GNUTLS_OPENPGP_FMT_BASE64);

529

555

if(ret != GNUTLS_E_SUCCESS){

530

556

fprintf_plus(stderr,

536

562

}

537

563

538

564

/* GnuTLS server initialization */

539

ret = gnutls_dh_params_init(&mc.dh_params);

565

ret = gnutls_dh_params_init(&mc->dh_params);

540

566

if(ret != GNUTLS_E_SUCCESS){

541

567

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

542

568

" initialization: %s\n",

543

569

safer_gnutls_strerror(ret));

544

570

goto globalfail;

545

571

}

546

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

572

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

547

573

if(ret != GNUTLS_E_SUCCESS){

548

574

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

549

575

safer_gnutls_strerror(ret));

550

576

goto globalfail;

551

577

}

552

578

553

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

579

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

554

580

555

581

return 0;

556

582

557

583

globalfail:

558

584

559

gnutls_certificate_free_credentials(mc.cred);

585

gnutls_certificate_free_credentials(mc->cred);

560

586

gnutls_global_deinit();

561

gnutls_dh_params_deinit(mc.dh_params);

587

gnutls_dh_params_deinit(mc->dh_params);

562

588

return -1;

563

589

}

564

590

565

static int init_gnutls_session(gnutls_session_t *session){

591

__attribute__((nonnull, warn_unused_result))

592

static int init_gnutls_session(gnutls_session_t *session,

593

mandos_context *mc){

566

594

int ret;

567

595

/* GnuTLS session creation */

568

596

do {

580

608

{

581

609

const char *err;

582

610

do {

583

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

611

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

584

612

if(quit_now){

585

613

gnutls_deinit(*session);

586

614

return -1;

597

625

598

626

do {

599

627

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

600

mc.cred);

628

mc->cred);

601

629

if(quit_now){

602

630

gnutls_deinit(*session);

603

631

return -1;

613

641

/* ignore client certificate if any. */

614

642

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

615

643

616

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

617

645

618

646

return 0;

619

647

}

623

651

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

624

652

625

653

/* Called when a Mandos server is found */

626

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

654

__attribute__((nonnull, warn_unused_result))

655

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

627

656

AvahiIfIndex if_index,

628

int af){

657

int af, mandos_context *mc){

629

658

int ret, tcp_sd = -1;

630

659

ssize_t sret;

631

union {

632

struct sockaddr_in in;

633

struct sockaddr_in6 in6;

634

} to;

660

struct sockaddr_storage to;

635

661

char *buffer = NULL;

636

662

char *decrypted_buffer = NULL;

637

663

size_t buffer_length = 0;

661

687

return -1;

662

688

}

663

689

664

ret = init_gnutls_session(&session);

690

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

691

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

692

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

693

bool match = false;

694

{

695

char *interface = NULL;

696

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

697

interface))){

698

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

699

match = true;

700

break;

701

}

702

}

703

}

704

if(not match){

705

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

706

connect to the server */

707

if(debug){

708

char interface[IF_NAMESIZE];

709

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

710

perror_plus("if_indextoname");

711

} else {

712

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

713

" \"%s\"\n",

714

if_indextoname((unsigned int)if_index,

715

interface));

716

}

717

}

718

return -1;

719

}

720

}

721

722

ret = init_gnutls_session(&session, mc);

665

723

if(ret != 0){

666

724

return -1;

667

725

}

668

726

669

727

if(debug){

670

728

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

671

PRIu16 "\n", ip, port);

729

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

672

730

}

673

731

674

732

tcp_sd = socket(pf, SOCK_STREAM, 0);

686

744

687

745

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

688

746

if(af == AF_INET6){

689

to.in6.sin6_family = (sa_family_t)af;

690

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

747

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

748

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

691

749

} else { /* IPv4 */

692

to.in.sin_family = (sa_family_t)af;

693

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

750

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

751

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

694

752

}

695

753

if(ret < 0 ){

696

754

int e = errno;

705

763

goto mandos_end;

706

764

}

707

765

if(af == AF_INET6){

708

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

709

-Wconversion and

710

-Wunreachable-code */

711

712

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

713

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

714

-Wunreachable-code*/

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

715

769

if(if_index == AVAHI_IF_UNSPEC){

716

770

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

717

771

" incomplete without a network interface\n");

719

773

goto mandos_end;

720

774

}

721

775

/* Set the network interface number as scope */

722

to.in6.sin6_scope_id = (uint32_t)if_index;

776

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

723

777

}

724

778

} else {

725

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

726

-Wconversion and

727

-Wunreachable-code */

779

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

728

780

}

729

781

730

782

if(quit_now){

738

790

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

739

791

perror_plus("if_indextoname");

740

792

} else {

741

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

742

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

793

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

794

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

743

795

}

744

796

} else {

745

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

746

ip, port);

797

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

798

ip, (uintmax_t)port);

747

799

}

748

800

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

749

801

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

const char *pcret;

751

802

if(af == AF_INET6){

752

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

753

sizeof(addrstr));

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

754

807

} else {

755

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

756

sizeof(addrstr));

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

757

812

}

758

if(pcret == NULL){

759

perror_plus("inet_ntop");

760

} else {

761

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

762

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

763

}

813

if(ret == EAI_SYSTEM){

814

perror_plus("getnameinfo");

815

} else if(ret != 0) {

816

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

817

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

818

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

764

819

}

765

820

}

766

821

770

825

}

771

826

772

827

if(af == AF_INET6){

773

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

828

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

829

sizeof(struct sockaddr_in6));

774

830

} else {

775

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

831

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

832

sizeof(struct sockaddr_in));

776

833

}

777

834

if(ret < 0){

778

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

835

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

779

836

int e = errno;

780

837

perror_plus("connect");

781

838

errno = e;

942

999

if(buffer_length > 0){

943

1000

ssize_t decrypted_buffer_size;

944

1001

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

945

&decrypted_buffer);

1002

&decrypted_buffer, mc);

946

1003

if(decrypted_buffer_size >= 0){

947

1004

948

1005

written = 0;

996

1053

return retval;

997

1054

}

998

1055

1056

__attribute__((nonnull))

999

1057

static void resolve_callback(AvahiSServiceResolver *r,

1000

1058

AvahiIfIndex interface,

1001

1059

AvahiProtocol proto,

1009

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

1010

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1011

1069

flags,

1012

AVAHI_GCC_UNUSED void* userdata){

1013

assert(r);

1070

void *mc){

1071

if(r == NULL){

1072

return;

1073

}

1014

1074

1015

1075

/* Called whenever a service has been resolved successfully or

1016

1076

timed out */

1025

1085

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

1026

1086

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

1027

1087

domain,

1028

avahi_strerror(avahi_server_errno(mc.server)));

1088

avahi_strerror(avahi_server_errno

1089

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

1029

1090

break;

1030

1091

1031

1092

case AVAHI_RESOLVER_FOUND:

1037

1098

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

1038

1099

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

1039

1100

}

1040

int ret = start_mandos_communication(ip, port, interface,

1041

avahi_proto_to_af(proto));

1101

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

1102

interface,

1103

avahi_proto_to_af(proto),

1104

mc);

1042

1105

if(ret == 0){

1043

avahi_simple_poll_quit(mc.simple_poll);

1106

avahi_simple_poll_quit(simple_poll);

1044

1107

} else {

1045

if(not add_server(ip, port, interface,

1046

avahi_proto_to_af(proto))){

1108

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

1109

avahi_proto_to_af(proto),

1110

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

1047

1111

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

1048

1112

" list\n", name);

1049

1113

}

1062

1126

const char *domain,

1063

1127

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1064

1128

flags,

1065

AVAHI_GCC_UNUSED void* userdata){

1066

assert(b);

1129

void *mc){

1130

if(b == NULL){

1131

return;

1132

}

1067

1133

1068

1134

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

1069

1135

is removed from the LAN */

1077

1143

case AVAHI_BROWSER_FAILURE:

1078

1144

1079

1145

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1146

avahi_strerror(avahi_server_errno

1147

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

1148

avahi_simple_poll_quit(simple_poll);

1082

1149

return;

1083

1150

1084

1151

case AVAHI_BROWSER_NEW:

1087

1154

the callback function is called the Avahi server will free the

1088

1155

resolver for us. */

1089

1156

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1157

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

1158

interface, protocol, name, type,

1159

domain, protocol, 0,

1160

resolve_callback, mc) == NULL)

1093

1161

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

1094

1162

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1163

avahi_strerror(avahi_server_errno

1164

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

1096

1165

break;

1097

1166

1098

1167

case AVAHI_BROWSER_REMOVE:

1117

1186

signal_received = sig;

1118

1187

int old_errno = errno;

1119

1188

/* set main loop to exit */

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1189

if(simple_poll != NULL){

1190

avahi_simple_poll_quit(simple_poll);

1122

1191

}

1123

1192

errno = old_errno;

1124

1193

}

1125

1194

1195

__attribute__((nonnull, warn_unused_result))

1126

1196

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

1127

1197

int ret;

1128

1198

error_t ret_errno;

1147

1217

return true;

1148

1218

}

1149

1219

1220

__attribute__((nonnull, warn_unused_result))

1150

1221

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

1151

1222

1152

1223

/* Reject the loopback device */

1194

1265

* corresponds to an acceptable network device.

1195

1266

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

1196

1267

*/

1268

__attribute__((nonnull, warn_unused_result))

1197

1269

int good_interface(const struct dirent *if_entry){

1198

1270

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

1199

1271

return 0;

1217

1289

/*

1218

1290

* This function determines if a network interface is up.

1219

1291

*/

1292

__attribute__((nonnull, warn_unused_result))

1220

1293

bool interface_is_up(const char *interface){

1221

1294

struct ifreq ifr;

1222

1295

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

1233

1306

/*

1234

1307

* This function determines if a network interface is running

1235

1308

*/

1309

__attribute__((nonnull, warn_unused_result))

1236

1310

bool interface_is_running(const char *interface){

1237

1311

struct ifreq ifr;

1238

1312

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

1246

1320

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

1247

1321

}

1248

1322

1323

__attribute__((nonnull, pure, warn_unused_result))

1249

1324

int notdotentries(const struct dirent *direntry){

1250

1325

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

1251

1326

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

1258

1333

}

1259

1334

1260

1335

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

1336

__attribute__((nonnull, warn_unused_result))

1261

1337

int runnable_hook(const struct dirent *direntry){

1262

1338

int ret;

1263

1339

size_t sret;

1271

1347

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

1272

1348

"abcdefghijklmnopqrstuvwxyz"

1273

1349

"0123456789"

1274

"_-");

1350

"_.-");

1275

1351

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

1276

1352

/* Contains non-allowed characters */

1277

1353

if(debug){

1281

1357

return 0;

1282

1358

}

1283

1359

1284

char *fullname = NULL;

1285

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1360

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1292

1361

if(ret == -1){

1293

1362

if(debug){

1294

1363

perror_plus("Could not stat hook");

1318

1387

return 1;

1319

1388

}

1320

1389

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1390

__attribute__((nonnull, warn_unused_result))

1391

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1392

mandos_context *mc){

1322

1393

int ret;

1323

1394

struct timespec now;

1324

1395

struct timespec waited_time;

1325

1396

intmax_t block_time;

1326

1397

1327

1398

while(true){

1328

if(mc.current_server == NULL){

1329

if (debug){

1399

if(mc->current_server == NULL){

1400

if(debug){

1330

1401

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

1331

1402

" No timeout!\n");

1332

1403

}

1333

1404

ret = avahi_simple_poll_iterate(s, -1);

1334

1405

} else {

1335

if (debug){

1406

if(debug){

1336

1407

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

1337

1408

" it, or wait\n");

1338

1409

}

1345

1416

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

1346

1417

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

1347

1418

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1419

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

1349

1420

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1421

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

1351

1422

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

1352

1423

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

1353

1424

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

1355

1426

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

1356

1427

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

1357

1428

1358

if (debug){

1429

if(debug){

1359

1430

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

1360

1431

block_time);

1361

1432

}

1362

1433

1363

1434

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);

1435

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

1436

mc->current_server->port,

1437

mc->current_server->if_index,

1438

mc->current_server->af, mc);

1368

1439

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1440

avahi_simple_poll_quit(s);

1370

1441

return 0;

1371

1442

}

1372

1443

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1444

&mc->current_server->last_seen);

1374

1445

if(ret == -1){

1375

1446

perror_plus("clock_gettime");

1376

1447

return -1;

1377

1448

}

1378

mc.current_server = mc.current_server->next;

1449

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

1379

1450

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

1380

1451

servers, but don't block */

1381

1452

}

1383

1454

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

1384

1455

}

1385

1456

if(ret != 0){

1386

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

1457

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

1387

1458

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

1388

1459

}

1389

1460

}

1391

1462

}

1392

1463

1393

1464

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

1465

__attribute__((warn_unused_result))

1394

1466

error_t raise_privileges(void){

1395

1467

error_t old_errno = errno;

1396

1468

error_t ret_errno = 0;

1397

1469

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

1398

1470

ret_errno = errno;

1399

perror_plus("seteuid");

1400

1471

}

1401

1472

errno = old_errno;

1402

1473

return ret_errno;

1403

1474

}

1404

1475

1405

1476

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

1477

__attribute__((warn_unused_result))

1406

1478

error_t raise_privileges_permanently(void){

1407

1479

error_t old_errno = errno;

1408

1480

error_t ret_errno = raise_privileges();

1412

1484

}

1413

1485

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

1414

1486

ret_errno = errno;

1415

perror_plus("seteuid");

1416

1487

}

1417

1488

errno = old_errno;

1418

1489

return ret_errno;

1419

1490

}

1420

1491

1421

1492

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

1493

__attribute__((warn_unused_result))

1422

1494

error_t lower_privileges(void){

1423

1495

error_t old_errno = errno;

1424

1496

error_t ret_errno = 0;

1425

1497

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

1426

1498

ret_errno = errno;

1427

perror_plus("seteuid");

1428

1499

}

1429

1500

errno = old_errno;

1430

1501

return ret_errno;

1431

1502

}

1432

1503

1433

1504

/* Lower privileges permanently */

1505

__attribute__((warn_unused_result))

1434

1506

error_t lower_privileges_permanently(void){

1435

1507

error_t old_errno = errno;

1436

1508

error_t ret_errno = 0;

1437

1509

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

1438

1510

ret_errno = errno;

1439

perror_plus("setuid");

1440

1511

}

1441

1512

errno = old_errno;

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

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

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

1451

alphasort);

1519

struct dirent **direntries = NULL;

1520

if(hookdir_fd == -1){

1521

hookdir_fd = open(hookdir, O_RDONLY);

1522

if(hookdir_fd == -1){

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("open");

1530

}

1531

return;

1532

}

1533

}

1534

#ifdef __GLIBC__

1535

#if __GLIBC_PREREQ(2, 15)

1536

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1537

runnable_hook, alphasort);

1538

#else /* not __GLIBC_PREREQ(2, 15) */

1539

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

1540

alphasort);

1541

#endif /* not __GLIBC_PREREQ(2, 15) */

1542

#else /* not __GLIBC__ */

1543

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

1544

alphasort);

1545

#endif /* not __GLIBC__ */

1452

1546

if(numhooks == -1){

1453

1547

perror_plus("scandir");

1454

} else {

1455

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

1456

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

1457

direntry = direntries[i];

1458

char *fullname = NULL;

1459

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1460

if(ret < 0){

1548

return;

1549

}

1550

struct dirent *direntry;

1551

int ret;

1552

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

1553

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

1554

direntry = direntries[i];

1555

if(debug){

1556

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1557

direntry->d_name);

1558

}

1559

pid_t hook_pid = fork();

1560

if(hook_pid == 0){

1561

/* Child */

1562

/* Raise privileges */

1563

errno = raise_privileges_permanently();

1564

if(errno != 0){

1565

perror_plus("Failed to raise privileges");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Set group */

1569

errno = 0;

1570

ret = setgid(0);

1571

if(ret == -1){

1572

perror_plus("setgid");

1573

_exit(EX_NOPERM);

1574

}

1575

/* Reset supplementary groups */

1576

errno = 0;

1577

ret = setgroups(0, NULL);

1578

if(ret == -1){

1579

perror_plus("setgroups");

1580

_exit(EX_NOPERM);

1581

}

1582

ret = dup2(devnull, STDIN_FILENO);

1583

if(ret == -1){

1584

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

1585

_exit(EX_OSERR);

1586

}

1587

ret = close(devnull);

1588

if(ret == -1){

1589

perror_plus("close");

1590

_exit(EX_OSERR);

1591

}

1592

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1593

if(ret == -1){

1594

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

1595

_exit(EX_OSERR);

1596

}

1597

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

1598

if(ret == -1){

1599

perror_plus("setenv");

1600

_exit(EX_OSERR);

1601

}

1602

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

1603

if(ret == -1){

1604

perror_plus("setenv");

1605

_exit(EX_OSERR);

1606

}

1607

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

1608

if(ret == -1){

1609

perror_plus("setenv");

1610

_exit(EX_OSERR);

1611

}

1612

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

1613

if(ret == -1){

1614

perror_plus("setenv");

1615

_exit(EX_OSERR);

1616

}

1617

char *delaystring;

1618

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

1619

if(ret == -1){

1461

1620

perror_plus("asprintf");

1462

continue;

1463

}

1464

if(debug){

1465

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1466

direntry->d_name);

1467

}

1468

pid_t hook_pid = fork();

1469

if(hook_pid == 0){

1470

/* Child */

1471

/* Raise privileges */

1472

raise_privileges_permanently();

1473

/* Set group */

1474

errno = 0;

1475

ret = setgid(0);

1476

if(ret == -1){

1477

perror_plus("setgid");

1478

}

1479

/* Reset supplementary groups */

1480

errno = 0;

1481

ret = setgroups(0, NULL);

1482

if(ret == -1){

1483

perror_plus("setgroups");

1484

}

1485

dup2(devnull, STDIN_FILENO);

1486

close(devnull);

1487

dup2(STDERR_FILENO, STDOUT_FILENO);

1488

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

1489

if(ret == -1){

1490

perror_plus("setenv");

1491

_exit(EX_OSERR);

1492

}

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

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

1499

if(ret == -1){

1500

perror_plus("setenv");

1501

_exit(EX_OSERR);

1502

}

1503

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

1504

if(ret == -1){

1505

perror_plus("setenv");

1506

_exit(EX_OSERR);

1507

}

1508

char *delaystring;

1509

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

1510

if(ret == -1){

1511

perror_plus("asprintf");

1512

_exit(EX_OSERR);

1513

}

1514

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

1515

if(ret == -1){

1516

free(delaystring);

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1621

_exit(EX_OSERR);

1622

}

1623

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

1624

if(ret == -1){

1520

1625

free(delaystring);

1521

if(connect_to != NULL){

1522

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

1523

if(ret == -1){

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

1527

}

1528

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

1529

perror_plus("execl");

1530

_exit(EXIT_FAILURE);

1531

}

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

free(delaystring);

1630

if(connect_to != NULL){

1631

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

1632

if(ret == -1){

1633

perror_plus("setenv");

1634

_exit(EX_OSERR);

1635

}

1636

}

1637

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1638

if(hook_fd == -1){

1639

perror_plus("openat");

1640

_exit(EXIT_FAILURE);

1641

}

1642

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1643

perror_plus("close");

1644

_exit(EXIT_FAILURE);

1645

}

1646

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

1647

environ) == -1){

1648

perror_plus("fexecve");

1649

_exit(EXIT_FAILURE);

1650

}

1651

} else {

1652

int status;

1653

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

1654

perror_plus("waitpid");

1655

continue;

1656

}

1657

if(WIFEXITED(status)){

1658

if(WEXITSTATUS(status) != 0){

1659

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1660

" with status %d\n", direntry->d_name,

1661

WEXITSTATUS(status));

1662

continue;

1663

}

1664

} else if(WIFSIGNALED(status)){

1665

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1666

" signal %d\n", direntry->d_name,

1667

WTERMSIG(status));

1668

continue;

1532

1669

} else {

1533

int status;

1534

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

1535

perror_plus("waitpid");

1536

free(fullname);

1537

continue;

1538

}

1539

if(WIFEXITED(status)){

1540

if(WEXITSTATUS(status) != 0){

1541

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1542

" with status %d\n", direntry->d_name,

1543

WEXITSTATUS(status));

1544

free(fullname);

1545

continue;

1546

}

1547

} else if(WIFSIGNALED(status)){

1548

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1549

" signal %d\n", direntry->d_name,

1550

WTERMSIG(status));

1551

free(fullname);

1552

continue;

1553

} else {

1554

fprintf_plus(stderr, "Warning: network hook \"%s\""

1555

" crashed\n", direntry->d_name);

1556

free(fullname);

1557

continue;

1558

}

1559

}

1560

free(fullname);

1561

if(debug){

1562

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

1563

direntry->d_name);

1564

}

1565

}

1566

close(devnull);

1567

}

1568

return true;

1670

fprintf_plus(stderr, "Warning: network hook \"%s\""

1671

" crashed\n", direntry->d_name);

1672

continue;

1673

}

1674

}

1675

if(debug){

1676

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

1677

direntry->d_name);

1678

}

1679

}

1680

free(direntries);

1681

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1682

perror_plus("close");

1683

} else {

1684

hookdir_fd = -1;

1685

}

1686

close(devnull);

1569

1687

}

1570

1688

1689

__attribute__((nonnull, warn_unused_result))

1571

1690

error_t bring_up_interface(const char *const interface,

1572

1691

const float delay){

1573

int sd = -1;

1574

1692

error_t old_errno = errno;

1575

error_t ret_errno = 0;

1576

int ret, ret_setflags;

1693

int ret;

1577

1694

struct ifreq network;

1578

1695

unsigned int if_index = if_nametoindex(interface);

1579

1696

if(if_index == 0){

1588

1705

}

1589

1706

1590

1707

if(not interface_is_up(interface)){

1591

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

1708

error_t ret_errno = 0, ioctl_errno = 0;

1709

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

1592

1710

ret_errno = errno;

1593

1711

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

1594

1712

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

1713

errno = old_errno;

1595

1714

return ret_errno;

1596

1715

}

1597

network.ifr_flags |= IFF_UP;

1716

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

1598

1717

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

1718

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

1719

if(sd == -1){

1601

1720

ret_errno = errno;

1602

1721

perror_plus("socket");

1603

1722

errno = old_errno;

1604

1723

return ret_errno;

1605

1724

}

1606

1725

1607

1726

if(quit_now){

1608

close(sd);

1727

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

1728

if(ret == -1){

1729

perror_plus("close");

1730

}

1609

1731

errno = old_errno;

1610

1732

return EINTR;

1611

1733

}

1615

1737

interface);

1616

1738

}

1617

1739

1618

/* Raise priviliges */

1619

raise_privileges();

1740

/* Raise privileges */

1741

ret_errno = raise_privileges();

1742

if(ret_errno != 0){

1743

errno = ret_errno;

1744

perror_plus("Failed to raise privileges");

1745

}

1620

1746

1621

1747

#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");

1748

int ret_linux;

1749

bool restore_loglevel = false;

1750

if(ret_errno == 0){

1751

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1752

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

1753

ret_linux = klogctl(8, NULL, 5);

1754

if(ret_linux == -1){

1755

perror_plus("klogctl");

1756

} else {

1757

restore_loglevel = true;

1758

}

1629

1759

}

1630

1760

#endif /* __linux__ */

1631

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

1632

ret_errno = errno;

1761

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

1762

ioctl_errno = errno;

1633

1763

#ifdef __linux__

1634

1764

if(restore_loglevel){

1635

1765

ret_linux = klogctl(7, NULL, 0);

1639

1769

}

1640

1770

#endif /* __linux__ */

1641

1771

1642

/* Lower privileges */

1643

lower_privileges();

1772

/* If raise_privileges() succeeded above */

1773

if(ret_errno == 0){

1774

/* Lower privileges */

1775

ret_errno = lower_privileges();

1776

if(ret_errno != 0){

1777

errno = ret_errno;

1778

perror_plus("Failed to lower privileges");

1779

}

1780

}

1644

1781

1645

1782

/* Close the socket */

1646

1783

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

1649

1786

}

1650

1787

1651

1788

if(ret_setflags == -1){

1652

errno = ret_errno;

1789

errno = ioctl_errno;

1653

1790

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1654

1791

errno = old_errno;

1655

return ret_errno;

1792

return ioctl_errno;

1656

1793

}

1657

1794

} else if(debug){

1658

1795

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

1676

1813

return 0;

1677

1814

}

1678

1815

1816

__attribute__((nonnull, warn_unused_result))

1679

1817

error_t take_down_interface(const char *const interface){

1680

int sd = -1;

1681

1818

error_t old_errno = errno;

1682

error_t ret_errno = 0;

1683

int ret, ret_setflags;

1684

1819

struct ifreq network;

1685

1820

unsigned int if_index = if_nametoindex(interface);

1686

1821

if(if_index == 0){

1689

1824

return ENXIO;

1690

1825

}

1691

1826

if(interface_is_up(interface)){

1827

error_t ret_errno = 0, ioctl_errno = 0;

1692

1828

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

1693

1829

ret_errno = errno;

1694

1830

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

1695

1831

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

1832

errno = old_errno;

1696

1833

return ret_errno;

1697

1834

}

1698

1835

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

1699

1836

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

1837

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

1838

if(sd == -1){

1702

1839

ret_errno = errno;

1703

1840

perror_plus("socket");

1704

1841

errno = old_errno;

1710

1847

interface);

1711

1848

}

1712

1849

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();

1850

/* Raise privileges */

1851

ret_errno = raise_privileges();

1852

if(ret_errno != 0){

1853

errno = ret_errno;

1854

perror_plus("Failed to raise privileges");

1855

}

1856

1857

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

1858

ioctl_errno = errno;

1859

1860

/* If raise_privileges() succeeded above */

1861

if(ret_errno == 0){

1862

/* Lower privileges */

1863

ret_errno = lower_privileges();

1864

if(ret_errno != 0){

1865

errno = ret_errno;

1866

perror_plus("Failed to lower privileges");

1867

}

1868

}

1721

1869

1722

1870

/* Close the socket */

1723

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

1871

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

1724

1872

if(ret == -1){

1725

1873

perror_plus("close");

1726

1874

}

1727

1875

1728

1876

if(ret_setflags == -1){

1729

errno = ret_errno;

1877

errno = ioctl_errno;

1730

1878

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1731

1879

errno = old_errno;

1732

return ret_errno;

1880

return ioctl_errno;

1733

1881

}

1734

1882

} else if(debug){

1735

1883

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

1741

1889

}

1742

1890

1743

1891

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

1892

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

1893

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

1894

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

1895

.interfaces = NULL, .interfaces_size = 0 };

1744

1896

AvahiSServiceBrowser *sb = NULL;

1745

1897

error_t ret_errno;

1746

1898

int ret;

1747

1899

intmax_t tmpmax;

1748

1900

char *tmp;

1749

1901

int exitcode = EXIT_SUCCESS;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

1752

1902

char *interfaces_to_take_down = NULL;

1753

1903

size_t interfaces_to_take_down_size = 0;

1754

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

1755

bool tempdir_created = false;

1904

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

1905

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

1906

char *tempdir = NULL;

1756

1907

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1757

1908

const char *seckey = PATHDIR "/" SECKEY;

1758

1909

const char *pubkey = PATHDIR "/" PUBKEY;

1759

1910

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

1761

1911

1762

1912

bool gnutls_initialized = false;

1763

1913

bool gpgme_initialized = false;

1854

2004

connect_to = arg;

1855

2005

break;

1856

2006

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

1857

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

1858

(int)',');

2007

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

2008

arg, (int)',');

1859

2009

if(ret_errno != 0){

1860

2010

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

1861

2011

}

1941

2091

/* Work around Debian bug #633582:

1942

2092

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

1943

2093

1944

/* Re-raise priviliges */

1945

if(raise_privileges() == 0){

2094

/* Re-raise privileges */

2095

ret_errno = raise_privileges();

2096

if(ret_errno != 0){

2097

errno = ret_errno;

2098

perror_plus("Failed to raise privileges");

2099

} else {

1946

2100

struct stat st;

1947

2101

1948

2102

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

1988

2142

}

1989

2143

1990

2144

/* Lower privileges */

1991

errno = 0;

1992

ret = seteuid(uid);

1993

if(ret == -1){

1994

perror_plus("seteuid");

2145

ret_errno = lower_privileges();

2146

if(ret_errno != 0){

2147

errno = ret_errno;

2148

perror_plus("Failed to lower privileges");

1995

2149

}

1996

2150

}

1997

2151

}

1998

2152

1999

/* Remove empty interface names */

2153

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

2000

2154

{

2001

2155

char *interface = NULL;

2002

while((interface = argz_next(interfaces, interfaces_size,

2156

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

2003

2157

interface))){

2004

if(if_nametoindex(interface) == 0){

2005

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

2158

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

2159

and if_nametoindex(interface) == 0){

2160

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

2006

2161

fprintf_plus(stderr, "Not using nonexisting interface"

2007

2162

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

2008

2163

}

2009

argz_delete(&interfaces, &interfaces_size, interface);

2164

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

2010

2165

interface = NULL;

2011

2166

}

2012

2167

}

2014

2169

2015

2170

/* Run network hooks */

2016

2171

{

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

}

2172

if(mc.interfaces != NULL){

2173

interfaces_hooks = malloc(mc.interfaces_size);

2174

if(interfaces_hooks == NULL){

2175

perror_plus("malloc");

2176

goto end;

2177

}

2178

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

2179

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

2180

}

2181

run_network_hooks("start", interfaces_hooks != NULL ?

2182

interfaces_hooks : "", delay);

2028

2183

}

2029

2184

2030

2185

if(not debug){

2035

2190

from the signal handler */

2036

2191

/* Initialize the pseudo-RNG for Avahi */

2037

2192

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

2038

mc.simple_poll = avahi_simple_poll_new();

2039

if(mc.simple_poll == NULL){

2193

simple_poll = avahi_simple_poll_new();

2194

if(simple_poll == NULL){

2040

2195

fprintf_plus(stderr,

2041

2196

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

2042

2197

exitcode = EX_UNAVAILABLE;

2107

2262

}

2108

2263

2109

2264

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

2110

if(interfaces == NULL){

2111

struct dirent **direntries;

2265

if(mc.interfaces == NULL){

2266

struct dirent **direntries = NULL;

2112

2267

/* Look for any good interfaces */

2113

2268

ret = scandir(sys_class_net, &direntries, good_interface,

2114

2269

alphasort);

2115

2270

if(ret >= 1){

2116

2271

/* Add all found interfaces to interfaces list */

2117

2272

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

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2273

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

2119

2274

direntries[i]->d_name);

2120

2275

if(ret_errno != 0){

2276

errno = ret_errno;

2121

2277

perror_plus("argz_add");

2122

2278

continue;

2123

2279

}

2128

2284

}

2129

2285

free(direntries);

2130

2286

} else {

2131

free(direntries);

2287

if(ret == 0){

2288

free(direntries);

2289

}

2132

2290

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

2133

2291

exitcode = EXIT_FAILURE;

2134

2292

goto end;

2135

2293

}

2136

2294

}

2137

2295

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)){

2296

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

2297

{

2150

2298

char *interface = NULL;

2151

while((interface = argz_next(interfaces, interfaces_size,

2299

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

2152

2300

interface))){

2301

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

2302

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

2303

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

2304

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

2305

interface);

2306

interface = NULL;

2307

while((interface = argz_next(mc.interfaces,

2308

mc.interfaces_size, interface))){

2309

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

2310

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

2311

interface);

2312

interface = NULL;

2313

}

2314

}

2315

break;

2316

}

2153

2317

bool interface_was_up = interface_is_up(interface);

2154

ret = bring_up_interface(interface, delay);

2318

errno = bring_up_interface(interface, delay);

2155

2319

if(not interface_was_up){

2156

if(ret != 0){

2157

errno = ret;

2320

if(errno != 0){

2158

2321

perror_plus("Failed to bring up interface");

2159

2322

} else {

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2323

errno = argz_add(&interfaces_to_take_down,

2324

&interfaces_to_take_down_size,

2325

interface);

2326

if(errno != 0){

2327

perror_plus("argz_add");

2328

}

2163

2329

}

2164

2330

}

2165

2331

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2169

2332

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

2170

2333

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

2171

2334

}

2172

2335

}

2173

2336

2337

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

2338

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

2339

if(debug){

2340

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

2341

mc.interfaces);

2342

}

2343

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

2344

}

2345

2174

2346

if(quit_now){

2175

2347

goto end;

2176

2348

}

2177

2349

2178

ret = init_gnutls_global(pubkey, seckey);

2350

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

2179

2351

if(ret == -1){

2180

2352

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

2181

2353

exitcode = EX_UNAVAILABLE;

2188

2360

goto end;

2189

2361

}

2190

2362

2191

if(mkdtemp(tempdir) == NULL){

2363

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

2364

tempdir = mkdtemp(run_tempdir);

2365

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

2366

if(debug){

2367

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

2368

run_tempdir, old_tempdir);

2369

}

2370

tempdir = mkdtemp(old_tempdir);

2371

}

2372

if(tempdir == NULL){

2192

2373

perror_plus("mkdtemp");

2193

2374

goto end;

2194

2375

}

2195

tempdir_created = true;

2196

2376

2197

2377

if(quit_now){

2198

2378

goto end;

2199

2379

}

2200

2380

2201

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

2381

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

2202

2382

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

2203

2383

exitcode = EX_UNAVAILABLE;

2204

2384

goto end;

2225

2405

goto end;

2226

2406

}

2227

2407

2228

uint16_t port;

2408

in_port_t port;

2229

2409

errno = 0;

2230

2410

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

2231

2411

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

2232

or tmpmax != (uint16_t)tmpmax){

2412

or tmpmax != (in_port_t)tmpmax){

2233

2413

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

2234

2414

exitcode = EX_USAGE;

2235

2415

goto end;

2236

2416

}

2237

2417

2238

2418

if(quit_now){

2239

2419

goto end;

2240

2420

}

2241

2421

2242

port = (uint16_t)tmpmax;

2422

port = (in_port_t)tmpmax;

2243

2423

*address = '\0';

2244

2424

/* Colon in address indicates IPv6 */

2245

2425

int af;

2261

2441

}

2262

2442

2263

2443

while(not quit_now){

2264

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

2444

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

2445

&mc);

2265

2446

if(quit_now or ret == 0){

2266

2447

break;

2267

2448

}

2269

2450

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

2270

2451

(int)retry_interval);

2271

2452

}

2272

sleep((int)retry_interval);

2453

sleep((unsigned int)retry_interval);

2273

2454

}

2274

2455

2275

if (not quit_now){

2456

if(not quit_now){

2276

2457

exitcode = EXIT_SUCCESS;

2277

2458

}

2278

2459

2293

2474

config.publish_domain = 0;

2294

2475

2295

2476

/* Allocate a new server */

2296

mc.server = avahi_server_new(avahi_simple_poll_get

2297

(mc.simple_poll), &config, NULL,

2298

NULL, &ret_errno);

2477

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2478

&config, NULL, NULL, &ret_errno);

2299

2479

2300

2480

/* Free the Avahi configuration data */

2301

2481

avahi_server_config_free(&config);

2316

2496

/* Create the Avahi service browser */

2317

2497

sb = avahi_s_service_browser_new(mc.server, if_index,

2318

2498

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2319

NULL, 0, browse_callback, NULL);

2499

NULL, 0, browse_callback,

2500

(void *)&mc);

2320

2501

if(sb == NULL){

2321

2502

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

2322

2503

avahi_strerror(avahi_server_errno(mc.server)));

2333

2514

if(debug){

2334

2515

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

2335

2516

}

2336

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

2338

(int)(retry_interval * 1000));

2517

2518

ret = avahi_loop_with_timeout(simple_poll,

2519

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

2339

2520

if(debug){

2340

2521

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

2341

2522

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

2348

2529

}

2349

2530

2350

2531

/* Cleanup things */

2532

free(mc.interfaces);

2533

2351

2534

if(sb != NULL)

2352

2535

avahi_s_service_browser_free(sb);

2353

2536

2354

2537

if(mc.server != NULL)

2355

2538

avahi_server_free(mc.server);

2356

2539

2357

if(mc.simple_poll != NULL)

2358

avahi_simple_poll_free(mc.simple_poll);

2540

if(simple_poll != NULL)

2541

avahi_simple_poll_free(simple_poll);

2359

2542

2360

2543

if(gnutls_initialized){

2361

2544

gnutls_certificate_free_credentials(mc.cred);

2373

2556

mc.current_server->prev->next = NULL;

2374

2557

while(mc.current_server != NULL){

2375

2558

server *next = mc.current_server->next;

2559

#ifdef __GNUC__

2560

#pragma GCC diagnostic push

2561

#pragma GCC diagnostic ignored "-Wcast-qual"

2562

#endif

2563

free((char *)(mc.current_server->ip));

2564

#ifdef __GNUC__

2565

#pragma GCC diagnostic pop

2566

#endif

2376

2567

free(mc.current_server);

2377

2568

mc.current_server = next;

2378

2569

}

2379

2570

}

2380

2571

2381

/* Re-raise priviliges */

2572

/* Re-raise privileges */

2382

2573

{

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();

2574

ret_errno = raise_privileges();

2575

if(ret_errno != 0){

2576

errno = ret_errno;

2577

perror_plus("Failed to raise privileges");

2578

} else {

2579

2580

/* Run network hooks */

2581

run_network_hooks("stop", interfaces_hooks != NULL ?

2582

interfaces_hooks : "", delay);

2583

2584

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

2585

{

2586

char *interface = NULL;

2587

while((interface=argz_next(interfaces_to_take_down,

2588

interfaces_to_take_down_size,

2589

interface))){

2590

ret_errno = take_down_interface(interface);

2591

if(ret_errno != 0){

2592

errno = ret_errno;

2593

perror_plus("Failed to take down interface");

2594

}

2595

}

2596

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

2597

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

2598

" down\n");

2599

}

2600

}

2601

}

2602

2603

ret_errno = lower_privileges_permanently();

2604

if(ret_errno != 0){

2605

errno = ret_errno;

2606

perror_plus("Failed to lower privileges permanently");

2607

}

2407

2608

}

2408

2609

2409

2610

free(interfaces_to_take_down);

2410

2611

free(interfaces_hooks);

2411

2612

2412

2613

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

2413

if(tempdir_created){

2614

if(tempdir != NULL){

2414

2615

struct dirent **direntries = NULL;

2415

struct dirent *direntry = NULL;

2416

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

2417

alphasort);

2418

if (numentries > 0){

2419

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

2420

direntry = direntries[i];

2421

char *fullname = NULL;

2422

ret = asprintf(&fullname, "%s/%s", tempdir,

2423

direntry->d_name);

2424

if(ret < 0){

2425

perror_plus("asprintf");

2426

continue;

2427

}

2428

ret = remove(fullname);

2429

if(ret == -1){

2430

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,

2431

strerror(errno));

2432

}

2433

free(fullname);

2616

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |

2617

O_NOFOLLOW));

2618

if(tempdir_fd == -1){

2619

perror_plus("open");

2620

} else {

2621

#ifdef __GLIBC__

2622

#if __GLIBC_PREREQ(2, 15)

2623

int numentries = scandirat(tempdir_fd, ".", &direntries,

2624

notdotentries, alphasort);

2625

#else /* not __GLIBC_PREREQ(2, 15) */

2626

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

2627

alphasort);

2628

#endif /* not __GLIBC_PREREQ(2, 15) */

2629

#else /* not __GLIBC__ */

2630

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

2631

alphasort);

2632

#endif /* not __GLIBC__ */

2633

if(numentries >= 0){

2634

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

2635

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2636

if(ret == -1){

2637

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2638

" \"%s\", 0): %s\n", tempdir,

2639

direntries[i]->d_name, strerror(errno));

2640

}

2641

}

2642

2643

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

2644

free(direntries);

2645

if(numentries == -1){

2646

perror_plus("scandir");

2647

}

2648

ret = rmdir(tempdir);

2649

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

2650

perror_plus("rmdir");

2651

}

2434

2652

}

2435

}

2436

2437

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

2438

free(direntries);

2439

if (numentries == -1){

2440

perror_plus("scandir");

2441

}

2442

ret = rmdir(tempdir);

2443

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

2444

perror_plus("rmdir");

2653

TEMP_FAILURE_RETRY(close(tempdir_fd));

2445

2654

}

2446

2655

}

2447

2656