/mandos/release : revision 237.16.23

9

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

10

*

11

* Everything else is

12

13

12

13

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*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

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() */

44

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

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stdout, ferror(), remove() */

44

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

45

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

46

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

47

strtof(), abort() */

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(),

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getnameinfo() */

60

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

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inet_pton(), connect() */

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

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60

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

62

61

*/

63

62

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

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63

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(),

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

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

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unlinkat() */

78

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

76

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

77

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

79

78

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

80

79

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

81

80

argp_state, struct argp,

89

88

#include <sys/wait.h> /* waitpid(), WIFEXITED(),

90

89

WEXITSTATUS(), WTERMSIG() */

91

90

#include <grp.h> /* setgroups() */

92

#include <argz.h> /* argz_add_sep(), argz_next(),

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argz_delete(), argz_append(),

94

argz_stringify(), argz_add(),

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

98

91

99

92

#ifdef __linux__

100

93

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

142

135

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

143

136

char *connect_to = NULL;

144

137

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

148

138

149

139

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

150

140

typedef struct server{

151

141

const char *ip;

152

in_port_t port;

142

uint16_t port;

153

143

AvahiIfIndex if_index;

154

144

int af;

155

145

struct timespec last_seen;

159

149

160

150

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

161

151

typedef struct {

152

AvahiSimplePoll *simple_poll;

162

153

AvahiServer *server;

163

154

gnutls_certificate_credentials_t cred;

164

155

unsigned int dh_bits;

166

157

const char *priority;

167

158

gpgme_ctx_t ctx;

168

159

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

160

} mandos_context;

172

161

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

162

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

163

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

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.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

175

167

176

168

sig_atomic_t quit_now = 0;

177

169

int signal_received = 0;

178

170

179

171

/* Function to use when printing errors */

180

172

void perror_plus(const char *print_text){

181

int e = errno;

182

173

fprintf(stderr, "Mandos plugin %s: ",

183

174

program_invocation_short_name);

184

errno = e;

185

175

perror(print_text);

186

176

}

187

177

188

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

189

178

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

190

179

va_list ap;

191

180

va_start (ap, format);

192

181

193

182

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

194

183

program_invocation_short_name));

195

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

184

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

196

185

}

197

186

198

187

/*

200

189

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

201

190

* "buffer_length" is how much is already used.

202

191

*/

203

__attribute__((nonnull, warn_unused_result))

204

192

size_t incbuffer(char **buffer, size_t buffer_length,

205

193

size_t buffer_capacity){

206

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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;

195

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

196

if(buffer == NULL){

213

197

return 0;

214

198

}

215

*buffer = new_buf;

216

199

buffer_capacity += BUFFER_SIZE;

217

200

}

218

201

return buffer_capacity;

219

202

}

220

203

221

204

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

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){

205

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

206

int af){

225

207

int ret;

226

208

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

227

209

if(new_server == NULL){

228

210

perror_plus("malloc");

229

return false;

211

return -1;

230

212

}

231

213

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

232

214

.port = port,

234

216

.af = af };

235

217

if(new_server->ip == NULL){

236

218

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);

252

return false;

219

return -1;

253

220

}

254

221

/* Special case of first server */

255

if(*current_server == NULL){

222

if (mc.current_server == NULL){

256

223

new_server->next = new_server;

257

224

new_server->prev = new_server;

258

*current_server = new_server;

225

mc.current_server = new_server;

226

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

259

227

} else {

260

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

261

new_server->next = *current_server;

262

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

228

new_server->next = mc.current_server;

229

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

263

230

new_server->prev->next = new_server;

264

(*current_server)->prev = new_server;

265

}

266

return true;

231

mc.current_server->prev = new_server;

232

}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return -1;

237

}

238

return 0;

267

239

}

268

240

269

241

/*

270

242

* Initialize GPGME.

271

243

*/

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){

244

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

245

const char *tempdir){

277

246

gpgme_error_t rc;

278

247

gpgme_engine_info_t engine_info;

279

248

249

280

250

/*

281

251

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

282

252

*/

283

bool import_key(const char * const filename){

253

bool import_key(const char *filename){

284

254

int ret;

285

255

int fd;

286

256

gpgme_data_t pgp_data;

298

268

return false;

299

269

}

300

270

301

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

271

rc = gpgme_op_import(mc.ctx, pgp_data);

302

272

if(rc != GPG_ERR_NO_ERROR){

303

273

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

304

274

gpgme_strsource(rc), gpgme_strerror(rc));

348

318

}

349

319

350

320

/* Create new GPGME "context" */

351

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

321

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

352

322

if(rc != GPG_ERR_NO_ERROR){

353

323

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

354

324

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

367

337

* Decrypt OpenPGP data.

368

338

* Returns -1 on error

369

339

*/

370

__attribute__((nonnull, warn_unused_result))

371

340

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

341

size_t crypto_size,

373

char **plaintext,

374

mandos_context *mc){

342

char **plaintext){

375

343

gpgme_data_t dh_crypto, dh_plain;

376

344

gpgme_error_t rc;

377

345

ssize_t ret;

403

371

404

372

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

405

373

data buffer */

406

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

374

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

407

375

if(rc != GPG_ERR_NO_ERROR){

408

376

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

409

377

gpgme_strsource(rc), gpgme_strerror(rc));

410

378

plaintext_length = -1;

411

379

if(debug){

412

380

gpgme_decrypt_result_t result;

413

result = gpgme_op_decrypt_result(mc->ctx);

381

result = gpgme_op_decrypt_result(mc.ctx);

414

382

if(result == NULL){

415

383

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

416

384

} else {

493

461

return plaintext_length;

494

462

}

495

463

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

464

static const char * safer_gnutls_strerror(int value){

465

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

466

-Wunreachable-code */

499

467

if(ret == NULL)

500

468

ret = "(unknown)";

501

469

return ret;

502

470

}

503

471

504

472

/* GnuTLS log function callback */

505

__attribute__((nonnull))

506

473

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

507

474

const char* string){

508

475

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

509

476

}

510

477

511

__attribute__((nonnull, warn_unused_result))

512

478

static int init_gnutls_global(const char *pubkeyfilename,

513

const char *seckeyfilename,

514

mandos_context *mc){

479

const char *seckeyfilename){

515

480

int ret;

516

481

517

482

if(debug){

534

499

}

535

500

536

501

/* OpenPGP credentials */

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

538

503

if(ret != GNUTLS_E_SUCCESS){

539

504

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

540

505

safer_gnutls_strerror(ret));

550

515

}

551

516

552

517

ret = gnutls_certificate_set_openpgp_key_file

553

(mc->cred, pubkeyfilename, seckeyfilename,

518

(mc.cred, pubkeyfilename, seckeyfilename,

554

519

GNUTLS_OPENPGP_FMT_BASE64);

555

520

if(ret != GNUTLS_E_SUCCESS){

556

521

fprintf_plus(stderr,

562

527

}

563

528

564

529

/* GnuTLS server initialization */

565

ret = gnutls_dh_params_init(&mc->dh_params);

530

ret = gnutls_dh_params_init(&mc.dh_params);

566

531

if(ret != GNUTLS_E_SUCCESS){

567

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

568

533

" initialization: %s\n",

569

534

safer_gnutls_strerror(ret));

570

535

goto globalfail;

571

536

}

572

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

537

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

573

538

if(ret != GNUTLS_E_SUCCESS){

574

539

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

575

540

safer_gnutls_strerror(ret));

576

541

goto globalfail;

577

542

}

578

543

579

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

544

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

580

545

581

546

return 0;

582

547

583

548

globalfail:

584

549

585

gnutls_certificate_free_credentials(mc->cred);

550

gnutls_certificate_free_credentials(mc.cred);

586

551

gnutls_global_deinit();

587

gnutls_dh_params_deinit(mc->dh_params);

552

gnutls_dh_params_deinit(mc.dh_params);

588

553

return -1;

589

554

}

590

555

591

__attribute__((nonnull, warn_unused_result))

592

static int init_gnutls_session(gnutls_session_t *session,

593

mandos_context *mc){

556

static int init_gnutls_session(gnutls_session_t *session){

594

557

int ret;

595

558

/* GnuTLS session creation */

596

559

do {

608

571

{

609

572

const char *err;

610

573

do {

611

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

574

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

612

575

if(quit_now){

613

576

gnutls_deinit(*session);

614

577

return -1;

625

588

626

589

do {

627

590

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

628

mc->cred);

591

mc.cred);

629

592

if(quit_now){

630

593

gnutls_deinit(*session);

631

594

return -1;

641

604

/* ignore client certificate if any. */

642

605

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

643

606

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

645

608

646

609

return 0;

647

610

}

651

614

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

652

615

653

616

/* Called when a Mandos server is found */

654

__attribute__((nonnull, warn_unused_result))

655

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

617

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

656

618

AvahiIfIndex if_index,

657

int af, mandos_context *mc){

619

int af){

658

620

int ret, tcp_sd = -1;

659

621

ssize_t sret;

660

struct sockaddr_storage to;

622

union {

623

struct sockaddr_in in;

624

struct sockaddr_in6 in6;

625

} to;

661

626

char *buffer = NULL;

662

627

char *decrypted_buffer = NULL;

663

628

size_t buffer_length = 0;

687

652

return -1;

688

653

}

689

654

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);

655

ret = init_gnutls_session(&session);

723

656

if(ret != 0){

724

657

return -1;

725

658

}

726

659

727

660

if(debug){

728

661

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

729

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

662

PRIu16 "\n", ip, port);

730

663

}

731

664

732

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

744

677

745

678

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

746

679

if(af == AF_INET6){

747

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

748

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

680

to.in6.sin6_family = (sa_family_t)af;

681

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

749

682

} else { /* IPv4 */

750

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

751

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

683

to.in.sin_family = (sa_family_t)af;

684

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

752

685

}

753

686

if(ret < 0 ){

754

687

int e = errno;

763

696

goto mandos_end;

764

697

}

765

698

if(af == AF_INET6){

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

699

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

700

-Wconversion and

701

-Wunreachable-code */

702

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

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

705

-Wunreachable-code*/

769

706

if(if_index == AVAHI_IF_UNSPEC){

770

707

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

771

708

" incomplete without a network interface\n");

773

710

goto mandos_end;

774

711

}

775

712

/* Set the network interface number as scope */

776

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

713

to.in6.sin6_scope_id = (uint32_t)if_index;

777

714

}

778

715

} else {

779

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

716

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

717

-Wconversion and

718

-Wunreachable-code */

780

719

}

781

720

782

721

if(quit_now){

790

729

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

791

730

perror_plus("if_indextoname");

792

731

} else {

793

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

794

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

732

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

733

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

795

734

}

796

735

} else {

797

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

798

ip, (uintmax_t)port);

736

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

737

ip, port);

799

738

}

800

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

801

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

741

const char *pcret;

802

742

if(af == AF_INET6){

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

743

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

744

sizeof(addrstr));

807

745

} else {

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

746

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

747

sizeof(addrstr));

812

748

}

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);

749

if(pcret == NULL){

750

perror_plus("inet_ntop");

751

} else {

752

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

753

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

754

}

819

755

}

820

756

}

821

757

825

761

}

826

762

827

763

if(af == AF_INET6){

828

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

829

sizeof(struct sockaddr_in6));

764

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

830

765

} else {

831

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

832

sizeof(struct sockaddr_in));

766

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

833

767

}

834

768

if(ret < 0){

835

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

769

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

836

770

int e = errno;

837

771

perror_plus("connect");

838

772

errno = e;

884

818

goto mandos_end;

885

819

}

886

820

887

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

888

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

889

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

890

gnutls_transport_set_ptr(session,

891

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

821

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

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

892

823

893

824

if(quit_now){

894

825

errno = EINTR;

999

930

if(buffer_length > 0){

1000

931

ssize_t decrypted_buffer_size;

1001

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1002

&decrypted_buffer, mc);

933

&decrypted_buffer);

1003

934

if(decrypted_buffer_size >= 0){

1004

935

1005

936

written = 0;

1053

984

return retval;

1054

985

}

1055

986

1056

__attribute__((nonnull))

1057

987

static void resolve_callback(AvahiSServiceResolver *r,

1058

988

AvahiIfIndex interface,

1059

989

AvahiProtocol proto,

1067

997

AVAHI_GCC_UNUSED AvahiStringList *txt,

1068

998

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1069

999

flags,

1070

void *mc){

1071

if(r == NULL){

1072

return;

1073

}

1000

AVAHI_GCC_UNUSED void* userdata){

1001

assert(r);

1074

1002

1075

1003

/* Called whenever a service has been resolved successfully or

1076

1004

timed out */

1077

1005

1078

1006

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1080

1007

return;

1081

1008

}

1082

1009

1086

1013

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

1087

1014

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

1088

1015

domain,

1089

avahi_strerror(avahi_server_errno

1090

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

1016

avahi_strerror(avahi_server_errno(mc.server)));

1091

1017

break;

1092

1018

1093

1019

case AVAHI_RESOLVER_FOUND:

1099

1025

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

1100

1026

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

1101

1027

}

1102

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

1103

interface,

1104

avahi_proto_to_af(proto),

1105

mc);

1028

int ret = start_mandos_communication(ip, port, interface,

1029

avahi_proto_to_af(proto));

1106

1030

if(ret == 0){

1107

avahi_simple_poll_quit(simple_poll);

1031

avahi_simple_poll_quit(mc.simple_poll);

1108

1032

} else {

1109

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

1110

avahi_proto_to_af(proto),

1111

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

1112

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

1113

" list\n", name);

1114

}

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

1115

1035

}

1116

1036

}

1117

1037

}

1127

1047

const char *domain,

1128

1048

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1129

1049

flags,

1130

void *mc){

1131

if(b == NULL){

1132

return;

1133

}

1050

AVAHI_GCC_UNUSED void* userdata){

1051

assert(b);

1134

1052

1135

1053

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

1136

1054

is removed from the LAN */

1144

1062

case AVAHI_BROWSER_FAILURE:

1145

1063

1146

1064

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

1147

avahi_strerror(avahi_server_errno

1148

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

1149

avahi_simple_poll_quit(simple_poll);

1065

avahi_strerror(avahi_server_errno(mc.server)));

1066

avahi_simple_poll_quit(mc.simple_poll);

1150

1067

return;

1151

1068

1152

1069

case AVAHI_BROWSER_NEW:

1155

1072

the callback function is called the Avahi server will free the

1156

1073

resolver for us. */

1157

1074

1158

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

1159

interface, protocol, name, type,

1160

domain, protocol, 0,

1161

resolve_callback, mc) == NULL)

1075

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

1076

name, type, domain, protocol, 0,

1077

resolve_callback, NULL) == NULL)

1162

1078

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

1163

1079

" %s\n", name,

1164

avahi_strerror(avahi_server_errno

1165

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1166

1081

break;

1167

1082

1168

1083

case AVAHI_BROWSER_REMOVE:

1187

1102

signal_received = sig;

1188

1103

int old_errno = errno;

1189

1104

/* set main loop to exit */

1190

if(simple_poll != NULL){

1191

avahi_simple_poll_quit(simple_poll);

1105

if(mc.simple_poll != NULL){

1106

avahi_simple_poll_quit(mc.simple_poll);

1192

1107

}

1193

1108

errno = old_errno;

1194

1109

}

1195

1110

1196

__attribute__((nonnull, warn_unused_result))

1197

1111

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

1198

1112

int ret;

1199

error_t ret_errno;

1200

1113

1201

1114

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

1202

1115

if(s < 0){

1203

ret_errno = errno;

1204

1116

perror_plus("socket");

1205

errno = ret_errno;

1206

1117

return false;

1207

1118

}

1208

1119

strcpy(ifr->ifr_name, ifname);

1209

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1210

1121

if(ret == -1){

1211

1122

if(debug){

1212

ret_errno = errno;

1213

1123

perror_plus("ioctl SIOCGIFFLAGS");

1214

errno = ret_errno;

1215

1124

}

1216

1125

return false;

1217

1126

}

1218

1127

return true;

1219

1128

}

1220

1129

1221

__attribute__((nonnull, warn_unused_result))

1222

1130

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

1223

1131

1224

1132

/* Reject the loopback device */

1266

1174

* corresponds to an acceptable network device.

1267

1175

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

1268

1176

*/

1269

__attribute__((nonnull, warn_unused_result))

1270

1177

int good_interface(const struct dirent *if_entry){

1271

1178

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

1272

1179

return 0;

1288

1195

}

1289

1196

1290

1197

/*

1291

* This function determines if a network interface is up.

1292

*/

1293

__attribute__((nonnull, warn_unused_result))

1294

bool interface_is_up(const char *interface){

1295

struct ifreq ifr;

1296

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

1297

if(debug){

1298

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

1299

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

1300

}

1301

return false;

1302

}

1303

1304

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

1305

}

1306

1307

/*

1308

* This function determines if a network interface is running

1309

*/

1310

__attribute__((nonnull, warn_unused_result))

1311

bool interface_is_running(const char *interface){

1312

struct ifreq ifr;

1313

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

1314

if(debug){

1315

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

1316

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

1317

}

1318

return false;

1319

}

1320

1321

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

1322

}

1323

1324

__attribute__((nonnull, pure, warn_unused_result))

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1236

}

1237

return 1;

1238

}

1239

1325

1240

int notdotentries(const struct dirent *direntry){

1326

1241

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

1327

1242

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

1334

1249

}

1335

1250

1336

1251

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

1337

__attribute__((nonnull, warn_unused_result))

1338

1252

int runnable_hook(const struct dirent *direntry){

1339

1253

int ret;

1340

1254

size_t sret;

1348

1262

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

1349

1263

"abcdefghijklmnopqrstuvwxyz"

1350

1264

"0123456789"

1351

"_.-");

1265

"_-");

1352

1266

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

1353

1267

/* Contains non-allowed characters */

1354

1268

if(debug){

1358

1272

return 0;

1359

1273

}

1360

1274

1361

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

1275

char *fullname = NULL;

1276

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

1277

if(ret < 0){

1278

perror_plus("asprintf");

1279

return 0;

1280

}

1281

1282

ret = stat(fullname, &st);

1362

1283

if(ret == -1){

1363

1284

if(debug){

1364

1285

perror_plus("Could not stat hook");

1388

1309

return 1;

1389

1310

}

1390

1311

1391

__attribute__((nonnull, warn_unused_result))

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

mandos_context *mc){

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1394

1313

int ret;

1395

1314

struct timespec now;

1396

1315

struct timespec waited_time;

1397

1316

intmax_t block_time;

1398

1317

1399

1318

while(true){

1400

if(mc->current_server == NULL){

1401

if(debug){

1319

if(mc.current_server == NULL){

1320

if (debug){

1402

1321

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

1403

1322

" No timeout!\n");

1404

1323

}

1405

1324

ret = avahi_simple_poll_iterate(s, -1);

1406

1325

} else {

1407

if(debug){

1326

if (debug){

1408

1327

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

1409

1328

" it, or wait\n");

1410

1329

}

1417

1336

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

1418

1337

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

1419

1338

waited_time.tv_sec = (now.tv_sec

1420

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

1339

- mc.current_server->last_seen.tv_sec);

1421

1340

waited_time.tv_nsec = (now.tv_nsec

1422

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

1341

- mc.current_server->last_seen.tv_nsec);

1423

1342

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

1424

1343

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

1425

1344

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

1427

1346

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

1428

1347

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

1429

1348

1430

if(debug){

1349

if (debug){

1431

1350

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

1432

1351

block_time);

1433

1352

}

1434

1353

1435

1354

if(block_time <= 0){

1436

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

1437

mc->current_server->port,

1438

mc->current_server->if_index,

1439

mc->current_server->af, mc);

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1440

1359

if(ret == 0){

1441

avahi_simple_poll_quit(s);

1360

avahi_simple_poll_quit(mc.simple_poll);

1442

1361

return 0;

1443

1362

}

1444

1363

ret = clock_gettime(CLOCK_MONOTONIC,

1445

&mc->current_server->last_seen);

1364

&mc.current_server->last_seen);

1446

1365

if(ret == -1){

1447

1366

perror_plus("clock_gettime");

1448

1367

return -1;

1449

1368

}

1450

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

1369

mc.current_server = mc.current_server->next;

1451

1370

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

1452

1371

servers, but don't block */

1453

1372

}

1455

1374

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

1456

1375

}

1457

1376

if(ret != 0){

1458

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

1377

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

1459

1378

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

1460

1379

}

1461

1380

}

1462

1381

}

1463

1382

}

1464

1383

1465

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

1466

__attribute__((warn_unused_result))

1467

error_t raise_privileges(void){

1468

error_t old_errno = errno;

1469

error_t ret_errno = 0;

1470

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

1471

ret_errno = errno;

1472

}

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

1477

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

1478

__attribute__((warn_unused_result))

1479

error_t raise_privileges_permanently(void){

1480

error_t old_errno = errno;

1481

error_t ret_errno = raise_privileges();

1482

if(ret_errno != 0){

1483

errno = old_errno;

1484

return ret_errno;

1485

}

1486

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

1487

ret_errno = errno;

1488

}

1489

errno = old_errno;

1490

return ret_errno;

1491

}

1492

1493

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

1494

__attribute__((warn_unused_result))

1495

error_t lower_privileges(void){

1496

error_t old_errno = errno;

1497

error_t ret_errno = 0;

1498

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

1499

ret_errno = errno;

1500

}

1501

errno = old_errno;

1502

return ret_errno;

1503

}

1504

1505

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1507

error_t lower_privileges_permanently(void){

1508

error_t old_errno = errno;

1509

error_t ret_errno = 0;

1510

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

1511

ret_errno = errno;

1512

}

1513

errno = old_errno;

1514

return ret_errno;

1515

}

1516

1517

__attribute__((nonnull))

1518

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

1384

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

1519

1385

const float delay){

1520

struct dirent **direntries = NULL;

1521

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1523

if(hookdir_fd == -1){

1524

if(errno == ENOENT){

1525

if(debug){

1526

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

1527

" found\n", hookdir);

1528

}

1529

} else {

1530

perror_plus("open");

1531

}

1532

return;

1533

}

1534

}

1535

#ifdef __GLIBC__

1536

#if __GLIBC_PREREQ(2, 15)

1537

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

1538

runnable_hook, alphasort);

1539

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

1540

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

1541

alphasort);

1542

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

1543

#else /* not __GLIBC__ */

1544

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

1545

alphasort);

1546

#endif /* not __GLIBC__ */

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1547

1391

if(numhooks == -1){

1548

1392

perror_plus("scandir");

1549

return;

1550

}

1551

struct dirent *direntry;

1552

int ret;

1553

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

1554

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

1555

direntry = direntries[i];

1556

if(debug){

1557

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

1558

direntry->d_name);

1559

}

1560

pid_t hook_pid = fork();

1561

if(hook_pid == 0){

1562

/* Child */

1563

/* Raise privileges */

1564

errno = raise_privileges_permanently();

1565

if(errno != 0){

1566

perror_plus("Failed to raise privileges");

1567

_exit(EX_NOPERM);

1568

}

1569

/* Set group */

1570

errno = 0;

1571

ret = setgid(0);

1572

if(ret == -1){

1573

perror_plus("setgid");

1574

_exit(EX_NOPERM);

1575

}

1576

/* Reset supplementary groups */

1577

errno = 0;

1578

ret = setgroups(0, NULL);

1579

if(ret == -1){

1580

perror_plus("setgroups");

1581

_exit(EX_NOPERM);

1582

}

1583

ret = dup2(devnull, STDIN_FILENO);

1584

if(ret == -1){

1585

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

1586

_exit(EX_OSERR);

1587

}

1588

ret = close(devnull);

1589

if(ret == -1){

1590

perror_plus("close");

1591

_exit(EX_OSERR);

1592

}

1593

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1594

if(ret == -1){

1595

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

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

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

1604

if(ret == -1){

1605

perror_plus("setenv");

1606

_exit(EX_OSERR);

1607

}

1608

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

1609

if(ret == -1){

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1615

perror_plus("setenv");

1616

_exit(EX_OSERR);

1617

}

1618

char *delaystring;

1619

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

1620

if(ret == -1){

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

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

1399

if(ret < 0){

1621

1400

perror_plus("asprintf");

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

1401

continue;

1402

}

1403

if(debug){

1404

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

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

dup2(devnull, STDIN_FILENO);

1435

close(devnull);

1436

dup2(STDERR_FILENO, STDOUT_FILENO);

1437

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

1438

if(ret == -1){

1439

perror_plus("setenv");

1440

_exit(EX_OSERR);

1441

}

1442

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

1443

if(ret == -1){

1444

perror_plus("setenv");

1445

_exit(EX_OSERR);

1446

}

1447

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

1448

if(ret == -1){

1449

perror_plus("setenv");

1450

_exit(EX_OSERR);

1451

}

1452

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

1453

if(ret == -1){

1454

perror_plus("setenv");

1455

_exit(EX_OSERR);

1456

}

1457

char *delaystring;

1458

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

1459

if(ret == -1){

1460

perror_plus("asprintf");

1461

_exit(EX_OSERR);

1462

}

1463

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

1464

if(ret == -1){

1465

free(delaystring);

1466

perror_plus("setenv");

1467

_exit(EX_OSERR);

1468

}

1626

1469

free(delaystring);

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

free(delaystring);

1631

if(connect_to != NULL){

1632

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

1633

if(ret == -1){

1634

perror_plus("setenv");

1635

_exit(EX_OSERR);

1636

}

1637

}

1638

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

1639

if(hook_fd == -1){

1640

perror_plus("openat");

1641

_exit(EXIT_FAILURE);

1642

}

1643

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

1644

perror_plus("close");

1645

_exit(EXIT_FAILURE);

1646

}

1647

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

1648

environ) == -1){

1649

perror_plus("fexecve");

1650

_exit(EXIT_FAILURE);

1651

}

1652

} else {

1653

if(hook_pid == -1){

1654

perror_plus("fork");

1655

free(direntry);

1656

continue;

1657

}

1658

int status;

1659

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

1660

perror_plus("waitpid");

1661

free(direntry);

1662

continue;

1663

}

1664

if(WIFEXITED(status)){

1665

if(WEXITSTATUS(status) != 0){

1666

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

1667

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

1668

WEXITSTATUS(status));

1669

free(direntry);

1670

continue;

1671

}

1672

} else if(WIFSIGNALED(status)){

1673

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

1674

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

1675

WTERMSIG(status));

1676

free(direntry);

1677

continue;

1678

} else {

1679

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

1680

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

1681

free(direntry);

1682

continue;

1683

}

1684

}

1685

if(debug){

1686

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

1687

direntry->d_name);

1688

}

1689

free(direntry);

1690

}

1691

free(direntries);

1692

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

1693

perror_plus("close");

1694

} else {

1695

hookdir_fd = -1;

1696

}

1697

close(devnull);

1698

}

1699

1700

__attribute__((nonnull, warn_unused_result))

1701

error_t bring_up_interface(const char *const interface,

1702

const float delay){

1703

error_t old_errno = errno;

1704

int ret;

1705

struct ifreq network;

1706

unsigned int if_index = if_nametoindex(interface);

1707

if(if_index == 0){

1708

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

1709

errno = old_errno;

1710

return ENXIO;

1711

}

1712

1713

if(quit_now){

1714

errno = old_errno;

1715

return EINTR;

1716

}

1717

1718

if(not interface_is_up(interface)){

1719

error_t ret_errno = 0, ioctl_errno = 0;

1720

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

1721

ret_errno = errno;

1722

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

1723

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

1724

errno = old_errno;

1725

return ret_errno;

1726

}

1727

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

1728

1729

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

1730

if(sd == -1){

1731

ret_errno = errno;

1732

perror_plus("socket");

1733

errno = old_errno;

1734

return ret_errno;

1735

}

1736

1737

if(quit_now){

1738

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

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1742

errno = old_errno;

1743

return EINTR;

1744

}

1745

1746

if(debug){

1747

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

1748

interface);

1749

}

1750

1751

/* Raise privileges */

1752

ret_errno = raise_privileges();

1753

if(ret_errno != 0){

1754

errno = ret_errno;

1755

perror_plus("Failed to raise privileges");

1756

}

1757

1758

#ifdef __linux__

1759

int ret_linux;

1760

bool restore_loglevel = false;

1761

if(ret_errno == 0){

1762

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1763

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

1764

ret_linux = klogctl(8, NULL, 5);

1765

if(ret_linux == -1){

1766

perror_plus("klogctl");

1767

} else {

1768

restore_loglevel = true;

1769

}

1770

}

1771

#endif /* __linux__ */

1772

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

1773

ioctl_errno = errno;

1774

#ifdef __linux__

1775

if(restore_loglevel){

1776

ret_linux = klogctl(7, NULL, 0);

1777

if(ret_linux == -1){

1778

perror_plus("klogctl");

1779

}

1780

}

1781

#endif /* __linux__ */

1782

1783

/* If raise_privileges() succeeded above */

1784

if(ret_errno == 0){

1785

/* Lower privileges */

1786

ret_errno = lower_privileges();

1787

if(ret_errno != 0){

1788

errno = ret_errno;

1789

perror_plus("Failed to lower privileges");

1790

}

1791

}

1792

1793

/* Close the socket */

1794

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

1795

if(ret == -1){

1796

perror_plus("close");

1797

}

1798

1799

if(ret_setflags == -1){

1800

errno = ioctl_errno;

1801

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1802

errno = old_errno;

1803

return ioctl_errno;

1804

}

1805

} else if(debug){

1806

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

1807

interface);

1808

}

1809

1810

/* Sleep checking until interface is running.

1811

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

1812

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

1813

if(interface_is_running(interface)){

1814

break;

1815

}

1816

struct timespec sleeptime = { .tv_nsec = 250000000 };

1817

ret = nanosleep(&sleeptime, NULL);

1818

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

1819

perror_plus("nanosleep");

1820

}

1821

}

1822

1823

errno = old_errno;

1824

return 0;

1825

}

1826

1827

__attribute__((nonnull, warn_unused_result))

1828

error_t take_down_interface(const char *const interface){

1829

error_t old_errno = errno;

1830

struct ifreq network;

1831

unsigned int if_index = if_nametoindex(interface);

1832

if(if_index == 0){

1833

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

1834

errno = old_errno;

1835

return ENXIO;

1836

}

1837

if(interface_is_up(interface)){

1838

error_t ret_errno = 0, ioctl_errno = 0;

1839

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

1840

ret_errno = errno;

1841

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

1842

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

1843

errno = old_errno;

1844

return ret_errno;

1845

}

1846

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

1847

1848

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

1849

if(sd == -1){

1850

ret_errno = errno;

1851

perror_plus("socket");

1852

errno = old_errno;

1853

return ret_errno;

1854

}

1855

1856

if(debug){

1857

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

1858

interface);

1859

}

1860

1861

/* Raise privileges */

1862

ret_errno = raise_privileges();

1863

if(ret_errno != 0){

1864

errno = ret_errno;

1865

perror_plus("Failed to raise privileges");

1866

}

1867

1868

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

1869

ioctl_errno = errno;

1870

1871

/* If raise_privileges() succeeded above */

1872

if(ret_errno == 0){

1873

/* Lower privileges */

1874

ret_errno = lower_privileges();

1875

if(ret_errno != 0){

1876

errno = ret_errno;

1877

perror_plus("Failed to lower privileges");

1878

}

1879

}

1880

1881

/* Close the socket */

1882

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

1883

if(ret == -1){

1884

perror_plus("close");

1885

}

1886

1887

if(ret_setflags == -1){

1888

errno = ioctl_errno;

1889

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1890

errno = old_errno;

1891

return ioctl_errno;

1892

}

1893

} else if(debug){

1894

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

1895

interface);

1896

}

1897

1898

errno = old_errno;

1899

return 0;

1470

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

1471

perror_plus("execl");

1472

} else {

1473

int status;

1474

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

1475

perror_plus("waitpid");

1476

free(fullname);

1477

continue;

1478

}

1479

if(WIFEXITED(status)){

1480

if(WEXITSTATUS(status) != 0){

1481

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

1482

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

1483

WEXITSTATUS(status));

1484

free(fullname);

1485

continue;

1486

}

1487

} else if(WIFSIGNALED(status)){

1488

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

1489

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

1490

WTERMSIG(status));

1491

free(fullname);

1492

continue;

1493

} else {

1494

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

1495

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

1496

free(fullname);

1497

continue;

1498

}

1499

}

1500

free(fullname);

1501

if(debug){

1502

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

1503

direntry->d_name);

1504

}

1505

}

1506

close(devnull);

1507

}

1508

return true;

1900

1509

}

1901

1510

1902

1511

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

1903

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

1904

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

1905

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

1906

.interfaces = NULL, .interfaces_size = 0 };

1907

1512

AvahiSServiceBrowser *sb = NULL;

1908

error_t ret_errno;

1513

int error;

1909

1514

int ret;

1910

1515

intmax_t tmpmax;

1911

1516

char *tmp;

1912

1517

int exitcode = EXIT_SUCCESS;

1913

char *interfaces_to_take_down = NULL;

1914

size_t interfaces_to_take_down_size = 0;

1915

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

1916

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

1917

char *tempdir = NULL;

1518

const char *interface = "";

1519

struct ifreq network;

1520

int sd = -1;

1521

bool take_down_interface = false;

1522

uid_t uid;

1523

gid_t gid;

1524

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

1525

bool tempdir_created = false;

1918

1526

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1919

1527

const char *seckey = PATHDIR "/" SECKEY;

1920

1528

const char *pubkey = PATHDIR "/" PUBKEY;

1921

char *interfaces_hooks = NULL;

1922

1529

1923

1530

bool gnutls_initialized = false;

1924

1531

bool gpgme_initialized = false;

1986

1593

.group = 2 },

1987

1594

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

1988

1595

.arg = "SECONDS",

1989

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

1596

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

1990

1597

.group = 2 },

1991

1598

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

1992

1599

.arg = "DIR",

2015

1622

connect_to = arg;

2016

1623

break;

2017

1624

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

2018

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

2019

arg, (int)',');

2020

if(ret_errno != 0){

2021

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

2022

}

1625

interface = arg;

2023

1626

break;

2024

1627

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

2025

1628

seckey = arg;

2068

1671

argp_state_help(state, state->out_stream,

2069

1672

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2070

1673

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

2071

1676

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

2072

1677

exit(argp_err_exit_status);

2073

1678

break;

2102

1707

/* Work around Debian bug #633582:

2103

1708

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

2104

1709

2105

/* Re-raise privileges */

2106

ret_errno = raise_privileges();

2107

if(ret_errno != 0){

2108

errno = ret_errno;

2109

perror_plus("Failed to raise privileges");

1710

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

2110

1715

} else {

2111

1716

struct stat st;

2112

1717

2153

1758

}

2154

1759

2155

1760

/* Lower privileges */

2156

ret_errno = lower_privileges();

2157

if(ret_errno != 0){

2158

errno = ret_errno;

2159

perror_plus("Failed to lower privileges");

2160

}

2161

}

2162

}

2163

2164

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

2165

{

2166

char *interface = NULL;

2167

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

2168

interface))){

2169

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

2170

and if_nametoindex(interface) == 0){

2171

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

2172

fprintf_plus(stderr, "Not using nonexisting interface"

2173

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

2174

}

2175

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

2176

interface = NULL;

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

2177

1765

}

2178

1766

}

2179

1767

}

2180

1768

2181

1769

/* Run network hooks */

2182

{

2183

if(mc.interfaces != NULL){

2184

interfaces_hooks = malloc(mc.interfaces_size);

2185

if(interfaces_hooks == NULL){

2186

perror_plus("malloc");

2187

goto end;

2188

}

2189

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

2190

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

2191

}

2192

run_network_hooks("start", interfaces_hooks != NULL ?

2193

interfaces_hooks : "", delay);

1770

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

1771

goto end;

2194

1772

}

2195

1773

2196

1774

if(not debug){

2197

1775

avahi_set_log_function(empty_log);

2198

1776

}

2199

1777

1778

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

1779

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

if(ret >= 1){

1790

/* Pick the first interface returned */

1791

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

1792

if(debug){

1793

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

1794

}

1795

if(interface == NULL){

1796

perror_plus("malloc");

1797

free(direntries);

1798

exitcode = EXIT_FAILURE;

1799

goto end;

1800

}

1801

free(direntries);

1802

} else {

1803

free(direntries);

1804

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

1805

exitcode = EXIT_FAILURE;

1806

goto end;

1807

}

1808

}

1809

2200

1810

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

2201

1811

from the signal handler */

2202

1812

/* Initialize the pseudo-RNG for Avahi */

2203

1813

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

2204

simple_poll = avahi_simple_poll_new();

2205

if(simple_poll == NULL){

1814

mc.simple_poll = avahi_simple_poll_new();

1815

if(mc.simple_poll == NULL){

2206

1816

fprintf_plus(stderr,

2207

1817

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

2208

1818

exitcode = EX_UNAVAILABLE;

2272

1882

}

2273

1883

}

2274

1884

2275

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

2276

if(mc.interfaces == NULL){

2277

struct dirent **direntries = NULL;

2278

/* Look for any good interfaces */

2279

ret = scandir(sys_class_net, &direntries, good_interface,

2280

alphasort);

2281

if(ret >= 1){

2282

/* Add all found interfaces to interfaces list */

2283

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

2284

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

2285

direntries[i]->d_name);

2286

if(ret_errno != 0){

2287

errno = ret_errno;

2288

perror_plus("argz_add");

2289

free(direntries[i]);

2290

continue;

2291

}

2292

if(debug){

2293

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

2294

direntries[i]->d_name);

2295

}

2296

free(direntries[i]);

2297

}

2298

free(direntries);

2299

} else {

2300

if(ret == 0){

2301

free(direntries);

2302

}

2303

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

2304

exitcode = EXIT_FAILURE;

2305

goto end;

2306

}

2307

}

2308

2309

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

2310

{

2311

char *interface = NULL;

2312

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

2313

interface))){

2314

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

2315

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

2316

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

2317

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

2318

interface);

2319

interface = NULL;

2320

while((interface = argz_next(mc.interfaces,

2321

mc.interfaces_size, interface))){

2322

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

2323

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

2324

interface);

2325

interface = NULL;

1885

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

1886

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

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1888

if(if_index == 0){

1889

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

1890

exitcode = EX_UNAVAILABLE;

1891

goto end;

1892

}

1893

1894

if(quit_now){

1895

goto end;

1896

}

1897

1898

/* Re-raise priviliges */

1899

errno = 0;

1900

ret = seteuid(0);

1901

if(ret == -1){

1902

perror_plus("seteuid");

1903

}

1904

1905

#ifdef __linux__

1906

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1907

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

1908

ret = klogctl(8, NULL, 5);

1909

bool restore_loglevel = true;

1910

if(ret == -1){

1911

restore_loglevel = false;

1912

perror_plus("klogctl");

1913

}

1914

#endif /* __linux__ */

1915

1916

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1917

if(sd < 0){

1918

perror_plus("socket");

1919

exitcode = EX_OSERR;

1920

#ifdef __linux__

1921

if(restore_loglevel){

1922

ret = klogctl(7, NULL, 0);

1923

if(ret == -1){

1924

perror_plus("klogctl");

1925

}

1926

}

1927

#endif /* __linux__ */

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1934

goto end;

1935

}

1936

strcpy(network.ifr_name, interface);

1937

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

1938

if(ret == -1){

1939

perror_plus("ioctl SIOCGIFFLAGS");

1940

#ifdef __linux__

1941

if(restore_loglevel){

1942

ret = klogctl(7, NULL, 0);

1943

if(ret == -1){

1944

perror_plus("klogctl");

1945

}

1946

}

1947

#endif /* __linux__ */

1948

exitcode = EX_OSERR;

1949

/* Lower privileges */

1950

errno = 0;

1951

ret = seteuid(uid);

1952

if(ret == -1){

1953

perror_plus("seteuid");

1954

}

1955

goto end;

1956

}

1957

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

1958

network.ifr_flags |= IFF_UP;

1959

take_down_interface = true;

1960

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

1961

if(ret == -1){

1962

take_down_interface = false;

1963

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1964

exitcode = EX_OSERR;

1965

#ifdef __linux__

1966

if(restore_loglevel){

1967

ret = klogctl(7, NULL, 0);

1968

if(ret == -1){

1969

perror_plus("klogctl");

2326

1970

}

2327

1971

}

1972

#endif /* __linux__ */

1973

/* Lower privileges */

1974

errno = 0;

1975

ret = seteuid(uid);

1976

if(ret == -1){

1977

perror_plus("seteuid");

1978

}

1979

goto end;

1980

}

1981

}

1982

/* Sleep checking until interface is running.

1983

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

1984

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

1985

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

1986

if(ret == -1){

1987

perror_plus("ioctl SIOCGIFFLAGS");

1988

} else if(network.ifr_flags & IFF_RUNNING){

2328

1989

break;

2329

1990

}

2330

bool interface_was_up = interface_is_up(interface);

2331

errno = bring_up_interface(interface, delay);

2332

if(not interface_was_up){

2333

if(errno != 0){

2334

perror_plus("Failed to bring up interface");

2335

} else {

2336

errno = argz_add(&interfaces_to_take_down,

2337

&interfaces_to_take_down_size,

2338

interface);

2339

if(errno != 0){

2340

perror_plus("argz_add");

2341

}

2342

}

2343

}

2344

}

2345

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

2346

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

2347

}

2348

}

2349

2350

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

2351

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

2352

if(debug){

2353

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

2354

mc.interfaces);

2355

}

2356

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

1991

struct timespec sleeptime = { .tv_nsec = 250000000 };

1992

ret = nanosleep(&sleeptime, NULL);

1993

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

1994

perror_plus("nanosleep");

1995

}

1996

}

1997

if(not take_down_interface){

1998

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

1999

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

2000

if(ret == -1){

2001

perror_plus("close");

2002

}

2003

}

2004

#ifdef __linux__

2005

if(restore_loglevel){

2006

/* Restores kernel loglevel to default */

2007

ret = klogctl(7, NULL, 0);

2008

if(ret == -1){

2009

perror_plus("klogctl");

2010

}

2011

}

2012

#endif /* __linux__ */

2013

/* Lower privileges */

2014

errno = 0;

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

2019

}

2357

2020

}

2358

2021

2359

2022

if(quit_now){

2360

2023

goto end;

2361

2024

}

2362

2025

2363

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

2026

ret = init_gnutls_global(pubkey, seckey);

2364

2027

if(ret == -1){

2365

2028

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

2366

2029

exitcode = EX_UNAVAILABLE;

2373

2036

goto end;

2374

2037

}

2375

2038

2376

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

2377

tempdir = mkdtemp(run_tempdir);

2378

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

2379

if(debug){

2380

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

2381

run_tempdir, old_tempdir);

2382

}

2383

tempdir = mkdtemp(old_tempdir);

2384

}

2385

if(tempdir == NULL){

2039

if(mkdtemp(tempdir) == NULL){

2386

2040

perror_plus("mkdtemp");

2387

2041

goto end;

2388

2042

}

2043

tempdir_created = true;

2389

2044

2390

2045

if(quit_now){

2391

2046

goto end;

2392

2047

}

2393

2048

2394

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

2049

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

2395

2050

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

2396

2051

exitcode = EX_UNAVAILABLE;

2397

2052

goto end;

2407

2062

/* Connect directly, do not use Zeroconf */

2408

2063

/* (Mainly meant for debugging) */

2409

2064

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

2410

2411

2065

if(address == NULL){

2412

2066

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

2413

2067

exitcode = EX_USAGE;

2418

2072

goto end;

2419

2073

}

2420

2074

2421

in_port_t port;

2075

uint16_t port;

2422

2076

errno = 0;

2423

2077

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

2424

2078

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

2425

or tmpmax != (in_port_t)tmpmax){

2079

or tmpmax != (uint16_t)tmpmax){

2426

2080

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

2427

2081

exitcode = EX_USAGE;

2428

2082

goto end;

2429

2083

}

2430

2084

2431

2085

if(quit_now){

2432

2086

goto end;

2433

2087

}

2434

2088

2435

port = (in_port_t)tmpmax;

2089

port = (uint16_t)tmpmax;

2436

2090

*address = '\0';

2437

2091

/* Colon in address indicates IPv6 */

2438

2092

int af;

2454

2108

}

2455

2109

2456

2110

while(not quit_now){

2457

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

2458

&mc);

2111

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

2459

2112

if(quit_now or ret == 0){

2460

2113

break;

2461

2114

}

2463

2116

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

2464

2117

(int)retry_interval);

2465

2118

}

2466

sleep((unsigned int)retry_interval);

2119

sleep((int)retry_interval);

2467

2120

}

2468

2121

2469

if(not quit_now){

2122

if (not quit_now){

2470

2123

exitcode = EXIT_SUCCESS;

2471

2124

}

2472

2125

2487

2140

config.publish_domain = 0;

2488

2141

2489

2142

/* Allocate a new server */

2490

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2491

&config, NULL, NULL, &ret_errno);

2143

mc.server = avahi_server_new(avahi_simple_poll_get

2144

(mc.simple_poll), &config, NULL,

2145

NULL, &error);

2492

2146

2493

2147

/* Free the Avahi configuration data */

2494

2148

avahi_server_config_free(&config);

2497

2151

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

2498

2152

if(mc.server == NULL){

2499

2153

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

2500

avahi_strerror(ret_errno));

2154

avahi_strerror(error));

2501

2155

exitcode = EX_UNAVAILABLE;

2502

2156

goto end;

2503

2157

}

2509

2163

/* Create the Avahi service browser */

2510

2164

sb = avahi_s_service_browser_new(mc.server, if_index,

2511

2165

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2512

NULL, 0, browse_callback,

2513

(void *)&mc);

2166

NULL, 0, browse_callback, NULL);

2514

2167

if(sb == NULL){

2515

2168

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

2516

2169

avahi_strerror(avahi_server_errno(mc.server)));

2527

2180

if(debug){

2528

2181

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

2529

2182

}

2530

2531

ret = avahi_loop_with_timeout(simple_poll,

2532

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

2183

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2533

2186

if(debug){

2534

2187

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

2535

2188

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

2542

2195

}

2543

2196

2544

2197

/* Cleanup things */

2545

free(mc.interfaces);

2546

2547

2198

if(sb != NULL)

2548

2199

avahi_s_service_browser_free(sb);

2549

2200

2550

2201

if(mc.server != NULL)

2551

2202

avahi_server_free(mc.server);

2552

2203

2553

if(simple_poll != NULL)

2554

avahi_simple_poll_free(simple_poll);

2204

if(mc.simple_poll != NULL)

2205

avahi_simple_poll_free(mc.simple_poll);

2555

2206

2556

2207

if(gnutls_initialized){

2557

2208

gnutls_certificate_free_credentials(mc.cred);

2569

2220

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

2570

2221

while(mc.current_server != NULL){

2571

2222

server *next = mc.current_server->next;

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic push

2574

#pragma GCC diagnostic ignored "-Wcast-qual"

2575

#endif

2576

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

2577

#ifdef __GNUC__

2578

#pragma GCC diagnostic pop

2579

#endif

2580

2223

free(mc.current_server);

2581

2224

mc.current_server = next;

2582

2225

}

2583

2226

}

2584

2227

2585

/* Re-raise privileges */

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

2586

2232

{

2587

ret_errno = raise_privileges();

2588

if(ret_errno != 0){

2589

errno = ret_errno;

2590

perror_plus("Failed to raise privileges");

2591

} else {

2592

2593

/* Run network hooks */

2594

run_network_hooks("stop", interfaces_hooks != NULL ?

2595

interfaces_hooks : "", delay);

2596

2597

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

2598

{

2599

char *interface = NULL;

2600

while((interface=argz_next(interfaces_to_take_down,

2601

interfaces_to_take_down_size,

2602

interface))){

2603

ret_errno = take_down_interface(interface);

2604

if(ret_errno != 0){

2605

errno = ret_errno;

2606

perror_plus("Failed to take down interface");

2607

}

2608

}

2609

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

2610

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

2611

" down\n");

2612

}

2613

}

2233

errno = 0;

2234

ret = seteuid(0);

2235

if(ret == -1){

2236

perror_plus("seteuid");

2614

2237

}

2615

2238

2616

ret_errno = lower_privileges_permanently();

2617

if(ret_errno != 0){

2618

errno = ret_errno;

2619

perror_plus("Failed to lower privileges permanently");

2239

/* Take down the network interface */

2240

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

2241

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

2242

if(ret == -1){

2243

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

2245

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

2246

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

2247

if(ret == -1){

2248

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2249

}

2250

}

2251

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

2252

if(ret == -1){

2253

perror_plus("close");

2254

}

2620

2255

}

2621

2256

}

2622

2623

free(interfaces_to_take_down);

2624

free(interfaces_hooks);

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2625

2263

2626

2264

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

2627

if(tempdir != NULL){

2265

if(tempdir_created){

2628

2266

struct dirent **direntries = NULL;

2629

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

2630

O_NOFOLLOW));

2631

if(tempdir_fd == -1){

2632

perror_plus("open");

2633

} else {

2634

#ifdef __GLIBC__

2635

#if __GLIBC_PREREQ(2, 15)

2636

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

2637

notdotentries, alphasort);

2638

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

2639

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

2640

alphasort);

2641

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

2642

#else /* not __GLIBC__ */

2643

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

2644

alphasort);

2645

#endif /* not __GLIBC__ */

2646

if(numentries >= 0){

2647

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

2648

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

2649

if(ret == -1){

2650

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

2651

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

2652

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

2653

}

2654

free(direntries[i]);

2655

}

2656

2657

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

2658

free(direntries);

2659

if(numentries == -1){

2660

perror_plus("scandir");

2661

}

2662

ret = rmdir(tempdir);

2663

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

2664

perror_plus("rmdir");

2665

}

2267

struct dirent *direntry = NULL;

2268

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

2269

alphasort);

2270

if (numentries > 0){

2271

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

2272

direntry = direntries[i];

2273

char *fullname = NULL;

2274

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

2275

direntry->d_name);

2276

if(ret < 0){

2277

perror_plus("asprintf");

2278

continue;

2279

}

2280

ret = remove(fullname);

2281

if(ret == -1){

2282

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

2283

strerror(errno));

2284

}

2285

free(fullname);

2666

2286

}

2667

TEMP_FAILURE_RETRY(close(tempdir_fd));

2287

}

2288

2289

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

2290

free(direntries);

2291

if (numentries == -1){

2292

perror_plus("scandir");

2293

}

2294

ret = rmdir(tempdir);

2295

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

2296

perror_plus("rmdir");

2668

2297

}

2669

2298

}

2670

2299