/mandos/trunk : revision 742

9

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

10

*

11

* Everything else is

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13

12

13

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*

15

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

16

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

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

37

#define _FILE_OFFSET_BITS 64

38

#endif

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#endif /* not _FILE_OFFSET_BITS */

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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() */

44

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

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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(),

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

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inet_pton(), connect(),

59

getnameinfo() */

60

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

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61

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

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62

*/

62

63

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

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64

strtoimax() */

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

76

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

77

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,

88

89

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

89

90

WEXITSTATUS(), WTERMSIG() */

90

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

92

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

95

argz_count() */

96

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

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EAI_SYSTEM, gai_strerror() */

91

98

92

99

#ifdef __linux__

93

100

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

135

142

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

136

143

char *connect_to = NULL;

137

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

138

148

139

149

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

140

150

typedef struct server{

141

151

const char *ip;

142

uint16_t port;

152

in_port_t port;

143

153

AvahiIfIndex if_index;

144

154

int af;

145

155

struct timespec last_seen;

149

159

150

160

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

151

161

typedef struct {

152

AvahiSimplePoll *simple_poll;

153

162

AvahiServer *server;

154

163

gnutls_certificate_credentials_t cred;

155

164

unsigned int dh_bits;

157

166

const char *priority;

158

167

gpgme_ctx_t ctx;

159

168

server *current_server;

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char *interfaces;

170

size_t interfaces_size;

160

171

} mandos_context;

161

172

162

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

163

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

164

.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

167

175

168

176

sig_atomic_t quit_now = 0;

169

177

int signal_received = 0;

170

178

171

179

/* Function to use when printing errors */

172

180

void perror_plus(const char *print_text){

181

int e = errno;

173

182

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

174

183

program_invocation_short_name);

184

errno = e;

175

185

perror(print_text);

176

186

}

177

187

188

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

178

189

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

179

190

va_list ap;

180

191

va_start (ap, format);

181

192

182

193

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

183

194

program_invocation_short_name));

184

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

195

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

185

196

}

186

197

187

198

/*

189

200

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

190

201

* "buffer_length" is how much is already used.

191

202

*/

203

__attribute__((nonnull, warn_unused_result))

192

204

size_t incbuffer(char **buffer, size_t buffer_length,

193

205

size_t buffer_capacity){

194

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

195

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

196

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;

197

213

return 0;

198

214

}

215

*buffer = new_buf;

199

216

buffer_capacity += BUFFER_SIZE;

200

217

}

201

218

return buffer_capacity;

202

219

}

203

220

204

221

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

205

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

206

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){

207

225

int ret;

208

226

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

209

227

if(new_server == NULL){

210

228

perror_plus("malloc");

211

return -1;

229

return false;

212

230

}

213

231

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

214

232

.port = port,

216

234

.af = af };

217

235

if(new_server->ip == NULL){

218

236

perror_plus("strdup");

219

return -1;

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;

220

253

}

221

254

/* Special case of first server */

222

if (mc.current_server == NULL){

255

if(*current_server == NULL){

223

256

new_server->next = new_server;

224

257

new_server->prev = new_server;

225

mc.current_server = new_server;

226

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

258

*current_server = new_server;

227

259

} else {

228

new_server->next = mc.current_server;

229

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;

230

263

new_server->prev->next = new_server;

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;

264

(*current_server)->prev = new_server;

265

}

266

return true;

239

267

}

240

268

241

269

/*

242

270

* Initialize GPGME.

243

271

*/

244

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

245

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){

246

277

gpgme_error_t rc;

247

278

gpgme_engine_info_t engine_info;

248

279

249

250

280

/*

251

281

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

252

282

*/

253

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

254

284

int ret;

255

285

int fd;

256

286

gpgme_data_t pgp_data;

268

298

return false;

269

299

}

270

300

271

rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

272

302

if(rc != GPG_ERR_NO_ERROR){

273

303

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

274

304

gpgme_strsource(rc), gpgme_strerror(rc));

318

348

}

319

349

320

350

/* Create new GPGME "context" */

321

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

351

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

322

352

if(rc != GPG_ERR_NO_ERROR){

323

353

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

324

354

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

337

367

* Decrypt OpenPGP data.

338

368

* Returns -1 on error

339

369

*/

370

__attribute__((nonnull, warn_unused_result))

340

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

341

372

size_t crypto_size,

342

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

343

375

gpgme_data_t dh_crypto, dh_plain;

344

376

gpgme_error_t rc;

345

377

ssize_t ret;

371

403

372

404

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

373

405

data buffer */

374

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

406

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

375

407

if(rc != GPG_ERR_NO_ERROR){

376

408

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

377

409

gpgme_strsource(rc), gpgme_strerror(rc));

378

410

plaintext_length = -1;

379

411

if(debug){

380

412

gpgme_decrypt_result_t result;

381

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

382

414

if(result == NULL){

383

415

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

384

416

} else {

461

493

return plaintext_length;

462

494

}

463

495

464

static const char * safer_gnutls_strerror(int value){

465

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

466

-Wunreachable-code */

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

467

499

if(ret == NULL)

468

500

ret = "(unknown)";

469

501

return ret;

470

502

}

471

503

472

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

473

506

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

474

507

const char* string){

475

508

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

476

509

}

477

510

511

__attribute__((nonnull, warn_unused_result))

478

512

static int init_gnutls_global(const char *pubkeyfilename,

479

const char *seckeyfilename){

513

const char *seckeyfilename,

514

mandos_context *mc){

480

515

int ret;

481

516

482

517

if(debug){

499

534

}

500

535

501

536

/* OpenPGP credentials */

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

503

538

if(ret != GNUTLS_E_SUCCESS){

504

539

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

505

540

safer_gnutls_strerror(ret));

515

550

}

516

551

517

552

ret = gnutls_certificate_set_openpgp_key_file

518

(mc.cred, pubkeyfilename, seckeyfilename,

553

(mc->cred, pubkeyfilename, seckeyfilename,

519

554

GNUTLS_OPENPGP_FMT_BASE64);

520

555

if(ret != GNUTLS_E_SUCCESS){

521

556

fprintf_plus(stderr,

527

562

}

528

563

529

564

/* GnuTLS server initialization */

530

ret = gnutls_dh_params_init(&mc.dh_params);

565

ret = gnutls_dh_params_init(&mc->dh_params);

531

566

if(ret != GNUTLS_E_SUCCESS){

532

567

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

568

" initialization: %s\n",

534

569

safer_gnutls_strerror(ret));

535

570

goto globalfail;

536

571

}

537

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

572

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

538

573

if(ret != GNUTLS_E_SUCCESS){

539

574

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

540

575

safer_gnutls_strerror(ret));

541

576

goto globalfail;

542

577

}

543

578

544

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

579

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

545

580

546

581

return 0;

547

582

548

583

globalfail:

549

584

550

gnutls_certificate_free_credentials(mc.cred);

585

gnutls_certificate_free_credentials(mc->cred);

551

586

gnutls_global_deinit();

552

gnutls_dh_params_deinit(mc.dh_params);

587

gnutls_dh_params_deinit(mc->dh_params);

553

588

return -1;

554

589

}

555

590

556

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){

557

594

int ret;

558

595

/* GnuTLS session creation */

559

596

do {

571

608

{

572

609

const char *err;

573

610

do {

574

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

611

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

575

612

if(quit_now){

576

613

gnutls_deinit(*session);

577

614

return -1;

588

625

589

626

do {

590

627

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

591

mc.cred);

628

mc->cred);

592

629

if(quit_now){

593

630

gnutls_deinit(*session);

594

631

return -1;

604

641

/* ignore client certificate if any. */

605

642

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

606

643

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

608

645

609

646

return 0;

610

647

}

614

651

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

615

652

616

653

/* Called when a Mandos server is found */

617

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,

618

656

AvahiIfIndex if_index,

619

int af){

657

int af, mandos_context *mc){

620

658

int ret, tcp_sd = -1;

621

659

ssize_t sret;

622

union {

623

struct sockaddr_in in;

624

struct sockaddr_in6 in6;

625

} to;

660

struct sockaddr_storage to;

626

661

char *buffer = NULL;

627

662

char *decrypted_buffer = NULL;

628

663

size_t buffer_length = 0;

652

687

return -1;

653

688

}

654

689

655

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);

656

723

if(ret != 0){

657

724

return -1;

658

725

}

659

726

660

727

if(debug){

661

728

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

662

PRIu16 "\n", ip, port);

729

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

663

730

}

664

731

665

732

tcp_sd = socket(pf, SOCK_STREAM, 0);

677

744

678

745

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

679

746

if(af == AF_INET6){

680

to.in6.sin6_family = (sa_family_t)af;

681

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);

682

749

} else { /* IPv4 */

683

to.in.sin_family = (sa_family_t)af;

684

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);

685

752

}

686

753

if(ret < 0 ){

687

754

int e = errno;

696

763

goto mandos_end;

697

764

}

698

765

if(af == AF_INET6){

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*/

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

706

769

if(if_index == AVAHI_IF_UNSPEC){

707

770

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

708

771

" incomplete without a network interface\n");

710

773

goto mandos_end;

711

774

}

712

775

/* Set the network interface number as scope */

713

to.in6.sin6_scope_id = (uint32_t)if_index;

776

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

714

777

}

715

778

} else {

716

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

717

-Wconversion and

718

-Wunreachable-code */

779

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

719

780

}

720

781

721

782

if(quit_now){

729

790

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

730

791

perror_plus("if_indextoname");

731

792

} else {

732

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

733

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

793

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

794

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

734

795

}

735

796

} else {

736

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

737

ip, port);

797

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

798

ip, (uintmax_t)port);

738

799

}

739

800

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

801

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

741

const char *pcret;

742

802

if(af == AF_INET6){

743

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

744

sizeof(addrstr));

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

745

807

} else {

746

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

747

sizeof(addrstr));

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

748

812

}

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

}

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);

755

819

}

756

820

}

757

821

761

825

}

762

826

763

827

if(af == AF_INET6){

764

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

828

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

829

sizeof(struct sockaddr_in6));

765

830

} else {

766

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

831

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

832

sizeof(struct sockaddr_in));

767

833

}

768

834

if(ret < 0){

769

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

835

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

770

836

int e = errno;

771

837

perror_plus("connect");

772

838

errno = e;

818

884

goto mandos_end;

819

885

}

820

886

821

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

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

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);

823

892

824

893

if(quit_now){

825

894

errno = EINTR;

930

999

if(buffer_length > 0){

931

1000

ssize_t decrypted_buffer_size;

932

1001

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

933

&decrypted_buffer);

1002

&decrypted_buffer, mc);

934

1003

if(decrypted_buffer_size >= 0){

935

1004

936

1005

written = 0;

984

1053

return retval;

985

1054

}

986

1055

1056

__attribute__((nonnull))

987

1057

static void resolve_callback(AvahiSServiceResolver *r,

988

1058

AvahiIfIndex interface,

989

1059

AvahiProtocol proto,

997

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

998

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

999

1069

flags,

1000

AVAHI_GCC_UNUSED void* userdata){

1001

assert(r);

1070

void *mc){

1071

if(r == NULL){

1072

return;

1073

}

1002

1074

1003

1075

/* Called whenever a service has been resolved successfully or

1004

1076

timed out */

1005

1077

1006

1078

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1007

1080

return;

1008

1081

}

1009

1082

1013

1086

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

1014

1087

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

1015

1088

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

1089

avahi_strerror(avahi_server_errno

1090

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

1017

1091

break;

1018

1092

1019

1093

case AVAHI_RESOLVER_FOUND:

1025

1099

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

1026

1100

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

1027

1101

}

1028

int ret = start_mandos_communication(ip, port, interface,

1029

avahi_proto_to_af(proto));

1102

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

1103

interface,

1104

avahi_proto_to_af(proto),

1105

mc);

1030

1106

if(ret == 0){

1031

avahi_simple_poll_quit(mc.simple_poll);

1107

avahi_simple_poll_quit(simple_poll);

1032

1108

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

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

}

1035

1115

}

1036

1116

}

1037

1117

}

1047

1127

const char *domain,

1048

1128

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1049

1129

flags,

1050

AVAHI_GCC_UNUSED void* userdata){

1051

assert(b);

1130

void *mc){

1131

if(b == NULL){

1132

return;

1133

}

1052

1134

1053

1135

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

1054

1136

is removed from the LAN */

1062

1144

case AVAHI_BROWSER_FAILURE:

1063

1145

1064

1146

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

1066

avahi_simple_poll_quit(mc.simple_poll);

1147

avahi_strerror(avahi_server_errno

1148

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

1149

avahi_simple_poll_quit(simple_poll);

1067

1150

return;

1068

1151

1069

1152

case AVAHI_BROWSER_NEW:

1072

1155

the callback function is called the Avahi server will free the

1073

1156

resolver for us. */

1074

1157

1075

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

1076

name, type, domain, protocol, 0,

1077

resolve_callback, NULL) == NULL)

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)

1078

1162

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

1079

1163

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

1164

avahi_strerror(avahi_server_errno

1165

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

1081

1166

break;

1082

1167

1083

1168

case AVAHI_BROWSER_REMOVE:

1102

1187

signal_received = sig;

1103

1188

int old_errno = errno;

1104

1189

/* set main loop to exit */

1105

if(mc.simple_poll != NULL){

1106

avahi_simple_poll_quit(mc.simple_poll);

1190

if(simple_poll != NULL){

1191

avahi_simple_poll_quit(simple_poll);

1107

1192

}

1108

1193

errno = old_errno;

1109

1194

}

1110

1195

1196

__attribute__((nonnull, warn_unused_result))

1111

1197

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

1112

1198

int ret;

1199

error_t ret_errno;

1113

1200

1114

1201

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

1115

1202

if(s < 0){

1203

ret_errno = errno;

1116

1204

perror_plus("socket");

1205

errno = ret_errno;

1117

1206

return false;

1118

1207

}

1119

1208

strcpy(ifr->ifr_name, ifname);

1120

1209

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

1210

if(ret == -1){

1122

1211

if(debug){

1212

ret_errno = errno;

1123

1213

perror_plus("ioctl SIOCGIFFLAGS");

1214

errno = ret_errno;

1124

1215

}

1125

1216

return false;

1126

1217

}

1127

1218

return true;

1128

1219

}

1129

1220

1221

__attribute__((nonnull, warn_unused_result))

1130

1222

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

1131

1223

1132

1224

/* Reject the loopback device */

1174

1266

* corresponds to an acceptable network device.

1175

1267

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

1176

1268

*/

1269

__attribute__((nonnull, warn_unused_result))

1177

1270

int good_interface(const struct dirent *if_entry){

1178

1271

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

1179

1272

return 0;

1195

1288

}

1196

1289

1197

1290

/*

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

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))

1240

1325

int notdotentries(const struct dirent *direntry){

1241

1326

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

1242

1327

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

1249

1334

}

1250

1335

1251

1336

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

1337

__attribute__((nonnull, warn_unused_result))

1252

1338

int runnable_hook(const struct dirent *direntry){

1253

1339

int ret;

1254

1340

size_t sret;

1262

1348

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

1263

1349

"abcdefghijklmnopqrstuvwxyz"

1264

1350

"0123456789"

1265

"_-");

1351

"_.-");

1266

1352

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

1267

1353

/* Contains non-allowed characters */

1268

1354

if(debug){

1272

1358

return 0;

1273

1359

}

1274

1360

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);

1361

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

1283

1362

if(ret == -1){

1284

1363

if(debug){

1285

1364

perror_plus("Could not stat hook");

1309

1388

return 1;

1310

1389

}

1311

1390

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1391

__attribute__((nonnull, warn_unused_result))

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

mandos_context *mc){

1313

1394

int ret;

1314

1395

struct timespec now;

1315

1396

struct timespec waited_time;

1316

1397

intmax_t block_time;

1317

1398

1318

1399

while(true){

1319

if(mc.current_server == NULL){

1320

if (debug){

1400

if(mc->current_server == NULL){

1401

if(debug){

1321

1402

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

1322

1403

" No timeout!\n");

1323

1404

}

1324

1405

ret = avahi_simple_poll_iterate(s, -1);

1325

1406

} else {

1326

if (debug){

1407

if(debug){

1327

1408

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

1328

1409

" it, or wait\n");

1329

1410

}

1336

1417

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

1337

1418

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

1338

1419

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1420

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

1340

1421

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1422

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

1342

1423

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

1343

1424

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

1344

1425

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

1346

1427

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

1347

1428

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

1348

1429

1349

if (debug){

1430

if(debug){

1350

1431

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

1351

1432

block_time);

1352

1433

}

1353

1434

1354

1435

if(block_time <= 0){

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);

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);

1359

1440

if(ret == 0){

1360

avahi_simple_poll_quit(mc.simple_poll);

1441

avahi_simple_poll_quit(s);

1361

1442

return 0;

1362

1443

}

1363

1444

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1445

&mc->current_server->last_seen);

1365

1446

if(ret == -1){

1366

1447

perror_plus("clock_gettime");

1367

1448

return -1;

1368

1449

}

1369

mc.current_server = mc.current_server->next;

1450

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

1370

1451

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

1371

1452

servers, but don't block */

1372

1453

}

1374

1455

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

1375

1456

}

1376

1457

if(ret != 0){

1377

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

1458

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

1378

1459

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

1379

1460

}

1380

1461

}

1381

1462

}

1382

1463

}

1383

1464

1384

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

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,

1385

1519

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

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__ */

1391

1547

if(numhooks == -1){

1392

1548

perror_plus("scandir");

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){

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){

1400

1621

perror_plus("asprintf");

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

}

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

1469

1626

free(delaystring);

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;

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;

1509

1900

}

1510

1901

1511

1902

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

1903

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

1904

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

1905

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

1906

.interfaces = NULL, .interfaces_size = 0 };

1512

1907

AvahiSServiceBrowser *sb = NULL;

1513

int error;

1908

error_t ret_errno;

1514

1909

int ret;

1515

1910

intmax_t tmpmax;

1516

1911

char *tmp;

1517

1912

int exitcode = EXIT_SUCCESS;

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;

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;

1526

1918

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1527

1919

const char *seckey = PATHDIR "/" SECKEY;

1528

1920

const char *pubkey = PATHDIR "/" PUBKEY;

1921

char *interfaces_hooks = NULL;

1529

1922

1530

1923

bool gnutls_initialized = false;

1531

1924

bool gpgme_initialized = false;

1593

1986

.group = 2 },

1594

1987

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

1595

1988

.arg = "SECONDS",

1596

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

1989

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

1597

1990

.group = 2 },

1598

1991

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

1599

1992

.arg = "DIR",

1622

2015

connect_to = arg;

1623

2016

break;

1624

2017

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

1625

interface = arg;

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

}

1626

2023

break;

1627

2024

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

1628

2025

seckey = arg;

1671

2068

argp_state_help(state, state->out_stream,

1672

2069

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

2070

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

2071

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

1677

2072

exit(argp_err_exit_status);

1678

2073

break;

1707

2102

/* Work around Debian bug #633582:

1708

2103

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

1709

2104

1710

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

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");

1715

2110

} else {

1716

2111

struct stat st;

1717

2112

1758

2153

}

1759

2154

1760

2155

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

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;

1765

2177

}

1766

2178

}

1767

2179

}

1768

2180

1769

2181

/* Run network hooks */

1770

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

1771

goto end;

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);

1772

2194

}

1773

2195

1774

2196

if(not debug){

1775

2197

avahi_set_log_function(empty_log);

1776

2198

}

1777

2199

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

1810

2200

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

1811

2201

from the signal handler */

1812

2202

/* Initialize the pseudo-RNG for Avahi */

1813

2203

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

1814

mc.simple_poll = avahi_simple_poll_new();

1815

if(mc.simple_poll == NULL){

2204

simple_poll = avahi_simple_poll_new();

2205

if(simple_poll == NULL){

1816

2206

fprintf_plus(stderr,

1817

2207

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

1818

2208

exitcode = EX_UNAVAILABLE;

1882

2272

}

1883

2273

}

1884

2274

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");

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;

1970

2326

}

1971

2327

}

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){

1989

2328

break;

1990

2329

}

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

}

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);

2020

2357

}

2021

2358

2022

2359

if(quit_now){

2023

2360

goto end;

2024

2361

}

2025

2362

2026

ret = init_gnutls_global(pubkey, seckey);

2363

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

2027

2364

if(ret == -1){

2028

2365

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

2029

2366

exitcode = EX_UNAVAILABLE;

2036

2373

goto end;

2037

2374

}

2038

2375

2039

if(mkdtemp(tempdir) == NULL){

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){

2040

2386

perror_plus("mkdtemp");

2041

2387

goto end;

2042

2388

}

2043

tempdir_created = true;

2044

2389

2045

2390

if(quit_now){

2046

2391

goto end;

2047

2392

}

2048

2393

2049

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

2394

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

2050

2395

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

2051

2396

exitcode = EX_UNAVAILABLE;

2052

2397

goto end;

2062

2407

/* Connect directly, do not use Zeroconf */

2063

2408

/* (Mainly meant for debugging) */

2064

2409

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

2410

2065

2411

if(address == NULL){

2066

2412

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

2067

2413

exitcode = EX_USAGE;

2072

2418

goto end;

2073

2419

}

2074

2420

2075

uint16_t port;

2421

in_port_t port;

2076

2422

errno = 0;

2077

2423

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

2078

2424

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

2079

or tmpmax != (uint16_t)tmpmax){

2425

or tmpmax != (in_port_t)tmpmax){

2080

2426

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

2081

2427

exitcode = EX_USAGE;

2082

2428

goto end;

2083

2429

}

2084

2430

2085

2431

if(quit_now){

2086

2432

goto end;

2087

2433

}

2088

2434

2089

port = (uint16_t)tmpmax;

2435

port = (in_port_t)tmpmax;

2090

2436

*address = '\0';

2091

2437

/* Colon in address indicates IPv6 */

2092

2438

int af;

2108

2454

}

2109

2455

2110

2456

while(not quit_now){

2111

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

2457

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

2458

&mc);

2112

2459

if(quit_now or ret == 0){

2113

2460

break;

2114

2461

}

2116

2463

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

2117

2464

(int)retry_interval);

2118

2465

}

2119

sleep((int)retry_interval);

2466

sleep((unsigned int)retry_interval);

2120

2467

}

2121

2468

2122

if (not quit_now){

2469

if(not quit_now){

2123

2470

exitcode = EXIT_SUCCESS;

2124

2471

}

2125

2472

2140

2487

config.publish_domain = 0;

2141

2488

2142

2489

/* Allocate a new server */

2143

mc.server = avahi_server_new(avahi_simple_poll_get

2144

(mc.simple_poll), &config, NULL,

2145

NULL, &error);

2490

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2491

&config, NULL, NULL, &ret_errno);

2146

2492

2147

2493

/* Free the Avahi configuration data */

2148

2494

avahi_server_config_free(&config);

2151

2497

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

2152

2498

if(mc.server == NULL){

2153

2499

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

2154

avahi_strerror(error));

2500

avahi_strerror(ret_errno));

2155

2501

exitcode = EX_UNAVAILABLE;

2156

2502

goto end;

2157

2503

}

2163

2509

/* Create the Avahi service browser */

2164

2510

sb = avahi_s_service_browser_new(mc.server, if_index,

2165

2511

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2166

NULL, 0, browse_callback, NULL);

2512

NULL, 0, browse_callback,

2513

(void *)&mc);

2167

2514

if(sb == NULL){

2168

2515

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

2169

2516

avahi_strerror(avahi_server_errno(mc.server)));

2180

2527

if(debug){

2181

2528

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

2182

2529

}

2183

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2530

2531

ret = avahi_loop_with_timeout(simple_poll,

2532

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

2186

2533

if(debug){

2187

2534

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

2188

2535

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

2195

2542

}

2196

2543

2197

2544

/* Cleanup things */

2545

free(mc.interfaces);

2546

2198

2547

if(sb != NULL)

2199

2548

avahi_s_service_browser_free(sb);

2200

2549

2201

2550

if(mc.server != NULL)

2202

2551

avahi_server_free(mc.server);

2203

2552

2204

if(mc.simple_poll != NULL)

2205

avahi_simple_poll_free(mc.simple_poll);

2553

if(simple_poll != NULL)

2554

avahi_simple_poll_free(simple_poll);

2206

2555

2207

2556

if(gnutls_initialized){

2208

2557

gnutls_certificate_free_credentials(mc.cred);

2220

2569

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

2221

2570

while(mc.current_server != NULL){

2222

2571

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

2223

2580

free(mc.current_server);

2224

2581

mc.current_server = next;

2225

2582

}

2226

2583

}

2227

2584

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

2585

/* Re-raise privileges */

2232

2586

{

2233

errno = 0;

2234

ret = seteuid(0);

2235

if(ret == -1){

2236

perror_plus("seteuid");

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

}

2237

2614

}

2238

2615

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

}

2616

ret_errno = lower_privileges_permanently();

2617

if(ret_errno != 0){

2618

errno = ret_errno;

2619

perror_plus("Failed to lower privileges permanently");

2255

2620

}

2256

2621

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2622

2623

free(interfaces_to_take_down);

2624

free(interfaces_hooks);

2263

2625

2264

2626

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

2265

if(tempdir_created){

2627

if(tempdir != NULL){

2266

2628

struct dirent **direntries = NULL;

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);

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

}

2286

2666

}

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");

2667

TEMP_FAILURE_RETRY(close(tempdir_fd));

2297

2668

}

2298

2669

}

2299

2670