/mandos/trunk : revision 693

9

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

10

*

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* Everything else is

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13

12

13

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*

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

38

#endif

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#endif /* not _FILE_OFFSET_BITS */

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40

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

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42

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

43

stdout, ferror(), remove() */

44

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

44

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

45

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

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

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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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inet_pton(), connect(),

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getnameinfo() */

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60

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

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61

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

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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() */

74

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

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

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

77

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

77

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

78

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

79

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

80

argp_state, struct argp,

88

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

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WEXITSTATUS(), WTERMSIG() */

90

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

91

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

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argz_delete(), argz_append(),

93

argz_stringify(), argz_add(),

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argz_count() */

95

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

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EAI_SYSTEM, gai_strerror() */

91

97

92

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#ifdef __linux__

93

99

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

135

141

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

136

142

char *connect_to = NULL;

137

143

const char *hookdir = HOOKDIR;

144

int hookdir_fd = -1;

145

uid_t uid = 65534;

146

gid_t gid = 65534;

138

147

139

148

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

140

149

typedef struct server{

141

150

const char *ip;

142

uint16_t port;

151

in_port_t port;

143

152

AvahiIfIndex if_index;

144

153

int af;

145

154

struct timespec last_seen;

149

158

150

159

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

151

160

typedef struct {

152

AvahiSimplePoll *simple_poll;

153

161

AvahiServer *server;

154

162

gnutls_certificate_credentials_t cred;

155

163

unsigned int dh_bits;

157

165

const char *priority;

158

166

gpgme_ctx_t ctx;

159

167

server *current_server;

168

char *interfaces;

169

size_t interfaces_size;

160

170

} mandos_context;

161

171

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 };

172

/* global so signal handler can reach it*/

173

AvahiSimplePoll *simple_poll;

167

174

168

175

sig_atomic_t quit_now = 0;

169

176

int signal_received = 0;

170

177

171

178

/* Function to use when printing errors */

172

179

void perror_plus(const char *print_text){

180

int e = errno;

173

181

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

174

182

program_invocation_short_name);

183

errno = e;

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184

perror(print_text);

176

185

}

177

186

187

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

178

188

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

179

189

va_list ap;

180

190

va_start (ap, format);

181

191

182

192

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

183

193

program_invocation_short_name));

184

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

194

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

185

195

}

186

196

187

197

/*

189

199

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

190

200

* "buffer_length" is how much is already used.

191

201

*/

202

__attribute__((nonnull, warn_unused_result))

192

203

size_t incbuffer(char **buffer, size_t buffer_length,

193

204

size_t buffer_capacity){

194

205

if(buffer_length + BUFFER_SIZE > buffer_capacity){

195

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

196

if(buffer == NULL){

206

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

207

if(new_buf == NULL){

208

int old_errno = errno;

209

free(*buffer);

210

errno = old_errno;

211

*buffer = NULL;

197

212

return 0;

198

213

}

214

*buffer = new_buf;

199

215

buffer_capacity += BUFFER_SIZE;

200

216

}

201

217

return buffer_capacity;

202

218

}

203

219

204

220

/* 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){

221

__attribute__((nonnull, warn_unused_result))

222

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

223

int af, server **current_server){

207

224

int ret;

208

225

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

209

226

if(new_server == NULL){

210

227

perror_plus("malloc");

211

return -1;

228

return false;

212

229

}

213

230

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

214

231

.port = port,

216

233

.af = af };

217

234

if(new_server->ip == NULL){

218

235

perror_plus("strdup");

219

return -1;

236

return false;

237

}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

220

242

}

221

243

/* Special case of first server */

222

if (mc.current_server == NULL){

244

if(*current_server == NULL){

223

245

new_server->next = new_server;

224

246

new_server->prev = new_server;

225

mc.current_server = new_server;

226

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

247

*current_server = new_server;

227

248

} else {

228

new_server->next = mc.current_server;

229

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

249

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

250

new_server->next = *current_server;

251

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

230

252

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;

253

(*current_server)->prev = new_server;

254

}

255

return true;

239

256

}

240

257

241

258

/*

242

259

* Initialize GPGME.

243

260

*/

244

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

245

const char *tempdir){

261

__attribute__((nonnull, warn_unused_result))

262

static bool init_gpgme(const char * const seckey,

263

const char * const pubkey,

264

const char * const tempdir,

265

mandos_context *mc){

246

266

gpgme_error_t rc;

247

267

gpgme_engine_info_t engine_info;

248

268

249

250

269

/*

251

270

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

252

271

*/

253

bool import_key(const char *filename){

272

bool import_key(const char * const filename){

254

273

int ret;

255

274

int fd;

256

275

gpgme_data_t pgp_data;

268

287

return false;

269

288

}

270

289

271

rc = gpgme_op_import(mc.ctx, pgp_data);

290

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

272

291

if(rc != GPG_ERR_NO_ERROR){

273

292

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

274

293

gpgme_strsource(rc), gpgme_strerror(rc));

318

337

}

319

338

320

339

/* Create new GPGME "context" */

321

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

340

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

322

341

if(rc != GPG_ERR_NO_ERROR){

323

342

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

324

343

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

337

356

* Decrypt OpenPGP data.

338

357

* Returns -1 on error

339

358

*/

359

__attribute__((nonnull, warn_unused_result))

340

360

static ssize_t pgp_packet_decrypt(const char *cryptotext,

341

361

size_t crypto_size,

342

char **plaintext){

362

char **plaintext,

363

mandos_context *mc){

343

364

gpgme_data_t dh_crypto, dh_plain;

344

365

gpgme_error_t rc;

345

366

ssize_t ret;

371

392

372

393

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

373

394

data buffer */

374

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

395

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

375

396

if(rc != GPG_ERR_NO_ERROR){

376

397

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

377

398

gpgme_strsource(rc), gpgme_strerror(rc));

378

399

plaintext_length = -1;

379

400

if(debug){

380

401

gpgme_decrypt_result_t result;

381

result = gpgme_op_decrypt_result(mc.ctx);

402

result = gpgme_op_decrypt_result(mc->ctx);

382

403

if(result == NULL){

383

404

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

384

405

} else {

461

482

return plaintext_length;

462

483

}

463

484

464

static const char * safer_gnutls_strerror(int value){

465

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

466

-Wunreachable-code */

485

__attribute__((warn_unused_result))

486

static const char *safer_gnutls_strerror(int value){

487

const char *ret = gnutls_strerror(value);

467

488

if(ret == NULL)

468

489

ret = "(unknown)";

469

490

return ret;

470

491

}

471

492

472

493

/* GnuTLS log function callback */

494

__attribute__((nonnull))

473

495

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

474

496

const char* string){

475

497

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

476

498

}

477

499

500

__attribute__((nonnull, warn_unused_result))

478

501

static int init_gnutls_global(const char *pubkeyfilename,

479

const char *seckeyfilename){

502

const char *seckeyfilename,

503

mandos_context *mc){

480

504

int ret;

481

505

482

506

if(debug){

499

523

}

500

524

501

525

/* OpenPGP credentials */

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

526

ret = gnutls_certificate_allocate_credentials(&mc->cred);

503

527

if(ret != GNUTLS_E_SUCCESS){

504

528

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

505

529

safer_gnutls_strerror(ret));

515

539

}

516

540

517

541

ret = gnutls_certificate_set_openpgp_key_file

518

(mc.cred, pubkeyfilename, seckeyfilename,

542

(mc->cred, pubkeyfilename, seckeyfilename,

519

543

GNUTLS_OPENPGP_FMT_BASE64);

520

544

if(ret != GNUTLS_E_SUCCESS){

521

545

fprintf_plus(stderr,

527

551

}

528

552

529

553

/* GnuTLS server initialization */

530

ret = gnutls_dh_params_init(&mc.dh_params);

554

ret = gnutls_dh_params_init(&mc->dh_params);

531

555

if(ret != GNUTLS_E_SUCCESS){

532

556

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

557

" initialization: %s\n",

534

558

safer_gnutls_strerror(ret));

535

559

goto globalfail;

536

560

}

537

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

561

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

538

562

if(ret != GNUTLS_E_SUCCESS){

539

563

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

540

564

safer_gnutls_strerror(ret));

541

565

goto globalfail;

542

566

}

543

567

544

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

568

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

545

569

546

570

return 0;

547

571

548

572

globalfail:

549

573

550

gnutls_certificate_free_credentials(mc.cred);

574

gnutls_certificate_free_credentials(mc->cred);

551

575

gnutls_global_deinit();

552

gnutls_dh_params_deinit(mc.dh_params);

576

gnutls_dh_params_deinit(mc->dh_params);

553

577

return -1;

554

578

}

555

579

556

static int init_gnutls_session(gnutls_session_t *session){

580

__attribute__((nonnull, warn_unused_result))

581

static int init_gnutls_session(gnutls_session_t *session,

582

mandos_context *mc){

557

583

int ret;

558

584

/* GnuTLS session creation */

559

585

do {

571

597

{

572

598

const char *err;

573

599

do {

574

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

600

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

575

601

if(quit_now){

576

602

gnutls_deinit(*session);

577

603

return -1;

588

614

589

615

do {

590

616

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

591

mc.cred);

617

mc->cred);

592

618

if(quit_now){

593

619

gnutls_deinit(*session);

594

620

return -1;

604

630

/* ignore client certificate if any. */

605

631

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

606

632

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

633

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

608

634

609

635

return 0;

610

636

}

614

640

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

615

641

616

642

/* Called when a Mandos server is found */

617

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

643

__attribute__((nonnull, warn_unused_result))

644

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

618

645

AvahiIfIndex if_index,

619

int af){

646

int af, mandos_context *mc){

620

647

int ret, tcp_sd = -1;

621

648

ssize_t sret;

622

union {

623

struct sockaddr_in in;

624

struct sockaddr_in6 in6;

625

} to;

649

struct sockaddr_storage to;

626

650

char *buffer = NULL;

627

651

char *decrypted_buffer = NULL;

628

652

size_t buffer_length = 0;

652

676

return -1;

653

677

}

654

678

655

ret = init_gnutls_session(&session);

679

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

680

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

681

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

682

bool match = false;

683

{

684

char *interface = NULL;

685

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

686

interface))){

687

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

688

match = true;

689

break;

690

}

691

}

692

}

693

if(not match){

694

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

695

connect to the server */

696

if(debug){

697

char interface[IF_NAMESIZE];

698

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

699

perror_plus("if_indextoname");

700

} else {

701

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

702

" \"%s\"\n",

703

if_indextoname((unsigned int)if_index,

704

interface));

705

}

706

}

707

return -1;

708

}

709

}

710

711

ret = init_gnutls_session(&session, mc);

656

712

if(ret != 0){

657

713

return -1;

658

714

}

659

715

660

716

if(debug){

661

717

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

662

PRIu16 "\n", ip, port);

718

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

663

719

}

664

720

665

721

tcp_sd = socket(pf, SOCK_STREAM, 0);

677

733

678

734

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

679

735

if(af == AF_INET6){

680

to.in6.sin6_family = (sa_family_t)af;

681

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

736

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

737

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

682

738

} else { /* IPv4 */

683

to.in.sin_family = (sa_family_t)af;

684

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

739

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

740

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

685

741

}

686

742

if(ret < 0 ){

687

743

int e = errno;

696

752

goto mandos_end;

697

753

}

698

754

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*/

755

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

756

if(IN6_IS_ADDR_LINKLOCAL

757

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

706

758

if(if_index == AVAHI_IF_UNSPEC){

707

759

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

708

760

" incomplete without a network interface\n");

710

762

goto mandos_end;

711

763

}

712

764

/* Set the network interface number as scope */

713

to.in6.sin6_scope_id = (uint32_t)if_index;

765

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

714

766

}

715

767

} else {

716

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

717

-Wconversion and

718

-Wunreachable-code */

768

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

719

769

}

720

770

721

771

if(quit_now){

729

779

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

730

780

perror_plus("if_indextoname");

731

781

} else {

732

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

733

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

782

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

783

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

734

784

}

735

785

} else {

736

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

737

ip, port);

786

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

787

ip, (uintmax_t)port);

738

788

}

739

789

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

790

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

741

const char *pcret;

742

791

if(af == AF_INET6){

743

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

744

sizeof(addrstr));

792

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

793

sizeof(struct sockaddr_in6),

794

addrstr, sizeof(addrstr), NULL, 0,

795

NI_NUMERICHOST);

745

796

} else {

746

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

747

sizeof(addrstr));

797

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

798

sizeof(struct sockaddr_in),

799

addrstr, sizeof(addrstr), NULL, 0,

800

NI_NUMERICHOST);

748

801

}

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

}

802

if(ret == EAI_SYSTEM){

803

perror_plus("getnameinfo");

804

} else if(ret != 0) {

805

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

806

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

807

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

755

808

}

756

809

}

757

810

761

814

}

762

815

763

816

if(af == AF_INET6){

764

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

817

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

818

sizeof(struct sockaddr_in6));

765

819

} else {

766

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

820

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

821

sizeof(struct sockaddr_in));

767

822

}

768

823

if(ret < 0){

769

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

824

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

770

825

int e = errno;

771

826

perror_plus("connect");

772

827

errno = e;

818

873

goto mandos_end;

819

874

}

820

875

821

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

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

876

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

877

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

878

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

879

gnutls_transport_set_ptr(session,

880

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

823

881

824

882

if(quit_now){

825

883

errno = EINTR;

930

988

if(buffer_length > 0){

931

989

ssize_t decrypted_buffer_size;

932

990

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

933

&decrypted_buffer);

991

&decrypted_buffer, mc);

934

992

if(decrypted_buffer_size >= 0){

935

993

936

994

written = 0;

984

1042

return retval;

985

1043

}

986

1044

1045

__attribute__((nonnull))

987

1046

static void resolve_callback(AvahiSServiceResolver *r,

988

1047

AvahiIfIndex interface,

989

1048

AvahiProtocol proto,

997

1056

AVAHI_GCC_UNUSED AvahiStringList *txt,

998

1057

AVAHI_GCC_UNUSED AvahiLookupResultFlags

999

1058

flags,

1000

AVAHI_GCC_UNUSED void* userdata){

1001

assert(r);

1059

void *mc){

1060

if(r == NULL){

1061

return;

1062

}

1002

1063

1003

1064

/* Called whenever a service has been resolved successfully or

1004

1065

timed out */

1013

1074

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

1014

1075

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

1015

1076

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_strerror(avahi_server_errno

1078

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

1017

1079

break;

1018

1080

1019

1081

case AVAHI_RESOLVER_FOUND:

1025

1087

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

1026

1088

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

1027

1089

}

1028

int ret = start_mandos_communication(ip, port, interface,

1029

avahi_proto_to_af(proto));

1090

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

1091

interface,

1092

avahi_proto_to_af(proto),

1093

mc);

1030

1094

if(ret == 0){

1031

avahi_simple_poll_quit(mc.simple_poll);

1095

avahi_simple_poll_quit(simple_poll);

1032

1096

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

1097

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

1098

avahi_proto_to_af(proto),

1099

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

1100

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

1101

" list\n", name);

1102

}

1035

1103

}

1036

1104

}

1037

1105

}

1047

1115

const char *domain,

1048

1116

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1049

1117

flags,

1050

AVAHI_GCC_UNUSED void* userdata){

1051

assert(b);

1118

void *mc){

1119

if(b == NULL){

1120

return;

1121

}

1052

1122

1053

1123

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

1054

1124

is removed from the LAN */

1062

1132

case AVAHI_BROWSER_FAILURE:

1063

1133

1064

1134

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

1066

avahi_simple_poll_quit(mc.simple_poll);

1135

avahi_strerror(avahi_server_errno

1136

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

1137

avahi_simple_poll_quit(simple_poll);

1067

1138

return;

1068

1139

1069

1140

case AVAHI_BROWSER_NEW:

1072

1143

the callback function is called the Avahi server will free the

1073

1144

resolver for us. */

1074

1145

1075

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

1076

name, type, domain, protocol, 0,

1077

resolve_callback, NULL) == NULL)

1146

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

1147

interface, protocol, name, type,

1148

domain, protocol, 0,

1149

resolve_callback, mc) == NULL)

1078

1150

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

1079

1151

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

1152

avahi_strerror(avahi_server_errno

1153

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

1081

1154

break;

1082

1155

1083

1156

case AVAHI_BROWSER_REMOVE:

1102

1175

signal_received = sig;

1103

1176

int old_errno = errno;

1104

1177

/* set main loop to exit */

1105

if(mc.simple_poll != NULL){

1106

avahi_simple_poll_quit(mc.simple_poll);

1178

if(simple_poll != NULL){

1179

avahi_simple_poll_quit(simple_poll);

1107

1180

}

1108

1181

errno = old_errno;

1109

1182

}

1110

1183

1184

__attribute__((nonnull, warn_unused_result))

1111

1185

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

1112

1186

int ret;

1187

error_t ret_errno;

1113

1188

1114

1189

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

1115

1190

if(s < 0){

1191

ret_errno = errno;

1116

1192

perror_plus("socket");

1193

errno = ret_errno;

1117

1194

return false;

1118

1195

}

1119

1196

strcpy(ifr->ifr_name, ifname);

1120

1197

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

1198

if(ret == -1){

1122

1199

if(debug){

1200

ret_errno = errno;

1123

1201

perror_plus("ioctl SIOCGIFFLAGS");

1202

errno = ret_errno;

1124

1203

}

1125

1204

return false;

1126

1205

}

1127

1206

return true;

1128

1207

}

1129

1208

1209

__attribute__((nonnull, warn_unused_result))

1130

1210

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

1131

1211

1132

1212

/* Reject the loopback device */

1174

1254

* corresponds to an acceptable network device.

1175

1255

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

1176

1256

*/

1257

__attribute__((nonnull, warn_unused_result))

1177

1258

int good_interface(const struct dirent *if_entry){

1178

1259

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

1179

1260

return 0;

1195

1276

}

1196

1277

1197

1278

/*

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

1279

* This function determines if a network interface is up.

1280

*/

1281

__attribute__((nonnull, warn_unused_result))

1282

bool interface_is_up(const char *interface){

1283

struct ifreq ifr;

1284

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

1285

if(debug){

1286

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

1287

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

1288

}

1289

return false;

1290

}

1291

1292

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

1293

}

1294

1295

/*

1296

* This function determines if a network interface is running

1297

*/

1298

__attribute__((nonnull, warn_unused_result))

1299

bool interface_is_running(const char *interface){

1300

struct ifreq ifr;

1301

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

1302

if(debug){

1303

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

1304

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

1305

}

1306

return false;

1307

}

1308

1309

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

1310

}

1311

1312

__attribute__((nonnull, pure, warn_unused_result))

1240

1313

int notdotentries(const struct dirent *direntry){

1241

1314

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

1242

1315

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

1249

1322

}

1250

1323

1251

1324

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

1325

__attribute__((nonnull, warn_unused_result))

1252

1326

int runnable_hook(const struct dirent *direntry){

1253

1327

int ret;

1254

1328

size_t sret;

1262

1336

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

1263

1337

"abcdefghijklmnopqrstuvwxyz"

1264

1338

"0123456789"

1265

"_-");

1339

"_.-");

1266

1340

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

1267

1341

/* Contains non-allowed characters */

1268

1342

if(debug){

1272

1346

return 0;

1273

1347

}

1274

1348

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);

1349

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

1283

1350

if(ret == -1){

1284

1351

if(debug){

1285

1352

perror_plus("Could not stat hook");

1309

1376

return 1;

1310

1377

}

1311

1378

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1379

__attribute__((nonnull, warn_unused_result))

1380

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1381

mandos_context *mc){

1313

1382

int ret;

1314

1383

struct timespec now;

1315

1384

struct timespec waited_time;

1316

1385

intmax_t block_time;

1317

1386

1318

1387

while(true){

1319

if(mc.current_server == NULL){

1320

if (debug){

1388

if(mc->current_server == NULL){

1389

if(debug){

1321

1390

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

1322

1391

" No timeout!\n");

1323

1392

}

1324

1393

ret = avahi_simple_poll_iterate(s, -1);

1325

1394

} else {

1326

if (debug){

1395

if(debug){

1327

1396

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

1328

1397

" it, or wait\n");

1329

1398

}

1336

1405

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

1337

1406

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

1338

1407

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1408

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

1340

1409

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1410

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

1342

1411

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

1343

1412

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

1344

1413

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

1346

1415

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

1347

1416

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

1348

1417

1349

if (debug){

1418

if(debug){

1350

1419

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

1351

1420

block_time);

1352

1421

}

1353

1422

1354

1423

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);

1424

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

1425

mc->current_server->port,

1426

mc->current_server->if_index,

1427

mc->current_server->af, mc);

1359

1428

if(ret == 0){

1360

avahi_simple_poll_quit(mc.simple_poll);

1429

avahi_simple_poll_quit(s);

1361

1430

return 0;

1362

1431

}

1363

1432

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1433

&mc->current_server->last_seen);

1365

1434

if(ret == -1){

1366

1435

perror_plus("clock_gettime");

1367

1436

return -1;

1368

1437

}

1369

mc.current_server = mc.current_server->next;

1438

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

1370

1439

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

1371

1440

servers, but don't block */

1372

1441

}

1374

1443

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

1375

1444

}

1376

1445

if(ret != 0){

1377

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

1446

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

1378

1447

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

1379

1448

}

1380

1449

}

1381

1450

}

1382

1451

}

1383

1452

1384

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

1453

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

1454

__attribute__((warn_unused_result))

1455

error_t raise_privileges(void){

1456

error_t old_errno = errno;

1457

error_t ret_errno = 0;

1458

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

1459

ret_errno = errno;

1460

perror_plus("seteuid");

1461

}

1462

errno = old_errno;

1463

return ret_errno;

1464

}

1465

1466

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

1467

__attribute__((warn_unused_result))

1468

error_t raise_privileges_permanently(void){

1469

error_t old_errno = errno;

1470

error_t ret_errno = raise_privileges();

1471

if(ret_errno != 0){

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

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

1476

ret_errno = errno;

1477

perror_plus("seteuid");

1478

}

1479

errno = old_errno;

1480

return ret_errno;

1481

}

1482

1483

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

1484

__attribute__((warn_unused_result))

1485

error_t lower_privileges(void){

1486

error_t old_errno = errno;

1487

error_t ret_errno = 0;

1488

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

1489

ret_errno = errno;

1490

perror_plus("seteuid");

1491

}

1492

errno = old_errno;

1493

return ret_errno;

1494

}

1495

1496

/* Lower privileges permanently */

1497

__attribute__((warn_unused_result))

1498

error_t lower_privileges_permanently(void){

1499

error_t old_errno = errno;

1500

error_t ret_errno = 0;

1501

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

1502

ret_errno = errno;

1503

perror_plus("setuid");

1504

}

1505

errno = old_errno;

1506

return ret_errno;

1507

}

1508

1509

#ifndef O_CLOEXEC

1510

/*

1511

* Based on the example in the GNU LibC manual chapter 13.13 "File

1512

* Descriptor Flags".

1513

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

1514

*/

1515

__attribute__((warn_unused_result))

1516

static int set_cloexec_flag(int fd){

1517

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

1518

/* If reading the flags failed, return error indication now. */

1519

if(ret < 0){

1520

return ret;

1521

}

1522

/* Store modified flag word in the descriptor. */

1523

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

1524

ret | FD_CLOEXEC));

1525

}

1526

#endif /* not O_CLOEXEC */

1527

1528

__attribute__((nonnull))

1529

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

1385

1530

const float delay){

1386

1531

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1532

if(hookdir_fd == -1){

1533

hookdir_fd = open(hookdir, O_RDONLY |

1534

#ifdef O_CLOEXEC

1535

O_CLOEXEC

1536

#else /* not O_CLOEXEC */

1537

0

1538

#endif /* not O_CLOEXEC */

1539

);

1540

if(hookdir_fd == -1){

1541

if(errno == ENOENT){

1542

if(debug){

1543

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

1544

" found\n", hookdir);

1545

}

1546

} else {

1547

perror_plus("open");

1548

}

1549

return;

1550

}

1551

#ifndef O_CLOEXEC

1552

if(set_cloexec_flag(hookdir_fd) < 0){

1553

perror_plus("set_cloexec_flag");

1554

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

1555

perror_plus("close");

1556

} else {

1557

hookdir_fd = -1;

1558

}

1559

return;

1560

}

1561

#endif /* not O_CLOEXEC */

1562

}

1563

#ifdef __GLIBC__

1564

#if __GLIBC_PREREQ(2, 15)

1565

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

1566

runnable_hook, alphasort);

1567

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

1568

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

1569

alphasort);

1570

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

1571

#else /* not __GLIBC__ */

1572

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

1573

alphasort);

1574

#endif /* not __GLIBC__ */

1391

1575

if(numhooks == -1){

1392

1576

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){

1577

return;

1578

}

1579

struct dirent *direntry;

1580

int ret;

1581

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

1582

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

1583

direntry = direntries[i];

1584

if(debug){

1585

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

1586

direntry->d_name);

1587

}

1588

pid_t hook_pid = fork();

1589

if(hook_pid == 0){

1590

/* Child */

1591

/* Raise privileges */

1592

if(raise_privileges_permanently() != 0){

1593

perror_plus("Failed to raise privileges");

1594

_exit(EX_NOPERM);

1595

}

1596

/* Set group */

1597

errno = 0;

1598

ret = setgid(0);

1599

if(ret == -1){

1600

perror_plus("setgid");

1601

_exit(EX_NOPERM);

1602

}

1603

/* Reset supplementary groups */

1604

errno = 0;

1605

ret = setgroups(0, NULL);

1606

if(ret == -1){

1607

perror_plus("setgroups");

1608

_exit(EX_NOPERM);

1609

}

1610

ret = dup2(devnull, STDIN_FILENO);

1611

if(ret == -1){

1612

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

1613

_exit(EX_OSERR);

1614

}

1615

ret = close(devnull);

1616

if(ret == -1){

1617

perror_plus("close");

1618

_exit(EX_OSERR);

1619

}

1620

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1621

if(ret == -1){

1622

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

1623

_exit(EX_OSERR);

1624

}

1625

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

1626

if(ret == -1){

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

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

1631

if(ret == -1){

1632

perror_plus("setenv");

1633

_exit(EX_OSERR);

1634

}

1635

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

1636

if(ret == -1){

1637

perror_plus("setenv");

1638

_exit(EX_OSERR);

1639

}

1640

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

1641

if(ret == -1){

1642

perror_plus("setenv");

1643

_exit(EX_OSERR);

1644

}

1645

char *delaystring;

1646

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

1647

if(ret == -1){

1400

1648

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

}

1649

_exit(EX_OSERR);

1650

}

1651

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

1652

if(ret == -1){

1469

1653

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;

1654

perror_plus("setenv");

1655

_exit(EX_OSERR);

1656

}

1657

free(delaystring);

1658

if(connect_to != NULL){

1659

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

1660

if(ret == -1){

1661

perror_plus("setenv");

1662

_exit(EX_OSERR);

1663

}

1664

}

1665

if(fexecve(hookdir_fd, (char *const [])

1666

{ direntry->d_name, NULL }, environ) == -1){

1667

perror_plus("fexecve");

1668

_exit(EXIT_FAILURE);

1669

}

1670

} else {

1671

int status;

1672

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

1673

perror_plus("waitpid");

1674

continue;

1675

}

1676

if(WIFEXITED(status)){

1677

if(WEXITSTATUS(status) != 0){

1678

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

1679

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

1680

WEXITSTATUS(status));

1681

continue;

1682

}

1683

} else if(WIFSIGNALED(status)){

1684

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

1685

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

1686

WTERMSIG(status));

1687

continue;

1688

} else {

1689

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

1690

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

1691

continue;

1692

}

1693

}

1694

if(debug){

1695

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

1696

direntry->d_name);

1697

}

1698

}

1699

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

1700

perror_plus("close");

1701

} else {

1702

hookdir_fd = -1;

1703

}

1704

close(devnull);

1705

}

1706

1707

__attribute__((nonnull, warn_unused_result))

1708

error_t bring_up_interface(const char *const interface,

1709

const float delay){

1710

error_t old_errno = errno;

1711

int ret;

1712

struct ifreq network;

1713

unsigned int if_index = if_nametoindex(interface);

1714

if(if_index == 0){

1715

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

1716

errno = old_errno;

1717

return ENXIO;

1718

}

1719

1720

if(quit_now){

1721

errno = old_errno;

1722

return EINTR;

1723

}

1724

1725

if(not interface_is_up(interface)){

1726

error_t ret_errno = 0, ioctl_errno = 0;

1727

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

1728

ret_errno = errno;

1729

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

1730

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

1731

errno = old_errno;

1732

return ret_errno;

1733

}

1734

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

1735

1736

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

1737

if(sd == -1){

1738

ret_errno = errno;

1739

perror_plus("socket");

1740

errno = old_errno;

1741

return ret_errno;

1742

}

1743

1744

if(quit_now){

1745

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

1746

if(ret == -1){

1747

perror_plus("close");

1748

}

1749

errno = old_errno;

1750

return EINTR;

1751

}

1752

1753

if(debug){

1754

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

1755

interface);

1756

}

1757

1758

/* Raise privileges */

1759

ret_errno = raise_privileges();

1760

if(ret_errno != 0){

1761

perror_plus("Failed to raise privileges");

1762

}

1763

1764

#ifdef __linux__

1765

int ret_linux;

1766

bool restore_loglevel = false;

1767

if(ret_errno == 0){

1768

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1769

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

1770

ret_linux = klogctl(8, NULL, 5);

1771

if(ret_linux == -1){

1772

perror_plus("klogctl");

1773

} else {

1774

restore_loglevel = true;

1775

}

1776

}

1777

#endif /* __linux__ */

1778

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

1779

ioctl_errno = errno;

1780

#ifdef __linux__

1781

if(restore_loglevel){

1782

ret_linux = klogctl(7, NULL, 0);

1783

if(ret_linux == -1){

1784

perror_plus("klogctl");

1785

}

1786

}

1787

#endif /* __linux__ */

1788

1789

/* If raise_privileges() succeeded above */

1790

if(ret_errno == 0){

1791

/* Lower privileges */

1792

ret_errno = lower_privileges();

1793

if(ret_errno != 0){

1794

errno = ret_errno;

1795

perror_plus("Failed to lower privileges");

1796

}

1797

}

1798

1799

/* Close the socket */

1800

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

1801

if(ret == -1){

1802

perror_plus("close");

1803

}

1804

1805

if(ret_setflags == -1){

1806

errno = ioctl_errno;

1807

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1808

errno = old_errno;

1809

return ioctl_errno;

1810

}

1811

} else if(debug){

1812

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

1813

interface);

1814

}

1815

1816

/* Sleep checking until interface is running.

1817

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

1818

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

1819

if(interface_is_running(interface)){

1820

break;

1821

}

1822

struct timespec sleeptime = { .tv_nsec = 250000000 };

1823

ret = nanosleep(&sleeptime, NULL);

1824

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

1825

perror_plus("nanosleep");

1826

}

1827

}

1828

1829

errno = old_errno;

1830

return 0;

1831

}

1832

1833

__attribute__((nonnull, warn_unused_result))

1834

error_t take_down_interface(const char *const interface){

1835

error_t old_errno = errno;

1836

struct ifreq network;

1837

unsigned int if_index = if_nametoindex(interface);

1838

if(if_index == 0){

1839

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

1840

errno = old_errno;

1841

return ENXIO;

1842

}

1843

if(interface_is_up(interface)){

1844

error_t ret_errno = 0, ioctl_errno = 0;

1845

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

1846

ret_errno = errno;

1847

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

1848

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

1849

errno = old_errno;

1850

return ret_errno;

1851

}

1852

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

1853

1854

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

1855

if(sd == -1){

1856

ret_errno = errno;

1857

perror_plus("socket");

1858

errno = old_errno;

1859

return ret_errno;

1860

}

1861

1862

if(debug){

1863

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

1864

interface);

1865

}

1866

1867

/* Raise privileges */

1868

ret_errno = raise_privileges();

1869

if(ret_errno != 0){

1870

perror_plus("Failed to raise privileges");

1871

}

1872

1873

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

1874

ioctl_errno = errno;

1875

1876

/* If raise_privileges() succeeded above */

1877

if(ret_errno == 0){

1878

/* Lower privileges */

1879

ret_errno = lower_privileges();

1880

if(ret_errno != 0){

1881

errno = ret_errno;

1882

perror_plus("Failed to lower privileges");

1883

}

1884

}

1885

1886

/* Close the socket */

1887

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

1888

if(ret == -1){

1889

perror_plus("close");

1890

}

1891

1892

if(ret_setflags == -1){

1893

errno = ioctl_errno;

1894

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1895

errno = old_errno;

1896

return ioctl_errno;

1897

}

1898

} else if(debug){

1899

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

1900

interface);

1901

}

1902

1903

errno = old_errno;

1904

return 0;

1509

1905

}

1510

1906

1511

1907

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

1908

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

1909

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

1910

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

1911

.interfaces = NULL, .interfaces_size = 0 };

1512

1912

AvahiSServiceBrowser *sb = NULL;

1513

int error;

1913

error_t ret_errno;

1514

1914

int ret;

1515

1915

intmax_t tmpmax;

1516

1916

char *tmp;

1517

1917

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;

1918

char *interfaces_to_take_down = NULL;

1919

size_t interfaces_to_take_down_size = 0;

1920

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

1921

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

1922

char *tempdir = NULL;

1526

1923

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1527

1924

const char *seckey = PATHDIR "/" SECKEY;

1528

1925

const char *pubkey = PATHDIR "/" PUBKEY;

1926

char *interfaces_hooks = NULL;

1529

1927

1530

1928

bool gnutls_initialized = false;

1531

1929

bool gpgme_initialized = false;

1593

1991

.group = 2 },

1594

1992

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

1595

1993

.arg = "SECONDS",

1596

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

1994

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

1597

1995

.group = 2 },

1598

1996

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

1599

1997

.arg = "DIR",

1622

2020

connect_to = arg;

1623

2021

break;

1624

2022

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

1625

interface = arg;

2023

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

2024

arg, (int)',');

2025

if(ret_errno != 0){

2026

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

2027

}

1626

2028

break;

1627

2029

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

1628

2030

seckey = arg;

1671

2073

argp_state_help(state, state->out_stream,

1672

2074

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

2075

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

2076

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

1677

2077

exit(argp_err_exit_status);

1678

2078

break;

1707

2107

/* Work around Debian bug #633582:

1708

2108

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

1709

2109

1710

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

2110

/* Re-raise privileges */

2111

ret_errno = raise_privileges();

2112

if(ret_errno != 0){

2113

errno = ret_errno;

2114

perror_plus("Failed to raise privileges");

1715

2115

} else {

1716

2116

struct stat st;

1717

2117

1758

2158

}

1759

2159

1760

2160

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

2161

ret_errno = lower_privileges();

2162

if(ret_errno != 0){

2163

errno = ret_errno;

2164

perror_plus("Failed to lower privileges");

2165

}

2166

}

2167

}

2168

2169

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

2170

{

2171

char *interface = NULL;

2172

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

2173

interface))){

2174

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

2175

and if_nametoindex(interface) == 0){

2176

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

2177

fprintf_plus(stderr, "Not using nonexisting interface"

2178

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

2179

}

2180

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

2181

interface = NULL;

1765

2182

}

1766

2183

}

1767

2184

}

1768

2185

1769

2186

/* Run network hooks */

1770

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

1771

goto end;

2187

{

2188

if(mc.interfaces != NULL){

2189

interfaces_hooks = malloc(mc.interfaces_size);

2190

if(interfaces_hooks == NULL){

2191

perror_plus("malloc");

2192

goto end;

2193

}

2194

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

2195

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

2196

}

2197

run_network_hooks("start", interfaces_hooks != NULL ?

2198

interfaces_hooks : "", delay);

1772

2199

}

1773

2200

1774

2201

if(not debug){

1775

2202

avahi_set_log_function(empty_log);

1776

2203

}

1777

2204

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

2205

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

1811

2206

from the signal handler */

1812

2207

/* Initialize the pseudo-RNG for Avahi */

1813

2208

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

1814

mc.simple_poll = avahi_simple_poll_new();

1815

if(mc.simple_poll == NULL){

2209

simple_poll = avahi_simple_poll_new();

2210

if(simple_poll == NULL){

1816

2211

fprintf_plus(stderr,

1817

2212

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

1818

2213

exitcode = EX_UNAVAILABLE;

1882

2277

}

1883

2278

}

1884

2279

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");

2280

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

2281

if(mc.interfaces == NULL){

2282

struct dirent **direntries;

2283

/* Look for any good interfaces */

2284

ret = scandir(sys_class_net, &direntries, good_interface,

2285

alphasort);

2286

if(ret >= 1){

2287

/* Add all found interfaces to interfaces list */

2288

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

2289

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

2290

direntries[i]->d_name);

2291

if(ret_errno != 0){

2292

errno = ret_errno;

2293

perror_plus("argz_add");

2294

continue;

2295

}

2296

if(debug){

2297

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

2298

direntries[i]->d_name);

2299

}

2300

}

2301

free(direntries);

2302

} else {

2303

free(direntries);

2304

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

2305

exitcode = EXIT_FAILURE;

2306

goto end;

2307

}

2308

}

2309

2310

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

2311

{

2312

char *interface = NULL;

2313

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

2314

interface))){

2315

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

2316

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

2317

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

2318

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

2319

interface);

2320

interface = NULL;

2321

while((interface = argz_next(mc.interfaces,

2322

mc.interfaces_size, interface))){

2323

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

2324

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

2325

interface);

2326

interface = NULL;

1970

2327

}

1971

2328

}

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

2329

break;

1990

2330

}

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

}

2331

bool interface_was_up = interface_is_up(interface);

2332

errno = bring_up_interface(interface, delay);

2333

if(not interface_was_up){

2334

if(errno != 0){

2335

perror_plus("Failed to bring up interface");

2336

} else {

2337

errno = argz_add(&interfaces_to_take_down,

2338

&interfaces_to_take_down_size,

2339

interface);

2340

if(errno != 0){

2341

perror_plus("argz_add");

2342

}

2343

}

2344

}

2345

}

2346

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

2347

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

2348

}

2349

}

2350

2351

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

2352

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

2353

if(debug){

2354

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

2355

mc.interfaces);

2356

}

2357

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

2020

2358

}

2021

2359

2022

2360

if(quit_now){

2023

2361

goto end;

2024

2362

}

2025

2363

2026

ret = init_gnutls_global(pubkey, seckey);

2364

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

2027

2365

if(ret == -1){

2028

2366

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

2029

2367

exitcode = EX_UNAVAILABLE;

2036

2374

goto end;

2037

2375

}

2038

2376

2039

if(mkdtemp(tempdir) == NULL){

2377

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

2378

tempdir = mkdtemp(run_tempdir);

2379

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

2380

if(debug){

2381

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

2382

run_tempdir, old_tempdir);

2383

}

2384

tempdir = mkdtemp(old_tempdir);

2385

}

2386

if(tempdir == NULL){

2040

2387

perror_plus("mkdtemp");

2041

2388

goto end;

2042

2389

}

2043

tempdir_created = true;

2044

2390

2045

2391

if(quit_now){

2046

2392

goto end;

2047

2393

}

2048

2394

2049

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

2395

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

2050

2396

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

2051

2397

exitcode = EX_UNAVAILABLE;

2052

2398

goto end;

2062

2408

/* Connect directly, do not use Zeroconf */

2063

2409

/* (Mainly meant for debugging) */

2064

2410

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

2411

2065

2412

if(address == NULL){

2066

2413

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

2067

2414

exitcode = EX_USAGE;

2072

2419

goto end;

2073

2420

}

2074

2421

2075

uint16_t port;

2422

in_port_t port;

2076

2423

errno = 0;

2077

2424

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

2078

2425

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

2079

or tmpmax != (uint16_t)tmpmax){

2426

or tmpmax != (in_port_t)tmpmax){

2080

2427

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

2081

2428

exitcode = EX_USAGE;

2082

2429

goto end;

2083

2430

}

2084

2431

2085

2432

if(quit_now){

2086

2433

goto end;

2087

2434

}

2088

2435

2089

port = (uint16_t)tmpmax;

2436

port = (in_port_t)tmpmax;

2090

2437

*address = '\0';

2091

2438

/* Colon in address indicates IPv6 */

2092

2439

int af;

2108

2455

}

2109

2456

2110

2457

while(not quit_now){

2111

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

2458

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

2459

&mc);

2112

2460

if(quit_now or ret == 0){

2113

2461

break;

2114

2462

}

2116

2464

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

2117

2465

(int)retry_interval);

2118

2466

}

2119

sleep((int)retry_interval);

2467

sleep((unsigned int)retry_interval);

2120

2468

}

2121

2469

2122

if (not quit_now){

2470

if(not quit_now){

2123

2471

exitcode = EXIT_SUCCESS;

2124

2472

}

2125

2473

2140

2488

config.publish_domain = 0;

2141

2489

2142

2490

/* Allocate a new server */

2143

mc.server = avahi_server_new(avahi_simple_poll_get

2144

(mc.simple_poll), &config, NULL,

2145

NULL, &error);

2491

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2492

&config, NULL, NULL, &ret_errno);

2146

2493

2147

2494

/* Free the Avahi configuration data */

2148

2495

avahi_server_config_free(&config);

2151

2498

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

2152

2499

if(mc.server == NULL){

2153

2500

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

2154

avahi_strerror(error));

2501

avahi_strerror(ret_errno));

2155

2502

exitcode = EX_UNAVAILABLE;

2156

2503

goto end;

2157

2504

}

2163

2510

/* Create the Avahi service browser */

2164

2511

sb = avahi_s_service_browser_new(mc.server, if_index,

2165

2512

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2166

NULL, 0, browse_callback, NULL);

2513

NULL, 0, browse_callback,

2514

(void *)&mc);

2167

2515

if(sb == NULL){

2168

2516

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

2169

2517

avahi_strerror(avahi_server_errno(mc.server)));

2180

2528

if(debug){

2181

2529

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

2182

2530

}

2183

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2531

2532

ret = avahi_loop_with_timeout(simple_poll,

2533

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

2186

2534

if(debug){

2187

2535

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

2188

2536

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

2195

2543

}

2196

2544

2197

2545

/* Cleanup things */

2546

free(mc.interfaces);

2547

2198

2548

if(sb != NULL)

2199

2549

avahi_s_service_browser_free(sb);

2200

2550

2201

2551

if(mc.server != NULL)

2202

2552

avahi_server_free(mc.server);

2203

2553

2204

if(mc.simple_poll != NULL)

2205

avahi_simple_poll_free(mc.simple_poll);

2554

if(simple_poll != NULL)

2555

avahi_simple_poll_free(simple_poll);

2206

2556

2207

2557

if(gnutls_initialized){

2208

2558

gnutls_certificate_free_credentials(mc.cred);

2225

2575

}

2226

2576

}

2227

2577

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

2578

/* Re-raise privileges */

2232

2579

{

2233

errno = 0;

2234

ret = seteuid(0);

2235

if(ret == -1){

2236

perror_plus("seteuid");

2580

ret_errno = raise_privileges();

2581

if(ret_errno != 0){

2582

perror_plus("Failed to raise privileges");

2583

} else {

2584

2585

/* Run network hooks */

2586

run_network_hooks("stop", interfaces_hooks != NULL ?

2587

interfaces_hooks : "", delay);

2588

2589

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

2590

{

2591

char *interface = NULL;

2592

while((interface=argz_next(interfaces_to_take_down,

2593

interfaces_to_take_down_size,

2594

interface))){

2595

ret_errno = take_down_interface(interface);

2596

if(ret_errno != 0){

2597

errno = ret_errno;

2598

perror_plus("Failed to take down interface");

2599

}

2600

}

2601

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

2602

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

2603

" down\n");

2604

}

2605

}

2237

2606

}

2238

2607

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

}

2608

ret_errno = lower_privileges_permanently();

2609

if(ret_errno != 0){

2610

perror_plus("Failed to lower privileges permanently");

2255

2611

}

2256

2612

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2613

2614

free(interfaces_to_take_down);

2615

free(interfaces_hooks);

2263

2616

2264

2617

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

2265

if(tempdir_created){

2618

if(tempdir != NULL){

2266

2619

struct dirent **direntries = NULL;

2267

2620

struct dirent *direntry = NULL;

2268

2621

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

2269

2622

alphasort);

2270

if (numentries > 0){

2623

if(numentries > 0){

2271

2624

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

2272

2625

direntry = direntries[i];

2273

2626

char *fullname = NULL;

2285

2638

free(fullname);

2286

2639

}

2287

2640

}

2288

2641

2289

2642

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

2290

2643

free(direntries);

2291

if (numentries == -1){

2644

if(numentries == -1){

2292

2645

perror_plus("scandir");

2293

2646

}

2294

2647

ret = rmdir(tempdir);