/mandos/trunk : revision 707

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

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

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40

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

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

43

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 */

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

47

strtof(), abort() */

55

opendir(), DIR */

56

#include <sys/stat.h> /* open(), S_ISREG */

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#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() */

60

61

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

61

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 */

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#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() */

77

#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

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argp_state, struct argp,

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89

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

89

90

WEXITSTATUS(), WTERMSIG() */

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91

#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(),

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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

return false;

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

220

243

}

221

244

/* Special case of first server */

222

if (mc.current_server == NULL){

245

if(*current_server == NULL){

223

246

new_server->next = new_server;

224

247

new_server->prev = new_server;

225

mc.current_server = new_server;

226

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

248

*current_server = new_server;

227

249

} else {

228

new_server->next = mc.current_server;

229

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

250

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

251

new_server->next = *current_server;

252

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

230

253

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;

254

(*current_server)->prev = new_server;

255

}

256

return true;

239

257

}

240

258

241

259

/*

242

260

* Initialize GPGME.

243

261

*/

244

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

245

const char *tempdir){

262

__attribute__((nonnull, warn_unused_result))

263

static bool init_gpgme(const char * const seckey,

264

const char * const pubkey,

265

const char * const tempdir,

266

mandos_context *mc){

246

267

gpgme_error_t rc;

247

268

gpgme_engine_info_t engine_info;

248

269

249

250

270

/*

251

271

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

252

272

*/

253

bool import_key(const char *filename){

273

bool import_key(const char * const filename){

254

274

int ret;

255

275

int fd;

256

276

gpgme_data_t pgp_data;

268

288

return false;

269

289

}

270

290

271

rc = gpgme_op_import(mc.ctx, pgp_data);

291

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

272

292

if(rc != GPG_ERR_NO_ERROR){

273

293

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

274

294

gpgme_strsource(rc), gpgme_strerror(rc));

318

338

}

319

339

320

340

/* Create new GPGME "context" */

321

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

341

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

322

342

if(rc != GPG_ERR_NO_ERROR){

323

343

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

324

344

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

337

357

* Decrypt OpenPGP data.

338

358

* Returns -1 on error

339

359

*/

360

__attribute__((nonnull, warn_unused_result))

340

361

static ssize_t pgp_packet_decrypt(const char *cryptotext,

341

362

size_t crypto_size,

342

char **plaintext){

363

char **plaintext,

364

mandos_context *mc){

343

365

gpgme_data_t dh_crypto, dh_plain;

344

366

gpgme_error_t rc;

345

367

ssize_t ret;

371

393

372

394

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

373

395

data buffer */

374

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

396

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

375

397

if(rc != GPG_ERR_NO_ERROR){

376

398

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

377

399

gpgme_strsource(rc), gpgme_strerror(rc));

378

400

plaintext_length = -1;

379

401

if(debug){

380

402

gpgme_decrypt_result_t result;

381

result = gpgme_op_decrypt_result(mc.ctx);

403

result = gpgme_op_decrypt_result(mc->ctx);

382

404

if(result == NULL){

383

405

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

384

406

} else {

461

483

return plaintext_length;

462

484

}

463

485

464

static const char * safer_gnutls_strerror(int value){

465

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

466

-Wunreachable-code */

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

const char *ret = gnutls_strerror(value);

467

489

if(ret == NULL)

468

490

ret = "(unknown)";

469

491

return ret;

470

492

}

471

493

472

494

/* GnuTLS log function callback */

495

__attribute__((nonnull))

473

496

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

474

497

const char* string){

475

498

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

476

499

}

477

500

501

__attribute__((nonnull, warn_unused_result))

478

502

static int init_gnutls_global(const char *pubkeyfilename,

479

const char *seckeyfilename){

503

const char *seckeyfilename,

504

mandos_context *mc){

480

505

int ret;

481

506

482

507

if(debug){

499

524

}

500

525

501

526

/* OpenPGP credentials */

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

503

528

if(ret != GNUTLS_E_SUCCESS){

504

529

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

505

530

safer_gnutls_strerror(ret));

515

540

}

516

541

517

542

ret = gnutls_certificate_set_openpgp_key_file

518

(mc.cred, pubkeyfilename, seckeyfilename,

543

(mc->cred, pubkeyfilename, seckeyfilename,

519

544

GNUTLS_OPENPGP_FMT_BASE64);

520

545

if(ret != GNUTLS_E_SUCCESS){

521

546

fprintf_plus(stderr,

527

552

}

528

553

529

554

/* GnuTLS server initialization */

530

ret = gnutls_dh_params_init(&mc.dh_params);

555

ret = gnutls_dh_params_init(&mc->dh_params);

531

556

if(ret != GNUTLS_E_SUCCESS){

532

557

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

558

" initialization: %s\n",

534

559

safer_gnutls_strerror(ret));

535

560

goto globalfail;

536

561

}

537

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

562

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

538

563

if(ret != GNUTLS_E_SUCCESS){

539

564

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

540

565

safer_gnutls_strerror(ret));

541

566

goto globalfail;

542

567

}

543

568

544

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

569

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

545

570

546

571

return 0;

547

572

548

573

globalfail:

549

574

550

gnutls_certificate_free_credentials(mc.cred);

575

gnutls_certificate_free_credentials(mc->cred);

551

576

gnutls_global_deinit();

552

gnutls_dh_params_deinit(mc.dh_params);

577

gnutls_dh_params_deinit(mc->dh_params);

553

578

return -1;

554

579

}

555

580

556

static int init_gnutls_session(gnutls_session_t *session){

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

557

584

int ret;

558

585

/* GnuTLS session creation */

559

586

do {

571

598

{

572

599

const char *err;

573

600

do {

574

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

601

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

575

602

if(quit_now){

576

603

gnutls_deinit(*session);

577

604

return -1;

588

615

589

616

do {

590

617

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

591

mc.cred);

618

mc->cred);

592

619

if(quit_now){

593

620

gnutls_deinit(*session);

594

621

return -1;

604

631

/* ignore client certificate if any. */

605

632

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

606

633

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

608

635

609

636

return 0;

610

637

}

614

641

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

615

642

616

643

/* Called when a Mandos server is found */

617

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

644

__attribute__((nonnull, warn_unused_result))

645

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

618

646

AvahiIfIndex if_index,

619

int af){

647

int af, mandos_context *mc){

620

648

int ret, tcp_sd = -1;

621

649

ssize_t sret;

622

union {

623

struct sockaddr_in in;

624

struct sockaddr_in6 in6;

625

} to;

650

struct sockaddr_storage to;

626

651

char *buffer = NULL;

627

652

char *decrypted_buffer = NULL;

628

653

size_t buffer_length = 0;

652

677

return -1;

653

678

}

654

679

655

ret = init_gnutls_session(&session);

680

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

681

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

682

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

683

bool match = false;

684

{

685

char *interface = NULL;

686

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

687

interface))){

688

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

689

match = true;

690

break;

691

}

692

}

693

}

694

if(not match){

695

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

696

connect to the server */

697

if(debug){

698

char interface[IF_NAMESIZE];

699

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

700

perror_plus("if_indextoname");

701

} else {

702

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

703

" \"%s\"\n",

704

if_indextoname((unsigned int)if_index,

705

interface));

706

}

707

}

708

return -1;

709

}

710

}

711

712

ret = init_gnutls_session(&session, mc);

656

713

if(ret != 0){

657

714

return -1;

658

715

}

659

716

660

717

if(debug){

661

718

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

662

PRIu16 "\n", ip, port);

719

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

663

720

}

664

721

665

722

tcp_sd = socket(pf, SOCK_STREAM, 0);

677

734

678

735

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

679

736

if(af == AF_INET6){

680

to.in6.sin6_family = (sa_family_t)af;

681

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

737

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

738

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

682

739

} else { /* IPv4 */

683

to.in.sin_family = (sa_family_t)af;

684

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

740

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

741

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

685

742

}

686

743

if(ret < 0 ){

687

744

int e = errno;

696

753

goto mandos_end;

697

754

}

698

755

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*/

756

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

757

if(IN6_IS_ADDR_LINKLOCAL

758

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

706

759

if(if_index == AVAHI_IF_UNSPEC){

707

760

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

708

761

" incomplete without a network interface\n");

710

763

goto mandos_end;

711

764

}

712

765

/* Set the network interface number as scope */

713

to.in6.sin6_scope_id = (uint32_t)if_index;

766

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

714

767

}

715

768

} else {

716

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

717

-Wconversion and

718

-Wunreachable-code */

769

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

719

770

}

720

771

721

772

if(quit_now){

729

780

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

730

781

perror_plus("if_indextoname");

731

782

} else {

732

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

733

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

783

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

784

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

734

785

}

735

786

} else {

736

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

737

ip, port);

787

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

788

ip, (uintmax_t)port);

738

789

}

739

790

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

791

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

741

const char *pcret;

742

792

if(af == AF_INET6){

743

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

744

sizeof(addrstr));

793

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

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

745

797

} else {

746

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

747

sizeof(addrstr));

798

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

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

748

802

}

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

}

803

if(ret == EAI_SYSTEM){

804

perror_plus("getnameinfo");

805

} else if(ret != 0) {

806

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

807

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

808

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

755

809

}

756

810

}

757

811

761

815

}

762

816

763

817

if(af == AF_INET6){

764

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

818

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

819

sizeof(struct sockaddr_in6));

765

820

} else {

766

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

821

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

822

sizeof(struct sockaddr_in));

767

823

}

768

824

if(ret < 0){

769

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

825

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

770

826

int e = errno;

771

827

perror_plus("connect");

772

828

errno = e;

818

874

goto mandos_end;

819

875

}

820

876

821

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

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

877

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

878

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

879

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

880

gnutls_transport_set_ptr(session,

881

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

823

882

824

883

if(quit_now){

825

884

errno = EINTR;

930

989

if(buffer_length > 0){

931

990

ssize_t decrypted_buffer_size;

932

991

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

933

&decrypted_buffer);

992

&decrypted_buffer, mc);

934

993

if(decrypted_buffer_size >= 0){

935

994

936

995

written = 0;

984

1043

return retval;

985

1044

}

986

1045

1046

__attribute__((nonnull))

987

1047

static void resolve_callback(AvahiSServiceResolver *r,

988

1048

AvahiIfIndex interface,

989

1049

AvahiProtocol proto,

997

1057

AVAHI_GCC_UNUSED AvahiStringList *txt,

998

1058

AVAHI_GCC_UNUSED AvahiLookupResultFlags

999

1059

flags,

1000

AVAHI_GCC_UNUSED void* userdata){

1001

assert(r);

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

1002

1064

1003

1065

/* Called whenever a service has been resolved successfully or

1004

1066

timed out */

1013

1075

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

1014

1076

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

1015

1077

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

1078

avahi_strerror(avahi_server_errno

1079

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

1017

1080

break;

1018

1081

1019

1082

case AVAHI_RESOLVER_FOUND:

1025

1088

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

1026

1089

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

1027

1090

}

1028

int ret = start_mandos_communication(ip, port, interface,

1029

avahi_proto_to_af(proto));

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

1030

1095

if(ret == 0){

1031

avahi_simple_poll_quit(mc.simple_poll);

1096

avahi_simple_poll_quit(simple_poll);

1032

1097

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

1098

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

1099

avahi_proto_to_af(proto),

1100

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

1101

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

1102

" list\n", name);

1103

}

1035

1104

}

1036

1105

}

1037

1106

}

1047

1116

const char *domain,

1048

1117

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1049

1118

flags,

1050

AVAHI_GCC_UNUSED void* userdata){

1051

assert(b);

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

1052

1123

1053

1124

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

1054

1125

is removed from the LAN */

1062

1133

case AVAHI_BROWSER_FAILURE:

1063

1134

1064

1135

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

1066

avahi_simple_poll_quit(mc.simple_poll);

1136

avahi_strerror(avahi_server_errno

1137

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

1138

avahi_simple_poll_quit(simple_poll);

1067

1139

return;

1068

1140

1069

1141

case AVAHI_BROWSER_NEW:

1072

1144

the callback function is called the Avahi server will free the

1073

1145

resolver for us. */

1074

1146

1075

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

1076

name, type, domain, protocol, 0,

1077

resolve_callback, NULL) == NULL)

1147

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

1148

interface, protocol, name, type,

1149

domain, protocol, 0,

1150

resolve_callback, mc) == NULL)

1078

1151

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

1079

1152

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

1153

avahi_strerror(avahi_server_errno

1154

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

1081

1155

break;

1082

1156

1083

1157

case AVAHI_BROWSER_REMOVE:

1102

1176

signal_received = sig;

1103

1177

int old_errno = errno;

1104

1178

/* set main loop to exit */

1105

if(mc.simple_poll != NULL){

1106

avahi_simple_poll_quit(mc.simple_poll);

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1107

1181

}

1108

1182

errno = old_errno;

1109

1183

}

1110

1184

1185

__attribute__((nonnull, warn_unused_result))

1111

1186

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

1112

1187

int ret;

1188

error_t ret_errno;

1113

1189

1114

1190

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

1115

1191

if(s < 0){

1192

ret_errno = errno;

1116

1193

perror_plus("socket");

1194

errno = ret_errno;

1117

1195

return false;

1118

1196

}

1119

1197

strcpy(ifr->ifr_name, ifname);

1120

1198

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

1199

if(ret == -1){

1122

1200

if(debug){

1201

ret_errno = errno;

1123

1202

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1124

1204

}

1125

1205

return false;

1126

1206

}

1127

1207

return true;

1128

1208

}

1129

1209

1210

__attribute__((nonnull, warn_unused_result))

1130

1211

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

1131

1212

1132

1213

/* Reject the loopback device */

1174

1255

* corresponds to an acceptable network device.

1175

1256

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

1176

1257

*/

1258

__attribute__((nonnull, warn_unused_result))

1177

1259

int good_interface(const struct dirent *if_entry){

1178

1260

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

1179

1261

return 0;

1195

1277

}

1196

1278

1197

1279

/*

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

1280

* This function determines if a network interface is up.

1281

*/

1282

__attribute__((nonnull, warn_unused_result))

1283

bool interface_is_up(const char *interface){

1284

struct ifreq ifr;

1285

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

1286

if(debug){

1287

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

1288

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

1289

}

1290

return false;

1291

}

1292

1293

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

1294

}

1295

1296

/*

1297

* This function determines if a network interface is running

1298

*/

1299

__attribute__((nonnull, warn_unused_result))

1300

bool interface_is_running(const char *interface){

1301

struct ifreq ifr;

1302

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

1303

if(debug){

1304

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

1305

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

1306

}

1307

return false;

1308

}

1309

1310

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

1311

}

1312

1313

__attribute__((nonnull, pure, warn_unused_result))

1240

1314

int notdotentries(const struct dirent *direntry){

1241

1315

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

1242

1316

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

1249

1323

}

1250

1324

1251

1325

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

1326

__attribute__((nonnull, warn_unused_result))

1252

1327

int runnable_hook(const struct dirent *direntry){

1253

1328

int ret;

1254

1329

size_t sret;

1262

1337

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

1263

1338

"abcdefghijklmnopqrstuvwxyz"

1264

1339

"0123456789"

1265

"_-");

1340

"_.-");

1266

1341

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

1267

1342

/* Contains non-allowed characters */

1268

1343

if(debug){

1272

1347

return 0;

1273

1348

}

1274

1349

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);

1350

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

1283

1351

if(ret == -1){

1284

1352

if(debug){

1285

1353

perror_plus("Could not stat hook");

1309

1377

return 1;

1310

1378

}

1311

1379

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1313

1383

int ret;

1314

1384

struct timespec now;

1315

1385

struct timespec waited_time;

1316

1386

intmax_t block_time;

1317

1387

1318

1388

while(true){

1319

if(mc.current_server == NULL){

1320

if (debug){

1389

if(mc->current_server == NULL){

1390

if(debug){

1321

1391

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

1322

1392

" No timeout!\n");

1323

1393

}

1324

1394

ret = avahi_simple_poll_iterate(s, -1);

1325

1395

} else {

1326

if (debug){

1396

if(debug){

1327

1397

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

1328

1398

" it, or wait\n");

1329

1399

}

1336

1406

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

1337

1407

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

1338

1408

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1409

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

1340

1410

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1411

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

1342

1412

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

1343

1413

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

1344

1414

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

1346

1416

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

1347

1417

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

1348

1418

1349

if (debug){

1419

if(debug){

1350

1420

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

1351

1421

block_time);

1352

1422

}

1353

1423

1354

1424

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);

1425

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

1426

mc->current_server->port,

1427

mc->current_server->if_index,

1428

mc->current_server->af, mc);

1359

1429

if(ret == 0){

1360

avahi_simple_poll_quit(mc.simple_poll);

1430

avahi_simple_poll_quit(s);

1361

1431

return 0;

1362

1432

}

1363

1433

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1434

&mc->current_server->last_seen);

1365

1435

if(ret == -1){

1366

1436

perror_plus("clock_gettime");

1367

1437

return -1;

1368

1438

}

1369

mc.current_server = mc.current_server->next;

1439

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

1370

1440

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

1371

1441

servers, but don't block */

1372

1442

}

1374

1444

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

1375

1445

}

1376

1446

if(ret != 0){

1377

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

1447

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

1378

1448

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

1379

1449

}

1380

1450

}

1381

1451

}

1382

1452

}

1383

1453

1384

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

1454

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

1455

__attribute__((warn_unused_result))

1456

error_t raise_privileges(void){

1457

error_t old_errno = errno;

1458

error_t ret_errno = 0;

1459

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

1460

ret_errno = errno;

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

}

1478

errno = old_errno;

1479

return ret_errno;

1480

}

1481

1482

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

1483

__attribute__((warn_unused_result))

1484

error_t lower_privileges(void){

1485

error_t old_errno = errno;

1486

error_t ret_errno = 0;

1487

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

1488

ret_errno = errno;

1489

}

1490

errno = old_errno;

1491

return ret_errno;

1492

}

1493

1494

/* Lower privileges permanently */

1495

__attribute__((warn_unused_result))

1496

error_t lower_privileges_permanently(void){

1497

error_t old_errno = errno;

1498

error_t ret_errno = 0;

1499

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

1500

ret_errno = errno;

1501

}

1502

errno = old_errno;

1503

return ret_errno;

1504

}

1505

1506

__attribute__((nonnull))

1507

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

1385

1508

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1509

struct dirent **direntries = NULL;

1510

if(hookdir_fd == -1){

1511

hookdir_fd = open(hookdir, O_RDONLY);

1512

if(hookdir_fd == -1){

1513

if(errno == ENOENT){

1514

if(debug){

1515

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

1516

" found\n", hookdir);

1517

}

1518

} else {

1519

perror_plus("open");

1520

}

1521

return;

1522

}

1523

}

1524

#ifdef __GLIBC__

1525

#if __GLIBC_PREREQ(2, 15)

1526

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

1527

runnable_hook, alphasort);

1528

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

1529

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

1530

alphasort);

1531

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

1532

#else /* not __GLIBC__ */

1533

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

1534

alphasort);

1535

#endif /* not __GLIBC__ */

1391

1536

if(numhooks == -1){

1392

1537

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){

1538

return;

1539

}

1540

struct dirent *direntry;

1541

int ret;

1542

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

1543

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

1544

direntry = direntries[i];

1545

if(debug){

1546

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

1547

direntry->d_name);

1548

}

1549

pid_t hook_pid = fork();

1550

if(hook_pid == 0){

1551

/* Child */

1552

/* Raise privileges */

1553

errno = raise_privileges_permanently();

1554

if(errno != 0){

1555

perror_plus("Failed to raise privileges");

1556

_exit(EX_NOPERM);

1557

}

1558

/* Set group */

1559

errno = 0;

1560

ret = setgid(0);

1561

if(ret == -1){

1562

perror_plus("setgid");

1563

_exit(EX_NOPERM);

1564

}

1565

/* Reset supplementary groups */

1566

errno = 0;

1567

ret = setgroups(0, NULL);

1568

if(ret == -1){

1569

perror_plus("setgroups");

1570

_exit(EX_NOPERM);

1571

}

1572

ret = dup2(devnull, STDIN_FILENO);

1573

if(ret == -1){

1574

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

1575

_exit(EX_OSERR);

1576

}

1577

ret = close(devnull);

1578

if(ret == -1){

1579

perror_plus("close");

1580

_exit(EX_OSERR);

1581

}

1582

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1583

if(ret == -1){

1584

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

1585

_exit(EX_OSERR);

1586

}

1587

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

1588

if(ret == -1){

1589

perror_plus("setenv");

1590

_exit(EX_OSERR);

1591

}

1592

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

1593

if(ret == -1){

1594

perror_plus("setenv");

1595

_exit(EX_OSERR);

1596

}

1597

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

1598

if(ret == -1){

1599

perror_plus("setenv");

1600

_exit(EX_OSERR);

1601

}

1602

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

1603

if(ret == -1){

1604

perror_plus("setenv");

1605

_exit(EX_OSERR);

1606

}

1607

char *delaystring;

1608

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

1609

if(ret == -1){

1400

1610

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

}

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1469

1615

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;

1616

perror_plus("setenv");

1617

_exit(EX_OSERR);

1618

}

1619

free(delaystring);

1620

if(connect_to != NULL){

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

_exit(EX_OSERR);

1625

}

1626

}

1627

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

1628

if(hook_fd == -1){

1629

perror_plus("openat");

1630

_exit(EXIT_FAILURE);

1631

}

1632

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

1633

perror_plus("close");

1634

_exit(EXIT_FAILURE);

1635

}

1636

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

1637

environ) == -1){

1638

perror_plus("fexecve");

1639

_exit(EXIT_FAILURE);

1640

}

1641

} else {

1642

int status;

1643

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

1644

perror_plus("waitpid");

1645

continue;

1646

}

1647

if(WIFEXITED(status)){

1648

if(WEXITSTATUS(status) != 0){

1649

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

1650

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

1651

WEXITSTATUS(status));

1652

continue;

1653

}

1654

} else if(WIFSIGNALED(status)){

1655

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

1656

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

1657

WTERMSIG(status));

1658

continue;

1659

} else {

1660

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

1661

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

1662

continue;

1663

}

1664

}

1665

if(debug){

1666

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

1667

direntry->d_name);

1668

}

1669

}

1670

free(direntries);

1671

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

1672

perror_plus("close");

1673

} else {

1674

hookdir_fd = -1;

1675

}

1676

close(devnull);

1677

}

1678

1679

__attribute__((nonnull, warn_unused_result))

1680

error_t bring_up_interface(const char *const interface,

1681

const float delay){

1682

error_t old_errno = errno;

1683

int ret;

1684

struct ifreq network;

1685

unsigned int if_index = if_nametoindex(interface);

1686

if(if_index == 0){

1687

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

1688

errno = old_errno;

1689

return ENXIO;

1690

}

1691

1692

if(quit_now){

1693

errno = old_errno;

1694

return EINTR;

1695

}

1696

1697

if(not interface_is_up(interface)){

1698

error_t ret_errno = 0, ioctl_errno = 0;

1699

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

1700

ret_errno = errno;

1701

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

1702

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

1703

errno = old_errno;

1704

return ret_errno;

1705

}

1706

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

1707

1708

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

1709

if(sd == -1){

1710

ret_errno = errno;

1711

perror_plus("socket");

1712

errno = old_errno;

1713

return ret_errno;

1714

}

1715

1716

if(quit_now){

1717

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

1718

if(ret == -1){

1719

perror_plus("close");

1720

}

1721

errno = old_errno;

1722

return EINTR;

1723

}

1724

1725

if(debug){

1726

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

1727

interface);

1728

}

1729

1730

/* Raise privileges */

1731

ret_errno = raise_privileges();

1732

if(ret_errno != 0){

1733

errno = ret_errno;

1734

perror_plus("Failed to raise privileges");

1735

}

1736

1737

#ifdef __linux__

1738

int ret_linux;

1739

bool restore_loglevel = false;

1740

if(ret_errno == 0){

1741

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1742

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

1743

ret_linux = klogctl(8, NULL, 5);

1744

if(ret_linux == -1){

1745

perror_plus("klogctl");

1746

} else {

1747

restore_loglevel = true;

1748

}

1749

}

1750

#endif /* __linux__ */

1751

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

1752

ioctl_errno = errno;

1753

#ifdef __linux__

1754

if(restore_loglevel){

1755

ret_linux = klogctl(7, NULL, 0);

1756

if(ret_linux == -1){

1757

perror_plus("klogctl");

1758

}

1759

}

1760

#endif /* __linux__ */

1761

1762

/* If raise_privileges() succeeded above */

1763

if(ret_errno == 0){

1764

/* Lower privileges */

1765

ret_errno = lower_privileges();

1766

if(ret_errno != 0){

1767

errno = ret_errno;

1768

perror_plus("Failed to lower privileges");

1769

}

1770

}

1771

1772

/* Close the socket */

1773

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

1774

if(ret == -1){

1775

perror_plus("close");

1776

}

1777

1778

if(ret_setflags == -1){

1779

errno = ioctl_errno;

1780

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1781

errno = old_errno;

1782

return ioctl_errno;

1783

}

1784

} else if(debug){

1785

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

1786

interface);

1787

}

1788

1789

/* Sleep checking until interface is running.

1790

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

1791

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

1792

if(interface_is_running(interface)){

1793

break;

1794

}

1795

struct timespec sleeptime = { .tv_nsec = 250000000 };

1796

ret = nanosleep(&sleeptime, NULL);

1797

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

1798

perror_plus("nanosleep");

1799

}

1800

}

1801

1802

errno = old_errno;

1803

return 0;

1804

}

1805

1806

__attribute__((nonnull, warn_unused_result))

1807

error_t take_down_interface(const char *const interface){

1808

error_t old_errno = errno;

1809

struct ifreq network;

1810

unsigned int if_index = if_nametoindex(interface);

1811

if(if_index == 0){

1812

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

1813

errno = old_errno;

1814

return ENXIO;

1815

}

1816

if(interface_is_up(interface)){

1817

error_t ret_errno = 0, ioctl_errno = 0;

1818

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

1819

ret_errno = errno;

1820

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

1821

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

1822

errno = old_errno;

1823

return ret_errno;

1824

}

1825

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

1826

1827

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

1828

if(sd == -1){

1829

ret_errno = errno;

1830

perror_plus("socket");

1831

errno = old_errno;

1832

return ret_errno;

1833

}

1834

1835

if(debug){

1836

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

1837

interface);

1838

}

1839

1840

/* Raise privileges */

1841

ret_errno = raise_privileges();

1842

if(ret_errno != 0){

1843

errno = ret_errno;

1844

perror_plus("Failed to raise privileges");

1845

}

1846

1847

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

1848

ioctl_errno = errno;

1849

1850

/* If raise_privileges() succeeded above */

1851

if(ret_errno == 0){

1852

/* Lower privileges */

1853

ret_errno = lower_privileges();

1854

if(ret_errno != 0){

1855

errno = ret_errno;

1856

perror_plus("Failed to lower privileges");

1857

}

1858

}

1859

1860

/* Close the socket */

1861

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

1862

if(ret == -1){

1863

perror_plus("close");

1864

}

1865

1866

if(ret_setflags == -1){

1867

errno = ioctl_errno;

1868

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1869

errno = old_errno;

1870

return ioctl_errno;

1871

}

1872

} else if(debug){

1873

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

1874

interface);

1875

}

1876

1877

errno = old_errno;

1878

return 0;

1509

1879

}

1510

1880

1511

1881

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

1882

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

1883

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

1884

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

1885

.interfaces = NULL, .interfaces_size = 0 };

1512

1886

AvahiSServiceBrowser *sb = NULL;

1513

int error;

1887

error_t ret_errno;

1514

1888

int ret;

1515

1889

intmax_t tmpmax;

1516

1890

char *tmp;

1517

1891

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;

1892

char *interfaces_to_take_down = NULL;

1893

size_t interfaces_to_take_down_size = 0;

1894

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

1895

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

1896

char *tempdir = NULL;

1526

1897

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1527

1898

const char *seckey = PATHDIR "/" SECKEY;

1528

1899

const char *pubkey = PATHDIR "/" PUBKEY;

1900

char *interfaces_hooks = NULL;

1529

1901

1530

1902

bool gnutls_initialized = false;

1531

1903

bool gpgme_initialized = false;

1593

1965

.group = 2 },

1594

1966

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

1595

1967

.arg = "SECONDS",

1596

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

1968

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

1597

1969

.group = 2 },

1598

1970

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

1599

1971

.arg = "DIR",

1622

1994

connect_to = arg;

1623

1995

break;

1624

1996

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

1625

interface = arg;

1997

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

1998

arg, (int)',');

1999

if(ret_errno != 0){

2000

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

2001

}

1626

2002

break;

1627

2003

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

1628

2004

seckey = arg;

1671

2047

argp_state_help(state, state->out_stream,

1672

2048

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

2049

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

2050

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

1677

2051

exit(argp_err_exit_status);

1678

2052

break;

1707

2081

/* Work around Debian bug #633582:

1708

2082

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

1709

2083

1710

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

2084

/* Re-raise privileges */

2085

ret_errno = raise_privileges();

2086

if(ret_errno != 0){

2087

errno = ret_errno;

2088

perror_plus("Failed to raise privileges");

1715

2089

} else {

1716

2090

struct stat st;

1717

2091

1758

2132

}

1759

2133

1760

2134

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

2135

ret_errno = lower_privileges();

2136

if(ret_errno != 0){

2137

errno = ret_errno;

2138

perror_plus("Failed to lower privileges");

2139

}

2140

}

2141

}

2142

2143

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

2144

{

2145

char *interface = NULL;

2146

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

2147

interface))){

2148

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

2149

and if_nametoindex(interface) == 0){

2150

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

2151

fprintf_plus(stderr, "Not using nonexisting interface"

2152

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

2153

}

2154

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

2155

interface = NULL;

1765

2156

}

1766

2157

}

1767

2158

}

1768

2159

1769

2160

/* Run network hooks */

1770

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

1771

goto end;

2161

{

2162

if(mc.interfaces != NULL){

2163

interfaces_hooks = malloc(mc.interfaces_size);

2164

if(interfaces_hooks == NULL){

2165

perror_plus("malloc");

2166

goto end;

2167

}

2168

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

2169

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

2170

}

2171

run_network_hooks("start", interfaces_hooks != NULL ?

2172

interfaces_hooks : "", delay);

1772

2173

}

1773

2174

1774

2175

if(not debug){

1775

2176

avahi_set_log_function(empty_log);

1776

2177

}

1777

2178

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

2179

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

1811

2180

from the signal handler */

1812

2181

/* Initialize the pseudo-RNG for Avahi */

1813

2182

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

1814

mc.simple_poll = avahi_simple_poll_new();

1815

if(mc.simple_poll == NULL){

2183

simple_poll = avahi_simple_poll_new();

2184

if(simple_poll == NULL){

1816

2185

fprintf_plus(stderr,

1817

2186

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

1818

2187

exitcode = EX_UNAVAILABLE;

1882

2251

}

1883

2252

}

1884

2253

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");

2254

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

2255

if(mc.interfaces == NULL){

2256

struct dirent **direntries = NULL;

2257

/* Look for any good interfaces */

2258

ret = scandir(sys_class_net, &direntries, good_interface,

2259

alphasort);

2260

if(ret >= 1){

2261

/* Add all found interfaces to interfaces list */

2262

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

2263

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

2264

direntries[i]->d_name);

2265

if(ret_errno != 0){

2266

errno = ret_errno;

2267

perror_plus("argz_add");

2268

continue;

2269

}

2270

if(debug){

2271

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

2272

direntries[i]->d_name);

2273

}

2274

}

2275

free(direntries);

2276

} else {

2277

if(ret == 0){

2278

free(direntries);

2279

}

2280

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

2281

exitcode = EXIT_FAILURE;

2282

goto end;

2283

}

2284

}

2285

2286

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

2287

{

2288

char *interface = NULL;

2289

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

2290

interface))){

2291

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

2292

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

2293

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

2294

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

2295

interface);

2296

interface = NULL;

2297

while((interface = argz_next(mc.interfaces,

2298

mc.interfaces_size, interface))){

2299

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

2300

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

2301

interface);

2302

interface = NULL;

1970

2303

}

1971

2304

}

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

2305

break;

1990

2306

}

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

}

2307

bool interface_was_up = interface_is_up(interface);

2308

errno = bring_up_interface(interface, delay);

2309

if(not interface_was_up){

2310

if(errno != 0){

2311

perror_plus("Failed to bring up interface");

2312

} else {

2313

errno = argz_add(&interfaces_to_take_down,

2314

&interfaces_to_take_down_size,

2315

interface);

2316

if(errno != 0){

2317

perror_plus("argz_add");

2318

}

2319

}

2320

}

2321

}

2322

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

2323

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

2324

}

2325

}

2326

2327

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

2328

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

2329

if(debug){

2330

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

2331

mc.interfaces);

2332

}

2333

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

2020

2334

}

2021

2335

2022

2336

if(quit_now){

2023

2337

goto end;

2024

2338

}

2025

2339

2026

ret = init_gnutls_global(pubkey, seckey);

2340

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

2027

2341

if(ret == -1){

2028

2342

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

2029

2343

exitcode = EX_UNAVAILABLE;

2036

2350

goto end;

2037

2351

}

2038

2352

2039

if(mkdtemp(tempdir) == NULL){

2353

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

2354

tempdir = mkdtemp(run_tempdir);

2355

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

2356

if(debug){

2357

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

2358

run_tempdir, old_tempdir);

2359

}

2360

tempdir = mkdtemp(old_tempdir);

2361

}

2362

if(tempdir == NULL){

2040

2363

perror_plus("mkdtemp");

2041

2364

goto end;

2042

2365

}

2043

tempdir_created = true;

2044

2366

2045

2367

if(quit_now){

2046

2368

goto end;

2047

2369

}

2048

2370

2049

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

2371

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

2050

2372

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

2051

2373

exitcode = EX_UNAVAILABLE;

2052

2374

goto end;

2062

2384

/* Connect directly, do not use Zeroconf */

2063

2385

/* (Mainly meant for debugging) */

2064

2386

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

2387

2065

2388

if(address == NULL){

2066

2389

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

2067

2390

exitcode = EX_USAGE;

2072

2395

goto end;

2073

2396

}

2074

2397

2075

uint16_t port;

2398

in_port_t port;

2076

2399

errno = 0;

2077

2400

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

2078

2401

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

2079

or tmpmax != (uint16_t)tmpmax){

2402

or tmpmax != (in_port_t)tmpmax){

2080

2403

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

2081

2404

exitcode = EX_USAGE;

2082

2405

goto end;

2083

2406

}

2084

2407

2085

2408

if(quit_now){

2086

2409

goto end;

2087

2410

}

2088

2411

2089

port = (uint16_t)tmpmax;

2412

port = (in_port_t)tmpmax;

2090

2413

*address = '\0';

2091

2414

/* Colon in address indicates IPv6 */

2092

2415

int af;

2108

2431

}

2109

2432

2110

2433

while(not quit_now){

2111

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

2434

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

2435

&mc);

2112

2436

if(quit_now or ret == 0){

2113

2437

break;

2114

2438

}

2116

2440

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

2117

2441

(int)retry_interval);

2118

2442

}

2119

sleep((int)retry_interval);

2443

sleep((unsigned int)retry_interval);

2120

2444

}

2121

2445

2122

if (not quit_now){

2446

if(not quit_now){

2123

2447

exitcode = EXIT_SUCCESS;

2124

2448

}

2125

2449

2140

2464

config.publish_domain = 0;

2141

2465

2142

2466

/* Allocate a new server */

2143

mc.server = avahi_server_new(avahi_simple_poll_get

2144

(mc.simple_poll), &config, NULL,

2145

NULL, &error);

2467

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2468

&config, NULL, NULL, &ret_errno);

2146

2469

2147

2470

/* Free the Avahi configuration data */

2148

2471

avahi_server_config_free(&config);

2151

2474

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

2152

2475

if(mc.server == NULL){

2153

2476

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

2154

avahi_strerror(error));

2477

avahi_strerror(ret_errno));

2155

2478

exitcode = EX_UNAVAILABLE;

2156

2479

goto end;

2157

2480

}

2163

2486

/* Create the Avahi service browser */

2164

2487

sb = avahi_s_service_browser_new(mc.server, if_index,

2165

2488

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2166

NULL, 0, browse_callback, NULL);

2489

NULL, 0, browse_callback,

2490

(void *)&mc);

2167

2491

if(sb == NULL){

2168

2492

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

2169

2493

avahi_strerror(avahi_server_errno(mc.server)));

2180

2504

if(debug){

2181

2505

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

2182

2506

}

2183

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2507

2508

ret = avahi_loop_with_timeout(simple_poll,

2509

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

2186

2510

if(debug){

2187

2511

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

2188

2512

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

2195

2519

}

2196

2520

2197

2521

/* Cleanup things */

2522

free(mc.interfaces);

2523

2198

2524

if(sb != NULL)

2199

2525

avahi_s_service_browser_free(sb);

2200

2526

2201

2527

if(mc.server != NULL)

2202

2528

avahi_server_free(mc.server);

2203

2529

2204

if(mc.simple_poll != NULL)

2205

avahi_simple_poll_free(mc.simple_poll);

2530

if(simple_poll != NULL)

2531

avahi_simple_poll_free(simple_poll);

2206

2532

2207

2533

if(gnutls_initialized){

2208

2534

gnutls_certificate_free_credentials(mc.cred);

2225

2551

}

2226

2552

}

2227

2553

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

2554

/* Re-raise privileges */

2232

2555

{

2233

errno = 0;

2234

ret = seteuid(0);

2235

if(ret == -1){

2236

perror_plus("seteuid");

2556

ret_errno = raise_privileges();

2557

if(ret_errno != 0){

2558

errno = ret_errno;

2559

perror_plus("Failed to raise privileges");

2560

} else {

2561

2562

/* Run network hooks */

2563

run_network_hooks("stop", interfaces_hooks != NULL ?

2564

interfaces_hooks : "", delay);

2565

2566

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

2567

{

2568

char *interface = NULL;

2569

while((interface=argz_next(interfaces_to_take_down,

2570

interfaces_to_take_down_size,

2571

interface))){

2572

ret_errno = take_down_interface(interface);

2573

if(ret_errno != 0){

2574

errno = ret_errno;

2575

perror_plus("Failed to take down interface");

2576

}

2577

}

2578

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

2579

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

2580

" down\n");

2581

}

2582

}

2237

2583

}

2238

2584

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

}

2585

ret_errno = lower_privileges_permanently();

2586

if(ret_errno != 0){

2587

errno = ret_errno;

2588

perror_plus("Failed to lower privileges permanently");

2255

2589

}

2256

2590

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2591

2592

free(interfaces_to_take_down);

2593

free(interfaces_hooks);

2263

2594

2264

2595

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

2265

if(tempdir_created){

2596

if(tempdir != NULL){

2266

2597

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);

2598

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

2599

O_NOFOLLOW));

2600

if(tempdir_fd == -1){

2601

perror_plus("open");

2602

} else {

2603

#ifdef __GLIBC__

2604

#if __GLIBC_PREREQ(2, 15)

2605

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

2606

notdotentries, alphasort);

2607

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

2608

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

2609

alphasort);

2610

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

2611

#else /* not __GLIBC__ */

2612

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

2613

alphasort);

2614

#endif /* not __GLIBC__ */

2615

if(numentries >= 0){

2616

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

2617

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

2618

if(ret == -1){

2619

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

2620

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

2621

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

2622

}

2623

}

2624

2625

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

2626

free(direntries);

2627

if(numentries == -1){

2628

perror_plus("scandir");

2629

}

2630

ret = rmdir(tempdir);

2631

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

2632

perror_plus("rmdir");

2633

}

2286

2634

}

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");

2635

TEMP_FAILURE_RETRY(close(tempdir_fd));

2297

2636

}

2298

2637

}

2299

2638