/mandos/trunk : revision 585

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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*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

41

42

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

43

stdout, ferror() */

44

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

43

stdout, ferror(), remove() */

44

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

45

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

46

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

47

strtof(), abort() */

55

opendir(), DIR */

56

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

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

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inet_pton(), connect(),

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getnameinfo() */

60

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

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inet_pton(), connect() */

59

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

61

60

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

62

61

*/

63

62

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

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63

strtoimax() */

64

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

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

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program_invocation_short_name */

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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(),

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unlinkat() */

78

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

76

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

77

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

79

78

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

80

79

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

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80

argp_state, struct argp,

89

88

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

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89

WEXITSTATUS(), WTERMSIG() */

91

90

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

92

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

98

91

99

92

#ifdef __linux__

100

93

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

142

135

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

143

136

char *connect_to = NULL;

144

137

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

148

138

149

139

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

150

140

typedef struct server{

151

141

const char *ip;

152

in_port_t port;

142

uint16_t port;

153

143

AvahiIfIndex if_index;

154

144

int af;

155

145

struct timespec last_seen;

159

149

160

150

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

161

151

typedef struct {

152

AvahiSimplePoll *simple_poll;

162

153

AvahiServer *server;

163

154

gnutls_certificate_credentials_t cred;

164

155

unsigned int dh_bits;

166

157

const char *priority;

167

158

gpgme_ctx_t ctx;

168

159

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

160

} mandos_context;

172

161

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

162

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

163

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

164

.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

175

167

176

168

sig_atomic_t quit_now = 0;

177

169

int signal_received = 0;

185

177

perror(print_text);

186

178

}

187

179

188

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

180

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

189

181

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

190

182

va_list ap;

191

183

va_start (ap, format);

192

184

193

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

194

186

program_invocation_short_name));

195

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

187

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

196

188

}

197

189

198

190

/*

200

192

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

201

193

* "buffer_length" is how much is already used.

202

194

*/

203

__attribute__((nonnull, warn_unused_result))

204

195

size_t incbuffer(char **buffer, size_t buffer_length,

205

196

size_t buffer_capacity){

206

197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

198

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

199

if(buffer == NULL){

213

200

return 0;

214

201

}

215

*buffer = new_buf;

216

202

buffer_capacity += BUFFER_SIZE;

217

203

}

218

204

return buffer_capacity;

219

205

}

220

206

221

207

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

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

208

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

209

int af){

225

210

int ret;

226

211

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

227

212

if(new_server == NULL){

236

221

perror_plus("strdup");

237

222

return false;

238

223

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

224

/* Special case of first server */

245

if(*current_server == NULL){

225

if (mc.current_server == NULL){

246

226

new_server->next = new_server;

247

227

new_server->prev = new_server;

248

*current_server = new_server;

228

mc.current_server = new_server;

229

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

249

230

} else {

250

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

251

new_server->next = *current_server;

252

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

231

new_server->next = mc.current_server;

232

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

253

233

new_server->prev->next = new_server;

254

(*current_server)->prev = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

255

240

}

256

241

return true;

257

242

}

259

244

/*

260

245

* Initialize GPGME.

261

246

*/

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){

247

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

248

const char *tempdir){

267

249

gpgme_error_t rc;

268

250

gpgme_engine_info_t engine_info;

269

251

252

270

253

/*

271

254

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

272

255

*/

273

bool import_key(const char * const filename){

256

bool import_key(const char *filename){

274

257

int ret;

275

258

int fd;

276

259

gpgme_data_t pgp_data;

288

271

return false;

289

272

}

290

273

291

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

274

rc = gpgme_op_import(mc.ctx, pgp_data);

292

275

if(rc != GPG_ERR_NO_ERROR){

293

276

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

294

277

gpgme_strsource(rc), gpgme_strerror(rc));

338

321

}

339

322

340

323

/* Create new GPGME "context" */

341

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

324

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

342

325

if(rc != GPG_ERR_NO_ERROR){

343

326

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

344

327

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

357

340

* Decrypt OpenPGP data.

358

341

* Returns -1 on error

359

342

*/

360

__attribute__((nonnull, warn_unused_result))

361

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

362

344

size_t crypto_size,

363

char **plaintext,

364

mandos_context *mc){

345

char **plaintext){

365

346

gpgme_data_t dh_crypto, dh_plain;

366

347

gpgme_error_t rc;

367

348

ssize_t ret;

393

374

394

375

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

395

376

data buffer */

396

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

377

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

397

378

if(rc != GPG_ERR_NO_ERROR){

398

379

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

399

380

gpgme_strsource(rc), gpgme_strerror(rc));

400

381

plaintext_length = -1;

401

382

if(debug){

402

383

gpgme_decrypt_result_t result;

403

result = gpgme_op_decrypt_result(mc->ctx);

384

result = gpgme_op_decrypt_result(mc.ctx);

404

385

if(result == NULL){

405

386

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

406

387

} else {

483

464

return plaintext_length;

484

465

}

485

466

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

const char *ret = gnutls_strerror(value);

467

static const char * safer_gnutls_strerror(int value){

468

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

469

-Wunreachable-code */

489

470

if(ret == NULL)

490

471

ret = "(unknown)";

491

472

return ret;

492

473

}

493

474

494

475

/* GnuTLS log function callback */

495

__attribute__((nonnull))

496

476

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

497

477

const char* string){

498

478

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

499

479

}

500

480

501

__attribute__((nonnull, warn_unused_result))

502

481

static int init_gnutls_global(const char *pubkeyfilename,

503

const char *seckeyfilename,

504

mandos_context *mc){

482

const char *seckeyfilename){

505

483

int ret;

506

484

507

485

if(debug){

524

502

}

525

503

526

504

/* OpenPGP credentials */

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

528

506

if(ret != GNUTLS_E_SUCCESS){

529

507

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

530

508

safer_gnutls_strerror(ret));

540

518

}

541

519

542

520

ret = gnutls_certificate_set_openpgp_key_file

543

(mc->cred, pubkeyfilename, seckeyfilename,

521

(mc.cred, pubkeyfilename, seckeyfilename,

544

522

GNUTLS_OPENPGP_FMT_BASE64);

545

523

if(ret != GNUTLS_E_SUCCESS){

546

524

fprintf_plus(stderr,

552

530

}

553

531

554

532

/* GnuTLS server initialization */

555

ret = gnutls_dh_params_init(&mc->dh_params);

533

ret = gnutls_dh_params_init(&mc.dh_params);

556

534

if(ret != GNUTLS_E_SUCCESS){

557

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

558

536

" initialization: %s\n",

559

537

safer_gnutls_strerror(ret));

560

538

goto globalfail;

561

539

}

562

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

540

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

563

541

if(ret != GNUTLS_E_SUCCESS){

564

542

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

565

543

safer_gnutls_strerror(ret));

566

544

goto globalfail;

567

545

}

568

546

569

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

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

570

548

571

549

return 0;

572

550

573

551

globalfail:

574

552

575

gnutls_certificate_free_credentials(mc->cred);

553

gnutls_certificate_free_credentials(mc.cred);

576

554

gnutls_global_deinit();

577

gnutls_dh_params_deinit(mc->dh_params);

555

gnutls_dh_params_deinit(mc.dh_params);

578

556

return -1;

579

557

}

580

558

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

559

static int init_gnutls_session(gnutls_session_t *session){

584

560

int ret;

585

561

/* GnuTLS session creation */

586

562

do {

598

574

{

599

575

const char *err;

600

576

do {

601

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

577

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

602

578

if(quit_now){

603

579

gnutls_deinit(*session);

604

580

return -1;

615

591

616

592

do {

617

593

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

618

mc->cred);

594

mc.cred);

619

595

if(quit_now){

620

596

gnutls_deinit(*session);

621

597

return -1;

631

607

/* ignore client certificate if any. */

632

608

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

633

609

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

635

611

636

612

return 0;

637

613

}

641

617

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

642

618

643

619

/* Called when a Mandos server is found */

644

__attribute__((nonnull, warn_unused_result))

645

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

620

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

646

621

AvahiIfIndex if_index,

647

int af, mandos_context *mc){

622

int af){

648

623

int ret, tcp_sd = -1;

649

624

ssize_t sret;

650

struct sockaddr_storage to;

625

union {

626

struct sockaddr_in in;

627

struct sockaddr_in6 in6;

628

} to;

651

629

char *buffer = NULL;

652

630

char *decrypted_buffer = NULL;

653

631

size_t buffer_length = 0;

677

655

return -1;

678

656

}

679

657

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);

658

ret = init_gnutls_session(&session);

713

659

if(ret != 0){

714

660

return -1;

715

661

}

716

662

717

663

if(debug){

718

664

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

719

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

665

PRIu16 "\n", ip, port);

720

666

}

721

667

722

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

734

680

735

681

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

736

682

if(af == AF_INET6){

737

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

738

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

683

to.in6.sin6_family = (sa_family_t)af;

684

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

739

685

} else { /* IPv4 */

740

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

741

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

686

to.in.sin_family = (sa_family_t)af;

687

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

742

688

}

743

689

if(ret < 0 ){

744

690

int e = errno;

753

699

goto mandos_end;

754

700

}

755

701

if(af == AF_INET6){

756

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

757

if(IN6_IS_ADDR_LINKLOCAL

758

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

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

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

708

-Wunreachable-code*/

759

709

if(if_index == AVAHI_IF_UNSPEC){

760

710

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

761

711

" incomplete without a network interface\n");

763

713

goto mandos_end;

764

714

}

765

715

/* Set the network interface number as scope */

766

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

716

to.in6.sin6_scope_id = (uint32_t)if_index;

767

717

}

768

718

} else {

769

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

719

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

720

-Wconversion and

721

-Wunreachable-code */

770

722

}

771

723

772

724

if(quit_now){

780

732

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

781

733

perror_plus("if_indextoname");

782

734

} else {

783

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

784

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

735

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

736

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

785

737

}

786

738

} else {

787

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

788

ip, (uintmax_t)port);

739

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

740

ip, port);

789

741

}

790

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

791

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

744

const char *pcret;

792

745

if(af == AF_INET6){

793

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

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

746

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

747

sizeof(addrstr));

797

748

} else {

798

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

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

749

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

750

sizeof(addrstr));

802

751

}

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);

752

if(pcret == NULL){

753

perror_plus("inet_ntop");

754

} else {

755

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

756

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

757

}

809

758

}

810

759

}

811

760

815

764

}

816

765

817

766

if(af == AF_INET6){

818

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

819

sizeof(struct sockaddr_in6));

767

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

820

768

} else {

821

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

822

sizeof(struct sockaddr_in));

769

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

823

770

}

824

771

if(ret < 0){

825

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

772

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

826

773

int e = errno;

827

774

perror_plus("connect");

828

775

errno = e;

874

821

goto mandos_end;

875

822

}

876

823

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);

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

882

826

883

827

if(quit_now){

884

828

errno = EINTR;

989

933

if(buffer_length > 0){

990

934

ssize_t decrypted_buffer_size;

991

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

992

&decrypted_buffer, mc);

936

&decrypted_buffer);

993

937

if(decrypted_buffer_size >= 0){

994

938

995

939

written = 0;

1043

987

return retval;

1044

988

}

1045

989

1046

__attribute__((nonnull))

1047

990

static void resolve_callback(AvahiSServiceResolver *r,

1048

991

AvahiIfIndex interface,

1049

992

AvahiProtocol proto,

1057

1000

AVAHI_GCC_UNUSED AvahiStringList *txt,

1058

1001

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1059

1002

flags,

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1064

1005

1065

1006

/* Called whenever a service has been resolved successfully or

1066

1007

timed out */

1075

1016

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

1076

1017

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

1077

1018

domain,

1078

avahi_strerror(avahi_server_errno

1079

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

1019

avahi_strerror(avahi_server_errno(mc.server)));

1080

1020

break;

1081

1021

1082

1022

case AVAHI_RESOLVER_FOUND:

1088

1028

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

1089

1029

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

1090

1030

}

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1095

1033

if(ret == 0){

1096

avahi_simple_poll_quit(simple_poll);

1034

avahi_simple_poll_quit(mc.simple_poll);

1097

1035

} else {

1098

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

1099

avahi_proto_to_af(proto),

1100

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

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1101

1038

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

1102

1039

" list\n", name);

1103

1040

}

1116

1053

const char *domain,

1117

1054

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1118

1055

flags,

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1123

1058

1124

1059

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

1125

1060

is removed from the LAN */

1133

1068

case AVAHI_BROWSER_FAILURE:

1134

1069

1135

1070

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

1136

avahi_strerror(avahi_server_errno

1137

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

1138

avahi_simple_poll_quit(simple_poll);

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1139

1073

return;

1140

1074

1141

1075

case AVAHI_BROWSER_NEW:

1144

1078

the callback function is called the Avahi server will free the

1145

1079

resolver for us. */

1146

1080

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)

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1151

1084

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

1152

1085

" %s\n", name,

1153

avahi_strerror(avahi_server_errno

1154

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

1086

avahi_strerror(avahi_server_errno(mc.server)));

1155

1087

break;

1156

1088

1157

1089

case AVAHI_BROWSER_REMOVE:

1176

1108

signal_received = sig;

1177

1109

int old_errno = errno;

1178

1110

/* set main loop to exit */

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1181

1113

}

1182

1114

errno = old_errno;

1183

1115

}

1184

1116

1185

__attribute__((nonnull, warn_unused_result))

1186

1117

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

1187

1118

int ret;

1188

error_t ret_errno;

1189

1119

1190

1120

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

1191

1121

if(s < 0){

1192

ret_errno = errno;

1193

1122

perror_plus("socket");

1194

errno = ret_errno;

1195

1123

return false;

1196

1124

}

1197

1125

strcpy(ifr->ifr_name, ifname);

1198

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1199

1127

if(ret == -1){

1200

1128

if(debug){

1201

ret_errno = errno;

1202

1129

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1204

1130

}

1205

1131

return false;

1206

1132

}

1207

1133

return true;

1208

1134

}

1209

1135

1210

__attribute__((nonnull, warn_unused_result))

1211

1136

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

1212

1137

1213

1138

/* Reject the loopback device */

1255

1180

* corresponds to an acceptable network device.

1256

1181

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

1257

1182

*/

1258

__attribute__((nonnull, warn_unused_result))

1259

1183

int good_interface(const struct dirent *if_entry){

1260

1184

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

1261

1185

return 0;

1277

1201

}

1278

1202

1279

1203

/*

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))

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1244

}

1245

1314

1246

int notdotentries(const struct dirent *direntry){

1315

1247

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

1316

1248

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

1323

1255

}

1324

1256

1325

1257

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

1326

__attribute__((nonnull, warn_unused_result))

1327

1258

int runnable_hook(const struct dirent *direntry){

1328

1259

int ret;

1329

1260

size_t sret;

1337

1268

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

1338

1269

"abcdefghijklmnopqrstuvwxyz"

1339

1270

"0123456789"

1340

"_.-");

1271

"_-");

1341

1272

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

1342

1273

/* Contains non-allowed characters */

1343

1274

if(debug){

1347

1278

return 0;

1348

1279

}

1349

1280

1350

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

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1351

1289

if(ret == -1){

1352

1290

if(debug){

1353

1291

perror_plus("Could not stat hook");

1377

1315

return 1;

1378

1316

}

1379

1317

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1383

1319

int ret;

1384

1320

struct timespec now;

1385

1321

struct timespec waited_time;

1386

1322

intmax_t block_time;

1387

1323

1388

1324

while(true){

1389

if(mc->current_server == NULL){

1390

if(debug){

1325

if(mc.current_server == NULL){

1326

if (debug){

1391

1327

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

1392

1328

" No timeout!\n");

1393

1329

}

1394

1330

ret = avahi_simple_poll_iterate(s, -1);

1395

1331

} else {

1396

if(debug){

1332

if (debug){

1397

1333

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

1398

1334

" it, or wait\n");

1399

1335

}

1406

1342

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

1407

1343

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

1408

1344

waited_time.tv_sec = (now.tv_sec

1409

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

1345

- mc.current_server->last_seen.tv_sec);

1410

1346

waited_time.tv_nsec = (now.tv_nsec

1411

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

1347

- mc.current_server->last_seen.tv_nsec);

1412

1348

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

1413

1349

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

1414

1350

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

1416

1352

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

1417

1353

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

1418

1354

1419

if(debug){

1355

if (debug){

1420

1356

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

1421

1357

block_time);

1422

1358

}

1423

1359

1424

1360

if(block_time <= 0){

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);

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

1429

1365

if(ret == 0){

1430

avahi_simple_poll_quit(s);

1366

avahi_simple_poll_quit(mc.simple_poll);

1431

1367

return 0;

1432

1368

}

1433

1369

ret = clock_gettime(CLOCK_MONOTONIC,

1434

&mc->current_server->last_seen);

1370

&mc.current_server->last_seen);

1435

1371

if(ret == -1){

1436

1372

perror_plus("clock_gettime");

1437

1373

return -1;

1438

1374

}

1439

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

1375

mc.current_server = mc.current_server->next;

1440

1376

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

1441

1377

servers, but don't block */

1442

1378

}

1444

1380

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

1445

1381

}

1446

1382

if(ret != 0){

1447

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

1383

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

1448

1384

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

1449

1385

}

1450

1386

}

1451

1387

}

1452

1388

}

1453

1389

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

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

__attribute__((warn_unused_result))

1469

error_t raise_privileges_permanently(void){

1470

error_t old_errno = errno;

1471

error_t ret_errno = raise_privileges();

1472

if(ret_errno != 0){

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

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

1477

ret_errno = errno;

1478

perror_plus("seteuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

__attribute__((warn_unused_result))

1486

error_t lower_privileges(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("seteuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

perror_plus("setuid");

1505

}

1506

errno = old_errno;

1507

return ret_errno;

1508

}

1509

1510

#ifndef O_CLOEXEC

1511

/*

1512

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

1513

* Descriptor Flags".

1514

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

1515

*/

1516

__attribute__((warn_unused_result))

1517

static int set_cloexec_flag(int fd){

1518

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

1519

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

1520

if(ret < 0){

1521

return ret;

1522

}

1523

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

1524

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

1525

ret | FD_CLOEXEC));

1526

}

1527

#endif /* not O_CLOEXEC */

1528

1529

__attribute__((nonnull))

1530

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

1390

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

1531

1391

const float delay){

1532

1392

struct dirent **direntries;

1533

if(hookdir_fd == -1){

1534

hookdir_fd = open(hookdir, O_RDONLY |

1535

#ifdef O_CLOEXEC

1536

O_CLOEXEC

1537

#else /* not O_CLOEXEC */

1538

0

1539

#endif /* not O_CLOEXEC */

1540

);

1541

if(hookdir_fd == -1){

1542

if(errno == ENOENT){

1543

if(debug){

1544

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

1545

" found\n", hookdir);

1546

}

1547

} else {

1548

perror_plus("open");

1549

}

1550

return;

1551

}

1552

#ifndef O_CLOEXEC

1553

if(set_cloexec_flag(hookdir_fd) < 0){

1554

perror_plus("set_cloexec_flag");

1555

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

1556

perror_plus("close");

1557

} else {

1558

hookdir_fd = -1;

1559

}

1560

return;

1561

}

1562

#endif /* not O_CLOEXEC */

1563

}

1564

#ifdef __GLIBC__

1565

#if __GLIBC_PREREQ(2, 15)

1566

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

1567

runnable_hook, alphasort);

1568

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

1569

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

1570

alphasort);

1571

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

1572

#else /* not __GLIBC__ */

1573

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

1574

alphasort);

1575

#endif /* not __GLIBC__ */

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1576

1397

if(numhooks == -1){

1577

1398

perror_plus("scandir");

1578

return;

1579

}

1580

struct dirent *direntry;

1581

int ret;

1582

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

1583

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

1584

direntry = direntries[i];

1585

if(debug){

1586

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

1587

direntry->d_name);

1588

}

1589

pid_t hook_pid = fork();

1590

if(hook_pid == 0){

1591

/* Child */

1592

/* Raise privileges */

1593

if(raise_privileges_permanently() != 0){

1594

perror_plus("Failed to raise privileges");

1595

_exit(EX_NOPERM);

1596

}

1597

/* Set group */

1598

errno = 0;

1599

ret = setgid(0);

1600

if(ret == -1){

1601

perror_plus("setgid");

1602

_exit(EX_NOPERM);

1603

}

1604

/* Reset supplementary groups */

1605

errno = 0;

1606

ret = setgroups(0, NULL);

1607

if(ret == -1){

1608

perror_plus("setgroups");

1609

_exit(EX_NOPERM);

1610

}

1611

ret = dup2(devnull, STDIN_FILENO);

1612

if(ret == -1){

1613

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

1614

_exit(EX_OSERR);

1615

}

1616

ret = close(devnull);

1617

if(ret == -1){

1618

perror_plus("close");

1619

_exit(EX_OSERR);

1620

}

1621

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1622

if(ret == -1){

1623

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

1624

_exit(EX_OSERR);

1625

}

1626

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

1627

if(ret == -1){

1628

perror_plus("setenv");

1629

_exit(EX_OSERR);

1630

}

1631

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

1632

if(ret == -1){

1633

perror_plus("setenv");

1634

_exit(EX_OSERR);

1635

}

1636

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

1637

if(ret == -1){

1638

perror_plus("setenv");

1639

_exit(EX_OSERR);

1640

}

1641

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

1642

if(ret == -1){

1643

perror_plus("setenv");

1644

_exit(EX_OSERR);

1645

}

1646

char *delaystring;

1647

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

1648

if(ret == -1){

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

1649

1406

perror_plus("asprintf");

1650

_exit(EX_OSERR);

1651

}

1652

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

1653

if(ret == -1){

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

1654

1475

free(delaystring);

1655

perror_plus("setenv");

1656

_exit(EX_OSERR);

1657

}

1658

free(delaystring);

1659

if(connect_to != NULL){

1660

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

1661

if(ret == -1){

1662

perror_plus("setenv");

1663

_exit(EX_OSERR);

1664

}

1665

}

1666

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

1667

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

1668

perror_plus("fexecve");

1669

_exit(EXIT_FAILURE);

1670

}

1671

} else {

1672

int status;

1673

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

1674

perror_plus("waitpid");

1675

continue;

1676

}

1677

if(WIFEXITED(status)){

1678

if(WEXITSTATUS(status) != 0){

1679

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

1680

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

1681

WEXITSTATUS(status));

1682

continue;

1683

}

1684

} else if(WIFSIGNALED(status)){

1685

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

1686

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

1687

WTERMSIG(status));

1688

continue;

1689

} else {

1690

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

1691

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

1692

continue;

1693

}

1694

}

1695

if(debug){

1696

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

1697

direntry->d_name);

1698

}

1699

}

1700

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

1701

perror_plus("close");

1702

} else {

1703

hookdir_fd = -1;

1704

}

1705

close(devnull);

1706

}

1707

1708

__attribute__((nonnull, warn_unused_result))

1709

error_t bring_up_interface(const char *const interface,

1710

const float delay){

1711

error_t old_errno = errno;

1712

int ret;

1713

struct ifreq network;

1714

unsigned int if_index = if_nametoindex(interface);

1715

if(if_index == 0){

1716

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

1717

errno = old_errno;

1718

return ENXIO;

1719

}

1720

1721

if(quit_now){

1722

errno = old_errno;

1723

return EINTR;

1724

}

1725

1726

if(not interface_is_up(interface)){

1727

error_t ret_errno = 0, ioctl_errno = 0;

1728

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

1729

ret_errno = errno;

1730

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

1731

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

1732

errno = old_errno;

1733

return ret_errno;

1734

}

1735

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

1736

1737

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

1738

if(sd == -1){

1739

ret_errno = errno;

1740

perror_plus("socket");

1741

errno = old_errno;

1742

return ret_errno;

1743

}

1744

1745

if(quit_now){

1746

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

1747

if(ret == -1){

1748

perror_plus("close");

1749

}

1750

errno = old_errno;

1751

return EINTR;

1752

}

1753

1754

if(debug){

1755

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

1756

interface);

1757

}

1758

1759

/* Raise privileges */

1760

ret_errno = raise_privileges();

1761

if(ret_errno != 0){

1762

perror_plus("Failed to raise privileges");

1763

}

1764

1765

#ifdef __linux__

1766

int ret_linux;

1767

bool restore_loglevel = false;

1768

if(ret_errno == 0){

1769

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1770

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

1771

ret_linux = klogctl(8, NULL, 5);

1772

if(ret_linux == -1){

1773

perror_plus("klogctl");

1774

} else {

1775

restore_loglevel = true;

1776

}

1777

}

1778

#endif /* __linux__ */

1779

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

1780

ioctl_errno = errno;

1781

#ifdef __linux__

1782

if(restore_loglevel){

1783

ret_linux = klogctl(7, NULL, 0);

1784

if(ret_linux == -1){

1785

perror_plus("klogctl");

1786

}

1787

}

1788

#endif /* __linux__ */

1789

1790

/* If raise_privileges() succeeded above */

1791

if(ret_errno == 0){

1792

/* Lower privileges */

1793

ret_errno = lower_privileges();

1794

if(ret_errno != 0){

1795

errno = ret_errno;

1796

perror_plus("Failed to lower privileges");

1797

}

1798

}

1799

1800

/* Close the socket */

1801

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

1802

if(ret == -1){

1803

perror_plus("close");

1804

}

1805

1806

if(ret_setflags == -1){

1807

errno = ioctl_errno;

1808

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1809

errno = old_errno;

1810

return ioctl_errno;

1811

}

1812

} else if(debug){

1813

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

1814

interface);

1815

}

1816

1817

/* Sleep checking until interface is running.

1818

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

1819

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

1820

if(interface_is_running(interface)){

1821

break;

1822

}

1823

struct timespec sleeptime = { .tv_nsec = 250000000 };

1824

ret = nanosleep(&sleeptime, NULL);

1825

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

1826

perror_plus("nanosleep");

1827

}

1828

}

1829

1830

errno = old_errno;

1831

return 0;

1832

}

1833

1834

__attribute__((nonnull, warn_unused_result))

1835

error_t take_down_interface(const char *const interface){

1836

error_t old_errno = errno;

1837

struct ifreq network;

1838

unsigned int if_index = if_nametoindex(interface);

1839

if(if_index == 0){

1840

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

1841

errno = old_errno;

1842

return ENXIO;

1843

}

1844

if(interface_is_up(interface)){

1845

error_t ret_errno = 0, ioctl_errno = 0;

1846

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

1847

ret_errno = errno;

1848

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

1849

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

1850

errno = old_errno;

1851

return ret_errno;

1852

}

1853

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

1854

1855

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

1856

if(sd == -1){

1857

ret_errno = errno;

1858

perror_plus("socket");

1859

errno = old_errno;

1860

return ret_errno;

1861

}

1862

1863

if(debug){

1864

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

1865

interface);

1866

}

1867

1868

/* Raise privileges */

1869

ret_errno = raise_privileges();

1870

if(ret_errno != 0){

1871

perror_plus("Failed to raise privileges");

1872

}

1873

1874

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

1875

ioctl_errno = errno;

1876

1877

/* If raise_privileges() succeeded above */

1878

if(ret_errno == 0){

1879

/* Lower privileges */

1880

ret_errno = lower_privileges();

1881

if(ret_errno != 0){

1882

errno = ret_errno;

1883

perror_plus("Failed to lower privileges");

1884

}

1885

}

1886

1887

/* Close the socket */

1888

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

1889

if(ret == -1){

1890

perror_plus("close");

1891

}

1892

1893

if(ret_setflags == -1){

1894

errno = ioctl_errno;

1895

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1896

errno = old_errno;

1897

return ioctl_errno;

1898

}

1899

} else if(debug){

1900

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

1901

interface);

1902

}

1903

1904

errno = old_errno;

1905

return 0;

1476

if(connect_to != NULL){

1477

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

1478

if(ret == -1){

1479

perror_plus("setenv");

1480

_exit(EX_OSERR);

1481

}

1482

}

1483

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

1484

perror_plus("execl");

1485

_exit(EXIT_FAILURE);

1486

}

1487

} else {

1488

int status;

1489

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

1490

perror_plus("waitpid");

1491

free(fullname);

1492

continue;

1493

}

1494

if(WIFEXITED(status)){

1495

if(WEXITSTATUS(status) != 0){

1496

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

1497

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

1498

WEXITSTATUS(status));

1499

free(fullname);

1500

continue;

1501

}

1502

} else if(WIFSIGNALED(status)){

1503

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

1504

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

1505

WTERMSIG(status));

1506

free(fullname);

1507

continue;

1508

} else {

1509

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

1510

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

1511

free(fullname);

1512

continue;

1513

}

1514

}

1515

free(fullname);

1516

if(debug){

1517

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

1518

direntry->d_name);

1519

}

1520

}

1521

close(devnull);

1522

}

1523

return true;

1906

1524

}

1907

1525

1908

1526

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

1909

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

1910

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

1911

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

1912

.interfaces = NULL, .interfaces_size = 0 };

1913

1527

AvahiSServiceBrowser *sb = NULL;

1914

error_t ret_errno;

1528

int error;

1915

1529

int ret;

1916

1530

intmax_t tmpmax;

1917

1531

char *tmp;

1918

1532

int exitcode = EXIT_SUCCESS;

1919

char *interfaces_to_take_down = NULL;

1920

size_t interfaces_to_take_down_size = 0;

1921

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

1922

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

1923

char *tempdir = NULL;

1533

const char *interface = "";

1534

struct ifreq network;

1535

int sd = -1;

1536

bool take_down_interface = false;

1537

uid_t uid;

1538

gid_t gid;

1539

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

1540

bool tempdir_created = false;

1924

1541

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1925

1542

const char *seckey = PATHDIR "/" SECKEY;

1926

1543

const char *pubkey = PATHDIR "/" PUBKEY;

1927

char *interfaces_hooks = NULL;

1928

1544

1929

1545

bool gnutls_initialized = false;

1930

1546

bool gpgme_initialized = false;

2021

1637

connect_to = arg;

2022

1638

break;

2023

1639

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

2024

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

2025

arg, (int)',');

2026

if(ret_errno != 0){

2027

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

2028

}

1640

interface = arg;

2029

1641

break;

2030

1642

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

2031

1643

seckey = arg;

2108

1720

/* Work around Debian bug #633582:

2109

1721

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

2110

1722

2111

/* Re-raise privileges */

2112

ret_errno = raise_privileges();

2113

if(ret_errno != 0){

2114

errno = ret_errno;

2115

perror_plus("Failed to raise privileges");

1723

/* Re-raise priviliges */

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

2116

1728

} else {

2117

1729

struct stat st;

2118

1730

2159

1771

}

2160

1772

2161

1773

/* Lower privileges */

2162

ret_errno = lower_privileges();

2163

if(ret_errno != 0){

2164

errno = ret_errno;

2165

perror_plus("Failed to lower privileges");

2166

}

2167

}

2168

}

2169

2170

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

2171

{

2172

char *interface = NULL;

2173

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

2174

interface))){

2175

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

2176

and if_nametoindex(interface) == 0){

2177

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

2178

fprintf_plus(stderr, "Not using nonexisting interface"

2179

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

2180

}

2181

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

2182

interface = NULL;

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

2183

1778

}

2184

1779

}

2185

1780

}

2186

1781

2187

1782

/* Run network hooks */

2188

{

2189

if(mc.interfaces != NULL){

2190

interfaces_hooks = malloc(mc.interfaces_size);

2191

if(interfaces_hooks == NULL){

2192

perror_plus("malloc");

2193

goto end;

2194

}

2195

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

2196

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

2197

}

2198

run_network_hooks("start", interfaces_hooks != NULL ?

2199

interfaces_hooks : "", delay);

1783

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

1784

goto end;

2200

1785

}

2201

1786

2202

1787

if(not debug){

2203

1788

avahi_set_log_function(empty_log);

2204

1789

}

2205

1790

1791

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

1792

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1795

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

if(ret >= 1){

1803

/* Pick the first interface returned */

1804

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

1805

if(debug){

1806

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

1807

}

1808

if(interface == NULL){

1809

perror_plus("malloc");

1810

free(direntries);

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

free(direntries);

1815

} else {

1816

free(direntries);

1817

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

1818

exitcode = EXIT_FAILURE;

1819

goto end;

1820

}

1821

}

1822

2206

1823

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

2207

1824

from the signal handler */

2208

1825

/* Initialize the pseudo-RNG for Avahi */

2209

1826

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

2210

simple_poll = avahi_simple_poll_new();

2211

if(simple_poll == NULL){

1827

mc.simple_poll = avahi_simple_poll_new();

1828

if(mc.simple_poll == NULL){

2212

1829

fprintf_plus(stderr,

2213

1830

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

2214

1831

exitcode = EX_UNAVAILABLE;

2278

1895

}

2279

1896

}

2280

1897

2281

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

2282

if(mc.interfaces == NULL){

2283

struct dirent **direntries;

2284

/* Look for any good interfaces */

2285

ret = scandir(sys_class_net, &direntries, good_interface,

2286

alphasort);

2287

if(ret >= 1){

2288

/* Add all found interfaces to interfaces list */

2289

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

2290

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

2291

direntries[i]->d_name);

2292

if(ret_errno != 0){

2293

errno = ret_errno;

2294

perror_plus("argz_add");

2295

continue;

2296

}

2297

if(debug){

2298

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

2299

direntries[i]->d_name);

2300

}

2301

}

2302

free(direntries);

2303

} else {

2304

free(direntries);

2305

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

2306

exitcode = EXIT_FAILURE;

2307

goto end;

2308

}

2309

}

2310

2311

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

2312

{

2313

char *interface = NULL;

2314

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

2315

interface))){

2316

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

2317

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

2318

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

2319

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

2320

interface);

2321

interface = NULL;

2322

while((interface = argz_next(mc.interfaces,

2323

mc.interfaces_size, interface))){

2324

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

2325

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

2326

interface);

2327

interface = NULL;

1898

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

1899

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

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

if(if_index == 0){

1902

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

1903

exitcode = EX_UNAVAILABLE;

1904

goto end;

1905

}

1906

1907

if(quit_now){

1908

goto end;

1909

}

1910

1911

/* Re-raise priviliges */

1912

errno = 0;

1913

ret = seteuid(0);

1914

if(ret == -1){

1915

perror_plus("seteuid");

1916

}

1917

1918

#ifdef __linux__

1919

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1920

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

1921

ret = klogctl(8, NULL, 5);

1922

bool restore_loglevel = true;

1923

if(ret == -1){

1924

restore_loglevel = false;

1925

perror_plus("klogctl");

1926

}

1927

#endif /* __linux__ */

1928

1929

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1930

if(sd < 0){

1931

perror_plus("socket");

1932

exitcode = EX_OSERR;

1933

#ifdef __linux__

1934

if(restore_loglevel){

1935

ret = klogctl(7, NULL, 0);

1936

if(ret == -1){

1937

perror_plus("klogctl");

1938

}

1939

}

1940

#endif /* __linux__ */

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

strcpy(network.ifr_name, interface);

1950

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

1951

if(ret == -1){

1952

perror_plus("ioctl SIOCGIFFLAGS");

1953

#ifdef __linux__

1954

if(restore_loglevel){

1955

ret = klogctl(7, NULL, 0);

1956

if(ret == -1){

1957

perror_plus("klogctl");

1958

}

1959

}

1960

#endif /* __linux__ */

1961

exitcode = EX_OSERR;

1962

/* Lower privileges */

1963

errno = 0;

1964

ret = seteuid(uid);

1965

if(ret == -1){

1966

perror_plus("seteuid");

1967

}

1968

goto end;

1969

}

1970

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

1971

network.ifr_flags |= IFF_UP;

1972

take_down_interface = true;

1973

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

1974

if(ret == -1){

1975

take_down_interface = false;

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1977

exitcode = EX_OSERR;

1978

#ifdef __linux__

1979

if(restore_loglevel){

1980

ret = klogctl(7, NULL, 0);

1981

if(ret == -1){

1982

perror_plus("klogctl");

2328

1983

}

2329

1984

}

1985

#endif /* __linux__ */

1986

/* Lower privileges */

1987

errno = 0;

1988

ret = seteuid(uid);

1989

if(ret == -1){

1990

perror_plus("seteuid");

1991

}

1992

goto end;

1993

}

1994

}

1995

/* Sleep checking until interface is running.

1996

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

1997

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

1998

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

1999

if(ret == -1){

2000

perror_plus("ioctl SIOCGIFFLAGS");

2001

} else if(network.ifr_flags & IFF_RUNNING){

2330

2002

break;

2331

2003

}

2332

bool interface_was_up = interface_is_up(interface);

2333

errno = bring_up_interface(interface, delay);

2334

if(not interface_was_up){

2335

if(errno != 0){

2336

perror_plus("Failed to bring up interface");

2337

} else {

2338

errno = argz_add(&interfaces_to_take_down,

2339

&interfaces_to_take_down_size,

2340

interface);

2341

if(errno != 0){

2342

perror_plus("argz_add");

2343

}

2344

}

2345

}

2346

}

2347

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

2348

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

2349

}

2350

}

2351

2352

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

2353

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

2354

if(debug){

2355

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

2356

mc.interfaces);

2357

}

2358

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

2004

struct timespec sleeptime = { .tv_nsec = 250000000 };

2005

ret = nanosleep(&sleeptime, NULL);

2006

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

2007

perror_plus("nanosleep");

2008

}

2009

}

2010

if(not take_down_interface){

2011

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

2012

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

2013

if(ret == -1){

2014

perror_plus("close");

2015

}

2016

}

2017

#ifdef __linux__

2018

if(restore_loglevel){

2019

/* Restores kernel loglevel to default */

2020

ret = klogctl(7, NULL, 0);

2021

if(ret == -1){

2022

perror_plus("klogctl");

2023

}

2024

}

2025

#endif /* __linux__ */

2026

/* Lower privileges */

2027

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

2032

}

2359

2033

}

2360

2034

2361

2035

if(quit_now){

2362

2036

goto end;

2363

2037

}

2364

2038

2365

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

2039

ret = init_gnutls_global(pubkey, seckey);

2366

2040

if(ret == -1){

2367

2041

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

2368

2042

exitcode = EX_UNAVAILABLE;

2375

2049

goto end;

2376

2050

}

2377

2051

2378

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

2379

tempdir = mkdtemp(run_tempdir);

2380

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

2381

if(debug){

2382

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

2383

run_tempdir, old_tempdir);

2384

}

2385

tempdir = mkdtemp(old_tempdir);

2386

}

2387

if(tempdir == NULL){

2052

if(mkdtemp(tempdir) == NULL){

2388

2053

perror_plus("mkdtemp");

2389

2054

goto end;

2390

2055

}

2056

tempdir_created = true;

2391

2057

2392

2058

if(quit_now){

2393

2059

goto end;

2394

2060

}

2395

2061

2396

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

2062

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

2397

2063

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

2398

2064

exitcode = EX_UNAVAILABLE;

2399

2065

goto end;

2409

2075

/* Connect directly, do not use Zeroconf */

2410

2076

/* (Mainly meant for debugging) */

2411

2077

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

2412

2413

2078

if(address == NULL){

2414

2079

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

2415

2080

exitcode = EX_USAGE;

2420

2085

goto end;

2421

2086

}

2422

2087

2423

in_port_t port;

2088

uint16_t port;

2424

2089

errno = 0;

2425

2090

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

2426

2091

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

2427

or tmpmax != (in_port_t)tmpmax){

2092

or tmpmax != (uint16_t)tmpmax){

2428

2093

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

2429

2094

exitcode = EX_USAGE;

2430

2095

goto end;

2431

2096

}

2432

2097

2433

2098

if(quit_now){

2434

2099

goto end;

2435

2100

}

2436

2101

2437

port = (in_port_t)tmpmax;

2102

port = (uint16_t)tmpmax;

2438

2103

*address = '\0';

2439

2104

/* Colon in address indicates IPv6 */

2440

2105

int af;

2456

2121

}

2457

2122

2458

2123

while(not quit_now){

2459

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

2460

&mc);

2124

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

2461

2125

if(quit_now or ret == 0){

2462

2126

break;

2463

2127

}

2465

2129

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

2466

2130

(int)retry_interval);

2467

2131

}

2468

sleep((unsigned int)retry_interval);

2132

sleep((int)retry_interval);

2469

2133

}

2470

2134

2471

if(not quit_now){

2135

if (not quit_now){

2472

2136

exitcode = EXIT_SUCCESS;

2473

2137

}

2474

2138

2489

2153

config.publish_domain = 0;

2490

2154

2491

2155

/* Allocate a new server */

2492

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2493

&config, NULL, NULL, &ret_errno);

2156

mc.server = avahi_server_new(avahi_simple_poll_get

2157

(mc.simple_poll), &config, NULL,

2158

NULL, &error);

2494

2159

2495

2160

/* Free the Avahi configuration data */

2496

2161

avahi_server_config_free(&config);

2499

2164

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

2500

2165

if(mc.server == NULL){

2501

2166

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

2502

avahi_strerror(ret_errno));

2167

avahi_strerror(error));

2503

2168

exitcode = EX_UNAVAILABLE;

2504

2169

goto end;

2505

2170

}

2511

2176

/* Create the Avahi service browser */

2512

2177

sb = avahi_s_service_browser_new(mc.server, if_index,

2513

2178

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2514

NULL, 0, browse_callback,

2515

(void *)&mc);

2179

NULL, 0, browse_callback, NULL);

2516

2180

if(sb == NULL){

2517

2181

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

2518

2182

avahi_strerror(avahi_server_errno(mc.server)));

2529

2193

if(debug){

2530

2194

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

2531

2195

}

2532

2533

ret = avahi_loop_with_timeout(simple_poll,

2534

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

2196

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

2535

2199

if(debug){

2536

2200

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

2537

2201

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

2544

2208

}

2545

2209

2546

2210

/* Cleanup things */

2547

free(mc.interfaces);

2548

2549

2211

if(sb != NULL)

2550

2212

avahi_s_service_browser_free(sb);

2551

2213

2552

2214

if(mc.server != NULL)

2553

2215

avahi_server_free(mc.server);

2554

2216

2555

if(simple_poll != NULL)

2556

avahi_simple_poll_free(simple_poll);

2217

if(mc.simple_poll != NULL)

2218

avahi_simple_poll_free(mc.simple_poll);

2557

2219

2558

2220

if(gnutls_initialized){

2559

2221

gnutls_certificate_free_credentials(mc.cred);

2576

2238

}

2577

2239

}

2578

2240

2579

/* Re-raise privileges */

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2244

/* Re-raise priviliges */

2580

2245

{

2581

ret_errno = raise_privileges();

2582

if(ret_errno != 0){

2583

perror_plus("Failed to raise privileges");

2584

} else {

2585

2586

/* Run network hooks */

2587

run_network_hooks("stop", interfaces_hooks != NULL ?

2588

interfaces_hooks : "", delay);

2589

2590

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

2591

{

2592

char *interface = NULL;

2593

while((interface=argz_next(interfaces_to_take_down,

2594

interfaces_to_take_down_size,

2595

interface))){

2596

ret_errno = take_down_interface(interface);

2597

if(ret_errno != 0){

2598

errno = ret_errno;

2599

perror_plus("Failed to take down interface");

2600

}

2601

}

2602

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

2603

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

2604

" down\n");

2605

}

2606

}

2246

errno = 0;

2247

ret = seteuid(0);

2248

if(ret == -1){

2249

perror_plus("seteuid");

2607

2250

}

2608

2251

2609

ret_errno = lower_privileges_permanently();

2610

if(ret_errno != 0){

2611

perror_plus("Failed to lower privileges permanently");

2252

/* Take down the network interface */

2253

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

2254

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

2255

if(ret == -1){

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

2258

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

2259

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

2260

if(ret == -1){

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2262

}

2263

}

2264

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

2265

if(ret == -1){

2266

perror_plus("close");

2267

}

2612

2268

}

2613

2269

}

2614

2615

free(interfaces_to_take_down);

2616

free(interfaces_hooks);

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2617

2276

2618

2277

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

2619

if(tempdir != NULL){

2278

if(tempdir_created){

2620

2279

struct dirent **direntries = NULL;

2621

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

2622

if(tempdir_fd == -1){

2623

perror_plus("open");

2624

} else {

2625

#ifdef __GLIBC__

2626

#if __GLIBC_PREREQ(2, 15)

2627

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

2628

notdotentries, alphasort);

2629

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

2630

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

2631

alphasort);

2632

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

2633

#else /* not __GLIBC__ */

2634

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

2635

alphasort);

2636

#endif /* not __GLIBC__ */

2637

if(numentries > 0){

2638

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

2639

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

2640

if(ret == -1){

2641

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

2642

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

2643

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

2644

}

2645

}

2646

2647

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

2648

free(direntries);

2649

if(numentries == -1){

2650

perror_plus("scandir");

2651

}

2652

ret = rmdir(tempdir);

2653

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

2654

perror_plus("rmdir");

2655

}

2280

struct dirent *direntry = NULL;

2281

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

2282

alphasort);

2283

if (numentries > 0){

2284

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

2285

direntry = direntries[i];

2286

char *fullname = NULL;

2287

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

2288

direntry->d_name);

2289

if(ret < 0){

2290

perror_plus("asprintf");

2291

continue;

2292

}

2293

ret = remove(fullname);

2294

if(ret == -1){

2295

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

2296

strerror(errno));

2297

}

2298

free(fullname);

2656

2299

}

2657

TEMP_FAILURE_RETRY(close(tempdir_fd));

2300

}

2301

2302

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

2303

free(direntries);

2304

if (numentries == -1){

2305

perror_plus("scandir");

2306

}

2307

ret = rmdir(tempdir);

2308

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

2309

perror_plus("rmdir");

2658

2310

}

2659

2311

}

2660

2312