/mandos/trunk : revision 537

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

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(), remove() */

44

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

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,

58

inet_pton(), connect(),

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getnameinfo() */

58

inet_pton(), connect() */

60

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,

64

63

strtoimax() */

64

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

65

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

66

program_invocation_short_name */

67

#include <time.h> /* nanosleep(), time(), sleep() */

74

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

75

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

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

77

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

77

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

78

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

79

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

80

argp_state, struct argp,

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

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

91

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

92

argz_delete(), argz_append(),

93

argz_stringify(), argz_add(),

94

argz_count() */

95

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

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EAI_SYSTEM, gai_strerror() */

97

91

98

92

#ifdef __linux__

99

93

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

141

135

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

142

136

char *connect_to = NULL;

143

137

const char *hookdir = HOOKDIR;

144

int hookdir_fd = -1;

145

uid_t uid = 65534;

146

gid_t gid = 65534;

147

138

148

139

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

149

140

typedef struct server{

150

141

const char *ip;

151

in_port_t port;

142

uint16_t port;

152

143

AvahiIfIndex if_index;

153

144

int af;

154

145

struct timespec last_seen;

158

149

159

150

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

160

151

typedef struct {

152

AvahiSimplePoll *simple_poll;

161

153

AvahiServer *server;

162

154

gnutls_certificate_credentials_t cred;

163

155

unsigned int dh_bits;

165

157

const char *priority;

166

158

gpgme_ctx_t ctx;

167

159

server *current_server;

168

char *interfaces;

169

size_t interfaces_size;

170

160

} mandos_context;

171

161

172

/* global so signal handler can reach it*/

173

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 };

174

167

175

168

sig_atomic_t quit_now = 0;

176

169

int signal_received = 0;

184

177

perror(print_text);

185

178

}

186

179

187

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

180

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

188

181

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

189

182

va_list ap;

190

183

va_start (ap, format);

191

184

192

185

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

193

186

program_invocation_short_name));

194

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

187

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

195

188

}

196

189

197

190

/*

199

192

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

200

193

* "buffer_length" is how much is already used.

201

194

*/

202

__attribute__((nonnull, warn_unused_result))

203

195

size_t incbuffer(char **buffer, size_t buffer_length,

204

196

size_t buffer_capacity){

205

197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

206

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

207

if(new_buf == NULL){

208

int old_errno = errno;

209

free(*buffer);

210

errno = old_errno;

211

*buffer = NULL;

198

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

199

if(buffer == NULL){

212

200

return 0;

213

201

}

214

*buffer = new_buf;

215

202

buffer_capacity += BUFFER_SIZE;

216

203

}

217

204

return buffer_capacity;

218

205

}

219

206

220

207

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

221

__attribute__((nonnull, warn_unused_result))

222

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

223

int af, server **current_server){

208

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

209

int af){

224

210

int ret;

225

211

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

226

212

if(new_server == NULL){

235

221

perror_plus("strdup");

236

222

return false;

237

223

}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

242

}

243

224

/* Special case of first server */

244

if(*current_server == NULL){

225

if (mc.current_server == NULL){

245

226

new_server->next = new_server;

246

227

new_server->prev = new_server;

247

*current_server = new_server;

228

mc.current_server = new_server;

229

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

248

230

} else {

249

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

250

new_server->next = *current_server;

251

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

231

new_server->next = mc.current_server;

232

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

252

233

new_server->prev->next = new_server;

253

(*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;

254

240

}

255

241

return true;

256

242

}

258

244

/*

259

245

* Initialize GPGME.

260

246

*/

261

__attribute__((nonnull, warn_unused_result))

262

static bool init_gpgme(const char * const seckey,

263

const char * const pubkey,

264

const char * const tempdir,

265

mandos_context *mc){

247

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

248

const char *tempdir){

266

249

gpgme_error_t rc;

267

250

gpgme_engine_info_t engine_info;

268

251

252

269

253

/*

270

254

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

271

255

*/

272

bool import_key(const char * const filename){

256

bool import_key(const char *filename){

273

257

int ret;

274

258

int fd;

275

259

gpgme_data_t pgp_data;

287

271

return false;

288

272

}

289

273

290

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

274

rc = gpgme_op_import(mc.ctx, pgp_data);

291

275

if(rc != GPG_ERR_NO_ERROR){

292

276

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

293

277

gpgme_strsource(rc), gpgme_strerror(rc));

337

321

}

338

322

339

323

/* Create new GPGME "context" */

340

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

324

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

341

325

if(rc != GPG_ERR_NO_ERROR){

342

326

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

343

327

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

356

340

* Decrypt OpenPGP data.

357

341

* Returns -1 on error

358

342

*/

359

__attribute__((nonnull, warn_unused_result))

360

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

361

344

size_t crypto_size,

362

char **plaintext,

363

mandos_context *mc){

345

char **plaintext){

364

346

gpgme_data_t dh_crypto, dh_plain;

365

347

gpgme_error_t rc;

366

348

ssize_t ret;

392

374

393

375

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

394

376

data buffer */

395

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

377

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

396

378

if(rc != GPG_ERR_NO_ERROR){

397

379

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

398

380

gpgme_strsource(rc), gpgme_strerror(rc));

399

381

plaintext_length = -1;

400

382

if(debug){

401

383

gpgme_decrypt_result_t result;

402

result = gpgme_op_decrypt_result(mc->ctx);

384

result = gpgme_op_decrypt_result(mc.ctx);

403

385

if(result == NULL){

404

386

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

405

387

} else {

482

464

return plaintext_length;

483

465

}

484

466

485

__attribute__((warn_unused_result))

486

static const char *safer_gnutls_strerror(int value){

487

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 */

488

470

if(ret == NULL)

489

471

ret = "(unknown)";

490

472

return ret;

491

473

}

492

474

493

475

/* GnuTLS log function callback */

494

__attribute__((nonnull))

495

476

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

496

477

const char* string){

497

478

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

498

479

}

499

480

500

__attribute__((nonnull, warn_unused_result))

501

481

static int init_gnutls_global(const char *pubkeyfilename,

502

const char *seckeyfilename,

503

mandos_context *mc){

482

const char *seckeyfilename){

504

483

int ret;

505

484

506

485

if(debug){

523

502

}

524

503

525

504

/* OpenPGP credentials */

526

ret = gnutls_certificate_allocate_credentials(&mc->cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

527

506

if(ret != GNUTLS_E_SUCCESS){

528

507

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

529

508

safer_gnutls_strerror(ret));

539

518

}

540

519

541

520

ret = gnutls_certificate_set_openpgp_key_file

542

(mc->cred, pubkeyfilename, seckeyfilename,

521

(mc.cred, pubkeyfilename, seckeyfilename,

543

522

GNUTLS_OPENPGP_FMT_BASE64);

544

523

if(ret != GNUTLS_E_SUCCESS){

545

524

fprintf_plus(stderr,

551

530

}

552

531

553

532

/* GnuTLS server initialization */

554

ret = gnutls_dh_params_init(&mc->dh_params);

533

ret = gnutls_dh_params_init(&mc.dh_params);

555

534

if(ret != GNUTLS_E_SUCCESS){

556

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

557

536

" initialization: %s\n",

558

537

safer_gnutls_strerror(ret));

559

538

goto globalfail;

560

539

}

561

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

540

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

562

541

if(ret != GNUTLS_E_SUCCESS){

563

542

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

564

543

safer_gnutls_strerror(ret));

565

544

goto globalfail;

566

545

}

567

546

568

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

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

569

548

570

549

return 0;

571

550

572

551

globalfail:

573

552

574

gnutls_certificate_free_credentials(mc->cred);

553

gnutls_certificate_free_credentials(mc.cred);

575

554

gnutls_global_deinit();

576

gnutls_dh_params_deinit(mc->dh_params);

555

gnutls_dh_params_deinit(mc.dh_params);

577

556

return -1;

578

557

}

579

558

580

__attribute__((nonnull, warn_unused_result))

581

static int init_gnutls_session(gnutls_session_t *session,

582

mandos_context *mc){

559

static int init_gnutls_session(gnutls_session_t *session){

583

560

int ret;

584

561

/* GnuTLS session creation */

585

562

do {

597

574

{

598

575

const char *err;

599

576

do {

600

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

577

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

601

578

if(quit_now){

602

579

gnutls_deinit(*session);

603

580

return -1;

614

591

615

592

do {

616

593

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

617

mc->cred);

594

mc.cred);

618

595

if(quit_now){

619

596

gnutls_deinit(*session);

620

597

return -1;

630

607

/* ignore client certificate if any. */

631

608

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

632

609

633

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

634

611

635

612

return 0;

636

613

}

640

617

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

641

618

642

619

/* Called when a Mandos server is found */

643

__attribute__((nonnull, warn_unused_result))

644

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

620

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

645

621

AvahiIfIndex if_index,

646

int af, mandos_context *mc){

622

int af){

647

623

int ret, tcp_sd = -1;

648

624

ssize_t sret;

649

struct sockaddr_storage to;

625

union {

626

struct sockaddr_in in;

627

struct sockaddr_in6 in6;

628

} to;

650

629

char *buffer = NULL;

651

630

char *decrypted_buffer = NULL;

652

631

size_t buffer_length = 0;

676

655

return -1;

677

656

}

678

657

679

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

680

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

681

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

682

bool match = false;

683

{

684

char *interface = NULL;

685

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

686

interface))){

687

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

688

match = true;

689

break;

690

}

691

}

692

}

693

if(not match){

694

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

695

connect to the server */

696

if(debug){

697

char interface[IF_NAMESIZE];

698

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

699

perror_plus("if_indextoname");

700

} else {

701

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

702

" \"%s\"\n",

703

if_indextoname((unsigned int)if_index,

704

interface));

705

}

706

}

707

return -1;

708

}

709

}

710

711

ret = init_gnutls_session(&session, mc);

658

ret = init_gnutls_session(&session);

712

659

if(ret != 0){

713

660

return -1;

714

661

}

715

662

716

663

if(debug){

717

664

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

718

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

665

PRIu16 "\n", ip, port);

719

666

}

720

667

721

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

733

680

734

681

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

735

682

if(af == AF_INET6){

736

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

737

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);

738

685

} else { /* IPv4 */

739

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

740

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);

741

688

}

742

689

if(ret < 0 ){

743

690

int e = errno;

752

699

goto mandos_end;

753

700

}

754

701

if(af == AF_INET6){

755

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

756

if(IN6_IS_ADDR_LINKLOCAL

757

(&((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*/

758

709

if(if_index == AVAHI_IF_UNSPEC){

759

710

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

760

711

" incomplete without a network interface\n");

762

713

goto mandos_end;

763

714

}

764

715

/* Set the network interface number as scope */

765

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

716

to.in6.sin6_scope_id = (uint32_t)if_index;

766

717

}

767

718

} else {

768

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

719

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

720

-Wconversion and

721

-Wunreachable-code */

769

722

}

770

723

771

724

if(quit_now){

779

732

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

780

733

perror_plus("if_indextoname");

781

734

} else {

782

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

783

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

735

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

736

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

784

737

}

785

738

} else {

786

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

787

ip, (uintmax_t)port);

739

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

740

ip, port);

788

741

}

789

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

790

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

744

const char *pcret;

791

745

if(af == AF_INET6){

792

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

793

sizeof(struct sockaddr_in6),

794

addrstr, sizeof(addrstr), NULL, 0,

795

NI_NUMERICHOST);

746

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

747

sizeof(addrstr));

796

748

} else {

797

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

798

sizeof(struct sockaddr_in),

799

addrstr, sizeof(addrstr), NULL, 0,

800

NI_NUMERICHOST);

749

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

750

sizeof(addrstr));

801

751

}

802

if(ret == EAI_SYSTEM){

803

perror_plus("getnameinfo");

804

} else if(ret != 0) {

805

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

806

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

807

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

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

}

808

758

}

809

759

}

810

760

814

764

}

815

765

816

766

if(af == AF_INET6){

817

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

818

sizeof(struct sockaddr_in6));

767

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

819

768

} else {

820

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

821

sizeof(struct sockaddr_in));

769

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

822

770

}

823

771

if(ret < 0){

824

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

772

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

825

773

int e = errno;

826

774

perror_plus("connect");

827

775

errno = e;

873

821

goto mandos_end;

874

822

}

875

823

876

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

877

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

878

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

879

gnutls_transport_set_ptr(session,

880

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

881

826

882

827

if(quit_now){

883

828

errno = EINTR;

988

933

if(buffer_length > 0){

989

934

ssize_t decrypted_buffer_size;

990

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

991

&decrypted_buffer, mc);

936

&decrypted_buffer);

992

937

if(decrypted_buffer_size >= 0){

993

938

994

939

written = 0;

1042

987

return retval;

1043

988

}

1044

989

1045

__attribute__((nonnull))

1046

990

static void resolve_callback(AvahiSServiceResolver *r,

1047

991

AvahiIfIndex interface,

1048

992

AvahiProtocol proto,

1056

1000

AVAHI_GCC_UNUSED AvahiStringList *txt,

1057

1001

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1058

1002

flags,

1059

void *mc){

1060

if(r == NULL){

1061

return;

1062

}

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1063

1005

1064

1006

/* Called whenever a service has been resolved successfully or

1065

1007

timed out */

1074

1016

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

1075

1017

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

1076

1018

domain,

1077

avahi_strerror(avahi_server_errno

1078

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

1019

avahi_strerror(avahi_server_errno(mc.server)));

1079

1020

break;

1080

1021

1081

1022

case AVAHI_RESOLVER_FOUND:

1087

1028

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

1088

1029

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

1089

1030

}

1090

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

1091

interface,

1092

avahi_proto_to_af(proto),

1093

mc);

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1094

1033

if(ret == 0){

1095

avahi_simple_poll_quit(simple_poll);

1034

avahi_simple_poll_quit(mc.simple_poll);

1096

1035

} else {

1097

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

1098

avahi_proto_to_af(proto),

1099

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

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1100

1038

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

1101

1039

" list\n", name);

1102

1040

}

1115

1053

const char *domain,

1116

1054

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1117

1055

flags,

1118

void *mc){

1119

if(b == NULL){

1120

return;

1121

}

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1122

1058

1123

1059

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

1124

1060

is removed from the LAN */

1132

1068

case AVAHI_BROWSER_FAILURE:

1133

1069

1134

1070

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

1135

avahi_strerror(avahi_server_errno

1136

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

1137

avahi_simple_poll_quit(simple_poll);

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1138

1073

return;

1139

1074

1140

1075

case AVAHI_BROWSER_NEW:

1143

1078

the callback function is called the Avahi server will free the

1144

1079

resolver for us. */

1145

1080

1146

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

1147

interface, protocol, name, type,

1148

domain, protocol, 0,

1149

resolve_callback, mc) == NULL)

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1150

1084

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

1151

1085

" %s\n", name,

1152

avahi_strerror(avahi_server_errno

1153

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

1086

avahi_strerror(avahi_server_errno(mc.server)));

1154

1087

break;

1155

1088

1156

1089

case AVAHI_BROWSER_REMOVE:

1175

1108

signal_received = sig;

1176

1109

int old_errno = errno;

1177

1110

/* set main loop to exit */

1178

if(simple_poll != NULL){

1179

avahi_simple_poll_quit(simple_poll);

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1180

1113

}

1181

1114

errno = old_errno;

1182

1115

}

1183

1116

1184

__attribute__((nonnull, warn_unused_result))

1185

1117

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

1186

1118

int ret;

1187

error_t ret_errno;

1188

1119

1189

1120

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

1190

1121

if(s < 0){

1191

ret_errno = errno;

1192

1122

perror_plus("socket");

1193

errno = ret_errno;

1194

1123

return false;

1195

1124

}

1196

1125

strcpy(ifr->ifr_name, ifname);

1197

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1198

1127

if(ret == -1){

1199

1128

if(debug){

1200

ret_errno = errno;

1201

1129

perror_plus("ioctl SIOCGIFFLAGS");

1202

errno = ret_errno;

1203

1130

}

1204

1131

return false;

1205

1132

}

1206

1133

return true;

1207

1134

}

1208

1135

1209

__attribute__((nonnull, warn_unused_result))

1210

1136

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

1211

1137

1212

1138

/* Reject the loopback device */

1254

1180

* corresponds to an acceptable network device.

1255

1181

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

1256

1182

*/

1257

__attribute__((nonnull, warn_unused_result))

1258

1183

int good_interface(const struct dirent *if_entry){

1259

1184

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

1260

1185

return 0;

1276

1201

}

1277

1202

1278

1203

/*

1279

* This function determines if a network interface is up.

1280

*/

1281

__attribute__((nonnull, warn_unused_result))

1282

bool interface_is_up(const char *interface){

1283

struct ifreq ifr;

1284

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

1285

if(debug){

1286

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

1287

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

1288

}

1289

return false;

1290

}

1291

1292

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

1293

}

1294

1295

/*

1296

* This function determines if a network interface is running

1297

*/

1298

__attribute__((nonnull, warn_unused_result))

1299

bool interface_is_running(const char *interface){

1300

struct ifreq ifr;

1301

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

1302

if(debug){

1303

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

1304

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

1305

}

1306

return false;

1307

}

1308

1309

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

1310

}

1311

1312

__attribute__((nonnull, pure, warn_unused_result))

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

1313

1246

int notdotentries(const struct dirent *direntry){

1314

1247

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

1315

1248

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

1322

1255

}

1323

1256

1324

1257

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

1325

__attribute__((nonnull, warn_unused_result))

1326

1258

int runnable_hook(const struct dirent *direntry){

1327

1259

int ret;

1328

1260

size_t sret;

1336

1268

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

1337

1269

"abcdefghijklmnopqrstuvwxyz"

1338

1270

"0123456789"

1339

"_.-");

1271

"_-");

1340

1272

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

1341

1273

/* Contains non-allowed characters */

1342

1274

if(debug){

1360

1292

}

1361

1293

return 0;

1362

1294

}

1363

free(fullname);

1364

1295

if(not (S_ISREG(st.st_mode))){

1365

1296

/* Not a regular file */

1366

1297

if(debug){

1384

1315

return 1;

1385

1316

}

1386

1317

1387

__attribute__((nonnull, warn_unused_result))

1388

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1389

mandos_context *mc){

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1390

1319

int ret;

1391

1320

struct timespec now;

1392

1321

struct timespec waited_time;

1393

1322

intmax_t block_time;

1394

1323

1395

1324

while(true){

1396

if(mc->current_server == NULL){

1397

if(debug){

1325

if(mc.current_server == NULL){

1326

if (debug){

1398

1327

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

1399

1328

" No timeout!\n");

1400

1329

}

1401

1330

ret = avahi_simple_poll_iterate(s, -1);

1402

1331

} else {

1403

if(debug){

1332

if (debug){

1404

1333

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

1405

1334

" it, or wait\n");

1406

1335

}

1413

1342

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

1414

1343

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

1415

1344

waited_time.tv_sec = (now.tv_sec

1416

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

1345

- mc.current_server->last_seen.tv_sec);

1417

1346

waited_time.tv_nsec = (now.tv_nsec

1418

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

1347

- mc.current_server->last_seen.tv_nsec);

1419

1348

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

1420

1349

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

1421

1350

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

1423

1352

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

1424

1353

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

1425

1354

1426

if(debug){

1355

if (debug){

1427

1356

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

1428

1357

block_time);

1429

1358

}

1430

1359

1431

1360

if(block_time <= 0){

1432

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

1433

mc->current_server->port,

1434

mc->current_server->if_index,

1435

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);

1436

1365

if(ret == 0){

1437

avahi_simple_poll_quit(s);

1366

avahi_simple_poll_quit(mc.simple_poll);

1438

1367

return 0;

1439

1368

}

1440

1369

ret = clock_gettime(CLOCK_MONOTONIC,

1441

&mc->current_server->last_seen);

1370

&mc.current_server->last_seen);

1442

1371

if(ret == -1){

1443

1372

perror_plus("clock_gettime");

1444

1373

return -1;

1445

1374

}

1446

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

1375

mc.current_server = mc.current_server->next;

1447

1376

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

1448

1377

servers, but don't block */

1449

1378

}

1451

1380

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

1452

1381

}

1453

1382

if(ret != 0){

1454

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

1383

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

1455

1384

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

1456

1385

}

1457

1386

}

1458

1387

}

1459

1388

}

1460

1389

1461

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

1462

__attribute__((warn_unused_result))

1463

error_t raise_privileges(void){

1464

error_t old_errno = errno;

1465

error_t ret_errno = 0;

1466

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

1467

ret_errno = errno;

1468

perror_plus("seteuid");

1469

}

1470

errno = old_errno;

1471

return ret_errno;

1472

}

1473

1474

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

1475

__attribute__((warn_unused_result))

1476

error_t raise_privileges_permanently(void){

1477

error_t old_errno = errno;

1478

error_t ret_errno = raise_privileges();

1479

if(ret_errno != 0){

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

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

1484

ret_errno = errno;

1485

perror_plus("seteuid");

1486

}

1487

errno = old_errno;

1488

return ret_errno;

1489

}

1490

1491

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

1492

__attribute__((warn_unused_result))

1493

error_t lower_privileges(void){

1494

error_t old_errno = errno;

1495

error_t ret_errno = 0;

1496

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

1497

ret_errno = errno;

1498

perror_plus("seteuid");

1499

}

1500

errno = old_errno;

1501

return ret_errno;

1502

}

1503

1504

/* Lower privileges permanently */

1505

__attribute__((warn_unused_result))

1506

error_t lower_privileges_permanently(void){

1507

error_t old_errno = errno;

1508

error_t ret_errno = 0;

1509

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

1510

ret_errno = errno;

1511

perror_plus("setuid");

1512

}

1513

errno = old_errno;

1514

return ret_errno;

1515

}

1516

1517

#ifndef O_CLOEXEC

1518

/*

1519

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

1520

* Descriptor Flags".

1521

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

1522

*/

1523

__attribute__((warn_unused_result))

1524

static int set_cloexec_flag(int fd){

1525

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

1526

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

1527

if(ret < 0){

1528

return ret;

1529

}

1530

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

1531

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

1532

ret | FD_CLOEXEC));

1533

}

1534

#endif /* not O_CLOEXEC */

1535

1536

__attribute__((nonnull))

1537

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

1390

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

1538

1391

const float delay){

1539

1392

struct dirent **direntries;

1540

if(hookdir_fd == -1){

1541

hookdir_fd = open(hookdir, O_RDONLY |

1542

#ifdef O_CLOEXEC

1543

O_CLOEXEC

1544

#else /* not O_CLOEXEC */

1545

0

1546

#endif /* not O_CLOEXEC */

1547

);

1548

if(hookdir_fd == -1){

1549

if(errno == ENOENT){

1550

if(debug){

1551

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

1552

" found\n", hookdir);

1553

}

1554

} else {

1555

perror_plus("open");

1556

}

1557

return;

1558

}

1559

#ifndef O_CLOEXEC

1560

if(set_cloexec_flag(hookdir_fd) < 0){

1561

perror_plus("set_cloexec_flag");

1562

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

1563

perror_plus("close");

1564

} else {

1565

hookdir_fd = -1;

1566

}

1567

return;

1568

}

1569

#endif /* not O_CLOEXEC */

1570

}

1571

#ifdef __GLIBC__

1572

#if __GLIBC_PREREQ(2, 15)

1573

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

1574

runnable_hook, alphasort);

1575

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

1576

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

1577

alphasort);

1578

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

1579

#else /* not __GLIBC__ */

1580

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

1581

alphasort);

1582

#endif /* not __GLIBC__ */

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1583

1397

if(numhooks == -1){

1584

1398

perror_plus("scandir");

1585

return;

1586

}

1587

struct dirent *direntry;

1588

int ret;

1589

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

1590

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

1591

direntry = direntries[i];

1592

if(debug){

1593

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

1594

direntry->d_name);

1595

}

1596

pid_t hook_pid = fork();

1597

if(hook_pid == 0){

1598

/* Child */

1599

/* Raise privileges */

1600

if(raise_privileges_permanently() != 0){

1601

perror_plus("Failed to raise privileges");

1602

_exit(EX_NOPERM);

1603

}

1604

/* Set group */

1605

errno = 0;

1606

ret = setgid(0);

1607

if(ret == -1){

1608

perror_plus("setgid");

1609

_exit(EX_NOPERM);

1610

}

1611

/* Reset supplementary groups */

1612

errno = 0;

1613

ret = setgroups(0, NULL);

1614

if(ret == -1){

1615

perror_plus("setgroups");

1616

_exit(EX_NOPERM);

1617

}

1618

ret = dup2(devnull, STDIN_FILENO);

1619

if(ret == -1){

1620

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

1621

_exit(EX_OSERR);

1622

}

1623

ret = close(devnull);

1624

if(ret == -1){

1625

perror_plus("close");

1626

_exit(EX_OSERR);

1627

}

1628

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1629

if(ret == -1){

1630

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

1631

_exit(EX_OSERR);

1632

}

1633

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

1634

if(ret == -1){

1635

perror_plus("setenv");

1636

_exit(EX_OSERR);

1637

}

1638

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

1639

if(ret == -1){

1640

perror_plus("setenv");

1641

_exit(EX_OSERR);

1642

}

1643

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

1644

if(ret == -1){

1645

perror_plus("setenv");

1646

_exit(EX_OSERR);

1647

}

1648

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

1649

if(ret == -1){

1650

perror_plus("setenv");

1651

_exit(EX_OSERR);

1652

}

1653

char *delaystring;

1654

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

1655

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){

1656

1406

perror_plus("asprintf");

1657

_exit(EX_OSERR);

1658

}

1659

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

1660

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("VERBOSE", 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

}

1661

1475

free(delaystring);

1662

perror_plus("setenv");

1663

_exit(EX_OSERR);

1664

}

1665

free(delaystring);

1666

if(connect_to != NULL){

1667

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

1668

if(ret == -1){

1669

perror_plus("setenv");

1670

_exit(EX_OSERR);

1671

}

1672

}

1673

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

1674

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

1675

perror_plus("fexecve");

1676

_exit(EXIT_FAILURE);

1677

}

1678

} else {

1679

int status;

1680

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

1681

perror_plus("waitpid");

1682

continue;

1683

}

1684

if(WIFEXITED(status)){

1685

if(WEXITSTATUS(status) != 0){

1686

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

1687

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

1688

WEXITSTATUS(status));

1689

continue;

1690

}

1691

} else if(WIFSIGNALED(status)){

1692

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

1693

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

1694

WTERMSIG(status));

1695

continue;

1696

} else {

1697

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

1698

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

1699

continue;

1700

}

1701

}

1702

if(debug){

1703

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

1704

direntry->d_name);

1705

}

1706

}

1707

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

1708

perror_plus("close");

1709

} else {

1710

hookdir_fd = -1;

1711

}

1712

close(devnull);

1713

}

1714

1715

__attribute__((nonnull, warn_unused_result))

1716

error_t bring_up_interface(const char *const interface,

1717

const float delay){

1718

error_t old_errno = errno;

1719

int ret;

1720

struct ifreq network;

1721

unsigned int if_index = if_nametoindex(interface);

1722

if(if_index == 0){

1723

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

1724

errno = old_errno;

1725

return ENXIO;

1726

}

1727

1728

if(quit_now){

1729

errno = old_errno;

1730

return EINTR;

1731

}

1732

1733

if(not interface_is_up(interface)){

1734

error_t ret_errno = 0, ioctl_errno = 0;

1735

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

1736

ret_errno = errno;

1737

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

1738

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

1739

errno = old_errno;

1740

return ret_errno;

1741

}

1742

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

1743

1744

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

1745

if(sd == -1){

1746

ret_errno = errno;

1747

perror_plus("socket");

1748

errno = old_errno;

1749

return ret_errno;

1750

}

1751

1752

if(quit_now){

1753

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

1754

if(ret == -1){

1755

perror_plus("close");

1756

}

1757

errno = old_errno;

1758

return EINTR;

1759

}

1760

1761

if(debug){

1762

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

1763

interface);

1764

}

1765

1766

/* Raise privileges */

1767

ret_errno = raise_privileges();

1768

if(ret_errno != 0){

1769

perror_plus("Failed to raise privileges");

1770

}

1771

1772

#ifdef __linux__

1773

int ret_linux;

1774

bool restore_loglevel = false;

1775

if(ret_errno == 0){

1776

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1777

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

1778

ret_linux = klogctl(8, NULL, 5);

1779

if(ret_linux == -1){

1780

perror_plus("klogctl");

1781

} else {

1782

restore_loglevel = true;

1783

}

1784

}

1785

#endif /* __linux__ */

1786

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

1787

ioctl_errno = errno;

1788

#ifdef __linux__

1789

if(restore_loglevel){

1790

ret_linux = klogctl(7, NULL, 0);

1791

if(ret_linux == -1){

1792

perror_plus("klogctl");

1793

}

1794

}

1795

#endif /* __linux__ */

1796

1797

/* If raise_privileges() succeeded above */

1798

if(ret_errno == 0){

1799

/* Lower privileges */

1800

ret_errno = lower_privileges();

1801

if(ret_errno != 0){

1802

errno = ret_errno;

1803

perror_plus("Failed to lower privileges");

1804

}

1805

}

1806

1807

/* Close the socket */

1808

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

1809

if(ret == -1){

1810

perror_plus("close");

1811

}

1812

1813

if(ret_setflags == -1){

1814

errno = ioctl_errno;

1815

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1816

errno = old_errno;

1817

return ioctl_errno;

1818

}

1819

} else if(debug){

1820

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

1821

interface);

1822

}

1823

1824

/* Sleep checking until interface is running.

1825

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

1826

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

1827

if(interface_is_running(interface)){

1828

break;

1829

}

1830

struct timespec sleeptime = { .tv_nsec = 250000000 };

1831

ret = nanosleep(&sleeptime, NULL);

1832

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

1833

perror_plus("nanosleep");

1834

}

1835

}

1836

1837

errno = old_errno;

1838

return 0;

1839

}

1840

1841

__attribute__((nonnull, warn_unused_result))

1842

error_t take_down_interface(const char *const interface){

1843

error_t old_errno = errno;

1844

struct ifreq network;

1845

unsigned int if_index = if_nametoindex(interface);

1846

if(if_index == 0){

1847

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

1848

errno = old_errno;

1849

return ENXIO;

1850

}

1851

if(interface_is_up(interface)){

1852

error_t ret_errno = 0, ioctl_errno = 0;

1853

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

1854

ret_errno = errno;

1855

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

1856

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

1857

errno = old_errno;

1858

return ret_errno;

1859

}

1860

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

1861

1862

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

1863

if(sd == -1){

1864

ret_errno = errno;

1865

perror_plus("socket");

1866

errno = old_errno;

1867

return ret_errno;

1868

}

1869

1870

if(debug){

1871

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

1872

interface);

1873

}

1874

1875

/* Raise privileges */

1876

ret_errno = raise_privileges();

1877

if(ret_errno != 0){

1878

perror_plus("Failed to raise privileges");

1879

}

1880

1881

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

1882

ioctl_errno = errno;

1883

1884

/* If raise_privileges() succeeded above */

1885

if(ret_errno == 0){

1886

/* Lower privileges */

1887

ret_errno = lower_privileges();

1888

if(ret_errno != 0){

1889

errno = ret_errno;

1890

perror_plus("Failed to lower privileges");

1891

}

1892

}

1893

1894

/* Close the socket */

1895

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

1896

if(ret == -1){

1897

perror_plus("close");

1898

}

1899

1900

if(ret_setflags == -1){

1901

errno = ioctl_errno;

1902

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1903

errno = old_errno;

1904

return ioctl_errno;

1905

}

1906

} else if(debug){

1907

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

1908

interface);

1909

}

1910

1911

errno = old_errno;

1912

return 0;

1476

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

1477

perror_plus("execl");

1478

_exit(EXIT_FAILURE);

1479

}

1480

} else {

1481

int status;

1482

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

1483

perror_plus("waitpid");

1484

free(fullname);

1485

continue;

1486

}

1487

if(WIFEXITED(status)){

1488

if(WEXITSTATUS(status) != 0){

1489

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

1490

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

1491

WEXITSTATUS(status));

1492

free(fullname);

1493

continue;

1494

}

1495

} else if(WIFSIGNALED(status)){

1496

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

1497

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

1498

WTERMSIG(status));

1499

free(fullname);

1500

continue;

1501

} else {

1502

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

1503

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

1504

free(fullname);

1505

continue;

1506

}

1507

}

1508

free(fullname);

1509

if(debug){

1510

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

1511

direntry->d_name);

1512

}

1513

}

1514

close(devnull);

1515

}

1516

return true;

1913

1517

}

1914

1518

1915

1519

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

1916

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

1917

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

1918

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

1919

.interfaces = NULL, .interfaces_size = 0 };

1920

1520

AvahiSServiceBrowser *sb = NULL;

1921

error_t ret_errno;

1521

int error;

1922

1522

int ret;

1923

1523

intmax_t tmpmax;

1924

1524

char *tmp;

1925

1525

int exitcode = EXIT_SUCCESS;

1926

char *interfaces_to_take_down = NULL;

1927

size_t interfaces_to_take_down_size = 0;

1928

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

1929

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

1930

char *tempdir = NULL;

1526

const char *interface = "";

1527

struct ifreq network;

1528

int sd = -1;

1529

bool take_down_interface = false;

1530

uid_t uid;

1531

gid_t gid;

1532

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

1533

bool tempdir_created = false;

1931

1534

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1932

1535

const char *seckey = PATHDIR "/" SECKEY;

1933

1536

const char *pubkey = PATHDIR "/" PUBKEY;

1934

char *interfaces_hooks = NULL;

1935

1537

1936

1538

bool gnutls_initialized = false;

1937

1539

bool gpgme_initialized = false;

1999

1601

.group = 2 },

2000

1602

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

2001

1603

.arg = "SECONDS",

2002

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

1604

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

2003

1605

.group = 2 },

2004

1606

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

2005

1607

.arg = "DIR",

2028

1630

connect_to = arg;

2029

1631

break;

2030

1632

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

2031

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

2032

arg, (int)',');

2033

if(ret_errno != 0){

2034

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

2035

}

1633

interface = arg;

2036

1634

break;

2037

1635

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

2038

1636

seckey = arg;

2115

1713

/* Work around Debian bug #633582:

2116

1714

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

2117

1715

2118

/* Re-raise privileges */

2119

ret_errno = raise_privileges();

2120

if(ret_errno != 0){

2121

errno = ret_errno;

2122

perror_plus("Failed to raise privileges");

1716

/* Re-raise priviliges */

1717

errno = 0;

1718

ret = seteuid(0);

1719

if(ret == -1){

1720

perror_plus("seteuid");

2123

1721

} else {

2124

1722

struct stat st;

2125

1723

2166

1764

}

2167

1765

2168

1766

/* Lower privileges */

2169

ret_errno = lower_privileges();

2170

if(ret_errno != 0){

2171

errno = ret_errno;

2172

perror_plus("Failed to lower privileges");

2173

}

2174

}

2175

}

2176

2177

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

2178

{

2179

char *interface = NULL;

2180

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

2181

interface))){

2182

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

2183

and if_nametoindex(interface) == 0){

2184

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

2185

fprintf_plus(stderr, "Not using nonexisting interface"

2186

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

2187

}

2188

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

2189

interface = NULL;

1767

errno = 0;

1768

ret = seteuid(uid);

1769

if(ret == -1){

1770

perror_plus("seteuid");

2190

1771

}

2191

1772

}

2192

1773

}

2193

1774

2194

1775

/* Run network hooks */

2195

{

2196

if(mc.interfaces != NULL){

2197

interfaces_hooks = malloc(mc.interfaces_size);

2198

if(interfaces_hooks == NULL){

2199

perror_plus("malloc");

2200

goto end;

2201

}

2202

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

2203

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

2204

}

2205

run_network_hooks("start", interfaces_hooks != NULL ?

2206

interfaces_hooks : "", delay);

1776

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

1777

goto end;

2207

1778

}

2208

1779

2209

1780

if(not debug){

2210

1781

avahi_set_log_function(empty_log);

2211

1782

}

2212

1783

1784

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

1785

struct dirent **direntries;

1786

/* First look for interfaces that are up */

1787

ret = scandir(sys_class_net, &direntries, up_interface,

1788

alphasort);

1789

if(ret == 0){

1790

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

1791

free(direntries);

1792

ret = scandir(sys_class_net, &direntries, good_interface,

1793

alphasort);

1794

}

1795

if(ret >= 1){

1796

/* Pick the first interface returned */

1797

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

1798

if(debug){

1799

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

1800

}

1801

if(interface == NULL){

1802

perror_plus("malloc");

1803

free(direntries);

1804

exitcode = EXIT_FAILURE;

1805

goto end;

1806

}

1807

free(direntries);

1808

} else {

1809

free(direntries);

1810

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

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

}

1815

2213

1816

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

2214

1817

from the signal handler */

2215

1818

/* Initialize the pseudo-RNG for Avahi */

2216

1819

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

2217

simple_poll = avahi_simple_poll_new();

2218

if(simple_poll == NULL){

1820

mc.simple_poll = avahi_simple_poll_new();

1821

if(mc.simple_poll == NULL){

2219

1822

fprintf_plus(stderr,

2220

1823

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

2221

1824

exitcode = EX_UNAVAILABLE;

2285

1888

}

2286

1889

}

2287

1890

2288

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

2289

if(mc.interfaces == NULL){

2290

struct dirent **direntries;

2291

/* Look for any good interfaces */

2292

ret = scandir(sys_class_net, &direntries, good_interface,

2293

alphasort);

2294

if(ret >= 1){

2295

/* Add all found interfaces to interfaces list */

2296

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

2297

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

2298

direntries[i]->d_name);

2299

if(ret_errno != 0){

2300

errno = ret_errno;

2301

perror_plus("argz_add");

2302

continue;

2303

}

2304

if(debug){

2305

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

2306

direntries[i]->d_name);

2307

}

2308

}

2309

free(direntries);

2310

} else {

2311

free(direntries);

2312

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

2313

exitcode = EXIT_FAILURE;

2314

goto end;

2315

}

2316

}

2317

2318

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

2319

{

2320

char *interface = NULL;

2321

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

2322

interface))){

2323

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

2324

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

2325

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

2326

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

2327

interface);

2328

interface = NULL;

2329

while((interface = argz_next(mc.interfaces,

2330

mc.interfaces_size, interface))){

2331

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

2332

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

2333

interface);

2334

interface = NULL;

1891

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

1892

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

1893

if_index = (AvahiIfIndex) if_nametoindex(interface);

1894

if(if_index == 0){

1895

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

1896

exitcode = EX_UNAVAILABLE;

1897

goto end;

1898

}

1899

1900

if(quit_now){

1901

goto end;

1902

}

1903

1904

/* Re-raise priviliges */

1905

errno = 0;

1906

ret = seteuid(0);

1907

if(ret == -1){

1908

perror_plus("seteuid");

1909

}

1910

1911

#ifdef __linux__

1912

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1913

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

1914

ret = klogctl(8, NULL, 5);

1915

bool restore_loglevel = true;

1916

if(ret == -1){

1917

restore_loglevel = false;

1918

perror_plus("klogctl");

1919

}

1920

#endif /* __linux__ */

1921

1922

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1923

if(sd < 0){

1924

perror_plus("socket");

1925

exitcode = EX_OSERR;

1926

#ifdef __linux__

1927

if(restore_loglevel){

1928

ret = klogctl(7, NULL, 0);

1929

if(ret == -1){

1930

perror_plus("klogctl");

1931

}

1932

}

1933

#endif /* __linux__ */

1934

/* Lower privileges */

1935

errno = 0;

1936

ret = seteuid(uid);

1937

if(ret == -1){

1938

perror_plus("seteuid");

1939

}

1940

goto end;

1941

}

1942

strcpy(network.ifr_name, interface);

1943

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

1944

if(ret == -1){

1945

perror_plus("ioctl SIOCGIFFLAGS");

1946

#ifdef __linux__

1947

if(restore_loglevel){

1948

ret = klogctl(7, NULL, 0);

1949

if(ret == -1){

1950

perror_plus("klogctl");

1951

}

1952

}

1953

#endif /* __linux__ */

1954

exitcode = EX_OSERR;

1955

/* Lower privileges */

1956

errno = 0;

1957

ret = seteuid(uid);

1958

if(ret == -1){

1959

perror_plus("seteuid");

1960

}

1961

goto end;

1962

}

1963

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

1964

network.ifr_flags |= IFF_UP;

1965

take_down_interface = true;

1966

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

1967

if(ret == -1){

1968

take_down_interface = false;

1969

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1970

exitcode = EX_OSERR;

1971

#ifdef __linux__

1972

if(restore_loglevel){

1973

ret = klogctl(7, NULL, 0);

1974

if(ret == -1){

1975

perror_plus("klogctl");

2335

1976

}

2336

1977

}

1978

#endif /* __linux__ */

1979

/* Lower privileges */

1980

errno = 0;

1981

ret = seteuid(uid);

1982

if(ret == -1){

1983

perror_plus("seteuid");

1984

}

1985

goto end;

1986

}

1987

}

1988

/* Sleep checking until interface is running.

1989

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

1990

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

1991

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

1992

if(ret == -1){

1993

perror_plus("ioctl SIOCGIFFLAGS");

1994

} else if(network.ifr_flags & IFF_RUNNING){

2337

1995

break;

2338

1996

}

2339

bool interface_was_up = interface_is_up(interface);

2340

errno = bring_up_interface(interface, delay);

2341

if(not interface_was_up){

2342

if(errno != 0){

2343

perror_plus("Failed to bring up interface");

2344

} else {

2345

errno = argz_add(&interfaces_to_take_down,

2346

&interfaces_to_take_down_size,

2347

interface);

2348

if(errno != 0){

2349

perror_plus("argz_add");

2350

}

2351

}

2352

}

2353

}

2354

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

2355

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

2356

}

2357

}

2358

2359

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

2360

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

2361

if(debug){

2362

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

2363

mc.interfaces);

2364

}

2365

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

1997

struct timespec sleeptime = { .tv_nsec = 250000000 };

1998

ret = nanosleep(&sleeptime, NULL);

1999

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

2000

perror_plus("nanosleep");

2001

}

2002

}

2003

if(not take_down_interface){

2004

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

2005

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

2006

if(ret == -1){

2007

perror_plus("close");

2008

}

2009

}

2010

#ifdef __linux__

2011

if(restore_loglevel){

2012

/* Restores kernel loglevel to default */

2013

ret = klogctl(7, NULL, 0);

2014

if(ret == -1){

2015

perror_plus("klogctl");

2016

}

2017

}

2018

#endif /* __linux__ */

2019

/* Lower privileges */

2020

errno = 0;

2021

/* Lower privileges */

2022

ret = seteuid(uid);

2023

if(ret == -1){

2024

perror_plus("seteuid");

2025

}

2366

2026

}

2367

2027

2368

2028

if(quit_now){

2369

2029

goto end;

2370

2030

}

2371

2031

2372

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

2032

ret = init_gnutls_global(pubkey, seckey);

2373

2033

if(ret == -1){

2374

2034

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

2375

2035

exitcode = EX_UNAVAILABLE;

2382

2042

goto end;

2383

2043

}

2384

2044

2385

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

2386

tempdir = mkdtemp(run_tempdir);

2387

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

2388

if(debug){

2389

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

2390

run_tempdir, old_tempdir);

2391

}

2392

tempdir = mkdtemp(old_tempdir);

2393

}

2394

if(tempdir == NULL){

2045

if(mkdtemp(tempdir) == NULL){

2395

2046

perror_plus("mkdtemp");

2396

2047

goto end;

2397

2048

}

2049

tempdir_created = true;

2398

2050

2399

2051

if(quit_now){

2400

2052

goto end;

2401

2053

}

2402

2054

2403

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

2055

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

2404

2056

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

2405

2057

exitcode = EX_UNAVAILABLE;

2406

2058

goto end;

2416

2068

/* Connect directly, do not use Zeroconf */

2417

2069

/* (Mainly meant for debugging) */

2418

2070

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

2419

2420

2071

if(address == NULL){

2421

2072

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

2422

2073

exitcode = EX_USAGE;

2427

2078

goto end;

2428

2079

}

2429

2080

2430

in_port_t port;

2081

uint16_t port;

2431

2082

errno = 0;

2432

2083

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

2433

2084

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

2434

or tmpmax != (in_port_t)tmpmax){

2085

or tmpmax != (uint16_t)tmpmax){

2435

2086

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

2436

2087

exitcode = EX_USAGE;

2437

2088

goto end;

2438

2089

}

2439

2090

2440

2091

if(quit_now){

2441

2092

goto end;

2442

2093

}

2443

2094

2444

port = (in_port_t)tmpmax;

2095

port = (uint16_t)tmpmax;

2445

2096

*address = '\0';

2446

2097

/* Colon in address indicates IPv6 */

2447

2098

int af;

2463

2114

}

2464

2115

2465

2116

while(not quit_now){

2466

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

2467

&mc);

2117

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

2468

2118

if(quit_now or ret == 0){

2469

2119

break;

2470

2120

}

2472

2122

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

2473

2123

(int)retry_interval);

2474

2124

}

2475

sleep((unsigned int)retry_interval);

2125

sleep((int)retry_interval);

2476

2126

}

2477

2127

2478

if(not quit_now){

2128

if (not quit_now){

2479

2129

exitcode = EXIT_SUCCESS;

2480

2130

}

2481

2131

2496

2146

config.publish_domain = 0;

2497

2147

2498

2148

/* Allocate a new server */

2499

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2500

&config, NULL, NULL, &ret_errno);

2149

mc.server = avahi_server_new(avahi_simple_poll_get

2150

(mc.simple_poll), &config, NULL,

2151

NULL, &error);

2501

2152

2502

2153

/* Free the Avahi configuration data */

2503

2154

avahi_server_config_free(&config);

2506

2157

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

2507

2158

if(mc.server == NULL){

2508

2159

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

2509

avahi_strerror(ret_errno));

2160

avahi_strerror(error));

2510

2161

exitcode = EX_UNAVAILABLE;

2511

2162

goto end;

2512

2163

}

2518

2169

/* Create the Avahi service browser */

2519

2170

sb = avahi_s_service_browser_new(mc.server, if_index,

2520

2171

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2521

NULL, 0, browse_callback,

2522

(void *)&mc);

2172

NULL, 0, browse_callback, NULL);

2523

2173

if(sb == NULL){

2524

2174

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

2525

2175

avahi_strerror(avahi_server_errno(mc.server)));

2536

2186

if(debug){

2537

2187

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

2538

2188

}

2539

2540

ret = avahi_loop_with_timeout(simple_poll,

2541

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

2189

2190

ret = avahi_loop_with_timeout(mc.simple_poll,

2191

(int)(retry_interval * 1000));

2542

2192

if(debug){

2543

2193

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

2544

2194

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

2551

2201

}

2552

2202

2553

2203

/* Cleanup things */

2554

free(mc.interfaces);

2555

2556

2204

if(sb != NULL)

2557

2205

avahi_s_service_browser_free(sb);

2558

2206

2559

2207

if(mc.server != NULL)

2560

2208

avahi_server_free(mc.server);

2561

2209

2562

if(simple_poll != NULL)

2563

avahi_simple_poll_free(simple_poll);

2210

if(mc.simple_poll != NULL)

2211

avahi_simple_poll_free(mc.simple_poll);

2564

2212

2565

2213

if(gnutls_initialized){

2566

2214

gnutls_certificate_free_credentials(mc.cred);

2583

2231

}

2584

2232

}

2585

2233

2586

/* Re-raise privileges */

2234

/* Run network hooks */

2235

run_network_hooks("stop", interface, delay);

2236

2237

/* Re-raise priviliges */

2587

2238

{

2588

ret_errno = raise_privileges();

2589

if(ret_errno != 0){

2590

perror_plus("Failed to raise privileges");

2591

} else {

2592

2593

/* Run network hooks */

2594

run_network_hooks("stop", interfaces_hooks != NULL ?

2595

interfaces_hooks : "", delay);

2596

2597

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

2598

{

2599

char *interface = NULL;

2600

while((interface=argz_next(interfaces_to_take_down,

2601

interfaces_to_take_down_size,

2602

interface))){

2603

ret_errno = take_down_interface(interface);

2604

if(ret_errno != 0){

2605

errno = ret_errno;

2606

perror_plus("Failed to take down interface");

2607

}

2608

}

2609

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

2610

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

2611

" down\n");

2612

}

2613

}

2239

errno = 0;

2240

ret = seteuid(0);

2241

if(ret == -1){

2242

perror_plus("seteuid");

2614

2243

}

2615

2244

2616

ret_errno = lower_privileges_permanently();

2617

if(ret_errno != 0){

2618

perror_plus("Failed to lower privileges permanently");

2245

/* Take down the network interface */

2246

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

2247

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

2248

if(ret == -1){

2249

perror_plus("ioctl SIOCGIFFLAGS");

2250

} else if(network.ifr_flags & IFF_UP){

2251

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

2252

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

2253

if(ret == -1){

2254

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2255

}

2256

}

2257

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

2258

if(ret == -1){

2259

perror_plus("close");

2260

}

2619

2261

}

2620

2262

}

2621

2622

free(interfaces_to_take_down);

2623

free(interfaces_hooks);

2263

/* Lower privileges permanently */

2264

errno = 0;

2265

ret = setuid(uid);

2266

if(ret == -1){

2267

perror_plus("setuid");

2268

}

2624

2269

2625

2270

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

2626

if(tempdir != NULL){

2271

if(tempdir_created){

2627

2272

struct dirent **direntries = NULL;

2628

2273

struct dirent *direntry = NULL;

2629

2274

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

2630

2275

alphasort);

2631

if(numentries > 0){

2276

if (numentries > 0){

2632

2277

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

2633

2278

direntry = direntries[i];

2634

2279

char *fullname = NULL;

2646

2291

free(fullname);

2647

2292

}

2648

2293

}

2649

2294

2650

2295

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

2651

2296

free(direntries);

2652

if(numentries == -1){

2297

if (numentries == -1){

2653

2298

perror_plus("scandir");

2654

2299

}

2655

2300

ret = rmdir(tempdir);