/mandos/trunk : revision 692

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

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

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 */

44

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

45

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

46

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

47

strtof(), abort() */

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect() */

58

inet_pton(), connect(),

59

getnameinfo() */

59

60

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

60

61

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

61

62

*/

62

63

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

63

64

strtoimax() */

64

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

65

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

66

program_invocation_short_name */

67

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

73

*/

74

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

75

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

76

setgid(), pause() */

77

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

76

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

77

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

78

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

79

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

80

argp_state, struct argp,

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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,

96

EAI_SYSTEM, gai_strerror() */

90

97

91

98

#ifdef __linux__

92

99

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

134

141

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

135

142

char *connect_to = NULL;

136

143

const char *hookdir = HOOKDIR;

144

int hookdir_fd = -1;

145

uid_t uid = 65534;

146

gid_t gid = 65534;

137

147

138

148

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

139

149

typedef struct server{

140

150

const char *ip;

141

uint16_t port;

151

in_port_t port;

142

152

AvahiIfIndex if_index;

143

153

int af;

144

154

struct timespec last_seen;

148

158

149

159

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

150

160

typedef struct {

151

AvahiSimplePoll *simple_poll;

152

161

AvahiServer *server;

153

162

gnutls_certificate_credentials_t cred;

154

163

unsigned int dh_bits;

156

165

const char *priority;

157

166

gpgme_ctx_t ctx;

158

167

server *current_server;

168

char *interfaces;

169

size_t interfaces_size;

159

170

} mandos_context;

160

171

161

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

162

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

163

.dh_bits = 1024, .priority = "SECURE256"

164

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

165

.current_server = NULL };

172

/* global so signal handler can reach it*/

173

AvahiSimplePoll *simple_poll;

166

174

167

175

sig_atomic_t quit_now = 0;

168

176

int signal_received = 0;

169

177

170

178

/* Function to use when printing errors */

171

179

void perror_plus(const char *print_text){

180

int e = errno;

172

181

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

173

182

program_invocation_short_name);

183

errno = e;

174

184

perror(print_text);

175

185

}

176

186

187

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

177

188

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

178

189

va_list ap;

179

190

va_start (ap, format);

180

191

181

192

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

182

193

program_invocation_short_name));

183

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

194

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

184

195

}

185

196

186

197

/*

188

199

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

189

200

* "buffer_length" is how much is already used.

190

201

*/

202

__attribute__((nonnull, warn_unused_result))

191

203

size_t incbuffer(char **buffer, size_t buffer_length,

192

204

size_t buffer_capacity){

193

205

if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

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

195

if(buffer == NULL){

206

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

207

if(new_buf == NULL){

208

int old_errno = errno;

209

free(*buffer);

210

errno = old_errno;

211

*buffer = NULL;

196

212

return 0;

197

213

}

214

*buffer = new_buf;

198

215

buffer_capacity += BUFFER_SIZE;

199

216

}

200

217

return buffer_capacity;

201

218

}

202

219

203

220

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

204

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

205

int af){

221

__attribute__((nonnull, warn_unused_result))

222

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

223

int af, server **current_server){

206

224

int ret;

207

225

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

208

226

if(new_server == NULL){

209

227

perror_plus("malloc");

210

return -1;

228

return false;

211

229

}

212

230

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

213

231

.port = port,

215

233

.af = af };

216

234

if(new_server->ip == NULL){

217

235

perror_plus("strdup");

218

return -1;

236

return false;

237

}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

219

242

}

220

243

/* Special case of first server */

221

if (mc.current_server == NULL){

244

if(*current_server == NULL){

222

245

new_server->next = new_server;

223

246

new_server->prev = new_server;

224

mc.current_server = new_server;

225

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

247

*current_server = new_server;

226

248

} else {

227

new_server->next = mc.current_server;

228

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

249

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

250

new_server->next = *current_server;

251

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

229

252

new_server->prev->next = new_server;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

253

(*current_server)->prev = new_server;

254

}

255

return true;

238

256

}

239

257

240

258

/*

241

259

* Initialize GPGME.

242

260

*/

243

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

244

const char *tempdir){

261

__attribute__((nonnull, warn_unused_result))

262

static bool init_gpgme(const char * const seckey,

263

const char * const pubkey,

264

const char * const tempdir,

265

mandos_context *mc){

245

266

gpgme_error_t rc;

246

267

gpgme_engine_info_t engine_info;

247

268

248

249

269

/*

250

270

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

251

271

*/

252

bool import_key(const char *filename){

272

bool import_key(const char * const filename){

253

273

int ret;

254

274

int fd;

255

275

gpgme_data_t pgp_data;

267

287

return false;

268

288

}

269

289

270

rc = gpgme_op_import(mc.ctx, pgp_data);

290

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

271

291

if(rc != GPG_ERR_NO_ERROR){

272

292

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

273

293

gpgme_strsource(rc), gpgme_strerror(rc));

317

337

}

318

338

319

339

/* Create new GPGME "context" */

320

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

340

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

321

341

if(rc != GPG_ERR_NO_ERROR){

322

342

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

323

343

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

336

356

* Decrypt OpenPGP data.

337

357

* Returns -1 on error

338

358

*/

359

__attribute__((nonnull, warn_unused_result))

339

360

static ssize_t pgp_packet_decrypt(const char *cryptotext,

340

361

size_t crypto_size,

341

char **plaintext){

362

char **plaintext,

363

mandos_context *mc){

342

364

gpgme_data_t dh_crypto, dh_plain;

343

365

gpgme_error_t rc;

344

366

ssize_t ret;

370

392

371

393

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

372

394

data buffer */

373

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

395

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

374

396

if(rc != GPG_ERR_NO_ERROR){

375

397

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

376

398

gpgme_strsource(rc), gpgme_strerror(rc));

377

399

plaintext_length = -1;

378

400

if(debug){

379

401

gpgme_decrypt_result_t result;

380

result = gpgme_op_decrypt_result(mc.ctx);

402

result = gpgme_op_decrypt_result(mc->ctx);

381

403

if(result == NULL){

382

404

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

383

405

} else {

460

482

return plaintext_length;

461

483

}

462

484

463

static const char * safer_gnutls_strerror(int value){

464

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

465

-Wunreachable-code */

485

__attribute__((warn_unused_result))

486

static const char *safer_gnutls_strerror(int value){

487

const char *ret = gnutls_strerror(value);

466

488

if(ret == NULL)

467

489

ret = "(unknown)";

468

490

return ret;

469

491

}

470

492

471

493

/* GnuTLS log function callback */

494

__attribute__((nonnull))

472

495

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

473

496

const char* string){

474

497

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

475

498

}

476

499

500

__attribute__((nonnull, warn_unused_result))

477

501

static int init_gnutls_global(const char *pubkeyfilename,

478

const char *seckeyfilename){

502

const char *seckeyfilename,

503

mandos_context *mc){

479

504

int ret;

480

505

481

506

if(debug){

498

523

}

499

524

500

525

/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

526

ret = gnutls_certificate_allocate_credentials(&mc->cred);

502

527

if(ret != GNUTLS_E_SUCCESS){

503

528

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

504

529

safer_gnutls_strerror(ret));

514

539

}

515

540

516

541

ret = gnutls_certificate_set_openpgp_key_file

517

(mc.cred, pubkeyfilename, seckeyfilename,

542

(mc->cred, pubkeyfilename, seckeyfilename,

518

543

GNUTLS_OPENPGP_FMT_BASE64);

519

544

if(ret != GNUTLS_E_SUCCESS){

520

545

fprintf_plus(stderr,

526

551

}

527

552

528

553

/* GnuTLS server initialization */

529

ret = gnutls_dh_params_init(&mc.dh_params);

554

ret = gnutls_dh_params_init(&mc->dh_params);

530

555

if(ret != GNUTLS_E_SUCCESS){

531

556

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

557

" initialization: %s\n",

533

558

safer_gnutls_strerror(ret));

534

559

goto globalfail;

535

560

}

536

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

561

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

537

562

if(ret != GNUTLS_E_SUCCESS){

538

563

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

539

564

safer_gnutls_strerror(ret));

540

565

goto globalfail;

541

566

}

542

567

543

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

568

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

544

569

545

570

return 0;

546

571

547

572

globalfail:

548

573

549

gnutls_certificate_free_credentials(mc.cred);

574

gnutls_certificate_free_credentials(mc->cred);

550

575

gnutls_global_deinit();

551

gnutls_dh_params_deinit(mc.dh_params);

576

gnutls_dh_params_deinit(mc->dh_params);

552

577

return -1;

553

578

}

554

579

555

static int init_gnutls_session(gnutls_session_t *session){

580

__attribute__((nonnull, warn_unused_result))

581

static int init_gnutls_session(gnutls_session_t *session,

582

mandos_context *mc){

556

583

int ret;

557

584

/* GnuTLS session creation */

558

585

do {

570

597

{

571

598

const char *err;

572

599

do {

573

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

600

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

574

601

if(quit_now){

575

602

gnutls_deinit(*session);

576

603

return -1;

587

614

588

615

do {

589

616

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

590

mc.cred);

617

mc->cred);

591

618

if(quit_now){

592

619

gnutls_deinit(*session);

593

620

return -1;

603

630

/* ignore client certificate if any. */

604

631

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

605

632

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

633

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

607

634

608

635

return 0;

609

636

}

613

640

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

614

641

615

642

/* Called when a Mandos server is found */

616

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

643

__attribute__((nonnull, warn_unused_result))

644

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

617

645

AvahiIfIndex if_index,

618

int af){

646

int af, mandos_context *mc){

619

647

int ret, tcp_sd = -1;

620

648

ssize_t sret;

621

union {

622

struct sockaddr_in in;

623

struct sockaddr_in6 in6;

624

} to;

649

struct sockaddr_storage to;

625

650

char *buffer = NULL;

626

651

char *decrypted_buffer = NULL;

627

652

size_t buffer_length = 0;

651

676

return -1;

652

677

}

653

678

654

ret = init_gnutls_session(&session);

679

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

680

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

681

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

682

bool match = false;

683

{

684

char *interface = NULL;

685

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

686

interface))){

687

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

688

match = true;

689

break;

690

}

691

}

692

}

693

if(not match){

694

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

695

connect to the server */

696

if(debug){

697

char interface[IF_NAMESIZE];

698

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

699

perror_plus("if_indextoname");

700

} else {

701

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

702

" \"%s\"\n",

703

if_indextoname((unsigned int)if_index,

704

interface));

705

}

706

}

707

return -1;

708

}

709

}

710

711

ret = init_gnutls_session(&session, mc);

655

712

if(ret != 0){

656

713

return -1;

657

714

}

658

715

659

716

if(debug){

660

717

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

661

PRIu16 "\n", ip, port);

718

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

662

719

}

663

720

664

721

tcp_sd = socket(pf, SOCK_STREAM, 0);

676

733

677

734

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

678

735

if(af == AF_INET6){

679

to.in6.sin6_family = (sa_family_t)af;

680

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

736

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

737

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

681

738

} else { /* IPv4 */

682

to.in.sin_family = (sa_family_t)af;

683

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

739

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

740

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

684

741

}

685

742

if(ret < 0 ){

686

743

int e = errno;

695

752

goto mandos_end;

696

753

}

697

754

if(af == AF_INET6){

698

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

699

-Wconversion and

700

-Wunreachable-code */

701

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

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

704

-Wunreachable-code*/

755

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

756

if(IN6_IS_ADDR_LINKLOCAL

757

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

705

758

if(if_index == AVAHI_IF_UNSPEC){

706

759

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

707

760

" incomplete without a network interface\n");

709

762

goto mandos_end;

710

763

}

711

764

/* Set the network interface number as scope */

712

to.in6.sin6_scope_id = (uint32_t)if_index;

765

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

713

766

}

714

767

} else {

715

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

716

-Wconversion and

717

-Wunreachable-code */

768

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

718

769

}

719

770

720

771

if(quit_now){

728

779

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

729

780

perror_plus("if_indextoname");

730

781

} else {

731

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

732

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

782

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

783

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

733

784

}

734

785

} else {

735

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

736

ip, port);

786

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

787

ip, (uintmax_t)port);

737

788

}

738

789

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

790

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

740

const char *pcret;

741

791

if(af == AF_INET6){

742

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

743

sizeof(addrstr));

792

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

793

sizeof(struct sockaddr_in6),

794

addrstr, sizeof(addrstr), NULL, 0,

795

NI_NUMERICHOST);

744

796

} else {

745

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

746

sizeof(addrstr));

797

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

798

sizeof(struct sockaddr_in),

799

addrstr, sizeof(addrstr), NULL, 0,

800

NI_NUMERICHOST);

747

801

}

748

if(pcret == NULL){

749

perror_plus("inet_ntop");

750

} else {

751

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

752

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

753

}

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);

754

808

}

755

809

}

756

810

760

814

}

761

815

762

816

if(af == AF_INET6){

763

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

817

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

818

sizeof(struct sockaddr_in6));

764

819

} else {

765

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

820

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

821

sizeof(struct sockaddr_in));

766

822

}

767

823

if(ret < 0){

768

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

824

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

769

825

int e = errno;

770

826

perror_plus("connect");

771

827

errno = e;

817

873

goto mandos_end;

818

874

}

819

875

820

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

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

876

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

877

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

878

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

879

gnutls_transport_set_ptr(session,

880

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

822

881

823

882

if(quit_now){

824

883

errno = EINTR;

929

988

if(buffer_length > 0){

930

989

ssize_t decrypted_buffer_size;

931

990

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

932

&decrypted_buffer);

991

&decrypted_buffer, mc);

933

992

if(decrypted_buffer_size >= 0){

934

993

935

994

written = 0;

983

1042

return retval;

984

1043

}

985

1044

1045

__attribute__((nonnull))

986

1046

static void resolve_callback(AvahiSServiceResolver *r,

987

1047

AvahiIfIndex interface,

988

1048

AvahiProtocol proto,

996

1056

AVAHI_GCC_UNUSED AvahiStringList *txt,

997

1057

AVAHI_GCC_UNUSED AvahiLookupResultFlags

998

1058

flags,

999

AVAHI_GCC_UNUSED void* userdata){

1000

assert(r);

1059

void *mc){

1060

if(r == NULL){

1061

return;

1062

}

1001

1063

1002

1064

/* Called whenever a service has been resolved successfully or

1003

1065

timed out */

1012

1074

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

1013

1075

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

1014

1076

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_strerror(avahi_server_errno

1078

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

1016

1079

break;

1017

1080

1018

1081

case AVAHI_RESOLVER_FOUND:

1024

1087

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

1025

1088

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

1026

1089

}

1027

int ret = start_mandos_communication(ip, port, interface,

1028

avahi_proto_to_af(proto));

1090

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

1091

interface,

1092

avahi_proto_to_af(proto),

1093

mc);

1029

1094

if(ret == 0){

1030

avahi_simple_poll_quit(mc.simple_poll);

1095

avahi_simple_poll_quit(simple_poll);

1031

1096

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1097

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

1098

avahi_proto_to_af(proto),

1099

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

1100

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

1101

" list\n", name);

1102

}

1034

1103

}

1035

1104

}

1036

1105

}

1046

1115

const char *domain,

1047

1116

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1048

1117

flags,

1049

AVAHI_GCC_UNUSED void* userdata){

1050

assert(b);

1118

void *mc){

1119

if(b == NULL){

1120

return;

1121

}

1051

1122

1052

1123

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

1053

1124

is removed from the LAN */

1061

1132

case AVAHI_BROWSER_FAILURE:

1062

1133

1063

1134

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1065

avahi_simple_poll_quit(mc.simple_poll);

1135

avahi_strerror(avahi_server_errno

1136

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

1137

avahi_simple_poll_quit(simple_poll);

1066

1138

return;

1067

1139

1068

1140

case AVAHI_BROWSER_NEW:

1071

1143

the callback function is called the Avahi server will free the

1072

1144

resolver for us. */

1073

1145

1074

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

1075

name, type, domain, protocol, 0,

1076

resolve_callback, NULL) == NULL)

1146

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

1147

interface, protocol, name, type,

1148

domain, protocol, 0,

1149

resolve_callback, mc) == NULL)

1077

1150

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

1078

1151

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1152

avahi_strerror(avahi_server_errno

1153

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

1080

1154

break;

1081

1155

1082

1156

case AVAHI_BROWSER_REMOVE:

1101

1175

signal_received = sig;

1102

1176

int old_errno = errno;

1103

1177

/* set main loop to exit */

1104

if(mc.simple_poll != NULL){

1105

avahi_simple_poll_quit(mc.simple_poll);

1178

if(simple_poll != NULL){

1179

avahi_simple_poll_quit(simple_poll);

1106

1180

}

1107

1181

errno = old_errno;

1108

1182

}

1109

1183

1184

__attribute__((nonnull, warn_unused_result))

1110

1185

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

1111

1186

int ret;

1187

error_t ret_errno;

1112

1188

1113

1189

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

1114

1190

if(s < 0){

1191

ret_errno = errno;

1115

1192

perror_plus("socket");

1193

errno = ret_errno;

1116

1194

return false;

1117

1195

}

1118

1196

strcpy(ifr->ifr_name, ifname);

1119

1197

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

1198

if(ret == -1){

1121

1199

if(debug){

1200

ret_errno = errno;

1122

1201

perror_plus("ioctl SIOCGIFFLAGS");

1202

errno = ret_errno;

1123

1203

}

1124

1204

return false;

1125

1205

}

1126

1206

return true;

1127

1207

}

1128

1208

1209

__attribute__((nonnull, warn_unused_result))

1129

1210

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

1130

1211

1131

1212

/* Reject the loopback device */

1173

1254

* corresponds to an acceptable network device.

1174

1255

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

1175

1256

*/

1257

__attribute__((nonnull, warn_unused_result))

1176

1258

int good_interface(const struct dirent *if_entry){

1177

1259

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

1178

1260

return 0;

1194

1276

}

1195

1277

1196

1278

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

1237

}

1238

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))

1239

1313

int notdotentries(const struct dirent *direntry){

1240

1314

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

1241

1315

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

1248

1322

}

1249

1323

1250

1324

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

1325

__attribute__((nonnull, warn_unused_result))

1251

1326

int runnable_hook(const struct dirent *direntry){

1252

1327

int ret;

1253

1328

size_t sret;

1261

1336

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

1262

1337

"abcdefghijklmnopqrstuvwxyz"

1263

1338

"0123456789"

1264

"_-");

1339

"_.-");

1265

1340

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

1266

1341

/* Contains non-allowed characters */

1267

1342

if(debug){

1285

1360

}

1286

1361

return 0;

1287

1362

}

1363

free(fullname);

1288

1364

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

1289

1365

/* Not a regular file */

1290

1366

if(debug){

1301

1377

}

1302

1378

return 0;

1303

1379

}

1380

if(debug){

1381

fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",

1382

direntry->d_name);

1383

}

1304

1384

return 1;

1305

1385

}

1306

1386

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1387

__attribute__((nonnull, warn_unused_result))

1388

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1389

mandos_context *mc){

1308

1390

int ret;

1309

1391

struct timespec now;

1310

1392

struct timespec waited_time;

1311

1393

intmax_t block_time;

1312

1394

1313

1395

while(true){

1314

if(mc.current_server == NULL){

1315

if (debug){

1396

if(mc->current_server == NULL){

1397

if(debug){

1316

1398

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

1317

1399

" No timeout!\n");

1318

1400

}

1319

1401

ret = avahi_simple_poll_iterate(s, -1);

1320

1402

} else {

1321

if (debug){

1403

if(debug){

1322

1404

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

1323

1405

" it, or wait\n");

1324

1406

}

1331

1413

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

1332

1414

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

1333

1415

waited_time.tv_sec = (now.tv_sec

1334

- mc.current_server->last_seen.tv_sec);

1416

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

1335

1417

waited_time.tv_nsec = (now.tv_nsec

1336

- mc.current_server->last_seen.tv_nsec);

1418

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

1337

1419

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

1338

1420

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

1339

1421

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

1341

1423

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

1342

1424

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

1343

1425

1344

if (debug){

1426

if(debug){

1345

1427

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

1346

1428

block_time);

1347

1429

}

1348

1430

1349

1431

if(block_time <= 0){

1350

ret = start_mandos_communication(mc.current_server->ip,

1351

mc.current_server->port,

1352

mc.current_server->if_index,

1353

mc.current_server->af);

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);

1354

1436

if(ret == 0){

1355

avahi_simple_poll_quit(mc.simple_poll);

1437

avahi_simple_poll_quit(s);

1356

1438

return 0;

1357

1439

}

1358

1440

ret = clock_gettime(CLOCK_MONOTONIC,

1359

&mc.current_server->last_seen);

1441

&mc->current_server->last_seen);

1360

1442

if(ret == -1){

1361

1443

perror_plus("clock_gettime");

1362

1444

return -1;

1363

1445

}

1364

mc.current_server = mc.current_server->next;

1446

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

1365

1447

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

1366

1448

servers, but don't block */

1367

1449

}

1369

1451

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

1370

1452

}

1371

1453

if(ret != 0){

1372

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

1454

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

1373

1455

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

1374

1456

}

1375

1457

}

1376

1458

}

1377

1459

}

1378

1460

1379

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

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,

1380

1538

const float delay){

1381

1539

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

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

1385

alphasort);

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__ */

1386

1583

if(numhooks == -1){

1387

1584

perror_plus("scandir");

1388

} else {

1389

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

1390

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

1391

direntry = direntries[0];

1392

char *fullname = NULL;

1393

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

1394

if(ret < 0){

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){

1395

1656

perror_plus("asprintf");

1396

continue;

1657

_exit(EX_OSERR);

1397

1658

}

1398

pid_t hook_pid = fork();

1399

if(hook_pid == 0){

1400

/* Child */

1401

dup2(devnull, STDIN_FILENO);

1402

close(devnull);

1403

dup2(STDERR_FILENO, STDOUT_FILENO);

1404

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

1405

if(ret == -1){

1406

perror_plus("setenv");

1407

return false;

1408

}

1409

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

1410

if(ret == -1){

1411

perror_plus("setenv");

1412

return false;

1413

}

1414

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

1415

if(ret == -1){

1416

perror_plus("setenv");

1417

return false;

1418

}

1419

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

1420

if(ret == -1){

1421

perror_plus("setenv");

1422

return false;

1423

}

1424

char *delaystring;

1425

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

1426

if(ret == -1){

1427

perror_plus("asprintf");

1428

return false;

1429

}

1430

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

1431

if(ret == -1){

1432

free(delaystring);

1433

perror_plus("setenv");

1434

return false;

1435

}

1659

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

1660

if(ret == -1){

1436

1661

free(delaystring);

1437

ret = execl(fullname, direntry->d_name, mode, NULL);

1438

perror_plus("execl");

1439

} else {

1440

int status;

1441

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

1442

perror_plus("waitpid");

1443

free(fullname);

1444

continue;

1445

}

1446

if(WIFEXITED(status)){

1447

if(WEXITSTATUS(status) != 0){

1448

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

1449

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

1450

WEXITSTATUS(status));

1451

free(fullname);

1452

continue;

1453

}

1454

} else if(WIFSIGNALED(status)){

1455

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

1456

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

1457

WTERMSIG(status));

1458

free(fullname);

1459

continue;

1460

} else {

1461

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

1462

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

1463

free(fullname);

1464

continue;

1465

}

1466

}

1467

free(fullname);

1468

if(quit_now){

1469

break;

1470

}

1471

}

1472

close(devnull);

1473

}

1474

return true;

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;

1475

1913

}

1476

1914

1477

1915

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 };

1478

1920

AvahiSServiceBrowser *sb = NULL;

1479

int error;

1921

error_t ret_errno;

1480

1922

int ret;

1481

1923

intmax_t tmpmax;

1482

1924

char *tmp;

1483

1925

int exitcode = EXIT_SUCCESS;

1484

const char *interface = "";

1485

struct ifreq network;

1486

int sd = -1;

1487

bool take_down_interface = false;

1488

uid_t uid;

1489

gid_t gid;

1490

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

1491

bool tempdir_created = false;

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;

1492

1931

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1493

1932

const char *seckey = PATHDIR "/" SECKEY;

1494

1933

const char *pubkey = PATHDIR "/" PUBKEY;

1934

char *interfaces_hooks = NULL;

1495

1935

1496

1936

bool gnutls_initialized = false;

1497

1937

bool gpgme_initialized = false;

1559

1999

.group = 2 },

1560

2000

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

1561

2001

.arg = "SECONDS",

1562

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

2002

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

1563

2003

.group = 2 },

1564

2004

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

1565

2005

.arg = "DIR",

1588

2028

connect_to = arg;

1589

2029

break;

1590

2030

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

1591

interface = arg;

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

}

1592

2036

break;

1593

2037

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

1594

2038

seckey = arg;

1637

2081

argp_state_help(state, state->out_stream,

1638

2082

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1639

2083

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

1642

2084

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

1643

2085

exit(argp_err_exit_status);

1644

2086

break;

1672

2114

{

1673

2115

/* Work around Debian bug #633582:

1674

2116

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

1675

struct stat st;

1676

1677

/* Re-raise priviliges */

1678

errno = 0;

1679

ret = seteuid(0);

1680

if(ret == -1){

1681

perror_plus("seteuid");

1682

}

1683

1684

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

1685

int seckey_fd = open(seckey, O_RDONLY);

1686

if(seckey_fd == -1){

1687

perror_plus("open");

1688

} else {

1689

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

1690

if(ret == -1){

1691

perror_plus("fstat");

1692

} else {

1693

if(S_ISREG(st.st_mode)

1694

and st.st_uid == 0 and st.st_gid == 0){

1695

ret = fchown(seckey_fd, uid, gid);

1696

if(ret == -1){

1697

perror_plus("fchown");

1698

}

1699

}

1700

}

1701

TEMP_FAILURE_RETRY(close(seckey_fd));

1702

}

1703

}

1704

1705

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

1706

int pubkey_fd = open(pubkey, O_RDONLY);

1707

if(pubkey_fd == -1){

1708

perror_plus("open");

1709

} else {

1710

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

1711

if(ret == -1){

1712

perror_plus("fstat");

1713

} else {

1714

if(S_ISREG(st.st_mode)

1715

and st.st_uid == 0 and st.st_gid == 0){

1716

ret = fchown(pubkey_fd, uid, gid);

1717

if(ret == -1){

1718

perror_plus("fchown");

1719

}

1720

}

1721

}

1722

TEMP_FAILURE_RETRY(close(pubkey_fd));

1723

}

1724

}

1725

1726

/* Lower privileges */

1727

errno = 0;

1728

ret = seteuid(uid);

1729

if(ret == -1){

1730

perror_plus("seteuid");

2117

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");

2123

} else {

2124

struct stat st;

2125

2126

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

2127

int seckey_fd = open(seckey, O_RDONLY);

2128

if(seckey_fd == -1){

2129

perror_plus("open");

2130

} else {

2131

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

2132

if(ret == -1){

2133

perror_plus("fstat");

2134

} else {

2135

if(S_ISREG(st.st_mode)

2136

and st.st_uid == 0 and st.st_gid == 0){

2137

ret = fchown(seckey_fd, uid, gid);

2138

if(ret == -1){

2139

perror_plus("fchown");

2140

}

2141

}

2142

}

2143

TEMP_FAILURE_RETRY(close(seckey_fd));

2144

}

2145

}

2146

2147

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

2148

int pubkey_fd = open(pubkey, O_RDONLY);

2149

if(pubkey_fd == -1){

2150

perror_plus("open");

2151

} else {

2152

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

2153

if(ret == -1){

2154

perror_plus("fstat");

2155

} else {

2156

if(S_ISREG(st.st_mode)

2157

and st.st_uid == 0 and st.st_gid == 0){

2158

ret = fchown(pubkey_fd, uid, gid);

2159

if(ret == -1){

2160

perror_plus("fchown");

2161

}

2162

}

2163

}

2164

TEMP_FAILURE_RETRY(close(pubkey_fd));

2165

}

2166

}

2167

2168

/* 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;

2190

}

1731

2191

}

1732

2192

}

1733

2193

1734

2194

/* Run network hooks */

1735

2195

{

1736

/* Re-raise priviliges */

1737

errno = 0;

1738

ret = seteuid(0);

1739

if(ret == -1){

1740

perror_plus("seteuid");

1741

}

1742

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

1743

goto end;

1744

}

1745

/* Lower privileges */

1746

errno = 0;

1747

ret = seteuid(uid);

1748

if(ret == -1){

1749

perror_plus("seteuid");

1750

}

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);

1751

2207

}

1752

2208

1753

2209

if(not debug){

1754

2210

avahi_set_log_function(empty_log);

1755

2211

}

1756

2212

1757

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

1758

struct dirent **direntries;

1759

/* First look for interfaces that are up */

1760

ret = scandir(sys_class_net, &direntries, up_interface,

1761

alphasort);

1762

if(ret == 0){

1763

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

1764

free(direntries);

1765

ret = scandir(sys_class_net, &direntries, good_interface,

1766

alphasort);

1767

}

1768

if(ret >= 1){

1769

/* Pick the first interface returned */

1770

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

1771

if(debug){

1772

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

1773

}

1774

if(interface == NULL){

1775

perror_plus("malloc");

1776

free(direntries);

1777

exitcode = EXIT_FAILURE;

1778

goto end;

1779

}

1780

free(direntries);

1781

} else {

1782

free(direntries);

1783

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

1784

exitcode = EXIT_FAILURE;

1785

goto end;

1786

}

1787

}

1788

1789

2213

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

1790

2214

from the signal handler */

1791

2215

/* Initialize the pseudo-RNG for Avahi */

1792

2216

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

1793

mc.simple_poll = avahi_simple_poll_new();

1794

if(mc.simple_poll == NULL){

2217

simple_poll = avahi_simple_poll_new();

2218

if(simple_poll == NULL){

1795

2219

fprintf_plus(stderr,

1796

2220

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

1797

2221

exitcode = EX_UNAVAILABLE;

1861

2285

}

1862

2286

}

1863

2287

1864

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

1865

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

1866

if_index = (AvahiIfIndex) if_nametoindex(interface);

1867

if(if_index == 0){

1868

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

1869

exitcode = EX_UNAVAILABLE;

1870

goto end;

1871

}

1872

1873

if(quit_now){

1874

goto end;

1875

}

1876

1877

/* Re-raise priviliges */

1878

errno = 0;

1879

ret = seteuid(0);

1880

if(ret == -1){

1881

perror_plus("seteuid");

1882

}

1883

1884

#ifdef __linux__

1885

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1886

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

1887

ret = klogctl(8, NULL, 5);

1888

bool restore_loglevel = true;

1889

if(ret == -1){

1890

restore_loglevel = false;

1891

perror_plus("klogctl");

1892

}

1893

#endif /* __linux__ */

1894

1895

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1896

if(sd < 0){

1897

perror_plus("socket");

1898

exitcode = EX_OSERR;

1899

#ifdef __linux__

1900

if(restore_loglevel){

1901

ret = klogctl(7, NULL, 0);

1902

if(ret == -1){

1903

perror_plus("klogctl");

1904

}

1905

}

1906

#endif /* __linux__ */

1907

/* Lower privileges */

1908

errno = 0;

1909

ret = seteuid(uid);

1910

if(ret == -1){

1911

perror_plus("seteuid");

1912

}

1913

goto end;

1914

}

1915

strcpy(network.ifr_name, interface);

1916

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

1917

if(ret == -1){

1918

perror_plus("ioctl SIOCGIFFLAGS");

1919

#ifdef __linux__

1920

if(restore_loglevel){

1921

ret = klogctl(7, NULL, 0);

1922

if(ret == -1){

1923

perror_plus("klogctl");

1924

}

1925

}

1926

#endif /* __linux__ */

1927

exitcode = EX_OSERR;

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1934

goto end;

1935

}

1936

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

1937

network.ifr_flags |= IFF_UP;

1938

take_down_interface = true;

1939

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

1940

if(ret == -1){

1941

take_down_interface = false;

1942

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1943

exitcode = EX_OSERR;

1944

#ifdef __linux__

1945

if(restore_loglevel){

1946

ret = klogctl(7, NULL, 0);

1947

if(ret == -1){

1948

perror_plus("klogctl");

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;

1949

2335

}

1950

2336

}

1951

#endif /* __linux__ */

1952

/* Lower privileges */

1953

errno = 0;

1954

ret = seteuid(uid);

1955

if(ret == -1){

1956

perror_plus("seteuid");

1957

}

1958

goto end;

1959

}

1960

}

1961

/* Sleep checking until interface is running.

1962

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

1963

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

1964

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

1965

if(ret == -1){

1966

perror_plus("ioctl SIOCGIFFLAGS");

1967

} else if(network.ifr_flags & IFF_RUNNING){

1968

2337

break;

1969

2338

}

1970

struct timespec sleeptime = { .tv_nsec = 250000000 };

1971

ret = nanosleep(&sleeptime, NULL);

1972

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

1973

perror_plus("nanosleep");

1974

}

1975

}

1976

if(not take_down_interface){

1977

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

1978

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

1979

if(ret == -1){

1980

perror_plus("close");

1981

}

1982

}

1983

#ifdef __linux__

1984

if(restore_loglevel){

1985

/* Restores kernel loglevel to default */

1986

ret = klogctl(7, NULL, 0);

1987

if(ret == -1){

1988

perror_plus("klogctl");

1989

}

1990

}

1991

#endif /* __linux__ */

1992

/* Lower privileges */

1993

errno = 0;

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

1998

}

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);

1999

2366

}

2000

2367

2001

2368

if(quit_now){

2002

2369

goto end;

2003

2370

}

2004

2371

2005

ret = init_gnutls_global(pubkey, seckey);

2372

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

2006

2373

if(ret == -1){

2007

2374

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

2008

2375

exitcode = EX_UNAVAILABLE;

2015

2382

goto end;

2016

2383

}

2017

2384

2018

if(mkdtemp(tempdir) == NULL){

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){

2019

2395

perror_plus("mkdtemp");

2020

2396

goto end;

2021

2397

}

2022

tempdir_created = true;

2023

2398

2024

2399

if(quit_now){

2025

2400

goto end;

2026

2401

}

2027

2402

2028

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

2403

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

2029

2404

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

2030

2405

exitcode = EX_UNAVAILABLE;

2031

2406

goto end;

2041

2416

/* Connect directly, do not use Zeroconf */

2042

2417

/* (Mainly meant for debugging) */

2043

2418

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

2419

2044

2420

if(address == NULL){

2045

2421

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

2046

2422

exitcode = EX_USAGE;

2051

2427

goto end;

2052

2428

}

2053

2429

2054

uint16_t port;

2430

in_port_t port;

2055

2431

errno = 0;

2056

2432

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

2057

2433

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

2058

or tmpmax != (uint16_t)tmpmax){

2434

or tmpmax != (in_port_t)tmpmax){

2059

2435

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

2060

2436

exitcode = EX_USAGE;

2061

2437

goto end;

2062

2438

}

2063

2439

2064

2440

if(quit_now){

2065

2441

goto end;

2066

2442

}

2067

2443

2068

port = (uint16_t)tmpmax;

2444

port = (in_port_t)tmpmax;

2069

2445

*address = '\0';

2070

2446

/* Colon in address indicates IPv6 */

2071

2447

int af;

2087

2463

}

2088

2464

2089

2465

while(not quit_now){

2090

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

2466

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

2467

&mc);

2091

2468

if(quit_now or ret == 0){

2092

2469

break;

2093

2470

}

2095

2472

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

2096

2473

(int)retry_interval);

2097

2474

}

2098

sleep((int)retry_interval);

2475

sleep((unsigned int)retry_interval);

2099

2476

}

2100

2477

2101

if (not quit_now){

2478

if(not quit_now){

2102

2479

exitcode = EXIT_SUCCESS;

2103

2480

}

2104

2481

2119

2496

config.publish_domain = 0;

2120

2497

2121

2498

/* Allocate a new server */

2122

mc.server = avahi_server_new(avahi_simple_poll_get

2123

(mc.simple_poll), &config, NULL,

2124

NULL, &error);

2499

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2500

&config, NULL, NULL, &ret_errno);

2125

2501

2126

2502

/* Free the Avahi configuration data */

2127

2503

avahi_server_config_free(&config);

2130

2506

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

2131

2507

if(mc.server == NULL){

2132

2508

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

2133

avahi_strerror(error));

2509

avahi_strerror(ret_errno));

2134

2510

exitcode = EX_UNAVAILABLE;

2135

2511

goto end;

2136

2512

}

2142

2518

/* Create the Avahi service browser */

2143

2519

sb = avahi_s_service_browser_new(mc.server, if_index,

2144

2520

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2145

NULL, 0, browse_callback, NULL);

2521

NULL, 0, browse_callback,

2522

(void *)&mc);

2146

2523

if(sb == NULL){

2147

2524

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

2148

2525

avahi_strerror(avahi_server_errno(mc.server)));

2159

2536

if(debug){

2160

2537

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

2161

2538

}

2162

2163

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

(int)(retry_interval * 1000));

2539

2540

ret = avahi_loop_with_timeout(simple_poll,

2541

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

2165

2542

if(debug){

2166

2543

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

2167

2544

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

2174

2551

}

2175

2552

2176

2553

/* Cleanup things */

2554

free(mc.interfaces);

2555

2177

2556

if(sb != NULL)

2178

2557

avahi_s_service_browser_free(sb);

2179

2558

2180

2559

if(mc.server != NULL)

2181

2560

avahi_server_free(mc.server);

2182

2561

2183

if(mc.simple_poll != NULL)

2184

avahi_simple_poll_free(mc.simple_poll);

2562

if(simple_poll != NULL)

2563

avahi_simple_poll_free(simple_poll);

2185

2564

2186

2565

if(gnutls_initialized){

2187

2566

gnutls_certificate_free_credentials(mc.cred);

2192

2571

if(gpgme_initialized){

2193

2572

gpgme_release(mc.ctx);

2194

2573

}

2195

2574

2196

2575

/* Cleans up the circular linked list of Mandos servers the client

2197

2576

has seen */

2198

2577

if(mc.current_server != NULL){

2204

2583

}

2205

2584

}

2206

2585

2207

/* Re-raise priviliges */

2586

/* Re-raise privileges */

2208

2587

{

2209

errno = 0;

2210

ret = seteuid(0);

2211

if(ret == -1){

2212

perror_plus("seteuid");

2213

}

2214

/* Run network hooks */

2215

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

2216

goto end;

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

}

2217

2614

}

2218

2615

2219

/* Take down the network interface */

2220

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

2221

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

2222

if(ret == -1){

2223

perror_plus("ioctl SIOCGIFFLAGS");

2224

} else if(network.ifr_flags & IFF_UP){

2225

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

2226

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

2227

if(ret == -1){

2228

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2229

}

2230

}

2231

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

2232

if(ret == -1){

2233

perror_plus("close");

2234

}

2616

ret_errno = lower_privileges_permanently();

2617

if(ret_errno != 0){

2618

perror_plus("Failed to lower privileges permanently");

2235

2619

}

2236

2620

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2621

2622

free(interfaces_to_take_down);

2623

free(interfaces_hooks);

2243

2624

2244

2625

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

2245

if(tempdir_created){

2626

if(tempdir != NULL){

2246

2627

struct dirent **direntries = NULL;

2247

2628

struct dirent *direntry = NULL;

2248

2629

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

2249

2630

alphasort);

2250

if (numentries > 0){

2631

if(numentries > 0){

2251

2632

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

2252

2633

direntry = direntries[i];

2253

2634

char *fullname = NULL;

2265

2646

free(fullname);

2266

2647

}

2267

2648

}

2268

2649

2269

2650

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

2270

2651

free(direntries);

2271

if (numentries == -1){

2652

if(numentries == -1){

2272

2653

perror_plus("scandir");

2273

2654

}

2274

2655

ret = rmdir(tempdir);