/mandos/trunk : revision 723.1.1

9

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

10

*

11

* Everything else is

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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(),

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stdout, ferror(), remove() */

44

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

43

stdout, ferror() */

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() */

59

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

61

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

61

62

*/

62

63

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

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64

strtoimax() */

64

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

65

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

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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

unlinkat() */

78

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

78

79

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

79

80

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

80

81

argp_state, struct argp,

87

88

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

89

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

89

90

WEXITSTATUS(), WTERMSIG() */

91

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

92

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

93

argz_delete(), argz_append(),

94

argz_stringify(), argz_add(),

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

90

98

91

99

#ifdef __linux__

92

100

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

134

142

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

135

143

char *connect_to = NULL;

136

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

137

148

138

149

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

139

150

typedef struct server{

140

151

const char *ip;

141

uint16_t port;

152

in_port_t port;

142

153

AvahiIfIndex if_index;

143

154

int af;

144

155

struct timespec last_seen;

148

159

149

160

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

150

161

typedef struct {

151

AvahiSimplePoll *simple_poll;

152

162

AvahiServer *server;

153

163

gnutls_certificate_credentials_t cred;

154

164

unsigned int dh_bits;

156

166

const char *priority;

157

167

gpgme_ctx_t ctx;

158

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

159

171

} mandos_context;

160

172

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 };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

166

175

167

176

sig_atomic_t quit_now = 0;

168

177

int signal_received = 0;

169

178

170

179

/* Function to use when printing errors */

171

180

void perror_plus(const char *print_text){

181

int e = errno;

172

182

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

173

183

program_invocation_short_name);

184

errno = e;

174

185

perror(print_text);

175

186

}

176

187

188

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

177

189

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

178

190

va_list ap;

179

191

va_start (ap, format);

180

192

181

193

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

182

194

program_invocation_short_name));

183

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

195

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

184

196

}

185

197

186

198

/*

188

200

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

189

201

* "buffer_length" is how much is already used.

190

202

*/

203

__attribute__((nonnull, warn_unused_result))

191

204

size_t incbuffer(char **buffer, size_t buffer_length,

192

205

size_t buffer_capacity){

193

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

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

195

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

196

213

return 0;

197

214

}

215

*buffer = new_buf;

198

216

buffer_capacity += BUFFER_SIZE;

199

217

}

200

218

return buffer_capacity;

201

219

}

202

220

203

221

/* 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){

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

206

225

int ret;

207

226

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

208

227

if(new_server == NULL){

209

228

perror_plus("malloc");

210

return -1;

229

return false;

211

230

}

212

231

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

213

232

.port = port,

215

234

.af = af };

216

235

if(new_server->ip == NULL){

217

236

perror_plus("strdup");

218

return -1;

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

return false;

219

253

}

220

254

/* Special case of first server */

221

if (mc.current_server == NULL){

255

if(*current_server == NULL){

222

256

new_server->next = new_server;

223

257

new_server->prev = new_server;

224

mc.current_server = new_server;

225

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

258

*current_server = new_server;

226

259

} else {

227

new_server->next = mc.current_server;

228

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

260

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

261

new_server->next = *current_server;

262

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

229

263

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;

264

(*current_server)->prev = new_server;

265

}

266

return true;

238

267

}

239

268

240

269

/*

241

270

* Initialize GPGME.

242

271

*/

243

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

244

const char *tempdir){

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

274

const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

245

277

gpgme_error_t rc;

246

278

gpgme_engine_info_t engine_info;

247

279

248

249

280

/*

250

281

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

251

282

*/

252

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

253

284

int ret;

254

285

int fd;

255

286

gpgme_data_t pgp_data;

267

298

return false;

268

299

}

269

300

270

rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

271

302

if(rc != GPG_ERR_NO_ERROR){

272

303

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

273

304

gpgme_strsource(rc), gpgme_strerror(rc));

317

348

}

318

349

319

350

/* Create new GPGME "context" */

320

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

351

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

321

352

if(rc != GPG_ERR_NO_ERROR){

322

353

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

323

354

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

336

367

* Decrypt OpenPGP data.

337

368

* Returns -1 on error

338

369

*/

370

__attribute__((nonnull, warn_unused_result))

339

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

340

372

size_t crypto_size,

341

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

342

375

gpgme_data_t dh_crypto, dh_plain;

343

376

gpgme_error_t rc;

344

377

ssize_t ret;

370

403

371

404

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

372

405

data buffer */

373

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

406

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

374

407

if(rc != GPG_ERR_NO_ERROR){

375

408

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

376

409

gpgme_strsource(rc), gpgme_strerror(rc));

377

410

plaintext_length = -1;

378

411

if(debug){

379

412

gpgme_decrypt_result_t result;

380

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

381

414

if(result == NULL){

382

415

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

383

416

} else {

460

493

return plaintext_length;

461

494

}

462

495

463

static const char * safer_gnutls_strerror(int value){

464

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

465

-Wunreachable-code */

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

466

499

if(ret == NULL)

467

500

ret = "(unknown)";

468

501

return ret;

469

502

}

470

503

471

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

472

506

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

473

507

const char* string){

474

508

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

475

509

}

476

510

511

__attribute__((nonnull, warn_unused_result))

477

512

static int init_gnutls_global(const char *pubkeyfilename,

478

const char *seckeyfilename){

513

const char *seckeyfilename,

514

mandos_context *mc){

479

515

int ret;

480

516

481

517

if(debug){

498

534

}

499

535

500

536

/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

502

538

if(ret != GNUTLS_E_SUCCESS){

503

539

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

504

540

safer_gnutls_strerror(ret));

514

550

}

515

551

516

552

ret = gnutls_certificate_set_openpgp_key_file

517

(mc.cred, pubkeyfilename, seckeyfilename,

553

(mc->cred, pubkeyfilename, seckeyfilename,

518

554

GNUTLS_OPENPGP_FMT_BASE64);

519

555

if(ret != GNUTLS_E_SUCCESS){

520

556

fprintf_plus(stderr,

526

562

}

527

563

528

564

/* GnuTLS server initialization */

529

ret = gnutls_dh_params_init(&mc.dh_params);

565

ret = gnutls_dh_params_init(&mc->dh_params);

530

566

if(ret != GNUTLS_E_SUCCESS){

531

567

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

568

" initialization: %s\n",

533

569

safer_gnutls_strerror(ret));

534

570

goto globalfail;

535

571

}

536

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

572

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

537

573

if(ret != GNUTLS_E_SUCCESS){

538

574

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

539

575

safer_gnutls_strerror(ret));

540

576

goto globalfail;

541

577

}

542

578

543

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

579

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

544

580

545

581

return 0;

546

582

547

583

globalfail:

548

584

549

gnutls_certificate_free_credentials(mc.cred);

585

gnutls_certificate_free_credentials(mc->cred);

550

586

gnutls_global_deinit();

551

gnutls_dh_params_deinit(mc.dh_params);

587

gnutls_dh_params_deinit(mc->dh_params);

552

588

return -1;

553

589

}

554

590

555

static int init_gnutls_session(gnutls_session_t *session){

591

__attribute__((nonnull, warn_unused_result))

592

static int init_gnutls_session(gnutls_session_t *session,

593

mandos_context *mc){

556

594

int ret;

557

595

/* GnuTLS session creation */

558

596

do {

570

608

{

571

609

const char *err;

572

610

do {

573

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

611

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

574

612

if(quit_now){

575

613

gnutls_deinit(*session);

576

614

return -1;

587

625

588

626

do {

589

627

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

590

mc.cred);

628

mc->cred);

591

629

if(quit_now){

592

630

gnutls_deinit(*session);

593

631

return -1;

603

641

/* ignore client certificate if any. */

604

642

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

605

643

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

607

645

608

646

return 0;

609

647

}

613

651

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

614

652

615

653

/* Called when a Mandos server is found */

616

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

654

__attribute__((nonnull, warn_unused_result))

655

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

617

656

AvahiIfIndex if_index,

618

int af){

657

int af, mandos_context *mc){

619

658

int ret, tcp_sd = -1;

620

659

ssize_t sret;

621

union {

622

struct sockaddr_in in;

623

struct sockaddr_in6 in6;

624

} to;

660

struct sockaddr_storage to;

625

661

char *buffer = NULL;

626

662

char *decrypted_buffer = NULL;

627

663

size_t buffer_length = 0;

651

687

return -1;

652

688

}

653

689

654

ret = init_gnutls_session(&session);

690

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

691

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

692

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

693

bool match = false;

694

{

695

char *interface = NULL;

696

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

697

interface))){

698

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

699

match = true;

700

break;

701

}

702

}

703

}

704

if(not match){

705

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

706

connect to the server */

707

if(debug){

708

char interface[IF_NAMESIZE];

709

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

710

perror_plus("if_indextoname");

711

} else {

712

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

713

" \"%s\"\n",

714

if_indextoname((unsigned int)if_index,

715

interface));

716

}

717

}

718

return -1;

719

}

720

}

721

722

ret = init_gnutls_session(&session, mc);

655

723

if(ret != 0){

656

724

return -1;

657

725

}

658

726

659

727

if(debug){

660

728

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

661

PRIu16 "\n", ip, port);

729

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

662

730

}

663

731

664

732

tcp_sd = socket(pf, SOCK_STREAM, 0);

676

744

677

745

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

678

746

if(af == AF_INET6){

679

to.in6.sin6_family = (sa_family_t)af;

680

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

747

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

748

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

681

749

} else { /* IPv4 */

682

to.in.sin_family = (sa_family_t)af;

683

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

750

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

751

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

684

752

}

685

753

if(ret < 0 ){

686

754

int e = errno;

695

763

goto mandos_end;

696

764

}

697

765

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*/

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

705

769

if(if_index == AVAHI_IF_UNSPEC){

706

770

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

707

771

" incomplete without a network interface\n");

709

773

goto mandos_end;

710

774

}

711

775

/* Set the network interface number as scope */

712

to.in6.sin6_scope_id = (uint32_t)if_index;

776

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

713

777

}

714

778

} else {

715

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

716

-Wconversion and

717

-Wunreachable-code */

779

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

718

780

}

719

781

720

782

if(quit_now){

728

790

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

729

791

perror_plus("if_indextoname");

730

792

} else {

731

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

732

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

793

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

794

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

733

795

}

734

796

} else {

735

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

736

ip, port);

797

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

798

ip, (uintmax_t)port);

737

799

}

738

800

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

801

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

740

const char *pcret;

741

802

if(af == AF_INET6){

742

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

743

sizeof(addrstr));

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

744

807

} else {

745

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

746

sizeof(addrstr));

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

747

812

}

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

}

813

if(ret == EAI_SYSTEM){

814

perror_plus("getnameinfo");

815

} else if(ret != 0) {

816

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

817

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

818

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

754

819

}

755

820

}

756

821

760

825

}

761

826

762

827

if(af == AF_INET6){

763

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

828

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

829

sizeof(struct sockaddr_in6));

764

830

} else {

765

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

831

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

832

sizeof(struct sockaddr_in));

766

833

}

767

834

if(ret < 0){

768

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

835

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

769

836

int e = errno;

770

837

perror_plus("connect");

771

838

errno = e;

817

884

goto mandos_end;

818

885

}

819

886

820

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

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

887

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

888

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

889

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

890

gnutls_transport_set_ptr(session,

891

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

822

892

823

893

if(quit_now){

824

894

errno = EINTR;

929

999

if(buffer_length > 0){

930

1000

ssize_t decrypted_buffer_size;

931

1001

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

932

&decrypted_buffer);

1002

&decrypted_buffer, mc);

933

1003

if(decrypted_buffer_size >= 0){

934

1004

935

1005

written = 0;

983

1053

return retval;

984

1054

}

985

1055

1056

__attribute__((nonnull))

986

1057

static void resolve_callback(AvahiSServiceResolver *r,

987

1058

AvahiIfIndex interface,

988

1059

AvahiProtocol proto,

996

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

997

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

998

1069

flags,

999

AVAHI_GCC_UNUSED void* userdata){

1000

assert(r);

1070

void *mc){

1071

if(r == NULL){

1072

return;

1073

}

1001

1074

1002

1075

/* Called whenever a service has been resolved successfully or

1003

1076

timed out */

1004

1077

1005

1078

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1006

1080

return;

1007

1081

}

1008

1082

1012

1086

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

1013

1087

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

1014

1088

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

1089

avahi_strerror(avahi_server_errno

1090

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

1016

1091

break;

1017

1092

1018

1093

case AVAHI_RESOLVER_FOUND:

1024

1099

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

1025

1100

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

1026

1101

}

1027

int ret = start_mandos_communication(ip, port, interface,

1028

avahi_proto_to_af(proto));

1102

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

1103

interface,

1104

avahi_proto_to_af(proto),

1105

mc);

1029

1106

if(ret == 0){

1030

avahi_simple_poll_quit(mc.simple_poll);

1107

avahi_simple_poll_quit(simple_poll);

1031

1108

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1109

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

1110

avahi_proto_to_af(proto),

1111

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

1112

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

1113

" list\n", name);

1114

}

1034

1115

}

1035

1116

}

1036

1117

}

1046

1127

const char *domain,

1047

1128

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1048

1129

flags,

1049

AVAHI_GCC_UNUSED void* userdata){

1050

assert(b);

1130

void *mc){

1131

if(b == NULL){

1132

return;

1133

}

1051

1134

1052

1135

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

1053

1136

is removed from the LAN */

1061

1144

case AVAHI_BROWSER_FAILURE:

1062

1145

1063

1146

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1065

avahi_simple_poll_quit(mc.simple_poll);

1147

avahi_strerror(avahi_server_errno

1148

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

1149

avahi_simple_poll_quit(simple_poll);

1066

1150

return;

1067

1151

1068

1152

case AVAHI_BROWSER_NEW:

1071

1155

the callback function is called the Avahi server will free the

1072

1156

resolver for us. */

1073

1157

1074

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

1075

name, type, domain, protocol, 0,

1076

resolve_callback, NULL) == NULL)

1158

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

1159

interface, protocol, name, type,

1160

domain, protocol, 0,

1161

resolve_callback, mc) == NULL)

1077

1162

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

1078

1163

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1164

avahi_strerror(avahi_server_errno

1165

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

1080

1166

break;

1081

1167

1082

1168

case AVAHI_BROWSER_REMOVE:

1101

1187

signal_received = sig;

1102

1188

int old_errno = errno;

1103

1189

/* set main loop to exit */

1104

if(mc.simple_poll != NULL){

1105

avahi_simple_poll_quit(mc.simple_poll);

1190

if(simple_poll != NULL){

1191

avahi_simple_poll_quit(simple_poll);

1106

1192

}

1107

1193

errno = old_errno;

1108

1194

}

1109

1195

1196

__attribute__((nonnull, warn_unused_result))

1110

1197

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

1111

1198

int ret;

1199

error_t ret_errno;

1112

1200

1113

1201

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

1114

1202

if(s < 0){

1203

ret_errno = errno;

1115

1204

perror_plus("socket");

1205

errno = ret_errno;

1116

1206

return false;

1117

1207

}

1118

1208

strcpy(ifr->ifr_name, ifname);

1119

1209

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

1210

if(ret == -1){

1121

1211

if(debug){

1212

ret_errno = errno;

1122

1213

perror_plus("ioctl SIOCGIFFLAGS");

1214

errno = ret_errno;

1123

1215

}

1124

1216

return false;

1125

1217

}

1126

1218

return true;

1127

1219

}

1128

1220

1221

__attribute__((nonnull, warn_unused_result))

1129

1222

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

1130

1223

1131

1224

/* Reject the loopback device */

1173

1266

* corresponds to an acceptable network device.

1174

1267

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

1175

1268

*/

1269

__attribute__((nonnull, warn_unused_result))

1176

1270

int good_interface(const struct dirent *if_entry){

1177

1271

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

1178

1272

return 0;

1194

1288

}

1195

1289

1196

1290

/*

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

1291

* This function determines if a network interface is up.

1292

*/

1293

__attribute__((nonnull, warn_unused_result))

1294

bool interface_is_up(const char *interface){

1295

struct ifreq ifr;

1296

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

1297

if(debug){

1298

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

1299

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

1300

}

1301

return false;

1302

}

1303

1304

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

1305

}

1306

1307

/*

1308

* This function determines if a network interface is running

1309

*/

1310

__attribute__((nonnull, warn_unused_result))

1311

bool interface_is_running(const char *interface){

1312

struct ifreq ifr;

1313

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

1314

if(debug){

1315

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

1316

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

1317

}

1318

return false;

1319

}

1320

1321

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

1322

}

1323

1324

__attribute__((nonnull, pure, warn_unused_result))

1239

1325

int notdotentries(const struct dirent *direntry){

1240

1326

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

1241

1327

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

1248

1334

}

1249

1335

1250

1336

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

1337

__attribute__((nonnull, warn_unused_result))

1251

1338

int runnable_hook(const struct dirent *direntry){

1252

1339

int ret;

1253

1340

size_t sret;

1261

1348

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

1262

1349

"abcdefghijklmnopqrstuvwxyz"

1263

1350

"0123456789"

1264

"_-");

1351

"_.-");

1265

1352

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

1266

1353

/* Contains non-allowed characters */

1267

1354

if(debug){

1271

1358

return 0;

1272

1359

}

1273

1360

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1361

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

1282

1362

if(ret == -1){

1283

1363

if(debug){

1284

1364

perror_plus("Could not stat hook");

1308

1388

return 1;

1309

1389

}

1310

1390

1311

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1391

__attribute__((nonnull, warn_unused_result))

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

mandos_context *mc){

1312

1394

int ret;

1313

1395

struct timespec now;

1314

1396

struct timespec waited_time;

1315

1397

intmax_t block_time;

1316

1398

1317

1399

while(true){

1318

if(mc.current_server == NULL){

1319

if (debug){

1400

if(mc->current_server == NULL){

1401

if(debug){

1320

1402

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

1321

1403

" No timeout!\n");

1322

1404

}

1323

1405

ret = avahi_simple_poll_iterate(s, -1);

1324

1406

} else {

1325

if (debug){

1407

if(debug){

1326

1408

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

1327

1409

" it, or wait\n");

1328

1410

}

1335

1417

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

1336

1418

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

1337

1419

waited_time.tv_sec = (now.tv_sec

1338

- mc.current_server->last_seen.tv_sec);

1420

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

1339

1421

waited_time.tv_nsec = (now.tv_nsec

1340

- mc.current_server->last_seen.tv_nsec);

1422

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

1341

1423

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

1342

1424

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

1343

1425

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

1345

1427

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

1346

1428

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

1347

1429

1348

if (debug){

1430

if(debug){

1349

1431

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

1350

1432

block_time);

1351

1433

}

1352

1434

1353

1435

if(block_time <= 0){

1354

ret = start_mandos_communication(mc.current_server->ip,

1355

mc.current_server->port,

1356

mc.current_server->if_index,

1357

mc.current_server->af);

1436

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

1437

mc->current_server->port,

1438

mc->current_server->if_index,

1439

mc->current_server->af, mc);

1358

1440

if(ret == 0){

1359

avahi_simple_poll_quit(mc.simple_poll);

1441

avahi_simple_poll_quit(s);

1360

1442

return 0;

1361

1443

}

1362

1444

ret = clock_gettime(CLOCK_MONOTONIC,

1363

&mc.current_server->last_seen);

1445

&mc->current_server->last_seen);

1364

1446

if(ret == -1){

1365

1447

perror_plus("clock_gettime");

1366

1448

return -1;

1367

1449

}

1368

mc.current_server = mc.current_server->next;

1450

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

1369

1451

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

1370

1452

servers, but don't block */

1371

1453

}

1373

1455

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

1374

1456

}

1375

1457

if(ret != 0){

1376

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

1458

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

1377

1459

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

1378

1460

}

1379

1461

}

1380

1462

}

1381

1463

}

1382

1464

1383

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

1465

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

1466

__attribute__((warn_unused_result))

1467

error_t raise_privileges(void){

1468

error_t old_errno = errno;

1469

error_t ret_errno = 0;

1470

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

1471

ret_errno = errno;

1472

}

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

1477

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

1478

__attribute__((warn_unused_result))

1479

error_t raise_privileges_permanently(void){

1480

error_t old_errno = errno;

1481

error_t ret_errno = raise_privileges();

1482

if(ret_errno != 0){

1483

errno = old_errno;

1484

return ret_errno;

1485

}

1486

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

1487

ret_errno = errno;

1488

}

1489

errno = old_errno;

1490

return ret_errno;

1491

}

1492

1493

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

1494

__attribute__((warn_unused_result))

1495

error_t lower_privileges(void){

1496

error_t old_errno = errno;

1497

error_t ret_errno = 0;

1498

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

1499

ret_errno = errno;

1500

}

1501

errno = old_errno;

1502

return ret_errno;

1503

}

1504

1505

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1507

error_t lower_privileges_permanently(void){

1508

error_t old_errno = errno;

1509

error_t ret_errno = 0;

1510

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

1511

ret_errno = errno;

1512

}

1513

errno = old_errno;

1514

return ret_errno;

1515

}

1516

1517

__attribute__((nonnull))

1518

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

1384

1519

const float delay){

1385

struct dirent **direntries;

1386

struct dirent *direntry;

1387

int ret;

1388

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

1389

alphasort);

1520

struct dirent **direntries = NULL;

1521

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1523

if(hookdir_fd == -1){

1524

if(errno == ENOENT){

1525

if(debug){

1526

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

1527

" found\n", hookdir);

1528

}

1529

} else {

1530

perror_plus("open");

1531

}

1532

return;

1533

}

1534

}

1535

#ifdef __GLIBC__

1536

#if __GLIBC_PREREQ(2, 15)

1537

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

1538

runnable_hook, alphasort);

1539

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

1540

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

1541

alphasort);

1542

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

1543

#else /* not __GLIBC__ */

1544

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

1545

alphasort);

1546

#endif /* not __GLIBC__ */

1390

1547

if(numhooks == -1){

1391

1548

perror_plus("scandir");

1392

} else {

1393

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

1394

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

1395

direntry = direntries[i];

1396

char *fullname = NULL;

1397

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

1398

if(ret < 0){

1549

return;

1550

}

1551

struct dirent *direntry;

1552

int ret;

1553

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

1554

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

1555

direntry = direntries[i];

1556

if(debug){

1557

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

1558

direntry->d_name);

1559

}

1560

pid_t hook_pid = fork();

1561

if(hook_pid == 0){

1562

/* Child */

1563

/* Raise privileges */

1564

errno = raise_privileges_permanently();

1565

if(errno != 0){

1566

perror_plus("Failed to raise privileges");

1567

_exit(EX_NOPERM);

1568

}

1569

/* Set group */

1570

errno = 0;

1571

ret = setgid(0);

1572

if(ret == -1){

1573

perror_plus("setgid");

1574

_exit(EX_NOPERM);

1575

}

1576

/* Reset supplementary groups */

1577

errno = 0;

1578

ret = setgroups(0, NULL);

1579

if(ret == -1){

1580

perror_plus("setgroups");

1581

_exit(EX_NOPERM);

1582

}

1583

ret = dup2(devnull, STDIN_FILENO);

1584

if(ret == -1){

1585

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

1586

_exit(EX_OSERR);

1587

}

1588

ret = close(devnull);

1589

if(ret == -1){

1590

perror_plus("close");

1591

_exit(EX_OSERR);

1592

}

1593

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1594

if(ret == -1){

1595

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

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

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

1604

if(ret == -1){

1605

perror_plus("setenv");

1606

_exit(EX_OSERR);

1607

}

1608

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

1609

if(ret == -1){

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1615

perror_plus("setenv");

1616

_exit(EX_OSERR);

1617

}

1618

char *delaystring;

1619

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

1620

if(ret == -1){

1399

1621

perror_plus("asprintf");

1400

continue;

1401

}

1402

if(debug){

1403

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

1404

direntry->d_name);

1405

}

1406

pid_t hook_pid = fork();

1407

if(hook_pid == 0){

1408

/* Child */

1409

dup2(devnull, STDIN_FILENO);

1410

close(devnull);

1411

dup2(STDERR_FILENO, STDOUT_FILENO);

1412

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

1413

if(ret == -1){

1414

perror_plus("setenv");

1415

return false;

1416

}

1417

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

1418

if(ret == -1){

1419

perror_plus("setenv");

1420

return false;

1421

}

1422

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

1423

if(ret == -1){

1424

perror_plus("setenv");

1425

return false;

1426

}

1427

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

1428

if(ret == -1){

1429

perror_plus("setenv");

1430

return false;

1431

}

1432

char *delaystring;

1433

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

1434

if(ret == -1){

1435

perror_plus("asprintf");

1436

return false;

1437

}

1438

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

1439

if(ret == -1){

1440

free(delaystring);

1441

perror_plus("setenv");

1442

return false;

1443

}

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

1444

1626

free(delaystring);

1445

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

1446

perror_plus("execl");

1447

} else {

1448

int status;

1449

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

1450

perror_plus("waitpid");

1451

free(fullname);

1452

continue;

1453

}

1454

if(WIFEXITED(status)){

1455

if(WEXITSTATUS(status) != 0){

1456

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

1457

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

1458

WEXITSTATUS(status));

1459

free(fullname);

1460

continue;

1461

}

1462

} else if(WIFSIGNALED(status)){

1463

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

1464

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

1465

WTERMSIG(status));

1466

free(fullname);

1467

continue;

1468

} else {

1469

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

1470

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

1471

free(fullname);

1472

continue;

1473

}

1474

}

1475

free(fullname);

1476

if(debug){

1477

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

1478

direntry->d_name);

1479

}

1480

}

1481

close(devnull);

1482

}

1483

return true;

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

free(delaystring);

1631

if(connect_to != NULL){

1632

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

1633

if(ret == -1){

1634

perror_plus("setenv");

1635

_exit(EX_OSERR);

1636

}

1637

}

1638

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

1639

if(hook_fd == -1){

1640

perror_plus("openat");

1641

_exit(EXIT_FAILURE);

1642

}

1643

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

1644

perror_plus("close");

1645

_exit(EXIT_FAILURE);

1646

}

1647

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

1648

environ) == -1){

1649

perror_plus("fexecve");

1650

_exit(EXIT_FAILURE);

1651

}

1652

} else {

1653

int status;

1654

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

1655

perror_plus("waitpid");

1656

free(direntry);

1657

continue;

1658

}

1659

if(WIFEXITED(status)){

1660

if(WEXITSTATUS(status) != 0){

1661

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

1662

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

1663

WEXITSTATUS(status));

1664

free(direntry);

1665

continue;

1666

}

1667

} else if(WIFSIGNALED(status)){

1668

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

1669

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

1670

WTERMSIG(status));

1671

free(direntry);

1672

continue;

1673

} else {

1674

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

1675

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

1676

free(direntry);

1677

continue;

1678

}

1679

}

1680

if(debug){

1681

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

1682

direntry->d_name);

1683

}

1684

free(direntry);

1685

}

1686

free(direntries);

1687

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

1688

perror_plus("close");

1689

} else {

1690

hookdir_fd = -1;

1691

}

1692

close(devnull);

1693

}

1694

1695

__attribute__((nonnull, warn_unused_result))

1696

error_t bring_up_interface(const char *const interface,

1697

const float delay){

1698

error_t old_errno = errno;

1699

int ret;

1700

struct ifreq network;

1701

unsigned int if_index = if_nametoindex(interface);

1702

if(if_index == 0){

1703

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

1704

errno = old_errno;

1705

return ENXIO;

1706

}

1707

1708

if(quit_now){

1709

errno = old_errno;

1710

return EINTR;

1711

}

1712

1713

if(not interface_is_up(interface)){

1714

error_t ret_errno = 0, ioctl_errno = 0;

1715

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

1716

ret_errno = errno;

1717

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

1718

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

1719

errno = old_errno;

1720

return ret_errno;

1721

}

1722

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

1723

1724

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

1725

if(sd == -1){

1726

ret_errno = errno;

1727

perror_plus("socket");

1728

errno = old_errno;

1729

return ret_errno;

1730

}

1731

1732

if(quit_now){

1733

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

1734

if(ret == -1){

1735

perror_plus("close");

1736

}

1737

errno = old_errno;

1738

return EINTR;

1739

}

1740

1741

if(debug){

1742

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

1743

interface);

1744

}

1745

1746

/* Raise privileges */

1747

ret_errno = raise_privileges();

1748

if(ret_errno != 0){

1749

errno = ret_errno;

1750

perror_plus("Failed to raise privileges");

1751

}

1752

1753

#ifdef __linux__

1754

int ret_linux;

1755

bool restore_loglevel = false;

1756

if(ret_errno == 0){

1757

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1758

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

1759

ret_linux = klogctl(8, NULL, 5);

1760

if(ret_linux == -1){

1761

perror_plus("klogctl");

1762

} else {

1763

restore_loglevel = true;

1764

}

1765

}

1766

#endif /* __linux__ */

1767

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

1768

ioctl_errno = errno;

1769

#ifdef __linux__

1770

if(restore_loglevel){

1771

ret_linux = klogctl(7, NULL, 0);

1772

if(ret_linux == -1){

1773

perror_plus("klogctl");

1774

}

1775

}

1776

#endif /* __linux__ */

1777

1778

/* If raise_privileges() succeeded above */

1779

if(ret_errno == 0){

1780

/* Lower privileges */

1781

ret_errno = lower_privileges();

1782

if(ret_errno != 0){

1783

errno = ret_errno;

1784

perror_plus("Failed to lower privileges");

1785

}

1786

}

1787

1788

/* Close the socket */

1789

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

1790

if(ret == -1){

1791

perror_plus("close");

1792

}

1793

1794

if(ret_setflags == -1){

1795

errno = ioctl_errno;

1796

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1797

errno = old_errno;

1798

return ioctl_errno;

1799

}

1800

} else if(debug){

1801

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

1802

interface);

1803

}

1804

1805

/* Sleep checking until interface is running.

1806

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

1807

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

1808

if(interface_is_running(interface)){

1809

break;

1810

}

1811

struct timespec sleeptime = { .tv_nsec = 250000000 };

1812

ret = nanosleep(&sleeptime, NULL);

1813

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

1814

perror_plus("nanosleep");

1815

}

1816

}

1817

1818

errno = old_errno;

1819

return 0;

1820

}

1821

1822

__attribute__((nonnull, warn_unused_result))

1823

error_t take_down_interface(const char *const interface){

1824

error_t old_errno = errno;

1825

struct ifreq network;

1826

unsigned int if_index = if_nametoindex(interface);

1827

if(if_index == 0){

1828

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

1829

errno = old_errno;

1830

return ENXIO;

1831

}

1832

if(interface_is_up(interface)){

1833

error_t ret_errno = 0, ioctl_errno = 0;

1834

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

1835

ret_errno = errno;

1836

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

1837

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

1838

errno = old_errno;

1839

return ret_errno;

1840

}

1841

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

1842

1843

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

1844

if(sd == -1){

1845

ret_errno = errno;

1846

perror_plus("socket");

1847

errno = old_errno;

1848

return ret_errno;

1849

}

1850

1851

if(debug){

1852

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

1853

interface);

1854

}

1855

1856

/* Raise privileges */

1857

ret_errno = raise_privileges();

1858

if(ret_errno != 0){

1859

errno = ret_errno;

1860

perror_plus("Failed to raise privileges");

1861

}

1862

1863

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

1864

ioctl_errno = errno;

1865

1866

/* If raise_privileges() succeeded above */

1867

if(ret_errno == 0){

1868

/* Lower privileges */

1869

ret_errno = lower_privileges();

1870

if(ret_errno != 0){

1871

errno = ret_errno;

1872

perror_plus("Failed to lower privileges");

1873

}

1874

}

1875

1876

/* Close the socket */

1877

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

1878

if(ret == -1){

1879

perror_plus("close");

1880

}

1881

1882

if(ret_setflags == -1){

1883

errno = ioctl_errno;

1884

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1885

errno = old_errno;

1886

return ioctl_errno;

1887

}

1888

} else if(debug){

1889

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

1890

interface);

1891

}

1892

1893

errno = old_errno;

1894

return 0;

1484

1895

}

1485

1896

1486

1897

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

1898

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

1899

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

1900

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

1901

.interfaces = NULL, .interfaces_size = 0 };

1487

1902

AvahiSServiceBrowser *sb = NULL;

1488

int error;

1903

error_t ret_errno;

1489

1904

int ret;

1490

1905

intmax_t tmpmax;

1491

1906

char *tmp;

1492

1907

int exitcode = EXIT_SUCCESS;

1493

const char *interface = "";

1494

struct ifreq network;

1495

int sd = -1;

1496

bool take_down_interface = false;

1497

uid_t uid;

1498

gid_t gid;

1499

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

1500

bool tempdir_created = false;

1908

char *interfaces_to_take_down = NULL;

1909

size_t interfaces_to_take_down_size = 0;

1910

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

1911

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

1912

char *tempdir = NULL;

1501

1913

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1502

1914

const char *seckey = PATHDIR "/" SECKEY;

1503

1915

const char *pubkey = PATHDIR "/" PUBKEY;

1916

char *interfaces_hooks = NULL;

1504

1917

1505

1918

bool gnutls_initialized = false;

1506

1919

bool gpgme_initialized = false;

1568

1981

.group = 2 },

1569

1982

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

1570

1983

.arg = "SECONDS",

1571

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

1984

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

1572

1985

.group = 2 },

1573

1986

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

1574

1987

.arg = "DIR",

1597

2010

connect_to = arg;

1598

2011

break;

1599

2012

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

1600

interface = arg;

2013

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

2014

arg, (int)',');

2015

if(ret_errno != 0){

2016

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

2017

}

1601

2018

break;

1602

2019

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

1603

2020

seckey = arg;

1646

2063

argp_state_help(state, state->out_stream,

1647

2064

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1648

2065

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

1649

fprintf_plus(state->out_stream,

1650

"Mandos plugin mandos-client: ");

1651

2066

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

1652

2067

exit(argp_err_exit_status);

1653

2068

break;

1678

2093

}

1679

2094

}

1680

2095

1681

if(getuid() == 0){

2096

{

1682

2097

/* Work around Debian bug #633582:

1683

2098

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

1684

struct stat st;

1685

1686

/* Re-raise priviliges */

1687

errno = 0;

1688

ret = seteuid(0);

1689

if(ret == -1){

1690

perror_plus("seteuid");

1691

}

1692

1693

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

1694

int seckey_fd = open(seckey, O_RDONLY);

1695

if(seckey_fd == -1){

1696

perror_plus("open");

1697

} else {

1698

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

1699

if(ret == -1){

1700

perror_plus("fstat");

1701

} else {

1702

if(S_ISREG(st.st_mode)

1703

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

1704

ret = fchown(seckey_fd, uid, gid);

1705

if(ret == -1){

1706

perror_plus("fchown");

1707

}

1708

}

1709

}

1710

TEMP_FAILURE_RETRY(close(seckey_fd));

1711

}

1712

}

1713

1714

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

1715

int pubkey_fd = open(pubkey, O_RDONLY);

1716

if(pubkey_fd == -1){

1717

perror_plus("open");

1718

} else {

1719

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

1720

if(ret == -1){

1721

perror_plus("fstat");

1722

} else {

1723

if(S_ISREG(st.st_mode)

1724

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

1725

ret = fchown(pubkey_fd, uid, gid);

1726

if(ret == -1){

1727

perror_plus("fchown");

1728

}

1729

}

1730

}

1731

TEMP_FAILURE_RETRY(close(pubkey_fd));

1732

}

1733

}

1734

1735

/* Lower privileges */

1736

errno = 0;

1737

ret = seteuid(uid);

1738

if(ret == -1){

1739

perror_plus("seteuid");

2099

2100

/* Re-raise privileges */

2101

ret_errno = raise_privileges();

2102

if(ret_errno != 0){

2103

errno = ret_errno;

2104

perror_plus("Failed to raise privileges");

2105

} else {

2106

struct stat st;

2107

2108

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

2109

int seckey_fd = open(seckey, O_RDONLY);

2110

if(seckey_fd == -1){

2111

perror_plus("open");

2112

} else {

2113

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

2114

if(ret == -1){

2115

perror_plus("fstat");

2116

} else {

2117

if(S_ISREG(st.st_mode)

2118

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

2119

ret = fchown(seckey_fd, uid, gid);

2120

if(ret == -1){

2121

perror_plus("fchown");

2122

}

2123

}

2124

}

2125

TEMP_FAILURE_RETRY(close(seckey_fd));

2126

}

2127

}

2128

2129

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

2130

int pubkey_fd = open(pubkey, O_RDONLY);

2131

if(pubkey_fd == -1){

2132

perror_plus("open");

2133

} else {

2134

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

2135

if(ret == -1){

2136

perror_plus("fstat");

2137

} else {

2138

if(S_ISREG(st.st_mode)

2139

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

2140

ret = fchown(pubkey_fd, uid, gid);

2141

if(ret == -1){

2142

perror_plus("fchown");

2143

}

2144

}

2145

}

2146

TEMP_FAILURE_RETRY(close(pubkey_fd));

2147

}

2148

}

2149

2150

/* Lower privileges */

2151

ret_errno = lower_privileges();

2152

if(ret_errno != 0){

2153

errno = ret_errno;

2154

perror_plus("Failed to lower privileges");

2155

}

2156

}

2157

}

2158

2159

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

2160

{

2161

char *interface = NULL;

2162

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

2163

interface))){

2164

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

2165

and if_nametoindex(interface) == 0){

2166

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

2167

fprintf_plus(stderr, "Not using nonexisting interface"

2168

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

2169

}

2170

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

2171

interface = NULL;

2172

}

1740

2173

}

1741

2174

}

1742

2175

1743

2176

/* Run network hooks */

1744

2177

{

1745

if(getuid() == 0){

1746

/* Re-raise priviliges */

1747

errno = 0;

1748

ret = seteuid(0);

1749

if(ret == -1){

1750

perror_plus("seteuid");

1751

}

1752

}

1753

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

1754

goto end;

1755

}

1756

if(getuid() == 0){

1757

/* Lower privileges */

1758

errno = 0;

1759

ret = seteuid(uid);

1760

if(ret == -1){

1761

perror_plus("seteuid");

1762

}

1763

}

2178

if(mc.interfaces != NULL){

2179

interfaces_hooks = malloc(mc.interfaces_size);

2180

if(interfaces_hooks == NULL){

2181

perror_plus("malloc");

2182

goto end;

2183

}

2184

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

2185

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

2186

}

2187

run_network_hooks("start", interfaces_hooks != NULL ?

2188

interfaces_hooks : "", delay);

1764

2189

}

1765

2190

1766

2191

if(not debug){

1767

2192

avahi_set_log_function(empty_log);

1768

2193

}

1769

2194

1770

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

1771

struct dirent **direntries;

1772

/* First look for interfaces that are up */

1773

ret = scandir(sys_class_net, &direntries, up_interface,

1774

alphasort);

1775

if(ret == 0){

1776

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

1777

free(direntries);

1778

ret = scandir(sys_class_net, &direntries, good_interface,

1779

alphasort);

1780

}

1781

if(ret >= 1){

1782

/* Pick the first interface returned */

1783

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

1784

if(debug){

1785

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

1786

}

1787

if(interface == NULL){

1788

perror_plus("malloc");

1789

free(direntries);

1790

exitcode = EXIT_FAILURE;

1791

goto end;

1792

}

1793

free(direntries);

1794

} else {

1795

free(direntries);

1796

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

1797

exitcode = EXIT_FAILURE;

1798

goto end;

1799

}

1800

}

1801

1802

2195

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

1803

2196

from the signal handler */

1804

2197

/* Initialize the pseudo-RNG for Avahi */

1805

2198

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

1806

mc.simple_poll = avahi_simple_poll_new();

1807

if(mc.simple_poll == NULL){

2199

simple_poll = avahi_simple_poll_new();

2200

if(simple_poll == NULL){

1808

2201

fprintf_plus(stderr,

1809

2202

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

1810

2203

exitcode = EX_UNAVAILABLE;

1874

2267

}

1875

2268

}

1876

2269

1877

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

1878

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

1879

if_index = (AvahiIfIndex) if_nametoindex(interface);

1880

if(if_index == 0){

1881

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

1882

exitcode = EX_UNAVAILABLE;

1883

goto end;

1884

}

1885

1886

if(quit_now){

1887

goto end;

1888

}

1889

1890

/* Re-raise priviliges */

1891

errno = 0;

1892

ret = seteuid(0);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

1897

#ifdef __linux__

1898

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1899

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

1900

ret = klogctl(8, NULL, 5);

1901

bool restore_loglevel = true;

1902

if(ret == -1){

1903

restore_loglevel = false;

1904

perror_plus("klogctl");

1905

}

1906

#endif /* __linux__ */

1907

1908

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1909

if(sd < 0){

1910

perror_plus("socket");

1911

exitcode = EX_OSERR;

1912

#ifdef __linux__

1913

if(restore_loglevel){

1914

ret = klogctl(7, NULL, 0);

1915

if(ret == -1){

1916

perror_plus("klogctl");

1917

}

1918

}

1919

#endif /* __linux__ */

1920

/* Lower privileges */

1921

errno = 0;

1922

ret = seteuid(uid);

1923

if(ret == -1){

1924

perror_plus("seteuid");

1925

}

1926

goto end;

1927

}

1928

strcpy(network.ifr_name, interface);

1929

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

1930

if(ret == -1){

1931

perror_plus("ioctl SIOCGIFFLAGS");

1932

#ifdef __linux__

1933

if(restore_loglevel){

1934

ret = klogctl(7, NULL, 0);

1935

if(ret == -1){

1936

perror_plus("klogctl");

1937

}

1938

}

1939

#endif /* __linux__ */

1940

exitcode = EX_OSERR;

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

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

1950

network.ifr_flags |= IFF_UP;

1951

take_down_interface = true;

1952

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

1953

if(ret == -1){

1954

take_down_interface = false;

1955

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1956

exitcode = EX_OSERR;

1957

#ifdef __linux__

1958

if(restore_loglevel){

1959

ret = klogctl(7, NULL, 0);

1960

if(ret == -1){

1961

perror_plus("klogctl");

2270

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

2271

if(mc.interfaces == NULL){

2272

struct dirent **direntries = NULL;

2273

/* Look for any good interfaces */

2274

ret = scandir(sys_class_net, &direntries, good_interface,

2275

alphasort);

2276

if(ret >= 1){

2277

/* Add all found interfaces to interfaces list */

2278

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

2279

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

2280

direntries[i]->d_name);

2281

if(ret_errno != 0){

2282

errno = ret_errno;

2283

perror_plus("argz_add");

2284

free(direntries[i]);

2285

continue;

2286

}

2287

if(debug){

2288

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

2289

direntries[i]->d_name);

2290

}

2291

free(direntries[i]);

2292

}

2293

free(direntries);

2294

} else {

2295

if(ret == 0){

2296

free(direntries);

2297

}

2298

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

2299

exitcode = EXIT_FAILURE;

2300

goto end;

2301

}

2302

}

2303

2304

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

2305

{

2306

char *interface = NULL;

2307

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

2308

interface))){

2309

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

2310

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

2311

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

2312

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

2313

interface);

2314

interface = NULL;

2315

while((interface = argz_next(mc.interfaces,

2316

mc.interfaces_size, interface))){

2317

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

2318

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

2319

interface);

2320

interface = NULL;

1962

2321

}

1963

2322

}

1964

#endif /* __linux__ */

1965

/* Lower privileges */

1966

errno = 0;

1967

ret = seteuid(uid);

1968

if(ret == -1){

1969

perror_plus("seteuid");

1970

}

1971

goto end;

1972

}

1973

}

1974

/* Sleep checking until interface is running.

1975

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

1976

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

1977

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

1978

if(ret == -1){

1979

perror_plus("ioctl SIOCGIFFLAGS");

1980

} else if(network.ifr_flags & IFF_RUNNING){

1981

2323

break;

1982

2324

}

1983

struct timespec sleeptime = { .tv_nsec = 250000000 };

1984

ret = nanosleep(&sleeptime, NULL);

1985

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

1986

perror_plus("nanosleep");

1987

}

1988

}

1989

if(not take_down_interface){

1990

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

1991

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

1992

if(ret == -1){

1993

perror_plus("close");

1994

}

1995

}

1996

#ifdef __linux__

1997

if(restore_loglevel){

1998

/* Restores kernel loglevel to default */

1999

ret = klogctl(7, NULL, 0);

2000

if(ret == -1){

2001

perror_plus("klogctl");

2002

}

2003

}

2004

#endif /* __linux__ */

2005

/* Lower privileges */

2006

errno = 0;

2007

/* Lower privileges */

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

2011

}

2325

bool interface_was_up = interface_is_up(interface);

2326

errno = bring_up_interface(interface, delay);

2327

if(not interface_was_up){

2328

if(errno != 0){

2329

perror_plus("Failed to bring up interface");

2330

} else {

2331

errno = argz_add(&interfaces_to_take_down,

2332

&interfaces_to_take_down_size,

2333

interface);

2334

if(errno != 0){

2335

perror_plus("argz_add");

2336

}

2337

}

2338

}

2339

}

2340

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

2341

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

2342

}

2343

}

2344

2345

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

2346

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

2347

if(debug){

2348

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

2349

mc.interfaces);

2350

}

2351

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

2012

2352

}

2013

2353

2014

2354

if(quit_now){

2015

2355

goto end;

2016

2356

}

2017

2357

2018

ret = init_gnutls_global(pubkey, seckey);

2358

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

2019

2359

if(ret == -1){

2020

2360

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

2021

2361

exitcode = EX_UNAVAILABLE;

2028

2368

goto end;

2029

2369

}

2030

2370

2031

if(mkdtemp(tempdir) == NULL){

2371

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

2372

tempdir = mkdtemp(run_tempdir);

2373

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

2374

if(debug){

2375

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

2376

run_tempdir, old_tempdir);

2377

}

2378

tempdir = mkdtemp(old_tempdir);

2379

}

2380

if(tempdir == NULL){

2032

2381

perror_plus("mkdtemp");

2033

2382

goto end;

2034

2383

}

2035

tempdir_created = true;

2036

2384

2037

2385

if(quit_now){

2038

2386

goto end;

2039

2387

}

2040

2388

2041

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

2389

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

2042

2390

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

2043

2391

exitcode = EX_UNAVAILABLE;

2044

2392

goto end;

2054

2402

/* Connect directly, do not use Zeroconf */

2055

2403

/* (Mainly meant for debugging) */

2056

2404

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

2405

2057

2406

if(address == NULL){

2058

2407

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

2059

2408

exitcode = EX_USAGE;

2064

2413

goto end;

2065

2414

}

2066

2415

2067

uint16_t port;

2416

in_port_t port;

2068

2417

errno = 0;

2069

2418

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

2070

2419

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

2071

or tmpmax != (uint16_t)tmpmax){

2420

or tmpmax != (in_port_t)tmpmax){

2072

2421

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

2073

2422

exitcode = EX_USAGE;

2074

2423

goto end;

2075

2424

}

2076

2425

2077

2426

if(quit_now){

2078

2427

goto end;

2079

2428

}

2080

2429

2081

port = (uint16_t)tmpmax;

2430

port = (in_port_t)tmpmax;

2082

2431

*address = '\0';

2083

2432

/* Colon in address indicates IPv6 */

2084

2433

int af;

2100

2449

}

2101

2450

2102

2451

while(not quit_now){

2103

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

2452

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

2453

&mc);

2104

2454

if(quit_now or ret == 0){

2105

2455

break;

2106

2456

}

2108

2458

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

2109

2459

(int)retry_interval);

2110

2460

}

2111

sleep((int)retry_interval);

2461

sleep((unsigned int)retry_interval);

2112

2462

}

2113

2463

2114

if (not quit_now){

2464

if(not quit_now){

2115

2465

exitcode = EXIT_SUCCESS;

2116

2466

}

2117

2467

2132

2482

config.publish_domain = 0;

2133

2483

2134

2484

/* Allocate a new server */

2135

mc.server = avahi_server_new(avahi_simple_poll_get

2136

(mc.simple_poll), &config, NULL,

2137

NULL, &error);

2485

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2486

&config, NULL, NULL, &ret_errno);

2138

2487

2139

2488

/* Free the Avahi configuration data */

2140

2489

avahi_server_config_free(&config);

2143

2492

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

2144

2493

if(mc.server == NULL){

2145

2494

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

2146

avahi_strerror(error));

2495

avahi_strerror(ret_errno));

2147

2496

exitcode = EX_UNAVAILABLE;

2148

2497

goto end;

2149

2498

}

2155

2504

/* Create the Avahi service browser */

2156

2505

sb = avahi_s_service_browser_new(mc.server, if_index,

2157

2506

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2158

NULL, 0, browse_callback, NULL);

2507

NULL, 0, browse_callback,

2508

(void *)&mc);

2159

2509

if(sb == NULL){

2160

2510

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

2161

2511

avahi_strerror(avahi_server_errno(mc.server)));

2172

2522

if(debug){

2173

2523

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

2174

2524

}

2175

2176

ret = avahi_loop_with_timeout(mc.simple_poll,

2177

(int)(retry_interval * 1000));

2525

2526

ret = avahi_loop_with_timeout(simple_poll,

2527

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

2178

2528

if(debug){

2179

2529

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

2180

2530

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

2187

2537

}

2188

2538

2189

2539

/* Cleanup things */

2540

free(mc.interfaces);

2541

2190

2542

if(sb != NULL)

2191

2543

avahi_s_service_browser_free(sb);

2192

2544

2193

2545

if(mc.server != NULL)

2194

2546

avahi_server_free(mc.server);

2195

2547

2196

if(mc.simple_poll != NULL)

2197

avahi_simple_poll_free(mc.simple_poll);

2548

if(simple_poll != NULL)

2549

avahi_simple_poll_free(simple_poll);

2198

2550

2199

2551

if(gnutls_initialized){

2200

2552

gnutls_certificate_free_credentials(mc.cred);

2212

2564

mc.current_server->prev->next = NULL;

2213

2565

while(mc.current_server != NULL){

2214

2566

server *next = mc.current_server->next;

2567

#ifdef __GNUC__

2568

#pragma GCC diagnostic push

2569

#pragma GCC diagnostic ignored "-Wcast-qual"

2570

#endif

2571

free((char *)(mc.current_server->ip));

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic pop

2574

#endif

2215

2575

free(mc.current_server);

2216

2576

mc.current_server = next;

2217

2577

}

2218

2578

}

2219

2579

2220

/* Re-raise priviliges */

2580

/* Re-raise privileges */

2221

2581

{

2222

if(getuid() == 0){

2223

errno = 0;

2224

ret = seteuid(0);

2225

if(ret == -1){

2226

perror_plus("seteuid");

2227

}

2228

}

2229

2230

/* Run network hooks */

2231

run_network_hooks("stop", interface, delay);

2232

2233

/* Take down the network interface */

2234

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

2235

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

2236

if(ret == -1){

2237

perror_plus("ioctl SIOCGIFFLAGS");

2238

} else if(network.ifr_flags & IFF_UP){

2239

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

2240

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

2241

if(ret == -1){

2242

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2243

}

2244

}

2245

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

2246

if(ret == -1){

2247

perror_plus("close");

2248

}

2249

}

2250

}

2251

if(getuid() == 0){

2252

/* Lower privileges permanently */

2253

errno = 0;

2254

ret = setuid(uid);

2255

if(ret == -1){

2256

perror_plus("setuid");

2257

}

2258

}

2582

ret_errno = raise_privileges();

2583

if(ret_errno != 0){

2584

errno = ret_errno;

2585

perror_plus("Failed to raise privileges");

2586

} else {

2587

2588

/* Run network hooks */

2589

run_network_hooks("stop", interfaces_hooks != NULL ?

2590

interfaces_hooks : "", delay);

2591

2592

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

2593

{

2594

char *interface = NULL;

2595

while((interface=argz_next(interfaces_to_take_down,

2596

interfaces_to_take_down_size,

2597

interface))){

2598

ret_errno = take_down_interface(interface);

2599

if(ret_errno != 0){

2600

errno = ret_errno;

2601

perror_plus("Failed to take down interface");

2602

}

2603

}

2604

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

2605

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

2606

" down\n");

2607

}

2608

}

2609

}

2610

2611

ret_errno = lower_privileges_permanently();

2612

if(ret_errno != 0){

2613

errno = ret_errno;

2614

perror_plus("Failed to lower privileges permanently");

2615

}

2616

}

2617

2618

free(interfaces_to_take_down);

2619

free(interfaces_hooks);

2259

2620

2260

2621

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

2261

if(tempdir_created){

2622

if(tempdir != NULL){

2262

2623

struct dirent **direntries = NULL;

2263

struct dirent *direntry = NULL;

2264

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

2265

alphasort);

2266

if (numentries > 0){

2267

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

2268

direntry = direntries[i];

2269

char *fullname = NULL;

2270

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

2271

direntry->d_name);

2272

if(ret < 0){

2273

perror_plus("asprintf");

2274

continue;

2275

}

2276

ret = remove(fullname);

2277

if(ret == -1){

2278

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

2279

strerror(errno));

2280

}

2281

free(fullname);

2624

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

2625

O_NOFOLLOW));

2626

if(tempdir_fd == -1){

2627

perror_plus("open");

2628

} else {

2629

#ifdef __GLIBC__

2630

#if __GLIBC_PREREQ(2, 15)

2631

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

2632

notdotentries, alphasort);

2633

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

2634

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

2635

alphasort);

2636

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

2637

#else /* not __GLIBC__ */

2638

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

2639

alphasort);

2640

#endif /* not __GLIBC__ */

2641

if(numentries >= 0){

2642

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

2643

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

2644

if(ret == -1){

2645

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

2646

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

2647

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

2648

}

2649

free(direntries[i]);

2650

}

2651

2652

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

2653

free(direntries);

2654

if(numentries == -1){

2655

perror_plus("scandir");

2656

}

2657

ret = rmdir(tempdir);

2658

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

2659

perror_plus("rmdir");

2660

}

2282

2661

}

2283

}

2284

2285

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

2286

free(direntries);

2287

if (numentries == -1){

2288

perror_plus("scandir");

2289

}

2290

ret = rmdir(tempdir);

2291

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

2292

perror_plus("rmdir");

2662

TEMP_FAILURE_RETRY(close(tempdir_fd));

2293

2663

}

2294

2664

}

2295

2665