/mandos/release : revision 237.16.15

9

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

10

*

11

* Everything else is

12

13

12

13

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*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

41

42

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

43

stdout, ferror() */

44

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

43

stdout, ferror(), remove() */

44

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

45

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

46

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

47

strtof(), abort() */

55

opendir(), DIR */

56

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

57

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

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inet_pton(), connect(),

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getnameinfo() */

60

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

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inet_pton(), connect() */

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

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60

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

62

61

*/

63

62

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

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63

strtoimax() */

64

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

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

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program_invocation_short_name */

67

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

73

*/

74

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

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

76

setgid(), pause(), _exit(),

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unlinkat() */

78

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

76

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

77

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

79

78

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

80

79

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

81

80

argp_state, struct argp,

88

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

89

88

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

90

89

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() */

98

90

99

91

#ifdef __linux__

100

92

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

142

134

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

143

135

char *connect_to = NULL;

144

136

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

148

137

149

138

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

150

139

typedef struct server{

151

140

const char *ip;

152

in_port_t port;

141

uint16_t port;

153

142

AvahiIfIndex if_index;

154

143

int af;

155

144

struct timespec last_seen;

159

148

160

149

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

161

150

typedef struct {

151

AvahiSimplePoll *simple_poll;

162

152

AvahiServer *server;

163

153

gnutls_certificate_credentials_t cred;

164

154

unsigned int dh_bits;

166

156

const char *priority;

167

157

gpgme_ctx_t ctx;

168

158

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

159

} mandos_context;

172

160

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

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 };

175

166

176

167

sig_atomic_t quit_now = 0;

177

168

int signal_received = 0;

178

169

179

170

/* Function to use when printing errors */

180

171

void perror_plus(const char *print_text){

181

int e = errno;

182

172

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

183

173

program_invocation_short_name);

184

errno = e;

185

174

perror(print_text);

186

175

}

187

176

188

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

189

177

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

190

178

va_list ap;

191

179

va_start (ap, format);

192

180

193

181

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

194

182

program_invocation_short_name));

195

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

183

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

196

184

}

197

185

198

186

/*

200

188

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

201

189

* "buffer_length" is how much is already used.

202

190

*/

203

__attribute__((nonnull, warn_unused_result))

204

191

size_t incbuffer(char **buffer, size_t buffer_length,

205

192

size_t buffer_capacity){

206

193

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

194

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

195

if(buffer == NULL){

213

196

return 0;

214

197

}

215

*buffer = new_buf;

216

198

buffer_capacity += BUFFER_SIZE;

217

199

}

218

200

return buffer_capacity;

219

201

}

220

202

221

203

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

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

204

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

205

int af){

225

206

int ret;

226

207

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

227

208

if(new_server == NULL){

228

209

perror_plus("malloc");

229

return false;

210

return -1;

230

211

}

231

212

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

232

213

.port = port,

234

215

.af = af };

235

216

if(new_server->ip == NULL){

236

217

perror_plus("strdup");

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

free(new_server->ip);

244

free(new_server);

245

return false;

218

return -1;

246

219

}

247

220

/* Special case of first server */

248

if(*current_server == NULL){

221

if (mc.current_server == NULL){

249

222

new_server->next = new_server;

250

223

new_server->prev = new_server;

251

*current_server = new_server;

224

mc.current_server = new_server;

225

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

252

226

} else {

253

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

254

new_server->next = *current_server;

255

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

227

new_server->next = mc.current_server;

228

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

256

229

new_server->prev->next = new_server;

257

(*current_server)->prev = new_server;

258

}

259

return true;

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;

260

238

}

261

239

262

240

/*

263

241

* Initialize GPGME.

264

242

*/

265

__attribute__((nonnull, warn_unused_result))

266

static bool init_gpgme(const char * const seckey,

267

const char * const pubkey,

268

const char * const tempdir,

269

mandos_context *mc){

243

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

244

const char *tempdir){

270

245

gpgme_error_t rc;

271

246

gpgme_engine_info_t engine_info;

272

247

248

273

249

/*

274

250

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

275

251

*/

276

bool import_key(const char * const filename){

252

bool import_key(const char *filename){

277

253

int ret;

278

254

int fd;

279

255

gpgme_data_t pgp_data;

291

267

return false;

292

268

}

293

269

294

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

270

rc = gpgme_op_import(mc.ctx, pgp_data);

295

271

if(rc != GPG_ERR_NO_ERROR){

296

272

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

297

273

gpgme_strsource(rc), gpgme_strerror(rc));

341

317

}

342

318

343

319

/* Create new GPGME "context" */

344

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

320

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

345

321

if(rc != GPG_ERR_NO_ERROR){

346

322

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

347

323

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

360

336

* Decrypt OpenPGP data.

361

337

* Returns -1 on error

362

338

*/

363

__attribute__((nonnull, warn_unused_result))

364

339

static ssize_t pgp_packet_decrypt(const char *cryptotext,

365

340

size_t crypto_size,

366

char **plaintext,

367

mandos_context *mc){

341

char **plaintext){

368

342

gpgme_data_t dh_crypto, dh_plain;

369

343

gpgme_error_t rc;

370

344

ssize_t ret;

396

370

397

371

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

398

372

data buffer */

399

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

373

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

400

374

if(rc != GPG_ERR_NO_ERROR){

401

375

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

402

376

gpgme_strsource(rc), gpgme_strerror(rc));

403

377

plaintext_length = -1;

404

378

if(debug){

405

379

gpgme_decrypt_result_t result;

406

result = gpgme_op_decrypt_result(mc->ctx);

380

result = gpgme_op_decrypt_result(mc.ctx);

407

381

if(result == NULL){

408

382

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

409

383

} else {

486

460

return plaintext_length;

487

461

}

488

462

489

__attribute__((warn_unused_result))

490

static const char *safer_gnutls_strerror(int value){

491

const char *ret = gnutls_strerror(value);

463

static const char * safer_gnutls_strerror(int value){

464

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

465

-Wunreachable-code */

492

466

if(ret == NULL)

493

467

ret = "(unknown)";

494

468

return ret;

495

469

}

496

470

497

471

/* GnuTLS log function callback */

498

__attribute__((nonnull))

499

472

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

500

473

const char* string){

501

474

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

502

475

}

503

476

504

__attribute__((nonnull, warn_unused_result))

505

477

static int init_gnutls_global(const char *pubkeyfilename,

506

const char *seckeyfilename,

507

mandos_context *mc){

478

const char *seckeyfilename){

508

479

int ret;

509

480

510

481

if(debug){

527

498

}

528

499

529

500

/* OpenPGP credentials */

530

ret = gnutls_certificate_allocate_credentials(&mc->cred);

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

531

502

if(ret != GNUTLS_E_SUCCESS){

532

503

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

533

504

safer_gnutls_strerror(ret));

543

514

}

544

515

545

516

ret = gnutls_certificate_set_openpgp_key_file

546

(mc->cred, pubkeyfilename, seckeyfilename,

517

(mc.cred, pubkeyfilename, seckeyfilename,

547

518

GNUTLS_OPENPGP_FMT_BASE64);

548

519

if(ret != GNUTLS_E_SUCCESS){

549

520

fprintf_plus(stderr,

555

526

}

556

527

557

528

/* GnuTLS server initialization */

558

ret = gnutls_dh_params_init(&mc->dh_params);

529

ret = gnutls_dh_params_init(&mc.dh_params);

559

530

if(ret != GNUTLS_E_SUCCESS){

560

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

561

532

" initialization: %s\n",

562

533

safer_gnutls_strerror(ret));

563

534

goto globalfail;

564

535

}

565

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

536

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

566

537

if(ret != GNUTLS_E_SUCCESS){

567

538

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

568

539

safer_gnutls_strerror(ret));

569

540

goto globalfail;

570

541

}

571

542

572

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

543

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

573

544

574

545

return 0;

575

546

576

547

globalfail:

577

548

578

gnutls_certificate_free_credentials(mc->cred);

549

gnutls_certificate_free_credentials(mc.cred);

579

550

gnutls_global_deinit();

580

gnutls_dh_params_deinit(mc->dh_params);

551

gnutls_dh_params_deinit(mc.dh_params);

581

552

return -1;

582

553

}

583

554

584

__attribute__((nonnull, warn_unused_result))

585

static int init_gnutls_session(gnutls_session_t *session,

586

mandos_context *mc){

555

static int init_gnutls_session(gnutls_session_t *session){

587

556

int ret;

588

557

/* GnuTLS session creation */

589

558

do {

601

570

{

602

571

const char *err;

603

572

do {

604

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

573

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

605

574

if(quit_now){

606

575

gnutls_deinit(*session);

607

576

return -1;

618

587

619

588

do {

620

589

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

621

mc->cred);

590

mc.cred);

622

591

if(quit_now){

623

592

gnutls_deinit(*session);

624

593

return -1;

634

603

/* ignore client certificate if any. */

635

604

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

636

605

637

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

638

607

639

608

return 0;

640

609

}

644

613

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

645

614

646

615

/* Called when a Mandos server is found */

647

__attribute__((nonnull, warn_unused_result))

648

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

616

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

649

617

AvahiIfIndex if_index,

650

int af, mandos_context *mc){

618

int af){

651

619

int ret, tcp_sd = -1;

652

620

ssize_t sret;

653

struct sockaddr_storage to;

621

union {

622

struct sockaddr_in in;

623

struct sockaddr_in6 in6;

624

} to;

654

625

char *buffer = NULL;

655

626

char *decrypted_buffer = NULL;

656

627

size_t buffer_length = 0;

680

651

return -1;

681

652

}

682

653

683

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

684

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

685

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

686

bool match = false;

687

{

688

char *interface = NULL;

689

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

690

interface))){

691

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

692

match = true;

693

break;

694

}

695

}

696

}

697

if(not match){

698

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

699

connect to the server */

700

if(debug){

701

char interface[IF_NAMESIZE];

702

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

703

perror_plus("if_indextoname");

704

} else {

705

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

706

" \"%s\"\n",

707

if_indextoname((unsigned int)if_index,

708

interface));

709

}

710

}

711

return -1;

712

}

713

}

714

715

ret = init_gnutls_session(&session, mc);

654

ret = init_gnutls_session(&session);

716

655

if(ret != 0){

717

656

return -1;

718

657

}

719

658

720

659

if(debug){

721

660

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

722

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

661

PRIu16 "\n", ip, port);

723

662

}

724

663

725

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

737

676

738

677

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

739

678

if(af == AF_INET6){

740

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

741

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

679

to.in6.sin6_family = (sa_family_t)af;

680

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

742

681

} else { /* IPv4 */

743

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

744

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

682

to.in.sin_family = (sa_family_t)af;

683

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

745

684

}

746

685

if(ret < 0 ){

747

686

int e = errno;

756

695

goto mandos_end;

757

696

}

758

697

if(af == AF_INET6){

759

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

760

if(IN6_IS_ADDR_LINKLOCAL

761

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

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*/

762

705

if(if_index == AVAHI_IF_UNSPEC){

763

706

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

764

707

" incomplete without a network interface\n");

766

709

goto mandos_end;

767

710

}

768

711

/* Set the network interface number as scope */

769

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

712

to.in6.sin6_scope_id = (uint32_t)if_index;

770

713

}

771

714

} else {

772

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

715

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

716

-Wconversion and

717

-Wunreachable-code */

773

718

}

774

719

775

720

if(quit_now){

783

728

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

784

729

perror_plus("if_indextoname");

785

730

} else {

786

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

787

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

731

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

732

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

788

733

}

789

734

} else {

790

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

791

ip, (uintmax_t)port);

735

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

736

ip, port);

792

737

}

793

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

794

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

740

const char *pcret;

795

741

if(af == AF_INET6){

796

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

797

sizeof(struct sockaddr_in6),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

742

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

743

sizeof(addrstr));

800

744

} else {

801

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

802

sizeof(struct sockaddr_in),

803

addrstr, sizeof(addrstr), NULL, 0,

804

NI_NUMERICHOST);

745

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

746

sizeof(addrstr));

805

747

}

806

if(ret == EAI_SYSTEM){

807

perror_plus("getnameinfo");

808

} else if(ret != 0) {

809

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

810

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

811

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

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

}

812

754

}

813

755

}

814

756

818

760

}

819

761

820

762

if(af == AF_INET6){

821

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

822

sizeof(struct sockaddr_in6));

763

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

823

764

} else {

824

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

825

sizeof(struct sockaddr_in));

765

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

826

766

}

827

767

if(ret < 0){

828

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

768

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

829

769

int e = errno;

830

770

perror_plus("connect");

831

771

errno = e;

877

817

goto mandos_end;

878

818

}

879

819

880

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

881

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

882

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

883

gnutls_transport_set_ptr(session,

884

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

820

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

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

885

822

886

823

if(quit_now){

887

824

errno = EINTR;

992

929

if(buffer_length > 0){

993

930

ssize_t decrypted_buffer_size;

994

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

995

&decrypted_buffer, mc);

932

&decrypted_buffer);

996

933

if(decrypted_buffer_size >= 0){

997

934

998

935

written = 0;

1046

983

return retval;

1047

984

}

1048

985

1049

__attribute__((nonnull))

1050

986

static void resolve_callback(AvahiSServiceResolver *r,

1051

987

AvahiIfIndex interface,

1052

988

AvahiProtocol proto,

1060

996

AVAHI_GCC_UNUSED AvahiStringList *txt,

1061

997

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

998

flags,

1063

void *mc){

1064

if(r == NULL){

1065

return;

1066

}

999

AVAHI_GCC_UNUSED void* userdata){

1000

assert(r);

1067

1001

1068

1002

/* Called whenever a service has been resolved successfully or

1069

1003

timed out */

1078

1012

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

1079

1013

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

1080

1014

domain,

1081

avahi_strerror(avahi_server_errno

1082

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

1015

avahi_strerror(avahi_server_errno(mc.server)));

1083

1016

break;

1084

1017

1085

1018

case AVAHI_RESOLVER_FOUND:

1091

1024

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

1092

1025

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

1093

1026

}

1094

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

1095

interface,

1096

avahi_proto_to_af(proto),

1097

mc);

1027

int ret = start_mandos_communication(ip, port, interface,

1028

avahi_proto_to_af(proto));

1098

1029

if(ret == 0){

1099

avahi_simple_poll_quit(simple_poll);

1030

avahi_simple_poll_quit(mc.simple_poll);

1100

1031

} else {

1101

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

1102

avahi_proto_to_af(proto),

1103

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

1104

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

1105

" list\n", name);

1106

}

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1107

1034

}

1108

1035

}

1109

1036

}

1119

1046

const char *domain,

1120

1047

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1121

1048

flags,

1122

void *mc){

1123

if(b == NULL){

1124

return;

1125

}

1049

AVAHI_GCC_UNUSED void* userdata){

1050

assert(b);

1126

1051

1127

1052

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

1128

1053

is removed from the LAN */

1136

1061

case AVAHI_BROWSER_FAILURE:

1137

1062

1138

1063

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

1139

avahi_strerror(avahi_server_errno

1140

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

1141

avahi_simple_poll_quit(simple_poll);

1064

avahi_strerror(avahi_server_errno(mc.server)));

1065

avahi_simple_poll_quit(mc.simple_poll);

1142

1066

return;

1143

1067

1144

1068

case AVAHI_BROWSER_NEW:

1147

1071

the callback function is called the Avahi server will free the

1148

1072

resolver for us. */

1149

1073

1150

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

1151

interface, protocol, name, type,

1152

domain, protocol, 0,

1153

resolve_callback, mc) == NULL)

1074

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

1075

name, type, domain, protocol, 0,

1076

resolve_callback, NULL) == NULL)

1154

1077

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

1155

1078

" %s\n", name,

1156

avahi_strerror(avahi_server_errno

1157

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

1079

avahi_strerror(avahi_server_errno(mc.server)));

1158

1080

break;

1159

1081

1160

1082

case AVAHI_BROWSER_REMOVE:

1179

1101

signal_received = sig;

1180

1102

int old_errno = errno;

1181

1103

/* set main loop to exit */

1182

if(simple_poll != NULL){

1183

avahi_simple_poll_quit(simple_poll);

1104

if(mc.simple_poll != NULL){

1105

avahi_simple_poll_quit(mc.simple_poll);

1184

1106

}

1185

1107

errno = old_errno;

1186

1108

}

1187

1109

1188

__attribute__((nonnull, warn_unused_result))

1189

1110

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

1190

1111

int ret;

1191

error_t ret_errno;

1192

1112

1193

1113

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

1194

1114

if(s < 0){

1195

ret_errno = errno;

1196

1115

perror_plus("socket");

1197

errno = ret_errno;

1198

1116

return false;

1199

1117

}

1200

1118

strcpy(ifr->ifr_name, ifname);

1201

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1202

1120

if(ret == -1){

1203

1121

if(debug){

1204

ret_errno = errno;

1205

1122

perror_plus("ioctl SIOCGIFFLAGS");

1206

errno = ret_errno;

1207

1123

}

1208

1124

return false;

1209

1125

}

1210

1126

return true;

1211

1127

}

1212

1128

1213

__attribute__((nonnull, warn_unused_result))

1214

1129

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

1215

1130

1216

1131

/* Reject the loopback device */

1258

1173

* corresponds to an acceptable network device.

1259

1174

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

1260

1175

*/

1261

__attribute__((nonnull, warn_unused_result))

1262

1176

int good_interface(const struct dirent *if_entry){

1263

1177

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

1264

1178

return 0;

1280

1194

}

1281

1195

1282

1196

/*

1283

* This function determines if a network interface is up.

1284

*/

1285

__attribute__((nonnull, warn_unused_result))

1286

bool interface_is_up(const char *interface){

1287

struct ifreq ifr;

1288

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

1289

if(debug){

1290

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

1291

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

1292

}

1293

return false;

1294

}

1295

1296

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

1297

}

1298

1299

/*

1300

* This function determines if a network interface is running

1301

*/

1302

__attribute__((nonnull, warn_unused_result))

1303

bool interface_is_running(const char *interface){

1304

struct ifreq ifr;

1305

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

1306

if(debug){

1307

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

1308

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

1309

}

1310

return false;

1311

}

1312

1313

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

1314

}

1315

1316

__attribute__((nonnull, pure, warn_unused_result))

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

1317

1239

int notdotentries(const struct dirent *direntry){

1318

1240

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

1319

1241

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

1326

1248

}

1327

1249

1328

1250

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

1329

__attribute__((nonnull, warn_unused_result))

1330

1251

int runnable_hook(const struct dirent *direntry){

1331

1252

int ret;

1332

1253

size_t sret;

1340

1261

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

1341

1262

"abcdefghijklmnopqrstuvwxyz"

1342

1263

"0123456789"

1343

"_.-");

1264

"_-");

1344

1265

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

1345

1266

/* Contains non-allowed characters */

1346

1267

if(debug){

1350

1271

return 0;

1351

1272

}

1352

1273

1353

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

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);

1354

1282

if(ret == -1){

1355

1283

if(debug){

1356

1284

perror_plus("Could not stat hook");

1380

1308

return 1;

1381

1309

}

1382

1310

1383

__attribute__((nonnull, warn_unused_result))

1384

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1385

mandos_context *mc){

1311

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1386

1312

int ret;

1387

1313

struct timespec now;

1388

1314

struct timespec waited_time;

1389

1315

intmax_t block_time;

1390

1316

1391

1317

while(true){

1392

if(mc->current_server == NULL){

1393

if(debug){

1318

if(mc.current_server == NULL){

1319

if (debug){

1394

1320

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

1395

1321

" No timeout!\n");

1396

1322

}

1397

1323

ret = avahi_simple_poll_iterate(s, -1);

1398

1324

} else {

1399

if(debug){

1325

if (debug){

1400

1326

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

1401

1327

" it, or wait\n");

1402

1328

}

1409

1335

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

1410

1336

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

1411

1337

waited_time.tv_sec = (now.tv_sec

1412

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

1338

- mc.current_server->last_seen.tv_sec);

1413

1339

waited_time.tv_nsec = (now.tv_nsec

1414

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

1340

- mc.current_server->last_seen.tv_nsec);

1415

1341

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

1416

1342

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

1417

1343

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

1419

1345

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

1420

1346

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

1421

1347

1422

if(debug){

1348

if (debug){

1423

1349

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

1424

1350

block_time);

1425

1351

}

1426

1352

1427

1353

if(block_time <= 0){

1428

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

1429

mc->current_server->port,

1430

mc->current_server->if_index,

1431

mc->current_server->af, mc);

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);

1432

1358

if(ret == 0){

1433

avahi_simple_poll_quit(s);

1359

avahi_simple_poll_quit(mc.simple_poll);

1434

1360

return 0;

1435

1361

}

1436

1362

ret = clock_gettime(CLOCK_MONOTONIC,

1437

&mc->current_server->last_seen);

1363

&mc.current_server->last_seen);

1438

1364

if(ret == -1){

1439

1365

perror_plus("clock_gettime");

1440

1366

return -1;

1441

1367

}

1442

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

1368

mc.current_server = mc.current_server->next;

1443

1369

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

1444

1370

servers, but don't block */

1445

1371

}

1447

1373

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

1448

1374

}

1449

1375

if(ret != 0){

1450

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

1376

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

1451

1377

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

1452

1378

}

1453

1379

}

1454

1380

}

1455

1381

}

1456

1382

1457

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

1458

__attribute__((warn_unused_result))

1459

error_t raise_privileges(void){

1460

error_t old_errno = errno;

1461

error_t ret_errno = 0;

1462

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

1463

ret_errno = errno;

1464

}

1465

errno = old_errno;

1466

return ret_errno;

1467

}

1468

1469

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

1470

__attribute__((warn_unused_result))

1471

error_t raise_privileges_permanently(void){

1472

error_t old_errno = errno;

1473

error_t ret_errno = raise_privileges();

1474

if(ret_errno != 0){

1475

errno = old_errno;

1476

return ret_errno;

1477

}

1478

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

1479

ret_errno = errno;

1480

}

1481

errno = old_errno;

1482

return ret_errno;

1483

}

1484

1485

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

1486

__attribute__((warn_unused_result))

1487

error_t lower_privileges(void){

1488

error_t old_errno = errno;

1489

error_t ret_errno = 0;

1490

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

1491

ret_errno = errno;

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

}

1505

errno = old_errno;

1506

return ret_errno;

1507

}

1508

1509

__attribute__((nonnull))

1510

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

1383

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

1511

1384

const float delay){

1512

struct dirent **direntries = NULL;

1513

if(hookdir_fd == -1){

1514

hookdir_fd = open(hookdir, O_RDONLY);

1515

if(hookdir_fd == -1){

1516

if(errno == ENOENT){

1517

if(debug){

1518

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

1519

" found\n", hookdir);

1520

}

1521

} else {

1522

perror_plus("open");

1523

}

1524

return;

1525

}

1526

}

1527

#ifdef __GLIBC__

1528

#if __GLIBC_PREREQ(2, 15)

1529

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

1530

runnable_hook, alphasort);

1531

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

1532

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

1533

alphasort);

1534

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

1535

#else /* not __GLIBC__ */

1536

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

1537

alphasort);

1538

#endif /* not __GLIBC__ */

1385

struct dirent **direntries;

1386

struct dirent *direntry;

1387

int ret;

1388

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

1389

alphasort);

1539

1390

if(numhooks == -1){

1540

1391

perror_plus("scandir");

1541

return;

1542

}

1543

struct dirent *direntry;

1544

int ret;

1545

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

1546

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

1547

direntry = direntries[i];

1548

if(debug){

1549

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

1550

direntry->d_name);

1551

}

1552

pid_t hook_pid = fork();

1553

if(hook_pid == 0){

1554

/* Child */

1555

/* Raise privileges */

1556

errno = raise_privileges_permanently();

1557

if(errno != 0){

1558

perror_plus("Failed to raise privileges");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Set group */

1562

errno = 0;

1563

ret = setgid(0);

1564

if(ret == -1){

1565

perror_plus("setgid");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Reset supplementary groups */

1569

errno = 0;

1570

ret = setgroups(0, NULL);

1571

if(ret == -1){

1572

perror_plus("setgroups");

1573

_exit(EX_NOPERM);

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

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

1591

if(ret == -1){

1592

perror_plus("setenv");

1593

_exit(EX_OSERR);

1594

}

1595

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

1596

if(ret == -1){

1597

perror_plus("setenv");

1598

_exit(EX_OSERR);

1599

}

1600

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

1601

if(ret == -1){

1602

perror_plus("setenv");

1603

_exit(EX_OSERR);

1604

}

1605

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

1606

if(ret == -1){

1607

perror_plus("setenv");

1608

_exit(EX_OSERR);

1609

}

1610

char *delaystring;

1611

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

1612

if(ret == -1){

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){

1613

1399

perror_plus("asprintf");

1614

_exit(EX_OSERR);

1615

}

1616

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

1617

if(ret == -1){

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

_exit(EX_OSERR);

1416

}

1417

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

1418

if(ret == -1){

1419

perror_plus("setenv");

1420

_exit(EX_OSERR);

1421

}

1422

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

1423

if(ret == -1){

1424

perror_plus("setenv");

1425

_exit(EX_OSERR);

1426

}

1427

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

1428

if(ret == -1){

1429

perror_plus("setenv");

1430

_exit(EX_OSERR);

1431

}

1432

char *delaystring;

1433

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

1434

if(ret == -1){

1435

perror_plus("asprintf");

1436

_exit(EX_OSERR);

1437

}

1438

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

1439

if(ret == -1){

1440

free(delaystring);

1441

perror_plus("setenv");

1442

_exit(EX_OSERR);

1443

}

1618

1444

free(delaystring);

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

free(delaystring);

1623

if(connect_to != NULL){

1624

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

1625

if(ret == -1){

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

}

1630

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

1631

if(hook_fd == -1){

1632

perror_plus("openat");

1633

_exit(EXIT_FAILURE);

1634

}

1635

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

1636

perror_plus("close");

1637

_exit(EXIT_FAILURE);

1638

}

1639

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

1640

environ) == -1){

1641

perror_plus("fexecve");

1642

_exit(EXIT_FAILURE);

1643

}

1644

} else {

1645

int status;

1646

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

1647

perror_plus("waitpid");

1648

continue;

1649

}

1650

if(WIFEXITED(status)){

1651

if(WEXITSTATUS(status) != 0){

1652

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

1653

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

1654

WEXITSTATUS(status));

1655

continue;

1656

}

1657

} else if(WIFSIGNALED(status)){

1658

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

1659

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

1660

WTERMSIG(status));

1661

continue;

1662

} else {

1663

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

1664

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

1665

continue;

1666

}

1667

}

1668

if(debug){

1669

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

1670

direntry->d_name);

1671

}

1672

}

1673

free(direntries);

1674

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

1675

perror_plus("close");

1676

} else {

1677

hookdir_fd = -1;

1678

}

1679

close(devnull);

1680

}

1681

1682

__attribute__((nonnull, warn_unused_result))

1683

error_t bring_up_interface(const char *const interface,

1684

const float delay){

1685

error_t old_errno = errno;

1686

int ret;

1687

struct ifreq network;

1688

unsigned int if_index = if_nametoindex(interface);

1689

if(if_index == 0){

1690

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

1691

errno = old_errno;

1692

return ENXIO;

1693

}

1694

1695

if(quit_now){

1696

errno = old_errno;

1697

return EINTR;

1698

}

1699

1700

if(not interface_is_up(interface)){

1701

error_t ret_errno = 0, ioctl_errno = 0;

1702

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

1703

ret_errno = errno;

1704

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

1705

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

1706

errno = old_errno;

1707

return ret_errno;

1708

}

1709

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

1710

1711

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

1712

if(sd == -1){

1713

ret_errno = errno;

1714

perror_plus("socket");

1715

errno = old_errno;

1716

return ret_errno;

1717

}

1718

1719

if(quit_now){

1720

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

1721

if(ret == -1){

1722

perror_plus("close");

1723

}

1724

errno = old_errno;

1725

return EINTR;

1726

}

1727

1728

if(debug){

1729

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

1730

interface);

1731

}

1732

1733

/* Raise privileges */

1734

ret_errno = raise_privileges();

1735

if(ret_errno != 0){

1736

errno = ret_errno;

1737

perror_plus("Failed to raise privileges");

1738

}

1739

1740

#ifdef __linux__

1741

int ret_linux;

1742

bool restore_loglevel = false;

1743

if(ret_errno == 0){

1744

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1745

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

1746

ret_linux = klogctl(8, NULL, 5);

1747

if(ret_linux == -1){

1748

perror_plus("klogctl");

1749

} else {

1750

restore_loglevel = true;

1751

}

1752

}

1753

#endif /* __linux__ */

1754

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

1755

ioctl_errno = errno;

1756

#ifdef __linux__

1757

if(restore_loglevel){

1758

ret_linux = klogctl(7, NULL, 0);

1759

if(ret_linux == -1){

1760

perror_plus("klogctl");

1761

}

1762

}

1763

#endif /* __linux__ */

1764

1765

/* If raise_privileges() succeeded above */

1766

if(ret_errno == 0){

1767

/* Lower privileges */

1768

ret_errno = lower_privileges();

1769

if(ret_errno != 0){

1770

errno = ret_errno;

1771

perror_plus("Failed to lower privileges");

1772

}

1773

}

1774

1775

/* Close the socket */

1776

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

1777

if(ret == -1){

1778

perror_plus("close");

1779

}

1780

1781

if(ret_setflags == -1){

1782

errno = ioctl_errno;

1783

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1784

errno = old_errno;

1785

return ioctl_errno;

1786

}

1787

} else if(debug){

1788

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

1789

interface);

1790

}

1791

1792

/* Sleep checking until interface is running.

1793

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

1794

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

1795

if(interface_is_running(interface)){

1796

break;

1797

}

1798

struct timespec sleeptime = { .tv_nsec = 250000000 };

1799

ret = nanosleep(&sleeptime, NULL);

1800

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

1801

perror_plus("nanosleep");

1802

}

1803

}

1804

1805

errno = old_errno;

1806

return 0;

1807

}

1808

1809

__attribute__((nonnull, warn_unused_result))

1810

error_t take_down_interface(const char *const interface){

1811

error_t old_errno = errno;

1812

struct ifreq network;

1813

unsigned int if_index = if_nametoindex(interface);

1814

if(if_index == 0){

1815

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

1816

errno = old_errno;

1817

return ENXIO;

1818

}

1819

if(interface_is_up(interface)){

1820

error_t ret_errno = 0, ioctl_errno = 0;

1821

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

1822

ret_errno = errno;

1823

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

1824

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

1825

errno = old_errno;

1826

return ret_errno;

1827

}

1828

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

1829

1830

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

1831

if(sd == -1){

1832

ret_errno = errno;

1833

perror_plus("socket");

1834

errno = old_errno;

1835

return ret_errno;

1836

}

1837

1838

if(debug){

1839

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

1840

interface);

1841

}

1842

1843

/* Raise privileges */

1844

ret_errno = raise_privileges();

1845

if(ret_errno != 0){

1846

errno = ret_errno;

1847

perror_plus("Failed to raise privileges");

1848

}

1849

1850

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

1851

ioctl_errno = errno;

1852

1853

/* If raise_privileges() succeeded above */

1854

if(ret_errno == 0){

1855

/* Lower privileges */

1856

ret_errno = lower_privileges();

1857

if(ret_errno != 0){

1858

errno = ret_errno;

1859

perror_plus("Failed to lower privileges");

1860

}

1861

}

1862

1863

/* Close the socket */

1864

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

1865

if(ret == -1){

1866

perror_plus("close");

1867

}

1868

1869

if(ret_setflags == -1){

1870

errno = ioctl_errno;

1871

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1872

errno = old_errno;

1873

return ioctl_errno;

1874

}

1875

} else if(debug){

1876

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

1877

interface);

1878

}

1879

1880

errno = old_errno;

1881

return 0;

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;

1882

1484

}

1883

1485

1884

1486

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

1885

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

1886

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

1887

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

1888

.interfaces = NULL, .interfaces_size = 0 };

1889

1487

AvahiSServiceBrowser *sb = NULL;

1890

error_t ret_errno;

1488

int error;

1891

1489

int ret;

1892

1490

intmax_t tmpmax;

1893

1491

char *tmp;

1894

1492

int exitcode = EXIT_SUCCESS;

1895

char *interfaces_to_take_down = NULL;

1896

size_t interfaces_to_take_down_size = 0;

1897

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

1898

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

1899

char *tempdir = NULL;

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;

1900

1501

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1901

1502

const char *seckey = PATHDIR "/" SECKEY;

1902

1503

const char *pubkey = PATHDIR "/" PUBKEY;

1903

char *interfaces_hooks = NULL;

1904

1504

1905

1505

bool gnutls_initialized = false;

1906

1506

bool gpgme_initialized = false;

1968

1568

.group = 2 },

1969

1569

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

1970

1570

.arg = "SECONDS",

1971

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

1571

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

1972

1572

.group = 2 },

1973

1573

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

1974

1574

.arg = "DIR",

1997

1597

connect_to = arg;

1998

1598

break;

1999

1599

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

2000

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

2001

arg, (int)',');

2002

if(ret_errno != 0){

2003

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

2004

}

1600

interface = arg;

2005

1601

break;

2006

1602

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

2007

1603

seckey = arg;

2050

1646

argp_state_help(state, state->out_stream,

2051

1647

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2052

1648

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

1649

fprintf_plus(state->out_stream,

1650

"Mandos plugin mandos-client: ");

2053

1651

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

2054

1652

exit(argp_err_exit_status);

2055

1653

break;

2080

1678

}

2081

1679

}

2082

1680

2083

{

1681

if(getuid() == 0){

2084

1682

/* Work around Debian bug #633582:

2085

1683

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

2086

2087

/* Re-raise privileges */

2088

ret_errno = raise_privileges();

2089

if(ret_errno != 0){

2090

errno = ret_errno;

2091

perror_plus("Failed to raise privileges");

2092

} else {

2093

struct stat st;

2094

2095

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

2096

int seckey_fd = open(seckey, O_RDONLY);

2097

if(seckey_fd == -1){

2098

perror_plus("open");

2099

} else {

2100

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

2101

if(ret == -1){

2102

perror_plus("fstat");

2103

} else {

2104

if(S_ISREG(st.st_mode)

2105

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

2106

ret = fchown(seckey_fd, uid, gid);

2107

if(ret == -1){

2108

perror_plus("fchown");

2109

}

2110

}

2111

}

2112

TEMP_FAILURE_RETRY(close(seckey_fd));

2113

}

2114

}

2115

2116

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

2117

int pubkey_fd = open(pubkey, O_RDONLY);

2118

if(pubkey_fd == -1){

2119

perror_plus("open");

2120

} else {

2121

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

2122

if(ret == -1){

2123

perror_plus("fstat");

2124

} else {

2125

if(S_ISREG(st.st_mode)

2126

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

2127

ret = fchown(pubkey_fd, uid, gid);

2128

if(ret == -1){

2129

perror_plus("fchown");

2130

}

2131

}

2132

}

2133

TEMP_FAILURE_RETRY(close(pubkey_fd));

2134

}

2135

}

2136

2137

/* Lower privileges */

2138

ret_errno = lower_privileges();

2139

if(ret_errno != 0){

2140

errno = ret_errno;

2141

perror_plus("Failed to lower privileges");

2142

}

2143

}

2144

}

2145

2146

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

2147

{

2148

char *interface = NULL;

2149

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

2150

interface))){

2151

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

2152

and if_nametoindex(interface) == 0){

2153

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

2154

fprintf_plus(stderr, "Not using nonexisting interface"

2155

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

2156

}

2157

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

2158

interface = NULL;

2159

}

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");

2160

1740

}

2161

1741

}

2162

1742

2163

1743

/* Run network hooks */

2164

1744

{

2165

if(mc.interfaces != NULL){

2166

interfaces_hooks = malloc(mc.interfaces_size);

2167

if(interfaces_hooks == NULL){

2168

perror_plus("malloc");

2169

goto end;

2170

}

2171

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

2172

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

2173

}

2174

run_network_hooks("start", interfaces_hooks != NULL ?

2175

interfaces_hooks : "", delay);

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

}

2176

1764

}

2177

1765

2178

1766

if(not debug){

2179

1767

avahi_set_log_function(empty_log);

2180

1768

}

2181

1769

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

2182

1802

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

2183

1803

from the signal handler */

2184

1804

/* Initialize the pseudo-RNG for Avahi */

2185

1805

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

2186

simple_poll = avahi_simple_poll_new();

2187

if(simple_poll == NULL){

1806

mc.simple_poll = avahi_simple_poll_new();

1807

if(mc.simple_poll == NULL){

2188

1808

fprintf_plus(stderr,

2189

1809

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

2190

1810

exitcode = EX_UNAVAILABLE;

2254

1874

}

2255

1875

}

2256

1876

2257

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

2258

if(mc.interfaces == NULL){

2259

struct dirent **direntries = NULL;

2260

/* Look for any good interfaces */

2261

ret = scandir(sys_class_net, &direntries, good_interface,

2262

alphasort);

2263

if(ret >= 1){

2264

/* Add all found interfaces to interfaces list */

2265

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

2266

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

2267

direntries[i]->d_name);

2268

if(ret_errno != 0){

2269

errno = ret_errno;

2270

perror_plus("argz_add");

2271

continue;

2272

}

2273

if(debug){

2274

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

2275

direntries[i]->d_name);

2276

}

2277

}

2278

free(direntries);

2279

} else {

2280

if(ret == 0){

2281

free(direntries);

2282

}

2283

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

2284

exitcode = EXIT_FAILURE;

2285

goto end;

2286

}

2287

}

2288

2289

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

2290

{

2291

char *interface = NULL;

2292

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

2293

interface))){

2294

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

2295

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

2296

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

2297

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

2298

interface);

2299

interface = NULL;

2300

while((interface = argz_next(mc.interfaces,

2301

mc.interfaces_size, interface))){

2302

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

2303

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

2304

interface);

2305

interface = NULL;

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");

2306

1962

}

2307

1963

}

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){

2308

1981

break;

2309

1982

}

2310

bool interface_was_up = interface_is_up(interface);

2311

errno = bring_up_interface(interface, delay);

2312

if(not interface_was_up){

2313

if(errno != 0){

2314

perror_plus("Failed to bring up interface");

2315

} else {

2316

errno = argz_add(&interfaces_to_take_down,

2317

&interfaces_to_take_down_size,

2318

interface);

2319

if(errno != 0){

2320

perror_plus("argz_add");

2321

}

2322

}

2323

}

2324

}

2325

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

2326

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

2327

}

2328

}

2329

2330

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

2331

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

2332

if(debug){

2333

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

2334

mc.interfaces);

2335

}

2336

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

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

}

2337

2012

}

2338

2013

2339

2014

if(quit_now){

2340

2015

goto end;

2341

2016

}

2342

2017

2343

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

2018

ret = init_gnutls_global(pubkey, seckey);

2344

2019

if(ret == -1){

2345

2020

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

2346

2021

exitcode = EX_UNAVAILABLE;

2353

2028

goto end;

2354

2029

}

2355

2030

2356

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

2357

tempdir = mkdtemp(run_tempdir);

2358

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

2359

if(debug){

2360

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

2361

run_tempdir, old_tempdir);

2362

}

2363

tempdir = mkdtemp(old_tempdir);

2364

}

2365

if(tempdir == NULL){

2031

if(mkdtemp(tempdir) == NULL){

2366

2032

perror_plus("mkdtemp");

2367

2033

goto end;

2368

2034

}

2035

tempdir_created = true;

2369

2036

2370

2037

if(quit_now){

2371

2038

goto end;

2372

2039

}

2373

2040

2374

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

2041

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

2375

2042

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

2376

2043

exitcode = EX_UNAVAILABLE;

2377

2044

goto end;

2387

2054

/* Connect directly, do not use Zeroconf */

2388

2055

/* (Mainly meant for debugging) */

2389

2056

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

2390

2391

2057

if(address == NULL){

2392

2058

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

2393

2059

exitcode = EX_USAGE;

2398

2064

goto end;

2399

2065

}

2400

2066

2401

in_port_t port;

2067

uint16_t port;

2402

2068

errno = 0;

2403

2069

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

2404

2070

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

2405

or tmpmax != (in_port_t)tmpmax){

2071

or tmpmax != (uint16_t)tmpmax){

2406

2072

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

2407

2073

exitcode = EX_USAGE;

2408

2074

goto end;

2409

2075

}

2410

2076

2411

2077

if(quit_now){

2412

2078

goto end;

2413

2079

}

2414

2080

2415

port = (in_port_t)tmpmax;

2081

port = (uint16_t)tmpmax;

2416

2082

*address = '\0';

2417

2083

/* Colon in address indicates IPv6 */

2418

2084

int af;

2434

2100

}

2435

2101

2436

2102

while(not quit_now){

2437

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

2438

&mc);

2103

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

2439

2104

if(quit_now or ret == 0){

2440

2105

break;

2441

2106

}

2443

2108

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

2444

2109

(int)retry_interval);

2445

2110

}

2446

sleep((unsigned int)retry_interval);

2111

sleep((int)retry_interval);

2447

2112

}

2448

2113

2449

if(not quit_now){

2114

if (not quit_now){

2450

2115

exitcode = EXIT_SUCCESS;

2451

2116

}

2452

2117

2467

2132

config.publish_domain = 0;

2468

2133

2469

2134

/* Allocate a new server */

2470

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2471

&config, NULL, NULL, &ret_errno);

2135

mc.server = avahi_server_new(avahi_simple_poll_get

2136

(mc.simple_poll), &config, NULL,

2137

NULL, &error);

2472

2138

2473

2139

/* Free the Avahi configuration data */

2474

2140

avahi_server_config_free(&config);

2477

2143

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

2478

2144

if(mc.server == NULL){

2479

2145

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

2480

avahi_strerror(ret_errno));

2146

avahi_strerror(error));

2481

2147

exitcode = EX_UNAVAILABLE;

2482

2148

goto end;

2483

2149

}

2489

2155

/* Create the Avahi service browser */

2490

2156

sb = avahi_s_service_browser_new(mc.server, if_index,

2491

2157

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2492

NULL, 0, browse_callback,

2493

(void *)&mc);

2158

NULL, 0, browse_callback, NULL);

2494

2159

if(sb == NULL){

2495

2160

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

2496

2161

avahi_strerror(avahi_server_errno(mc.server)));

2507

2172

if(debug){

2508

2173

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

2509

2174

}

2510

2511

ret = avahi_loop_with_timeout(simple_poll,

2512

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

2175

2176

ret = avahi_loop_with_timeout(mc.simple_poll,

2177

(int)(retry_interval * 1000));

2513

2178

if(debug){

2514

2179

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

2515

2180

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

2522

2187

}

2523

2188

2524

2189

/* Cleanup things */

2525

free(mc.interfaces);

2526

2527

2190

if(sb != NULL)

2528

2191

avahi_s_service_browser_free(sb);

2529

2192

2530

2193

if(mc.server != NULL)

2531

2194

avahi_server_free(mc.server);

2532

2195

2533

if(simple_poll != NULL)

2534

avahi_simple_poll_free(simple_poll);

2196

if(mc.simple_poll != NULL)

2197

avahi_simple_poll_free(mc.simple_poll);

2535

2198

2536

2199

if(gnutls_initialized){

2537

2200

gnutls_certificate_free_credentials(mc.cred);

2554

2217

}

2555

2218

}

2556

2219

2557

/* Re-raise privileges */

2220

/* Re-raise priviliges */

2558

2221

{

2559

ret_errno = raise_privileges();

2560

if(ret_errno != 0){

2561

errno = ret_errno;

2562

perror_plus("Failed to raise privileges");

2563

} else {

2564

2565

/* Run network hooks */

2566

run_network_hooks("stop", interfaces_hooks != NULL ?

2567

interfaces_hooks : "", delay);

2568

2569

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

2570

{

2571

char *interface = NULL;

2572

while((interface=argz_next(interfaces_to_take_down,

2573

interfaces_to_take_down_size,

2574

interface))){

2575

ret_errno = take_down_interface(interface);

2576

if(ret_errno != 0){

2577

errno = ret_errno;

2578

perror_plus("Failed to take down interface");

2579

}

2580

}

2581

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

2582

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

2583

" down\n");

2584

}

2585

}

2586

}

2587

2588

ret_errno = lower_privileges_permanently();

2589

if(ret_errno != 0){

2590

errno = ret_errno;

2591

perror_plus("Failed to lower privileges permanently");

2592

}

2593

}

2594

2595

free(interfaces_to_take_down);

2596

free(interfaces_hooks);

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

}

2597

2259

2598

2260

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

2599

if(tempdir != NULL){

2261

if(tempdir_created){

2600

2262

struct dirent **direntries = NULL;

2601

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

2602

O_NOFOLLOW));

2603

if(tempdir_fd == -1){

2604

perror_plus("open");

2605

} else {

2606

#ifdef __GLIBC__

2607

#if __GLIBC_PREREQ(2, 15)

2608

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

2609

notdotentries, alphasort);

2610

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

2611

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

2612

alphasort);

2613

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

2614

#else /* not __GLIBC__ */

2615

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

2616

alphasort);

2617

#endif /* not __GLIBC__ */

2618

if(numentries >= 0){

2619

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

2620

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

2621

if(ret == -1){

2622

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

2623

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

2624

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

2625

}

2626

}

2627

2628

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

2629

free(direntries);

2630

if(numentries == -1){

2631

perror_plus("scandir");

2632

}

2633

ret = rmdir(tempdir);

2634

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

2635

perror_plus("rmdir");

2636

}

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);

2637

2282

}

2638

TEMP_FAILURE_RETRY(close(tempdir_fd));

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");

2639

2293

}

2640

2294

}

2641

2295