/mandos/trunk : revision 738.1.2

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

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

41

42

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

43

stdout, ferror(), remove() */

44

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

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,

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inet_pton(), connect() */

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#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,

63

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(), _exit() */

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,

88

89

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

89

90

WEXITSTATUS(), WTERMSIG() */

90

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() */

91

98

92

99

#ifdef __linux__

93

100

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

135

142

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

136

143

char *connect_to = NULL;

137

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

138

148

139

149

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

140

150

typedef struct server{

141

151

const char *ip;

142

uint16_t port;

152

in_port_t port;

143

153

AvahiIfIndex if_index;

144

154

int af;

145

155

struct timespec last_seen;

149

159

150

160

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

151

161

typedef struct {

152

AvahiSimplePoll *simple_poll;

153

162

AvahiServer *server;

154

163

gnutls_certificate_credentials_t cred;

155

164

unsigned int dh_bits;

157

166

const char *priority;

158

167

gpgme_ctx_t ctx;

159

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

160

171

} mandos_context;

161

172

162

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

163

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

164

.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

167

175

168

176

sig_atomic_t quit_now = 0;

169

177

int signal_received = 0;

170

178

171

179

/* Function to use when printing errors */

172

180

void perror_plus(const char *print_text){

181

int e = errno;

173

182

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

174

183

program_invocation_short_name);

184

errno = e;

175

185

perror(print_text);

176

186

}

177

187

178

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

188

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

179

189

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

180

190

va_list ap;

181

191

va_start (ap, format);

182

192

183

193

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

184

194

program_invocation_short_name));

185

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

195

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

186

196

}

187

197

188

198

/*

190

200

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

191

201

* "buffer_length" is how much is already used.

192

202

*/

203

__attribute__((nonnull, warn_unused_result))

193

204

size_t incbuffer(char **buffer, size_t buffer_length,

194

205

size_t buffer_capacity){

195

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

196

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

197

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;

198

213

return 0;

199

214

}

215

*buffer = new_buf;

200

216

buffer_capacity += BUFFER_SIZE;

201

217

}

202

218

return buffer_capacity;

203

219

}

204

220

205

221

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

206

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

207

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){

208

225

int ret;

209

226

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

210

227

if(new_server == NULL){

217

234

.af = af };

218

235

if(new_server->ip == NULL){

219

236

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

#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);

220

252

return false;

221

253

}

222

254

/* Special case of first server */

223

if (mc.current_server == NULL){

255

if(*current_server == NULL){

224

256

new_server->next = new_server;

225

257

new_server->prev = new_server;

226

mc.current_server = new_server;

227

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

258

*current_server = new_server;

228

259

} else {

229

new_server->next = mc.current_server;

230

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;

231

263

new_server->prev->next = new_server;

232

mc.current_server->prev = new_server;

233

}

234

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

235

if(ret == -1){

236

perror_plus("clock_gettime");

237

return false;

264

(*current_server)->prev = new_server;

238

265

}

239

266

return true;

240

267

}

242

269

/*

243

270

* Initialize GPGME.

244

271

*/

245

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

246

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){

247

277

gpgme_error_t rc;

248

278

gpgme_engine_info_t engine_info;

249

279

250

251

280

/*

252

281

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

253

282

*/

254

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

255

284

int ret;

256

285

int fd;

257

286

gpgme_data_t pgp_data;

269

298

return false;

270

299

}

271

300

272

rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

273

302

if(rc != GPG_ERR_NO_ERROR){

274

303

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

275

304

gpgme_strsource(rc), gpgme_strerror(rc));

319

348

}

320

349

321

350

/* Create new GPGME "context" */

322

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

351

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

323

352

if(rc != GPG_ERR_NO_ERROR){

324

353

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

325

354

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

338

367

* Decrypt OpenPGP data.

339

368

* Returns -1 on error

340

369

*/

370

__attribute__((nonnull, warn_unused_result))

341

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

342

372

size_t crypto_size,

343

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

344

375

gpgme_data_t dh_crypto, dh_plain;

345

376

gpgme_error_t rc;

346

377

ssize_t ret;

372

403

373

404

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

374

405

data buffer */

375

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

406

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

376

407

if(rc != GPG_ERR_NO_ERROR){

377

408

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

378

409

gpgme_strsource(rc), gpgme_strerror(rc));

379

410

plaintext_length = -1;

380

411

if(debug){

381

412

gpgme_decrypt_result_t result;

382

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

383

414

if(result == NULL){

384

415

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

385

416

} else {

462

493

return plaintext_length;

463

494

}

464

495

465

static const char * safer_gnutls_strerror(int value){

466

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

467

-Wunreachable-code */

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

468

499

if(ret == NULL)

469

500

ret = "(unknown)";

470

501

return ret;

471

502

}

472

503

473

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

474

506

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

475

507

const char* string){

476

508

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

477

509

}

478

510

511

__attribute__((nonnull, warn_unused_result))

479

512

static int init_gnutls_global(const char *pubkeyfilename,

480

const char *seckeyfilename){

513

const char *seckeyfilename,

514

mandos_context *mc){

481

515

int ret;

482

516

483

517

if(debug){

500

534

}

501

535

502

536

/* OpenPGP credentials */

503

ret = gnutls_certificate_allocate_credentials(&mc.cred);

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

504

538

if(ret != GNUTLS_E_SUCCESS){

505

539

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

506

540

safer_gnutls_strerror(ret));

516

550

}

517

551

518

552

ret = gnutls_certificate_set_openpgp_key_file

519

(mc.cred, pubkeyfilename, seckeyfilename,

553

(mc->cred, pubkeyfilename, seckeyfilename,

520

554

GNUTLS_OPENPGP_FMT_BASE64);

521

555

if(ret != GNUTLS_E_SUCCESS){

522

556

fprintf_plus(stderr,

528

562

}

529

563

530

564

/* GnuTLS server initialization */

531

ret = gnutls_dh_params_init(&mc.dh_params);

565

ret = gnutls_dh_params_init(&mc->dh_params);

532

566

if(ret != GNUTLS_E_SUCCESS){

533

567

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

534

568

" initialization: %s\n",

535

569

safer_gnutls_strerror(ret));

536

570

goto globalfail;

537

571

}

538

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

572

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

539

573

if(ret != GNUTLS_E_SUCCESS){

540

574

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

541

575

safer_gnutls_strerror(ret));

542

576

goto globalfail;

543

577

}

544

578

545

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

579

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

546

580

547

581

return 0;

548

582

549

583

globalfail:

550

584

551

gnutls_certificate_free_credentials(mc.cred);

585

gnutls_certificate_free_credentials(mc->cred);

552

586

gnutls_global_deinit();

553

gnutls_dh_params_deinit(mc.dh_params);

587

gnutls_dh_params_deinit(mc->dh_params);

554

588

return -1;

555

589

}

556

590

557

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){

558

594

int ret;

559

595

/* GnuTLS session creation */

560

596

do {

572

608

{

573

609

const char *err;

574

610

do {

575

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

611

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

576

612

if(quit_now){

577

613

gnutls_deinit(*session);

578

614

return -1;

589

625

590

626

do {

591

627

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

592

mc.cred);

628

mc->cred);

593

629

if(quit_now){

594

630

gnutls_deinit(*session);

595

631

return -1;

605

641

/* ignore client certificate if any. */

606

642

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

607

643

608

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

609

645

610

646

return 0;

611

647

}

614

650

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

615

651

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

616

652

653

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

654

__attribute__((warn_unused_result))

655

error_t raise_privileges(void){

656

error_t old_errno = errno;

657

error_t ret_errno = 0;

658

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

659

ret_errno = errno;

660

}

661

errno = old_errno;

662

return ret_errno;

663

}

664

665

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

666

__attribute__((warn_unused_result))

667

error_t raise_privileges_permanently(void){

668

error_t old_errno = errno;

669

error_t ret_errno = raise_privileges();

670

if(ret_errno != 0){

671

errno = old_errno;

672

return ret_errno;

673

}

674

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

675

ret_errno = errno;

676

}

677

errno = old_errno;

678

return ret_errno;

679

}

680

681

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

682

__attribute__((warn_unused_result))

683

error_t lower_privileges(void){

684

error_t old_errno = errno;

685

error_t ret_errno = 0;

686

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

687

ret_errno = errno;

688

}

689

errno = old_errno;

690

return ret_errno;

691

}

692

693

/* Lower privileges permanently */

694

__attribute__((warn_unused_result))

695

error_t lower_privileges_permanently(void){

696

error_t old_errno = errno;

697

error_t ret_errno = 0;

698

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

699

ret_errno = errno;

700

}

701

errno = old_errno;

702

return ret_errno;

703

}

704

705

/* Helper function to add_local_route() and remove_local_route() */

706

__attribute__((nonnull, warn_unused_result))

707

static bool add_remove_local_route(const bool add,

708

const char *address,

709

AvahiIfIndex if_index){

710

int ret;

711

char helper[] = "mandos-client-iprouteadddel";

712

char add_arg[] = "add";

713

char remove_arg[] = "remove";

714

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

715

if(pluginhelperdir == NULL){

716

if(debug){

717

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

718

" variable not set; cannot run helper\n");

719

}

720

return false;

721

}

722

723

char interface[IF_NAMESIZE];

724

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

725

perror_plus("if_indextoname");

726

return false;

727

}

728

729

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

730

if(devnull == -1){

731

perror_plus("open(\"/dev/null\", O_RDONLY)");

732

return false;

733

}

734

pid_t pid = fork();

735

if(pid == 0){

736

/* Child */

737

/* Raise privileges */

738

errno = raise_privileges_permanently();

739

if(errno != 0){

740

perror_plus("Failed to raise privileges");

741

/* _exit(EX_NOPERM); */

742

} else {

743

/* Set group */

744

errno = 0;

745

ret = setgid(0);

746

if(ret == -1){

747

perror_plus("setgid");

748

_exit(EX_NOPERM);

749

}

750

/* Reset supplementary groups */

751

errno = 0;

752

ret = setgroups(0, NULL);

753

if(ret == -1){

754

perror_plus("setgroups");

755

_exit(EX_NOPERM);

756

}

757

}

758

ret = dup2(devnull, STDIN_FILENO);

759

if(ret == -1){

760

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

761

_exit(EX_OSERR);

762

}

763

ret = close(devnull);

764

if(ret == -1){

765

perror_plus("close");

766

_exit(EX_OSERR);

767

}

768

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

769

if(ret == -1){

770

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

771

_exit(EX_OSERR);

772

}

773

int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,

774

O_RDONLY

775

| O_DIRECTORY

776

| O_PATH

777

| O_CLOEXEC));

778

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

779

helper, O_RDONLY));

780

TEMP_FAILURE_RETRY(close(helperdir_fd));

781

#ifdef __GNUC__

782

#pragma GCC diagnostic push

783

#pragma GCC diagnostic ignored "-Wcast-qual"

784

#endif

785

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

786

{ helper, add ? add_arg : remove_arg, (char *)address,

787

interface, NULL }, environ) == -1){

788

#ifdef __GNUC__

789

#pragma GCC diagnostic pop

790

#endif

791

perror_plus("fexecve");

792

_exit(EXIT_FAILURE);

793

}

794

}

795

if(pid == -1){

796

perror_plus("fork");

797

return false;

798

}

799

int status;

800

pid_t pret = -1;

801

errno = 0;

802

do {

803

pret = waitpid(pid, &status, 0);

804

if(pret == -1 and errno == EINTR and quit_now){

805

int errno_raising = 0;

806

if((errno = raise_privileges()) != 0){

807

errno_raising = errno;

808

perror_plus("Failed to raise privileges in order to"

809

" kill helper program");

810

}

811

if(kill(pid, SIGTERM) == -1){

812

perror_plus("kill");

813

}

814

if((errno_raising == 0) and (errno = lower_privileges()) != 0){

815

perror_plus("Failed to lower privileges after killing"

816

" helper program");

817

}

818

return false;

819

}

820

} while(pret == -1 and errno == EINTR);

821

if(pret == -1){

822

perror_plus("waitpid");

823

return false;

824

}

825

if(WIFEXITED(status)){

826

if(WEXITSTATUS(status) != 0){

827

fprintf_plus(stderr, "Error: iprouteadddel exited"

828

" with status %d\n", WEXITSTATUS(status));

829

return false;

830

}

831

return true;

832

}

833

if(WIFSIGNALED(status)){

834

fprintf_plus(stderr, "Error: iprouteadddel died by"

835

" signal %d\n", WTERMSIG(status));

836

return false;

837

}

838

fprintf_plus(stderr, "Error: iprouteadddel crashed\n");

839

return false;

840

}

841

842

__attribute__((nonnull, warn_unused_result))

843

static bool add_local_route(const char *address,

844

AvahiIfIndex if_index){

845

return add_remove_local_route(true, address, if_index);

846

}

847

848

__attribute__((nonnull, warn_unused_result))

849

static bool remove_local_route(const char *address,

850

AvahiIfIndex if_index){

851

return add_remove_local_route(false, address, if_index);

852

}

853

617

854

/* Called when a Mandos server is found */

618

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

855

__attribute__((nonnull, warn_unused_result))

856

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

619

857

AvahiIfIndex if_index,

620

int af){

858

int af, mandos_context *mc){

621

859

int ret, tcp_sd = -1;

622

860

ssize_t sret;

623

union {

624

struct sockaddr_in in;

625

struct sockaddr_in6 in6;

626

} to;

861

struct sockaddr_storage to;

627

862

char *buffer = NULL;

628

863

char *decrypted_buffer = NULL;

629

864

size_t buffer_length = 0;

632

867

int retval = -1;

633

868

gnutls_session_t session;

634

869

int pf; /* Protocol family */

870

bool route_added = false;

635

871

636

872

errno = 0;

637

873

653

889

return -1;

654

890

}

655

891

656

ret = init_gnutls_session(&session);

892

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

893

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

894

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

895

bool match = false;

896

{

897

char *interface = NULL;

898

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

899

interface))){

900

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

901

match = true;

902

break;

903

}

904

}

905

}

906

if(not match){

907

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

908

connect to the server */

909

if(debug){

910

char interface[IF_NAMESIZE];

911

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

912

perror_plus("if_indextoname");

913

} else {

914

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

915

" \"%s\"\n",

916

if_indextoname((unsigned int)if_index,

917

interface));

918

}

919

}

920

return -1;

921

}

922

}

923

924

ret = init_gnutls_session(&session, mc);

657

925

if(ret != 0){

658

926

return -1;

659

927

}

660

928

661

929

if(debug){

662

930

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

663

PRIu16 "\n", ip, port);

931

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

664

932

}

665

933

666

tcp_sd = socket(pf, SOCK_STREAM, 0);

934

tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);

667

935

if(tcp_sd < 0){

668

936

int e = errno;

669

937

perror_plus("socket");

678

946

679

947

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

680

948

if(af == AF_INET6){

681

to.in6.sin6_family = (sa_family_t)af;

682

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

949

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

950

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

683

951

} else { /* IPv4 */

684

to.in.sin_family = (sa_family_t)af;

685

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

952

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

953

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

686

954

}

687

955

if(ret < 0 ){

688

956

int e = errno;

697

965

goto mandos_end;

698

966

}

699

967

if(af == AF_INET6){

700

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

701

-Wconversion and

702

-Wunreachable-code */

703

704

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

705

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

706

-Wunreachable-code*/

968

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

969

if(IN6_IS_ADDR_LINKLOCAL

970

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

707

971

if(if_index == AVAHI_IF_UNSPEC){

708

972

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

709

973

" incomplete without a network interface\n");

711

975

goto mandos_end;

712

976

}

713

977

/* Set the network interface number as scope */

714

to.in6.sin6_scope_id = (uint32_t)if_index;

978

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

715

979

}

716

980

} else {

717

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

718

-Wconversion and

719

-Wunreachable-code */

981

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

720

982

}

721

983

722

984

if(quit_now){

730

992

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

731

993

perror_plus("if_indextoname");

732

994

} else {

733

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

734

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

995

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

996

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

735

997

}

736

998

} else {

737

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

738

ip, port);

999

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

1000

ip, (uintmax_t)port);

739

1001

}

740

1002

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

741

1003

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

742

const char *pcret;

743

if(af == AF_INET6){

744

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

745

sizeof(addrstr));

746

} else {

747

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

748

sizeof(addrstr));

749

}

750

if(pcret == NULL){

751

perror_plus("inet_ntop");

752

} else {

753

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

754

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

755

}

756

}

757

}

758

759

if(quit_now){

760

errno = EINTR;

761

goto mandos_end;

762

}

763

764

if(af == AF_INET6){

765

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

766

} else {

767

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

768

}

769

if(ret < 0){

770

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

771

int e = errno;

772

perror_plus("connect");

773

errno = e;

774

}

775

goto mandos_end;

776

}

777

778

if(quit_now){

779

errno = EINTR;

780

goto mandos_end;

1004

if(af == AF_INET6){

1005

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

1006

sizeof(struct sockaddr_in6),

1007

addrstr, sizeof(addrstr), NULL, 0,

1008

NI_NUMERICHOST);

1009

} else {

1010

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

1011

sizeof(struct sockaddr_in),

1012

addrstr, sizeof(addrstr), NULL, 0,

1013

NI_NUMERICHOST);

1014

}

1015

if(ret == EAI_SYSTEM){

1016

perror_plus("getnameinfo");

1017

} else if(ret != 0) {

1018

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

1019

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

1020

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

1021

}

1022

}

1023

1024

if(quit_now){

1025

errno = EINTR;

1026

goto mandos_end;

1027

}

1028

1029

while(true){

1030

if(af == AF_INET6){

1031

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

1032

sizeof(struct sockaddr_in6));

1033

} else {

1034

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

1035

sizeof(struct sockaddr_in));

1036

}

1037

if(ret < 0){

1038

if(errno == ENETUNREACH

1039

and if_index != AVAHI_IF_UNSPEC

1040

and connect_to == NULL

1041

and not route_added and

1042

((af == AF_INET6 and not

1043

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1044

&to)->sin6_addr)))

1045

or (af == AF_INET and

1046

/* Not a a IPv4LL address */

1047

(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)

1048

& 0xFFFF0000L) != 0xA9FE0000L))){

1049

/* Work around Avahi bug - Avahi does not announce link-local

1050

addresses if it has a global address, so local hosts with

1051

*only* a link-local address (e.g. Mandos clients) cannot

1052

connect to a Mandos server announced by Avahi on a server

1053

host with a global address. Work around this by retrying

1054

with an explicit route added with the server's address.

1055

1056

Avahi bug reference:

1057

http://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1058

https://bugs.debian.org/587961

1059

*/

1060

int e = errno;

1061

route_added = add_local_route(ip, if_index);

1062

if(route_added){

1063

continue;

1064

}

1065

errno = e;

1066

}

1067

if(errno != ECONNREFUSED or debug){

1068

int e = errno;

1069

perror_plus("connect");

1070

errno = e;

1071

}

1072

goto mandos_end;

1073

}

1074

1075

if(quit_now){

1076

errno = EINTR;

1077

goto mandos_end;

1078

}

1079

break;

781

1080

}

782

1081

783

1082

const char *out = mandos_protocol_version;

819

1118

goto mandos_end;

820

1119

}

821

1120

822

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

823

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1121

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

1122

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

1123

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

1124

gnutls_transport_set_ptr(session,

1125

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

824

1126

825

1127

if(quit_now){

826

1128

errno = EINTR;

931

1233

if(buffer_length > 0){

932

1234

ssize_t decrypted_buffer_size;

933

1235

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

934

&decrypted_buffer);

1236

&decrypted_buffer, mc);

935

1237

if(decrypted_buffer_size >= 0){

936

1238

937

1239

written = 0;

963

1265

964

1266

mandos_end:

965

1267

{

1268

if(route_added){

1269

if(not remove_local_route(ip, if_index)){

1270

fprintf_plus(stderr, "Failed to remove local route to %s on"

1271

" interface %d", ip, if_index);

1272

}

1273

}

966

1274

int e = errno;

967

1275

free(decrypted_buffer);

968

1276

free(buffer);

985

1293

return retval;

986

1294

}

987

1295

1296

__attribute__((nonnull))

988

1297

static void resolve_callback(AvahiSServiceResolver *r,

989

1298

AvahiIfIndex interface,

990

1299

AvahiProtocol proto,

998

1307

AVAHI_GCC_UNUSED AvahiStringList *txt,

999

1308

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1000

1309

flags,

1001

AVAHI_GCC_UNUSED void* userdata){

1002

assert(r);

1310

void *mc){

1311

if(r == NULL){

1312

return;

1313

}

1003

1314

1004

1315

/* Called whenever a service has been resolved successfully or

1005

1316

timed out */

1006

1317

1007

1318

if(quit_now){

1319

avahi_s_service_resolver_free(r);

1008

1320

return;

1009

1321

}

1010

1322

1014

1326

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

1015

1327

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

1016

1328

domain,

1017

avahi_strerror(avahi_server_errno(mc.server)));

1329

avahi_strerror(avahi_server_errno

1330

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

1018

1331

break;

1019

1332

1020

1333

case AVAHI_RESOLVER_FOUND:

1026

1339

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

1027

1340

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

1028

1341

}

1029

int ret = start_mandos_communication(ip, port, interface,

1030

avahi_proto_to_af(proto));

1342

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

1343

interface,

1344

avahi_proto_to_af(proto),

1345

mc);

1031

1346

if(ret == 0){

1032

avahi_simple_poll_quit(mc.simple_poll);

1347

avahi_simple_poll_quit(simple_poll);

1033

1348

} else {

1034

if(not add_server(ip, port, interface,

1035

avahi_proto_to_af(proto))){

1349

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

1350

avahi_proto_to_af(proto),

1351

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

1036

1352

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

1037

1353

" list\n", name);

1038

1354

}

1051

1367

const char *domain,

1052

1368

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1053

1369

flags,

1054

AVAHI_GCC_UNUSED void* userdata){

1055

assert(b);

1370

void *mc){

1371

if(b == NULL){

1372

return;

1373

}

1056

1374

1057

1375

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

1058

1376

is removed from the LAN */

1066

1384

case AVAHI_BROWSER_FAILURE:

1067

1385

1068

1386

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

1069

avahi_strerror(avahi_server_errno(mc.server)));

1070

avahi_simple_poll_quit(mc.simple_poll);

1387

avahi_strerror(avahi_server_errno

1388

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

1389

avahi_simple_poll_quit(simple_poll);

1071

1390

return;

1072

1391

1073

1392

case AVAHI_BROWSER_NEW:

1076

1395

the callback function is called the Avahi server will free the

1077

1396

resolver for us. */

1078

1397

1079

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

1080

name, type, domain, protocol, 0,

1081

resolve_callback, NULL) == NULL)

1398

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

1399

interface, protocol, name, type,

1400

domain, protocol, 0,

1401

resolve_callback, mc) == NULL)

1082

1402

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

1083

1403

" %s\n", name,

1084

avahi_strerror(avahi_server_errno(mc.server)));

1404

avahi_strerror(avahi_server_errno

1405

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

1085

1406

break;

1086

1407

1087

1408

case AVAHI_BROWSER_REMOVE:

1106

1427

signal_received = sig;

1107

1428

int old_errno = errno;

1108

1429

/* set main loop to exit */

1109

if(mc.simple_poll != NULL){

1110

avahi_simple_poll_quit(mc.simple_poll);

1430

if(simple_poll != NULL){

1431

avahi_simple_poll_quit(simple_poll);

1111

1432

}

1112

1433

errno = old_errno;

1113

1434

}

1114

1435

1436

__attribute__((nonnull, warn_unused_result))

1115

1437

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

1116

1438

int ret;

1439

error_t ret_errno;

1117

1440

1118

1441

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

1119

1442

if(s < 0){

1443

ret_errno = errno;

1120

1444

perror_plus("socket");

1445

errno = ret_errno;

1121

1446

return false;

1122

1447

}

1123

1448

strcpy(ifr->ifr_name, ifname);

1124

1449

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1125

1450

if(ret == -1){

1126

1451

if(debug){

1452

ret_errno = errno;

1127

1453

perror_plus("ioctl SIOCGIFFLAGS");

1454

errno = ret_errno;

1128

1455

}

1129

1456

return false;

1130

1457

}

1131

1458

return true;

1132

1459

}

1133

1460

1461

__attribute__((nonnull, warn_unused_result))

1134

1462

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

1135

1463

1136

1464

/* Reject the loopback device */

1178

1506

* corresponds to an acceptable network device.

1179

1507

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

1180

1508

*/

1509

__attribute__((nonnull, warn_unused_result))

1181

1510

int good_interface(const struct dirent *if_entry){

1182

1511

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

1183

1512

return 0;

1199

1528

}

1200

1529

1201

1530

/*

1202

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

1203

* corresponds to an acceptable network device which is up.

1204

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

1205

*/

1206

int up_interface(const struct dirent *if_entry){

1207

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

1208

return 0;

1209

}

1210

1211

struct ifreq ifr;

1212

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

1213

if(debug){

1214

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

1215

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

1216

}

1217

return 0;

1218

}

1219

1220

/* Reject down interfaces */

1221

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

1222

if(debug){

1223

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

1224

if_entry->d_name);

1225

}

1226

return 0;

1227

}

1228

1229

/* Reject non-running interfaces */

1230

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

1231

if(debug){

1232

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

1233

if_entry->d_name);

1234

}

1235

return 0;

1236

}

1237

1238

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

1239

return 0;

1240

}

1241

return 1;

1242

}

1243

1531

* This function determines if a network interface is up.

1532

*/

1533

__attribute__((nonnull, warn_unused_result))

1534

bool interface_is_up(const char *interface){

1535

struct ifreq ifr;

1536

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

1537

if(debug){

1538

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

1539

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

1540

}

1541

return false;

1542

}

1543

1544

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

1545

}

1546

1547

/*

1548

* This function determines if a network interface is running

1549

*/

1550

__attribute__((nonnull, warn_unused_result))

1551

bool interface_is_running(const char *interface){

1552

struct ifreq ifr;

1553

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

1554

if(debug){

1555

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

1556

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

1557

}

1558

return false;

1559

}

1560

1561

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

1562

}

1563

1564

__attribute__((nonnull, pure, warn_unused_result))

1244

1565

int notdotentries(const struct dirent *direntry){

1245

1566

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

1246

1567

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

1253

1574

}

1254

1575

1255

1576

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

1577

__attribute__((nonnull, warn_unused_result))

1256

1578

int runnable_hook(const struct dirent *direntry){

1257

1579

int ret;

1258

1580

size_t sret;

1266

1588

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

1267

1589

"abcdefghijklmnopqrstuvwxyz"

1268

1590

"0123456789"

1269

"_-");

1591

"_.-");

1270

1592

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

1271

1593

/* Contains non-allowed characters */

1272

1594

if(debug){

1276

1598

return 0;

1277

1599

}

1278

1600

1279

char *fullname = NULL;

1280

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

1281

if(ret < 0){

1282

perror_plus("asprintf");

1283

return 0;

1284

}

1285

1286

ret = stat(fullname, &st);

1601

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

1287

1602

if(ret == -1){

1288

1603

if(debug){

1289

1604

perror_plus("Could not stat hook");

1313

1628

return 1;

1314

1629

}

1315

1630

1316

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1631

__attribute__((nonnull, warn_unused_result))

1632

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1633

mandos_context *mc){

1317

1634

int ret;

1318

1635

struct timespec now;

1319

1636

struct timespec waited_time;

1320

1637

intmax_t block_time;

1321

1638

1322

1639

while(true){

1323

if(mc.current_server == NULL){

1324

if (debug){

1640

if(mc->current_server == NULL){

1641

if(debug){

1325

1642

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

1326

1643

" No timeout!\n");

1327

1644

}

1328

1645

ret = avahi_simple_poll_iterate(s, -1);

1329

1646

} else {

1330

if (debug){

1647

if(debug){

1331

1648

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

1332

1649

" it, or wait\n");

1333

1650

}

1340

1657

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

1341

1658

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

1342

1659

waited_time.tv_sec = (now.tv_sec

1343

- mc.current_server->last_seen.tv_sec);

1660

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

1344

1661

waited_time.tv_nsec = (now.tv_nsec

1345

- mc.current_server->last_seen.tv_nsec);

1662

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

1346

1663

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

1347

1664

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

1348

1665

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

1350

1667

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

1351

1668

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

1352

1669

1353

if (debug){

1670

if(debug){

1354

1671

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

1355

1672

block_time);

1356

1673

}

1357

1674

1358

1675

if(block_time <= 0){

1359

ret = start_mandos_communication(mc.current_server->ip,

1360

mc.current_server->port,

1361

mc.current_server->if_index,

1362

mc.current_server->af);

1676

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

1677

mc->current_server->port,

1678

mc->current_server->if_index,

1679

mc->current_server->af, mc);

1363

1680

if(ret == 0){

1364

avahi_simple_poll_quit(mc.simple_poll);

1681

avahi_simple_poll_quit(s);

1365

1682

return 0;

1366

1683

}

1367

1684

ret = clock_gettime(CLOCK_MONOTONIC,

1368

&mc.current_server->last_seen);

1685

&mc->current_server->last_seen);

1369

1686

if(ret == -1){

1370

1687

perror_plus("clock_gettime");

1371

1688

return -1;

1372

1689

}

1373

mc.current_server = mc.current_server->next;

1690

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

1374

1691

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

1375

1692

servers, but don't block */

1376

1693

}

1378

1695

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

1379

1696

}

1380

1697

if(ret != 0){

1381

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

1698

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

1382

1699

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

1383

1700

}

1384

1701

}

1385

1702

}

1386

1703

}

1387

1704

1388

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

1705

__attribute__((nonnull))

1706

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

1389

1707

const float delay){

1390

struct dirent **direntries;

1391

struct dirent *direntry;

1392

int ret;

1393

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

1394

alphasort);

1708

struct dirent **direntries = NULL;

1709

if(hookdir_fd == -1){

1710

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1711

| O_CLOEXEC);

1712

if(hookdir_fd == -1){

1713

if(errno == ENOENT){

1714

if(debug){

1715

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

1716

" found\n", hookdir);

1717

}

1718

} else {

1719

perror_plus("open");

1720

}

1721

return;

1722

}

1723

}

1724

#ifdef __GLIBC__

1725

#if __GLIBC_PREREQ(2, 15)

1726

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

1727

runnable_hook, alphasort);

1728

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

1729

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

1730

alphasort);

1731

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

1732

#else /* not __GLIBC__ */

1733

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

1734

alphasort);

1735

#endif /* not __GLIBC__ */

1395

1736

if(numhooks == -1){

1396

1737

perror_plus("scandir");

1397

} else {

1398

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

1399

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

1400

direntry = direntries[i];

1401

char *fullname = NULL;

1402

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

1403

if(ret < 0){

1738

return;

1739

}

1740

struct dirent *direntry;

1741

int ret;

1742

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

1743

if(devnull == -1){

1744

perror_plus("open(\"/dev/null\", O_RDONLY)");

1745

return;

1746

}

1747

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

1748

direntry = direntries[i];

1749

if(debug){

1750

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

1751

direntry->d_name);

1752

}

1753

pid_t hook_pid = fork();

1754

if(hook_pid == 0){

1755

/* Child */

1756

/* Raise privileges */

1757

errno = raise_privileges_permanently();

1758

if(errno != 0){

1759

perror_plus("Failed to raise privileges");

1760

_exit(EX_NOPERM);

1761

}

1762

/* Set group */

1763

errno = 0;

1764

ret = setgid(0);

1765

if(ret == -1){

1766

perror_plus("setgid");

1767

_exit(EX_NOPERM);

1768

}

1769

/* Reset supplementary groups */

1770

errno = 0;

1771

ret = setgroups(0, NULL);

1772

if(ret == -1){

1773

perror_plus("setgroups");

1774

_exit(EX_NOPERM);

1775

}

1776

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

1777

if(ret == -1){

1778

perror_plus("setenv");

1779

_exit(EX_OSERR);

1780

}

1781

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

1782

if(ret == -1){

1783

perror_plus("setenv");

1784

_exit(EX_OSERR);

1785

}

1786

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

1787

if(ret == -1){

1788

perror_plus("setenv");

1789

_exit(EX_OSERR);

1790

}

1791

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

1792

if(ret == -1){

1793

perror_plus("setenv");

1794

_exit(EX_OSERR);

1795

}

1796

char *delaystring;

1797

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

1798

if(ret == -1){

1404

1799

perror_plus("asprintf");

1405

continue;

1406

}

1407

if(debug){

1408

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

1409

direntry->d_name);

1410

}

1411

pid_t hook_pid = fork();

1412

if(hook_pid == 0){

1413

/* Child */

1414

/* Raise privileges */

1415

errno = 0;

1416

ret = seteuid(0);

1417

if(ret == -1){

1418

perror_plus("seteuid");

1419

}

1420

/* Raise privileges even more */

1421

errno = 0;

1422

ret = setuid(0);

1423

if(ret == -1){

1424

perror_plus("setuid");

1425

}

1426

/* Set group */

1427

errno = 0;

1428

ret = setgid(0);

1429

if(ret == -1){

1430

perror_plus("setgid");

1431

}

1432

/* Reset supplementary groups */

1433

errno = 0;

1434

ret = setgroups(0, NULL);

1435

if(ret == -1){

1436

perror_plus("setgroups");

1437

}

1438

dup2(devnull, STDIN_FILENO);

1439

close(devnull);

1440

dup2(STDERR_FILENO, STDOUT_FILENO);

1441

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

1442

if(ret == -1){

1443

perror_plus("setenv");

1444

_exit(EX_OSERR);

1445

}

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

char *delaystring;

1462

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

1463

if(ret == -1){

1464

perror_plus("asprintf");

1465

_exit(EX_OSERR);

1466

}

1467

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

1468

if(ret == -1){

1469

free(delaystring);

1470

perror_plus("setenv");

1471

_exit(EX_OSERR);

1472

}

1800

_exit(EX_OSERR);

1801

}

1802

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

1803

if(ret == -1){

1473

1804

free(delaystring);

1474

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

1475

perror_plus("execl");

1476

_exit(EXIT_FAILURE);

1477

}

1478

} else {

1479

int status;

1480

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

1481

perror_plus("waitpid");

1482

free(fullname);

1483

continue;

1484

}

1485

if(WIFEXITED(status)){

1486

if(WEXITSTATUS(status) != 0){

1487

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

1488

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

1489

WEXITSTATUS(status));

1490

free(fullname);

1491

continue;

1492

}

1493

} else if(WIFSIGNALED(status)){

1494

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

1495

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

1496

WTERMSIG(status));

1497

free(fullname);

1498

continue;

1499

} else {

1500

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

1501

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

1502

free(fullname);

1503

continue;

1504

}

1505

}

1506

free(fullname);

1507

if(debug){

1508

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

1509

direntry->d_name);

1510

}

1511

}

1512

close(devnull);

1513

}

1514

return true;

1805

perror_plus("setenv");

1806

_exit(EX_OSERR);

1807

}

1808

free(delaystring);

1809

if(connect_to != NULL){

1810

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

1811

if(ret == -1){

1812

perror_plus("setenv");

1813

_exit(EX_OSERR);

1814

}

1815

}

1816

int hook_fd = TEMP_FAILURE_RETRY(openat(hookdir_fd,

1817

direntry->d_name,

1818

O_RDONLY));

1819

if(hook_fd == -1){

1820

perror_plus("openat");

1821

_exit(EXIT_FAILURE);

1822

}

1823

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

1824

perror_plus("close");

1825

_exit(EXIT_FAILURE);

1826

}

1827

ret = dup2(devnull, STDIN_FILENO);

1828

if(ret == -1){

1829

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

1830

_exit(EX_OSERR);

1831

}

1832

ret = close(devnull);

1833

if(ret == -1){

1834

perror_plus("close");

1835

_exit(EX_OSERR);

1836

}

1837

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1838

if(ret == -1){

1839

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

1840

_exit(EX_OSERR);

1841

}

1842

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

1843

environ) == -1){

1844

perror_plus("fexecve");

1845

_exit(EXIT_FAILURE);

1846

}

1847

} else {

1848

if(hook_pid == -1){

1849

perror_plus("fork");

1850

free(direntry);

1851

continue;

1852

}

1853

int status;

1854

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

1855

perror_plus("waitpid");

1856

free(direntry);

1857

continue;

1858

}

1859

if(WIFEXITED(status)){

1860

if(WEXITSTATUS(status) != 0){

1861

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

1862

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

1863

WEXITSTATUS(status));

1864

free(direntry);

1865

continue;

1866

}

1867

} else if(WIFSIGNALED(status)){

1868

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

1869

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

1870

WTERMSIG(status));

1871

free(direntry);

1872

continue;

1873

} else {

1874

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

1875

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

1876

free(direntry);

1877

continue;

1878

}

1879

}

1880

if(debug){

1881

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

1882

direntry->d_name);

1883

}

1884

free(direntry);

1885

}

1886

free(direntries);

1887

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

1888

perror_plus("close");

1889

} else {

1890

hookdir_fd = -1;

1891

}

1892

close(devnull);

1893

}

1894

1895

__attribute__((nonnull, warn_unused_result))

1896

error_t bring_up_interface(const char *const interface,

1897

const float delay){

1898

error_t old_errno = errno;

1899

int ret;

1900

struct ifreq network;

1901

unsigned int if_index = if_nametoindex(interface);

1902

if(if_index == 0){

1903

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

1904

errno = old_errno;

1905

return ENXIO;

1906

}

1907

1908

if(quit_now){

1909

errno = old_errno;

1910

return EINTR;

1911

}

1912

1913

if(not interface_is_up(interface)){

1914

error_t ret_errno = 0, ioctl_errno = 0;

1915

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

1916

ret_errno = errno;

1917

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

1918

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

1919

errno = old_errno;

1920

return ret_errno;

1921

}

1922

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

1923

1924

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

1925

if(sd == -1){

1926

ret_errno = errno;

1927

perror_plus("socket");

1928

errno = old_errno;

1929

return ret_errno;

1930

}

1931

1932

if(quit_now){

1933

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

1934

if(ret == -1){

1935

perror_plus("close");

1936

}

1937

errno = old_errno;

1938

return EINTR;

1939

}

1940

1941

if(debug){

1942

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

1943

interface);

1944

}

1945

1946

/* Raise privileges */

1947

ret_errno = raise_privileges();

1948

if(ret_errno != 0){

1949

errno = ret_errno;

1950

perror_plus("Failed to raise privileges");

1951

}

1952

1953

#ifdef __linux__

1954

int ret_linux;

1955

bool restore_loglevel = false;

1956

if(ret_errno == 0){

1957

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1958

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

1959

ret_linux = klogctl(8, NULL, 5);

1960

if(ret_linux == -1){

1961

perror_plus("klogctl");

1962

} else {

1963

restore_loglevel = true;

1964

}

1965

}

1966

#endif /* __linux__ */

1967

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

1968

ioctl_errno = errno;

1969

#ifdef __linux__

1970

if(restore_loglevel){

1971

ret_linux = klogctl(7, NULL, 0);

1972

if(ret_linux == -1){

1973

perror_plus("klogctl");

1974

}

1975

}

1976

#endif /* __linux__ */

1977

1978

/* If raise_privileges() succeeded above */

1979

if(ret_errno == 0){

1980

/* Lower privileges */

1981

ret_errno = lower_privileges();

1982

if(ret_errno != 0){

1983

errno = ret_errno;

1984

perror_plus("Failed to lower privileges");

1985

}

1986

}

1987

1988

/* Close the socket */

1989

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

1990

if(ret == -1){

1991

perror_plus("close");

1992

}

1993

1994

if(ret_setflags == -1){

1995

errno = ioctl_errno;

1996

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1997

errno = old_errno;

1998

return ioctl_errno;

1999

}

2000

} else if(debug){

2001

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

2002

interface);

2003

}

2004

2005

/* Sleep checking until interface is running.

2006

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

2007

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

2008

if(interface_is_running(interface)){

2009

break;

2010

}

2011

struct timespec sleeptime = { .tv_nsec = 250000000 };

2012

ret = nanosleep(&sleeptime, NULL);

2013

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

2014

perror_plus("nanosleep");

2015

}

2016

}

2017

2018

errno = old_errno;

2019

return 0;

2020

}

2021

2022

__attribute__((nonnull, warn_unused_result))

2023

error_t take_down_interface(const char *const interface){

2024

error_t old_errno = errno;

2025

struct ifreq network;

2026

unsigned int if_index = if_nametoindex(interface);

2027

if(if_index == 0){

2028

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

2029

errno = old_errno;

2030

return ENXIO;

2031

}

2032

if(interface_is_up(interface)){

2033

error_t ret_errno = 0, ioctl_errno = 0;

2034

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

2035

ret_errno = errno;

2036

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

2037

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

2038

errno = old_errno;

2039

return ret_errno;

2040

}

2041

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

2042

2043

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

2044

if(sd == -1){

2045

ret_errno = errno;

2046

perror_plus("socket");

2047

errno = old_errno;

2048

return ret_errno;

2049

}

2050

2051

if(debug){

2052

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

2053

interface);

2054

}

2055

2056

/* Raise privileges */

2057

ret_errno = raise_privileges();

2058

if(ret_errno != 0){

2059

errno = ret_errno;

2060

perror_plus("Failed to raise privileges");

2061

}

2062

2063

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

2064

ioctl_errno = errno;

2065

2066

/* If raise_privileges() succeeded above */

2067

if(ret_errno == 0){

2068

/* Lower privileges */

2069

ret_errno = lower_privileges();

2070

if(ret_errno != 0){

2071

errno = ret_errno;

2072

perror_plus("Failed to lower privileges");

2073

}

2074

}

2075

2076

/* Close the socket */

2077

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

2078

if(ret == -1){

2079

perror_plus("close");

2080

}

2081

2082

if(ret_setflags == -1){

2083

errno = ioctl_errno;

2084

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2085

errno = old_errno;

2086

return ioctl_errno;

2087

}

2088

} else if(debug){

2089

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

2090

interface);

2091

}

2092

2093

errno = old_errno;

2094

return 0;

1515

2095

}

1516

2096

1517

2097

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

2098

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

2099

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

2100

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

2101

.interfaces = NULL, .interfaces_size = 0 };

1518

2102

AvahiSServiceBrowser *sb = NULL;

1519

int error;

2103

error_t ret_errno;

1520

2104

int ret;

1521

2105

intmax_t tmpmax;

1522

2106

char *tmp;

1523

2107

int exitcode = EXIT_SUCCESS;

1524

const char *interface = "";

1525

struct ifreq network;

1526

int sd = -1;

1527

bool take_down_interface = false;

1528

uid_t uid;

1529

gid_t gid;

1530

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

1531

bool tempdir_created = false;

2108

char *interfaces_to_take_down = NULL;

2109

size_t interfaces_to_take_down_size = 0;

2110

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

2111

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

2112

char *tempdir = NULL;

1532

2113

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1533

2114

const char *seckey = PATHDIR "/" SECKEY;

1534

2115

const char *pubkey = PATHDIR "/" PUBKEY;

2116

char *interfaces_hooks = NULL;

1535

2117

1536

2118

bool gnutls_initialized = false;

1537

2119

bool gpgme_initialized = false;

1599

2181

.group = 2 },

1600

2182

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

1601

2183

.arg = "SECONDS",

1602

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

2184

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

1603

2185

.group = 2 },

1604

2186

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

1605

2187

.arg = "DIR",

1628

2210

connect_to = arg;

1629

2211

break;

1630

2212

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

1631

interface = arg;

2213

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

2214

arg, (int)',');

2215

if(ret_errno != 0){

2216

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

2217

}

1632

2218

break;

1633

2219

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

1634

2220

seckey = arg;

1706

2292

goto end;

1707

2293

}

1708

2294

}

1709

2295

1710

2296

{

1711

2297

/* Work around Debian bug #633582:

1712

2298

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

1713

2299

1714

/* Re-raise priviliges */

1715

errno = 0;

1716

ret = seteuid(0);

1717

if(ret == -1){

1718

perror_plus("seteuid");

2300

/* Re-raise privileges */

2301

ret_errno = raise_privileges();

2302

if(ret_errno != 0){

2303

errno = ret_errno;

2304

perror_plus("Failed to raise privileges");

1719

2305

} else {

1720

2306

struct stat st;

1721

2307

1739

2325

TEMP_FAILURE_RETRY(close(seckey_fd));

1740

2326

}

1741

2327

}

1742

2328

1743

2329

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

1744

2330

int pubkey_fd = open(pubkey, O_RDONLY);

1745

2331

if(pubkey_fd == -1){

1760

2346

TEMP_FAILURE_RETRY(close(pubkey_fd));

1761

2347

}

1762

2348

}

1763

2349

1764

2350

/* Lower privileges */

1765

errno = 0;

1766

ret = seteuid(uid);

1767

if(ret == -1){

1768

perror_plus("seteuid");

2351

ret_errno = lower_privileges();

2352

if(ret_errno != 0){

2353

errno = ret_errno;

2354

perror_plus("Failed to lower privileges");

2355

}

2356

}

2357

}

2358

2359

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

2360

{

2361

char *interface = NULL;

2362

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

2363

interface))){

2364

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

2365

and if_nametoindex(interface) == 0){

2366

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

2367

fprintf_plus(stderr, "Not using nonexisting interface"

2368

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

2369

}

2370

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

2371

interface = NULL;

1769

2372

}

1770

2373

}

1771

2374

}

1772

2375

1773

2376

/* Run network hooks */

1774

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

1775

goto end;

2377

{

2378

if(mc.interfaces != NULL){

2379

interfaces_hooks = malloc(mc.interfaces_size);

2380

if(interfaces_hooks == NULL){

2381

perror_plus("malloc");

2382

goto end;

2383

}

2384

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

2385

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

2386

}

2387

run_network_hooks("start", interfaces_hooks != NULL ?

2388

interfaces_hooks : "", delay);

1776

2389

}

1777

2390

1778

2391

if(not debug){

1779

2392

avahi_set_log_function(empty_log);

1780

2393

}

1781

2394

1782

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

1783

struct dirent **direntries;

1784

/* First look for interfaces that are up */

1785

ret = scandir(sys_class_net, &direntries, up_interface,

1786

alphasort);

1787

if(ret == 0){

1788

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

1789

free(direntries);

1790

ret = scandir(sys_class_net, &direntries, good_interface,

1791

alphasort);

1792

}

1793

if(ret >= 1){

1794

/* Pick the first interface returned */

1795

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

1796

if(debug){

1797

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

1798

}

1799

if(interface == NULL){

1800

perror_plus("malloc");

1801

free(direntries);

1802

exitcode = EXIT_FAILURE;

1803

goto end;

1804

}

1805

free(direntries);

1806

} else {

1807

free(direntries);

1808

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

1809

exitcode = EXIT_FAILURE;

1810

goto end;

1811

}

1812

}

1813

1814

2395

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

1815

2396

from the signal handler */

1816

2397

/* Initialize the pseudo-RNG for Avahi */

1817

2398

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

1818

mc.simple_poll = avahi_simple_poll_new();

1819

if(mc.simple_poll == NULL){

2399

simple_poll = avahi_simple_poll_new();

2400

if(simple_poll == NULL){

1820

2401

fprintf_plus(stderr,

1821

2402

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

1822

2403

exitcode = EX_UNAVAILABLE;

1886

2467

}

1887

2468

}

1888

2469

1889

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

1890

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

1891

if_index = (AvahiIfIndex) if_nametoindex(interface);

1892

if(if_index == 0){

1893

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

1894

exitcode = EX_UNAVAILABLE;

1895

goto end;

1896

}

1897

1898

if(quit_now){

1899

goto end;

1900

}

1901

1902

/* Re-raise priviliges */

1903

errno = 0;

1904

ret = seteuid(0);

1905

if(ret == -1){

1906

perror_plus("seteuid");

1907

}

1908

1909

#ifdef __linux__

1910

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1911

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

1912

ret = klogctl(8, NULL, 5);

1913

bool restore_loglevel = true;

1914

if(ret == -1){

1915

restore_loglevel = false;

1916

perror_plus("klogctl");

1917

}

1918

#endif /* __linux__ */

1919

1920

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1921

if(sd < 0){

1922

perror_plus("socket");

1923

exitcode = EX_OSERR;

1924

#ifdef __linux__

1925

if(restore_loglevel){

1926

ret = klogctl(7, NULL, 0);

1927

if(ret == -1){

1928

perror_plus("klogctl");

1929

}

1930

}

1931

#endif /* __linux__ */

1932

/* Lower privileges */

1933

errno = 0;

1934

ret = seteuid(uid);

1935

if(ret == -1){

1936

perror_plus("seteuid");

1937

}

1938

goto end;

1939

}

1940

strcpy(network.ifr_name, interface);

1941

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

1942

if(ret == -1){

1943

perror_plus("ioctl SIOCGIFFLAGS");

1944

#ifdef __linux__

1945

if(restore_loglevel){

1946

ret = klogctl(7, NULL, 0);

1947

if(ret == -1){

1948

perror_plus("klogctl");

1949

}

1950

}

1951

#endif /* __linux__ */

1952

exitcode = EX_OSERR;

1953

/* Lower privileges */

1954

errno = 0;

1955

ret = seteuid(uid);

1956

if(ret == -1){

1957

perror_plus("seteuid");

1958

}

1959

goto end;

1960

}

1961

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

1962

network.ifr_flags |= IFF_UP;

1963

take_down_interface = true;

1964

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

1965

if(ret == -1){

1966

take_down_interface = false;

1967

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1968

exitcode = EX_OSERR;

1969

#ifdef __linux__

1970

if(restore_loglevel){

1971

ret = klogctl(7, NULL, 0);

1972

if(ret == -1){

1973

perror_plus("klogctl");

2470

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

2471

if(mc.interfaces == NULL){

2472

struct dirent **direntries = NULL;

2473

/* Look for any good interfaces */

2474

ret = scandir(sys_class_net, &direntries, good_interface,

2475

alphasort);

2476

if(ret >= 1){

2477

/* Add all found interfaces to interfaces list */

2478

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

2479

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

2480

direntries[i]->d_name);

2481

if(ret_errno != 0){

2482

errno = ret_errno;

2483

perror_plus("argz_add");

2484

free(direntries[i]);

2485

continue;

2486

}

2487

if(debug){

2488

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

2489

direntries[i]->d_name);

2490

}

2491

free(direntries[i]);

2492

}

2493

free(direntries);

2494

} else {

2495

if(ret == 0){

2496

free(direntries);

2497

}

2498

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

2499

exitcode = EXIT_FAILURE;

2500

goto end;

2501

}

2502

}

2503

2504

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

2505

{

2506

char *interface = NULL;

2507

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

2508

interface))){

2509

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

2510

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

2511

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

2512

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

2513

interface);

2514

interface = NULL;

2515

while((interface = argz_next(mc.interfaces,

2516

mc.interfaces_size, interface))){

2517

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

2518

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

2519

interface);

2520

interface = NULL;

1974

2521

}

1975

2522

}

1976

#endif /* __linux__ */

1977

/* Lower privileges */

1978

errno = 0;

1979

ret = seteuid(uid);

1980

if(ret == -1){

1981

perror_plus("seteuid");

1982

}

1983

goto end;

1984

}

1985

}

1986

/* Sleep checking until interface is running.

1987

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

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("ioctl SIOCGIFFLAGS");

1992

} else if(network.ifr_flags & IFF_RUNNING){

1993

2523

break;

1994

2524

}

1995

struct timespec sleeptime = { .tv_nsec = 250000000 };

1996

ret = nanosleep(&sleeptime, NULL);

1997

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

1998

perror_plus("nanosleep");

1999

}

2000

}

2001

if(not take_down_interface){

2002

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

2003

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

2004

if(ret == -1){

2005

perror_plus("close");

2006

}

2007

}

2008

#ifdef __linux__

2009

if(restore_loglevel){

2010

/* Restores kernel loglevel to default */

2011

ret = klogctl(7, NULL, 0);

2012

if(ret == -1){

2013

perror_plus("klogctl");

2014

}

2015

}

2016

#endif /* __linux__ */

2017

/* Lower privileges */

2018

errno = 0;

2019

/* Lower privileges */

2020

ret = seteuid(uid);

2021

if(ret == -1){

2022

perror_plus("seteuid");

2023

}

2525

bool interface_was_up = interface_is_up(interface);

2526

errno = bring_up_interface(interface, delay);

2527

if(not interface_was_up){

2528

if(errno != 0){

2529

perror_plus("Failed to bring up interface");

2530

} else {

2531

errno = argz_add(&interfaces_to_take_down,

2532

&interfaces_to_take_down_size,

2533

interface);

2534

if(errno != 0){

2535

perror_plus("argz_add");

2536

}

2537

}

2538

}

2539

}

2540

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

2541

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

2542

}

2543

}

2544

2545

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

2546

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

2547

if(debug){

2548

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

2549

mc.interfaces);

2550

}

2551

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

2024

2552

}

2025

2553

2026

2554

if(quit_now){

2027

2555

goto end;

2028

2556

}

2029

2557

2030

ret = init_gnutls_global(pubkey, seckey);

2558

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

2031

2559

if(ret == -1){

2032

2560

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

2033

2561

exitcode = EX_UNAVAILABLE;

2040

2568

goto end;

2041

2569

}

2042

2570

2043

if(mkdtemp(tempdir) == NULL){

2571

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

2572

tempdir = mkdtemp(run_tempdir);

2573

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

2574

if(debug){

2575

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

2576

run_tempdir, old_tempdir);

2577

}

2578

tempdir = mkdtemp(old_tempdir);

2579

}

2580

if(tempdir == NULL){

2044

2581

perror_plus("mkdtemp");

2045

2582

goto end;

2046

2583

}

2047

tempdir_created = true;

2048

2584

2049

2585

if(quit_now){

2050

2586

goto end;

2051

2587

}

2052

2588

2053

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

2589

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

2054

2590

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

2055

2591

exitcode = EX_UNAVAILABLE;

2056

2592

goto end;

2066

2602

/* Connect directly, do not use Zeroconf */

2067

2603

/* (Mainly meant for debugging) */

2068

2604

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

2605

2069

2606

if(address == NULL){

2070

2607

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

2071

2608

exitcode = EX_USAGE;

2076

2613

goto end;

2077

2614

}

2078

2615

2079

uint16_t port;

2616

in_port_t port;

2080

2617

errno = 0;

2081

2618

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

2082

2619

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

2083

or tmpmax != (uint16_t)tmpmax){

2620

or tmpmax != (in_port_t)tmpmax){

2084

2621

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

2085

2622

exitcode = EX_USAGE;

2086

2623

goto end;

2087

2624

}

2088

2625

2089

2626

if(quit_now){

2090

2627

goto end;

2091

2628

}

2092

2629

2093

port = (uint16_t)tmpmax;

2630

port = (in_port_t)tmpmax;

2094

2631

*address = '\0';

2095

2632

/* Colon in address indicates IPv6 */

2096

2633

int af;

2112

2649

}

2113

2650

2114

2651

while(not quit_now){

2115

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

2652

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

2653

&mc);

2116

2654

if(quit_now or ret == 0){

2117

2655

break;

2118

2656

}

2120

2658

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

2121

2659

(int)retry_interval);

2122

2660

}

2123

sleep((int)retry_interval);

2661

sleep((unsigned int)retry_interval);

2124

2662

}

2125

2663

2126

if (not quit_now){

2664

if(not quit_now){

2127

2665

exitcode = EXIT_SUCCESS;

2128

2666

}

2129

2667

2144

2682

config.publish_domain = 0;

2145

2683

2146

2684

/* Allocate a new server */

2147

mc.server = avahi_server_new(avahi_simple_poll_get

2148

(mc.simple_poll), &config, NULL,

2149

NULL, &error);

2685

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2686

&config, NULL, NULL, &ret_errno);

2150

2687

2151

2688

/* Free the Avahi configuration data */

2152

2689

avahi_server_config_free(&config);

2155

2692

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

2156

2693

if(mc.server == NULL){

2157

2694

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

2158

avahi_strerror(error));

2695

avahi_strerror(ret_errno));

2159

2696

exitcode = EX_UNAVAILABLE;

2160

2697

goto end;

2161

2698

}

2167

2704

/* Create the Avahi service browser */

2168

2705

sb = avahi_s_service_browser_new(mc.server, if_index,

2169

2706

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2170

NULL, 0, browse_callback, NULL);

2707

NULL, 0, browse_callback,

2708

(void *)&mc);

2171

2709

if(sb == NULL){

2172

2710

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

2173

2711

avahi_strerror(avahi_server_errno(mc.server)));

2184

2722

if(debug){

2185

2723

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

2186

2724

}

2187

2188

ret = avahi_loop_with_timeout(mc.simple_poll,

2189

(int)(retry_interval * 1000));

2725

2726

ret = avahi_loop_with_timeout(simple_poll,

2727

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

2190

2728

if(debug){

2191

2729

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

2192

2730

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

2199

2737

}

2200

2738

2201

2739

/* Cleanup things */

2740

free(mc.interfaces);

2741

2202

2742

if(sb != NULL)

2203

2743

avahi_s_service_browser_free(sb);

2204

2744

2205

2745

if(mc.server != NULL)

2206

2746

avahi_server_free(mc.server);

2207

2747

2208

if(mc.simple_poll != NULL)

2209

avahi_simple_poll_free(mc.simple_poll);

2748

if(simple_poll != NULL)

2749

avahi_simple_poll_free(simple_poll);

2210

2750

2211

2751

if(gnutls_initialized){

2212

2752

gnutls_certificate_free_credentials(mc.cred);

2224

2764

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

2225

2765

while(mc.current_server != NULL){

2226

2766

server *next = mc.current_server->next;

2767

#ifdef __GNUC__

2768

#pragma GCC diagnostic push

2769

#pragma GCC diagnostic ignored "-Wcast-qual"

2770

#endif

2771

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

2772

#ifdef __GNUC__

2773

#pragma GCC diagnostic pop

2774

#endif

2227

2775

free(mc.current_server);

2228

2776

mc.current_server = next;

2229

2777

}

2230

2778

}

2231

2779

2232

/* Run network hooks */

2233

run_network_hooks("stop", interface, delay);

2234

2235

/* Re-raise priviliges */

2780

/* Re-raise privileges */

2236

2781

{

2237

errno = 0;

2238

ret = seteuid(0);

2239

if(ret == -1){

2240

perror_plus("seteuid");

2782

ret_errno = raise_privileges();

2783

if(ret_errno != 0){

2784

errno = ret_errno;

2785

perror_plus("Failed to raise privileges");

2786

} else {

2787

2788

/* Run network hooks */

2789

run_network_hooks("stop", interfaces_hooks != NULL ?

2790

interfaces_hooks : "", delay);

2791

2792

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

2793

{

2794

char *interface = NULL;

2795

while((interface=argz_next(interfaces_to_take_down,

2796

interfaces_to_take_down_size,

2797

interface))){

2798

ret_errno = take_down_interface(interface);

2799

if(ret_errno != 0){

2800

errno = ret_errno;

2801

perror_plus("Failed to take down interface");

2802

}

2803

}

2804

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

2805

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

2806

" down\n");

2807

}

2808

}

2241

2809

}

2242

2810

2243

/* Take down the network interface */

2244

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

2245

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

2246

if(ret == -1){

2247

perror_plus("ioctl SIOCGIFFLAGS");

2248

} else if(network.ifr_flags & IFF_UP){

2249

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

2250

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

2251

if(ret == -1){

2252

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2253

}

2254

}

2255

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

2256

if(ret == -1){

2257

perror_plus("close");

2258

}

2811

ret_errno = lower_privileges_permanently();

2812

if(ret_errno != 0){

2813

errno = ret_errno;

2814

perror_plus("Failed to lower privileges permanently");

2259

2815

}

2260

2816

}

2261

/* Lower privileges permanently */

2262

errno = 0;

2263

ret = setuid(uid);

2264

if(ret == -1){

2265

perror_plus("setuid");

2266

}

2817

2818

free(interfaces_to_take_down);

2819

free(interfaces_hooks);

2267

2820

2268

2821

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

2269

if(tempdir_created){

2822

if(tempdir != NULL){

2270

2823

struct dirent **direntries = NULL;

2271

struct dirent *direntry = NULL;

2272

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

2273

alphasort);

2274

if (numentries > 0){

2275

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

2276

direntry = direntries[i];

2277

char *fullname = NULL;

2278

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

2279

direntry->d_name);

2280

if(ret < 0){

2281

perror_plus("asprintf");

2282

continue;

2283

}

2284

ret = remove(fullname);

2285

if(ret == -1){

2286

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

2287

strerror(errno));

2288

}

2289

free(fullname);

2824

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

2825

| O_NOFOLLOW

2826

| O_DIRECTORY

2827

| O_PATH));

2828

if(tempdir_fd == -1){

2829

perror_plus("open");

2830

} else {

2831

#ifdef __GLIBC__

2832

#if __GLIBC_PREREQ(2, 15)

2833

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

2834

notdotentries, alphasort);

2835

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

2836

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

2837

alphasort);

2838

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

2839

#else /* not __GLIBC__ */

2840

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

2841

alphasort);

2842

#endif /* not __GLIBC__ */

2843

if(numentries >= 0){

2844

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

2845

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

2846

if(ret == -1){

2847

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

2848

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

2849

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

2850

}

2851

free(direntries[i]);

2852

}

2853

2854

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

2855

free(direntries);

2856

if(numentries == -1){

2857

perror_plus("scandir");

2858

}

2859

ret = rmdir(tempdir);

2860

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

2861

perror_plus("rmdir");

2862

}

2290

2863

}

2291

}

2292

2293

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

2294

free(direntries);

2295

if (numentries == -1){

2296

perror_plus("scandir");

2297

}

2298

ret = rmdir(tempdir);

2299

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

2300

perror_plus("rmdir");

2864

TEMP_FAILURE_RETRY(close(tempdir_fd));

2301

2865

}

2302

2866

}

2303

2867