/mandos/trunk : revision 738.1.3

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() */

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(),

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect() */

59

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

61

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

61

62

*/

62

63

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

63

64

strtoimax() */

64

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

65

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

66

program_invocation_short_name */

67

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

73

*/

74

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

75

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

76

setgid(), pause(), _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,

92

93

argz_delete(), argz_append(),

93

94

argz_stringify(), argz_add(),

94

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

95

98

96

99

#ifdef __linux__

97

100

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

139

142

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

140

143

char *connect_to = NULL;

141

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

142

146

uid_t uid = 65534;

143

147

gid_t gid = 65534;

144

148

145

149

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

146

150

typedef struct server{

147

151

const char *ip;

148

uint16_t port;

152

in_port_t port;

149

153

AvahiIfIndex if_index;

150

154

int af;

151

155

struct timespec last_seen;

155

159

156

160

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

157

161

typedef struct {

158

AvahiSimplePoll *simple_poll;

159

162

AvahiServer *server;

160

163

gnutls_certificate_credentials_t cred;

161

164

unsigned int dh_bits;

163

166

const char *priority;

164

167

gpgme_ctx_t ctx;

165

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

166

171

} mandos_context;

167

172

168

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

169

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

170

.dh_bits = 1024, .priority = "SECURE256"

171

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

172

.current_server = NULL };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

173

175

174

176

sig_atomic_t quit_now = 0;

175

177

int signal_received = 0;

183

185

perror(print_text);

184

186

}

185

187

186

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

188

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

187

189

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

188

190

va_list ap;

189

191

va_start (ap, format);

190

192

191

193

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

192

194

program_invocation_short_name));

193

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

195

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

194

196

}

195

197

196

198

/*

198

200

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

199

201

* "buffer_length" is how much is already used.

200

202

*/

203

__attribute__((nonnull, warn_unused_result))

201

204

size_t incbuffer(char **buffer, size_t buffer_length,

202

205

size_t buffer_capacity){

203

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

204

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

205

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;

206

213

return 0;

207

214

}

215

*buffer = new_buf;

208

216

buffer_capacity += BUFFER_SIZE;

209

217

}

210

218

return buffer_capacity;

211

219

}

212

220

213

221

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

214

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

215

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){

216

225

int ret;

217

226

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

218

227

if(new_server == NULL){

225

234

.af = af };

226

235

if(new_server->ip == NULL){

227

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);

228

252

return false;

229

253

}

230

254

/* Special case of first server */

231

if (mc.current_server == NULL){

255

if(*current_server == NULL){

232

256

new_server->next = new_server;

233

257

new_server->prev = new_server;

234

mc.current_server = new_server;

235

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

258

*current_server = new_server;

236

259

} else {

237

new_server->next = mc.current_server;

238

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;

239

263

new_server->prev->next = new_server;

240

mc.current_server->prev = new_server;

241

}

242

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

243

if(ret == -1){

244

perror_plus("clock_gettime");

245

return false;

264

(*current_server)->prev = new_server;

246

265

}

247

266

return true;

248

267

}

250

269

/*

251

270

* Initialize GPGME.

252

271

*/

253

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

254

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){

255

277

gpgme_error_t rc;

256

278

gpgme_engine_info_t engine_info;

257

279

258

259

280

/*

260

281

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

261

282

*/

262

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

263

284

int ret;

264

285

int fd;

265

286

gpgme_data_t pgp_data;

277

298

return false;

278

299

}

279

300

280

rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

281

302

if(rc != GPG_ERR_NO_ERROR){

282

303

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

283

304

gpgme_strsource(rc), gpgme_strerror(rc));

327

348

}

328

349

329

350

/* Create new GPGME "context" */

330

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

351

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

331

352

if(rc != GPG_ERR_NO_ERROR){

332

353

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

333

354

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

346

367

* Decrypt OpenPGP data.

347

368

* Returns -1 on error

348

369

*/

370

__attribute__((nonnull, warn_unused_result))

349

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

350

372

size_t crypto_size,

351

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

352

375

gpgme_data_t dh_crypto, dh_plain;

353

376

gpgme_error_t rc;

354

377

ssize_t ret;

380

403

381

404

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

382

405

data buffer */

383

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

406

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

384

407

if(rc != GPG_ERR_NO_ERROR){

385

408

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

386

409

gpgme_strsource(rc), gpgme_strerror(rc));

387

410

plaintext_length = -1;

388

411

if(debug){

389

412

gpgme_decrypt_result_t result;

390

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

391

414

if(result == NULL){

392

415

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

393

416

} else {

470

493

return plaintext_length;

471

494

}

472

495

473

static const char * safer_gnutls_strerror(int value){

474

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

475

-Wunreachable-code */

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

476

499

if(ret == NULL)

477

500

ret = "(unknown)";

478

501

return ret;

479

502

}

480

503

481

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

482

506

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

483

507

const char* string){

484

508

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

485

509

}

486

510

511

__attribute__((nonnull, warn_unused_result))

487

512

static int init_gnutls_global(const char *pubkeyfilename,

488

const char *seckeyfilename){

513

const char *seckeyfilename,

514

mandos_context *mc){

489

515

int ret;

490

516

491

517

if(debug){

508

534

}

509

535

510

536

/* OpenPGP credentials */

511

ret = gnutls_certificate_allocate_credentials(&mc.cred);

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

512

538

if(ret != GNUTLS_E_SUCCESS){

513

539

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

514

540

safer_gnutls_strerror(ret));

524

550

}

525

551

526

552

ret = gnutls_certificate_set_openpgp_key_file

527

(mc.cred, pubkeyfilename, seckeyfilename,

553

(mc->cred, pubkeyfilename, seckeyfilename,

528

554

GNUTLS_OPENPGP_FMT_BASE64);

529

555

if(ret != GNUTLS_E_SUCCESS){

530

556

fprintf_plus(stderr,

536

562

}

537

563

538

564

/* GnuTLS server initialization */

539

ret = gnutls_dh_params_init(&mc.dh_params);

565

ret = gnutls_dh_params_init(&mc->dh_params);

540

566

if(ret != GNUTLS_E_SUCCESS){

541

567

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

542

568

" initialization: %s\n",

543

569

safer_gnutls_strerror(ret));

544

570

goto globalfail;

545

571

}

546

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

572

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

547

573

if(ret != GNUTLS_E_SUCCESS){

548

574

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

549

575

safer_gnutls_strerror(ret));

550

576

goto globalfail;

551

577

}

552

578

553

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

579

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

554

580

555

581

return 0;

556

582

557

583

globalfail:

558

584

559

gnutls_certificate_free_credentials(mc.cred);

585

gnutls_certificate_free_credentials(mc->cred);

560

586

gnutls_global_deinit();

561

gnutls_dh_params_deinit(mc.dh_params);

587

gnutls_dh_params_deinit(mc->dh_params);

562

588

return -1;

563

589

}

564

590

565

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){

566

594

int ret;

567

595

/* GnuTLS session creation */

568

596

do {

580

608

{

581

609

const char *err;

582

610

do {

583

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

611

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

584

612

if(quit_now){

585

613

gnutls_deinit(*session);

586

614

return -1;

597

625

598

626

do {

599

627

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

600

mc.cred);

628

mc->cred);

601

629

if(quit_now){

602

630

gnutls_deinit(*session);

603

631

return -1;

613

641

/* ignore client certificate if any. */

614

642

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

615

643

616

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

617

645

618

646

return 0;

619

647

}

622

650

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

623

651

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

624

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 = (int)TEMP_FAILURE_RETRY(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

if(helperdir_fd == -1){

779

perror_plus("open");

780

_exit(EX_UNAVAILABLE);

781

}

782

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

783

helper, O_RDONLY));

784

if(helper_fd == -1){

785

perror_plus("openat");

786

_exit(EX_UNAVAILABLE);

787

}

788

TEMP_FAILURE_RETRY(close(helperdir_fd));

789

#ifdef __GNUC__

790

#pragma GCC diagnostic push

791

#pragma GCC diagnostic ignored "-Wcast-qual"

792

#endif

793

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

794

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

795

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

796

#ifdef __GNUC__

797

#pragma GCC diagnostic pop

798

#endif

799

perror_plus("fexecve");

800

_exit(EXIT_FAILURE);

801

}

802

}

803

if(pid == -1){

804

perror_plus("fork");

805

return false;

806

}

807

int status;

808

pid_t pret = -1;

809

errno = 0;

810

do {

811

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

812

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

813

int errno_raising = 0;

814

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

815

errno_raising = errno;

816

perror_plus("Failed to raise privileges in order to"

817

" kill helper program");

818

}

819

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

820

perror_plus("kill");

821

}

822

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

823

perror_plus("Failed to lower privileges after killing"

824

" helper program");

825

}

826

return false;

827

}

828

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

829

if(pret == -1){

830

perror_plus("waitpid");

831

return false;

832

}

833

if(WIFEXITED(status)){

834

if(WEXITSTATUS(status) != 0){

835

fprintf_plus(stderr, "Error: iprouteadddel exited"

836

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

837

return false;

838

}

839

return true;

840

}

841

if(WIFSIGNALED(status)){

842

fprintf_plus(stderr, "Error: iprouteadddel died by"

843

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

844

return false;

845

}

846

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

847

return false;

848

}

849

850

__attribute__((nonnull, warn_unused_result))

851

static bool add_local_route(const char *address,

852

AvahiIfIndex if_index){

853

return add_remove_local_route(true, address, if_index);

854

}

855

856

__attribute__((nonnull, warn_unused_result))

857

static bool remove_local_route(const char *address,

858

AvahiIfIndex if_index){

859

return add_remove_local_route(false, address, if_index);

860

}

861

625

862

/* Called when a Mandos server is found */

626

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

863

__attribute__((nonnull, warn_unused_result))

864

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

627

865

AvahiIfIndex if_index,

628

int af){

866

int af, mandos_context *mc){

629

867

int ret, tcp_sd = -1;

630

868

ssize_t sret;

631

union {

632

struct sockaddr_in in;

633

struct sockaddr_in6 in6;

634

} to;

869

struct sockaddr_storage to;

635

870

char *buffer = NULL;

636

871

char *decrypted_buffer = NULL;

637

872

size_t buffer_length = 0;

640

875

int retval = -1;

641

876

gnutls_session_t session;

642

877

int pf; /* Protocol family */

878

bool route_added = false;

643

879

644

880

errno = 0;

645

881

661

897

return -1;

662

898

}

663

899

664

ret = init_gnutls_session(&session);

900

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

901

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

902

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

903

bool match = false;

904

{

905

char *interface = NULL;

906

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

907

interface))){

908

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

909

match = true;

910

break;

911

}

912

}

913

}

914

if(not match){

915

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

916

connect to the server */

917

if(debug){

918

char interface[IF_NAMESIZE];

919

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

920

perror_plus("if_indextoname");

921

} else {

922

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

923

" \"%s\"\n",

924

if_indextoname((unsigned int)if_index,

925

interface));

926

}

927

}

928

return -1;

929

}

930

}

931

932

ret = init_gnutls_session(&session, mc);

665

933

if(ret != 0){

666

934

return -1;

667

935

}

668

936

669

937

if(debug){

670

938

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

671

PRIu16 "\n", ip, port);

939

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

672

940

}

673

941

674

tcp_sd = socket(pf, SOCK_STREAM, 0);

942

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

675

943

if(tcp_sd < 0){

676

944

int e = errno;

677

945

perror_plus("socket");

686

954

687

955

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

688

956

if(af == AF_INET6){

689

to.in6.sin6_family = (sa_family_t)af;

690

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

957

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

958

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

691

959

} else { /* IPv4 */

692

to.in.sin_family = (sa_family_t)af;

693

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

960

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

961

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

694

962

}

695

963

if(ret < 0 ){

696

964

int e = errno;

705

973

goto mandos_end;

706

974

}

707

975

if(af == AF_INET6){

708

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

709

-Wconversion and

710

-Wunreachable-code */

711

712

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

713

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

714

-Wunreachable-code*/

976

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

977

if(IN6_IS_ADDR_LINKLOCAL

978

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

715

979

if(if_index == AVAHI_IF_UNSPEC){

716

980

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

717

981

" incomplete without a network interface\n");

719

983

goto mandos_end;

720

984

}

721

985

/* Set the network interface number as scope */

722

to.in6.sin6_scope_id = (uint32_t)if_index;

986

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

723

987

}

724

988

} else {

725

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

726

-Wconversion and

727

-Wunreachable-code */

989

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

728

990

}

729

991

730

992

if(quit_now){

738

1000

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

739

1001

perror_plus("if_indextoname");

740

1002

} else {

741

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

742

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

1003

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

1004

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

743

1005

}

744

1006

} else {

745

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

746

ip, port);

1007

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

1008

ip, (uintmax_t)port);

747

1009

}

748

1010

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

749

1011

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

const char *pcret;

751

if(af == AF_INET6){

752

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

753

sizeof(addrstr));

754

} else {

755

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

756

sizeof(addrstr));

757

}

758

if(pcret == NULL){

759

perror_plus("inet_ntop");

760

} else {

761

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

762

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

763

}

764

}

765

}

766

767

if(quit_now){

768

errno = EINTR;

769

goto mandos_end;

770

}

771

772

if(af == AF_INET6){

773

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

774

} else {

775

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

776

}

777

if(ret < 0){

778

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

779

int e = errno;

780

perror_plus("connect");

781

errno = e;

782

}

783

goto mandos_end;

784

}

785

786

if(quit_now){

787

errno = EINTR;

788

goto mandos_end;

1012

if(af == AF_INET6){

1013

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

1014

sizeof(struct sockaddr_in6),

1015

addrstr, sizeof(addrstr), NULL, 0,

1016

NI_NUMERICHOST);

1017

} else {

1018

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

1019

sizeof(struct sockaddr_in),

1020

addrstr, sizeof(addrstr), NULL, 0,

1021

NI_NUMERICHOST);

1022

}

1023

if(ret == EAI_SYSTEM){

1024

perror_plus("getnameinfo");

1025

} else if(ret != 0) {

1026

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

1027

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

1028

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

1029

}

1030

}

1031

1032

if(quit_now){

1033

errno = EINTR;

1034

goto mandos_end;

1035

}

1036

1037

while(true){

1038

if(af == AF_INET6){

1039

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

1040

sizeof(struct sockaddr_in6));

1041

} else {

1042

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

1043

sizeof(struct sockaddr_in));

1044

}

1045

if(ret < 0){

1046

if(errno == ENETUNREACH

1047

and if_index != AVAHI_IF_UNSPEC

1048

and connect_to == NULL

1049

and not route_added and

1050

((af == AF_INET6 and not

1051

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1052

&to)->sin6_addr)))

1053

or (af == AF_INET and

1054

/* Not a a IPv4LL address */

1055

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

1056

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

1057

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

1058

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

1059

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

1060

connect to a Mandos server announced by Avahi on a server

1061

host with a global address. Work around this by retrying

1062

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

1063

1064

Avahi bug reference:

1065

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

1066

https://bugs.debian.org/587961

1067

*/

1068

int e = errno;

1069

route_added = add_local_route(ip, if_index);

1070

if(route_added){

1071

continue;

1072

}

1073

errno = e;

1074

}

1075

if(errno != ECONNREFUSED or debug){

1076

int e = errno;

1077

perror_plus("connect");

1078

errno = e;

1079

}

1080

goto mandos_end;

1081

}

1082

1083

if(quit_now){

1084

errno = EINTR;

1085

goto mandos_end;

1086

}

1087

break;

789

1088

}

790

1089

791

1090

const char *out = mandos_protocol_version;

942

1241

if(buffer_length > 0){

943

1242

ssize_t decrypted_buffer_size;

944

1243

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

945

&decrypted_buffer);

1244

&decrypted_buffer, mc);

946

1245

if(decrypted_buffer_size >= 0){

947

1246

948

1247

written = 0;

974

1273

975

1274

mandos_end:

976

1275

{

1276

if(route_added){

1277

if(not remove_local_route(ip, if_index)){

1278

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

1279

" interface %d", ip, if_index);

1280

}

1281

}

977

1282

int e = errno;

978

1283

free(decrypted_buffer);

979

1284

free(buffer);

996

1301

return retval;

997

1302

}

998

1303

1304

__attribute__((nonnull))

999

1305

static void resolve_callback(AvahiSServiceResolver *r,

1000

1306

AvahiIfIndex interface,

1001

1307

AvahiProtocol proto,

1009

1315

AVAHI_GCC_UNUSED AvahiStringList *txt,

1010

1316

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1011

1317

flags,

1012

AVAHI_GCC_UNUSED void* userdata){

1013

assert(r);

1318

void *mc){

1319

if(r == NULL){

1320

return;

1321

}

1014

1322

1015

1323

/* Called whenever a service has been resolved successfully or

1016

1324

timed out */

1017

1325

1018

1326

if(quit_now){

1327

avahi_s_service_resolver_free(r);

1019

1328

return;

1020

1329

}

1021

1330

1025

1334

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

1026

1335

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

1027

1336

domain,

1028

avahi_strerror(avahi_server_errno(mc.server)));

1337

avahi_strerror(avahi_server_errno

1338

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

1029

1339

break;

1030

1340

1031

1341

case AVAHI_RESOLVER_FOUND:

1037

1347

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

1038

1348

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

1039

1349

}

1040

int ret = start_mandos_communication(ip, port, interface,

1041

avahi_proto_to_af(proto));

1350

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

1351

interface,

1352

avahi_proto_to_af(proto),

1353

mc);

1042

1354

if(ret == 0){

1043

avahi_simple_poll_quit(mc.simple_poll);

1355

avahi_simple_poll_quit(simple_poll);

1044

1356

} else {

1045

if(not add_server(ip, port, interface,

1046

avahi_proto_to_af(proto))){

1357

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

1358

avahi_proto_to_af(proto),

1359

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

1047

1360

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

1048

1361

" list\n", name);

1049

1362

}

1062

1375

const char *domain,

1063

1376

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1064

1377

flags,

1065

AVAHI_GCC_UNUSED void* userdata){

1066

assert(b);

1378

void *mc){

1379

if(b == NULL){

1380

return;

1381

}

1067

1382

1068

1383

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

1069

1384

is removed from the LAN */

1077

1392

case AVAHI_BROWSER_FAILURE:

1078

1393

1079

1394

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1395

avahi_strerror(avahi_server_errno

1396

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

1397

avahi_simple_poll_quit(simple_poll);

1082

1398

return;

1083

1399

1084

1400

case AVAHI_BROWSER_NEW:

1087

1403

the callback function is called the Avahi server will free the

1088

1404

resolver for us. */

1089

1405

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1406

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

1407

interface, protocol, name, type,

1408

domain, protocol, 0,

1409

resolve_callback, mc) == NULL)

1093

1410

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

1094

1411

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1412

avahi_strerror(avahi_server_errno

1413

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

1096

1414

break;

1097

1415

1098

1416

case AVAHI_BROWSER_REMOVE:

1117

1435

signal_received = sig;

1118

1436

int old_errno = errno;

1119

1437

/* set main loop to exit */

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1438

if(simple_poll != NULL){

1439

avahi_simple_poll_quit(simple_poll);

1122

1440

}

1123

1441

errno = old_errno;

1124

1442

}

1125

1443

1444

__attribute__((nonnull, warn_unused_result))

1126

1445

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

1127

1446

int ret;

1128

1447

error_t ret_errno;

1147

1466

return true;

1148

1467

}

1149

1468

1469

__attribute__((nonnull, warn_unused_result))

1150

1470

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

1151

1471

1152

1472

/* Reject the loopback device */

1194

1514

* corresponds to an acceptable network device.

1195

1515

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

1196

1516

*/

1517

__attribute__((nonnull, warn_unused_result))

1197

1518

int good_interface(const struct dirent *if_entry){

1198

1519

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

1199

1520

return 0;

1217

1538

/*

1218

1539

* This function determines if a network interface is up.

1219

1540

*/

1541

__attribute__((nonnull, warn_unused_result))

1220

1542

bool interface_is_up(const char *interface){

1221

1543

struct ifreq ifr;

1222

1544

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

1233

1555

/*

1234

1556

* This function determines if a network interface is running

1235

1557

*/

1558

__attribute__((nonnull, warn_unused_result))

1236

1559

bool interface_is_running(const char *interface){

1237

1560

struct ifreq ifr;

1238

1561

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

1246

1569

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

1247

1570

}

1248

1571

1572

__attribute__((nonnull, pure, warn_unused_result))

1249

1573

int notdotentries(const struct dirent *direntry){

1250

1574

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

1251

1575

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

1258

1582

}

1259

1583

1260

1584

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

1585

__attribute__((nonnull, warn_unused_result))

1261

1586

int runnable_hook(const struct dirent *direntry){

1262

1587

int ret;

1263

1588

size_t sret;

1271

1596

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

1272

1597

"abcdefghijklmnopqrstuvwxyz"

1273

1598

"0123456789"

1274

"_-");

1599

"_.-");

1275

1600

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

1276

1601

/* Contains non-allowed characters */

1277

1602

if(debug){

1281

1606

return 0;

1282

1607

}

1283

1608

1284

char *fullname = NULL;

1285

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

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1609

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

1292

1610

if(ret == -1){

1293

1611

if(debug){

1294

1612

perror_plus("Could not stat hook");

1318

1636

return 1;

1319

1637

}

1320

1638

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1639

__attribute__((nonnull, warn_unused_result))

1640

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1641

mandos_context *mc){

1322

1642

int ret;

1323

1643

struct timespec now;

1324

1644

struct timespec waited_time;

1325

1645

intmax_t block_time;

1326

1646

1327

1647

while(true){

1328

if(mc.current_server == NULL){

1329

if (debug){

1648

if(mc->current_server == NULL){

1649

if(debug){

1330

1650

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

1331

1651

" No timeout!\n");

1332

1652

}

1333

1653

ret = avahi_simple_poll_iterate(s, -1);

1334

1654

} else {

1335

if (debug){

1655

if(debug){

1336

1656

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

1337

1657

" it, or wait\n");

1338

1658

}

1345

1665

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

1346

1666

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

1347

1667

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1668

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

1349

1669

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1670

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

1351

1671

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

1352

1672

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

1353

1673

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

1355

1675

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

1356

1676

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

1357

1677

1358

if (debug){

1678

if(debug){

1359

1679

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

1360

1680

block_time);

1361

1681

}

1362

1682

1363

1683

if(block_time <= 0){

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1684

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

1685

mc->current_server->port,

1686

mc->current_server->if_index,

1687

mc->current_server->af, mc);

1368

1688

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1689

avahi_simple_poll_quit(s);

1370

1690

return 0;

1371

1691

}

1372

1692

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1693

&mc->current_server->last_seen);

1374

1694

if(ret == -1){

1375

1695

perror_plus("clock_gettime");

1376

1696

return -1;

1377

1697

}

1378

mc.current_server = mc.current_server->next;

1698

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

1379

1699

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

1380

1700

servers, but don't block */

1381

1701

}

1383

1703

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

1384

1704

}

1385

1705

if(ret != 0){

1386

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

1706

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

1387

1707

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

1388

1708

}

1389

1709

}

1390

1710

}

1391

1711

}

1392

1712

1393

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

1394

error_t raise_privileges(void){

1395

error_t old_errno = errno;

1396

error_t ret_errno = 0;

1397

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

1398

ret_errno = errno;

1399

perror_plus("seteuid");

1400

}

1401

errno = old_errno;

1402

return ret_errno;

1403

}

1404

1405

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

1406

error_t raise_privileges_permanently(void){

1407

error_t old_errno = errno;

1408

error_t ret_errno = raise_privileges();

1409

if(ret_errno != 0){

1410

errno = old_errno;

1411

return ret_errno;

1412

}

1413

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

1414

ret_errno = errno;

1415

perror_plus("seteuid");

1416

}

1417

errno = old_errno;

1418

return ret_errno;

1419

}

1420

1421

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

1422

error_t lower_privileges(void){

1423

error_t old_errno = errno;

1424

error_t ret_errno = 0;

1425

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

1426

ret_errno = errno;

1427

perror_plus("seteuid");

1428

}

1429

errno = old_errno;

1430

return ret_errno;

1431

}

1432

1433

/* Lower privileges permanently */

1434

error_t lower_privileges_permanently(void){

1435

error_t old_errno = errno;

1436

error_t ret_errno = 0;

1437

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

1438

ret_errno = errno;

1439

perror_plus("setuid");

1440

}

1441

errno = old_errno;

1442

return ret_errno;

1443

}

1444

1445

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

1713

__attribute__((nonnull))

1714

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

1446

1715

const float delay){

1447

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

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

1451

alphasort);

1716

struct dirent **direntries = NULL;

1717

if(hookdir_fd == -1){

1718

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1719

| O_CLOEXEC);

1720

if(hookdir_fd == -1){

1721

if(errno == ENOENT){

1722

if(debug){

1723

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

1724

" found\n", hookdir);

1725

}

1726

} else {

1727

perror_plus("open");

1728

}

1729

return;

1730

}

1731

}

1732

#ifdef __GLIBC__

1733

#if __GLIBC_PREREQ(2, 15)

1734

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

1735

runnable_hook, alphasort);

1736

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

1737

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

1738

alphasort);

1739

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

1740

#else /* not __GLIBC__ */

1741

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

1742

alphasort);

1743

#endif /* not __GLIBC__ */

1452

1744

if(numhooks == -1){

1453

1745

perror_plus("scandir");

1454

} else {

1455

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

1456

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

1457

direntry = direntries[i];

1458

char *fullname = NULL;

1459

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

1460

if(ret < 0){

1746

return;

1747

}

1748

struct dirent *direntry;

1749

int ret;

1750

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

1751

if(devnull == -1){

1752

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

1753

return;

1754

}

1755

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

1756

direntry = direntries[i];

1757

if(debug){

1758

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

1759

direntry->d_name);

1760

}

1761

pid_t hook_pid = fork();

1762

if(hook_pid == 0){

1763

/* Child */

1764

/* Raise privileges */

1765

errno = raise_privileges_permanently();

1766

if(errno != 0){

1767

perror_plus("Failed to raise privileges");

1768

_exit(EX_NOPERM);

1769

}

1770

/* Set group */

1771

errno = 0;

1772

ret = setgid(0);

1773

if(ret == -1){

1774

perror_plus("setgid");

1775

_exit(EX_NOPERM);

1776

}

1777

/* Reset supplementary groups */

1778

errno = 0;

1779

ret = setgroups(0, NULL);

1780

if(ret == -1){

1781

perror_plus("setgroups");

1782

_exit(EX_NOPERM);

1783

}

1784

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

1785

if(ret == -1){

1786

perror_plus("setenv");

1787

_exit(EX_OSERR);

1788

}

1789

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

1790

if(ret == -1){

1791

perror_plus("setenv");

1792

_exit(EX_OSERR);

1793

}

1794

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

1795

if(ret == -1){

1796

perror_plus("setenv");

1797

_exit(EX_OSERR);

1798

}

1799

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

1800

if(ret == -1){

1801

perror_plus("setenv");

1802

_exit(EX_OSERR);

1803

}

1804

char *delaystring;

1805

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

1806

if(ret == -1){

1461

1807

perror_plus("asprintf");

1462

continue;

1463

}

1464

if(debug){

1465

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

1466

direntry->d_name);

1467

}

1468

pid_t hook_pid = fork();

1469

if(hook_pid == 0){

1470

/* Child */

1471

/* Raise privileges */

1472

raise_privileges_permanently();

1473

/* Set group */

1474

errno = 0;

1475

ret = setgid(0);

1476

if(ret == -1){

1477

perror_plus("setgid");

1478

}

1479

/* Reset supplementary groups */

1480

errno = 0;

1481

ret = setgroups(0, NULL);

1482

if(ret == -1){

1483

perror_plus("setgroups");

1484

}

1485

dup2(devnull, STDIN_FILENO);

1486

close(devnull);

1487

dup2(STDERR_FILENO, STDOUT_FILENO);

1488

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

1489

if(ret == -1){

1490

perror_plus("setenv");

1491

_exit(EX_OSERR);

1492

}

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

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

1499

if(ret == -1){

1500

perror_plus("setenv");

1501

_exit(EX_OSERR);

1502

}

1503

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

1504

if(ret == -1){

1505

perror_plus("setenv");

1506

_exit(EX_OSERR);

1507

}

1508

char *delaystring;

1509

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

1510

if(ret == -1){

1511

perror_plus("asprintf");

1512

_exit(EX_OSERR);

1513

}

1514

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

1515

if(ret == -1){

1516

free(delaystring);

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1808

_exit(EX_OSERR);

1809

}

1810

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

1811

if(ret == -1){

1520

1812

free(delaystring);

1521

if(connect_to != NULL){

1522

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

1523

if(ret == -1){

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

1527

}

1528

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

1529

perror_plus("execl");

1530

_exit(EXIT_FAILURE);

1531

}

1813

perror_plus("setenv");

1814

_exit(EX_OSERR);

1815

}

1816

free(delaystring);

1817

if(connect_to != NULL){

1818

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

1819

if(ret == -1){

1820

perror_plus("setenv");

1821

_exit(EX_OSERR);

1822

}

1823

}

1824

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

1825

direntry->d_name,

1826

O_RDONLY));

1827

if(hook_fd == -1){

1828

perror_plus("openat");

1829

_exit(EXIT_FAILURE);

1830

}

1831

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

1832

perror_plus("close");

1833

_exit(EXIT_FAILURE);

1834

}

1835

ret = dup2(devnull, STDIN_FILENO);

1836

if(ret == -1){

1837

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

1838

_exit(EX_OSERR);

1839

}

1840

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

1841

if(ret == -1){

1842

perror_plus("close");

1843

_exit(EX_OSERR);

1844

}

1845

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1846

if(ret == -1){

1847

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

1848

_exit(EX_OSERR);

1849

}

1850

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

1851

environ) == -1){

1852

perror_plus("fexecve");

1853

_exit(EXIT_FAILURE);

1854

}

1855

} else {

1856

if(hook_pid == -1){

1857

perror_plus("fork");

1858

free(direntry);

1859

continue;

1860

}

1861

int status;

1862

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

1863

perror_plus("waitpid");

1864

free(direntry);

1865

continue;

1866

}

1867

if(WIFEXITED(status)){

1868

if(WEXITSTATUS(status) != 0){

1869

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

1870

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

1871

WEXITSTATUS(status));

1872

free(direntry);

1873

continue;

1874

}

1875

} else if(WIFSIGNALED(status)){

1876

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

1877

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

1878

WTERMSIG(status));

1879

free(direntry);

1880

continue;

1532

1881

} else {

1533

int status;

1534

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

1535

perror_plus("waitpid");

1536

free(fullname);

1537

continue;

1538

}

1539

if(WIFEXITED(status)){

1540

if(WEXITSTATUS(status) != 0){

1541

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

1542

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

1543

WEXITSTATUS(status));

1544

free(fullname);

1545

continue;

1546

}

1547

} else if(WIFSIGNALED(status)){

1548

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

1549

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

1550

WTERMSIG(status));

1551

free(fullname);

1552

continue;

1553

} else {

1554

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

1555

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

1556

free(fullname);

1557

continue;

1558

}

1559

}

1560

free(fullname);

1561

if(debug){

1562

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

1563

direntry->d_name);

1564

}

1565

}

1566

close(devnull);

1567

}

1568

return true;

1882

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

1883

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

1884

free(direntry);

1885

continue;

1886

}

1887

}

1888

if(debug){

1889

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

1890

direntry->d_name);

1891

}

1892

free(direntry);

1893

}

1894

free(direntries);

1895

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

1896

perror_plus("close");

1897

} else {

1898

hookdir_fd = -1;

1899

}

1900

close(devnull);

1569

1901

}

1570

1902

1903

__attribute__((nonnull, warn_unused_result))

1571

1904

error_t bring_up_interface(const char *const interface,

1572

1905

const float delay){

1573

int sd = -1;

1574

1906

error_t old_errno = errno;

1575

error_t ret_errno = 0;

1576

int ret, ret_setflags;

1907

int ret;

1577

1908

struct ifreq network;

1578

1909

unsigned int if_index = if_nametoindex(interface);

1579

1910

if(if_index == 0){

1588

1919

}

1589

1920

1590

1921

if(not interface_is_up(interface)){

1591

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

1922

error_t ret_errno = 0, ioctl_errno = 0;

1923

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

1592

1924

ret_errno = errno;

1593

1925

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

1594

1926

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

1927

errno = old_errno;

1595

1928

return ret_errno;

1596

1929

}

1597

network.ifr_flags |= IFF_UP;

1930

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

1598

1931

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

1932

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

1933

if(sd == -1){

1601

1934

ret_errno = errno;

1602

1935

perror_plus("socket");

1603

1936

errno = old_errno;

1604

1937

return ret_errno;

1605

1938

}

1606

1939

1607

1940

if(quit_now){

1608

close(sd);

1941

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

1942

if(ret == -1){

1943

perror_plus("close");

1944

}

1609

1945

errno = old_errno;

1610

1946

return EINTR;

1611

1947

}

1615

1951

interface);

1616

1952

}

1617

1953

1618

/* Raise priviliges */

1619

raise_privileges();

1954

/* Raise privileges */

1955

ret_errno = raise_privileges();

1956

if(ret_errno != 0){

1957

errno = ret_errno;

1958

perror_plus("Failed to raise privileges");

1959

}

1620

1960

1621

1961

#ifdef __linux__

1622

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1623

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

1624

int ret_linux = klogctl(8, NULL, 5);

1625

bool restore_loglevel = true;

1626

if(ret_linux == -1){

1627

restore_loglevel = false;

1628

perror_plus("klogctl");

1962

int ret_linux;

1963

bool restore_loglevel = false;

1964

if(ret_errno == 0){

1965

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1966

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

1967

ret_linux = klogctl(8, NULL, 5);

1968

if(ret_linux == -1){

1969

perror_plus("klogctl");

1970

} else {

1971

restore_loglevel = true;

1972

}

1629

1973

}

1630

1974

#endif /* __linux__ */

1631

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

1632

ret_errno = errno;

1975

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

1976

ioctl_errno = errno;

1633

1977

#ifdef __linux__

1634

1978

if(restore_loglevel){

1635

1979

ret_linux = klogctl(7, NULL, 0);

1639

1983

}

1640

1984

#endif /* __linux__ */

1641

1985

1642

/* Lower privileges */

1643

lower_privileges();

1986

/* If raise_privileges() succeeded above */

1987

if(ret_errno == 0){

1988

/* Lower privileges */

1989

ret_errno = lower_privileges();

1990

if(ret_errno != 0){

1991

errno = ret_errno;

1992

perror_plus("Failed to lower privileges");

1993

}

1994

}

1644

1995

1645

1996

/* Close the socket */

1646

1997

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

1649

2000

}

1650

2001

1651

2002

if(ret_setflags == -1){

1652

errno = ret_errno;

2003

errno = ioctl_errno;

1653

2004

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1654

2005

errno = old_errno;

1655

return ret_errno;

2006

return ioctl_errno;

1656

2007

}

1657

2008

} else if(debug){

1658

2009

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

1676

2027

return 0;

1677

2028

}

1678

2029

2030

__attribute__((nonnull, warn_unused_result))

1679

2031

error_t take_down_interface(const char *const interface){

1680

int sd = -1;

1681

2032

error_t old_errno = errno;

1682

error_t ret_errno = 0;

1683

int ret, ret_setflags;

1684

2033

struct ifreq network;

1685

2034

unsigned int if_index = if_nametoindex(interface);

1686

2035

if(if_index == 0){

1689

2038

return ENXIO;

1690

2039

}

1691

2040

if(interface_is_up(interface)){

2041

error_t ret_errno = 0, ioctl_errno = 0;

1692

2042

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

1693

2043

ret_errno = errno;

1694

2044

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

1695

2045

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

2046

errno = old_errno;

1696

2047

return ret_errno;

1697

2048

}

1698

2049

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

1699

2050

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

2051

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

2052

if(sd == -1){

1702

2053

ret_errno = errno;

1703

2054

perror_plus("socket");

1704

2055

errno = old_errno;

1710

2061

interface);

1711

2062

}

1712

2063

1713

/* Raise priviliges */

1714

raise_privileges();

1715

1716

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

1717

ret_errno = errno;

1718

1719

/* Lower privileges */

1720

lower_privileges();

2064

/* Raise privileges */

2065

ret_errno = raise_privileges();

2066

if(ret_errno != 0){

2067

errno = ret_errno;

2068

perror_plus("Failed to raise privileges");

2069

}

2070

2071

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

2072

ioctl_errno = errno;

2073

2074

/* If raise_privileges() succeeded above */

2075

if(ret_errno == 0){

2076

/* Lower privileges */

2077

ret_errno = lower_privileges();

2078

if(ret_errno != 0){

2079

errno = ret_errno;

2080

perror_plus("Failed to lower privileges");

2081

}

2082

}

1721

2083

1722

2084

/* Close the socket */

1723

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

2085

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

1724

2086

if(ret == -1){

1725

2087

perror_plus("close");

1726

2088

}

1727

2089

1728

2090

if(ret_setflags == -1){

1729

errno = ret_errno;

2091

errno = ioctl_errno;

1730

2092

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1731

2093

errno = old_errno;

1732

return ret_errno;

2094

return ioctl_errno;

1733

2095

}

1734

2096

} else if(debug){

1735

2097

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

1741

2103

}

1742

2104

1743

2105

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

2106

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

2107

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

2108

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

2109

.interfaces = NULL, .interfaces_size = 0 };

1744

2110

AvahiSServiceBrowser *sb = NULL;

1745

2111

error_t ret_errno;

1746

2112

int ret;

1747

2113

intmax_t tmpmax;

1748

2114

char *tmp;

1749

2115

int exitcode = EXIT_SUCCESS;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

1752

2116

char *interfaces_to_take_down = NULL;

1753

2117

size_t interfaces_to_take_down_size = 0;

1754

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

1755

bool tempdir_created = false;

2118

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

2119

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

2120

char *tempdir = NULL;

1756

2121

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1757

2122

const char *seckey = PATHDIR "/" SECKEY;

1758

2123

const char *pubkey = PATHDIR "/" PUBKEY;

1759

2124

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

1761

2125

1762

2126

bool gnutls_initialized = false;

1763

2127

bool gpgme_initialized = false;

1854

2218

connect_to = arg;

1855

2219

break;

1856

2220

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

1857

ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,

1858

(int)',');

2221

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

2222

arg, (int)',');

1859

2223

if(ret_errno != 0){

1860

2224

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

1861

2225

}

1936

2300

goto end;

1937

2301

}

1938

2302

}

1939

2303

1940

2304

{

1941

2305

/* Work around Debian bug #633582:

1942

2306

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

1943

2307

1944

/* Re-raise priviliges */

1945

if(raise_privileges() == 0){

2308

/* Re-raise privileges */

2309

ret_errno = raise_privileges();

2310

if(ret_errno != 0){

2311

errno = ret_errno;

2312

perror_plus("Failed to raise privileges");

2313

} else {

1946

2314

struct stat st;

1947

2315

1948

2316

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

1965

2333

TEMP_FAILURE_RETRY(close(seckey_fd));

1966

2334

}

1967

2335

}

1968

2336

1969

2337

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

1970

2338

int pubkey_fd = open(pubkey, O_RDONLY);

1971

2339

if(pubkey_fd == -1){

1986

2354

TEMP_FAILURE_RETRY(close(pubkey_fd));

1987

2355

}

1988

2356

}

1989

2357

1990

2358

/* Lower privileges */

1991

errno = 0;

1992

ret = seteuid(uid);

1993

if(ret == -1){

1994

perror_plus("seteuid");

2359

ret_errno = lower_privileges();

2360

if(ret_errno != 0){

2361

errno = ret_errno;

2362

perror_plus("Failed to lower privileges");

1995

2363

}

1996

2364

}

1997

2365

}

1998

2366

1999

/* Remove empty interface names */

2367

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

2000

2368

{

2001

2369

char *interface = NULL;

2002

while((interface = argz_next(interfaces, interfaces_size,

2370

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

2003

2371

interface))){

2004

if(if_nametoindex(interface) == 0){

2005

if(interface[0] != '\0' and strcmp(interface, "none") != 0){

2372

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

2373

and if_nametoindex(interface) == 0){

2374

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

2006

2375

fprintf_plus(stderr, "Not using nonexisting interface"

2007

2376

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

2008

2377

}

2009

argz_delete(&interfaces, &interfaces_size, interface);

2378

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

2010

2379

interface = NULL;

2011

2380

}

2012

2381

}

2014

2383

2015

2384

/* Run network hooks */

2016

2385

{

2017

ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,

2018

interfaces, interfaces_size);

2019

if(ret_errno != 0){

2020

errno = ret_errno;

2021

perror_plus("argz_append");

2022

goto end;

2023

}

2024

argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');

2025

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

2026

goto end;

2027

}

2386

if(mc.interfaces != NULL){

2387

interfaces_hooks = malloc(mc.interfaces_size);

2388

if(interfaces_hooks == NULL){

2389

perror_plus("malloc");

2390

goto end;

2391

}

2392

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

2393

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

2394

}

2395

run_network_hooks("start", interfaces_hooks != NULL ?

2396

interfaces_hooks : "", delay);

2028

2397

}

2029

2398

2030

2399

if(not debug){

2035

2404

from the signal handler */

2036

2405

/* Initialize the pseudo-RNG for Avahi */

2037

2406

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

2038

mc.simple_poll = avahi_simple_poll_new();

2039

if(mc.simple_poll == NULL){

2407

simple_poll = avahi_simple_poll_new();

2408

if(simple_poll == NULL){

2040

2409

fprintf_plus(stderr,

2041

2410

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

2042

2411

exitcode = EX_UNAVAILABLE;

2107

2476

}

2108

2477

2109

2478

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

2110

if(interfaces == NULL){

2111

struct dirent **direntries;

2479

if(mc.interfaces == NULL){

2480

struct dirent **direntries = NULL;

2112

2481

/* Look for any good interfaces */

2113

2482

ret = scandir(sys_class_net, &direntries, good_interface,

2114

2483

alphasort);

2115

2484

if(ret >= 1){

2116

2485

/* Add all found interfaces to interfaces list */

2117

2486

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

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2487

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

2119

2488

direntries[i]->d_name);

2120

2489

if(ret_errno != 0){

2490

errno = ret_errno;

2121

2491

perror_plus("argz_add");

2492

free(direntries[i]);

2122

2493

continue;

2123

2494

}

2124

2495

if(debug){

2125

2496

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

2126

2497

direntries[i]->d_name);

2127

2498

}

2499

free(direntries[i]);

2128

2500

}

2129

2501

free(direntries);

2130

2502

} else {

2131

free(direntries);

2503

if(ret == 0){

2504

free(direntries);

2505

}

2132

2506

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

2133

2507

exitcode = EXIT_FAILURE;

2134

2508

goto end;

2135

2509

}

2136

2510

}

2137

2511

2138

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

2139

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

2140

if(debug){

2141

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

2142

interfaces);

2143

}

2144

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2145

}

2146

2147

/* Bring up interfaces which are down */

2148

if(not (argz_count(interfaces, interfaces_size) == 1

2149

and strcmp(interfaces, "none") == 0)){

2512

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

2513

{

2150

2514

char *interface = NULL;

2151

while((interface = argz_next(interfaces, interfaces_size,

2515

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

2152

2516

interface))){

2517

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

2518

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

2519

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

2520

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

2521

interface);

2522

interface = NULL;

2523

while((interface = argz_next(mc.interfaces,

2524

mc.interfaces_size, interface))){

2525

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

2526

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

2527

interface);

2528

interface = NULL;

2529

}

2530

}

2531

break;

2532

}

2153

2533

bool interface_was_up = interface_is_up(interface);

2154

ret = bring_up_interface(interface, delay);

2534

errno = bring_up_interface(interface, delay);

2155

2535

if(not interface_was_up){

2156

if(ret != 0){

2157

errno = ret;

2536

if(errno != 0){

2158

2537

perror_plus("Failed to bring up interface");

2159

2538

} else {

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2539

errno = argz_add(&interfaces_to_take_down,

2540

&interfaces_to_take_down_size,

2541

interface);

2542

if(errno != 0){

2543

perror_plus("argz_add");

2544

}

2163

2545

}

2164

2546

}

2165

2547

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2169

2548

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

2170

2549

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

2171

2550

}

2172

2551

}

2173

2552

2553

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

2554

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

2555

if(debug){

2556

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

2557

mc.interfaces);

2558

}

2559

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

2560

}

2561

2174

2562

if(quit_now){

2175

2563

goto end;

2176

2564

}

2177

2565

2178

ret = init_gnutls_global(pubkey, seckey);

2566

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

2179

2567

if(ret == -1){

2180

2568

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

2181

2569

exitcode = EX_UNAVAILABLE;

2188

2576

goto end;

2189

2577

}

2190

2578

2191

if(mkdtemp(tempdir) == NULL){

2579

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

2580

tempdir = mkdtemp(run_tempdir);

2581

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

2582

if(debug){

2583

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

2584

run_tempdir, old_tempdir);

2585

}

2586

tempdir = mkdtemp(old_tempdir);

2587

}

2588

if(tempdir == NULL){

2192

2589

perror_plus("mkdtemp");

2193

2590

goto end;

2194

2591

}

2195

tempdir_created = true;

2196

2592

2197

2593

if(quit_now){

2198

2594

goto end;

2199

2595

}

2200

2596

2201

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

2597

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

2202

2598

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

2203

2599

exitcode = EX_UNAVAILABLE;

2204

2600

goto end;

2225

2621

goto end;

2226

2622

}

2227

2623

2228

uint16_t port;

2624

in_port_t port;

2229

2625

errno = 0;

2230

2626

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

2231

2627

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

2232

or tmpmax != (uint16_t)tmpmax){

2628

or tmpmax != (in_port_t)tmpmax){

2233

2629

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

2234

2630

exitcode = EX_USAGE;

2235

2631

goto end;

2236

2632

}

2237

2633

2238

2634

if(quit_now){

2239

2635

goto end;

2240

2636

}

2241

2637

2242

port = (uint16_t)tmpmax;

2638

port = (in_port_t)tmpmax;

2243

2639

*address = '\0';

2244

2640

/* Colon in address indicates IPv6 */

2245

2641

int af;

2261

2657

}

2262

2658

2263

2659

while(not quit_now){

2264

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

2660

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

2661

&mc);

2265

2662

if(quit_now or ret == 0){

2266

2663

break;

2267

2664

}

2269

2666

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

2270

2667

(int)retry_interval);

2271

2668

}

2272

sleep((int)retry_interval);

2669

sleep((unsigned int)retry_interval);

2273

2670

}

2274

2671

2275

if (not quit_now){

2672

if(not quit_now){

2276

2673

exitcode = EXIT_SUCCESS;

2277

2674

}

2278

2675

2293

2690

config.publish_domain = 0;

2294

2691

2295

2692

/* Allocate a new server */

2296

mc.server = avahi_server_new(avahi_simple_poll_get

2297

(mc.simple_poll), &config, NULL,

2298

NULL, &ret_errno);

2693

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2694

&config, NULL, NULL, &ret_errno);

2299

2695

2300

2696

/* Free the Avahi configuration data */

2301

2697

avahi_server_config_free(&config);

2316

2712

/* Create the Avahi service browser */

2317

2713

sb = avahi_s_service_browser_new(mc.server, if_index,

2318

2714

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2319

NULL, 0, browse_callback, NULL);

2715

NULL, 0, browse_callback,

2716

(void *)&mc);

2320

2717

if(sb == NULL){

2321

2718

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

2322

2719

avahi_strerror(avahi_server_errno(mc.server)));

2333

2730

if(debug){

2334

2731

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

2335

2732

}

2336

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

2338

(int)(retry_interval * 1000));

2733

2734

ret = avahi_loop_with_timeout(simple_poll,

2735

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

2339

2736

if(debug){

2340

2737

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

2341

2738

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

2348

2745

}

2349

2746

2350

2747

/* Cleanup things */

2748

free(mc.interfaces);

2749

2351

2750

if(sb != NULL)

2352

2751

avahi_s_service_browser_free(sb);

2353

2752

2354

2753

if(mc.server != NULL)

2355

2754

avahi_server_free(mc.server);

2356

2755

2357

if(mc.simple_poll != NULL)

2358

avahi_simple_poll_free(mc.simple_poll);

2756

if(simple_poll != NULL)

2757

avahi_simple_poll_free(simple_poll);

2359

2758

2360

2759

if(gnutls_initialized){

2361

2760

gnutls_certificate_free_credentials(mc.cred);

2373

2772

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

2374

2773

while(mc.current_server != NULL){

2375

2774

server *next = mc.current_server->next;

2775

#ifdef __GNUC__

2776

#pragma GCC diagnostic push

2777

#pragma GCC diagnostic ignored "-Wcast-qual"

2778

#endif

2779

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

2780

#ifdef __GNUC__

2781

#pragma GCC diagnostic pop

2782

#endif

2376

2783

free(mc.current_server);

2377

2784

mc.current_server = next;

2378

2785

}

2379

2786

}

2380

2787

2381

/* Re-raise priviliges */

2788

/* Re-raise privileges */

2382

2789

{

2383

raise_privileges();

2384

2385

/* Run network hooks */

2386

run_network_hooks("stop", interfaces_hooks, delay);

2387

2388

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

2389

{

2390

char *interface = NULL;

2391

while((interface=argz_next(interfaces_to_take_down,

2392

interfaces_to_take_down_size,

2393

interface))){

2394

ret_errno = take_down_interface(interface);

2395

if(ret_errno != 0){

2396

errno = ret_errno;

2397

perror_plus("Failed to take down interface");

2398

}

2399

}

2400

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

2401

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

2402

" down\n");

2403

}

2404

}

2405

2406

lower_privileges_permanently();

2790

ret_errno = raise_privileges();

2791

if(ret_errno != 0){

2792

errno = ret_errno;

2793

perror_plus("Failed to raise privileges");

2794

} else {

2795

2796

/* Run network hooks */

2797

run_network_hooks("stop", interfaces_hooks != NULL ?

2798

interfaces_hooks : "", delay);

2799

2800

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

2801

{

2802

char *interface = NULL;

2803

while((interface=argz_next(interfaces_to_take_down,

2804

interfaces_to_take_down_size,

2805

interface))){

2806

ret_errno = take_down_interface(interface);

2807

if(ret_errno != 0){

2808

errno = ret_errno;

2809

perror_plus("Failed to take down interface");

2810

}

2811

}

2812

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

2813

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

2814

" down\n");

2815

}

2816

}

2817

}

2818

2819

ret_errno = lower_privileges_permanently();

2820

if(ret_errno != 0){

2821

errno = ret_errno;

2822

perror_plus("Failed to lower privileges permanently");

2823

}

2407

2824

}

2408

2825

2409

2826

free(interfaces_to_take_down);

2410

2827

free(interfaces_hooks);

2411

2828

2412

2829

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

2413

if(tempdir_created){

2830

if(tempdir != NULL){

2414

2831

struct dirent **direntries = NULL;

2415

struct dirent *direntry = NULL;

2416

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

2417

alphasort);

2418

if (numentries > 0){

2419

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

2420

direntry = direntries[i];

2421

char *fullname = NULL;

2422

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

2423

direntry->d_name);

2424

if(ret < 0){

2425

perror_plus("asprintf");

2426

continue;

2427

}

2428

ret = remove(fullname);

2429

if(ret == -1){

2430

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

2431

strerror(errno));

2432

}

2433

free(fullname);

2832

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

2833

| O_NOFOLLOW

2834

| O_DIRECTORY

2835

| O_PATH));

2836

if(tempdir_fd == -1){

2837

perror_plus("open");

2838

} else {

2839

#ifdef __GLIBC__

2840

#if __GLIBC_PREREQ(2, 15)

2841

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

2842

notdotentries, alphasort);

2843

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

2844

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

2845

alphasort);

2846

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

2847

#else /* not __GLIBC__ */

2848

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

2849

alphasort);

2850

#endif /* not __GLIBC__ */

2851

if(numentries >= 0){

2852

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

2853

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

2854

if(ret == -1){

2855

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

2856

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

2857

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

2858

}

2859

free(direntries[i]);

2860

}

2861

2862

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

2863

free(direntries);

2864

if(numentries == -1){

2865

perror_plus("scandir");

2866

}

2867

ret = rmdir(tempdir);

2868

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

2869

perror_plus("rmdir");

2870

}

2434

2871

}

2435

}

2436

2437

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

2438

free(direntries);

2439

if (numentries == -1){

2440

perror_plus("scandir");

2441

}

2442

ret = rmdir(tempdir);

2443

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

2444

perror_plus("rmdir");

2872

TEMP_FAILURE_RETRY(close(tempdir_fd));

2445

2873

}

2446

2874

}

2447

2875