/mandos/trunk : revision 705

9

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

10

*

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* Everything else is

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13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

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

41

42

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

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(),

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

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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(),

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argz_delete(), argz_append(),

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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;

177

185

perror(print_text);

178

186

}

179

187

180

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

188

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

181

189

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

182

190

va_list ap;

183

191

va_start (ap, format);

184

192

185

193

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

186

194

program_invocation_short_name));

187

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

195

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

188

196

}

189

197

190

198

/*

192

200

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

193

201

* "buffer_length" is how much is already used.

194

202

*/

203

__attribute__((nonnull, warn_unused_result))

195

204

size_t incbuffer(char **buffer, size_t buffer_length,

196

205

size_t buffer_capacity){

197

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

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

199

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;

200

213

return 0;

201

214

}

215

*buffer = new_buf;

202

216

buffer_capacity += BUFFER_SIZE;

203

217

}

204

218

return buffer_capacity;

205

219

}

206

220

207

221

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

208

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

209

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){

210

225

int ret;

211

226

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

212

227

if(new_server == NULL){

221

236

perror_plus("strdup");

222

237

return false;

223

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

224

244

/* Special case of first server */

225

if (mc.current_server == NULL){

245

if(*current_server == NULL){

226

246

new_server->next = new_server;

227

247

new_server->prev = new_server;

228

mc.current_server = new_server;

229

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

248

*current_server = new_server;

230

249

} else {

231

new_server->next = mc.current_server;

232

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

250

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

251

new_server->next = *current_server;

252

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

233

253

new_server->prev->next = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

254

(*current_server)->prev = new_server;

240

255

}

241

256

return true;

242

257

}

244

259

/*

245

260

* Initialize GPGME.

246

261

*/

247

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

248

const char *tempdir){

262

__attribute__((nonnull, warn_unused_result))

263

static bool init_gpgme(const char * const seckey,

264

const char * const pubkey,

265

const char * const tempdir,

266

mandos_context *mc){

249

267

gpgme_error_t rc;

250

268

gpgme_engine_info_t engine_info;

251

269

252

253

270

/*

254

271

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

255

272

*/

256

bool import_key(const char *filename){

273

bool import_key(const char * const filename){

257

274

int ret;

258

275

int fd;

259

276

gpgme_data_t pgp_data;

271

288

return false;

272

289

}

273

290

274

rc = gpgme_op_import(mc.ctx, pgp_data);

291

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

275

292

if(rc != GPG_ERR_NO_ERROR){

276

293

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

277

294

gpgme_strsource(rc), gpgme_strerror(rc));

321

338

}

322

339

323

340

/* Create new GPGME "context" */

324

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

341

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

325

342

if(rc != GPG_ERR_NO_ERROR){

326

343

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

327

344

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

340

357

* Decrypt OpenPGP data.

341

358

* Returns -1 on error

342

359

*/

360

__attribute__((nonnull, warn_unused_result))

343

361

static ssize_t pgp_packet_decrypt(const char *cryptotext,

344

362

size_t crypto_size,

345

char **plaintext){

363

char **plaintext,

364

mandos_context *mc){

346

365

gpgme_data_t dh_crypto, dh_plain;

347

366

gpgme_error_t rc;

348

367

ssize_t ret;

374

393

375

394

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

376

395

data buffer */

377

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

396

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

378

397

if(rc != GPG_ERR_NO_ERROR){

379

398

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

380

399

gpgme_strsource(rc), gpgme_strerror(rc));

381

400

plaintext_length = -1;

382

401

if(debug){

383

402

gpgme_decrypt_result_t result;

384

result = gpgme_op_decrypt_result(mc.ctx);

403

result = gpgme_op_decrypt_result(mc->ctx);

385

404

if(result == NULL){

386

405

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

387

406

} else {

464

483

return plaintext_length;

465

484

}

466

485

467

static const char * safer_gnutls_strerror(int value){

468

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

469

-Wunreachable-code */

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

const char *ret = gnutls_strerror(value);

470

489

if(ret == NULL)

471

490

ret = "(unknown)";

472

491

return ret;

473

492

}

474

493

475

494

/* GnuTLS log function callback */

495

__attribute__((nonnull))

476

496

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

477

497

const char* string){

478

498

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

479

499

}

480

500

501

__attribute__((nonnull, warn_unused_result))

481

502

static int init_gnutls_global(const char *pubkeyfilename,

482

const char *seckeyfilename){

503

const char *seckeyfilename,

504

mandos_context *mc){

483

505

int ret;

484

506

485

507

if(debug){

502

524

}

503

525

504

526

/* OpenPGP credentials */

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

506

528

if(ret != GNUTLS_E_SUCCESS){

507

529

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

508

530

safer_gnutls_strerror(ret));

518

540

}

519

541

520

542

ret = gnutls_certificate_set_openpgp_key_file

521

(mc.cred, pubkeyfilename, seckeyfilename,

543

(mc->cred, pubkeyfilename, seckeyfilename,

522

544

GNUTLS_OPENPGP_FMT_BASE64);

523

545

if(ret != GNUTLS_E_SUCCESS){

524

546

fprintf_plus(stderr,

530

552

}

531

553

532

554

/* GnuTLS server initialization */

533

ret = gnutls_dh_params_init(&mc.dh_params);

555

ret = gnutls_dh_params_init(&mc->dh_params);

534

556

if(ret != GNUTLS_E_SUCCESS){

535

557

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

558

" initialization: %s\n",

537

559

safer_gnutls_strerror(ret));

538

560

goto globalfail;

539

561

}

540

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

562

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

541

563

if(ret != GNUTLS_E_SUCCESS){

542

564

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

543

565

safer_gnutls_strerror(ret));

544

566

goto globalfail;

545

567

}

546

568

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

569

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

548

570

549

571

return 0;

550

572

551

573

globalfail:

552

574

553

gnutls_certificate_free_credentials(mc.cred);

575

gnutls_certificate_free_credentials(mc->cred);

554

576

gnutls_global_deinit();

555

gnutls_dh_params_deinit(mc.dh_params);

577

gnutls_dh_params_deinit(mc->dh_params);

556

578

return -1;

557

579

}

558

580

559

static int init_gnutls_session(gnutls_session_t *session){

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

560

584

int ret;

561

585

/* GnuTLS session creation */

562

586

do {

574

598

{

575

599

const char *err;

576

600

do {

577

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

601

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

578

602

if(quit_now){

579

603

gnutls_deinit(*session);

580

604

return -1;

591

615

592

616

do {

593

617

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

594

mc.cred);

618

mc->cred);

595

619

if(quit_now){

596

620

gnutls_deinit(*session);

597

621

return -1;

607

631

/* ignore client certificate if any. */

608

632

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

609

633

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

611

635

612

636

return 0;

613

637

}

617

641

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

618

642

619

643

/* Called when a Mandos server is found */

620

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

644

__attribute__((nonnull, warn_unused_result))

645

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

621

646

AvahiIfIndex if_index,

622

int af){

647

int af, mandos_context *mc){

623

648

int ret, tcp_sd = -1;

624

649

ssize_t sret;

625

union {

626

struct sockaddr_in in;

627

struct sockaddr_in6 in6;

628

} to;

650

struct sockaddr_storage to;

629

651

char *buffer = NULL;

630

652

char *decrypted_buffer = NULL;

631

653

size_t buffer_length = 0;

655

677

return -1;

656

678

}

657

679

658

ret = init_gnutls_session(&session);

680

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

681

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

682

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

683

bool match = false;

684

{

685

char *interface = NULL;

686

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

687

interface))){

688

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

689

match = true;

690

break;

691

}

692

}

693

}

694

if(not match){

695

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

696

connect to the server */

697

if(debug){

698

char interface[IF_NAMESIZE];

699

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

700

perror_plus("if_indextoname");

701

} else {

702

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

703

" \"%s\"\n",

704

if_indextoname((unsigned int)if_index,

705

interface));

706

}

707

}

708

return -1;

709

}

710

}

711

712

ret = init_gnutls_session(&session, mc);

659

713

if(ret != 0){

660

714

return -1;

661

715

}

662

716

663

717

if(debug){

664

718

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

665

PRIu16 "\n", ip, port);

719

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

666

720

}

667

721

668

722

tcp_sd = socket(pf, SOCK_STREAM, 0);

680

734

681

735

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

682

736

if(af == AF_INET6){

683

to.in6.sin6_family = (sa_family_t)af;

684

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

737

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

738

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

685

739

} else { /* IPv4 */

686

to.in.sin_family = (sa_family_t)af;

687

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

740

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

741

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

688

742

}

689

743

if(ret < 0 ){

690

744

int e = errno;

699

753

goto mandos_end;

700

754

}

701

755

if(af == AF_INET6){

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

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

708

-Wunreachable-code*/

756

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

757

if(IN6_IS_ADDR_LINKLOCAL

758

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

709

759

if(if_index == AVAHI_IF_UNSPEC){

710

760

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

711

761

" incomplete without a network interface\n");

713

763

goto mandos_end;

714

764

}

715

765

/* Set the network interface number as scope */

716

to.in6.sin6_scope_id = (uint32_t)if_index;

766

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

717

767

}

718

768

} else {

719

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

720

-Wconversion and

721

-Wunreachable-code */

769

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

722

770

}

723

771

724

772

if(quit_now){

732

780

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

733

781

perror_plus("if_indextoname");

734

782

} else {

735

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

736

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

783

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

784

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

737

785

}

738

786

} else {

739

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

740

ip, port);

787

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

788

ip, (uintmax_t)port);

741

789

}

742

790

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

791

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

744

const char *pcret;

745

792

if(af == AF_INET6){

746

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

747

sizeof(addrstr));

793

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

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

748

797

} else {

749

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

750

sizeof(addrstr));

798

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

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

751

802

}

752

if(pcret == NULL){

753

perror_plus("inet_ntop");

754

} else {

755

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

756

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

757

}

803

if(ret == EAI_SYSTEM){

804

perror_plus("getnameinfo");

805

} else if(ret != 0) {

806

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

807

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

808

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

758

809

}

759

810

}

760

811

764

815

}

765

816

766

817

if(af == AF_INET6){

767

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

818

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

819

sizeof(struct sockaddr_in6));

768

820

} else {

769

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

821

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

822

sizeof(struct sockaddr_in));

770

823

}

771

824

if(ret < 0){

772

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

825

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

773

826

int e = errno;

774

827

perror_plus("connect");

775

828

errno = e;

821

874

goto mandos_end;

822

875

}

823

876

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

877

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

878

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

879

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

880

gnutls_transport_set_ptr(session,

881

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

826

882

827

883

if(quit_now){

828

884

errno = EINTR;

933

989

if(buffer_length > 0){

934

990

ssize_t decrypted_buffer_size;

935

991

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

936

&decrypted_buffer);

992

&decrypted_buffer, mc);

937

993

if(decrypted_buffer_size >= 0){

938

994

939

995

written = 0;

987

1043

return retval;

988

1044

}

989

1045

1046

__attribute__((nonnull))

990

1047

static void resolve_callback(AvahiSServiceResolver *r,

991

1048

AvahiIfIndex interface,

992

1049

AvahiProtocol proto,

1000

1057

AVAHI_GCC_UNUSED AvahiStringList *txt,

1001

1058

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1002

1059

flags,

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

1005

1064

1006

1065

/* Called whenever a service has been resolved successfully or

1007

1066

timed out */

1016

1075

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

1017

1076

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

1018

1077

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

1078

avahi_strerror(avahi_server_errno

1079

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

1020

1080

break;

1021

1081

1022

1082

case AVAHI_RESOLVER_FOUND:

1028

1088

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

1029

1089

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

1030

1090

}

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

1033

1095

if(ret == 0){

1034

avahi_simple_poll_quit(mc.simple_poll);

1096

avahi_simple_poll_quit(simple_poll);

1035

1097

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1098

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

1099

avahi_proto_to_af(proto),

1100

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

1038

1101

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

1039

1102

" list\n", name);

1040

1103

}

1053

1116

const char *domain,

1054

1117

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1055

1118

flags,

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

1058

1123

1059

1124

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

1060

1125

is removed from the LAN */

1068

1133

case AVAHI_BROWSER_FAILURE:

1069

1134

1070

1135

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1136

avahi_strerror(avahi_server_errno

1137

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

1138

avahi_simple_poll_quit(simple_poll);

1073

1139

return;

1074

1140

1075

1141

case AVAHI_BROWSER_NEW:

1078

1144

the callback function is called the Avahi server will free the

1079

1145

resolver for us. */

1080

1146

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1147

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

1148

interface, protocol, name, type,

1149

domain, protocol, 0,

1150

resolve_callback, mc) == NULL)

1084

1151

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

1085

1152

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

1153

avahi_strerror(avahi_server_errno

1154

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

1087

1155

break;

1088

1156

1089

1157

case AVAHI_BROWSER_REMOVE:

1108

1176

signal_received = sig;

1109

1177

int old_errno = errno;

1110

1178

/* set main loop to exit */

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1113

1181

}

1114

1182

errno = old_errno;

1115

1183

}

1116

1184

1185

__attribute__((nonnull, warn_unused_result))

1117

1186

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

1118

1187

int ret;

1188

error_t ret_errno;

1119

1189

1120

1190

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

1121

1191

if(s < 0){

1192

ret_errno = errno;

1122

1193

perror_plus("socket");

1194

errno = ret_errno;

1123

1195

return false;

1124

1196

}

1125

1197

strcpy(ifr->ifr_name, ifname);

1126

1198

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

1199

if(ret == -1){

1128

1200

if(debug){

1201

ret_errno = errno;

1129

1202

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1130

1204

}

1131

1205

return false;

1132

1206

}

1133

1207

return true;

1134

1208

}

1135

1209

1210

__attribute__((nonnull, warn_unused_result))

1136

1211

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

1137

1212

1138

1213

/* Reject the loopback device */

1180

1255

* corresponds to an acceptable network device.

1181

1256

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

1182

1257

*/

1258

__attribute__((nonnull, warn_unused_result))

1183

1259

int good_interface(const struct dirent *if_entry){

1184

1260

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

1185

1261

return 0;

1201

1277

}

1202

1278

1203

1279

/*

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1244

}

1245

1280

* This function determines if a network interface is up.

1281

*/

1282

__attribute__((nonnull, warn_unused_result))

1283

bool interface_is_up(const char *interface){

1284

struct ifreq ifr;

1285

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

1286

if(debug){

1287

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

1288

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

1289

}

1290

return false;

1291

}

1292

1293

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

1294

}

1295

1296

/*

1297

* This function determines if a network interface is running

1298

*/

1299

__attribute__((nonnull, warn_unused_result))

1300

bool interface_is_running(const char *interface){

1301

struct ifreq ifr;

1302

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

1303

if(debug){

1304

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

1305

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

1306

}

1307

return false;

1308

}

1309

1310

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

1311

}

1312

1313

__attribute__((nonnull, pure, warn_unused_result))

1246

1314

int notdotentries(const struct dirent *direntry){

1247

1315

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

1248

1316

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

1255

1323

}

1256

1324

1257

1325

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

1326

__attribute__((nonnull, warn_unused_result))

1258

1327

int runnable_hook(const struct dirent *direntry){

1259

1328

int ret;

1260

1329

size_t sret;

1268

1337

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

1269

1338

"abcdefghijklmnopqrstuvwxyz"

1270

1339

"0123456789"

1271

"_-");

1340

"_.-");

1272

1341

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

1273

1342

/* Contains non-allowed characters */

1274

1343

if(debug){

1278

1347

return 0;

1279

1348

}

1280

1349

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1350

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

1289

1351

if(ret == -1){

1290

1352

if(debug){

1291

1353

perror_plus("Could not stat hook");

1315

1377

return 1;

1316

1378

}

1317

1379

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1319

1383

int ret;

1320

1384

struct timespec now;

1321

1385

struct timespec waited_time;

1322

1386

intmax_t block_time;

1323

1387

1324

1388

while(true){

1325

if(mc.current_server == NULL){

1326

if (debug){

1389

if(mc->current_server == NULL){

1390

if(debug){

1327

1391

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

1328

1392

" No timeout!\n");

1329

1393

}

1330

1394

ret = avahi_simple_poll_iterate(s, -1);

1331

1395

} else {

1332

if (debug){

1396

if(debug){

1333

1397

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

1334

1398

" it, or wait\n");

1335

1399

}

1342

1406

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

1343

1407

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

1344

1408

waited_time.tv_sec = (now.tv_sec

1345

- mc.current_server->last_seen.tv_sec);

1409

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

1346

1410

waited_time.tv_nsec = (now.tv_nsec

1347

- mc.current_server->last_seen.tv_nsec);

1411

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

1348

1412

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

1349

1413

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

1350

1414

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

1352

1416

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

1353

1417

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

1354

1418

1355

if (debug){

1419

if(debug){

1356

1420

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

1357

1421

block_time);

1358

1422

}

1359

1423

1360

1424

if(block_time <= 0){

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

1425

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

1426

mc->current_server->port,

1427

mc->current_server->if_index,

1428

mc->current_server->af, mc);

1365

1429

if(ret == 0){

1366

avahi_simple_poll_quit(mc.simple_poll);

1430

avahi_simple_poll_quit(s);

1367

1431

return 0;

1368

1432

}

1369

1433

ret = clock_gettime(CLOCK_MONOTONIC,

1370

&mc.current_server->last_seen);

1434

&mc->current_server->last_seen);

1371

1435

if(ret == -1){

1372

1436

perror_plus("clock_gettime");

1373

1437

return -1;

1374

1438

}

1375

mc.current_server = mc.current_server->next;

1439

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

1376

1440

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

1377

1441

servers, but don't block */

1378

1442

}

1380

1444

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

1381

1445

}

1382

1446

if(ret != 0){

1383

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

1447

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

1384

1448

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

1385

1449

}

1386

1450

}

1387

1451

}

1388

1452

}

1389

1453

1390

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

1454

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

1455

__attribute__((warn_unused_result))

1456

error_t raise_privileges(void){

1457

error_t old_errno = errno;

1458

error_t ret_errno = 0;

1459

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

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

__attribute__((warn_unused_result))

1469

error_t raise_privileges_permanently(void){

1470

error_t old_errno = errno;

1471

error_t ret_errno = raise_privileges();

1472

if(ret_errno != 0){

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

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

1477

ret_errno = errno;

1478

perror_plus("seteuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

__attribute__((warn_unused_result))

1486

error_t lower_privileges(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("seteuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

perror_plus("setuid");

1505

}

1506

errno = old_errno;

1507

return ret_errno;

1508

}

1509

1510

__attribute__((nonnull))

1511

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

1391

1512

const float delay){

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1513

struct dirent **direntries = NULL;

1514

if(hookdir_fd == -1){

1515

hookdir_fd = open(hookdir, O_RDONLY);

1516

if(hookdir_fd == -1){

1517

if(errno == ENOENT){

1518

if(debug){

1519

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

1520

" found\n", hookdir);

1521

}

1522

} else {

1523

perror_plus("open");

1524

}

1525

return;

1526

}

1527

}

1528

#ifdef __GLIBC__

1529

#if __GLIBC_PREREQ(2, 15)

1530

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

1531

runnable_hook, alphasort);

1532

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

1533

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

1534

alphasort);

1535

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

1536

#else /* not __GLIBC__ */

1537

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

1538

alphasort);

1539

#endif /* not __GLIBC__ */

1397

1540

if(numhooks == -1){

1398

1541

perror_plus("scandir");

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

1542

return;

1543

}

1544

struct dirent *direntry;

1545

int ret;

1546

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

1547

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

1548

direntry = direntries[i];

1549

if(debug){

1550

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

1551

direntry->d_name);

1552

}

1553

pid_t hook_pid = fork();

1554

if(hook_pid == 0){

1555

/* Child */

1556

/* Raise privileges */

1557

if(raise_privileges_permanently() != 0){

1558

perror_plus("Failed to raise privileges");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Set group */

1562

errno = 0;

1563

ret = setgid(0);

1564

if(ret == -1){

1565

perror_plus("setgid");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Reset supplementary groups */

1569

errno = 0;

1570

ret = setgroups(0, NULL);

1571

if(ret == -1){

1572

perror_plus("setgroups");

1573

_exit(EX_NOPERM);

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

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

1591

if(ret == -1){

1592

perror_plus("setenv");

1593

_exit(EX_OSERR);

1594

}

1595

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

1596

if(ret == -1){

1597

perror_plus("setenv");

1598

_exit(EX_OSERR);

1599

}

1600

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

1601

if(ret == -1){

1602

perror_plus("setenv");

1603

_exit(EX_OSERR);

1604

}

1605

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

1606

if(ret == -1){

1607

perror_plus("setenv");

1608

_exit(EX_OSERR);

1609

}

1610

char *delaystring;

1611

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

1612

if(ret == -1){

1406

1613

perror_plus("asprintf");

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

1614

_exit(EX_OSERR);

1615

}

1616

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

1617

if(ret == -1){

1475

1618

free(delaystring);

1476

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

1477

perror_plus("execl");

1478

_exit(EXIT_FAILURE);

1479

}

1480

} else {

1481

int status;

1482

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

1483

perror_plus("waitpid");

1484

free(fullname);

1485

continue;

1486

}

1487

if(WIFEXITED(status)){

1488

if(WEXITSTATUS(status) != 0){

1489

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

1490

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

1491

WEXITSTATUS(status));

1492

free(fullname);

1493

continue;

1494

}

1495

} else if(WIFSIGNALED(status)){

1496

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

1497

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

1498

WTERMSIG(status));

1499

free(fullname);

1500

continue;

1501

} else {

1502

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

1503

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

1504

free(fullname);

1505

continue;

1506

}

1507

}

1508

free(fullname);

1509

if(debug){

1510

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

1511

direntry->d_name);

1512

}

1513

}

1514

close(devnull);

1515

}

1516

return true;

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

free(delaystring);

1623

if(connect_to != NULL){

1624

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

1625

if(ret == -1){

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

}

1630

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

1631

if(hook_fd == -1){

1632

perror_plus("openat");

1633

_exit(EXIT_FAILURE);

1634

}

1635

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

1636

perror_plus("close");

1637

_exit(EXIT_FAILURE);

1638

}

1639

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

1640

environ) == -1){

1641

perror_plus("fexecve");

1642

_exit(EXIT_FAILURE);

1643

}

1644

} else {

1645

int status;

1646

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

1647

perror_plus("waitpid");

1648

continue;

1649

}

1650

if(WIFEXITED(status)){

1651

if(WEXITSTATUS(status) != 0){

1652

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

1653

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

1654

WEXITSTATUS(status));

1655

continue;

1656

}

1657

} else if(WIFSIGNALED(status)){

1658

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

1659

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

1660

WTERMSIG(status));

1661

continue;

1662

} else {

1663

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

1664

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

1665

continue;

1666

}

1667

}

1668

if(debug){

1669

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

1670

direntry->d_name);

1671

}

1672

}

1673

free(direntries);

1674

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

1675

perror_plus("close");

1676

} else {

1677

hookdir_fd = -1;

1678

}

1679

close(devnull);

1680

}

1681

1682

__attribute__((nonnull, warn_unused_result))

1683

error_t bring_up_interface(const char *const interface,

1684

const float delay){

1685

error_t old_errno = errno;

1686

int ret;

1687

struct ifreq network;

1688

unsigned int if_index = if_nametoindex(interface);

1689

if(if_index == 0){

1690

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

1691

errno = old_errno;

1692

return ENXIO;

1693

}

1694

1695

if(quit_now){

1696

errno = old_errno;

1697

return EINTR;

1698

}

1699

1700

if(not interface_is_up(interface)){

1701

error_t ret_errno = 0, ioctl_errno = 0;

1702

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

1703

ret_errno = errno;

1704

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

1705

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

1706

errno = old_errno;

1707

return ret_errno;

1708

}

1709

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

1710

1711

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

1712

if(sd == -1){

1713

ret_errno = errno;

1714

perror_plus("socket");

1715

errno = old_errno;

1716

return ret_errno;

1717

}

1718

1719

if(quit_now){

1720

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

1721

if(ret == -1){

1722

perror_plus("close");

1723

}

1724

errno = old_errno;

1725

return EINTR;

1726

}

1727

1728

if(debug){

1729

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

1730

interface);

1731

}

1732

1733

/* Raise privileges */

1734

ret_errno = raise_privileges();

1735

if(ret_errno != 0){

1736

perror_plus("Failed to raise privileges");

1737

}

1738

1739

#ifdef __linux__

1740

int ret_linux;

1741

bool restore_loglevel = false;

1742

if(ret_errno == 0){

1743

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1744

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

1745

ret_linux = klogctl(8, NULL, 5);

1746

if(ret_linux == -1){

1747

perror_plus("klogctl");

1748

} else {

1749

restore_loglevel = true;

1750

}

1751

}

1752

#endif /* __linux__ */

1753

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

1754

ioctl_errno = errno;

1755

#ifdef __linux__

1756

if(restore_loglevel){

1757

ret_linux = klogctl(7, NULL, 0);

1758

if(ret_linux == -1){

1759

perror_plus("klogctl");

1760

}

1761

}

1762

#endif /* __linux__ */

1763

1764

/* If raise_privileges() succeeded above */

1765

if(ret_errno == 0){

1766

/* Lower privileges */

1767

ret_errno = lower_privileges();

1768

if(ret_errno != 0){

1769

errno = ret_errno;

1770

perror_plus("Failed to lower privileges");

1771

}

1772

}

1773

1774

/* Close the socket */

1775

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

1776

if(ret == -1){

1777

perror_plus("close");

1778

}

1779

1780

if(ret_setflags == -1){

1781

errno = ioctl_errno;

1782

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1783

errno = old_errno;

1784

return ioctl_errno;

1785

}

1786

} else if(debug){

1787

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

1788

interface);

1789

}

1790

1791

/* Sleep checking until interface is running.

1792

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

1793

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

1794

if(interface_is_running(interface)){

1795

break;

1796

}

1797

struct timespec sleeptime = { .tv_nsec = 250000000 };

1798

ret = nanosleep(&sleeptime, NULL);

1799

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

1800

perror_plus("nanosleep");

1801

}

1802

}

1803

1804

errno = old_errno;

1805

return 0;

1806

}

1807

1808

__attribute__((nonnull, warn_unused_result))

1809

error_t take_down_interface(const char *const interface){

1810

error_t old_errno = errno;

1811

struct ifreq network;

1812

unsigned int if_index = if_nametoindex(interface);

1813

if(if_index == 0){

1814

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

1815

errno = old_errno;

1816

return ENXIO;

1817

}

1818

if(interface_is_up(interface)){

1819

error_t ret_errno = 0, ioctl_errno = 0;

1820

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

1821

ret_errno = errno;

1822

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

1823

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

1824

errno = old_errno;

1825

return ret_errno;

1826

}

1827

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

1828

1829

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

1830

if(sd == -1){

1831

ret_errno = errno;

1832

perror_plus("socket");

1833

errno = old_errno;

1834

return ret_errno;

1835

}

1836

1837

if(debug){

1838

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

1839

interface);

1840

}

1841

1842

/* Raise privileges */

1843

ret_errno = raise_privileges();

1844

if(ret_errno != 0){

1845

perror_plus("Failed to raise privileges");

1846

}

1847

1848

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

1849

ioctl_errno = errno;

1850

1851

/* If raise_privileges() succeeded above */

1852

if(ret_errno == 0){

1853

/* Lower privileges */

1854

ret_errno = lower_privileges();

1855

if(ret_errno != 0){

1856

errno = ret_errno;

1857

perror_plus("Failed to lower privileges");

1858

}

1859

}

1860

1861

/* Close the socket */

1862

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

1863

if(ret == -1){

1864

perror_plus("close");

1865

}

1866

1867

if(ret_setflags == -1){

1868

errno = ioctl_errno;

1869

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1870

errno = old_errno;

1871

return ioctl_errno;

1872

}

1873

} else if(debug){

1874

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

1875

interface);

1876

}

1877

1878

errno = old_errno;

1879

return 0;

1517

1880

}

1518

1881

1519

1882

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

1883

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

1884

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

1885

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

1886

.interfaces = NULL, .interfaces_size = 0 };

1520

1887

AvahiSServiceBrowser *sb = NULL;

1521

int error;

1888

error_t ret_errno;

1522

1889

int ret;

1523

1890

intmax_t tmpmax;

1524

1891

char *tmp;

1525

1892

int exitcode = EXIT_SUCCESS;

1526

const char *interface = "";

1527

struct ifreq network;

1528

int sd = -1;

1529

bool take_down_interface = false;

1530

uid_t uid;

1531

gid_t gid;

1532

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

1533

bool tempdir_created = false;

1893

char *interfaces_to_take_down = NULL;

1894

size_t interfaces_to_take_down_size = 0;

1895

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

1896

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

1897

char *tempdir = NULL;

1534

1898

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1535

1899

const char *seckey = PATHDIR "/" SECKEY;

1536

1900

const char *pubkey = PATHDIR "/" PUBKEY;

1901

char *interfaces_hooks = NULL;

1537

1902

1538

1903

bool gnutls_initialized = false;

1539

1904

bool gpgme_initialized = false;

1601

1966

.group = 2 },

1602

1967

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

1603

1968

.arg = "SECONDS",

1604

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

1969

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

1605

1970

.group = 2 },

1606

1971

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

1607

1972

.arg = "DIR",

1630

1995

connect_to = arg;

1631

1996

break;

1632

1997

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

1633

interface = arg;

1998

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

1999

arg, (int)',');

2000

if(ret_errno != 0){

2001

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

2002

}

1634

2003

break;

1635

2004

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

1636

2005

seckey = arg;

1713

2082

/* Work around Debian bug #633582:

1714

2083

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

1715

2084

1716

/* Re-raise priviliges */

1717

errno = 0;

1718

ret = seteuid(0);

1719

if(ret == -1){

1720

perror_plus("seteuid");

2085

/* Re-raise privileges */

2086

ret_errno = raise_privileges();

2087

if(ret_errno != 0){

2088

errno = ret_errno;

2089

perror_plus("Failed to raise privileges");

1721

2090

} else {

1722

2091

struct stat st;

1723

2092

1764

2133

}

1765

2134

1766

2135

/* Lower privileges */

1767

errno = 0;

1768

ret = seteuid(uid);

1769

if(ret == -1){

1770

perror_plus("seteuid");

2136

ret_errno = lower_privileges();

2137

if(ret_errno != 0){

2138

errno = ret_errno;

2139

perror_plus("Failed to lower privileges");

2140

}

2141

}

2142

}

2143

2144

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

2145

{

2146

char *interface = NULL;

2147

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

2148

interface))){

2149

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

2150

and if_nametoindex(interface) == 0){

2151

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

2152

fprintf_plus(stderr, "Not using nonexisting interface"

2153

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

2154

}

2155

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

2156

interface = NULL;

1771

2157

}

1772

2158

}

1773

2159

}

1774

2160

1775

2161

/* Run network hooks */

1776

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

1777

goto end;

2162

{

2163

if(mc.interfaces != NULL){

2164

interfaces_hooks = malloc(mc.interfaces_size);

2165

if(interfaces_hooks == NULL){

2166

perror_plus("malloc");

2167

goto end;

2168

}

2169

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

2170

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

2171

}

2172

run_network_hooks("start", interfaces_hooks != NULL ?

2173

interfaces_hooks : "", delay);

1778

2174

}

1779

2175

1780

2176

if(not debug){

1781

2177

avahi_set_log_function(empty_log);

1782

2178

}

1783

2179

1784

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

1785

struct dirent **direntries;

1786

/* First look for interfaces that are up */

1787

ret = scandir(sys_class_net, &direntries, up_interface,

1788

alphasort);

1789

if(ret == 0){

1790

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

1791

free(direntries);

1792

ret = scandir(sys_class_net, &direntries, good_interface,

1793

alphasort);

1794

}

1795

if(ret >= 1){

1796

/* Pick the first interface returned */

1797

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

1798

if(debug){

1799

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

1800

}

1801

if(interface == NULL){

1802

perror_plus("malloc");

1803

free(direntries);

1804

exitcode = EXIT_FAILURE;

1805

goto end;

1806

}

1807

free(direntries);

1808

} else {

1809

free(direntries);

1810

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

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

}

1815

1816

2180

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

1817

2181

from the signal handler */

1818

2182

/* Initialize the pseudo-RNG for Avahi */

1819

2183

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

1820

mc.simple_poll = avahi_simple_poll_new();

1821

if(mc.simple_poll == NULL){

2184

simple_poll = avahi_simple_poll_new();

2185

if(simple_poll == NULL){

1822

2186

fprintf_plus(stderr,

1823

2187

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

1824

2188

exitcode = EX_UNAVAILABLE;

1888

2252

}

1889

2253

}

1890

2254

1891

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

1892

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

1893

if_index = (AvahiIfIndex) if_nametoindex(interface);

1894

if(if_index == 0){

1895

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

1896

exitcode = EX_UNAVAILABLE;

1897

goto end;

1898

}

1899

1900

if(quit_now){

1901

goto end;

1902

}

1903

1904

/* Re-raise priviliges */

1905

errno = 0;

1906

ret = seteuid(0);

1907

if(ret == -1){

1908

perror_plus("seteuid");

1909

}

1910

1911

#ifdef __linux__

1912

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1913

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

1914

ret = klogctl(8, NULL, 5);

1915

bool restore_loglevel = true;

1916

if(ret == -1){

1917

restore_loglevel = false;

1918

perror_plus("klogctl");

1919

}

1920

#endif /* __linux__ */

1921

1922

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1923

if(sd < 0){

1924

perror_plus("socket");

1925

exitcode = EX_OSERR;

1926

#ifdef __linux__

1927

if(restore_loglevel){

1928

ret = klogctl(7, NULL, 0);

1929

if(ret == -1){

1930

perror_plus("klogctl");

1931

}

1932

}

1933

#endif /* __linux__ */

1934

/* Lower privileges */

1935

errno = 0;

1936

ret = seteuid(uid);

1937

if(ret == -1){

1938

perror_plus("seteuid");

1939

}

1940

goto end;

1941

}

1942

strcpy(network.ifr_name, interface);

1943

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

1944

if(ret == -1){

1945

perror_plus("ioctl SIOCGIFFLAGS");

1946

#ifdef __linux__

1947

if(restore_loglevel){

1948

ret = klogctl(7, NULL, 0);

1949

if(ret == -1){

1950

perror_plus("klogctl");

1951

}

1952

}

1953

#endif /* __linux__ */

1954

exitcode = EX_OSERR;

1955

/* Lower privileges */

1956

errno = 0;

1957

ret = seteuid(uid);

1958

if(ret == -1){

1959

perror_plus("seteuid");

1960

}

1961

goto end;

1962

}

1963

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

1964

network.ifr_flags |= IFF_UP;

1965

take_down_interface = true;

1966

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

1967

if(ret == -1){

1968

take_down_interface = false;

1969

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1970

exitcode = EX_OSERR;

1971

#ifdef __linux__

1972

if(restore_loglevel){

1973

ret = klogctl(7, NULL, 0);

1974

if(ret == -1){

1975

perror_plus("klogctl");

2255

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

2256

if(mc.interfaces == NULL){

2257

struct dirent **direntries = NULL;

2258

/* Look for any good interfaces */

2259

ret = scandir(sys_class_net, &direntries, good_interface,

2260

alphasort);

2261

if(ret >= 1){

2262

/* Add all found interfaces to interfaces list */

2263

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

2264

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

2265

direntries[i]->d_name);

2266

if(ret_errno != 0){

2267

errno = ret_errno;

2268

perror_plus("argz_add");

2269

continue;

2270

}

2271

if(debug){

2272

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

2273

direntries[i]->d_name);

2274

}

2275

}

2276

free(direntries);

2277

} else {

2278

if(ret == 0){

2279

free(direntries);

2280

}

2281

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

2282

exitcode = EXIT_FAILURE;

2283

goto end;

2284

}

2285

}

2286

2287

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

2288

{

2289

char *interface = NULL;

2290

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

2291

interface))){

2292

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

2293

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

2294

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

2295

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

2296

interface);

2297

interface = NULL;

2298

while((interface = argz_next(mc.interfaces,

2299

mc.interfaces_size, interface))){

2300

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

2301

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

2302

interface);

2303

interface = NULL;

1976

2304

}

1977

2305

}

1978

#endif /* __linux__ */

1979

/* Lower privileges */

1980

errno = 0;

1981

ret = seteuid(uid);

1982

if(ret == -1){

1983

perror_plus("seteuid");

1984

}

1985

goto end;

1986

}

1987

}

1988

/* Sleep checking until interface is running.

1989

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

1990

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

1991

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

1992

if(ret == -1){

1993

perror_plus("ioctl SIOCGIFFLAGS");

1994

} else if(network.ifr_flags & IFF_RUNNING){

1995

2306

break;

1996

2307

}

1997

struct timespec sleeptime = { .tv_nsec = 250000000 };

1998

ret = nanosleep(&sleeptime, NULL);

1999

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

2000

perror_plus("nanosleep");

2001

}

2002

}

2003

if(not take_down_interface){

2004

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

2005

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

2006

if(ret == -1){

2007

perror_plus("close");

2008

}

2009

}

2010

#ifdef __linux__

2011

if(restore_loglevel){

2012

/* Restores kernel loglevel to default */

2013

ret = klogctl(7, NULL, 0);

2014

if(ret == -1){

2015

perror_plus("klogctl");

2016

}

2017

}

2018

#endif /* __linux__ */

2019

/* Lower privileges */

2020

errno = 0;

2021

/* Lower privileges */

2022

ret = seteuid(uid);

2023

if(ret == -1){

2024

perror_plus("seteuid");

2025

}

2308

bool interface_was_up = interface_is_up(interface);

2309

errno = bring_up_interface(interface, delay);

2310

if(not interface_was_up){

2311

if(errno != 0){

2312

perror_plus("Failed to bring up interface");

2313

} else {

2314

errno = argz_add(&interfaces_to_take_down,

2315

&interfaces_to_take_down_size,

2316

interface);

2317

if(errno != 0){

2318

perror_plus("argz_add");

2319

}

2320

}

2321

}

2322

}

2323

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

2324

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

2325

}

2326

}

2327

2328

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

2329

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

2330

if(debug){

2331

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

2332

mc.interfaces);

2333

}

2334

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

2026

2335

}

2027

2336

2028

2337

if(quit_now){

2029

2338

goto end;

2030

2339

}

2031

2340

2032

ret = init_gnutls_global(pubkey, seckey);

2341

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

2033

2342

if(ret == -1){

2034

2343

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

2035

2344

exitcode = EX_UNAVAILABLE;

2042

2351

goto end;

2043

2352

}

2044

2353

2045

if(mkdtemp(tempdir) == NULL){

2354

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

2355

tempdir = mkdtemp(run_tempdir);

2356

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

2357

if(debug){

2358

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

2359

run_tempdir, old_tempdir);

2360

}

2361

tempdir = mkdtemp(old_tempdir);

2362

}

2363

if(tempdir == NULL){

2046

2364

perror_plus("mkdtemp");

2047

2365

goto end;

2048

2366

}

2049

tempdir_created = true;

2050

2367

2051

2368

if(quit_now){

2052

2369

goto end;

2053

2370

}

2054

2371

2055

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

2372

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

2056

2373

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

2057

2374

exitcode = EX_UNAVAILABLE;

2058

2375

goto end;

2068

2385

/* Connect directly, do not use Zeroconf */

2069

2386

/* (Mainly meant for debugging) */

2070

2387

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

2388

2071

2389

if(address == NULL){

2072

2390

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

2073

2391

exitcode = EX_USAGE;

2078

2396

goto end;

2079

2397

}

2080

2398

2081

uint16_t port;

2399

in_port_t port;

2082

2400

errno = 0;

2083

2401

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

2084

2402

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

2085

or tmpmax != (uint16_t)tmpmax){

2403

or tmpmax != (in_port_t)tmpmax){

2086

2404

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

2087

2405

exitcode = EX_USAGE;

2088

2406

goto end;

2089

2407

}

2090

2408

2091

2409

if(quit_now){

2092

2410

goto end;

2093

2411

}

2094

2412

2095

port = (uint16_t)tmpmax;

2413

port = (in_port_t)tmpmax;

2096

2414

*address = '\0';

2097

2415

/* Colon in address indicates IPv6 */

2098

2416

int af;

2114

2432

}

2115

2433

2116

2434

while(not quit_now){

2117

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

2435

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

2436

&mc);

2118

2437

if(quit_now or ret == 0){

2119

2438

break;

2120

2439

}

2122

2441

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

2123

2442

(int)retry_interval);

2124

2443

}

2125

sleep((int)retry_interval);

2444

sleep((unsigned int)retry_interval);

2126

2445

}

2127

2446

2128

if (not quit_now){

2447

if(not quit_now){

2129

2448

exitcode = EXIT_SUCCESS;

2130

2449

}

2131

2450

2146

2465

config.publish_domain = 0;

2147

2466

2148

2467

/* Allocate a new server */

2149

mc.server = avahi_server_new(avahi_simple_poll_get

2150

(mc.simple_poll), &config, NULL,

2151

NULL, &error);

2468

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2469

&config, NULL, NULL, &ret_errno);

2152

2470

2153

2471

/* Free the Avahi configuration data */

2154

2472

avahi_server_config_free(&config);

2157

2475

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

2158

2476

if(mc.server == NULL){

2159

2477

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

2160

avahi_strerror(error));

2478

avahi_strerror(ret_errno));

2161

2479

exitcode = EX_UNAVAILABLE;

2162

2480

goto end;

2163

2481

}

2169

2487

/* Create the Avahi service browser */

2170

2488

sb = avahi_s_service_browser_new(mc.server, if_index,

2171

2489

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2172

NULL, 0, browse_callback, NULL);

2490

NULL, 0, browse_callback,

2491

(void *)&mc);

2173

2492

if(sb == NULL){

2174

2493

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

2175

2494

avahi_strerror(avahi_server_errno(mc.server)));

2186

2505

if(debug){

2187

2506

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

2188

2507

}

2189

2190

ret = avahi_loop_with_timeout(mc.simple_poll,

2191

(int)(retry_interval * 1000));

2508

2509

ret = avahi_loop_with_timeout(simple_poll,

2510

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

2192

2511

if(debug){

2193

2512

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

2194

2513

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

2201

2520

}

2202

2521

2203

2522

/* Cleanup things */

2523

free(mc.interfaces);

2524

2204

2525

if(sb != NULL)

2205

2526

avahi_s_service_browser_free(sb);

2206

2527

2207

2528

if(mc.server != NULL)

2208

2529

avahi_server_free(mc.server);

2209

2530

2210

if(mc.simple_poll != NULL)

2211

avahi_simple_poll_free(mc.simple_poll);

2531

if(simple_poll != NULL)

2532

avahi_simple_poll_free(simple_poll);

2212

2533

2213

2534

if(gnutls_initialized){

2214

2535

gnutls_certificate_free_credentials(mc.cred);

2231

2552

}

2232

2553

}

2233

2554

2234

/* Run network hooks */

2235

run_network_hooks("stop", interface, delay);

2236

2237

/* Re-raise priviliges */

2555

/* Re-raise privileges */

2238

2556

{

2239

errno = 0;

2240

ret = seteuid(0);

2241

if(ret == -1){

2242

perror_plus("seteuid");

2557

ret_errno = raise_privileges();

2558

if(ret_errno != 0){

2559

perror_plus("Failed to raise privileges");

2560

} else {

2561

2562

/* Run network hooks */

2563

run_network_hooks("stop", interfaces_hooks != NULL ?

2564

interfaces_hooks : "", delay);

2565

2566

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

2567

{

2568

char *interface = NULL;

2569

while((interface=argz_next(interfaces_to_take_down,

2570

interfaces_to_take_down_size,

2571

interface))){

2572

ret_errno = take_down_interface(interface);

2573

if(ret_errno != 0){

2574

errno = ret_errno;

2575

perror_plus("Failed to take down interface");

2576

}

2577

}

2578

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

2579

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

2580

" down\n");

2581

}

2582

}

2243

2583

}

2244

2584

2245

/* Take down the network interface */

2246

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

2247

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

2248

if(ret == -1){

2249

perror_plus("ioctl SIOCGIFFLAGS");

2250

} else if(network.ifr_flags & IFF_UP){

2251

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

2252

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

2253

if(ret == -1){

2254

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2255

}

2256

}

2257

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

2258

if(ret == -1){

2259

perror_plus("close");

2260

}

2585

ret_errno = lower_privileges_permanently();

2586

if(ret_errno != 0){

2587

perror_plus("Failed to lower privileges permanently");

2261

2588

}

2262

2589

}

2263

/* Lower privileges permanently */

2264

errno = 0;

2265

ret = setuid(uid);

2266

if(ret == -1){

2267

perror_plus("setuid");

2268

}

2590

2591

free(interfaces_to_take_down);

2592

free(interfaces_hooks);

2269

2593

2270

2594

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

2271

if(tempdir_created){

2595

if(tempdir != NULL){

2272

2596

struct dirent **direntries = NULL;

2273

struct dirent *direntry = NULL;

2274

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

2275

alphasort);

2276

if (numentries > 0){

2277

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

2278

direntry = direntries[i];

2279

char *fullname = NULL;

2280

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

2281

direntry->d_name);

2282

if(ret < 0){

2283

perror_plus("asprintf");

2284

continue;

2285

}

2286

ret = remove(fullname);

2287

if(ret == -1){

2288

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

2289

strerror(errno));

2290

}

2291

free(fullname);

2597

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

2598

O_NOFOLLOW));

2599

if(tempdir_fd == -1){

2600

perror_plus("open");

2601

} else {

2602

#ifdef __GLIBC__

2603

#if __GLIBC_PREREQ(2, 15)

2604

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

2605

notdotentries, alphasort);

2606

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

2607

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

2608

alphasort);

2609

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

2610

#else /* not __GLIBC__ */

2611

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

2612

alphasort);

2613

#endif /* not __GLIBC__ */

2614

if(numentries >= 0){

2615

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

2616

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

2617

if(ret == -1){

2618

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

2619

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

2620

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

2621

}

2622

}

2623

2624

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

2625

free(direntries);

2626

if(numentries == -1){

2627

perror_plus("scandir");

2628

}

2629

ret = rmdir(tempdir);

2630

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

2631

perror_plus("rmdir");

2632

}

2292

2633

}

2293

}

2294

2295

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

2296

free(direntries);

2297

if (numentries == -1){

2298

perror_plus("scandir");

2299

}

2300

ret = rmdir(tempdir);

2301

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

2302

perror_plus("rmdir");

2634

TEMP_FAILURE_RETRY(close(tempdir_fd));

2303

2635

}

2304

2636

}

2305

2637