/mandos/release : revision 237.7.241

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

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect() */

58

inet_pton(), connect(),

59

getnameinfo() */

59

60

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

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() */

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

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program_invocation_short_name */

67

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

74

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

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

76

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

77

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

77

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

78

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

79

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

80

argp_state, struct argp,

88

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

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WEXITSTATUS(), WTERMSIG() */

90

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

91

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

92

argz_delete(), argz_append(),

93

argz_stringify(), argz_add(),

94

argz_count() */

95

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

96

EAI_SYSTEM, gai_strerror() */

91

97

92

98

#ifdef __linux__

93

99

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

135

141

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

136

142

char *connect_to = NULL;

137

143

const char *hookdir = HOOKDIR;

144

int hookdir_fd = -1;

138

145

uid_t uid = 65534;

139

146

gid_t gid = 65534;

140

147

141

148

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

142

149

typedef struct server{

143

150

const char *ip;

144

uint16_t port;

151

in_port_t port;

145

152

AvahiIfIndex if_index;

146

153

int af;

147

154

struct timespec last_seen;

151

158

152

159

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

153

160

typedef struct {

154

AvahiSimplePoll *simple_poll;

155

161

AvahiServer *server;

156

162

gnutls_certificate_credentials_t cred;

157

163

unsigned int dh_bits;

159

165

const char *priority;

160

166

gpgme_ctx_t ctx;

161

167

server *current_server;

168

char *interfaces;

169

size_t interfaces_size;

162

170

} mandos_context;

163

171

164

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

165

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

166

.dh_bits = 1024, .priority = "SECURE256"

167

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

168

.current_server = NULL };

172

/* global so signal handler can reach it*/

173

AvahiSimplePoll *simple_poll;

169

174

170

175

sig_atomic_t quit_now = 0;

171

176

int signal_received = 0;

179

184

perror(print_text);

180

185

}

181

186

182

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

187

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

183

188

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

184

189

va_list ap;

185

190

va_start (ap, format);

186

191

187

192

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

188

193

program_invocation_short_name));

189

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

194

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

190

195

}

191

196

192

197

/*

194

199

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

195

200

* "buffer_length" is how much is already used.

196

201

*/

202

__attribute__((nonnull, warn_unused_result))

197

203

size_t incbuffer(char **buffer, size_t buffer_length,

198

204

size_t buffer_capacity){

199

205

if(buffer_length + BUFFER_SIZE > buffer_capacity){

200

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

201

if(buffer == NULL){

206

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

207

if(new_buf == NULL){

208

int old_errno = errno;

209

free(*buffer);

210

errno = old_errno;

211

*buffer = NULL;

202

212

return 0;

203

213

}

214

*buffer = new_buf;

204

215

buffer_capacity += BUFFER_SIZE;

205

216

}

206

217

return buffer_capacity;

207

218

}

208

219

209

220

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

210

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

211

int af){

221

__attribute__((nonnull, warn_unused_result))

222

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

223

int af, server **current_server){

212

224

int ret;

213

225

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

214

226

if(new_server == NULL){

223

235

perror_plus("strdup");

224

236

return false;

225

237

}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

242

}

226

243

/* Special case of first server */

227

if (mc.current_server == NULL){

244

if(*current_server == NULL){

228

245

new_server->next = new_server;

229

246

new_server->prev = new_server;

230

mc.current_server = new_server;

231

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

247

*current_server = new_server;

232

248

} else {

233

new_server->next = mc.current_server;

234

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

249

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

250

new_server->next = *current_server;

251

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

235

252

new_server->prev->next = new_server;

236

mc.current_server->prev = new_server;

237

}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

253

(*current_server)->prev = new_server;

242

254

}

243

255

return true;

244

256

}

246

258

/*

247

259

* Initialize GPGME.

248

260

*/

249

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

250

const char *tempdir){

261

__attribute__((nonnull, warn_unused_result))

262

static bool init_gpgme(const char * const seckey,

263

const char * const pubkey,

264

const char * const tempdir,

265

mandos_context *mc){

251

266

gpgme_error_t rc;

252

267

gpgme_engine_info_t engine_info;

253

268

254

255

269

/*

256

270

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

257

271

*/

258

bool import_key(const char *filename){

272

bool import_key(const char * const filename){

259

273

int ret;

260

274

int fd;

261

275

gpgme_data_t pgp_data;

273

287

return false;

274

288

}

275

289

276

rc = gpgme_op_import(mc.ctx, pgp_data);

290

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

277

291

if(rc != GPG_ERR_NO_ERROR){

278

292

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

279

293

gpgme_strsource(rc), gpgme_strerror(rc));

323

337

}

324

338

325

339

/* Create new GPGME "context" */

326

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

340

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

327

341

if(rc != GPG_ERR_NO_ERROR){

328

342

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

329

343

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

342

356

* Decrypt OpenPGP data.

343

357

* Returns -1 on error

344

358

*/

359

__attribute__((nonnull, warn_unused_result))

345

360

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

361

size_t crypto_size,

347

char **plaintext){

362

char **plaintext,

363

mandos_context *mc){

348

364

gpgme_data_t dh_crypto, dh_plain;

349

365

gpgme_error_t rc;

350

366

ssize_t ret;

376

392

377

393

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

378

394

data buffer */

379

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

395

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

380

396

if(rc != GPG_ERR_NO_ERROR){

381

397

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

382

398

gpgme_strsource(rc), gpgme_strerror(rc));

383

399

plaintext_length = -1;

384

400

if(debug){

385

401

gpgme_decrypt_result_t result;

386

result = gpgme_op_decrypt_result(mc.ctx);

402

result = gpgme_op_decrypt_result(mc->ctx);

387

403

if(result == NULL){

388

404

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

389

405

} else {

466

482

return plaintext_length;

467

483

}

468

484

469

static const char * safer_gnutls_strerror(int value){

470

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

471

-Wunreachable-code */

485

__attribute__((warn_unused_result))

486

static const char *safer_gnutls_strerror(int value){

487

const char *ret = gnutls_strerror(value);

472

488

if(ret == NULL)

473

489

ret = "(unknown)";

474

490

return ret;

475

491

}

476

492

477

493

/* GnuTLS log function callback */

494

__attribute__((nonnull))

478

495

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

479

496

const char* string){

480

497

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

481

498

}

482

499

500

__attribute__((nonnull, warn_unused_result))

483

501

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename){

502

const char *seckeyfilename,

503

mandos_context *mc){

485

504

int ret;

486

505

487

506

if(debug){

504

523

}

505

524

506

525

/* OpenPGP credentials */

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

526

ret = gnutls_certificate_allocate_credentials(&mc->cred);

508

527

if(ret != GNUTLS_E_SUCCESS){

509

528

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

510

529

safer_gnutls_strerror(ret));

520

539

}

521

540

522

541

ret = gnutls_certificate_set_openpgp_key_file

523

(mc.cred, pubkeyfilename, seckeyfilename,

542

(mc->cred, pubkeyfilename, seckeyfilename,

524

543

GNUTLS_OPENPGP_FMT_BASE64);

525

544

if(ret != GNUTLS_E_SUCCESS){

526

545

fprintf_plus(stderr,

532

551

}

533

552

534

553

/* GnuTLS server initialization */

535

ret = gnutls_dh_params_init(&mc.dh_params);

554

ret = gnutls_dh_params_init(&mc->dh_params);

536

555

if(ret != GNUTLS_E_SUCCESS){

537

556

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

557

" initialization: %s\n",

539

558

safer_gnutls_strerror(ret));

540

559

goto globalfail;

541

560

}

542

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

561

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

543

562

if(ret != GNUTLS_E_SUCCESS){

544

563

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

545

564

safer_gnutls_strerror(ret));

546

565

goto globalfail;

547

566

}

548

567

549

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

568

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

550

569

551

570

return 0;

552

571

553

572

globalfail:

554

573

555

gnutls_certificate_free_credentials(mc.cred);

574

gnutls_certificate_free_credentials(mc->cred);

556

575

gnutls_global_deinit();

557

gnutls_dh_params_deinit(mc.dh_params);

576

gnutls_dh_params_deinit(mc->dh_params);

558

577

return -1;

559

578

}

560

579

561

static int init_gnutls_session(gnutls_session_t *session){

580

__attribute__((nonnull, warn_unused_result))

581

static int init_gnutls_session(gnutls_session_t *session,

582

mandos_context *mc){

562

583

int ret;

563

584

/* GnuTLS session creation */

564

585

do {

576

597

{

577

598

const char *err;

578

599

do {

579

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

600

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

580

601

if(quit_now){

581

602

gnutls_deinit(*session);

582

603

return -1;

593

614

594

615

do {

595

616

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

596

mc.cred);

617

mc->cred);

597

618

if(quit_now){

598

619

gnutls_deinit(*session);

599

620

return -1;

609

630

/* ignore client certificate if any. */

610

631

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

611

632

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

633

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

613

634

614

635

return 0;

615

636

}

619

640

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

620

641

621

642

/* Called when a Mandos server is found */

622

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

643

__attribute__((nonnull, warn_unused_result))

644

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

623

645

AvahiIfIndex if_index,

624

int af){

646

int af, mandos_context *mc){

625

647

int ret, tcp_sd = -1;

626

648

ssize_t sret;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

649

struct sockaddr_storage to;

631

650

char *buffer = NULL;

632

651

char *decrypted_buffer = NULL;

633

652

size_t buffer_length = 0;

657

676

return -1;

658

677

}

659

678

660

ret = init_gnutls_session(&session);

679

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

680

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

681

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

682

bool match = false;

683

{

684

char *interface = NULL;

685

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

686

interface))){

687

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

688

match = true;

689

break;

690

}

691

}

692

}

693

if(not match){

694

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

695

connect to the server */

696

if(debug){

697

char interface[IF_NAMESIZE];

698

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

699

perror_plus("if_indextoname");

700

} else {

701

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

702

" \"%s\"\n",

703

if_indextoname((unsigned int)if_index,

704

interface));

705

}

706

}

707

return -1;

708

}

709

}

710

711

ret = init_gnutls_session(&session, mc);

661

712

if(ret != 0){

662

713

return -1;

663

714

}

664

715

665

716

if(debug){

666

717

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

667

PRIu16 "\n", ip, port);

718

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

668

719

}

669

720

670

721

tcp_sd = socket(pf, SOCK_STREAM, 0);

682

733

683

734

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

684

735

if(af == AF_INET6){

685

to.in6.sin6_family = (sa_family_t)af;

686

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

736

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

737

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

687

738

} else { /* IPv4 */

688

to.in.sin_family = (sa_family_t)af;

689

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

739

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

740

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

690

741

}

691

742

if(ret < 0 ){

692

743

int e = errno;

701

752

goto mandos_end;

702

753

}

703

754

if(af == AF_INET6){

704

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

705

-Wconversion and

706

-Wunreachable-code */

707

708

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

709

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

710

-Wunreachable-code*/

755

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

756

if(IN6_IS_ADDR_LINKLOCAL

757

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

711

758

if(if_index == AVAHI_IF_UNSPEC){

712

759

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

713

760

" incomplete without a network interface\n");

715

762

goto mandos_end;

716

763

}

717

764

/* Set the network interface number as scope */

718

to.in6.sin6_scope_id = (uint32_t)if_index;

765

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

719

766

}

720

767

} else {

721

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

722

-Wconversion and

723

-Wunreachable-code */

768

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

724

769

}

725

770

726

771

if(quit_now){

734

779

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

735

780

perror_plus("if_indextoname");

736

781

} else {

737

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

738

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

782

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

783

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

739

784

}

740

785

} else {

741

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

742

ip, port);

786

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

787

ip, (uintmax_t)port);

743

788

}

744

789

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

745

790

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

746

const char *pcret;

747

791

if(af == AF_INET6){

748

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

749

sizeof(addrstr));

792

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

793

sizeof(struct sockaddr_in6),

794

addrstr, sizeof(addrstr), NULL, 0,

795

NI_NUMERICHOST);

750

796

} else {

751

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

752

sizeof(addrstr));

797

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

798

sizeof(struct sockaddr_in),

799

addrstr, sizeof(addrstr), NULL, 0,

800

NI_NUMERICHOST);

753

801

}

754

if(pcret == NULL){

755

perror_plus("inet_ntop");

756

} else {

757

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

758

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

759

}

802

if(ret == EAI_SYSTEM){

803

perror_plus("getnameinfo");

804

} else if(ret != 0) {

805

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

806

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

807

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

760

808

}

761

809

}

762

810

766

814

}

767

815

768

816

if(af == AF_INET6){

769

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

817

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

818

sizeof(struct sockaddr_in6));

770

819

} else {

771

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

820

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

821

sizeof(struct sockaddr_in));

772

822

}

773

823

if(ret < 0){

774

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

824

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

775

825

int e = errno;

776

826

perror_plus("connect");

777

827

errno = e;

938

988

if(buffer_length > 0){

939

989

ssize_t decrypted_buffer_size;

940

990

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

941

&decrypted_buffer);

991

&decrypted_buffer, mc);

942

992

if(decrypted_buffer_size >= 0){

943

993

944

994

written = 0;

992

1042

return retval;

993

1043

}

994

1044

1045

__attribute__((nonnull))

995

1046

static void resolve_callback(AvahiSServiceResolver *r,

996

1047

AvahiIfIndex interface,

997

1048

AvahiProtocol proto,

1005

1056

AVAHI_GCC_UNUSED AvahiStringList *txt,

1006

1057

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1007

1058

flags,

1008

AVAHI_GCC_UNUSED void* userdata){

1009

assert(r);

1059

void *mc){

1060

if(r == NULL){

1061

return;

1062

}

1010

1063

1011

1064

/* Called whenever a service has been resolved successfully or

1012

1065

timed out */

1021

1074

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

1022

1075

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

1023

1076

domain,

1024

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_strerror(avahi_server_errno

1078

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

1025

1079

break;

1026

1080

1027

1081

case AVAHI_RESOLVER_FOUND:

1033

1087

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

1034

1088

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

1035

1089

}

1036

int ret = start_mandos_communication(ip, port, interface,

1037

avahi_proto_to_af(proto));

1090

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

1091

interface,

1092

avahi_proto_to_af(proto),

1093

mc);

1038

1094

if(ret == 0){

1039

avahi_simple_poll_quit(mc.simple_poll);

1095

avahi_simple_poll_quit(simple_poll);

1040

1096

} else {

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1097

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

1098

avahi_proto_to_af(proto),

1099

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

1043

1100

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

1044

1101

" list\n", name);

1045

1102

}

1058

1115

const char *domain,

1059

1116

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1060

1117

flags,

1061

AVAHI_GCC_UNUSED void* userdata){

1062

assert(b);

1118

void *mc){

1119

if(b == NULL){

1120

return;

1121

}

1063

1122

1064

1123

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

1065

1124

is removed from the LAN */

1073

1132

case AVAHI_BROWSER_FAILURE:

1074

1133

1075

1134

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

1076

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_simple_poll_quit(mc.simple_poll);

1135

avahi_strerror(avahi_server_errno

1136

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

1137

avahi_simple_poll_quit(simple_poll);

1078

1138

return;

1079

1139

1080

1140

case AVAHI_BROWSER_NEW:

1083

1143

the callback function is called the Avahi server will free the

1084

1144

resolver for us. */

1085

1145

1086

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

1087

name, type, domain, protocol, 0,

1088

resolve_callback, NULL) == NULL)

1146

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

1147

interface, protocol, name, type,

1148

domain, protocol, 0,

1149

resolve_callback, mc) == NULL)

1089

1150

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

1090

1151

" %s\n", name,

1091

avahi_strerror(avahi_server_errno(mc.server)));

1152

avahi_strerror(avahi_server_errno

1153

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

1092

1154

break;

1093

1155

1094

1156

case AVAHI_BROWSER_REMOVE:

1113

1175

signal_received = sig;

1114

1176

int old_errno = errno;

1115

1177

/* set main loop to exit */

1116

if(mc.simple_poll != NULL){

1117

avahi_simple_poll_quit(mc.simple_poll);

1178

if(simple_poll != NULL){

1179

avahi_simple_poll_quit(simple_poll);

1118

1180

}

1119

1181

errno = old_errno;

1120

1182

}

1121

1183

1184

__attribute__((nonnull, warn_unused_result))

1122

1185

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

1123

1186

int ret;

1187

error_t ret_errno;

1124

1188

1125

1189

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

1126

1190

if(s < 0){

1191

ret_errno = errno;

1127

1192

perror_plus("socket");

1193

errno = ret_errno;

1128

1194

return false;

1129

1195

}

1130

1196

strcpy(ifr->ifr_name, ifname);

1131

1197

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1132

1198

if(ret == -1){

1133

1199

if(debug){

1200

ret_errno = errno;

1134

1201

perror_plus("ioctl SIOCGIFFLAGS");

1202

errno = ret_errno;

1135

1203

}

1136

1204

return false;

1137

1205

}

1138

1206

return true;

1139

1207

}

1140

1208

1209

__attribute__((nonnull, warn_unused_result))

1141

1210

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

1142

1211

1143

1212

/* Reject the loopback device */

1185

1254

* corresponds to an acceptable network device.

1186

1255

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

1187

1256

*/

1257

__attribute__((nonnull, warn_unused_result))

1188

1258

int good_interface(const struct dirent *if_entry){

1189

1259

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

1190

1260

return 0;

1206

1276

}

1207

1277

1208

1278

/*

1209

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

1210

* corresponds to an acceptable network device which is up.

1211

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

1212

*/

1213

int up_interface(const struct dirent *if_entry){

1214

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

1215

return 0;

1216

}

1217

1218

struct ifreq ifr;

1219

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

1220

if(debug){

1221

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

1222

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

1223

}

1224

return 0;

1225

}

1226

1227

/* Reject down interfaces */

1228

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

1229

if(debug){

1230

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

1231

if_entry->d_name);

1232

}

1233

return 0;

1234

}

1235

1236

/* Reject non-running interfaces */

1237

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

1238

if(debug){

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

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

1246

return 0;

1247

}

1248

return 1;

1249

}

1250

1279

* This function determines if a network interface is up.

1280

*/

1281

__attribute__((nonnull, warn_unused_result))

1282

bool interface_is_up(const char *interface){

1283

struct ifreq ifr;

1284

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

1285

if(debug){

1286

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

1287

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

1288

}

1289

return false;

1290

}

1291

1292

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

1293

}

1294

1295

/*

1296

* This function determines if a network interface is running

1297

*/

1298

__attribute__((nonnull, warn_unused_result))

1299

bool interface_is_running(const char *interface){

1300

struct ifreq ifr;

1301

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

1302

if(debug){

1303

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

1304

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

1305

}

1306

return false;

1307

}

1308

1309

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

1310

}

1311

1312

__attribute__((nonnull, pure, warn_unused_result))

1251

1313

int notdotentries(const struct dirent *direntry){

1252

1314

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

1253

1315

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

1260

1322

}

1261

1323

1262

1324

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

1325

__attribute__((nonnull, warn_unused_result))

1263

1326

int runnable_hook(const struct dirent *direntry){

1264

1327

int ret;

1265

1328

size_t sret;

1273

1336

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

1274

1337

"abcdefghijklmnopqrstuvwxyz"

1275

1338

"0123456789"

1276

"_-");

1339

"_.-");

1277

1340

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

1278

1341

/* Contains non-allowed characters */

1279

1342

if(debug){

1283

1346

return 0;

1284

1347

}

1285

1348

1286

char *fullname = NULL;

1287

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

1288

if(ret < 0){

1289

perror_plus("asprintf");

1290

return 0;

1291

}

1292

1293

ret = stat(fullname, &st);

1349

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

1294

1350

if(ret == -1){

1295

1351

if(debug){

1296

1352

perror_plus("Could not stat hook");

1320

1376

return 1;

1321

1377

}

1322

1378

1323

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1379

__attribute__((nonnull, warn_unused_result))

1380

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1381

mandos_context *mc){

1324

1382

int ret;

1325

1383

struct timespec now;

1326

1384

struct timespec waited_time;

1327

1385

intmax_t block_time;

1328

1386

1329

1387

while(true){

1330

if(mc.current_server == NULL){

1331

if (debug){

1388

if(mc->current_server == NULL){

1389

if(debug){

1332

1390

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

1333

1391

" No timeout!\n");

1334

1392

}

1335

1393

ret = avahi_simple_poll_iterate(s, -1);

1336

1394

} else {

1337

if (debug){

1395

if(debug){

1338

1396

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

1339

1397

" it, or wait\n");

1340

1398

}

1347

1405

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

1348

1406

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

1349

1407

waited_time.tv_sec = (now.tv_sec

1350

- mc.current_server->last_seen.tv_sec);

1408

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

1351

1409

waited_time.tv_nsec = (now.tv_nsec

1352

- mc.current_server->last_seen.tv_nsec);

1410

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

1353

1411

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

1354

1412

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

1355

1413

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

1357

1415

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

1358

1416

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

1359

1417

1360

if (debug){

1418

if(debug){

1361

1419

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

1362

1420

block_time);

1363

1421

}

1364

1422

1365

1423

if(block_time <= 0){

1366

ret = start_mandos_communication(mc.current_server->ip,

1367

mc.current_server->port,

1368

mc.current_server->if_index,

1369

mc.current_server->af);

1424

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

1425

mc->current_server->port,

1426

mc->current_server->if_index,

1427

mc->current_server->af, mc);

1370

1428

if(ret == 0){

1371

avahi_simple_poll_quit(mc.simple_poll);

1429

avahi_simple_poll_quit(s);

1372

1430

return 0;

1373

1431

}

1374

1432

ret = clock_gettime(CLOCK_MONOTONIC,

1375

&mc.current_server->last_seen);

1433

&mc->current_server->last_seen);

1376

1434

if(ret == -1){

1377

1435

perror_plus("clock_gettime");

1378

1436

return -1;

1379

1437

}

1380

mc.current_server = mc.current_server->next;

1438

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

1381

1439

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

1382

1440

servers, but don't block */

1383

1441

}

1385

1443

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

1386

1444

}

1387

1445

if(ret != 0){

1388

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

1446

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

1389

1447

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

1390

1448

}

1391

1449

}

1393

1451

}

1394

1452

1395

1453

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

1454

__attribute__((warn_unused_result))

1396

1455

error_t raise_privileges(void){

1397

1456

error_t old_errno = errno;

1398

1457

error_t ret_errno = 0;

1405

1464

}

1406

1465

1407

1466

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

1467

__attribute__((warn_unused_result))

1408

1468

error_t raise_privileges_permanently(void){

1409

1469

error_t old_errno = errno;

1410

1470

error_t ret_errno = raise_privileges();

1421

1481

}

1422

1482

1423

1483

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

1484

__attribute__((warn_unused_result))

1424

1485

error_t lower_privileges(void){

1425

1486

error_t old_errno = errno;

1426

1487

error_t ret_errno = 0;

1432

1493

return ret_errno;

1433

1494

}

1434

1495

1435

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

1496

/* Lower privileges permanently */

1497

__attribute__((warn_unused_result))

1498

error_t lower_privileges_permanently(void){

1499

error_t old_errno = errno;

1500

error_t ret_errno = 0;

1501

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

1502

ret_errno = errno;

1503

perror_plus("setuid");

1504

}

1505

errno = old_errno;

1506

return ret_errno;

1507

}

1508

1509

#ifndef O_CLOEXEC

1510

/*

1511

* Based on the example in the GNU LibC manual chapter 13.13 "File

1512

* Descriptor Flags".

1513

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

1514

*/

1515

__attribute__((warn_unused_result))

1516

static int set_cloexec_flag(int fd){

1517

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

1518

/* If reading the flags failed, return error indication now. */

1519

if(ret < 0){

1520

return ret;

1521

}

1522

/* Store modified flag word in the descriptor. */

1523

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

1524

ret | FD_CLOEXEC));

1525

}

1526

#endif /* not O_CLOEXEC */

1527

1528

__attribute__((nonnull))

1529

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

1436

1530

const float delay){

1437

1531

struct dirent **direntries;

1438

struct dirent *direntry;

1439

int ret;

1440

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

1441

alphasort);

1532

if(hookdir_fd == -1){

1533

hookdir_fd = open(hookdir, O_RDONLY |

1534

#ifdef O_CLOEXEC

1535

O_CLOEXEC

1536

#else /* not O_CLOEXEC */

1537

0

1538

#endif /* not O_CLOEXEC */

1539

);

1540

if(hookdir_fd == -1){

1541

if(errno == ENOENT){

1542

if(debug){

1543

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

1544

" found\n", hookdir);

1545

}

1546

} else {

1547

perror_plus("open");

1548

}

1549

return;

1550

}

1551

#ifndef O_CLOEXEC

1552

if(set_cloexec_flag(hookdir_fd) < 0){

1553

perror_plus("set_cloexec_flag");

1554

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

1555

perror_plus("close");

1556

} else {

1557

hookdir_fd = -1;

1558

}

1559

return;

1560

}

1561

#endif /* not O_CLOEXEC */

1562

}

1563

#ifdef __GLIBC__

1564

#if __GLIBC_PREREQ(2, 15)

1565

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

1566

runnable_hook, alphasort);

1567

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

1568

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

1569

alphasort);

1570

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

1571

#else /* not __GLIBC__ */

1572

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

1573

alphasort);

1574

#endif /* not __GLIBC__ */

1442

1575

if(numhooks == -1){

1443

1576

perror_plus("scandir");

1444

} else {

1445

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

1446

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

1447

direntry = direntries[i];

1448

char *fullname = NULL;

1449

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

1450

if(ret < 0){

1577

return;

1578

}

1579

struct dirent *direntry;

1580

int ret;

1581

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

1582

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

1583

direntry = direntries[i];

1584

if(debug){

1585

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

1586

direntry->d_name);

1587

}

1588

pid_t hook_pid = fork();

1589

if(hook_pid == 0){

1590

/* Child */

1591

/* Raise privileges */

1592

if(raise_privileges_permanently() != 0){

1593

perror_plus("Failed to raise privileges");

1594

_exit(EX_NOPERM);

1595

}

1596

/* Set group */

1597

errno = 0;

1598

ret = setgid(0);

1599

if(ret == -1){

1600

perror_plus("setgid");

1601

_exit(EX_NOPERM);

1602

}

1603

/* Reset supplementary groups */

1604

errno = 0;

1605

ret = setgroups(0, NULL);

1606

if(ret == -1){

1607

perror_plus("setgroups");

1608

_exit(EX_NOPERM);

1609

}

1610

ret = dup2(devnull, STDIN_FILENO);

1611

if(ret == -1){

1612

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

1613

_exit(EX_OSERR);

1614

}

1615

ret = close(devnull);

1616

if(ret == -1){

1617

perror_plus("close");

1618

_exit(EX_OSERR);

1619

}

1620

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1621

if(ret == -1){

1622

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

1623

_exit(EX_OSERR);

1624

}

1625

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

1626

if(ret == -1){

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

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

1631

if(ret == -1){

1632

perror_plus("setenv");

1633

_exit(EX_OSERR);

1634

}

1635

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

1636

if(ret == -1){

1637

perror_plus("setenv");

1638

_exit(EX_OSERR);

1639

}

1640

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

1641

if(ret == -1){

1642

perror_plus("setenv");

1643

_exit(EX_OSERR);

1644

}

1645

char *delaystring;

1646

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

1647

if(ret == -1){

1451

1648

perror_plus("asprintf");

1452

continue;

1453

}

1454

if(debug){

1455

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

1456

direntry->d_name);

1457

}

1458

pid_t hook_pid = fork();

1459

if(hook_pid == 0){

1460

/* Child */

1461

/* Raise privileges */

1462

raise_privileges_permanently();

1463

/* Set group */

1464

errno = 0;

1465

ret = setgid(0);

1466

if(ret == -1){

1467

perror_plus("setgid");

1468

}

1469

/* Reset supplementary groups */

1470

errno = 0;

1471

ret = setgroups(0, NULL);

1472

if(ret == -1){

1473

perror_plus("setgroups");

1474

}

1475

dup2(devnull, STDIN_FILENO);

1476

close(devnull);

1477

dup2(STDERR_FILENO, STDOUT_FILENO);

1478

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

1479

if(ret == -1){

1480

perror_plus("setenv");

1481

_exit(EX_OSERR);

1482

}

1483

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

1484

if(ret == -1){

1485

perror_plus("setenv");

1486

_exit(EX_OSERR);

1487

}

1488

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

1489

if(ret == -1){

1490

perror_plus("setenv");

1491

_exit(EX_OSERR);

1492

}

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

char *delaystring;

1499

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

1500

if(ret == -1){

1501

perror_plus("asprintf");

1502

_exit(EX_OSERR);

1503

}

1504

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

1505

if(ret == -1){

1506

free(delaystring);

1507

perror_plus("setenv");

1508

_exit(EX_OSERR);

1509

}

1649

_exit(EX_OSERR);

1650

}

1651

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

1652

if(ret == -1){

1510

1653

free(delaystring);

1511

if(connect_to != NULL){

1512

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

1513

if(ret == -1){

1514

perror_plus("setenv");

1515

_exit(EX_OSERR);

1516

}

1517

}

1518

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

1519

perror_plus("execl");

1520

_exit(EXIT_FAILURE);

1521

}

1654

perror_plus("setenv");

1655

_exit(EX_OSERR);

1656

}

1657

free(delaystring);

1658

if(connect_to != NULL){

1659

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

1660

if(ret == -1){

1661

perror_plus("setenv");

1662

_exit(EX_OSERR);

1663

}

1664

}

1665

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

1666

{ direntry->d_name, NULL }, environ) == -1){

1667

perror_plus("fexecve");

1668

_exit(EXIT_FAILURE);

1669

}

1670

} else {

1671

int status;

1672

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

1673

perror_plus("waitpid");

1674

continue;

1675

}

1676

if(WIFEXITED(status)){

1677

if(WEXITSTATUS(status) != 0){

1678

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

1679

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

1680

WEXITSTATUS(status));

1681

continue;

1682

}

1683

} else if(WIFSIGNALED(status)){

1684

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

1685

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

1686

WTERMSIG(status));

1687

continue;

1522

1688

} else {

1523

int status;

1524

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

1525

perror_plus("waitpid");

1526

free(fullname);

1527

continue;

1528

}

1529

if(WIFEXITED(status)){

1530

if(WEXITSTATUS(status) != 0){

1531

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

1532

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

1533

WEXITSTATUS(status));

1534

free(fullname);

1535

continue;

1536

}

1537

} else if(WIFSIGNALED(status)){

1538

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

1539

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

1540

WTERMSIG(status));

1541

free(fullname);

1542

continue;

1543

} else {

1544

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

1545

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

1546

free(fullname);

1547

continue;

1548

}

1549

}

1550

free(fullname);

1551

if(debug){

1552

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

1553

direntry->d_name);

1554

}

1555

}

1556

close(devnull);

1557

}

1558

return true;

1689

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

1690

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

1691

continue;

1692

}

1693

}

1694

if(debug){

1695

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

1696

direntry->d_name);

1697

}

1698

}

1699

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

1700

perror_plus("close");

1701

} else {

1702

hookdir_fd = -1;

1703

}

1704

close(devnull);

1559

1705

}

1560

1706

1561

int bring_up_interface(const char *const interface,

1562

const float delay){

1563

int sd = -1;

1564

int old_errno = errno;

1565

int ret_errno = 0;

1707

__attribute__((nonnull, warn_unused_result))

1708

error_t bring_up_interface(const char *const interface,

1709

const float delay){

1710

error_t old_errno = errno;

1566

1711

int ret;

1567

1712

struct ifreq network;

1568

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1713

unsigned int if_index = if_nametoindex(interface);

1569

1714

if(if_index == 0){

1570

1715

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

1571

1716

errno = old_errno;

1577

1722

return EINTR;

1578

1723

}

1579

1724

1580

/* Re-raise priviliges */

1581

raise_privileges();

1582

1583

#ifdef __linux__

1584

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1585

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

1586

ret = klogctl(8, NULL, 5);

1587

bool restore_loglevel = true;

1588

if(ret == -1){

1589

restore_loglevel = false;

1590

perror_plus("klogctl");

1591

}

1592

#endif /* __linux__ */

1593

1594

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1595

if(sd < 0){

1596

ret_errno = errno;

1597

perror_plus("socket");

1598

#ifdef __linux__

1599

if(restore_loglevel){

1600

ret = klogctl(7, NULL, 0);

1601

if(ret == -1){

1602

perror_plus("klogctl");

1603

}

1604

}

1605

#endif /* __linux__ */

1606

/* Lower privileges */

1607

lower_privileges();

1608

errno = old_errno;

1609

return ret_errno;

1610

}

1611

strcpy(network.ifr_name, interface);

1612

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

1613

if(ret == -1){

1614

ret_errno = errno;

1615

perror_plus("ioctl SIOCGIFFLAGS");

1616

#ifdef __linux__

1617

if(restore_loglevel){

1618

ret = klogctl(7, NULL, 0);

1619

if(ret == -1){

1620

perror_plus("klogctl");

1621

}

1622

}

1623

#endif /* __linux__ */

1624

/* Lower privileges */

1625

lower_privileges();

1626

errno = old_errno;

1627

return ret_errno;

1628

}

1629

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

1630

network.ifr_flags |= IFF_UP;

1631

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

1725

if(not interface_is_up(interface)){

1726

error_t ret_errno = 0, ioctl_errno = 0;

1727

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

1728

ret_errno = errno;

1729

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

1730

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

1731

errno = old_errno;

1732

return ret_errno;

1733

}

1734

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

1735

1736

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

1737

if(sd == -1){

1738

ret_errno = errno;

1739

perror_plus("socket");

1740

errno = old_errno;

1741

return ret_errno;

1742

}

1743

1744

if(quit_now){

1745

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

1746

if(ret == -1){

1747

perror_plus("close");

1748

}

1749

errno = old_errno;

1750

return EINTR;

1751

}

1752

1753

if(debug){

1754

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

1755

interface);

1756

}

1757

1758

/* Raise privileges */

1759

ret_errno = raise_privileges();

1760

if(ret_errno != 0){

1761

perror_plus("Failed to raise privileges");

1762

}

1763

1764

#ifdef __linux__

1765

int ret_linux;

1766

bool restore_loglevel = false;

1767

if(ret_errno == 0){

1768

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1769

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

1770

ret_linux = klogctl(8, NULL, 5);

1771

if(ret_linux == -1){

1772

perror_plus("klogctl");

1773

} else {

1774

restore_loglevel = true;

1775

}

1776

}

1777

#endif /* __linux__ */

1778

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

1779

ioctl_errno = errno;

1780

#ifdef __linux__

1781

if(restore_loglevel){

1782

ret_linux = klogctl(7, NULL, 0);

1783

if(ret_linux == -1){

1784

perror_plus("klogctl");

1785

}

1786

}

1787

#endif /* __linux__ */

1788

1789

/* If raise_privileges() succeeded above */

1790

if(ret_errno == 0){

1791

/* Lower privileges */

1792

ret_errno = lower_privileges();

1793

if(ret_errno != 0){

1794

errno = ret_errno;

1795

perror_plus("Failed to lower privileges");

1796

}

1797

}

1798

1799

/* Close the socket */

1800

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

1632

1801

if(ret == -1){

1633

ret_errno = errno;

1802

perror_plus("close");

1803

}

1804

1805

if(ret_setflags == -1){

1806

errno = ioctl_errno;

1634

1807

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1635

#ifdef __linux__

1636

if(restore_loglevel){

1637

ret = klogctl(7, NULL, 0);

1638

if(ret == -1){

1639

perror_plus("klogctl");

1640

}

1641

}

1642

#endif /* __linux__ */

1643

/* Lower privileges */

1644

lower_privileges();

1645

1808

errno = old_errno;

1646

return ret_errno;

1809

return ioctl_errno;

1647

1810

}

1811

} else if(debug){

1812

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

1813

interface);

1648

1814

}

1815

1649

1816

/* Sleep checking until interface is running.

1650

1817

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

1651

1818

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

1652

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

1653

if(ret == -1){

1654

perror_plus("ioctl SIOCGIFFLAGS");

1655

} else if(network.ifr_flags & IFF_RUNNING){

1819

if(interface_is_running(interface)){

1656

1820

break;

1657

1821

}

1658

1822

struct timespec sleeptime = { .tv_nsec = 250000000 };

1661

1825

perror_plus("nanosleep");

1662

1826

}

1663

1827

}

1664

/* Close the socket */

1665

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

1666

if(ret == -1){

1667

perror_plus("close");

1828

1829

errno = old_errno;

1830

return 0;

1831

}

1832

1833

__attribute__((nonnull, warn_unused_result))

1834

error_t take_down_interface(const char *const interface){

1835

error_t old_errno = errno;

1836

struct ifreq network;

1837

unsigned int if_index = if_nametoindex(interface);

1838

if(if_index == 0){

1839

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

1840

errno = old_errno;

1841

return ENXIO;

1668

1842

}

1669

#ifdef __linux__

1670

if(restore_loglevel){

1671

/* Restores kernel loglevel to default */

1672

ret = klogctl(7, NULL, 0);

1843

if(interface_is_up(interface)){

1844

error_t ret_errno = 0, ioctl_errno = 0;

1845

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

1846

ret_errno = errno;

1847

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

1848

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

1849

errno = old_errno;

1850

return ret_errno;

1851

}

1852

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

1853

1854

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

1855

if(sd == -1){

1856

ret_errno = errno;

1857

perror_plus("socket");

1858

errno = old_errno;

1859

return ret_errno;

1860

}

1861

1862

if(debug){

1863

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

1864

interface);

1865

}

1866

1867

/* Raise privileges */

1868

ret_errno = raise_privileges();

1869

if(ret_errno != 0){

1870

perror_plus("Failed to raise privileges");

1871

}

1872

1873

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

1874

ioctl_errno = errno;

1875

1876

/* If raise_privileges() succeeded above */

1877

if(ret_errno == 0){

1878

/* Lower privileges */

1879

ret_errno = lower_privileges();

1880

if(ret_errno != 0){

1881

errno = ret_errno;

1882

perror_plus("Failed to lower privileges");

1883

}

1884

}

1885

1886

/* Close the socket */

1887

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

1673

1888

if(ret == -1){

1674

perror_plus("klogctl");

1675

}

1889

perror_plus("close");

1890

}

1891

1892

if(ret_setflags == -1){

1893

errno = ioctl_errno;

1894

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1895

errno = old_errno;

1896

return ioctl_errno;

1897

}

1898

} else if(debug){

1899

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

1900

interface);

1676

1901

}

1677

#endif /* __linux__ */

1678

/* Lower privileges */

1679

lower_privileges();

1902

1680

1903

errno = old_errno;

1681

1904

return 0;

1682

1905

}

1683

1906

1684

1907

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

1908

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

1909

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

1910

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

1911

.interfaces = NULL, .interfaces_size = 0 };

1685

1912

AvahiSServiceBrowser *sb = NULL;

1686

int error;

1913

error_t ret_errno;

1687

1914

int ret;

1688

1915

intmax_t tmpmax;

1689

1916

char *tmp;

1690

1917

int exitcode = EXIT_SUCCESS;

1691

const char *interface = "";

1692

struct ifreq network;

1693

int sd = -1;

1694

bool take_down_interface = false;

1695

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

1696

bool tempdir_created = false;

1918

char *interfaces_to_take_down = NULL;

1919

size_t interfaces_to_take_down_size = 0;

1920

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

1921

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

1922

char *tempdir = NULL;

1697

1923

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1698

1924

const char *seckey = PATHDIR "/" SECKEY;

1699

1925

const char *pubkey = PATHDIR "/" PUBKEY;

1926

char *interfaces_hooks = NULL;

1700

1927

1701

1928

bool gnutls_initialized = false;

1702

1929

bool gpgme_initialized = false;

1793

2020

connect_to = arg;

1794

2021

break;

1795

2022

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

1796

interface = arg;

2023

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

2024

arg, (int)',');

2025

if(ret_errno != 0){

2026

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

2027

}

1797

2028

break;

1798

2029

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

1799

2030

seckey = arg;

1876

2107

/* Work around Debian bug #633582:

1877

2108

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

1878

2109

1879

/* Re-raise priviliges */

1880

if(raise_privileges() == 0){

2110

/* Re-raise privileges */

2111

ret_errno = raise_privileges();

2112

if(ret_errno != 0){

2113

errno = ret_errno;

2114

perror_plus("Failed to raise privileges");

2115

} else {

1881

2116

struct stat st;

1882

2117

1883

2118

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

1923

2158

}

1924

2159

1925

2160

/* Lower privileges */

1926

errno = 0;

1927

ret = seteuid(uid);

1928

if(ret == -1){

1929

perror_plus("seteuid");

2161

ret_errno = lower_privileges();

2162

if(ret_errno != 0){

2163

errno = ret_errno;

2164

perror_plus("Failed to lower privileges");

2165

}

2166

}

2167

}

2168

2169

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

2170

{

2171

char *interface = NULL;

2172

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

2173

interface))){

2174

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

2175

and if_nametoindex(interface) == 0){

2176

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

2177

fprintf_plus(stderr, "Not using nonexisting interface"

2178

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

2179

}

2180

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

2181

interface = NULL;

1930

2182

}

1931

2183

}

1932

2184

}

1933

2185

1934

2186

/* Run network hooks */

1935

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

1936

goto end;

2187

{

2188

if(mc.interfaces != NULL){

2189

interfaces_hooks = malloc(mc.interfaces_size);

2190

if(interfaces_hooks == NULL){

2191

perror_plus("malloc");

2192

goto end;

2193

}

2194

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

2195

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

2196

}

2197

run_network_hooks("start", interfaces_hooks != NULL ?

2198

interfaces_hooks : "", delay);

1937

2199

}

1938

2200

1939

2201

if(not debug){

1940

2202

avahi_set_log_function(empty_log);

1941

2203

}

1942

2204

1943

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

1944

struct dirent **direntries;

1945

/* First look for interfaces that are up */

1946

ret = scandir(sys_class_net, &direntries, up_interface,

1947

alphasort);

1948

if(ret == 0){

1949

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

1950

free(direntries);

1951

ret = scandir(sys_class_net, &direntries, good_interface,

1952

alphasort);

1953

}

1954

if(ret >= 1){

1955

/* Pick the first interface returned */

1956

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

1957

if(debug){

1958

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

1959

}

1960

if(interface == NULL){

1961

perror_plus("malloc");

1962

free(direntries);

1963

exitcode = EXIT_FAILURE;

1964

goto end;

1965

}

1966

free(direntries);

1967

} else {

1968

free(direntries);

1969

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

1970

exitcode = EXIT_FAILURE;

1971

goto end;

1972

}

1973

}

1974

1975

2205

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

1976

2206

from the signal handler */

1977

2207

/* Initialize the pseudo-RNG for Avahi */

1978

2208

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

1979

mc.simple_poll = avahi_simple_poll_new();

1980

if(mc.simple_poll == NULL){

2209

simple_poll = avahi_simple_poll_new();

2210

if(simple_poll == NULL){

1981

2211

fprintf_plus(stderr,

1982

2212

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

1983

2213

exitcode = EX_UNAVAILABLE;

2047

2277

}

2048

2278

}

2049

2279

2050

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

2051

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

2052

ret = bring_up_interface(interface, delay);

2053

if(ret != 0){

2054

errno = ret;

2055

perror_plus("Failed to bring up interface");

2056

}

2280

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

2281

if(mc.interfaces == NULL){

2282

struct dirent **direntries;

2283

/* Look for any good interfaces */

2284

ret = scandir(sys_class_net, &direntries, good_interface,

2285

alphasort);

2286

if(ret >= 1){

2287

/* Add all found interfaces to interfaces list */

2288

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

2289

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

2290

direntries[i]->d_name);

2291

if(ret_errno != 0){

2292

errno = ret_errno;

2293

perror_plus("argz_add");

2294

continue;

2295

}

2296

if(debug){

2297

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

2298

direntries[i]->d_name);

2299

}

2300

}

2301

free(direntries);

2302

} else {

2303

free(direntries);

2304

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

2305

exitcode = EXIT_FAILURE;

2306

goto end;

2307

}

2308

}

2309

2310

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

2311

{

2312

char *interface = NULL;

2313

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

2314

interface))){

2315

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

2316

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

2317

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

2318

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

2319

interface);

2320

interface = NULL;

2321

while((interface = argz_next(mc.interfaces,

2322

mc.interfaces_size, interface))){

2323

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

2324

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

2325

interface);

2326

interface = NULL;

2327

}

2328

}

2329

break;

2330

}

2331

bool interface_was_up = interface_is_up(interface);

2332

errno = bring_up_interface(interface, delay);

2333

if(not interface_was_up){

2334

if(errno != 0){

2335

perror_plus("Failed to bring up interface");

2336

} else {

2337

errno = argz_add(&interfaces_to_take_down,

2338

&interfaces_to_take_down_size,

2339

interface);

2340

if(errno != 0){

2341

perror_plus("argz_add");

2342

}

2343

}

2344

}

2345

}

2346

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

2347

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

2348

}

2349

}

2350

2351

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

2352

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

2353

if(debug){

2354

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

2355

mc.interfaces);

2356

}

2357

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

2057

2358

}

2058

2359

2059

2360

if(quit_now){

2060

2361

goto end;

2061

2362

}

2062

2363

2063

ret = init_gnutls_global(pubkey, seckey);

2364

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

2064

2365

if(ret == -1){

2065

2366

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

2066

2367

exitcode = EX_UNAVAILABLE;

2073

2374

goto end;

2074

2375

}

2075

2376

2076

if(mkdtemp(tempdir) == NULL){

2377

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

2378

tempdir = mkdtemp(run_tempdir);

2379

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

2380

if(debug){

2381

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

2382

run_tempdir, old_tempdir);

2383

}

2384

tempdir = mkdtemp(old_tempdir);

2385

}

2386

if(tempdir == NULL){

2077

2387

perror_plus("mkdtemp");

2078

2388

goto end;

2079

2389

}

2080

tempdir_created = true;

2081

2390

2082

2391

if(quit_now){

2083

2392

goto end;

2084

2393

}

2085

2394

2086

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

2395

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

2087

2396

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

2088

2397

exitcode = EX_UNAVAILABLE;

2089

2398

goto end;

2110

2419

goto end;

2111

2420

}

2112

2421

2113

uint16_t port;

2422

in_port_t port;

2114

2423

errno = 0;

2115

2424

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

2116

2425

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

2117

or tmpmax != (uint16_t)tmpmax){

2426

or tmpmax != (in_port_t)tmpmax){

2118

2427

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

2119

2428

exitcode = EX_USAGE;

2120

2429

goto end;

2121

2430

}

2122

2431

2123

2432

if(quit_now){

2124

2433

goto end;

2125

2434

}

2126

2435

2127

port = (uint16_t)tmpmax;

2436

port = (in_port_t)tmpmax;

2128

2437

*address = '\0';

2129

2438

/* Colon in address indicates IPv6 */

2130

2439

int af;

2146

2455

}

2147

2456

2148

2457

while(not quit_now){

2149

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

2458

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

2459

&mc);

2150

2460

if(quit_now or ret == 0){

2151

2461

break;

2152

2462

}

2154

2464

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

2155

2465

(int)retry_interval);

2156

2466

}

2157

sleep((int)retry_interval);

2467

sleep((unsigned int)retry_interval);

2158

2468

}

2159

2469

2160

if (not quit_now){

2470

if(not quit_now){

2161

2471

exitcode = EXIT_SUCCESS;

2162

2472

}

2163

2473

2178

2488

config.publish_domain = 0;

2179

2489

2180

2490

/* Allocate a new server */

2181

mc.server = avahi_server_new(avahi_simple_poll_get

2182

(mc.simple_poll), &config, NULL,

2183

NULL, &error);

2491

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2492

&config, NULL, NULL, &ret_errno);

2184

2493

2185

2494

/* Free the Avahi configuration data */

2186

2495

avahi_server_config_free(&config);

2189

2498

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

2190

2499

if(mc.server == NULL){

2191

2500

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

2192

avahi_strerror(error));

2501

avahi_strerror(ret_errno));

2193

2502

exitcode = EX_UNAVAILABLE;

2194

2503

goto end;

2195

2504

}

2201

2510

/* Create the Avahi service browser */

2202

2511

sb = avahi_s_service_browser_new(mc.server, if_index,

2203

2512

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2204

NULL, 0, browse_callback, NULL);

2513

NULL, 0, browse_callback,

2514

(void *)&mc);

2205

2515

if(sb == NULL){

2206

2516

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

2207

2517

avahi_strerror(avahi_server_errno(mc.server)));

2218

2528

if(debug){

2219

2529

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

2220

2530

}

2221

2222

ret = avahi_loop_with_timeout(mc.simple_poll,

2223

(int)(retry_interval * 1000));

2531

2532

ret = avahi_loop_with_timeout(simple_poll,

2533

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

2224

2534

if(debug){

2225

2535

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

2226

2536

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

2233

2543

}

2234

2544

2235

2545

/* Cleanup things */

2546

free(mc.interfaces);

2547

2236

2548

if(sb != NULL)

2237

2549

avahi_s_service_browser_free(sb);

2238

2550

2239

2551

if(mc.server != NULL)

2240

2552

avahi_server_free(mc.server);

2241

2553

2242

if(mc.simple_poll != NULL)

2243

avahi_simple_poll_free(mc.simple_poll);

2554

if(simple_poll != NULL)

2555

avahi_simple_poll_free(simple_poll);

2244

2556

2245

2557

if(gnutls_initialized){

2246

2558

gnutls_certificate_free_credentials(mc.cred);

2263

2575

}

2264

2576

}

2265

2577

2266

/* Run network hooks */

2267

run_network_hooks("stop", interface, delay);

2268

2269

/* Re-raise priviliges */

2578

/* Re-raise privileges */

2270

2579

{

2271

raise_privileges();

2580

ret_errno = raise_privileges();

2581

if(ret_errno != 0){

2582

perror_plus("Failed to raise privileges");

2583

} else {

2584

2585

/* Run network hooks */

2586

run_network_hooks("stop", interfaces_hooks != NULL ?

2587

interfaces_hooks : "", delay);

2588

2589

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

2590

{

2591

char *interface = NULL;

2592

while((interface=argz_next(interfaces_to_take_down,

2593

interfaces_to_take_down_size,

2594

interface))){

2595

ret_errno = take_down_interface(interface);

2596

if(ret_errno != 0){

2597

errno = ret_errno;

2598

perror_plus("Failed to take down interface");

2599

}

2600

}

2601

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

2602

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

2603

" down\n");

2604

}

2605

}

2606

}

2272

2607

2273

/* Take down the network interface */

2274

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

2275

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

2276

if(ret == -1){

2277

perror_plus("ioctl SIOCGIFFLAGS");

2278

} else if(network.ifr_flags & IFF_UP){

2279

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

2280

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

2281

if(ret == -1){

2282

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2283

}

2284

}

2285

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

2286

if(ret == -1){

2287

perror_plus("close");

2288

}

2608

ret_errno = lower_privileges_permanently();

2609

if(ret_errno != 0){

2610

perror_plus("Failed to lower privileges permanently");

2289

2611

}

2290

2612

}

2291

/* Lower privileges permanently */

2292

errno = 0;

2293

ret = setuid(uid);

2294

if(ret == -1){

2295

perror_plus("setuid");

2296

}

2613

2614

free(interfaces_to_take_down);

2615

free(interfaces_hooks);

2297

2616

2298

2617

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

2299

if(tempdir_created){

2618

if(tempdir != NULL){

2300

2619

struct dirent **direntries = NULL;

2301

2620

struct dirent *direntry = NULL;

2302

2621

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

2303

2622

alphasort);

2304

if (numentries > 0){

2623

if(numentries > 0){

2305

2624

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

2306

2625

direntry = direntries[i];

2307

2626

char *fullname = NULL;

2319

2638

free(fullname);

2320

2639

}

2321

2640

}

2322

2641

2323

2642

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

2324

2643

free(direntries);

2325

if (numentries == -1){

2644

if(numentries == -1){

2326

2645

perror_plus("scandir");

2327

2646

}

2328

2647

ret = rmdir(tempdir);