/mandos/trunk : revision 687

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

41

42

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

43

stdout, ferror(), remove() */

44

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

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,

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() */

65

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

66

program_invocation_short_name */

67

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

73

*/

74

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

75

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

76

setgid(), pause() */

77

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

76

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

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,

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

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() */

90

97

91

98

#ifdef __linux__

92

99

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

134

141

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

135

142

char *connect_to = NULL;

136

143

const char *hookdir = HOOKDIR;

144

uid_t uid = 65534;

145

gid_t gid = 65534;

137

146

138

147

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

139

148

typedef struct server{

140

149

const char *ip;

141

uint16_t port;

150

in_port_t port;

142

151

AvahiIfIndex if_index;

143

152

int af;

144

153

struct timespec last_seen;

148

157

149

158

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

150

159

typedef struct {

151

AvahiSimplePoll *simple_poll;

152

160

AvahiServer *server;

153

161

gnutls_certificate_credentials_t cred;

154

162

unsigned int dh_bits;

156

164

const char *priority;

157

165

gpgme_ctx_t ctx;

158

166

server *current_server;

167

char *interfaces;

168

size_t interfaces_size;

159

169

} mandos_context;

160

170

161

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

162

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

163

.dh_bits = 1024, .priority = "SECURE256"

164

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

165

.current_server = NULL };

171

/* global so signal handler can reach it*/

172

AvahiSimplePoll *simple_poll;

166

173

167

174

sig_atomic_t quit_now = 0;

168

175

int signal_received = 0;

169

176

170

177

/* Function to use when printing errors */

171

178

void perror_plus(const char *print_text){

179

int e = errno;

172

180

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

173

181

program_invocation_short_name);

182

errno = e;

174

183

perror(print_text);

175

184

}

176

185

186

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

177

187

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

178

188

va_list ap;

179

189

va_start (ap, format);

180

190

181

191

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

182

192

program_invocation_short_name));

183

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

193

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

184

194

}

185

195

186

196

/*

188

198

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

189

199

* "buffer_length" is how much is already used.

190

200

*/

201

__attribute__((nonnull, warn_unused_result))

191

202

size_t incbuffer(char **buffer, size_t buffer_length,

192

203

size_t buffer_capacity){

193

204

if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

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

195

if(buffer == NULL){

205

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

206

if(new_buf == NULL){

207

int old_errno = errno;

208

free(*buffer);

209

errno = old_errno;

210

*buffer = NULL;

196

211

return 0;

197

212

}

213

*buffer = new_buf;

198

214

buffer_capacity += BUFFER_SIZE;

199

215

}

200

216

return buffer_capacity;

201

217

}

202

218

203

219

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

204

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

205

int af){

220

__attribute__((nonnull, warn_unused_result))

221

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

222

int af, server **current_server){

206

223

int ret;

207

224

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

208

225

if(new_server == NULL){

209

226

perror_plus("malloc");

210

return -1;

227

return false;

211

228

}

212

229

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

213

230

.port = port,

215

232

.af = af };

216

233

if(new_server->ip == NULL){

217

234

perror_plus("strdup");

218

return -1;

235

return false;

236

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

219

241

}

220

242

/* Special case of first server */

221

if (mc.current_server == NULL){

243

if(*current_server == NULL){

222

244

new_server->next = new_server;

223

245

new_server->prev = new_server;

224

mc.current_server = new_server;

225

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

246

*current_server = new_server;

226

247

} else {

227

new_server->next = mc.current_server;

228

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

248

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

249

new_server->next = *current_server;

250

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

229

251

new_server->prev->next = new_server;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

252

(*current_server)->prev = new_server;

253

}

254

return true;

238

255

}

239

256

240

257

/*

241

258

* Initialize GPGME.

242

259

*/

243

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

244

const char *tempdir){

260

__attribute__((nonnull, warn_unused_result))

261

static bool init_gpgme(const char * const seckey,

262

const char * const pubkey,

263

const char * const tempdir,

264

mandos_context *mc){

245

265

gpgme_error_t rc;

246

266

gpgme_engine_info_t engine_info;

247

267

248

249

268

/*

250

269

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

251

270

*/

252

bool import_key(const char *filename){

271

bool import_key(const char * const filename){

253

272

int ret;

254

273

int fd;

255

274

gpgme_data_t pgp_data;

267

286

return false;

268

287

}

269

288

270

rc = gpgme_op_import(mc.ctx, pgp_data);

289

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

271

290

if(rc != GPG_ERR_NO_ERROR){

272

291

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

273

292

gpgme_strsource(rc), gpgme_strerror(rc));

317

336

}

318

337

319

338

/* Create new GPGME "context" */

320

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

339

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

321

340

if(rc != GPG_ERR_NO_ERROR){

322

341

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

323

342

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

336

355

* Decrypt OpenPGP data.

337

356

* Returns -1 on error

338

357

*/

358

__attribute__((nonnull, warn_unused_result))

339

359

static ssize_t pgp_packet_decrypt(const char *cryptotext,

340

360

size_t crypto_size,

341

char **plaintext){

361

char **plaintext,

362

mandos_context *mc){

342

363

gpgme_data_t dh_crypto, dh_plain;

343

364

gpgme_error_t rc;

344

365

ssize_t ret;

370

391

371

392

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

372

393

data buffer */

373

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

394

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

374

395

if(rc != GPG_ERR_NO_ERROR){

375

396

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

376

397

gpgme_strsource(rc), gpgme_strerror(rc));

377

398

plaintext_length = -1;

378

399

if(debug){

379

400

gpgme_decrypt_result_t result;

380

result = gpgme_op_decrypt_result(mc.ctx);

401

result = gpgme_op_decrypt_result(mc->ctx);

381

402

if(result == NULL){

382

403

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

383

404

} else {

460

481

return plaintext_length;

461

482

}

462

483

463

static const char * safer_gnutls_strerror(int value){

464

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

465

-Wunreachable-code */

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

486

const char *ret = gnutls_strerror(value);

466

487

if(ret == NULL)

467

488

ret = "(unknown)";

468

489

return ret;

469

490

}

470

491

471

492

/* GnuTLS log function callback */

493

__attribute__((nonnull))

472

494

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

473

495

const char* string){

474

496

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

475

497

}

476

498

499

__attribute__((nonnull, warn_unused_result))

477

500

static int init_gnutls_global(const char *pubkeyfilename,

478

const char *seckeyfilename){

501

const char *seckeyfilename,

502

mandos_context *mc){

479

503

int ret;

480

504

481

505

if(debug){

498

522

}

499

523

500

524

/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

525

ret = gnutls_certificate_allocate_credentials(&mc->cred);

502

526

if(ret != GNUTLS_E_SUCCESS){

503

527

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

504

528

safer_gnutls_strerror(ret));

514

538

}

515

539

516

540

ret = gnutls_certificate_set_openpgp_key_file

517

(mc.cred, pubkeyfilename, seckeyfilename,

541

(mc->cred, pubkeyfilename, seckeyfilename,

518

542

GNUTLS_OPENPGP_FMT_BASE64);

519

543

if(ret != GNUTLS_E_SUCCESS){

520

544

fprintf_plus(stderr,

526

550

}

527

551

528

552

/* GnuTLS server initialization */

529

ret = gnutls_dh_params_init(&mc.dh_params);

553

ret = gnutls_dh_params_init(&mc->dh_params);

530

554

if(ret != GNUTLS_E_SUCCESS){

531

555

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

556

" initialization: %s\n",

533

557

safer_gnutls_strerror(ret));

534

558

goto globalfail;

535

559

}

536

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

560

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

537

561

if(ret != GNUTLS_E_SUCCESS){

538

562

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

539

563

safer_gnutls_strerror(ret));

540

564

goto globalfail;

541

565

}

542

566

543

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

567

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

544

568

545

569

return 0;

546

570

547

571

globalfail:

548

572

549

gnutls_certificate_free_credentials(mc.cred);

573

gnutls_certificate_free_credentials(mc->cred);

550

574

gnutls_global_deinit();

551

gnutls_dh_params_deinit(mc.dh_params);

575

gnutls_dh_params_deinit(mc->dh_params);

552

576

return -1;

553

577

}

554

578

555

static int init_gnutls_session(gnutls_session_t *session){

579

__attribute__((nonnull, warn_unused_result))

580

static int init_gnutls_session(gnutls_session_t *session,

581

mandos_context *mc){

556

582

int ret;

557

583

/* GnuTLS session creation */

558

584

do {

570

596

{

571

597

const char *err;

572

598

do {

573

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

599

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

574

600

if(quit_now){

575

601

gnutls_deinit(*session);

576

602

return -1;

587

613

588

614

do {

589

615

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

590

mc.cred);

616

mc->cred);

591

617

if(quit_now){

592

618

gnutls_deinit(*session);

593

619

return -1;

603

629

/* ignore client certificate if any. */

604

630

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

605

631

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

607

633

608

634

return 0;

609

635

}

613

639

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

614

640

615

641

/* Called when a Mandos server is found */

616

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

642

__attribute__((nonnull, warn_unused_result))

643

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

617

644

AvahiIfIndex if_index,

618

int af){

645

int af, mandos_context *mc){

619

646

int ret, tcp_sd = -1;

620

647

ssize_t sret;

621

union {

622

struct sockaddr_in in;

623

struct sockaddr_in6 in6;

624

} to;

648

struct sockaddr_storage to;

625

649

char *buffer = NULL;

626

650

char *decrypted_buffer = NULL;

627

651

size_t buffer_length = 0;

651

675

return -1;

652

676

}

653

677

654

ret = init_gnutls_session(&session);

678

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

679

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

680

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

681

bool match = false;

682

{

683

char *interface = NULL;

684

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

685

interface))){

686

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

687

match = true;

688

break;

689

}

690

}

691

}

692

if(not match){

693

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

694

connect to the server */

695

if(debug){

696

char interface[IF_NAMESIZE];

697

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

698

perror_plus("if_indextoname");

699

} else {

700

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

701

" \"%s\"\n",

702

if_indextoname((unsigned int)if_index,

703

interface));

704

}

705

}

706

return -1;

707

}

708

}

709

710

ret = init_gnutls_session(&session, mc);

655

711

if(ret != 0){

656

712

return -1;

657

713

}

658

714

659

715

if(debug){

660

716

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

661

PRIu16 "\n", ip, port);

717

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

662

718

}

663

719

664

720

tcp_sd = socket(pf, SOCK_STREAM, 0);

676

732

677

733

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

678

734

if(af == AF_INET6){

679

to.in6.sin6_family = (sa_family_t)af;

680

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

735

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

736

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

681

737

} else { /* IPv4 */

682

to.in.sin_family = (sa_family_t)af;

683

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

738

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

739

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

684

740

}

685

741

if(ret < 0 ){

686

742

int e = errno;

695

751

goto mandos_end;

696

752

}

697

753

if(af == AF_INET6){

698

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

699

-Wconversion and

700

-Wunreachable-code */

701

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

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

704

-Wunreachable-code*/

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

705

757

if(if_index == AVAHI_IF_UNSPEC){

706

758

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

707

759

" incomplete without a network interface\n");

709

761

goto mandos_end;

710

762

}

711

763

/* Set the network interface number as scope */

712

to.in6.sin6_scope_id = (uint32_t)if_index;

764

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

713

765

}

714

766

} else {

715

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

716

-Wconversion and

717

-Wunreachable-code */

767

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

718

768

}

719

769

720

770

if(quit_now){

728

778

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

729

779

perror_plus("if_indextoname");

730

780

} else {

731

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

732

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

781

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

782

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

733

783

}

734

784

} else {

735

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

736

ip, port);

785

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

786

ip, (uintmax_t)port);

737

787

}

738

788

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

789

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

740

const char *pcret;

741

790

if(af == AF_INET6){

742

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

743

sizeof(addrstr));

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

744

795

} else {

745

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

746

sizeof(addrstr));

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

747

800

}

748

if(pcret == NULL){

749

perror_plus("inet_ntop");

750

} else {

751

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

752

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

753

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

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

805

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

806

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

754

807

}

755

808

}

756

809

760

813

}

761

814

762

815

if(af == AF_INET6){

763

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

816

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

817

sizeof(struct sockaddr_in6));

764

818

} else {

765

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

819

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

820

sizeof(struct sockaddr_in));

766

821

}

767

822

if(ret < 0){

768

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

823

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

769

824

int e = errno;

770

825

perror_plus("connect");

771

826

errno = e;

817

872

goto mandos_end;

818

873

}

819

874

820

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

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

875

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

876

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

877

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

878

gnutls_transport_set_ptr(session,

879

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

822

880

823

881

if(quit_now){

824

882

errno = EINTR;

929

987

if(buffer_length > 0){

930

988

ssize_t decrypted_buffer_size;

931

989

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

932

&decrypted_buffer);

990

&decrypted_buffer, mc);

933

991

if(decrypted_buffer_size >= 0){

934

992

935

993

written = 0;

983

1041

return retval;

984

1042

}

985

1043

1044

__attribute__((nonnull))

986

1045

static void resolve_callback(AvahiSServiceResolver *r,

987

1046

AvahiIfIndex interface,

988

1047

AvahiProtocol proto,

996

1055

AVAHI_GCC_UNUSED AvahiStringList *txt,

997

1056

AVAHI_GCC_UNUSED AvahiLookupResultFlags

998

1057

flags,

999

AVAHI_GCC_UNUSED void* userdata){

1000

assert(r);

1058

void *mc){

1059

if(r == NULL){

1060

return;

1061

}

1001

1062

1002

1063

/* Called whenever a service has been resolved successfully or

1003

1064

timed out */

1012

1073

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

1013

1074

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

1014

1075

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

1076

avahi_strerror(avahi_server_errno

1077

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

1016

1078

break;

1017

1079

1018

1080

case AVAHI_RESOLVER_FOUND:

1024

1086

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

1025

1087

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

1026

1088

}

1027

int ret = start_mandos_communication(ip, port, interface,

1028

avahi_proto_to_af(proto));

1089

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

1090

interface,

1091

avahi_proto_to_af(proto),

1092

mc);

1029

1093

if(ret == 0){

1030

avahi_simple_poll_quit(mc.simple_poll);

1094

avahi_simple_poll_quit(simple_poll);

1031

1095

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1096

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

1097

avahi_proto_to_af(proto),

1098

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

1099

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

1100

" list\n", name);

1101

}

1034

1102

}

1035

1103

}

1036

1104

}

1046

1114

const char *domain,

1047

1115

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1048

1116

flags,

1049

AVAHI_GCC_UNUSED void* userdata){

1050

assert(b);

1117

void *mc){

1118

if(b == NULL){

1119

return;

1120

}

1051

1121

1052

1122

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

1053

1123

is removed from the LAN */

1061

1131

case AVAHI_BROWSER_FAILURE:

1062

1132

1063

1133

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1065

avahi_simple_poll_quit(mc.simple_poll);

1134

avahi_strerror(avahi_server_errno

1135

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

1136

avahi_simple_poll_quit(simple_poll);

1066

1137

return;

1067

1138

1068

1139

case AVAHI_BROWSER_NEW:

1071

1142

the callback function is called the Avahi server will free the

1072

1143

resolver for us. */

1073

1144

1074

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

1075

name, type, domain, protocol, 0,

1076

resolve_callback, NULL) == NULL)

1145

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

1146

interface, protocol, name, type,

1147

domain, protocol, 0,

1148

resolve_callback, mc) == NULL)

1077

1149

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

1078

1150

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1151

avahi_strerror(avahi_server_errno

1152

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

1080

1153

break;

1081

1154

1082

1155

case AVAHI_BROWSER_REMOVE:

1101

1174

signal_received = sig;

1102

1175

int old_errno = errno;

1103

1176

/* set main loop to exit */

1104

if(mc.simple_poll != NULL){

1105

avahi_simple_poll_quit(mc.simple_poll);

1177

if(simple_poll != NULL){

1178

avahi_simple_poll_quit(simple_poll);

1106

1179

}

1107

1180

errno = old_errno;

1108

1181

}

1109

1182

1183

__attribute__((nonnull, warn_unused_result))

1110

1184

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

1111

1185

int ret;

1186

error_t ret_errno;

1112

1187

1113

1188

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

1114

1189

if(s < 0){

1190

ret_errno = errno;

1115

1191

perror_plus("socket");

1192

errno = ret_errno;

1116

1193

return false;

1117

1194

}

1118

1195

strcpy(ifr->ifr_name, ifname);

1119

1196

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

1197

if(ret == -1){

1121

1198

if(debug){

1199

ret_errno = errno;

1122

1200

perror_plus("ioctl SIOCGIFFLAGS");

1201

errno = ret_errno;

1123

1202

}

1124

1203

return false;

1125

1204

}

1126

1205

return true;

1127

1206

}

1128

1207

1208

__attribute__((nonnull, warn_unused_result))

1129

1209

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

1130

1210

1131

1211

/* Reject the loopback device */

1173

1253

* corresponds to an acceptable network device.

1174

1254

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

1175

1255

*/

1256

__attribute__((nonnull, warn_unused_result))

1176

1257

int good_interface(const struct dirent *if_entry){

1177

1258

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

1178

1259

return 0;

1194

1275

}

1195

1276

1196

1277

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

1237

}

1238

1278

* This function determines if a network interface is up.

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

bool interface_is_up(const char *interface){

1282

struct ifreq ifr;

1283

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

1284

if(debug){

1285

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

1286

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

1287

}

1288

return false;

1289

}

1290

1291

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

1292

}

1293

1294

/*

1295

* This function determines if a network interface is running

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

bool interface_is_running(const char *interface){

1299

struct ifreq ifr;

1300

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

1301

if(debug){

1302

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

1303

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

1304

}

1305

return false;

1306

}

1307

1308

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

1309

}

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1239

1312

int notdotentries(const struct dirent *direntry){

1240

1313

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

1241

1314

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

1248

1321

}

1249

1322

1250

1323

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

1324

__attribute__((nonnull, warn_unused_result))

1251

1325

int runnable_hook(const struct dirent *direntry){

1252

1326

int ret;

1253

1327

size_t sret;

1301

1375

}

1302

1376

return 0;

1303

1377

}

1378

if(debug){

1379

fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",

1380

direntry->d_name);

1381

}

1304

1382

return 1;

1305

1383

}

1306

1384

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1385

__attribute__((nonnull, warn_unused_result))

1386

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1387

mandos_context *mc){

1308

1388

int ret;

1309

1389

struct timespec now;

1310

1390

struct timespec waited_time;

1311

1391

intmax_t block_time;

1312

1392

1313

1393

while(true){

1314

if(mc.current_server == NULL){

1315

if (debug){

1394

if(mc->current_server == NULL){

1395

if(debug){

1316

1396

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

1317

1397

" No timeout!\n");

1318

1398

}

1319

1399

ret = avahi_simple_poll_iterate(s, -1);

1320

1400

} else {

1321

if (debug){

1401

if(debug){

1322

1402

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

1323

1403

" it, or wait\n");

1324

1404

}

1331

1411

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

1332

1412

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

1333

1413

waited_time.tv_sec = (now.tv_sec

1334

- mc.current_server->last_seen.tv_sec);

1414

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

1335

1415

waited_time.tv_nsec = (now.tv_nsec

1336

- mc.current_server->last_seen.tv_nsec);

1416

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

1337

1417

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

1338

1418

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

1339

1419

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

1341

1421

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

1342

1422

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

1343

1423

1344

if (debug){

1424

if(debug){

1345

1425

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

1346

1426

block_time);

1347

1427

}

1348

1428

1349

1429

if(block_time <= 0){

1350

ret = start_mandos_communication(mc.current_server->ip,

1351

mc.current_server->port,

1352

mc.current_server->if_index,

1353

mc.current_server->af);

1430

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

1431

mc->current_server->port,

1432

mc->current_server->if_index,

1433

mc->current_server->af, mc);

1354

1434

if(ret == 0){

1355

avahi_simple_poll_quit(mc.simple_poll);

1435

avahi_simple_poll_quit(s);

1356

1436

return 0;

1357

1437

}

1358

1438

ret = clock_gettime(CLOCK_MONOTONIC,

1359

&mc.current_server->last_seen);

1439

&mc->current_server->last_seen);

1360

1440

if(ret == -1){

1361

1441

perror_plus("clock_gettime");

1362

1442

return -1;

1363

1443

}

1364

mc.current_server = mc.current_server->next;

1444

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

1365

1445

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

1366

1446

servers, but don't block */

1367

1447

}

1369

1449

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

1370

1450

}

1371

1451

if(ret != 0){

1372

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

1452

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

1373

1453

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

1374

1454

}

1375

1455

}

1376

1456

}

1377

1457

}

1378

1458

1379

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

1459

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

1460

__attribute__((warn_unused_result))

1461

error_t raise_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

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

1473

__attribute__((warn_unused_result))

1474

error_t raise_privileges_permanently(void){

1475

error_t old_errno = errno;

1476

error_t ret_errno = raise_privileges();

1477

if(ret_errno != 0){

1478

errno = old_errno;

1479

return ret_errno;

1480

}

1481

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

1482

ret_errno = errno;

1483

perror_plus("seteuid");

1484

}

1485

errno = old_errno;

1486

return ret_errno;

1487

}

1488

1489

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

1490

__attribute__((warn_unused_result))

1491

error_t lower_privileges(void){

1492

error_t old_errno = errno;

1493

error_t ret_errno = 0;

1494

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

1495

ret_errno = errno;

1496

perror_plus("seteuid");

1497

}

1498

errno = old_errno;

1499

return ret_errno;

1500

}

1501

1502

/* Lower privileges permanently */

1503

__attribute__((warn_unused_result))

1504

error_t lower_privileges_permanently(void){

1505

error_t old_errno = errno;

1506

error_t ret_errno = 0;

1507

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

1508

ret_errno = errno;

1509

perror_plus("setuid");

1510

}

1511

errno = old_errno;

1512

return ret_errno;

1513

}

1514

1515

__attribute__((nonnull))

1516

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

1380

1517

const float delay){

1381

1518

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

1519

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

1385

1520

alphasort);

1386

1521

if(numhooks == -1){

1387

perror_plus("scandir");

1522

if(errno == ENOENT){

1523

if(debug){

1524

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

1525

" found\n", hookdir);

1526

}

1527

} else {

1528

perror_plus("scandir");

1529

}

1388

1530

} else {

1531

struct dirent *direntry;

1532

int ret;

1389

1533

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

1390

1534

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

1391

direntry = direntries[0];

1535

direntry = direntries[i];

1392

1536

char *fullname = NULL;

1393

1537

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

1394

1538

if(ret < 0){

1395

1539

perror_plus("asprintf");

1396

1540

continue;

1397

1541

}

1542

if(debug){

1543

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

1544

direntry->d_name);

1545

}

1398

1546

pid_t hook_pid = fork();

1399

1547

if(hook_pid == 0){

1400

1548

/* Child */

1401

dup2(devnull, STDIN_FILENO);

1402

close(devnull);

1403

dup2(STDERR_FILENO, STDOUT_FILENO);

1549

/* Raise privileges */

1550

if(raise_privileges_permanently() != 0){

1551

perror_plus("Failed to raise privileges");

1552

_exit(EX_NOPERM);

1553

}

1554

/* Set group */

1555

errno = 0;

1556

ret = setgid(0);

1557

if(ret == -1){

1558

perror_plus("setgid");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Reset supplementary groups */

1562

errno = 0;

1563

ret = setgroups(0, NULL);

1564

if(ret == -1){

1565

perror_plus("setgroups");

1566

_exit(EX_NOPERM);

1567

}

1568

ret = dup2(devnull, STDIN_FILENO);

1569

if(ret == -1){

1570

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

1571

_exit(EX_OSERR);

1572

}

1573

ret = close(devnull);

1574

if(ret == -1){

1575

perror_plus("close");

1576

_exit(EX_OSERR);

1577

}

1578

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1579

if(ret == -1){

1580

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

1581

_exit(EX_OSERR);

1582

}

1404

1583

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

1405

1584

if(ret == -1){

1406

1585

perror_plus("setenv");

1407

return false;

1586

_exit(EX_OSERR);

1408

1587

}

1409

1588

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

1410

1589

if(ret == -1){

1411

1590

perror_plus("setenv");

1412

return false;

1591

_exit(EX_OSERR);

1413

1592

}

1414

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

1593

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

1415

1594

if(ret == -1){

1416

1595

perror_plus("setenv");

1417

return false;

1596

_exit(EX_OSERR);

1418

1597

}

1419

1598

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

1420

1599

if(ret == -1){

1421

1600

perror_plus("setenv");

1422

return false;

1601

_exit(EX_OSERR);

1423

1602

}

1424

1603

char *delaystring;

1425

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

1604

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

1426

1605

if(ret == -1){

1427

1606

perror_plus("asprintf");

1428

return false;

1607

_exit(EX_OSERR);

1429

1608

}

1430

1609

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

1431

1610

if(ret == -1){

1432

1611

free(delaystring);

1433

1612

perror_plus("setenv");

1434

return false;

1613

_exit(EX_OSERR);

1435

1614

}

1436

1615

free(delaystring);

1437

ret = execl(fullname, direntry->d_name, mode, NULL);

1438

perror_plus("execl");

1616

if(connect_to != NULL){

1617

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

1618

if(ret == -1){

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

}

1623

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

1624

perror_plus("execl");

1625

_exit(EXIT_FAILURE);

1626

}

1439

1627

} else {

1440

1628

int status;

1441

1629

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

1465

1653

}

1466

1654

}

1467

1655

free(fullname);

1468

if(quit_now){

1469

break;

1656

if(debug){

1657

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

1658

direntry->d_name);

1470

1659

}

1471

1660

}

1472

1661

close(devnull);

1473

1662

}

1474

return true;

1663

}

1664

1665

__attribute__((nonnull, warn_unused_result))

1666

error_t bring_up_interface(const char *const interface,

1667

const float delay){

1668

error_t old_errno = errno;

1669

int ret;

1670

struct ifreq network;

1671

unsigned int if_index = if_nametoindex(interface);

1672

if(if_index == 0){

1673

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

1674

errno = old_errno;

1675

return ENXIO;

1676

}

1677

1678

if(quit_now){

1679

errno = old_errno;

1680

return EINTR;

1681

}

1682

1683

if(not interface_is_up(interface)){

1684

error_t ret_errno = 0, ioctl_errno = 0;

1685

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

1686

ret_errno = errno;

1687

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

1688

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

1689

errno = old_errno;

1690

return ret_errno;

1691

}

1692

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

1693

1694

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

1695

if(sd == -1){

1696

ret_errno = errno;

1697

perror_plus("socket");

1698

errno = old_errno;

1699

return ret_errno;

1700

}

1701

1702

if(quit_now){

1703

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

1704

if(ret == -1){

1705

perror_plus("close");

1706

}

1707

errno = old_errno;

1708

return EINTR;

1709

}

1710

1711

if(debug){

1712

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

1713

interface);

1714

}

1715

1716

/* Raise privileges */

1717

ret_errno = raise_privileges();

1718

if(ret_errno != 0){

1719

perror_plus("Failed to raise privileges");

1720

}

1721

1722

#ifdef __linux__

1723

int ret_linux;

1724

bool restore_loglevel = false;

1725

if(ret_errno == 0){

1726

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1727

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

1728

ret_linux = klogctl(8, NULL, 5);

1729

if(ret_linux == -1){

1730

perror_plus("klogctl");

1731

} else {

1732

restore_loglevel = true;

1733

}

1734

}

1735

#endif /* __linux__ */

1736

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

1737

ioctl_errno = errno;

1738

#ifdef __linux__

1739

if(restore_loglevel){

1740

ret_linux = klogctl(7, NULL, 0);

1741

if(ret_linux == -1){

1742

perror_plus("klogctl");

1743

}

1744

}

1745

#endif /* __linux__ */

1746

1747

/* If raise_privileges() succeeded above */

1748

if(ret_errno == 0){

1749

/* Lower privileges */

1750

ret_errno = lower_privileges();

1751

if(ret_errno != 0){

1752

errno = ret_errno;

1753

perror_plus("Failed to lower privileges");

1754

}

1755

}

1756

1757

/* Close the socket */

1758

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

1759

if(ret == -1){

1760

perror_plus("close");

1761

}

1762

1763

if(ret_setflags == -1){

1764

errno = ioctl_errno;

1765

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1766

errno = old_errno;

1767

return ioctl_errno;

1768

}

1769

} else if(debug){

1770

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

1771

interface);

1772

}

1773

1774

/* Sleep checking until interface is running.

1775

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

1776

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

1777

if(interface_is_running(interface)){

1778

break;

1779

}

1780

struct timespec sleeptime = { .tv_nsec = 250000000 };

1781

ret = nanosleep(&sleeptime, NULL);

1782

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

1783

perror_plus("nanosleep");

1784

}

1785

}

1786

1787

errno = old_errno;

1788

return 0;

1789

}

1790

1791

__attribute__((nonnull, warn_unused_result))

1792

error_t take_down_interface(const char *const interface){

1793

error_t old_errno = errno;

1794

struct ifreq network;

1795

unsigned int if_index = if_nametoindex(interface);

1796

if(if_index == 0){

1797

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

1798

errno = old_errno;

1799

return ENXIO;

1800

}

1801

if(interface_is_up(interface)){

1802

error_t ret_errno = 0, ioctl_errno = 0;

1803

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

1804

ret_errno = errno;

1805

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

1806

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

1807

errno = old_errno;

1808

return ret_errno;

1809

}

1810

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

1811

1812

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

1813

if(sd == -1){

1814

ret_errno = errno;

1815

perror_plus("socket");

1816

errno = old_errno;

1817

return ret_errno;

1818

}

1819

1820

if(debug){

1821

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

1822

interface);

1823

}

1824

1825

/* Raise privileges */

1826

ret_errno = raise_privileges();

1827

if(ret_errno != 0){

1828

perror_plus("Failed to raise privileges");

1829

}

1830

1831

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

1832

ioctl_errno = errno;

1833

1834

/* If raise_privileges() succeeded above */

1835

if(ret_errno == 0){

1836

/* Lower privileges */

1837

ret_errno = lower_privileges();

1838

if(ret_errno != 0){

1839

errno = ret_errno;

1840

perror_plus("Failed to lower privileges");

1841

}

1842

}

1843

1844

/* Close the socket */

1845

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

1846

if(ret == -1){

1847

perror_plus("close");

1848

}

1849

1850

if(ret_setflags == -1){

1851

errno = ioctl_errno;

1852

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1853

errno = old_errno;

1854

return ioctl_errno;

1855

}

1856

} else if(debug){

1857

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

1858

interface);

1859

}

1860

1861

errno = old_errno;

1862

return 0;

1475

1863

}

1476

1864

1477

1865

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

1866

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

1867

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

1868

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

1869

.interfaces = NULL, .interfaces_size = 0 };

1478

1870

AvahiSServiceBrowser *sb = NULL;

1479

int error;

1871

error_t ret_errno;

1480

1872

int ret;

1481

1873

intmax_t tmpmax;

1482

1874

char *tmp;

1483

1875

int exitcode = EXIT_SUCCESS;

1484

const char *interface = "";

1485

struct ifreq network;

1486

int sd = -1;

1487

bool take_down_interface = false;

1488

uid_t uid;

1489

gid_t gid;

1490

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

1491

bool tempdir_created = false;

1876

char *interfaces_to_take_down = NULL;

1877

size_t interfaces_to_take_down_size = 0;

1878

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

1879

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

1880

char *tempdir = NULL;

1492

1881

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1493

1882

const char *seckey = PATHDIR "/" SECKEY;

1494

1883

const char *pubkey = PATHDIR "/" PUBKEY;

1884

char *interfaces_hooks = NULL;

1495

1885

1496

1886

bool gnutls_initialized = false;

1497

1887

bool gpgme_initialized = false;

1559

1949

.group = 2 },

1560

1950

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

1561

1951

.arg = "SECONDS",

1562

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

1952

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

1563

1953

.group = 2 },

1564

1954

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

1565

1955

.arg = "DIR",

1588

1978

connect_to = arg;

1589

1979

break;

1590

1980

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

1591

interface = arg;

1981

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

1982

arg, (int)',');

1983

if(ret_errno != 0){

1984

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

1985

}

1592

1986

break;

1593

1987

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

1594

1988

seckey = arg;

1637

2031

argp_state_help(state, state->out_stream,

1638

2032

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1639

2033

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

1642

2034

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

1643

2035

exit(argp_err_exit_status);

1644

2036

break;

1672

2064

{

1673

2065

/* Work around Debian bug #633582:

1674

2066

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

1675

struct stat st;

1676

1677

/* Re-raise priviliges */

1678

errno = 0;

1679

ret = seteuid(0);

1680

if(ret == -1){

1681

perror_plus("seteuid");

1682

}

1683

1684

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

1685

int seckey_fd = open(seckey, O_RDONLY);

1686

if(seckey_fd == -1){

1687

perror_plus("open");

1688

} else {

1689

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

1690

if(ret == -1){

1691

perror_plus("fstat");

1692

} else {

1693

if(S_ISREG(st.st_mode)

1694

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

1695

ret = fchown(seckey_fd, uid, gid);

1696

if(ret == -1){

1697

perror_plus("fchown");

1698

}

1699

}

1700

}

1701

TEMP_FAILURE_RETRY(close(seckey_fd));

1702

}

1703

}

1704

1705

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

1706

int pubkey_fd = open(pubkey, O_RDONLY);

1707

if(pubkey_fd == -1){

1708

perror_plus("open");

1709

} else {

1710

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

1711

if(ret == -1){

1712

perror_plus("fstat");

1713

} else {

1714

if(S_ISREG(st.st_mode)

1715

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

1716

ret = fchown(pubkey_fd, uid, gid);

1717

if(ret == -1){

1718

perror_plus("fchown");

1719

}

1720

}

1721

}

1722

TEMP_FAILURE_RETRY(close(pubkey_fd));

1723

}

1724

}

1725

1726

/* Lower privileges */

1727

errno = 0;

1728

ret = seteuid(uid);

1729

if(ret == -1){

1730

perror_plus("seteuid");

2067

2068

/* Re-raise privileges */

2069

ret_errno = raise_privileges();

2070

if(ret_errno != 0){

2071

errno = ret_errno;

2072

perror_plus("Failed to raise privileges");

2073

} else {

2074

struct stat st;

2075

2076

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

2077

int seckey_fd = open(seckey, O_RDONLY);

2078

if(seckey_fd == -1){

2079

perror_plus("open");

2080

} else {

2081

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

2082

if(ret == -1){

2083

perror_plus("fstat");

2084

} else {

2085

if(S_ISREG(st.st_mode)

2086

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

2087

ret = fchown(seckey_fd, uid, gid);

2088

if(ret == -1){

2089

perror_plus("fchown");

2090

}

2091

}

2092

}

2093

TEMP_FAILURE_RETRY(close(seckey_fd));

2094

}

2095

}

2096

2097

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

2098

int pubkey_fd = open(pubkey, O_RDONLY);

2099

if(pubkey_fd == -1){

2100

perror_plus("open");

2101

} else {

2102

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

2103

if(ret == -1){

2104

perror_plus("fstat");

2105

} else {

2106

if(S_ISREG(st.st_mode)

2107

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

2108

ret = fchown(pubkey_fd, uid, gid);

2109

if(ret == -1){

2110

perror_plus("fchown");

2111

}

2112

}

2113

}

2114

TEMP_FAILURE_RETRY(close(pubkey_fd));

2115

}

2116

}

2117

2118

/* Lower privileges */

2119

ret_errno = lower_privileges();

2120

if(ret_errno != 0){

2121

errno = ret_errno;

2122

perror_plus("Failed to lower privileges");

2123

}

2124

}

2125

}

2126

2127

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

2128

{

2129

char *interface = NULL;

2130

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

2131

interface))){

2132

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

2133

and if_nametoindex(interface) == 0){

2134

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

2135

fprintf_plus(stderr, "Not using nonexisting interface"

2136

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

2137

}

2138

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

2139

interface = NULL;

2140

}

1731

2141

}

1732

2142

}

1733

2143

1734

2144

/* Run network hooks */

1735

2145

{

1736

/* Re-raise priviliges */

1737

errno = 0;

1738

ret = seteuid(0);

1739

if(ret == -1){

1740

perror_plus("seteuid");

1741

}

1742

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

1743

goto end;

1744

}

1745

/* Lower privileges */

1746

errno = 0;

1747

ret = seteuid(uid);

1748

if(ret == -1){

1749

perror_plus("seteuid");

1750

}

2146

if(mc.interfaces != NULL){

2147

interfaces_hooks = malloc(mc.interfaces_size);

2148

if(interfaces_hooks == NULL){

2149

perror_plus("malloc");

2150

goto end;

2151

}

2152

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

2153

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

2154

}

2155

run_network_hooks("start", interfaces_hooks != NULL ?

2156

interfaces_hooks : "", delay);

1751

2157

}

1752

2158

1753

2159

if(not debug){

1754

2160

avahi_set_log_function(empty_log);

1755

2161

}

1756

2162

1757

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

1758

struct dirent **direntries;

1759

/* First look for interfaces that are up */

1760

ret = scandir(sys_class_net, &direntries, up_interface,

1761

alphasort);

1762

if(ret == 0){

1763

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

1764

free(direntries);

1765

ret = scandir(sys_class_net, &direntries, good_interface,

1766

alphasort);

1767

}

1768

if(ret >= 1){

1769

/* Pick the first interface returned */

1770

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

1771

if(debug){

1772

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

1773

}

1774

if(interface == NULL){

1775

perror_plus("malloc");

1776

free(direntries);

1777

exitcode = EXIT_FAILURE;

1778

goto end;

1779

}

1780

free(direntries);

1781

} else {

1782

free(direntries);

1783

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

1784

exitcode = EXIT_FAILURE;

1785

goto end;

1786

}

1787

}

1788

1789

2163

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

1790

2164

from the signal handler */

1791

2165

/* Initialize the pseudo-RNG for Avahi */

1792

2166

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

1793

mc.simple_poll = avahi_simple_poll_new();

1794

if(mc.simple_poll == NULL){

2167

simple_poll = avahi_simple_poll_new();

2168

if(simple_poll == NULL){

1795

2169

fprintf_plus(stderr,

1796

2170

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

1797

2171

exitcode = EX_UNAVAILABLE;

1861

2235

}

1862

2236

}

1863

2237

1864

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

1865

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

1866

if_index = (AvahiIfIndex) if_nametoindex(interface);

1867

if(if_index == 0){

1868

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

1869

exitcode = EX_UNAVAILABLE;

1870

goto end;

1871

}

1872

1873

if(quit_now){

1874

goto end;

1875

}

1876

1877

/* Re-raise priviliges */

1878

errno = 0;

1879

ret = seteuid(0);

1880

if(ret == -1){

1881

perror_plus("seteuid");

1882

}

1883

1884

#ifdef __linux__

1885

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1886

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

1887

ret = klogctl(8, NULL, 5);

1888

bool restore_loglevel = true;

1889

if(ret == -1){

1890

restore_loglevel = false;

1891

perror_plus("klogctl");

1892

}

1893

#endif /* __linux__ */

1894

1895

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1896

if(sd < 0){

1897

perror_plus("socket");

1898

exitcode = EX_OSERR;

1899

#ifdef __linux__

1900

if(restore_loglevel){

1901

ret = klogctl(7, NULL, 0);

1902

if(ret == -1){

1903

perror_plus("klogctl");

1904

}

1905

}

1906

#endif /* __linux__ */

1907

/* Lower privileges */

1908

errno = 0;

1909

ret = seteuid(uid);

1910

if(ret == -1){

1911

perror_plus("seteuid");

1912

}

1913

goto end;

1914

}

1915

strcpy(network.ifr_name, interface);

1916

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

1917

if(ret == -1){

1918

perror_plus("ioctl SIOCGIFFLAGS");

1919

#ifdef __linux__

1920

if(restore_loglevel){

1921

ret = klogctl(7, NULL, 0);

1922

if(ret == -1){

1923

perror_plus("klogctl");

1924

}

1925

}

1926

#endif /* __linux__ */

1927

exitcode = EX_OSERR;

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1934

goto end;

1935

}

1936

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

1937

network.ifr_flags |= IFF_UP;

1938

take_down_interface = true;

1939

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

1940

if(ret == -1){

1941

take_down_interface = false;

1942

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1943

exitcode = EX_OSERR;

1944

#ifdef __linux__

1945

if(restore_loglevel){

1946

ret = klogctl(7, NULL, 0);

1947

if(ret == -1){

1948

perror_plus("klogctl");

2238

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

2239

if(mc.interfaces == NULL){

2240

struct dirent **direntries;

2241

/* Look for any good interfaces */

2242

ret = scandir(sys_class_net, &direntries, good_interface,

2243

alphasort);

2244

if(ret >= 1){

2245

/* Add all found interfaces to interfaces list */

2246

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

2247

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

2248

direntries[i]->d_name);

2249

if(ret_errno != 0){

2250

errno = ret_errno;

2251

perror_plus("argz_add");

2252

continue;

2253

}

2254

if(debug){

2255

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

2256

direntries[i]->d_name);

2257

}

2258

}

2259

free(direntries);

2260

} else {

2261

free(direntries);

2262

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

2263

exitcode = EXIT_FAILURE;

2264

goto end;

2265

}

2266

}

2267

2268

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

2269

{

2270

char *interface = NULL;

2271

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

2272

interface))){

2273

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

2274

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

2275

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

2276

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

2277

interface);

2278

interface = NULL;

2279

while((interface = argz_next(mc.interfaces,

2280

mc.interfaces_size, interface))){

2281

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

2282

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

2283

interface);

2284

interface = NULL;

1949

2285

}

1950

2286

}

1951

#endif /* __linux__ */

1952

/* Lower privileges */

1953

errno = 0;

1954

ret = seteuid(uid);

1955

if(ret == -1){

1956

perror_plus("seteuid");

1957

}

1958

goto end;

1959

}

1960

}

1961

/* Sleep checking until interface is running.

1962

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

1963

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

1964

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

1965

if(ret == -1){

1966

perror_plus("ioctl SIOCGIFFLAGS");

1967

} else if(network.ifr_flags & IFF_RUNNING){

1968

2287

break;

1969

2288

}

1970

struct timespec sleeptime = { .tv_nsec = 250000000 };

1971

ret = nanosleep(&sleeptime, NULL);

1972

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

1973

perror_plus("nanosleep");

1974

}

1975

}

1976

if(not take_down_interface){

1977

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

1978

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

1979

if(ret == -1){

1980

perror_plus("close");

1981

}

1982

}

1983

#ifdef __linux__

1984

if(restore_loglevel){

1985

/* Restores kernel loglevel to default */

1986

ret = klogctl(7, NULL, 0);

1987

if(ret == -1){

1988

perror_plus("klogctl");

1989

}

1990

}

1991

#endif /* __linux__ */

1992

/* Lower privileges */

1993

errno = 0;

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

1998

}

2289

bool interface_was_up = interface_is_up(interface);

2290

errno = bring_up_interface(interface, delay);

2291

if(not interface_was_up){

2292

if(errno != 0){

2293

perror_plus("Failed to bring up interface");

2294

} else {

2295

errno = argz_add(&interfaces_to_take_down,

2296

&interfaces_to_take_down_size,

2297

interface);

2298

if(errno != 0){

2299

perror_plus("argz_add");

2300

}

2301

}

2302

}

2303

}

2304

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

2305

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

2306

}

2307

}

2308

2309

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

2310

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

2311

if(debug){

2312

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

2313

mc.interfaces);

2314

}

2315

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

1999

2316

}

2000

2317

2001

2318

if(quit_now){

2002

2319

goto end;

2003

2320

}

2004

2321

2005

ret = init_gnutls_global(pubkey, seckey);

2322

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

2006

2323

if(ret == -1){

2007

2324

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

2008

2325

exitcode = EX_UNAVAILABLE;

2015

2332

goto end;

2016

2333

}

2017

2334

2018

if(mkdtemp(tempdir) == NULL){

2335

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

2336

tempdir = mkdtemp(run_tempdir);

2337

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

2338

if(debug){

2339

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

2340

run_tempdir, old_tempdir);

2341

}

2342

tempdir = mkdtemp(old_tempdir);

2343

}

2344

if(tempdir == NULL){

2019

2345

perror_plus("mkdtemp");

2020

2346

goto end;

2021

2347

}

2022

tempdir_created = true;

2023

2348

2024

2349

if(quit_now){

2025

2350

goto end;

2026

2351

}

2027

2352

2028

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

2353

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

2029

2354

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

2030

2355

exitcode = EX_UNAVAILABLE;

2031

2356

goto end;

2041

2366

/* Connect directly, do not use Zeroconf */

2042

2367

/* (Mainly meant for debugging) */

2043

2368

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

2369

2044

2370

if(address == NULL){

2045

2371

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

2046

2372

exitcode = EX_USAGE;

2051

2377

goto end;

2052

2378

}

2053

2379

2054

uint16_t port;

2380

in_port_t port;

2055

2381

errno = 0;

2056

2382

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

2057

2383

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

2058

or tmpmax != (uint16_t)tmpmax){

2384

or tmpmax != (in_port_t)tmpmax){

2059

2385

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

2060

2386

exitcode = EX_USAGE;

2061

2387

goto end;

2062

2388

}

2063

2389

2064

2390

if(quit_now){

2065

2391

goto end;

2066

2392

}

2067

2393

2068

port = (uint16_t)tmpmax;

2394

port = (in_port_t)tmpmax;

2069

2395

*address = '\0';

2070

2396

/* Colon in address indicates IPv6 */

2071

2397

int af;

2087

2413

}

2088

2414

2089

2415

while(not quit_now){

2090

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

2416

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

2417

&mc);

2091

2418

if(quit_now or ret == 0){

2092

2419

break;

2093

2420

}

2095

2422

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

2096

2423

(int)retry_interval);

2097

2424

}

2098

sleep((int)retry_interval);

2425

sleep((unsigned int)retry_interval);

2099

2426

}

2100

2427

2101

if (not quit_now){

2428

if(not quit_now){

2102

2429

exitcode = EXIT_SUCCESS;

2103

2430

}

2104

2431

2119

2446

config.publish_domain = 0;

2120

2447

2121

2448

/* Allocate a new server */

2122

mc.server = avahi_server_new(avahi_simple_poll_get

2123

(mc.simple_poll), &config, NULL,

2124

NULL, &error);

2449

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2450

&config, NULL, NULL, &ret_errno);

2125

2451

2126

2452

/* Free the Avahi configuration data */

2127

2453

avahi_server_config_free(&config);

2130

2456

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

2131

2457

if(mc.server == NULL){

2132

2458

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

2133

avahi_strerror(error));

2459

avahi_strerror(ret_errno));

2134

2460

exitcode = EX_UNAVAILABLE;

2135

2461

goto end;

2136

2462

}

2142

2468

/* Create the Avahi service browser */

2143

2469

sb = avahi_s_service_browser_new(mc.server, if_index,

2144

2470

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2145

NULL, 0, browse_callback, NULL);

2471

NULL, 0, browse_callback,

2472

(void *)&mc);

2146

2473

if(sb == NULL){

2147

2474

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

2148

2475

avahi_strerror(avahi_server_errno(mc.server)));

2159

2486

if(debug){

2160

2487

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

2161

2488

}

2162

2163

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

(int)(retry_interval * 1000));

2489

2490

ret = avahi_loop_with_timeout(simple_poll,

2491

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

2165

2492

if(debug){

2166

2493

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

2167

2494

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

2174

2501

}

2175

2502

2176

2503

/* Cleanup things */

2504

free(mc.interfaces);

2505

2177

2506

if(sb != NULL)

2178

2507

avahi_s_service_browser_free(sb);

2179

2508

2180

2509

if(mc.server != NULL)

2181

2510

avahi_server_free(mc.server);

2182

2511

2183

if(mc.simple_poll != NULL)

2184

avahi_simple_poll_free(mc.simple_poll);

2512

if(simple_poll != NULL)

2513

avahi_simple_poll_free(simple_poll);

2185

2514

2186

2515

if(gnutls_initialized){

2187

2516

gnutls_certificate_free_credentials(mc.cred);

2192

2521

if(gpgme_initialized){

2193

2522

gpgme_release(mc.ctx);

2194

2523

}

2195

2524

2196

2525

/* Cleans up the circular linked list of Mandos servers the client

2197

2526

has seen */

2198

2527

if(mc.current_server != NULL){

2204

2533

}

2205

2534

}

2206

2535

2207

/* Re-raise priviliges */

2536

/* Re-raise privileges */

2208

2537

{

2209

errno = 0;

2210

ret = seteuid(0);

2211

if(ret == -1){

2212

perror_plus("seteuid");

2213

}

2214

/* Run network hooks */

2215

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

2216

goto end;

2538

ret_errno = raise_privileges();

2539

if(ret_errno != 0){

2540

perror_plus("Failed to raise privileges");

2541

} else {

2542

2543

/* Run network hooks */

2544

run_network_hooks("stop", interfaces_hooks != NULL ?

2545

interfaces_hooks : "", delay);

2546

2547

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

2548

{

2549

char *interface = NULL;

2550

while((interface=argz_next(interfaces_to_take_down,

2551

interfaces_to_take_down_size,

2552

interface))){

2553

ret_errno = take_down_interface(interface);

2554

if(ret_errno != 0){

2555

errno = ret_errno;

2556

perror_plus("Failed to take down interface");

2557

}

2558

}

2559

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

2560

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

2561

" down\n");

2562

}

2563

}

2217

2564

}

2218

2565

2219

/* Take down the network interface */

2220

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

2221

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

2222

if(ret == -1){

2223

perror_plus("ioctl SIOCGIFFLAGS");

2224

} else if(network.ifr_flags & IFF_UP){

2225

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

2226

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

2227

if(ret == -1){

2228

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2229

}

2230

}

2231

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

2232

if(ret == -1){

2233

perror_plus("close");

2234

}

2566

ret_errno = lower_privileges_permanently();

2567

if(ret_errno != 0){

2568

perror_plus("Failed to lower privileges permanently");

2235

2569

}

2236

2570

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2571

2572

free(interfaces_to_take_down);

2573

free(interfaces_hooks);

2243

2574

2244

2575

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

2245

if(tempdir_created){

2576

if(tempdir != NULL){

2246

2577

struct dirent **direntries = NULL;

2247

2578

struct dirent *direntry = NULL;

2248

2579

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

2249

2580

alphasort);

2250

if (numentries > 0){

2581

if(numentries > 0){

2251

2582

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

2252

2583

direntry = direntries[i];

2253

2584

char *fullname = NULL;

2265

2596

free(fullname);

2266

2597

}

2267

2598

}

2268

2599

2269

2600

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

2270

2601

free(direntries);

2271

if (numentries == -1){

2602

if(numentries == -1){

2272

2603

perror_plus("scandir");

2273

2604

}

2274

2605

ret = rmdir(tempdir);