/mandos/trunk : revision 237.4.49

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() */

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42

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

43

stdout, ferror(), remove() */

43

stdout, ferror() */

44

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

45

#include <stddef.h> /* NULL, size_t, ssize_t */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect() */

59

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

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inet_pton(), connect(),

59

getnameinfo() */

60

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

60

61

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

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62

*/

62

63

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

63

64

strtoimax() */

64

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

65

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

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program_invocation_short_name */

67

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

73

*/

74

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

75

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

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

77

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

76

setgid(), pause(), _exit(),

77

unlinkat() */

78

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

78

79

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

79

80

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

80

81

argp_state, struct argp,

88

89

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

89

90

WEXITSTATUS(), WTERMSIG() */

90

91

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

92

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

93

argz_delete(), argz_append(),

94

argz_stringify(), argz_add(),

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

91

98

92

99

#ifdef __linux__

93

100

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

135

142

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

136

143

char *connect_to = NULL;

137

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

138

146

uid_t uid = 65534;

139

147

gid_t gid = 65534;

140

148

141

149

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

142

150

typedef struct server{

143

151

const char *ip;

144

uint16_t port;

152

in_port_t port;

145

153

AvahiIfIndex if_index;

146

154

int af;

147

155

struct timespec last_seen;

151

159

152

160

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

153

161

typedef struct {

154

AvahiSimplePoll *simple_poll;

155

162

AvahiServer *server;

156

163

gnutls_certificate_credentials_t cred;

157

164

unsigned int dh_bits;

159

166

const char *priority;

160

167

gpgme_ctx_t ctx;

161

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

162

171

} mandos_context;

163

172

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 };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

169

175

170

176

sig_atomic_t quit_now = 0;

171

177

int signal_received = 0;

179

185

perror(print_text);

180

186

}

181

187

182

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

188

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

183

189

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

184

190

va_list ap;

185

191

va_start (ap, format);

186

192

187

193

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

188

194

program_invocation_short_name));

189

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

195

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

190

196

}

191

197

192

198

/*

194

200

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

195

201

* "buffer_length" is how much is already used.

196

202

*/

203

__attribute__((nonnull, warn_unused_result))

197

204

size_t incbuffer(char **buffer, size_t buffer_length,

198

205

size_t buffer_capacity){

199

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

200

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

201

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

202

213

return 0;

203

214

}

215

*buffer = new_buf;

204

216

buffer_capacity += BUFFER_SIZE;

205

217

}

206

218

return buffer_capacity;

207

219

}

208

220

209

221

/* 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){

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

212

225

int ret;

213

226

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

214

227

if(new_server == NULL){

221

234

.af = af };

222

235

if(new_server->ip == NULL){

223

236

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

free(new_server->ip);

244

free(new_server);

224

245

return false;

225

246

}

226

247

/* Special case of first server */

227

if (mc.current_server == NULL){

248

if(*current_server == NULL){

228

249

new_server->next = new_server;

229

250

new_server->prev = new_server;

230

mc.current_server = new_server;

231

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

251

*current_server = new_server;

232

252

} else {

233

new_server->next = mc.current_server;

234

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

253

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

254

new_server->next = *current_server;

255

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

235

256

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;

257

(*current_server)->prev = new_server;

242

258

}

243

259

return true;

244

260

}

246

262

/*

247

263

* Initialize GPGME.

248

264

*/

249

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

250

const char *tempdir){

265

__attribute__((nonnull, warn_unused_result))

266

static bool init_gpgme(const char * const seckey,

267

const char * const pubkey,

268

const char * const tempdir,

269

mandos_context *mc){

251

270

gpgme_error_t rc;

252

271

gpgme_engine_info_t engine_info;

253

272

254

255

273

/*

256

274

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

257

275

*/

258

bool import_key(const char *filename){

276

bool import_key(const char * const filename){

259

277

int ret;

260

278

int fd;

261

279

gpgme_data_t pgp_data;

273

291

return false;

274

292

}

275

293

276

rc = gpgme_op_import(mc.ctx, pgp_data);

294

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

277

295

if(rc != GPG_ERR_NO_ERROR){

278

296

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

279

297

gpgme_strsource(rc), gpgme_strerror(rc));

323

341

}

324

342

325

343

/* Create new GPGME "context" */

326

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

344

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

327

345

if(rc != GPG_ERR_NO_ERROR){

328

346

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

329

347

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

342

360

* Decrypt OpenPGP data.

343

361

* Returns -1 on error

344

362

*/

363

__attribute__((nonnull, warn_unused_result))

345

364

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

365

size_t crypto_size,

347

char **plaintext){

366

char **plaintext,

367

mandos_context *mc){

348

368

gpgme_data_t dh_crypto, dh_plain;

349

369

gpgme_error_t rc;

350

370

ssize_t ret;

376

396

377

397

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

378

398

data buffer */

379

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

399

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

380

400

if(rc != GPG_ERR_NO_ERROR){

381

401

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

382

402

gpgme_strsource(rc), gpgme_strerror(rc));

383

403

plaintext_length = -1;

384

404

if(debug){

385

405

gpgme_decrypt_result_t result;

386

result = gpgme_op_decrypt_result(mc.ctx);

406

result = gpgme_op_decrypt_result(mc->ctx);

387

407

if(result == NULL){

388

408

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

389

409

} else {

466

486

return plaintext_length;

467

487

}

468

488

469

static const char * safer_gnutls_strerror(int value){

470

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

471

-Wunreachable-code */

489

__attribute__((warn_unused_result))

490

static const char *safer_gnutls_strerror(int value){

491

const char *ret = gnutls_strerror(value);

472

492

if(ret == NULL)

473

493

ret = "(unknown)";

474

494

return ret;

475

495

}

476

496

477

497

/* GnuTLS log function callback */

498

__attribute__((nonnull))

478

499

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

479

500

const char* string){

480

501

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

481

502

}

482

503

504

__attribute__((nonnull, warn_unused_result))

483

505

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename){

506

const char *seckeyfilename,

507

mandos_context *mc){

485

508

int ret;

486

509

487

510

if(debug){

504

527

}

505

528

506

529

/* OpenPGP credentials */

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

530

ret = gnutls_certificate_allocate_credentials(&mc->cred);

508

531

if(ret != GNUTLS_E_SUCCESS){

509

532

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

510

533

safer_gnutls_strerror(ret));

520

543

}

521

544

522

545

ret = gnutls_certificate_set_openpgp_key_file

523

(mc.cred, pubkeyfilename, seckeyfilename,

546

(mc->cred, pubkeyfilename, seckeyfilename,

524

547

GNUTLS_OPENPGP_FMT_BASE64);

525

548

if(ret != GNUTLS_E_SUCCESS){

526

549

fprintf_plus(stderr,

532

555

}

533

556

534

557

/* GnuTLS server initialization */

535

ret = gnutls_dh_params_init(&mc.dh_params);

558

ret = gnutls_dh_params_init(&mc->dh_params);

536

559

if(ret != GNUTLS_E_SUCCESS){

537

560

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

561

" initialization: %s\n",

539

562

safer_gnutls_strerror(ret));

540

563

goto globalfail;

541

564

}

542

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

565

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

543

566

if(ret != GNUTLS_E_SUCCESS){

544

567

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

545

568

safer_gnutls_strerror(ret));

546

569

goto globalfail;

547

570

}

548

571

549

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

572

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

550

573

551

574

return 0;

552

575

553

576

globalfail:

554

577

555

gnutls_certificate_free_credentials(mc.cred);

578

gnutls_certificate_free_credentials(mc->cred);

556

579

gnutls_global_deinit();

557

gnutls_dh_params_deinit(mc.dh_params);

580

gnutls_dh_params_deinit(mc->dh_params);

558

581

return -1;

559

582

}

560

583

561

static int init_gnutls_session(gnutls_session_t *session){

584

__attribute__((nonnull, warn_unused_result))

585

static int init_gnutls_session(gnutls_session_t *session,

586

mandos_context *mc){

562

587

int ret;

563

588

/* GnuTLS session creation */

564

589

do {

576

601

{

577

602

const char *err;

578

603

do {

579

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

604

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

580

605

if(quit_now){

581

606

gnutls_deinit(*session);

582

607

return -1;

593

618

594

619

do {

595

620

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

596

mc.cred);

621

mc->cred);

597

622

if(quit_now){

598

623

gnutls_deinit(*session);

599

624

return -1;

609

634

/* ignore client certificate if any. */

610

635

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

611

636

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

637

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

613

638

614

639

return 0;

615

640

}

619

644

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

620

645

621

646

/* Called when a Mandos server is found */

622

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

647

__attribute__((nonnull, warn_unused_result))

648

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

623

649

AvahiIfIndex if_index,

624

int af){

650

int af, mandos_context *mc){

625

651

int ret, tcp_sd = -1;

626

652

ssize_t sret;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

653

struct sockaddr_storage to;

631

654

char *buffer = NULL;

632

655

char *decrypted_buffer = NULL;

633

656

size_t buffer_length = 0;

657

680

return -1;

658

681

}

659

682

660

ret = init_gnutls_session(&session);

683

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

684

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

685

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

686

bool match = false;

687

{

688

char *interface = NULL;

689

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

690

interface))){

691

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

692

match = true;

693

break;

694

}

695

}

696

}

697

if(not match){

698

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

699

connect to the server */

700

if(debug){

701

char interface[IF_NAMESIZE];

702

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

703

perror_plus("if_indextoname");

704

} else {

705

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

706

" \"%s\"\n",

707

if_indextoname((unsigned int)if_index,

708

interface));

709

}

710

}

711

return -1;

712

}

713

}

714

715

ret = init_gnutls_session(&session, mc);

661

716

if(ret != 0){

662

717

return -1;

663

718

}

664

719

665

720

if(debug){

666

721

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

667

PRIu16 "\n", ip, port);

722

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

668

723

}

669

724

670

725

tcp_sd = socket(pf, SOCK_STREAM, 0);

682

737

683

738

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

684

739

if(af == AF_INET6){

685

to.in6.sin6_family = (sa_family_t)af;

686

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

740

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

741

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

687

742

} else { /* IPv4 */

688

to.in.sin_family = (sa_family_t)af;

689

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

743

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

744

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

690

745

}

691

746

if(ret < 0 ){

692

747

int e = errno;

701

756

goto mandos_end;

702

757

}

703

758

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*/

759

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

760

if(IN6_IS_ADDR_LINKLOCAL

761

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

711

762

if(if_index == AVAHI_IF_UNSPEC){

712

763

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

713

764

" incomplete without a network interface\n");

715

766

goto mandos_end;

716

767

}

717

768

/* Set the network interface number as scope */

718

to.in6.sin6_scope_id = (uint32_t)if_index;

769

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

719

770

}

720

771

} else {

721

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

722

-Wconversion and

723

-Wunreachable-code */

772

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

724

773

}

725

774

726

775

if(quit_now){

734

783

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

735

784

perror_plus("if_indextoname");

736

785

} else {

737

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

738

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

786

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

787

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

739

788

}

740

789

} else {

741

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

742

ip, port);

790

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

791

ip, (uintmax_t)port);

743

792

}

744

793

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

745

794

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

746

const char *pcret;

747

795

if(af == AF_INET6){

748

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

749

sizeof(addrstr));

796

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

797

sizeof(struct sockaddr_in6),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

750

800

} else {

751

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

752

sizeof(addrstr));

801

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

802

sizeof(struct sockaddr_in),

803

addrstr, sizeof(addrstr), NULL, 0,

804

NI_NUMERICHOST);

753

805

}

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

}

806

if(ret == EAI_SYSTEM){

807

perror_plus("getnameinfo");

808

} else if(ret != 0) {

809

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

810

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

811

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

760

812

}

761

813

}

762

814

766

818

}

767

819

768

820

if(af == AF_INET6){

769

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

821

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

822

sizeof(struct sockaddr_in6));

770

823

} else {

771

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

824

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

825

sizeof(struct sockaddr_in));

772

826

}

773

827

if(ret < 0){

774

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

828

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

775

829

int e = errno;

776

830

perror_plus("connect");

777

831

errno = e;

938

992

if(buffer_length > 0){

939

993

ssize_t decrypted_buffer_size;

940

994

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

941

&decrypted_buffer);

995

&decrypted_buffer, mc);

942

996

if(decrypted_buffer_size >= 0){

943

997

944

998

written = 0;

992

1046

return retval;

993

1047

}

994

1048

1049

__attribute__((nonnull))

995

1050

static void resolve_callback(AvahiSServiceResolver *r,

996

1051

AvahiIfIndex interface,

997

1052

AvahiProtocol proto,

1005

1060

AVAHI_GCC_UNUSED AvahiStringList *txt,

1006

1061

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1007

1062

flags,

1008

AVAHI_GCC_UNUSED void* userdata){

1009

assert(r);

1063

void *mc){

1064

if(r == NULL){

1065

return;

1066

}

1010

1067

1011

1068

/* Called whenever a service has been resolved successfully or

1012

1069

timed out */

1021

1078

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

1022

1079

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

1023

1080

domain,

1024

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_strerror(avahi_server_errno

1082

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

1025

1083

break;

1026

1084

1027

1085

case AVAHI_RESOLVER_FOUND:

1033

1091

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

1034

1092

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

1035

1093

}

1036

int ret = start_mandos_communication(ip, port, interface,

1037

avahi_proto_to_af(proto));

1094

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

1095

interface,

1096

avahi_proto_to_af(proto),

1097

mc);

1038

1098

if(ret == 0){

1039

avahi_simple_poll_quit(mc.simple_poll);

1099

avahi_simple_poll_quit(simple_poll);

1040

1100

} else {

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1101

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

1102

avahi_proto_to_af(proto),

1103

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

1043

1104

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

1044

1105

" list\n", name);

1045

1106

}

1058

1119

const char *domain,

1059

1120

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1060

1121

flags,

1061

AVAHI_GCC_UNUSED void* userdata){

1062

assert(b);

1122

void *mc){

1123

if(b == NULL){

1124

return;

1125

}

1063

1126

1064

1127

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

1065

1128

is removed from the LAN */

1073

1136

case AVAHI_BROWSER_FAILURE:

1074

1137

1075

1138

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

1076

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_simple_poll_quit(mc.simple_poll);

1139

avahi_strerror(avahi_server_errno

1140

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

1141

avahi_simple_poll_quit(simple_poll);

1078

1142

return;

1079

1143

1080

1144

case AVAHI_BROWSER_NEW:

1083

1147

the callback function is called the Avahi server will free the

1084

1148

resolver for us. */

1085

1149

1086

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

1087

name, type, domain, protocol, 0,

1088

resolve_callback, NULL) == NULL)

1150

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

1151

interface, protocol, name, type,

1152

domain, protocol, 0,

1153

resolve_callback, mc) == NULL)

1089

1154

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

1090

1155

" %s\n", name,

1091

avahi_strerror(avahi_server_errno(mc.server)));

1156

avahi_strerror(avahi_server_errno

1157

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

1092

1158

break;

1093

1159

1094

1160

case AVAHI_BROWSER_REMOVE:

1113

1179

signal_received = sig;

1114

1180

int old_errno = errno;

1115

1181

/* set main loop to exit */

1116

if(mc.simple_poll != NULL){

1117

avahi_simple_poll_quit(mc.simple_poll);

1182

if(simple_poll != NULL){

1183

avahi_simple_poll_quit(simple_poll);

1118

1184

}

1119

1185

errno = old_errno;

1120

1186

}

1121

1187

1188

__attribute__((nonnull, warn_unused_result))

1122

1189

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

1123

1190

int ret;

1191

error_t ret_errno;

1124

1192

1125

1193

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

1126

1194

if(s < 0){

1195

ret_errno = errno;

1127

1196

perror_plus("socket");

1197

errno = ret_errno;

1128

1198

return false;

1129

1199

}

1130

1200

strcpy(ifr->ifr_name, ifname);

1131

1201

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1132

1202

if(ret == -1){

1133

1203

if(debug){

1204

ret_errno = errno;

1134

1205

perror_plus("ioctl SIOCGIFFLAGS");

1206

errno = ret_errno;

1135

1207

}

1136

1208

return false;

1137

1209

}

1138

1210

return true;

1139

1211

}

1140

1212

1213

__attribute__((nonnull, warn_unused_result))

1141

1214

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

1142

1215

1143

1216

/* Reject the loopback device */

1185

1258

* corresponds to an acceptable network device.

1186

1259

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

1187

1260

*/

1261

__attribute__((nonnull, warn_unused_result))

1188

1262

int good_interface(const struct dirent *if_entry){

1189

1263

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

1190

1264

return 0;

1206

1280

}

1207

1281

1208

1282

/*

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

1283

* This function determines if a network interface is up.

1284

*/

1285

__attribute__((nonnull, warn_unused_result))

1286

bool interface_is_up(const char *interface){

1287

struct ifreq ifr;

1288

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

1289

if(debug){

1290

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

1291

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

1292

}

1293

return false;

1294

}

1295

1296

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

1297

}

1298

1299

/*

1300

* This function determines if a network interface is running

1301

*/

1302

__attribute__((nonnull, warn_unused_result))

1303

bool interface_is_running(const char *interface){

1304

struct ifreq ifr;

1305

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

1306

if(debug){

1307

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

1308

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

1309

}

1310

return false;

1311

}

1312

1313

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

1314

}

1315

1316

__attribute__((nonnull, pure, warn_unused_result))

1251

1317

int notdotentries(const struct dirent *direntry){

1252

1318

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

1253

1319

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

1260

1326

}

1261

1327

1262

1328

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

1329

__attribute__((nonnull, warn_unused_result))

1263

1330

int runnable_hook(const struct dirent *direntry){

1264

1331

int ret;

1265

1332

size_t sret;

1273

1340

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

1274

1341

"abcdefghijklmnopqrstuvwxyz"

1275

1342

"0123456789"

1276

"_-");

1343

"_.-");

1277

1344

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

1278

1345

/* Contains non-allowed characters */

1279

1346

if(debug){

1283

1350

return 0;

1284

1351

}

1285

1352

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);

1353

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

1294

1354

if(ret == -1){

1295

1355

if(debug){

1296

1356

perror_plus("Could not stat hook");

1320

1380

return 1;

1321

1381

}

1322

1382

1323

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1383

__attribute__((nonnull, warn_unused_result))

1384

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1385

mandos_context *mc){

1324

1386

int ret;

1325

1387

struct timespec now;

1326

1388

struct timespec waited_time;

1327

1389

intmax_t block_time;

1328

1390

1329

1391

while(true){

1330

if(mc.current_server == NULL){

1331

if (debug){

1392

if(mc->current_server == NULL){

1393

if(debug){

1332

1394

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

1333

1395

" No timeout!\n");

1334

1396

}

1335

1397

ret = avahi_simple_poll_iterate(s, -1);

1336

1398

} else {

1337

if (debug){

1399

if(debug){

1338

1400

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

1339

1401

" it, or wait\n");

1340

1402

}

1347

1409

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

1348

1410

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

1349

1411

waited_time.tv_sec = (now.tv_sec

1350

- mc.current_server->last_seen.tv_sec);

1412

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

1351

1413

waited_time.tv_nsec = (now.tv_nsec

1352

- mc.current_server->last_seen.tv_nsec);

1414

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

1353

1415

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

1354

1416

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

1355

1417

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

1357

1419

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

1358

1420

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

1359

1421

1360

if (debug){

1422

if(debug){

1361

1423

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

1362

1424

block_time);

1363

1425

}

1364

1426

1365

1427

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);

1428

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

1429

mc->current_server->port,

1430

mc->current_server->if_index,

1431

mc->current_server->af, mc);

1370

1432

if(ret == 0){

1371

avahi_simple_poll_quit(mc.simple_poll);

1433

avahi_simple_poll_quit(s);

1372

1434

return 0;

1373

1435

}

1374

1436

ret = clock_gettime(CLOCK_MONOTONIC,

1375

&mc.current_server->last_seen);

1437

&mc->current_server->last_seen);

1376

1438

if(ret == -1){

1377

1439

perror_plus("clock_gettime");

1378

1440

return -1;

1379

1441

}

1380

mc.current_server = mc.current_server->next;

1442

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

1381

1443

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

1382

1444

servers, but don't block */

1383

1445

}

1385

1447

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

1386

1448

}

1387

1449

if(ret != 0){

1388

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

1450

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

1389

1451

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

1390

1452

}

1391

1453

}

1393

1455

}

1394

1456

1395

1457

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

1458

__attribute__((warn_unused_result))

1396

1459

error_t raise_privileges(void){

1397

1460

error_t old_errno = errno;

1398

1461

error_t ret_errno = 0;

1399

1462

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

1400

1463

ret_errno = errno;

1401

perror_plus("seteuid");

1402

1464

}

1403

1465

errno = old_errno;

1404

1466

return ret_errno;

1405

1467

}

1406

1468

1407

1469

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

1470

__attribute__((warn_unused_result))

1408

1471

error_t raise_privileges_permanently(void){

1409

1472

error_t old_errno = errno;

1410

1473

error_t ret_errno = raise_privileges();

1414

1477

}

1415

1478

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

1416

1479

ret_errno = errno;

1417

perror_plus("seteuid");

1418

1480

}

1419

1481

errno = old_errno;

1420

1482

return ret_errno;

1421

1483

}

1422

1484

1423

1485

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

1486

__attribute__((warn_unused_result))

1424

1487

error_t lower_privileges(void){

1425

1488

error_t old_errno = errno;

1426

1489

error_t ret_errno = 0;

1427

1490

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

1428

1491

ret_errno = errno;

1429

perror_plus("seteuid");

1430

}

1431

errno = old_errno;

1432

return ret_errno;

1433

}

1434

1435

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

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

}

1505

errno = old_errno;

1506

return ret_errno;

1507

}

1508

1509

__attribute__((nonnull))

1510

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

1436

1511

const float delay){

1437

struct dirent **direntries;

1438

struct dirent *direntry;

1439

int ret;

1440

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

1441

alphasort);

1512

struct dirent **direntries = NULL;

1513

if(hookdir_fd == -1){

1514

hookdir_fd = open(hookdir, O_RDONLY);

1515

if(hookdir_fd == -1){

1516

if(errno == ENOENT){

1517

if(debug){

1518

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

1519

" found\n", hookdir);

1520

}

1521

} else {

1522

perror_plus("open");

1523

}

1524

return;

1525

}

1526

}

1527

#ifdef __GLIBC__

1528

#if __GLIBC_PREREQ(2, 15)

1529

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

1530

runnable_hook, alphasort);

1531

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

1532

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

1533

alphasort);

1534

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

1535

#else /* not __GLIBC__ */

1536

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

1537

alphasort);

1538

#endif /* not __GLIBC__ */

1442

1539

if(numhooks == -1){

1443

1540

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){

1541

return;

1542

}

1543

struct dirent *direntry;

1544

int ret;

1545

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

1546

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

1547

direntry = direntries[i];

1548

if(debug){

1549

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

1550

direntry->d_name);

1551

}

1552

pid_t hook_pid = fork();

1553

if(hook_pid == 0){

1554

/* Child */

1555

/* Raise privileges */

1556

errno = raise_privileges_permanently();

1557

if(errno != 0){

1558

perror_plus("Failed to raise privileges");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Set group */

1562

errno = 0;

1563

ret = setgid(0);

1564

if(ret == -1){

1565

perror_plus("setgid");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Reset supplementary groups */

1569

errno = 0;

1570

ret = setgroups(0, NULL);

1571

if(ret == -1){

1572

perror_plus("setgroups");

1573

_exit(EX_NOPERM);

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

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

1591

if(ret == -1){

1592

perror_plus("setenv");

1593

_exit(EX_OSERR);

1594

}

1595

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

1596

if(ret == -1){

1597

perror_plus("setenv");

1598

_exit(EX_OSERR);

1599

}

1600

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

1601

if(ret == -1){

1602

perror_plus("setenv");

1603

_exit(EX_OSERR);

1604

}

1605

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

1606

if(ret == -1){

1607

perror_plus("setenv");

1608

_exit(EX_OSERR);

1609

}

1610

char *delaystring;

1611

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

1612

if(ret == -1){

1451

1613

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

}

1614

_exit(EX_OSERR);

1615

}

1616

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

1617

if(ret == -1){

1510

1618

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

}

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

free(delaystring);

1623

if(connect_to != NULL){

1624

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

1625

if(ret == -1){

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

}

1630

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

1631

if(hook_fd == -1){

1632

perror_plus("openat");

1633

_exit(EXIT_FAILURE);

1634

}

1635

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

1636

perror_plus("close");

1637

_exit(EXIT_FAILURE);

1638

}

1639

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

1640

environ) == -1){

1641

perror_plus("fexecve");

1642

_exit(EXIT_FAILURE);

1643

}

1644

} else {

1645

int status;

1646

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

1647

perror_plus("waitpid");

1648

continue;

1649

}

1650

if(WIFEXITED(status)){

1651

if(WEXITSTATUS(status) != 0){

1652

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

1653

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

1654

WEXITSTATUS(status));

1655

continue;

1656

}

1657

} else if(WIFSIGNALED(status)){

1658

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

1659

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

1660

WTERMSIG(status));

1661

continue;

1522

1662

} 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;

1663

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

1664

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

1665

continue;

1666

}

1667

}

1668

if(debug){

1669

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

1670

direntry->d_name);

1671

}

1672

}

1673

free(direntries);

1674

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

1675

perror_plus("close");

1676

} else {

1677

hookdir_fd = -1;

1678

}

1679

close(devnull);

1559

1680

}

1560

1681

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;

1682

__attribute__((nonnull, warn_unused_result))

1683

error_t bring_up_interface(const char *const interface,

1684

const float delay){

1685

error_t old_errno = errno;

1566

1686

int ret;

1567

1687

struct ifreq network;

1568

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1688

unsigned int if_index = if_nametoindex(interface);

1569

1689

if(if_index == 0){

1570

1690

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

1571

1691

errno = old_errno;

1577

1697

return EINTR;

1578

1698

}

1579

1699

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);

1700

if(not interface_is_up(interface)){

1701

error_t ret_errno = 0, ioctl_errno = 0;

1702

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

1703

ret_errno = errno;

1704

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

1705

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

1706

errno = old_errno;

1707

return ret_errno;

1708

}

1709

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

1710

1711

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

1712

if(sd == -1){

1713

ret_errno = errno;

1714

perror_plus("socket");

1715

errno = old_errno;

1716

return ret_errno;

1717

}

1718

1719

if(quit_now){

1720

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

1721

if(ret == -1){

1722

perror_plus("close");

1723

}

1724

errno = old_errno;

1725

return EINTR;

1726

}

1727

1728

if(debug){

1729

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

1730

interface);

1731

}

1732

1733

/* Raise privileges */

1734

ret_errno = raise_privileges();

1735

if(ret_errno != 0){

1736

errno = ret_errno;

1737

perror_plus("Failed to raise privileges");

1738

}

1739

1740

#ifdef __linux__

1741

int ret_linux;

1742

bool restore_loglevel = false;

1743

if(ret_errno == 0){

1744

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1745

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

1746

ret_linux = klogctl(8, NULL, 5);

1747

if(ret_linux == -1){

1748

perror_plus("klogctl");

1749

} else {

1750

restore_loglevel = true;

1751

}

1752

}

1753

#endif /* __linux__ */

1754

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

1755

ioctl_errno = errno;

1756

#ifdef __linux__

1757

if(restore_loglevel){

1758

ret_linux = klogctl(7, NULL, 0);

1759

if(ret_linux == -1){

1760

perror_plus("klogctl");

1761

}

1762

}

1763

#endif /* __linux__ */

1764

1765

/* If raise_privileges() succeeded above */

1766

if(ret_errno == 0){

1767

/* Lower privileges */

1768

ret_errno = lower_privileges();

1769

if(ret_errno != 0){

1770

errno = ret_errno;

1771

perror_plus("Failed to lower privileges");

1772

}

1773

}

1774

1775

/* Close the socket */

1776

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

1632

1777

if(ret == -1){

1633

ret_errno = errno;

1778

perror_plus("close");

1779

}

1780

1781

if(ret_setflags == -1){

1782

errno = ioctl_errno;

1634

1783

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

1784

errno = old_errno;

1646

return ret_errno;

1785

return ioctl_errno;

1647

1786

}

1787

} else if(debug){

1788

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

1789

interface);

1648

1790

}

1791

1649

1792

/* Sleep checking until interface is running.

1650

1793

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

1651

1794

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){

1795

if(interface_is_running(interface)){

1656

1796

break;

1657

1797

}

1658

1798

struct timespec sleeptime = { .tv_nsec = 250000000 };

1661

1801

perror_plus("nanosleep");

1662

1802

}

1663

1803

}

1664

/* Close the socket */

1665

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

1666

if(ret == -1){

1667

perror_plus("close");

1804

1805

errno = old_errno;

1806

return 0;

1807

}

1808

1809

__attribute__((nonnull, warn_unused_result))

1810

error_t take_down_interface(const char *const interface){

1811

error_t old_errno = errno;

1812

struct ifreq network;

1813

unsigned int if_index = if_nametoindex(interface);

1814

if(if_index == 0){

1815

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

1816

errno = old_errno;

1817

return ENXIO;

1668

1818

}

1669

#ifdef __linux__

1670

if(restore_loglevel){

1671

/* Restores kernel loglevel to default */

1672

ret = klogctl(7, NULL, 0);

1819

if(interface_is_up(interface)){

1820

error_t ret_errno = 0, ioctl_errno = 0;

1821

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

1822

ret_errno = errno;

1823

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

1824

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

1825

errno = old_errno;

1826

return ret_errno;

1827

}

1828

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

1829

1830

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

1831

if(sd == -1){

1832

ret_errno = errno;

1833

perror_plus("socket");

1834

errno = old_errno;

1835

return ret_errno;

1836

}

1837

1838

if(debug){

1839

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

1840

interface);

1841

}

1842

1843

/* Raise privileges */

1844

ret_errno = raise_privileges();

1845

if(ret_errno != 0){

1846

errno = ret_errno;

1847

perror_plus("Failed to raise privileges");

1848

}

1849

1850

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

1851

ioctl_errno = errno;

1852

1853

/* If raise_privileges() succeeded above */

1854

if(ret_errno == 0){

1855

/* Lower privileges */

1856

ret_errno = lower_privileges();

1857

if(ret_errno != 0){

1858

errno = ret_errno;

1859

perror_plus("Failed to lower privileges");

1860

}

1861

}

1862

1863

/* Close the socket */

1864

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

1673

1865

if(ret == -1){

1674

perror_plus("klogctl");

1675

}

1866

perror_plus("close");

1867

}

1868

1869

if(ret_setflags == -1){

1870

errno = ioctl_errno;

1871

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1872

errno = old_errno;

1873

return ioctl_errno;

1874

}

1875

} else if(debug){

1876

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

1877

interface);

1676

1878

}

1677

#endif /* __linux__ */

1678

/* Lower privileges */

1679

lower_privileges();

1879

1680

1880

errno = old_errno;

1681

1881

return 0;

1682

1882

}

1683

1883

1684

1884

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

1885

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

1886

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

1887

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

1888

.interfaces = NULL, .interfaces_size = 0 };

1685

1889

AvahiSServiceBrowser *sb = NULL;

1686

int error;

1890

error_t ret_errno;

1687

1891

int ret;

1688

1892

intmax_t tmpmax;

1689

1893

char *tmp;

1690

1894

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;

1895

char *interfaces_to_take_down = NULL;

1896

size_t interfaces_to_take_down_size = 0;

1897

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

1898

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

1899

char *tempdir = NULL;

1697

1900

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1698

1901

const char *seckey = PATHDIR "/" SECKEY;

1699

1902

const char *pubkey = PATHDIR "/" PUBKEY;

1903

char *interfaces_hooks = NULL;

1700

1904

1701

1905

bool gnutls_initialized = false;

1702

1906

bool gpgme_initialized = false;

1793

1997

connect_to = arg;

1794

1998

break;

1795

1999

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

1796

interface = arg;

2000

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

2001

arg, (int)',');

2002

if(ret_errno != 0){

2003

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

2004

}

1797

2005

break;

1798

2006

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

1799

2007

seckey = arg;

1876

2084

/* Work around Debian bug #633582:

1877

2085

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

1878

2086

1879

/* Re-raise priviliges */

1880

if(raise_privileges() == 0){

2087

/* Re-raise privileges */

2088

ret_errno = raise_privileges();

2089

if(ret_errno != 0){

2090

errno = ret_errno;

2091

perror_plus("Failed to raise privileges");

2092

} else {

1881

2093

struct stat st;

1882

2094

1883

2095

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

1923

2135

}

1924

2136

1925

2137

/* Lower privileges */

1926

errno = 0;

1927

ret = seteuid(uid);

1928

if(ret == -1){

1929

perror_plus("seteuid");

2138

ret_errno = lower_privileges();

2139

if(ret_errno != 0){

2140

errno = ret_errno;

2141

perror_plus("Failed to lower privileges");

2142

}

2143

}

2144

}

2145

2146

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

2147

{

2148

char *interface = NULL;

2149

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

2150

interface))){

2151

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

2152

and if_nametoindex(interface) == 0){

2153

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

2154

fprintf_plus(stderr, "Not using nonexisting interface"

2155

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

2156

}

2157

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

2158

interface = NULL;

1930

2159

}

1931

2160

}

1932

2161

}

1933

2162

1934

2163

/* Run network hooks */

1935

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

1936

goto end;

2164

{

2165

if(mc.interfaces != NULL){

2166

interfaces_hooks = malloc(mc.interfaces_size);

2167

if(interfaces_hooks == NULL){

2168

perror_plus("malloc");

2169

goto end;

2170

}

2171

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

2172

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

2173

}

2174

run_network_hooks("start", interfaces_hooks != NULL ?

2175

interfaces_hooks : "", delay);

1937

2176

}

1938

2177

1939

2178

if(not debug){

1940

2179

avahi_set_log_function(empty_log);

1941

2180

}

1942

2181

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

2182

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

1976

2183

from the signal handler */

1977

2184

/* Initialize the pseudo-RNG for Avahi */

1978

2185

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

1979

mc.simple_poll = avahi_simple_poll_new();

1980

if(mc.simple_poll == NULL){

2186

simple_poll = avahi_simple_poll_new();

2187

if(simple_poll == NULL){

1981

2188

fprintf_plus(stderr,

1982

2189

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

1983

2190

exitcode = EX_UNAVAILABLE;

2047

2254

}

2048

2255

}

2049

2256

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

}

2257

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

2258

if(mc.interfaces == NULL){

2259

struct dirent **direntries = NULL;

2260

/* Look for any good interfaces */

2261

ret = scandir(sys_class_net, &direntries, good_interface,

2262

alphasort);

2263

if(ret >= 1){

2264

/* Add all found interfaces to interfaces list */

2265

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

2266

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

2267

direntries[i]->d_name);

2268

if(ret_errno != 0){

2269

errno = ret_errno;

2270

perror_plus("argz_add");

2271

continue;

2272

}

2273

if(debug){

2274

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

2275

direntries[i]->d_name);

2276

}

2277

}

2278

free(direntries);

2279

} else {

2280

if(ret == 0){

2281

free(direntries);

2282

}

2283

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

2284

exitcode = EXIT_FAILURE;

2285

goto end;

2286

}

2287

}

2288

2289

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

2290

{

2291

char *interface = NULL;

2292

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

2293

interface))){

2294

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

2295

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

2296

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

2297

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

2298

interface);

2299

interface = NULL;

2300

while((interface = argz_next(mc.interfaces,

2301

mc.interfaces_size, interface))){

2302

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

2303

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

2304

interface);

2305

interface = NULL;

2306

}

2307

}

2308

break;

2309

}

2310

bool interface_was_up = interface_is_up(interface);

2311

errno = bring_up_interface(interface, delay);

2312

if(not interface_was_up){

2313

if(errno != 0){

2314

perror_plus("Failed to bring up interface");

2315

} else {

2316

errno = argz_add(&interfaces_to_take_down,

2317

&interfaces_to_take_down_size,

2318

interface);

2319

if(errno != 0){

2320

perror_plus("argz_add");

2321

}

2322

}

2323

}

2324

}

2325

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

2326

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

2327

}

2328

}

2329

2330

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

2331

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

2332

if(debug){

2333

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

2334

mc.interfaces);

2335

}

2336

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

2057

2337

}

2058

2338

2059

2339

if(quit_now){

2060

2340

goto end;

2061

2341

}

2062

2342

2063

ret = init_gnutls_global(pubkey, seckey);

2343

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

2064

2344

if(ret == -1){

2065

2345

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

2066

2346

exitcode = EX_UNAVAILABLE;

2073

2353

goto end;

2074

2354

}

2075

2355

2076

if(mkdtemp(tempdir) == NULL){

2356

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

2357

tempdir = mkdtemp(run_tempdir);

2358

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

2359

if(debug){

2360

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

2361

run_tempdir, old_tempdir);

2362

}

2363

tempdir = mkdtemp(old_tempdir);

2364

}

2365

if(tempdir == NULL){

2077

2366

perror_plus("mkdtemp");

2078

2367

goto end;

2079

2368

}

2080

tempdir_created = true;

2081

2369

2082

2370

if(quit_now){

2083

2371

goto end;

2084

2372

}

2085

2373

2086

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

2374

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

2087

2375

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

2088

2376

exitcode = EX_UNAVAILABLE;

2089

2377

goto end;

2110

2398

goto end;

2111

2399

}

2112

2400

2113

uint16_t port;

2401

in_port_t port;

2114

2402

errno = 0;

2115

2403

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

2116

2404

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

2117

or tmpmax != (uint16_t)tmpmax){

2405

or tmpmax != (in_port_t)tmpmax){

2118

2406

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

2119

2407

exitcode = EX_USAGE;

2120

2408

goto end;

2121

2409

}

2122

2410

2123

2411

if(quit_now){

2124

2412

goto end;

2125

2413

}

2126

2414

2127

port = (uint16_t)tmpmax;

2415

port = (in_port_t)tmpmax;

2128

2416

*address = '\0';

2129

2417

/* Colon in address indicates IPv6 */

2130

2418

int af;

2146

2434

}

2147

2435

2148

2436

while(not quit_now){

2149

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

2437

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

2438

&mc);

2150

2439

if(quit_now or ret == 0){

2151

2440

break;

2152

2441

}

2154

2443

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

2155

2444

(int)retry_interval);

2156

2445

}

2157

sleep((int)retry_interval);

2446

sleep((unsigned int)retry_interval);

2158

2447

}

2159

2448

2160

if (not quit_now){

2449

if(not quit_now){

2161

2450

exitcode = EXIT_SUCCESS;

2162

2451

}

2163

2452

2178

2467

config.publish_domain = 0;

2179

2468

2180

2469

/* Allocate a new server */

2181

mc.server = avahi_server_new(avahi_simple_poll_get

2182

(mc.simple_poll), &config, NULL,

2183

NULL, &error);

2470

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2471

&config, NULL, NULL, &ret_errno);

2184

2472

2185

2473

/* Free the Avahi configuration data */

2186

2474

avahi_server_config_free(&config);

2189

2477

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

2190

2478

if(mc.server == NULL){

2191

2479

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

2192

avahi_strerror(error));

2480

avahi_strerror(ret_errno));

2193

2481

exitcode = EX_UNAVAILABLE;

2194

2482

goto end;

2195

2483

}

2201

2489

/* Create the Avahi service browser */

2202

2490

sb = avahi_s_service_browser_new(mc.server, if_index,

2203

2491

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2204

NULL, 0, browse_callback, NULL);

2492

NULL, 0, browse_callback,

2493

(void *)&mc);

2205

2494

if(sb == NULL){

2206

2495

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

2207

2496

avahi_strerror(avahi_server_errno(mc.server)));

2218

2507

if(debug){

2219

2508

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

2220

2509

}

2221

2222

ret = avahi_loop_with_timeout(mc.simple_poll,

2223

(int)(retry_interval * 1000));

2510

2511

ret = avahi_loop_with_timeout(simple_poll,

2512

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

2224

2513

if(debug){

2225

2514

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

2226

2515

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

2233

2522

}

2234

2523

2235

2524

/* Cleanup things */

2525

free(mc.interfaces);

2526

2236

2527

if(sb != NULL)

2237

2528

avahi_s_service_browser_free(sb);

2238

2529

2239

2530

if(mc.server != NULL)

2240

2531

avahi_server_free(mc.server);

2241

2532

2242

if(mc.simple_poll != NULL)

2243

avahi_simple_poll_free(mc.simple_poll);

2533

if(simple_poll != NULL)

2534

avahi_simple_poll_free(simple_poll);

2244

2535

2245

2536

if(gnutls_initialized){

2246

2537

gnutls_certificate_free_credentials(mc.cred);

2263

2554

}

2264

2555

}

2265

2556

2266

/* Run network hooks */

2267

run_network_hooks("stop", interface, delay);

2268

2269

/* Re-raise priviliges */

2557

/* Re-raise privileges */

2270

2558

{

2271

raise_privileges();

2559

ret_errno = raise_privileges();

2560

if(ret_errno != 0){

2561

errno = ret_errno;

2562

perror_plus("Failed to raise privileges");

2563

} else {

2564

2565

/* Run network hooks */

2566

run_network_hooks("stop", interfaces_hooks != NULL ?

2567

interfaces_hooks : "", delay);

2568

2569

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

2570

{

2571

char *interface = NULL;

2572

while((interface=argz_next(interfaces_to_take_down,

2573

interfaces_to_take_down_size,

2574

interface))){

2575

ret_errno = take_down_interface(interface);

2576

if(ret_errno != 0){

2577

errno = ret_errno;

2578

perror_plus("Failed to take down interface");

2579

}

2580

}

2581

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

2582

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

2583

" down\n");

2584

}

2585

}

2586

}

2272

2587

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

}

2588

ret_errno = lower_privileges_permanently();

2589

if(ret_errno != 0){

2590

errno = ret_errno;

2591

perror_plus("Failed to lower privileges permanently");

2289

2592

}

2290

2593

}

2291

/* Lower privileges permanently */

2292

errno = 0;

2293

ret = setuid(uid);

2294

if(ret == -1){

2295

perror_plus("setuid");

2296

}

2594

2595

free(interfaces_to_take_down);

2596

free(interfaces_hooks);

2297

2597

2298

2598

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

2299

if(tempdir_created){

2599

if(tempdir != NULL){

2300

2600

struct dirent **direntries = NULL;

2301

struct dirent *direntry = NULL;

2302

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

2303

alphasort);

2304

if (numentries > 0){

2305

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

2306

direntry = direntries[i];

2307

char *fullname = NULL;

2308

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

2309

direntry->d_name);

2310

if(ret < 0){

2311

perror_plus("asprintf");

2312

continue;

2313

}

2314

ret = remove(fullname);

2315

if(ret == -1){

2316

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

2317

strerror(errno));

2318

}

2319

free(fullname);

2601

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

2602

O_NOFOLLOW));

2603

if(tempdir_fd == -1){

2604

perror_plus("open");

2605

} else {

2606

#ifdef __GLIBC__

2607

#if __GLIBC_PREREQ(2, 15)

2608

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

2609

notdotentries, alphasort);

2610

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

2611

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

2612

alphasort);

2613

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

2614

#else /* not __GLIBC__ */

2615

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

2616

alphasort);

2617

#endif /* not __GLIBC__ */

2618

if(numentries >= 0){

2619

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

2620

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

2621

if(ret == -1){

2622

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

2623

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

2624

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

2625

}

2626

}

2627

2628

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

2629

free(direntries);

2630

if(numentries == -1){

2631

perror_plus("scandir");

2632

}

2633

ret = rmdir(tempdir);

2634

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

2635

perror_plus("rmdir");

2636

}

2320

2637

}

2321

}

2322

2323

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

2324

free(direntries);

2325

if (numentries == -1){

2326

perror_plus("scandir");

2327

}

2328

ret = rmdir(tempdir);

2329

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

2330

perror_plus("rmdir");

2638

TEMP_FAILURE_RETRY(close(tempdir_fd));

2331

2639

}

2332

2640

}

2333

2641