/mandos/trunk : revision 594.1.4

9

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

10

*

11

* Everything else is

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13

12

13

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*

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 /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

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42

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

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stdout, ferror() */

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stdout, ferror(), remove() */

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 */

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

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

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inet_pton(), connect(),

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getnameinfo() */

60

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

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inet_pton(), connect() */

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

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60

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

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61

*/

63

62

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

64

63

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(),

76

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

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unlinkat() */

78

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

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

77

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

79

78

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

80

79

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

81

80

argp_state, struct argp,

93

92

argz_delete(), argz_append(),

94

93

argz_stringify(), argz_add(),

95

94

argz_count() */

96

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

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EAI_SYSTEM, gai_strerror() */

98

95

99

96

#ifdef __linux__

100

97

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

142

139

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

143

140

char *connect_to = NULL;

144

141

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

142

uid_t uid = 65534;

147

143

gid_t gid = 65534;

148

144

149

145

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

150

146

typedef struct server{

151

147

const char *ip;

152

in_port_t port;

148

uint16_t port;

153

149

AvahiIfIndex if_index;

154

150

int af;

155

151

struct timespec last_seen;

159

155

160

156

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

161

157

typedef struct {

158

AvahiSimplePoll *simple_poll;

162

159

AvahiServer *server;

163

160

gnutls_certificate_credentials_t cred;

164

161

unsigned int dh_bits;

166

163

const char *priority;

167

164

gpgme_ctx_t ctx;

168

165

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

166

} mandos_context;

172

167

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

168

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

169

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

170

.dh_bits = 1024, .priority = "SECURE256"

171

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

172

.current_server = NULL };

175

173

176

174

sig_atomic_t quit_now = 0;

177

175

int signal_received = 0;

185

183

perror(print_text);

186

184

}

187

185

188

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

186

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

189

187

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

190

188

va_list ap;

191

189

va_start (ap, format);

192

190

193

191

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

194

192

program_invocation_short_name));

195

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

193

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

196

194

}

197

195

198

196

/*

200

198

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

201

199

* "buffer_length" is how much is already used.

202

200

*/

203

__attribute__((nonnull, warn_unused_result))

204

201

size_t incbuffer(char **buffer, size_t buffer_length,

205

202

size_t buffer_capacity){

206

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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;

204

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

205

if(buffer == NULL){

213

206

return 0;

214

207

}

215

*buffer = new_buf;

216

208

buffer_capacity += BUFFER_SIZE;

217

209

}

218

210

return buffer_capacity;

219

211

}

220

212

221

213

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

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){

214

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

215

int af){

225

216

int ret;

226

217

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

227

218

if(new_server == NULL){

234

225

.af = af };

235

226

if(new_server->ip == NULL){

236

227

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

228

return false;

253

229

}

254

230

/* Special case of first server */

255

if(*current_server == NULL){

231

if (mc.current_server == NULL){

256

232

new_server->next = new_server;

257

233

new_server->prev = new_server;

258

*current_server = new_server;

234

mc.current_server = new_server;

235

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

259

236

} else {

260

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

261

new_server->next = *current_server;

262

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

237

new_server->next = mc.current_server;

238

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

263

239

new_server->prev->next = new_server;

264

(*current_server)->prev = new_server;

240

mc.current_server->prev = new_server;

241

}

242

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

243

if(ret == -1){

244

perror_plus("clock_gettime");

245

return false;

265

246

}

266

247

return true;

267

248

}

269

250

/*

270

251

* Initialize GPGME.

271

252

*/

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

274

const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

253

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

254

const char *tempdir){

277

255

gpgme_error_t rc;

278

256

gpgme_engine_info_t engine_info;

279

257

258

280

259

/*

281

260

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

282

261

*/

283

bool import_key(const char * const filename){

262

bool import_key(const char *filename){

284

263

int ret;

285

264

int fd;

286

265

gpgme_data_t pgp_data;

298

277

return false;

299

278

}

300

279

301

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

280

rc = gpgme_op_import(mc.ctx, pgp_data);

302

281

if(rc != GPG_ERR_NO_ERROR){

303

282

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

304

283

gpgme_strsource(rc), gpgme_strerror(rc));

348

327

}

349

328

350

329

/* Create new GPGME "context" */

351

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

330

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

352

331

if(rc != GPG_ERR_NO_ERROR){

353

332

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

354

333

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

367

346

* Decrypt OpenPGP data.

368

347

* Returns -1 on error

369

348

*/

370

__attribute__((nonnull, warn_unused_result))

371

349

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

350

size_t crypto_size,

373

char **plaintext,

374

mandos_context *mc){

351

char **plaintext){

375

352

gpgme_data_t dh_crypto, dh_plain;

376

353

gpgme_error_t rc;

377

354

ssize_t ret;

403

380

404

381

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

405

382

data buffer */

406

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

383

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

407

384

if(rc != GPG_ERR_NO_ERROR){

408

385

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

409

386

gpgme_strsource(rc), gpgme_strerror(rc));

410

387

plaintext_length = -1;

411

388

if(debug){

412

389

gpgme_decrypt_result_t result;

413

result = gpgme_op_decrypt_result(mc->ctx);

390

result = gpgme_op_decrypt_result(mc.ctx);

414

391

if(result == NULL){

415

392

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

416

393

} else {

493

470

return plaintext_length;

494

471

}

495

472

496

__attribute__((warn_unused_result, const))

497

static const char *safe_string(const char *str){

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

503

__attribute__((warn_unused_result))

504

static const char *safer_gnutls_strerror(int value){

505

const char *ret = gnutls_strerror(value);

506

return safe_string(ret);

473

static const char * safer_gnutls_strerror(int value){

474

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

475

-Wunreachable-code */

476

if(ret == NULL)

477

ret = "(unknown)";

478

return ret;

507

479

}

508

480

509

481

/* GnuTLS log function callback */

510

__attribute__((nonnull))

511

482

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

512

483

const char* string){

513

484

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

514

485

}

515

486

516

__attribute__((nonnull, warn_unused_result))

517

487

static int init_gnutls_global(const char *pubkeyfilename,

518

const char *seckeyfilename,

519

mandos_context *mc){

488

const char *seckeyfilename){

520

489

int ret;

521

unsigned int uret;

522

490

523

491

if(debug){

524

492

fprintf_plus(stderr, "Initializing GnuTLS\n");

540

508

}

541

509

542

510

/* OpenPGP credentials */

543

ret = gnutls_certificate_allocate_credentials(&mc->cred);

511

ret = gnutls_certificate_allocate_credentials(&mc.cred);

544

512

if(ret != GNUTLS_E_SUCCESS){

545

513

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

546

514

safer_gnutls_strerror(ret));

556

524

}

557

525

558

526

ret = gnutls_certificate_set_openpgp_key_file

559

(mc->cred, pubkeyfilename, seckeyfilename,

527

(mc.cred, pubkeyfilename, seckeyfilename,

560

528

GNUTLS_OPENPGP_FMT_BASE64);

561

529

if(ret != GNUTLS_E_SUCCESS){

562

530

fprintf_plus(stderr,

568

536

}

569

537

570

538

/* GnuTLS server initialization */

571

ret = gnutls_dh_params_init(&mc->dh_params);

539

ret = gnutls_dh_params_init(&mc.dh_params);

572

540

if(ret != GNUTLS_E_SUCCESS){

573

541

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

574

542

" initialization: %s\n",

575

543

safer_gnutls_strerror(ret));

576

544

goto globalfail;

577

545

}

578

if(mc->dh_bits == 0){

579

/* Find out the optimal number of DH bits */

580

/* Try to read the private key file */

581

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

582

{

583

int secfile = open(seckeyfilename, O_RDONLY);

584

size_t buffer_capacity = 0;

585

while(true){

586

buffer_capacity = incbuffer((char **)&buffer.data,

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

590

perror_plus("incbuffer");

591

free(buffer.data);

592

buffer.data = NULL;

593

break;

594

}

595

ssize_t bytes_read = read(secfile, buffer.data + buffer.size,

596

BUFFER_SIZE);

597

/* EOF */

598

if(bytes_read == 0){

599

break;

600

}

601

/* check bytes_read for failure */

602

if(bytes_read < 0){

603

perror_plus("read");

604

free(buffer.data);

605

buffer.data = NULL;

606

break;

607

}

608

buffer.size += (unsigned int)bytes_read;

609

}

610

close(secfile);

611

}

612

/* If successful, use buffer to parse private key */

613

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

614

if(buffer.data != NULL){

615

{

616

gnutls_openpgp_privkey_t privkey = NULL;

617

ret = gnutls_openpgp_privkey_init(&privkey);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Error initializing OpenPGP key"

620

" structure: %s", safer_gnutls_strerror(ret));

621

free(buffer.data);

622

buffer.data = NULL;

623

} else {

624

ret = gnutls_openpgp_privkey_import(privkey, &buffer,

625

GNUTLS_OPENPGP_FMT_BASE64,

626

"", 0);

627

if(ret != GNUTLS_E_SUCCESS){

628

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

629

safer_gnutls_strerror(ret));

630

privkey = NULL;

631

}

632

free(buffer.data);

633

buffer.data = NULL;

634

if(privkey != NULL){

635

/* Use private key to suggest an appropriate sec_param */

636

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

637

gnutls_openpgp_privkey_deinit(privkey);

638

if(debug){

639

fprintf_plus(stderr, "This OpenPGP key implies using a"

640

" GnuTLS security parameter \"%s\".\n",

641

safe_string(gnutls_sec_param_get_name

642

(sec_param)));

643

}

644

}

645

}

646

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

650

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

653

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

655

}

656

}

657

}

658

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

659

if(uret != 0){

660

mc->dh_bits = uret;

661

if(debug){

662

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

663

" implies %u DH bits; using that.\n",

664

safe_string(gnutls_sec_param_get_name

665

(sec_param)),

666

mc->dh_bits);

667

}

668

} else {

669

fprintf_plus(stderr, "Failed to get implied number of DH"

670

" bits for security parameter \"%s\"): %s\n",

671

safe_string(gnutls_sec_param_get_name(sec_param)),

672

safer_gnutls_strerror(ret));

673

goto globalfail;

674

}

675

} else if(debug){

676

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

677

mc->dh_bits);

678

}

679

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

546

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

680

547

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"

682

" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));

548

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

549

safer_gnutls_strerror(ret));

683

550

goto globalfail;

684

551

}

685

552

686

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

553

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

687

554

688

555

return 0;

689

556

690

557

globalfail:

691

558

692

gnutls_certificate_free_credentials(mc->cred);

559

gnutls_certificate_free_credentials(mc.cred);

693

560

gnutls_global_deinit();

694

gnutls_dh_params_deinit(mc->dh_params);

561

gnutls_dh_params_deinit(mc.dh_params);

695

562

return -1;

696

563

}

697

564

698

__attribute__((nonnull, warn_unused_result))

699

static int init_gnutls_session(gnutls_session_t *session,

700

mandos_context *mc){

565

static int init_gnutls_session(gnutls_session_t *session){

701

566

int ret;

702

567

/* GnuTLS session creation */

703

568

do {

715

580

{

716

581

const char *err;

717

582

do {

718

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

583

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

719

584

if(quit_now){

720

585

gnutls_deinit(*session);

721

586

return -1;

732

597

733

598

do {

734

599

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

735

mc->cred);

600

mc.cred);

736

601

if(quit_now){

737

602

gnutls_deinit(*session);

738

603

return -1;

748

613

/* ignore client certificate if any. */

749

614

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

750

615

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

616

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

752

617

753

618

return 0;

754

619

}

758

623

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

759

624

760

625

/* Called when a Mandos server is found */

761

__attribute__((nonnull, warn_unused_result))

762

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

626

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

763

627

AvahiIfIndex if_index,

764

int af, mandos_context *mc){

628

int af){

765

629

int ret, tcp_sd = -1;

766

630

ssize_t sret;

767

struct sockaddr_storage to;

631

union {

632

struct sockaddr_in in;

633

struct sockaddr_in6 in6;

634

} to;

768

635

char *buffer = NULL;

769

636

char *decrypted_buffer = NULL;

770

637

size_t buffer_length = 0;

794

661

return -1;

795

662

}

796

663

797

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

798

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

799

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

800

bool match = false;

801

{

802

char *interface = NULL;

803

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

804

interface))){

805

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

806

match = true;

807

break;

808

}

809

}

810

}

811

if(not match){

812

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

813

connect to the server */

814

if(debug){

815

char interface[IF_NAMESIZE];

816

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

817

perror_plus("if_indextoname");

818

} else {

819

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

820

" \"%s\"\n",

821

if_indextoname((unsigned int)if_index,

822

interface));

823

}

824

}

825

return -1;

826

}

827

}

828

829

ret = init_gnutls_session(&session, mc);

664

ret = init_gnutls_session(&session);

830

665

if(ret != 0){

831

666

return -1;

832

667

}

833

668

834

669

if(debug){

835

670

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

836

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

671

PRIu16 "\n", ip, port);

837

672

}

838

673

839

674

tcp_sd = socket(pf, SOCK_STREAM, 0);

851

686

852

687

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

853

688

if(af == AF_INET6){

854

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

855

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

689

to.in6.sin6_family = (sa_family_t)af;

690

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

856

691

} else { /* IPv4 */

857

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

858

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

692

to.in.sin_family = (sa_family_t)af;

693

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

859

694

}

860

695

if(ret < 0 ){

861

696

int e = errno;

870

705

goto mandos_end;

871

706

}

872

707

if(af == AF_INET6){

873

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

874

if(IN6_IS_ADDR_LINKLOCAL

875

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

708

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

709

-Wconversion and

710

-Wunreachable-code */

711

712

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

713

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

714

-Wunreachable-code*/

876

715

if(if_index == AVAHI_IF_UNSPEC){

877

716

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

878

717

" incomplete without a network interface\n");

880

719

goto mandos_end;

881

720

}

882

721

/* Set the network interface number as scope */

883

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

722

to.in6.sin6_scope_id = (uint32_t)if_index;

884

723

}

885

724

} else {

886

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

725

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

726

-Wconversion and

727

-Wunreachable-code */

887

728

}

888

729

889

730

if(quit_now){

897

738

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

898

739

perror_plus("if_indextoname");

899

740

} else {

900

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

901

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

741

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

742

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

902

743

}

903

744

} else {

904

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

905

ip, (uintmax_t)port);

745

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

746

ip, port);

906

747

}

907

748

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

908

749

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

const char *pcret;

909

751

if(af == AF_INET6){

910

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

911

sizeof(struct sockaddr_in6),

912

addrstr, sizeof(addrstr), NULL, 0,

913

NI_NUMERICHOST);

752

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

753

sizeof(addrstr));

914

754

} else {

915

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

916

sizeof(struct sockaddr_in),

917

addrstr, sizeof(addrstr), NULL, 0,

918

NI_NUMERICHOST);

755

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

756

sizeof(addrstr));

919

757

}

920

if(ret == EAI_SYSTEM){

921

perror_plus("getnameinfo");

922

} else if(ret != 0) {

923

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

924

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

925

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

758

if(pcret == NULL){

759

perror_plus("inet_ntop");

760

} else {

761

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

762

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

763

}

926

764

}

927

765

}

928

766

932

770

}

933

771

934

772

if(af == AF_INET6){

935

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

936

sizeof(struct sockaddr_in6));

773

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

937

774

} else {

938

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

939

sizeof(struct sockaddr_in));

775

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

940

776

}

941

777

if(ret < 0){

942

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

778

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

943

779

int e = errno;

944

780

perror_plus("connect");

945

781

errno = e;

1106

942

if(buffer_length > 0){

1107

943

ssize_t decrypted_buffer_size;

1108

944

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1109

&decrypted_buffer, mc);

945

&decrypted_buffer);

1110

946

if(decrypted_buffer_size >= 0){

1111

947

1112

948

written = 0;

1160

996

return retval;

1161

997

}

1162

998

1163

__attribute__((nonnull))

1164

999

static void resolve_callback(AvahiSServiceResolver *r,

1165

1000

AvahiIfIndex interface,

1166

1001

AvahiProtocol proto,

1174

1009

AVAHI_GCC_UNUSED AvahiStringList *txt,

1175

1010

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1176

1011

flags,

1177

void *mc){

1178

if(r == NULL){

1179

return;

1180

}

1012

AVAHI_GCC_UNUSED void* userdata){

1013

assert(r);

1181

1014

1182

1015

/* Called whenever a service has been resolved successfully or

1183

1016

timed out */

1184

1017

1185

1018

if(quit_now){

1186

avahi_s_service_resolver_free(r);

1187

1019

return;

1188

1020

}

1189

1021

1193

1025

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

1194

1026

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

1195

1027

domain,

1196

avahi_strerror(avahi_server_errno

1197

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

1028

avahi_strerror(avahi_server_errno(mc.server)));

1198

1029

break;

1199

1030

1200

1031

case AVAHI_RESOLVER_FOUND:

1206

1037

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

1207

1038

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

1208

1039

}

1209

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

1210

interface,

1211

avahi_proto_to_af(proto),

1212

mc);

1040

int ret = start_mandos_communication(ip, port, interface,

1041

avahi_proto_to_af(proto));

1213

1042

if(ret == 0){

1214

avahi_simple_poll_quit(simple_poll);

1043

avahi_simple_poll_quit(mc.simple_poll);

1215

1044

} else {

1216

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

1217

avahi_proto_to_af(proto),

1218

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

1045

if(not add_server(ip, port, interface,

1046

avahi_proto_to_af(proto))){

1219

1047

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

1220

1048

" list\n", name);

1221

1049

}

1234

1062

const char *domain,

1235

1063

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1236

1064

flags,

1237

void *mc){

1238

if(b == NULL){

1239

return;

1240

}

1065

AVAHI_GCC_UNUSED void* userdata){

1066

assert(b);

1241

1067

1242

1068

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

1243

1069

is removed from the LAN */

1251

1077

case AVAHI_BROWSER_FAILURE:

1252

1078

1253

1079

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

1254

avahi_strerror(avahi_server_errno

1255

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

1256

avahi_simple_poll_quit(simple_poll);

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1257

1082

return;

1258

1083

1259

1084

case AVAHI_BROWSER_NEW:

1262

1087

the callback function is called the Avahi server will free the

1263

1088

resolver for us. */

1264

1089

1265

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

1266

interface, protocol, name, type,

1267

domain, protocol, 0,

1268

resolve_callback, mc) == NULL)

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1269

1093

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

1270

1094

" %s\n", name,

1271

avahi_strerror(avahi_server_errno

1272

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

1095

avahi_strerror(avahi_server_errno(mc.server)));

1273

1096

break;

1274

1097

1275

1098

case AVAHI_BROWSER_REMOVE:

1294

1117

signal_received = sig;

1295

1118

int old_errno = errno;

1296

1119

/* set main loop to exit */

1297

if(simple_poll != NULL){

1298

avahi_simple_poll_quit(simple_poll);

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1299

1122

}

1300

1123

errno = old_errno;

1301

1124

}

1302

1125

1303

__attribute__((nonnull, warn_unused_result))

1304

1126

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

1305

1127

int ret;

1306

1128

error_t ret_errno;

1325

1147

return true;

1326

1148

}

1327

1149

1328

__attribute__((nonnull, warn_unused_result))

1329

1150

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

1330

1151

1331

1152

/* Reject the loopback device */

1373

1194

* corresponds to an acceptable network device.

1374

1195

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

1375

1196

*/

1376

__attribute__((nonnull, warn_unused_result))

1377

1197

int good_interface(const struct dirent *if_entry){

1378

1198

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

1379

1199

return 0;

1397

1217

/*

1398

1218

* This function determines if a network interface is up.

1399

1219

*/

1400

__attribute__((nonnull, warn_unused_result))

1401

1220

bool interface_is_up(const char *interface){

1402

1221

struct ifreq ifr;

1403

1222

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

1414

1233

/*

1415

1234

* This function determines if a network interface is running

1416

1235

*/

1417

__attribute__((nonnull, warn_unused_result))

1418

1236

bool interface_is_running(const char *interface){

1419

1237

struct ifreq ifr;

1420

1238

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

1428

1246

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

1429

1247

}

1430

1248

1431

__attribute__((nonnull, pure, warn_unused_result))

1432

1249

int notdotentries(const struct dirent *direntry){

1433

1250

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

1434

1251

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

1441

1258

}

1442

1259

1443

1260

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

1444

__attribute__((nonnull, warn_unused_result))

1445

1261

int runnable_hook(const struct dirent *direntry){

1446

1262

int ret;

1447

1263

size_t sret;

1455

1271

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

1456

1272

"abcdefghijklmnopqrstuvwxyz"

1457

1273

"0123456789"

1458

"_.-");

1274

"_-");

1459

1275

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

1460

1276

/* Contains non-allowed characters */

1461

1277

if(debug){

1465

1281

return 0;

1466

1282

}

1467

1283

1468

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

1284

char *fullname = NULL;

1285

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

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1469

1292

if(ret == -1){

1470

1293

if(debug){

1471

1294

perror_plus("Could not stat hook");

1495

1318

return 1;

1496

1319

}

1497

1320

1498

__attribute__((nonnull, warn_unused_result))

1499

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1500

mandos_context *mc){

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1501

1322

int ret;

1502

1323

struct timespec now;

1503

1324

struct timespec waited_time;

1504

1325

intmax_t block_time;

1505

1326

1506

1327

while(true){

1507

if(mc->current_server == NULL){

1508

if(debug){

1328

if(mc.current_server == NULL){

1329

if (debug){

1509

1330

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

1510

1331

" No timeout!\n");

1511

1332

}

1512

1333

ret = avahi_simple_poll_iterate(s, -1);

1513

1334

} else {

1514

if(debug){

1335

if (debug){

1515

1336

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

1516

1337

" it, or wait\n");

1517

1338

}

1524

1345

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

1525

1346

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

1526

1347

waited_time.tv_sec = (now.tv_sec

1527

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

1348

- mc.current_server->last_seen.tv_sec);

1528

1349

waited_time.tv_nsec = (now.tv_nsec

1529

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

1350

- mc.current_server->last_seen.tv_nsec);

1530

1351

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

1531

1352

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

1532

1353

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

1534

1355

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

1535

1356

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

1536

1357

1537

if(debug){

1358

if (debug){

1538

1359

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

1539

1360

block_time);

1540

1361

}

1541

1362

1542

1363

if(block_time <= 0){

1543

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

1544

mc->current_server->port,

1545

mc->current_server->if_index,

1546

mc->current_server->af, mc);

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1547

1368

if(ret == 0){

1548

avahi_simple_poll_quit(s);

1369

avahi_simple_poll_quit(mc.simple_poll);

1549

1370

return 0;

1550

1371

}

1551

1372

ret = clock_gettime(CLOCK_MONOTONIC,

1552

&mc->current_server->last_seen);

1373

&mc.current_server->last_seen);

1553

1374

if(ret == -1){

1554

1375

perror_plus("clock_gettime");

1555

1376

return -1;

1556

1377

}

1557

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

1378

mc.current_server = mc.current_server->next;

1558

1379

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

1559

1380

servers, but don't block */

1560

1381

}

1562

1383

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

1563

1384

}

1564

1385

if(ret != 0){

1565

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

1386

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

1566

1387

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

1567

1388

}

1568

1389

}

1570

1391

}

1571

1392

1572

1393

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

1573

__attribute__((warn_unused_result))

1574

1394

error_t raise_privileges(void){

1575

1395

error_t old_errno = errno;

1576

1396

error_t ret_errno = 0;

1577

1397

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

1578

1398

ret_errno = errno;

1399

perror_plus("seteuid");

1579

1400

}

1580

1401

errno = old_errno;

1581

1402

return ret_errno;

1582

1403

}

1583

1404

1584

1405

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

1585

__attribute__((warn_unused_result))

1586

1406

error_t raise_privileges_permanently(void){

1587

1407

error_t old_errno = errno;

1588

1408

error_t ret_errno = raise_privileges();

1592

1412

}

1593

1413

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

1594

1414

ret_errno = errno;

1415

perror_plus("seteuid");

1595

1416

}

1596

1417

errno = old_errno;

1597

1418

return ret_errno;

1598

1419

}

1599

1420

1600

1421

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

1601

__attribute__((warn_unused_result))

1602

1422

error_t lower_privileges(void){

1603

1423

error_t old_errno = errno;

1604

1424

error_t ret_errno = 0;

1605

1425

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

1606

1426

ret_errno = errno;

1427

perror_plus("seteuid");

1607

1428

}

1608

1429

errno = old_errno;

1609

1430

return ret_errno;

1610

1431

}

1611

1432

1612

1433

/* Lower privileges permanently */

1613

__attribute__((warn_unused_result))

1614

1434

error_t lower_privileges_permanently(void){

1615

1435

error_t old_errno = errno;

1616

1436

error_t ret_errno = 0;

1617

1437

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

1618

1438

ret_errno = errno;

1439

perror_plus("setuid");

1619

1440

}

1620

1441

errno = old_errno;

1621

1442

return ret_errno;

1622

1443

}

1623

1444

1624

__attribute__((nonnull))

1625

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

1445

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

1626

1446

const float delay){

1627

struct dirent **direntries = NULL;

1628

if(hookdir_fd == -1){

1629

hookdir_fd = open(hookdir, O_RDONLY);

1630

if(hookdir_fd == -1){

1631

if(errno == ENOENT){

1632

if(debug){

1633

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

1634

" found\n", hookdir);

1635

}

1636

} else {

1637

perror_plus("open");

1638

}

1639

return;

1640

}

1641

}

1642

#ifdef __GLIBC__

1643

#if __GLIBC_PREREQ(2, 15)

1644

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

1645

runnable_hook, alphasort);

1646

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

1647

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

1648

alphasort);

1649

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

1650

#else /* not __GLIBC__ */

1651

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

1652

alphasort);

1653

#endif /* not __GLIBC__ */

1447

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

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

1451

alphasort);

1654

1452

if(numhooks == -1){

1655

1453

perror_plus("scandir");

1656

return;

1657

}

1658

struct dirent *direntry;

1659

int ret;

1660

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

1661

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

1662

direntry = direntries[i];

1663

if(debug){

1664

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

1665

direntry->d_name);

1666

}

1667

pid_t hook_pid = fork();

1668

if(hook_pid == 0){

1669

/* Child */

1670

/* Raise privileges */

1671

errno = raise_privileges_permanently();

1672

if(errno != 0){

1673

perror_plus("Failed to raise privileges");

1674

_exit(EX_NOPERM);

1675

}

1676

/* Set group */

1677

errno = 0;

1678

ret = setgid(0);

1679

if(ret == -1){

1680

perror_plus("setgid");

1681

_exit(EX_NOPERM);

1682

}

1683

/* Reset supplementary groups */

1684

errno = 0;

1685

ret = setgroups(0, NULL);

1686

if(ret == -1){

1687

perror_plus("setgroups");

1688

_exit(EX_NOPERM);

1689

}

1690

ret = dup2(devnull, STDIN_FILENO);

1691

if(ret == -1){

1692

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

1693

_exit(EX_OSERR);

1694

}

1695

ret = close(devnull);

1696

if(ret == -1){

1697

perror_plus("close");

1698

_exit(EX_OSERR);

1699

}

1700

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1701

if(ret == -1){

1702

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

1703

_exit(EX_OSERR);

1704

}

1705

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

1706

if(ret == -1){

1707

perror_plus("setenv");

1708

_exit(EX_OSERR);

1709

}

1710

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

1711

if(ret == -1){

1712

perror_plus("setenv");

1713

_exit(EX_OSERR);

1714

}

1715

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

1716

if(ret == -1){

1717

perror_plus("setenv");

1718

_exit(EX_OSERR);

1719

}

1720

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

1721

if(ret == -1){

1722

perror_plus("setenv");

1723

_exit(EX_OSERR);

1724

}

1725

char *delaystring;

1726

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

1727

if(ret == -1){

1454

} else {

1455

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

1456

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

1457

direntry = direntries[i];

1458

char *fullname = NULL;

1459

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

1460

if(ret < 0){

1728

1461

perror_plus("asprintf");

1729

_exit(EX_OSERR);

1730

}

1731

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

1732

if(ret == -1){

1462

continue;

1463

}

1464

if(debug){

1465

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

1466

direntry->d_name);

1467

}

1468

pid_t hook_pid = fork();

1469

if(hook_pid == 0){

1470

/* Child */

1471

/* Raise privileges */

1472

raise_privileges_permanently();

1473

/* Set group */

1474

errno = 0;

1475

ret = setgid(0);

1476

if(ret == -1){

1477

perror_plus("setgid");

1478

}

1479

/* Reset supplementary groups */

1480

errno = 0;

1481

ret = setgroups(0, NULL);

1482

if(ret == -1){

1483

perror_plus("setgroups");

1484

}

1485

dup2(devnull, STDIN_FILENO);

1486

close(devnull);

1487

dup2(STDERR_FILENO, STDOUT_FILENO);

1488

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

1489

if(ret == -1){

1490

perror_plus("setenv");

1491

_exit(EX_OSERR);

1492

}

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

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

1499

if(ret == -1){

1500

perror_plus("setenv");

1501

_exit(EX_OSERR);

1502

}

1503

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

1504

if(ret == -1){

1505

perror_plus("setenv");

1506

_exit(EX_OSERR);

1507

}

1508

char *delaystring;

1509

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

1510

if(ret == -1){

1511

perror_plus("asprintf");

1512

_exit(EX_OSERR);

1513

}

1514

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

1515

if(ret == -1){

1516

free(delaystring);

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1733

1520

free(delaystring);

1734

perror_plus("setenv");

1735

_exit(EX_OSERR);

1736

}

1737

free(delaystring);

1738

if(connect_to != NULL){

1739

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

1740

if(ret == -1){

1741

perror_plus("setenv");

1742

_exit(EX_OSERR);

1743

}

1744

}

1745

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

1746

if(hook_fd == -1){

1747

perror_plus("openat");

1748

_exit(EXIT_FAILURE);

1749

}

1750

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

1751

perror_plus("close");

1752

_exit(EXIT_FAILURE);

1753

}

1754

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

1755

environ) == -1){

1756

perror_plus("fexecve");

1757

_exit(EXIT_FAILURE);

1758

}

1759

} else {

1760

if(hook_pid == -1){

1761

perror_plus("fork");

1762

free(direntry);

1763

continue;

1764

}

1765

int status;

1766

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

1767

perror_plus("waitpid");

1768

free(direntry);

1769

continue;

1770

}

1771

if(WIFEXITED(status)){

1772

if(WEXITSTATUS(status) != 0){

1773

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

1774

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

1775

WEXITSTATUS(status));

1776

free(direntry);

1777

continue;

1778

}

1779

} else if(WIFSIGNALED(status)){

1780

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

1781

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

1782

WTERMSIG(status));

1783

free(direntry);

1784

continue;

1521

if(connect_to != NULL){

1522

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

1523

if(ret == -1){

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

1527

}

1528

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

1529

perror_plus("execl");

1530

_exit(EXIT_FAILURE);

1531

}

1785

1532

} else {

1786

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

1787

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

1788

free(direntry);

1789

continue;

1790

}

1791

}

1792

if(debug){

1793

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

1794

direntry->d_name);

1795

}

1796

free(direntry);

1797

}

1798

free(direntries);

1799

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

1800

perror_plus("close");

1801

} else {

1802

hookdir_fd = -1;

1803

}

1804

close(devnull);

1533

int status;

1534

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

1535

perror_plus("waitpid");

1536

free(fullname);

1537

continue;

1538

}

1539

if(WIFEXITED(status)){

1540

if(WEXITSTATUS(status) != 0){

1541

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

1542

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

1543

WEXITSTATUS(status));

1544

free(fullname);

1545

continue;

1546

}

1547

} else if(WIFSIGNALED(status)){

1548

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

1549

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

1550

WTERMSIG(status));

1551

free(fullname);

1552

continue;

1553

} else {

1554

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

1555

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

1556

free(fullname);

1557

continue;

1558

}

1559

}

1560

free(fullname);

1561

if(debug){

1562

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

1563

direntry->d_name);

1564

}

1565

}

1566

close(devnull);

1567

}

1568

return true;

1805

1569

}

1806

1570

1807

__attribute__((nonnull, warn_unused_result))

1808

1571

error_t bring_up_interface(const char *const interface,

1809

1572

const float delay){

1573

int sd = -1;

1810

1574

error_t old_errno = errno;

1811

int ret;

1575

error_t ret_errno = 0;

1576

int ret, ret_setflags;

1812

1577

struct ifreq network;

1813

1578

unsigned int if_index = if_nametoindex(interface);

1814

1579

if(if_index == 0){

1823

1588

}

1824

1589

1825

1590

if(not interface_is_up(interface)){

1826

error_t ret_errno = 0, ioctl_errno = 0;

1827

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

1591

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

1828

1592

ret_errno = errno;

1829

1593

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

1830

1594

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

1831

errno = old_errno;

1832

1595

return ret_errno;

1833

1596

}

1834

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

1597

network.ifr_flags |= IFF_UP;

1835

1598

1836

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

1837

if(sd == -1){

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

1838

1601

ret_errno = errno;

1839

1602

perror_plus("socket");

1840

1603

errno = old_errno;

1841

1604

return ret_errno;

1842

1605

}

1843

1606

1844

1607

if(quit_now){

1845

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

1846

if(ret == -1){

1847

perror_plus("close");

1848

}

1608

close(sd);

1849

1609

errno = old_errno;

1850

1610

return EINTR;

1851

1611

}

1855

1615

interface);

1856

1616

}

1857

1617

1858

/* Raise privileges */

1859

ret_errno = raise_privileges();

1860

if(ret_errno != 0){

1861

errno = ret_errno;

1862

perror_plus("Failed to raise privileges");

1863

}

1618

/* Raise priviliges */

1619

raise_privileges();

1864

1620

1865

1621

#ifdef __linux__

1866

int ret_linux;

1867

bool restore_loglevel = false;

1868

if(ret_errno == 0){

1869

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1870

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

1871

ret_linux = klogctl(8, NULL, 5);

1872

if(ret_linux == -1){

1873

perror_plus("klogctl");

1874

} else {

1875

restore_loglevel = true;

1876

}

1622

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1623

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

1624

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

1625

bool restore_loglevel = true;

1626

if(ret_linux == -1){

1627

restore_loglevel = false;

1628

perror_plus("klogctl");

1877

1629

}

1878

1630

#endif /* __linux__ */

1879

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

1880

ioctl_errno = errno;

1631

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

1632

ret_errno = errno;

1881

1633

#ifdef __linux__

1882

1634

if(restore_loglevel){

1883

1635

ret_linux = klogctl(7, NULL, 0);

1887

1639

}

1888

1640

#endif /* __linux__ */

1889

1641

1890

/* If raise_privileges() succeeded above */

1891

if(ret_errno == 0){

1892

/* Lower privileges */

1893

ret_errno = lower_privileges();

1894

if(ret_errno != 0){

1895

errno = ret_errno;

1896

perror_plus("Failed to lower privileges");

1897

}

1898

}

1642

/* Lower privileges */

1643

lower_privileges();

1899

1644

1900

1645

/* Close the socket */

1901

1646

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

1904

1649

}

1905

1650

1906

1651

if(ret_setflags == -1){

1907

errno = ioctl_errno;

1652

errno = ret_errno;

1908

1653

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1909

1654

errno = old_errno;

1910

return ioctl_errno;

1655

return ret_errno;

1911

1656

}

1912

1657

} else if(debug){

1913

1658

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

1931

1676

return 0;

1932

1677

}

1933

1678

1934

__attribute__((nonnull, warn_unused_result))

1935

1679

error_t take_down_interface(const char *const interface){

1680

int sd = -1;

1936

1681

error_t old_errno = errno;

1682

error_t ret_errno = 0;

1683

int ret, ret_setflags;

1937

1684

struct ifreq network;

1938

1685

unsigned int if_index = if_nametoindex(interface);

1939

1686

if(if_index == 0){

1942

1689

return ENXIO;

1943

1690

}

1944

1691

if(interface_is_up(interface)){

1945

error_t ret_errno = 0, ioctl_errno = 0;

1946

1692

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

1947

1693

ret_errno = errno;

1948

1694

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

1949

1695

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

1950

errno = old_errno;

1951

1696

return ret_errno;

1952

1697

}

1953

1698

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

1954

1699

1955

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

1956

if(sd == -1){

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

1957

1702

ret_errno = errno;

1958

1703

perror_plus("socket");

1959

1704

errno = old_errno;

1965

1710

interface);

1966

1711

}

1967

1712

1968

/* Raise privileges */

1969

ret_errno = raise_privileges();

1970

if(ret_errno != 0){

1971

errno = ret_errno;

1972

perror_plus("Failed to raise privileges");

1973

}

1974

1975

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

1976

ioctl_errno = errno;

1977

1978

/* If raise_privileges() succeeded above */

1979

if(ret_errno == 0){

1980

/* Lower privileges */

1981

ret_errno = lower_privileges();

1982

if(ret_errno != 0){

1983

errno = ret_errno;

1984

perror_plus("Failed to lower privileges");

1985

}

1986

}

1713

/* Raise priviliges */

1714

raise_privileges();

1715

1716

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

1717

ret_errno = errno;

1718

1719

/* Lower privileges */

1720

lower_privileges();

1987

1721

1988

1722

/* Close the socket */

1989

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

1723

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

1990

1724

if(ret == -1){

1991

1725

perror_plus("close");

1992

1726

}

1993

1727

1994

1728

if(ret_setflags == -1){

1995

errno = ioctl_errno;

1729

errno = ret_errno;

1996

1730

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1997

1731

errno = old_errno;

1998

return ioctl_errno;

1732

return ret_errno;

1999

1733

}

2000

1734

} else if(debug){

2001

1735

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

2007

1741

}

2008

1742

2009

1743

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

2010

mandos_context mc = { .server = NULL, .dh_bits = 0,

2011

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

2012

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

2013

.interfaces = NULL, .interfaces_size = 0 };

2014

1744

AvahiSServiceBrowser *sb = NULL;

2015

1745

error_t ret_errno;

2016

1746

int ret;

2017

1747

intmax_t tmpmax;

2018

1748

char *tmp;

2019

1749

int exitcode = EXIT_SUCCESS;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

2020

1752

char *interfaces_to_take_down = NULL;

2021

1753

size_t interfaces_to_take_down_size = 0;

2022

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

2023

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

2024

char *tempdir = NULL;

1754

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

1755

bool tempdir_created = false;

2025

1756

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2026

1757

const char *seckey = PATHDIR "/" SECKEY;

2027

1758

const char *pubkey = PATHDIR "/" PUBKEY;

2028

1759

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

2029

1761

2030

1762

bool gnutls_initialized = false;

2031

1763

bool gpgme_initialized = false;

2122

1854

connect_to = arg;

2123

1855

break;

2124

1856

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

2125

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

2126

arg, (int)',');

1857

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

1858

(int)',');

2127

1859

if(ret_errno != 0){

2128

1860

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

2129

1861

}

2209

1941

/* Work around Debian bug #633582:

2210

1942

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

2211

1943

2212

/* Re-raise privileges */

2213

ret_errno = raise_privileges();

2214

if(ret_errno != 0){

2215

errno = ret_errno;

2216

perror_plus("Failed to raise privileges");

2217

} else {

1944

/* Re-raise priviliges */

1945

if(raise_privileges() == 0){

2218

1946

struct stat st;

2219

1947

2220

1948

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

2260

1988

}

2261

1989

2262

1990

/* Lower privileges */

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2266

perror_plus("Failed to lower privileges");

1991

errno = 0;

1992

ret = seteuid(uid);

1993

if(ret == -1){

1994

perror_plus("seteuid");

2267

1995

}

2268

1996

}

2269

1997

}

2270

1998

2271

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

1999

/* Remove empty interface names */

2272

2000

{

2273

2001

char *interface = NULL;

2274

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

2002

while((interface = argz_next(interfaces, interfaces_size,

2275

2003

interface))){

2276

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

2277

and if_nametoindex(interface) == 0){

2278

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

2004

if(if_nametoindex(interface) == 0){

2005

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

2279

2006

fprintf_plus(stderr, "Not using nonexisting interface"

2280

2007

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

2281

2008

}

2282

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

2009

argz_delete(&interfaces, &interfaces_size, interface);

2283

2010

interface = NULL;

2284

2011

}

2285

2012

}

2287

2014

2288

2015

/* Run network hooks */

2289

2016

{

2290

if(mc.interfaces != NULL){

2291

interfaces_hooks = malloc(mc.interfaces_size);

2292

if(interfaces_hooks == NULL){

2293

perror_plus("malloc");

2294

goto end;

2295

}

2296

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

2297

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

2298

}

2299

run_network_hooks("start", interfaces_hooks != NULL ?

2300

interfaces_hooks : "", delay);

2017

ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,

2018

interfaces, interfaces_size);

2019

if(ret_errno != 0){

2020

errno = ret_errno;

2021

perror_plus("argz_append");

2022

goto end;

2023

}

2024

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

2025

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

2026

goto end;

2027

}

2301

2028

}

2302

2029

2303

2030

if(not debug){

2308

2035

from the signal handler */

2309

2036

/* Initialize the pseudo-RNG for Avahi */

2310

2037

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

2311

simple_poll = avahi_simple_poll_new();

2312

if(simple_poll == NULL){

2038

mc.simple_poll = avahi_simple_poll_new();

2039

if(mc.simple_poll == NULL){

2313

2040

fprintf_plus(stderr,

2314

2041

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

2315

2042

exitcode = EX_UNAVAILABLE;

2380

2107

}

2381

2108

2382

2109

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

2383

if(mc.interfaces == NULL){

2384

struct dirent **direntries = NULL;

2110

if(interfaces == NULL){

2111

struct dirent **direntries;

2385

2112

/* Look for any good interfaces */

2386

2113

ret = scandir(sys_class_net, &direntries, good_interface,

2387

2114

alphasort);

2388

2115

if(ret >= 1){

2389

2116

/* Add all found interfaces to interfaces list */

2390

2117

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

2391

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

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2392

2119

direntries[i]->d_name);

2393

2120

if(ret_errno != 0){

2394

errno = ret_errno;

2395

2121

perror_plus("argz_add");

2396

free(direntries[i]);

2397

2122

continue;

2398

2123

}

2399

2124

if(debug){

2400

2125

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

2401

2126

direntries[i]->d_name);

2402

2127

}

2403

free(direntries[i]);

2404

2128

}

2405

2129

free(direntries);

2406

2130

} else {

2407

if(ret == 0){

2408

free(direntries);

2409

}

2131

free(direntries);

2410

2132

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

2411

2133

exitcode = EXIT_FAILURE;

2412

2134

goto end;

2413

2135

}

2414

2136

}

2415

2137

2416

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

2417

{

2138

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

2139

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

2140

if(debug){

2141

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

2142

interfaces);

2143

}

2144

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2145

}

2146

2147

/* Bring up interfaces which are down */

2148

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

2149

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

2418

2150

char *interface = NULL;

2419

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

2151

while((interface = argz_next(interfaces, interfaces_size,

2420

2152

interface))){

2421

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

2422

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

2423

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

2424

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

2425

interface);

2426

interface = NULL;

2427

while((interface = argz_next(mc.interfaces,

2428

mc.interfaces_size, interface))){

2429

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

2430

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

2431

interface);

2432

interface = NULL;

2433

}

2434

}

2435

break;

2436

}

2437

2153

bool interface_was_up = interface_is_up(interface);

2438

errno = bring_up_interface(interface, delay);

2154

ret = bring_up_interface(interface, delay);

2439

2155

if(not interface_was_up){

2440

if(errno != 0){

2156

if(ret != 0){

2157

errno = ret;

2441

2158

perror_plus("Failed to bring up interface");

2442

2159

} else {

2443

errno = argz_add(&interfaces_to_take_down,

2444

&interfaces_to_take_down_size,

2445

interface);

2446

if(errno != 0){

2447

perror_plus("argz_add");

2448

}

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2449

2163

}

2450

2164

}

2451

2165

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2452

2169

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

2453

2170

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

2454

2171

}

2455

2172

}

2456

2173

2457

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

2458

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

2459

if(debug){

2460

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

2461

mc.interfaces);

2462

}

2463

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

2464

}

2465

2466

2174

if(quit_now){

2467

2175

goto end;

2468

2176

}

2469

2177

2470

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

2178

ret = init_gnutls_global(pubkey, seckey);

2471

2179

if(ret == -1){

2472

2180

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

2473

2181

exitcode = EX_UNAVAILABLE;

2480

2188

goto end;

2481

2189

}

2482

2190

2483

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

2484

tempdir = mkdtemp(run_tempdir);

2485

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

2486

if(debug){

2487

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

2488

run_tempdir, old_tempdir);

2489

}

2490

tempdir = mkdtemp(old_tempdir);

2491

}

2492

if(tempdir == NULL){

2191

if(mkdtemp(tempdir) == NULL){

2493

2192

perror_plus("mkdtemp");

2494

2193

goto end;

2495

2194

}

2195

tempdir_created = true;

2496

2196

2497

2197

if(quit_now){

2498

2198

goto end;

2499

2199

}

2500

2200

2501

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

2201

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

2502

2202

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

2503

2203

exitcode = EX_UNAVAILABLE;

2504

2204

goto end;

2525

2225

goto end;

2526

2226

}

2527

2227

2528

in_port_t port;

2228

uint16_t port;

2529

2229

errno = 0;

2530

2230

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

2531

2231

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

2532

or tmpmax != (in_port_t)tmpmax){

2232

or tmpmax != (uint16_t)tmpmax){

2533

2233

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

2534

2234

exitcode = EX_USAGE;

2535

2235

goto end;

2536

2236

}

2537

2237

2538

2238

if(quit_now){

2539

2239

goto end;

2540

2240

}

2541

2241

2542

port = (in_port_t)tmpmax;

2242

port = (uint16_t)tmpmax;

2543

2243

*address = '\0';

2544

2244

/* Colon in address indicates IPv6 */

2545

2245

int af;

2561

2261

}

2562

2262

2563

2263

while(not quit_now){

2564

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

2565

&mc);

2264

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

2566

2265

if(quit_now or ret == 0){

2567

2266

break;

2568

2267

}

2570

2269

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

2571

2270

(int)retry_interval);

2572

2271

}

2573

sleep((unsigned int)retry_interval);

2272

sleep((int)retry_interval);

2574

2273

}

2575

2274

2576

if(not quit_now){

2275

if (not quit_now){

2577

2276

exitcode = EXIT_SUCCESS;

2578

2277

}

2579

2278

2594

2293

config.publish_domain = 0;

2595

2294

2596

2295

/* Allocate a new server */

2597

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2598

&config, NULL, NULL, &ret_errno);

2296

mc.server = avahi_server_new(avahi_simple_poll_get

2297

(mc.simple_poll), &config, NULL,

2298

NULL, &ret_errno);

2599

2299

2600

2300

/* Free the Avahi configuration data */

2601

2301

avahi_server_config_free(&config);

2616

2316

/* Create the Avahi service browser */

2617

2317

sb = avahi_s_service_browser_new(mc.server, if_index,

2618

2318

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2619

NULL, 0, browse_callback,

2620

(void *)&mc);

2319

NULL, 0, browse_callback, NULL);

2621

2320

if(sb == NULL){

2622

2321

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

2623

2322

avahi_strerror(avahi_server_errno(mc.server)));

2634

2333

if(debug){

2635

2334

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

2636

2335

}

2637

2638

ret = avahi_loop_with_timeout(simple_poll,

2639

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

2336

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

2338

(int)(retry_interval * 1000));

2640

2339

if(debug){

2641

2340

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

2642

2341

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

2649

2348

}

2650

2349

2651

2350

/* Cleanup things */

2652

free(mc.interfaces);

2653

2654

2351

if(sb != NULL)

2655

2352

avahi_s_service_browser_free(sb);

2656

2353

2657

2354

if(mc.server != NULL)

2658

2355

avahi_server_free(mc.server);

2659

2356

2660

if(simple_poll != NULL)

2661

avahi_simple_poll_free(simple_poll);

2357

if(mc.simple_poll != NULL)

2358

avahi_simple_poll_free(mc.simple_poll);

2662

2359

2663

2360

if(gnutls_initialized){

2664

2361

gnutls_certificate_free_credentials(mc.cred);

2676

2373

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

2677

2374

while(mc.current_server != NULL){

2678

2375

server *next = mc.current_server->next;

2679

#ifdef __GNUC__

2680

#pragma GCC diagnostic push

2681

#pragma GCC diagnostic ignored "-Wcast-qual"

2682

#endif

2683

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

2684

#ifdef __GNUC__

2685

#pragma GCC diagnostic pop

2686

#endif

2687

2376

free(mc.current_server);

2688

2377

mc.current_server = next;

2689

2378

}

2690

2379

}

2691

2380

2692

/* Re-raise privileges */

2381

/* Re-raise priviliges */

2693

2382

{

2694

ret_errno = raise_privileges();

2695

if(ret_errno != 0){

2696

errno = ret_errno;

2697

perror_plus("Failed to raise privileges");

2698

} else {

2699

2700

/* Run network hooks */

2701

run_network_hooks("stop", interfaces_hooks != NULL ?

2702

interfaces_hooks : "", delay);

2703

2704

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

2705

{

2706

char *interface = NULL;

2707

while((interface=argz_next(interfaces_to_take_down,

2708

interfaces_to_take_down_size,

2709

interface))){

2710

ret_errno = take_down_interface(interface);

2711

if(ret_errno != 0){

2712

errno = ret_errno;

2713

perror_plus("Failed to take down interface");

2714

}

2715

}

2716

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

2717

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

2718

" down\n");

2719

}

2720

}

2721

}

2722

2723

ret_errno = lower_privileges_permanently();

2724

if(ret_errno != 0){

2725

errno = ret_errno;

2726

perror_plus("Failed to lower privileges permanently");

2727

}

2383

raise_privileges();

2384

2385

/* Run network hooks */

2386

run_network_hooks("stop", interfaces_hooks, delay);

2387

2388

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

2389

{

2390

char *interface = NULL;

2391

while((interface=argz_next(interfaces_to_take_down,

2392

interfaces_to_take_down_size,

2393

interface))){

2394

ret_errno = take_down_interface(interface);

2395

if(ret_errno != 0){

2396

errno = ret_errno;

2397

perror_plus("Failed to take down interface");

2398

}

2399

}

2400

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

2401

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

2402

" down\n");

2403

}

2404

}

2405

2406

lower_privileges_permanently();

2728

2407

}

2729

2408

2730

2409

free(interfaces_to_take_down);

2731

2410

free(interfaces_hooks);

2732

2411

2733

2412

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

2734

if(tempdir != NULL){

2413

if(tempdir_created){

2735

2414

struct dirent **direntries = NULL;

2736

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

2737

O_NOFOLLOW));

2738

if(tempdir_fd == -1){

2739

perror_plus("open");

2740

} else {

2741

#ifdef __GLIBC__

2742

#if __GLIBC_PREREQ(2, 15)

2743

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

2744

notdotentries, alphasort);

2745

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

2746

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

2747

alphasort);

2748

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

2749

#else /* not __GLIBC__ */

2750

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

2751

alphasort);

2752

#endif /* not __GLIBC__ */

2753

if(numentries >= 0){

2754

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

2755

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

2756

if(ret == -1){

2757

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

2758

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

2759

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

2760

}

2761

free(direntries[i]);

2762

}

2763

2764

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

2765

free(direntries);

2766

if(numentries == -1){

2767

perror_plus("scandir");

2768

}

2769

ret = rmdir(tempdir);

2770

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

2771

perror_plus("rmdir");

2772

}

2415

struct dirent *direntry = NULL;

2416

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

2417

alphasort);

2418

if (numentries > 0){

2419

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

2420

direntry = direntries[i];

2421

char *fullname = NULL;

2422

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

2423

direntry->d_name);

2424

if(ret < 0){

2425

perror_plus("asprintf");

2426

continue;

2427

}

2428

ret = remove(fullname);

2429

if(ret == -1){

2430

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

2431

strerror(errno));

2432

}

2433

free(fullname);

2773

2434

}

2774

TEMP_FAILURE_RETRY(close(tempdir_fd));

2435

}

2436

2437

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

2438

free(direntries);

2439

if (numentries == -1){

2440

perror_plus("scandir");

2441

}

2442

ret = rmdir(tempdir);

2443

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

2444

perror_plus("rmdir");

2775

2445

}

2776

2446

}

2777

2447