/mandos/trunk : revision 730

9

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

10

*

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* 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

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(),

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stdout, ferror(), remove() */

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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(),

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opendir(), DIR */

56

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

57

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

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inet_pton(), connect() */

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

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inet_pton(), connect(),

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getnameinfo() */

60

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

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61

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

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62

*/

62

63

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

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64

strtoimax() */

64

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

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

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program_invocation_short_name */

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

73

*/

74

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

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

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

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

76

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

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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

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argp_state, struct argp,

88

89

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

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WEXITSTATUS(), WTERMSIG() */

90

91

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

92

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

96

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

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EAI_SYSTEM, gai_strerror() */

91

98

92

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#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

#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);

224

252

return false;

225

253

}

226

254

/* Special case of first server */

227

if (mc.current_server == NULL){

255

if(*current_server == NULL){

228

256

new_server->next = new_server;

229

257

new_server->prev = new_server;

230

mc.current_server = new_server;

231

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

258

*current_server = new_server;

232

259

} else {

233

new_server->next = mc.current_server;

234

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

260

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

261

new_server->next = *current_server;

262

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

235

263

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;

264

(*current_server)->prev = new_server;

242

265

}

243

266

return true;

244

267

}

246

269

/*

247

270

* Initialize GPGME.

248

271

*/

249

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

250

const char *tempdir){

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){

251

277

gpgme_error_t rc;

252

278

gpgme_engine_info_t engine_info;

253

279

254

255

280

/*

256

281

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

257

282

*/

258

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

259

284

int ret;

260

285

int fd;

261

286

gpgme_data_t pgp_data;

273

298

return false;

274

299

}

275

300

276

rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

277

302

if(rc != GPG_ERR_NO_ERROR){

278

303

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

279

304

gpgme_strsource(rc), gpgme_strerror(rc));

323

348

}

324

349

325

350

/* Create new GPGME "context" */

326

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

351

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

327

352

if(rc != GPG_ERR_NO_ERROR){

328

353

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

329

354

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

342

367

* Decrypt OpenPGP data.

343

368

* Returns -1 on error

344

369

*/

370

__attribute__((nonnull, warn_unused_result))

345

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

372

size_t crypto_size,

347

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

348

375

gpgme_data_t dh_crypto, dh_plain;

349

376

gpgme_error_t rc;

350

377

ssize_t ret;

376

403

377

404

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

378

405

data buffer */

379

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

406

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

380

407

if(rc != GPG_ERR_NO_ERROR){

381

408

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

382

409

gpgme_strsource(rc), gpgme_strerror(rc));

383

410

plaintext_length = -1;

384

411

if(debug){

385

412

gpgme_decrypt_result_t result;

386

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

387

414

if(result == NULL){

388

415

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

389

416

} else {

466

493

return plaintext_length;

467

494

}

468

495

469

static const char * safer_gnutls_strerror(int value){

470

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

471

-Wunreachable-code */

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

472

499

if(ret == NULL)

473

500

ret = "(unknown)";

474

501

return ret;

475

502

}

476

503

477

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

478

506

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

479

507

const char* string){

480

508

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

481

509

}

482

510

511

__attribute__((nonnull, warn_unused_result))

483

512

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename){

513

const char *seckeyfilename,

514

mandos_context *mc){

485

515

int ret;

486

516

487

517

if(debug){

504

534

}

505

535

506

536

/* OpenPGP credentials */

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

508

538

if(ret != GNUTLS_E_SUCCESS){

509

539

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

510

540

safer_gnutls_strerror(ret));

520

550

}

521

551

522

552

ret = gnutls_certificate_set_openpgp_key_file

523

(mc.cred, pubkeyfilename, seckeyfilename,

553

(mc->cred, pubkeyfilename, seckeyfilename,

524

554

GNUTLS_OPENPGP_FMT_BASE64);

525

555

if(ret != GNUTLS_E_SUCCESS){

526

556

fprintf_plus(stderr,

532

562

}

533

563

534

564

/* GnuTLS server initialization */

535

ret = gnutls_dh_params_init(&mc.dh_params);

565

ret = gnutls_dh_params_init(&mc->dh_params);

536

566

if(ret != GNUTLS_E_SUCCESS){

537

567

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

568

" initialization: %s\n",

539

569

safer_gnutls_strerror(ret));

540

570

goto globalfail;

541

571

}

542

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

572

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

543

573

if(ret != GNUTLS_E_SUCCESS){

544

574

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

545

575

safer_gnutls_strerror(ret));

546

576

goto globalfail;

547

577

}

548

578

549

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

579

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

550

580

551

581

return 0;

552

582

553

583

globalfail:

554

584

555

gnutls_certificate_free_credentials(mc.cred);

585

gnutls_certificate_free_credentials(mc->cred);

556

586

gnutls_global_deinit();

557

gnutls_dh_params_deinit(mc.dh_params);

587

gnutls_dh_params_deinit(mc->dh_params);

558

588

return -1;

559

589

}

560

590

561

static int init_gnutls_session(gnutls_session_t *session){

591

__attribute__((nonnull, warn_unused_result))

592

static int init_gnutls_session(gnutls_session_t *session,

593

mandos_context *mc){

562

594

int ret;

563

595

/* GnuTLS session creation */

564

596

do {

576

608

{

577

609

const char *err;

578

610

do {

579

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

611

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

580

612

if(quit_now){

581

613

gnutls_deinit(*session);

582

614

return -1;

593

625

594

626

do {

595

627

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

596

mc.cred);

628

mc->cred);

597

629

if(quit_now){

598

630

gnutls_deinit(*session);

599

631

return -1;

609

641

/* ignore client certificate if any. */

610

642

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

611

643

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

613

645

614

646

return 0;

615

647

}

619

651

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

620

652

621

653

/* Called when a Mandos server is found */

622

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

654

__attribute__((nonnull, warn_unused_result))

655

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

623

656

AvahiIfIndex if_index,

624

int af){

657

int af, mandos_context *mc){

625

658

int ret, tcp_sd = -1;

626

659

ssize_t sret;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

660

struct sockaddr_storage to;

631

661

char *buffer = NULL;

632

662

char *decrypted_buffer = NULL;

633

663

size_t buffer_length = 0;

657

687

return -1;

658

688

}

659

689

660

ret = init_gnutls_session(&session);

690

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

691

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

692

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

693

bool match = false;

694

{

695

char *interface = NULL;

696

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

697

interface))){

698

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

699

match = true;

700

break;

701

}

702

}

703

}

704

if(not match){

705

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

706

connect to the server */

707

if(debug){

708

char interface[IF_NAMESIZE];

709

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

710

perror_plus("if_indextoname");

711

} else {

712

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

713

" \"%s\"\n",

714

if_indextoname((unsigned int)if_index,

715

interface));

716

}

717

}

718

return -1;

719

}

720

}

721

722

ret = init_gnutls_session(&session, mc);

661

723

if(ret != 0){

662

724

return -1;

663

725

}

664

726

665

727

if(debug){

666

728

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

667

PRIu16 "\n", ip, port);

729

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

668

730

}

669

731

670

732

tcp_sd = socket(pf, SOCK_STREAM, 0);

682

744

683

745

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

684

746

if(af == AF_INET6){

685

to.in6.sin6_family = (sa_family_t)af;

686

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

747

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

748

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

687

749

} else { /* IPv4 */

688

to.in.sin_family = (sa_family_t)af;

689

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

750

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

751

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

690

752

}

691

753

if(ret < 0 ){

692

754

int e = errno;

701

763

goto mandos_end;

702

764

}

703

765

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*/

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

711

769

if(if_index == AVAHI_IF_UNSPEC){

712

770

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

713

771

" incomplete without a network interface\n");

715

773

goto mandos_end;

716

774

}

717

775

/* Set the network interface number as scope */

718

to.in6.sin6_scope_id = (uint32_t)if_index;

776

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

719

777

}

720

778

} else {

721

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

722

-Wconversion and

723

-Wunreachable-code */

779

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

724

780

}

725

781

726

782

if(quit_now){

734

790

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

735

791

perror_plus("if_indextoname");

736

792

} else {

737

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

738

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

793

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

794

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

739

795

}

740

796

} else {

741

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

742

ip, port);

797

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

798

ip, (uintmax_t)port);

743

799

}

744

800

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

745

801

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

746

const char *pcret;

747

802

if(af == AF_INET6){

748

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

749

sizeof(addrstr));

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

750

807

} else {

751

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

752

sizeof(addrstr));

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

753

812

}

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

}

813

if(ret == EAI_SYSTEM){

814

perror_plus("getnameinfo");

815

} else if(ret != 0) {

816

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

817

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

818

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

760

819

}

761

820

}

762

821

766

825

}

767

826

768

827

if(af == AF_INET6){

769

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

828

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

829

sizeof(struct sockaddr_in6));

770

830

} else {

771

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

831

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

832

sizeof(struct sockaddr_in));

772

833

}

773

834

if(ret < 0){

774

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

835

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

775

836

int e = errno;

776

837

perror_plus("connect");

777

838

errno = e;

938

999

if(buffer_length > 0){

939

1000

ssize_t decrypted_buffer_size;

940

1001

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

941

&decrypted_buffer);

1002

&decrypted_buffer, mc);

942

1003

if(decrypted_buffer_size >= 0){

943

1004

944

1005

written = 0;

992

1053

return retval;

993

1054

}

994

1055

1056

__attribute__((nonnull))

995

1057

static void resolve_callback(AvahiSServiceResolver *r,

996

1058

AvahiIfIndex interface,

997

1059

AvahiProtocol proto,

1005

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

1006

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1007

1069

flags,

1008

AVAHI_GCC_UNUSED void* userdata){

1009

assert(r);

1070

void *mc){

1071

if(r == NULL){

1072

return;

1073

}

1010

1074

1011

1075

/* Called whenever a service has been resolved successfully or

1012

1076

timed out */

1013

1077

1014

1078

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1015

1080

return;

1016

1081

}

1017

1082

1021

1086

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

1022

1087

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

1023

1088

domain,

1024

avahi_strerror(avahi_server_errno(mc.server)));

1089

avahi_strerror(avahi_server_errno

1090

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

1025

1091

break;

1026

1092

1027

1093

case AVAHI_RESOLVER_FOUND:

1033

1099

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

1034

1100

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

1035

1101

}

1036

int ret = start_mandos_communication(ip, port, interface,

1037

avahi_proto_to_af(proto));

1102

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

1103

interface,

1104

avahi_proto_to_af(proto),

1105

mc);

1038

1106

if(ret == 0){

1039

avahi_simple_poll_quit(mc.simple_poll);

1107

avahi_simple_poll_quit(simple_poll);

1040

1108

} else {

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1109

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

1110

avahi_proto_to_af(proto),

1111

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

1043

1112

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

1044

1113

" list\n", name);

1045

1114

}

1058

1127

const char *domain,

1059

1128

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1060

1129

flags,

1061

AVAHI_GCC_UNUSED void* userdata){

1062

assert(b);

1130

void *mc){

1131

if(b == NULL){

1132

return;

1133

}

1063

1134

1064

1135

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

1065

1136

is removed from the LAN */

1073

1144

case AVAHI_BROWSER_FAILURE:

1074

1145

1075

1146

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

1076

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_simple_poll_quit(mc.simple_poll);

1147

avahi_strerror(avahi_server_errno

1148

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

1149

avahi_simple_poll_quit(simple_poll);

1078

1150

return;

1079

1151

1080

1152

case AVAHI_BROWSER_NEW:

1083

1155

the callback function is called the Avahi server will free the

1084

1156

resolver for us. */

1085

1157

1086

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

1087

name, type, domain, protocol, 0,

1088

resolve_callback, NULL) == NULL)

1158

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

1159

interface, protocol, name, type,

1160

domain, protocol, 0,

1161

resolve_callback, mc) == NULL)

1089

1162

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

1090

1163

" %s\n", name,

1091

avahi_strerror(avahi_server_errno(mc.server)));

1164

avahi_strerror(avahi_server_errno

1165

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

1092

1166

break;

1093

1167

1094

1168

case AVAHI_BROWSER_REMOVE:

1113

1187

signal_received = sig;

1114

1188

int old_errno = errno;

1115

1189

/* set main loop to exit */

1116

if(mc.simple_poll != NULL){

1117

avahi_simple_poll_quit(mc.simple_poll);

1190

if(simple_poll != NULL){

1191

avahi_simple_poll_quit(simple_poll);

1118

1192

}

1119

1193

errno = old_errno;

1120

1194

}

1121

1195

1196

__attribute__((nonnull, warn_unused_result))

1122

1197

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

1123

1198

int ret;

1199

error_t ret_errno;

1124

1200

1125

1201

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

1126

1202

if(s < 0){

1203

ret_errno = errno;

1127

1204

perror_plus("socket");

1205

errno = ret_errno;

1128

1206

return false;

1129

1207

}

1130

1208

strcpy(ifr->ifr_name, ifname);

1131

1209

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1132

1210

if(ret == -1){

1133

1211

if(debug){

1212

ret_errno = errno;

1134

1213

perror_plus("ioctl SIOCGIFFLAGS");

1214

errno = ret_errno;

1135

1215

}

1136

1216

return false;

1137

1217

}

1138

1218

return true;

1139

1219

}

1140

1220

1221

__attribute__((nonnull, warn_unused_result))

1141

1222

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

1142

1223

1143

1224

/* Reject the loopback device */

1185

1266

* corresponds to an acceptable network device.

1186

1267

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

1187

1268

*/

1269

__attribute__((nonnull, warn_unused_result))

1188

1270

int good_interface(const struct dirent *if_entry){

1189

1271

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

1190

1272

return 0;

1206

1288

}

1207

1289

1208

1290

/*

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

1291

* This function determines if a network interface is up.

1292

*/

1293

__attribute__((nonnull, warn_unused_result))

1294

bool interface_is_up(const char *interface){

1295

struct ifreq ifr;

1296

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

1297

if(debug){

1298

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

1299

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

1300

}

1301

return false;

1302

}

1303

1304

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

1305

}

1306

1307

/*

1308

* This function determines if a network interface is running

1309

*/

1310

__attribute__((nonnull, warn_unused_result))

1311

bool interface_is_running(const char *interface){

1312

struct ifreq ifr;

1313

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

1314

if(debug){

1315

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

1316

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

1317

}

1318

return false;

1319

}

1320

1321

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

1322

}

1323

1324

__attribute__((nonnull, pure, warn_unused_result))

1251

1325

int notdotentries(const struct dirent *direntry){

1252

1326

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

1253

1327

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

1260

1334

}

1261

1335

1262

1336

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

1337

__attribute__((nonnull, warn_unused_result))

1263

1338

int runnable_hook(const struct dirent *direntry){

1264

1339

int ret;

1265

1340

size_t sret;

1273

1348

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

1274

1349

"abcdefghijklmnopqrstuvwxyz"

1275

1350

"0123456789"

1276

"_-");

1351

"_.-");

1277

1352

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

1278

1353

/* Contains non-allowed characters */

1279

1354

if(debug){

1283

1358

return 0;

1284

1359

}

1285

1360

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);

1361

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

1294

1362

if(ret == -1){

1295

1363

if(debug){

1296

1364

perror_plus("Could not stat hook");

1320

1388

return 1;

1321

1389

}

1322

1390

1323

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1391

__attribute__((nonnull, warn_unused_result))

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

mandos_context *mc){

1324

1394

int ret;

1325

1395

struct timespec now;

1326

1396

struct timespec waited_time;

1327

1397

intmax_t block_time;

1328

1398

1329

1399

while(true){

1330

if(mc.current_server == NULL){

1331

if (debug){

1400

if(mc->current_server == NULL){

1401

if(debug){

1332

1402

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

1333

1403

" No timeout!\n");

1334

1404

}

1335

1405

ret = avahi_simple_poll_iterate(s, -1);

1336

1406

} else {

1337

if (debug){

1407

if(debug){

1338

1408

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

1339

1409

" it, or wait\n");

1340

1410

}

1347

1417

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

1348

1418

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

1349

1419

waited_time.tv_sec = (now.tv_sec

1350

- mc.current_server->last_seen.tv_sec);

1420

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

1351

1421

waited_time.tv_nsec = (now.tv_nsec

1352

- mc.current_server->last_seen.tv_nsec);

1422

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

1353

1423

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

1354

1424

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

1355

1425

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

1357

1427

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

1358

1428

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

1359

1429

1360

if (debug){

1430

if(debug){

1361

1431

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

1362

1432

block_time);

1363

1433

}

1364

1434

1365

1435

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);

1436

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

1437

mc->current_server->port,

1438

mc->current_server->if_index,

1439

mc->current_server->af, mc);

1370

1440

if(ret == 0){

1371

avahi_simple_poll_quit(mc.simple_poll);

1441

avahi_simple_poll_quit(s);

1372

1442

return 0;

1373

1443

}

1374

1444

ret = clock_gettime(CLOCK_MONOTONIC,

1375

&mc.current_server->last_seen);

1445

&mc->current_server->last_seen);

1376

1446

if(ret == -1){

1377

1447

perror_plus("clock_gettime");

1378

1448

return -1;

1379

1449

}

1380

mc.current_server = mc.current_server->next;

1450

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

1381

1451

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

1382

1452

servers, but don't block */

1383

1453

}

1385

1455

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

1386

1456

}

1387

1457

if(ret != 0){

1388

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

1458

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

1389

1459

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

1390

1460

}

1391

1461

}

1393

1463

}

1394

1464

1395

1465

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

1396

int raise_privileges(void){

1397

int old_errno = errno;

1398

int ret_errno = 0;

1399

errno = 0;

1466

__attribute__((warn_unused_result))

1467

error_t raise_privileges(void){

1468

error_t old_errno = errno;

1469

error_t ret_errno = 0;

1400

1470

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

1401

perror_plus("seteuid");

1471

ret_errno = errno;

1402

1472

}

1403

ret_errno = errno;

1404

1473

errno = old_errno;

1405

1474

return ret_errno;

1406

1475

}

1407

1476

1408

1477

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

1409

int raise_privileges_permanently(void){

1410

int old_errno = errno;

1411

int ret_errno = raise_privileges();

1478

__attribute__((warn_unused_result))

1479

error_t raise_privileges_permanently(void){

1480

error_t old_errno = errno;

1481

error_t ret_errno = raise_privileges();

1412

1482

if(ret_errno != 0){

1413

1483

errno = old_errno;

1414

1484

return ret_errno;

1415

1485

}

1416

errno = 0;

1417

1486

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

1418

perror_plus("seteuid");

1487

ret_errno = errno;

1419

1488

}

1420

ret_errno = errno;

1421

1489

errno = old_errno;

1422

1490

return ret_errno;

1423

1491

}

1424

1492

1425

1493

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

1426

int lower_privileges(void){

1427

int old_errno = errno;

1428

int ret_errno = 0;

1429

errno = 0;

1494

__attribute__((warn_unused_result))

1495

error_t lower_privileges(void){

1496

error_t old_errno = errno;

1497

error_t ret_errno = 0;

1430

1498

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

1431

perror_plus("seteuid");

1432

}

1433

ret_errno = errno;

1434

errno = old_errno;

1435

return ret_errno;

1436

}

1437

1438

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

1499

ret_errno = errno;

1500

}

1501

errno = old_errno;

1502

return ret_errno;

1503

}

1504

1505

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1507

error_t lower_privileges_permanently(void){

1508

error_t old_errno = errno;

1509

error_t ret_errno = 0;

1510

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

1511

ret_errno = errno;

1512

}

1513

errno = old_errno;

1514

return ret_errno;

1515

}

1516

1517

__attribute__((nonnull))

1518

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

1439

1519

const float delay){

1440

struct dirent **direntries;

1441

struct dirent *direntry;

1442

int ret;

1443

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

1444

alphasort);

1520

struct dirent **direntries = NULL;

1521

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1523

if(hookdir_fd == -1){

1524

if(errno == ENOENT){

1525

if(debug){

1526

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

1527

" found\n", hookdir);

1528

}

1529

} else {

1530

perror_plus("open");

1531

}

1532

return;

1533

}

1534

}

1535

#ifdef __GLIBC__

1536

#if __GLIBC_PREREQ(2, 15)

1537

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

1538

runnable_hook, alphasort);

1539

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

1540

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

1541

alphasort);

1542

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

1543

#else /* not __GLIBC__ */

1544

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

1545

alphasort);

1546

#endif /* not __GLIBC__ */

1445

1547

if(numhooks == -1){

1446

1548

perror_plus("scandir");

1447

} else {

1448

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

1449

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

1450

direntry = direntries[i];

1451

char *fullname = NULL;

1452

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

1453

if(ret < 0){

1549

return;

1550

}

1551

struct dirent *direntry;

1552

int ret;

1553

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

1554

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

1555

direntry = direntries[i];

1556

if(debug){

1557

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

1558

direntry->d_name);

1559

}

1560

pid_t hook_pid = fork();

1561

if(hook_pid == 0){

1562

/* Child */

1563

/* Raise privileges */

1564

errno = raise_privileges_permanently();

1565

if(errno != 0){

1566

perror_plus("Failed to raise privileges");

1567

_exit(EX_NOPERM);

1568

}

1569

/* Set group */

1570

errno = 0;

1571

ret = setgid(0);

1572

if(ret == -1){

1573

perror_plus("setgid");

1574

_exit(EX_NOPERM);

1575

}

1576

/* Reset supplementary groups */

1577

errno = 0;

1578

ret = setgroups(0, NULL);

1579

if(ret == -1){

1580

perror_plus("setgroups");

1581

_exit(EX_NOPERM);

1582

}

1583

ret = dup2(devnull, STDIN_FILENO);

1584

if(ret == -1){

1585

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

1586

_exit(EX_OSERR);

1587

}

1588

ret = close(devnull);

1589

if(ret == -1){

1590

perror_plus("close");

1591

_exit(EX_OSERR);

1592

}

1593

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1594

if(ret == -1){

1595

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

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

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

1604

if(ret == -1){

1605

perror_plus("setenv");

1606

_exit(EX_OSERR);

1607

}

1608

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

1609

if(ret == -1){

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1615

perror_plus("setenv");

1616

_exit(EX_OSERR);

1617

}

1618

char *delaystring;

1619

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

1620

if(ret == -1){

1454

1621

perror_plus("asprintf");

1455

continue;

1456

}

1457

if(debug){

1458

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

1459

direntry->d_name);

1460

}

1461

pid_t hook_pid = fork();

1462

if(hook_pid == 0){

1463

/* Child */

1464

/* Raise privileges */

1465

raise_privileges_permanently();

1466

/* Set group */

1467

errno = 0;

1468

ret = setgid(0);

1469

if(ret == -1){

1470

perror_plus("setgid");

1471

}

1472

/* Reset supplementary groups */

1473

errno = 0;

1474

ret = setgroups(0, NULL);

1475

if(ret == -1){

1476

perror_plus("setgroups");

1477

}

1478

dup2(devnull, STDIN_FILENO);

1479

close(devnull);

1480

dup2(STDERR_FILENO, STDOUT_FILENO);

1481

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

1482

if(ret == -1){

1483

perror_plus("setenv");

1484

_exit(EX_OSERR);

1485

}

1486

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

1487

if(ret == -1){

1488

perror_plus("setenv");

1489

_exit(EX_OSERR);

1490

}

1491

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

1492

if(ret == -1){

1493

perror_plus("setenv");

1494

_exit(EX_OSERR);

1495

}

1496

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

1497

if(ret == -1){

1498

perror_plus("setenv");

1499

_exit(EX_OSERR);

1500

}

1501

char *delaystring;

1502

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

1503

if(ret == -1){

1504

perror_plus("asprintf");

1505

_exit(EX_OSERR);

1506

}

1507

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

1508

if(ret == -1){

1509

free(delaystring);

1510

perror_plus("setenv");

1511

_exit(EX_OSERR);

1512

}

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

1513

1626

free(delaystring);

1514

if(connect_to != NULL){

1515

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

1516

if(ret == -1){

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1520

}

1521

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

1522

perror_plus("execl");

1523

_exit(EXIT_FAILURE);

1524

}

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

free(delaystring);

1631

if(connect_to != NULL){

1632

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

1633

if(ret == -1){

1634

perror_plus("setenv");

1635

_exit(EX_OSERR);

1636

}

1637

}

1638

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

1639

if(hook_fd == -1){

1640

perror_plus("openat");

1641

_exit(EXIT_FAILURE);

1642

}

1643

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

1644

perror_plus("close");

1645

_exit(EXIT_FAILURE);

1646

}

1647

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

1648

environ) == -1){

1649

perror_plus("fexecve");

1650

_exit(EXIT_FAILURE);

1651

}

1652

} else {

1653

int status;

1654

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

1655

perror_plus("waitpid");

1656

free(direntry);

1657

continue;

1658

}

1659

if(WIFEXITED(status)){

1660

if(WEXITSTATUS(status) != 0){

1661

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

1662

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

1663

WEXITSTATUS(status));

1664

free(direntry);

1665

continue;

1666

}

1667

} else if(WIFSIGNALED(status)){

1668

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

1669

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

1670

WTERMSIG(status));

1671

free(direntry);

1672

continue;

1525

1673

} else {

1526

int status;

1527

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

1528

perror_plus("waitpid");

1529

free(fullname);

1530

continue;

1531

}

1532

if(WIFEXITED(status)){

1533

if(WEXITSTATUS(status) != 0){

1534

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

1535

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

1536

WEXITSTATUS(status));

1537

free(fullname);

1538

continue;

1539

}

1540

} else if(WIFSIGNALED(status)){

1541

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

1542

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

1543

WTERMSIG(status));

1544

free(fullname);

1545

continue;

1546

} else {

1547

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

1548

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

1549

free(fullname);

1550

continue;

1551

}

1552

}

1553

free(fullname);

1554

if(debug){

1555

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

1556

direntry->d_name);

1557

}

1558

}

1559

close(devnull);

1560

}

1561

return true;

1674

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

1675

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

1676

free(direntry);

1677

continue;

1678

}

1679

}

1680

if(debug){

1681

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

1682

direntry->d_name);

1683

}

1684

free(direntry);

1685

}

1686

free(direntries);

1687

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

1688

perror_plus("close");

1689

} else {

1690

hookdir_fd = -1;

1691

}

1692

close(devnull);

1562

1693

}

1563

1694

1564

int bring_up_interface(const char * const interface, const float delay){

1565

int sd = -1;

1566

int old_errno = errno;

1567

int ret_errno = 0;

1695

__attribute__((nonnull, warn_unused_result))

1696

error_t bring_up_interface(const char *const interface,

1697

const float delay){

1698

error_t old_errno = errno;

1568

1699

int ret;

1569

1700

struct ifreq network;

1570

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1701

unsigned int if_index = if_nametoindex(interface);

1571

1702

if(if_index == 0){

1572

1703

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

1573

1704

errno = old_errno;

1579

1710

return EINTR;

1580

1711

}

1581

1712

1582

/* Re-raise priviliges */

1583

raise_privileges();

1584

1585

#ifdef __linux__

1586

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1587

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

1588

ret = klogctl(8, NULL, 5);

1589

bool restore_loglevel = true;

1590

if(ret == -1){

1591

restore_loglevel = false;

1592

perror_plus("klogctl");

1593

}

1594

#endif /* __linux__ */

1595

1596

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1597

if(sd < 0){

1598

ret_errno = errno;

1599

perror_plus("socket");

1600

#ifdef __linux__

1601

if(restore_loglevel){

1602

ret = klogctl(7, NULL, 0);

1603

if(ret == -1){

1604

perror_plus("klogctl");

1605

}

1606

}

1607

#endif /* __linux__ */

1608

/* Lower privileges */

1609

lower_privileges();

1610

errno = old_errno;

1611

return ret_errno;

1612

}

1613

strcpy(network.ifr_name, interface);

1614

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

1615

if(ret == -1){

1616

ret_errno = errno;

1617

perror_plus("ioctl SIOCGIFFLAGS");

1618

#ifdef __linux__

1619

if(restore_loglevel){

1620

ret = klogctl(7, NULL, 0);

1621

if(ret == -1){

1622

perror_plus("klogctl");

1623

}

1624

}

1625

#endif /* __linux__ */

1626

/* Lower privileges */

1627

lower_privileges();

1628

errno = old_errno;

1629

return ret_errno;

1630

}

1631

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

1632

network.ifr_flags |= IFF_UP;

1633

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

1713

if(not interface_is_up(interface)){

1714

error_t ret_errno = 0, ioctl_errno = 0;

1715

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

1716

ret_errno = errno;

1717

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

1718

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

1719

errno = old_errno;

1720

return ret_errno;

1721

}

1722

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

1723

1724

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

1725

if(sd == -1){

1726

ret_errno = errno;

1727

perror_plus("socket");

1728

errno = old_errno;

1729

return ret_errno;

1730

}

1731

1732

if(quit_now){

1733

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

1734

if(ret == -1){

1735

perror_plus("close");

1736

}

1737

errno = old_errno;

1738

return EINTR;

1739

}

1740

1741

if(debug){

1742

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

1743

interface);

1744

}

1745

1746

/* Raise privileges */

1747

ret_errno = raise_privileges();

1748

if(ret_errno != 0){

1749

errno = ret_errno;

1750

perror_plus("Failed to raise privileges");

1751

}

1752

1753

#ifdef __linux__

1754

int ret_linux;

1755

bool restore_loglevel = false;

1756

if(ret_errno == 0){

1757

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1758

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

1759

ret_linux = klogctl(8, NULL, 5);

1760

if(ret_linux == -1){

1761

perror_plus("klogctl");

1762

} else {

1763

restore_loglevel = true;

1764

}

1765

}

1766

#endif /* __linux__ */

1767

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

1768

ioctl_errno = errno;

1769

#ifdef __linux__

1770

if(restore_loglevel){

1771

ret_linux = klogctl(7, NULL, 0);

1772

if(ret_linux == -1){

1773

perror_plus("klogctl");

1774

}

1775

}

1776

#endif /* __linux__ */

1777

1778

/* If raise_privileges() succeeded above */

1779

if(ret_errno == 0){

1780

/* Lower privileges */

1781

ret_errno = lower_privileges();

1782

if(ret_errno != 0){

1783

errno = ret_errno;

1784

perror_plus("Failed to lower privileges");

1785

}

1786

}

1787

1788

/* Close the socket */

1789

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

1634

1790

if(ret == -1){

1635

ret_errno = errno;

1791

perror_plus("close");

1792

}

1793

1794

if(ret_setflags == -1){

1795

errno = ioctl_errno;

1636

1796

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1637

#ifdef __linux__

1638

if(restore_loglevel){

1639

ret = klogctl(7, NULL, 0);

1640

if(ret == -1){

1641

perror_plus("klogctl");

1642

}

1643

}

1644

#endif /* __linux__ */

1645

/* Lower privileges */

1646

lower_privileges();

1647

1797

errno = old_errno;

1648

return ret_errno;

1798

return ioctl_errno;

1649

1799

}

1800

} else if(debug){

1801

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

1802

interface);

1650

1803

}

1804

1651

1805

/* Sleep checking until interface is running.

1652

1806

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

1653

1807

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

1654

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

1655

if(ret == -1){

1656

perror_plus("ioctl SIOCGIFFLAGS");

1657

} else if(network.ifr_flags & IFF_RUNNING){

1808

if(interface_is_running(interface)){

1658

1809

break;

1659

1810

}

1660

1811

struct timespec sleeptime = { .tv_nsec = 250000000 };

1663

1814

perror_plus("nanosleep");

1664

1815

}

1665

1816

}

1666

/* Close the socket */

1667

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

1668

if(ret == -1){

1669

perror_plus("close");

1817

1818

errno = old_errno;

1819

return 0;

1820

}

1821

1822

__attribute__((nonnull, warn_unused_result))

1823

error_t take_down_interface(const char *const interface){

1824

error_t old_errno = errno;

1825

struct ifreq network;

1826

unsigned int if_index = if_nametoindex(interface);

1827

if(if_index == 0){

1828

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

1829

errno = old_errno;

1830

return ENXIO;

1670

1831

}

1671

#ifdef __linux__

1672

if(restore_loglevel){

1673

/* Restores kernel loglevel to default */

1674

ret = klogctl(7, NULL, 0);

1832

if(interface_is_up(interface)){

1833

error_t ret_errno = 0, ioctl_errno = 0;

1834

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

1835

ret_errno = errno;

1836

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

1837

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

1838

errno = old_errno;

1839

return ret_errno;

1840

}

1841

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

1842

1843

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

1844

if(sd == -1){

1845

ret_errno = errno;

1846

perror_plus("socket");

1847

errno = old_errno;

1848

return ret_errno;

1849

}

1850

1851

if(debug){

1852

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

1853

interface);

1854

}

1855

1856

/* Raise privileges */

1857

ret_errno = raise_privileges();

1858

if(ret_errno != 0){

1859

errno = ret_errno;

1860

perror_plus("Failed to raise privileges");

1861

}

1862

1863

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

1864

ioctl_errno = errno;

1865

1866

/* If raise_privileges() succeeded above */

1867

if(ret_errno == 0){

1868

/* Lower privileges */

1869

ret_errno = lower_privileges();

1870

if(ret_errno != 0){

1871

errno = ret_errno;

1872

perror_plus("Failed to lower privileges");

1873

}

1874

}

1875

1876

/* Close the socket */

1877

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

1675

1878

if(ret == -1){

1676

perror_plus("klogctl");

1677

}

1879

perror_plus("close");

1880

}

1881

1882

if(ret_setflags == -1){

1883

errno = ioctl_errno;

1884

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1885

errno = old_errno;

1886

return ioctl_errno;

1887

}

1888

} else if(debug){

1889

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

1890

interface);

1678

1891

}

1679

#endif /* __linux__ */

1680

/* Lower privileges */

1681

lower_privileges();

1892

1682

1893

errno = old_errno;

1683

1894

return 0;

1684

1895

}

1685

1896

1686

1897

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

1898

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

1899

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

1900

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

1901

.interfaces = NULL, .interfaces_size = 0 };

1687

1902

AvahiSServiceBrowser *sb = NULL;

1688

int error;

1903

error_t ret_errno;

1689

1904

int ret;

1690

1905

intmax_t tmpmax;

1691

1906

char *tmp;

1692

1907

int exitcode = EXIT_SUCCESS;

1693

const char *interface = "";

1694

struct ifreq network;

1695

int sd = -1;

1696

bool take_down_interface = false;

1697

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

1698

bool tempdir_created = false;

1908

char *interfaces_to_take_down = NULL;

1909

size_t interfaces_to_take_down_size = 0;

1910

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

1911

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

1912

char *tempdir = NULL;

1699

1913

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1700

1914

const char *seckey = PATHDIR "/" SECKEY;

1701

1915

const char *pubkey = PATHDIR "/" PUBKEY;

1916

char *interfaces_hooks = NULL;

1702

1917

1703

1918

bool gnutls_initialized = false;

1704

1919

bool gpgme_initialized = false;

1795

2010

connect_to = arg;

1796

2011

break;

1797

2012

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

1798

interface = arg;

2013

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

2014

arg, (int)',');

2015

if(ret_errno != 0){

2016

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

2017

}

1799

2018

break;

1800

2019

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

1801

2020

seckey = arg;

1878

2097

/* Work around Debian bug #633582:

1879

2098

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

1880

2099

1881

/* Re-raise priviliges */

1882

if(raise_privileges() == 0){

2100

/* Re-raise privileges */

2101

ret_errno = raise_privileges();

2102

if(ret_errno != 0){

2103

errno = ret_errno;

2104

perror_plus("Failed to raise privileges");

2105

} else {

1883

2106

struct stat st;

1884

2107

1885

2108

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

1925

2148

}

1926

2149

1927

2150

/* Lower privileges */

1928

errno = 0;

1929

ret = seteuid(uid);

1930

if(ret == -1){

1931

perror_plus("seteuid");

2151

ret_errno = lower_privileges();

2152

if(ret_errno != 0){

2153

errno = ret_errno;

2154

perror_plus("Failed to lower privileges");

2155

}

2156

}

2157

}

2158

2159

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

2160

{

2161

char *interface = NULL;

2162

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

2163

interface))){

2164

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

2165

and if_nametoindex(interface) == 0){

2166

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

2167

fprintf_plus(stderr, "Not using nonexisting interface"

2168

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

2169

}

2170

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

2171

interface = NULL;

1932

2172

}

1933

2173

}

1934

2174

}

1935

2175

1936

2176

/* Run network hooks */

1937

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

1938

goto end;

2177

{

2178

if(mc.interfaces != NULL){

2179

interfaces_hooks = malloc(mc.interfaces_size);

2180

if(interfaces_hooks == NULL){

2181

perror_plus("malloc");

2182

goto end;

2183

}

2184

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

2185

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

2186

}

2187

run_network_hooks("start", interfaces_hooks != NULL ?

2188

interfaces_hooks : "", delay);

1939

2189

}

1940

2190

1941

2191

if(not debug){

1942

2192

avahi_set_log_function(empty_log);

1943

2193

}

1944

2194

1945

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

1946

struct dirent **direntries;

1947

/* First look for interfaces that are up */

1948

ret = scandir(sys_class_net, &direntries, up_interface,

1949

alphasort);

1950

if(ret == 0){

1951

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

1952

free(direntries);

1953

ret = scandir(sys_class_net, &direntries, good_interface,

1954

alphasort);

1955

}

1956

if(ret >= 1){

1957

/* Pick the first interface returned */

1958

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

1959

if(debug){

1960

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

1961

}

1962

if(interface == NULL){

1963

perror_plus("malloc");

1964

free(direntries);

1965

exitcode = EXIT_FAILURE;

1966

goto end;

1967

}

1968

free(direntries);

1969

} else {

1970

free(direntries);

1971

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

1972

exitcode = EXIT_FAILURE;

1973

goto end;

1974

}

1975

}

1976

1977

2195

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

1978

2196

from the signal handler */

1979

2197

/* Initialize the pseudo-RNG for Avahi */

1980

2198

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

1981

mc.simple_poll = avahi_simple_poll_new();

1982

if(mc.simple_poll == NULL){

2199

simple_poll = avahi_simple_poll_new();

2200

if(simple_poll == NULL){

1983

2201

fprintf_plus(stderr,

1984

2202

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

1985

2203

exitcode = EX_UNAVAILABLE;

2049

2267

}

2050

2268

}

2051

2269

2052

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

2053

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

2054

ret = bring_up_interface(interface, delay);

2055

if(ret != 0){

2056

errno = ret;

2057

perror_plus("Failed to bring up interface");

2058

}

2270

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

2271

if(mc.interfaces == NULL){

2272

struct dirent **direntries = NULL;

2273

/* Look for any good interfaces */

2274

ret = scandir(sys_class_net, &direntries, good_interface,

2275

alphasort);

2276

if(ret >= 1){

2277

/* Add all found interfaces to interfaces list */

2278

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

2279

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

2280

direntries[i]->d_name);

2281

if(ret_errno != 0){

2282

errno = ret_errno;

2283

perror_plus("argz_add");

2284

free(direntries[i]);

2285

continue;

2286

}

2287

if(debug){

2288

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

2289

direntries[i]->d_name);

2290

}

2291

free(direntries[i]);

2292

}

2293

free(direntries);

2294

} else {

2295

if(ret == 0){

2296

free(direntries);

2297

}

2298

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

2299

exitcode = EXIT_FAILURE;

2300

goto end;

2301

}

2302

}

2303

2304

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

2305

{

2306

char *interface = NULL;

2307

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

2308

interface))){

2309

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

2310

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

2311

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

2312

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

2313

interface);

2314

interface = NULL;

2315

while((interface = argz_next(mc.interfaces,

2316

mc.interfaces_size, interface))){

2317

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

2318

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

2319

interface);

2320

interface = NULL;

2321

}

2322

}

2323

break;

2324

}

2325

bool interface_was_up = interface_is_up(interface);

2326

errno = bring_up_interface(interface, delay);

2327

if(not interface_was_up){

2328

if(errno != 0){

2329

perror_plus("Failed to bring up interface");

2330

} else {

2331

errno = argz_add(&interfaces_to_take_down,

2332

&interfaces_to_take_down_size,

2333

interface);

2334

if(errno != 0){

2335

perror_plus("argz_add");

2336

}

2337

}

2338

}

2339

}

2340

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

2341

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

2342

}

2343

}

2344

2345

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

2346

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

2347

if(debug){

2348

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

2349

mc.interfaces);

2350

}

2351

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

2059

2352

}

2060

2353

2061

2354

if(quit_now){

2062

2355

goto end;

2063

2356

}

2064

2357

2065

ret = init_gnutls_global(pubkey, seckey);

2358

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

2066

2359

if(ret == -1){

2067

2360

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

2068

2361

exitcode = EX_UNAVAILABLE;

2075

2368

goto end;

2076

2369

}

2077

2370

2078

if(mkdtemp(tempdir) == NULL){

2371

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

2372

tempdir = mkdtemp(run_tempdir);

2373

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

2374

if(debug){

2375

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

2376

run_tempdir, old_tempdir);

2377

}

2378

tempdir = mkdtemp(old_tempdir);

2379

}

2380

if(tempdir == NULL){

2079

2381

perror_plus("mkdtemp");

2080

2382

goto end;

2081

2383

}

2082

tempdir_created = true;

2083

2384

2084

2385

if(quit_now){

2085

2386

goto end;

2086

2387

}

2087

2388

2088

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

2389

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

2089

2390

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

2090

2391

exitcode = EX_UNAVAILABLE;

2091

2392

goto end;

2112

2413

goto end;

2113

2414

}

2114

2415

2115

uint16_t port;

2416

in_port_t port;

2116

2417

errno = 0;

2117

2418

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

2118

2419

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

2119

or tmpmax != (uint16_t)tmpmax){

2420

or tmpmax != (in_port_t)tmpmax){

2120

2421

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

2121

2422

exitcode = EX_USAGE;

2122

2423

goto end;

2123

2424

}

2124

2425

2125

2426

if(quit_now){

2126

2427

goto end;

2127

2428

}

2128

2429

2129

port = (uint16_t)tmpmax;

2430

port = (in_port_t)tmpmax;

2130

2431

*address = '\0';

2131

2432

/* Colon in address indicates IPv6 */

2132

2433

int af;

2148

2449

}

2149

2450

2150

2451

while(not quit_now){

2151

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

2452

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

2453

&mc);

2152

2454

if(quit_now or ret == 0){

2153

2455

break;

2154

2456

}

2156

2458

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

2157

2459

(int)retry_interval);

2158

2460

}

2159

sleep((int)retry_interval);

2461

sleep((unsigned int)retry_interval);

2160

2462

}

2161

2463

2162

if (not quit_now){

2464

if(not quit_now){

2163

2465

exitcode = EXIT_SUCCESS;

2164

2466

}

2165

2467

2180

2482

config.publish_domain = 0;

2181

2483

2182

2484

/* Allocate a new server */

2183

mc.server = avahi_server_new(avahi_simple_poll_get

2184

(mc.simple_poll), &config, NULL,

2185

NULL, &error);

2485

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2486

&config, NULL, NULL, &ret_errno);

2186

2487

2187

2488

/* Free the Avahi configuration data */

2188

2489

avahi_server_config_free(&config);

2191

2492

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

2192

2493

if(mc.server == NULL){

2193

2494

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

2194

avahi_strerror(error));

2495

avahi_strerror(ret_errno));

2195

2496

exitcode = EX_UNAVAILABLE;

2196

2497

goto end;

2197

2498

}

2203

2504

/* Create the Avahi service browser */

2204

2505

sb = avahi_s_service_browser_new(mc.server, if_index,

2205

2506

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2206

NULL, 0, browse_callback, NULL);

2507

NULL, 0, browse_callback,

2508

(void *)&mc);

2207

2509

if(sb == NULL){

2208

2510

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

2209

2511

avahi_strerror(avahi_server_errno(mc.server)));

2220

2522

if(debug){

2221

2523

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

2222

2524

}

2223

2224

ret = avahi_loop_with_timeout(mc.simple_poll,

2225

(int)(retry_interval * 1000));

2525

2526

ret = avahi_loop_with_timeout(simple_poll,

2527

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

2226

2528

if(debug){

2227

2529

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

2228

2530

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

2235

2537

}

2236

2538

2237

2539

/* Cleanup things */

2540

free(mc.interfaces);

2541

2238

2542

if(sb != NULL)

2239

2543

avahi_s_service_browser_free(sb);

2240

2544

2241

2545

if(mc.server != NULL)

2242

2546

avahi_server_free(mc.server);

2243

2547

2244

if(mc.simple_poll != NULL)

2245

avahi_simple_poll_free(mc.simple_poll);

2548

if(simple_poll != NULL)

2549

avahi_simple_poll_free(simple_poll);

2246

2550

2247

2551

if(gnutls_initialized){

2248

2552

gnutls_certificate_free_credentials(mc.cred);

2260

2564

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

2261

2565

while(mc.current_server != NULL){

2262

2566

server *next = mc.current_server->next;

2567

#ifdef __GNUC__

2568

#pragma GCC diagnostic push

2569

#pragma GCC diagnostic ignored "-Wcast-qual"

2570

#endif

2571

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

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic pop

2574

#endif

2263

2575

free(mc.current_server);

2264

2576

mc.current_server = next;

2265

2577

}

2266

2578

}

2267

2579

2268

/* Run network hooks */

2269

run_network_hooks("stop", interface, delay);

2270

2271

/* Re-raise priviliges */

2580

/* Re-raise privileges */

2272

2581

{

2273

raise_privileges();

2582

ret_errno = raise_privileges();

2583

if(ret_errno != 0){

2584

errno = ret_errno;

2585

perror_plus("Failed to raise privileges");

2586

} else {

2587

2588

/* Run network hooks */

2589

run_network_hooks("stop", interfaces_hooks != NULL ?

2590

interfaces_hooks : "", delay);

2591

2592

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

2593

{

2594

char *interface = NULL;

2595

while((interface=argz_next(interfaces_to_take_down,

2596

interfaces_to_take_down_size,

2597

interface))){

2598

ret_errno = take_down_interface(interface);

2599

if(ret_errno != 0){

2600

errno = ret_errno;

2601

perror_plus("Failed to take down interface");

2602

}

2603

}

2604

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

2605

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

2606

" down\n");

2607

}

2608

}

2609

}

2274

2610

2275

/* Take down the network interface */

2276

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

2277

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

2278

if(ret == -1){

2279

perror_plus("ioctl SIOCGIFFLAGS");

2280

} else if(network.ifr_flags & IFF_UP){

2281

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

2282

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

2283

if(ret == -1){

2284

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2285

}

2286

}

2287

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

2288

if(ret == -1){

2289

perror_plus("close");

2290

}

2611

ret_errno = lower_privileges_permanently();

2612

if(ret_errno != 0){

2613

errno = ret_errno;

2614

perror_plus("Failed to lower privileges permanently");

2291

2615

}

2292

2616

}

2293

/* Lower privileges permanently */

2294

errno = 0;

2295

ret = setuid(uid);

2296

if(ret == -1){

2297

perror_plus("setuid");

2298

}

2617

2618

free(interfaces_to_take_down);

2619

free(interfaces_hooks);

2299

2620

2300

2621

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

2301

if(tempdir_created){

2622

if(tempdir != NULL){

2302

2623

struct dirent **direntries = NULL;

2303

struct dirent *direntry = NULL;

2304

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

2305

alphasort);

2306

if (numentries > 0){

2307

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

2308

direntry = direntries[i];

2309

char *fullname = NULL;

2310

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

2311

direntry->d_name);

2312

if(ret < 0){

2313

perror_plus("asprintf");

2314

continue;

2315

}

2316

ret = remove(fullname);

2317

if(ret == -1){

2318

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

2319

strerror(errno));

2320

}

2321

free(fullname);

2624

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

2625

O_NOFOLLOW));

2626

if(tempdir_fd == -1){

2627

perror_plus("open");

2628

} else {

2629

#ifdef __GLIBC__

2630

#if __GLIBC_PREREQ(2, 15)

2631

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

2632

notdotentries, alphasort);

2633

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

2634

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

2635

alphasort);

2636

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

2637

#else /* not __GLIBC__ */

2638

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

2639

alphasort);

2640

#endif /* not __GLIBC__ */

2641

if(numentries >= 0){

2642

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

2643

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

2644

if(ret == -1){

2645

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

2646

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

2647

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

2648

}

2649

free(direntries[i]);

2650

}

2651

2652

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

2653

free(direntries);

2654

if(numentries == -1){

2655

perror_plus("scandir");

2656

}

2657

ret = rmdir(tempdir);

2658

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

2659

perror_plus("rmdir");

2660

}

2322

2661

}

2323

}

2324

2325

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

2326

free(direntries);

2327

if (numentries == -1){

2328

perror_plus("scandir");

2329

}

2330

ret = rmdir(tempdir);

2331

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

2332

perror_plus("rmdir");

2662

TEMP_FAILURE_RETRY(close(tempdir_fd));

2333

2663

}

2334

2664

}

2335

2665