/mandos/trunk : revision 714

9

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

10

*

11

* Everything else is

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13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

32

/* Needed by GPGME, specifically gpgme_data_seek() */

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

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

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42

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

43

stdout, ferror(), remove() */

44

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

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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(),

47

strtof(), abort() */

55

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() */

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

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

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program_invocation_short_name */

67

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

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() */

77

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

76

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

77

unlinkat() */

78

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

78

79

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

79

80

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

80

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argp_state, struct argp,

88

89

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

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WEXITSTATUS(), WTERMSIG() */

90

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#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(),

95

argz_count() */

96

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

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EAI_SYSTEM, gai_strerror() */

91

98

92

99

#ifdef __linux__

93

100

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

135

142

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

136

143

char *connect_to = NULL;

137

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

138

148

139

149

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

140

150

typedef struct server{

141

151

const char *ip;

142

uint16_t port;

152

in_port_t port;

143

153

AvahiIfIndex if_index;

144

154

int af;

145

155

struct timespec last_seen;

149

159

150

160

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

151

161

typedef struct {

152

AvahiSimplePoll *simple_poll;

153

162

AvahiServer *server;

154

163

gnutls_certificate_credentials_t cred;

155

164

unsigned int dh_bits;

157

166

const char *priority;

158

167

gpgme_ctx_t ctx;

159

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

160

171

} mandos_context;

161

172

162

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

163

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

164

.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

167

175

168

176

sig_atomic_t quit_now = 0;

169

177

int signal_received = 0;

177

185

perror(print_text);

178

186

}

179

187

180

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

188

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

181

189

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

182

190

va_list ap;

183

191

va_start (ap, format);

184

192

185

193

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

186

194

program_invocation_short_name));

187

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

195

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

188

196

}

189

197

190

198

/*

192

200

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

193

201

* "buffer_length" is how much is already used.

194

202

*/

203

__attribute__((nonnull, warn_unused_result))

195

204

size_t incbuffer(char **buffer, size_t buffer_length,

196

205

size_t buffer_capacity){

197

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

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

199

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;

200

213

return 0;

201

214

}

215

*buffer = new_buf;

202

216

buffer_capacity += BUFFER_SIZE;

203

217

}

204

218

return buffer_capacity;

205

219

}

206

220

207

221

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

208

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

209

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){

210

225

int ret;

211

226

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

212

227

if(new_server == NULL){

219

234

.af = af };

220

235

if(new_server->ip == NULL){

221

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);

222

252

return false;

223

253

}

224

254

/* Special case of first server */

225

if (mc.current_server == NULL){

255

if(*current_server == NULL){

226

256

new_server->next = new_server;

227

257

new_server->prev = new_server;

228

mc.current_server = new_server;

229

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

258

*current_server = new_server;

230

259

} else {

231

new_server->next = mc.current_server;

232

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;

233

263

new_server->prev->next = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

264

(*current_server)->prev = new_server;

240

265

}

241

266

return true;

242

267

}

244

269

/*

245

270

* Initialize GPGME.

246

271

*/

247

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

248

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){

249

277

gpgme_error_t rc;

250

278

gpgme_engine_info_t engine_info;

251

279

252

253

280

/*

254

281

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

255

282

*/

256

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

257

284

int ret;

258

285

int fd;

259

286

gpgme_data_t pgp_data;

271

298

return false;

272

299

}

273

300

274

rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

275

302

if(rc != GPG_ERR_NO_ERROR){

276

303

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

277

304

gpgme_strsource(rc), gpgme_strerror(rc));

321

348

}

322

349

323

350

/* Create new GPGME "context" */

324

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

351

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

325

352

if(rc != GPG_ERR_NO_ERROR){

326

353

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

327

354

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

340

367

* Decrypt OpenPGP data.

341

368

* Returns -1 on error

342

369

*/

370

__attribute__((nonnull, warn_unused_result))

343

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

344

372

size_t crypto_size,

345

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

346

375

gpgme_data_t dh_crypto, dh_plain;

347

376

gpgme_error_t rc;

348

377

ssize_t ret;

374

403

375

404

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

376

405

data buffer */

377

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

406

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

378

407

if(rc != GPG_ERR_NO_ERROR){

379

408

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

380

409

gpgme_strsource(rc), gpgme_strerror(rc));

381

410

plaintext_length = -1;

382

411

if(debug){

383

412

gpgme_decrypt_result_t result;

384

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

385

414

if(result == NULL){

386

415

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

387

416

} else {

464

493

return plaintext_length;

465

494

}

466

495

467

static const char * safer_gnutls_strerror(int value){

468

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

469

-Wunreachable-code */

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

470

499

if(ret == NULL)

471

500

ret = "(unknown)";

472

501

return ret;

473

502

}

474

503

475

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

476

506

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

477

507

const char* string){

478

508

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

479

509

}

480

510

511

__attribute__((nonnull, warn_unused_result))

481

512

static int init_gnutls_global(const char *pubkeyfilename,

482

const char *seckeyfilename){

513

const char *seckeyfilename,

514

mandos_context *mc){

483

515

int ret;

484

516

485

517

if(debug){

502

534

}

503

535

504

536

/* OpenPGP credentials */

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

506

538

if(ret != GNUTLS_E_SUCCESS){

507

539

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

508

540

safer_gnutls_strerror(ret));

518

550

}

519

551

520

552

ret = gnutls_certificate_set_openpgp_key_file

521

(mc.cred, pubkeyfilename, seckeyfilename,

553

(mc->cred, pubkeyfilename, seckeyfilename,

522

554

GNUTLS_OPENPGP_FMT_BASE64);

523

555

if(ret != GNUTLS_E_SUCCESS){

524

556

fprintf_plus(stderr,

530

562

}

531

563

532

564

/* GnuTLS server initialization */

533

ret = gnutls_dh_params_init(&mc.dh_params);

565

ret = gnutls_dh_params_init(&mc->dh_params);

534

566

if(ret != GNUTLS_E_SUCCESS){

535

567

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

568

" initialization: %s\n",

537

569

safer_gnutls_strerror(ret));

538

570

goto globalfail;

539

571

}

540

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

572

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

541

573

if(ret != GNUTLS_E_SUCCESS){

542

574

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

543

575

safer_gnutls_strerror(ret));

544

576

goto globalfail;

545

577

}

546

578

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

579

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

548

580

549

581

return 0;

550

582

551

583

globalfail:

552

584

553

gnutls_certificate_free_credentials(mc.cred);

585

gnutls_certificate_free_credentials(mc->cred);

554

586

gnutls_global_deinit();

555

gnutls_dh_params_deinit(mc.dh_params);

587

gnutls_dh_params_deinit(mc->dh_params);

556

588

return -1;

557

589

}

558

590

559

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){

560

594

int ret;

561

595

/* GnuTLS session creation */

562

596

do {

574

608

{

575

609

const char *err;

576

610

do {

577

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

611

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

578

612

if(quit_now){

579

613

gnutls_deinit(*session);

580

614

return -1;

591

625

592

626

do {

593

627

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

594

mc.cred);

628

mc->cred);

595

629

if(quit_now){

596

630

gnutls_deinit(*session);

597

631

return -1;

607

641

/* ignore client certificate if any. */

608

642

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

609

643

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

611

645

612

646

return 0;

613

647

}

617

651

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

618

652

619

653

/* Called when a Mandos server is found */

620

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,

621

656

AvahiIfIndex if_index,

622

int af){

657

int af, mandos_context *mc){

623

658

int ret, tcp_sd = -1;

624

659

ssize_t sret;

625

union {

626

struct sockaddr_in in;

627

struct sockaddr_in6 in6;

628

} to;

660

struct sockaddr_storage to;

629

661

char *buffer = NULL;

630

662

char *decrypted_buffer = NULL;

631

663

size_t buffer_length = 0;

655

687

return -1;

656

688

}

657

689

658

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);

659

723

if(ret != 0){

660

724

return -1;

661

725

}

662

726

663

727

if(debug){

664

728

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

665

PRIu16 "\n", ip, port);

729

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

666

730

}

667

731

668

732

tcp_sd = socket(pf, SOCK_STREAM, 0);

680

744

681

745

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

682

746

if(af == AF_INET6){

683

to.in6.sin6_family = (sa_family_t)af;

684

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);

685

749

} else { /* IPv4 */

686

to.in.sin_family = (sa_family_t)af;

687

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);

688

752

}

689

753

if(ret < 0 ){

690

754

int e = errno;

699

763

goto mandos_end;

700

764

}

701

765

if(af == AF_INET6){

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

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

708

-Wunreachable-code*/

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

709

769

if(if_index == AVAHI_IF_UNSPEC){

710

770

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

711

771

" incomplete without a network interface\n");

713

773

goto mandos_end;

714

774

}

715

775

/* Set the network interface number as scope */

716

to.in6.sin6_scope_id = (uint32_t)if_index;

776

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

717

777

}

718

778

} else {

719

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

720

-Wconversion and

721

-Wunreachable-code */

779

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

722

780

}

723

781

724

782

if(quit_now){

732

790

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

733

791

perror_plus("if_indextoname");

734

792

} else {

735

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

736

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

793

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

794

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

737

795

}

738

796

} else {

739

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

740

ip, port);

797

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

798

ip, (uintmax_t)port);

741

799

}

742

800

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

801

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

744

const char *pcret;

745

802

if(af == AF_INET6){

746

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

747

sizeof(addrstr));

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

748

807

} else {

749

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

750

sizeof(addrstr));

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

751

812

}

752

if(pcret == NULL){

753

perror_plus("inet_ntop");

754

} else {

755

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

756

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

757

}

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);

758

819

}

759

820

}

760

821

764

825

}

765

826

766

827

if(af == AF_INET6){

767

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

828

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

829

sizeof(struct sockaddr_in6));

768

830

} else {

769

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

831

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

832

sizeof(struct sockaddr_in));

770

833

}

771

834

if(ret < 0){

772

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

835

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

773

836

int e = errno;

774

837

perror_plus("connect");

775

838

errno = e;

821

884

goto mandos_end;

822

885

}

823

886

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

887

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

888

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

889

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

890

gnutls_transport_set_ptr(session,

891

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

826

892

827

893

if(quit_now){

828

894

errno = EINTR;

933

999

if(buffer_length > 0){

934

1000

ssize_t decrypted_buffer_size;

935

1001

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

936

&decrypted_buffer);

1002

&decrypted_buffer, mc);

937

1003

if(decrypted_buffer_size >= 0){

938

1004

939

1005

written = 0;

987

1053

return retval;

988

1054

}

989

1055

1056

__attribute__((nonnull))

990

1057

static void resolve_callback(AvahiSServiceResolver *r,

991

1058

AvahiIfIndex interface,

992

1059

AvahiProtocol proto,

1000

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

1001

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1002

1069

flags,

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1070

void *mc){

1071

if(r == NULL){

1072

return;

1073

}

1005

1074

1006

1075

/* Called whenever a service has been resolved successfully or

1007

1076

timed out */

1016

1085

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

1017

1086

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

1018

1087

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

1088

avahi_strerror(avahi_server_errno

1089

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

1020

1090

break;

1021

1091

1022

1092

case AVAHI_RESOLVER_FOUND:

1028

1098

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

1029

1099

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

1030

1100

}

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1101

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

1102

interface,

1103

avahi_proto_to_af(proto),

1104

mc);

1033

1105

if(ret == 0){

1034

avahi_simple_poll_quit(mc.simple_poll);

1106

avahi_simple_poll_quit(simple_poll);

1035

1107

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1108

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

1109

avahi_proto_to_af(proto),

1110

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

1038

1111

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

1039

1112

" list\n", name);

1040

1113

}

1053

1126

const char *domain,

1054

1127

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1055

1128

flags,

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1129

void *mc){

1130

if(b == NULL){

1131

return;

1132

}

1058

1133

1059

1134

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

1060

1135

is removed from the LAN */

1068

1143

case AVAHI_BROWSER_FAILURE:

1069

1144

1070

1145

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1146

avahi_strerror(avahi_server_errno

1147

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

1148

avahi_simple_poll_quit(simple_poll);

1073

1149

return;

1074

1150

1075

1151

case AVAHI_BROWSER_NEW:

1078

1154

the callback function is called the Avahi server will free the

1079

1155

resolver for us. */

1080

1156

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1157

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

1158

interface, protocol, name, type,

1159

domain, protocol, 0,

1160

resolve_callback, mc) == NULL)

1084

1161

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

1085

1162

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

1163

avahi_strerror(avahi_server_errno

1164

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

1087

1165

break;

1088

1166

1089

1167

case AVAHI_BROWSER_REMOVE:

1108

1186

signal_received = sig;

1109

1187

int old_errno = errno;

1110

1188

/* set main loop to exit */

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1189

if(simple_poll != NULL){

1190

avahi_simple_poll_quit(simple_poll);

1113

1191

}

1114

1192

errno = old_errno;

1115

1193

}

1116

1194

1195

__attribute__((nonnull, warn_unused_result))

1117

1196

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

1118

1197

int ret;

1198

error_t ret_errno;

1119

1199

1120

1200

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

1121

1201

if(s < 0){

1202

ret_errno = errno;

1122

1203

perror_plus("socket");

1204

errno = ret_errno;

1123

1205

return false;

1124

1206

}

1125

1207

strcpy(ifr->ifr_name, ifname);

1126

1208

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

1209

if(ret == -1){

1128

1210

if(debug){

1211

ret_errno = errno;

1129

1212

perror_plus("ioctl SIOCGIFFLAGS");

1213

errno = ret_errno;

1130

1214

}

1131

1215

return false;

1132

1216

}

1133

1217

return true;

1134

1218

}

1135

1219

1220

__attribute__((nonnull, warn_unused_result))

1136

1221

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

1137

1222

1138

1223

/* Reject the loopback device */

1180

1265

* corresponds to an acceptable network device.

1181

1266

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

1182

1267

*/

1268

__attribute__((nonnull, warn_unused_result))

1183

1269

int good_interface(const struct dirent *if_entry){

1184

1270

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

1185

1271

return 0;

1201

1287

}

1202

1288

1203

1289

/*

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1244

}

1245

1290

* This function determines if a network interface is up.

1291

*/

1292

__attribute__((nonnull, warn_unused_result))

1293

bool interface_is_up(const char *interface){

1294

struct ifreq ifr;

1295

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

1296

if(debug){

1297

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

1298

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

1299

}

1300

return false;

1301

}

1302

1303

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

1304

}

1305

1306

/*

1307

* This function determines if a network interface is running

1308

*/

1309

__attribute__((nonnull, warn_unused_result))

1310

bool interface_is_running(const char *interface){

1311

struct ifreq ifr;

1312

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

1313

if(debug){

1314

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

1315

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

1316

}

1317

return false;

1318

}

1319

1320

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

1321

}

1322

1323

__attribute__((nonnull, pure, warn_unused_result))

1246

1324

int notdotentries(const struct dirent *direntry){

1247

1325

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

1248

1326

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

1255

1333

}

1256

1334

1257

1335

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

1336

__attribute__((nonnull, warn_unused_result))

1258

1337

int runnable_hook(const struct dirent *direntry){

1259

1338

int ret;

1260

1339

size_t sret;

1268

1347

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

1269

1348

"abcdefghijklmnopqrstuvwxyz"

1270

1349

"0123456789"

1271

"_-");

1350

"_.-");

1272

1351

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

1273

1352

/* Contains non-allowed characters */

1274

1353

if(debug){

1278

1357

return 0;

1279

1358

}

1280

1359

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1360

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

1289

1361

if(ret == -1){

1290

1362

if(debug){

1291

1363

perror_plus("Could not stat hook");

1315

1387

return 1;

1316

1388

}

1317

1389

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1390

__attribute__((nonnull, warn_unused_result))

1391

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1392

mandos_context *mc){

1319

1393

int ret;

1320

1394

struct timespec now;

1321

1395

struct timespec waited_time;

1322

1396

intmax_t block_time;

1323

1397

1324

1398

while(true){

1325

if(mc.current_server == NULL){

1326

if (debug){

1399

if(mc->current_server == NULL){

1400

if(debug){

1327

1401

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

1328

1402

" No timeout!\n");

1329

1403

}

1330

1404

ret = avahi_simple_poll_iterate(s, -1);

1331

1405

} else {

1332

if (debug){

1406

if(debug){

1333

1407

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

1334

1408

" it, or wait\n");

1335

1409

}

1342

1416

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

1343

1417

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

1344

1418

waited_time.tv_sec = (now.tv_sec

1345

- mc.current_server->last_seen.tv_sec);

1419

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

1346

1420

waited_time.tv_nsec = (now.tv_nsec

1347

- mc.current_server->last_seen.tv_nsec);

1421

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

1348

1422

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

1349

1423

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

1350

1424

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

1352

1426

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

1353

1427

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

1354

1428

1355

if (debug){

1429

if(debug){

1356

1430

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

1357

1431

block_time);

1358

1432

}

1359

1433

1360

1434

if(block_time <= 0){

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

1435

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

1436

mc->current_server->port,

1437

mc->current_server->if_index,

1438

mc->current_server->af, mc);

1365

1439

if(ret == 0){

1366

avahi_simple_poll_quit(mc.simple_poll);

1440

avahi_simple_poll_quit(s);

1367

1441

return 0;

1368

1442

}

1369

1443

ret = clock_gettime(CLOCK_MONOTONIC,

1370

&mc.current_server->last_seen);

1444

&mc->current_server->last_seen);

1371

1445

if(ret == -1){

1372

1446

perror_plus("clock_gettime");

1373

1447

return -1;

1374

1448

}

1375

mc.current_server = mc.current_server->next;

1449

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

1376

1450

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

1377

1451

servers, but don't block */

1378

1452

}

1380

1454

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

1381

1455

}

1382

1456

if(ret != 0){

1383

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

1457

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

1384

1458

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

1385

1459

}

1386

1460

}

1387

1461

}

1388

1462

}

1389

1463

1390

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

1464

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

1465

__attribute__((warn_unused_result))

1466

error_t raise_privileges(void){

1467

error_t old_errno = errno;

1468

error_t ret_errno = 0;

1469

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

1470

ret_errno = errno;

1471

}

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

1476

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

1477

__attribute__((warn_unused_result))

1478

error_t raise_privileges_permanently(void){

1479

error_t old_errno = errno;

1480

error_t ret_errno = raise_privileges();

1481

if(ret_errno != 0){

1482

errno = old_errno;

1483

return ret_errno;

1484

}

1485

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

1486

ret_errno = errno;

1487

}

1488

errno = old_errno;

1489

return ret_errno;

1490

}

1491

1492

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

1493

__attribute__((warn_unused_result))

1494

error_t lower_privileges(void){

1495

error_t old_errno = errno;

1496

error_t ret_errno = 0;

1497

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

1498

ret_errno = errno;

1499

}

1500

errno = old_errno;

1501

return ret_errno;

1502

}

1503

1504

/* Lower privileges permanently */

1505

__attribute__((warn_unused_result))

1506

error_t lower_privileges_permanently(void){

1507

error_t old_errno = errno;

1508

error_t ret_errno = 0;

1509

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

1510

ret_errno = errno;

1511

}

1512

errno = old_errno;

1513

return ret_errno;

1514

}

1515

1516

__attribute__((nonnull))

1517

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

1391

1518

const float delay){

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1519

struct dirent **direntries = NULL;

1520

if(hookdir_fd == -1){

1521

hookdir_fd = open(hookdir, O_RDONLY);

1522

if(hookdir_fd == -1){

1523

if(errno == ENOENT){

1524

if(debug){

1525

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

1526

" found\n", hookdir);

1527

}

1528

} else {

1529

perror_plus("open");

1530

}

1531

return;

1532

}

1533

}

1534

#ifdef __GLIBC__

1535

#if __GLIBC_PREREQ(2, 15)

1536

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

1537

runnable_hook, alphasort);

1538

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

1539

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

1540

alphasort);

1541

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

1542

#else /* not __GLIBC__ */

1543

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

1544

alphasort);

1545

#endif /* not __GLIBC__ */

1397

1546

if(numhooks == -1){

1398

1547

perror_plus("scandir");

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

1548

return;

1549

}

1550

struct dirent *direntry;

1551

int ret;

1552

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

1553

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

1554

direntry = direntries[i];

1555

if(debug){

1556

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

1557

direntry->d_name);

1558

}

1559

pid_t hook_pid = fork();

1560

if(hook_pid == 0){

1561

/* Child */

1562

/* Raise privileges */

1563

errno = raise_privileges_permanently();

1564

if(errno != 0){

1565

perror_plus("Failed to raise privileges");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Set group */

1569

errno = 0;

1570

ret = setgid(0);

1571

if(ret == -1){

1572

perror_plus("setgid");

1573

_exit(EX_NOPERM);

1574

}

1575

/* Reset supplementary groups */

1576

errno = 0;

1577

ret = setgroups(0, NULL);

1578

if(ret == -1){

1579

perror_plus("setgroups");

1580

_exit(EX_NOPERM);

1581

}

1582

ret = dup2(devnull, STDIN_FILENO);

1583

if(ret == -1){

1584

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

1585

_exit(EX_OSERR);

1586

}

1587

ret = close(devnull);

1588

if(ret == -1){

1589

perror_plus("close");

1590

_exit(EX_OSERR);

1591

}

1592

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1593

if(ret == -1){

1594

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

1595

_exit(EX_OSERR);

1596

}

1597

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

1598

if(ret == -1){

1599

perror_plus("setenv");

1600

_exit(EX_OSERR);

1601

}

1602

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

1603

if(ret == -1){

1604

perror_plus("setenv");

1605

_exit(EX_OSERR);

1606

}

1607

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

1608

if(ret == -1){

1609

perror_plus("setenv");

1610

_exit(EX_OSERR);

1611

}

1612

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

1613

if(ret == -1){

1614

perror_plus("setenv");

1615

_exit(EX_OSERR);

1616

}

1617

char *delaystring;

1618

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

1619

if(ret == -1){

1406

1620

perror_plus("asprintf");

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

1621

_exit(EX_OSERR);

1622

}

1623

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

1624

if(ret == -1){

1475

1625

free(delaystring);

1476

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

1477

perror_plus("execl");

1478

_exit(EXIT_FAILURE);

1479

}

1480

} else {

1481

int status;

1482

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

1483

perror_plus("waitpid");

1484

free(fullname);

1485

continue;

1486

}

1487

if(WIFEXITED(status)){

1488

if(WEXITSTATUS(status) != 0){

1489

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

1490

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

1491

WEXITSTATUS(status));

1492

free(fullname);

1493

continue;

1494

}

1495

} else if(WIFSIGNALED(status)){

1496

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

1497

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

1498

WTERMSIG(status));

1499

free(fullname);

1500

continue;

1501

} else {

1502

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

1503

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

1504

free(fullname);

1505

continue;

1506

}

1507

}

1508

free(fullname);

1509

if(debug){

1510

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

1511

direntry->d_name);

1512

}

1513

}

1514

close(devnull);

1515

}

1516

return true;

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

free(delaystring);

1630

if(connect_to != NULL){

1631

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

1632

if(ret == -1){

1633

perror_plus("setenv");

1634

_exit(EX_OSERR);

1635

}

1636

}

1637

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

1638

if(hook_fd == -1){

1639

perror_plus("openat");

1640

_exit(EXIT_FAILURE);

1641

}

1642

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

1643

perror_plus("close");

1644

_exit(EXIT_FAILURE);

1645

}

1646

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

1647

environ) == -1){

1648

perror_plus("fexecve");

1649

_exit(EXIT_FAILURE);

1650

}

1651

} else {

1652

int status;

1653

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

1654

perror_plus("waitpid");

1655

continue;

1656

}

1657

if(WIFEXITED(status)){

1658

if(WEXITSTATUS(status) != 0){

1659

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

1660

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

1661

WEXITSTATUS(status));

1662

continue;

1663

}

1664

} else if(WIFSIGNALED(status)){

1665

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

1666

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

1667

WTERMSIG(status));

1668

continue;

1669

} else {

1670

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

1671

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

1672

continue;

1673

}

1674

}

1675

if(debug){

1676

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

1677

direntry->d_name);

1678

}

1679

}

1680

free(direntries);

1681

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

1682

perror_plus("close");

1683

} else {

1684

hookdir_fd = -1;

1685

}

1686

close(devnull);

1687

}

1688

1689

__attribute__((nonnull, warn_unused_result))

1690

error_t bring_up_interface(const char *const interface,

1691

const float delay){

1692

error_t old_errno = errno;

1693

int ret;

1694

struct ifreq network;

1695

unsigned int if_index = if_nametoindex(interface);

1696

if(if_index == 0){

1697

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

1698

errno = old_errno;

1699

return ENXIO;

1700

}

1701

1702

if(quit_now){

1703

errno = old_errno;

1704

return EINTR;

1705

}

1706

1707

if(not interface_is_up(interface)){

1708

error_t ret_errno = 0, ioctl_errno = 0;

1709

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

1710

ret_errno = errno;

1711

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

1712

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

1713

errno = old_errno;

1714

return ret_errno;

1715

}

1716

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

1717

1718

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

1719

if(sd == -1){

1720

ret_errno = errno;

1721

perror_plus("socket");

1722

errno = old_errno;

1723

return ret_errno;

1724

}

1725

1726

if(quit_now){

1727

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

1728

if(ret == -1){

1729

perror_plus("close");

1730

}

1731

errno = old_errno;

1732

return EINTR;

1733

}

1734

1735

if(debug){

1736

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

1737

interface);

1738

}

1739

1740

/* Raise privileges */

1741

ret_errno = raise_privileges();

1742

if(ret_errno != 0){

1743

errno = ret_errno;

1744

perror_plus("Failed to raise privileges");

1745

}

1746

1747

#ifdef __linux__

1748

int ret_linux;

1749

bool restore_loglevel = false;

1750

if(ret_errno == 0){

1751

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1752

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

1753

ret_linux = klogctl(8, NULL, 5);

1754

if(ret_linux == -1){

1755

perror_plus("klogctl");

1756

} else {

1757

restore_loglevel = true;

1758

}

1759

}

1760

#endif /* __linux__ */

1761

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

1762

ioctl_errno = errno;

1763

#ifdef __linux__

1764

if(restore_loglevel){

1765

ret_linux = klogctl(7, NULL, 0);

1766

if(ret_linux == -1){

1767

perror_plus("klogctl");

1768

}

1769

}

1770

#endif /* __linux__ */

1771

1772

/* If raise_privileges() succeeded above */

1773

if(ret_errno == 0){

1774

/* Lower privileges */

1775

ret_errno = lower_privileges();

1776

if(ret_errno != 0){

1777

errno = ret_errno;

1778

perror_plus("Failed to lower privileges");

1779

}

1780

}

1781

1782

/* Close the socket */

1783

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

1784

if(ret == -1){

1785

perror_plus("close");

1786

}

1787

1788

if(ret_setflags == -1){

1789

errno = ioctl_errno;

1790

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1791

errno = old_errno;

1792

return ioctl_errno;

1793

}

1794

} else if(debug){

1795

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

1796

interface);

1797

}

1798

1799

/* Sleep checking until interface is running.

1800

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

1801

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

1802

if(interface_is_running(interface)){

1803

break;

1804

}

1805

struct timespec sleeptime = { .tv_nsec = 250000000 };

1806

ret = nanosleep(&sleeptime, NULL);

1807

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

1808

perror_plus("nanosleep");

1809

}

1810

}

1811

1812

errno = old_errno;

1813

return 0;

1814

}

1815

1816

__attribute__((nonnull, warn_unused_result))

1817

error_t take_down_interface(const char *const interface){

1818

error_t old_errno = errno;

1819

struct ifreq network;

1820

unsigned int if_index = if_nametoindex(interface);

1821

if(if_index == 0){

1822

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

1823

errno = old_errno;

1824

return ENXIO;

1825

}

1826

if(interface_is_up(interface)){

1827

error_t ret_errno = 0, ioctl_errno = 0;

1828

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

1829

ret_errno = errno;

1830

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

1831

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

1832

errno = old_errno;

1833

return ret_errno;

1834

}

1835

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

1836

1837

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

1838

if(sd == -1){

1839

ret_errno = errno;

1840

perror_plus("socket");

1841

errno = old_errno;

1842

return ret_errno;

1843

}

1844

1845

if(debug){

1846

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

1847

interface);

1848

}

1849

1850

/* Raise privileges */

1851

ret_errno = raise_privileges();

1852

if(ret_errno != 0){

1853

errno = ret_errno;

1854

perror_plus("Failed to raise privileges");

1855

}

1856

1857

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

1858

ioctl_errno = errno;

1859

1860

/* If raise_privileges() succeeded above */

1861

if(ret_errno == 0){

1862

/* Lower privileges */

1863

ret_errno = lower_privileges();

1864

if(ret_errno != 0){

1865

errno = ret_errno;

1866

perror_plus("Failed to lower privileges");

1867

}

1868

}

1869

1870

/* Close the socket */

1871

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

1872

if(ret == -1){

1873

perror_plus("close");

1874

}

1875

1876

if(ret_setflags == -1){

1877

errno = ioctl_errno;

1878

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1879

errno = old_errno;

1880

return ioctl_errno;

1881

}

1882

} else if(debug){

1883

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

1884

interface);

1885

}

1886

1887

errno = old_errno;

1888

return 0;

1517

1889

}

1518

1890

1519

1891

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

1892

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

1893

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

1894

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

1895

.interfaces = NULL, .interfaces_size = 0 };

1520

1896

AvahiSServiceBrowser *sb = NULL;

1521

int error;

1897

error_t ret_errno;

1522

1898

int ret;

1523

1899

intmax_t tmpmax;

1524

1900

char *tmp;

1525

1901

int exitcode = EXIT_SUCCESS;

1526

const char *interface = "";

1527

struct ifreq network;

1528

int sd = -1;

1529

bool take_down_interface = false;

1530

uid_t uid;

1531

gid_t gid;

1532

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

1533

bool tempdir_created = false;

1902

char *interfaces_to_take_down = NULL;

1903

size_t interfaces_to_take_down_size = 0;

1904

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

1905

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

1906

char *tempdir = NULL;

1534

1907

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1535

1908

const char *seckey = PATHDIR "/" SECKEY;

1536

1909

const char *pubkey = PATHDIR "/" PUBKEY;

1910

char *interfaces_hooks = NULL;

1537

1911

1538

1912

bool gnutls_initialized = false;

1539

1913

bool gpgme_initialized = false;

1601

1975

.group = 2 },

1602

1976

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

1603

1977

.arg = "SECONDS",

1604

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

1978

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

1605

1979

.group = 2 },

1606

1980

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

1607

1981

.arg = "DIR",

1630

2004

connect_to = arg;

1631

2005

break;

1632

2006

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

1633

interface = arg;

2007

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

2008

arg, (int)',');

2009

if(ret_errno != 0){

2010

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

2011

}

1634

2012

break;

1635

2013

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

1636

2014

seckey = arg;

1713

2091

/* Work around Debian bug #633582:

1714

2092

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

1715

2093

1716

/* Re-raise priviliges */

1717

errno = 0;

1718

ret = seteuid(0);

1719

if(ret == -1){

1720

perror_plus("seteuid");

2094

/* Re-raise privileges */

2095

ret_errno = raise_privileges();

2096

if(ret_errno != 0){

2097

errno = ret_errno;

2098

perror_plus("Failed to raise privileges");

1721

2099

} else {

1722

2100

struct stat st;

1723

2101

1764

2142

}

1765

2143

1766

2144

/* Lower privileges */

1767

errno = 0;

1768

ret = seteuid(uid);

1769

if(ret == -1){

1770

perror_plus("seteuid");

2145

ret_errno = lower_privileges();

2146

if(ret_errno != 0){

2147

errno = ret_errno;

2148

perror_plus("Failed to lower privileges");

2149

}

2150

}

2151

}

2152

2153

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

2154

{

2155

char *interface = NULL;

2156

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

2157

interface))){

2158

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

2159

and if_nametoindex(interface) == 0){

2160

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

2161

fprintf_plus(stderr, "Not using nonexisting interface"

2162

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

2163

}

2164

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

2165

interface = NULL;

1771

2166

}

1772

2167

}

1773

2168

}

1774

2169

1775

2170

/* Run network hooks */

1776

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

1777

goto end;

2171

{

2172

if(mc.interfaces != NULL){

2173

interfaces_hooks = malloc(mc.interfaces_size);

2174

if(interfaces_hooks == NULL){

2175

perror_plus("malloc");

2176

goto end;

2177

}

2178

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

2179

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

2180

}

2181

run_network_hooks("start", interfaces_hooks != NULL ?

2182

interfaces_hooks : "", delay);

1778

2183

}

1779

2184

1780

2185

if(not debug){

1781

2186

avahi_set_log_function(empty_log);

1782

2187

}

1783

2188

1784

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

1785

struct dirent **direntries;

1786

/* First look for interfaces that are up */

1787

ret = scandir(sys_class_net, &direntries, up_interface,

1788

alphasort);

1789

if(ret == 0){

1790

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

1791

free(direntries);

1792

ret = scandir(sys_class_net, &direntries, good_interface,

1793

alphasort);

1794

}

1795

if(ret >= 1){

1796

/* Pick the first interface returned */

1797

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

1798

if(debug){

1799

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

1800

}

1801

if(interface == NULL){

1802

perror_plus("malloc");

1803

free(direntries);

1804

exitcode = EXIT_FAILURE;

1805

goto end;

1806

}

1807

free(direntries);

1808

} else {

1809

free(direntries);

1810

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

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

}

1815

1816

2189

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

1817

2190

from the signal handler */

1818

2191

/* Initialize the pseudo-RNG for Avahi */

1819

2192

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

1820

mc.simple_poll = avahi_simple_poll_new();

1821

if(mc.simple_poll == NULL){

2193

simple_poll = avahi_simple_poll_new();

2194

if(simple_poll == NULL){

1822

2195

fprintf_plus(stderr,

1823

2196

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

1824

2197

exitcode = EX_UNAVAILABLE;

1888

2261

}

1889

2262

}

1890

2263

1891

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

1892

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

1893

if_index = (AvahiIfIndex) if_nametoindex(interface);

1894

if(if_index == 0){

1895

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

1896

exitcode = EX_UNAVAILABLE;

1897

goto end;

1898

}

1899

1900

if(quit_now){

1901

goto end;

1902

}

1903

1904

/* Re-raise priviliges */

1905

errno = 0;

1906

ret = seteuid(0);

1907

if(ret == -1){

1908

perror_plus("seteuid");

1909

}

1910

1911

#ifdef __linux__

1912

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1913

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

1914

ret = klogctl(8, NULL, 5);

1915

bool restore_loglevel = true;

1916

if(ret == -1){

1917

restore_loglevel = false;

1918

perror_plus("klogctl");

1919

}

1920

#endif /* __linux__ */

1921

1922

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1923

if(sd < 0){

1924

perror_plus("socket");

1925

exitcode = EX_OSERR;

1926

#ifdef __linux__

1927

if(restore_loglevel){

1928

ret = klogctl(7, NULL, 0);

1929

if(ret == -1){

1930

perror_plus("klogctl");

1931

}

1932

}

1933

#endif /* __linux__ */

1934

/* Lower privileges */

1935

errno = 0;

1936

ret = seteuid(uid);

1937

if(ret == -1){

1938

perror_plus("seteuid");

1939

}

1940

goto end;

1941

}

1942

strcpy(network.ifr_name, interface);

1943

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

1944

if(ret == -1){

1945

perror_plus("ioctl SIOCGIFFLAGS");

1946

#ifdef __linux__

1947

if(restore_loglevel){

1948

ret = klogctl(7, NULL, 0);

1949

if(ret == -1){

1950

perror_plus("klogctl");

1951

}

1952

}

1953

#endif /* __linux__ */

1954

exitcode = EX_OSERR;

1955

/* Lower privileges */

1956

errno = 0;

1957

ret = seteuid(uid);

1958

if(ret == -1){

1959

perror_plus("seteuid");

1960

}

1961

goto end;

1962

}

1963

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

1964

network.ifr_flags |= IFF_UP;

1965

take_down_interface = true;

1966

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

1967

if(ret == -1){

1968

take_down_interface = false;

1969

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1970

exitcode = EX_OSERR;

1971

#ifdef __linux__

1972

if(restore_loglevel){

1973

ret = klogctl(7, NULL, 0);

1974

if(ret == -1){

1975

perror_plus("klogctl");

2264

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

2265

if(mc.interfaces == NULL){

2266

struct dirent **direntries = NULL;

2267

/* Look for any good interfaces */

2268

ret = scandir(sys_class_net, &direntries, good_interface,

2269

alphasort);

2270

if(ret >= 1){

2271

/* Add all found interfaces to interfaces list */

2272

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

2273

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

2274

direntries[i]->d_name);

2275

if(ret_errno != 0){

2276

errno = ret_errno;

2277

perror_plus("argz_add");

2278

continue;

2279

}

2280

if(debug){

2281

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

2282

direntries[i]->d_name);

2283

}

2284

}

2285

free(direntries);

2286

} else {

2287

if(ret == 0){

2288

free(direntries);

2289

}

2290

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

2291

exitcode = EXIT_FAILURE;

2292

goto end;

2293

}

2294

}

2295

2296

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

2297

{

2298

char *interface = NULL;

2299

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

2300

interface))){

2301

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

2302

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

2303

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

2304

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

2305

interface);

2306

interface = NULL;

2307

while((interface = argz_next(mc.interfaces,

2308

mc.interfaces_size, interface))){

2309

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

2310

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

2311

interface);

2312

interface = NULL;

1976

2313

}

1977

2314

}

1978

#endif /* __linux__ */

1979

/* Lower privileges */

1980

errno = 0;

1981

ret = seteuid(uid);

1982

if(ret == -1){

1983

perror_plus("seteuid");

1984

}

1985

goto end;

1986

}

1987

}

1988

/* Sleep checking until interface is running.

1989

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

1990

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

1991

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

1992

if(ret == -1){

1993

perror_plus("ioctl SIOCGIFFLAGS");

1994

} else if(network.ifr_flags & IFF_RUNNING){

1995

2315

break;

1996

2316

}

1997

struct timespec sleeptime = { .tv_nsec = 250000000 };

1998

ret = nanosleep(&sleeptime, NULL);

1999

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

2000

perror_plus("nanosleep");

2001

}

2002

}

2003

if(not take_down_interface){

2004

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

2005

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

2006

if(ret == -1){

2007

perror_plus("close");

2008

}

2009

}

2010

#ifdef __linux__

2011

if(restore_loglevel){

2012

/* Restores kernel loglevel to default */

2013

ret = klogctl(7, NULL, 0);

2014

if(ret == -1){

2015

perror_plus("klogctl");

2016

}

2017

}

2018

#endif /* __linux__ */

2019

/* Lower privileges */

2020

errno = 0;

2021

/* Lower privileges */

2022

ret = seteuid(uid);

2023

if(ret == -1){

2024

perror_plus("seteuid");

2025

}

2317

bool interface_was_up = interface_is_up(interface);

2318

errno = bring_up_interface(interface, delay);

2319

if(not interface_was_up){

2320

if(errno != 0){

2321

perror_plus("Failed to bring up interface");

2322

} else {

2323

errno = argz_add(&interfaces_to_take_down,

2324

&interfaces_to_take_down_size,

2325

interface);

2326

if(errno != 0){

2327

perror_plus("argz_add");

2328

}

2329

}

2330

}

2331

}

2332

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

2333

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

2334

}

2335

}

2336

2337

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

2338

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

2339

if(debug){

2340

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

2341

mc.interfaces);

2342

}

2343

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

2026

2344

}

2027

2345

2028

2346

if(quit_now){

2029

2347

goto end;

2030

2348

}

2031

2349

2032

ret = init_gnutls_global(pubkey, seckey);

2350

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

2033

2351

if(ret == -1){

2034

2352

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

2035

2353

exitcode = EX_UNAVAILABLE;

2042

2360

goto end;

2043

2361

}

2044

2362

2045

if(mkdtemp(tempdir) == NULL){

2363

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

2364

tempdir = mkdtemp(run_tempdir);

2365

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

2366

if(debug){

2367

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

2368

run_tempdir, old_tempdir);

2369

}

2370

tempdir = mkdtemp(old_tempdir);

2371

}

2372

if(tempdir == NULL){

2046

2373

perror_plus("mkdtemp");

2047

2374

goto end;

2048

2375

}

2049

tempdir_created = true;

2050

2376

2051

2377

if(quit_now){

2052

2378

goto end;

2053

2379

}

2054

2380

2055

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

2381

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

2056

2382

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

2057

2383

exitcode = EX_UNAVAILABLE;

2058

2384

goto end;

2068

2394

/* Connect directly, do not use Zeroconf */

2069

2395

/* (Mainly meant for debugging) */

2070

2396

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

2397

2071

2398

if(address == NULL){

2072

2399

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

2073

2400

exitcode = EX_USAGE;

2078

2405

goto end;

2079

2406

}

2080

2407

2081

uint16_t port;

2408

in_port_t port;

2082

2409

errno = 0;

2083

2410

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

2084

2411

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

2085

or tmpmax != (uint16_t)tmpmax){

2412

or tmpmax != (in_port_t)tmpmax){

2086

2413

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

2087

2414

exitcode = EX_USAGE;

2088

2415

goto end;

2089

2416

}

2090

2417

2091

2418

if(quit_now){

2092

2419

goto end;

2093

2420

}

2094

2421

2095

port = (uint16_t)tmpmax;

2422

port = (in_port_t)tmpmax;

2096

2423

*address = '\0';

2097

2424

/* Colon in address indicates IPv6 */

2098

2425

int af;

2114

2441

}

2115

2442

2116

2443

while(not quit_now){

2117

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

2444

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

2445

&mc);

2118

2446

if(quit_now or ret == 0){

2119

2447

break;

2120

2448

}

2122

2450

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

2123

2451

(int)retry_interval);

2124

2452

}

2125

sleep((int)retry_interval);

2453

sleep((unsigned int)retry_interval);

2126

2454

}

2127

2455

2128

if (not quit_now){

2456

if(not quit_now){

2129

2457

exitcode = EXIT_SUCCESS;

2130

2458

}

2131

2459

2146

2474

config.publish_domain = 0;

2147

2475

2148

2476

/* Allocate a new server */

2149

mc.server = avahi_server_new(avahi_simple_poll_get

2150

(mc.simple_poll), &config, NULL,

2151

NULL, &error);

2477

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2478

&config, NULL, NULL, &ret_errno);

2152

2479

2153

2480

/* Free the Avahi configuration data */

2154

2481

avahi_server_config_free(&config);

2157

2484

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

2158

2485

if(mc.server == NULL){

2159

2486

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

2160

avahi_strerror(error));

2487

avahi_strerror(ret_errno));

2161

2488

exitcode = EX_UNAVAILABLE;

2162

2489

goto end;

2163

2490

}

2169

2496

/* Create the Avahi service browser */

2170

2497

sb = avahi_s_service_browser_new(mc.server, if_index,

2171

2498

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2172

NULL, 0, browse_callback, NULL);

2499

NULL, 0, browse_callback,

2500

(void *)&mc);

2173

2501

if(sb == NULL){

2174

2502

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

2175

2503

avahi_strerror(avahi_server_errno(mc.server)));

2186

2514

if(debug){

2187

2515

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

2188

2516

}

2189

2190

ret = avahi_loop_with_timeout(mc.simple_poll,

2191

(int)(retry_interval * 1000));

2517

2518

ret = avahi_loop_with_timeout(simple_poll,

2519

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

2192

2520

if(debug){

2193

2521

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

2194

2522

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

2201

2529

}

2202

2530

2203

2531

/* Cleanup things */

2532

free(mc.interfaces);

2533

2204

2534

if(sb != NULL)

2205

2535

avahi_s_service_browser_free(sb);

2206

2536

2207

2537

if(mc.server != NULL)

2208

2538

avahi_server_free(mc.server);

2209

2539

2210

if(mc.simple_poll != NULL)

2211

avahi_simple_poll_free(mc.simple_poll);

2540

if(simple_poll != NULL)

2541

avahi_simple_poll_free(simple_poll);

2212

2542

2213

2543

if(gnutls_initialized){

2214

2544

gnutls_certificate_free_credentials(mc.cred);

2226

2556

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

2227

2557

while(mc.current_server != NULL){

2228

2558

server *next = mc.current_server->next;

2559

#ifdef __GNUC__

2560

#pragma GCC diagnostic push

2561

#pragma GCC diagnostic ignored "-Wcast-qual"

2562

#endif

2563

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

2564

#ifdef __GNUC__

2565

#pragma GCC diagnostic pop

2566

#endif

2229

2567

free(mc.current_server);

2230

2568

mc.current_server = next;

2231

2569

}

2232

2570

}

2233

2571

2234

/* Run network hooks */

2235

run_network_hooks("stop", interface, delay);

2236

2237

/* Re-raise priviliges */

2572

/* Re-raise privileges */

2238

2573

{

2239

errno = 0;

2240

ret = seteuid(0);

2241

if(ret == -1){

2242

perror_plus("seteuid");

2574

ret_errno = raise_privileges();

2575

if(ret_errno != 0){

2576

errno = ret_errno;

2577

perror_plus("Failed to raise privileges");

2578

} else {

2579

2580

/* Run network hooks */

2581

run_network_hooks("stop", interfaces_hooks != NULL ?

2582

interfaces_hooks : "", delay);

2583

2584

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

2585

{

2586

char *interface = NULL;

2587

while((interface=argz_next(interfaces_to_take_down,

2588

interfaces_to_take_down_size,

2589

interface))){

2590

ret_errno = take_down_interface(interface);

2591

if(ret_errno != 0){

2592

errno = ret_errno;

2593

perror_plus("Failed to take down interface");

2594

}

2595

}

2596

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

2597

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

2598

" down\n");

2599

}

2600

}

2243

2601

}

2244

2602

2245

/* Take down the network interface */

2246

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

2247

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

2248

if(ret == -1){

2249

perror_plus("ioctl SIOCGIFFLAGS");

2250

} else if(network.ifr_flags & IFF_UP){

2251

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

2252

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

2253

if(ret == -1){

2254

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2255

}

2256

}

2257

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

2258

if(ret == -1){

2259

perror_plus("close");

2260

}

2603

ret_errno = lower_privileges_permanently();

2604

if(ret_errno != 0){

2605

errno = ret_errno;

2606

perror_plus("Failed to lower privileges permanently");

2261

2607

}

2262

2608

}

2263

/* Lower privileges permanently */

2264

errno = 0;

2265

ret = setuid(uid);

2266

if(ret == -1){

2267

perror_plus("setuid");

2268

}

2609

2610

free(interfaces_to_take_down);

2611

free(interfaces_hooks);

2269

2612

2270

2613

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

2271

if(tempdir_created){

2614

if(tempdir != NULL){

2272

2615

struct dirent **direntries = NULL;

2273

struct dirent *direntry = NULL;

2274

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

2275

alphasort);

2276

if (numentries > 0){

2277

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

2278

direntry = direntries[i];

2279

char *fullname = NULL;

2280

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

2281

direntry->d_name);

2282

if(ret < 0){

2283

perror_plus("asprintf");

2284

continue;

2285

}

2286

ret = remove(fullname);

2287

if(ret == -1){

2288

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

2289

strerror(errno));

2290

}

2291

free(fullname);

2616

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

2617

O_NOFOLLOW));

2618

if(tempdir_fd == -1){

2619

perror_plus("open");

2620

} else {

2621

#ifdef __GLIBC__

2622

#if __GLIBC_PREREQ(2, 15)

2623

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

2624

notdotentries, alphasort);

2625

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

2626

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

2627

alphasort);

2628

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

2629

#else /* not __GLIBC__ */

2630

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

2631

alphasort);

2632

#endif /* not __GLIBC__ */

2633

if(numentries >= 0){

2634

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

2635

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

2636

if(ret == -1){

2637

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

2638

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

2639

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

2640

}

2641

}

2642

2643

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

2644

free(direntries);

2645

if(numentries == -1){

2646

perror_plus("scandir");

2647

}

2648

ret = rmdir(tempdir);

2649

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

2650

perror_plus("rmdir");

2651

}

2292

2652

}

2293

}

2294

2295

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

2296

free(direntries);

2297

if (numentries == -1){

2298

perror_plus("scandir");

2299

}

2300

ret = rmdir(tempdir);

2301

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

2302

perror_plus("rmdir");

2653

TEMP_FAILURE_RETRY(close(tempdir_fd));

2303

2654

}

2304

2655

}

2305

2656