/mandos/trunk : revision 594.1.1

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 /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

41

42

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

43

stdout, ferror() */

43

stdout, ferror(), remove() */

44

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

45

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

46

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

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

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inet_pton(), connect() */

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

61

60

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

62

61

*/

63

62

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

64

63

strtoimax() */

64

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

65

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

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program_invocation_short_name */

67

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

73

*/

74

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

75

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

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

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unlinkat() */

78

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

76

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

77

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

79

78

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

80

79

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

81

80

argp_state, struct argp,

89

88

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

90

89

WEXITSTATUS(), WTERMSIG() */

91

90

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

92

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

93

argz_delete(), argz_append(),

94

argz_stringify(), argz_add(),

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

98

91

99

92

#ifdef __linux__

100

93

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

142

135

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

143

136

char *connect_to = NULL;

144

137

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

138

uid_t uid = 65534;

147

139

gid_t gid = 65534;

148

140

149

141

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

150

142

typedef struct server{

151

143

const char *ip;

152

in_port_t port;

144

uint16_t port;

153

145

AvahiIfIndex if_index;

154

146

int af;

155

147

struct timespec last_seen;

159

151

160

152

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

161

153

typedef struct {

154

AvahiSimplePoll *simple_poll;

162

155

AvahiServer *server;

163

156

gnutls_certificate_credentials_t cred;

164

157

unsigned int dh_bits;

166

159

const char *priority;

167

160

gpgme_ctx_t ctx;

168

161

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

162

} mandos_context;

172

163

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

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 };

175

169

176

170

sig_atomic_t quit_now = 0;

177

171

int signal_received = 0;

185

179

perror(print_text);

186

180

}

187

181

188

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

182

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

189

183

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

190

184

va_list ap;

191

185

va_start (ap, format);

192

186

193

187

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

194

188

program_invocation_short_name));

195

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

189

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

196

190

}

197

191

198

192

/*

200

194

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

201

195

* "buffer_length" is how much is already used.

202

196

*/

203

__attribute__((nonnull, warn_unused_result))

204

197

size_t incbuffer(char **buffer, size_t buffer_length,

205

198

size_t buffer_capacity){

206

199

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

200

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

201

if(buffer == NULL){

213

202

return 0;

214

203

}

215

*buffer = new_buf;

216

204

buffer_capacity += BUFFER_SIZE;

217

205

}

218

206

return buffer_capacity;

219

207

}

220

208

221

209

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

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

210

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

211

int af){

225

212

int ret;

226

213

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

227

214

if(new_server == NULL){

234

221

.af = af };

235

222

if(new_server->ip == NULL){

236

223

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

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

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

224

return false;

253

225

}

254

226

/* Special case of first server */

255

if(*current_server == NULL){

227

if (mc.current_server == NULL){

256

228

new_server->next = new_server;

257

229

new_server->prev = new_server;

258

*current_server = new_server;

230

mc.current_server = new_server;

231

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

259

232

} else {

260

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

261

new_server->next = *current_server;

262

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

233

new_server->next = mc.current_server;

234

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

263

235

new_server->prev->next = new_server;

264

(*current_server)->prev = 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;

265

242

}

266

243

return true;

267

244

}

269

246

/*

270

247

* Initialize GPGME.

271

248

*/

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

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

250

const char *tempdir){

277

251

gpgme_error_t rc;

278

252

gpgme_engine_info_t engine_info;

279

253

254

280

255

/*

281

256

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

282

257

*/

283

bool import_key(const char * const filename){

258

bool import_key(const char *filename){

284

259

int ret;

285

260

int fd;

286

261

gpgme_data_t pgp_data;

298

273

return false;

299

274

}

300

275

301

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

276

rc = gpgme_op_import(mc.ctx, pgp_data);

302

277

if(rc != GPG_ERR_NO_ERROR){

303

278

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

304

279

gpgme_strsource(rc), gpgme_strerror(rc));

348

323

}

349

324

350

325

/* Create new GPGME "context" */

351

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

326

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

352

327

if(rc != GPG_ERR_NO_ERROR){

353

328

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

354

329

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

367

342

* Decrypt OpenPGP data.

368

343

* Returns -1 on error

369

344

*/

370

__attribute__((nonnull, warn_unused_result))

371

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

346

size_t crypto_size,

373

char **plaintext,

374

mandos_context *mc){

347

char **plaintext){

375

348

gpgme_data_t dh_crypto, dh_plain;

376

349

gpgme_error_t rc;

377

350

ssize_t ret;

403

376

404

377

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

405

378

data buffer */

406

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

379

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

407

380

if(rc != GPG_ERR_NO_ERROR){

408

381

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

409

382

gpgme_strsource(rc), gpgme_strerror(rc));

410

383

plaintext_length = -1;

411

384

if(debug){

412

385

gpgme_decrypt_result_t result;

413

result = gpgme_op_decrypt_result(mc->ctx);

386

result = gpgme_op_decrypt_result(mc.ctx);

414

387

if(result == NULL){

415

388

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

416

389

} else {

493

466

return plaintext_length;

494

467

}

495

468

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

469

static const char * safer_gnutls_strerror(int value){

470

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

471

-Wunreachable-code */

499

472

if(ret == NULL)

500

473

ret = "(unknown)";

501

474

return ret;

502

475

}

503

476

504

477

/* GnuTLS log function callback */

505

__attribute__((nonnull))

506

478

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

507

479

const char* string){

508

480

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

509

481

}

510

482

511

__attribute__((nonnull, warn_unused_result))

512

483

static int init_gnutls_global(const char *pubkeyfilename,

513

const char *seckeyfilename,

514

mandos_context *mc){

484

const char *seckeyfilename){

515

485

int ret;

516

486

517

487

if(debug){

534

504

}

535

505

536

506

/* OpenPGP credentials */

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

538

508

if(ret != GNUTLS_E_SUCCESS){

539

509

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

540

510

safer_gnutls_strerror(ret));

550

520

}

551

521

552

522

ret = gnutls_certificate_set_openpgp_key_file

553

(mc->cred, pubkeyfilename, seckeyfilename,

523

(mc.cred, pubkeyfilename, seckeyfilename,

554

524

GNUTLS_OPENPGP_FMT_BASE64);

555

525

if(ret != GNUTLS_E_SUCCESS){

556

526

fprintf_plus(stderr,

562

532

}

563

533

564

534

/* GnuTLS server initialization */

565

ret = gnutls_dh_params_init(&mc->dh_params);

535

ret = gnutls_dh_params_init(&mc.dh_params);

566

536

if(ret != GNUTLS_E_SUCCESS){

567

537

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

568

538

" initialization: %s\n",

569

539

safer_gnutls_strerror(ret));

570

540

goto globalfail;

571

541

}

572

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

542

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

573

543

if(ret != GNUTLS_E_SUCCESS){

574

544

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

575

545

safer_gnutls_strerror(ret));

576

546

goto globalfail;

577

547

}

578

548

579

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

549

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

580

550

581

551

return 0;

582

552

583

553

globalfail:

584

554

585

gnutls_certificate_free_credentials(mc->cred);

555

gnutls_certificate_free_credentials(mc.cred);

586

556

gnutls_global_deinit();

587

gnutls_dh_params_deinit(mc->dh_params);

557

gnutls_dh_params_deinit(mc.dh_params);

588

558

return -1;

589

559

}

590

560

591

__attribute__((nonnull, warn_unused_result))

592

static int init_gnutls_session(gnutls_session_t *session,

593

mandos_context *mc){

561

static int init_gnutls_session(gnutls_session_t *session){

594

562

int ret;

595

563

/* GnuTLS session creation */

596

564

do {

608

576

{

609

577

const char *err;

610

578

do {

611

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

579

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

612

580

if(quit_now){

613

581

gnutls_deinit(*session);

614

582

return -1;

625

593

626

594

do {

627

595

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

628

mc->cred);

596

mc.cred);

629

597

if(quit_now){

630

598

gnutls_deinit(*session);

631

599

return -1;

641

609

/* ignore client certificate if any. */

642

610

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

643

611

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

645

613

646

614

return 0;

647

615

}

651

619

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

652

620

653

621

/* Called when a Mandos server is found */

654

__attribute__((nonnull, warn_unused_result))

655

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

622

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

656

623

AvahiIfIndex if_index,

657

int af, mandos_context *mc){

624

int af){

658

625

int ret, tcp_sd = -1;

659

626

ssize_t sret;

660

struct sockaddr_storage to;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

661

631

char *buffer = NULL;

662

632

char *decrypted_buffer = NULL;

663

633

size_t buffer_length = 0;

687

657

return -1;

688

658

}

689

659

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);

660

ret = init_gnutls_session(&session);

723

661

if(ret != 0){

724

662

return -1;

725

663

}

726

664

727

665

if(debug){

728

666

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

729

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

667

PRIu16 "\n", ip, port);

730

668

}

731

669

732

670

tcp_sd = socket(pf, SOCK_STREAM, 0);

744

682

745

683

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

746

684

if(af == AF_INET6){

747

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

748

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

685

to.in6.sin6_family = (sa_family_t)af;

686

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

749

687

} else { /* IPv4 */

750

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

751

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

688

to.in.sin_family = (sa_family_t)af;

689

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

752

690

}

753

691

if(ret < 0 ){

754

692

int e = errno;

763

701

goto mandos_end;

764

702

}

765

703

if(af == AF_INET6){

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

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*/

769

711

if(if_index == AVAHI_IF_UNSPEC){

770

712

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

771

713

" incomplete without a network interface\n");

773

715

goto mandos_end;

774

716

}

775

717

/* Set the network interface number as scope */

776

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

718

to.in6.sin6_scope_id = (uint32_t)if_index;

777

719

}

778

720

} else {

779

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

721

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

722

-Wconversion and

723

-Wunreachable-code */

780

724

}

781

725

782

726

if(quit_now){

790

734

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

791

735

perror_plus("if_indextoname");

792

736

} else {

793

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

794

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

737

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

738

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

795

739

}

796

740

} else {

797

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

798

ip, (uintmax_t)port);

741

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

742

ip, port);

799

743

}

800

744

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

801

745

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

746

const char *pcret;

802

747

if(af == AF_INET6){

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

748

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

749

sizeof(addrstr));

807

750

} else {

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

751

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

752

sizeof(addrstr));

812

753

}

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);

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

}

819

760

}

820

761

}

821

762

825

766

}

826

767

827

768

if(af == AF_INET6){

828

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

829

sizeof(struct sockaddr_in6));

769

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

830

770

} else {

831

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

832

sizeof(struct sockaddr_in));

771

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

833

772

}

834

773

if(ret < 0){

835

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

774

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

836

775

int e = errno;

837

776

perror_plus("connect");

838

777

errno = e;

999

938

if(buffer_length > 0){

1000

939

ssize_t decrypted_buffer_size;

1001

940

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1002

&decrypted_buffer, mc);

941

&decrypted_buffer);

1003

942

if(decrypted_buffer_size >= 0){

1004

943

1005

944

written = 0;

1053

992

return retval;

1054

993

}

1055

994

1056

__attribute__((nonnull))

1057

995

static void resolve_callback(AvahiSServiceResolver *r,

1058

996

AvahiIfIndex interface,

1059

997

AvahiProtocol proto,

1067

1005

AVAHI_GCC_UNUSED AvahiStringList *txt,

1068

1006

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1069

1007

flags,

1070

void *mc){

1071

if(r == NULL){

1072

return;

1073

}

1008

AVAHI_GCC_UNUSED void* userdata){

1009

assert(r);

1074

1010

1075

1011

/* Called whenever a service has been resolved successfully or

1076

1012

timed out */

1077

1013

1078

1014

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1080

1015

return;

1081

1016

}

1082

1017

1086

1021

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

1087

1022

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

1088

1023

domain,

1089

avahi_strerror(avahi_server_errno

1090

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

1024

avahi_strerror(avahi_server_errno(mc.server)));

1091

1025

break;

1092

1026

1093

1027

case AVAHI_RESOLVER_FOUND:

1099

1033

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

1100

1034

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

1101

1035

}

1102

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

1103

interface,

1104

avahi_proto_to_af(proto),

1105

mc);

1036

int ret = start_mandos_communication(ip, port, interface,

1037

avahi_proto_to_af(proto));

1106

1038

if(ret == 0){

1107

avahi_simple_poll_quit(simple_poll);

1039

avahi_simple_poll_quit(mc.simple_poll);

1108

1040

} else {

1109

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

1110

avahi_proto_to_af(proto),

1111

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

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1112

1043

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

1113

1044

" list\n", name);

1114

1045

}

1127

1058

const char *domain,

1128

1059

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1129

1060

flags,

1130

void *mc){

1131

if(b == NULL){

1132

return;

1133

}

1061

AVAHI_GCC_UNUSED void* userdata){

1062

assert(b);

1134

1063

1135

1064

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

1136

1065

is removed from the LAN */

1144

1073

case AVAHI_BROWSER_FAILURE:

1145

1074

1146

1075

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

1147

avahi_strerror(avahi_server_errno

1148

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

1149

avahi_simple_poll_quit(simple_poll);

1076

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_simple_poll_quit(mc.simple_poll);

1150

1078

return;

1151

1079

1152

1080

case AVAHI_BROWSER_NEW:

1155

1083

the callback function is called the Avahi server will free the

1156

1084

resolver for us. */

1157

1085

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)

1086

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

1087

name, type, domain, protocol, 0,

1088

resolve_callback, NULL) == NULL)

1162

1089

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

1163

1090

" %s\n", name,

1164

avahi_strerror(avahi_server_errno

1165

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

1091

avahi_strerror(avahi_server_errno(mc.server)));

1166

1092

break;

1167

1093

1168

1094

case AVAHI_BROWSER_REMOVE:

1187

1113

signal_received = sig;

1188

1114

int old_errno = errno;

1189

1115

/* set main loop to exit */

1190

if(simple_poll != NULL){

1191

avahi_simple_poll_quit(simple_poll);

1116

if(mc.simple_poll != NULL){

1117

avahi_simple_poll_quit(mc.simple_poll);

1192

1118

}

1193

1119

errno = old_errno;

1194

1120

}

1195

1121

1196

__attribute__((nonnull, warn_unused_result))

1197

1122

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

1198

1123

int ret;

1199

error_t ret_errno;

1200

1124

1201

1125

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

1202

1126

if(s < 0){

1203

ret_errno = errno;

1204

1127

perror_plus("socket");

1205

errno = ret_errno;

1206

1128

return false;

1207

1129

}

1208

1130

strcpy(ifr->ifr_name, ifname);

1209

1131

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1210

1132

if(ret == -1){

1211

1133

if(debug){

1212

ret_errno = errno;

1213

1134

perror_plus("ioctl SIOCGIFFLAGS");

1214

errno = ret_errno;

1215

1135

}

1216

1136

return false;

1217

1137

}

1218

1138

return true;

1219

1139

}

1220

1140

1221

__attribute__((nonnull, warn_unused_result))

1222

1141

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

1223

1142

1224

1143

/* Reject the loopback device */

1266

1185

* corresponds to an acceptable network device.

1267

1186

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

1268

1187

*/

1269

__attribute__((nonnull, warn_unused_result))

1270

1188

int good_interface(const struct dirent *if_entry){

1271

1189

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

1272

1190

return 0;

1288

1206

}

1289

1207

1290

1208

/*

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))

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

1325

1251

int notdotentries(const struct dirent *direntry){

1326

1252

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

1327

1253

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

1334

1260

}

1335

1261

1336

1262

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

1337

__attribute__((nonnull, warn_unused_result))

1338

1263

int runnable_hook(const struct dirent *direntry){

1339

1264

int ret;

1340

1265

size_t sret;

1348

1273

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

1349

1274

"abcdefghijklmnopqrstuvwxyz"

1350

1275

"0123456789"

1351

"_.-");

1276

"_-");

1352

1277

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

1353

1278

/* Contains non-allowed characters */

1354

1279

if(debug){

1358

1283

return 0;

1359

1284

}

1360

1285

1361

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

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);

1362

1294

if(ret == -1){

1363

1295

if(debug){

1364

1296

perror_plus("Could not stat hook");

1388

1320

return 1;

1389

1321

}

1390

1322

1391

__attribute__((nonnull, warn_unused_result))

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

mandos_context *mc){

1323

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1394

1324

int ret;

1395

1325

struct timespec now;

1396

1326

struct timespec waited_time;

1397

1327

intmax_t block_time;

1398

1328

1399

1329

while(true){

1400

if(mc->current_server == NULL){

1401

if(debug){

1330

if(mc.current_server == NULL){

1331

if (debug){

1402

1332

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

1403

1333

" No timeout!\n");

1404

1334

}

1405

1335

ret = avahi_simple_poll_iterate(s, -1);

1406

1336

} else {

1407

if(debug){

1337

if (debug){

1408

1338

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

1409

1339

" it, or wait\n");

1410

1340

}

1417

1347

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

1418

1348

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

1419

1349

waited_time.tv_sec = (now.tv_sec

1420

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

1350

- mc.current_server->last_seen.tv_sec);

1421

1351

waited_time.tv_nsec = (now.tv_nsec

1422

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

1352

- mc.current_server->last_seen.tv_nsec);

1423

1353

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

1424

1354

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

1425

1355

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

1427

1357

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

1428

1358

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

1429

1359

1430

if(debug){

1360

if (debug){

1431

1361

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

1432

1362

block_time);

1433

1363

}

1434

1364

1435

1365

if(block_time <= 0){

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);

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);

1440

1370

if(ret == 0){

1441

avahi_simple_poll_quit(s);

1371

avahi_simple_poll_quit(mc.simple_poll);

1442

1372

return 0;

1443

1373

}

1444

1374

ret = clock_gettime(CLOCK_MONOTONIC,

1445

&mc->current_server->last_seen);

1375

&mc.current_server->last_seen);

1446

1376

if(ret == -1){

1447

1377

perror_plus("clock_gettime");

1448

1378

return -1;

1449

1379

}

1450

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

1380

mc.current_server = mc.current_server->next;

1451

1381

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

1452

1382

servers, but don't block */

1453

1383

}

1455

1385

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

1456

1386

}

1457

1387

if(ret != 0){

1458

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

1388

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

1459

1389

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

1460

1390

}

1461

1391

}

1463

1393

}

1464

1394

1465

1395

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

1466

__attribute__((warn_unused_result))

1467

error_t raise_privileges(void){

1468

error_t old_errno = errno;

1469

error_t ret_errno = 0;

1396

int raise_privileges(void){

1397

int old_errno = errno;

1398

int ret_errno = 0;

1399

errno = 0;

1470

1400

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

1471

ret_errno = errno;

1401

perror_plus("seteuid");

1472

1402

}

1403

ret_errno = errno;

1473

1404

errno = old_errno;

1474

1405

return ret_errno;

1475

1406

}

1476

1407

1477

1408

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

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();

1409

int raise_privileges_permanently(void){

1410

int old_errno = errno;

1411

int ret_errno = raise_privileges();

1482

1412

if(ret_errno != 0){

1483

1413

errno = old_errno;

1484

1414

return ret_errno;

1485

1415

}

1416

errno = 0;

1486

1417

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

1487

ret_errno = errno;

1418

perror_plus("seteuid");

1488

1419

}

1420

ret_errno = errno;

1489

1421

errno = old_errno;

1490

1422

return ret_errno;

1491

1423

}

1492

1424

1493

1425

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

1494

__attribute__((warn_unused_result))

1495

error_t lower_privileges(void){

1496

error_t old_errno = errno;

1497

error_t ret_errno = 0;

1426

int lower_privileges(void){

1427

int old_errno = errno;

1428

int ret_errno = 0;

1429

errno = 0;

1498

1430

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

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,

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,

1519

1439

const float delay){

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__ */

1440

struct dirent **direntries;

1441

struct dirent *direntry;

1442

int ret;

1443

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

1444

alphasort);

1547

1445

if(numhooks == -1){

1548

1446

perror_plus("scandir");

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){

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){

1621

1454

perror_plus("asprintf");

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

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

}

1626

1513

free(delaystring);

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;

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

}

1673

1525

} else {

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);

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;

1693

1562

}

1694

1563

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;

1564

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

1565

int sd = -1;

1699

1566

int ret;

1700

1567

struct ifreq network;

1701

unsigned int if_index = if_nametoindex(interface);

1568

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1702

1569

if(if_index == 0){

1703

1570

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

1704

errno = old_errno;

1705

return ENXIO;

1571

return EX_UNAVAILABLE;

1706

1572

}

1707

1573

1708

1574

if(quit_now){

1709

errno = old_errno;

1710

1575

return EINTR;

1711

1576

}

1712

1577

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));

1578

/* Re-raise priviliges */

1579

raise_privileges();

1580

1581

#ifdef __linux__

1582

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1583

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

1584

ret = klogctl(8, NULL, 5);

1585

bool restore_loglevel = true;

1586

if(ret == -1){

1587

restore_loglevel = false;

1588

perror_plus("klogctl");

1589

}

1590

#endif /* __linux__ */

1591

1592

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1593

if(sd < 0){

1594

perror_plus("socket");

1595

#ifdef __linux__

1596

if(restore_loglevel){

1597

ret = klogctl(7, NULL, 0);

1598

if(ret == -1){

1599

perror_plus("klogctl");

1600

}

1601

}

1602

#endif /* __linux__ */

1603

/* Lower privileges */

1604

lower_privileges();

1605

return EX_OSERR;

1606

;

1607

}

1608

strcpy(network.ifr_name, interface);

1609

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

1610

if(ret == -1){

1611

perror_plus("ioctl SIOCGIFFLAGS");

1612

#ifdef __linux__

1613

if(restore_loglevel){

1614

ret = klogctl(7, NULL, 0);

1615

if(ret == -1){

1616

perror_plus("klogctl");

1617

}

1618

}

1619

#endif /* __linux__ */

1620

/* Lower privileges */

1621

lower_privileges();

1622

return EX_OSERR;

1623

}

1624

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

1625

network.ifr_flags |= IFF_UP;

1626

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

1790

1627

if(ret == -1){

1791

perror_plus("close");

1792

}

1793

1794

if(ret_setflags == -1){

1795

errno = ioctl_errno;

1796

1628

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1797

errno = old_errno;

1798

return ioctl_errno;

1629

#ifdef __linux__

1630

if(restore_loglevel){

1631

ret = klogctl(7, NULL, 0);

1632

if(ret == -1){

1633

perror_plus("klogctl");

1634

}

1635

}

1636

#endif /* __linux__ */

1637

/* Lower privileges */

1638

lower_privileges();

1639

return EX_OSERR;

1799

1640

}

1800

} else if(debug){

1801

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

1802

interface);

1803

1641

}

1804

1805

1642

/* Sleep checking until interface is running.

1806

1643

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

1807

1644

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

1808

if(interface_is_running(interface)){

1645

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

1646

if(ret == -1){

1647

perror_plus("ioctl SIOCGIFFLAGS");

1648

} else if(network.ifr_flags & IFF_RUNNING){

1809

1649

break;

1810

1650

}

1811

1651

struct timespec sleeptime = { .tv_nsec = 250000000 };

1814

1654

perror_plus("nanosleep");

1815

1655

}

1816

1656

}

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;

1657

/* Close the socket */

1658

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

1659

if(ret == -1){

1660

perror_plus("close");

1831

1661

}

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));

1662

#ifdef __linux__

1663

if(restore_loglevel){

1664

/* Restores kernel loglevel to default */

1665

ret = klogctl(7, NULL, 0);

1878

1666

if(ret == -1){

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);

1667

perror_plus("klogctl");

1668

}

1891

1669

}

1892

1893

errno = old_errno;

1894

return 0;

1670

#endif /* __linux__ */

1671

/* Lower privileges */

1672

lower_privileges();

1673

return errno;

1895

1674

}

1896

1675

1897

1676

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 };

1902

1677

AvahiSServiceBrowser *sb = NULL;

1903

error_t ret_errno;

1678

int error;

1904

1679

int ret;

1905

1680

intmax_t tmpmax;

1906

1681

char *tmp;

1907

1682

int exitcode = EXIT_SUCCESS;

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;

1683

const char *interface = "";

1684

struct ifreq network;

1685

int sd = -1;

1686

bool take_down_interface = false;

1687

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

1688

bool tempdir_created = false;

1913

1689

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1914

1690

const char *seckey = PATHDIR "/" SECKEY;

1915

1691

const char *pubkey = PATHDIR "/" PUBKEY;

1916

char *interfaces_hooks = NULL;

1917

1692

1918

1693

bool gnutls_initialized = false;

1919

1694

bool gpgme_initialized = false;

2010

1785

connect_to = arg;

2011

1786

break;

2012

1787

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

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

}

1788

interface = arg;

2018

1789

break;

2019

1790

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

2020

1791

seckey = arg;

2097

1868

/* Work around Debian bug #633582:

2098

1869

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

2099

1870

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 {

1871

/* Re-raise priviliges */

1872

if(raise_privileges() == 0){

2106

1873

struct stat st;

2107

1874

2108

1875

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

2148

1915

}

2149

1916

2150

1917

/* Lower privileges */

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;

1918

errno = 0;

1919

ret = seteuid(uid);

1920

if(ret == -1){

1921

perror_plus("seteuid");

2172

1922

}

2173

1923

}

2174

1924

}

2175

1925

2176

1926

/* Run network hooks */

2177

{

2178

if(mc.interfaces != NULL){

2179

interfaces_hooks = malloc(mc.interfaces_size);

2180

if(interfaces_hooks == NULL){

1927

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

1928

goto end;

1929

}

1930

1931

if(not debug){

1932

avahi_set_log_function(empty_log);

1933

}

1934

1935

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

1936

struct dirent **direntries;

1937

/* First look for interfaces that are up */

1938

ret = scandir(sys_class_net, &direntries, up_interface,

1939

alphasort);

1940

if(ret == 0){

1941

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

1942

free(direntries);

1943

ret = scandir(sys_class_net, &direntries, good_interface,

1944

alphasort);

1945

}

1946

if(ret >= 1){

1947

/* Pick the first interface returned */

1948

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

1949

if(debug){

1950

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

1951

}

1952

if(interface == NULL){

2181

1953

perror_plus("malloc");

1954

free(direntries);

1955

exitcode = EXIT_FAILURE;

2182

1956

goto end;

2183

1957

}

2184

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

2185

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

1958

free(direntries);

1959

} else {

1960

free(direntries);

1961

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

1962

exitcode = EXIT_FAILURE;

1963

goto end;

2186

1964

}

2187

run_network_hooks("start", interfaces_hooks != NULL ?

2188

interfaces_hooks : "", delay);

2189

}

2190

2191

if(not debug){

2192

avahi_set_log_function(empty_log);

2193

1965

}

2194

1966

2195

1967

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

2196

1968

from the signal handler */

2197

1969

/* Initialize the pseudo-RNG for Avahi */

2198

1970

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

2199

simple_poll = avahi_simple_poll_new();

2200

if(simple_poll == NULL){

1971

mc.simple_poll = avahi_simple_poll_new();

1972

if(mc.simple_poll == NULL){

2201

1973

fprintf_plus(stderr,

2202

1974

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

2203

1975

exitcode = EX_UNAVAILABLE;

2267

2039

}

2268

2040

}

2269

2041

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);

2042

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

2043

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

2044

ret = bring_up_interface(interface, delay);

2045

if(ret){

2046

errno = ret;

2047

perror_plus("Failed to bring up interface");

2048

}

2352

2049

}

2353

2050

2354

2051

if(quit_now){

2355

2052

goto end;

2356

2053

}

2357

2054

2358

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

2055

ret = init_gnutls_global(pubkey, seckey);

2359

2056

if(ret == -1){

2360

2057

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

2361

2058

exitcode = EX_UNAVAILABLE;

2368

2065

goto end;

2369

2066

}

2370

2067

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){

2068

if(mkdtemp(tempdir) == NULL){

2381

2069

perror_plus("mkdtemp");

2382

2070

goto end;

2383

2071

}

2072

tempdir_created = true;

2384

2073

2385

2074

if(quit_now){

2386

2075

goto end;

2387

2076

}

2388

2077

2389

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

2078

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

2390

2079

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

2391

2080

exitcode = EX_UNAVAILABLE;

2392

2081

goto end;

2413

2102

goto end;

2414

2103

}

2415

2104

2416

in_port_t port;

2105

uint16_t port;

2417

2106

errno = 0;

2418

2107

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

2419

2108

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

2420

or tmpmax != (in_port_t)tmpmax){

2109

or tmpmax != (uint16_t)tmpmax){

2421

2110

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

2422

2111

exitcode = EX_USAGE;

2423

2112

goto end;

2424

2113

}

2425

2114

2426

2115

if(quit_now){

2427

2116

goto end;

2428

2117

}

2429

2118

2430

port = (in_port_t)tmpmax;

2119

port = (uint16_t)tmpmax;

2431

2120

*address = '\0';

2432

2121

/* Colon in address indicates IPv6 */

2433

2122

int af;

2449

2138

}

2450

2139

2451

2140

while(not quit_now){

2452

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

2453

&mc);

2141

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

2454

2142

if(quit_now or ret == 0){

2455

2143

break;

2456

2144

}

2458

2146

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

2459

2147

(int)retry_interval);

2460

2148

}

2461

sleep((unsigned int)retry_interval);

2149

sleep((int)retry_interval);

2462

2150

}

2463

2151

2464

if(not quit_now){

2152

if (not quit_now){

2465

2153

exitcode = EXIT_SUCCESS;

2466

2154

}

2467

2155

2482

2170

config.publish_domain = 0;

2483

2171

2484

2172

/* Allocate a new server */

2485

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2486

&config, NULL, NULL, &ret_errno);

2173

mc.server = avahi_server_new(avahi_simple_poll_get

2174

(mc.simple_poll), &config, NULL,

2175

NULL, &error);

2487

2176

2488

2177

/* Free the Avahi configuration data */

2489

2178

avahi_server_config_free(&config);

2492

2181

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

2493

2182

if(mc.server == NULL){

2494

2183

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

2495

avahi_strerror(ret_errno));

2184

avahi_strerror(error));

2496

2185

exitcode = EX_UNAVAILABLE;

2497

2186

goto end;

2498

2187

}

2504

2193

/* Create the Avahi service browser */

2505

2194

sb = avahi_s_service_browser_new(mc.server, if_index,

2506

2195

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2507

NULL, 0, browse_callback,

2508

(void *)&mc);

2196

NULL, 0, browse_callback, NULL);

2509

2197

if(sb == NULL){

2510

2198

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

2511

2199

avahi_strerror(avahi_server_errno(mc.server)));

2522

2210

if(debug){

2523

2211

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

2524

2212

}

2525

2526

ret = avahi_loop_with_timeout(simple_poll,

2527

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

2213

2214

ret = avahi_loop_with_timeout(mc.simple_poll,

2215

(int)(retry_interval * 1000));

2528

2216

if(debug){

2529

2217

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

2530

2218

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

2537

2225

}

2538

2226

2539

2227

/* Cleanup things */

2540

free(mc.interfaces);

2541

2542

2228

if(sb != NULL)

2543

2229

avahi_s_service_browser_free(sb);

2544

2230

2545

2231

if(mc.server != NULL)

2546

2232

avahi_server_free(mc.server);

2547

2233

2548

if(simple_poll != NULL)

2549

avahi_simple_poll_free(simple_poll);

2234

if(mc.simple_poll != NULL)

2235

avahi_simple_poll_free(mc.simple_poll);

2550

2236

2551

2237

if(gnutls_initialized){

2552

2238

gnutls_certificate_free_credentials(mc.cred);

2564

2250

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

2565

2251

while(mc.current_server != NULL){

2566

2252

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

2575

2253

free(mc.current_server);

2576

2254

mc.current_server = next;

2577

2255

}

2578

2256

}

2579

2257

2580

/* Re-raise privileges */

2258

/* Run network hooks */

2259

run_network_hooks("stop", interface, delay);

2260

2261

/* Re-raise priviliges */

2581

2262

{

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

}

2263

raise_privileges();

2610

2264

2611

ret_errno = lower_privileges_permanently();

2612

if(ret_errno != 0){

2613

errno = ret_errno;

2614

perror_plus("Failed to lower privileges permanently");

2265

/* Take down the network interface */

2266

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

2267

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

2268

if(ret == -1){

2269

perror_plus("ioctl SIOCGIFFLAGS");

2270

} else if(network.ifr_flags & IFF_UP){

2271

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

2272

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

2273

if(ret == -1){

2274

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2275

}

2276

}

2277

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

2278

if(ret == -1){

2279

perror_plus("close");

2280

}

2615

2281

}

2616

2282

}

2617

2618

free(interfaces_to_take_down);

2619

free(interfaces_hooks);

2283

/* Lower privileges permanently */

2284

errno = 0;

2285

ret = setuid(uid);

2286

if(ret == -1){

2287

perror_plus("setuid");

2288

}

2620

2289

2621

2290

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

2622

if(tempdir != NULL){

2291

if(tempdir_created){

2623

2292

struct dirent **direntries = NULL;

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

}

2293

struct dirent *direntry = NULL;

2294

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

2295

alphasort);

2296

if (numentries > 0){

2297

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

2298

direntry = direntries[i];

2299

char *fullname = NULL;

2300

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

2301

direntry->d_name);

2302

if(ret < 0){

2303

perror_plus("asprintf");

2304

continue;

2305

}

2306

ret = remove(fullname);

2307

if(ret == -1){

2308

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

2309

strerror(errno));

2310

}

2311

free(fullname);

2661

2312

}

2662

TEMP_FAILURE_RETRY(close(tempdir_fd));

2313

}

2314

2315

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

2316

free(direntries);

2317

if (numentries == -1){

2318

perror_plus("scandir");

2319

}

2320

ret = rmdir(tempdir);

2321

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

2322

perror_plus("rmdir");

2663

2323

}

2664

2324

}

2665

2325