/mandos/trunk : revision 594.1.3

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* 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() */

58

inet_pton(), connect() */

59

#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(),

76

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){

236

223

perror_plus("strdup");

237

224

return false;

238

225

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

226

/* Special case of first server */

245

if(*current_server == NULL){

227

if (mc.current_server == NULL){

246

228

new_server->next = new_server;

247

229

new_server->prev = new_server;

248

*current_server = new_server;

230

mc.current_server = new_server;

231

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

249

232

} else {

250

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

251

new_server->next = *current_server;

252

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

233

new_server->next = mc.current_server;

234

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

253

235

new_server->prev->next = new_server;

254

(*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;

255

242

}

256

243

return true;

257

244

}

259

246

/*

260

247

* Initialize GPGME.

261

248

*/

262

__attribute__((nonnull, warn_unused_result))

263

static bool init_gpgme(const char * const seckey,

264

const char * const pubkey,

265

const char * const tempdir,

266

mandos_context *mc){

249

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

250

const char *tempdir){

267

251

gpgme_error_t rc;

268

252

gpgme_engine_info_t engine_info;

269

253

254

270

255

/*

271

256

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

272

257

*/

273

bool import_key(const char * const filename){

258

bool import_key(const char *filename){

274

259

int ret;

275

260

int fd;

276

261

gpgme_data_t pgp_data;

288

273

return false;

289

274

}

290

275

291

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

276

rc = gpgme_op_import(mc.ctx, pgp_data);

292

277

if(rc != GPG_ERR_NO_ERROR){

293

278

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

294

279

gpgme_strsource(rc), gpgme_strerror(rc));

338

323

}

339

324

340

325

/* Create new GPGME "context" */

341

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

326

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

342

327

if(rc != GPG_ERR_NO_ERROR){

343

328

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

344

329

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

357

342

* Decrypt OpenPGP data.

358

343

* Returns -1 on error

359

344

*/

360

__attribute__((nonnull, warn_unused_result))

361

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

362

346

size_t crypto_size,

363

char **plaintext,

364

mandos_context *mc){

347

char **plaintext){

365

348

gpgme_data_t dh_crypto, dh_plain;

366

349

gpgme_error_t rc;

367

350

ssize_t ret;

393

376

394

377

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

395

378

data buffer */

396

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

379

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

397

380

if(rc != GPG_ERR_NO_ERROR){

398

381

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

399

382

gpgme_strsource(rc), gpgme_strerror(rc));

400

383

plaintext_length = -1;

401

384

if(debug){

402

385

gpgme_decrypt_result_t result;

403

result = gpgme_op_decrypt_result(mc->ctx);

386

result = gpgme_op_decrypt_result(mc.ctx);

404

387

if(result == NULL){

405

388

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

406

389

} else {

483

466

return plaintext_length;

484

467

}

485

468

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

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 */

489

472

if(ret == NULL)

490

473

ret = "(unknown)";

491

474

return ret;

492

475

}

493

476

494

477

/* GnuTLS log function callback */

495

__attribute__((nonnull))

496

478

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

497

479

const char* string){

498

480

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

499

481

}

500

482

501

__attribute__((nonnull, warn_unused_result))

502

483

static int init_gnutls_global(const char *pubkeyfilename,

503

const char *seckeyfilename,

504

mandos_context *mc){

484

const char *seckeyfilename){

505

485

int ret;

506

486

507

487

if(debug){

524

504

}

525

505

526

506

/* OpenPGP credentials */

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

528

508

if(ret != GNUTLS_E_SUCCESS){

529

509

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

530

510

safer_gnutls_strerror(ret));

540

520

}

541

521

542

522

ret = gnutls_certificate_set_openpgp_key_file

543

(mc->cred, pubkeyfilename, seckeyfilename,

523

(mc.cred, pubkeyfilename, seckeyfilename,

544

524

GNUTLS_OPENPGP_FMT_BASE64);

545

525

if(ret != GNUTLS_E_SUCCESS){

546

526

fprintf_plus(stderr,

552

532

}

553

533

554

534

/* GnuTLS server initialization */

555

ret = gnutls_dh_params_init(&mc->dh_params);

535

ret = gnutls_dh_params_init(&mc.dh_params);

556

536

if(ret != GNUTLS_E_SUCCESS){

557

537

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

558

538

" initialization: %s\n",

559

539

safer_gnutls_strerror(ret));

560

540

goto globalfail;

561

541

}

562

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

542

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

563

543

if(ret != GNUTLS_E_SUCCESS){

564

544

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

565

545

safer_gnutls_strerror(ret));

566

546

goto globalfail;

567

547

}

568

548

569

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

549

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

570

550

571

551

return 0;

572

552

573

553

globalfail:

574

554

575

gnutls_certificate_free_credentials(mc->cred);

555

gnutls_certificate_free_credentials(mc.cred);

576

556

gnutls_global_deinit();

577

gnutls_dh_params_deinit(mc->dh_params);

557

gnutls_dh_params_deinit(mc.dh_params);

578

558

return -1;

579

559

}

580

560

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

561

static int init_gnutls_session(gnutls_session_t *session){

584

562

int ret;

585

563

/* GnuTLS session creation */

586

564

do {

598

576

{

599

577

const char *err;

600

578

do {

601

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

579

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

602

580

if(quit_now){

603

581

gnutls_deinit(*session);

604

582

return -1;

615

593

616

594

do {

617

595

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

618

mc->cred);

596

mc.cred);

619

597

if(quit_now){

620

598

gnutls_deinit(*session);

621

599

return -1;

631

609

/* ignore client certificate if any. */

632

610

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

633

611

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

635

613

636

614

return 0;

637

615

}

641

619

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

642

620

643

621

/* Called when a Mandos server is found */

644

__attribute__((nonnull, warn_unused_result))

645

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

622

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

646

623

AvahiIfIndex if_index,

647

int af, mandos_context *mc){

624

int af){

648

625

int ret, tcp_sd = -1;

649

626

ssize_t sret;

650

struct sockaddr_storage to;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

651

631

char *buffer = NULL;

652

632

char *decrypted_buffer = NULL;

653

633

size_t buffer_length = 0;

677

657

return -1;

678

658

}

679

659

680

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

681

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

682

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

683

bool match = false;

684

{

685

char *interface = NULL;

686

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

687

interface))){

688

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

689

match = true;

690

break;

691

}

692

}

693

}

694

if(not match){

695

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

696

connect to the server */

697

if(debug){

698

char interface[IF_NAMESIZE];

699

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

700

perror_plus("if_indextoname");

701

} else {

702

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

703

" \"%s\"\n",

704

if_indextoname((unsigned int)if_index,

705

interface));

706

}

707

}

708

return -1;

709

}

710

}

711

712

ret = init_gnutls_session(&session, mc);

660

ret = init_gnutls_session(&session);

713

661

if(ret != 0){

714

662

return -1;

715

663

}

716

664

717

665

if(debug){

718

666

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

719

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

667

PRIu16 "\n", ip, port);

720

668

}

721

669

722

670

tcp_sd = socket(pf, SOCK_STREAM, 0);

734

682

735

683

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

736

684

if(af == AF_INET6){

737

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

738

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);

739

687

} else { /* IPv4 */

740

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

741

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);

742

690

}

743

691

if(ret < 0 ){

744

692

int e = errno;

753

701

goto mandos_end;

754

702

}

755

703

if(af == AF_INET6){

756

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

757

if(IN6_IS_ADDR_LINKLOCAL

758

(&((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*/

759

711

if(if_index == AVAHI_IF_UNSPEC){

760

712

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

761

713

" incomplete without a network interface\n");

763

715

goto mandos_end;

764

716

}

765

717

/* Set the network interface number as scope */

766

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

718

to.in6.sin6_scope_id = (uint32_t)if_index;

767

719

}

768

720

} else {

769

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

721

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

722

-Wconversion and

723

-Wunreachable-code */

770

724

}

771

725

772

726

if(quit_now){

780

734

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

781

735

perror_plus("if_indextoname");

782

736

} else {

783

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

784

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

737

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

738

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

785

739

}

786

740

} else {

787

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

788

ip, (uintmax_t)port);

741

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

742

ip, port);

789

743

}

790

744

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

791

745

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

746

const char *pcret;

792

747

if(af == AF_INET6){

793

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

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

748

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

749

sizeof(addrstr));

797

750

} else {

798

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

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

751

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

752

sizeof(addrstr));

802

753

}

803

if(ret == EAI_SYSTEM){

804

perror_plus("getnameinfo");

805

} else if(ret != 0) {

806

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

807

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

808

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

}

809

760

}

810

761

}

811

762

815

766

}

816

767

817

768

if(af == AF_INET6){

818

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

819

sizeof(struct sockaddr_in6));

769

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

820

770

} else {

821

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

822

sizeof(struct sockaddr_in));

771

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

823

772

}

824

773

if(ret < 0){

825

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

774

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

826

775

int e = errno;

827

776

perror_plus("connect");

828

777

errno = e;

989

938

if(buffer_length > 0){

990

939

ssize_t decrypted_buffer_size;

991

940

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

992

&decrypted_buffer, mc);

941

&decrypted_buffer);

993

942

if(decrypted_buffer_size >= 0){

994

943

995

944

written = 0;

1043

992

return retval;

1044

993

}

1045

994

1046

__attribute__((nonnull))

1047

995

static void resolve_callback(AvahiSServiceResolver *r,

1048

996

AvahiIfIndex interface,

1049

997

AvahiProtocol proto,

1057

1005

AVAHI_GCC_UNUSED AvahiStringList *txt,

1058

1006

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1059

1007

flags,

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

1008

AVAHI_GCC_UNUSED void* userdata){

1009

assert(r);

1064

1010

1065

1011

/* Called whenever a service has been resolved successfully or

1066

1012

timed out */

1075

1021

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

1076

1022

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

1077

1023

domain,

1078

avahi_strerror(avahi_server_errno

1079

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

1024

avahi_strerror(avahi_server_errno(mc.server)));

1080

1025

break;

1081

1026

1082

1027

case AVAHI_RESOLVER_FOUND:

1088

1033

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

1089

1034

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

1090

1035

}

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

1036

int ret = start_mandos_communication(ip, port, interface,

1037

avahi_proto_to_af(proto));

1095

1038

if(ret == 0){

1096

avahi_simple_poll_quit(simple_poll);

1039

avahi_simple_poll_quit(mc.simple_poll);

1097

1040

} else {

1098

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

1099

avahi_proto_to_af(proto),

1100

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

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1101

1043

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

1102

1044

" list\n", name);

1103

1045

}

1116

1058

const char *domain,

1117

1059

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1118

1060

flags,

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

1061

AVAHI_GCC_UNUSED void* userdata){

1062

assert(b);

1123

1063

1124

1064

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

1125

1065

is removed from the LAN */

1133

1073

case AVAHI_BROWSER_FAILURE:

1134

1074

1135

1075

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

1136

avahi_strerror(avahi_server_errno

1137

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

1138

avahi_simple_poll_quit(simple_poll);

1076

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_simple_poll_quit(mc.simple_poll);

1139

1078

return;

1140

1079

1141

1080

case AVAHI_BROWSER_NEW:

1144

1083

the callback function is called the Avahi server will free the

1145

1084

resolver for us. */

1146

1085

1147

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

1148

interface, protocol, name, type,

1149

domain, protocol, 0,

1150

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)

1151

1089

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

1152

1090

" %s\n", name,

1153

avahi_strerror(avahi_server_errno

1154

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

1091

avahi_strerror(avahi_server_errno(mc.server)));

1155

1092

break;

1156

1093

1157

1094

case AVAHI_BROWSER_REMOVE:

1176

1113

signal_received = sig;

1177

1114

int old_errno = errno;

1178

1115

/* set main loop to exit */

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1116

if(mc.simple_poll != NULL){

1117

avahi_simple_poll_quit(mc.simple_poll);

1181

1118

}

1182

1119

errno = old_errno;

1183

1120

}

1184

1121

1185

__attribute__((nonnull, warn_unused_result))

1186

1122

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

1187

1123

int ret;

1188

error_t ret_errno;

1189

1124

1190

1125

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

1191

1126

if(s < 0){

1192

ret_errno = errno;

1193

1127

perror_plus("socket");

1194

errno = ret_errno;

1195

1128

return false;

1196

1129

}

1197

1130

strcpy(ifr->ifr_name, ifname);

1198

1131

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1199

1132

if(ret == -1){

1200

1133

if(debug){

1201

ret_errno = errno;

1202

1134

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1204

1135

}

1205

1136

return false;

1206

1137

}

1207

1138

return true;

1208

1139

}

1209

1140

1210

__attribute__((nonnull, warn_unused_result))

1211

1141

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

1212

1142

1213

1143

/* Reject the loopback device */

1255

1185

* corresponds to an acceptable network device.

1256

1186

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

1257

1187

*/

1258

__attribute__((nonnull, warn_unused_result))

1259

1188

int good_interface(const struct dirent *if_entry){

1260

1189

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

1261

1190

return 0;

1277

1206

}

1278

1207

1279

1208

/*

1280

* This function determines if a network interface is up.

1281

*/

1282

__attribute__((nonnull, warn_unused_result))

1283

bool interface_is_up(const char *interface){

1284

struct ifreq ifr;

1285

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

1286

if(debug){

1287

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

1288

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

1289

}

1290

return false;

1291

}

1292

1293

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

1294

}

1295

1296

/*

1297

* This function determines if a network interface is running

1298

*/

1299

__attribute__((nonnull, warn_unused_result))

1300

bool interface_is_running(const char *interface){

1301

struct ifreq ifr;

1302

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

1303

if(debug){

1304

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

1305

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

1306

}

1307

return false;

1308

}

1309

1310

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

1311

}

1312

1313

__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

1314

1251

int notdotentries(const struct dirent *direntry){

1315

1252

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

1316

1253

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

1323

1260

}

1324

1261

1325

1262

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

1326

__attribute__((nonnull, warn_unused_result))

1327

1263

int runnable_hook(const struct dirent *direntry){

1328

1264

int ret;

1329

1265

size_t sret;

1337

1273

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

1338

1274

"abcdefghijklmnopqrstuvwxyz"

1339

1275

"0123456789"

1340

"_.-");

1276

"_-");

1341

1277

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

1342

1278

/* Contains non-allowed characters */

1343

1279

if(debug){

1347

1283

return 0;

1348

1284

}

1349

1285

1350

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);

1351

1294

if(ret == -1){

1352

1295

if(debug){

1353

1296

perror_plus("Could not stat hook");

1377

1320

return 1;

1378

1321

}

1379

1322

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1323

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1383

1324

int ret;

1384

1325

struct timespec now;

1385

1326

struct timespec waited_time;

1386

1327

intmax_t block_time;

1387

1328

1388

1329

while(true){

1389

if(mc->current_server == NULL){

1390

if(debug){

1330

if(mc.current_server == NULL){

1331

if (debug){

1391

1332

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

1392

1333

" No timeout!\n");

1393

1334

}

1394

1335

ret = avahi_simple_poll_iterate(s, -1);

1395

1336

} else {

1396

if(debug){

1337

if (debug){

1397

1338

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

1398

1339

" it, or wait\n");

1399

1340

}

1406

1347

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

1407

1348

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

1408

1349

waited_time.tv_sec = (now.tv_sec

1409

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

1350

- mc.current_server->last_seen.tv_sec);

1410

1351

waited_time.tv_nsec = (now.tv_nsec

1411

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

1352

- mc.current_server->last_seen.tv_nsec);

1412

1353

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

1413

1354

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

1414

1355

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

1416

1357

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

1417

1358

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

1418

1359

1419

if(debug){

1360

if (debug){

1420

1361

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

1421

1362

block_time);

1422

1363

}

1423

1364

1424

1365

if(block_time <= 0){

1425

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

1426

mc->current_server->port,

1427

mc->current_server->if_index,

1428

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);

1429

1370

if(ret == 0){

1430

avahi_simple_poll_quit(s);

1371

avahi_simple_poll_quit(mc.simple_poll);

1431

1372

return 0;

1432

1373

}

1433

1374

ret = clock_gettime(CLOCK_MONOTONIC,

1434

&mc->current_server->last_seen);

1375

&mc.current_server->last_seen);

1435

1376

if(ret == -1){

1436

1377

perror_plus("clock_gettime");

1437

1378

return -1;

1438

1379

}

1439

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

1380

mc.current_server = mc.current_server->next;

1440

1381

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

1441

1382

servers, but don't block */

1442

1383

}

1444

1385

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

1445

1386

}

1446

1387

if(ret != 0){

1447

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

1388

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

1448

1389

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

1449

1390

}

1450

1391

}

1452

1393

}

1453

1394

1454

1395

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

1455

__attribute__((warn_unused_result))

1456

1396

error_t raise_privileges(void){

1457

1397

error_t old_errno = errno;

1458

1398

error_t ret_errno = 0;

1465

1405

}

1466

1406

1467

1407

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

1468

__attribute__((warn_unused_result))

1469

1408

error_t raise_privileges_permanently(void){

1470

1409

error_t old_errno = errno;

1471

1410

error_t ret_errno = raise_privileges();

1482

1421

}

1483

1422

1484

1423

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

1485

__attribute__((warn_unused_result))

1486

1424

error_t lower_privileges(void){

1487

1425

error_t old_errno = errno;

1488

1426

error_t ret_errno = 0;

1494

1432

return ret_errno;

1495

1433

}

1496

1434

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

perror_plus("setuid");

1505

}

1506

errno = old_errno;

1507

return ret_errno;

1508

}

1509

1510

__attribute__((nonnull))

1511

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

1435

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

1512

1436

const float delay){

1513

struct dirent **direntries = NULL;

1514

if(hookdir_fd == -1){

1515

hookdir_fd = open(hookdir, O_RDONLY);

1516

if(hookdir_fd == -1){

1517

if(errno == ENOENT){

1518

if(debug){

1519

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

1520

" found\n", hookdir);

1521

}

1522

} else {

1523

perror_plus("open");

1524

}

1525

return;

1526

}

1527

}

1528

#ifdef __GLIBC__

1529

#if __GLIBC_PREREQ(2, 15)

1530

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

1531

runnable_hook, alphasort);

1532

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

1533

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

1534

alphasort);

1535

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

1536

#else /* not __GLIBC__ */

1537

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

1538

alphasort);

1539

#endif /* not __GLIBC__ */

1437

struct dirent **direntries;

1438

struct dirent *direntry;

1439

int ret;

1440

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

1441

alphasort);

1540

1442

if(numhooks == -1){

1541

1443

perror_plus("scandir");

1542

return;

1543

}

1544

struct dirent *direntry;

1545

int ret;

1546

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

1547

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

1548

direntry = direntries[i];

1549

if(debug){

1550

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

1551

direntry->d_name);

1552

}

1553

pid_t hook_pid = fork();

1554

if(hook_pid == 0){

1555

/* Child */

1556

/* Raise privileges */

1557

if(raise_privileges_permanently() != 0){

1558

perror_plus("Failed to raise privileges");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Set group */

1562

errno = 0;

1563

ret = setgid(0);

1564

if(ret == -1){

1565

perror_plus("setgid");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Reset supplementary groups */

1569

errno = 0;

1570

ret = setgroups(0, NULL);

1571

if(ret == -1){

1572

perror_plus("setgroups");

1573

_exit(EX_NOPERM);

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

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

1591

if(ret == -1){

1592

perror_plus("setenv");

1593

_exit(EX_OSERR);

1594

}

1595

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

1596

if(ret == -1){

1597

perror_plus("setenv");

1598

_exit(EX_OSERR);

1599

}

1600

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

1601

if(ret == -1){

1602

perror_plus("setenv");

1603

_exit(EX_OSERR);

1604

}

1605

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

1606

if(ret == -1){

1607

perror_plus("setenv");

1608

_exit(EX_OSERR);

1609

}

1610

char *delaystring;

1611

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

1612

if(ret == -1){

1444

} else {

1445

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

1446

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

1447

direntry = direntries[i];

1448

char *fullname = NULL;

1449

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

1450

if(ret < 0){

1613

1451

perror_plus("asprintf");

1614

_exit(EX_OSERR);

1615

}

1616

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

1617

if(ret == -1){

1452

continue;

1453

}

1454

if(debug){

1455

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

1456

direntry->d_name);

1457

}

1458

pid_t hook_pid = fork();

1459

if(hook_pid == 0){

1460

/* Child */

1461

/* Raise privileges */

1462

raise_privileges_permanently();

1463

/* Set group */

1464

errno = 0;

1465

ret = setgid(0);

1466

if(ret == -1){

1467

perror_plus("setgid");

1468

}

1469

/* Reset supplementary groups */

1470

errno = 0;

1471

ret = setgroups(0, NULL);

1472

if(ret == -1){

1473

perror_plus("setgroups");

1474

}

1475

dup2(devnull, STDIN_FILENO);

1476

close(devnull);

1477

dup2(STDERR_FILENO, STDOUT_FILENO);

1478

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

1479

if(ret == -1){

1480

perror_plus("setenv");

1481

_exit(EX_OSERR);

1482

}

1483

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

1484

if(ret == -1){

1485

perror_plus("setenv");

1486

_exit(EX_OSERR);

1487

}

1488

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

1489

if(ret == -1){

1490

perror_plus("setenv");

1491

_exit(EX_OSERR);

1492

}

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

char *delaystring;

1499

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

1500

if(ret == -1){

1501

perror_plus("asprintf");

1502

_exit(EX_OSERR);

1503

}

1504

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

1505

if(ret == -1){

1506

free(delaystring);

1507

perror_plus("setenv");

1508

_exit(EX_OSERR);

1509

}

1618

1510

free(delaystring);

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

free(delaystring);

1623

if(connect_to != NULL){

1624

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

1625

if(ret == -1){

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

}

1630

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

1631

if(hook_fd == -1){

1632

perror_plus("openat");

1633

_exit(EXIT_FAILURE);

1634

}

1635

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

1636

perror_plus("close");

1637

_exit(EXIT_FAILURE);

1638

}

1639

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

1640

environ) == -1){

1641

perror_plus("fexecve");

1642

_exit(EXIT_FAILURE);

1643

}

1644

} else {

1645

int status;

1646

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

1647

perror_plus("waitpid");

1648

continue;

1649

}

1650

if(WIFEXITED(status)){

1651

if(WEXITSTATUS(status) != 0){

1652

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

1653

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

1654

WEXITSTATUS(status));

1655

continue;

1656

}

1657

} else if(WIFSIGNALED(status)){

1658

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

1659

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

1660

WTERMSIG(status));

1661

continue;

1511

if(connect_to != NULL){

1512

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

1513

if(ret == -1){

1514

perror_plus("setenv");

1515

_exit(EX_OSERR);

1516

}

1517

}

1518

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

1519

perror_plus("execl");

1520

_exit(EXIT_FAILURE);

1521

}

1662

1522

} else {

1663

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

1664

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

1665

continue;

1666

}

1667

}

1668

if(debug){

1669

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

1670

direntry->d_name);

1671

}

1672

}

1673

free(direntries);

1674

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

1675

perror_plus("close");

1676

} else {

1677

hookdir_fd = -1;

1678

}

1679

close(devnull);

1523

int status;

1524

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

1525

perror_plus("waitpid");

1526

free(fullname);

1527

continue;

1528

}

1529

if(WIFEXITED(status)){

1530

if(WEXITSTATUS(status) != 0){

1531

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

1532

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

1533

WEXITSTATUS(status));

1534

free(fullname);

1535

continue;

1536

}

1537

} else if(WIFSIGNALED(status)){

1538

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

1539

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

1540

WTERMSIG(status));

1541

free(fullname);

1542

continue;

1543

} else {

1544

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

1545

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

1546

free(fullname);

1547

continue;

1548

}

1549

}

1550

free(fullname);

1551

if(debug){

1552

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

1553

direntry->d_name);

1554

}

1555

}

1556

close(devnull);

1557

}

1558

return true;

1680

1559

}

1681

1560

1682

__attribute__((nonnull, warn_unused_result))

1683

error_t bring_up_interface(const char *const interface,

1684

const float delay){

1685

error_t old_errno = errno;

1561

int bring_up_interface(const char *const interface,

1562

const float delay){

1563

int sd = -1;

1564

int old_errno = errno;

1565

int ret_errno = 0;

1686

1566

int ret;

1687

1567

struct ifreq network;

1688

unsigned int if_index = if_nametoindex(interface);

1568

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1689

1569

if(if_index == 0){

1690

1570

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

1691

1571

errno = old_errno;

1697

1577

return EINTR;

1698

1578

}

1699

1579

1700

if(not interface_is_up(interface)){

1701

error_t ret_errno = 0, ioctl_errno = 0;

1702

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

1703

ret_errno = errno;

1704

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

1705

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

1706

errno = old_errno;

1707

return ret_errno;

1708

}

1709

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

1710

1711

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

1712

if(sd == -1){

1713

ret_errno = errno;

1714

perror_plus("socket");

1715

errno = old_errno;

1716

return ret_errno;

1717

}

1718

1719

if(quit_now){

1720

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

1721

if(ret == -1){

1722

perror_plus("close");

1723

}

1724

errno = old_errno;

1725

return EINTR;

1726

}

1727

1728

if(debug){

1729

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

1730

interface);

1731

}

1732

1733

/* Raise privileges */

1734

ret_errno = raise_privileges();

1735

if(ret_errno != 0){

1736

perror_plus("Failed to raise privileges");

1737

}

1738

1739

#ifdef __linux__

1740

int ret_linux;

1741

bool restore_loglevel = false;

1742

if(ret_errno == 0){

1743

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1744

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

1745

ret_linux = klogctl(8, NULL, 5);

1746

if(ret_linux == -1){

1747

perror_plus("klogctl");

1748

} else {

1749

restore_loglevel = true;

1750

}

1751

}

1752

#endif /* __linux__ */

1753

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

1754

ioctl_errno = errno;

1755

#ifdef __linux__

1756

if(restore_loglevel){

1757

ret_linux = klogctl(7, NULL, 0);

1758

if(ret_linux == -1){

1759

perror_plus("klogctl");

1760

}

1761

}

1762

#endif /* __linux__ */

1763

1764

/* If raise_privileges() succeeded above */

1765

if(ret_errno == 0){

1766

/* Lower privileges */

1767

ret_errno = lower_privileges();

1768

if(ret_errno != 0){

1769

errno = ret_errno;

1770

perror_plus("Failed to lower privileges");

1771

}

1772

}

1773

1774

/* Close the socket */

1775

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

1580

/* Re-raise priviliges */

1581

raise_privileges();

1582

1583

#ifdef __linux__

1584

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1585

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

1586

ret = klogctl(8, NULL, 5);

1587

bool restore_loglevel = true;

1588

if(ret == -1){

1589

restore_loglevel = false;

1590

perror_plus("klogctl");

1591

}

1592

#endif /* __linux__ */

1593

1594

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1595

if(sd < 0){

1596

ret_errno = errno;

1597

perror_plus("socket");

1598

#ifdef __linux__

1599

if(restore_loglevel){

1600

ret = klogctl(7, NULL, 0);

1601

if(ret == -1){

1602

perror_plus("klogctl");

1603

}

1604

}

1605

#endif /* __linux__ */

1606

/* Lower privileges */

1607

lower_privileges();

1608

errno = old_errno;

1609

return ret_errno;

1610

}

1611

strcpy(network.ifr_name, interface);

1612

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

1613

if(ret == -1){

1614

ret_errno = errno;

1615

perror_plus("ioctl SIOCGIFFLAGS");

1616

#ifdef __linux__

1617

if(restore_loglevel){

1618

ret = klogctl(7, NULL, 0);

1619

if(ret == -1){

1620

perror_plus("klogctl");

1621

}

1622

}

1623

#endif /* __linux__ */

1624

/* Lower privileges */

1625

lower_privileges();

1626

errno = old_errno;

1627

return ret_errno;

1628

}

1629

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

1630

network.ifr_flags |= IFF_UP;

1631

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

1776

1632

if(ret == -1){

1777

perror_plus("close");

1778

}

1779

1780

if(ret_setflags == -1){

1781

errno = ioctl_errno;

1633

ret_errno = errno;

1782

1634

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1635

#ifdef __linux__

1636

if(restore_loglevel){

1637

ret = klogctl(7, NULL, 0);

1638

if(ret == -1){

1639

perror_plus("klogctl");

1640

}

1641

}

1642

#endif /* __linux__ */

1643

/* Lower privileges */

1644

lower_privileges();

1783

1645

errno = old_errno;

1784

return ioctl_errno;

1646

return ret_errno;

1785

1647

}

1786

} else if(debug){

1787

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

1788

interface);

1789

1648

}

1790

1791

1649

/* Sleep checking until interface is running.

1792

1650

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

1793

1651

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

1794

if(interface_is_running(interface)){

1652

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

1653

if(ret == -1){

1654

perror_plus("ioctl SIOCGIFFLAGS");

1655

} else if(network.ifr_flags & IFF_RUNNING){

1795

1656

break;

1796

1657

}

1797

1658

struct timespec sleeptime = { .tv_nsec = 250000000 };

1800

1661

perror_plus("nanosleep");

1801

1662

}

1802

1663

}

1803

1804

errno = old_errno;

1805

return 0;

1806

}

1807

1808

__attribute__((nonnull, warn_unused_result))

1809

error_t take_down_interface(const char *const interface){

1810

error_t old_errno = errno;

1811

struct ifreq network;

1812

unsigned int if_index = if_nametoindex(interface);

1813

if(if_index == 0){

1814

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

1815

errno = old_errno;

1816

return ENXIO;

1664

/* Close the socket */

1665

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

1666

if(ret == -1){

1667

perror_plus("close");

1817

1668

}

1818

if(interface_is_up(interface)){

1819

error_t ret_errno = 0, ioctl_errno = 0;

1820

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

1821

ret_errno = errno;

1822

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

1823

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

1824

errno = old_errno;

1825

return ret_errno;

1826

}

1827

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

1828

1829

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

1830

if(sd == -1){

1831

ret_errno = errno;

1832

perror_plus("socket");

1833

errno = old_errno;

1834

return ret_errno;

1835

}

1836

1837

if(debug){

1838

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

1839

interface);

1840

}

1841

1842

/* Raise privileges */

1843

ret_errno = raise_privileges();

1844

if(ret_errno != 0){

1845

perror_plus("Failed to raise privileges");

1846

}

1847

1848

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

1849

ioctl_errno = errno;

1850

1851

/* If raise_privileges() succeeded above */

1852

if(ret_errno == 0){

1853

/* Lower privileges */

1854

ret_errno = lower_privileges();

1855

if(ret_errno != 0){

1856

errno = ret_errno;

1857

perror_plus("Failed to lower privileges");

1858

}

1859

}

1860

1861

/* Close the socket */

1862

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

1669

#ifdef __linux__

1670

if(restore_loglevel){

1671

/* Restores kernel loglevel to default */

1672

ret = klogctl(7, NULL, 0);

1863

1673

if(ret == -1){

1864

perror_plus("close");

1865

}

1866

1867

if(ret_setflags == -1){

1868

errno = ioctl_errno;

1869

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1870

errno = old_errno;

1871

return ioctl_errno;

1872

}

1873

} else if(debug){

1874

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

1875

interface);

1674

perror_plus("klogctl");

1675

}

1876

1676

}

1877

1677

#endif /* __linux__ */

1678

/* Lower privileges */

1679

lower_privileges();

1878

1680

errno = old_errno;

1879

1681

return 0;

1880

1682

}

1881

1683

1882

1684

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

1883

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

1884

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

1885

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

1886

.interfaces = NULL, .interfaces_size = 0 };

1887

1685

AvahiSServiceBrowser *sb = NULL;

1888

error_t ret_errno;

1686

int error;

1889

1687

int ret;

1890

1688

intmax_t tmpmax;

1891

1689

char *tmp;

1892

1690

int exitcode = EXIT_SUCCESS;

1893

char *interfaces_to_take_down = NULL;

1894

size_t interfaces_to_take_down_size = 0;

1895

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

1896

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

1897

char *tempdir = NULL;

1691

const char *interface = "";

1692

struct ifreq network;

1693

int sd = -1;

1694

bool take_down_interface = false;

1695

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

1696

bool tempdir_created = false;

1898

1697

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1899

1698

const char *seckey = PATHDIR "/" SECKEY;

1900

1699

const char *pubkey = PATHDIR "/" PUBKEY;

1901

char *interfaces_hooks = NULL;

1902

1700

1903

1701

bool gnutls_initialized = false;

1904

1702

bool gpgme_initialized = false;

1995

1793

connect_to = arg;

1996

1794

break;

1997

1795

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

1998

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

1999

arg, (int)',');

2000

if(ret_errno != 0){

2001

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

2002

}

1796

interface = arg;

2003

1797

break;

2004

1798

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

2005

1799

seckey = arg;

2082

1876

/* Work around Debian bug #633582:

2083

1877

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

2084

1878

2085

/* Re-raise privileges */

2086

ret_errno = raise_privileges();

2087

if(ret_errno != 0){

2088

errno = ret_errno;

2089

perror_plus("Failed to raise privileges");

2090

} else {

1879

/* Re-raise priviliges */

1880

if(raise_privileges() == 0){

2091

1881

struct stat st;

2092

1882

2093

1883

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

2133

1923

}

2134

1924

2135

1925

/* Lower privileges */

2136

ret_errno = lower_privileges();

2137

if(ret_errno != 0){

2138

errno = ret_errno;

2139

perror_plus("Failed to lower privileges");

2140

}

2141

}

2142

}

2143

2144

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

2145

{

2146

char *interface = NULL;

2147

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

2148

interface))){

2149

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

2150

and if_nametoindex(interface) == 0){

2151

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

2152

fprintf_plus(stderr, "Not using nonexisting interface"

2153

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

2154

}

2155

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

2156

interface = NULL;

1926

errno = 0;

1927

ret = seteuid(uid);

1928

if(ret == -1){

1929

perror_plus("seteuid");

2157

1930

}

2158

1931

}

2159

1932

}

2160

1933

2161

1934

/* Run network hooks */

2162

{

2163

if(mc.interfaces != NULL){

2164

interfaces_hooks = malloc(mc.interfaces_size);

2165

if(interfaces_hooks == NULL){

1935

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

1936

goto end;

1937

}

1938

1939

if(not debug){

1940

avahi_set_log_function(empty_log);

1941

}

1942

1943

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

1944

struct dirent **direntries;

1945

/* First look for interfaces that are up */

1946

ret = scandir(sys_class_net, &direntries, up_interface,

1947

alphasort);

1948

if(ret == 0){

1949

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

1950

free(direntries);

1951

ret = scandir(sys_class_net, &direntries, good_interface,

1952

alphasort);

1953

}

1954

if(ret >= 1){

1955

/* Pick the first interface returned */

1956

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

1957

if(debug){

1958

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

1959

}

1960

if(interface == NULL){

2166

1961

perror_plus("malloc");

1962

free(direntries);

1963

exitcode = EXIT_FAILURE;

2167

1964

goto end;

2168

1965

}

2169

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

2170

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

1966

free(direntries);

1967

} else {

1968

free(direntries);

1969

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

1970

exitcode = EXIT_FAILURE;

1971

goto end;

2171

1972

}

2172

run_network_hooks("start", interfaces_hooks != NULL ?

2173

interfaces_hooks : "", delay);

2174

}

2175

2176

if(not debug){

2177

avahi_set_log_function(empty_log);

2178

1973

}

2179

1974

2180

1975

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

2181

1976

from the signal handler */

2182

1977

/* Initialize the pseudo-RNG for Avahi */

2183

1978

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

2184

simple_poll = avahi_simple_poll_new();

2185

if(simple_poll == NULL){

1979

mc.simple_poll = avahi_simple_poll_new();

1980

if(mc.simple_poll == NULL){

2186

1981

fprintf_plus(stderr,

2187

1982

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

2188

1983

exitcode = EX_UNAVAILABLE;

2252

2047

}

2253

2048

}

2254

2049

2255

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

2256

if(mc.interfaces == NULL){

2257

struct dirent **direntries = NULL;

2258

/* Look for any good interfaces */

2259

ret = scandir(sys_class_net, &direntries, good_interface,

2260

alphasort);

2261

if(ret >= 1){

2262

/* Add all found interfaces to interfaces list */

2263

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

2264

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

2265

direntries[i]->d_name);

2266

if(ret_errno != 0){

2267

errno = ret_errno;

2268

perror_plus("argz_add");

2269

continue;

2270

}

2271

if(debug){

2272

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

2273

direntries[i]->d_name);

2274

}

2275

}

2276

free(direntries);

2277

} else {

2278

if(ret == 0){

2279

free(direntries);

2280

}

2281

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

2282

exitcode = EXIT_FAILURE;

2283

goto end;

2284

}

2285

}

2286

2287

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

2288

{

2289

char *interface = NULL;

2290

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

2291

interface))){

2292

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

2293

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

2294

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

2295

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

2296

interface);

2297

interface = NULL;

2298

while((interface = argz_next(mc.interfaces,

2299

mc.interfaces_size, interface))){

2300

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

2301

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

2302

interface);

2303

interface = NULL;

2304

}

2305

}

2306

break;

2307

}

2308

bool interface_was_up = interface_is_up(interface);

2309

errno = bring_up_interface(interface, delay);

2310

if(not interface_was_up){

2311

if(errno != 0){

2312

perror_plus("Failed to bring up interface");

2313

} else {

2314

errno = argz_add(&interfaces_to_take_down,

2315

&interfaces_to_take_down_size,

2316

interface);

2317

if(errno != 0){

2318

perror_plus("argz_add");

2319

}

2320

}

2321

}

2322

}

2323

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

2324

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

2325

}

2326

}

2327

2328

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

2329

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

2330

if(debug){

2331

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

2332

mc.interfaces);

2333

}

2334

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

2050

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

2051

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

2052

ret = bring_up_interface(interface, delay);

2053

if(ret != 0){

2054

errno = ret;

2055

perror_plus("Failed to bring up interface");

2056

}

2335

2057

}

2336

2058

2337

2059

if(quit_now){

2338

2060

goto end;

2339

2061

}

2340

2062

2341

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

2063

ret = init_gnutls_global(pubkey, seckey);

2342

2064

if(ret == -1){

2343

2065

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

2344

2066

exitcode = EX_UNAVAILABLE;

2351

2073

goto end;

2352

2074

}

2353

2075

2354

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

2355

tempdir = mkdtemp(run_tempdir);

2356

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

2357

if(debug){

2358

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

2359

run_tempdir, old_tempdir);

2360

}

2361

tempdir = mkdtemp(old_tempdir);

2362

}

2363

if(tempdir == NULL){

2076

if(mkdtemp(tempdir) == NULL){

2364

2077

perror_plus("mkdtemp");

2365

2078

goto end;

2366

2079

}

2080

tempdir_created = true;

2367

2081

2368

2082

if(quit_now){

2369

2083

goto end;

2370

2084

}

2371

2085

2372

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

2086

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

2373

2087

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

2374

2088

exitcode = EX_UNAVAILABLE;

2375

2089

goto end;

2396

2110

goto end;

2397

2111

}

2398

2112

2399

in_port_t port;

2113

uint16_t port;

2400

2114

errno = 0;

2401

2115

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

2402

2116

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

2403

or tmpmax != (in_port_t)tmpmax){

2117

or tmpmax != (uint16_t)tmpmax){

2404

2118

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

2405

2119

exitcode = EX_USAGE;

2406

2120

goto end;

2407

2121

}

2408

2122

2409

2123

if(quit_now){

2410

2124

goto end;

2411

2125

}

2412

2126

2413

port = (in_port_t)tmpmax;

2127

port = (uint16_t)tmpmax;

2414

2128

*address = '\0';

2415

2129

/* Colon in address indicates IPv6 */

2416

2130

int af;

2432

2146

}

2433

2147

2434

2148

while(not quit_now){

2435

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

2436

&mc);

2149

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

2437

2150

if(quit_now or ret == 0){

2438

2151

break;

2439

2152

}

2441

2154

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

2442

2155

(int)retry_interval);

2443

2156

}

2444

sleep((unsigned int)retry_interval);

2157

sleep((int)retry_interval);

2445

2158

}

2446

2159

2447

if(not quit_now){

2160

if (not quit_now){

2448

2161

exitcode = EXIT_SUCCESS;

2449

2162

}

2450

2163

2465

2178

config.publish_domain = 0;

2466

2179

2467

2180

/* Allocate a new server */

2468

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2469

&config, NULL, NULL, &ret_errno);

2181

mc.server = avahi_server_new(avahi_simple_poll_get

2182

(mc.simple_poll), &config, NULL,

2183

NULL, &error);

2470

2184

2471

2185

/* Free the Avahi configuration data */

2472

2186

avahi_server_config_free(&config);

2475

2189

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

2476

2190

if(mc.server == NULL){

2477

2191

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

2478

avahi_strerror(ret_errno));

2192

avahi_strerror(error));

2479

2193

exitcode = EX_UNAVAILABLE;

2480

2194

goto end;

2481

2195

}

2487

2201

/* Create the Avahi service browser */

2488

2202

sb = avahi_s_service_browser_new(mc.server, if_index,

2489

2203

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2490

NULL, 0, browse_callback,

2491

(void *)&mc);

2204

NULL, 0, browse_callback, NULL);

2492

2205

if(sb == NULL){

2493

2206

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

2494

2207

avahi_strerror(avahi_server_errno(mc.server)));

2505

2218

if(debug){

2506

2219

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

2507

2220

}

2508

2509

ret = avahi_loop_with_timeout(simple_poll,

2510

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

2221

2222

ret = avahi_loop_with_timeout(mc.simple_poll,

2223

(int)(retry_interval * 1000));

2511

2224

if(debug){

2512

2225

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

2513

2226

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

2520

2233

}

2521

2234

2522

2235

/* Cleanup things */

2523

free(mc.interfaces);

2524

2525

2236

if(sb != NULL)

2526

2237

avahi_s_service_browser_free(sb);

2527

2238

2528

2239

if(mc.server != NULL)

2529

2240

avahi_server_free(mc.server);

2530

2241

2531

if(simple_poll != NULL)

2532

avahi_simple_poll_free(simple_poll);

2242

if(mc.simple_poll != NULL)

2243

avahi_simple_poll_free(mc.simple_poll);

2533

2244

2534

2245

if(gnutls_initialized){

2535

2246

gnutls_certificate_free_credentials(mc.cred);

2552

2263

}

2553

2264

}

2554

2265

2555

/* Re-raise privileges */

2266

/* Run network hooks */

2267

run_network_hooks("stop", interface, delay);

2268

2269

/* Re-raise priviliges */

2556

2270

{

2557

ret_errno = raise_privileges();

2558

if(ret_errno != 0){

2559

perror_plus("Failed to raise privileges");

2560

} else {

2561

2562

/* Run network hooks */

2563

run_network_hooks("stop", interfaces_hooks != NULL ?

2564

interfaces_hooks : "", delay);

2565

2566

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

2567

{

2568

char *interface = NULL;

2569

while((interface=argz_next(interfaces_to_take_down,

2570

interfaces_to_take_down_size,

2571

interface))){

2572

ret_errno = take_down_interface(interface);

2573

if(ret_errno != 0){

2574

errno = ret_errno;

2575

perror_plus("Failed to take down interface");

2576

}

2577

}

2578

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

2579

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

2580

" down\n");

2581

}

2582

}

2583

}

2271

raise_privileges();

2584

2272

2585

ret_errno = lower_privileges_permanently();

2586

if(ret_errno != 0){

2587

perror_plus("Failed to lower privileges permanently");

2273

/* Take down the network interface */

2274

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

2275

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

2276

if(ret == -1){

2277

perror_plus("ioctl SIOCGIFFLAGS");

2278

} else if(network.ifr_flags & IFF_UP){

2279

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

2280

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

2281

if(ret == -1){

2282

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2283

}

2284

}

2285

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

2286

if(ret == -1){

2287

perror_plus("close");

2288

}

2588

2289

}

2589

2290

}

2590

2591

free(interfaces_to_take_down);

2592

free(interfaces_hooks);

2291

/* Lower privileges permanently */

2292

errno = 0;

2293

ret = setuid(uid);

2294

if(ret == -1){

2295

perror_plus("setuid");

2296

}

2593

2297

2594

2298

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

2595

if(tempdir != NULL){

2299

if(tempdir_created){

2596

2300

struct dirent **direntries = NULL;

2597

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

2598

O_NOFOLLOW));

2599

if(tempdir_fd == -1){

2600

perror_plus("open");

2601

} else {

2602

#ifdef __GLIBC__

2603

#if __GLIBC_PREREQ(2, 15)

2604

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

2605

notdotentries, alphasort);

2606

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

2607

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

2608

alphasort);

2609

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

2610

#else /* not __GLIBC__ */

2611

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

2612

alphasort);

2613

#endif /* not __GLIBC__ */

2614

if(numentries >= 0){

2615

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

2616

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

2617

if(ret == -1){

2618

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

2619

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

2620

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

2621

}

2622

}

2623

2624

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

2625

free(direntries);

2626

if(numentries == -1){

2627

perror_plus("scandir");

2628

}

2629

ret = rmdir(tempdir);

2630

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

2631

perror_plus("rmdir");

2632

}

2301

struct dirent *direntry = NULL;

2302

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

2303

alphasort);

2304

if (numentries > 0){

2305

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

2306

direntry = direntries[i];

2307

char *fullname = NULL;

2308

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

2309

direntry->d_name);

2310

if(ret < 0){

2311

perror_plus("asprintf");

2312

continue;

2313

}

2314

ret = remove(fullname);

2315

if(ret == -1){

2316

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

2317

strerror(errno));

2318

}

2319

free(fullname);

2633

2320

}

2634

TEMP_FAILURE_RETRY(close(tempdir_fd));

2321

}

2322

2323

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

2324

free(direntries);

2325

if (numentries == -1){

2326

perror_plus("scandir");

2327

}

2328

ret = rmdir(tempdir);

2329

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

2330

perror_plus("rmdir");

2635

2331

}

2636

2332

}

2637

2333