/mandos/release : revision 237.7.255

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

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

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

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42

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

43

stdout, ferror(), remove() */

43

stdout, ferror() */

44

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

45

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

46

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

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

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

61

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

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62

*/

62

63

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

63

64

strtoimax() */

64

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

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

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program_invocation_short_name */

67

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

73

*/

74

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

75

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

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

77

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

76

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

77

unlinkat() */

78

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

78

79

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

79

80

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

80

81

argp_state, struct argp,

88

89

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

89

90

WEXITSTATUS(), WTERMSIG() */

90

91

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

92

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

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argz_delete(), argz_append(),

94

argz_stringify(), argz_add(),

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

91

98

92

99

#ifdef __linux__

93

100

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

135

142

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

136

143

char *connect_to = NULL;

137

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

138

146

uid_t uid = 65534;

139

147

gid_t gid = 65534;

140

148

141

149

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

142

150

typedef struct server{

143

151

const char *ip;

144

uint16_t port;

152

in_port_t port;

145

153

AvahiIfIndex if_index;

146

154

int af;

147

155

struct timespec last_seen;

151

159

152

160

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

153

161

typedef struct {

154

AvahiSimplePoll *simple_poll;

155

162

AvahiServer *server;

156

163

gnutls_certificate_credentials_t cred;

157

164

unsigned int dh_bits;

159

166

const char *priority;

160

167

gpgme_ctx_t ctx;

161

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

162

171

} mandos_context;

163

172

164

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

165

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

166

.dh_bits = 1024, .priority = "SECURE256"

167

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

168

.current_server = NULL };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

169

175

170

176

sig_atomic_t quit_now = 0;

171

177

int signal_received = 0;

179

185

perror(print_text);

180

186

}

181

187

182

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

188

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

183

189

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

184

190

va_list ap;

185

191

va_start (ap, format);

186

192

187

193

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

188

194

program_invocation_short_name));

189

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

195

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

190

196

}

191

197

192

198

/*

194

200

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

195

201

* "buffer_length" is how much is already used.

196

202

*/

203

__attribute__((nonnull, warn_unused_result))

197

204

size_t incbuffer(char **buffer, size_t buffer_length,

198

205

size_t buffer_capacity){

199

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

200

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

201

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

202

213

return 0;

203

214

}

215

*buffer = new_buf;

204

216

buffer_capacity += BUFFER_SIZE;

205

217

}

206

218

return buffer_capacity;

207

219

}

208

220

209

221

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

210

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

211

int af){

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

212

225

int ret;

213

226

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

214

227

if(new_server == NULL){

223

236

perror_plus("strdup");

224

237

return false;

225

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

226

244

/* Special case of first server */

227

if (mc.current_server == NULL){

245

if(*current_server == NULL){

228

246

new_server->next = new_server;

229

247

new_server->prev = new_server;

230

mc.current_server = new_server;

231

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

248

*current_server = new_server;

232

249

} else {

233

new_server->next = mc.current_server;

234

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

250

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

251

new_server->next = *current_server;

252

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

235

253

new_server->prev->next = new_server;

236

mc.current_server->prev = new_server;

237

}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

254

(*current_server)->prev = new_server;

242

255

}

243

256

return true;

244

257

}

246

259

/*

247

260

* Initialize GPGME.

248

261

*/

249

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

250

const char *tempdir){

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){

251

267

gpgme_error_t rc;

252

268

gpgme_engine_info_t engine_info;

253

269

254

255

270

/*

256

271

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

257

272

*/

258

bool import_key(const char *filename){

273

bool import_key(const char * const filename){

259

274

int ret;

260

275

int fd;

261

276

gpgme_data_t pgp_data;

273

288

return false;

274

289

}

275

290

276

rc = gpgme_op_import(mc.ctx, pgp_data);

291

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

277

292

if(rc != GPG_ERR_NO_ERROR){

278

293

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

279

294

gpgme_strsource(rc), gpgme_strerror(rc));

323

338

}

324

339

325

340

/* Create new GPGME "context" */

326

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

341

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

327

342

if(rc != GPG_ERR_NO_ERROR){

328

343

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

329

344

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

342

357

* Decrypt OpenPGP data.

343

358

* Returns -1 on error

344

359

*/

360

__attribute__((nonnull, warn_unused_result))

345

361

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

362

size_t crypto_size,

347

char **plaintext){

363

char **plaintext,

364

mandos_context *mc){

348

365

gpgme_data_t dh_crypto, dh_plain;

349

366

gpgme_error_t rc;

350

367

ssize_t ret;

376

393

377

394

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

378

395

data buffer */

379

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

396

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

380

397

if(rc != GPG_ERR_NO_ERROR){

381

398

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

382

399

gpgme_strsource(rc), gpgme_strerror(rc));

383

400

plaintext_length = -1;

384

401

if(debug){

385

402

gpgme_decrypt_result_t result;

386

result = gpgme_op_decrypt_result(mc.ctx);

403

result = gpgme_op_decrypt_result(mc->ctx);

387

404

if(result == NULL){

388

405

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

389

406

} else {

466

483

return plaintext_length;

467

484

}

468

485

469

static const char * safer_gnutls_strerror(int value){

470

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

471

-Wunreachable-code */

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

const char *ret = gnutls_strerror(value);

472

489

if(ret == NULL)

473

490

ret = "(unknown)";

474

491

return ret;

475

492

}

476

493

477

494

/* GnuTLS log function callback */

495

__attribute__((nonnull))

478

496

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

479

497

const char* string){

480

498

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

481

499

}

482

500

501

__attribute__((nonnull, warn_unused_result))

483

502

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename){

503

const char *seckeyfilename,

504

mandos_context *mc){

485

505

int ret;

486

506

487

507

if(debug){

504

524

}

505

525

506

526

/* OpenPGP credentials */

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

508

528

if(ret != GNUTLS_E_SUCCESS){

509

529

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

510

530

safer_gnutls_strerror(ret));

520

540

}

521

541

522

542

ret = gnutls_certificate_set_openpgp_key_file

523

(mc.cred, pubkeyfilename, seckeyfilename,

543

(mc->cred, pubkeyfilename, seckeyfilename,

524

544

GNUTLS_OPENPGP_FMT_BASE64);

525

545

if(ret != GNUTLS_E_SUCCESS){

526

546

fprintf_plus(stderr,

532

552

}

533

553

534

554

/* GnuTLS server initialization */

535

ret = gnutls_dh_params_init(&mc.dh_params);

555

ret = gnutls_dh_params_init(&mc->dh_params);

536

556

if(ret != GNUTLS_E_SUCCESS){

537

557

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

558

" initialization: %s\n",

539

559

safer_gnutls_strerror(ret));

540

560

goto globalfail;

541

561

}

542

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

562

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

543

563

if(ret != GNUTLS_E_SUCCESS){

544

564

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

545

565

safer_gnutls_strerror(ret));

546

566

goto globalfail;

547

567

}

548

568

549

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

569

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

550

570

551

571

return 0;

552

572

553

573

globalfail:

554

574

555

gnutls_certificate_free_credentials(mc.cred);

575

gnutls_certificate_free_credentials(mc->cred);

556

576

gnutls_global_deinit();

557

gnutls_dh_params_deinit(mc.dh_params);

577

gnutls_dh_params_deinit(mc->dh_params);

558

578

return -1;

559

579

}

560

580

561

static int init_gnutls_session(gnutls_session_t *session){

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

562

584

int ret;

563

585

/* GnuTLS session creation */

564

586

do {

576

598

{

577

599

const char *err;

578

600

do {

579

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

601

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

580

602

if(quit_now){

581

603

gnutls_deinit(*session);

582

604

return -1;

593

615

594

616

do {

595

617

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

596

mc.cred);

618

mc->cred);

597

619

if(quit_now){

598

620

gnutls_deinit(*session);

599

621

return -1;

609

631

/* ignore client certificate if any. */

610

632

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

611

633

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

613

635

614

636

return 0;

615

637

}

619

641

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

620

642

621

643

/* Called when a Mandos server is found */

622

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

644

__attribute__((nonnull, warn_unused_result))

645

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

623

646

AvahiIfIndex if_index,

624

int af){

647

int af, mandos_context *mc){

625

648

int ret, tcp_sd = -1;

626

649

ssize_t sret;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

650

struct sockaddr_storage to;

631

651

char *buffer = NULL;

632

652

char *decrypted_buffer = NULL;

633

653

size_t buffer_length = 0;

657

677

return -1;

658

678

}

659

679

660

ret = init_gnutls_session(&session);

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);

661

713

if(ret != 0){

662

714

return -1;

663

715

}

664

716

665

717

if(debug){

666

718

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

667

PRIu16 "\n", ip, port);

719

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

668

720

}

669

721

670

722

tcp_sd = socket(pf, SOCK_STREAM, 0);

682

734

683

735

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

684

736

if(af == AF_INET6){

685

to.in6.sin6_family = (sa_family_t)af;

686

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

737

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

738

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

687

739

} else { /* IPv4 */

688

to.in.sin_family = (sa_family_t)af;

689

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

740

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

741

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

690

742

}

691

743

if(ret < 0 ){

692

744

int e = errno;

701

753

goto mandos_end;

702

754

}

703

755

if(af == AF_INET6){

704

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

705

-Wconversion and

706

-Wunreachable-code */

707

708

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

709

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

710

-Wunreachable-code*/

756

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

757

if(IN6_IS_ADDR_LINKLOCAL

758

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

711

759

if(if_index == AVAHI_IF_UNSPEC){

712

760

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

713

761

" incomplete without a network interface\n");

715

763

goto mandos_end;

716

764

}

717

765

/* Set the network interface number as scope */

718

to.in6.sin6_scope_id = (uint32_t)if_index;

766

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

719

767

}

720

768

} else {

721

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

722

-Wconversion and

723

-Wunreachable-code */

769

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

724

770

}

725

771

726

772

if(quit_now){

734

780

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

735

781

perror_plus("if_indextoname");

736

782

} else {

737

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

738

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

783

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

784

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

739

785

}

740

786

} else {

741

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

742

ip, port);

787

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

788

ip, (uintmax_t)port);

743

789

}

744

790

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

745

791

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

746

const char *pcret;

747

792

if(af == AF_INET6){

748

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

749

sizeof(addrstr));

793

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

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

750

797

} else {

751

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

752

sizeof(addrstr));

798

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

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

753

802

}

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

}

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);

760

809

}

761

810

}

762

811

766

815

}

767

816

768

817

if(af == AF_INET6){

769

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

818

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

819

sizeof(struct sockaddr_in6));

770

820

} else {

771

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

821

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

822

sizeof(struct sockaddr_in));

772

823

}

773

824

if(ret < 0){

774

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

825

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

775

826

int e = errno;

776

827

perror_plus("connect");

777

828

errno = e;

938

989

if(buffer_length > 0){

939

990

ssize_t decrypted_buffer_size;

940

991

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

941

&decrypted_buffer);

992

&decrypted_buffer, mc);

942

993

if(decrypted_buffer_size >= 0){

943

994

944

995

written = 0;

992

1043

return retval;

993

1044

}

994

1045

1046

__attribute__((nonnull))

995

1047

static void resolve_callback(AvahiSServiceResolver *r,

996

1048

AvahiIfIndex interface,

997

1049

AvahiProtocol proto,

1005

1057

AVAHI_GCC_UNUSED AvahiStringList *txt,

1006

1058

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1007

1059

flags,

1008

AVAHI_GCC_UNUSED void* userdata){

1009

assert(r);

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

1010

1064

1011

1065

/* Called whenever a service has been resolved successfully or

1012

1066

timed out */

1021

1075

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

1022

1076

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

1023

1077

domain,

1024

avahi_strerror(avahi_server_errno(mc.server)));

1078

avahi_strerror(avahi_server_errno

1079

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

1025

1080

break;

1026

1081

1027

1082

case AVAHI_RESOLVER_FOUND:

1033

1088

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

1034

1089

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

1035

1090

}

1036

int ret = start_mandos_communication(ip, port, interface,

1037

avahi_proto_to_af(proto));

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

1038

1095

if(ret == 0){

1039

avahi_simple_poll_quit(mc.simple_poll);

1096

avahi_simple_poll_quit(simple_poll);

1040

1097

} else {

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1098

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

1099

avahi_proto_to_af(proto),

1100

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

1043

1101

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

1044

1102

" list\n", name);

1045

1103

}

1058

1116

const char *domain,

1059

1117

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1060

1118

flags,

1061

AVAHI_GCC_UNUSED void* userdata){

1062

assert(b);

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

1063

1123

1064

1124

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

1065

1125

is removed from the LAN */

1073

1133

case AVAHI_BROWSER_FAILURE:

1074

1134

1075

1135

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

1076

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_simple_poll_quit(mc.simple_poll);

1136

avahi_strerror(avahi_server_errno

1137

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

1138

avahi_simple_poll_quit(simple_poll);

1078

1139

return;

1079

1140

1080

1141

case AVAHI_BROWSER_NEW:

1083

1144

the callback function is called the Avahi server will free the

1084

1145

resolver for us. */

1085

1146

1086

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

1087

name, type, domain, protocol, 0,

1088

resolve_callback, NULL) == NULL)

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)

1089

1151

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

1090

1152

" %s\n", name,

1091

avahi_strerror(avahi_server_errno(mc.server)));

1153

avahi_strerror(avahi_server_errno

1154

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

1092

1155

break;

1093

1156

1094

1157

case AVAHI_BROWSER_REMOVE:

1113

1176

signal_received = sig;

1114

1177

int old_errno = errno;

1115

1178

/* set main loop to exit */

1116

if(mc.simple_poll != NULL){

1117

avahi_simple_poll_quit(mc.simple_poll);

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1118

1181

}

1119

1182

errno = old_errno;

1120

1183

}

1121

1184

1185

__attribute__((nonnull, warn_unused_result))

1122

1186

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

1123

1187

int ret;

1188

error_t ret_errno;

1124

1189

1125

1190

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

1126

1191

if(s < 0){

1192

ret_errno = errno;

1127

1193

perror_plus("socket");

1194

errno = ret_errno;

1128

1195

return false;

1129

1196

}

1130

1197

strcpy(ifr->ifr_name, ifname);

1131

1198

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1132

1199

if(ret == -1){

1133

1200

if(debug){

1201

ret_errno = errno;

1134

1202

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1135

1204

}

1136

1205

return false;

1137

1206

}

1138

1207

return true;

1139

1208

}

1140

1209

1210

__attribute__((nonnull, warn_unused_result))

1141

1211

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

1142

1212

1143

1213

/* Reject the loopback device */

1185

1255

* corresponds to an acceptable network device.

1186

1256

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

1187

1257

*/

1258

__attribute__((nonnull, warn_unused_result))

1188

1259

int good_interface(const struct dirent *if_entry){

1189

1260

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

1190

1261

return 0;

1206

1277

}

1207

1278

1208

1279

/*

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

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))

1251

1314

int notdotentries(const struct dirent *direntry){

1252

1315

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

1253

1316

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

1260

1323

}

1261

1324

1262

1325

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

1326

__attribute__((nonnull, warn_unused_result))

1263

1327

int runnable_hook(const struct dirent *direntry){

1264

1328

int ret;

1265

1329

size_t sret;

1273

1337

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

1274

1338

"abcdefghijklmnopqrstuvwxyz"

1275

1339

"0123456789"

1276

"_-");

1340

"_.-");

1277

1341

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

1278

1342

/* Contains non-allowed characters */

1279

1343

if(debug){

1283

1347

return 0;

1284

1348

}

1285

1349

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);

1350

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

1294

1351

if(ret == -1){

1295

1352

if(debug){

1296

1353

perror_plus("Could not stat hook");

1320

1377

return 1;

1321

1378

}

1322

1379

1323

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1324

1383

int ret;

1325

1384

struct timespec now;

1326

1385

struct timespec waited_time;

1327

1386

intmax_t block_time;

1328

1387

1329

1388

while(true){

1330

if(mc.current_server == NULL){

1331

if (debug){

1389

if(mc->current_server == NULL){

1390

if(debug){

1332

1391

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

1333

1392

" No timeout!\n");

1334

1393

}

1335

1394

ret = avahi_simple_poll_iterate(s, -1);

1336

1395

} else {

1337

if (debug){

1396

if(debug){

1338

1397

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

1339

1398

" it, or wait\n");

1340

1399

}

1347

1406

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

1348

1407

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

1349

1408

waited_time.tv_sec = (now.tv_sec

1350

- mc.current_server->last_seen.tv_sec);

1409

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

1351

1410

waited_time.tv_nsec = (now.tv_nsec

1352

- mc.current_server->last_seen.tv_nsec);

1411

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

1353

1412

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

1354

1413

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

1355

1414

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

1357

1416

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

1358

1417

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

1359

1418

1360

if (debug){

1419

if(debug){

1361

1420

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

1362

1421

block_time);

1363

1422

}

1364

1423

1365

1424

if(block_time <= 0){

1366

ret = start_mandos_communication(mc.current_server->ip,

1367

mc.current_server->port,

1368

mc.current_server->if_index,

1369

mc.current_server->af);

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);

1370

1429

if(ret == 0){

1371

avahi_simple_poll_quit(mc.simple_poll);

1430

avahi_simple_poll_quit(s);

1372

1431

return 0;

1373

1432

}

1374

1433

ret = clock_gettime(CLOCK_MONOTONIC,

1375

&mc.current_server->last_seen);

1434

&mc->current_server->last_seen);

1376

1435

if(ret == -1){

1377

1436

perror_plus("clock_gettime");

1378

1437

return -1;

1379

1438

}

1380

mc.current_server = mc.current_server->next;

1439

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

1381

1440

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

1382

1441

servers, but don't block */

1383

1442

}

1385

1444

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

1386

1445

}

1387

1446

if(ret != 0){

1388

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

1447

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

1389

1448

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

1390

1449

}

1391

1450

}

1393

1452

}

1394

1453

1395

1454

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

1455

__attribute__((warn_unused_result))

1396

1456

error_t raise_privileges(void){

1397

1457

error_t old_errno = errno;

1398

1458

error_t ret_errno = 0;

1399

1459

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

1400

1460

ret_errno = errno;

1401

perror_plus("seteuid");

1402

1461

}

1403

1462

errno = old_errno;

1404

1463

return ret_errno;

1405

1464

}

1406

1465

1407

1466

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

1467

__attribute__((warn_unused_result))

1408

1468

error_t raise_privileges_permanently(void){

1409

1469

error_t old_errno = errno;

1410

1470

error_t ret_errno = raise_privileges();

1414

1474

}

1415

1475

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

1416

1476

ret_errno = errno;

1417

perror_plus("seteuid");

1418

1477

}

1419

1478

errno = old_errno;

1420

1479

return ret_errno;

1421

1480

}

1422

1481

1423

1482

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

1483

__attribute__((warn_unused_result))

1424

1484

error_t lower_privileges(void){

1425

1485

error_t old_errno = errno;

1426

1486

error_t ret_errno = 0;

1427

1487

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

1428

1488

ret_errno = errno;

1429

perror_plus("seteuid");

1430

}

1431

errno = old_errno;

1432

return ret_errno;

1433

}

1434

1435

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

1489

}

1490

errno = old_errno;

1491

return ret_errno;

1492

}

1493

1494

/* Lower privileges permanently */

1495

__attribute__((warn_unused_result))

1496

error_t lower_privileges_permanently(void){

1497

error_t old_errno = errno;

1498

error_t ret_errno = 0;

1499

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

1500

ret_errno = errno;

1501

}

1502

errno = old_errno;

1503

return ret_errno;

1504

}

1505

1506

__attribute__((nonnull))

1507

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

1436

1508

const float delay){

1437

struct dirent **direntries;

1438

struct dirent *direntry;

1439

int ret;

1440

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

1441

alphasort);

1509

struct dirent **direntries = NULL;

1510

if(hookdir_fd == -1){

1511

hookdir_fd = open(hookdir, O_RDONLY);

1512

if(hookdir_fd == -1){

1513

if(errno == ENOENT){

1514

if(debug){

1515

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

1516

" found\n", hookdir);

1517

}

1518

} else {

1519

perror_plus("open");

1520

}

1521

return;

1522

}

1523

}

1524

#ifdef __GLIBC__

1525

#if __GLIBC_PREREQ(2, 15)

1526

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

1527

runnable_hook, alphasort);

1528

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

1529

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

1530

alphasort);

1531

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

1532

#else /* not __GLIBC__ */

1533

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

1534

alphasort);

1535

#endif /* not __GLIBC__ */

1442

1536

if(numhooks == -1){

1443

1537

perror_plus("scandir");

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){

1538

return;

1539

}

1540

struct dirent *direntry;

1541

int ret;

1542

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

1543

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

1544

direntry = direntries[i];

1545

if(debug){

1546

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

1547

direntry->d_name);

1548

}

1549

pid_t hook_pid = fork();

1550

if(hook_pid == 0){

1551

/* Child */

1552

/* Raise privileges */

1553

errno = raise_privileges_permanently();

1554

if(errno != 0){

1555

perror_plus("Failed to raise privileges");

1556

_exit(EX_NOPERM);

1557

}

1558

/* Set group */

1559

errno = 0;

1560

ret = setgid(0);

1561

if(ret == -1){

1562

perror_plus("setgid");

1563

_exit(EX_NOPERM);

1564

}

1565

/* Reset supplementary groups */

1566

errno = 0;

1567

ret = setgroups(0, NULL);

1568

if(ret == -1){

1569

perror_plus("setgroups");

1570

_exit(EX_NOPERM);

1571

}

1572

ret = dup2(devnull, STDIN_FILENO);

1573

if(ret == -1){

1574

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

1575

_exit(EX_OSERR);

1576

}

1577

ret = close(devnull);

1578

if(ret == -1){

1579

perror_plus("close");

1580

_exit(EX_OSERR);

1581

}

1582

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1583

if(ret == -1){

1584

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

1585

_exit(EX_OSERR);

1586

}

1587

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

1588

if(ret == -1){

1589

perror_plus("setenv");

1590

_exit(EX_OSERR);

1591

}

1592

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

1593

if(ret == -1){

1594

perror_plus("setenv");

1595

_exit(EX_OSERR);

1596

}

1597

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

1598

if(ret == -1){

1599

perror_plus("setenv");

1600

_exit(EX_OSERR);

1601

}

1602

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

1603

if(ret == -1){

1604

perror_plus("setenv");

1605

_exit(EX_OSERR);

1606

}

1607

char *delaystring;

1608

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

1609

if(ret == -1){

1451

1610

perror_plus("asprintf");

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

}

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1510

1615

free(delaystring);

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

}

1616

perror_plus("setenv");

1617

_exit(EX_OSERR);

1618

}

1619

free(delaystring);

1620

if(connect_to != NULL){

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

_exit(EX_OSERR);

1625

}

1626

}

1627

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

1628

if(hook_fd == -1){

1629

perror_plus("openat");

1630

_exit(EXIT_FAILURE);

1631

}

1632

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

1633

perror_plus("close");

1634

_exit(EXIT_FAILURE);

1635

}

1636

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

1637

environ) == -1){

1638

perror_plus("fexecve");

1639

_exit(EXIT_FAILURE);

1640

}

1641

} else {

1642

int status;

1643

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

1644

perror_plus("waitpid");

1645

continue;

1646

}

1647

if(WIFEXITED(status)){

1648

if(WEXITSTATUS(status) != 0){

1649

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

1650

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

1651

WEXITSTATUS(status));

1652

continue;

1653

}

1654

} else if(WIFSIGNALED(status)){

1655

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

1656

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

1657

WTERMSIG(status));

1658

continue;

1522

1659

} else {

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;

1660

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

1661

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

1662

continue;

1663

}

1664

}

1665

if(debug){

1666

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

1667

direntry->d_name);

1668

}

1669

}

1670

free(direntries);

1671

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

1672

perror_plus("close");

1673

} else {

1674

hookdir_fd = -1;

1675

}

1676

close(devnull);

1559

1677

}

1560

1678

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;

1679

__attribute__((nonnull, warn_unused_result))

1680

error_t bring_up_interface(const char *const interface,

1681

const float delay){

1682

error_t old_errno = errno;

1566

1683

int ret;

1567

1684

struct ifreq network;

1568

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1685

unsigned int if_index = if_nametoindex(interface);

1569

1686

if(if_index == 0){

1570

1687

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

1571

1688

errno = old_errno;

1577

1694

return EINTR;

1578

1695

}

1579

1696

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);

1697

if(not interface_is_up(interface)){

1698

error_t ret_errno = 0, ioctl_errno = 0;

1699

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

1700

ret_errno = errno;

1701

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

1702

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

1703

errno = old_errno;

1704

return ret_errno;

1705

}

1706

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

1707

1708

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

1709

if(sd == -1){

1710

ret_errno = errno;

1711

perror_plus("socket");

1712

errno = old_errno;

1713

return ret_errno;

1714

}

1715

1716

if(quit_now){

1717

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

1718

if(ret == -1){

1719

perror_plus("close");

1720

}

1721

errno = old_errno;

1722

return EINTR;

1723

}

1724

1725

if(debug){

1726

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

1727

interface);

1728

}

1729

1730

/* Raise privileges */

1731

ret_errno = raise_privileges();

1732

if(ret_errno != 0){

1733

errno = ret_errno;

1734

perror_plus("Failed to raise privileges");

1735

}

1736

1737

#ifdef __linux__

1738

int ret_linux;

1739

bool restore_loglevel = false;

1740

if(ret_errno == 0){

1741

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1742

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

1743

ret_linux = klogctl(8, NULL, 5);

1744

if(ret_linux == -1){

1745

perror_plus("klogctl");

1746

} else {

1747

restore_loglevel = true;

1748

}

1749

}

1750

#endif /* __linux__ */

1751

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

1752

ioctl_errno = errno;

1753

#ifdef __linux__

1754

if(restore_loglevel){

1755

ret_linux = klogctl(7, NULL, 0);

1756

if(ret_linux == -1){

1757

perror_plus("klogctl");

1758

}

1759

}

1760

#endif /* __linux__ */

1761

1762

/* If raise_privileges() succeeded above */

1763

if(ret_errno == 0){

1764

/* Lower privileges */

1765

ret_errno = lower_privileges();

1766

if(ret_errno != 0){

1767

errno = ret_errno;

1768

perror_plus("Failed to lower privileges");

1769

}

1770

}

1771

1772

/* Close the socket */

1773

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

1632

1774

if(ret == -1){

1633

ret_errno = errno;

1775

perror_plus("close");

1776

}

1777

1778

if(ret_setflags == -1){

1779

errno = ioctl_errno;

1634

1780

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();

1645

1781

errno = old_errno;

1646

return ret_errno;

1782

return ioctl_errno;

1647

1783

}

1784

} else if(debug){

1785

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

1786

interface);

1648

1787

}

1788

1649

1789

/* Sleep checking until interface is running.

1650

1790

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

1651

1791

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

1652

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

1653

if(ret == -1){

1654

perror_plus("ioctl SIOCGIFFLAGS");

1655

} else if(network.ifr_flags & IFF_RUNNING){

1792

if(interface_is_running(interface)){

1656

1793

break;

1657

1794

}

1658

1795

struct timespec sleeptime = { .tv_nsec = 250000000 };

1661

1798

perror_plus("nanosleep");

1662

1799

}

1663

1800

}

1664

/* Close the socket */

1665

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

1666

if(ret == -1){

1667

perror_plus("close");

1801

1802

errno = old_errno;

1803

return 0;

1804

}

1805

1806

__attribute__((nonnull, warn_unused_result))

1807

error_t take_down_interface(const char *const interface){

1808

error_t old_errno = errno;

1809

struct ifreq network;

1810

unsigned int if_index = if_nametoindex(interface);

1811

if(if_index == 0){

1812

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

1813

errno = old_errno;

1814

return ENXIO;

1668

1815

}

1669

#ifdef __linux__

1670

if(restore_loglevel){

1671

/* Restores kernel loglevel to default */

1672

ret = klogctl(7, NULL, 0);

1816

if(interface_is_up(interface)){

1817

error_t ret_errno = 0, ioctl_errno = 0;

1818

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

1819

ret_errno = errno;

1820

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

1821

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

1822

errno = old_errno;

1823

return ret_errno;

1824

}

1825

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

1826

1827

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

1828

if(sd == -1){

1829

ret_errno = errno;

1830

perror_plus("socket");

1831

errno = old_errno;

1832

return ret_errno;

1833

}

1834

1835

if(debug){

1836

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

1837

interface);

1838

}

1839

1840

/* Raise privileges */

1841

ret_errno = raise_privileges();

1842

if(ret_errno != 0){

1843

errno = ret_errno;

1844

perror_plus("Failed to raise privileges");

1845

}

1846

1847

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

1848

ioctl_errno = errno;

1849

1850

/* If raise_privileges() succeeded above */

1851

if(ret_errno == 0){

1852

/* Lower privileges */

1853

ret_errno = lower_privileges();

1854

if(ret_errno != 0){

1855

errno = ret_errno;

1856

perror_plus("Failed to lower privileges");

1857

}

1858

}

1859

1860

/* Close the socket */

1861

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

1673

1862

if(ret == -1){

1674

perror_plus("klogctl");

1675

}

1863

perror_plus("close");

1864

}

1865

1866

if(ret_setflags == -1){

1867

errno = ioctl_errno;

1868

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1869

errno = old_errno;

1870

return ioctl_errno;

1871

}

1872

} else if(debug){

1873

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

1874

interface);

1676

1875

}

1677

#endif /* __linux__ */

1678

/* Lower privileges */

1679

lower_privileges();

1876

1680

1877

errno = old_errno;

1681

1878

return 0;

1682

1879

}

1683

1880

1684

1881

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

1882

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

1883

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

1884

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

1885

.interfaces = NULL, .interfaces_size = 0 };

1685

1886

AvahiSServiceBrowser *sb = NULL;

1686

int error;

1887

error_t ret_errno;

1687

1888

int ret;

1688

1889

intmax_t tmpmax;

1689

1890

char *tmp;

1690

1891

int exitcode = EXIT_SUCCESS;

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;

1892

char *interfaces_to_take_down = NULL;

1893

size_t interfaces_to_take_down_size = 0;

1894

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

1895

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

1896

char *tempdir = NULL;

1697

1897

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1698

1898

const char *seckey = PATHDIR "/" SECKEY;

1699

1899

const char *pubkey = PATHDIR "/" PUBKEY;

1900

char *interfaces_hooks = NULL;

1700

1901

1701

1902

bool gnutls_initialized = false;

1702

1903

bool gpgme_initialized = false;

1793

1994

connect_to = arg;

1794

1995

break;

1795

1996

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

1796

interface = arg;

1997

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

1998

arg, (int)',');

1999

if(ret_errno != 0){

2000

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

2001

}

1797

2002

break;

1798

2003

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

1799

2004

seckey = arg;

1876

2081

/* Work around Debian bug #633582:

1877

2082

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

1878

2083

1879

/* Re-raise priviliges */

1880

if(raise_privileges() == 0){

2084

/* Re-raise privileges */

2085

ret_errno = raise_privileges();

2086

if(ret_errno != 0){

2087

errno = ret_errno;

2088

perror_plus("Failed to raise privileges");

2089

} else {

1881

2090

struct stat st;

1882

2091

1883

2092

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

1923

2132

}

1924

2133

1925

2134

/* Lower privileges */

1926

errno = 0;

1927

ret = seteuid(uid);

1928

if(ret == -1){

1929

perror_plus("seteuid");

2135

ret_errno = lower_privileges();

2136

if(ret_errno != 0){

2137

errno = ret_errno;

2138

perror_plus("Failed to lower privileges");

2139

}

2140

}

2141

}

2142

2143

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

2144

{

2145

char *interface = NULL;

2146

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

2147

interface))){

2148

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

2149

and if_nametoindex(interface) == 0){

2150

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

2151

fprintf_plus(stderr, "Not using nonexisting interface"

2152

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

2153

}

2154

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

2155

interface = NULL;

1930

2156

}

1931

2157

}

1932

2158

}

1933

2159

1934

2160

/* Run network hooks */

1935

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

1936

goto end;

2161

{

2162

if(mc.interfaces != NULL){

2163

interfaces_hooks = malloc(mc.interfaces_size);

2164

if(interfaces_hooks == NULL){

2165

perror_plus("malloc");

2166

goto end;

2167

}

2168

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

2169

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

2170

}

2171

run_network_hooks("start", interfaces_hooks != NULL ?

2172

interfaces_hooks : "", delay);

1937

2173

}

1938

2174

1939

2175

if(not debug){

1940

2176

avahi_set_log_function(empty_log);

1941

2177

}

1942

2178

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){

1961

perror_plus("malloc");

1962

free(direntries);

1963

exitcode = EXIT_FAILURE;

1964

goto end;

1965

}

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;

1972

}

1973

}

1974

1975

2179

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

1976

2180

from the signal handler */

1977

2181

/* Initialize the pseudo-RNG for Avahi */

1978

2182

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

1979

mc.simple_poll = avahi_simple_poll_new();

1980

if(mc.simple_poll == NULL){

2183

simple_poll = avahi_simple_poll_new();

2184

if(simple_poll == NULL){

1981

2185

fprintf_plus(stderr,

1982

2186

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

1983

2187

exitcode = EX_UNAVAILABLE;

2047

2251

}

2048

2252

}

2049

2253

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

}

2254

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

2255

if(mc.interfaces == NULL){

2256

struct dirent **direntries = NULL;

2257

/* Look for any good interfaces */

2258

ret = scandir(sys_class_net, &direntries, good_interface,

2259

alphasort);

2260

if(ret >= 1){

2261

/* Add all found interfaces to interfaces list */

2262

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

2263

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

2264

direntries[i]->d_name);

2265

if(ret_errno != 0){

2266

errno = ret_errno;

2267

perror_plus("argz_add");

2268

continue;

2269

}

2270

if(debug){

2271

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

2272

direntries[i]->d_name);

2273

}

2274

}

2275

free(direntries);

2276

} else {

2277

if(ret == 0){

2278

free(direntries);

2279

}

2280

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

2281

exitcode = EXIT_FAILURE;

2282

goto end;

2283

}

2284

}

2285

2286

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

2287

{

2288

char *interface = NULL;

2289

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

2290

interface))){

2291

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

2292

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

2293

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

2294

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

2295

interface);

2296

interface = NULL;

2297

while((interface = argz_next(mc.interfaces,

2298

mc.interfaces_size, interface))){

2299

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

2300

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

2301

interface);

2302

interface = NULL;

2303

}

2304

}

2305

break;

2306

}

2307

bool interface_was_up = interface_is_up(interface);

2308

errno = bring_up_interface(interface, delay);

2309

if(not interface_was_up){

2310

if(errno != 0){

2311

perror_plus("Failed to bring up interface");

2312

} else {

2313

errno = argz_add(&interfaces_to_take_down,

2314

&interfaces_to_take_down_size,

2315

interface);

2316

if(errno != 0){

2317

perror_plus("argz_add");

2318

}

2319

}

2320

}

2321

}

2322

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

2323

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

2324

}

2325

}

2326

2327

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

2328

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

2329

if(debug){

2330

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

2331

mc.interfaces);

2332

}

2333

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

2057

2334

}

2058

2335

2059

2336

if(quit_now){

2060

2337

goto end;

2061

2338

}

2062

2339

2063

ret = init_gnutls_global(pubkey, seckey);

2340

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

2064

2341

if(ret == -1){

2065

2342

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

2066

2343

exitcode = EX_UNAVAILABLE;

2073

2350

goto end;

2074

2351

}

2075

2352

2076

if(mkdtemp(tempdir) == NULL){

2353

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

2354

tempdir = mkdtemp(run_tempdir);

2355

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

2356

if(debug){

2357

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

2358

run_tempdir, old_tempdir);

2359

}

2360

tempdir = mkdtemp(old_tempdir);

2361

}

2362

if(tempdir == NULL){

2077

2363

perror_plus("mkdtemp");

2078

2364

goto end;

2079

2365

}

2080

tempdir_created = true;

2081

2366

2082

2367

if(quit_now){

2083

2368

goto end;

2084

2369

}

2085

2370

2086

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

2371

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

2087

2372

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

2088

2373

exitcode = EX_UNAVAILABLE;

2089

2374

goto end;

2110

2395

goto end;

2111

2396

}

2112

2397

2113

uint16_t port;

2398

in_port_t port;

2114

2399

errno = 0;

2115

2400

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

2116

2401

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

2117

or tmpmax != (uint16_t)tmpmax){

2402

or tmpmax != (in_port_t)tmpmax){

2118

2403

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

2119

2404

exitcode = EX_USAGE;

2120

2405

goto end;

2121

2406

}

2122

2407

2123

2408

if(quit_now){

2124

2409

goto end;

2125

2410

}

2126

2411

2127

port = (uint16_t)tmpmax;

2412

port = (in_port_t)tmpmax;

2128

2413

*address = '\0';

2129

2414

/* Colon in address indicates IPv6 */

2130

2415

int af;

2146

2431

}

2147

2432

2148

2433

while(not quit_now){

2149

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

2434

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

2435

&mc);

2150

2436

if(quit_now or ret == 0){

2151

2437

break;

2152

2438

}

2154

2440

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

2155

2441

(int)retry_interval);

2156

2442

}

2157

sleep((int)retry_interval);

2443

sleep((unsigned int)retry_interval);

2158

2444

}

2159

2445

2160

if (not quit_now){

2446

if(not quit_now){

2161

2447

exitcode = EXIT_SUCCESS;

2162

2448

}

2163

2449

2178

2464

config.publish_domain = 0;

2179

2465

2180

2466

/* Allocate a new server */

2181

mc.server = avahi_server_new(avahi_simple_poll_get

2182

(mc.simple_poll), &config, NULL,

2183

NULL, &error);

2467

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2468

&config, NULL, NULL, &ret_errno);

2184

2469

2185

2470

/* Free the Avahi configuration data */

2186

2471

avahi_server_config_free(&config);

2189

2474

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

2190

2475

if(mc.server == NULL){

2191

2476

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

2192

avahi_strerror(error));

2477

avahi_strerror(ret_errno));

2193

2478

exitcode = EX_UNAVAILABLE;

2194

2479

goto end;

2195

2480

}

2201

2486

/* Create the Avahi service browser */

2202

2487

sb = avahi_s_service_browser_new(mc.server, if_index,

2203

2488

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2204

NULL, 0, browse_callback, NULL);

2489

NULL, 0, browse_callback,

2490

(void *)&mc);

2205

2491

if(sb == NULL){

2206

2492

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

2207

2493

avahi_strerror(avahi_server_errno(mc.server)));

2218

2504

if(debug){

2219

2505

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

2220

2506

}

2221

2222

ret = avahi_loop_with_timeout(mc.simple_poll,

2223

(int)(retry_interval * 1000));

2507

2508

ret = avahi_loop_with_timeout(simple_poll,

2509

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

2224

2510

if(debug){

2225

2511

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

2226

2512

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

2233

2519

}

2234

2520

2235

2521

/* Cleanup things */

2522

free(mc.interfaces);

2523

2236

2524

if(sb != NULL)

2237

2525

avahi_s_service_browser_free(sb);

2238

2526

2239

2527

if(mc.server != NULL)

2240

2528

avahi_server_free(mc.server);

2241

2529

2242

if(mc.simple_poll != NULL)

2243

avahi_simple_poll_free(mc.simple_poll);

2530

if(simple_poll != NULL)

2531

avahi_simple_poll_free(simple_poll);

2244

2532

2245

2533

if(gnutls_initialized){

2246

2534

gnutls_certificate_free_credentials(mc.cred);

2263

2551

}

2264

2552

}

2265

2553

2266

/* Run network hooks */

2267

run_network_hooks("stop", interface, delay);

2268

2269

/* Re-raise priviliges */

2554

/* Re-raise privileges */

2270

2555

{

2271

raise_privileges();

2556

ret_errno = raise_privileges();

2557

if(ret_errno != 0){

2558

errno = ret_errno;

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

}

2272

2584

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

}

2585

ret_errno = lower_privileges_permanently();

2586

if(ret_errno != 0){

2587

errno = ret_errno;

2588

perror_plus("Failed to lower privileges permanently");

2289

2589

}

2290

2590

}

2291

/* Lower privileges permanently */

2292

errno = 0;

2293

ret = setuid(uid);

2294

if(ret == -1){

2295

perror_plus("setuid");

2296

}

2591

2592

free(interfaces_to_take_down);

2593

free(interfaces_hooks);

2297

2594

2298

2595

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

2299

if(tempdir_created){

2596

if(tempdir != NULL){

2300

2597

struct dirent **direntries = NULL;

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);

2598

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

2599

O_NOFOLLOW));

2600

if(tempdir_fd == -1){

2601

perror_plus("open");

2602

} else {

2603

#ifdef __GLIBC__

2604

#if __GLIBC_PREREQ(2, 15)

2605

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

2606

notdotentries, alphasort);

2607

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

2608

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

2609

alphasort);

2610

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

2611

#else /* not __GLIBC__ */

2612

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

2613

alphasort);

2614

#endif /* not __GLIBC__ */

2615

if(numentries >= 0){

2616

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

2617

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

2618

if(ret == -1){

2619

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

2620

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

2621

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

2622

}

2623

}

2624

2625

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

2626

free(direntries);

2627

if(numentries == -1){

2628

perror_plus("scandir");

2629

}

2630

ret = rmdir(tempdir);

2631

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

2632

perror_plus("rmdir");

2633

}

2320

2634

}

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

TEMP_FAILURE_RETRY(close(tempdir_fd));

2331

2636

}

2332

2637

}

2333

2638