/mandos/trunk : revision 595

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() */

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inet_pton(), connect() */

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

61

60

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

62

61

*/

63

62

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

64

63

strtoimax() */

64

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

65

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

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program_invocation_short_name */

67

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

73

*/

74

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

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

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

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unlinkat() */

78

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

76

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

77

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

79

78

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

80

79

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

81

80

argp_state, struct argp,

89

88

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

90

89

WEXITSTATUS(), WTERMSIG() */

91

90

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

92

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

93

argz_delete(), argz_append(),

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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

uid_t uid = 65534;

147

gid_t gid = 65534;

148

138

149

139

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

150

140

typedef struct server{

151

141

const char *ip;

152

in_port_t port;

142

uint16_t port;

153

143

AvahiIfIndex if_index;

154

144

int af;

155

145

struct timespec last_seen;

159

149

160

150

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

161

151

typedef struct {

152

AvahiSimplePoll *simple_poll;

162

153

AvahiServer *server;

163

154

gnutls_certificate_credentials_t cred;

164

155

unsigned int dh_bits;

166

157

const char *priority;

167

158

gpgme_ctx_t ctx;

168

159

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

160

} mandos_context;

172

161

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

162

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

163

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

164

.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

175

167

176

168

sig_atomic_t quit_now = 0;

177

169

int signal_received = 0;

185

177

perror(print_text);

186

178

}

187

179

188

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

180

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

189

181

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

190

182

va_list ap;

191

183

va_start (ap, format);

192

184

193

185

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

194

186

program_invocation_short_name));

195

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

187

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

196

188

}

197

189

198

190

/*

200

192

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

201

193

* "buffer_length" is how much is already used.

202

194

*/

203

__attribute__((nonnull, warn_unused_result))

204

195

size_t incbuffer(char **buffer, size_t buffer_length,

205

196

size_t buffer_capacity){

206

197

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;

198

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

199

if(buffer == NULL){

213

200

return 0;

214

201

}

215

*buffer = new_buf;

216

202

buffer_capacity += BUFFER_SIZE;

217

203

}

218

204

return buffer_capacity;

219

205

}

220

206

221

207

/* 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){

208

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

209

int af){

225

210

int ret;

226

211

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

227

212

if(new_server == NULL){

234

219

.af = af };

235

220

if(new_server->ip == NULL){

236

221

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

free(new_server->ip);

244

free(new_server);

245

222

return false;

246

223

}

247

224

/* Special case of first server */

248

if(*current_server == NULL){

225

if (mc.current_server == NULL){

249

226

new_server->next = new_server;

250

227

new_server->prev = new_server;

251

*current_server = new_server;

228

mc.current_server = new_server;

229

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

252

230

} else {

253

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

254

new_server->next = *current_server;

255

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

231

new_server->next = mc.current_server;

232

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

256

233

new_server->prev->next = new_server;

257

(*current_server)->prev = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

258

240

}

259

241

return true;

260

242

}

262

244

/*

263

245

* Initialize GPGME.

264

246

*/

265

__attribute__((nonnull, warn_unused_result))

266

static bool init_gpgme(const char * const seckey,

267

const char * const pubkey,

268

const char * const tempdir,

269

mandos_context *mc){

247

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

248

const char *tempdir){

270

249

gpgme_error_t rc;

271

250

gpgme_engine_info_t engine_info;

272

251

252

273

253

/*

274

254

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

275

255

*/

276

bool import_key(const char * const filename){

256

bool import_key(const char *filename){

277

257

int ret;

278

258

int fd;

279

259

gpgme_data_t pgp_data;

291

271

return false;

292

272

}

293

273

294

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

274

rc = gpgme_op_import(mc.ctx, pgp_data);

295

275

if(rc != GPG_ERR_NO_ERROR){

296

276

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

297

277

gpgme_strsource(rc), gpgme_strerror(rc));

341

321

}

342

322

343

323

/* Create new GPGME "context" */

344

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

324

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

345

325

if(rc != GPG_ERR_NO_ERROR){

346

326

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

347

327

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

360

340

* Decrypt OpenPGP data.

361

341

* Returns -1 on error

362

342

*/

363

__attribute__((nonnull, warn_unused_result))

364

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

365

344

size_t crypto_size,

366

char **plaintext,

367

mandos_context *mc){

345

char **plaintext){

368

346

gpgme_data_t dh_crypto, dh_plain;

369

347

gpgme_error_t rc;

370

348

ssize_t ret;

396

374

397

375

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

398

376

data buffer */

399

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

377

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

400

378

if(rc != GPG_ERR_NO_ERROR){

401

379

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

402

380

gpgme_strsource(rc), gpgme_strerror(rc));

403

381

plaintext_length = -1;

404

382

if(debug){

405

383

gpgme_decrypt_result_t result;

406

result = gpgme_op_decrypt_result(mc->ctx);

384

result = gpgme_op_decrypt_result(mc.ctx);

407

385

if(result == NULL){

408

386

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

409

387

} else {

486

464

return plaintext_length;

487

465

}

488

466

489

__attribute__((warn_unused_result))

490

static const char *safer_gnutls_strerror(int value){

491

const char *ret = gnutls_strerror(value);

467

static const char * safer_gnutls_strerror(int value){

468

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

469

-Wunreachable-code */

492

470

if(ret == NULL)

493

471

ret = "(unknown)";

494

472

return ret;

495

473

}

496

474

497

475

/* GnuTLS log function callback */

498

__attribute__((nonnull))

499

476

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

500

477

const char* string){

501

478

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

502

479

}

503

480

504

__attribute__((nonnull, warn_unused_result))

505

481

static int init_gnutls_global(const char *pubkeyfilename,

506

const char *seckeyfilename,

507

mandos_context *mc){

482

const char *seckeyfilename){

508

483

int ret;

509

484

510

485

if(debug){

527

502

}

528

503

529

504

/* OpenPGP credentials */

530

ret = gnutls_certificate_allocate_credentials(&mc->cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

531

506

if(ret != GNUTLS_E_SUCCESS){

532

507

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

533

508

safer_gnutls_strerror(ret));

543

518

}

544

519

545

520

ret = gnutls_certificate_set_openpgp_key_file

546

(mc->cred, pubkeyfilename, seckeyfilename,

521

(mc.cred, pubkeyfilename, seckeyfilename,

547

522

GNUTLS_OPENPGP_FMT_BASE64);

548

523

if(ret != GNUTLS_E_SUCCESS){

549

524

fprintf_plus(stderr,

555

530

}

556

531

557

532

/* GnuTLS server initialization */

558

ret = gnutls_dh_params_init(&mc->dh_params);

533

ret = gnutls_dh_params_init(&mc.dh_params);

559

534

if(ret != GNUTLS_E_SUCCESS){

560

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

561

536

" initialization: %s\n",

562

537

safer_gnutls_strerror(ret));

563

538

goto globalfail;

564

539

}

565

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

540

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

566

541

if(ret != GNUTLS_E_SUCCESS){

567

542

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

568

543

safer_gnutls_strerror(ret));

569

544

goto globalfail;

570

545

}

571

546

572

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

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

573

548

574

549

return 0;

575

550

576

551

globalfail:

577

552

578

gnutls_certificate_free_credentials(mc->cred);

553

gnutls_certificate_free_credentials(mc.cred);

579

554

gnutls_global_deinit();

580

gnutls_dh_params_deinit(mc->dh_params);

555

gnutls_dh_params_deinit(mc.dh_params);

581

556

return -1;

582

557

}

583

558

584

__attribute__((nonnull, warn_unused_result))

585

static int init_gnutls_session(gnutls_session_t *session,

586

mandos_context *mc){

559

static int init_gnutls_session(gnutls_session_t *session){

587

560

int ret;

588

561

/* GnuTLS session creation */

589

562

do {

601

574

{

602

575

const char *err;

603

576

do {

604

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

577

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

605

578

if(quit_now){

606

579

gnutls_deinit(*session);

607

580

return -1;

618

591

619

592

do {

620

593

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

621

mc->cred);

594

mc.cred);

622

595

if(quit_now){

623

596

gnutls_deinit(*session);

624

597

return -1;

634

607

/* ignore client certificate if any. */

635

608

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

636

609

637

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

638

611

639

612

return 0;

640

613

}

644

617

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

645

618

646

619

/* Called when a Mandos server is found */

647

__attribute__((nonnull, warn_unused_result))

648

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

620

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

649

621

AvahiIfIndex if_index,

650

int af, mandos_context *mc){

622

int af){

651

623

int ret, tcp_sd = -1;

652

624

ssize_t sret;

653

struct sockaddr_storage to;

625

union {

626

struct sockaddr_in in;

627

struct sockaddr_in6 in6;

628

} to;

654

629

char *buffer = NULL;

655

630

char *decrypted_buffer = NULL;

656

631

size_t buffer_length = 0;

680

655

return -1;

681

656

}

682

657

683

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

684

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

685

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

686

bool match = false;

687

{

688

char *interface = NULL;

689

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

690

interface))){

691

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

692

match = true;

693

break;

694

}

695

}

696

}

697

if(not match){

698

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

699

connect to the server */

700

if(debug){

701

char interface[IF_NAMESIZE];

702

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

703

perror_plus("if_indextoname");

704

} else {

705

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

706

" \"%s\"\n",

707

if_indextoname((unsigned int)if_index,

708

interface));

709

}

710

}

711

return -1;

712

}

713

}

714

715

ret = init_gnutls_session(&session, mc);

658

ret = init_gnutls_session(&session);

716

659

if(ret != 0){

717

660

return -1;

718

661

}

719

662

720

663

if(debug){

721

664

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

722

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

665

PRIu16 "\n", ip, port);

723

666

}

724

667

725

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

737

680

738

681

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

739

682

if(af == AF_INET6){

740

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

741

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

683

to.in6.sin6_family = (sa_family_t)af;

684

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

742

685

} else { /* IPv4 */

743

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

744

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

686

to.in.sin_family = (sa_family_t)af;

687

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

745

688

}

746

689

if(ret < 0 ){

747

690

int e = errno;

756

699

goto mandos_end;

757

700

}

758

701

if(af == AF_INET6){

759

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

760

if(IN6_IS_ADDR_LINKLOCAL

761

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

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

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

708

-Wunreachable-code*/

762

709

if(if_index == AVAHI_IF_UNSPEC){

763

710

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

764

711

" incomplete without a network interface\n");

766

713

goto mandos_end;

767

714

}

768

715

/* Set the network interface number as scope */

769

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

716

to.in6.sin6_scope_id = (uint32_t)if_index;

770

717

}

771

718

} else {

772

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

719

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

720

-Wconversion and

721

-Wunreachable-code */

773

722

}

774

723

775

724

if(quit_now){

783

732

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

784

733

perror_plus("if_indextoname");

785

734

} else {

786

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

787

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

735

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

736

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

788

737

}

789

738

} else {

790

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

791

ip, (uintmax_t)port);

739

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

740

ip, port);

792

741

}

793

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

794

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

744

const char *pcret;

795

745

if(af == AF_INET6){

796

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

797

sizeof(struct sockaddr_in6),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

746

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

747

sizeof(addrstr));

800

748

} else {

801

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

802

sizeof(struct sockaddr_in),

803

addrstr, sizeof(addrstr), NULL, 0,

804

NI_NUMERICHOST);

749

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

750

sizeof(addrstr));

805

751

}

806

if(ret == EAI_SYSTEM){

807

perror_plus("getnameinfo");

808

} else if(ret != 0) {

809

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

810

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

811

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

752

if(pcret == NULL){

753

perror_plus("inet_ntop");

754

} else {

755

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

756

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

757

}

812

758

}

813

759

}

814

760

818

764

}

819

765

820

766

if(af == AF_INET6){

821

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

822

sizeof(struct sockaddr_in6));

767

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

823

768

} else {

824

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

825

sizeof(struct sockaddr_in));

769

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

826

770

}

827

771

if(ret < 0){

828

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

772

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

829

773

int e = errno;

830

774

perror_plus("connect");

831

775

errno = e;

992

936

if(buffer_length > 0){

993

937

ssize_t decrypted_buffer_size;

994

938

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

995

&decrypted_buffer, mc);

939

&decrypted_buffer);

996

940

if(decrypted_buffer_size >= 0){

997

941

998

942

written = 0;

1046

990

return retval;

1047

991

}

1048

992

1049

__attribute__((nonnull))

1050

993

static void resolve_callback(AvahiSServiceResolver *r,

1051

994

AvahiIfIndex interface,

1052

995

AvahiProtocol proto,

1060

1003

AVAHI_GCC_UNUSED AvahiStringList *txt,

1061

1004

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

1005

flags,

1063

void *mc){

1064

if(r == NULL){

1065

return;

1066

}

1006

AVAHI_GCC_UNUSED void* userdata){

1007

assert(r);

1067

1008

1068

1009

/* Called whenever a service has been resolved successfully or

1069

1010

timed out */

1078

1019

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

1079

1020

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

1080

1021

domain,

1081

avahi_strerror(avahi_server_errno

1082

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

1022

avahi_strerror(avahi_server_errno(mc.server)));

1083

1023

break;

1084

1024

1085

1025

case AVAHI_RESOLVER_FOUND:

1091

1031

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

1092

1032

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

1093

1033

}

1094

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

1095

interface,

1096

avahi_proto_to_af(proto),

1097

mc);

1034

int ret = start_mandos_communication(ip, port, interface,

1035

avahi_proto_to_af(proto));

1098

1036

if(ret == 0){

1099

avahi_simple_poll_quit(simple_poll);

1037

avahi_simple_poll_quit(mc.simple_poll);

1100

1038

} else {

1101

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

1102

avahi_proto_to_af(proto),

1103

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

1039

if(not add_server(ip, port, interface,

1040

avahi_proto_to_af(proto))){

1104

1041

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

1105

1042

" list\n", name);

1106

1043

}

1119

1056

const char *domain,

1120

1057

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1121

1058

flags,

1122

void *mc){

1123

if(b == NULL){

1124

return;

1125

}

1059

AVAHI_GCC_UNUSED void* userdata){

1060

assert(b);

1126

1061

1127

1062

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

1128

1063

is removed from the LAN */

1136

1071

case AVAHI_BROWSER_FAILURE:

1137

1072

1138

1073

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

1139

avahi_strerror(avahi_server_errno

1140

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

1141

avahi_simple_poll_quit(simple_poll);

1074

avahi_strerror(avahi_server_errno(mc.server)));

1075

avahi_simple_poll_quit(mc.simple_poll);

1142

1076

return;

1143

1077

1144

1078

case AVAHI_BROWSER_NEW:

1147

1081

the callback function is called the Avahi server will free the

1148

1082

resolver for us. */

1149

1083

1150

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

1151

interface, protocol, name, type,

1152

domain, protocol, 0,

1153

resolve_callback, mc) == NULL)

1084

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

1085

name, type, domain, protocol, 0,

1086

resolve_callback, NULL) == NULL)

1154

1087

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

1155

1088

" %s\n", name,

1156

avahi_strerror(avahi_server_errno

1157

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

1089

avahi_strerror(avahi_server_errno(mc.server)));

1158

1090

break;

1159

1091

1160

1092

case AVAHI_BROWSER_REMOVE:

1179

1111

signal_received = sig;

1180

1112

int old_errno = errno;

1181

1113

/* set main loop to exit */

1182

if(simple_poll != NULL){

1183

avahi_simple_poll_quit(simple_poll);

1114

if(mc.simple_poll != NULL){

1115

avahi_simple_poll_quit(mc.simple_poll);

1184

1116

}

1185

1117

errno = old_errno;

1186

1118

}

1187

1119

1188

__attribute__((nonnull, warn_unused_result))

1189

1120

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

1190

1121

int ret;

1191

error_t ret_errno;

1192

1122

1193

1123

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

1194

1124

if(s < 0){

1195

ret_errno = errno;

1196

1125

perror_plus("socket");

1197

errno = ret_errno;

1198

1126

return false;

1199

1127

}

1200

1128

strcpy(ifr->ifr_name, ifname);

1201

1129

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1202

1130

if(ret == -1){

1203

1131

if(debug){

1204

ret_errno = errno;

1205

1132

perror_plus("ioctl SIOCGIFFLAGS");

1206

errno = ret_errno;

1207

1133

}

1208

1134

return false;

1209

1135

}

1210

1136

return true;

1211

1137

}

1212

1138

1213

__attribute__((nonnull, warn_unused_result))

1214

1139

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

1215

1140

1216

1141

/* Reject the loopback device */

1258

1183

* corresponds to an acceptable network device.

1259

1184

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

1260

1185

*/

1261

__attribute__((nonnull, warn_unused_result))

1262

1186

int good_interface(const struct dirent *if_entry){

1263

1187

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

1264

1188

return 0;

1280

1204

}

1281

1205

1282

1206

/*

1283

* This function determines if a network interface is up.

1284

*/

1285

__attribute__((nonnull, warn_unused_result))

1286

bool interface_is_up(const char *interface){

1287

struct ifreq ifr;

1288

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

1289

if(debug){

1290

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

1291

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

1292

}

1293

return false;

1294

}

1295

1296

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

1297

}

1298

1299

/*

1300

* This function determines if a network interface is running

1301

*/

1302

__attribute__((nonnull, warn_unused_result))

1303

bool interface_is_running(const char *interface){

1304

struct ifreq ifr;

1305

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

1306

if(debug){

1307

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

1308

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

1309

}

1310

return false;

1311

}

1312

1313

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

1314

}

1315

1316

__attribute__((nonnull, pure, warn_unused_result))

1207

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

1208

* corresponds to an acceptable network device which is up.

1209

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

1210

*/

1211

int up_interface(const struct dirent *if_entry){

1212

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

1213

return 0;

1214

}

1215

1216

struct ifreq ifr;

1217

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

1218

if(debug){

1219

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

1220

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

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject down interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

/* Reject non-running interfaces */

1235

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

1236

if(debug){

1237

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

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

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

1244

return 0;

1245

}

1246

return 1;

1247

}

1248

1317

1249

int notdotentries(const struct dirent *direntry){

1318

1250

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

1319

1251

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

1326

1258

}

1327

1259

1328

1260

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

1329

__attribute__((nonnull, warn_unused_result))

1330

1261

int runnable_hook(const struct dirent *direntry){

1331

1262

int ret;

1332

1263

size_t sret;

1340

1271

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

1341

1272

"abcdefghijklmnopqrstuvwxyz"

1342

1273

"0123456789"

1343

"_.-");

1274

"_-");

1344

1275

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

1345

1276

/* Contains non-allowed characters */

1346

1277

if(debug){

1350

1281

return 0;

1351

1282

}

1352

1283

1353

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

1284

char *fullname = NULL;

1285

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

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1354

1292

if(ret == -1){

1355

1293

if(debug){

1356

1294

perror_plus("Could not stat hook");

1380

1318

return 1;

1381

1319

}

1382

1320

1383

__attribute__((nonnull, warn_unused_result))

1384

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1385

mandos_context *mc){

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1386

1322

int ret;

1387

1323

struct timespec now;

1388

1324

struct timespec waited_time;

1389

1325

intmax_t block_time;

1390

1326

1391

1327

while(true){

1392

if(mc->current_server == NULL){

1393

if(debug){

1328

if(mc.current_server == NULL){

1329

if (debug){

1394

1330

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

1395

1331

" No timeout!\n");

1396

1332

}

1397

1333

ret = avahi_simple_poll_iterate(s, -1);

1398

1334

} else {

1399

if(debug){

1335

if (debug){

1400

1336

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

1401

1337

" it, or wait\n");

1402

1338

}

1409

1345

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

1410

1346

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

1411

1347

waited_time.tv_sec = (now.tv_sec

1412

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

1348

- mc.current_server->last_seen.tv_sec);

1413

1349

waited_time.tv_nsec = (now.tv_nsec

1414

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

1350

- mc.current_server->last_seen.tv_nsec);

1415

1351

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

1416

1352

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

1417

1353

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

1419

1355

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

1420

1356

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

1421

1357

1422

if(debug){

1358

if (debug){

1423

1359

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

1424

1360

block_time);

1425

1361

}

1426

1362

1427

1363

if(block_time <= 0){

1428

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

1429

mc->current_server->port,

1430

mc->current_server->if_index,

1431

mc->current_server->af, mc);

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1432

1368

if(ret == 0){

1433

avahi_simple_poll_quit(s);

1369

avahi_simple_poll_quit(mc.simple_poll);

1434

1370

return 0;

1435

1371

}

1436

1372

ret = clock_gettime(CLOCK_MONOTONIC,

1437

&mc->current_server->last_seen);

1373

&mc.current_server->last_seen);

1438

1374

if(ret == -1){

1439

1375

perror_plus("clock_gettime");

1440

1376

return -1;

1441

1377

}

1442

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

1378

mc.current_server = mc.current_server->next;

1443

1379

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

1444

1380

servers, but don't block */

1445

1381

}

1447

1383

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

1448

1384

}

1449

1385

if(ret != 0){

1450

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

1386

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

1451

1387

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

1452

1388

}

1453

1389

}

1454

1390

}

1455

1391

}

1456

1392

1457

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

1458

__attribute__((warn_unused_result))

1459

error_t raise_privileges(void){

1460

error_t old_errno = errno;

1461

error_t ret_errno = 0;

1462

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

1463

ret_errno = errno;

1464

}

1465

errno = old_errno;

1466

return ret_errno;

1467

}

1468

1469

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

1470

__attribute__((warn_unused_result))

1471

error_t raise_privileges_permanently(void){

1472

error_t old_errno = errno;

1473

error_t ret_errno = raise_privileges();

1474

if(ret_errno != 0){

1475

errno = old_errno;

1476

return ret_errno;

1477

}

1478

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

1479

ret_errno = errno;

1480

}

1481

errno = old_errno;

1482

return ret_errno;

1483

}

1484

1485

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

1486

__attribute__((warn_unused_result))

1487

error_t lower_privileges(void){

1488

error_t old_errno = errno;

1489

error_t ret_errno = 0;

1490

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

1491

ret_errno = errno;

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

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

}

1505

errno = old_errno;

1506

return ret_errno;

1507

}

1508

1509

__attribute__((nonnull))

1510

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

1393

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

1511

1394

const float delay){

1512

struct dirent **direntries = NULL;

1513

if(hookdir_fd == -1){

1514

hookdir_fd = open(hookdir, O_RDONLY);

1515

if(hookdir_fd == -1){

1516

if(errno == ENOENT){

1517

if(debug){

1518

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

1519

" found\n", hookdir);

1520

}

1521

} else {

1522

perror_plus("open");

1523

}

1524

return;

1525

}

1526

}

1527

#ifdef __GLIBC__

1528

#if __GLIBC_PREREQ(2, 15)

1529

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

1530

runnable_hook, alphasort);

1531

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

1532

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

1533

alphasort);

1534

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

1535

#else /* not __GLIBC__ */

1536

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

1537

alphasort);

1538

#endif /* not __GLIBC__ */

1395

struct dirent **direntries;

1396

struct dirent *direntry;

1397

int ret;

1398

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

1399

alphasort);

1539

1400

if(numhooks == -1){

1540

1401

perror_plus("scandir");

1541

return;

1542

}

1543

struct dirent *direntry;

1544

int ret;

1545

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

1546

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

1547

direntry = direntries[i];

1548

if(debug){

1549

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

1550

direntry->d_name);

1551

}

1552

pid_t hook_pid = fork();

1553

if(hook_pid == 0){

1554

/* Child */

1555

/* Raise privileges */

1556

errno = raise_privileges_permanently();

1557

if(errno != 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){

1402

} else {

1403

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

1404

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

1405

direntry = direntries[i];

1406

char *fullname = NULL;

1407

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

1408

if(ret < 0){

1613

1409

perror_plus("asprintf");

1614

_exit(EX_OSERR);

1615

}

1616

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

1617

if(ret == -1){

1410

continue;

1411

}

1412

if(debug){

1413

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

1414

direntry->d_name);

1415

}

1416

pid_t hook_pid = fork();

1417

if(hook_pid == 0){

1418

/* Child */

1419

/* Raise privileges */

1420

errno = 0;

1421

ret = seteuid(0);

1422

if(ret == -1){

1423

perror_plus("seteuid");

1424

}

1425

/* Raise privileges even more */

1426

errno = 0;

1427

ret = setuid(0);

1428

if(ret == -1){

1429

perror_plus("setuid");

1430

}

1431

/* Set group */

1432

errno = 0;

1433

ret = setgid(0);

1434

if(ret == -1){

1435

perror_plus("setgid");

1436

}

1437

/* Reset supplementary groups */

1438

errno = 0;

1439

ret = setgroups(0, NULL);

1440

if(ret == -1){

1441

perror_plus("setgroups");

1442

}

1443

dup2(devnull, STDIN_FILENO);

1444

close(devnull);

1445

dup2(STDERR_FILENO, STDOUT_FILENO);

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

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

1462

if(ret == -1){

1463

perror_plus("setenv");

1464

_exit(EX_OSERR);

1465

}

1466

char *delaystring;

1467

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

1468

if(ret == -1){

1469

perror_plus("asprintf");

1470

_exit(EX_OSERR);

1471

}

1472

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

1473

if(ret == -1){

1474

free(delaystring);

1475

perror_plus("setenv");

1476

_exit(EX_OSERR);

1477

}

1618

1478

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;

1662

} 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);

1680

}

1681

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;

1686

int ret;

1687

struct ifreq network;

1688

unsigned int if_index = if_nametoindex(interface);

1689

if(if_index == 0){

1690

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

1691

errno = old_errno;

1692

return ENXIO;

1693

}

1694

1695

if(quit_now){

1696

errno = old_errno;

1697

return EINTR;

1698

}

1699

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

errno = ret_errno;

1737

perror_plus("Failed to raise privileges");

1738

}

1739

1740

#ifdef __linux__

1741

int ret_linux;

1742

bool restore_loglevel = false;

1743

if(ret_errno == 0){

1744

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1745

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

1746

ret_linux = klogctl(8, NULL, 5);

1747

if(ret_linux == -1){

1748

perror_plus("klogctl");

1749

} else {

1750

restore_loglevel = true;

1751

}

1752

}

1753

#endif /* __linux__ */

1754

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

1755

ioctl_errno = errno;

1756

#ifdef __linux__

1757

if(restore_loglevel){

1758

ret_linux = klogctl(7, NULL, 0);

1759

if(ret_linux == -1){

1760

perror_plus("klogctl");

1761

}

1762

}

1763

#endif /* __linux__ */

1764

1765

/* If raise_privileges() succeeded above */

1766

if(ret_errno == 0){

1767

/* Lower privileges */

1768

ret_errno = lower_privileges();

1769

if(ret_errno != 0){

1770

errno = ret_errno;

1771

perror_plus("Failed to lower privileges");

1772

}

1773

}

1774

1775

/* Close the socket */

1776

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

1777

if(ret == -1){

1778

perror_plus("close");

1779

}

1780

1781

if(ret_setflags == -1){

1782

errno = ioctl_errno;

1783

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1784

errno = old_errno;

1785

return ioctl_errno;

1786

}

1787

} else if(debug){

1788

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

1789

interface);

1790

}

1791

1792

/* Sleep checking until interface is running.

1793

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

1794

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

1795

if(interface_is_running(interface)){

1796

break;

1797

}

1798

struct timespec sleeptime = { .tv_nsec = 250000000 };

1799

ret = nanosleep(&sleeptime, NULL);

1800

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

1801

perror_plus("nanosleep");

1802

}

1803

}

1804

1805

errno = old_errno;

1806

return 0;

1807

}

1808

1809

__attribute__((nonnull, warn_unused_result))

1810

error_t take_down_interface(const char *const interface){

1811

error_t old_errno = errno;

1812

struct ifreq network;

1813

unsigned int if_index = if_nametoindex(interface);

1814

if(if_index == 0){

1815

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

1816

errno = old_errno;

1817

return ENXIO;

1818

}

1819

if(interface_is_up(interface)){

1820

error_t ret_errno = 0, ioctl_errno = 0;

1821

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

1822

ret_errno = errno;

1823

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

1824

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

1825

errno = old_errno;

1826

return ret_errno;

1827

}

1828

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

1829

1830

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

1831

if(sd == -1){

1832

ret_errno = errno;

1833

perror_plus("socket");

1834

errno = old_errno;

1835

return ret_errno;

1836

}

1837

1838

if(debug){

1839

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

1840

interface);

1841

}

1842

1843

/* Raise privileges */

1844

ret_errno = raise_privileges();

1845

if(ret_errno != 0){

1846

errno = ret_errno;

1847

perror_plus("Failed to raise privileges");

1848

}

1849

1850

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

1851

ioctl_errno = errno;

1852

1853

/* If raise_privileges() succeeded above */

1854

if(ret_errno == 0){

1855

/* Lower privileges */

1856

ret_errno = lower_privileges();

1857

if(ret_errno != 0){

1858

errno = ret_errno;

1859

perror_plus("Failed to lower privileges");

1860

}

1861

}

1862

1863

/* Close the socket */

1864

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

1865

if(ret == -1){

1866

perror_plus("close");

1867

}

1868

1869

if(ret_setflags == -1){

1870

errno = ioctl_errno;

1871

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1872

errno = old_errno;

1873

return ioctl_errno;

1874

}

1875

} else if(debug){

1876

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

1877

interface);

1878

}

1879

1880

errno = old_errno;

1881

return 0;

1479

if(connect_to != NULL){

1480

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

1481

if(ret == -1){

1482

perror_plus("setenv");

1483

_exit(EX_OSERR);

1484

}

1485

}

1486

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

1487

perror_plus("execl");

1488

_exit(EXIT_FAILURE);

1489

}

1490

} else {

1491

int status;

1492

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

1493

perror_plus("waitpid");

1494

free(fullname);

1495

continue;

1496

}

1497

if(WIFEXITED(status)){

1498

if(WEXITSTATUS(status) != 0){

1499

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

1500

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

1501

WEXITSTATUS(status));

1502

free(fullname);

1503

continue;

1504

}

1505

} else if(WIFSIGNALED(status)){

1506

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

1507

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

1508

WTERMSIG(status));

1509

free(fullname);

1510

continue;

1511

} else {

1512

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

1513

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

1514

free(fullname);

1515

continue;

1516

}

1517

}

1518

free(fullname);

1519

if(debug){

1520

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

1521

direntry->d_name);

1522

}

1523

}

1524

close(devnull);

1525

}

1526

return true;

1882

1527

}

1883

1528

1884

1529

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

1885

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

1886

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

1887

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

1888

.interfaces = NULL, .interfaces_size = 0 };

1889

1530

AvahiSServiceBrowser *sb = NULL;

1890

error_t ret_errno;

1531

int error;

1891

1532

int ret;

1892

1533

intmax_t tmpmax;

1893

1534

char *tmp;

1894

1535

int exitcode = EXIT_SUCCESS;

1895

char *interfaces_to_take_down = NULL;

1896

size_t interfaces_to_take_down_size = 0;

1897

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

1898

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

1899

char *tempdir = NULL;

1536

const char *interface = "";

1537

struct ifreq network;

1538

int sd = -1;

1539

bool take_down_interface = false;

1540

uid_t uid;

1541

gid_t gid;

1542

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

1543

bool tempdir_created = false;

1900

1544

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1901

1545

const char *seckey = PATHDIR "/" SECKEY;

1902

1546

const char *pubkey = PATHDIR "/" PUBKEY;

1903

char *interfaces_hooks = NULL;

1904

1547

1905

1548

bool gnutls_initialized = false;

1906

1549

bool gpgme_initialized = false;

1997

1640

connect_to = arg;

1998

1641

break;

1999

1642

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

2000

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

2001

arg, (int)',');

2002

if(ret_errno != 0){

2003

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

2004

}

1643

interface = arg;

2005

1644

break;

2006

1645

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

2007

1646

seckey = arg;

2084

1723

/* Work around Debian bug #633582:

2085

1724

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

2086

1725

2087

/* Re-raise privileges */

2088

ret_errno = raise_privileges();

2089

if(ret_errno != 0){

2090

errno = ret_errno;

2091

perror_plus("Failed to raise privileges");

1726

/* Re-raise priviliges */

1727

errno = 0;

1728

ret = seteuid(0);

1729

if(ret == -1){

1730

perror_plus("seteuid");

2092

1731

} else {

2093

1732

struct stat st;

2094

1733

2135

1774

}

2136

1775

2137

1776

/* Lower privileges */

2138

ret_errno = lower_privileges();

2139

if(ret_errno != 0){

2140

errno = ret_errno;

2141

perror_plus("Failed to lower privileges");

2142

}

2143

}

2144

}

2145

2146

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

2147

{

2148

char *interface = NULL;

2149

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

2150

interface))){

2151

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

2152

and if_nametoindex(interface) == 0){

2153

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

2154

fprintf_plus(stderr, "Not using nonexisting interface"

2155

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

2156

}

2157

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

2158

interface = NULL;

1777

errno = 0;

1778

ret = seteuid(uid);

1779

if(ret == -1){

1780

perror_plus("seteuid");

2159

1781

}

2160

1782

}

2161

1783

}

2162

1784

2163

1785

/* Run network hooks */

2164

{

2165

if(mc.interfaces != NULL){

2166

interfaces_hooks = malloc(mc.interfaces_size);

2167

if(interfaces_hooks == NULL){

2168

perror_plus("malloc");

2169

goto end;

2170

}

2171

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

2172

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

2173

}

2174

run_network_hooks("start", interfaces_hooks != NULL ?

2175

interfaces_hooks : "", delay);

1786

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

1787

goto end;

2176

1788

}

2177

1789

2178

1790

if(not debug){

2179

1791

avahi_set_log_function(empty_log);

2180

1792

}

2181

1793

1794

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

1795

struct dirent **direntries;

1796

/* First look for interfaces that are up */

1797

ret = scandir(sys_class_net, &direntries, up_interface,

1798

alphasort);

1799

if(ret == 0){

1800

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

1801

free(direntries);

1802

ret = scandir(sys_class_net, &direntries, good_interface,

1803

alphasort);

1804

}

1805

if(ret >= 1){

1806

/* Pick the first interface returned */

1807

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

1808

if(debug){

1809

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

1810

}

1811

if(interface == NULL){

1812

perror_plus("malloc");

1813

free(direntries);

1814

exitcode = EXIT_FAILURE;

1815

goto end;

1816

}

1817

free(direntries);

1818

} else {

1819

free(direntries);

1820

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

1821

exitcode = EXIT_FAILURE;

1822

goto end;

1823

}

1824

}

1825

2182

1826

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

2183

1827

from the signal handler */

2184

1828

/* Initialize the pseudo-RNG for Avahi */

2185

1829

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

2186

simple_poll = avahi_simple_poll_new();

2187

if(simple_poll == NULL){

1830

mc.simple_poll = avahi_simple_poll_new();

1831

if(mc.simple_poll == NULL){

2188

1832

fprintf_plus(stderr,

2189

1833

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

2190

1834

exitcode = EX_UNAVAILABLE;

2254

1898

}

2255

1899

}

2256

1900

2257

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

2258

if(mc.interfaces == NULL){

2259

struct dirent **direntries = NULL;

2260

/* Look for any good interfaces */

2261

ret = scandir(sys_class_net, &direntries, good_interface,

2262

alphasort);

2263

if(ret >= 1){

2264

/* Add all found interfaces to interfaces list */

2265

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

2266

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

2267

direntries[i]->d_name);

2268

if(ret_errno != 0){

2269

errno = ret_errno;

2270

perror_plus("argz_add");

2271

continue;

2272

}

2273

if(debug){

2274

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

2275

direntries[i]->d_name);

2276

}

2277

}

2278

free(direntries);

2279

} else {

2280

if(ret == 0){

2281

free(direntries);

2282

}

2283

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

2284

exitcode = EXIT_FAILURE;

2285

goto end;

2286

}

2287

}

2288

2289

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

2290

{

2291

char *interface = NULL;

2292

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

2293

interface))){

2294

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

2295

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

2296

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

2297

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

2298

interface);

2299

interface = NULL;

2300

while((interface = argz_next(mc.interfaces,

2301

mc.interfaces_size, interface))){

2302

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

2303

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

2304

interface);

2305

interface = NULL;

1901

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

1902

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

1903

if_index = (AvahiIfIndex) if_nametoindex(interface);

1904

if(if_index == 0){

1905

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

1906

exitcode = EX_UNAVAILABLE;

1907

goto end;

1908

}

1909

1910

if(quit_now){

1911

goto end;

1912

}

1913

1914

/* Re-raise priviliges */

1915

errno = 0;

1916

ret = seteuid(0);

1917

if(ret == -1){

1918

perror_plus("seteuid");

1919

}

1920

1921

#ifdef __linux__

1922

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1923

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

1924

ret = klogctl(8, NULL, 5);

1925

bool restore_loglevel = true;

1926

if(ret == -1){

1927

restore_loglevel = false;

1928

perror_plus("klogctl");

1929

}

1930

#endif /* __linux__ */

1931

1932

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1933

if(sd < 0){

1934

perror_plus("socket");

1935

exitcode = EX_OSERR;

1936

#ifdef __linux__

1937

if(restore_loglevel){

1938

ret = klogctl(7, NULL, 0);

1939

if(ret == -1){

1940

perror_plus("klogctl");

1941

}

1942

}

1943

#endif /* __linux__ */

1944

/* Lower privileges */

1945

errno = 0;

1946

ret = seteuid(uid);

1947

if(ret == -1){

1948

perror_plus("seteuid");

1949

}

1950

goto end;

1951

}

1952

strcpy(network.ifr_name, interface);

1953

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

1954

if(ret == -1){

1955

perror_plus("ioctl SIOCGIFFLAGS");

1956

#ifdef __linux__

1957

if(restore_loglevel){

1958

ret = klogctl(7, NULL, 0);

1959

if(ret == -1){

1960

perror_plus("klogctl");

1961

}

1962

}

1963

#endif /* __linux__ */

1964

exitcode = EX_OSERR;

1965

/* Lower privileges */

1966

errno = 0;

1967

ret = seteuid(uid);

1968

if(ret == -1){

1969

perror_plus("seteuid");

1970

}

1971

goto end;

1972

}

1973

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

1974

network.ifr_flags |= IFF_UP;

1975

take_down_interface = true;

1976

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

1977

if(ret == -1){

1978

take_down_interface = false;

1979

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1980

exitcode = EX_OSERR;

1981

#ifdef __linux__

1982

if(restore_loglevel){

1983

ret = klogctl(7, NULL, 0);

1984

if(ret == -1){

1985

perror_plus("klogctl");

2306

1986

}

2307

1987

}

1988

#endif /* __linux__ */

1989

/* Lower privileges */

1990

errno = 0;

1991

ret = seteuid(uid);

1992

if(ret == -1){

1993

perror_plus("seteuid");

1994

}

1995

goto end;

1996

}

1997

}

1998

/* Sleep checking until interface is running.

1999

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

2000

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

2001

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

2002

if(ret == -1){

2003

perror_plus("ioctl SIOCGIFFLAGS");

2004

} else if(network.ifr_flags & IFF_RUNNING){

2308

2005

break;

2309

2006

}

2310

bool interface_was_up = interface_is_up(interface);

2311

errno = bring_up_interface(interface, delay);

2312

if(not interface_was_up){

2313

if(errno != 0){

2314

perror_plus("Failed to bring up interface");

2315

} else {

2316

errno = argz_add(&interfaces_to_take_down,

2317

&interfaces_to_take_down_size,

2318

interface);

2319

if(errno != 0){

2320

perror_plus("argz_add");

2321

}

2322

}

2323

}

2324

}

2325

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

2326

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

2327

}

2328

}

2329

2330

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

2331

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

2332

if(debug){

2333

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

2334

mc.interfaces);

2335

}

2336

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

2007

struct timespec sleeptime = { .tv_nsec = 250000000 };

2008

ret = nanosleep(&sleeptime, NULL);

2009

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

2010

perror_plus("nanosleep");

2011

}

2012

}

2013

if(not take_down_interface){

2014

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

2015

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

2016

if(ret == -1){

2017

perror_plus("close");

2018

}

2019

}

2020

#ifdef __linux__

2021

if(restore_loglevel){

2022

/* Restores kernel loglevel to default */

2023

ret = klogctl(7, NULL, 0);

2024

if(ret == -1){

2025

perror_plus("klogctl");

2026

}

2027

}

2028

#endif /* __linux__ */

2029

/* Lower privileges */

2030

errno = 0;

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

2035

}

2337

2036

}

2338

2037

2339

2038

if(quit_now){

2340

2039

goto end;

2341

2040

}

2342

2041

2343

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

2042

ret = init_gnutls_global(pubkey, seckey);

2344

2043

if(ret == -1){

2345

2044

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

2346

2045

exitcode = EX_UNAVAILABLE;

2353

2052

goto end;

2354

2053

}

2355

2054

2356

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

2357

tempdir = mkdtemp(run_tempdir);

2358

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

2359

if(debug){

2360

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

2361

run_tempdir, old_tempdir);

2362

}

2363

tempdir = mkdtemp(old_tempdir);

2364

}

2365

if(tempdir == NULL){

2055

if(mkdtemp(tempdir) == NULL){

2366

2056

perror_plus("mkdtemp");

2367

2057

goto end;

2368

2058

}

2059

tempdir_created = true;

2369

2060

2370

2061

if(quit_now){

2371

2062

goto end;

2372

2063

}

2373

2064

2374

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

2065

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

2375

2066

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

2376

2067

exitcode = EX_UNAVAILABLE;

2377

2068

goto end;

2387

2078

/* Connect directly, do not use Zeroconf */

2388

2079

/* (Mainly meant for debugging) */

2389

2080

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

2390

2391

2081

if(address == NULL){

2392

2082

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

2393

2083

exitcode = EX_USAGE;

2398

2088

goto end;

2399

2089

}

2400

2090

2401

in_port_t port;

2091

uint16_t port;

2402

2092

errno = 0;

2403

2093

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

2404

2094

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

2405

or tmpmax != (in_port_t)tmpmax){

2095

or tmpmax != (uint16_t)tmpmax){

2406

2096

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

2407

2097

exitcode = EX_USAGE;

2408

2098

goto end;

2409

2099

}

2410

2100

2411

2101

if(quit_now){

2412

2102

goto end;

2413

2103

}

2414

2104

2415

port = (in_port_t)tmpmax;

2105

port = (uint16_t)tmpmax;

2416

2106

*address = '\0';

2417

2107

/* Colon in address indicates IPv6 */

2418

2108

int af;

2434

2124

}

2435

2125

2436

2126

while(not quit_now){

2437

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

2438

&mc);

2127

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

2439

2128

if(quit_now or ret == 0){

2440

2129

break;

2441

2130

}

2443

2132

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

2444

2133

(int)retry_interval);

2445

2134

}

2446

sleep((unsigned int)retry_interval);

2135

sleep((int)retry_interval);

2447

2136

}

2448

2137

2449

if(not quit_now){

2138

if (not quit_now){

2450

2139

exitcode = EXIT_SUCCESS;

2451

2140

}

2452

2141

2467

2156

config.publish_domain = 0;

2468

2157

2469

2158

/* Allocate a new server */

2470

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2471

&config, NULL, NULL, &ret_errno);

2159

mc.server = avahi_server_new(avahi_simple_poll_get

2160

(mc.simple_poll), &config, NULL,

2161

NULL, &error);

2472

2162

2473

2163

/* Free the Avahi configuration data */

2474

2164

avahi_server_config_free(&config);

2477

2167

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

2478

2168

if(mc.server == NULL){

2479

2169

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

2480

avahi_strerror(ret_errno));

2170

avahi_strerror(error));

2481

2171

exitcode = EX_UNAVAILABLE;

2482

2172

goto end;

2483

2173

}

2489

2179

/* Create the Avahi service browser */

2490

2180

sb = avahi_s_service_browser_new(mc.server, if_index,

2491

2181

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2492

NULL, 0, browse_callback,

2493

(void *)&mc);

2182

NULL, 0, browse_callback, NULL);

2494

2183

if(sb == NULL){

2495

2184

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

2496

2185

avahi_strerror(avahi_server_errno(mc.server)));

2507

2196

if(debug){

2508

2197

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

2509

2198

}

2510

2511

ret = avahi_loop_with_timeout(simple_poll,

2512

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

2199

2200

ret = avahi_loop_with_timeout(mc.simple_poll,

2201

(int)(retry_interval * 1000));

2513

2202

if(debug){

2514

2203

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

2515

2204

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

2522

2211

}

2523

2212

2524

2213

/* Cleanup things */

2525

free(mc.interfaces);

2526

2527

2214

if(sb != NULL)

2528

2215

avahi_s_service_browser_free(sb);

2529

2216

2530

2217

if(mc.server != NULL)

2531

2218

avahi_server_free(mc.server);

2532

2219

2533

if(simple_poll != NULL)

2534

avahi_simple_poll_free(simple_poll);

2220

if(mc.simple_poll != NULL)

2221

avahi_simple_poll_free(mc.simple_poll);

2535

2222

2536

2223

if(gnutls_initialized){

2537

2224

gnutls_certificate_free_credentials(mc.cred);

2554

2241

}

2555

2242

}

2556

2243

2557

/* Re-raise privileges */

2244

/* Run network hooks */

2245

run_network_hooks("stop", interface, delay);

2246

2247

/* Re-raise priviliges */

2558

2248

{

2559

ret_errno = raise_privileges();

2560

if(ret_errno != 0){

2561

errno = ret_errno;

2562

perror_plus("Failed to raise privileges");

2563

} else {

2564

2565

/* Run network hooks */

2566

run_network_hooks("stop", interfaces_hooks != NULL ?

2567

interfaces_hooks : "", delay);

2568

2569

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

2570

{

2571

char *interface = NULL;

2572

while((interface=argz_next(interfaces_to_take_down,

2573

interfaces_to_take_down_size,

2574

interface))){

2575

ret_errno = take_down_interface(interface);

2576

if(ret_errno != 0){

2577

errno = ret_errno;

2578

perror_plus("Failed to take down interface");

2579

}

2580

}

2581

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

2582

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

2583

" down\n");

2584

}

2585

}

2249

errno = 0;

2250

ret = seteuid(0);

2251

if(ret == -1){

2252

perror_plus("seteuid");

2586

2253

}

2587

2254

2588

ret_errno = lower_privileges_permanently();

2589

if(ret_errno != 0){

2590

errno = ret_errno;

2591

perror_plus("Failed to lower privileges permanently");

2255

/* Take down the network interface */

2256

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

2257

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

2258

if(ret == -1){

2259

perror_plus("ioctl SIOCGIFFLAGS");

2260

} else if(network.ifr_flags & IFF_UP){

2261

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

2262

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

2263

if(ret == -1){

2264

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2265

}

2266

}

2267

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

2268

if(ret == -1){

2269

perror_plus("close");

2270

}

2592

2271

}

2593

2272

}

2594

2595

free(interfaces_to_take_down);

2596

free(interfaces_hooks);

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

2597

2279

2598

2280

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

2599

if(tempdir != NULL){

2281

if(tempdir_created){

2600

2282

struct dirent **direntries = NULL;

2601

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

2602

O_NOFOLLOW));

2603

if(tempdir_fd == -1){

2604

perror_plus("open");

2605

} else {

2606

#ifdef __GLIBC__

2607

#if __GLIBC_PREREQ(2, 15)

2608

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

2609

notdotentries, alphasort);

2610

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

2611

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

2612

alphasort);

2613

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

2614

#else /* not __GLIBC__ */

2615

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

2616

alphasort);

2617

#endif /* not __GLIBC__ */

2618

if(numentries >= 0){

2619

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

2620

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

2621

if(ret == -1){

2622

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

2623

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

2624

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

2625

}

2626

}

2627

2628

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

2629

free(direntries);

2630

if(numentries == -1){

2631

perror_plus("scandir");

2632

}

2633

ret = rmdir(tempdir);

2634

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

2635

perror_plus("rmdir");

2636

}

2283

struct dirent *direntry = NULL;

2284

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

2285

alphasort);

2286

if (numentries > 0){

2287

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

2288

direntry = direntries[i];

2289

char *fullname = NULL;

2290

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

2291

direntry->d_name);

2292

if(ret < 0){

2293

perror_plus("asprintf");

2294

continue;

2295

}

2296

ret = remove(fullname);

2297

if(ret == -1){

2298

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

2299

strerror(errno));

2300

}

2301

free(fullname);

2637

2302

}

2638

TEMP_FAILURE_RETRY(close(tempdir_fd));

2303

}

2304

2305

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

2306

free(direntries);

2307

if (numentries == -1){

2308

perror_plus("scandir");

2309

}

2310

ret = rmdir(tempdir);

2311

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

2312

perror_plus("rmdir");

2639

2313

}

2640

2314

}

2641

2315