/mandos/trunk : revision 539

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() */

44

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

43

stdout, ferror(), remove() */

44

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

45

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

46

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

47

strtof(), abort() */

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

58

inet_pton(), connect() */

59

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

61

60

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

62

61

*/

63

62

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

64

63

strtoimax() */

64

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

65

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

66

program_invocation_short_name */

67

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

73

*/

74

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

75

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

76

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

77

unlinkat() */

78

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

76

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

77

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

79

78

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

80

79

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

81

80

argp_state, struct argp,

89

88

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

90

89

WEXITSTATUS(), WTERMSIG() */

91

90

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

92

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

93

argz_delete(), argz_append(),

94

argz_stringify(), argz_add(),

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

98

91

99

92

#ifdef __linux__

100

93

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

142

135

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

143

136

char *connect_to = NULL;

144

137

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

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){

236

221

perror_plus("strdup");

237

222

return false;

238

223

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

224

/* Special case of first server */

245

if(*current_server == NULL){

225

if (mc.current_server == NULL){

246

226

new_server->next = new_server;

247

227

new_server->prev = new_server;

248

*current_server = new_server;

228

mc.current_server = new_server;

229

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

249

230

} else {

250

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

251

new_server->next = *current_server;

252

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

231

new_server->next = mc.current_server;

232

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

253

233

new_server->prev->next = new_server;

254

(*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;

255

240

}

256

241

return true;

257

242

}

259

244

/*

260

245

* Initialize GPGME.

261

246

*/

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){

247

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

248

const char *tempdir){

267

249

gpgme_error_t rc;

268

250

gpgme_engine_info_t engine_info;

269

251

252

270

253

/*

271

254

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

272

255

*/

273

bool import_key(const char * const filename){

256

bool import_key(const char *filename){

274

257

int ret;

275

258

int fd;

276

259

gpgme_data_t pgp_data;

288

271

return false;

289

272

}

290

273

291

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

274

rc = gpgme_op_import(mc.ctx, pgp_data);

292

275

if(rc != GPG_ERR_NO_ERROR){

293

276

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

294

277

gpgme_strsource(rc), gpgme_strerror(rc));

338

321

}

339

322

340

323

/* Create new GPGME "context" */

341

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

324

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

342

325

if(rc != GPG_ERR_NO_ERROR){

343

326

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

344

327

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

357

340

* Decrypt OpenPGP data.

358

341

* Returns -1 on error

359

342

*/

360

__attribute__((nonnull, warn_unused_result))

361

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

362

344

size_t crypto_size,

363

char **plaintext,

364

mandos_context *mc){

345

char **plaintext){

365

346

gpgme_data_t dh_crypto, dh_plain;

366

347

gpgme_error_t rc;

367

348

ssize_t ret;

393

374

394

375

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

395

376

data buffer */

396

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

377

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

397

378

if(rc != GPG_ERR_NO_ERROR){

398

379

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

399

380

gpgme_strsource(rc), gpgme_strerror(rc));

400

381

plaintext_length = -1;

401

382

if(debug){

402

383

gpgme_decrypt_result_t result;

403

result = gpgme_op_decrypt_result(mc->ctx);

384

result = gpgme_op_decrypt_result(mc.ctx);

404

385

if(result == NULL){

405

386

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

406

387

} else {

483

464

return plaintext_length;

484

465

}

485

466

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

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 */

489

470

if(ret == NULL)

490

471

ret = "(unknown)";

491

472

return ret;

492

473

}

493

474

494

475

/* GnuTLS log function callback */

495

__attribute__((nonnull))

496

476

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

497

477

const char* string){

498

478

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

499

479

}

500

480

501

__attribute__((nonnull, warn_unused_result))

502

481

static int init_gnutls_global(const char *pubkeyfilename,

503

const char *seckeyfilename,

504

mandos_context *mc){

482

const char *seckeyfilename){

505

483

int ret;

506

484

507

485

if(debug){

524

502

}

525

503

526

504

/* OpenPGP credentials */

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

528

506

if(ret != GNUTLS_E_SUCCESS){

529

507

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

530

508

safer_gnutls_strerror(ret));

540

518

}

541

519

542

520

ret = gnutls_certificate_set_openpgp_key_file

543

(mc->cred, pubkeyfilename, seckeyfilename,

521

(mc.cred, pubkeyfilename, seckeyfilename,

544

522

GNUTLS_OPENPGP_FMT_BASE64);

545

523

if(ret != GNUTLS_E_SUCCESS){

546

524

fprintf_plus(stderr,

552

530

}

553

531

554

532

/* GnuTLS server initialization */

555

ret = gnutls_dh_params_init(&mc->dh_params);

533

ret = gnutls_dh_params_init(&mc.dh_params);

556

534

if(ret != GNUTLS_E_SUCCESS){

557

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

558

536

" initialization: %s\n",

559

537

safer_gnutls_strerror(ret));

560

538

goto globalfail;

561

539

}

562

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

540

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

563

541

if(ret != GNUTLS_E_SUCCESS){

564

542

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

565

543

safer_gnutls_strerror(ret));

566

544

goto globalfail;

567

545

}

568

546

569

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

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

570

548

571

549

return 0;

572

550

573

551

globalfail:

574

552

575

gnutls_certificate_free_credentials(mc->cred);

553

gnutls_certificate_free_credentials(mc.cred);

576

554

gnutls_global_deinit();

577

gnutls_dh_params_deinit(mc->dh_params);

555

gnutls_dh_params_deinit(mc.dh_params);

578

556

return -1;

579

557

}

580

558

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

559

static int init_gnutls_session(gnutls_session_t *session){

584

560

int ret;

585

561

/* GnuTLS session creation */

586

562

do {

598

574

{

599

575

const char *err;

600

576

do {

601

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

577

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

602

578

if(quit_now){

603

579

gnutls_deinit(*session);

604

580

return -1;

615

591

616

592

do {

617

593

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

618

mc->cred);

594

mc.cred);

619

595

if(quit_now){

620

596

gnutls_deinit(*session);

621

597

return -1;

631

607

/* ignore client certificate if any. */

632

608

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

633

609

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

635

611

636

612

return 0;

637

613

}

641

617

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

642

618

643

619

/* Called when a Mandos server is found */

644

__attribute__((nonnull, warn_unused_result))

645

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

620

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

646

621

AvahiIfIndex if_index,

647

int af, mandos_context *mc){

622

int af){

648

623

int ret, tcp_sd = -1;

649

624

ssize_t sret;

650

struct sockaddr_storage to;

625

union {

626

struct sockaddr_in in;

627

struct sockaddr_in6 in6;

628

} to;

651

629

char *buffer = NULL;

652

630

char *decrypted_buffer = NULL;

653

631

size_t buffer_length = 0;

677

655

return -1;

678

656

}

679

657

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);

658

ret = init_gnutls_session(&session);

713

659

if(ret != 0){

714

660

return -1;

715

661

}

716

662

717

663

if(debug){

718

664

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

719

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

665

PRIu16 "\n", ip, port);

720

666

}

721

667

722

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

734

680

735

681

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

736

682

if(af == AF_INET6){

737

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

738

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

683

to.in6.sin6_family = (sa_family_t)af;

684

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

739

685

} else { /* IPv4 */

740

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

741

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

686

to.in.sin_family = (sa_family_t)af;

687

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

742

688

}

743

689

if(ret < 0 ){

744

690

int e = errno;

753

699

goto mandos_end;

754

700

}

755

701

if(af == AF_INET6){

756

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

757

if(IN6_IS_ADDR_LINKLOCAL

758

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

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*/

759

709

if(if_index == AVAHI_IF_UNSPEC){

760

710

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

761

711

" incomplete without a network interface\n");

763

713

goto mandos_end;

764

714

}

765

715

/* Set the network interface number as scope */

766

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

716

to.in6.sin6_scope_id = (uint32_t)if_index;

767

717

}

768

718

} else {

769

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

719

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

720

-Wconversion and

721

-Wunreachable-code */

770

722

}

771

723

772

724

if(quit_now){

780

732

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

781

733

perror_plus("if_indextoname");

782

734

} else {

783

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

784

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

735

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

736

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

785

737

}

786

738

} else {

787

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

788

ip, (uintmax_t)port);

739

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

740

ip, port);

789

741

}

790

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

791

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

744

const char *pcret;

792

745

if(af == AF_INET6){

793

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

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

746

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

747

sizeof(addrstr));

797

748

} else {

798

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

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

749

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

750

sizeof(addrstr));

802

751

}

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);

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

}

809

758

}

810

759

}

811

760

815

764

}

816

765

817

766

if(af == AF_INET6){

818

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

819

sizeof(struct sockaddr_in6));

767

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

820

768

} else {

821

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

822

sizeof(struct sockaddr_in));

769

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

823

770

}

824

771

if(ret < 0){

825

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

772

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

826

773

int e = errno;

827

774

perror_plus("connect");

828

775

errno = e;

874

821

goto mandos_end;

875

822

}

876

823

877

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

878

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

879

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

880

gnutls_transport_set_ptr(session,

881

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

882

826

883

827

if(quit_now){

884

828

errno = EINTR;

989

933

if(buffer_length > 0){

990

934

ssize_t decrypted_buffer_size;

991

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

992

&decrypted_buffer, mc);

936

&decrypted_buffer);

993

937

if(decrypted_buffer_size >= 0){

994

938

995

939

written = 0;

1043

987

return retval;

1044

988

}

1045

989

1046

__attribute__((nonnull))

1047

990

static void resolve_callback(AvahiSServiceResolver *r,

1048

991

AvahiIfIndex interface,

1049

992

AvahiProtocol proto,

1057

1000

AVAHI_GCC_UNUSED AvahiStringList *txt,

1058

1001

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1059

1002

flags,

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1064

1005

1065

1006

/* Called whenever a service has been resolved successfully or

1066

1007

timed out */

1075

1016

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

1076

1017

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

1077

1018

domain,

1078

avahi_strerror(avahi_server_errno

1079

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

1019

avahi_strerror(avahi_server_errno(mc.server)));

1080

1020

break;

1081

1021

1082

1022

case AVAHI_RESOLVER_FOUND:

1088

1028

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

1089

1029

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

1090

1030

}

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1095

1033

if(ret == 0){

1096

avahi_simple_poll_quit(simple_poll);

1034

avahi_simple_poll_quit(mc.simple_poll);

1097

1035

} else {

1098

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

1099

avahi_proto_to_af(proto),

1100

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

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1101

1038

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

1102

1039

" list\n", name);

1103

1040

}

1116

1053

const char *domain,

1117

1054

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1118

1055

flags,

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1123

1058

1124

1059

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

1125

1060

is removed from the LAN */

1133

1068

case AVAHI_BROWSER_FAILURE:

1134

1069

1135

1070

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

1136

avahi_strerror(avahi_server_errno

1137

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

1138

avahi_simple_poll_quit(simple_poll);

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1139

1073

return;

1140

1074

1141

1075

case AVAHI_BROWSER_NEW:

1144

1078

the callback function is called the Avahi server will free the

1145

1079

resolver for us. */

1146

1080

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)

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1151

1084

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

1152

1085

" %s\n", name,

1153

avahi_strerror(avahi_server_errno

1154

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

1086

avahi_strerror(avahi_server_errno(mc.server)));

1155

1087

break;

1156

1088

1157

1089

case AVAHI_BROWSER_REMOVE:

1176

1108

signal_received = sig;

1177

1109

int old_errno = errno;

1178

1110

/* set main loop to exit */

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1181

1113

}

1182

1114

errno = old_errno;

1183

1115

}

1184

1116

1185

__attribute__((nonnull, warn_unused_result))

1186

1117

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

1187

1118

int ret;

1188

error_t ret_errno;

1189

1119

1190

1120

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

1191

1121

if(s < 0){

1192

ret_errno = errno;

1193

1122

perror_plus("socket");

1194

errno = ret_errno;

1195

1123

return false;

1196

1124

}

1197

1125

strcpy(ifr->ifr_name, ifname);

1198

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1199

1127

if(ret == -1){

1200

1128

if(debug){

1201

ret_errno = errno;

1202

1129

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1204

1130

}

1205

1131

return false;

1206

1132

}

1207

1133

return true;

1208

1134

}

1209

1135

1210

__attribute__((nonnull, warn_unused_result))

1211

1136

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

1212

1137

1213

1138

/* Reject the loopback device */

1255

1180

* corresponds to an acceptable network device.

1256

1181

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

1257

1182

*/

1258

__attribute__((nonnull, warn_unused_result))

1259

1183

int good_interface(const struct dirent *if_entry){

1260

1184

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

1261

1185

return 0;

1277

1201

}

1278

1202

1279

1203

/*

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))

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1244

}

1245

1314

1246

int notdotentries(const struct dirent *direntry){

1315

1247

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

1316

1248

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

1323

1255

}

1324

1256

1325

1257

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

1326

__attribute__((nonnull, warn_unused_result))

1327

1258

int runnable_hook(const struct dirent *direntry){

1328

1259

int ret;

1329

1260

size_t sret;

1337

1268

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

1338

1269

"abcdefghijklmnopqrstuvwxyz"

1339

1270

"0123456789"

1340

"_.-");

1271

"_-");

1341

1272

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

1342

1273

/* Contains non-allowed characters */

1343

1274

if(debug){

1347

1278

return 0;

1348

1279

}

1349

1280

1350

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

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1351

1289

if(ret == -1){

1352

1290

if(debug){

1353

1291

perror_plus("Could not stat hook");

1377

1315

return 1;

1378

1316

}

1379

1317

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1383

1319

int ret;

1384

1320

struct timespec now;

1385

1321

struct timespec waited_time;

1386

1322

intmax_t block_time;

1387

1323

1388

1324

while(true){

1389

if(mc->current_server == NULL){

1390

if(debug){

1325

if(mc.current_server == NULL){

1326

if (debug){

1391

1327

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

1392

1328

" No timeout!\n");

1393

1329

}

1394

1330

ret = avahi_simple_poll_iterate(s, -1);

1395

1331

} else {

1396

if(debug){

1332

if (debug){

1397

1333

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

1398

1334

" it, or wait\n");

1399

1335

}

1406

1342

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

1407

1343

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

1408

1344

waited_time.tv_sec = (now.tv_sec

1409

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

1345

- mc.current_server->last_seen.tv_sec);

1410

1346

waited_time.tv_nsec = (now.tv_nsec

1411

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

1347

- mc.current_server->last_seen.tv_nsec);

1412

1348

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

1413

1349

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

1414

1350

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

1416

1352

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

1417

1353

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

1418

1354

1419

if(debug){

1355

if (debug){

1420

1356

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

1421

1357

block_time);

1422

1358

}

1423

1359

1424

1360

if(block_time <= 0){

1425

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

1426

mc->current_server->port,

1427

mc->current_server->if_index,

1428

mc->current_server->af, mc);

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

1429

1365

if(ret == 0){

1430

avahi_simple_poll_quit(s);

1366

avahi_simple_poll_quit(mc.simple_poll);

1431

1367

return 0;

1432

1368

}

1433

1369

ret = clock_gettime(CLOCK_MONOTONIC,

1434

&mc->current_server->last_seen);

1370

&mc.current_server->last_seen);

1435

1371

if(ret == -1){

1436

1372

perror_plus("clock_gettime");

1437

1373

return -1;

1438

1374

}

1439

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

1375

mc.current_server = mc.current_server->next;

1440

1376

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

1441

1377

servers, but don't block */

1442

1378

}

1444

1380

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

1445

1381

}

1446

1382

if(ret != 0){

1447

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

1383

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

1448

1384

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

1449

1385

}

1450

1386

}

1451

1387

}

1452

1388

}

1453

1389

1454

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

1455

__attribute__((warn_unused_result))

1456

error_t raise_privileges(void){

1457

error_t old_errno = errno;

1458

error_t ret_errno = 0;

1459

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

1460

ret_errno = errno;

1461

}

1462

errno = old_errno;

1463

return ret_errno;

1464

}

1465

1466

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

1467

__attribute__((warn_unused_result))

1468

error_t raise_privileges_permanently(void){

1469

error_t old_errno = errno;

1470

error_t ret_errno = raise_privileges();

1471

if(ret_errno != 0){

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

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

1476

ret_errno = errno;

1477

}

1478

errno = old_errno;

1479

return ret_errno;

1480

}

1481

1482

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

1483

__attribute__((warn_unused_result))

1484

error_t lower_privileges(void){

1485

error_t old_errno = errno;

1486

error_t ret_errno = 0;

1487

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

1488

ret_errno = errno;

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,

1390

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

1508

1391

const float delay){

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__ */

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1536

1397

if(numhooks == -1){

1537

1398

perror_plus("scandir");

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){

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

1610

1406

perror_plus("asprintf");

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

1615

1475

free(delaystring);

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;

1659

} else {

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);

1677

}

1678

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;

1683

int ret;

1684

struct ifreq network;

1685

unsigned int if_index = if_nametoindex(interface);

1686

if(if_index == 0){

1687

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

1688

errno = old_errno;

1689

return ENXIO;

1690

}

1691

1692

if(quit_now){

1693

errno = old_errno;

1694

return EINTR;

1695

}

1696

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));

1774

if(ret == -1){

1775

perror_plus("close");

1776

}

1777

1778

if(ret_setflags == -1){

1779

errno = ioctl_errno;

1780

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1781

errno = old_errno;

1782

return ioctl_errno;

1783

}

1784

} else if(debug){

1785

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

1786

interface);

1787

}

1788

1789

/* Sleep checking until interface is running.

1790

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

1791

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

1792

if(interface_is_running(interface)){

1793

break;

1794

}

1795

struct timespec sleeptime = { .tv_nsec = 250000000 };

1796

ret = nanosleep(&sleeptime, NULL);

1797

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

1798

perror_plus("nanosleep");

1799

}

1800

}

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;

1815

}

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));

1862

if(ret == -1){

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);

1875

}

1876

1877

errno = old_errno;

1878

return 0;

1476

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

1477

perror_plus("execl");

1478

_exit(EXIT_FAILURE);

1479

}

1480

} else {

1481

int status;

1482

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

1483

perror_plus("waitpid");

1484

free(fullname);

1485

continue;

1486

}

1487

if(WIFEXITED(status)){

1488

if(WEXITSTATUS(status) != 0){

1489

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

1490

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

1491

WEXITSTATUS(status));

1492

free(fullname);

1493

continue;

1494

}

1495

} else if(WIFSIGNALED(status)){

1496

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

1497

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

1498

WTERMSIG(status));

1499

free(fullname);

1500

continue;

1501

} else {

1502

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

1503

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

1504

free(fullname);

1505

continue;

1506

}

1507

}

1508

free(fullname);

1509

if(debug){

1510

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

1511

direntry->d_name);

1512

}

1513

}

1514

close(devnull);

1515

}

1516

return true;

1879

1517

}

1880

1518

1881

1519

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 };

1886

1520

AvahiSServiceBrowser *sb = NULL;

1887

error_t ret_errno;

1521

int error;

1888

1522

int ret;

1889

1523

intmax_t tmpmax;

1890

1524

char *tmp;

1891

1525

int exitcode = EXIT_SUCCESS;

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;

1526

const char *interface = "";

1527

struct ifreq network;

1528

int sd = -1;

1529

bool take_down_interface = false;

1530

uid_t uid;

1531

gid_t gid;

1532

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

1533

bool tempdir_created = false;

1897

1534

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1898

1535

const char *seckey = PATHDIR "/" SECKEY;

1899

1536

const char *pubkey = PATHDIR "/" PUBKEY;

1900

char *interfaces_hooks = NULL;

1901

1537

1902

1538

bool gnutls_initialized = false;

1903

1539

bool gpgme_initialized = false;

1965

1601

.group = 2 },

1966

1602

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

1967

1603

.arg = "SECONDS",

1968

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

1604

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

1969

1605

.group = 2 },

1970

1606

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

1971

1607

.arg = "DIR",

1994

1630

connect_to = arg;

1995

1631

break;

1996

1632

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

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

}

1633

interface = arg;

2002

1634

break;

2003

1635

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

2004

1636

seckey = arg;

2081

1713

/* Work around Debian bug #633582:

2082

1714

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

2083

1715

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");

1716

/* Re-raise priviliges */

1717

errno = 0;

1718

ret = seteuid(0);

1719

if(ret == -1){

1720

perror_plus("seteuid");

2089

1721

} else {

2090

1722

struct stat st;

2091

1723

2132

1764

}

2133

1765

2134

1766

/* Lower privileges */

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;

1767

errno = 0;

1768

ret = seteuid(uid);

1769

if(ret == -1){

1770

perror_plus("seteuid");

2156

1771

}

2157

1772

}

2158

1773

}

2159

1774

2160

1775

/* Run network hooks */

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);

1776

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

1777

goto end;

2173

1778

}

2174

1779

2175

1780

if(not debug){

2176

1781

avahi_set_log_function(empty_log);

2177

1782

}

2178

1783

1784

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

1785

struct dirent **direntries;

1786

/* First look for interfaces that are up */

1787

ret = scandir(sys_class_net, &direntries, up_interface,

1788

alphasort);

1789

if(ret == 0){

1790

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

1791

free(direntries);

1792

ret = scandir(sys_class_net, &direntries, good_interface,

1793

alphasort);

1794

}

1795

if(ret >= 1){

1796

/* Pick the first interface returned */

1797

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

1798

if(debug){

1799

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

1800

}

1801

if(interface == NULL){

1802

perror_plus("malloc");

1803

free(direntries);

1804

exitcode = EXIT_FAILURE;

1805

goto end;

1806

}

1807

free(direntries);

1808

} else {

1809

free(direntries);

1810

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

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

}

1815

2179

1816

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

2180

1817

from the signal handler */

2181

1818

/* Initialize the pseudo-RNG for Avahi */

2182

1819

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

2183

simple_poll = avahi_simple_poll_new();

2184

if(simple_poll == NULL){

1820

mc.simple_poll = avahi_simple_poll_new();

1821

if(mc.simple_poll == NULL){

2185

1822

fprintf_plus(stderr,

2186

1823

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

2187

1824

exitcode = EX_UNAVAILABLE;

2251

1888

}

2252

1889

}

2253

1890

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;

1891

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

1892

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

1893

if_index = (AvahiIfIndex) if_nametoindex(interface);

1894

if(if_index == 0){

1895

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

1896

exitcode = EX_UNAVAILABLE;

1897

goto end;

1898

}

1899

1900

if(quit_now){

1901

goto end;

1902

}

1903

1904

/* Re-raise priviliges */

1905

errno = 0;

1906

ret = seteuid(0);

1907

if(ret == -1){

1908

perror_plus("seteuid");

1909

}

1910

1911

#ifdef __linux__

1912

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1913

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

1914

ret = klogctl(8, NULL, 5);

1915

bool restore_loglevel = true;

1916

if(ret == -1){

1917

restore_loglevel = false;

1918

perror_plus("klogctl");

1919

}

1920

#endif /* __linux__ */

1921

1922

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1923

if(sd < 0){

1924

perror_plus("socket");

1925

exitcode = EX_OSERR;

1926

#ifdef __linux__

1927

if(restore_loglevel){

1928

ret = klogctl(7, NULL, 0);

1929

if(ret == -1){

1930

perror_plus("klogctl");

1931

}

1932

}

1933

#endif /* __linux__ */

1934

/* Lower privileges */

1935

errno = 0;

1936

ret = seteuid(uid);

1937

if(ret == -1){

1938

perror_plus("seteuid");

1939

}

1940

goto end;

1941

}

1942

strcpy(network.ifr_name, interface);

1943

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

1944

if(ret == -1){

1945

perror_plus("ioctl SIOCGIFFLAGS");

1946

#ifdef __linux__

1947

if(restore_loglevel){

1948

ret = klogctl(7, NULL, 0);

1949

if(ret == -1){

1950

perror_plus("klogctl");

1951

}

1952

}

1953

#endif /* __linux__ */

1954

exitcode = EX_OSERR;

1955

/* Lower privileges */

1956

errno = 0;

1957

ret = seteuid(uid);

1958

if(ret == -1){

1959

perror_plus("seteuid");

1960

}

1961

goto end;

1962

}

1963

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

1964

network.ifr_flags |= IFF_UP;

1965

take_down_interface = true;

1966

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

1967

if(ret == -1){

1968

take_down_interface = false;

1969

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1970

exitcode = EX_OSERR;

1971

#ifdef __linux__

1972

if(restore_loglevel){

1973

ret = klogctl(7, NULL, 0);

1974

if(ret == -1){

1975

perror_plus("klogctl");

2303

1976

}

2304

1977

}

1978

#endif /* __linux__ */

1979

/* Lower privileges */

1980

errno = 0;

1981

ret = seteuid(uid);

1982

if(ret == -1){

1983

perror_plus("seteuid");

1984

}

1985

goto end;

1986

}

1987

}

1988

/* Sleep checking until interface is running.

1989

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

1990

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

1991

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

1992

if(ret == -1){

1993

perror_plus("ioctl SIOCGIFFLAGS");

1994

} else if(network.ifr_flags & IFF_RUNNING){

2305

1995

break;

2306

1996

}

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);

1997

struct timespec sleeptime = { .tv_nsec = 250000000 };

1998

ret = nanosleep(&sleeptime, NULL);

1999

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

2000

perror_plus("nanosleep");

2001

}

2002

}

2003

if(not take_down_interface){

2004

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

2005

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

2006

if(ret == -1){

2007

perror_plus("close");

2008

}

2009

}

2010

#ifdef __linux__

2011

if(restore_loglevel){

2012

/* Restores kernel loglevel to default */

2013

ret = klogctl(7, NULL, 0);

2014

if(ret == -1){

2015

perror_plus("klogctl");

2016

}

2017

}

2018

#endif /* __linux__ */

2019

/* Lower privileges */

2020

errno = 0;

2021

/* Lower privileges */

2022

ret = seteuid(uid);

2023

if(ret == -1){

2024

perror_plus("seteuid");

2025

}

2334

2026

}

2335

2027

2336

2028

if(quit_now){

2337

2029

goto end;

2338

2030

}

2339

2031

2340

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

2032

ret = init_gnutls_global(pubkey, seckey);

2341

2033

if(ret == -1){

2342

2034

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

2343

2035

exitcode = EX_UNAVAILABLE;

2350

2042

goto end;

2351

2043

}

2352

2044

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){

2045

if(mkdtemp(tempdir) == NULL){

2363

2046

perror_plus("mkdtemp");

2364

2047

goto end;

2365

2048

}

2049

tempdir_created = true;

2366

2050

2367

2051

if(quit_now){

2368

2052

goto end;

2369

2053

}

2370

2054

2371

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

2055

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

2372

2056

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

2373

2057

exitcode = EX_UNAVAILABLE;

2374

2058

goto end;

2384

2068

/* Connect directly, do not use Zeroconf */

2385

2069

/* (Mainly meant for debugging) */

2386

2070

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

2387

2388

2071

if(address == NULL){

2389

2072

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

2390

2073

exitcode = EX_USAGE;

2395

2078

goto end;

2396

2079

}

2397

2080

2398

in_port_t port;

2081

uint16_t port;

2399

2082

errno = 0;

2400

2083

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

2401

2084

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

2402

or tmpmax != (in_port_t)tmpmax){

2085

or tmpmax != (uint16_t)tmpmax){

2403

2086

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

2404

2087

exitcode = EX_USAGE;

2405

2088

goto end;

2406

2089

}

2407

2090

2408

2091

if(quit_now){

2409

2092

goto end;

2410

2093

}

2411

2094

2412

port = (in_port_t)tmpmax;

2095

port = (uint16_t)tmpmax;

2413

2096

*address = '\0';

2414

2097

/* Colon in address indicates IPv6 */

2415

2098

int af;

2431

2114

}

2432

2115

2433

2116

while(not quit_now){

2434

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

2435

&mc);

2117

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

2436

2118

if(quit_now or ret == 0){

2437

2119

break;

2438

2120

}

2440

2122

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

2441

2123

(int)retry_interval);

2442

2124

}

2443

sleep((unsigned int)retry_interval);

2125

sleep((int)retry_interval);

2444

2126

}

2445

2127

2446

if(not quit_now){

2128

if (not quit_now){

2447

2129

exitcode = EXIT_SUCCESS;

2448

2130

}

2449

2131

2464

2146

config.publish_domain = 0;

2465

2147

2466

2148

/* Allocate a new server */

2467

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2468

&config, NULL, NULL, &ret_errno);

2149

mc.server = avahi_server_new(avahi_simple_poll_get

2150

(mc.simple_poll), &config, NULL,

2151

NULL, &error);

2469

2152

2470

2153

/* Free the Avahi configuration data */

2471

2154

avahi_server_config_free(&config);

2474

2157

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

2475

2158

if(mc.server == NULL){

2476

2159

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

2477

avahi_strerror(ret_errno));

2160

avahi_strerror(error));

2478

2161

exitcode = EX_UNAVAILABLE;

2479

2162

goto end;

2480

2163

}

2486

2169

/* Create the Avahi service browser */

2487

2170

sb = avahi_s_service_browser_new(mc.server, if_index,

2488

2171

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2489

NULL, 0, browse_callback,

2490

(void *)&mc);

2172

NULL, 0, browse_callback, NULL);

2491

2173

if(sb == NULL){

2492

2174

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

2493

2175

avahi_strerror(avahi_server_errno(mc.server)));

2504

2186

if(debug){

2505

2187

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

2506

2188

}

2507

2508

ret = avahi_loop_with_timeout(simple_poll,

2509

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

2189

2190

ret = avahi_loop_with_timeout(mc.simple_poll,

2191

(int)(retry_interval * 1000));

2510

2192

if(debug){

2511

2193

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

2512

2194

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

2519

2201

}

2520

2202

2521

2203

/* Cleanup things */

2522

free(mc.interfaces);

2523

2524

2204

if(sb != NULL)

2525

2205

avahi_s_service_browser_free(sb);

2526

2206

2527

2207

if(mc.server != NULL)

2528

2208

avahi_server_free(mc.server);

2529

2209

2530

if(simple_poll != NULL)

2531

avahi_simple_poll_free(simple_poll);

2210

if(mc.simple_poll != NULL)

2211

avahi_simple_poll_free(mc.simple_poll);

2532

2212

2533

2213

if(gnutls_initialized){

2534

2214

gnutls_certificate_free_credentials(mc.cred);

2551

2231

}

2552

2232

}

2553

2233

2554

/* Re-raise privileges */

2234

/* Run network hooks */

2235

run_network_hooks("stop", interface, delay);

2236

2237

/* Re-raise priviliges */

2555

2238

{

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

}

2239

errno = 0;

2240

ret = seteuid(0);

2241

if(ret == -1){

2242

perror_plus("seteuid");

2583

2243

}

2584

2244

2585

ret_errno = lower_privileges_permanently();

2586

if(ret_errno != 0){

2587

errno = ret_errno;

2588

perror_plus("Failed to lower privileges permanently");

2245

/* Take down the network interface */

2246

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

2247

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

2248

if(ret == -1){

2249

perror_plus("ioctl SIOCGIFFLAGS");

2250

} else if(network.ifr_flags & IFF_UP){

2251

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

2252

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

2253

if(ret == -1){

2254

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2255

}

2256

}

2257

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

2258

if(ret == -1){

2259

perror_plus("close");

2260

}

2589

2261

}

2590

2262

}

2591

2592

free(interfaces_to_take_down);

2593

free(interfaces_hooks);

2263

/* Lower privileges permanently */

2264

errno = 0;

2265

ret = setuid(uid);

2266

if(ret == -1){

2267

perror_plus("setuid");

2268

}

2594

2269

2595

2270

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

2596

if(tempdir != NULL){

2271

if(tempdir_created){

2597

2272

struct dirent **direntries = NULL;

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

}

2273

struct dirent *direntry = NULL;

2274

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

2275

alphasort);

2276

if (numentries > 0){

2277

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

2278

direntry = direntries[i];

2279

char *fullname = NULL;

2280

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

2281

direntry->d_name);

2282

if(ret < 0){

2283

perror_plus("asprintf");

2284

continue;

2285

}

2286

ret = remove(fullname);

2287

if(ret == -1){

2288

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

2289

strerror(errno));

2290

}

2291

free(fullname);

2634

2292

}

2635

TEMP_FAILURE_RETRY(close(tempdir_fd));

2293

}

2294

2295

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

2296

free(direntries);

2297

if (numentries == -1){

2298

perror_plus("scandir");

2299

}

2300

ret = rmdir(tempdir);

2301

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

2302

perror_plus("rmdir");

2636

2303

}

2637

2304

}

2638

2305