/mandos/release : revision 237.7.242

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

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

41

42

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

43

stdout, ferror(), remove() */

44

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

43

stdout, ferror() */

44

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

45

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

46

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

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

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

61

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

61

62

*/

62

63

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

63

64

strtoimax() */

64

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

65

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

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program_invocation_short_name */

67

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

73

*/

74

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

75

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

76

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

77

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

76

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

77

unlinkat() */

78

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

78

79

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

79

80

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

80

81

argp_state, struct argp,

88

89

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

89

90

WEXITSTATUS(), WTERMSIG() */

90

91

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

92

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

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() */

91

98

92

99

#ifdef __linux__

93

100

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

135

142

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

136

143

char *connect_to = NULL;

137

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

138

148

139

149

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

140

150

typedef struct server{

141

151

const char *ip;

142

uint16_t port;

152

in_port_t port;

143

153

AvahiIfIndex if_index;

144

154

int af;

145

155

struct timespec last_seen;

149

159

150

160

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

151

161

typedef struct {

152

AvahiSimplePoll *simple_poll;

153

162

AvahiServer *server;

154

163

gnutls_certificate_credentials_t cred;

155

164

unsigned int dh_bits;

157

166

const char *priority;

158

167

gpgme_ctx_t ctx;

159

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

160

171

} mandos_context;

161

172

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 };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

167

175

168

176

sig_atomic_t quit_now = 0;

169

177

int signal_received = 0;

177

185

perror(print_text);

178

186

}

179

187

180

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

188

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

181

189

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

182

190

va_list ap;

183

191

va_start (ap, format);

184

192

185

193

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

186

194

program_invocation_short_name));

187

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

195

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

188

196

}

189

197

190

198

/*

192

200

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

193

201

* "buffer_length" is how much is already used.

194

202

*/

203

__attribute__((nonnull, warn_unused_result))

195

204

size_t incbuffer(char **buffer, size_t buffer_length,

196

205

size_t buffer_capacity){

197

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

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

199

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

200

213

return 0;

201

214

}

215

*buffer = new_buf;

202

216

buffer_capacity += BUFFER_SIZE;

203

217

}

204

218

return buffer_capacity;

205

219

}

206

220

207

221

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

208

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

209

int af){

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

210

225

int ret;

211

226

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

212

227

if(new_server == NULL){

221

236

perror_plus("strdup");

222

237

return false;

223

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

224

244

/* Special case of first server */

225

if (mc.current_server == NULL){

245

if(*current_server == NULL){

226

246

new_server->next = new_server;

227

247

new_server->prev = new_server;

228

mc.current_server = new_server;

229

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

248

*current_server = new_server;

230

249

} else {

231

new_server->next = mc.current_server;

232

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

250

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

251

new_server->next = *current_server;

252

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

233

253

new_server->prev->next = 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;

254

(*current_server)->prev = new_server;

240

255

}

241

256

return true;

242

257

}

244

259

/*

245

260

* Initialize GPGME.

246

261

*/

247

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

248

const char *tempdir){

262

__attribute__((nonnull, warn_unused_result))

263

static bool init_gpgme(const char * const seckey,

264

const char * const pubkey,

265

const char * const tempdir,

266

mandos_context *mc){

249

267

gpgme_error_t rc;

250

268

gpgme_engine_info_t engine_info;

251

269

252

253

270

/*

254

271

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

255

272

*/

256

bool import_key(const char *filename){

273

bool import_key(const char * const filename){

257

274

int ret;

258

275

int fd;

259

276

gpgme_data_t pgp_data;

271

288

return false;

272

289

}

273

290

274

rc = gpgme_op_import(mc.ctx, pgp_data);

291

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

275

292

if(rc != GPG_ERR_NO_ERROR){

276

293

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

277

294

gpgme_strsource(rc), gpgme_strerror(rc));

321

338

}

322

339

323

340

/* Create new GPGME "context" */

324

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

341

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

325

342

if(rc != GPG_ERR_NO_ERROR){

326

343

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

327

344

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

340

357

* Decrypt OpenPGP data.

341

358

* Returns -1 on error

342

359

*/

360

__attribute__((nonnull, warn_unused_result))

343

361

static ssize_t pgp_packet_decrypt(const char *cryptotext,

344

362

size_t crypto_size,

345

char **plaintext){

363

char **plaintext,

364

mandos_context *mc){

346

365

gpgme_data_t dh_crypto, dh_plain;

347

366

gpgme_error_t rc;

348

367

ssize_t ret;

374

393

375

394

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

376

395

data buffer */

377

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

396

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

378

397

if(rc != GPG_ERR_NO_ERROR){

379

398

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

380

399

gpgme_strsource(rc), gpgme_strerror(rc));

381

400

plaintext_length = -1;

382

401

if(debug){

383

402

gpgme_decrypt_result_t result;

384

result = gpgme_op_decrypt_result(mc.ctx);

403

result = gpgme_op_decrypt_result(mc->ctx);

385

404

if(result == NULL){

386

405

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

387

406

} else {

464

483

return plaintext_length;

465

484

}

466

485

467

static const char * safer_gnutls_strerror(int value){

468

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

469

-Wunreachable-code */

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

const char *ret = gnutls_strerror(value);

470

489

if(ret == NULL)

471

490

ret = "(unknown)";

472

491

return ret;

473

492

}

474

493

475

494

/* GnuTLS log function callback */

495

__attribute__((nonnull))

476

496

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

477

497

const char* string){

478

498

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

479

499

}

480

500

501

__attribute__((nonnull, warn_unused_result))

481

502

static int init_gnutls_global(const char *pubkeyfilename,

482

const char *seckeyfilename){

503

const char *seckeyfilename,

504

mandos_context *mc){

483

505

int ret;

484

506

485

507

if(debug){

502

524

}

503

525

504

526

/* OpenPGP credentials */

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

506

528

if(ret != GNUTLS_E_SUCCESS){

507

529

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

508

530

safer_gnutls_strerror(ret));

518

540

}

519

541

520

542

ret = gnutls_certificate_set_openpgp_key_file

521

(mc.cred, pubkeyfilename, seckeyfilename,

543

(mc->cred, pubkeyfilename, seckeyfilename,

522

544

GNUTLS_OPENPGP_FMT_BASE64);

523

545

if(ret != GNUTLS_E_SUCCESS){

524

546

fprintf_plus(stderr,

530

552

}

531

553

532

554

/* GnuTLS server initialization */

533

ret = gnutls_dh_params_init(&mc.dh_params);

555

ret = gnutls_dh_params_init(&mc->dh_params);

534

556

if(ret != GNUTLS_E_SUCCESS){

535

557

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

558

" initialization: %s\n",

537

559

safer_gnutls_strerror(ret));

538

560

goto globalfail;

539

561

}

540

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

562

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

541

563

if(ret != GNUTLS_E_SUCCESS){

542

564

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

543

565

safer_gnutls_strerror(ret));

544

566

goto globalfail;

545

567

}

546

568

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

569

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

548

570

549

571

return 0;

550

572

551

573

globalfail:

552

574

553

gnutls_certificate_free_credentials(mc.cred);

575

gnutls_certificate_free_credentials(mc->cred);

554

576

gnutls_global_deinit();

555

gnutls_dh_params_deinit(mc.dh_params);

577

gnutls_dh_params_deinit(mc->dh_params);

556

578

return -1;

557

579

}

558

580

559

static int init_gnutls_session(gnutls_session_t *session){

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

560

584

int ret;

561

585

/* GnuTLS session creation */

562

586

do {

574

598

{

575

599

const char *err;

576

600

do {

577

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

601

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

578

602

if(quit_now){

579

603

gnutls_deinit(*session);

580

604

return -1;

591

615

592

616

do {

593

617

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

594

mc.cred);

618

mc->cred);

595

619

if(quit_now){

596

620

gnutls_deinit(*session);

597

621

return -1;

607

631

/* ignore client certificate if any. */

608

632

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

609

633

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

611

635

612

636

return 0;

613

637

}

617

641

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

618

642

619

643

/* Called when a Mandos server is found */

620

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

644

__attribute__((nonnull, warn_unused_result))

645

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

621

646

AvahiIfIndex if_index,

622

int af){

647

int af, mandos_context *mc){

623

648

int ret, tcp_sd = -1;

624

649

ssize_t sret;

625

union {

626

struct sockaddr_in in;

627

struct sockaddr_in6 in6;

628

} to;

650

struct sockaddr_storage to;

629

651

char *buffer = NULL;

630

652

char *decrypted_buffer = NULL;

631

653

size_t buffer_length = 0;

655

677

return -1;

656

678

}

657

679

658

ret = init_gnutls_session(&session);

680

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

681

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

682

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

683

bool match = false;

684

{

685

char *interface = NULL;

686

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

687

interface))){

688

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

689

match = true;

690

break;

691

}

692

}

693

}

694

if(not match){

695

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

696

connect to the server */

697

if(debug){

698

char interface[IF_NAMESIZE];

699

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

700

perror_plus("if_indextoname");

701

} else {

702

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

703

" \"%s\"\n",

704

if_indextoname((unsigned int)if_index,

705

interface));

706

}

707

}

708

return -1;

709

}

710

}

711

712

ret = init_gnutls_session(&session, mc);

659

713

if(ret != 0){

660

714

return -1;

661

715

}

662

716

663

717

if(debug){

664

718

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

665

PRIu16 "\n", ip, port);

719

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

666

720

}

667

721

668

722

tcp_sd = socket(pf, SOCK_STREAM, 0);

680

734

681

735

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

682

736

if(af == AF_INET6){

683

to.in6.sin6_family = (sa_family_t)af;

684

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

737

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

738

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

685

739

} else { /* IPv4 */

686

to.in.sin_family = (sa_family_t)af;

687

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

740

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

741

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

688

742

}

689

743

if(ret < 0 ){

690

744

int e = errno;

699

753

goto mandos_end;

700

754

}

701

755

if(af == AF_INET6){

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*/

756

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

757

if(IN6_IS_ADDR_LINKLOCAL

758

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

709

759

if(if_index == AVAHI_IF_UNSPEC){

710

760

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

711

761

" incomplete without a network interface\n");

713

763

goto mandos_end;

714

764

}

715

765

/* Set the network interface number as scope */

716

to.in6.sin6_scope_id = (uint32_t)if_index;

766

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

717

767

}

718

768

} else {

719

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

720

-Wconversion and

721

-Wunreachable-code */

769

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

722

770

}

723

771

724

772

if(quit_now){

732

780

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

733

781

perror_plus("if_indextoname");

734

782

} else {

735

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

736

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

783

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

784

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

737

785

}

738

786

} else {

739

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

740

ip, port);

787

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

788

ip, (uintmax_t)port);

741

789

}

742

790

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

791

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

744

const char *pcret;

745

792

if(af == AF_INET6){

746

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

747

sizeof(addrstr));

793

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

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

748

797

} else {

749

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

750

sizeof(addrstr));

798

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

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

751

802

}

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

}

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);

758

809

}

759

810

}

760

811

764

815

}

765

816

766

817

if(af == AF_INET6){

767

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

818

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

819

sizeof(struct sockaddr_in6));

768

820

} else {

769

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

821

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

822

sizeof(struct sockaddr_in));

770

823

}

771

824

if(ret < 0){

772

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

825

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

773

826

int e = errno;

774

827

perror_plus("connect");

775

828

errno = e;

821

874

goto mandos_end;

822

875

}

823

876

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

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);

826

882

827

883

if(quit_now){

828

884

errno = EINTR;

933

989

if(buffer_length > 0){

934

990

ssize_t decrypted_buffer_size;

935

991

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

936

&decrypted_buffer);

992

&decrypted_buffer, mc);

937

993

if(decrypted_buffer_size >= 0){

938

994

939

995

written = 0;

987

1043

return retval;

988

1044

}

989

1045

1046

__attribute__((nonnull))

990

1047

static void resolve_callback(AvahiSServiceResolver *r,

991

1048

AvahiIfIndex interface,

992

1049

AvahiProtocol proto,

1000

1057

AVAHI_GCC_UNUSED AvahiStringList *txt,

1001

1058

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1002

1059

flags,

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

1005

1064

1006

1065

/* Called whenever a service has been resolved successfully or

1007

1066

timed out */

1016

1075

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

1017

1076

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

1018

1077

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

1078

avahi_strerror(avahi_server_errno

1079

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

1020

1080

break;

1021

1081

1022

1082

case AVAHI_RESOLVER_FOUND:

1028

1088

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

1029

1089

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

1030

1090

}

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

1033

1095

if(ret == 0){

1034

avahi_simple_poll_quit(mc.simple_poll);

1096

avahi_simple_poll_quit(simple_poll);

1035

1097

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1098

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

1099

avahi_proto_to_af(proto),

1100

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

1038

1101

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

1039

1102

" list\n", name);

1040

1103

}

1053

1116

const char *domain,

1054

1117

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1055

1118

flags,

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

1058

1123

1059

1124

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

1060

1125

is removed from the LAN */

1068

1133

case AVAHI_BROWSER_FAILURE:

1069

1134

1070

1135

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1136

avahi_strerror(avahi_server_errno

1137

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

1138

avahi_simple_poll_quit(simple_poll);

1073

1139

return;

1074

1140

1075

1141

case AVAHI_BROWSER_NEW:

1078

1144

the callback function is called the Avahi server will free the

1079

1145

resolver for us. */

1080

1146

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1147

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

1148

interface, protocol, name, type,

1149

domain, protocol, 0,

1150

resolve_callback, mc) == NULL)

1084

1151

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

1085

1152

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

1153

avahi_strerror(avahi_server_errno

1154

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

1087

1155

break;

1088

1156

1089

1157

case AVAHI_BROWSER_REMOVE:

1108

1176

signal_received = sig;

1109

1177

int old_errno = errno;

1110

1178

/* set main loop to exit */

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1113

1181

}

1114

1182

errno = old_errno;

1115

1183

}

1116

1184

1185

__attribute__((nonnull, warn_unused_result))

1117

1186

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

1118

1187

int ret;

1188

error_t ret_errno;

1119

1189

1120

1190

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

1121

1191

if(s < 0){

1192

ret_errno = errno;

1122

1193

perror_plus("socket");

1194

errno = ret_errno;

1123

1195

return false;

1124

1196

}

1125

1197

strcpy(ifr->ifr_name, ifname);

1126

1198

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

1199

if(ret == -1){

1128

1200

if(debug){

1201

ret_errno = errno;

1129

1202

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1130

1204

}

1131

1205

return false;

1132

1206

}

1133

1207

return true;

1134

1208

}

1135

1209

1210

__attribute__((nonnull, warn_unused_result))

1136

1211

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

1137

1212

1138

1213

/* Reject the loopback device */

1180

1255

* corresponds to an acceptable network device.

1181

1256

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

1182

1257

*/

1258

__attribute__((nonnull, warn_unused_result))

1183

1259

int good_interface(const struct dirent *if_entry){

1184

1260

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

1185

1261

return 0;

1201

1277

}

1202

1278

1203

1279

/*

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

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))

1246

1314

int notdotentries(const struct dirent *direntry){

1247

1315

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

1248

1316

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

1255

1323

}

1256

1324

1257

1325

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

1326

__attribute__((nonnull, warn_unused_result))

1258

1327

int runnable_hook(const struct dirent *direntry){

1259

1328

int ret;

1260

1329

size_t sret;

1268

1337

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

1269

1338

"abcdefghijklmnopqrstuvwxyz"

1270

1339

"0123456789"

1271

"_-");

1340

"_.-");

1272

1341

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

1273

1342

/* Contains non-allowed characters */

1274

1343

if(debug){

1278

1347

return 0;

1279

1348

}

1280

1349

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);

1350

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

1289

1351

if(ret == -1){

1290

1352

if(debug){

1291

1353

perror_plus("Could not stat hook");

1315

1377

return 1;

1316

1378

}

1317

1379

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1319

1383

int ret;

1320

1384

struct timespec now;

1321

1385

struct timespec waited_time;

1322

1386

intmax_t block_time;

1323

1387

1324

1388

while(true){

1325

if(mc.current_server == NULL){

1326

if (debug){

1389

if(mc->current_server == NULL){

1390

if(debug){

1327

1391

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

1328

1392

" No timeout!\n");

1329

1393

}

1330

1394

ret = avahi_simple_poll_iterate(s, -1);

1331

1395

} else {

1332

if (debug){

1396

if(debug){

1333

1397

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

1334

1398

" it, or wait\n");

1335

1399

}

1342

1406

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

1343

1407

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

1344

1408

waited_time.tv_sec = (now.tv_sec

1345

- mc.current_server->last_seen.tv_sec);

1409

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

1346

1410

waited_time.tv_nsec = (now.tv_nsec

1347

- mc.current_server->last_seen.tv_nsec);

1411

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

1348

1412

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

1349

1413

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

1350

1414

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

1352

1416

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

1353

1417

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

1354

1418

1355

if (debug){

1419

if(debug){

1356

1420

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

1357

1421

block_time);

1358

1422

}

1359

1423

1360

1424

if(block_time <= 0){

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);

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);

1365

1429

if(ret == 0){

1366

avahi_simple_poll_quit(mc.simple_poll);

1430

avahi_simple_poll_quit(s);

1367

1431

return 0;

1368

1432

}

1369

1433

ret = clock_gettime(CLOCK_MONOTONIC,

1370

&mc.current_server->last_seen);

1434

&mc->current_server->last_seen);

1371

1435

if(ret == -1){

1372

1436

perror_plus("clock_gettime");

1373

1437

return -1;

1374

1438

}

1375

mc.current_server = mc.current_server->next;

1439

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

1376

1440

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

1377

1441

servers, but don't block */

1378

1442

}

1380

1444

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

1381

1445

}

1382

1446

if(ret != 0){

1383

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

1447

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

1384

1448

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

1385

1449

}

1386

1450

}

1387

1451

}

1388

1452

}

1389

1453

1390

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

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

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

__attribute__((warn_unused_result))

1469

error_t raise_privileges_permanently(void){

1470

error_t old_errno = errno;

1471

error_t ret_errno = raise_privileges();

1472

if(ret_errno != 0){

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

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

1477

ret_errno = errno;

1478

perror_plus("seteuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

__attribute__((warn_unused_result))

1486

error_t lower_privileges(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("seteuid");

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

perror_plus("setuid");

1505

}

1506

errno = old_errno;

1507

return ret_errno;

1508

}

1509

1510

#ifndef O_CLOEXEC

1511

/*

1512

* Based on the example in the GNU LibC manual chapter 13.13 "File

1513

* Descriptor Flags".

1514

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

1515

*/

1516

__attribute__((warn_unused_result))

1517

static int set_cloexec_flag(int fd){

1518

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

1519

/* If reading the flags failed, return error indication now. */

1520

if(ret < 0){

1521

return ret;

1522

}

1523

/* Store modified flag word in the descriptor. */

1524

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

1525

ret | FD_CLOEXEC));

1526

}

1527

#endif /* not O_CLOEXEC */

1528

1529

__attribute__((nonnull))

1530

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

1391

1531

const float delay){

1392

1532

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1533

if(hookdir_fd == -1){

1534

hookdir_fd = open(hookdir, O_RDONLY |

1535

#ifdef O_CLOEXEC

1536

O_CLOEXEC

1537

#else /* not O_CLOEXEC */

1538

0

1539

#endif /* not O_CLOEXEC */

1540

);

1541

if(hookdir_fd == -1){

1542

if(errno == ENOENT){

1543

if(debug){

1544

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

1545

" found\n", hookdir);

1546

}

1547

} else {

1548

perror_plus("open");

1549

}

1550

return;

1551

}

1552

#ifndef O_CLOEXEC

1553

if(set_cloexec_flag(hookdir_fd) < 0){

1554

perror_plus("set_cloexec_flag");

1555

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

1556

perror_plus("close");

1557

} else {

1558

hookdir_fd = -1;

1559

}

1560

return;

1561

}

1562

#endif /* not O_CLOEXEC */

1563

}

1564

#ifdef __GLIBC__

1565

#if __GLIBC_PREREQ(2, 15)

1566

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

1567

runnable_hook, alphasort);

1568

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

1569

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

1570

alphasort);

1571

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

1572

#else /* not __GLIBC__ */

1573

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

1574

alphasort);

1575

#endif /* not __GLIBC__ */

1397

1576

if(numhooks == -1){

1398

1577

perror_plus("scandir");

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){

1578

return;

1579

}

1580

struct dirent *direntry;

1581

int ret;

1582

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

1583

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

1584

direntry = direntries[i];

1585

if(debug){

1586

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

1587

direntry->d_name);

1588

}

1589

pid_t hook_pid = fork();

1590

if(hook_pid == 0){

1591

/* Child */

1592

/* Raise privileges */

1593

if(raise_privileges_permanently() != 0){

1594

perror_plus("Failed to raise privileges");

1595

_exit(EX_NOPERM);

1596

}

1597

/* Set group */

1598

errno = 0;

1599

ret = setgid(0);

1600

if(ret == -1){

1601

perror_plus("setgid");

1602

_exit(EX_NOPERM);

1603

}

1604

/* Reset supplementary groups */

1605

errno = 0;

1606

ret = setgroups(0, NULL);

1607

if(ret == -1){

1608

perror_plus("setgroups");

1609

_exit(EX_NOPERM);

1610

}

1611

ret = dup2(devnull, STDIN_FILENO);

1612

if(ret == -1){

1613

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

1614

_exit(EX_OSERR);

1615

}

1616

ret = close(devnull);

1617

if(ret == -1){

1618

perror_plus("close");

1619

_exit(EX_OSERR);

1620

}

1621

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1622

if(ret == -1){

1623

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

1624

_exit(EX_OSERR);

1625

}

1626

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

1627

if(ret == -1){

1628

perror_plus("setenv");

1629

_exit(EX_OSERR);

1630

}

1631

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

1632

if(ret == -1){

1633

perror_plus("setenv");

1634

_exit(EX_OSERR);

1635

}

1636

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

1637

if(ret == -1){

1638

perror_plus("setenv");

1639

_exit(EX_OSERR);

1640

}

1641

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

1642

if(ret == -1){

1643

perror_plus("setenv");

1644

_exit(EX_OSERR);

1645

}

1646

char *delaystring;

1647

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

1648

if(ret == -1){

1406

1649

perror_plus("asprintf");

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("VERBOSITY", 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

}

1650

_exit(EX_OSERR);

1651

}

1652

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

1653

if(ret == -1){

1475

1654

free(delaystring);

1476

if(connect_to != NULL){

1477

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

1478

if(ret == -1){

1479

perror_plus("setenv");

1480

_exit(EX_OSERR);

1481

}

1482

}

1483

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

1484

perror_plus("execl");

1485

_exit(EXIT_FAILURE);

1486

}

1487

} else {

1488

int status;

1489

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

1490

perror_plus("waitpid");

1491

free(fullname);

1492

continue;

1493

}

1494

if(WIFEXITED(status)){

1495

if(WEXITSTATUS(status) != 0){

1496

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

1497

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

1498

WEXITSTATUS(status));

1499

free(fullname);

1500

continue;

1501

}

1502

} else if(WIFSIGNALED(status)){

1503

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

1504

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

1505

WTERMSIG(status));

1506

free(fullname);

1507

continue;

1508

} else {

1509

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

1510

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

1511

free(fullname);

1512

continue;

1513

}

1514

}

1515

free(fullname);

1516

if(debug){

1517

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

1518

direntry->d_name);

1519

}

1520

}

1521

close(devnull);

1522

}

1523

return true;

1655

perror_plus("setenv");

1656

_exit(EX_OSERR);

1657

}

1658

free(delaystring);

1659

if(connect_to != NULL){

1660

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

1661

if(ret == -1){

1662

perror_plus("setenv");

1663

_exit(EX_OSERR);

1664

}

1665

}

1666

if(fexecve(hookdir_fd, (char *const [])

1667

{ direntry->d_name, NULL }, environ) == -1){

1668

perror_plus("fexecve");

1669

_exit(EXIT_FAILURE);

1670

}

1671

} else {

1672

int status;

1673

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

1674

perror_plus("waitpid");

1675

continue;

1676

}

1677

if(WIFEXITED(status)){

1678

if(WEXITSTATUS(status) != 0){

1679

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

1680

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

1681

WEXITSTATUS(status));

1682

continue;

1683

}

1684

} else if(WIFSIGNALED(status)){

1685

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

1686

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

1687

WTERMSIG(status));

1688

continue;

1689

} else {

1690

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

1691

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

1692

continue;

1693

}

1694

}

1695

if(debug){

1696

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

1697

direntry->d_name);

1698

}

1699

}

1700

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

1701

perror_plus("close");

1702

} else {

1703

hookdir_fd = -1;

1704

}

1705

close(devnull);

1706

}

1707

1708

__attribute__((nonnull, warn_unused_result))

1709

error_t bring_up_interface(const char *const interface,

1710

const float delay){

1711

error_t old_errno = errno;

1712

int ret;

1713

struct ifreq network;

1714

unsigned int if_index = if_nametoindex(interface);

1715

if(if_index == 0){

1716

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

1717

errno = old_errno;

1718

return ENXIO;

1719

}

1720

1721

if(quit_now){

1722

errno = old_errno;

1723

return EINTR;

1724

}

1725

1726

if(not interface_is_up(interface)){

1727

error_t ret_errno = 0, ioctl_errno = 0;

1728

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

1729

ret_errno = errno;

1730

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

1731

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

1732

errno = old_errno;

1733

return ret_errno;

1734

}

1735

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

1736

1737

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

1738

if(sd == -1){

1739

ret_errno = errno;

1740

perror_plus("socket");

1741

errno = old_errno;

1742

return ret_errno;

1743

}

1744

1745

if(quit_now){

1746

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

1747

if(ret == -1){

1748

perror_plus("close");

1749

}

1750

errno = old_errno;

1751

return EINTR;

1752

}

1753

1754

if(debug){

1755

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

1756

interface);

1757

}

1758

1759

/* Raise privileges */

1760

ret_errno = raise_privileges();

1761

if(ret_errno != 0){

1762

perror_plus("Failed to raise privileges");

1763

}

1764

1765

#ifdef __linux__

1766

int ret_linux;

1767

bool restore_loglevel = false;

1768

if(ret_errno == 0){

1769

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1770

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

1771

ret_linux = klogctl(8, NULL, 5);

1772

if(ret_linux == -1){

1773

perror_plus("klogctl");

1774

} else {

1775

restore_loglevel = true;

1776

}

1777

}

1778

#endif /* __linux__ */

1779

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

1780

ioctl_errno = errno;

1781

#ifdef __linux__

1782

if(restore_loglevel){

1783

ret_linux = klogctl(7, NULL, 0);

1784

if(ret_linux == -1){

1785

perror_plus("klogctl");

1786

}

1787

}

1788

#endif /* __linux__ */

1789

1790

/* If raise_privileges() succeeded above */

1791

if(ret_errno == 0){

1792

/* Lower privileges */

1793

ret_errno = lower_privileges();

1794

if(ret_errno != 0){

1795

errno = ret_errno;

1796

perror_plus("Failed to lower privileges");

1797

}

1798

}

1799

1800

/* Close the socket */

1801

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

1802

if(ret == -1){

1803

perror_plus("close");

1804

}

1805

1806

if(ret_setflags == -1){

1807

errno = ioctl_errno;

1808

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1809

errno = old_errno;

1810

return ioctl_errno;

1811

}

1812

} else if(debug){

1813

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

1814

interface);

1815

}

1816

1817

/* Sleep checking until interface is running.

1818

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

1819

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

1820

if(interface_is_running(interface)){

1821

break;

1822

}

1823

struct timespec sleeptime = { .tv_nsec = 250000000 };

1824

ret = nanosleep(&sleeptime, NULL);

1825

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

1826

perror_plus("nanosleep");

1827

}

1828

}

1829

1830

errno = old_errno;

1831

return 0;

1832

}

1833

1834

__attribute__((nonnull, warn_unused_result))

1835

error_t take_down_interface(const char *const interface){

1836

error_t old_errno = errno;

1837

struct ifreq network;

1838

unsigned int if_index = if_nametoindex(interface);

1839

if(if_index == 0){

1840

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

1841

errno = old_errno;

1842

return ENXIO;

1843

}

1844

if(interface_is_up(interface)){

1845

error_t ret_errno = 0, ioctl_errno = 0;

1846

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

1847

ret_errno = errno;

1848

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

1849

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

1850

errno = old_errno;

1851

return ret_errno;

1852

}

1853

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

1854

1855

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

1856

if(sd == -1){

1857

ret_errno = errno;

1858

perror_plus("socket");

1859

errno = old_errno;

1860

return ret_errno;

1861

}

1862

1863

if(debug){

1864

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

1865

interface);

1866

}

1867

1868

/* Raise privileges */

1869

ret_errno = raise_privileges();

1870

if(ret_errno != 0){

1871

perror_plus("Failed to raise privileges");

1872

}

1873

1874

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

1875

ioctl_errno = errno;

1876

1877

/* If raise_privileges() succeeded above */

1878

if(ret_errno == 0){

1879

/* Lower privileges */

1880

ret_errno = lower_privileges();

1881

if(ret_errno != 0){

1882

errno = ret_errno;

1883

perror_plus("Failed to lower privileges");

1884

}

1885

}

1886

1887

/* Close the socket */

1888

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

1889

if(ret == -1){

1890

perror_plus("close");

1891

}

1892

1893

if(ret_setflags == -1){

1894

errno = ioctl_errno;

1895

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1896

errno = old_errno;

1897

return ioctl_errno;

1898

}

1899

} else if(debug){

1900

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

1901

interface);

1902

}

1903

1904

errno = old_errno;

1905

return 0;

1524

1906

}

1525

1907

1526

1908

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

1909

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

1910

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

1911

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

1912

.interfaces = NULL, .interfaces_size = 0 };

1527

1913

AvahiSServiceBrowser *sb = NULL;

1528

int error;

1914

error_t ret_errno;

1529

1915

int ret;

1530

1916

intmax_t tmpmax;

1531

1917

char *tmp;

1532

1918

int exitcode = EXIT_SUCCESS;

1533

const char *interface = "";

1534

struct ifreq network;

1535

int sd = -1;

1536

bool take_down_interface = false;

1537

uid_t uid;

1538

gid_t gid;

1539

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

1540

bool tempdir_created = false;

1919

char *interfaces_to_take_down = NULL;

1920

size_t interfaces_to_take_down_size = 0;

1921

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

1922

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

1923

char *tempdir = NULL;

1541

1924

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1542

1925

const char *seckey = PATHDIR "/" SECKEY;

1543

1926

const char *pubkey = PATHDIR "/" PUBKEY;

1927

char *interfaces_hooks = NULL;

1544

1928

1545

1929

bool gnutls_initialized = false;

1546

1930

bool gpgme_initialized = false;

1637

2021

connect_to = arg;

1638

2022

break;

1639

2023

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

1640

interface = arg;

2024

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

2025

arg, (int)',');

2026

if(ret_errno != 0){

2027

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

2028

}

1641

2029

break;

1642

2030

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

1643

2031

seckey = arg;

1720

2108

/* Work around Debian bug #633582:

1721

2109

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

1722

2110

1723

/* Re-raise priviliges */

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

2111

/* Re-raise privileges */

2112

ret_errno = raise_privileges();

2113

if(ret_errno != 0){

2114

errno = ret_errno;

2115

perror_plus("Failed to raise privileges");

1728

2116

} else {

1729

2117

struct stat st;

1730

2118

1771

2159

}

1772

2160

1773

2161

/* Lower privileges */

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

2162

ret_errno = lower_privileges();

2163

if(ret_errno != 0){

2164

errno = ret_errno;

2165

perror_plus("Failed to lower privileges");

2166

}

2167

}

2168

}

2169

2170

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

2171

{

2172

char *interface = NULL;

2173

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

2174

interface))){

2175

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

2176

and if_nametoindex(interface) == 0){

2177

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

2178

fprintf_plus(stderr, "Not using nonexisting interface"

2179

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

2180

}

2181

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

2182

interface = NULL;

1778

2183

}

1779

2184

}

1780

2185

}

1781

2186

1782

2187

/* Run network hooks */

1783

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

1784

goto end;

2188

{

2189

if(mc.interfaces != NULL){

2190

interfaces_hooks = malloc(mc.interfaces_size);

2191

if(interfaces_hooks == NULL){

2192

perror_plus("malloc");

2193

goto end;

2194

}

2195

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

2196

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

2197

}

2198

run_network_hooks("start", interfaces_hooks != NULL ?

2199

interfaces_hooks : "", delay);

1785

2200

}

1786

2201

1787

2202

if(not debug){

1788

2203

avahi_set_log_function(empty_log);

1789

2204

}

1790

2205

1791

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

1792

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1795

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

if(ret >= 1){

1803

/* Pick the first interface returned */

1804

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

1805

if(debug){

1806

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

1807

}

1808

if(interface == NULL){

1809

perror_plus("malloc");

1810

free(direntries);

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

free(direntries);

1815

} else {

1816

free(direntries);

1817

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

1818

exitcode = EXIT_FAILURE;

1819

goto end;

1820

}

1821

}

1822

1823

2206

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

1824

2207

from the signal handler */

1825

2208

/* Initialize the pseudo-RNG for Avahi */

1826

2209

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

1827

mc.simple_poll = avahi_simple_poll_new();

1828

if(mc.simple_poll == NULL){

2210

simple_poll = avahi_simple_poll_new();

2211

if(simple_poll == NULL){

1829

2212

fprintf_plus(stderr,

1830

2213

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

1831

2214

exitcode = EX_UNAVAILABLE;

1895

2278

}

1896

2279

}

1897

2280

1898

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

1899

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

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

if(if_index == 0){

1902

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

1903

exitcode = EX_UNAVAILABLE;

1904

goto end;

1905

}

1906

1907

if(quit_now){

1908

goto end;

1909

}

1910

1911

/* Re-raise priviliges */

1912

errno = 0;

1913

ret = seteuid(0);

1914

if(ret == -1){

1915

perror_plus("seteuid");

1916

}

1917

1918

#ifdef __linux__

1919

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1920

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

1921

ret = klogctl(8, NULL, 5);

1922

bool restore_loglevel = true;

1923

if(ret == -1){

1924

restore_loglevel = false;

1925

perror_plus("klogctl");

1926

}

1927

#endif /* __linux__ */

1928

1929

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1930

if(sd < 0){

1931

perror_plus("socket");

1932

exitcode = EX_OSERR;

1933

#ifdef __linux__

1934

if(restore_loglevel){

1935

ret = klogctl(7, NULL, 0);

1936

if(ret == -1){

1937

perror_plus("klogctl");

1938

}

1939

}

1940

#endif /* __linux__ */

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

strcpy(network.ifr_name, interface);

1950

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

1951

if(ret == -1){

1952

perror_plus("ioctl SIOCGIFFLAGS");

1953

#ifdef __linux__

1954

if(restore_loglevel){

1955

ret = klogctl(7, NULL, 0);

1956

if(ret == -1){

1957

perror_plus("klogctl");

1958

}

1959

}

1960

#endif /* __linux__ */

1961

exitcode = EX_OSERR;

1962

/* Lower privileges */

1963

errno = 0;

1964

ret = seteuid(uid);

1965

if(ret == -1){

1966

perror_plus("seteuid");

1967

}

1968

goto end;

1969

}

1970

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

1971

network.ifr_flags |= IFF_UP;

1972

take_down_interface = true;

1973

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

1974

if(ret == -1){

1975

take_down_interface = false;

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1977

exitcode = EX_OSERR;

1978

#ifdef __linux__

1979

if(restore_loglevel){

1980

ret = klogctl(7, NULL, 0);

1981

if(ret == -1){

1982

perror_plus("klogctl");

2281

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

2282

if(mc.interfaces == NULL){

2283

struct dirent **direntries;

2284

/* Look for any good interfaces */

2285

ret = scandir(sys_class_net, &direntries, good_interface,

2286

alphasort);

2287

if(ret >= 1){

2288

/* Add all found interfaces to interfaces list */

2289

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

2290

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

2291

direntries[i]->d_name);

2292

if(ret_errno != 0){

2293

errno = ret_errno;

2294

perror_plus("argz_add");

2295

continue;

2296

}

2297

if(debug){

2298

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

2299

direntries[i]->d_name);

2300

}

2301

}

2302

free(direntries);

2303

} else {

2304

free(direntries);

2305

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

2306

exitcode = EXIT_FAILURE;

2307

goto end;

2308

}

2309

}

2310

2311

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

2312

{

2313

char *interface = NULL;

2314

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

2315

interface))){

2316

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

2317

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

2318

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

2319

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

2320

interface);

2321

interface = NULL;

2322

while((interface = argz_next(mc.interfaces,

2323

mc.interfaces_size, interface))){

2324

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

2325

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

2326

interface);

2327

interface = NULL;

1983

2328

}

1984

2329

}

1985

#endif /* __linux__ */

1986

/* Lower privileges */

1987

errno = 0;

1988

ret = seteuid(uid);

1989

if(ret == -1){

1990

perror_plus("seteuid");

1991

}

1992

goto end;

1993

}

1994

}

1995

/* Sleep checking until interface is running.

1996

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

1997

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

1998

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

1999

if(ret == -1){

2000

perror_plus("ioctl SIOCGIFFLAGS");

2001

} else if(network.ifr_flags & IFF_RUNNING){

2002

2330

break;

2003

2331

}

2004

struct timespec sleeptime = { .tv_nsec = 250000000 };

2005

ret = nanosleep(&sleeptime, NULL);

2006

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

2007

perror_plus("nanosleep");

2008

}

2009

}

2010

if(not take_down_interface){

2011

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

2012

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

2013

if(ret == -1){

2014

perror_plus("close");

2015

}

2016

}

2017

#ifdef __linux__

2018

if(restore_loglevel){

2019

/* Restores kernel loglevel to default */

2020

ret = klogctl(7, NULL, 0);

2021

if(ret == -1){

2022

perror_plus("klogctl");

2023

}

2024

}

2025

#endif /* __linux__ */

2026

/* Lower privileges */

2027

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

2032

}

2332

bool interface_was_up = interface_is_up(interface);

2333

errno = bring_up_interface(interface, delay);

2334

if(not interface_was_up){

2335

if(errno != 0){

2336

perror_plus("Failed to bring up interface");

2337

} else {

2338

errno = argz_add(&interfaces_to_take_down,

2339

&interfaces_to_take_down_size,

2340

interface);

2341

if(errno != 0){

2342

perror_plus("argz_add");

2343

}

2344

}

2345

}

2346

}

2347

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

2348

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

2349

}

2350

}

2351

2352

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

2353

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

2354

if(debug){

2355

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

2356

mc.interfaces);

2357

}

2358

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

2033

2359

}

2034

2360

2035

2361

if(quit_now){

2036

2362

goto end;

2037

2363

}

2038

2364

2039

ret = init_gnutls_global(pubkey, seckey);

2365

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

2040

2366

if(ret == -1){

2041

2367

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

2042

2368

exitcode = EX_UNAVAILABLE;

2049

2375

goto end;

2050

2376

}

2051

2377

2052

if(mkdtemp(tempdir) == NULL){

2378

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

2379

tempdir = mkdtemp(run_tempdir);

2380

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

2381

if(debug){

2382

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

2383

run_tempdir, old_tempdir);

2384

}

2385

tempdir = mkdtemp(old_tempdir);

2386

}

2387

if(tempdir == NULL){

2053

2388

perror_plus("mkdtemp");

2054

2389

goto end;

2055

2390

}

2056

tempdir_created = true;

2057

2391

2058

2392

if(quit_now){

2059

2393

goto end;

2060

2394

}

2061

2395

2062

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

2396

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

2063

2397

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

2064

2398

exitcode = EX_UNAVAILABLE;

2065

2399

goto end;

2075

2409

/* Connect directly, do not use Zeroconf */

2076

2410

/* (Mainly meant for debugging) */

2077

2411

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

2412

2078

2413

if(address == NULL){

2079

2414

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

2080

2415

exitcode = EX_USAGE;

2085

2420

goto end;

2086

2421

}

2087

2422

2088

uint16_t port;

2423

in_port_t port;

2089

2424

errno = 0;

2090

2425

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

2091

2426

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

2092

or tmpmax != (uint16_t)tmpmax){

2427

or tmpmax != (in_port_t)tmpmax){

2093

2428

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

2094

2429

exitcode = EX_USAGE;

2095

2430

goto end;

2096

2431

}

2097

2432

2098

2433

if(quit_now){

2099

2434

goto end;

2100

2435

}

2101

2436

2102

port = (uint16_t)tmpmax;

2437

port = (in_port_t)tmpmax;

2103

2438

*address = '\0';

2104

2439

/* Colon in address indicates IPv6 */

2105

2440

int af;

2121

2456

}

2122

2457

2123

2458

while(not quit_now){

2124

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

2459

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

2460

&mc);

2125

2461

if(quit_now or ret == 0){

2126

2462

break;

2127

2463

}

2129

2465

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

2130

2466

(int)retry_interval);

2131

2467

}

2132

sleep((int)retry_interval);

2468

sleep((unsigned int)retry_interval);

2133

2469

}

2134

2470

2135

if (not quit_now){

2471

if(not quit_now){

2136

2472

exitcode = EXIT_SUCCESS;

2137

2473

}

2138

2474

2153

2489

config.publish_domain = 0;

2154

2490

2155

2491

/* Allocate a new server */

2156

mc.server = avahi_server_new(avahi_simple_poll_get

2157

(mc.simple_poll), &config, NULL,

2158

NULL, &error);

2492

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2493

&config, NULL, NULL, &ret_errno);

2159

2494

2160

2495

/* Free the Avahi configuration data */

2161

2496

avahi_server_config_free(&config);

2164

2499

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

2165

2500

if(mc.server == NULL){

2166

2501

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

2167

avahi_strerror(error));

2502

avahi_strerror(ret_errno));

2168

2503

exitcode = EX_UNAVAILABLE;

2169

2504

goto end;

2170

2505

}

2176

2511

/* Create the Avahi service browser */

2177

2512

sb = avahi_s_service_browser_new(mc.server, if_index,

2178

2513

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2179

NULL, 0, browse_callback, NULL);

2514

NULL, 0, browse_callback,

2515

(void *)&mc);

2180

2516

if(sb == NULL){

2181

2517

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

2182

2518

avahi_strerror(avahi_server_errno(mc.server)));

2193

2529

if(debug){

2194

2530

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

2195

2531

}

2196

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

2532

2533

ret = avahi_loop_with_timeout(simple_poll,

2534

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

2199

2535

if(debug){

2200

2536

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

2201

2537

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

2208

2544

}

2209

2545

2210

2546

/* Cleanup things */

2547

free(mc.interfaces);

2548

2211

2549

if(sb != NULL)

2212

2550

avahi_s_service_browser_free(sb);

2213

2551

2214

2552

if(mc.server != NULL)

2215

2553

avahi_server_free(mc.server);

2216

2554

2217

if(mc.simple_poll != NULL)

2218

avahi_simple_poll_free(mc.simple_poll);

2555

if(simple_poll != NULL)

2556

avahi_simple_poll_free(simple_poll);

2219

2557

2220

2558

if(gnutls_initialized){

2221

2559

gnutls_certificate_free_credentials(mc.cred);

2238

2576

}

2239

2577

}

2240

2578

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2244

/* Re-raise priviliges */

2579

/* Re-raise privileges */

2245

2580

{

2246

errno = 0;

2247

ret = seteuid(0);

2248

if(ret == -1){

2249

perror_plus("seteuid");

2581

ret_errno = raise_privileges();

2582

if(ret_errno != 0){

2583

perror_plus("Failed to raise privileges");

2584

} else {

2585

2586

/* Run network hooks */

2587

run_network_hooks("stop", interfaces_hooks != NULL ?

2588

interfaces_hooks : "", delay);

2589

2590

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

2591

{

2592

char *interface = NULL;

2593

while((interface=argz_next(interfaces_to_take_down,

2594

interfaces_to_take_down_size,

2595

interface))){

2596

ret_errno = take_down_interface(interface);

2597

if(ret_errno != 0){

2598

errno = ret_errno;

2599

perror_plus("Failed to take down interface");

2600

}

2601

}

2602

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

2603

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

2604

" down\n");

2605

}

2606

}

2250

2607

}

2251

2608

2252

/* Take down the network interface */

2253

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

2254

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

2255

if(ret == -1){

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

2258

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

2259

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

2260

if(ret == -1){

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2262

}

2263

}

2264

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

2265

if(ret == -1){

2266

perror_plus("close");

2267

}

2609

ret_errno = lower_privileges_permanently();

2610

if(ret_errno != 0){

2611

perror_plus("Failed to lower privileges permanently");

2268

2612

}

2269

2613

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2614

2615

free(interfaces_to_take_down);

2616

free(interfaces_hooks);

2276

2617

2277

2618

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

2278

if(tempdir_created){

2619

if(tempdir != NULL){

2279

2620

struct dirent **direntries = NULL;

2280

struct dirent *direntry = NULL;

2281

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

2282

alphasort);

2283

if (numentries > 0){

2284

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

2285

direntry = direntries[i];

2286

char *fullname = NULL;

2287

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

2288

direntry->d_name);

2289

if(ret < 0){

2290

perror_plus("asprintf");

2291

continue;

2292

}

2293

ret = remove(fullname);

2294

if(ret == -1){

2295

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

2296

strerror(errno));

2297

}

2298

free(fullname);

2621

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

2622

if(tempdir_fd == -1){

2623

perror_plus("open");

2624

} else {

2625

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

2626

alphasort);

2627

if(numentries > 0){

2628

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

2629

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

2630

if(ret == -1){

2631

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

2632

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

2633

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

2634

}

2635

}

2636

2637

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

2638

free(direntries);

2639

if(numentries == -1){

2640

perror_plus("scandir");

2641

}

2642

ret = rmdir(tempdir);

2643

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

2644

perror_plus("rmdir");

2645

}

2299

2646

}

2300

}

2301

2302

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

2303

free(direntries);

2304

if (numentries == -1){

2305

perror_plus("scandir");

2306

}

2307

ret = rmdir(tempdir);

2308

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

2309

perror_plus("rmdir");

2647

TEMP_FAILURE_RETRY(close(tempdir_fd));

2310

2648

}

2311

2649

}

2312

2650