/mandos/release : revision 237.7.142

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

41

42

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

43

stdout, ferror() */

43

stdout, ferror(), remove() */

44

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

45

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

46

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

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

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inet_pton(), connect() */

59

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

61

60

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

62

61

*/

63

62

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

64

63

strtoimax() */

64

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

65

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

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program_invocation_short_name */

67

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

73

*/

74

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

75

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

76

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

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unlinkat() */

78

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

76

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

77

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

79

78

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

80

79

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

81

80

argp_state, struct argp,

89

88

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

90

89

WEXITSTATUS(), WTERMSIG() */

91

90

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

92

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

93

argz_delete(), argz_append(),

94

argz_stringify(), argz_add(),

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

98

91

99

92

#ifdef __linux__

100

93

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

142

135

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

143

136

char *connect_to = NULL;

144

137

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

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;

989

936

if(buffer_length > 0){

990

937

ssize_t decrypted_buffer_size;

991

938

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

992

&decrypted_buffer, mc);

939

&decrypted_buffer);

993

940

if(decrypted_buffer_size >= 0){

994

941

995

942

written = 0;

1043

990

return retval;

1044

991

}

1045

992

1046

__attribute__((nonnull))

1047

993

static void resolve_callback(AvahiSServiceResolver *r,

1048

994

AvahiIfIndex interface,

1049

995

AvahiProtocol proto,

1057

1003

AVAHI_GCC_UNUSED AvahiStringList *txt,

1058

1004

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1059

1005

flags,

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

1006

AVAHI_GCC_UNUSED void* userdata){

1007

assert(r);

1064

1008

1065

1009

/* Called whenever a service has been resolved successfully or

1066

1010

timed out */

1075

1019

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

1076

1020

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

1077

1021

domain,

1078

avahi_strerror(avahi_server_errno

1079

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

1022

avahi_strerror(avahi_server_errno(mc.server)));

1080

1023

break;

1081

1024

1082

1025

case AVAHI_RESOLVER_FOUND:

1088

1031

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

1089

1032

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

1090

1033

}

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

1034

int ret = start_mandos_communication(ip, port, interface,

1035

avahi_proto_to_af(proto));

1095

1036

if(ret == 0){

1096

avahi_simple_poll_quit(simple_poll);

1037

avahi_simple_poll_quit(mc.simple_poll);

1097

1038

} else {

1098

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

1099

avahi_proto_to_af(proto),

1100

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

1039

if(not add_server(ip, port, interface,

1040

avahi_proto_to_af(proto))){

1101

1041

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

1102

1042

" list\n", name);

1103

1043

}

1116

1056

const char *domain,

1117

1057

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1118

1058

flags,

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

1059

AVAHI_GCC_UNUSED void* userdata){

1060

assert(b);

1123

1061

1124

1062

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

1125

1063

is removed from the LAN */

1133

1071

case AVAHI_BROWSER_FAILURE:

1134

1072

1135

1073

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);

1074

avahi_strerror(avahi_server_errno(mc.server)));

1075

avahi_simple_poll_quit(mc.simple_poll);

1139

1076

return;

1140

1077

1141

1078

case AVAHI_BROWSER_NEW:

1144

1081

the callback function is called the Avahi server will free the

1145

1082

resolver for us. */

1146

1083

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

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

1085

name, type, domain, protocol, 0,

1086

resolve_callback, NULL) == NULL)

1151

1087

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

1152

1088

" %s\n", name,

1153

avahi_strerror(avahi_server_errno

1154

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

1089

avahi_strerror(avahi_server_errno(mc.server)));

1155

1090

break;

1156

1091

1157

1092

case AVAHI_BROWSER_REMOVE:

1176

1111

signal_received = sig;

1177

1112

int old_errno = errno;

1178

1113

/* set main loop to exit */

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1114

if(mc.simple_poll != NULL){

1115

avahi_simple_poll_quit(mc.simple_poll);

1181

1116

}

1182

1117

errno = old_errno;

1183

1118

}

1184

1119

1185

__attribute__((nonnull, warn_unused_result))

1186

1120

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

1187

1121

int ret;

1188

error_t ret_errno;

1189

1122

1190

1123

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

1191

1124

if(s < 0){

1192

ret_errno = errno;

1193

1125

perror_plus("socket");

1194

errno = ret_errno;

1195

1126

return false;

1196

1127

}

1197

1128

strcpy(ifr->ifr_name, ifname);

1198

1129

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1199

1130

if(ret == -1){

1200

1131

if(debug){

1201

ret_errno = errno;

1202

1132

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1204

1133

}

1205

1134

return false;

1206

1135

}

1207

1136

return true;

1208

1137

}

1209

1138

1210

__attribute__((nonnull, warn_unused_result))

1211

1139

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

1212

1140

1213

1141

/* Reject the loopback device */

1255

1183

* corresponds to an acceptable network device.

1256

1184

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

1257

1185

*/

1258

__attribute__((nonnull, warn_unused_result))

1259

1186

int good_interface(const struct dirent *if_entry){

1260

1187

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

1261

1188

return 0;

1277

1204

}

1278

1205

1279

1206

/*

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))

1207

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

1208

* corresponds to an acceptable network device which is up.

1209

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

1210

*/

1211

int up_interface(const struct dirent *if_entry){

1212

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

1213

return 0;

1214

}

1215

1216

struct ifreq ifr;

1217

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

1218

if(debug){

1219

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

1220

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

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject down interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

/* Reject non-running interfaces */

1235

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

1236

if(debug){

1237

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

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

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

1244

return 0;

1245

}

1246

return 1;

1247

}

1248

1314

1249

int notdotentries(const struct dirent *direntry){

1315

1250

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

1316

1251

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

1323

1258

}

1324

1259

1325

1260

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

1326

__attribute__((nonnull, warn_unused_result))

1327

1261

int runnable_hook(const struct dirent *direntry){

1328

1262

int ret;

1329

1263

size_t sret;

1337

1271

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

1338

1272

"abcdefghijklmnopqrstuvwxyz"

1339

1273

"0123456789"

1340

"_.-");

1274

"_-");

1341

1275

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

1342

1276

/* Contains non-allowed characters */

1343

1277

if(debug){

1347

1281

return 0;

1348

1282

}

1349

1283

1350

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

1284

char *fullname = NULL;

1285

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

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1351

1292

if(ret == -1){

1352

1293

if(debug){

1353

1294

perror_plus("Could not stat hook");

1377

1318

return 1;

1378

1319

}

1379

1320

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1383

1322

int ret;

1384

1323

struct timespec now;

1385

1324

struct timespec waited_time;

1386

1325

intmax_t block_time;

1387

1326

1388

1327

while(true){

1389

if(mc->current_server == NULL){

1390

if(debug){

1328

if(mc.current_server == NULL){

1329

if (debug){

1391

1330

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

1392

1331

" No timeout!\n");

1393

1332

}

1394

1333

ret = avahi_simple_poll_iterate(s, -1);

1395

1334

} else {

1396

if(debug){

1335

if (debug){

1397

1336

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

1398

1337

" it, or wait\n");

1399

1338

}

1406

1345

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

1407

1346

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

1408

1347

waited_time.tv_sec = (now.tv_sec

1409

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

1348

- mc.current_server->last_seen.tv_sec);

1410

1349

waited_time.tv_nsec = (now.tv_nsec

1411

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

1350

- mc.current_server->last_seen.tv_nsec);

1412

1351

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

1413

1352

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

1414

1353

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

1416

1355

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

1417

1356

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

1418

1357

1419

if(debug){

1358

if (debug){

1420

1359

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

1421

1360

block_time);

1422

1361

}

1423

1362

1424

1363

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);

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1429

1368

if(ret == 0){

1430

avahi_simple_poll_quit(s);

1369

avahi_simple_poll_quit(mc.simple_poll);

1431

1370

return 0;

1432

1371

}

1433

1372

ret = clock_gettime(CLOCK_MONOTONIC,

1434

&mc->current_server->last_seen);

1373

&mc.current_server->last_seen);

1435

1374

if(ret == -1){

1436

1375

perror_plus("clock_gettime");

1437

1376

return -1;

1438

1377

}

1439

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

1378

mc.current_server = mc.current_server->next;

1440

1379

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

1441

1380

servers, but don't block */

1442

1381

}

1444

1383

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

1445

1384

}

1446

1385

if(ret != 0){

1447

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

1386

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

1448

1387

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

1449

1388

}

1450

1389

}

1451

1390

}

1452

1391

}

1453

1392

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,

1393

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

1531

1394

const float delay){

1532

1395

struct dirent **direntries;

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__ */

1396

struct dirent *direntry;

1397

int ret;

1398

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

1399

alphasort);

1576

1400

if(numhooks == -1){

1577

1401

perror_plus("scandir");

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){

1402

} else {

1403

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

1404

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

1405

direntry = direntries[i];

1406

char *fullname = NULL;

1407

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

1408

if(ret < 0){

1649

1409

perror_plus("asprintf");

1650

_exit(EX_OSERR);

1651

}

1652

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

1653

if(ret == -1){

1410

continue;

1411

}

1412

if(debug){

1413

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

1414

direntry->d_name);

1415

}

1416

pid_t hook_pid = fork();

1417

if(hook_pid == 0){

1418

/* Child */

1419

/* Raise privileges */

1420

errno = 0;

1421

ret = seteuid(0);

1422

if(ret == -1){

1423

perror_plus("seteuid");

1424

}

1425

/* Raise privileges even more */

1426

errno = 0;

1427

ret = setuid(0);

1428

if(ret == -1){

1429

perror_plus("setuid");

1430

}

1431

/* Set group */

1432

errno = 0;

1433

ret = setgid(0);

1434

if(ret == -1){

1435

perror_plus("setgid");

1436

}

1437

/* Reset supplementary groups */

1438

errno = 0;

1439

ret = setgroups(0, NULL);

1440

if(ret == -1){

1441

perror_plus("setgroups");

1442

}

1443

dup2(devnull, STDIN_FILENO);

1444

close(devnull);

1445

dup2(STDERR_FILENO, STDOUT_FILENO);

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

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

1462

if(ret == -1){

1463

perror_plus("setenv");

1464

_exit(EX_OSERR);

1465

}

1466

char *delaystring;

1467

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

1468

if(ret == -1){

1469

perror_plus("asprintf");

1470

_exit(EX_OSERR);

1471

}

1472

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

1473

if(ret == -1){

1474

free(delaystring);

1475

perror_plus("setenv");

1476

_exit(EX_OSERR);

1477

}

1654

1478

free(delaystring);

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;

1479

if(connect_to != NULL){

1480

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

1481

if(ret == -1){

1482

perror_plus("setenv");

1483

_exit(EX_OSERR);

1484

}

1485

}

1486

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

1487

perror_plus("execl");

1488

_exit(EXIT_FAILURE);

1489

}

1490

} else {

1491

int status;

1492

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

1493

perror_plus("waitpid");

1494

free(fullname);

1495

continue;

1496

}

1497

if(WIFEXITED(status)){

1498

if(WEXITSTATUS(status) != 0){

1499

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

1500

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

1501

WEXITSTATUS(status));

1502

free(fullname);

1503

continue;

1504

}

1505

} else if(WIFSIGNALED(status)){

1506

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

1507

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

1508

WTERMSIG(status));

1509

free(fullname);

1510

continue;

1511

} else {

1512

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

1513

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

1514

free(fullname);

1515

continue;

1516

}

1517

}

1518

free(fullname);

1519

if(debug){

1520

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

1521

direntry->d_name);

1522

}

1523

}

1524

close(devnull);

1525

}

1526

return true;

1906

1527

}

1907

1528

1908

1529

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 };

1913

1530

AvahiSServiceBrowser *sb = NULL;

1914

error_t ret_errno;

1531

int error;

1915

1532

int ret;

1916

1533

intmax_t tmpmax;

1917

1534

char *tmp;

1918

1535

int exitcode = EXIT_SUCCESS;

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;

1536

const char *interface = "";

1537

struct ifreq network;

1538

int sd = -1;

1539

bool take_down_interface = false;

1540

uid_t uid;

1541

gid_t gid;

1542

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

1543

bool tempdir_created = false;

1924

1544

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1925

1545

const char *seckey = PATHDIR "/" SECKEY;

1926

1546

const char *pubkey = PATHDIR "/" PUBKEY;

1927

char *interfaces_hooks = NULL;

1928

1547

1929

1548

bool gnutls_initialized = false;

1930

1549

bool gpgme_initialized = false;

2021

1640

connect_to = arg;

2022

1641

break;

2023

1642

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

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

}

1643

interface = arg;

2029

1644

break;

2030

1645

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

2031

1646

seckey = arg;

2108

1723

/* Work around Debian bug #633582:

2109

1724

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

2110

1725

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");

1726

/* Re-raise priviliges */

1727

errno = 0;

1728

ret = seteuid(0);

1729

if(ret == -1){

1730

perror_plus("seteuid");

2116

1731

} else {

2117

1732

struct stat st;

2118

1733

2159

1774

}

2160

1775

2161

1776

/* Lower privileges */

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;

1777

errno = 0;

1778

ret = seteuid(uid);

1779

if(ret == -1){

1780

perror_plus("seteuid");

2183

1781

}

2184

1782

}

2185

1783

}

2186

1784

2187

1785

/* Run network hooks */

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);

1786

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

1787

goto end;

2200

1788

}

2201

1789

2202

1790

if(not debug){

2203

1791

avahi_set_log_function(empty_log);

2204

1792

}

2205

1793

1794

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

1795

struct dirent **direntries;

1796

/* First look for interfaces that are up */

1797

ret = scandir(sys_class_net, &direntries, up_interface,

1798

alphasort);

1799

if(ret == 0){

1800

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

1801

free(direntries);

1802

ret = scandir(sys_class_net, &direntries, good_interface,

1803

alphasort);

1804

}

1805

if(ret >= 1){

1806

/* Pick the first interface returned */

1807

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

1808

if(debug){

1809

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

1810

}

1811

if(interface == NULL){

1812

perror_plus("malloc");

1813

free(direntries);

1814

exitcode = EXIT_FAILURE;

1815

goto end;

1816

}

1817

free(direntries);

1818

} else {

1819

free(direntries);

1820

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

1821

exitcode = EXIT_FAILURE;

1822

goto end;

1823

}

1824

}

1825

2206

1826

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

2207

1827

from the signal handler */

2208

1828

/* Initialize the pseudo-RNG for Avahi */

2209

1829

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

2210

simple_poll = avahi_simple_poll_new();

2211

if(simple_poll == NULL){

1830

mc.simple_poll = avahi_simple_poll_new();

1831

if(mc.simple_poll == NULL){

2212

1832

fprintf_plus(stderr,

2213

1833

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

2214

1834

exitcode = EX_UNAVAILABLE;

2278

1898

}

2279

1899

}

2280

1900

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;

1901

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

1902

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

1903

if_index = (AvahiIfIndex) if_nametoindex(interface);

1904

if(if_index == 0){

1905

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

1906

exitcode = EX_UNAVAILABLE;

1907

goto end;

1908

}

1909

1910

if(quit_now){

1911

goto end;

1912

}

1913

1914

/* Re-raise priviliges */

1915

errno = 0;

1916

ret = seteuid(0);

1917

if(ret == -1){

1918

perror_plus("seteuid");

1919

}

1920

1921

#ifdef __linux__

1922

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1923

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

1924

ret = klogctl(8, NULL, 5);

1925

bool restore_loglevel = true;

1926

if(ret == -1){

1927

restore_loglevel = false;

1928

perror_plus("klogctl");

1929

}

1930

#endif /* __linux__ */

1931

1932

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1933

if(sd < 0){

1934

perror_plus("socket");

1935

exitcode = EX_OSERR;

1936

#ifdef __linux__

1937

if(restore_loglevel){

1938

ret = klogctl(7, NULL, 0);

1939

if(ret == -1){

1940

perror_plus("klogctl");

1941

}

1942

}

1943

#endif /* __linux__ */

1944

/* Lower privileges */

1945

errno = 0;

1946

ret = seteuid(uid);

1947

if(ret == -1){

1948

perror_plus("seteuid");

1949

}

1950

goto end;

1951

}

1952

strcpy(network.ifr_name, interface);

1953

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

1954

if(ret == -1){

1955

perror_plus("ioctl SIOCGIFFLAGS");

1956

#ifdef __linux__

1957

if(restore_loglevel){

1958

ret = klogctl(7, NULL, 0);

1959

if(ret == -1){

1960

perror_plus("klogctl");

1961

}

1962

}

1963

#endif /* __linux__ */

1964

exitcode = EX_OSERR;

1965

/* Lower privileges */

1966

errno = 0;

1967

ret = seteuid(uid);

1968

if(ret == -1){

1969

perror_plus("seteuid");

1970

}

1971

goto end;

1972

}

1973

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

1974

network.ifr_flags |= IFF_UP;

1975

take_down_interface = true;

1976

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

1977

if(ret == -1){

1978

take_down_interface = false;

1979

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1980

exitcode = EX_OSERR;

1981

#ifdef __linux__

1982

if(restore_loglevel){

1983

ret = klogctl(7, NULL, 0);

1984

if(ret == -1){

1985

perror_plus("klogctl");

2328

1986

}

2329

1987

}

1988

#endif /* __linux__ */

1989

/* Lower privileges */

1990

errno = 0;

1991

ret = seteuid(uid);

1992

if(ret == -1){

1993

perror_plus("seteuid");

1994

}

1995

goto end;

1996

}

1997

}

1998

/* Sleep checking until interface is running.

1999

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

2000

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

2001

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

2002

if(ret == -1){

2003

perror_plus("ioctl SIOCGIFFLAGS");

2004

} else if(network.ifr_flags & IFF_RUNNING){

2330

2005

break;

2331

2006

}

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);

2007

struct timespec sleeptime = { .tv_nsec = 250000000 };

2008

ret = nanosleep(&sleeptime, NULL);

2009

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

2010

perror_plus("nanosleep");

2011

}

2012

}

2013

if(not take_down_interface){

2014

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

2015

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

2016

if(ret == -1){

2017

perror_plus("close");

2018

}

2019

}

2020

#ifdef __linux__

2021

if(restore_loglevel){

2022

/* Restores kernel loglevel to default */

2023

ret = klogctl(7, NULL, 0);

2024

if(ret == -1){

2025

perror_plus("klogctl");

2026

}

2027

}

2028

#endif /* __linux__ */

2029

/* Lower privileges */

2030

errno = 0;

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

2035

}

2359

2036

}

2360

2037

2361

2038

if(quit_now){

2362

2039

goto end;

2363

2040

}

2364

2041

2365

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

2042

ret = init_gnutls_global(pubkey, seckey);

2366

2043

if(ret == -1){

2367

2044

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

2368

2045

exitcode = EX_UNAVAILABLE;

2375

2052

goto end;

2376

2053

}

2377

2054

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){

2055

if(mkdtemp(tempdir) == NULL){

2388

2056

perror_plus("mkdtemp");

2389

2057

goto end;

2390

2058

}

2059

tempdir_created = true;

2391

2060

2392

2061

if(quit_now){

2393

2062

goto end;

2394

2063

}

2395

2064

2396

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

2065

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

2397

2066

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

2398

2067

exitcode = EX_UNAVAILABLE;

2399

2068

goto end;

2409

2078

/* Connect directly, do not use Zeroconf */

2410

2079

/* (Mainly meant for debugging) */

2411

2080

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

2412

2413

2081

if(address == NULL){

2414

2082

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

2415

2083

exitcode = EX_USAGE;

2420

2088

goto end;

2421

2089

}

2422

2090

2423

in_port_t port;

2091

uint16_t port;

2424

2092

errno = 0;

2425

2093

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

2426

2094

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

2427

or tmpmax != (in_port_t)tmpmax){

2095

or tmpmax != (uint16_t)tmpmax){

2428

2096

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

2429

2097

exitcode = EX_USAGE;

2430

2098

goto end;

2431

2099

}

2432

2100

2433

2101

if(quit_now){

2434

2102

goto end;

2435

2103

}

2436

2104

2437

port = (in_port_t)tmpmax;

2105

port = (uint16_t)tmpmax;

2438

2106

*address = '\0';

2439

2107

/* Colon in address indicates IPv6 */

2440

2108

int af;

2456

2124

}

2457

2125

2458

2126

while(not quit_now){

2459

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

2460

&mc);

2127

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

2461

2128

if(quit_now or ret == 0){

2462

2129

break;

2463

2130

}

2465

2132

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

2466

2133

(int)retry_interval);

2467

2134

}

2468

sleep((unsigned int)retry_interval);

2135

sleep((int)retry_interval);

2469

2136

}

2470

2137

2471

if(not quit_now){

2138

if (not quit_now){

2472

2139

exitcode = EXIT_SUCCESS;

2473

2140

}

2474

2141

2489

2156

config.publish_domain = 0;

2490

2157

2491

2158

/* Allocate a new server */

2492

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2493

&config, NULL, NULL, &ret_errno);

2159

mc.server = avahi_server_new(avahi_simple_poll_get

2160

(mc.simple_poll), &config, NULL,

2161

NULL, &error);

2494

2162

2495

2163

/* Free the Avahi configuration data */

2496

2164

avahi_server_config_free(&config);

2499

2167

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

2500

2168

if(mc.server == NULL){

2501

2169

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

2502

avahi_strerror(ret_errno));

2170

avahi_strerror(error));

2503

2171

exitcode = EX_UNAVAILABLE;

2504

2172

goto end;

2505

2173

}

2511

2179

/* Create the Avahi service browser */

2512

2180

sb = avahi_s_service_browser_new(mc.server, if_index,

2513

2181

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2514

NULL, 0, browse_callback,

2515

(void *)&mc);

2182

NULL, 0, browse_callback, NULL);

2516

2183

if(sb == NULL){

2517

2184

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

2518

2185

avahi_strerror(avahi_server_errno(mc.server)));

2529

2196

if(debug){

2530

2197

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

2531

2198

}

2532

2533

ret = avahi_loop_with_timeout(simple_poll,

2534

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

2199

2200

ret = avahi_loop_with_timeout(mc.simple_poll,

2201

(int)(retry_interval * 1000));

2535

2202

if(debug){

2536

2203

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

2537

2204

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

2544

2211

}

2545

2212

2546

2213

/* Cleanup things */

2547

free(mc.interfaces);

2548

2549

2214

if(sb != NULL)

2550

2215

avahi_s_service_browser_free(sb);

2551

2216

2552

2217

if(mc.server != NULL)

2553

2218

avahi_server_free(mc.server);

2554

2219

2555

if(simple_poll != NULL)

2556

avahi_simple_poll_free(simple_poll);

2220

if(mc.simple_poll != NULL)

2221

avahi_simple_poll_free(mc.simple_poll);

2557

2222

2558

2223

if(gnutls_initialized){

2559

2224

gnutls_certificate_free_credentials(mc.cred);

2576

2241

}

2577

2242

}

2578

2243

2579

/* Re-raise privileges */

2244

/* Run network hooks */

2245

run_network_hooks("stop", interface, delay);

2246

2247

/* Re-raise priviliges */

2580

2248

{

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

}

2249

errno = 0;

2250

ret = seteuid(0);

2251

if(ret == -1){

2252

perror_plus("seteuid");

2607

2253

}

2608

2254

2609

ret_errno = lower_privileges_permanently();

2610

if(ret_errno != 0){

2611

perror_plus("Failed to lower privileges permanently");

2255

/* Take down the network interface */

2256

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

2257

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

2258

if(ret == -1){

2259

perror_plus("ioctl SIOCGIFFLAGS");

2260

} else if(network.ifr_flags & IFF_UP){

2261

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

2262

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

2263

if(ret == -1){

2264

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2265

}

2266

}

2267

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

2268

if(ret == -1){

2269

perror_plus("close");

2270

}

2612

2271

}

2613

2272

}

2614

2615

free(interfaces_to_take_down);

2616

free(interfaces_hooks);

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

2617

2279

2618

2280

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

2619

if(tempdir != NULL){

2281

if(tempdir_created){

2620

2282

struct dirent **direntries = NULL;

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

}

2283

struct dirent *direntry = NULL;

2284

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

2285

alphasort);

2286

if (numentries > 0){

2287

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

2288

direntry = direntries[i];

2289

char *fullname = NULL;

2290

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

2291

direntry->d_name);

2292

if(ret < 0){

2293

perror_plus("asprintf");

2294

continue;

2295

}

2296

ret = remove(fullname);

2297

if(ret == -1){

2298

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

2299

strerror(errno));

2300

}

2301

free(fullname);

2646

2302

}

2647

TEMP_FAILURE_RETRY(close(tempdir_fd));

2303

}

2304

2305

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

2306

free(direntries);

2307

if (numentries == -1){

2308

perror_plus("scandir");

2309

}

2310

ret = rmdir(tempdir);

2311

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

2312

perror_plus("rmdir");

2648

2313

}

2649

2314

}

2650

2315