/mandos/trunk : revision 601

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() */

58

inet_pton(), connect() */

59

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

61

60

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

62

61

*/

63

62

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

73

72

*/

74

73

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

75

74

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

76

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

77

unlinkat() */

78

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

75

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

76

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

79

77

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

80

78

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

81

79

argp_state, struct argp,

93

91

argz_delete(), argz_append(),

94

92

argz_stringify(), argz_add(),

95

93

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

98

94

99

95

#ifdef __linux__

100

96

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

142

138

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

143

139

char *connect_to = NULL;

144

140

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

141

uid_t uid = 65534;

147

142

gid_t gid = 65534;

148

143

166

161

const char *priority;

167

162

gpgme_ctx_t ctx;

168

163

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

164

} mandos_context;

172

165

173

166

/* global so signal handler can reach it*/

174

167

AvahiSimplePoll *simple_poll;

168

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

169

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

170

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

175

171

176

172

sig_atomic_t quit_now = 0;

177

173

int signal_received = 0;

185

181

perror(print_text);

186

182

}

187

183

188

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

184

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

189

185

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

190

186

va_list ap;

191

187

va_start (ap, format);

192

188

193

189

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

194

190

program_invocation_short_name));

195

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

191

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

196

192

}

197

193

198

194

/*

200

196

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

201

197

* "buffer_length" is how much is already used.

202

198

*/

203

__attribute__((nonnull, warn_unused_result))

204

199

size_t incbuffer(char **buffer, size_t buffer_length,

205

200

size_t buffer_capacity){

206

201

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;

202

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

203

if(buffer == NULL){

213

204

return 0;

214

205

}

215

*buffer = new_buf;

216

206

buffer_capacity += BUFFER_SIZE;

217

207

}

218

208

return buffer_capacity;

219

209

}

220

210

221

211

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

222

__attribute__((nonnull, warn_unused_result))

223

212

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

224

int af, server **current_server){

213

int af){

225

214

int ret;

226

215

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

227

216

if(new_server == NULL){

234

223

.af = af };

235

224

if(new_server->ip == NULL){

236

225

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

free(new_server->ip);

244

free(new_server);

245

226

return false;

246

227

}

247

228

/* Special case of first server */

248

if(*current_server == NULL){

229

if (mc.current_server == NULL){

249

230

new_server->next = new_server;

250

231

new_server->prev = new_server;

251

*current_server = new_server;

232

mc.current_server = new_server;

233

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

252

234

} else {

253

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

254

new_server->next = *current_server;

255

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

235

new_server->next = mc.current_server;

236

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

256

237

new_server->prev->next = new_server;

257

(*current_server)->prev = new_server;

238

mc.current_server->prev = new_server;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

return false;

258

244

}

259

245

return true;

260

246

}

262

248

/*

263

249

* Initialize GPGME.

264

250

*/

265

__attribute__((nonnull, warn_unused_result))

266

static bool init_gpgme(const char * const seckey,

267

const char * const pubkey,

268

const char * const tempdir,

269

mandos_context *mc){

251

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

252

const char *tempdir){

270

253

gpgme_error_t rc;

271

254

gpgme_engine_info_t engine_info;

272

255

273

256

/*

274

257

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

275

258

*/

276

bool import_key(const char * const filename){

259

bool import_key(const char *filename){

277

260

int ret;

278

261

int fd;

279

262

gpgme_data_t pgp_data;

291

274

return false;

292

275

}

293

276

294

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

277

rc = gpgme_op_import(mc.ctx, pgp_data);

295

278

if(rc != GPG_ERR_NO_ERROR){

296

279

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

297

280

gpgme_strsource(rc), gpgme_strerror(rc));

341

324

}

342

325

343

326

/* Create new GPGME "context" */

344

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

327

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

345

328

if(rc != GPG_ERR_NO_ERROR){

346

329

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

347

330

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

360

343

* Decrypt OpenPGP data.

361

344

* Returns -1 on error

362

345

*/

363

__attribute__((nonnull, warn_unused_result))

364

346

static ssize_t pgp_packet_decrypt(const char *cryptotext,

365

347

size_t crypto_size,

366

char **plaintext,

367

mandos_context *mc){

348

char **plaintext){

368

349

gpgme_data_t dh_crypto, dh_plain;

369

350

gpgme_error_t rc;

370

351

ssize_t ret;

396

377

397

378

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

398

379

data buffer */

399

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

380

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

400

381

if(rc != GPG_ERR_NO_ERROR){

401

382

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

402

383

gpgme_strsource(rc), gpgme_strerror(rc));

403

384

plaintext_length = -1;

404

385

if(debug){

405

386

gpgme_decrypt_result_t result;

406

result = gpgme_op_decrypt_result(mc->ctx);

387

result = gpgme_op_decrypt_result(mc.ctx);

407

388

if(result == NULL){

408

389

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

409

390

} else {

486

467

return plaintext_length;

487

468

}

488

469

489

__attribute__((warn_unused_result))

490

static const char *safer_gnutls_strerror(int value){

470

static const char * safer_gnutls_strerror(int value){

491

471

const char *ret = gnutls_strerror(value);

492

472

if(ret == NULL)

493

473

ret = "(unknown)";

495

475

}

496

476

497

477

/* GnuTLS log function callback */

498

__attribute__((nonnull))

499

478

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

500

479

const char* string){

501

480

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

502

481

}

503

482

504

__attribute__((nonnull, warn_unused_result))

505

483

static int init_gnutls_global(const char *pubkeyfilename,

506

const char *seckeyfilename,

507

mandos_context *mc){

484

const char *seckeyfilename){

508

485

int ret;

509

486

510

487

if(debug){

527

504

}

528

505

529

506

/* OpenPGP credentials */

530

ret = gnutls_certificate_allocate_credentials(&mc->cred);

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

531

508

if(ret != GNUTLS_E_SUCCESS){

532

509

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

533

510

safer_gnutls_strerror(ret));

543

520

}

544

521

545

522

ret = gnutls_certificate_set_openpgp_key_file

546

(mc->cred, pubkeyfilename, seckeyfilename,

523

(mc.cred, pubkeyfilename, seckeyfilename,

547

524

GNUTLS_OPENPGP_FMT_BASE64);

548

525

if(ret != GNUTLS_E_SUCCESS){

549

526

fprintf_plus(stderr,

555

532

}

556

533

557

534

/* GnuTLS server initialization */

558

ret = gnutls_dh_params_init(&mc->dh_params);

535

ret = gnutls_dh_params_init(&mc.dh_params);

559

536

if(ret != GNUTLS_E_SUCCESS){

560

537

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

561

538

" initialization: %s\n",

562

539

safer_gnutls_strerror(ret));

563

540

goto globalfail;

564

541

}

565

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

542

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

566

543

if(ret != GNUTLS_E_SUCCESS){

567

544

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

568

545

safer_gnutls_strerror(ret));

569

546

goto globalfail;

570

547

}

571

548

572

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

549

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

573

550

574

551

return 0;

575

552

576

553

globalfail:

577

554

578

gnutls_certificate_free_credentials(mc->cred);

555

gnutls_certificate_free_credentials(mc.cred);

579

556

gnutls_global_deinit();

580

gnutls_dh_params_deinit(mc->dh_params);

557

gnutls_dh_params_deinit(mc.dh_params);

581

558

return -1;

582

559

}

583

560

584

__attribute__((nonnull, warn_unused_result))

585

static int init_gnutls_session(gnutls_session_t *session,

586

mandos_context *mc){

561

static int init_gnutls_session(gnutls_session_t *session){

587

562

int ret;

588

563

/* GnuTLS session creation */

589

564

do {

601

576

{

602

577

const char *err;

603

578

do {

604

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

579

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

605

580

if(quit_now){

606

581

gnutls_deinit(*session);

607

582

return -1;

618

593

619

594

do {

620

595

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

621

mc->cred);

596

mc.cred);

622

597

if(quit_now){

623

598

gnutls_deinit(*session);

624

599

return -1;

634

609

/* ignore client certificate if any. */

635

610

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

636

611

637

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

638

613

639

614

return 0;

640

615

}

644

619

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

645

620

646

621

/* Called when a Mandos server is found */

647

__attribute__((nonnull, warn_unused_result))

648

622

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

649

623

AvahiIfIndex if_index,

650

int af, mandos_context *mc){

624

int af){

651

625

int ret, tcp_sd = -1;

652

626

ssize_t sret;

653

struct sockaddr_storage to;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

654

631

char *buffer = NULL;

655

632

char *decrypted_buffer = NULL;

656

633

size_t buffer_length = 0;

680

657

return -1;

681

658

}

682

659

683

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

684

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

685

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

686

bool match = false;

687

{

688

char *interface = NULL;

689

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

690

interface))){

691

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

692

match = true;

693

break;

694

}

695

}

696

}

697

if(not match){

698

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

699

connect to the server */

700

if(debug){

701

char interface[IF_NAMESIZE];

702

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

703

perror_plus("if_indextoname");

704

} else {

705

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

706

" \"%s\"\n",

707

if_indextoname((unsigned int)if_index,

708

interface));

709

}

710

}

711

return -1;

712

}

713

}

714

715

ret = init_gnutls_session(&session, mc);

660

ret = init_gnutls_session(&session);

716

661

if(ret != 0){

717

662

return -1;

718

663

}

737

682

738

683

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

739

684

if(af == AF_INET6){

740

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

741

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

685

to.in6.sin6_family = (sa_family_t)af;

686

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

742

687

} else { /* IPv4 */

743

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

744

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

688

to.in.sin_family = (sa_family_t)af;

689

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

745

690

}

746

691

if(ret < 0 ){

747

692

int e = errno;

756

701

goto mandos_end;

757

702

}

758

703

if(af == AF_INET6){

759

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

760

if(IN6_IS_ADDR_LINKLOCAL

761

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

704

to.in6.sin6_port = htons(port);

705

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

706

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

707

-Wunreachable-code*/

762

708

if(if_index == AVAHI_IF_UNSPEC){

763

709

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

764

710

" incomplete without a network interface\n");

766

712

goto mandos_end;

767

713

}

768

714

/* Set the network interface number as scope */

769

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

715

to.in6.sin6_scope_id = (uint32_t)if_index;

770

716

}

771

717

} else {

772

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

718

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

719

-Wconversion and

720

-Wunreachable-code */

773

721

}

774

722

775

723

if(quit_now){

792

740

}

793

741

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

794

742

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

743

const char *pcret;

795

744

if(af == AF_INET6){

796

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

797

sizeof(struct sockaddr_in6),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

745

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

746

sizeof(addrstr));

800

747

} else {

801

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

802

sizeof(struct sockaddr_in),

803

addrstr, sizeof(addrstr), NULL, 0,

804

NI_NUMERICHOST);

748

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

749

sizeof(addrstr));

805

750

}

806

if(ret == EAI_SYSTEM){

807

perror_plus("getnameinfo");

808

} else if(ret != 0) {

809

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

810

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

811

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

751

if(pcret == NULL){

752

perror_plus("inet_ntop");

753

} else {

754

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

755

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

756

}

812

757

}

813

758

}

814

759

818

763

}

819

764

820

765

if(af == AF_INET6){

821

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

822

sizeof(struct sockaddr_in6));

766

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

823

767

} else {

824

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

825

sizeof(struct sockaddr_in));

768

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

826

769

}

827

770

if(ret < 0){

828

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

771

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

829

772

int e = errno;

830

773

perror_plus("connect");

831

774

errno = e;

992

935

if(buffer_length > 0){

993

936

ssize_t decrypted_buffer_size;

994

937

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

995

&decrypted_buffer, mc);

938

&decrypted_buffer);

996

939

if(decrypted_buffer_size >= 0){

997

940

998

941

written = 0;

1046

989

return retval;

1047

990

}

1048

991

1049

__attribute__((nonnull))

1050

992

static void resolve_callback(AvahiSServiceResolver *r,

1051

993

AvahiIfIndex interface,

1052

994

AvahiProtocol proto,

1060

1002

AVAHI_GCC_UNUSED AvahiStringList *txt,

1061

1003

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

1004

flags,

1063

void *mc){

1005

AVAHI_GCC_UNUSED void* userdata){

1064

1006

if(r == NULL){

1065

1007

return;

1066

1008

}

1078

1020

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

1079

1021

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

1080

1022

domain,

1081

avahi_strerror(avahi_server_errno

1082

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

1023

avahi_strerror(avahi_server_errno(mc.server)));

1083

1024

break;

1084

1025

1085

1026

case AVAHI_RESOLVER_FOUND:

1093

1034

}

1094

1035

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

1095

1036

interface,

1096

avahi_proto_to_af(proto),

1097

mc);

1037

avahi_proto_to_af(proto));

1098

1038

if(ret == 0){

1099

1039

avahi_simple_poll_quit(simple_poll);

1100

1040

} else {

1101

1041

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

1102

avahi_proto_to_af(proto),

1103

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

1042

avahi_proto_to_af(proto))){

1104

1043

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

1105

1044

" list\n", name);

1106

1045

}

1119

1058

const char *domain,

1120

1059

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1121

1060

flags,

1122

void *mc){

1061

AVAHI_GCC_UNUSED void* userdata){

1123

1062

if(b == NULL){

1124

1063

return;

1125

1064

}

1136

1075

case AVAHI_BROWSER_FAILURE:

1137

1076

1138

1077

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

1139

avahi_strerror(avahi_server_errno

1140

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

1078

avahi_strerror(avahi_server_errno(mc.server)));

1141

1079

avahi_simple_poll_quit(simple_poll);

1142

1080

return;

1143

1081

1147

1085

the callback function is called the Avahi server will free the

1148

1086

resolver for us. */

1149

1087

1150

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

1151

interface, protocol, name, type,

1152

domain, protocol, 0,

1153

resolve_callback, mc) == NULL)

1088

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

1089

name, type, domain, protocol, 0,

1090

resolve_callback, NULL) == NULL)

1154

1091

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

1155

1092

" %s\n", name,

1156

avahi_strerror(avahi_server_errno

1157

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

1093

avahi_strerror(avahi_server_errno(mc.server)));

1158

1094

break;

1159

1095

1160

1096

case AVAHI_BROWSER_REMOVE:

1185

1121

errno = old_errno;

1186

1122

}

1187

1123

1188

__attribute__((nonnull, warn_unused_result))

1189

1124

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

1190

1125

int ret;

1191

1126

error_t ret_errno;

1210

1145

return true;

1211

1146

}

1212

1147

1213

__attribute__((nonnull, warn_unused_result))

1214

1148

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

1215

1149

1216

1150

/* Reject the loopback device */

1258

1192

* corresponds to an acceptable network device.

1259

1193

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

1260

1194

*/

1261

__attribute__((nonnull, warn_unused_result))

1262

1195

int good_interface(const struct dirent *if_entry){

1263

1196

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

1264

1197

return 0;

1282

1215

/*

1283

1216

* This function determines if a network interface is up.

1284

1217

*/

1285

__attribute__((nonnull, warn_unused_result))

1286

1218

bool interface_is_up(const char *interface){

1287

1219

struct ifreq ifr;

1288

1220

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

1299

1231

/*

1300

1232

* This function determines if a network interface is running

1301

1233

*/

1302

__attribute__((nonnull, warn_unused_result))

1303

1234

bool interface_is_running(const char *interface){

1304

1235

struct ifreq ifr;

1305

1236

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

1313

1244

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

1314

1245

}

1315

1246

1316

__attribute__((nonnull, pure, warn_unused_result))

1317

1247

int notdotentries(const struct dirent *direntry){

1318

1248

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

1319

1249

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

1326

1256

}

1327

1257

1328

1258

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

1329

__attribute__((nonnull, warn_unused_result))

1330

1259

int runnable_hook(const struct dirent *direntry){

1331

1260

int ret;

1332

1261

size_t sret;

1340

1269

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

1341

1270

"abcdefghijklmnopqrstuvwxyz"

1342

1271

"0123456789"

1343

"_.-");

1272

"_-");

1344

1273

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

1345

1274

/* Contains non-allowed characters */

1346

1275

if(debug){

1350

1279

return 0;

1351

1280

}

1352

1281

1353

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

1282

char *fullname = NULL;

1283

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

1284

if(ret < 0){

1285

perror_plus("asprintf");

1286

return 0;

1287

}

1288

1289

ret = stat(fullname, &st);

1354

1290

if(ret == -1){

1355

1291

if(debug){

1356

1292

perror_plus("Could not stat hook");

1380

1316

return 1;

1381

1317

}

1382

1318

1383

__attribute__((nonnull, warn_unused_result))

1384

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1385

mandos_context *mc){

1319

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1386

1320

int ret;

1387

1321

struct timespec now;

1388

1322

struct timespec waited_time;

1389

1323

intmax_t block_time;

1390

1324

1391

1325

while(true){

1392

if(mc->current_server == NULL){

1393

if(debug){

1326

if(mc.current_server == NULL){

1327

if (debug){

1394

1328

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

1395

1329

" No timeout!\n");

1396

1330

}

1397

1331

ret = avahi_simple_poll_iterate(s, -1);

1398

1332

} else {

1399

if(debug){

1333

if (debug){

1400

1334

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

1401

1335

" it, or wait\n");

1402

1336

}

1409

1343

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

1410

1344

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

1411

1345

waited_time.tv_sec = (now.tv_sec

1412

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

1346

- mc.current_server->last_seen.tv_sec);

1413

1347

waited_time.tv_nsec = (now.tv_nsec

1414

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

1348

- mc.current_server->last_seen.tv_nsec);

1415

1349

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

1416

1350

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

1417

1351

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

1419

1353

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

1420

1354

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

1421

1355

1422

if(debug){

1356

if (debug){

1423

1357

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

1424

1358

block_time);

1425

1359

}

1426

1360

1427

1361

if(block_time <= 0){

1428

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

1429

mc->current_server->port,

1430

mc->current_server->if_index,

1431

mc->current_server->af, mc);

1362

ret = start_mandos_communication(mc.current_server->ip,

1363

mc.current_server->port,

1364

mc.current_server->if_index,

1365

mc.current_server->af);

1432

1366

if(ret == 0){

1433

avahi_simple_poll_quit(s);

1367

avahi_simple_poll_quit(simple_poll);

1434

1368

return 0;

1435

1369

}

1436

1370

ret = clock_gettime(CLOCK_MONOTONIC,

1437

&mc->current_server->last_seen);

1371

&mc.current_server->last_seen);

1438

1372

if(ret == -1){

1439

1373

perror_plus("clock_gettime");

1440

1374

return -1;

1441

1375

}

1442

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

1376

mc.current_server = mc.current_server->next;

1443

1377

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

1444

1378

servers, but don't block */

1445

1379

}

1447

1381

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

1448

1382

}

1449

1383

if(ret != 0){

1450

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

1384

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

1451

1385

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

1452

1386

}

1453

1387

}

1455

1389

}

1456

1390

1457

1391

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

1458

__attribute__((warn_unused_result))

1459

1392

error_t raise_privileges(void){

1460

1393

error_t old_errno = errno;

1461

1394

error_t ret_errno = 0;

1462

1395

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

1463

1396

ret_errno = errno;

1397

perror_plus("seteuid");

1464

1398

}

1465

1399

errno = old_errno;

1466

1400

return ret_errno;

1467

1401

}

1468

1402

1469

1403

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

1470

__attribute__((warn_unused_result))

1471

1404

error_t raise_privileges_permanently(void){

1472

1405

error_t old_errno = errno;

1473

1406

error_t ret_errno = raise_privileges();

1477

1410

}

1478

1411

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

1479

1412

ret_errno = errno;

1413

perror_plus("seteuid");

1480

1414

}

1481

1415

errno = old_errno;

1482

1416

return ret_errno;

1483

1417

}

1484

1418

1485

1419

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

1486

__attribute__((warn_unused_result))

1487

1420

error_t lower_privileges(void){

1488

1421

error_t old_errno = errno;

1489

1422

error_t ret_errno = 0;

1490

1423

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

1491

1424

ret_errno = errno;

1425

perror_plus("seteuid");

1492

1426

}

1493

1427

errno = old_errno;

1494

1428

return ret_errno;

1495

1429

}

1496

1430

1497

1431

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

1432

error_t lower_privileges_permanently(void){

1500

1433

error_t old_errno = errno;

1501

1434

error_t ret_errno = 0;

1502

1435

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

1503

1436

ret_errno = errno;

1437

perror_plus("setuid");

1504

1438

}

1505

1439

errno = old_errno;

1506

1440

return ret_errno;

1507

1441

}

1508

1442

1509

__attribute__((nonnull))

1510

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

1443

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

1511

1444

const float delay){

1512

struct dirent **direntries = NULL;

1513

if(hookdir_fd == -1){

1514

hookdir_fd = open(hookdir, O_RDONLY);

1515

if(hookdir_fd == -1){

1516

if(errno == ENOENT){

1517

if(debug){

1518

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

1519

" found\n", hookdir);

1520

}

1521

} else {

1522

perror_plus("open");

1523

}

1524

return;

1525

}

1526

}

1527

#ifdef __GLIBC__

1528

#if __GLIBC_PREREQ(2, 15)

1529

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

1530

runnable_hook, alphasort);

1531

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

1532

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

1533

alphasort);

1534

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

1535

#else /* not __GLIBC__ */

1536

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

1537

alphasort);

1538

#endif /* not __GLIBC__ */

1445

struct dirent **direntries;

1446

struct dirent *direntry;

1447

int ret;

1448

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

1449

alphasort);

1539

1450

if(numhooks == -1){

1540

perror_plus("scandir");

1541

return;

1542

}

1543

struct dirent *direntry;

1544

int ret;

1545

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

1546

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

1547

direntry = direntries[i];

1548

if(debug){

1549

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

1550

direntry->d_name);

1451

if(errno == ENOENT){

1452

if(debug){

1453

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

1454

" found\n", hookdir);

1455

}

1456

} else {

1457

perror_plus("scandir");

1551

1458

}

1552

pid_t hook_pid = fork();

1553

if(hook_pid == 0){

1554

/* Child */

1555

/* Raise privileges */

1556

errno = raise_privileges_permanently();

1557

if(errno != 0){

1558

perror_plus("Failed to raise privileges");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Set group */

1562

errno = 0;

1563

ret = setgid(0);

1564

if(ret == -1){

1565

perror_plus("setgid");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Reset supplementary groups */

1569

errno = 0;

1570

ret = setgroups(0, NULL);

1571

if(ret == -1){

1572

perror_plus("setgroups");

1573

_exit(EX_NOPERM);

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

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

1591

if(ret == -1){

1592

perror_plus("setenv");

1593

_exit(EX_OSERR);

1594

}

1595

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

1596

if(ret == -1){

1597

perror_plus("setenv");

1598

_exit(EX_OSERR);

1599

}

1600

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

1601

if(ret == -1){

1602

perror_plus("setenv");

1603

_exit(EX_OSERR);

1604

}

1605

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

1606

if(ret == -1){

1607

perror_plus("setenv");

1608

_exit(EX_OSERR);

1609

}

1610

char *delaystring;

1611

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

1612

if(ret == -1){

1459

} else {

1460

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

1461

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

1462

direntry = direntries[i];

1463

char *fullname = NULL;

1464

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

1465

if(ret < 0){

1613

1466

perror_plus("asprintf");

1614

_exit(EX_OSERR);

1615

}

1616

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

1617

if(ret == -1){

1467

continue;

1468

}

1469

if(debug){

1470

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

1471

direntry->d_name);

1472

}

1473

pid_t hook_pid = fork();

1474

if(hook_pid == 0){

1475

/* Child */

1476

/* Raise privileges */

1477

raise_privileges_permanently();

1478

/* Set group */

1479

errno = 0;

1480

ret = setgid(0);

1481

if(ret == -1){

1482

perror_plus("setgid");

1483

}

1484

/* Reset supplementary groups */

1485

errno = 0;

1486

ret = setgroups(0, NULL);

1487

if(ret == -1){

1488

perror_plus("setgroups");

1489

}

1490

dup2(devnull, STDIN_FILENO);

1491

close(devnull);

1492

dup2(STDERR_FILENO, STDOUT_FILENO);

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

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

1499

if(ret == -1){

1500

perror_plus("setenv");

1501

_exit(EX_OSERR);

1502

}

1503

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

1504

if(ret == -1){

1505

perror_plus("setenv");

1506

_exit(EX_OSERR);

1507

}

1508

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

1509

if(ret == -1){

1510

perror_plus("setenv");

1511

_exit(EX_OSERR);

1512

}

1513

char *delaystring;

1514

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

1515

if(ret == -1){

1516

perror_plus("asprintf");

1517

_exit(EX_OSERR);

1518

}

1519

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

1520

if(ret == -1){

1521

free(delaystring);

1522

perror_plus("setenv");

1523

_exit(EX_OSERR);

1524

}

1618

1525

free(delaystring);

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

free(delaystring);

1623

if(connect_to != NULL){

1624

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

1625

if(ret == -1){

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

}

1630

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

1631

if(hook_fd == -1){

1632

perror_plus("openat");

1633

_exit(EXIT_FAILURE);

1634

}

1635

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

1636

perror_plus("close");

1637

_exit(EXIT_FAILURE);

1638

}

1639

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

1640

environ) == -1){

1641

perror_plus("fexecve");

1642

_exit(EXIT_FAILURE);

1643

}

1644

} else {

1645

int status;

1646

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

1647

perror_plus("waitpid");

1648

continue;

1649

}

1650

if(WIFEXITED(status)){

1651

if(WEXITSTATUS(status) != 0){

1652

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

1653

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

1654

WEXITSTATUS(status));

1655

continue;

1656

}

1657

} else if(WIFSIGNALED(status)){

1658

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

1659

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

1660

WTERMSIG(status));

1661

continue;

1526

if(connect_to != NULL){

1527

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

1528

if(ret == -1){

1529

perror_plus("setenv");

1530

_exit(EX_OSERR);

1531

}

1532

}

1533

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

1534

perror_plus("execl");

1535

_exit(EXIT_FAILURE);

1536

}

1662

1537

} else {

1663

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

1664

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

1665

continue;

1666

}

1667

}

1668

if(debug){

1669

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

1670

direntry->d_name);

1671

}

1672

}

1673

free(direntries);

1674

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

1675

perror_plus("close");

1676

} else {

1677

hookdir_fd = -1;

1678

}

1679

close(devnull);

1538

int status;

1539

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

1540

perror_plus("waitpid");

1541

free(fullname);

1542

continue;

1543

}

1544

if(WIFEXITED(status)){

1545

if(WEXITSTATUS(status) != 0){

1546

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

1547

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

1548

WEXITSTATUS(status));

1549

free(fullname);

1550

continue;

1551

}

1552

} else if(WIFSIGNALED(status)){

1553

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

1554

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

1555

WTERMSIG(status));

1556

free(fullname);

1557

continue;

1558

} else {

1559

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

1560

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

1561

free(fullname);

1562

continue;

1563

}

1564

}

1565

free(fullname);

1566

if(debug){

1567

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

1568

direntry->d_name);

1569

}

1570

}

1571

close(devnull);

1572

}

1573

return true;

1680

1574

}

1681

1575

1682

__attribute__((nonnull, warn_unused_result))

1683

1576

error_t bring_up_interface(const char *const interface,

1684

1577

const float delay){

1578

int sd = -1;

1685

1579

error_t old_errno = errno;

1686

int ret;

1580

error_t ret_errno = 0;

1581

int ret, ret_setflags;

1687

1582

struct ifreq network;

1688

1583

unsigned int if_index = if_nametoindex(interface);

1689

1584

if(if_index == 0){

1698

1593

}

1699

1594

1700

1595

if(not interface_is_up(interface)){

1701

error_t ret_errno = 0, ioctl_errno = 0;

1702

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

1596

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

1703

1597

ret_errno = errno;

1704

1598

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

1705

1599

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

1706

errno = old_errno;

1707

1600

return ret_errno;

1708

1601

}

1709

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

1602

network.ifr_flags |= IFF_UP;

1710

1603

1711

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

1712

if(sd == -1){

1604

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1605

if(sd < 0){

1713

1606

ret_errno = errno;

1714

1607

perror_plus("socket");

1715

1608

errno = old_errno;

1716

1609

return ret_errno;

1717

1610

}

1718

1611

1719

1612

if(quit_now){

1720

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

1721

if(ret == -1){

1722

perror_plus("close");

1723

}

1613

close(sd);

1724

1614

errno = old_errno;

1725

1615

return EINTR;

1726

1616

}

1730

1620

interface);

1731

1621

}

1732

1622

1733

/* Raise privileges */

1734

ret_errno = raise_privileges();

1735

if(ret_errno != 0){

1736

errno = ret_errno;

1737

perror_plus("Failed to raise privileges");

1738

}

1623

/* Raise priviliges */

1624

raise_privileges();

1739

1625

1740

1626

#ifdef __linux__

1741

int ret_linux;

1742

bool restore_loglevel = false;

1743

if(ret_errno == 0){

1744

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1745

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

1746

ret_linux = klogctl(8, NULL, 5);

1747

if(ret_linux == -1){

1748

perror_plus("klogctl");

1749

} else {

1750

restore_loglevel = true;

1751

}

1627

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1628

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

1629

int ret_linux = klogctl(8, NULL, 5);

1630

bool restore_loglevel = true;

1631

if(ret_linux == -1){

1632

restore_loglevel = false;

1633

perror_plus("klogctl");

1752

1634

}

1753

1635

#endif /* __linux__ */

1754

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

1755

ioctl_errno = errno;

1636

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

1637

ret_errno = errno;

1756

1638

#ifdef __linux__

1757

1639

if(restore_loglevel){

1758

1640

ret_linux = klogctl(7, NULL, 0);

1762

1644

}

1763

1645

#endif /* __linux__ */

1764

1646

1765

/* If raise_privileges() succeeded above */

1766

if(ret_errno == 0){

1767

/* Lower privileges */

1768

ret_errno = lower_privileges();

1769

if(ret_errno != 0){

1770

errno = ret_errno;

1771

perror_plus("Failed to lower privileges");

1772

}

1773

}

1647

/* Lower privileges */

1648

lower_privileges();

1774

1649

1775

1650

/* Close the socket */

1776

1651

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

1779

1654

}

1780

1655

1781

1656

if(ret_setflags == -1){

1782

errno = ioctl_errno;

1657

errno = ret_errno;

1783

1658

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1784

1659

errno = old_errno;

1785

return ioctl_errno;

1660

return ret_errno;

1786

1661

}

1787

1662

} else if(debug){

1788

1663

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

1806

1681

return 0;

1807

1682

}

1808

1683

1809

__attribute__((nonnull, warn_unused_result))

1810

1684

error_t take_down_interface(const char *const interface){

1685

int sd = -1;

1811

1686

error_t old_errno = errno;

1687

error_t ret_errno = 0;

1688

int ret, ret_setflags;

1812

1689

struct ifreq network;

1813

1690

unsigned int if_index = if_nametoindex(interface);

1814

1691

if(if_index == 0){

1817

1694

return ENXIO;

1818

1695

}

1819

1696

if(interface_is_up(interface)){

1820

error_t ret_errno = 0, ioctl_errno = 0;

1821

1697

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

1822

1698

ret_errno = errno;

1823

1699

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

1824

1700

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

1825

errno = old_errno;

1826

1701

return ret_errno;

1827

1702

}

1828

1703

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

1829

1704

1830

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

1831

if(sd == -1){

1705

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1706

if(sd < 0){

1832

1707

ret_errno = errno;

1833

1708

perror_plus("socket");

1834

1709

errno = old_errno;

1840

1715

interface);

1841

1716

}

1842

1717

1843

/* Raise privileges */

1844

ret_errno = raise_privileges();

1845

if(ret_errno != 0){

1846

errno = ret_errno;

1847

perror_plus("Failed to raise privileges");

1848

}

1849

1850

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

1851

ioctl_errno = errno;

1852

1853

/* If raise_privileges() succeeded above */

1854

if(ret_errno == 0){

1855

/* Lower privileges */

1856

ret_errno = lower_privileges();

1857

if(ret_errno != 0){

1858

errno = ret_errno;

1859

perror_plus("Failed to lower privileges");

1860

}

1861

}

1718

/* Raise priviliges */

1719

raise_privileges();

1720

1721

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

1722

ret_errno = errno;

1723

1724

/* Lower privileges */

1725

lower_privileges();

1862

1726

1863

1727

/* Close the socket */

1864

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

1728

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

1865

1729

if(ret == -1){

1866

1730

perror_plus("close");

1867

1731

}

1868

1732

1869

1733

if(ret_setflags == -1){

1870

errno = ioctl_errno;

1734

errno = ret_errno;

1871

1735

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1872

1736

errno = old_errno;

1873

return ioctl_errno;

1737

return ret_errno;

1874

1738

}

1875

1739

} else if(debug){

1876

1740

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

1882

1746

}

1883

1747

1884

1748

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

1885

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

1886

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

1887

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

1888

.interfaces = NULL, .interfaces_size = 0 };

1889

1749

AvahiSServiceBrowser *sb = NULL;

1890

1750

error_t ret_errno;

1891

1751

int ret;

1892

1752

intmax_t tmpmax;

1893

1753

char *tmp;

1894

1754

int exitcode = EXIT_SUCCESS;

1755

char *interfaces = NULL;

1756

size_t interfaces_size = 0;

1895

1757

char *interfaces_to_take_down = NULL;

1896

1758

size_t interfaces_to_take_down_size = 0;

1897

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

1898

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

1899

char *tempdir = NULL;

1759

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

1760

bool tempdir_created = false;

1900

1761

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1901

1762

const char *seckey = PATHDIR "/" SECKEY;

1902

1763

const char *pubkey = PATHDIR "/" PUBKEY;

1903

1764

char *interfaces_hooks = NULL;

1765

size_t interfaces_hooks_size = 0;

1904

1766

1905

1767

bool gnutls_initialized = false;

1906

1768

bool gpgme_initialized = false;

1997

1859

connect_to = arg;

1998

1860

break;

1999

1861

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

2000

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

2001

arg, (int)',');

1862

ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,

1863

(int)',');

2002

1864

if(ret_errno != 0){

2003

1865

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

2004

1866

}

2084

1946

/* Work around Debian bug #633582:

2085

1947

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

2086

1948

2087

/* Re-raise privileges */

2088

ret_errno = raise_privileges();

2089

if(ret_errno != 0){

2090

errno = ret_errno;

2091

perror_plus("Failed to raise privileges");

2092

} else {

1949

/* Re-raise priviliges */

1950

if(raise_privileges() == 0){

2093

1951

struct stat st;

2094

1952

2095

1953

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

2135

1993

}

2136

1994

2137

1995

/* Lower privileges */

2138

ret_errno = lower_privileges();

2139

if(ret_errno != 0){

2140

errno = ret_errno;

2141

perror_plus("Failed to lower privileges");

1996

errno = 0;

1997

ret = seteuid(uid);

1998

if(ret == -1){

1999

perror_plus("seteuid");

2142

2000

}

2143

2001

}

2144

2002

}

2145

2003

2146

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

2004

/* Remove empty interface names */

2147

2005

{

2148

2006

char *interface = NULL;

2149

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

2007

while((interface = argz_next(interfaces, interfaces_size,

2150

2008

interface))){

2151

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

2152

and if_nametoindex(interface) == 0){

2153

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

2009

if(if_nametoindex(interface) == 0){

2010

if(interface[0] != '\0' and strcmp(interface, "none") != 0){

2154

2011

fprintf_plus(stderr, "Not using nonexisting interface"

2155

2012

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

2156

2013

}

2157

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

2014

argz_delete(&interfaces, &interfaces_size, interface);

2158

2015

interface = NULL;

2159

2016

}

2160

2017

}

2162

2019

2163

2020

/* Run network hooks */

2164

2021

{

2165

if(mc.interfaces != NULL){

2166

interfaces_hooks = malloc(mc.interfaces_size);

2022

2023

if(interfaces != NULL){

2024

interfaces_hooks = malloc(interfaces_size);

2167

2025

if(interfaces_hooks == NULL){

2168

2026

perror_plus("malloc");

2169

2027

goto end;

2170

2028

}

2171

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

2172

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

2173

}

2174

run_network_hooks("start", interfaces_hooks != NULL ?

2175

interfaces_hooks : "", delay);

2029

memcpy(interfaces_hooks, interfaces, interfaces_size);

2030

interfaces_hooks_size = interfaces_size;

2031

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2032

(int)',');

2033

}

2034

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2035

interfaces_hooks : "", delay)){

2036

goto end;

2037

}

2176

2038

}

2177

2039

2178

2040

if(not debug){

2255

2117

}

2256

2118

2257

2119

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

2258

if(mc.interfaces == NULL){

2259

struct dirent **direntries = NULL;

2120

if(interfaces == NULL){

2121

struct dirent **direntries;

2260

2122

/* Look for any good interfaces */

2261

2123

ret = scandir(sys_class_net, &direntries, good_interface,

2262

2124

alphasort);

2263

2125

if(ret >= 1){

2264

2126

/* Add all found interfaces to interfaces list */

2265

2127

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

2266

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

2128

ret_errno = argz_add(&interfaces, &interfaces_size,

2267

2129

direntries[i]->d_name);

2268

2130

if(ret_errno != 0){

2269

errno = ret_errno;

2270

2131

perror_plus("argz_add");

2271

2132

continue;

2272

2133

}

2277

2138

}

2278

2139

free(direntries);

2279

2140

} else {

2280

if(ret == 0){

2281

free(direntries);

2282

}

2141

free(direntries);

2283

2142

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

2284

2143

exitcode = EXIT_FAILURE;

2285

2144

goto end;

2286

2145

}

2287

2146

}

2288

2147

2289

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

2290

{

2148

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

2149

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

2150

if(debug){

2151

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

2152

interfaces);

2153

}

2154

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2155

}

2156

2157

/* Bring up interfaces which are down */

2158

if(not (argz_count(interfaces, interfaces_size) == 1

2159

and strcmp(interfaces, "none") == 0)){

2291

2160

char *interface = NULL;

2292

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

2161

while((interface = argz_next(interfaces, interfaces_size,

2293

2162

interface))){

2294

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

2295

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

2296

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

2297

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

2298

interface);

2299

interface = NULL;

2300

while((interface = argz_next(mc.interfaces,

2301

mc.interfaces_size, interface))){

2302

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

2303

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

2304

interface);

2305

interface = NULL;

2306

}

2307

}

2308

break;

2309

}

2310

2163

bool interface_was_up = interface_is_up(interface);

2311

errno = bring_up_interface(interface, delay);

2164

ret = bring_up_interface(interface, delay);

2312

2165

if(not interface_was_up){

2313

if(errno != 0){

2166

if(ret != 0){

2167

errno = ret;

2314

2168

perror_plus("Failed to bring up interface");

2315

2169

} else {

2316

errno = argz_add(&interfaces_to_take_down,

2317

&interfaces_to_take_down_size,

2318

interface);

2319

if(errno != 0){

2320

perror_plus("argz_add");

2321

}

2170

ret_errno = argz_add(&interfaces_to_take_down,

2171

&interfaces_to_take_down_size,

2172

interface);

2322

2173

}

2323

2174

}

2324

2175

}

2176

free(interfaces);

2177

interfaces = NULL;

2178

interfaces_size = 0;

2325

2179

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

2326

2180

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

2327

2181

}

2328

2182

}

2329

2183

2330

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

2331

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

2332

if(debug){

2333

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

2334

mc.interfaces);

2335

}

2336

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

2337

}

2338

2339

2184

if(quit_now){

2340

2185

goto end;

2341

2186

}

2342

2187

2343

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

2188

ret = init_gnutls_global(pubkey, seckey);

2344

2189

if(ret == -1){

2345

2190

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

2346

2191

exitcode = EX_UNAVAILABLE;

2353

2198

goto end;

2354

2199

}

2355

2200

2356

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

2357

tempdir = mkdtemp(run_tempdir);

2358

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

2359

if(debug){

2360

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

2361

run_tempdir, old_tempdir);

2362

}

2363

tempdir = mkdtemp(old_tempdir);

2364

}

2365

if(tempdir == NULL){

2201

if(mkdtemp(tempdir) == NULL){

2366

2202

perror_plus("mkdtemp");

2367

2203

goto end;

2368

2204

}

2205

tempdir_created = true;

2369

2206

2370

2207

if(quit_now){

2371

2208

goto end;

2372

2209

}

2373

2210

2374

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

2211

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

2375

2212

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

2376

2213

exitcode = EX_UNAVAILABLE;

2377

2214

goto end;

2407

2244

exitcode = EX_USAGE;

2408

2245

goto end;

2409

2246

}

2410

2247

2411

2248

if(quit_now){

2412

2249

goto end;

2413

2250

}

2434

2271

}

2435

2272

2436

2273

while(not quit_now){

2437

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

2438

&mc);

2274

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

2439

2275

if(quit_now or ret == 0){

2440

2276

break;

2441

2277

}

2443

2279

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

2444

2280

(int)retry_interval);

2445

2281

}

2446

sleep((unsigned int)retry_interval);

2282

sleep((int)retry_interval);

2447

2283

}

2448

2284

2449

if(not quit_now){

2285

if (not quit_now){

2450

2286

exitcode = EXIT_SUCCESS;

2451

2287

}

2452

2288

2489

2325

/* Create the Avahi service browser */

2490

2326

sb = avahi_s_service_browser_new(mc.server, if_index,

2491

2327

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2492

NULL, 0, browse_callback,

2493

(void *)&mc);

2328

NULL, 0, browse_callback, NULL);

2494

2329

if(sb == NULL){

2495

2330

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

2496

2331

avahi_strerror(avahi_server_errno(mc.server)));

2507

2342

if(debug){

2508

2343

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

2509

2344

}

2510

2345

2511

2346

ret = avahi_loop_with_timeout(simple_poll,

2512

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

2347

(int)(retry_interval * 1000));

2513

2348

if(debug){

2514

2349

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

2515

2350

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

2522

2357

}

2523

2358

2524

2359

/* Cleanup things */

2525

free(mc.interfaces);

2526

2527

2360

if(sb != NULL)

2528

2361

avahi_s_service_browser_free(sb);

2529

2362

2554

2387

}

2555

2388

}

2556

2389

2557

/* Re-raise privileges */

2390

/* Re-raise priviliges */

2558

2391

{

2559

ret_errno = raise_privileges();

2560

if(ret_errno != 0){

2561

errno = ret_errno;

2562

perror_plus("Failed to raise privileges");

2563

} else {

2564

2565

/* Run network hooks */

2566

run_network_hooks("stop", interfaces_hooks != NULL ?

2567

interfaces_hooks : "", delay);

2568

2569

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

2570

{

2571

char *interface = NULL;

2572

while((interface=argz_next(interfaces_to_take_down,

2573

interfaces_to_take_down_size,

2574

interface))){

2575

ret_errno = take_down_interface(interface);

2576

if(ret_errno != 0){

2577

errno = ret_errno;

2578

perror_plus("Failed to take down interface");

2579

}

2580

}

2581

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

2582

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

2583

" down\n");

2584

}

2585

}

2586

}

2587

2588

ret_errno = lower_privileges_permanently();

2589

if(ret_errno != 0){

2590

errno = ret_errno;

2591

perror_plus("Failed to lower privileges permanently");

2592

}

2392

raise_privileges();

2393

2394

/* Run network hooks */

2395

run_network_hooks("stop", interfaces_hooks != NULL ?

2396

interfaces_hooks : "", delay);

2397

2398

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

2399

{

2400

char *interface = NULL;

2401

while((interface=argz_next(interfaces_to_take_down,

2402

interfaces_to_take_down_size,

2403

interface))){

2404

ret_errno = take_down_interface(interface);

2405

if(ret_errno != 0){

2406

errno = ret_errno;

2407

perror_plus("Failed to take down interface");

2408

}

2409

}

2410

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

2411

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

2412

" down\n");

2413

}

2414

}

2415

2416

lower_privileges_permanently();

2593

2417

}

2594

2418

2595

2419

free(interfaces_to_take_down);

2596

2420

free(interfaces_hooks);

2597

2421

2598

2422

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

2599

if(tempdir != NULL){

2423

if(tempdir_created){

2600

2424

struct dirent **direntries = NULL;

2601

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

2602

O_NOFOLLOW));

2603

if(tempdir_fd == -1){

2604

perror_plus("open");

2605

} else {

2606

#ifdef __GLIBC__

2607

#if __GLIBC_PREREQ(2, 15)

2608

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

2609

notdotentries, alphasort);

2610

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

2611

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

2612

alphasort);

2613

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

2614

#else /* not __GLIBC__ */

2615

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

2616

alphasort);

2617

#endif /* not __GLIBC__ */

2618

if(numentries >= 0){

2619

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

2620

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

2621

if(ret == -1){

2622

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

2623

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

2624

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

2625

}

2626

}

2627

2628

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

2629

free(direntries);

2630

if(numentries == -1){

2631

perror_plus("scandir");

2632

}

2633

ret = rmdir(tempdir);

2634

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

2635

perror_plus("rmdir");

2636

}

2425

struct dirent *direntry = NULL;

2426

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

2427

alphasort);

2428

if (numentries > 0){

2429

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

2430

direntry = direntries[i];

2431

char *fullname = NULL;

2432

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

2433

direntry->d_name);

2434

if(ret < 0){

2435

perror_plus("asprintf");

2436

continue;

2437

}

2438

ret = remove(fullname);

2439

if(ret == -1){

2440

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

2441

strerror(errno));

2442

}

2443

free(fullname);

2637

2444

}

2638

TEMP_FAILURE_RETRY(close(tempdir_fd));

2445

}

2446

2447

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

2448

free(direntries);

2449

if (numentries == -1){

2450

perror_plus("scandir");

2451

}

2452

ret = rmdir(tempdir);

2453

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

2454

perror_plus("rmdir");

2639

2455

}

2640

2456

}

2641

2457