/mandos/release : revision 237.7.290

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

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

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42

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

43

stdout, ferror(), remove() */

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stdout, ferror() */

44

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

45

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

46

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

55

opendir(), DIR */

56

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

57

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

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inet_pton(), connect() */

59

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

58

inet_pton(), connect(),

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getnameinfo() */

60

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

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61

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

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62

*/

62

63

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

72

73

*/

73

74

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

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

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

76

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

76

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

77

unlinkat() */

78

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

77

79

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

78

80

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

79

81

argp_state, struct argp,

91

93

argz_delete(), argz_append(),

92

94

argz_stringify(), argz_add(),

93

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

94

98

95

99

#ifdef __linux__

96

100

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

138

142

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

139

143

char *connect_to = NULL;

140

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

141

146

uid_t uid = 65534;

142

147

gid_t gid = 65534;

143

148

154

159

155

160

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

156

161

typedef struct {

157

AvahiSimplePoll *simple_poll;

158

162

AvahiServer *server;

159

163

gnutls_certificate_credentials_t cred;

160

164

unsigned int dh_bits;

162

166

const char *priority;

163

167

gpgme_ctx_t ctx;

164

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

165

171

} mandos_context;

166

172

167

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

168

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

169

.dh_bits = 1024, .priority = "SECURE256"

170

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

171

.current_server = NULL };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

172

175

173

176

sig_atomic_t quit_now = 0;

174

177

int signal_received = 0;

182

185

perror(print_text);

183

186

}

184

187

185

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

188

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

186

189

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

187

190

va_list ap;

188

191

va_start (ap, format);

189

192

190

193

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

191

194

program_invocation_short_name));

192

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

195

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

193

196

}

194

197

195

198

/*

197

200

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

198

201

* "buffer_length" is how much is already used.

199

202

*/

203

__attribute__((nonnull, warn_unused_result))

200

204

size_t incbuffer(char **buffer, size_t buffer_length,

201

205

size_t buffer_capacity){

202

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

203

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

204

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

205

213

return 0;

206

214

}

215

*buffer = new_buf;

207

216

buffer_capacity += BUFFER_SIZE;

208

217

}

209

218

return buffer_capacity;

210

219

}

211

220

212

221

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

222

__attribute__((nonnull, warn_unused_result))

213

223

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

214

int af){

224

int af, server **current_server){

215

225

int ret;

216

226

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

217

227

if(new_server == NULL){

224

234

.af = af };

225

235

if(new_server->ip == NULL){

226

236

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

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

227

252

return false;

228

253

}

229

254

/* Special case of first server */

230

if (mc.current_server == NULL){

255

if(*current_server == NULL){

231

256

new_server->next = new_server;

232

257

new_server->prev = new_server;

233

mc.current_server = new_server;

234

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

258

*current_server = new_server;

235

259

} else {

236

new_server->next = mc.current_server;

237

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

260

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

261

new_server->next = *current_server;

262

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

238

263

new_server->prev->next = new_server;

239

mc.current_server->prev = new_server;

240

}

241

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

242

if(ret == -1){

243

perror_plus("clock_gettime");

244

return false;

264

(*current_server)->prev = new_server;

245

265

}

246

266

return true;

247

267

}

249

269

/*

250

270

* Initialize GPGME.

251

271

*/

252

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

253

const char *tempdir){

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

274

const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

254

277

gpgme_error_t rc;

255

278

gpgme_engine_info_t engine_info;

256

279

257

258

280

/*

259

281

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

260

282

*/

261

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

262

284

int ret;

263

285

int fd;

264

286

gpgme_data_t pgp_data;

276

298

return false;

277

299

}

278

300

279

rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

280

302

if(rc != GPG_ERR_NO_ERROR){

281

303

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

282

304

gpgme_strsource(rc), gpgme_strerror(rc));

326

348

}

327

349

328

350

/* Create new GPGME "context" */

329

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

351

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

330

352

if(rc != GPG_ERR_NO_ERROR){

331

353

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

332

354

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

345

367

* Decrypt OpenPGP data.

346

368

* Returns -1 on error

347

369

*/

370

__attribute__((nonnull, warn_unused_result))

348

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

349

372

size_t crypto_size,

350

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

351

375

gpgme_data_t dh_crypto, dh_plain;

352

376

gpgme_error_t rc;

353

377

ssize_t ret;

379

403

380

404

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

381

405

data buffer */

382

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

406

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

383

407

if(rc != GPG_ERR_NO_ERROR){

384

408

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

385

409

gpgme_strsource(rc), gpgme_strerror(rc));

386

410

plaintext_length = -1;

387

411

if(debug){

388

412

gpgme_decrypt_result_t result;

389

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

390

414

if(result == NULL){

391

415

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

392

416

} else {

469

493

return plaintext_length;

470

494

}

471

495

472

static const char * safer_gnutls_strerror(int value){

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

473

498

const char *ret = gnutls_strerror(value);

474

499

if(ret == NULL)

475

500

ret = "(unknown)";

477

502

}

478

503

479

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

480

506

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

481

507

const char* string){

482

508

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

483

509

}

484

510

511

__attribute__((nonnull, warn_unused_result))

485

512

static int init_gnutls_global(const char *pubkeyfilename,

486

const char *seckeyfilename){

513

const char *seckeyfilename,

514

mandos_context *mc){

487

515

int ret;

488

516

489

517

if(debug){

506

534

}

507

535

508

536

/* OpenPGP credentials */

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

510

538

if(ret != GNUTLS_E_SUCCESS){

511

539

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

512

540

safer_gnutls_strerror(ret));

522

550

}

523

551

524

552

ret = gnutls_certificate_set_openpgp_key_file

525

(mc.cred, pubkeyfilename, seckeyfilename,

553

(mc->cred, pubkeyfilename, seckeyfilename,

526

554

GNUTLS_OPENPGP_FMT_BASE64);

527

555

if(ret != GNUTLS_E_SUCCESS){

528

556

fprintf_plus(stderr,

534

562

}

535

563

536

564

/* GnuTLS server initialization */

537

ret = gnutls_dh_params_init(&mc.dh_params);

565

ret = gnutls_dh_params_init(&mc->dh_params);

538

566

if(ret != GNUTLS_E_SUCCESS){

539

567

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

540

568

" initialization: %s\n",

541

569

safer_gnutls_strerror(ret));

542

570

goto globalfail;

543

571

}

544

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

572

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

545

573

if(ret != GNUTLS_E_SUCCESS){

546

574

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

547

575

safer_gnutls_strerror(ret));

548

576

goto globalfail;

549

577

}

550

578

551

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

579

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

552

580

553

581

return 0;

554

582

555

583

globalfail:

556

584

557

gnutls_certificate_free_credentials(mc.cred);

585

gnutls_certificate_free_credentials(mc->cred);

558

586

gnutls_global_deinit();

559

gnutls_dh_params_deinit(mc.dh_params);

587

gnutls_dh_params_deinit(mc->dh_params);

560

588

return -1;

561

589

}

562

590

563

static int init_gnutls_session(gnutls_session_t *session){

591

__attribute__((nonnull, warn_unused_result))

592

static int init_gnutls_session(gnutls_session_t *session,

593

mandos_context *mc){

564

594

int ret;

565

595

/* GnuTLS session creation */

566

596

do {

578

608

{

579

609

const char *err;

580

610

do {

581

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

611

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

582

612

if(quit_now){

583

613

gnutls_deinit(*session);

584

614

return -1;

595

625

596

626

do {

597

627

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc.cred);

628

mc->cred);

599

629

if(quit_now){

600

630

gnutls_deinit(*session);

601

631

return -1;

611

641

/* ignore client certificate if any. */

612

642

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

643

614

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

645

616

646

return 0;

617

647

}

621

651

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

622

652

623

653

/* Called when a Mandos server is found */

654

__attribute__((nonnull, warn_unused_result))

624

655

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

625

656

AvahiIfIndex if_index,

626

int af){

657

int af, mandos_context *mc){

627

658

int ret, tcp_sd = -1;

628

659

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

660

struct sockaddr_storage to;

633

661

char *buffer = NULL;

634

662

char *decrypted_buffer = NULL;

635

663

size_t buffer_length = 0;

659

687

return -1;

660

688

}

661

689

662

ret = init_gnutls_session(&session);

690

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

691

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

692

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

693

bool match = false;

694

{

695

char *interface = NULL;

696

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

697

interface))){

698

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

699

match = true;

700

break;

701

}

702

}

703

}

704

if(not match){

705

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

706

connect to the server */

707

if(debug){

708

char interface[IF_NAMESIZE];

709

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

710

perror_plus("if_indextoname");

711

} else {

712

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

713

" \"%s\"\n",

714

if_indextoname((unsigned int)if_index,

715

interface));

716

}

717

}

718

return -1;

719

}

720

}

721

722

ret = init_gnutls_session(&session, mc);

663

723

if(ret != 0){

664

724

return -1;

665

725

}

684

744

685

745

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

686

746

if(af == AF_INET6){

687

to.in6.sin6_family = (sa_family_t)af;

688

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

747

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

748

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

689

749

} else { /* IPv4 */

690

to.in.sin_family = (sa_family_t)af;

691

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

750

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

751

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

692

752

}

693

753

if(ret < 0 ){

694

754

int e = errno;

703

763

goto mandos_end;

704

764

}

705

765

if(af == AF_INET6){

706

to.in6.sin6_port = htons(port);

707

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

708

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

709

-Wunreachable-code*/

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

710

769

if(if_index == AVAHI_IF_UNSPEC){

711

770

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

712

771

" incomplete without a network interface\n");

714

773

goto mandos_end;

715

774

}

716

775

/* Set the network interface number as scope */

717

to.in6.sin6_scope_id = (uint32_t)if_index;

776

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

718

777

}

719

778

} else {

720

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

721

-Wconversion and

722

-Wunreachable-code */

779

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

723

780

}

724

781

725

782

if(quit_now){

742

799

}

743

800

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

744

801

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

745

const char *pcret;

746

802

if(af == AF_INET6){

747

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

748

sizeof(addrstr));

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

749

807

} else {

750

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

751

sizeof(addrstr));

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

752

812

}

753

if(pcret == NULL){

754

perror_plus("inet_ntop");

755

} else {

756

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

757

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

758

}

813

if(ret == EAI_SYSTEM){

814

perror_plus("getnameinfo");

815

} else if(ret != 0) {

816

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

817

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

818

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

759

819

}

760

820

}

761

821

765

825

}

766

826

767

827

if(af == AF_INET6){

768

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

828

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

829

sizeof(struct sockaddr_in6));

769

830

} else {

770

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

831

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

832

sizeof(struct sockaddr_in));

771

833

}

772

834

if(ret < 0){

773

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

835

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

774

836

int e = errno;

775

837

perror_plus("connect");

776

838

errno = e;

937

999

if(buffer_length > 0){

938

1000

ssize_t decrypted_buffer_size;

939

1001

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

940

&decrypted_buffer);

1002

&decrypted_buffer, mc);

941

1003

if(decrypted_buffer_size >= 0){

942

1004

943

1005

written = 0;

991

1053

return retval;

992

1054

}

993

1055

1056

__attribute__((nonnull))

994

1057

static void resolve_callback(AvahiSServiceResolver *r,

995

1058

AvahiIfIndex interface,

996

1059

AvahiProtocol proto,

1004

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

1005

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

1069

flags,

1007

AVAHI_GCC_UNUSED void* userdata){

1070

void *mc){

1008

1071

if(r == NULL){

1009

1072

return;

1010

1073

}

1013

1076

timed out */

1014

1077

1015

1078

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1016

1080

return;

1017

1081

}

1018

1082

1022

1086

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

1023

1087

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

1024

1088

domain,

1025

avahi_strerror(avahi_server_errno(mc.server)));

1089

avahi_strerror(avahi_server_errno

1090

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

1026

1091

break;

1027

1092

1028

1093

case AVAHI_RESOLVER_FOUND:

1036

1101

}

1037

1102

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

1038

1103

interface,

1039

avahi_proto_to_af(proto));

1104

avahi_proto_to_af(proto),

1105

mc);

1040

1106

if(ret == 0){

1041

avahi_simple_poll_quit(mc.simple_poll);

1107

avahi_simple_poll_quit(simple_poll);

1042

1108

} else {

1043

1109

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

1044

avahi_proto_to_af(proto))){

1110

avahi_proto_to_af(proto),

1111

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

1045

1112

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

1046

1113

" list\n", name);

1047

1114

}

1060

1127

const char *domain,

1061

1128

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

1129

flags,

1063

AVAHI_GCC_UNUSED void* userdata){

1130

void *mc){

1064

1131

if(b == NULL){

1065

1132

return;

1066

1133

}

1077

1144

case AVAHI_BROWSER_FAILURE:

1078

1145

1079

1146

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1147

avahi_strerror(avahi_server_errno

1148

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

1149

avahi_simple_poll_quit(simple_poll);

1082

1150

return;

1083

1151

1084

1152

case AVAHI_BROWSER_NEW:

1087

1155

the callback function is called the Avahi server will free the

1088

1156

resolver for us. */

1089

1157

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1158

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

1159

interface, protocol, name, type,

1160

domain, protocol, 0,

1161

resolve_callback, mc) == NULL)

1093

1162

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

1094

1163

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1164

avahi_strerror(avahi_server_errno

1165

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

1096

1166

break;

1097

1167

1098

1168

case AVAHI_BROWSER_REMOVE:

1117

1187

signal_received = sig;

1118

1188

int old_errno = errno;

1119

1189

/* set main loop to exit */

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1190

if(simple_poll != NULL){

1191

avahi_simple_poll_quit(simple_poll);

1122

1192

}

1123

1193

errno = old_errno;

1124

1194

}

1125

1195

1196

__attribute__((nonnull, warn_unused_result))

1126

1197

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

1127

1198

int ret;

1128

1199

error_t ret_errno;

1147

1218

return true;

1148

1219

}

1149

1220

1221

__attribute__((nonnull, warn_unused_result))

1150

1222

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

1151

1223

1152

1224

/* Reject the loopback device */

1194

1266

* corresponds to an acceptable network device.

1195

1267

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

1196

1268

*/

1269

__attribute__((nonnull, warn_unused_result))

1197

1270

int good_interface(const struct dirent *if_entry){

1198

1271

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

1199

1272

return 0;

1217

1290

/*

1218

1291

* This function determines if a network interface is up.

1219

1292

*/

1293

__attribute__((nonnull, warn_unused_result))

1220

1294

bool interface_is_up(const char *interface){

1221

1295

struct ifreq ifr;

1222

1296

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

1233

1307

/*

1234

1308

* This function determines if a network interface is running

1235

1309

*/

1310

__attribute__((nonnull, warn_unused_result))

1236

1311

bool interface_is_running(const char *interface){

1237

1312

struct ifreq ifr;

1238

1313

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

1246

1321

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

1247

1322

}

1248

1323

1324

__attribute__((nonnull, pure, warn_unused_result))

1249

1325

int notdotentries(const struct dirent *direntry){

1250

1326

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

1251

1327

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

1258

1334

}

1259

1335

1260

1336

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

1337

__attribute__((nonnull, warn_unused_result))

1261

1338

int runnable_hook(const struct dirent *direntry){

1262

1339

int ret;

1263

1340

size_t sret;

1271

1348

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

1272

1349

"abcdefghijklmnopqrstuvwxyz"

1273

1350

"0123456789"

1274

"_-");

1351

"_.-");

1275

1352

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

1276

1353

/* Contains non-allowed characters */

1277

1354

if(debug){

1281

1358

return 0;

1282

1359

}

1283

1360

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);

1361

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

1292

1362

if(ret == -1){

1293

1363

if(debug){

1294

1364

perror_plus("Could not stat hook");

1318

1388

return 1;

1319

1389

}

1320

1390

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1391

__attribute__((nonnull, warn_unused_result))

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

mandos_context *mc){

1322

1394

int ret;

1323

1395

struct timespec now;

1324

1396

struct timespec waited_time;

1325

1397

intmax_t block_time;

1326

1398

1327

1399

while(true){

1328

if(mc.current_server == NULL){

1329

if (debug){

1400

if(mc->current_server == NULL){

1401

if(debug){

1330

1402

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

1331

1403

" No timeout!\n");

1332

1404

}

1333

1405

ret = avahi_simple_poll_iterate(s, -1);

1334

1406

} else {

1335

if (debug){

1407

if(debug){

1336

1408

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

1337

1409

" it, or wait\n");

1338

1410

}

1345

1417

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

1346

1418

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

1347

1419

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1420

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

1349

1421

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1422

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

1351

1423

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

1352

1424

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

1353

1425

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

1355

1427

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

1356

1428

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

1357

1429

1358

if (debug){

1430

if(debug){

1359

1431

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

1360

1432

block_time);

1361

1433

}

1362

1434

1363

1435

if(block_time <= 0){

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);

1436

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

1437

mc->current_server->port,

1438

mc->current_server->if_index,

1439

mc->current_server->af, mc);

1368

1440

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1441

avahi_simple_poll_quit(s);

1370

1442

return 0;

1371

1443

}

1372

1444

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1445

&mc->current_server->last_seen);

1374

1446

if(ret == -1){

1375

1447

perror_plus("clock_gettime");

1376

1448

return -1;

1377

1449

}

1378

mc.current_server = mc.current_server->next;

1450

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

1379

1451

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

1380

1452

servers, but don't block */

1381

1453

}

1383

1455

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

1384

1456

}

1385

1457

if(ret != 0){

1386

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

1458

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

1387

1459

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

1388

1460

}

1389

1461

}

1391

1463

}

1392

1464

1393

1465

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

1466

__attribute__((warn_unused_result))

1394

1467

error_t raise_privileges(void){

1395

1468

error_t old_errno = errno;

1396

1469

error_t ret_errno = 0;

1397

1470

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

1398

1471

ret_errno = errno;

1399

perror_plus("seteuid");

1400

1472

}

1401

1473

errno = old_errno;

1402

1474

return ret_errno;

1403

1475

}

1404

1476

1405

1477

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

1478

__attribute__((warn_unused_result))

1406

1479

error_t raise_privileges_permanently(void){

1407

1480

error_t old_errno = errno;

1408

1481

error_t ret_errno = raise_privileges();

1412

1485

}

1413

1486

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

1414

1487

ret_errno = errno;

1415

perror_plus("seteuid");

1416

1488

}

1417

1489

errno = old_errno;

1418

1490

return ret_errno;

1419

1491

}

1420

1492

1421

1493

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

1494

__attribute__((warn_unused_result))

1422

1495

error_t lower_privileges(void){

1423

1496

error_t old_errno = errno;

1424

1497

error_t ret_errno = 0;

1425

1498

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

1426

1499

ret_errno = errno;

1427

perror_plus("seteuid");

1428

1500

}

1429

1501

errno = old_errno;

1430

1502

return ret_errno;

1431

1503

}

1432

1504

1433

1505

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1434

1507

error_t lower_privileges_permanently(void){

1435

1508

error_t old_errno = errno;

1436

1509

error_t ret_errno = 0;

1437

1510

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

1438

1511

ret_errno = errno;

1439

perror_plus("setuid");

1440

1512

}

1441

1513

errno = old_errno;

1442

1514

return ret_errno;

1443

1515

}

1444

1516

1445

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

1517

__attribute__((nonnull))

1518

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

1446

1519

const float delay){

1447

struct dirent **direntries;

1520

struct dirent **direntries = NULL;

1521

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1523

if(hookdir_fd == -1){

1524

if(errno == ENOENT){

1525

if(debug){

1526

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

1527

" found\n", hookdir);

1528

}

1529

} else {

1530

perror_plus("open");

1531

}

1532

return;

1533

}

1534

}

1535

#ifdef __GLIBC__

1536

#if __GLIBC_PREREQ(2, 15)

1537

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

1538

runnable_hook, alphasort);

1539

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

1540

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

1541

alphasort);

1542

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

1543

#else /* not __GLIBC__ */

1544

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

1545

alphasort);

1546

#endif /* not __GLIBC__ */

1547

if(numhooks == -1){

1548

perror_plus("scandir");

1549

return;

1550

}

1448

1551

struct dirent *direntry;

1449

1552

int ret;

1450

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

1451

alphasort);

1452

if(numhooks == -1){

1453

if(errno == ENOENT){

1454

if(debug){

1455

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

1456

" found\n", hookdir);

1457

}

1458

} else {

1459

perror_plus("scandir");

1553

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

1554

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

1555

direntry = direntries[i];

1556

if(debug){

1557

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

1558

direntry->d_name);

1460

1559

}

1461

} else {

1462

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

1463

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

1464

direntry = direntries[i];

1465

char *fullname = NULL;

1466

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

1467

if(ret < 0){

1560

pid_t hook_pid = fork();

1561

if(hook_pid == 0){

1562

/* Child */

1563

/* Raise privileges */

1564

errno = raise_privileges_permanently();

1565

if(errno != 0){

1566

perror_plus("Failed to raise privileges");

1567

_exit(EX_NOPERM);

1568

}

1569

/* Set group */

1570

errno = 0;

1571

ret = setgid(0);

1572

if(ret == -1){

1573

perror_plus("setgid");

1574

_exit(EX_NOPERM);

1575

}

1576

/* Reset supplementary groups */

1577

errno = 0;

1578

ret = setgroups(0, NULL);

1579

if(ret == -1){

1580

perror_plus("setgroups");

1581

_exit(EX_NOPERM);

1582

}

1583

ret = dup2(devnull, STDIN_FILENO);

1584

if(ret == -1){

1585

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

1586

_exit(EX_OSERR);

1587

}

1588

ret = close(devnull);

1589

if(ret == -1){

1590

perror_plus("close");

1591

_exit(EX_OSERR);

1592

}

1593

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1594

if(ret == -1){

1595

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

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

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

1604

if(ret == -1){

1605

perror_plus("setenv");

1606

_exit(EX_OSERR);

1607

}

1608

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

1609

if(ret == -1){

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1615

perror_plus("setenv");

1616

_exit(EX_OSERR);

1617

}

1618

char *delaystring;

1619

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

1620

if(ret == -1){

1468

1621

perror_plus("asprintf");

1469

continue;

1470

}

1471

if(debug){

1472

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

1473

direntry->d_name);

1474

}

1475

pid_t hook_pid = fork();

1476

if(hook_pid == 0){

1477

/* Child */

1478

/* Raise privileges */

1479

raise_privileges_permanently();

1480

/* Set group */

1481

errno = 0;

1482

ret = setgid(0);

1483

if(ret == -1){

1484

perror_plus("setgid");

1485

}

1486

/* Reset supplementary groups */

1487

errno = 0;

1488

ret = setgroups(0, NULL);

1489

if(ret == -1){

1490

perror_plus("setgroups");

1491

}

1492

dup2(devnull, STDIN_FILENO);

1493

close(devnull);

1494

dup2(STDERR_FILENO, STDOUT_FILENO);

1495

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

1496

if(ret == -1){

1497

perror_plus("setenv");

1498

_exit(EX_OSERR);

1499

}

1500

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

1501

if(ret == -1){

1502

perror_plus("setenv");

1503

_exit(EX_OSERR);

1504

}

1505

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

1506

if(ret == -1){

1507

perror_plus("setenv");

1508

_exit(EX_OSERR);

1509

}

1510

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

1511

if(ret == -1){

1512

perror_plus("setenv");

1513

_exit(EX_OSERR);

1514

}

1515

char *delaystring;

1516

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

1517

if(ret == -1){

1518

perror_plus("asprintf");

1519

_exit(EX_OSERR);

1520

}

1521

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

1522

if(ret == -1){

1523

free(delaystring);

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

1527

1626

free(delaystring);

1528

if(connect_to != NULL){

1529

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

1530

if(ret == -1){

1531

perror_plus("setenv");

1532

_exit(EX_OSERR);

1533

}

1534

}

1535

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

1536

perror_plus("execl");

1537

_exit(EXIT_FAILURE);

1538

}

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

free(delaystring);

1631

if(connect_to != NULL){

1632

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

1633

if(ret == -1){

1634

perror_plus("setenv");

1635

_exit(EX_OSERR);

1636

}

1637

}

1638

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

1639

if(hook_fd == -1){

1640

perror_plus("openat");

1641

_exit(EXIT_FAILURE);

1642

}

1643

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

1644

perror_plus("close");

1645

_exit(EXIT_FAILURE);

1646

}

1647

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

1648

environ) == -1){

1649

perror_plus("fexecve");

1650

_exit(EXIT_FAILURE);

1651

}

1652

} else {

1653

if(hook_pid == -1){

1654

perror_plus("fork");

1655

free(direntry);

1656

continue;

1657

}

1658

int status;

1659

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

1660

perror_plus("waitpid");

1661

free(direntry);

1662

continue;

1663

}

1664

if(WIFEXITED(status)){

1665

if(WEXITSTATUS(status) != 0){

1666

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

1667

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

1668

WEXITSTATUS(status));

1669

free(direntry);

1670

continue;

1671

}

1672

} else if(WIFSIGNALED(status)){

1673

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

1674

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

1675

WTERMSIG(status));

1676

free(direntry);

1677

continue;

1539

1678

} else {

1540

int status;

1541

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

1542

perror_plus("waitpid");

1543

free(fullname);

1544

continue;

1545

}

1546

if(WIFEXITED(status)){

1547

if(WEXITSTATUS(status) != 0){

1548

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

1549

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

1550

WEXITSTATUS(status));

1551

free(fullname);

1552

continue;

1553

}

1554

} else if(WIFSIGNALED(status)){

1555

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

1556

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

1557

WTERMSIG(status));

1558

free(fullname);

1559

continue;

1560

} else {

1561

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

1562

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

1563

free(fullname);

1564

continue;

1565

}

1566

}

1567

free(fullname);

1568

if(debug){

1569

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

1570

direntry->d_name);

1571

}

1572

}

1573

close(devnull);

1574

}

1575

return true;

1679

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

1680

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

1681

free(direntry);

1682

continue;

1683

}

1684

}

1685

if(debug){

1686

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

1687

direntry->d_name);

1688

}

1689

free(direntry);

1690

}

1691

free(direntries);

1692

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

1693

perror_plus("close");

1694

} else {

1695

hookdir_fd = -1;

1696

}

1697

close(devnull);

1576

1698

}

1577

1699

1700

__attribute__((nonnull, warn_unused_result))

1578

1701

error_t bring_up_interface(const char *const interface,

1579

1702

const float delay){

1580

int sd = -1;

1581

1703

error_t old_errno = errno;

1582

error_t ret_errno = 0;

1583

int ret, ret_setflags;

1704

int ret;

1584

1705

struct ifreq network;

1585

1706

unsigned int if_index = if_nametoindex(interface);

1586

1707

if(if_index == 0){

1595

1716

}

1596

1717

1597

1718

if(not interface_is_up(interface)){

1598

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

1719

error_t ret_errno = 0, ioctl_errno = 0;

1720

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

1599

1721

ret_errno = errno;

1600

1722

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

1601

1723

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

1724

errno = old_errno;

1602

1725

return ret_errno;

1603

1726

}

1604

network.ifr_flags |= IFF_UP;

1727

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

1605

1728

1606

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1607

if(sd < 0){

1729

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

1730

if(sd == -1){

1608

1731

ret_errno = errno;

1609

1732

perror_plus("socket");

1610

1733

errno = old_errno;

1611

1734

return ret_errno;

1612

1735

}

1613

1736

1614

1737

if(quit_now){

1615

close(sd);

1738

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

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1616

1742

errno = old_errno;

1617

1743

return EINTR;

1618

1744

}

1622

1748

interface);

1623

1749

}

1624

1750

1625

/* Raise priviliges */

1626

raise_privileges();

1751

/* Raise privileges */

1752

ret_errno = raise_privileges();

1753

if(ret_errno != 0){

1754

errno = ret_errno;

1755

perror_plus("Failed to raise privileges");

1756

}

1627

1757

1628

1758

#ifdef __linux__

1629

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1630

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

1631

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

1632

bool restore_loglevel = true;

1633

if(ret_linux == -1){

1634

restore_loglevel = false;

1635

perror_plus("klogctl");

1759

int ret_linux;

1760

bool restore_loglevel = false;

1761

if(ret_errno == 0){

1762

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1763

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

1764

ret_linux = klogctl(8, NULL, 5);

1765

if(ret_linux == -1){

1766

perror_plus("klogctl");

1767

} else {

1768

restore_loglevel = true;

1769

}

1636

1770

}

1637

1771

#endif /* __linux__ */

1638

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

1639

ret_errno = errno;

1772

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

1773

ioctl_errno = errno;

1640

1774

#ifdef __linux__

1641

1775

if(restore_loglevel){

1642

1776

ret_linux = klogctl(7, NULL, 0);

1646

1780

}

1647

1781

#endif /* __linux__ */

1648

1782

1649

/* Lower privileges */

1650

lower_privileges();

1783

/* If raise_privileges() succeeded above */

1784

if(ret_errno == 0){

1785

/* Lower privileges */

1786

ret_errno = lower_privileges();

1787

if(ret_errno != 0){

1788

errno = ret_errno;

1789

perror_plus("Failed to lower privileges");

1790

}

1791

}

1651

1792

1652

1793

/* Close the socket */

1653

1794

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

1656

1797

}

1657

1798

1658

1799

if(ret_setflags == -1){

1659

errno = ret_errno;

1800

errno = ioctl_errno;

1660

1801

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1661

1802

errno = old_errno;

1662

return ret_errno;

1803

return ioctl_errno;

1663

1804

}

1664

1805

} else if(debug){

1665

1806

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

1683

1824

return 0;

1684

1825

}

1685

1826

1827

__attribute__((nonnull, warn_unused_result))

1686

1828

error_t take_down_interface(const char *const interface){

1687

int sd = -1;

1688

1829

error_t old_errno = errno;

1689

error_t ret_errno = 0;

1690

int ret, ret_setflags;

1691

1830

struct ifreq network;

1692

1831

unsigned int if_index = if_nametoindex(interface);

1693

1832

if(if_index == 0){

1696

1835

return ENXIO;

1697

1836

}

1698

1837

if(interface_is_up(interface)){

1838

error_t ret_errno = 0, ioctl_errno = 0;

1699

1839

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

1700

1840

ret_errno = errno;

1701

1841

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

1702

1842

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

1843

errno = old_errno;

1703

1844

return ret_errno;

1704

1845

}

1705

1846

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

1706

1847

1707

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1708

if(sd < 0){

1848

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

1849

if(sd == -1){

1709

1850

ret_errno = errno;

1710

1851

perror_plus("socket");

1711

1852

errno = old_errno;

1717

1858

interface);

1718

1859

}

1719

1860

1720

/* Raise priviliges */

1721

raise_privileges();

1722

1723

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

1724

ret_errno = errno;

1725

1726

/* Lower privileges */

1727

lower_privileges();

1861

/* Raise privileges */

1862

ret_errno = raise_privileges();

1863

if(ret_errno != 0){

1864

errno = ret_errno;

1865

perror_plus("Failed to raise privileges");

1866

}

1867

1868

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

1869

ioctl_errno = errno;

1870

1871

/* If raise_privileges() succeeded above */

1872

if(ret_errno == 0){

1873

/* Lower privileges */

1874

ret_errno = lower_privileges();

1875

if(ret_errno != 0){

1876

errno = ret_errno;

1877

perror_plus("Failed to lower privileges");

1878

}

1879

}

1728

1880

1729

1881

/* Close the socket */

1730

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

1882

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

1731

1883

if(ret == -1){

1732

1884

perror_plus("close");

1733

1885

}

1734

1886

1735

1887

if(ret_setflags == -1){

1736

errno = ret_errno;

1888

errno = ioctl_errno;

1737

1889

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1738

1890

errno = old_errno;

1739

return ret_errno;

1891

return ioctl_errno;

1740

1892

}

1741

1893

} else if(debug){

1742

1894

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

1748

1900

}

1749

1901

1750

1902

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

1903

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

1904

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

1905

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

1906

.interfaces = NULL, .interfaces_size = 0 };

1751

1907

AvahiSServiceBrowser *sb = NULL;

1752

1908

error_t ret_errno;

1753

1909

int ret;

1754

1910

intmax_t tmpmax;

1755

1911

char *tmp;

1756

1912

int exitcode = EXIT_SUCCESS;

1757

char *interfaces = NULL;

1758

size_t interfaces_size = 0;

1759

1913

char *interfaces_to_take_down = NULL;

1760

1914

size_t interfaces_to_take_down_size = 0;

1761

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

1762

bool tempdir_created = false;

1915

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

1916

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

1917

char *tempdir = NULL;

1763

1918

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1764

1919

const char *seckey = PATHDIR "/" SECKEY;

1765

1920

const char *pubkey = PATHDIR "/" PUBKEY;

1766

1921

char *interfaces_hooks = NULL;

1767

size_t interfaces_hooks_size = 0;

1768

1922

1769

1923

bool gnutls_initialized = false;

1770

1924

bool gpgme_initialized = false;

1861

2015

connect_to = arg;

1862

2016

break;

1863

2017

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

1864

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

1865

(int)',');

2018

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

2019

arg, (int)',');

1866

2020

if(ret_errno != 0){

1867

2021

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

1868

2022

}

1948

2102

/* Work around Debian bug #633582:

1949

2103

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

1950

2104

1951

/* Re-raise priviliges */

1952

if(raise_privileges() == 0){

2105

/* Re-raise privileges */

2106

ret_errno = raise_privileges();

2107

if(ret_errno != 0){

2108

errno = ret_errno;

2109

perror_plus("Failed to raise privileges");

2110

} else {

1953

2111

struct stat st;

1954

2112

1955

2113

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

1995

2153

}

1996

2154

1997

2155

/* Lower privileges */

1998

errno = 0;

1999

ret = seteuid(uid);

2000

if(ret == -1){

2001

perror_plus("seteuid");

2156

ret_errno = lower_privileges();

2157

if(ret_errno != 0){

2158

errno = ret_errno;

2159

perror_plus("Failed to lower privileges");

2002

2160

}

2003

2161

}

2004

2162

}

2005

2163

2006

/* Remove empty interface names */

2164

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

2007

2165

{

2008

2166

char *interface = NULL;

2009

while((interface = argz_next(interfaces, interfaces_size,

2167

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

2010

2168

interface))){

2011

if(if_nametoindex(interface) == 0){

2012

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

2169

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

2170

and if_nametoindex(interface) == 0){

2171

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

2013

2172

fprintf_plus(stderr, "Not using nonexisting interface"

2014

2173

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

2015

2174

}

2016

argz_delete(&interfaces, &interfaces_size, interface);

2175

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

2017

2176

interface = NULL;

2018

2177

}

2019

2178

}

2021

2180

2022

2181

/* Run network hooks */

2023

2182

{

2024

2025

if(interfaces != NULL){

2026

interfaces_hooks = malloc(interfaces_size);

2183

if(mc.interfaces != NULL){

2184

interfaces_hooks = malloc(mc.interfaces_size);

2027

2185

if(interfaces_hooks == NULL){

2028

2186

perror_plus("malloc");

2029

2187

goto end;

2030

2188

}

2031

memcpy(interfaces_hooks, interfaces, interfaces_size);

2032

interfaces_hooks_size = interfaces_size;

2033

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2034

(int)',');

2035

}

2036

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

2037

interfaces_hooks : "", delay)){

2038

goto end;

2039

}

2189

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

2190

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

2191

}

2192

run_network_hooks("start", interfaces_hooks != NULL ?

2193

interfaces_hooks : "", delay);

2040

2194

}

2041

2195

2042

2196

if(not debug){

2047

2201

from the signal handler */

2048

2202

/* Initialize the pseudo-RNG for Avahi */

2049

2203

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

2050

mc.simple_poll = avahi_simple_poll_new();

2051

if(mc.simple_poll == NULL){

2204

simple_poll = avahi_simple_poll_new();

2205

if(simple_poll == NULL){

2052

2206

fprintf_plus(stderr,

2053

2207

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

2054

2208

exitcode = EX_UNAVAILABLE;

2119

2273

}

2120

2274

2121

2275

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

2122

if(interfaces == NULL){

2123

struct dirent **direntries;

2276

if(mc.interfaces == NULL){

2277

struct dirent **direntries = NULL;

2124

2278

/* Look for any good interfaces */

2125

2279

ret = scandir(sys_class_net, &direntries, good_interface,

2126

2280

alphasort);

2127

2281

if(ret >= 1){

2128

2282

/* Add all found interfaces to interfaces list */

2129

2283

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

2130

ret_errno = argz_add(&interfaces, &interfaces_size,

2284

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

2131

2285

direntries[i]->d_name);

2132

2286

if(ret_errno != 0){

2287

errno = ret_errno;

2133

2288

perror_plus("argz_add");

2289

free(direntries[i]);

2134

2290

continue;

2135

2291

}

2136

2292

if(debug){

2137

2293

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

2138

2294

direntries[i]->d_name);

2139

2295

}

2296

free(direntries[i]);

2140

2297

}

2141

2298

free(direntries);

2142

2299

} else {

2143

free(direntries);

2300

if(ret == 0){

2301

free(direntries);

2302

}

2144

2303

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

2145

2304

exitcode = EXIT_FAILURE;

2146

2305

goto end;

2147

2306

}

2148

2307

}

2149

2308

2150

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

2151

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

2152

if(debug){

2153

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

2154

interfaces);

2155

}

2156

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2157

}

2158

2159

/* Bring up interfaces which are down */

2160

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

2161

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

2309

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

2310

{

2162

2311

char *interface = NULL;

2163

while((interface = argz_next(interfaces, interfaces_size,

2312

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

2164

2313

interface))){

2314

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

2315

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

2316

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

2317

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

2318

interface);

2319

interface = NULL;

2320

while((interface = argz_next(mc.interfaces,

2321

mc.interfaces_size, interface))){

2322

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

2323

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

2324

interface);

2325

interface = NULL;

2326

}

2327

}

2328

break;

2329

}

2165

2330

bool interface_was_up = interface_is_up(interface);

2166

ret = bring_up_interface(interface, delay);

2331

errno = bring_up_interface(interface, delay);

2167

2332

if(not interface_was_up){

2168

if(ret != 0){

2169

errno = ret;

2333

if(errno != 0){

2170

2334

perror_plus("Failed to bring up interface");

2171

2335

} else {

2172

ret_errno = argz_add(&interfaces_to_take_down,

2173

&interfaces_to_take_down_size,

2174

interface);

2336

errno = argz_add(&interfaces_to_take_down,

2337

&interfaces_to_take_down_size,

2338

interface);

2339

if(errno != 0){

2340

perror_plus("argz_add");

2341

}

2175

2342

}

2176

2343

}

2177

2344

}

2178

free(interfaces);

2179

interfaces = NULL;

2180

interfaces_size = 0;

2181

2345

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

2182

2346

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

2183

2347

}

2184

2348

}

2185

2349

2350

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

2351

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

2352

if(debug){

2353

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

2354

mc.interfaces);

2355

}

2356

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

2357

}

2358

2186

2359

if(quit_now){

2187

2360

goto end;

2188

2361

}

2189

2362

2190

ret = init_gnutls_global(pubkey, seckey);

2363

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

2191

2364

if(ret == -1){

2192

2365

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

2193

2366

exitcode = EX_UNAVAILABLE;

2200

2373

goto end;

2201

2374

}

2202

2375

2203

if(mkdtemp(tempdir) == NULL){

2376

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

2377

tempdir = mkdtemp(run_tempdir);

2378

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

2379

if(debug){

2380

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

2381

run_tempdir, old_tempdir);

2382

}

2383

tempdir = mkdtemp(old_tempdir);

2384

}

2385

if(tempdir == NULL){

2204

2386

perror_plus("mkdtemp");

2205

2387

goto end;

2206

2388

}

2207

tempdir_created = true;

2208

2389

2209

2390

if(quit_now){

2210

2391

goto end;

2211

2392

}

2212

2393

2213

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

2394

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

2214

2395

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

2215

2396

exitcode = EX_UNAVAILABLE;

2216

2397

goto end;

2246

2427

exitcode = EX_USAGE;

2247

2428

goto end;

2248

2429

}

2249

2430

2250

2431

if(quit_now){

2251

2432

goto end;

2252

2433

}

2273

2454

}

2274

2455

2275

2456

while(not quit_now){

2276

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

2457

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

2458

&mc);

2277

2459

if(quit_now or ret == 0){

2278

2460

break;

2279

2461

}

2281

2463

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

2282

2464

(int)retry_interval);

2283

2465

}

2284

sleep((int)retry_interval);

2466

sleep((unsigned int)retry_interval);

2285

2467

}

2286

2468

2287

if (not quit_now){

2469

if(not quit_now){

2288

2470

exitcode = EXIT_SUCCESS;

2289

2471

}

2290

2472

2305

2487

config.publish_domain = 0;

2306

2488

2307

2489

/* Allocate a new server */

2308

mc.server = avahi_server_new(avahi_simple_poll_get

2309

(mc.simple_poll), &config, NULL,

2310

NULL, &ret_errno);

2490

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2491

&config, NULL, NULL, &ret_errno);

2311

2492

2312

2493

/* Free the Avahi configuration data */

2313

2494

avahi_server_config_free(&config);

2328

2509

/* Create the Avahi service browser */

2329

2510

sb = avahi_s_service_browser_new(mc.server, if_index,

2330

2511

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2331

NULL, 0, browse_callback, NULL);

2512

NULL, 0, browse_callback,

2513

(void *)&mc);

2332

2514

if(sb == NULL){

2333

2515

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

2334

2516

avahi_strerror(avahi_server_errno(mc.server)));

2345

2527

if(debug){

2346

2528

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

2347

2529

}

2348

2349

ret = avahi_loop_with_timeout(mc.simple_poll,

2350

(int)(retry_interval * 1000));

2530

2531

ret = avahi_loop_with_timeout(simple_poll,

2532

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

2351

2533

if(debug){

2352

2534

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

2353

2535

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

2360

2542

}

2361

2543

2362

2544

/* Cleanup things */

2545

free(mc.interfaces);

2546

2363

2547

if(sb != NULL)

2364

2548

avahi_s_service_browser_free(sb);

2365

2549

2366

2550

if(mc.server != NULL)

2367

2551

avahi_server_free(mc.server);

2368

2552

2369

if(mc.simple_poll != NULL)

2370

avahi_simple_poll_free(mc.simple_poll);

2553

if(simple_poll != NULL)

2554

avahi_simple_poll_free(simple_poll);

2371

2555

2372

2556

if(gnutls_initialized){

2373

2557

gnutls_certificate_free_credentials(mc.cred);

2385

2569

mc.current_server->prev->next = NULL;

2386

2570

while(mc.current_server != NULL){

2387

2571

server *next = mc.current_server->next;

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic push

2574

#pragma GCC diagnostic ignored "-Wcast-qual"

2575

#endif

2576

free((char *)(mc.current_server->ip));

2577

#ifdef __GNUC__

2578

#pragma GCC diagnostic pop

2579

#endif

2388

2580

free(mc.current_server);

2389

2581

mc.current_server = next;

2390

2582

}

2391

2583

}

2392

2584

2393

/* Re-raise priviliges */

2585

/* Re-raise privileges */

2394

2586

{

2395

raise_privileges();

2396

2397

/* Run network hooks */

2398

run_network_hooks("stop", interfaces_hooks != NULL ?

2399

interfaces_hooks : "", delay);

2400

2401

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

2402

{

2403

char *interface = NULL;

2404

while((interface=argz_next(interfaces_to_take_down,

2405

interfaces_to_take_down_size,

2406

interface))){

2407

ret_errno = take_down_interface(interface);

2408

if(ret_errno != 0){

2409

errno = ret_errno;

2410

perror_plus("Failed to take down interface");

2411

}

2412

}

2413

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

2414

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

2415

" down\n");

2416

}

2417

}

2418

2419

lower_privileges_permanently();

2587

ret_errno = raise_privileges();

2588

if(ret_errno != 0){

2589

errno = ret_errno;

2590

perror_plus("Failed to raise privileges");

2591

} else {

2592

2593

/* Run network hooks */

2594

run_network_hooks("stop", interfaces_hooks != NULL ?

2595

interfaces_hooks : "", delay);

2596

2597

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

2598

{

2599

char *interface = NULL;

2600

while((interface=argz_next(interfaces_to_take_down,

2601

interfaces_to_take_down_size,

2602

interface))){

2603

ret_errno = take_down_interface(interface);

2604

if(ret_errno != 0){

2605

errno = ret_errno;

2606

perror_plus("Failed to take down interface");

2607

}

2608

}

2609

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

2610

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

2611

" down\n");

2612

}

2613

}

2614

}

2615

2616

ret_errno = lower_privileges_permanently();

2617

if(ret_errno != 0){

2618

errno = ret_errno;

2619

perror_plus("Failed to lower privileges permanently");

2620

}

2420

2621

}

2421

2622

2422

2623

free(interfaces_to_take_down);

2423

2624

free(interfaces_hooks);

2424

2625

2425

2626

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

2426

if(tempdir_created){

2627

if(tempdir != NULL){

2427

2628

struct dirent **direntries = NULL;

2428

struct dirent *direntry = NULL;

2429

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

2430

alphasort);

2431

if (numentries > 0){

2432

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

2433

direntry = direntries[i];

2434

char *fullname = NULL;

2435

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

2436

direntry->d_name);

2437

if(ret < 0){

2438

perror_plus("asprintf");

2439

continue;

2440

}

2441

ret = remove(fullname);

2442

if(ret == -1){

2443

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

2444

strerror(errno));

2445

}

2446

free(fullname);

2629

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

2630

O_NOFOLLOW));

2631

if(tempdir_fd == -1){

2632

perror_plus("open");

2633

} else {

2634

#ifdef __GLIBC__

2635

#if __GLIBC_PREREQ(2, 15)

2636

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

2637

notdotentries, alphasort);

2638

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

2639

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

2640

alphasort);

2641

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

2642

#else /* not __GLIBC__ */

2643

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

2644

alphasort);

2645

#endif /* not __GLIBC__ */

2646

if(numentries >= 0){

2647

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

2648

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

2649

if(ret == -1){

2650

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

2651

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

2652

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

2653

}

2654

free(direntries[i]);

2655

}

2656

2657

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

2658

free(direntries);

2659

if(numentries == -1){

2660

perror_plus("scandir");

2661

}

2662

ret = rmdir(tempdir);

2663

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

2664

perror_plus("rmdir");

2665

}

2447

2666

}

2448

}

2449

2450

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

2451

free(direntries);

2452

if (numentries == -1){

2453

perror_plus("scandir");

2454

}

2455

ret = rmdir(tempdir);

2456

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

2457

perror_plus("rmdir");

2667

TEMP_FAILURE_RETRY(close(tempdir_fd));

2458

2668

}

2459

2669

}

2460

2670