/mandos/release : revision 237.7.241

9

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

10

*

11

* Everything else is

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12

13

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*

15

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

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

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

41

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect() */

58

inet_pton(), connect(),

59

getnameinfo() */

59

60

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

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61

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

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62

*/

73

74

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

74

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

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

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

77

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

77

78

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

78

79

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

79

80

argp_state, struct argp,

91

92

argz_delete(), argz_append(),

92

93

argz_stringify(), argz_add(),

93

94

argz_count() */

95

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

96

EAI_SYSTEM, gai_strerror() */

94

97

95

98

#ifdef __linux__

96

99

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

138

141

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

139

142

char *connect_to = NULL;

140

143

const char *hookdir = HOOKDIR;

144

int hookdir_fd = -1;

141

145

uid_t uid = 65534;

142

146

gid_t gid = 65534;

143

147

154

158

155

159

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

156

160

typedef struct {

157

AvahiSimplePoll *simple_poll;

158

161

AvahiServer *server;

159

162

gnutls_certificate_credentials_t cred;

160

163

unsigned int dh_bits;

162

165

const char *priority;

163

166

gpgme_ctx_t ctx;

164

167

server *current_server;

168

char *interfaces;

169

size_t interfaces_size;

165

170

} mandos_context;

166

171

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 };

172

/* global so signal handler can reach it*/

173

AvahiSimplePoll *simple_poll;

172

174

173

175

sig_atomic_t quit_now = 0;

174

176

int signal_received = 0;

182

184

perror(print_text);

183

185

}

184

186

185

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

187

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

186

188

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

187

189

va_list ap;

188

190

va_start (ap, format);

189

191

190

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

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193

program_invocation_short_name));

192

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

194

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

193

195

}

194

196

195

197

/*

197

199

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

198

200

* "buffer_length" is how much is already used.

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201

*/

202

__attribute__((nonnull, warn_unused_result))

200

203

size_t incbuffer(char **buffer, size_t buffer_length,

201

204

size_t buffer_capacity){

202

205

if(buffer_length + BUFFER_SIZE > buffer_capacity){

203

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

204

if(buffer == NULL){

206

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

207

if(new_buf == NULL){

208

int old_errno = errno;

209

free(*buffer);

210

errno = old_errno;

211

*buffer = NULL;

205

212

return 0;

206

213

}

214

*buffer = new_buf;

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215

buffer_capacity += BUFFER_SIZE;

208

216

}

209

217

return buffer_capacity;

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218

}

211

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212

220

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

221

__attribute__((nonnull, warn_unused_result))

213

222

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

214

int af){

223

int af, server **current_server){

215

224

int ret;

216

225

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

217

226

if(new_server == NULL){

226

235

perror_plus("strdup");

227

236

return false;

228

237

}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

242

}

229

243

/* Special case of first server */

230

if (mc.current_server == NULL){

244

if(*current_server == NULL){

231

245

new_server->next = new_server;

232

246

new_server->prev = new_server;

233

mc.current_server = new_server;

234

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

247

*current_server = new_server;

235

248

} else {

236

new_server->next = mc.current_server;

237

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

249

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

250

new_server->next = *current_server;

251

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

238

252

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;

253

(*current_server)->prev = new_server;

245

254

}

246

255

return true;

247

256

}

249

258

/*

250

259

* Initialize GPGME.

251

260

*/

252

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

253

const char *tempdir){

261

__attribute__((nonnull, warn_unused_result))

262

static bool init_gpgme(const char * const seckey,

263

const char * const pubkey,

264

const char * const tempdir,

265

mandos_context *mc){

254

266

gpgme_error_t rc;

255

267

gpgme_engine_info_t engine_info;

256

268

257

258

269

/*

259

270

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

260

271

*/

261

bool import_key(const char *filename){

272

bool import_key(const char * const filename){

262

273

int ret;

263

274

int fd;

264

275

gpgme_data_t pgp_data;

276

287

return false;

277

288

}

278

289

279

rc = gpgme_op_import(mc.ctx, pgp_data);

290

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

280

291

if(rc != GPG_ERR_NO_ERROR){

281

292

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

282

293

gpgme_strsource(rc), gpgme_strerror(rc));

326

337

}

327

338

328

339

/* Create new GPGME "context" */

329

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

340

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

330

341

if(rc != GPG_ERR_NO_ERROR){

331

342

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

332

343

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

345

356

* Decrypt OpenPGP data.

346

357

* Returns -1 on error

347

358

*/

359

__attribute__((nonnull, warn_unused_result))

348

360

static ssize_t pgp_packet_decrypt(const char *cryptotext,

349

361

size_t crypto_size,

350

char **plaintext){

362

char **plaintext,

363

mandos_context *mc){

351

364

gpgme_data_t dh_crypto, dh_plain;

352

365

gpgme_error_t rc;

353

366

ssize_t ret;

379

392

380

393

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

381

394

data buffer */

382

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

395

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

383

396

if(rc != GPG_ERR_NO_ERROR){

384

397

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

385

398

gpgme_strsource(rc), gpgme_strerror(rc));

386

399

plaintext_length = -1;

387

400

if(debug){

388

401

gpgme_decrypt_result_t result;

389

result = gpgme_op_decrypt_result(mc.ctx);

402

result = gpgme_op_decrypt_result(mc->ctx);

390

403

if(result == NULL){

391

404

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

392

405

} else {

469

482

return plaintext_length;

470

483

}

471

484

472

static const char * safer_gnutls_strerror(int value){

485

__attribute__((warn_unused_result))

486

static const char *safer_gnutls_strerror(int value){

473

487

const char *ret = gnutls_strerror(value);

474

488

if(ret == NULL)

475

489

ret = "(unknown)";

477

491

}

478

492

479

493

/* GnuTLS log function callback */

494

__attribute__((nonnull))

480

495

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

481

496

const char* string){

482

497

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

483

498

}

484

499

500

__attribute__((nonnull, warn_unused_result))

485

501

static int init_gnutls_global(const char *pubkeyfilename,

486

const char *seckeyfilename){

502

const char *seckeyfilename,

503

mandos_context *mc){

487

504

int ret;

488

505

489

506

if(debug){

506

523

}

507

524

508

525

/* OpenPGP credentials */

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

526

ret = gnutls_certificate_allocate_credentials(&mc->cred);

510

527

if(ret != GNUTLS_E_SUCCESS){

511

528

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

512

529

safer_gnutls_strerror(ret));

522

539

}

523

540

524

541

ret = gnutls_certificate_set_openpgp_key_file

525

(mc.cred, pubkeyfilename, seckeyfilename,

542

(mc->cred, pubkeyfilename, seckeyfilename,

526

543

GNUTLS_OPENPGP_FMT_BASE64);

527

544

if(ret != GNUTLS_E_SUCCESS){

528

545

fprintf_plus(stderr,

534

551

}

535

552

536

553

/* GnuTLS server initialization */

537

ret = gnutls_dh_params_init(&mc.dh_params);

554

ret = gnutls_dh_params_init(&mc->dh_params);

538

555

if(ret != GNUTLS_E_SUCCESS){

539

556

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

540

557

" initialization: %s\n",

541

558

safer_gnutls_strerror(ret));

542

559

goto globalfail;

543

560

}

544

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

561

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

545

562

if(ret != GNUTLS_E_SUCCESS){

546

563

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

547

564

safer_gnutls_strerror(ret));

548

565

goto globalfail;

549

566

}

550

567

551

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

568

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

552

569

553

570

return 0;

554

571

555

572

globalfail:

556

573

557

gnutls_certificate_free_credentials(mc.cred);

574

gnutls_certificate_free_credentials(mc->cred);

558

575

gnutls_global_deinit();

559

gnutls_dh_params_deinit(mc.dh_params);

576

gnutls_dh_params_deinit(mc->dh_params);

560

577

return -1;

561

578

}

562

579

563

static int init_gnutls_session(gnutls_session_t *session){

580

__attribute__((nonnull, warn_unused_result))

581

static int init_gnutls_session(gnutls_session_t *session,

582

mandos_context *mc){

564

583

int ret;

565

584

/* GnuTLS session creation */

566

585

do {

578

597

{

579

598

const char *err;

580

599

do {

581

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

600

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

582

601

if(quit_now){

583

602

gnutls_deinit(*session);

584

603

return -1;

595

614

596

615

do {

597

616

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc.cred);

617

mc->cred);

599

618

if(quit_now){

600

619

gnutls_deinit(*session);

601

620

return -1;

611

630

/* ignore client certificate if any. */

612

631

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

632

614

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

633

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

634

616

635

return 0;

617

636

}

621

640

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

622

641

623

642

/* Called when a Mandos server is found */

643

__attribute__((nonnull, warn_unused_result))

624

644

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

625

645

AvahiIfIndex if_index,

626

int af){

646

int af, mandos_context *mc){

627

647

int ret, tcp_sd = -1;

628

648

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

649

struct sockaddr_storage to;

633

650

char *buffer = NULL;

634

651

char *decrypted_buffer = NULL;

635

652

size_t buffer_length = 0;

659

676

return -1;

660

677

}

661

678

662

ret = init_gnutls_session(&session);

679

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

680

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

681

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

682

bool match = false;

683

{

684

char *interface = NULL;

685

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

686

interface))){

687

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

688

match = true;

689

break;

690

}

691

}

692

}

693

if(not match){

694

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

695

connect to the server */

696

if(debug){

697

char interface[IF_NAMESIZE];

698

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

699

perror_plus("if_indextoname");

700

} else {

701

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

702

" \"%s\"\n",

703

if_indextoname((unsigned int)if_index,

704

interface));

705

}

706

}

707

return -1;

708

}

709

}

710

711

ret = init_gnutls_session(&session, mc);

663

712

if(ret != 0){

664

713

return -1;

665

714

}

684

733

685

734

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

686

735

if(af == AF_INET6){

687

to.in6.sin6_family = (sa_family_t)af;

688

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

736

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

737

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

689

738

} else { /* IPv4 */

690

to.in.sin_family = (sa_family_t)af;

691

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

739

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

740

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

692

741

}

693

742

if(ret < 0 ){

694

743

int e = errno;

703

752

goto mandos_end;

704

753

}

705

754

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*/

755

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

756

if(IN6_IS_ADDR_LINKLOCAL

757

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

710

758

if(if_index == AVAHI_IF_UNSPEC){

711

759

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

712

760

" incomplete without a network interface\n");

714

762

goto mandos_end;

715

763

}

716

764

/* Set the network interface number as scope */

717

to.in6.sin6_scope_id = (uint32_t)if_index;

765

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

718

766

}

719

767

} else {

720

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

721

-Wconversion and

722

-Wunreachable-code */

768

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

723

769

}

724

770

725

771

if(quit_now){

742

788

}

743

789

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

744

790

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

745

const char *pcret;

746

791

if(af == AF_INET6){

747

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

748

sizeof(addrstr));

792

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

793

sizeof(struct sockaddr_in6),

794

addrstr, sizeof(addrstr), NULL, 0,

795

NI_NUMERICHOST);

749

796

} else {

750

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

751

sizeof(addrstr));

797

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

798

sizeof(struct sockaddr_in),

799

addrstr, sizeof(addrstr), NULL, 0,

800

NI_NUMERICHOST);

752

801

}

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

}

802

if(ret == EAI_SYSTEM){

803

perror_plus("getnameinfo");

804

} else if(ret != 0) {

805

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

806

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

807

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

759

808

}

760

809

}

761

810

765

814

}

766

815

767

816

if(af == AF_INET6){

768

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

817

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

818

sizeof(struct sockaddr_in6));

769

819

} else {

770

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

820

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

821

sizeof(struct sockaddr_in));

771

822

}

772

823

if(ret < 0){

773

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

824

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

774

825

int e = errno;

775

826

perror_plus("connect");

776

827

errno = e;

937

988

if(buffer_length > 0){

938

989

ssize_t decrypted_buffer_size;

939

990

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

940

&decrypted_buffer);

991

&decrypted_buffer, mc);

941

992

if(decrypted_buffer_size >= 0){

942

993

943

994

written = 0;

991

1042

return retval;

992

1043

}

993

1044

1045

__attribute__((nonnull))

994

1046

static void resolve_callback(AvahiSServiceResolver *r,

995

1047

AvahiIfIndex interface,

996

1048

AvahiProtocol proto,

1004

1056

AVAHI_GCC_UNUSED AvahiStringList *txt,

1005

1057

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

1058

flags,

1007

AVAHI_GCC_UNUSED void* userdata){

1059

void *mc){

1008

1060

if(r == NULL){

1009

1061

return;

1010

1062

}

1022

1074

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

1023

1075

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

1024

1076

domain,

1025

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_strerror(avahi_server_errno

1078

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

1026

1079

break;

1027

1080

1028

1081

case AVAHI_RESOLVER_FOUND:

1036

1089

}

1037

1090

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

1038

1091

interface,

1039

avahi_proto_to_af(proto));

1092

avahi_proto_to_af(proto),

1093

mc);

1040

1094

if(ret == 0){

1041

avahi_simple_poll_quit(mc.simple_poll);

1095

avahi_simple_poll_quit(simple_poll);

1042

1096

} else {

1043

1097

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

1044

avahi_proto_to_af(proto))){

1098

avahi_proto_to_af(proto),

1099

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

1045

1100

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

1046

1101

" list\n", name);

1047

1102

}

1060

1115

const char *domain,

1061

1116

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

1117

flags,

1063

AVAHI_GCC_UNUSED void* userdata){

1118

void *mc){

1064

1119

if(b == NULL){

1065

1120

return;

1066

1121

}

1077

1132

case AVAHI_BROWSER_FAILURE:

1078

1133

1079

1134

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1135

avahi_strerror(avahi_server_errno

1136

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

1137

avahi_simple_poll_quit(simple_poll);

1082

1138

return;

1083

1139

1084

1140

case AVAHI_BROWSER_NEW:

1087

1143

the callback function is called the Avahi server will free the

1088

1144

resolver for us. */

1089

1145

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1146

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

1147

interface, protocol, name, type,

1148

domain, protocol, 0,

1149

resolve_callback, mc) == NULL)

1093

1150

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

1094

1151

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1152

avahi_strerror(avahi_server_errno

1153

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

1096

1154

break;

1097

1155

1098

1156

case AVAHI_BROWSER_REMOVE:

1117

1175

signal_received = sig;

1118

1176

int old_errno = errno;

1119

1177

/* set main loop to exit */

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1178

if(simple_poll != NULL){

1179

avahi_simple_poll_quit(simple_poll);

1122

1180

}

1123

1181

errno = old_errno;

1124

1182

}

1125

1183

1184

__attribute__((nonnull, warn_unused_result))

1126

1185

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

1127

1186

int ret;

1128

1187

error_t ret_errno;

1147

1206

return true;

1148

1207

}

1149

1208

1209

__attribute__((nonnull, warn_unused_result))

1150

1210

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

1151

1211

1152

1212

/* Reject the loopback device */

1194

1254

* corresponds to an acceptable network device.

1195

1255

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

1196

1256

*/

1257

__attribute__((nonnull, warn_unused_result))

1197

1258

int good_interface(const struct dirent *if_entry){

1198

1259

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

1199

1260

return 0;

1217

1278

/*

1218

1279

* This function determines if a network interface is up.

1219

1280

*/

1281

__attribute__((nonnull, warn_unused_result))

1220

1282

bool interface_is_up(const char *interface){

1221

1283

struct ifreq ifr;

1222

1284

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

1233

1295

/*

1234

1296

* This function determines if a network interface is running

1235

1297

*/

1298

__attribute__((nonnull, warn_unused_result))

1236

1299

bool interface_is_running(const char *interface){

1237

1300

struct ifreq ifr;

1238

1301

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

1246

1309

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

1247

1310

}

1248

1311

1312

__attribute__((nonnull, pure, warn_unused_result))

1249

1313

int notdotentries(const struct dirent *direntry){

1250

1314

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

1251

1315

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

1258

1322

}

1259

1323

1260

1324

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

1325

__attribute__((nonnull, warn_unused_result))

1261

1326

int runnable_hook(const struct dirent *direntry){

1262

1327

int ret;

1263

1328

size_t sret;

1271

1336

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

1272

1337

"abcdefghijklmnopqrstuvwxyz"

1273

1338

"0123456789"

1274

"_-");

1339

"_.-");

1275

1340

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

1276

1341

/* Contains non-allowed characters */

1277

1342

if(debug){

1281

1346

return 0;

1282

1347

}

1283

1348

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);

1349

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

1292

1350

if(ret == -1){

1293

1351

if(debug){

1294

1352

perror_plus("Could not stat hook");

1318

1376

return 1;

1319

1377

}

1320

1378

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1379

__attribute__((nonnull, warn_unused_result))

1380

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1381

mandos_context *mc){

1322

1382

int ret;

1323

1383

struct timespec now;

1324

1384

struct timespec waited_time;

1325

1385

intmax_t block_time;

1326

1386

1327

1387

while(true){

1328

if(mc.current_server == NULL){

1329

if (debug){

1388

if(mc->current_server == NULL){

1389

if(debug){

1330

1390

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

1331

1391

" No timeout!\n");

1332

1392

}

1333

1393

ret = avahi_simple_poll_iterate(s, -1);

1334

1394

} else {

1335

if (debug){

1395

if(debug){

1336

1396

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

1337

1397

" it, or wait\n");

1338

1398

}

1345

1405

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

1346

1406

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

1347

1407

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1408

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

1349

1409

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1410

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

1351

1411

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

1352

1412

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

1353

1413

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

1355

1415

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

1356

1416

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

1357

1417

1358

if (debug){

1418

if(debug){

1359

1419

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

1360

1420

block_time);

1361

1421

}

1362

1422

1363

1423

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);

1424

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

1425

mc->current_server->port,

1426

mc->current_server->if_index,

1427

mc->current_server->af, mc);

1368

1428

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1429

avahi_simple_poll_quit(s);

1370

1430

return 0;

1371

1431

}

1372

1432

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1433

&mc->current_server->last_seen);

1374

1434

if(ret == -1){

1375

1435

perror_plus("clock_gettime");

1376

1436

return -1;

1377

1437

}

1378

mc.current_server = mc.current_server->next;

1438

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

1379

1439

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

1380

1440

servers, but don't block */

1381

1441

}

1383

1443

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

1384

1444

}

1385

1445

if(ret != 0){

1386

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

1446

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

1387

1447

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

1388

1448

}

1389

1449

}

1391

1451

}

1392

1452

1393

1453

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

1454

__attribute__((warn_unused_result))

1394

1455

error_t raise_privileges(void){

1395

1456

error_t old_errno = errno;

1396

1457

error_t ret_errno = 0;

1403

1464

}

1404

1465

1405

1466

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

1467

__attribute__((warn_unused_result))

1406

1468

error_t raise_privileges_permanently(void){

1407

1469

error_t old_errno = errno;

1408

1470

error_t ret_errno = raise_privileges();

1419

1481

}

1420

1482

1421

1483

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

1484

__attribute__((warn_unused_result))

1422

1485

error_t lower_privileges(void){

1423

1486

error_t old_errno = errno;

1424

1487

error_t ret_errno = 0;

1431

1494

}

1432

1495

1433

1496

/* Lower privileges permanently */

1497

__attribute__((warn_unused_result))

1434

1498

error_t lower_privileges_permanently(void){

1435

1499

error_t old_errno = errno;

1436

1500

error_t ret_errno = 0;

1442

1506

return ret_errno;

1443

1507

}

1444

1508

1445

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

1509

#ifndef O_CLOEXEC

1510

/*

1511

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

1512

* Descriptor Flags".

1513

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

1514

*/

1515

__attribute__((warn_unused_result))

1516

static int set_cloexec_flag(int fd){

1517

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

1518

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

1519

if(ret < 0){

1520

return ret;

1521

}

1522

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

1523

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

1524

ret | FD_CLOEXEC));

1525

}

1526

#endif /* not O_CLOEXEC */

1527

1528

__attribute__((nonnull))

1529

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

1446

1530

const float delay){

1447

1531

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

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

1451

alphasort);

1532

if(hookdir_fd == -1){

1533

hookdir_fd = open(hookdir, O_RDONLY |

1534

#ifdef O_CLOEXEC

1535

O_CLOEXEC

1536

#else /* not O_CLOEXEC */

1537

0

1538

#endif /* not O_CLOEXEC */

1539

);

1540

if(hookdir_fd == -1){

1541

if(errno == ENOENT){

1542

if(debug){

1543

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

1544

" found\n", hookdir);

1545

}

1546

} else {

1547

perror_plus("open");

1548

}

1549

return;

1550

}

1551

#ifndef O_CLOEXEC

1552

if(set_cloexec_flag(hookdir_fd) < 0){

1553

perror_plus("set_cloexec_flag");

1554

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

1555

perror_plus("close");

1556

} else {

1557

hookdir_fd = -1;

1558

}

1559

return;

1560

}

1561

#endif /* not O_CLOEXEC */

1562

}

1563

#ifdef __GLIBC__

1564

#if __GLIBC_PREREQ(2, 15)

1565

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

1566

runnable_hook, alphasort);

1567

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

1568

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

1569

alphasort);

1570

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

1571

#else /* not __GLIBC__ */

1572

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

1573

alphasort);

1574

#endif /* not __GLIBC__ */

1452

1575

if(numhooks == -1){

1453

1576

perror_plus("scandir");

1454

} else {

1455

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

1456

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

1457

direntry = direntries[i];

1458

char *fullname = NULL;

1459

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

1460

if(ret < 0){

1577

return;

1578

}

1579

struct dirent *direntry;

1580

int ret;

1581

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

1582

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

1583

direntry = direntries[i];

1584

if(debug){

1585

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

1586

direntry->d_name);

1587

}

1588

pid_t hook_pid = fork();

1589

if(hook_pid == 0){

1590

/* Child */

1591

/* Raise privileges */

1592

if(raise_privileges_permanently() != 0){

1593

perror_plus("Failed to raise privileges");

1594

_exit(EX_NOPERM);

1595

}

1596

/* Set group */

1597

errno = 0;

1598

ret = setgid(0);

1599

if(ret == -1){

1600

perror_plus("setgid");

1601

_exit(EX_NOPERM);

1602

}

1603

/* Reset supplementary groups */

1604

errno = 0;

1605

ret = setgroups(0, NULL);

1606

if(ret == -1){

1607

perror_plus("setgroups");

1608

_exit(EX_NOPERM);

1609

}

1610

ret = dup2(devnull, STDIN_FILENO);

1611

if(ret == -1){

1612

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

1613

_exit(EX_OSERR);

1614

}

1615

ret = close(devnull);

1616

if(ret == -1){

1617

perror_plus("close");

1618

_exit(EX_OSERR);

1619

}

1620

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1621

if(ret == -1){

1622

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

1623

_exit(EX_OSERR);

1624

}

1625

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

1626

if(ret == -1){

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

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

1631

if(ret == -1){

1632

perror_plus("setenv");

1633

_exit(EX_OSERR);

1634

}

1635

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

1636

if(ret == -1){

1637

perror_plus("setenv");

1638

_exit(EX_OSERR);

1639

}

1640

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

1641

if(ret == -1){

1642

perror_plus("setenv");

1643

_exit(EX_OSERR);

1644

}

1645

char *delaystring;

1646

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

1647

if(ret == -1){

1461

1648

perror_plus("asprintf");

1462

continue;

1463

}

1464

if(debug){

1465

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

1466

direntry->d_name);

1467

}

1468

pid_t hook_pid = fork();

1469

if(hook_pid == 0){

1470

/* Child */

1471

/* Raise privileges */

1472

raise_privileges_permanently();

1473

/* Set group */

1474

errno = 0;

1475

ret = setgid(0);

1476

if(ret == -1){

1477

perror_plus("setgid");

1478

}

1479

/* Reset supplementary groups */

1480

errno = 0;

1481

ret = setgroups(0, NULL);

1482

if(ret == -1){

1483

perror_plus("setgroups");

1484

}

1485

dup2(devnull, STDIN_FILENO);

1486

close(devnull);

1487

dup2(STDERR_FILENO, STDOUT_FILENO);

1488

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

1489

if(ret == -1){

1490

perror_plus("setenv");

1491

_exit(EX_OSERR);

1492

}

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

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

1499

if(ret == -1){

1500

perror_plus("setenv");

1501

_exit(EX_OSERR);

1502

}

1503

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

1504

if(ret == -1){

1505

perror_plus("setenv");

1506

_exit(EX_OSERR);

1507

}

1508

char *delaystring;

1509

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

1510

if(ret == -1){

1511

perror_plus("asprintf");

1512

_exit(EX_OSERR);

1513

}

1514

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

1515

if(ret == -1){

1516

free(delaystring);

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1649

_exit(EX_OSERR);

1650

}

1651

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

1652

if(ret == -1){

1520

1653

free(delaystring);

1521

if(connect_to != NULL){

1522

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

1523

if(ret == -1){

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

1527

}

1528

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

1529

perror_plus("execl");

1530

_exit(EXIT_FAILURE);

1531

}

1654

perror_plus("setenv");

1655

_exit(EX_OSERR);

1656

}

1657

free(delaystring);

1658

if(connect_to != NULL){

1659

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

1660

if(ret == -1){

1661

perror_plus("setenv");

1662

_exit(EX_OSERR);

1663

}

1664

}

1665

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

1666

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

1667

perror_plus("fexecve");

1668

_exit(EXIT_FAILURE);

1669

}

1670

} else {

1671

int status;

1672

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

1673

perror_plus("waitpid");

1674

continue;

1675

}

1676

if(WIFEXITED(status)){

1677

if(WEXITSTATUS(status) != 0){

1678

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

1679

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

1680

WEXITSTATUS(status));

1681

continue;

1682

}

1683

} else if(WIFSIGNALED(status)){

1684

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

1685

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

1686

WTERMSIG(status));

1687

continue;

1532

1688

} else {

1533

int status;

1534

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

1535

perror_plus("waitpid");

1536

free(fullname);

1537

continue;

1538

}

1539

if(WIFEXITED(status)){

1540

if(WEXITSTATUS(status) != 0){

1541

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

1542

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

1543

WEXITSTATUS(status));

1544

free(fullname);

1545

continue;

1546

}

1547

} else if(WIFSIGNALED(status)){

1548

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

1549

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

1550

WTERMSIG(status));

1551

free(fullname);

1552

continue;

1553

} else {

1554

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

1555

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

1556

free(fullname);

1557

continue;

1558

}

1559

}

1560

free(fullname);

1561

if(debug){

1562

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

1563

direntry->d_name);

1564

}

1565

}

1566

close(devnull);

1567

}

1568

return true;

1689

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

1690

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

1691

continue;

1692

}

1693

}

1694

if(debug){

1695

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

1696

direntry->d_name);

1697

}

1698

}

1699

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

1700

perror_plus("close");

1701

} else {

1702

hookdir_fd = -1;

1703

}

1704

close(devnull);

1569

1705

}

1570

1706

1707

__attribute__((nonnull, warn_unused_result))

1571

1708

error_t bring_up_interface(const char *const interface,

1572

1709

const float delay){

1573

int sd = -1;

1574

1710

error_t old_errno = errno;

1575

error_t ret_errno = 0;

1576

int ret, ret_setflags;

1711

int ret;

1577

1712

struct ifreq network;

1578

1713

unsigned int if_index = if_nametoindex(interface);

1579

1714

if(if_index == 0){

1588

1723

}

1589

1724

1590

1725

if(not interface_is_up(interface)){

1591

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

1726

error_t ret_errno = 0, ioctl_errno = 0;

1727

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

1592

1728

ret_errno = errno;

1593

1729

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

1594

1730

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

1731

errno = old_errno;

1595

1732

return ret_errno;

1596

1733

}

1597

network.ifr_flags |= IFF_UP;

1734

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

1598

1735

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

1736

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

1737

if(sd == -1){

1601

1738

ret_errno = errno;

1602

1739

perror_plus("socket");

1603

1740

errno = old_errno;

1604

1741

return ret_errno;

1605

1742

}

1606

1743

1607

1744

if(quit_now){

1608

close(sd);

1745

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

1746

if(ret == -1){

1747

perror_plus("close");

1748

}

1609

1749

errno = old_errno;

1610

1750

return EINTR;

1611

1751

}

1615

1755

interface);

1616

1756

}

1617

1757

1618

/* Raise priviliges */

1619

raise_privileges();

1758

/* Raise privileges */

1759

ret_errno = raise_privileges();

1760

if(ret_errno != 0){

1761

perror_plus("Failed to raise privileges");

1762

}

1620

1763

1621

1764

#ifdef __linux__

1622

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1623

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

1624

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

1625

bool restore_loglevel = true;

1626

if(ret_linux == -1){

1627

restore_loglevel = false;

1628

perror_plus("klogctl");

1765

int ret_linux;

1766

bool restore_loglevel = false;

1767

if(ret_errno == 0){

1768

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1769

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

1770

ret_linux = klogctl(8, NULL, 5);

1771

if(ret_linux == -1){

1772

perror_plus("klogctl");

1773

} else {

1774

restore_loglevel = true;

1775

}

1629

1776

}

1630

1777

#endif /* __linux__ */

1631

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

1632

ret_errno = errno;

1778

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

1779

ioctl_errno = errno;

1633

1780

#ifdef __linux__

1634

1781

if(restore_loglevel){

1635

1782

ret_linux = klogctl(7, NULL, 0);

1639

1786

}

1640

1787

#endif /* __linux__ */

1641

1788

1642

/* Lower privileges */

1643

lower_privileges();

1789

/* If raise_privileges() succeeded above */

1790

if(ret_errno == 0){

1791

/* Lower privileges */

1792

ret_errno = lower_privileges();

1793

if(ret_errno != 0){

1794

errno = ret_errno;

1795

perror_plus("Failed to lower privileges");

1796

}

1797

}

1644

1798

1645

1799

/* Close the socket */

1646

1800

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

1649

1803

}

1650

1804

1651

1805

if(ret_setflags == -1){

1652

errno = ret_errno;

1806

errno = ioctl_errno;

1653

1807

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1654

1808

errno = old_errno;

1655

return ret_errno;

1809

return ioctl_errno;

1656

1810

}

1657

1811

} else if(debug){

1658

1812

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

1676

1830

return 0;

1677

1831

}

1678

1832

1833

__attribute__((nonnull, warn_unused_result))

1679

1834

error_t take_down_interface(const char *const interface){

1680

int sd = -1;

1681

1835

error_t old_errno = errno;

1682

error_t ret_errno = 0;

1683

int ret, ret_setflags;

1684

1836

struct ifreq network;

1685

1837

unsigned int if_index = if_nametoindex(interface);

1686

1838

if(if_index == 0){

1689

1841

return ENXIO;

1690

1842

}

1691

1843

if(interface_is_up(interface)){

1844

error_t ret_errno = 0, ioctl_errno = 0;

1692

1845

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

1693

1846

ret_errno = errno;

1694

1847

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

1695

1848

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

1849

errno = old_errno;

1696

1850

return ret_errno;

1697

1851

}

1698

1852

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

1699

1853

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

1854

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

1855

if(sd == -1){

1702

1856

ret_errno = errno;

1703

1857

perror_plus("socket");

1704

1858

errno = old_errno;

1710

1864

interface);

1711

1865

}

1712

1866

1713

/* Raise priviliges */

1714

raise_privileges();

1715

1716

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

1717

ret_errno = errno;

1718

1719

/* Lower privileges */

1720

lower_privileges();

1867

/* Raise privileges */

1868

ret_errno = raise_privileges();

1869

if(ret_errno != 0){

1870

perror_plus("Failed to raise privileges");

1871

}

1872

1873

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

1874

ioctl_errno = errno;

1875

1876

/* If raise_privileges() succeeded above */

1877

if(ret_errno == 0){

1878

/* Lower privileges */

1879

ret_errno = lower_privileges();

1880

if(ret_errno != 0){

1881

errno = ret_errno;

1882

perror_plus("Failed to lower privileges");

1883

}

1884

}

1721

1885

1722

1886

/* Close the socket */

1723

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

1887

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

1724

1888

if(ret == -1){

1725

1889

perror_plus("close");

1726

1890

}

1727

1891

1728

1892

if(ret_setflags == -1){

1729

errno = ret_errno;

1893

errno = ioctl_errno;

1730

1894

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1731

1895

errno = old_errno;

1732

return ret_errno;

1896

return ioctl_errno;

1733

1897

}

1734

1898

} else if(debug){

1735

1899

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

1741

1905

}

1742

1906

1743

1907

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

1908

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

1909

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

1910

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

1911

.interfaces = NULL, .interfaces_size = 0 };

1744

1912

AvahiSServiceBrowser *sb = NULL;

1745

1913

error_t ret_errno;

1746

1914

int ret;

1747

1915

intmax_t tmpmax;

1748

1916

char *tmp;

1749

1917

int exitcode = EXIT_SUCCESS;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

1752

1918

char *interfaces_to_take_down = NULL;

1753

1919

size_t interfaces_to_take_down_size = 0;

1754

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

1755

bool tempdir_created = false;

1920

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

1921

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

1922

char *tempdir = NULL;

1756

1923

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1757

1924

const char *seckey = PATHDIR "/" SECKEY;

1758

1925

const char *pubkey = PATHDIR "/" PUBKEY;

1759

1926

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

1761

1927

1762

1928

bool gnutls_initialized = false;

1763

1929

bool gpgme_initialized = false;

1854

2020

connect_to = arg;

1855

2021

break;

1856

2022

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

1857

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

1858

(int)',');

2023

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

2024

arg, (int)',');

1859

2025

if(ret_errno != 0){

1860

2026

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

1861

2027

}

1941

2107

/* Work around Debian bug #633582:

1942

2108

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

1943

2109

1944

/* Re-raise priviliges */

1945

if(raise_privileges() == 0){

2110

/* Re-raise privileges */

2111

ret_errno = raise_privileges();

2112

if(ret_errno != 0){

2113

errno = ret_errno;

2114

perror_plus("Failed to raise privileges");

2115

} else {

1946

2116

struct stat st;

1947

2117

1948

2118

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

1988

2158

}

1989

2159

1990

2160

/* Lower privileges */

1991

errno = 0;

1992

ret = seteuid(uid);

1993

if(ret == -1){

1994

perror_plus("seteuid");

2161

ret_errno = lower_privileges();

2162

if(ret_errno != 0){

2163

errno = ret_errno;

2164

perror_plus("Failed to lower privileges");

1995

2165

}

1996

2166

}

1997

2167

}

1998

2168

1999

/* Remove empty interface names */

2169

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

2000

2170

{

2001

2171

char *interface = NULL;

2002

while((interface = argz_next(interfaces, interfaces_size,

2172

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

2003

2173

interface))){

2004

if(if_nametoindex(interface) == 0){

2005

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

2174

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

2175

and if_nametoindex(interface) == 0){

2176

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

2006

2177

fprintf_plus(stderr, "Not using nonexisting interface"

2007

2178

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

2008

2179

}

2009

argz_delete(&interfaces, &interfaces_size, interface);

2180

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

2010

2181

interface = NULL;

2011

2182

}

2012

2183

}

2014

2185

2015

2186

/* Run network hooks */

2016

2187

{

2017

ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,

2018

interfaces, interfaces_size);

2019

if(ret_errno != 0){

2020

errno = ret_errno;

2021

perror_plus("argz_append");

2022

goto end;

2023

}

2024

argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');

2025

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

2026

goto end;

2027

}

2188

if(mc.interfaces != NULL){

2189

interfaces_hooks = malloc(mc.interfaces_size);

2190

if(interfaces_hooks == NULL){

2191

perror_plus("malloc");

2192

goto end;

2193

}

2194

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

2195

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

2196

}

2197

run_network_hooks("start", interfaces_hooks != NULL ?

2198

interfaces_hooks : "", delay);

2028

2199

}

2029

2200

2030

2201

if(not debug){

2035

2206

from the signal handler */

2036

2207

/* Initialize the pseudo-RNG for Avahi */

2037

2208

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

2038

mc.simple_poll = avahi_simple_poll_new();

2039

if(mc.simple_poll == NULL){

2209

simple_poll = avahi_simple_poll_new();

2210

if(simple_poll == NULL){

2040

2211

fprintf_plus(stderr,

2041

2212

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

2042

2213

exitcode = EX_UNAVAILABLE;

2107

2278

}

2108

2279

2109

2280

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

2110

if(interfaces == NULL){

2281

if(mc.interfaces == NULL){

2111

2282

struct dirent **direntries;

2112

2283

/* Look for any good interfaces */

2113

2284

ret = scandir(sys_class_net, &direntries, good_interface,

2115

2286

if(ret >= 1){

2116

2287

/* Add all found interfaces to interfaces list */

2117

2288

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

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2289

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

2119

2290

direntries[i]->d_name);

2120

2291

if(ret_errno != 0){

2292

errno = ret_errno;

2121

2293

perror_plus("argz_add");

2122

2294

continue;

2123

2295

}

2135

2307

}

2136

2308

}

2137

2309

2138

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

2139

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

2140

if(debug){

2141

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

2142

interfaces);

2143

}

2144

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2145

}

2146

2147

/* Bring up interfaces which are down */

2148

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

2149

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

2310

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

2311

{

2150

2312

char *interface = NULL;

2151

while((interface = argz_next(interfaces, interfaces_size,

2313

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

2152

2314

interface))){

2315

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

2316

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

2317

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

2318

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

2319

interface);

2320

interface = NULL;

2321

while((interface = argz_next(mc.interfaces,

2322

mc.interfaces_size, interface))){

2323

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

2324

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

2325

interface);

2326

interface = NULL;

2327

}

2328

}

2329

break;

2330

}

2153

2331

bool interface_was_up = interface_is_up(interface);

2154

ret = bring_up_interface(interface, delay);

2332

errno = bring_up_interface(interface, delay);

2155

2333

if(not interface_was_up){

2156

if(ret != 0){

2157

errno = ret;

2334

if(errno != 0){

2158

2335

perror_plus("Failed to bring up interface");

2159

2336

} else {

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2337

errno = argz_add(&interfaces_to_take_down,

2338

&interfaces_to_take_down_size,

2339

interface);

2340

if(errno != 0){

2341

perror_plus("argz_add");

2342

}

2163

2343

}

2164

2344

}

2165

2345

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2169

2346

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

2170

2347

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

2171

2348

}

2172

2349

}

2173

2350

2351

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

2352

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

2353

if(debug){

2354

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

2355

mc.interfaces);

2356

}

2357

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

2358

}

2359

2174

2360

if(quit_now){

2175

2361

goto end;

2176

2362

}

2177

2363

2178

ret = init_gnutls_global(pubkey, seckey);

2364

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

2179

2365

if(ret == -1){

2180

2366

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

2181

2367

exitcode = EX_UNAVAILABLE;

2188

2374

goto end;

2189

2375

}

2190

2376

2191

if(mkdtemp(tempdir) == NULL){

2377

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

2378

tempdir = mkdtemp(run_tempdir);

2379

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

2380

if(debug){

2381

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

2382

run_tempdir, old_tempdir);

2383

}

2384

tempdir = mkdtemp(old_tempdir);

2385

}

2386

if(tempdir == NULL){

2192

2387

perror_plus("mkdtemp");

2193

2388

goto end;

2194

2389

}

2195

tempdir_created = true;

2196

2390

2197

2391

if(quit_now){

2198

2392

goto end;

2199

2393

}

2200

2394

2201

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

2395

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

2202

2396

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

2203

2397

exitcode = EX_UNAVAILABLE;

2204

2398

goto end;

2234

2428

exitcode = EX_USAGE;

2235

2429

goto end;

2236

2430

}

2237

2431

2238

2432

if(quit_now){

2239

2433

goto end;

2240

2434

}

2261

2455

}

2262

2456

2263

2457

while(not quit_now){

2264

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

2458

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

2459

&mc);

2265

2460

if(quit_now or ret == 0){

2266

2461

break;

2267

2462

}

2269

2464

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

2270

2465

(int)retry_interval);

2271

2466

}

2272

sleep((int)retry_interval);

2467

sleep((unsigned int)retry_interval);

2273

2468

}

2274

2469

2275

if (not quit_now){

2470

if(not quit_now){

2276

2471

exitcode = EXIT_SUCCESS;

2277

2472

}

2278

2473

2293

2488

config.publish_domain = 0;

2294

2489

2295

2490

/* Allocate a new server */

2296

mc.server = avahi_server_new(avahi_simple_poll_get

2297

(mc.simple_poll), &config, NULL,

2298

NULL, &ret_errno);

2491

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2492

&config, NULL, NULL, &ret_errno);

2299

2493

2300

2494

/* Free the Avahi configuration data */

2301

2495

avahi_server_config_free(&config);

2316

2510

/* Create the Avahi service browser */

2317

2511

sb = avahi_s_service_browser_new(mc.server, if_index,

2318

2512

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2319

NULL, 0, browse_callback, NULL);

2513

NULL, 0, browse_callback,

2514

(void *)&mc);

2320

2515

if(sb == NULL){

2321

2516

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

2322

2517

avahi_strerror(avahi_server_errno(mc.server)));

2333

2528

if(debug){

2334

2529

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

2335

2530

}

2336

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

2338

(int)(retry_interval * 1000));

2531

2532

ret = avahi_loop_with_timeout(simple_poll,

2533

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

2339

2534

if(debug){

2340

2535

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

2341

2536

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

2348

2543

}

2349

2544

2350

2545

/* Cleanup things */

2546

free(mc.interfaces);

2547

2351

2548

if(sb != NULL)

2352

2549

avahi_s_service_browser_free(sb);

2353

2550

2354

2551

if(mc.server != NULL)

2355

2552

avahi_server_free(mc.server);

2356

2553

2357

if(mc.simple_poll != NULL)

2358

avahi_simple_poll_free(mc.simple_poll);

2554

if(simple_poll != NULL)

2555

avahi_simple_poll_free(simple_poll);

2359

2556

2360

2557

if(gnutls_initialized){

2361

2558

gnutls_certificate_free_credentials(mc.cred);

2378

2575

}

2379

2576

}

2380

2577

2381

/* Re-raise priviliges */

2578

/* Re-raise privileges */

2382

2579

{

2383

raise_privileges();

2384

2385

/* Run network hooks */

2386

run_network_hooks("stop", interfaces_hooks, delay);

2387

2388

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

2389

{

2390

char *interface = NULL;

2391

while((interface=argz_next(interfaces_to_take_down,

2392

interfaces_to_take_down_size,

2393

interface))){

2394

ret_errno = take_down_interface(interface);

2395

if(ret_errno != 0){

2396

errno = ret_errno;

2397

perror_plus("Failed to take down interface");

2398

}

2399

}

2400

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

2401

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

2402

" down\n");

2403

}

2404

}

2405

2406

lower_privileges_permanently();

2580

ret_errno = raise_privileges();

2581

if(ret_errno != 0){

2582

perror_plus("Failed to raise privileges");

2583

} else {

2584

2585

/* Run network hooks */

2586

run_network_hooks("stop", interfaces_hooks != NULL ?

2587

interfaces_hooks : "", delay);

2588

2589

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

2590

{

2591

char *interface = NULL;

2592

while((interface=argz_next(interfaces_to_take_down,

2593

interfaces_to_take_down_size,

2594

interface))){

2595

ret_errno = take_down_interface(interface);

2596

if(ret_errno != 0){

2597

errno = ret_errno;

2598

perror_plus("Failed to take down interface");

2599

}

2600

}

2601

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

2602

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

2603

" down\n");

2604

}

2605

}

2606

}

2607

2608

ret_errno = lower_privileges_permanently();

2609

if(ret_errno != 0){

2610

perror_plus("Failed to lower privileges permanently");

2611

}

2407

2612

}

2408

2613

2409

2614

free(interfaces_to_take_down);

2410

2615

free(interfaces_hooks);

2411

2616

2412

2617

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

2413

if(tempdir_created){

2618

if(tempdir != NULL){

2414

2619

struct dirent **direntries = NULL;

2415

2620

struct dirent *direntry = NULL;

2416

2621

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

2417

2622

alphasort);

2418

if (numentries > 0){

2623

if(numentries > 0){

2419

2624

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

2420

2625

direntry = direntries[i];

2421

2626

char *fullname = NULL;

2433

2638

free(fullname);

2434

2639

}

2435

2640

}

2436

2641

2437

2642

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

2438

2643

free(direntries);

2439

if (numentries == -1){

2644

if(numentries == -1){

2440

2645

perror_plus("scandir");

2441

2646

}

2442

2647

ret = rmdir(tempdir);