/mandos/trunk : revision 600

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

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

58

inet_pton(), connect() */

60

59

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

61

60

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

62

61

*/

74

73

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

75

74

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

76

75

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

77

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

76

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

78

77

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

79

78

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

80

79

argp_state, struct argp,

92

91

argz_delete(), argz_append(),

93

92

argz_stringify(), argz_add(),

94

93

argz_count() */

95

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

96

EAI_SYSTEM, gai_strerror() */

97

94

98

95

#ifdef __linux__

99

96

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

157

154

158

155

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

159

156

typedef struct {

157

AvahiSimplePoll *simple_poll;

160

158

AvahiServer *server;

161

159

gnutls_certificate_credentials_t cred;

162

160

unsigned int dh_bits;

164

162

const char *priority;

165

163

gpgme_ctx_t ctx;

166

164

server *current_server;

167

char *interfaces;

168

size_t interfaces_size;

169

165

} mandos_context;

170

166

171

/* global so signal handler can reach it*/

172

AvahiSimplePoll *simple_poll;

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

172

174

173

sig_atomic_t quit_now = 0;

175

174

int signal_received = 0;

183

182

perror(print_text);

184

183

}

185

184

186

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

185

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

187

186

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

188

187

va_list ap;

189

188

va_start (ap, format);

190

189

191

190

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

192

191

program_invocation_short_name));

193

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

192

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

194

193

}

195

194

196

195

/*

198

197

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

199

198

* "buffer_length" is how much is already used.

200

199

*/

201

__attribute__((nonnull, warn_unused_result))

202

200

size_t incbuffer(char **buffer, size_t buffer_length,

203

201

size_t buffer_capacity){

204

202

if(buffer_length + BUFFER_SIZE > buffer_capacity){

205

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

206

if(new_buf == NULL){

207

int old_errno = errno;

208

free(*buffer);

209

errno = old_errno;

210

*buffer = NULL;

203

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

204

if(buffer == NULL){

211

205

return 0;

212

206

}

213

*buffer = new_buf;

214

207

buffer_capacity += BUFFER_SIZE;

215

208

}

216

209

return buffer_capacity;

217

210

}

218

211

219

212

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

220

__attribute__((nonnull, warn_unused_result))

221

213

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

222

int af, server **current_server){

214

int af){

223

215

int ret;

224

216

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

225

217

if(new_server == NULL){

234

226

perror_plus("strdup");

235

227

return false;

236

228

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

242

229

/* Special case of first server */

243

if(*current_server == NULL){

230

if (mc.current_server == NULL){

244

231

new_server->next = new_server;

245

232

new_server->prev = new_server;

246

*current_server = new_server;

233

mc.current_server = new_server;

234

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

247

235

} else {

248

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

249

new_server->next = *current_server;

250

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

236

new_server->next = mc.current_server;

237

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

251

238

new_server->prev->next = new_server;

252

(*current_server)->prev = 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

245

}

254

246

return true;

255

247

}

257

249

/*

258

250

* Initialize GPGME.

259

251

*/

260

__attribute__((nonnull, warn_unused_result))

261

static bool init_gpgme(const char * const seckey,

262

const char * const pubkey,

263

const char * const tempdir,

264

mandos_context *mc){

252

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

253

const char *tempdir){

265

254

gpgme_error_t rc;

266

255

gpgme_engine_info_t engine_info;

267

256

257

268

258

/*

269

259

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

270

260

*/

271

bool import_key(const char * const filename){

261

bool import_key(const char *filename){

272

262

int ret;

273

263

int fd;

274

264

gpgme_data_t pgp_data;

286

276

return false;

287

277

}

288

278

289

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

279

rc = gpgme_op_import(mc.ctx, pgp_data);

290

280

if(rc != GPG_ERR_NO_ERROR){

291

281

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

292

282

gpgme_strsource(rc), gpgme_strerror(rc));

336

326

}

337

327

338

328

/* Create new GPGME "context" */

339

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

329

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

340

330

if(rc != GPG_ERR_NO_ERROR){

341

331

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

342

332

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

355

345

* Decrypt OpenPGP data.

356

346

* Returns -1 on error

357

347

*/

358

__attribute__((nonnull, warn_unused_result))

359

348

static ssize_t pgp_packet_decrypt(const char *cryptotext,

360

349

size_t crypto_size,

361

char **plaintext,

362

mandos_context *mc){

350

char **plaintext){

363

351

gpgme_data_t dh_crypto, dh_plain;

364

352

gpgme_error_t rc;

365

353

ssize_t ret;

391

379

392

380

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

393

381

data buffer */

394

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

382

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

395

383

if(rc != GPG_ERR_NO_ERROR){

396

384

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

397

385

gpgme_strsource(rc), gpgme_strerror(rc));

398

386

plaintext_length = -1;

399

387

if(debug){

400

388

gpgme_decrypt_result_t result;

401

result = gpgme_op_decrypt_result(mc->ctx);

389

result = gpgme_op_decrypt_result(mc.ctx);

402

390

if(result == NULL){

403

391

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

404

392

} else {

481

469

return plaintext_length;

482

470

}

483

471

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

472

static const char * safer_gnutls_strerror(int value){

486

473

const char *ret = gnutls_strerror(value);

487

474

if(ret == NULL)

488

475

ret = "(unknown)";

490

477

}

491

478

492

479

/* GnuTLS log function callback */

493

__attribute__((nonnull))

494

480

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

495

481

const char* string){

496

482

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

497

483

}

498

484

499

__attribute__((nonnull, warn_unused_result))

500

485

static int init_gnutls_global(const char *pubkeyfilename,

501

const char *seckeyfilename,

502

mandos_context *mc){

486

const char *seckeyfilename){

503

487

int ret;

504

488

505

489

if(debug){

522

506

}

523

507

524

508

/* OpenPGP credentials */

525

ret = gnutls_certificate_allocate_credentials(&mc->cred);

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

526

510

if(ret != GNUTLS_E_SUCCESS){

527

511

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

528

512

safer_gnutls_strerror(ret));

538

522

}

539

523

540

524

ret = gnutls_certificate_set_openpgp_key_file

541

(mc->cred, pubkeyfilename, seckeyfilename,

525

(mc.cred, pubkeyfilename, seckeyfilename,

542

526

GNUTLS_OPENPGP_FMT_BASE64);

543

527

if(ret != GNUTLS_E_SUCCESS){

544

528

fprintf_plus(stderr,

550

534

}

551

535

552

536

/* GnuTLS server initialization */

553

ret = gnutls_dh_params_init(&mc->dh_params);

537

ret = gnutls_dh_params_init(&mc.dh_params);

554

538

if(ret != GNUTLS_E_SUCCESS){

555

539

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

556

540

" initialization: %s\n",

557

541

safer_gnutls_strerror(ret));

558

542

goto globalfail;

559

543

}

560

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

544

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

561

545

if(ret != GNUTLS_E_SUCCESS){

562

546

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

563

547

safer_gnutls_strerror(ret));

564

548

goto globalfail;

565

549

}

566

550

567

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

551

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

568

552

569

553

return 0;

570

554

571

555

globalfail:

572

556

573

gnutls_certificate_free_credentials(mc->cred);

557

gnutls_certificate_free_credentials(mc.cred);

574

558

gnutls_global_deinit();

575

gnutls_dh_params_deinit(mc->dh_params);

559

gnutls_dh_params_deinit(mc.dh_params);

576

560

return -1;

577

561

}

578

562

579

__attribute__((nonnull, warn_unused_result))

580

static int init_gnutls_session(gnutls_session_t *session,

581

mandos_context *mc){

563

static int init_gnutls_session(gnutls_session_t *session){

582

564

int ret;

583

565

/* GnuTLS session creation */

584

566

do {

596

578

{

597

579

const char *err;

598

580

do {

599

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

581

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

600

582

if(quit_now){

601

583

gnutls_deinit(*session);

602

584

return -1;

613

595

614

596

do {

615

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

616

mc->cred);

598

mc.cred);

617

599

if(quit_now){

618

600

gnutls_deinit(*session);

619

601

return -1;

629

611

/* ignore client certificate if any. */

630

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

631

613

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

633

615

634

616

return 0;

635

617

}

639

621

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

640

622

641

623

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

643

624

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

644

625

AvahiIfIndex if_index,

645

int af, mandos_context *mc){

626

int af){

646

627

int ret, tcp_sd = -1;

647

628

ssize_t sret;

648

struct sockaddr_storage to;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

649

633

char *buffer = NULL;

650

634

char *decrypted_buffer = NULL;

651

635

size_t buffer_length = 0;

675

659

return -1;

676

660

}

677

661

678

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

679

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

680

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

681

bool match = false;

682

{

683

char *interface = NULL;

684

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

685

interface))){

686

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

687

match = true;

688

break;

689

}

690

}

691

}

692

if(not match){

693

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

694

connect to the server */

695

if(debug){

696

char interface[IF_NAMESIZE];

697

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

698

perror_plus("if_indextoname");

699

} else {

700

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

701

" \"%s\"\n",

702

if_indextoname((unsigned int)if_index,

703

interface));

704

}

705

}

706

return -1;

707

}

708

}

709

710

ret = init_gnutls_session(&session, mc);

662

ret = init_gnutls_session(&session);

711

663

if(ret != 0){

712

664

return -1;

713

665

}

732

684

733

685

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

734

686

if(af == AF_INET6){

735

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

736

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

687

to.in6.sin6_family = (sa_family_t)af;

688

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

737

689

} else { /* IPv4 */

738

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

739

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

690

to.in.sin_family = (sa_family_t)af;

691

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

740

692

}

741

693

if(ret < 0 ){

742

694

int e = errno;

751

703

goto mandos_end;

752

704

}

753

705

if(af == AF_INET6){

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

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*/

757

710

if(if_index == AVAHI_IF_UNSPEC){

758

711

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

759

712

" incomplete without a network interface\n");

761

714

goto mandos_end;

762

715

}

763

716

/* Set the network interface number as scope */

764

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

717

to.in6.sin6_scope_id = (uint32_t)if_index;

765

718

}

766

719

} else {

767

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

720

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

721

-Wconversion and

722

-Wunreachable-code */

768

723

}

769

724

770

725

if(quit_now){

787

742

}

788

743

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

789

744

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

745

const char *pcret;

790

746

if(af == AF_INET6){

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

747

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

748

sizeof(addrstr));

795

749

} else {

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

750

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

751

sizeof(addrstr));

800

752

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

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

805

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

806

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

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

}

807

759

}

808

760

}

809

761

813

765

}

814

766

815

767

if(af == AF_INET6){

816

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

817

sizeof(struct sockaddr_in6));

768

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

818

769

} else {

819

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

820

sizeof(struct sockaddr_in));

770

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

821

771

}

822

772

if(ret < 0){

823

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

773

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

824

774

int e = errno;

825

775

perror_plus("connect");

826

776

errno = e;

987

937

if(buffer_length > 0){

988

938

ssize_t decrypted_buffer_size;

989

939

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

990

&decrypted_buffer, mc);

940

&decrypted_buffer);

991

941

if(decrypted_buffer_size >= 0){

992

942

993

943

written = 0;

1041

991

return retval;

1042

992

}

1043

993

1044

__attribute__((nonnull))

1045

994

static void resolve_callback(AvahiSServiceResolver *r,

1046

995

AvahiIfIndex interface,

1047

996

AvahiProtocol proto,

1055

1004

AVAHI_GCC_UNUSED AvahiStringList *txt,

1056

1005

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1057

1006

flags,

1058

void *mc){

1007

AVAHI_GCC_UNUSED void* userdata){

1059

1008

if(r == NULL){

1060

1009

return;

1061

1010

}

1073

1022

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

1074

1023

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

1075

1024

domain,

1076

avahi_strerror(avahi_server_errno

1077

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

1025

avahi_strerror(avahi_server_errno(mc.server)));

1078

1026

break;

1079

1027

1080

1028

case AVAHI_RESOLVER_FOUND:

1088

1036

}

1089

1037

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

1090

1038

interface,

1091

avahi_proto_to_af(proto),

1092

mc);

1039

avahi_proto_to_af(proto));

1093

1040

if(ret == 0){

1094

avahi_simple_poll_quit(simple_poll);

1041

avahi_simple_poll_quit(mc.simple_poll);

1095

1042

} else {

1096

1043

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

1097

avahi_proto_to_af(proto),

1098

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

1044

avahi_proto_to_af(proto))){

1099

1045

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

1100

1046

" list\n", name);

1101

1047

}

1114

1060

const char *domain,

1115

1061

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1116

1062

flags,

1117

void *mc){

1063

AVAHI_GCC_UNUSED void* userdata){

1118

1064

if(b == NULL){

1119

1065

return;

1120

1066

}

1131

1077

case AVAHI_BROWSER_FAILURE:

1132

1078

1133

1079

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

1134

avahi_strerror(avahi_server_errno

1135

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

1136

avahi_simple_poll_quit(simple_poll);

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1137

1082

return;

1138

1083

1139

1084

case AVAHI_BROWSER_NEW:

1142

1087

the callback function is called the Avahi server will free the

1143

1088

resolver for us. */

1144

1089

1145

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

1146

interface, protocol, name, type,

1147

domain, protocol, 0,

1148

resolve_callback, mc) == NULL)

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1149

1093

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

1150

1094

" %s\n", name,

1151

avahi_strerror(avahi_server_errno

1152

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

1095

avahi_strerror(avahi_server_errno(mc.server)));

1153

1096

break;

1154

1097

1155

1098

case AVAHI_BROWSER_REMOVE:

1174

1117

signal_received = sig;

1175

1118

int old_errno = errno;

1176

1119

/* set main loop to exit */

1177

if(simple_poll != NULL){

1178

avahi_simple_poll_quit(simple_poll);

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1179

1122

}

1180

1123

errno = old_errno;

1181

1124

}

1182

1125

1183

__attribute__((nonnull, warn_unused_result))

1184

1126

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

1185

1127

int ret;

1186

1128

error_t ret_errno;

1205

1147

return true;

1206

1148

}

1207

1149

1208

__attribute__((nonnull, warn_unused_result))

1209

1150

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

1210

1151

1211

1152

/* Reject the loopback device */

1253

1194

* corresponds to an acceptable network device.

1254

1195

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

1255

1196

*/

1256

__attribute__((nonnull, warn_unused_result))

1257

1197

int good_interface(const struct dirent *if_entry){

1258

1198

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

1259

1199

return 0;

1277

1217

/*

1278

1218

* This function determines if a network interface is up.

1279

1219

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

1220

bool interface_is_up(const char *interface){

1282

1221

struct ifreq ifr;

1283

1222

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

1294

1233

/*

1295

1234

* This function determines if a network interface is running

1296

1235

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

1236

bool interface_is_running(const char *interface){

1299

1237

struct ifreq ifr;

1300

1238

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

1308

1246

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

1309

1247

}

1310

1248

1311

__attribute__((nonnull, pure, warn_unused_result))

1312

1249

int notdotentries(const struct dirent *direntry){

1313

1250

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

1314

1251

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

1321

1258

}

1322

1259

1323

1260

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

1324

__attribute__((nonnull, warn_unused_result))

1325

1261

int runnable_hook(const struct dirent *direntry){

1326

1262

int ret;

1327

1263

size_t sret;

1335

1271

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

1336

1272

"abcdefghijklmnopqrstuvwxyz"

1337

1273

"0123456789"

1338

"_.-");

1274

"_-");

1339

1275

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

1340

1276

/* Contains non-allowed characters */

1341

1277

if(debug){

1359

1295

}

1360

1296

return 0;

1361

1297

}

1362

free(fullname);

1363

1298

if(not (S_ISREG(st.st_mode))){

1364

1299

/* Not a regular file */

1365

1300

if(debug){

1383

1318

return 1;

1384

1319

}

1385

1320

1386

__attribute__((nonnull, warn_unused_result))

1387

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1388

mandos_context *mc){

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1389

1322

int ret;

1390

1323

struct timespec now;

1391

1324

struct timespec waited_time;

1392

1325

intmax_t block_time;

1393

1326

1394

1327

while(true){

1395

if(mc->current_server == NULL){

1396

if(debug){

1328

if(mc.current_server == NULL){

1329

if (debug){

1397

1330

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

1398

1331

" No timeout!\n");

1399

1332

}

1400

1333

ret = avahi_simple_poll_iterate(s, -1);

1401

1334

} else {

1402

if(debug){

1335

if (debug){

1403

1336

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

1404

1337

" it, or wait\n");

1405

1338

}

1412

1345

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

1413

1346

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

1414

1347

waited_time.tv_sec = (now.tv_sec

1415

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

1348

- mc.current_server->last_seen.tv_sec);

1416

1349

waited_time.tv_nsec = (now.tv_nsec

1417

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

1350

- mc.current_server->last_seen.tv_nsec);

1418

1351

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

1419

1352

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

1420

1353

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

1422

1355

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

1423

1356

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

1424

1357

1425

if(debug){

1358

if (debug){

1426

1359

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

1427

1360

block_time);

1428

1361

}

1429

1362

1430

1363

if(block_time <= 0){

1431

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

1432

mc->current_server->port,

1433

mc->current_server->if_index,

1434

mc->current_server->af, mc);

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1435

1368

if(ret == 0){

1436

avahi_simple_poll_quit(s);

1369

avahi_simple_poll_quit(mc.simple_poll);

1437

1370

return 0;

1438

1371

}

1439

1372

ret = clock_gettime(CLOCK_MONOTONIC,

1440

&mc->current_server->last_seen);

1373

&mc.current_server->last_seen);

1441

1374

if(ret == -1){

1442

1375

perror_plus("clock_gettime");

1443

1376

return -1;

1444

1377

}

1445

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

1378

mc.current_server = mc.current_server->next;

1446

1379

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

1447

1380

servers, but don't block */

1448

1381

}

1450

1383

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

1451

1384

}

1452

1385

if(ret != 0){

1453

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

1386

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

1454

1387

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

1455

1388

}

1456

1389

}

1458

1391

}

1459

1392

1460

1393

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

1461

__attribute__((warn_unused_result))

1462

1394

error_t raise_privileges(void){

1463

1395

error_t old_errno = errno;

1464

1396

error_t ret_errno = 0;

1471

1403

}

1472

1404

1473

1405

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

1474

__attribute__((warn_unused_result))

1475

1406

error_t raise_privileges_permanently(void){

1476

1407

error_t old_errno = errno;

1477

1408

error_t ret_errno = raise_privileges();

1488

1419

}

1489

1420

1490

1421

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

1491

__attribute__((warn_unused_result))

1492

1422

error_t lower_privileges(void){

1493

1423

error_t old_errno = errno;

1494

1424

error_t ret_errno = 0;

1501

1431

}

1502

1432

1503

1433

/* Lower privileges permanently */

1504

__attribute__((warn_unused_result))

1505

1434

error_t lower_privileges_permanently(void){

1506

1435

error_t old_errno = errno;

1507

1436

error_t ret_errno = 0;

1513

1442

return ret_errno;

1514

1443

}

1515

1444

1516

__attribute__((nonnull))

1517

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

1445

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

1518

1446

const float delay){

1519

1447

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1520

1450

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

1521

1451

alphasort);

1522

1452

if(numhooks == -1){

1529

1459

perror_plus("scandir");

1530

1460

}

1531

1461

} else {

1532

struct dirent *direntry;

1533

int ret;

1534

1462

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

1535

1463

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

1536

1464

direntry = direntries[i];

1548

1476

if(hook_pid == 0){

1549

1477

/* Child */

1550

1478

/* Raise privileges */

1551

if(raise_privileges_permanently() != 0){

1552

perror_plus("Failed to raise privileges");

1553

_exit(EX_NOPERM);

1554

}

1479

raise_privileges_permanently();

1555

1480

/* Set group */

1556

1481

errno = 0;

1557

1482

ret = setgid(0);

1558

1483

if(ret == -1){

1559

1484

perror_plus("setgid");

1560

_exit(EX_NOPERM);

1561

1485

}

1562

1486

/* Reset supplementary groups */

1563

1487

errno = 0;

1564

1488

ret = setgroups(0, NULL);

1565

1489

if(ret == -1){

1566

1490

perror_plus("setgroups");

1567

_exit(EX_NOPERM);

1568

}

1569

ret = dup2(devnull, STDIN_FILENO);

1570

if(ret == -1){

1571

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

1572

_exit(EX_OSERR);

1573

}

1574

ret = close(devnull);

1575

if(ret == -1){

1576

perror_plus("close");

1577

_exit(EX_OSERR);

1578

}

1579

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1580

if(ret == -1){

1581

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

1582

_exit(EX_OSERR);

1583

}

1491

}

1492

dup2(devnull, STDIN_FILENO);

1493

close(devnull);

1494

dup2(STDERR_FILENO, STDOUT_FILENO);

1584

1495

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

1585

1496

if(ret == -1){

1586

1497

perror_plus("setenv");

1602

1513

_exit(EX_OSERR);

1603

1514

}

1604

1515

char *delaystring;

1605

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

1516

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

1606

1517

if(ret == -1){

1607

1518

perror_plus("asprintf");

1608

1519

_exit(EX_OSERR);

1661

1572

}

1662

1573

close(devnull);

1663

1574

}

1575

return true;

1664

1576

}

1665

1577

1666

__attribute__((nonnull, warn_unused_result))

1667

1578

error_t bring_up_interface(const char *const interface,

1668

1579

const float delay){

1580

int sd = -1;

1669

1581

error_t old_errno = errno;

1670

int ret;

1582

error_t ret_errno = 0;

1583

int ret, ret_setflags;

1671

1584

struct ifreq network;

1672

1585

unsigned int if_index = if_nametoindex(interface);

1673

1586

if(if_index == 0){

1682

1595

}

1683

1596

1684

1597

if(not interface_is_up(interface)){

1685

error_t ret_errno = 0, ioctl_errno = 0;

1686

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

1598

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

1687

1599

ret_errno = errno;

1688

1600

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

1689

1601

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

1690

errno = old_errno;

1691

1602

return ret_errno;

1692

1603

}

1693

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

1604

network.ifr_flags |= IFF_UP;

1694

1605

1695

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

1696

if(sd == -1){

1606

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1607

if(sd < 0){

1697

1608

ret_errno = errno;

1698

1609

perror_plus("socket");

1699

1610

errno = old_errno;

1700

1611

return ret_errno;

1701

1612

}

1702

1613

1703

1614

if(quit_now){

1704

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

1705

if(ret == -1){

1706

perror_plus("close");

1707

}

1615

close(sd);

1708

1616

errno = old_errno;

1709

1617

return EINTR;

1710

1618

}

1714

1622

interface);

1715

1623

}

1716

1624

1717

/* Raise privileges */

1718

ret_errno = raise_privileges();

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1625

/* Raise priviliges */

1626

raise_privileges();

1722

1627

1723

1628

#ifdef __linux__

1724

int ret_linux;

1725

bool restore_loglevel = false;

1726

if(ret_errno == 0){

1727

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1728

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

1729

ret_linux = klogctl(8, NULL, 5);

1730

if(ret_linux == -1){

1731

perror_plus("klogctl");

1732

} else {

1733

restore_loglevel = true;

1734

}

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");

1735

1636

}

1736

1637

#endif /* __linux__ */

1737

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

1738

ioctl_errno = errno;

1638

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

1639

ret_errno = errno;

1739

1640

#ifdef __linux__

1740

1641

if(restore_loglevel){

1741

1642

ret_linux = klogctl(7, NULL, 0);

1745

1646

}

1746

1647

#endif /* __linux__ */

1747

1648

1748

/* If raise_privileges() succeeded above */

1749

if(ret_errno == 0){

1750

/* Lower privileges */

1751

ret_errno = lower_privileges();

1752

if(ret_errno != 0){

1753

errno = ret_errno;

1754

perror_plus("Failed to lower privileges");

1755

}

1756

}

1649

/* Lower privileges */

1650

lower_privileges();

1757

1651

1758

1652

/* Close the socket */

1759

1653

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

1762

1656

}

1763

1657

1764

1658

if(ret_setflags == -1){

1765

errno = ioctl_errno;

1659

errno = ret_errno;

1766

1660

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1767

1661

errno = old_errno;

1768

return ioctl_errno;

1662

return ret_errno;

1769

1663

}

1770

1664

} else if(debug){

1771

1665

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

1789

1683

return 0;

1790

1684

}

1791

1685

1792

__attribute__((nonnull, warn_unused_result))

1793

1686

error_t take_down_interface(const char *const interface){

1687

int sd = -1;

1794

1688

error_t old_errno = errno;

1689

error_t ret_errno = 0;

1690

int ret, ret_setflags;

1795

1691

struct ifreq network;

1796

1692

unsigned int if_index = if_nametoindex(interface);

1797

1693

if(if_index == 0){

1800

1696

return ENXIO;

1801

1697

}

1802

1698

if(interface_is_up(interface)){

1803

error_t ret_errno = 0, ioctl_errno = 0;

1804

1699

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

1805

1700

ret_errno = errno;

1806

1701

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

1807

1702

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

1808

errno = old_errno;

1809

1703

return ret_errno;

1810

1704

}

1811

1705

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

1812

1706

1813

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

1814

if(sd == -1){

1707

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1708

if(sd < 0){

1815

1709

ret_errno = errno;

1816

1710

perror_plus("socket");

1817

1711

errno = old_errno;

1823

1717

interface);

1824

1718

}

1825

1719

1826

/* Raise privileges */

1827

ret_errno = raise_privileges();

1828

if(ret_errno != 0){

1829

perror_plus("Failed to raise privileges");

1830

}

1831

1832

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

1833

ioctl_errno = errno;

1834

1835

/* If raise_privileges() succeeded above */

1836

if(ret_errno == 0){

1837

/* Lower privileges */

1838

ret_errno = lower_privileges();

1839

if(ret_errno != 0){

1840

errno = ret_errno;

1841

perror_plus("Failed to lower privileges");

1842

}

1843

}

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();

1844

1728

1845

1729

/* Close the socket */

1846

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

1730

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

1847

1731

if(ret == -1){

1848

1732

perror_plus("close");

1849

1733

}

1850

1734

1851

1735

if(ret_setflags == -1){

1852

errno = ioctl_errno;

1736

errno = ret_errno;

1853

1737

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1854

1738

errno = old_errno;

1855

return ioctl_errno;

1739

return ret_errno;

1856

1740

}

1857

1741

} else if(debug){

1858

1742

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

1864

1748

}

1865

1749

1866

1750

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

1867

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

1868

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

1869

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

1870

.interfaces = NULL, .interfaces_size = 0 };

1871

1751

AvahiSServiceBrowser *sb = NULL;

1872

1752

error_t ret_errno;

1873

1753

int ret;

1874

1754

intmax_t tmpmax;

1875

1755

char *tmp;

1876

1756

int exitcode = EXIT_SUCCESS;

1757

char *interfaces = NULL;

1758

size_t interfaces_size = 0;

1877

1759

char *interfaces_to_take_down = NULL;

1878

1760

size_t interfaces_to_take_down_size = 0;

1879

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

1880

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

1881

char *tempdir = NULL;

1761

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

1762

bool tempdir_created = false;

1882

1763

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1883

1764

const char *seckey = PATHDIR "/" SECKEY;

1884

1765

const char *pubkey = PATHDIR "/" PUBKEY;

1885

1766

char *interfaces_hooks = NULL;

1767

size_t interfaces_hooks_size = 0;

1886

1768

1887

1769

bool gnutls_initialized = false;

1888

1770

bool gpgme_initialized = false;

1979

1861

connect_to = arg;

1980

1862

break;

1981

1863

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

1982

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

1983

arg, (int)',');

1864

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

1865

(int)',');

1984

1866

if(ret_errno != 0){

1985

1867

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

1986

1868

}

2066

1948

/* Work around Debian bug #633582:

2067

1949

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

2068

1950

2069

/* Re-raise privileges */

2070

ret_errno = raise_privileges();

2071

if(ret_errno != 0){

2072

errno = ret_errno;

2073

perror_plus("Failed to raise privileges");

2074

} else {

1951

/* Re-raise priviliges */

1952

if(raise_privileges() == 0){

2075

1953

struct stat st;

2076

1954

2077

1955

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

2117

1995

}

2118

1996

2119

1997

/* Lower privileges */

2120

ret_errno = lower_privileges();

2121

if(ret_errno != 0){

2122

errno = ret_errno;

2123

perror_plus("Failed to lower privileges");

1998

errno = 0;

1999

ret = seteuid(uid);

2000

if(ret == -1){

2001

perror_plus("seteuid");

2124

2002

}

2125

2003

}

2126

2004

}

2127

2005

2128

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

2006

/* Remove empty interface names */

2129

2007

{

2130

2008

char *interface = NULL;

2131

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

2009

while((interface = argz_next(interfaces, interfaces_size,

2132

2010

interface))){

2133

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

2134

and if_nametoindex(interface) == 0){

2135

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

2011

if(if_nametoindex(interface) == 0){

2012

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

2136

2013

fprintf_plus(stderr, "Not using nonexisting interface"

2137

2014

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

2138

2015

}

2139

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

2016

argz_delete(&interfaces, &interfaces_size, interface);

2140

2017

interface = NULL;

2141

2018

}

2142

2019

}

2144

2021

2145

2022

/* Run network hooks */

2146

2023

{

2147

if(mc.interfaces != NULL){

2148

interfaces_hooks = malloc(mc.interfaces_size);

2024

2025

if(interfaces != NULL){

2026

interfaces_hooks = malloc(interfaces_size);

2149

2027

if(interfaces_hooks == NULL){

2150

2028

perror_plus("malloc");

2151

2029

goto end;

2152

2030

}

2153

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

2154

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

2155

}

2156

run_network_hooks("start", interfaces_hooks != NULL ?

2157

interfaces_hooks : "", delay);

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

}

2158

2040

}

2159

2041

2160

2042

if(not debug){

2165

2047

from the signal handler */

2166

2048

/* Initialize the pseudo-RNG for Avahi */

2167

2049

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

2168

simple_poll = avahi_simple_poll_new();

2169

if(simple_poll == NULL){

2050

mc.simple_poll = avahi_simple_poll_new();

2051

if(mc.simple_poll == NULL){

2170

2052

fprintf_plus(stderr,

2171

2053

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

2172

2054

exitcode = EX_UNAVAILABLE;

2237

2119

}

2238

2120

2239

2121

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

2240

if(mc.interfaces == NULL){

2122

if(interfaces == NULL){

2241

2123

struct dirent **direntries;

2242

2124

/* Look for any good interfaces */

2243

2125

ret = scandir(sys_class_net, &direntries, good_interface,

2245

2127

if(ret >= 1){

2246

2128

/* Add all found interfaces to interfaces list */

2247

2129

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

2248

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

2130

ret_errno = argz_add(&interfaces, &interfaces_size,

2249

2131

direntries[i]->d_name);

2250

2132

if(ret_errno != 0){

2251

errno = ret_errno;

2252

2133

perror_plus("argz_add");

2253

2134

continue;

2254

2135

}

2266

2147

}

2267

2148

}

2268

2149

2269

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

2270

{

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)){

2271

2162

char *interface = NULL;

2272

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

2163

while((interface = argz_next(interfaces, interfaces_size,

2273

2164

interface))){

2274

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

2275

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

2276

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

2277

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

2278

interface);

2279

interface = NULL;

2280

while((interface = argz_next(mc.interfaces,

2281

mc.interfaces_size, interface))){

2282

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

2283

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

2284

interface);

2285

interface = NULL;

2286

}

2287

}

2288

break;

2289

}

2290

2165

bool interface_was_up = interface_is_up(interface);

2291

errno = bring_up_interface(interface, delay);

2166

ret = bring_up_interface(interface, delay);

2292

2167

if(not interface_was_up){

2293

if(errno != 0){

2168

if(ret != 0){

2169

errno = ret;

2294

2170

perror_plus("Failed to bring up interface");

2295

2171

} else {

2296

errno = argz_add(&interfaces_to_take_down,

2297

&interfaces_to_take_down_size,

2298

interface);

2299

if(errno != 0){

2300

perror_plus("argz_add");

2301

}

2172

ret_errno = argz_add(&interfaces_to_take_down,

2173

&interfaces_to_take_down_size,

2174

interface);

2302

2175

}

2303

2176

}

2304

2177

}

2178

free(interfaces);

2179

interfaces = NULL;

2180

interfaces_size = 0;

2305

2181

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

2306

2182

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

2307

2183

}

2308

2184

}

2309

2185

2310

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

2311

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

2312

if(debug){

2313

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

2314

mc.interfaces);

2315

}

2316

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

2317

}

2318

2319

2186

if(quit_now){

2320

2187

goto end;

2321

2188

}

2322

2189

2323

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

2190

ret = init_gnutls_global(pubkey, seckey);

2324

2191

if(ret == -1){

2325

2192

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

2326

2193

exitcode = EX_UNAVAILABLE;

2333

2200

goto end;

2334

2201

}

2335

2202

2336

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

2337

tempdir = mkdtemp(run_tempdir);

2338

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

2339

if(debug){

2340

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

2341

run_tempdir, old_tempdir);

2342

}

2343

tempdir = mkdtemp(old_tempdir);

2344

}

2345

if(tempdir == NULL){

2203

if(mkdtemp(tempdir) == NULL){

2346

2204

perror_plus("mkdtemp");

2347

2205

goto end;

2348

2206

}

2207

tempdir_created = true;

2349

2208

2350

2209

if(quit_now){

2351

2210

goto end;

2352

2211

}

2353

2212

2354

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

2213

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

2355

2214

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

2356

2215

exitcode = EX_UNAVAILABLE;

2357

2216

goto end;

2387

2246

exitcode = EX_USAGE;

2388

2247

goto end;

2389

2248

}

2390

2249

2391

2250

if(quit_now){

2392

2251

goto end;

2393

2252

}

2414

2273

}

2415

2274

2416

2275

while(not quit_now){

2417

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

2418

&mc);

2276

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

2419

2277

if(quit_now or ret == 0){

2420

2278

break;

2421

2279

}

2423

2281

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

2424

2282

(int)retry_interval);

2425

2283

}

2426

sleep((unsigned int)retry_interval);

2284

sleep((int)retry_interval);

2427

2285

}

2428

2286

2429

if(not quit_now){

2287

if (not quit_now){

2430

2288

exitcode = EXIT_SUCCESS;

2431

2289

}

2432

2290

2447

2305

config.publish_domain = 0;

2448

2306

2449

2307

/* Allocate a new server */

2450

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2451

&config, NULL, NULL, &ret_errno);

2308

mc.server = avahi_server_new(avahi_simple_poll_get

2309

(mc.simple_poll), &config, NULL,

2310

NULL, &ret_errno);

2452

2311

2453

2312

/* Free the Avahi configuration data */

2454

2313

avahi_server_config_free(&config);

2469

2328

/* Create the Avahi service browser */

2470

2329

sb = avahi_s_service_browser_new(mc.server, if_index,

2471

2330

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2472

NULL, 0, browse_callback,

2473

(void *)&mc);

2331

NULL, 0, browse_callback, NULL);

2474

2332

if(sb == NULL){

2475

2333

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

2476

2334

avahi_strerror(avahi_server_errno(mc.server)));

2487

2345

if(debug){

2488

2346

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

2489

2347

}

2490

2491

ret = avahi_loop_with_timeout(simple_poll,

2492

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

2348

2349

ret = avahi_loop_with_timeout(mc.simple_poll,

2350

(int)(retry_interval * 1000));

2493

2351

if(debug){

2494

2352

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

2495

2353

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

2502

2360

}

2503

2361

2504

2362

/* Cleanup things */

2505

free(mc.interfaces);

2506

2507

2363

if(sb != NULL)

2508

2364

avahi_s_service_browser_free(sb);

2509

2365

2510

2366

if(mc.server != NULL)

2511

2367

avahi_server_free(mc.server);

2512

2368

2513

if(simple_poll != NULL)

2514

avahi_simple_poll_free(simple_poll);

2369

if(mc.simple_poll != NULL)

2370

avahi_simple_poll_free(mc.simple_poll);

2515

2371

2516

2372

if(gnutls_initialized){

2517

2373

gnutls_certificate_free_credentials(mc.cred);

2534

2390

}

2535

2391

}

2536

2392

2537

/* Re-raise privileges */

2393

/* Re-raise priviliges */

2538

2394

{

2539

ret_errno = raise_privileges();

2540

if(ret_errno != 0){

2541

perror_plus("Failed to raise privileges");

2542

} else {

2543

2544

/* Run network hooks */

2545

run_network_hooks("stop", interfaces_hooks != NULL ?

2546

interfaces_hooks : "", delay);

2547

2548

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

2549

{

2550

char *interface = NULL;

2551

while((interface=argz_next(interfaces_to_take_down,

2552

interfaces_to_take_down_size,

2553

interface))){

2554

ret_errno = take_down_interface(interface);

2555

if(ret_errno != 0){

2556

errno = ret_errno;

2557

perror_plus("Failed to take down interface");

2558

}

2559

}

2560

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

2561

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

2562

" down\n");

2563

}

2564

}

2565

}

2566

2567

ret_errno = lower_privileges_permanently();

2568

if(ret_errno != 0){

2569

perror_plus("Failed to lower privileges permanently");

2570

}

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();

2571

2420

}

2572

2421

2573

2422

free(interfaces_to_take_down);

2574

2423

free(interfaces_hooks);

2575

2424

2576

2425

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

2577

if(tempdir != NULL){

2426

if(tempdir_created){

2578

2427

struct dirent **direntries = NULL;

2579

2428

struct dirent *direntry = NULL;

2580

2429

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

2581

2430

alphasort);

2582

if(numentries > 0){

2431

if (numentries > 0){

2583

2432

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

2584

2433

direntry = direntries[i];

2585

2434

char *fullname = NULL;

2597

2446

free(fullname);

2598

2447

}

2599

2448

}

2600

2449

2601

2450

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

2602

2451

free(direntries);

2603

if(numentries == -1){

2452

if (numentries == -1){

2604

2453

perror_plus("scandir");

2605

2454

}

2606

2455

ret = rmdir(tempdir);