/mandos/release : revision 237.7.77

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

41

42

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

43

stdout, ferror(), remove() */

44

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

44

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

45

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

46

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

47

strtof(), abort() */

61

*/

62

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

63

strtoimax() */

64

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

64

65

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

65

66

program_invocation_short_name */

66

67

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

87

88

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

88

89

WEXITSTATUS(), WTERMSIG() */

89

90

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

90

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

91

argz_delete(), argz_append(),

92

argz_stringify(), argz_add(),

93

argz_count() */

94

91

95

92

#ifdef __linux__

96

93

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

138

135

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

139

136

char *connect_to = NULL;

140

137

const char *hookdir = HOOKDIR;

141

uid_t uid = 65534;

142

gid_t gid = 65534;

143

138

144

139

/* Doubly linked list that need to be circularly linked when used */

145

140

typedef struct server{

146

141

const char *ip;

147

in_port_t port;

142

uint16_t port;

148

143

AvahiIfIndex if_index;

149

144

int af;

150

145

struct timespec last_seen;

154

149

155

150

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

156

151

typedef struct {

152

AvahiSimplePoll *simple_poll;

157

153

AvahiServer *server;

158

154

gnutls_certificate_credentials_t cred;

159

155

unsigned int dh_bits;

161

157

const char *priority;

162

158

gpgme_ctx_t ctx;

163

159

server *current_server;

164

char *interfaces;

165

size_t interfaces_size;

166

160

} mandos_context;

167

161

168

/* global so signal handler can reach it*/

169

AvahiSimplePoll *simple_poll;

162

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

163

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

164

.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

170

167

171

168

sig_atomic_t quit_now = 0;

172

169

int signal_received = 0;

173

170

174

171

/* Function to use when printing errors */

175

172

void perror_plus(const char *print_text){

176

int e = errno;

177

173

fprintf(stderr, "Mandos plugin %s: ",

178

174

program_invocation_short_name);

179

errno = e;

180

175

perror(print_text);

181

176

}

182

177

183

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

184

178

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

185

179

va_list ap;

186

180

va_start (ap, format);

187

181

188

182

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

189

183

program_invocation_short_name));

190

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

184

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

191

185

}

192

186

193

187

/*

208

202

}

209

203

210

204

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

211

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

212

int af, server **current_server){

205

int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,

206

int af){

213

207

int ret;

214

208

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

215

209

if(new_server == NULL){

216

210

perror_plus("malloc");

217

return false;

211

return -1;

218

212

}

219

213

*new_server = (server){ .ip = strdup(ip),

220

214

.port = port,

222

216

.af = af };

223

217

if(new_server->ip == NULL){

224

218

perror_plus("strdup");

225

return false;

219

return -1;

226

220

}

227

221

/* Special case of first server */

228

if(*current_server == NULL){

222

if (mc.current_server == NULL){

229

223

new_server->next = new_server;

230

224

new_server->prev = new_server;

231

*current_server = new_server;

225

mc.current_server = new_server;

232

226

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

233

227

} else {

234

new_server->next = *current_server;

235

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

228

new_server->next = mc.current_server;

229

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

236

230

new_server->prev->next = new_server;

237

(*current_server)->prev = new_server;

231

mc.current_server->prev = new_server;

238

232

}

239

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

233

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

240

234

if(ret == -1){

241

235

perror_plus("clock_gettime");

242

return false;

236

return -1;

243

237

}

244

return true;

238

return 0;

245

239

}

246

240

247

241

/*

248

242

* Initialize GPGME.

249

243

*/

250

244

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

251

const char *tempdir, mandos_context *mc){

245

const char *tempdir){

252

246

gpgme_error_t rc;

253

247

gpgme_engine_info_t engine_info;

254

248

249

255

250

/*

256

251

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

257

252

*/

273

268

return false;

274

269

}

275

270

276

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

271

rc = gpgme_op_import(mc.ctx, pgp_data);

277

272

if(rc != GPG_ERR_NO_ERROR){

278

273

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

279

274

gpgme_strsource(rc), gpgme_strerror(rc));

323

318

}

324

319

325

320

/* Create new GPGME "context" */

326

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

321

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

327

322

if(rc != GPG_ERR_NO_ERROR){

328

323

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

329

324

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

344

339

*/

345

340

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

341

size_t crypto_size,

347

char **plaintext,

348

mandos_context *mc){

342

char **plaintext){

349

343

gpgme_data_t dh_crypto, dh_plain;

350

344

gpgme_error_t rc;

351

345

ssize_t ret;

377

371

378

372

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

379

373

data buffer */

380

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

374

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

381

375

if(rc != GPG_ERR_NO_ERROR){

382

376

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

383

377

gpgme_strsource(rc), gpgme_strerror(rc));

384

378

plaintext_length = -1;

385

379

if(debug){

386

380

gpgme_decrypt_result_t result;

387

result = gpgme_op_decrypt_result(mc->ctx);

381

result = gpgme_op_decrypt_result(mc.ctx);

388

382

if(result == NULL){

389

383

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

390

384

} else {

468

462

}

469

463

470

464

static const char * safer_gnutls_strerror(int value){

471

const char *ret = gnutls_strerror(value);

465

const char *ret = gnutls_strerror(value); /* Spurious warning from

466

-Wunreachable-code */

472

467

if(ret == NULL)

473

468

ret = "(unknown)";

474

469

return ret;

481

476

}

482

477

483

478

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename,

485

mandos_context *mc){

479

const char *seckeyfilename){

486

480

int ret;

487

481

488

482

if(debug){

505

499

}

506

500

507

501

/* OpenPGP credentials */

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

509

503

if(ret != GNUTLS_E_SUCCESS){

510

504

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

511

505

safer_gnutls_strerror(ret));

521

515

}

522

516

523

517

ret = gnutls_certificate_set_openpgp_key_file

524

(mc->cred, pubkeyfilename, seckeyfilename,

518

(mc.cred, pubkeyfilename, seckeyfilename,

525

519

GNUTLS_OPENPGP_FMT_BASE64);

526

520

if(ret != GNUTLS_E_SUCCESS){

527

521

fprintf_plus(stderr,

533

527

}

534

528

535

529

/* GnuTLS server initialization */

536

ret = gnutls_dh_params_init(&mc->dh_params);

530

ret = gnutls_dh_params_init(&mc.dh_params);

537

531

if(ret != GNUTLS_E_SUCCESS){

538

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

533

" initialization: %s\n",

540

534

safer_gnutls_strerror(ret));

541

535

goto globalfail;

542

536

}

543

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

537

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

544

538

if(ret != GNUTLS_E_SUCCESS){

545

539

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

546

540

safer_gnutls_strerror(ret));

547

541

goto globalfail;

548

542

}

549

543

550

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

544

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

551

545

552

546

return 0;

553

547

554

548

globalfail:

555

549

556

gnutls_certificate_free_credentials(mc->cred);

550

gnutls_certificate_free_credentials(mc.cred);

557

551

gnutls_global_deinit();

558

gnutls_dh_params_deinit(mc->dh_params);

552

gnutls_dh_params_deinit(mc.dh_params);

559

553

return -1;

560

554

}

561

555

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

556

static int init_gnutls_session(gnutls_session_t *session){

564

557

int ret;

565

558

/* GnuTLS session creation */

566

559

do {

578

571

{

579

572

const char *err;

580

573

do {

581

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

574

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

582

575

if(quit_now){

583

576

gnutls_deinit(*session);

584

577

return -1;

595

588

596

589

do {

597

590

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc->cred);

591

mc.cred);

599

592

if(quit_now){

600

593

gnutls_deinit(*session);

601

594

return -1;

611

604

/* ignore client certificate if any. */

612

605

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

606

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

615

608

616

609

return 0;

617

610

}

621

614

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

622

615

623

616

/* Called when a Mandos server is found */

624

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

617

static int start_mandos_communication(const char *ip, uint16_t port,

625

618

AvahiIfIndex if_index,

626

int af, mandos_context *mc){

619

int af){

627

620

int ret, tcp_sd = -1;

628

621

ssize_t sret;

629

622

union {

659

652

return -1;

660

653

}

661

654

662

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

663

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

664

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

665

bool match = false;

666

{

667

char *interface = NULL;

668

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

669

interface))){

670

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

671

match = true;

672

break;

673

}

674

}

675

}

676

if(not match){

677

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

678

connect to the server */

679

if(debug){

680

char interface[IF_NAMESIZE];

681

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

682

perror_plus("if_indextoname");

683

} else {

684

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

685

" \"%s\"\n",

686

if_indextoname((unsigned int)if_index,

687

interface));

688

}

689

}

690

return -1;

691

}

692

}

693

694

ret = init_gnutls_session(&session, mc);

655

ret = init_gnutls_session(&session);

695

656

if(ret != 0){

696

657

return -1;

697

658

}

698

659

699

660

if(debug){

700

661

fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"

701

PRIuMAX "\n", ip, (uintmax_t)port);

662

PRIu16 "\n", ip, port);

702

663

}

703

664

704

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

735

696

goto mandos_end;

736

697

}

737

698

if(af == AF_INET6){

738

to.in6.sin6_port = htons(port);

699

to.in6.sin6_port = htons(port); /* Spurious warnings from

700

-Wconversion and

701

-Wunreachable-code */

702

739

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

704

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

741

705

-Wunreachable-code*/

765

729

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

766

730

perror_plus("if_indextoname");

767

731

} else {

768

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX

769

"\n", ip, interface, (uintmax_t)port);

732

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16

733

"\n", ip, interface, port);

770

734

}

771

735

} else {

772

fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",

773

ip, (uintmax_t)port);

736

fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",

737

ip, port);

774

738

}

775

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

776

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

854

818

goto mandos_end;

855

819

}

856

820

857

/* This casting via intptr_t is to eliminate warning about casting

858

an int to a pointer type. This is exactly how the GnuTLS Guile

859

function "set-session-transport-fd!" does it. */

860

gnutls_transport_set_ptr(session,

861

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

821

/* Spurious warning from -Wint-to-pointer-cast */

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

862

823

863

824

if(quit_now){

864

825

errno = EINTR;

969

930

if(buffer_length > 0){

970

931

ssize_t decrypted_buffer_size;

971

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

972

&decrypted_buffer, mc);

933

&decrypted_buffer);

973

934

if(decrypted_buffer_size >= 0){

974

935

975

936

written = 0;

1036

997

AVAHI_GCC_UNUSED AvahiStringList *txt,

1037

998

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1038

999

flags,

1039

void* mc){

1040

if(r == NULL){

1041

return;

1042

}

1000

AVAHI_GCC_UNUSED void* userdata){

1001

assert(r);

1043

1002

1044

1003

/* Called whenever a service has been resolved successfully or

1045

1004

timed out */

1054

1013

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

1055

1014

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

1056

1015

domain,

1057

avahi_strerror(avahi_server_errno

1058

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

1016

avahi_strerror(avahi_server_errno(mc.server)));

1059

1017

break;

1060

1018

1061

1019

case AVAHI_RESOLVER_FOUND:

1067

1025

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

1068

1026

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

1069

1027

}

1070

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

1071

interface,

1072

avahi_proto_to_af(proto),

1073

mc);

1028

int ret = start_mandos_communication(ip, port, interface,

1029

avahi_proto_to_af(proto));

1074

1030

if(ret == 0){

1075

avahi_simple_poll_quit(simple_poll);

1031

avahi_simple_poll_quit(mc.simple_poll);

1076

1032

} else {

1077

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

1078

avahi_proto_to_af(proto),

1079

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

1080

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

1081

" list\n", name);

1082

}

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

1083

1035

}

1084

1036

}

1085

1037

}

1095

1047

const char *domain,

1096

1048

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1097

1049

flags,

1098

void* mc){

1099

if(b == NULL){

1100

return;

1101

}

1050

AVAHI_GCC_UNUSED void* userdata){

1051

assert(b);

1102

1052

1103

1053

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

1104

1054

is removed from the LAN */

1112

1062

case AVAHI_BROWSER_FAILURE:

1113

1063

1114

1064

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

1115

avahi_strerror(avahi_server_errno

1116

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

1117

avahi_simple_poll_quit(simple_poll);

1065

avahi_strerror(avahi_server_errno(mc.server)));

1066

avahi_simple_poll_quit(mc.simple_poll);

1118

1067

return;

1119

1068

1120

1069

case AVAHI_BROWSER_NEW:

1123

1072

the callback function is called the Avahi server will free the

1124

1073

resolver for us. */

1125

1074

1126

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

1127

interface, protocol, name, type,

1128

domain, protocol, 0,

1129

resolve_callback, mc) == NULL)

1075

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

1076

name, type, domain, protocol, 0,

1077

resolve_callback, NULL) == NULL)

1130

1078

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

1131

1079

" %s\n", name,

1132

avahi_strerror(avahi_server_errno

1133

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1134

1081

break;

1135

1082

1136

1083

case AVAHI_BROWSER_REMOVE:

1155

1102

signal_received = sig;

1156

1103

int old_errno = errno;

1157

1104

/* set main loop to exit */

1158

if(simple_poll != NULL){

1159

avahi_simple_poll_quit(simple_poll);

1105

if(mc.simple_poll != NULL){

1106

avahi_simple_poll_quit(mc.simple_poll);

1160

1107

}

1161

1108

errno = old_errno;

1162

1109

}

1163

1110

1164

1111

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

1165

1112

int ret;

1166

error_t ret_errno;

1167

1113

1168

1114

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

1169

1115

if(s < 0){

1170

ret_errno = errno;

1171

1116

perror_plus("socket");

1172

errno = ret_errno;

1173

1117

return false;

1174

1118

}

1175

1119

strcpy(ifr->ifr_name, ifname);

1176

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1177

1121

if(ret == -1){

1178

1122

if(debug){

1179

ret_errno = errno;

1180

1123

perror_plus("ioctl SIOCGIFFLAGS");

1181

errno = ret_errno;

1182

1124

}

1183

1125

return false;

1184

1126

}

1253

1195

}

1254

1196

1255

1197

/*

1256

* This function determines if a network interface is up.

1257

*/

1258

bool interface_is_up(const char *interface){

1259

struct ifreq ifr;

1260

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

1261

if(debug){

1262

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

1263

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

1264

}

1265

return false;

1266

}

1267

1268

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

1269

}

1270

1271

/*

1272

* This function determines if a network interface is running

1273

*/

1274

bool interface_is_running(const char *interface){

1275

struct ifreq ifr;

1276

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

1277

if(debug){

1278

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

1279

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

1280

}

1281

return false;

1282

}

1283

1284

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

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1236

}

1237

return 1;

1285

1238

}

1286

1239

1287

1240

int notdotentries(const struct dirent *direntry){

1356

1309

return 1;

1357

1310

}

1358

1311

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

mandos_context *mc){

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1361

1313

int ret;

1362

1314

struct timespec now;

1363

1315

struct timespec waited_time;

1364

1316

intmax_t block_time;

1365

1317

1366

1318

while(true){

1367

if(mc->current_server == NULL){

1319

if(mc.current_server == NULL){

1368

1320

if (debug){

1369

1321

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

1370

1322

" No timeout!\n");

1384

1336

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

1385

1337

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

1386

1338

waited_time.tv_sec = (now.tv_sec

1387

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

1339

- mc.current_server->last_seen.tv_sec);

1388

1340

waited_time.tv_nsec = (now.tv_nsec

1389

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

1341

- mc.current_server->last_seen.tv_nsec);

1390

1342

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

1391

1343

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

1392

1344

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

1400

1352

}

1401

1353

1402

1354

if(block_time <= 0){

1403

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

1404

mc->current_server->port,

1405

mc->current_server->if_index,

1406

mc->current_server->af, mc);

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1407

1359

if(ret == 0){

1408

avahi_simple_poll_quit(s);

1360

avahi_simple_poll_quit(mc.simple_poll);

1409

1361

return 0;

1410

1362

}

1411

1363

ret = clock_gettime(CLOCK_MONOTONIC,

1412

&mc->current_server->last_seen);

1364

&mc.current_server->last_seen);

1413

1365

if(ret == -1){

1414

1366

perror_plus("clock_gettime");

1415

1367

return -1;

1416

1368

}

1417

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

1369

mc.current_server = mc.current_server->next;

1418

1370

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

1419

1371

servers, but don't block */

1420

1372

}

1429

1381

}

1430

1382

}

1431

1383

1432

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

1433

error_t raise_privileges(void){

1434

error_t old_errno = errno;

1435

error_t ret_errno = 0;

1436

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

1437

ret_errno = errno;

1438

perror_plus("seteuid");

1439

}

1440

errno = old_errno;

1441

return ret_errno;

1442

}

1443

1444

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

1445

error_t raise_privileges_permanently(void){

1446

error_t old_errno = errno;

1447

error_t ret_errno = raise_privileges();

1448

if(ret_errno != 0){

1449

errno = old_errno;

1450

return ret_errno;

1451

}

1452

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

1453

ret_errno = errno;

1454

perror_plus("seteuid");

1455

}

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

1460

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

1461

error_t lower_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

/* Lower privileges permanently */

1473

error_t lower_privileges_permanently(void){

1474

error_t old_errno = errno;

1475

error_t ret_errno = 0;

1476

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

1477

ret_errno = errno;

1478

perror_plus("setuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

1384

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

1485

1385

const float delay){

1486

1386

struct dirent **direntries;

1489

1389

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

1490

1390

alphasort);

1491

1391

if(numhooks == -1){

1492

if(errno == ENOENT){

1493

if(debug){

1494

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

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

1499

}

1392

perror_plus("scandir");

1500

1393

} else {

1501

1394

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

1502

1395

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

1515

1408

if(hook_pid == 0){

1516

1409

/* Child */

1517

1410

/* Raise privileges */

1518

raise_privileges_permanently();

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1519

1422

/* Set group */

1520

1423

errno = 0;

1521

1424

ret = setgid(0);

1541

1444

perror_plus("setenv");

1542

1445

_exit(EX_OSERR);

1543

1446

}

1544

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

1447

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

1545

1448

if(ret == -1){

1546

1449

perror_plus("setenv");

1547

1450

_exit(EX_OSERR);

1564

1467

_exit(EX_OSERR);

1565

1468

}

1566

1469

free(delaystring);

1567

if(connect_to != NULL){

1568

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

1569

if(ret == -1){

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1573

}

1574

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

1575

perror_plus("execl");

1576

_exit(EXIT_FAILURE);

1577

}

1470

ret = execl(fullname, direntry->d_name, mode, NULL);

1471

perror_plus("execl");

1578

1472

} else {

1579

1473

int status;

1580

1474

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

1614

1508

return true;

1615

1509

}

1616

1510

1617

error_t bring_up_interface(const char *const interface,

1618

const float delay){

1619

int sd = -1;

1620

error_t old_errno = errno;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1623

struct ifreq network;

1624

unsigned int if_index = if_nametoindex(interface);

1625

if(if_index == 0){

1626

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

1627

errno = old_errno;

1628

return ENXIO;

1629

}

1630

1631

if(quit_now){

1632

errno = old_errno;

1633

return EINTR;

1634

}

1635

1636

if(not interface_is_up(interface)){

1637

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

1638

ret_errno = errno;

1639

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

1640

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

1641

return ret_errno;

1642

}

1643

network.ifr_flags |= IFF_UP;

1644

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1647

ret_errno = errno;

1648

perror_plus("socket");

1649

errno = old_errno;

1650

return ret_errno;

1651

}

1652

1653

if(quit_now){

1654

close(sd);

1655

errno = old_errno;

1656

return EINTR;

1657

}

1658

1659

if(debug){

1660

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

1661

interface);

1662

}

1663

1664

/* Raise priviliges */

1665

raise_privileges();

1666

1667

#ifdef __linux__

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

1675

}

1676

#endif /* __linux__ */

1677

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

1678

ret_errno = errno;

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret_linux = klogctl(7, NULL, 0);

1682

if(ret_linux == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

1688

/* Lower privileges */

1689

lower_privileges();

1690

1691

/* Close the socket */

1692

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

1693

if(ret == -1){

1694

perror_plus("close");

1695

}

1696

1697

if(ret_setflags == -1){

1698

errno = ret_errno;

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1700

errno = old_errno;

1701

return ret_errno;

1702

}

1703

} else if(debug){

1704

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

1705

interface);

1706

}

1707

1708

/* Sleep checking until interface is running.

1709

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

1710

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

1711

if(interface_is_running(interface)){

1712

break;

1713

}

1714

struct timespec sleeptime = { .tv_nsec = 250000000 };

1715

ret = nanosleep(&sleeptime, NULL);

1716

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

1717

perror_plus("nanosleep");

1718

}

1719

}

1720

1721

errno = old_errno;

1722

return 0;

1723

}

1724

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1730

struct ifreq network;

1731

unsigned int if_index = if_nametoindex(interface);

1732

if(if_index == 0){

1733

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

1734

errno = old_errno;

1735

return ENXIO;

1736

}

1737

if(interface_is_up(interface)){

1738

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

1739

ret_errno = errno;

1740

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

1741

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

1742

return ret_errno;

1743

}

1744

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

1745

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1748

ret_errno = errno;

1749

perror_plus("socket");

1750

errno = old_errno;

1751

return ret_errno;

1752

}

1753

1754

if(debug){

1755

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

1756

interface);

1757

}

1758

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

1767

1768

/* Close the socket */

1769

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

1770

if(ret == -1){

1771

perror_plus("close");

1772

}

1773

1774

if(ret_setflags == -1){

1775

errno = ret_errno;

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1777

errno = old_errno;

1778

return ret_errno;

1779

}

1780

} else if(debug){

1781

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

1782

interface);

1783

}

1784

1785

errno = old_errno;

1786

return 0;

1787

}

1788

1789

1511

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

1790

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

1791

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

1792

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

1793

.interfaces = NULL, .interfaces_size = 0 };

1794

1512

AvahiSServiceBrowser *sb = NULL;

1795

error_t ret_errno;

1513

int error;

1796

1514

int ret;

1797

1515

intmax_t tmpmax;

1798

1516

char *tmp;

1799

1517

int exitcode = EXIT_SUCCESS;

1800

char *interfaces_to_take_down = NULL;

1801

size_t interfaces_to_take_down_size = 0;

1518

const char *interface = "";

1519

struct ifreq network;

1520

int sd = -1;

1521

bool take_down_interface = false;

1522

uid_t uid;

1523

gid_t gid;

1802

1524

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

1803

1525

bool tempdir_created = false;

1804

1526

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1805

1527

const char *seckey = PATHDIR "/" SECKEY;

1806

1528

const char *pubkey = PATHDIR "/" PUBKEY;

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1809

1529

1810

1530

bool gnutls_initialized = false;

1811

1531

bool gpgme_initialized = false;

1873

1593

.group = 2 },

1874

1594

{ .name = "retry", .key = 132,

1875

1595

.arg = "SECONDS",

1876

.doc = "Retry interval used when denied by the Mandos server",

1596

.doc = "Retry interval used when denied by the mandos server",

1877

1597

.group = 2 },

1878

1598

{ .name = "network-hook-dir", .key = 133,

1879

1599

.arg = "DIR",

1902

1622

connect_to = arg;

1903

1623

break;

1904

1624

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

1905

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

1906

arg, (int)',');

1907

if(ret_errno != 0){

1908

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

1909

}

1625

interface = arg;

1910

1626

break;

1911

1627

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

1912

1628

seckey = arg;

1955

1671

argp_state_help(state, state->out_stream,

1956

1672

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1957

1673

case 'V': /* --version */

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1958

1676

fprintf_plus(state->out_stream, "%s\n", argp_program_version);

1959

1677

exit(argp_err_exit_status);

1960

1678

break;

1990

1708

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

1991

1709

1992

1710

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

1715

} else {

1994

1716

struct stat st;

1995

1717

1996

1718

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

2036

1758

}

2037

1759

2038

1760

/* Lower privileges */

2039

lower_privileges();

2040

}

2041

}

2042

2043

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

2044

{

2045

char *interface = NULL;

2046

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

2047

interface))){

2048

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

2049

and if_nametoindex(interface) == 0){

2050

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

2051

fprintf_plus(stderr, "Not using nonexisting interface"

2052

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

2053

}

2054

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

2055

interface = NULL;

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

2056

1765

}

2057

1766

}

2058

1767

}

2059

1768

2060

1769

/* Run network hooks */

2061

{

2062

if(mc.interfaces != NULL){

2063

interfaces_hooks = malloc(mc.interfaces_size);

2064

if(interfaces_hooks == NULL){

2065

perror_plus("malloc");

2066

goto end;

2067

}

2068

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

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

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

2074

interfaces_hooks : "", delay)){

2075

goto end;

2076

}

1770

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

1771

goto end;

2077

1772

}

2078

1773

2079

1774

if(not debug){

2080

1775

avahi_set_log_function(empty_log);

2081

1776

}

2082

1777

1778

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

1779

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

if(ret >= 1){

1790

/* Pick the first interface returned */

1791

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

1792

if(debug){

1793

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

1794

}

1795

if(interface == NULL){

1796

perror_plus("malloc");

1797

free(direntries);

1798

exitcode = EXIT_FAILURE;

1799

goto end;

1800

}

1801

free(direntries);

1802

} else {

1803

free(direntries);

1804

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

1805

exitcode = EXIT_FAILURE;

1806

goto end;

1807

}

1808

}

1809

2083

1810

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

2084

1811

from the signal handler */

2085

1812

/* Initialize the pseudo-RNG for Avahi */

2086

1813

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

2087

simple_poll = avahi_simple_poll_new();

2088

if(simple_poll == NULL){

1814

mc.simple_poll = avahi_simple_poll_new();

1815

if(mc.simple_poll == NULL){

2089

1816

fprintf_plus(stderr,

2090

1817

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

2091

1818

exitcode = EX_UNAVAILABLE;

2155

1882

}

2156

1883

}

2157

1884

2158

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

2159

if(mc.interfaces == NULL){

2160

struct dirent **direntries;

2161

/* Look for any good interfaces */

2162

ret = scandir(sys_class_net, &direntries, good_interface,

2163

alphasort);

2164

if(ret >= 1){

2165

/* Add all found interfaces to interfaces list */

2166

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

2167

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

2168

direntries[i]->d_name);

2169

if(ret_errno != 0){

2170

perror_plus("argz_add");

2171

continue;

2172

}

2173

if(debug){

2174

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

2175

direntries[i]->d_name);

2176

}

2177

}

2178

free(direntries);

2179

} else {

2180

free(direntries);

2181

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

2182

exitcode = EXIT_FAILURE;

2183

goto end;

2184

}

2185

}

2186

2187

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

2188

{

2189

char *interface = NULL;

2190

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

2191

interface))){

2192

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

2193

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

2194

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

2195

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

2196

interface);

2197

interface = NULL;

2198

while((interface = argz_next(mc.interfaces,

2199

mc.interfaces_size, interface))){

2200

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

2201

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

2202

interface);

2203

interface = NULL;

1885

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

1886

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

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1888

if(if_index == 0){

1889

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

1890

exitcode = EX_UNAVAILABLE;

1891

goto end;

1892

}

1893

1894

if(quit_now){

1895

goto end;

1896

}

1897

1898

/* Re-raise priviliges */

1899

errno = 0;

1900

ret = seteuid(0);

1901

if(ret == -1){

1902

perror_plus("seteuid");

1903

}

1904

1905

#ifdef __linux__

1906

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1907

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

1908

ret = klogctl(8, NULL, 5);

1909

bool restore_loglevel = true;

1910

if(ret == -1){

1911

restore_loglevel = false;

1912

perror_plus("klogctl");

1913

}

1914

#endif /* __linux__ */

1915

1916

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1917

if(sd < 0){

1918

perror_plus("socket");

1919

exitcode = EX_OSERR;

1920

#ifdef __linux__

1921

if(restore_loglevel){

1922

ret = klogctl(7, NULL, 0);

1923

if(ret == -1){

1924

perror_plus("klogctl");

1925

}

1926

}

1927

#endif /* __linux__ */

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1934

goto end;

1935

}

1936

strcpy(network.ifr_name, interface);

1937

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

1938

if(ret == -1){

1939

perror_plus("ioctl SIOCGIFFLAGS");

1940

#ifdef __linux__

1941

if(restore_loglevel){

1942

ret = klogctl(7, NULL, 0);

1943

if(ret == -1){

1944

perror_plus("klogctl");

1945

}

1946

}

1947

#endif /* __linux__ */

1948

exitcode = EX_OSERR;

1949

/* Lower privileges */

1950

errno = 0;

1951

ret = seteuid(uid);

1952

if(ret == -1){

1953

perror_plus("seteuid");

1954

}

1955

goto end;

1956

}

1957

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

1958

network.ifr_flags |= IFF_UP;

1959

take_down_interface = true;

1960

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

1961

if(ret == -1){

1962

take_down_interface = false;

1963

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1964

exitcode = EX_OSERR;

1965

#ifdef __linux__

1966

if(restore_loglevel){

1967

ret = klogctl(7, NULL, 0);

1968

if(ret == -1){

1969

perror_plus("klogctl");

2204

1970

}

2205

1971

}

1972

#endif /* __linux__ */

1973

/* Lower privileges */

1974

errno = 0;

1975

ret = seteuid(uid);

1976

if(ret == -1){

1977

perror_plus("seteuid");

1978

}

1979

goto end;

1980

}

1981

}

1982

/* Sleep checking until interface is running.

1983

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

1984

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

1985

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

1986

if(ret == -1){

1987

perror_plus("ioctl SIOCGIFFLAGS");

1988

} else if(network.ifr_flags & IFF_RUNNING){

2206

1989

break;

2207

1990

}

2208

bool interface_was_up = interface_is_up(interface);

2209

ret = bring_up_interface(interface, delay);

2210

if(not interface_was_up){

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2214

} else {

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2218

}

2219

}

2220

}

2221

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

2222

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

2223

}

2224

}

2225

2226

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

2227

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

2228

if(debug){

2229

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

2230

mc.interfaces);

2231

}

2232

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

1991

struct timespec sleeptime = { .tv_nsec = 250000000 };

1992

ret = nanosleep(&sleeptime, NULL);

1993

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

1994

perror_plus("nanosleep");

1995

}

1996

}

1997

if(not take_down_interface){

1998

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

1999

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

2000

if(ret == -1){

2001

perror_plus("close");

2002

}

2003

}

2004

#ifdef __linux__

2005

if(restore_loglevel){

2006

/* Restores kernel loglevel to default */

2007

ret = klogctl(7, NULL, 0);

2008

if(ret == -1){

2009

perror_plus("klogctl");

2010

}

2011

}

2012

#endif /* __linux__ */

2013

/* Lower privileges */

2014

errno = 0;

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

2019

}

2233

2020

}

2234

2021

2235

2022

if(quit_now){

2236

2023

goto end;

2237

2024

}

2238

2025

2239

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

2026

ret = init_gnutls_global(pubkey, seckey);

2240

2027

if(ret == -1){

2241

2028

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

2242

2029

exitcode = EX_UNAVAILABLE;

2259

2046

goto end;

2260

2047

}

2261

2048

2262

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

2049

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

2263

2050

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

2264

2051

exitcode = EX_UNAVAILABLE;

2265

2052

goto end;

2275

2062

/* Connect directly, do not use Zeroconf */

2276

2063

/* (Mainly meant for debugging) */

2277

2064

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

2278

2279

2065

if(address == NULL){

2280

2066

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

2281

2067

exitcode = EX_USAGE;

2286

2072

goto end;

2287

2073

}

2288

2074

2289

in_port_t port;

2075

uint16_t port;

2290

2076

errno = 0;

2291

2077

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

2292

2078

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

2293

or tmpmax != (in_port_t)tmpmax){

2079

or tmpmax != (uint16_t)tmpmax){

2294

2080

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

2295

2081

exitcode = EX_USAGE;

2296

2082

goto end;

2297

2083

}

2298

2084

2299

2085

if(quit_now){

2300

2086

goto end;

2301

2087

}

2302

2088

2303

port = (in_port_t)tmpmax;

2089

port = (uint16_t)tmpmax;

2304

2090

*address = '\0';

2305

2091

/* Colon in address indicates IPv6 */

2306

2092

int af;

2322

2108

}

2323

2109

2324

2110

while(not quit_now){

2325

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

2326

&mc);

2111

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

2327

2112

if(quit_now or ret == 0){

2328

2113

break;

2329

2114

}

2331

2116

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

2332

2117

(int)retry_interval);

2333

2118

}

2334

sleep((unsigned int)retry_interval);

2119

sleep((int)retry_interval);

2335

2120

}

2336

2121

2337

2122

if (not quit_now){

2355

2140

config.publish_domain = 0;

2356

2141

2357

2142

/* Allocate a new server */

2358

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2359

&config, NULL, NULL, &ret_errno);

2143

mc.server = avahi_server_new(avahi_simple_poll_get

2144

(mc.simple_poll), &config, NULL,

2145

NULL, &error);

2360

2146

2361

2147

/* Free the Avahi configuration data */

2362

2148

avahi_server_config_free(&config);

2365

2151

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

2366

2152

if(mc.server == NULL){

2367

2153

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

2368

avahi_strerror(ret_errno));

2154

avahi_strerror(error));

2369

2155

exitcode = EX_UNAVAILABLE;

2370

2156

goto end;

2371

2157

}

2377

2163

/* Create the Avahi service browser */

2378

2164

sb = avahi_s_service_browser_new(mc.server, if_index,

2379

2165

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2380

NULL, 0, browse_callback,

2381

(void *)&mc);

2166

NULL, 0, browse_callback, NULL);

2382

2167

if(sb == NULL){

2383

2168

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

2384

2169

avahi_strerror(avahi_server_errno(mc.server)));

2396

2181

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

2397

2182

}

2398

2183

2399

ret = avahi_loop_with_timeout(simple_poll,

2400

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

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2401

2186

if(debug){

2402

2187

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

2403

2188

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

2410

2195

}

2411

2196

2412

2197

/* Cleanup things */

2413

free(mc.interfaces);

2414

2415

2198

if(sb != NULL)

2416

2199

avahi_s_service_browser_free(sb);

2417

2200

2418

2201

if(mc.server != NULL)

2419

2202

avahi_server_free(mc.server);

2420

2203

2421

if(simple_poll != NULL)

2422

avahi_simple_poll_free(simple_poll);

2204

if(mc.simple_poll != NULL)

2205

avahi_simple_poll_free(mc.simple_poll);

2423

2206

2424

2207

if(gnutls_initialized){

2425

2208

gnutls_certificate_free_credentials(mc.cred);

2442

2225

}

2443

2226

}

2444

2227

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2445

2231

/* Re-raise priviliges */

2446

2232

{

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

2233

errno = 0;

2234

ret = seteuid(0);

2235

if(ret == -1){

2236

perror_plus("seteuid");

2237

}

2238

2239

/* Take down the network interface */

2240

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

2241

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

2242

if(ret == -1){

2243

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

2245

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

2246

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

2247

if(ret == -1){

2248

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2463

2249

}

2464

2250

}

2465

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

2466

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

2467

" down\n");

2251

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

2252

if(ret == -1){

2253

perror_plus("close");

2468

2254

}

2469

2255

}

2470

2471

lower_privileges_permanently();

2472

}

2473

2474

free(interfaces_to_take_down);

2475

free(interfaces_hooks);

2256

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2476

2263

2477

2264

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

2478

2265

if(tempdir_created){