/mandos/release : revision 237.7.216

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() */

58

inet_pton(), connect(),

59

getnameinfo() */

59

60

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

60

61

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

61

62

*/

62

63

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

63

64

strtoimax() */

64

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

65

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

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program_invocation_short_name */

67

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

74

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

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

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

77

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

77

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

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

79

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

80

argp_state, struct argp,

88

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

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WEXITSTATUS(), WTERMSIG() */

90

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

91

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

92

argz_delete(), argz_append(),

93

argz_stringify(), argz_add(),

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argz_count() */

95

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

96

EAI_SYSTEM, gai_strerror() */

91

97

92

98

#ifdef __linux__

93

99

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

141

147

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

142

148

typedef struct server{

143

149

const char *ip;

144

uint16_t port;

150

in_port_t port;

145

151

AvahiIfIndex if_index;

146

152

int af;

147

153

struct timespec last_seen;

151

157

152

158

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

153

159

typedef struct {

154

AvahiSimplePoll *simple_poll;

155

160

AvahiServer *server;

156

161

gnutls_certificate_credentials_t cred;

157

162

unsigned int dh_bits;

159

164

const char *priority;

160

165

gpgme_ctx_t ctx;

161

166

server *current_server;

167

char *interfaces;

168

size_t interfaces_size;

162

169

} mandos_context;

163

170

164

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

165

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

166

.dh_bits = 1024, .priority = "SECURE256"

167

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

168

.current_server = NULL };

171

/* global so signal handler can reach it*/

172

AvahiSimplePoll *simple_poll;

169

173

170

174

sig_atomic_t quit_now = 0;

171

175

int signal_received = 0;

186

190

187

191

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

188

192

program_invocation_short_name));

189

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

193

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

190

194

}

191

195

192

196

/*

197

201

size_t incbuffer(char **buffer, size_t buffer_length,

198

202

size_t buffer_capacity){

199

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

200

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

201

if(buffer == NULL){

204

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

205

if(new_buf == NULL){

206

int old_errno = errno;

207

free(*buffer);

208

errno = old_errno;

209

*buffer = NULL;

202

210

return 0;

203

211

}

212

*buffer = new_buf;

204

213

buffer_capacity += BUFFER_SIZE;

205

214

}

206

215

return buffer_capacity;

207

216

}

208

217

209

218

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

210

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

211

int af){

219

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

220

int af, server **current_server){

212

221

int ret;

213

222

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

214

223

if(new_server == NULL){

223

232

perror_plus("strdup");

224

233

return false;

225

234

}

235

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

236

if(ret == -1){

237

perror_plus("clock_gettime");

238

return false;

239

}

226

240

/* Special case of first server */

227

if (mc.current_server == NULL){

241

if(*current_server == NULL){

228

242

new_server->next = new_server;

229

243

new_server->prev = new_server;

230

mc.current_server = new_server;

244

*current_server = new_server;

231

245

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

232

246

} else {

233

new_server->next = mc.current_server;

234

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

247

new_server->next = *current_server;

248

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

235

249

new_server->prev->next = new_server;

236

mc.current_server->prev = new_server;

237

}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

250

(*current_server)->prev = new_server;

242

251

}

243

252

return true;

244

253

}

247

256

* Initialize GPGME.

248

257

*/

249

258

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

250

const char *tempdir){

259

const char *tempdir, mandos_context *mc){

251

260

gpgme_error_t rc;

252

261

gpgme_engine_info_t engine_info;

253

262

254

255

263

/*

256

264

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

257

265

*/

273

281

return false;

274

282

}

275

283

276

rc = gpgme_op_import(mc.ctx, pgp_data);

284

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

277

285

if(rc != GPG_ERR_NO_ERROR){

278

286

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

279

287

gpgme_strsource(rc), gpgme_strerror(rc));

323

331

}

324

332

325

333

/* Create new GPGME "context" */

326

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

334

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

327

335

if(rc != GPG_ERR_NO_ERROR){

328

336

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

329

337

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

344

352

*/

345

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

354

size_t crypto_size,

347

char **plaintext){

355

char **plaintext,

356

mandos_context *mc){

348

357

gpgme_data_t dh_crypto, dh_plain;

349

358

gpgme_error_t rc;

350

359

ssize_t ret;

376

385

377

386

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

378

387

data buffer */

379

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

388

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

380

389

if(rc != GPG_ERR_NO_ERROR){

381

390

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

382

391

gpgme_strsource(rc), gpgme_strerror(rc));

383

392

plaintext_length = -1;

384

393

if(debug){

385

394

gpgme_decrypt_result_t result;

386

result = gpgme_op_decrypt_result(mc.ctx);

395

result = gpgme_op_decrypt_result(mc->ctx);

387

396

if(result == NULL){

388

397

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

389

398

} else {

467

476

}

468

477

469

478

static const char * safer_gnutls_strerror(int value){

470

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

471

-Wunreachable-code */

479

const char *ret = gnutls_strerror(value);

472

480

if(ret == NULL)

473

481

ret = "(unknown)";

474

482

return ret;

481

489

}

482

490

483

491

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename){

492

const char *seckeyfilename,

493

mandos_context *mc){

485

494

int ret;

486

495

487

496

if(debug){

504

513

}

505

514

506

515

/* OpenPGP credentials */

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

516

ret = gnutls_certificate_allocate_credentials(&mc->cred);

508

517

if(ret != GNUTLS_E_SUCCESS){

509

518

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

510

519

safer_gnutls_strerror(ret));

520

529

}

521

530

522

531

ret = gnutls_certificate_set_openpgp_key_file

523

(mc.cred, pubkeyfilename, seckeyfilename,

532

(mc->cred, pubkeyfilename, seckeyfilename,

524

533

GNUTLS_OPENPGP_FMT_BASE64);

525

534

if(ret != GNUTLS_E_SUCCESS){

526

535

fprintf_plus(stderr,

532

541

}

533

542

534

543

/* GnuTLS server initialization */

535

ret = gnutls_dh_params_init(&mc.dh_params);

544

ret = gnutls_dh_params_init(&mc->dh_params);

536

545

if(ret != GNUTLS_E_SUCCESS){

537

546

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

547

" initialization: %s\n",

539

548

safer_gnutls_strerror(ret));

540

549

goto globalfail;

541

550

}

542

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

551

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

543

552

if(ret != GNUTLS_E_SUCCESS){

544

553

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

545

554

safer_gnutls_strerror(ret));

546

555

goto globalfail;

547

556

}

548

557

549

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

558

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

550

559

551

560

return 0;

552

561

553

562

globalfail:

554

563

555

gnutls_certificate_free_credentials(mc.cred);

564

gnutls_certificate_free_credentials(mc->cred);

556

565

gnutls_global_deinit();

557

gnutls_dh_params_deinit(mc.dh_params);

566

gnutls_dh_params_deinit(mc->dh_params);

558

567

return -1;

559

568

}

560

569

561

static int init_gnutls_session(gnutls_session_t *session){

570

static int init_gnutls_session(gnutls_session_t *session,

571

mandos_context *mc){

562

572

int ret;

563

573

/* GnuTLS session creation */

564

574

do {

576

586

{

577

587

const char *err;

578

588

do {

579

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

589

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

580

590

if(quit_now){

581

591

gnutls_deinit(*session);

582

592

return -1;

593

603

594

604

do {

595

605

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

596

mc.cred);

606

mc->cred);

597

607

if(quit_now){

598

608

gnutls_deinit(*session);

599

609

return -1;

609

619

/* ignore client certificate if any. */

610

620

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

611

621

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

613

623

614

624

return 0;

615

625

}

619

629

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

620

630

621

631

/* Called when a Mandos server is found */

622

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

632

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

623

633

AvahiIfIndex if_index,

624

int af){

634

int af, mandos_context *mc){

625

635

int ret, tcp_sd = -1;

626

636

ssize_t sret;

627

637

union {

657

667

return -1;

658

668

}

659

669

660

ret = init_gnutls_session(&session);

670

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

671

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

672

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

673

bool match = false;

674

{

675

char *interface = NULL;

676

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

677

interface))){

678

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

679

match = true;

680

break;

681

}

682

}

683

}

684

if(not match){

685

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

686

connect to the server */

687

if(debug){

688

char interface[IF_NAMESIZE];

689

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

690

perror_plus("if_indextoname");

691

} else {

692

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

693

" \"%s\"\n",

694

if_indextoname((unsigned int)if_index,

695

interface));

696

}

697

}

698

return -1;

699

}

700

}

701

702

ret = init_gnutls_session(&session, mc);

661

703

if(ret != 0){

662

704

return -1;

663

705

}

664

706

665

707

if(debug){

666

708

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

667

PRIu16 "\n", ip, port);

709

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

668

710

}

669

711

670

712

tcp_sd = socket(pf, SOCK_STREAM, 0);

701

743

goto mandos_end;

702

744

}

703

745

if(af == AF_INET6){

704

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

705

-Wconversion and

706

-Wunreachable-code */

707

746

to.in6.sin6_port = htons(port);

747

#ifdef __GNUC__

748

#pragma GCC diagnostic push

749

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

750

#endif

708

751

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

709

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

710

-Wunreachable-code*/

752

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

753

#ifdef __GNUC__

754

#pragma GCC diagnostic pop

755

#endif

711

756

if(if_index == AVAHI_IF_UNSPEC){

712

757

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

713

758

" incomplete without a network interface\n");

718

763

to.in6.sin6_scope_id = (uint32_t)if_index;

719

764

}

720

765

} else {

721

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

722

-Wconversion and

723

-Wunreachable-code */

766

to.in.sin_port = htons(port);

724

767

}

725

768

726

769

if(quit_now){

734

777

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

735

778

perror_plus("if_indextoname");

736

779

} else {

737

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

738

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

780

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

781

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

739

782

}

740

783

} else {

741

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

742

ip, port);

784

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

785

ip, (uintmax_t)port);

743

786

}

744

787

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

745

788

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

746

const char *pcret;

747

789

if(af == AF_INET6){

748

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

749

sizeof(addrstr));

790

ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),

791

addrstr, sizeof(addrstr), NULL, 0,

792

NI_NUMERICHOST);

750

793

} else {

751

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

752

sizeof(addrstr));

794

ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

753

797

}

754

if(pcret == NULL){

755

perror_plus("inet_ntop");

756

} else {

757

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

758

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

759

}

798

if(ret == EAI_SYSTEM){

799

perror_plus("getnameinfo");

800

} else if(ret != 0) {

801

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

802

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

803

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

760

804

}

761

805

}

762

806

938

982

if(buffer_length > 0){

939

983

ssize_t decrypted_buffer_size;

940

984

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

941

&decrypted_buffer);

985

&decrypted_buffer, mc);

942

986

if(decrypted_buffer_size >= 0){

943

987

944

988

written = 0;

1005

1049

AVAHI_GCC_UNUSED AvahiStringList *txt,

1006

1050

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1007

1051

flags,

1008

AVAHI_GCC_UNUSED void* userdata){

1009

assert(r);

1052

void* mc){

1053

if(r == NULL){

1054

return;

1055

}

1010

1056

1011

1057

/* Called whenever a service has been resolved successfully or

1012

1058

timed out */

1021

1067

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

1022

1068

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

1023

1069

domain,

1024

avahi_strerror(avahi_server_errno(mc.server)));

1070

avahi_strerror(avahi_server_errno

1071

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

1025

1072

break;

1026

1073

1027

1074

case AVAHI_RESOLVER_FOUND:

1033

1080

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

1034

1081

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

1035

1082

}

1036

int ret = start_mandos_communication(ip, port, interface,

1037

avahi_proto_to_af(proto));

1083

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

1084

interface,

1085

avahi_proto_to_af(proto),

1086

mc);

1038

1087

if(ret == 0){

1039

avahi_simple_poll_quit(mc.simple_poll);

1088

avahi_simple_poll_quit(simple_poll);

1040

1089

} else {

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1090

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

1091

avahi_proto_to_af(proto),

1092

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

1043

1093

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

1044

1094

" list\n", name);

1045

1095

}

1058

1108

const char *domain,

1059

1109

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1060

1110

flags,

1061

AVAHI_GCC_UNUSED void* userdata){

1062

assert(b);

1111

void* mc){

1112

if(b == NULL){

1113

return;

1114

}

1063

1115

1064

1116

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

1065

1117

is removed from the LAN */

1073

1125

case AVAHI_BROWSER_FAILURE:

1074

1126

1075

1127

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

1076

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_simple_poll_quit(mc.simple_poll);

1128

avahi_strerror(avahi_server_errno

1129

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

1130

avahi_simple_poll_quit(simple_poll);

1078

1131

return;

1079

1132

1080

1133

case AVAHI_BROWSER_NEW:

1083

1136

the callback function is called the Avahi server will free the

1084

1137

resolver for us. */

1085

1138

1086

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

1087

name, type, domain, protocol, 0,

1088

resolve_callback, NULL) == NULL)

1139

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

1140

interface, protocol, name, type,

1141

domain, protocol, 0,

1142

resolve_callback, mc) == NULL)

1089

1143

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

1090

1144

" %s\n", name,

1091

avahi_strerror(avahi_server_errno(mc.server)));

1145

avahi_strerror(avahi_server_errno

1146

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

1092

1147

break;

1093

1148

1094

1149

case AVAHI_BROWSER_REMOVE:

1113

1168

signal_received = sig;

1114

1169

int old_errno = errno;

1115

1170

/* set main loop to exit */

1116

if(mc.simple_poll != NULL){

1117

avahi_simple_poll_quit(mc.simple_poll);

1171

if(simple_poll != NULL){

1172

avahi_simple_poll_quit(simple_poll);

1118

1173

}

1119

1174

errno = old_errno;

1120

1175

}

1121

1176

1122

1177

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

1123

1178

int ret;

1179

error_t ret_errno;

1124

1180

1125

1181

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

1126

1182

if(s < 0){

1183

ret_errno = errno;

1127

1184

perror_plus("socket");

1185

errno = ret_errno;

1128

1186

return false;

1129

1187

}

1130

1188

strcpy(ifr->ifr_name, ifname);

1131

1189

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1132

1190

if(ret == -1){

1133

1191

if(debug){

1192

ret_errno = errno;

1134

1193

perror_plus("ioctl SIOCGIFFLAGS");

1194

errno = ret_errno;

1135

1195

}

1136

1196

return false;

1137

1197

}

1206

1266

}

1207

1267

1208

1268

/*

1209

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

1210

* corresponds to an acceptable network device which is up.

1211

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

1212

*/

1213

int up_interface(const struct dirent *if_entry){

1214

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

1215

return 0;

1216

}

1217

1218

struct ifreq ifr;

1219

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

1220

if(debug){

1221

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

1222

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

1223

}

1224

return 0;

1225

}

1226

1227

/* Reject down interfaces */

1228

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

1229

if(debug){

1230

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

1231

if_entry->d_name);

1232

}

1233

return 0;

1234

}

1235

1236

/* Reject non-running interfaces */

1237

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

1238

if(debug){

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

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

1246

return 0;

1247

}

1248

return 1;

1269

* This function determines if a network interface is up.

1270

*/

1271

bool interface_is_up(const char *interface){

1272

struct ifreq ifr;

1273

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

1274

if(debug){

1275

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

1276

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

1277

}

1278

return false;

1279

}

1280

1281

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

1282

}

1283

1284

/*

1285

* This function determines if a network interface is running

1286

*/

1287

bool interface_is_running(const char *interface){

1288

struct ifreq ifr;

1289

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

1290

if(debug){

1291

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

1292

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

1293

}

1294

return false;

1295

}

1296

1297

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

1249

1298

}

1250

1299

1251

1300

int notdotentries(const struct dirent *direntry){

1320

1369

return 1;

1321

1370

}

1322

1371

1323

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1372

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1373

mandos_context *mc){

1324

1374

int ret;

1325

1375

struct timespec now;

1326

1376

struct timespec waited_time;

1327

1377

intmax_t block_time;

1328

1378

1329

1379

while(true){

1330

if(mc.current_server == NULL){

1380

if(mc->current_server == NULL){

1331

1381

if (debug){

1332

1382

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

1333

1383

" No timeout!\n");

1347

1397

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

1348

1398

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

1349

1399

waited_time.tv_sec = (now.tv_sec

1350

- mc.current_server->last_seen.tv_sec);

1400

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

1351

1401

waited_time.tv_nsec = (now.tv_nsec

1352

- mc.current_server->last_seen.tv_nsec);

1402

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

1353

1403

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

1354

1404

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

1355

1405

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

1363

1413

}

1364

1414

1365

1415

if(block_time <= 0){

1366

ret = start_mandos_communication(mc.current_server->ip,

1367

mc.current_server->port,

1368

mc.current_server->if_index,

1369

mc.current_server->af);

1416

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

1417

mc->current_server->port,

1418

mc->current_server->if_index,

1419

mc->current_server->af, mc);

1370

1420

if(ret == 0){

1371

avahi_simple_poll_quit(mc.simple_poll);

1421

avahi_simple_poll_quit(s);

1372

1422

return 0;

1373

1423

}

1374

1424

ret = clock_gettime(CLOCK_MONOTONIC,

1375

&mc.current_server->last_seen);

1425

&mc->current_server->last_seen);

1376

1426

if(ret == -1){

1377

1427

perror_plus("clock_gettime");

1378

1428

return -1;

1379

1429

}

1380

mc.current_server = mc.current_server->next;

1430

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

1381

1431

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

1382

1432

servers, but don't block */

1383

1433

}

1393

1443

}

1394

1444

1395

1445

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

1396

int raise_privileges(void){

1397

int old_errno = errno;

1398

int ret_errno = 0;

1399

errno = 0;

1446

error_t raise_privileges(void){

1447

error_t old_errno = errno;

1448

error_t ret_errno = 0;

1400

1449

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

1450

ret_errno = errno;

1401

1451

perror_plus("seteuid");

1402

1452

}

1403

ret_errno = errno;

1404

1453

errno = old_errno;

1405

1454

return ret_errno;

1406

1455

}

1407

1456

1408

1457

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

1409

int raise_privileges_permanently(void){

1410

int old_errno = errno;

1411

int ret_errno = raise_privileges();

1458

error_t raise_privileges_permanently(void){

1459

error_t old_errno = errno;

1460

error_t ret_errno = raise_privileges();

1412

1461

if(ret_errno != 0){

1413

1462

errno = old_errno;

1414

1463

return ret_errno;

1415

1464

}

1416

errno = 0;

1417

1465

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

1466

ret_errno = errno;

1418

1467

perror_plus("seteuid");

1419

1468

}

1420

ret_errno = errno;

1421

1469

errno = old_errno;

1422

1470

return ret_errno;

1423

1471

}

1424

1472

1425

1473

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

1426

int lower_privileges(void){

1427

int old_errno = errno;

1428

int ret_errno = 0;

1429

errno = 0;

1474

error_t lower_privileges(void){

1475

error_t old_errno = errno;

1476

error_t ret_errno = 0;

1430

1477

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

1478

ret_errno = errno;

1431

1479

perror_plus("seteuid");

1432

1480

}

1433

ret_errno = errno;

1481

errno = old_errno;

1482

return ret_errno;

1483

}

1484

1485

/* Lower privileges permanently */

1486

error_t lower_privileges_permanently(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("setuid");

1492

}

1434

1493

errno = old_errno;

1435

1494

return ret_errno;

1436

1495

}

1438

1497

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

1439

1498

const float delay){

1440

1499

struct dirent **direntries;

1441

struct dirent *direntry;

1442

int ret;

1443

1500

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

1444

1501

alphasort);

1445

1502

if(numhooks == -1){

1446

perror_plus("scandir");

1503

if(errno == ENOENT){

1504

if(debug){

1505

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

1506

" found\n", hookdir);

1507

}

1508

} else {

1509

perror_plus("scandir");

1510

}

1447

1511

} else {

1512

struct dirent *direntry;

1513

int ret;

1448

1514

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

1449

1515

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

1450

1516

direntry = direntries[i];

1561

1627

return true;

1562

1628

}

1563

1629

1564

int bring_up_interface(const char * const interface, const float delay){

1630

error_t bring_up_interface(const char *const interface,

1631

const float delay){

1565

1632

int sd = -1;

1566

int ret;

1633

error_t old_errno = errno;

1634

error_t ret_errno = 0;

1635

int ret, ret_setflags;

1567

1636

struct ifreq network;

1568

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1637

unsigned int if_index = if_nametoindex(interface);

1569

1638

if(if_index == 0){

1570

1639

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

1571

return EX_UNAVAILABLE;

1640

errno = old_errno;

1641

return ENXIO;

1572

1642

}

1573

1643

1574

1644

if(quit_now){

1645

errno = old_errno;

1575

1646

return EINTR;

1576

1647

}

1577

1648

1578

/* Re-raise priviliges */

1579

raise_privileges();

1580

1581

#ifdef __linux__

1582

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1583

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

1584

ret = klogctl(8, NULL, 5);

1585

bool restore_loglevel = true;

1586

if(ret == -1){

1587

restore_loglevel = false;

1588

perror_plus("klogctl");

1589

}

1590

#endif /* __linux__ */

1591

1592

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1593

if(sd < 0){

1594

perror_plus("socket");

1595

#ifdef __linux__

1596

if(restore_loglevel){

1597

ret = klogctl(7, NULL, 0);

1598

if(ret == -1){

1599

perror_plus("klogctl");

1600

}

1601

}

1602

#endif /* __linux__ */

1603

/* Lower privileges */

1604

lower_privileges();

1605

return EX_OSERR;

1606

;

1607

}

1608

strcpy(network.ifr_name, interface);

1609

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

1610

if(ret == -1){

1611

perror_plus("ioctl SIOCGIFFLAGS");

1612

#ifdef __linux__

1613

if(restore_loglevel){

1614

ret = klogctl(7, NULL, 0);

1615

if(ret == -1){

1616

perror_plus("klogctl");

1617

}

1618

}

1619

#endif /* __linux__ */

1620

/* Lower privileges */

1621

lower_privileges();

1622

return EX_OSERR;

1623

}

1624

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

1649

if(not interface_is_up(interface)){

1650

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

1651

ret_errno = errno;

1652

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

1653

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

1654

return ret_errno;

1655

}

1625

1656

network.ifr_flags |= IFF_UP;

1626

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

1657

1658

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1659

if(sd < 0){

1660

ret_errno = errno;

1661

perror_plus("socket");

1662

errno = old_errno;

1663

return ret_errno;

1664

}

1665

1666

if(quit_now){

1667

close(sd);

1668

errno = old_errno;

1669

return EINTR;

1670

}

1671

1672

if(debug){

1673

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

1674

interface);

1675

}

1676

1677

/* Raise priviliges */

1678

raise_privileges();

1679

1680

#ifdef __linux__

1681

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1682

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

1683

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

1684

bool restore_loglevel = true;

1685

if(ret_linux == -1){

1686

restore_loglevel = false;

1687

perror_plus("klogctl");

1688

}

1689

#endif /* __linux__ */

1690

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

1691

ret_errno = errno;

1692

#ifdef __linux__

1693

if(restore_loglevel){

1694

ret_linux = klogctl(7, NULL, 0);

1695

if(ret_linux == -1){

1696

perror_plus("klogctl");

1697

}

1698

}

1699

#endif /* __linux__ */

1700

1701

/* Lower privileges */

1702

lower_privileges();

1703

1704

/* Close the socket */

1705

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

1627

1706

if(ret == -1){

1707

perror_plus("close");

1708

}

1709

1710

if(ret_setflags == -1){

1711

errno = ret_errno;

1628

1712

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1629

#ifdef __linux__

1630

if(restore_loglevel){

1631

ret = klogctl(7, NULL, 0);

1632

if(ret == -1){

1633

perror_plus("klogctl");

1634

}

1635

}

1636

#endif /* __linux__ */

1637

/* Lower privileges */

1638

lower_privileges();

1639

return EX_OSERR;

1713

errno = old_errno;

1714

return ret_errno;

1640

1715

}

1716

} else if(debug){

1717

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

1718

interface);

1641

1719

}

1720

1642

1721

/* Sleep checking until interface is running.

1643

1722

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

1644

1723

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

1645

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

1646

if(ret == -1){

1647

perror_plus("ioctl SIOCGIFFLAGS");

1648

} else if(network.ifr_flags & IFF_RUNNING){

1724

if(interface_is_running(interface)){

1649

1725

break;

1650

1726

}

1651

1727

struct timespec sleeptime = { .tv_nsec = 250000000 };

1654

1730

perror_plus("nanosleep");

1655

1731

}

1656

1732

}

1657

/* Close the socket */

1658

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

1659

if(ret == -1){

1660

perror_plus("close");

1733

1734

errno = old_errno;

1735

return 0;

1736

}

1737

1738

error_t take_down_interface(const char *const interface){

1739

error_t old_errno = errno;

1740

struct ifreq network;

1741

unsigned int if_index = if_nametoindex(interface);

1742

if(if_index == 0){

1743

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

1744

errno = old_errno;

1745

return ENXIO;

1661

1746

}

1662

#ifdef __linux__

1663

if(restore_loglevel){

1664

/* Restores kernel loglevel to default */

1665

ret = klogctl(7, NULL, 0);

1747

if(interface_is_up(interface)){

1748

error_t ret_errno = 0;

1749

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

1750

ret_errno = errno;

1751

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

1752

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

1753

return ret_errno;

1754

}

1755

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

1756

1757

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

1758

if(sd < 0){

1759

ret_errno = errno;

1760

perror_plus("socket");

1761

errno = old_errno;

1762

return ret_errno;

1763

}

1764

1765

if(debug){

1766

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

1767

interface);

1768

}

1769

1770

/* Raise priviliges */

1771

raise_privileges();

1772

1773

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

1774

ret_errno = errno;

1775

1776

/* Lower privileges */

1777

lower_privileges();

1778

1779

/* Close the socket */

1780

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

1666

1781

if(ret == -1){

1667

perror_plus("klogctl");

1668

}

1782

perror_plus("close");

1783

}

1784

1785

if(ret_setflags == -1){

1786

errno = ret_errno;

1787

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1788

errno = old_errno;

1789

return ret_errno;

1790

}

1791

} else if(debug){

1792

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

1793

interface);

1669

1794

}

1670

#endif /* __linux__ */

1671

/* Lower privileges */

1672

lower_privileges();

1673

return errno;

1795

1796

errno = old_errno;

1797

return 0;

1674

1798

}

1675

1799

1676

1800

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

1801

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

1802

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

1803

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

1804

.interfaces = NULL, .interfaces_size = 0 };

1677

1805

AvahiSServiceBrowser *sb = NULL;

1678

int error;

1806

error_t ret_errno;

1679

1807

int ret;

1680

1808

intmax_t tmpmax;

1681

1809

char *tmp;

1682

1810

int exitcode = EXIT_SUCCESS;

1683

const char *interface = "";

1684

struct ifreq network;

1685

int sd = -1;

1686

bool take_down_interface = false;

1811

char *interfaces_to_take_down = NULL;

1812

size_t interfaces_to_take_down_size = 0;

1687

1813

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

1688

1814

bool tempdir_created = false;

1689

1815

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1690

1816

const char *seckey = PATHDIR "/" SECKEY;

1691

1817

const char *pubkey = PATHDIR "/" PUBKEY;

1818

char *interfaces_hooks = NULL;

1692

1819

1693

1820

bool gnutls_initialized = false;

1694

1821

bool gpgme_initialized = false;

1785

1912

connect_to = arg;

1786

1913

break;

1787

1914

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

1788

interface = arg;

1915

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

1916

arg, (int)',');

1917

if(ret_errno != 0){

1918

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

1919

}

1789

1920

break;

1790

1921

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

1791

1922

seckey = arg;

1915

2046

}

1916

2047

1917

2048

/* Lower privileges */

1918

errno = 0;

1919

ret = seteuid(uid);

1920

if(ret == -1){

1921

perror_plus("seteuid");

2049

lower_privileges();

2050

}

2051

}

2052

2053

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

2054

{

2055

char *interface = NULL;

2056

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

2057

interface))){

2058

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

2059

and if_nametoindex(interface) == 0){

2060

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

2061

fprintf_plus(stderr, "Not using nonexisting interface"

2062

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

2063

}

2064

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

2065

interface = NULL;

1922

2066

}

1923

2067

}

1924

2068

}

1925

2069

1926

2070

/* Run network hooks */

1927

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

1928

goto end;

2071

{

2072

if(mc.interfaces != NULL){

2073

interfaces_hooks = malloc(mc.interfaces_size);

2074

if(interfaces_hooks == NULL){

2075

perror_plus("malloc");

2076

goto end;

2077

}

2078

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

2079

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

2080

}

2081

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

2082

interfaces_hooks : "", delay)){

2083

goto end;

2084

}

1929

2085

}

1930

2086

1931

2087

if(not debug){

1932

2088

avahi_set_log_function(empty_log);

1933

2089

}

1934

2090

1935

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

1936

struct dirent **direntries;

1937

/* First look for interfaces that are up */

1938

ret = scandir(sys_class_net, &direntries, up_interface,

1939

alphasort);

1940

if(ret == 0){

1941

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

1942

free(direntries);

1943

ret = scandir(sys_class_net, &direntries, good_interface,

1944

alphasort);

1945

}

1946

if(ret >= 1){

1947

/* Pick the first interface returned */

1948

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

1949

if(debug){

1950

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

1951

}

1952

if(interface == NULL){

1953

perror_plus("malloc");

1954

free(direntries);

1955

exitcode = EXIT_FAILURE;

1956

goto end;

1957

}

1958

free(direntries);

1959

} else {

1960

free(direntries);

1961

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

1962

exitcode = EXIT_FAILURE;

1963

goto end;

1964

}

1965

}

1966

1967

2091

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

1968

2092

from the signal handler */

1969

2093

/* Initialize the pseudo-RNG for Avahi */

1970

2094

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

1971

mc.simple_poll = avahi_simple_poll_new();

1972

if(mc.simple_poll == NULL){

2095

simple_poll = avahi_simple_poll_new();

2096

if(simple_poll == NULL){

1973

2097

fprintf_plus(stderr,

1974

2098

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

1975

2099

exitcode = EX_UNAVAILABLE;

2039

2163

}

2040

2164

}

2041

2165

2042

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

2043

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

2044

ret = bring_up_interface(interface, delay);

2045

if(ret){

2046

errno = ret;

2047

perror_plus("Failed to bring up interface");

2048

}

2166

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

2167

if(mc.interfaces == NULL){

2168

struct dirent **direntries;

2169

/* Look for any good interfaces */

2170

ret = scandir(sys_class_net, &direntries, good_interface,

2171

alphasort);

2172

if(ret >= 1){

2173

/* Add all found interfaces to interfaces list */

2174

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

2175

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

2176

direntries[i]->d_name);

2177

if(ret_errno != 0){

2178

errno = ret_errno;

2179

perror_plus("argz_add");

2180

continue;

2181

}

2182

if(debug){

2183

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

2184

direntries[i]->d_name);

2185

}

2186

}

2187

free(direntries);

2188

} else {

2189

free(direntries);

2190

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

2191

exitcode = EXIT_FAILURE;

2192

goto end;

2193

}

2194

}

2195

2196

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

2197

{

2198

char *interface = NULL;

2199

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

2200

interface))){

2201

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

2202

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

2203

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

2204

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

2205

interface);

2206

interface = NULL;

2207

while((interface = argz_next(mc.interfaces,

2208

mc.interfaces_size, interface))){

2209

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

2210

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

2211

interface);

2212

interface = NULL;

2213

}

2214

}

2215

break;

2216

}

2217

bool interface_was_up = interface_is_up(interface);

2218

ret = bring_up_interface(interface, delay);

2219

if(not interface_was_up){

2220

if(ret != 0){

2221

errno = ret;

2222

perror_plus("Failed to bring up interface");

2223

} else {

2224

ret_errno = argz_add(&interfaces_to_take_down,

2225

&interfaces_to_take_down_size,

2226

interface);

2227

if(ret_errno != 0){

2228

errno = ret_errno;

2229

perror_plus("argz_add");

2230

}

2231

}

2232

}

2233

}

2234

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

2235

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

2236

}

2237

}

2238

2239

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

2240

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

2241

if(debug){

2242

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

2243

mc.interfaces);

2244

}

2245

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

2049

2246

}

2050

2247

2051

2248

if(quit_now){

2052

2249

goto end;

2053

2250

}

2054

2251

2055

ret = init_gnutls_global(pubkey, seckey);

2252

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

2056

2253

if(ret == -1){

2057

2254

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

2058

2255

exitcode = EX_UNAVAILABLE;

2075

2272

goto end;

2076

2273

}

2077

2274

2078

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

2275

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

2079

2276

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

2080

2277

exitcode = EX_UNAVAILABLE;

2081

2278

goto end;

2102

2299

goto end;

2103

2300

}

2104

2301

2105

uint16_t port;

2302

in_port_t port;

2106

2303

errno = 0;

2107

2304

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

2108

2305

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

2109

or tmpmax != (uint16_t)tmpmax){

2306

or tmpmax != (in_port_t)tmpmax){

2110

2307

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

2111

2308

exitcode = EX_USAGE;

2112

2309

goto end;

2113

2310

}

2114

2311

2115

2312

if(quit_now){

2116

2313

goto end;

2117

2314

}

2118

2315

2119

port = (uint16_t)tmpmax;

2316

port = (in_port_t)tmpmax;

2120

2317

*address = '\0';

2121

2318

/* Colon in address indicates IPv6 */

2122

2319

int af;

2138

2335

}

2139

2336

2140

2337

while(not quit_now){

2141

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

2338

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

2339

&mc);

2142

2340

if(quit_now or ret == 0){

2143

2341

break;

2144

2342

}

2146

2344

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

2147

2345

(int)retry_interval);

2148

2346

}

2149

sleep((int)retry_interval);

2347

sleep((unsigned int)retry_interval);

2150

2348

}

2151

2349

2152

2350

if (not quit_now){

2170

2368

config.publish_domain = 0;

2171

2369

2172

2370

/* Allocate a new server */

2173

mc.server = avahi_server_new(avahi_simple_poll_get

2174

(mc.simple_poll), &config, NULL,

2175

NULL, &error);

2371

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2372

&config, NULL, NULL, &ret_errno);

2176

2373

2177

2374

/* Free the Avahi configuration data */

2178

2375

avahi_server_config_free(&config);

2181

2378

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

2182

2379

if(mc.server == NULL){

2183

2380

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

2184

avahi_strerror(error));

2381

avahi_strerror(ret_errno));

2185

2382

exitcode = EX_UNAVAILABLE;

2186

2383

goto end;

2187

2384

}

2193

2390

/* Create the Avahi service browser */

2194

2391

sb = avahi_s_service_browser_new(mc.server, if_index,

2195

2392

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2196

NULL, 0, browse_callback, NULL);

2393

NULL, 0, browse_callback,

2394

(void *)&mc);

2197

2395

if(sb == NULL){

2198

2396

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

2199

2397

avahi_strerror(avahi_server_errno(mc.server)));

2211

2409

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

2212

2410

}

2213

2411

2214

ret = avahi_loop_with_timeout(mc.simple_poll,

2215

(int)(retry_interval * 1000));

2412

ret = avahi_loop_with_timeout(simple_poll,

2413

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

2216

2414

if(debug){

2217

2415

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

2218

2416

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

2225

2423

}

2226

2424

2227

2425

/* Cleanup things */

2426

free(mc.interfaces);

2427

2228

2428

if(sb != NULL)

2229

2429

avahi_s_service_browser_free(sb);

2230

2430

2231

2431

if(mc.server != NULL)

2232

2432

avahi_server_free(mc.server);

2233

2433

2234

if(mc.simple_poll != NULL)

2235

avahi_simple_poll_free(mc.simple_poll);

2434

if(simple_poll != NULL)

2435

avahi_simple_poll_free(simple_poll);

2236

2436

2237

2437

if(gnutls_initialized){

2238

2438

gnutls_certificate_free_credentials(mc.cred);

2255

2455

}

2256

2456

}

2257

2457

2258

/* Run network hooks */

2259

run_network_hooks("stop", interface, delay);

2260

2261

2458

/* Re-raise priviliges */

2262

2459

{

2263

2460

raise_privileges();

2264

2461

2265

/* Take down the network interface */

2266

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

2267

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

2268

if(ret == -1){

2269

perror_plus("ioctl SIOCGIFFLAGS");

2270

} else if(network.ifr_flags & IFF_UP){

2271

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

2272

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

2273

if(ret == -1){

2274

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2462

/* Run network hooks */

2463

run_network_hooks("stop", interfaces_hooks != NULL ?

2464

interfaces_hooks : "", delay);

2465

2466

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

2467

{

2468

char *interface = NULL;

2469

while((interface=argz_next(interfaces_to_take_down,

2470

interfaces_to_take_down_size,

2471

interface))){

2472

ret_errno = take_down_interface(interface);

2473

if(ret_errno != 0){

2474

errno = ret_errno;

2475

perror_plus("Failed to take down interface");

2275

2476

}

2276

2477

}

2277

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

2278

if(ret == -1){

2279

perror_plus("close");

2478

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

2479

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

2480

" down\n");

2280

2481

}

2281

2482

}

2282

}

2283

/* Lower privileges permanently */

2284

errno = 0;

2285

ret = setuid(uid);

2286

if(ret == -1){

2287

perror_plus("setuid");

2288

}

2483

2484

lower_privileges_permanently();

2485

}

2486

2487

free(interfaces_to_take_down);

2488

free(interfaces_hooks);

2289

2489

2290

2490

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

2291

2491

if(tempdir_created){