/mandos/release : revision 237.7.177

9

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

10

*

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* Everything else is

12

13

12

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*

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* 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

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

43

stdout, ferror(), remove() */

44

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

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

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

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

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strtof(), abort() */

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*/

62

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

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strtoimax() */

64

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

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64

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

66

65

program_invocation_short_name */

67

66

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

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87

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

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WEXITSTATUS(), WTERMSIG() */

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89

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

90

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

93

argz_count() */

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94

92

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#ifdef __linux__

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96

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

135

138

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

136

139

char *connect_to = NULL;

137

140

const char *hookdir = HOOKDIR;

141

uid_t uid = 65534;

142

gid_t gid = 65534;

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143

139

144

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

140

145

typedef struct server{

141

146

const char *ip;

142

uint16_t port;

147

in_port_t port;

143

148

AvahiIfIndex if_index;

144

149

int af;

145

150

struct timespec last_seen;

149

154

150

155

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

151

156

typedef struct {

152

AvahiSimplePoll *simple_poll;

153

157

AvahiServer *server;

154

158

gnutls_certificate_credentials_t cred;

155

159

unsigned int dh_bits;

157

161

const char *priority;

158

162

gpgme_ctx_t ctx;

159

163

server *current_server;

164

char *interfaces;

165

size_t interfaces_size;

160

166

} mandos_context;

161

167

162

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

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

168

/* global so signal handler can reach it*/

169

AvahiSimplePoll *simple_poll;

167

170

168

171

sig_atomic_t quit_now = 0;

169

172

int signal_received = 0;

184

187

185

188

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

186

189

program_invocation_short_name));

187

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

190

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

188

191

}

189

192

190

193

/*

205

208

}

206

209

207

210

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

208

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

209

int af){

211

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

212

int af, server **current_server){

210

213

int ret;

211

214

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

212

215

if(new_server == NULL){

222

225

return false;

223

226

}

224

227

/* Special case of first server */

225

if (mc.current_server == NULL){

228

if(*current_server == NULL){

226

229

new_server->next = new_server;

227

230

new_server->prev = new_server;

228

mc.current_server = new_server;

231

*current_server = new_server;

229

232

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

230

233

} else {

231

new_server->next = mc.current_server;

232

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

234

new_server->next = *current_server;

235

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

233

236

new_server->prev->next = new_server;

234

mc.current_server->prev = new_server;

237

(*current_server)->prev = new_server;

235

238

}

236

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

239

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

237

240

if(ret == -1){

238

241

perror_plus("clock_gettime");

239

242

return false;

245

248

* Initialize GPGME.

246

249

*/

247

250

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

248

const char *tempdir){

251

const char *tempdir, mandos_context *mc){

249

252

gpgme_error_t rc;

250

253

gpgme_engine_info_t engine_info;

251

254

252

253

255

/*

254

256

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

255

257

*/

271

273

return false;

272

274

}

273

275

274

rc = gpgme_op_import(mc.ctx, pgp_data);

276

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

275

277

if(rc != GPG_ERR_NO_ERROR){

276

278

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

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279

gpgme_strsource(rc), gpgme_strerror(rc));

321

323

}

322

324

323

325

/* Create new GPGME "context" */

324

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

326

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

325

327

if(rc != GPG_ERR_NO_ERROR){

326

328

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

327

329

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

342

344

*/

343

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

344

346

size_t crypto_size,

345

char **plaintext){

347

char **plaintext,

348

mandos_context *mc){

346

349

gpgme_data_t dh_crypto, dh_plain;

347

350

gpgme_error_t rc;

348

351

ssize_t ret;

374

377

375

378

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

376

379

data buffer */

377

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

380

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

378

381

if(rc != GPG_ERR_NO_ERROR){

379

382

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

380

383

gpgme_strsource(rc), gpgme_strerror(rc));

381

384

plaintext_length = -1;

382

385

if(debug){

383

386

gpgme_decrypt_result_t result;

384

result = gpgme_op_decrypt_result(mc.ctx);

387

result = gpgme_op_decrypt_result(mc->ctx);

385

388

if(result == NULL){

386

389

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

387

390

} else {

465

468

}

466

469

467

470

static const char * safer_gnutls_strerror(int value){

468

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

469

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

470

472

if(ret == NULL)

471

473

ret = "(unknown)";

472

474

return ret;

479

481

}

480

482

481

483

static int init_gnutls_global(const char *pubkeyfilename,

482

const char *seckeyfilename){

484

const char *seckeyfilename,

485

mandos_context *mc){

483

486

int ret;

484

487

485

488

if(debug){

502

505

}

503

506

504

507

/* OpenPGP credentials */

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

506

509

if(ret != GNUTLS_E_SUCCESS){

507

510

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

508

511

safer_gnutls_strerror(ret));

518

521

}

519

522

520

523

ret = gnutls_certificate_set_openpgp_key_file

521

(mc.cred, pubkeyfilename, seckeyfilename,

524

(mc->cred, pubkeyfilename, seckeyfilename,

522

525

GNUTLS_OPENPGP_FMT_BASE64);

523

526

if(ret != GNUTLS_E_SUCCESS){

524

527

fprintf_plus(stderr,

530

533

}

531

534

532

535

/* GnuTLS server initialization */

533

ret = gnutls_dh_params_init(&mc.dh_params);

536

ret = gnutls_dh_params_init(&mc->dh_params);

534

537

if(ret != GNUTLS_E_SUCCESS){

535

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

539

" initialization: %s\n",

537

540

safer_gnutls_strerror(ret));

538

541

goto globalfail;

539

542

}

540

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

543

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

541

544

if(ret != GNUTLS_E_SUCCESS){

542

545

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

543

546

safer_gnutls_strerror(ret));

544

547

goto globalfail;

545

548

}

546

549

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

550

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

548

551

549

552

return 0;

550

553

551

554

globalfail:

552

555

553

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_certificate_free_credentials(mc->cred);

554

557

gnutls_global_deinit();

555

gnutls_dh_params_deinit(mc.dh_params);

558

gnutls_dh_params_deinit(mc->dh_params);

556

559

return -1;

557

560

}

558

561

559

static int init_gnutls_session(gnutls_session_t *session){

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

560

564

int ret;

561

565

/* GnuTLS session creation */

562

566

do {

574

578

{

575

579

const char *err;

576

580

do {

577

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

581

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

578

582

if(quit_now){

579

583

gnutls_deinit(*session);

580

584

return -1;

591

595

592

596

do {

593

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

594

mc.cred);

598

mc->cred);

595

599

if(quit_now){

596

600

gnutls_deinit(*session);

597

601

return -1;

607

611

/* ignore client certificate if any. */

608

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

609

613

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

611

615

612

616

return 0;

613

617

}

617

621

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

618

622

619

623

/* Called when a Mandos server is found */

620

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

624

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

621

625

AvahiIfIndex if_index,

622

int af){

626

int af, mandos_context *mc){

623

627

int ret, tcp_sd = -1;

624

628

ssize_t sret;

625

629

union {

655

659

return -1;

656

660

}

657

661

658

ret = init_gnutls_session(&session);

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);

659

695

if(ret != 0){

660

696

return -1;

661

697

}

662

698

663

699

if(debug){

664

700

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

665

PRIu16 "\n", ip, port);

701

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

666

702

}

667

703

668

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

699

735

goto mandos_end;

700

736

}

701

737

if(af == AF_INET6){

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

738

to.in6.sin6_port = htons(port);

706

739

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

740

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

708

741

-Wunreachable-code*/

732

765

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

733

766

perror_plus("if_indextoname");

734

767

} else {

735

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

736

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

768

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

769

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

737

770

}

738

771

} else {

739

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

740

ip, port);

772

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

773

ip, (uintmax_t)port);

741

774

}

742

775

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

776

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

821

854

goto mandos_end;

822

855

}

823

856

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

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);

826

862

827

863

if(quit_now){

828

864

errno = EINTR;

933

969

if(buffer_length > 0){

934

970

ssize_t decrypted_buffer_size;

935

971

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

936

&decrypted_buffer);

972

&decrypted_buffer, mc);

937

973

if(decrypted_buffer_size >= 0){

938

974

939

975

written = 0;

1000

1036

AVAHI_GCC_UNUSED AvahiStringList *txt,

1001

1037

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1002

1038

flags,

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1039

void* mc){

1040

if(r == NULL){

1041

return;

1042

}

1005

1043

1006

1044

/* Called whenever a service has been resolved successfully or

1007

1045

timed out */

1016

1054

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

1017

1055

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

1018

1056

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

1057

avahi_strerror(avahi_server_errno

1058

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

1020

1059

break;

1021

1060

1022

1061

case AVAHI_RESOLVER_FOUND:

1028

1067

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

1029

1068

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

1030

1069

}

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1070

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

1071

interface,

1072

avahi_proto_to_af(proto),

1073

mc);

1033

1074

if(ret == 0){

1034

avahi_simple_poll_quit(mc.simple_poll);

1075

avahi_simple_poll_quit(simple_poll);

1035

1076

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1077

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

1078

avahi_proto_to_af(proto),

1079

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

1038

1080

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

1039

1081

" list\n", name);

1040

1082

}

1053

1095

const char *domain,

1054

1096

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1055

1097

flags,

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1098

void* mc){

1099

if(b == NULL){

1100

return;

1101

}

1058

1102

1059

1103

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

1060

1104

is removed from the LAN */

1068

1112

case AVAHI_BROWSER_FAILURE:

1069

1113

1070

1114

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1115

avahi_strerror(avahi_server_errno

1116

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

1117

avahi_simple_poll_quit(simple_poll);

1073

1118

return;

1074

1119

1075

1120

case AVAHI_BROWSER_NEW:

1078

1123

the callback function is called the Avahi server will free the

1079

1124

resolver for us. */

1080

1125

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

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)

1084

1130

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

1085

1131

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

1132

avahi_strerror(avahi_server_errno

1133

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

1087

1134

break;

1088

1135

1089

1136

case AVAHI_BROWSER_REMOVE:

1108

1155

signal_received = sig;

1109

1156

int old_errno = errno;

1110

1157

/* set main loop to exit */

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1158

if(simple_poll != NULL){

1159

avahi_simple_poll_quit(simple_poll);

1113

1160

}

1114

1161

errno = old_errno;

1115

1162

}

1116

1163

1117

1164

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

1118

1165

int ret;

1166

error_t ret_errno;

1119

1167

1120

1168

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

1121

1169

if(s < 0){

1170

ret_errno = errno;

1122

1171

perror_plus("socket");

1172

errno = ret_errno;

1123

1173

return false;

1124

1174

}

1125

1175

strcpy(ifr->ifr_name, ifname);

1126

1176

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

1177

if(ret == -1){

1128

1178

if(debug){

1179

ret_errno = errno;

1129

1180

perror_plus("ioctl SIOCGIFFLAGS");

1181

errno = ret_errno;

1130

1182

}

1131

1183

return false;

1132

1184

}

1201

1253

}

1202

1254

1203

1255

/*

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

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);

1244

1285

}

1245

1286

1246

1287

int notdotentries(const struct dirent *direntry){

1315

1356

return 1;

1316

1357

}

1317

1358

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

mandos_context *mc){

1319

1361

int ret;

1320

1362

struct timespec now;

1321

1363

struct timespec waited_time;

1322

1364

intmax_t block_time;

1323

1365

1324

1366

while(true){

1325

if(mc.current_server == NULL){

1367

if(mc->current_server == NULL){

1326

1368

if (debug){

1327

1369

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

1328

1370

" No timeout!\n");

1342

1384

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

1343

1385

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

1344

1386

waited_time.tv_sec = (now.tv_sec

1345

- mc.current_server->last_seen.tv_sec);

1387

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

1346

1388

waited_time.tv_nsec = (now.tv_nsec

1347

- mc.current_server->last_seen.tv_nsec);

1389

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

1348

1390

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

1349

1391

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

1350

1392

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

1358

1400

}

1359

1401

1360

1402

if(block_time <= 0){

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

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);

1365

1407

if(ret == 0){

1366

avahi_simple_poll_quit(mc.simple_poll);

1408

avahi_simple_poll_quit(s);

1367

1409

return 0;

1368

1410

}

1369

1411

ret = clock_gettime(CLOCK_MONOTONIC,

1370

&mc.current_server->last_seen);

1412

&mc->current_server->last_seen);

1371

1413

if(ret == -1){

1372

1414

perror_plus("clock_gettime");

1373

1415

return -1;

1374

1416

}

1375

mc.current_server = mc.current_server->next;

1417

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

1376

1418

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

1377

1419

servers, but don't block */

1378

1420

}

1387

1429

}

1388

1430

}

1389

1431

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

1390

1484

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

1391

1485

const float delay){

1392

1486

struct dirent **direntries;

1395

1489

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

1396

1490

alphasort);

1397

1491

if(numhooks == -1){

1398

perror_plus("scandir");

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

}

1399

1500

} else {

1400

1501

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

1401

1502

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

1414

1515

if(hook_pid == 0){

1415

1516

/* Child */

1416

1517

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1518

raise_privileges_permanently();

1428

1519

/* Set group */

1429

1520

errno = 0;

1430

1521

ret = setgid(0);

1523

1614

return true;

1524

1615

}

1525

1616

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

1526

1789

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 };

1527

1794

AvahiSServiceBrowser *sb = NULL;

1528

int error;

1795

error_t ret_errno;

1529

1796

int ret;

1530

1797

intmax_t tmpmax;

1531

1798

char *tmp;

1532

1799

int exitcode = EXIT_SUCCESS;

1533

const char *interface = "";

1534

struct ifreq network;

1535

int sd = -1;

1536

bool take_down_interface = false;

1537

uid_t uid;

1538

gid_t gid;

1800

char *interfaces_to_take_down = NULL;

1801

size_t interfaces_to_take_down_size = 0;

1539

1802

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

1540

1803

bool tempdir_created = false;

1541

1804

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1542

1805

const char *seckey = PATHDIR "/" SECKEY;

1543

1806

const char *pubkey = PATHDIR "/" PUBKEY;

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1544

1809

1545

1810

bool gnutls_initialized = false;

1546

1811

bool gpgme_initialized = false;

1637

1902

connect_to = arg;

1638

1903

break;

1639

1904

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

1640

interface = arg;

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

}

1641

1910

break;

1642

1911

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

1643

1912

seckey = arg;

1721

1990

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

1722

1991

1723

1992

/* Re-raise priviliges */

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

1728

} else {

1993

if(raise_privileges() == 0){

1729

1994

struct stat st;

1730

1995

1731

1996

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

1771

2036

}

1772

2037

1773

2038

/* Lower privileges */

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

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;

1778

2056

}

1779

2057

}

1780

2058

}

1781

2059

1782

2060

/* Run network hooks */

1783

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

1784

goto end;

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

}

1785

2077

}

1786

2078

1787

2079

if(not debug){

1788

2080

avahi_set_log_function(empty_log);

1789

2081

}

1790

2082

1791

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

1792

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1795

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

if(ret >= 1){

1803

/* Pick the first interface returned */

1804

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

1805

if(debug){

1806

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

1807

}

1808

if(interface == NULL){

1809

perror_plus("malloc");

1810

free(direntries);

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

free(direntries);

1815

} else {

1816

free(direntries);

1817

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

1818

exitcode = EXIT_FAILURE;

1819

goto end;

1820

}

1821

}

1822

1823

2083

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

1824

2084

from the signal handler */

1825

2085

/* Initialize the pseudo-RNG for Avahi */

1826

2086

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

1827

mc.simple_poll = avahi_simple_poll_new();

1828

if(mc.simple_poll == NULL){

2087

simple_poll = avahi_simple_poll_new();

2088

if(simple_poll == NULL){

1829

2089

fprintf_plus(stderr,

1830

2090

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

1831

2091

exitcode = EX_UNAVAILABLE;

1895

2155

}

1896

2156

}

1897

2157

1898

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

1899

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

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

if(if_index == 0){

1902

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

1903

exitcode = EX_UNAVAILABLE;

1904

goto end;

1905

}

1906

1907

if(quit_now){

1908

goto end;

1909

}

1910

1911

/* Re-raise priviliges */

1912

errno = 0;

1913

ret = seteuid(0);

1914

if(ret == -1){

1915

perror_plus("seteuid");

1916

}

1917

1918

#ifdef __linux__

1919

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1920

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

1921

ret = klogctl(8, NULL, 5);

1922

bool restore_loglevel = true;

1923

if(ret == -1){

1924

restore_loglevel = false;

1925

perror_plus("klogctl");

1926

}

1927

#endif /* __linux__ */

1928

1929

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1930

if(sd < 0){

1931

perror_plus("socket");

1932

exitcode = EX_OSERR;

1933

#ifdef __linux__

1934

if(restore_loglevel){

1935

ret = klogctl(7, NULL, 0);

1936

if(ret == -1){

1937

perror_plus("klogctl");

1938

}

1939

}

1940

#endif /* __linux__ */

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

strcpy(network.ifr_name, interface);

1950

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

1951

if(ret == -1){

1952

perror_plus("ioctl SIOCGIFFLAGS");

1953

#ifdef __linux__

1954

if(restore_loglevel){

1955

ret = klogctl(7, NULL, 0);

1956

if(ret == -1){

1957

perror_plus("klogctl");

1958

}

1959

}

1960

#endif /* __linux__ */

1961

exitcode = EX_OSERR;

1962

/* Lower privileges */

1963

errno = 0;

1964

ret = seteuid(uid);

1965

if(ret == -1){

1966

perror_plus("seteuid");

1967

}

1968

goto end;

1969

}

1970

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

1971

network.ifr_flags |= IFF_UP;

1972

take_down_interface = true;

1973

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

1974

if(ret == -1){

1975

take_down_interface = false;

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1977

exitcode = EX_OSERR;

1978

#ifdef __linux__

1979

if(restore_loglevel){

1980

ret = klogctl(7, NULL, 0);

1981

if(ret == -1){

1982

perror_plus("klogctl");

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;

1983

2204

}

1984

2205

}

1985

#endif /* __linux__ */

1986

/* Lower privileges */

1987

errno = 0;

1988

ret = seteuid(uid);

1989

if(ret == -1){

1990

perror_plus("seteuid");

1991

}

1992

goto end;

1993

}

1994

}

1995

/* Sleep checking until interface is running.

1996

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

1997

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

1998

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

1999

if(ret == -1){

2000

perror_plus("ioctl SIOCGIFFLAGS");

2001

} else if(network.ifr_flags & IFF_RUNNING){

2002

2206

break;

2003

2207

}

2004

struct timespec sleeptime = { .tv_nsec = 250000000 };

2005

ret = nanosleep(&sleeptime, NULL);

2006

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

2007

perror_plus("nanosleep");

2008

}

2009

}

2010

if(not take_down_interface){

2011

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

2012

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

2013

if(ret == -1){

2014

perror_plus("close");

2015

}

2016

}

2017

#ifdef __linux__

2018

if(restore_loglevel){

2019

/* Restores kernel loglevel to default */

2020

ret = klogctl(7, NULL, 0);

2021

if(ret == -1){

2022

perror_plus("klogctl");

2023

}

2024

}

2025

#endif /* __linux__ */

2026

/* Lower privileges */

2027

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

2032

}

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);

2033

2233

}

2034

2234

2035

2235

if(quit_now){

2036

2236

goto end;

2037

2237

}

2038

2238

2039

ret = init_gnutls_global(pubkey, seckey);

2239

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

2040

2240

if(ret == -1){

2041

2241

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

2042

2242

exitcode = EX_UNAVAILABLE;

2059

2259

goto end;

2060

2260

}

2061

2261

2062

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

2262

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

2063

2263

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

2064

2264

exitcode = EX_UNAVAILABLE;

2065

2265

goto end;

2075

2275

/* Connect directly, do not use Zeroconf */

2076

2276

/* (Mainly meant for debugging) */

2077

2277

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

2278

2078

2279

if(address == NULL){

2079

2280

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

2080

2281

exitcode = EX_USAGE;

2085

2286

goto end;

2086

2287

}

2087

2288

2088

uint16_t port;

2289

in_port_t port;

2089

2290

errno = 0;

2090

2291

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

2091

2292

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

2092

or tmpmax != (uint16_t)tmpmax){

2293

or tmpmax != (in_port_t)tmpmax){

2093

2294

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

2094

2295

exitcode = EX_USAGE;

2095

2296

goto end;

2096

2297

}

2097

2298

2098

2299

if(quit_now){

2099

2300

goto end;

2100

2301

}

2101

2302

2102

port = (uint16_t)tmpmax;

2303

port = (in_port_t)tmpmax;

2103

2304

*address = '\0';

2104

2305

/* Colon in address indicates IPv6 */

2105

2306

int af;

2121

2322

}

2122

2323

2123

2324

while(not quit_now){

2124

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

2325

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

2326

&mc);

2125

2327

if(quit_now or ret == 0){

2126

2328

break;

2127

2329

}

2129

2331

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

2130

2332

(int)retry_interval);

2131

2333

}

2132

sleep((int)retry_interval);

2334

sleep((unsigned int)retry_interval);

2133

2335

}

2134

2336

2135

2337

if (not quit_now){

2153

2355

config.publish_domain = 0;

2154

2356

2155

2357

/* Allocate a new server */

2156

mc.server = avahi_server_new(avahi_simple_poll_get

2157

(mc.simple_poll), &config, NULL,

2158

NULL, &error);

2358

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2359

&config, NULL, NULL, &ret_errno);

2159

2360

2160

2361

/* Free the Avahi configuration data */

2161

2362

avahi_server_config_free(&config);

2164

2365

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

2165

2366

if(mc.server == NULL){

2166

2367

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

2167

avahi_strerror(error));

2368

avahi_strerror(ret_errno));

2168

2369

exitcode = EX_UNAVAILABLE;

2169

2370

goto end;

2170

2371

}

2176

2377

/* Create the Avahi service browser */

2177

2378

sb = avahi_s_service_browser_new(mc.server, if_index,

2178

2379

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2179

NULL, 0, browse_callback, NULL);

2380

NULL, 0, browse_callback,

2381

(void *)&mc);

2180

2382

if(sb == NULL){

2181

2383

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

2182

2384

avahi_strerror(avahi_server_errno(mc.server)));

2194

2396

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

2195

2397

}

2196

2398

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

2399

ret = avahi_loop_with_timeout(simple_poll,

2400

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

2199

2401

if(debug){

2200

2402

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

2201

2403

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

2208

2410

}

2209

2411

2210

2412

/* Cleanup things */

2413

free(mc.interfaces);

2414

2211

2415

if(sb != NULL)

2212

2416

avahi_s_service_browser_free(sb);

2213

2417

2214

2418

if(mc.server != NULL)

2215

2419

avahi_server_free(mc.server);

2216

2420

2217

if(mc.simple_poll != NULL)

2218

avahi_simple_poll_free(mc.simple_poll);

2421

if(simple_poll != NULL)

2422

avahi_simple_poll_free(simple_poll);

2219

2423

2220

2424

if(gnutls_initialized){

2221

2425

gnutls_certificate_free_credentials(mc.cred);

2238

2442

}

2239

2443

}

2240

2444

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2244

2445

/* Re-raise priviliges */

2245

2446

{

2246

errno = 0;

2247

ret = seteuid(0);

2248

if(ret == -1){

2249

perror_plus("seteuid");

2250

}

2251

2252

/* Take down the network interface */

2253

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

2254

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

2255

if(ret == -1){

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

2258

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

2259

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

2260

if(ret == -1){

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

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");

2262

2463

}

2263

2464

}

2264

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

2265

if(ret == -1){

2266

perror_plus("close");

2465

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

2466

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

2467

" down\n");

2267

2468

}

2268

2469

}

2269

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2470

2471

lower_privileges_permanently();

2472

}

2473

2474

free(interfaces_to_take_down);

2475

free(interfaces_hooks);

2276

2476

2277

2477

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

2278

2478

if(tempdir_created){