/mandos/release : revision 237.7.87

9

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

10

*

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* Everything else is

12

13

12

13

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*

15

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

16

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

41

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

43

stdout, ferror(), remove() */

44

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

44

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

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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() */

61

*/

62

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

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strtoimax() */

64

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

64

65

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

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66

program_invocation_short_name */

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67

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

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

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WEXITSTATUS(), WTERMSIG() */

89

90

#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(),

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argz_count() */

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91

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#ifdef __linux__

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

138

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

139

136

char *connect_to = NULL;

140

137

const char *hookdir = HOOKDIR;

141

uid_t uid = 65534;

142

gid_t gid = 65534;

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138

144

139

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

145

140

typedef struct server{

146

141

const char *ip;

147

in_port_t port;

142

uint16_t port;

148

143

AvahiIfIndex if_index;

149

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int af;

150

145

struct timespec last_seen;

154

149

155

150

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

156

151

typedef struct {

152

AvahiSimplePoll *simple_poll;

157

153

AvahiServer *server;

158

154

gnutls_certificate_credentials_t cred;

159

155

unsigned int dh_bits;

161

157

const char *priority;

162

158

gpgme_ctx_t ctx;

163

159

server *current_server;

164

char *interfaces;

165

size_t interfaces_size;

166

160

} mandos_context;

167

161

168

/* global so signal handler can reach it*/

169

AvahiSimplePoll *simple_poll;

162

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

163

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

164

.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

170

167

171

168

sig_atomic_t quit_now = 0;

172

169

int signal_received = 0;

187

184

188

185

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

189

186

program_invocation_short_name));

190

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

187

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

191

188

}

192

189

193

190

/*

208

205

}

209

206

210

207

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

211

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

212

int af, server **current_server){

208

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

209

int af){

213

210

int ret;

214

211

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

215

212

if(new_server == NULL){

225

222

return false;

226

223

}

227

224

/* Special case of first server */

228

if(*current_server == NULL){

225

if (mc.current_server == NULL){

229

226

new_server->next = new_server;

230

227

new_server->prev = new_server;

231

*current_server = new_server;

228

mc.current_server = new_server;

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229

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

233

230

} else {

234

new_server->next = *current_server;

235

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

231

new_server->next = mc.current_server;

232

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

236

233

new_server->prev->next = new_server;

237

(*current_server)->prev = new_server;

234

mc.current_server->prev = new_server;

238

235

}

239

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

236

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

240

237

if(ret == -1){

241

238

perror_plus("clock_gettime");

242

239

return false;

248

245

* Initialize GPGME.

249

246

*/

250

247

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

251

const char *tempdir, mandos_context *mc){

248

const char *tempdir){

252

249

gpgme_error_t rc;

253

250

gpgme_engine_info_t engine_info;

254

251

252

255

253

/*

256

254

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

257

255

*/

273

271

return false;

274

272

}

275

273

276

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

274

rc = gpgme_op_import(mc.ctx, pgp_data);

277

275

if(rc != GPG_ERR_NO_ERROR){

278

276

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

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gpgme_strsource(rc), gpgme_strerror(rc));

323

321

}

324

322

325

323

/* Create new GPGME "context" */

326

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

324

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

327

325

if(rc != GPG_ERR_NO_ERROR){

328

326

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

329

327

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

344

342

*/

345

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

344

size_t crypto_size,

347

char **plaintext,

348

mandos_context *mc){

345

char **plaintext){

349

346

gpgme_data_t dh_crypto, dh_plain;

350

347

gpgme_error_t rc;

351

348

ssize_t ret;

377

374

378

375

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

379

376

data buffer */

380

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

377

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

381

378

if(rc != GPG_ERR_NO_ERROR){

382

379

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

383

380

gpgme_strsource(rc), gpgme_strerror(rc));

384

381

plaintext_length = -1;

385

382

if(debug){

386

383

gpgme_decrypt_result_t result;

387

result = gpgme_op_decrypt_result(mc->ctx);

384

result = gpgme_op_decrypt_result(mc.ctx);

388

385

if(result == NULL){

389

386

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

390

387

} else {

468

465

}

469

466

470

467

static const char * safer_gnutls_strerror(int value){

471

const char *ret = gnutls_strerror(value);

468

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

469

-Wunreachable-code */

472

470

if(ret == NULL)

473

471

ret = "(unknown)";

474

472

return ret;

481

479

}

482

480

483

481

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename,

485

mandos_context *mc){

482

const char *seckeyfilename){

486

483

int ret;

487

484

488

485

if(debug){

505

502

}

506

503

507

504

/* OpenPGP credentials */

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

509

506

if(ret != GNUTLS_E_SUCCESS){

510

507

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

511

508

safer_gnutls_strerror(ret));

521

518

}

522

519

523

520

ret = gnutls_certificate_set_openpgp_key_file

524

(mc->cred, pubkeyfilename, seckeyfilename,

521

(mc.cred, pubkeyfilename, seckeyfilename,

525

522

GNUTLS_OPENPGP_FMT_BASE64);

526

523

if(ret != GNUTLS_E_SUCCESS){

527

524

fprintf_plus(stderr,

533

530

}

534

531

535

532

/* GnuTLS server initialization */

536

ret = gnutls_dh_params_init(&mc->dh_params);

533

ret = gnutls_dh_params_init(&mc.dh_params);

537

534

if(ret != GNUTLS_E_SUCCESS){

538

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

536

" initialization: %s\n",

540

537

safer_gnutls_strerror(ret));

541

538

goto globalfail;

542

539

}

543

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

540

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

544

541

if(ret != GNUTLS_E_SUCCESS){

545

542

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

546

543

safer_gnutls_strerror(ret));

547

544

goto globalfail;

548

545

}

549

546

550

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

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

551

548

552

549

return 0;

553

550

554

551

globalfail:

555

552

556

gnutls_certificate_free_credentials(mc->cred);

553

gnutls_certificate_free_credentials(mc.cred);

557

554

gnutls_global_deinit();

558

gnutls_dh_params_deinit(mc->dh_params);

555

gnutls_dh_params_deinit(mc.dh_params);

559

556

return -1;

560

557

}

561

558

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

559

static int init_gnutls_session(gnutls_session_t *session){

564

560

int ret;

565

561

/* GnuTLS session creation */

566

562

do {

578

574

{

579

575

const char *err;

580

576

do {

581

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

577

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

582

578

if(quit_now){

583

579

gnutls_deinit(*session);

584

580

return -1;

595

591

596

592

do {

597

593

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc->cred);

594

mc.cred);

599

595

if(quit_now){

600

596

gnutls_deinit(*session);

601

597

return -1;

611

607

/* ignore client certificate if any. */

612

608

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

609

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

615

611

616

612

return 0;

617

613

}

621

617

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

622

618

623

619

/* Called when a Mandos server is found */

624

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

620

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

625

621

AvahiIfIndex if_index,

626

int af, mandos_context *mc){

622

int af){

627

623

int ret, tcp_sd = -1;

628

624

ssize_t sret;

629

625

union {

659

655

return -1;

660

656

}

661

657

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);

658

ret = init_gnutls_session(&session);

695

659

if(ret != 0){

696

660

return -1;

697

661

}

698

662

699

663

if(debug){

700

664

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

701

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

665

PRIu16 "\n", ip, port);

702

666

}

703

667

704

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

735

699

goto mandos_end;

736

700

}

737

701

if(af == AF_INET6){

738

to.in6.sin6_port = htons(port);

739

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

743

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

744

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

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

707

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

708

-Wunreachable-code*/

748

709

if(if_index == AVAHI_IF_UNSPEC){

749

710

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

750

711

" incomplete without a network interface\n");

755

716

to.in6.sin6_scope_id = (uint32_t)if_index;

756

717

}

757

718

} else {

758

to.in.sin_port = htons(port);

719

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

720

-Wconversion and

721

-Wunreachable-code */

759

722

}

760

723

761

724

if(quit_now){

769

732

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

770

733

perror_plus("if_indextoname");

771

734

} else {

772

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

773

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

735

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

736

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

774

737

}

775

738

} else {

776

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

777

ip, (uintmax_t)port);

739

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

740

ip, port);

778

741

}

779

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

780

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

858

821

goto mandos_end;

859

822

}

860

823

861

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

862

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

863

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

864

gnutls_transport_set_ptr(session,

865

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

866

826

867

827

if(quit_now){

868

828

errno = EINTR;

973

933

if(buffer_length > 0){

974

934

ssize_t decrypted_buffer_size;

975

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

976

&decrypted_buffer, mc);

936

&decrypted_buffer);

977

937

if(decrypted_buffer_size >= 0){

978

938

979

939

written = 0;

1040

1000

AVAHI_GCC_UNUSED AvahiStringList *txt,

1041

1001

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1042

1002

flags,

1043

void* mc){

1044

if(r == NULL){

1045

return;

1046

}

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1047

1005

1048

1006

/* Called whenever a service has been resolved successfully or

1049

1007

timed out */

1058

1016

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

1059

1017

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

1060

1018

domain,

1061

avahi_strerror(avahi_server_errno

1062

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

1019

avahi_strerror(avahi_server_errno(mc.server)));

1063

1020

break;

1064

1021

1065

1022

case AVAHI_RESOLVER_FOUND:

1071

1028

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

1072

1029

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

1073

1030

}

1074

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

1075

interface,

1076

avahi_proto_to_af(proto),

1077

mc);

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1078

1033

if(ret == 0){

1079

avahi_simple_poll_quit(simple_poll);

1034

avahi_simple_poll_quit(mc.simple_poll);

1080

1035

} else {

1081

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

1082

avahi_proto_to_af(proto),

1083

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

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1084

1038

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

1085

1039

" list\n", name);

1086

1040

}

1099

1053

const char *domain,

1100

1054

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1101

1055

flags,

1102

void* mc){

1103

if(b == NULL){

1104

return;

1105

}

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1106

1058

1107

1059

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

1108

1060

is removed from the LAN */

1116

1068

case AVAHI_BROWSER_FAILURE:

1117

1069

1118

1070

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

1119

avahi_strerror(avahi_server_errno

1120

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

1121

avahi_simple_poll_quit(simple_poll);

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1122

1073

return;

1123

1074

1124

1075

case AVAHI_BROWSER_NEW:

1127

1078

the callback function is called the Avahi server will free the

1128

1079

resolver for us. */

1129

1080

1130

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

1131

interface, protocol, name, type,

1132

domain, protocol, 0,

1133

resolve_callback, mc) == NULL)

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1134

1084

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

1135

1085

" %s\n", name,

1136

avahi_strerror(avahi_server_errno

1137

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

1086

avahi_strerror(avahi_server_errno(mc.server)));

1138

1087

break;

1139

1088

1140

1089

case AVAHI_BROWSER_REMOVE:

1159

1108

signal_received = sig;

1160

1109

int old_errno = errno;

1161

1110

/* set main loop to exit */

1162

if(simple_poll != NULL){

1163

avahi_simple_poll_quit(simple_poll);

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1164

1113

}

1165

1114

errno = old_errno;

1166

1115

}

1167

1116

1168

1117

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

1169

1118

int ret;

1170

error_t ret_errno;

1171

1119

1172

1120

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

1173

1121

if(s < 0){

1174

ret_errno = errno;

1175

1122

perror_plus("socket");

1176

errno = ret_errno;

1177

1123

return false;

1178

1124

}

1179

1125

strcpy(ifr->ifr_name, ifname);

1180

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1181

1127

if(ret == -1){

1182

1128

if(debug){

1183

ret_errno = errno;

1184

1129

perror_plus("ioctl SIOCGIFFLAGS");

1185

errno = ret_errno;

1186

1130

}

1187

1131

return false;

1188

1132

}

1257

1201

}

1258

1202

1259

1203

/*

1260

* This function determines if a network interface is up.

1261

*/

1262

bool interface_is_up(const char *interface){

1263

struct ifreq ifr;

1264

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

1265

if(debug){

1266

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

1267

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

1268

}

1269

return false;

1270

}

1271

1272

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

1273

}

1274

1275

/*

1276

* This function determines if a network interface is running

1277

*/

1278

bool interface_is_running(const char *interface){

1279

struct ifreq ifr;

1280

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

1281

if(debug){

1282

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

1283

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

1284

}

1285

return false;

1286

}

1287

1288

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

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;

1289

1244

}

1290

1245

1291

1246

int notdotentries(const struct dirent *direntry){

1360

1315

return 1;

1361

1316

}

1362

1317

1363

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1364

mandos_context *mc){

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1365

1319

int ret;

1366

1320

struct timespec now;

1367

1321

struct timespec waited_time;

1368

1322

intmax_t block_time;

1369

1323

1370

1324

while(true){

1371

if(mc->current_server == NULL){

1325

if(mc.current_server == NULL){

1372

1326

if (debug){

1373

1327

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

1374

1328

" No timeout!\n");

1388

1342

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

1389

1343

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

1390

1344

waited_time.tv_sec = (now.tv_sec

1391

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

1345

- mc.current_server->last_seen.tv_sec);

1392

1346

waited_time.tv_nsec = (now.tv_nsec

1393

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

1347

- mc.current_server->last_seen.tv_nsec);

1394

1348

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

1395

1349

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

1396

1350

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

1404

1358

}

1405

1359

1406

1360

if(block_time <= 0){

1407

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

1408

mc->current_server->port,

1409

mc->current_server->if_index,

1410

mc->current_server->af, mc);

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);

1411

1365

if(ret == 0){

1412

avahi_simple_poll_quit(s);

1366

avahi_simple_poll_quit(mc.simple_poll);

1413

1367

return 0;

1414

1368

}

1415

1369

ret = clock_gettime(CLOCK_MONOTONIC,

1416

&mc->current_server->last_seen);

1370

&mc.current_server->last_seen);

1417

1371

if(ret == -1){

1418

1372

perror_plus("clock_gettime");

1419

1373

return -1;

1420

1374

}

1421

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

1375

mc.current_server = mc.current_server->next;

1422

1376

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

1423

1377

servers, but don't block */

1424

1378

}

1433

1387

}

1434

1388

}

1435

1389

1436

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

1437

error_t raise_privileges(void){

1438

error_t old_errno = errno;

1439

error_t ret_errno = 0;

1440

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

1441

ret_errno = errno;

1442

perror_plus("seteuid");

1443

}

1444

errno = old_errno;

1445

return ret_errno;

1446

}

1447

1448

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

1449

error_t raise_privileges_permanently(void){

1450

error_t old_errno = errno;

1451

error_t ret_errno = raise_privileges();

1452

if(ret_errno != 0){

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

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

1457

ret_errno = errno;

1458

perror_plus("seteuid");

1459

}

1460

errno = old_errno;

1461

return ret_errno;

1462

}

1463

1464

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

1465

error_t lower_privileges(void){

1466

error_t old_errno = errno;

1467

error_t ret_errno = 0;

1468

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

1469

ret_errno = errno;

1470

perror_plus("seteuid");

1471

}

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

1476

/* Lower privileges permanently */

1477

error_t lower_privileges_permanently(void){

1478

error_t old_errno = errno;

1479

error_t ret_errno = 0;

1480

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

1481

ret_errno = errno;

1482

perror_plus("setuid");

1483

}

1484

errno = old_errno;

1485

return ret_errno;

1486

}

1487

1488

1390

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

1489

1391

const float delay){

1490

1392

struct dirent **direntries;

1493

1395

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

1494

1396

alphasort);

1495

1397

if(numhooks == -1){

1496

if(errno == ENOENT){

1497

if(debug){

1498

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

1499

" found\n", hookdir);

1500

}

1501

} else {

1502

perror_plus("scandir");

1503

}

1398

perror_plus("scandir");

1504

1399

} else {

1505

1400

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

1506

1401

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

1519

1414

if(hook_pid == 0){

1520

1415

/* Child */

1521

1416

/* Raise privileges */

1522

raise_privileges_permanently();

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

}

1523

1428

/* Set group */

1524

1429

errno = 0;

1525

1430

ret = setgid(0);

1545

1450

perror_plus("setenv");

1546

1451

_exit(EX_OSERR);

1547

1452

}

1548

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

1453

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

1549

1454

if(ret == -1){

1550

1455

perror_plus("setenv");

1551

1456

_exit(EX_OSERR);

1568

1473

_exit(EX_OSERR);

1569

1474

}

1570

1475

free(delaystring);

1571

if(connect_to != NULL){

1572

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

1573

if(ret == -1){

1574

perror_plus("setenv");

1575

_exit(EX_OSERR);

1576

}

1577

}

1578

1476

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

1579

1477

perror_plus("execl");

1580

1478

_exit(EXIT_FAILURE);

1618

1516

return true;

1619

1517

}

1620

1518

1621

error_t bring_up_interface(const char *const interface,

1622

const float delay){

1623

int sd = -1;

1624

error_t old_errno = errno;

1625

error_t ret_errno = 0;

1626

int ret, ret_setflags;

1627

struct ifreq network;

1628

unsigned int if_index = if_nametoindex(interface);

1629

if(if_index == 0){

1630

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

1631

errno = old_errno;

1632

return ENXIO;

1633

}

1634

1635

if(quit_now){

1636

errno = old_errno;

1637

return EINTR;

1638

}

1639

1640

if(not interface_is_up(interface)){

1641

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

1642

ret_errno = errno;

1643

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

1644

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

1645

return ret_errno;

1646

}

1647

network.ifr_flags |= IFF_UP;

1648

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1651

ret_errno = errno;

1652

perror_plus("socket");

1653

errno = old_errno;

1654

return ret_errno;

1655

}

1656

1657

if(quit_now){

1658

close(sd);

1659

errno = old_errno;

1660

return EINTR;

1661

}

1662

1663

if(debug){

1664

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

1665

interface);

1666

}

1667

1668

/* Raise priviliges */

1669

raise_privileges();

1670

1671

#ifdef __linux__

1672

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1673

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

1674

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

1675

bool restore_loglevel = true;

1676

if(ret_linux == -1){

1677

restore_loglevel = false;

1678

perror_plus("klogctl");

1679

}

1680

#endif /* __linux__ */

1681

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

1682

ret_errno = errno;

1683

#ifdef __linux__

1684

if(restore_loglevel){

1685

ret_linux = klogctl(7, NULL, 0);

1686

if(ret_linux == -1){

1687

perror_plus("klogctl");

1688

}

1689

}

1690

#endif /* __linux__ */

1691

1692

/* Lower privileges */

1693

lower_privileges();

1694

1695

/* Close the socket */

1696

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

1697

if(ret == -1){

1698

perror_plus("close");

1699

}

1700

1701

if(ret_setflags == -1){

1702

errno = ret_errno;

1703

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1704

errno = old_errno;

1705

return ret_errno;

1706

}

1707

} else if(debug){

1708

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

1709

interface);

1710

}

1711

1712

/* Sleep checking until interface is running.

1713

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

1714

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

1715

if(interface_is_running(interface)){

1716

break;

1717

}

1718

struct timespec sleeptime = { .tv_nsec = 250000000 };

1719

ret = nanosleep(&sleeptime, NULL);

1720

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

1721

perror_plus("nanosleep");

1722

}

1723

}

1724

1725

errno = old_errno;

1726

return 0;

1727

}

1728

1729

error_t take_down_interface(const char *const interface){

1730

int sd = -1;

1731

error_t old_errno = errno;

1732

error_t ret_errno = 0;

1733

int ret, ret_setflags;

1734

struct ifreq network;

1735

unsigned int if_index = if_nametoindex(interface);

1736

if(if_index == 0){

1737

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

1738

errno = old_errno;

1739

return ENXIO;

1740

}

1741

if(interface_is_up(interface)){

1742

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

1743

ret_errno = errno;

1744

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

1745

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

1746

return ret_errno;

1747

}

1748

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

1749

1750

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

if(sd < 0){

1752

ret_errno = errno;

1753

perror_plus("socket");

1754

errno = old_errno;

1755

return ret_errno;

1756

}

1757

1758

if(debug){

1759

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

1760

interface);

1761

}

1762

1763

/* Raise priviliges */

1764

raise_privileges();

1765

1766

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

1767

ret_errno = errno;

1768

1769

/* Lower privileges */

1770

lower_privileges();

1771

1772

/* Close the socket */

1773

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

1774

if(ret == -1){

1775

perror_plus("close");

1776

}

1777

1778

if(ret_setflags == -1){

1779

errno = ret_errno;

1780

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1781

errno = old_errno;

1782

return ret_errno;

1783

}

1784

} else if(debug){

1785

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

1786

interface);

1787

}

1788

1789

errno = old_errno;

1790

return 0;

1791

}

1792

1793

1519

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

1794

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

1795

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

1796

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

1797

.interfaces = NULL, .interfaces_size = 0 };

1798

1520

AvahiSServiceBrowser *sb = NULL;

1799

error_t ret_errno;

1521

int error;

1800

1522

int ret;

1801

1523

intmax_t tmpmax;

1802

1524

char *tmp;

1803

1525

int exitcode = EXIT_SUCCESS;

1804

char *interfaces_to_take_down = NULL;

1805

size_t interfaces_to_take_down_size = 0;

1526

const char *interface = "";

1527

struct ifreq network;

1528

int sd = -1;

1529

bool take_down_interface = false;

1530

uid_t uid;

1531

gid_t gid;

1806

1532

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

1807

1533

bool tempdir_created = false;

1808

1534

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1809

1535

const char *seckey = PATHDIR "/" SECKEY;

1810

1536

const char *pubkey = PATHDIR "/" PUBKEY;

1811

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

1813

1537

1814

1538

bool gnutls_initialized = false;

1815

1539

bool gpgme_initialized = false;

1877

1601

.group = 2 },

1878

1602

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

1879

1603

.arg = "SECONDS",

1880

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

1604

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

1881

1605

.group = 2 },

1882

1606

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

1883

1607

.arg = "DIR",

1906

1630

connect_to = arg;

1907

1631

break;

1908

1632

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

1909

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

1910

arg, (int)',');

1911

if(ret_errno != 0){

1912

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

1913

}

1633

interface = arg;

1914

1634

break;

1915

1635

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

1916

1636

seckey = arg;

1994

1714

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

1995

1715

1996

1716

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

1717

errno = 0;

1718

ret = seteuid(0);

1719

if(ret == -1){

1720

perror_plus("seteuid");

1721

} else {

1998

1722

struct stat st;

1999

1723

2000

1724

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

2040

1764

}

2041

1765

2042

1766

/* Lower privileges */

2043

lower_privileges();

2044

}

2045

}

2046

2047

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

2048

{

2049

char *interface = NULL;

2050

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

2051

interface))){

2052

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

2053

and if_nametoindex(interface) == 0){

2054

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

2055

fprintf_plus(stderr, "Not using nonexisting interface"

2056

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

2057

}

2058

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

2059

interface = NULL;

1767

errno = 0;

1768

ret = seteuid(uid);

1769

if(ret == -1){

1770

perror_plus("seteuid");

2060

1771

}

2061

1772

}

2062

1773

}

2063

1774

2064

1775

/* Run network hooks */

2065

{

2066

if(mc.interfaces != NULL){

2067

interfaces_hooks = malloc(mc.interfaces_size);

2068

if(interfaces_hooks == NULL){

2069

perror_plus("malloc");

2070

goto end;

2071

}

2072

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

2073

interfaces_hooks_size = mc.interfaces_size;

2074

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2075

(int)',');

2076

}

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

1776

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

1777

goto end;

2081

1778

}

2082

1779

2083

1780

if(not debug){

2084

1781

avahi_set_log_function(empty_log);

2085

1782

}

2086

1783

1784

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

1785

struct dirent **direntries;

1786

/* First look for interfaces that are up */

1787

ret = scandir(sys_class_net, &direntries, up_interface,

1788

alphasort);

1789

if(ret == 0){

1790

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

1791

free(direntries);

1792

ret = scandir(sys_class_net, &direntries, good_interface,

1793

alphasort);

1794

}

1795

if(ret >= 1){

1796

/* Pick the first interface returned */

1797

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

1798

if(debug){

1799

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

1800

}

1801

if(interface == NULL){

1802

perror_plus("malloc");

1803

free(direntries);

1804

exitcode = EXIT_FAILURE;

1805

goto end;

1806

}

1807

free(direntries);

1808

} else {

1809

free(direntries);

1810

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

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

}

1815

2087

1816

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

2088

1817

from the signal handler */

2089

1818

/* Initialize the pseudo-RNG for Avahi */

2090

1819

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

2091

simple_poll = avahi_simple_poll_new();

2092

if(simple_poll == NULL){

1820

mc.simple_poll = avahi_simple_poll_new();

1821

if(mc.simple_poll == NULL){

2093

1822

fprintf_plus(stderr,

2094

1823

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

2095

1824

exitcode = EX_UNAVAILABLE;

2159

1888

}

2160

1889

}

2161

1890

2162

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

2163

if(mc.interfaces == NULL){

2164

struct dirent **direntries;

2165

/* Look for any good interfaces */

2166

ret = scandir(sys_class_net, &direntries, good_interface,

2167

alphasort);

2168

if(ret >= 1){

2169

/* Add all found interfaces to interfaces list */

2170

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

2171

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

2172

direntries[i]->d_name);

2173

if(ret_errno != 0){

2174

perror_plus("argz_add");

2175

continue;

2176

}

2177

if(debug){

2178

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

2179

direntries[i]->d_name);

2180

}

2181

}

2182

free(direntries);

2183

} else {

2184

free(direntries);

2185

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

2186

exitcode = EXIT_FAILURE;

2187

goto end;

2188

}

2189

}

2190

2191

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

2192

{

2193

char *interface = NULL;

2194

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

2195

interface))){

2196

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

2197

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

2198

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

2199

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

2200

interface);

2201

interface = NULL;

2202

while((interface = argz_next(mc.interfaces,

2203

mc.interfaces_size, interface))){

2204

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

2205

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

2206

interface);

2207

interface = NULL;

1891

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

1892

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

1893

if_index = (AvahiIfIndex) if_nametoindex(interface);

1894

if(if_index == 0){

1895

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

1896

exitcode = EX_UNAVAILABLE;

1897

goto end;

1898

}

1899

1900

if(quit_now){

1901

goto end;

1902

}

1903

1904

/* Re-raise priviliges */

1905

errno = 0;

1906

ret = seteuid(0);

1907

if(ret == -1){

1908

perror_plus("seteuid");

1909

}

1910

1911

#ifdef __linux__

1912

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1913

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

1914

ret = klogctl(8, NULL, 5);

1915

bool restore_loglevel = true;

1916

if(ret == -1){

1917

restore_loglevel = false;

1918

perror_plus("klogctl");

1919

}

1920

#endif /* __linux__ */

1921

1922

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1923

if(sd < 0){

1924

perror_plus("socket");

1925

exitcode = EX_OSERR;

1926

#ifdef __linux__

1927

if(restore_loglevel){

1928

ret = klogctl(7, NULL, 0);

1929

if(ret == -1){

1930

perror_plus("klogctl");

1931

}

1932

}

1933

#endif /* __linux__ */

1934

/* Lower privileges */

1935

errno = 0;

1936

ret = seteuid(uid);

1937

if(ret == -1){

1938

perror_plus("seteuid");

1939

}

1940

goto end;

1941

}

1942

strcpy(network.ifr_name, interface);

1943

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

1944

if(ret == -1){

1945

perror_plus("ioctl SIOCGIFFLAGS");

1946

#ifdef __linux__

1947

if(restore_loglevel){

1948

ret = klogctl(7, NULL, 0);

1949

if(ret == -1){

1950

perror_plus("klogctl");

1951

}

1952

}

1953

#endif /* __linux__ */

1954

exitcode = EX_OSERR;

1955

/* Lower privileges */

1956

errno = 0;

1957

ret = seteuid(uid);

1958

if(ret == -1){

1959

perror_plus("seteuid");

1960

}

1961

goto end;

1962

}

1963

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

1964

network.ifr_flags |= IFF_UP;

1965

take_down_interface = true;

1966

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

1967

if(ret == -1){

1968

take_down_interface = false;

1969

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1970

exitcode = EX_OSERR;

1971

#ifdef __linux__

1972

if(restore_loglevel){

1973

ret = klogctl(7, NULL, 0);

1974

if(ret == -1){

1975

perror_plus("klogctl");

2208

1976

}

2209

1977

}

1978

#endif /* __linux__ */

1979

/* Lower privileges */

1980

errno = 0;

1981

ret = seteuid(uid);

1982

if(ret == -1){

1983

perror_plus("seteuid");

1984

}

1985

goto end;

1986

}

1987

}

1988

/* Sleep checking until interface is running.

1989

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

1990

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

1991

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

1992

if(ret == -1){

1993

perror_plus("ioctl SIOCGIFFLAGS");

1994

} else if(network.ifr_flags & IFF_RUNNING){

2210

1995

break;

2211

1996

}

2212

bool interface_was_up = interface_is_up(interface);

2213

ret = bring_up_interface(interface, delay);

2214

if(not interface_was_up){

2215

if(ret != 0){

2216

errno = ret;

2217

perror_plus("Failed to bring up interface");

2218

} else {

2219

ret_errno = argz_add(&interfaces_to_take_down,

2220

&interfaces_to_take_down_size,

2221

interface);

2222

}

2223

}

2224

}

2225

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

2226

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

2227

}

2228

}

2229

2230

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

2231

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

2232

if(debug){

2233

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

2234

mc.interfaces);

2235

}

2236

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

1997

struct timespec sleeptime = { .tv_nsec = 250000000 };

1998

ret = nanosleep(&sleeptime, NULL);

1999

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

2000

perror_plus("nanosleep");

2001

}

2002

}

2003

if(not take_down_interface){

2004

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

2005

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

2006

if(ret == -1){

2007

perror_plus("close");

2008

}

2009

}

2010

#ifdef __linux__

2011

if(restore_loglevel){

2012

/* Restores kernel loglevel to default */

2013

ret = klogctl(7, NULL, 0);

2014

if(ret == -1){

2015

perror_plus("klogctl");

2016

}

2017

}

2018

#endif /* __linux__ */

2019

/* Lower privileges */

2020

errno = 0;

2021

/* Lower privileges */

2022

ret = seteuid(uid);

2023

if(ret == -1){

2024

perror_plus("seteuid");

2025

}

2237

2026

}

2238

2027

2239

2028

if(quit_now){

2240

2029

goto end;

2241

2030

}

2242

2031

2243

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

2032

ret = init_gnutls_global(pubkey, seckey);

2244

2033

if(ret == -1){

2245

2034

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

2246

2035

exitcode = EX_UNAVAILABLE;

2263

2052

goto end;

2264

2053

}

2265

2054

2266

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

2055

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

2267

2056

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

2268

2057

exitcode = EX_UNAVAILABLE;

2269

2058

goto end;

2279

2068

/* Connect directly, do not use Zeroconf */

2280

2069

/* (Mainly meant for debugging) */

2281

2070

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

2282

2283

2071

if(address == NULL){

2284

2072

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

2285

2073

exitcode = EX_USAGE;

2290

2078

goto end;

2291

2079

}

2292

2080

2293

in_port_t port;

2081

uint16_t port;

2294

2082

errno = 0;

2295

2083

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

2296

2084

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

2297

or tmpmax != (in_port_t)tmpmax){

2085

or tmpmax != (uint16_t)tmpmax){

2298

2086

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

2299

2087

exitcode = EX_USAGE;

2300

2088

goto end;

2301

2089

}

2302

2090

2303

2091

if(quit_now){

2304

2092

goto end;

2305

2093

}

2306

2094

2307

port = (in_port_t)tmpmax;

2095

port = (uint16_t)tmpmax;

2308

2096

*address = '\0';

2309

2097

/* Colon in address indicates IPv6 */

2310

2098

int af;

2326

2114

}

2327

2115

2328

2116

while(not quit_now){

2329

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

2330

&mc);

2117

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

2331

2118

if(quit_now or ret == 0){

2332

2119

break;

2333

2120

}

2335

2122

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

2336

2123

(int)retry_interval);

2337

2124

}

2338

sleep((unsigned int)retry_interval);

2125

sleep((int)retry_interval);

2339

2126

}

2340

2127

2341

2128

if (not quit_now){

2359

2146

config.publish_domain = 0;

2360

2147

2361

2148

/* Allocate a new server */

2362

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2363

&config, NULL, NULL, &ret_errno);

2149

mc.server = avahi_server_new(avahi_simple_poll_get

2150

(mc.simple_poll), &config, NULL,

2151

NULL, &error);

2364

2152

2365

2153

/* Free the Avahi configuration data */

2366

2154

avahi_server_config_free(&config);

2369

2157

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

2370

2158

if(mc.server == NULL){

2371

2159

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

2372

avahi_strerror(ret_errno));

2160

avahi_strerror(error));

2373

2161

exitcode = EX_UNAVAILABLE;

2374

2162

goto end;

2375

2163

}

2381

2169

/* Create the Avahi service browser */

2382

2170

sb = avahi_s_service_browser_new(mc.server, if_index,

2383

2171

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2384

NULL, 0, browse_callback,

2385

(void *)&mc);

2172

NULL, 0, browse_callback, NULL);

2386

2173

if(sb == NULL){

2387

2174

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

2388

2175

avahi_strerror(avahi_server_errno(mc.server)));

2400

2187

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

2401

2188

}

2402

2189

2403

ret = avahi_loop_with_timeout(simple_poll,

2404

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

2190

ret = avahi_loop_with_timeout(mc.simple_poll,

2191

(int)(retry_interval * 1000));

2405

2192

if(debug){

2406

2193

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

2407

2194

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

2414

2201

}

2415

2202

2416

2203

/* Cleanup things */

2417

free(mc.interfaces);

2418

2419

2204

if(sb != NULL)

2420

2205

avahi_s_service_browser_free(sb);

2421

2206

2422

2207

if(mc.server != NULL)

2423

2208

avahi_server_free(mc.server);

2424

2209

2425

if(simple_poll != NULL)

2426

avahi_simple_poll_free(simple_poll);

2210

if(mc.simple_poll != NULL)

2211

avahi_simple_poll_free(mc.simple_poll);

2427

2212

2428

2213

if(gnutls_initialized){

2429

2214

gnutls_certificate_free_credentials(mc.cred);

2446

2231

}

2447

2232

}

2448

2233

2234

/* Run network hooks */

2235

run_network_hooks("stop", interface, delay);

2236

2449

2237

/* Re-raise priviliges */

2450

2238

{

2451

raise_privileges();

2452

2453

/* Run network hooks */

2454

run_network_hooks("stop", interfaces_hooks != NULL ?

2455

interfaces_hooks : "", delay);

2456

2457

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

2458

{

2459

char *interface = NULL;

2460

while((interface=argz_next(interfaces_to_take_down,

2461

interfaces_to_take_down_size,

2462

interface))){

2463

ret_errno = take_down_interface(interface);

2464

if(ret_errno != 0){

2465

errno = ret_errno;

2466

perror_plus("Failed to take down interface");

2239

errno = 0;

2240

ret = seteuid(0);

2241

if(ret == -1){

2242

perror_plus("seteuid");

2243

}

2244

2245

/* Take down the network interface */

2246

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

2247

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

2248

if(ret == -1){

2249

perror_plus("ioctl SIOCGIFFLAGS");

2250

} else if(network.ifr_flags & IFF_UP){

2251

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

2252

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

2253

if(ret == -1){

2254

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2467

2255

}

2468

2256

}

2469

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

2470

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

2471

" down\n");

2257

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

2258

if(ret == -1){

2259

perror_plus("close");

2472

2260

}

2473

2261

}

2474

2475

lower_privileges_permanently();

2476

}

2477

2478

free(interfaces_to_take_down);

2479

free(interfaces_hooks);

2262

}

2263

/* Lower privileges permanently */

2264

errno = 0;

2265

ret = setuid(uid);

2266

if(ret == -1){

2267

perror_plus("setuid");

2268

}

2480

2269

2481

2270

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

2482

2271

if(tempdir_created){