/mandos/trunk : revision 602

9

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

10

*

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* Everything else is

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13

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13

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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

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

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stdout, ferror(), remove() */

44

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

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

45

#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() */

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64

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

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program_invocation_short_name */

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66

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

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

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WEXITSTATUS(), WTERMSIG() */

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#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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#ifdef __linux__

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

135

138

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

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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 */

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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

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typedef struct {

152

AvahiSimplePoll *simple_poll;

153

157

AvahiServer *server;

154

158

gnutls_certificate_credentials_t cred;

155

159

unsigned int dh_bits;

159

163

server *current_server;

160

164

} mandos_context;

161

165

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 };

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/* global so signal handler can reach it*/

167

AvahiSimplePoll *simple_poll;

167

168

169

sig_atomic_t quit_now = 0;

169

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int signal_received = 0;

170

171

172

/* Function to use when printing errors */

172

173

void perror_plus(const char *print_text){

174

int e = errno;

173

175

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

174

176

program_invocation_short_name);

177

errno = e;

175

178

perror(print_text);

176

179

}

177

180

181

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

178

182

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

179

183

va_list ap;

180

184

va_start (ap, format);

202

206

}

203

207

204

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

205

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

206

int af){

209

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

210

int af, server **current_server){

207

211

int ret;

208

212

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

209

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if(new_server == NULL){

210

214

perror_plus("malloc");

211

return -1;

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return false;

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216

}

213

217

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

214

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.port = port,

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220

.af = af };

217

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if(new_server->ip == NULL){

218

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perror_plus("strdup");

219

return -1;

223

return false;

220

224

}

221

225

/* Special case of first server */

222

if (mc.current_server == NULL){

226

if(*current_server == NULL){

223

227

new_server->next = new_server;

224

228

new_server->prev = new_server;

225

mc.current_server = new_server;

229

*current_server = new_server;

226

230

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

227

231

} else {

228

new_server->next = mc.current_server;

229

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

232

new_server->next = *current_server;

233

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

230

234

new_server->prev->next = new_server;

231

mc.current_server->prev = new_server;

235

(*current_server)->prev = new_server;

232

236

}

233

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

237

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

234

238

if(ret == -1){

235

239

perror_plus("clock_gettime");

236

return -1;

240

return false;

237

241

}

238

return 0;

242

return true;

239

243

}

240

244

241

245

/*

242

246

* Initialize GPGME.

243

247

*/

244

248

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

245

const char *tempdir){

249

const char *tempdir, mandos_context *mc){

246

250

gpgme_error_t rc;

247

251

gpgme_engine_info_t engine_info;

248

252

249

250

253

/*

251

254

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

252

255

*/

268

271

return false;

269

272

}

270

273

271

rc = gpgme_op_import(mc.ctx, pgp_data);

274

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

272

275

if(rc != GPG_ERR_NO_ERROR){

273

276

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

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277

gpgme_strsource(rc), gpgme_strerror(rc));

318

321

}

319

322

320

323

/* Create new GPGME "context" */

321

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

324

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

322

325

if(rc != GPG_ERR_NO_ERROR){

323

326

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

324

327

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

339

342

*/

340

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

341

344

size_t crypto_size,

342

char **plaintext){

345

char **plaintext,

346

mandos_context *mc){

343

347

gpgme_data_t dh_crypto, dh_plain;

344

348

gpgme_error_t rc;

345

349

ssize_t ret;

371

375

372

376

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

373

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data buffer */

374

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

378

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

375

379

if(rc != GPG_ERR_NO_ERROR){

376

380

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

377

381

gpgme_strsource(rc), gpgme_strerror(rc));

378

382

plaintext_length = -1;

379

383

if(debug){

380

384

gpgme_decrypt_result_t result;

381

result = gpgme_op_decrypt_result(mc.ctx);

385

result = gpgme_op_decrypt_result(mc->ctx);

382

386

if(result == NULL){

383

387

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

384

388

} else {

462

466

}

463

467

464

468

static const char * safer_gnutls_strerror(int value){

465

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

466

-Wunreachable-code */

469

const char *ret = gnutls_strerror(value);

467

470

if(ret == NULL)

468

471

ret = "(unknown)";

469

472

return ret;

476

479

}

477

480

478

481

static int init_gnutls_global(const char *pubkeyfilename,

479

const char *seckeyfilename){

482

const char *seckeyfilename,

483

mandos_context *mc){

480

484

int ret;

481

485

482

486

if(debug){

499

503

}

500

504

501

505

/* OpenPGP credentials */

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

506

ret = gnutls_certificate_allocate_credentials(&mc->cred);

503

507

if(ret != GNUTLS_E_SUCCESS){

504

508

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

505

509

safer_gnutls_strerror(ret));

515

519

}

516

520

517

521

ret = gnutls_certificate_set_openpgp_key_file

518

(mc.cred, pubkeyfilename, seckeyfilename,

522

(mc->cred, pubkeyfilename, seckeyfilename,

519

523

GNUTLS_OPENPGP_FMT_BASE64);

520

524

if(ret != GNUTLS_E_SUCCESS){

521

525

fprintf_plus(stderr,

527

531

}

528

532

529

533

/* GnuTLS server initialization */

530

ret = gnutls_dh_params_init(&mc.dh_params);

534

ret = gnutls_dh_params_init(&mc->dh_params);

531

535

if(ret != GNUTLS_E_SUCCESS){

532

536

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

537

" initialization: %s\n",

534

538

safer_gnutls_strerror(ret));

535

539

goto globalfail;

536

540

}

537

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

541

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

538

542

if(ret != GNUTLS_E_SUCCESS){

539

543

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

540

544

safer_gnutls_strerror(ret));

541

545

goto globalfail;

542

546

}

543

547

544

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

548

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

545

549

546

550

return 0;

547

551

548

552

globalfail:

549

553

550

gnutls_certificate_free_credentials(mc.cred);

554

gnutls_certificate_free_credentials(mc->cred);

551

555

gnutls_global_deinit();

552

gnutls_dh_params_deinit(mc.dh_params);

556

gnutls_dh_params_deinit(mc->dh_params);

553

557

return -1;

554

558

}

555

559

556

static int init_gnutls_session(gnutls_session_t *session){

560

static int init_gnutls_session(gnutls_session_t *session,

561

mandos_context *mc){

557

562

int ret;

558

563

/* GnuTLS session creation */

559

564

do {

571

576

{

572

577

const char *err;

573

578

do {

574

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

579

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

575

580

if(quit_now){

576

581

gnutls_deinit(*session);

577

582

return -1;

588

593

589

594

do {

590

595

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

591

mc.cred);

596

mc->cred);

592

597

if(quit_now){

593

598

gnutls_deinit(*session);

594

599

return -1;

604

609

/* ignore client certificate if any. */

605

610

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

606

611

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

612

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

608

613

609

614

return 0;

610

615

}

614

619

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

615

620

616

621

/* Called when a Mandos server is found */

617

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

622

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

618

623

AvahiIfIndex if_index,

619

int af){

624

int af, mandos_context *mc){

620

625

int ret, tcp_sd = -1;

621

626

ssize_t sret;

622

627

union {

652

657

return -1;

653

658

}

654

659

655

ret = init_gnutls_session(&session);

660

ret = init_gnutls_session(&session, mc);

656

661

if(ret != 0){

657

662

return -1;

658

663

}

659

664

660

665

if(debug){

661

666

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

662

PRIu16 "\n", ip, port);

667

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

663

668

}

664

669

665

670

tcp_sd = socket(pf, SOCK_STREAM, 0);

696

701

goto mandos_end;

697

702

}

698

703

if(af == AF_INET6){

699

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

700

-Wconversion and

701

-Wunreachable-code */

702

704

to.in6.sin6_port = htons(port);

703

705

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

706

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

705

707

-Wunreachable-code*/

729

731

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

730

732

perror_plus("if_indextoname");

731

733

} else {

732

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

733

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

734

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

735

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

734

736

}

735

737

} else {

736

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

737

ip, port);

738

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

739

ip, (uintmax_t)port);

738

740

}

739

741

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

742

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

818

820

goto mandos_end;

819

821

}

820

822

821

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

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

823

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

824

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

825

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

826

gnutls_transport_set_ptr(session,

827

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

823

828

824

829

if(quit_now){

825

830

errno = EINTR;

930

935

if(buffer_length > 0){

931

936

ssize_t decrypted_buffer_size;

932

937

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

933

&decrypted_buffer);

938

&decrypted_buffer, mc);

934

939

if(decrypted_buffer_size >= 0){

935

940

936

941

written = 0;

997

1002

AVAHI_GCC_UNUSED AvahiStringList *txt,

998

1003

AVAHI_GCC_UNUSED AvahiLookupResultFlags

999

1004

flags,

1000

AVAHI_GCC_UNUSED void* userdata){

1001

assert(r);

1005

void* mc){

1006

if(r == NULL){

1007

return;

1008

}

1002

1009

1003

1010

/* Called whenever a service has been resolved successfully or

1004

1011

timed out */

1013

1020

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

1014

1021

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

1015

1022

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

1023

avahi_strerror(avahi_server_errno

1024

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

1017

1025

break;

1018

1026

1019

1027

case AVAHI_RESOLVER_FOUND:

1025

1033

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

1026

1034

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

1027

1035

}

1028

int ret = start_mandos_communication(ip, port, interface,

1029

avahi_proto_to_af(proto));

1036

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

1037

interface,

1038

avahi_proto_to_af(proto),

1039

mc);

1030

1040

if(ret == 0){

1031

avahi_simple_poll_quit(mc.simple_poll);

1041

avahi_simple_poll_quit(simple_poll);

1032

1042

} else {

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

1043

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

1044

avahi_proto_to_af(proto),

1045

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

1046

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

1047

" list\n", name);

1048

}

1035

1049

}

1036

1050

}

1037

1051

}

1047

1061

const char *domain,

1048

1062

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1049

1063

flags,

1050

AVAHI_GCC_UNUSED void* userdata){

1051

assert(b);

1064

void* mc){

1065

if(b == NULL){

1066

return;

1067

}

1052

1068

1053

1069

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

1054

1070

is removed from the LAN */

1062

1078

case AVAHI_BROWSER_FAILURE:

1063

1079

1064

1080

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

1066

avahi_simple_poll_quit(mc.simple_poll);

1081

avahi_strerror(avahi_server_errno

1082

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

1083

avahi_simple_poll_quit(simple_poll);

1067

1084

return;

1068

1085

1069

1086

case AVAHI_BROWSER_NEW:

1072

1089

the callback function is called the Avahi server will free the

1073

1090

resolver for us. */

1074

1091

1075

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

1076

name, type, domain, protocol, 0,

1077

resolve_callback, NULL) == NULL)

1092

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

1093

interface, protocol, name, type,

1094

domain, protocol, 0,

1095

resolve_callback, mc) == NULL)

1078

1096

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

1079

1097

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

1098

avahi_strerror(avahi_server_errno

1099

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

1081

1100

break;

1082

1101

1083

1102

case AVAHI_BROWSER_REMOVE:

1102

1121

signal_received = sig;

1103

1122

int old_errno = errno;

1104

1123

/* set main loop to exit */

1105

if(mc.simple_poll != NULL){

1106

avahi_simple_poll_quit(mc.simple_poll);

1124

if(simple_poll != NULL){

1125

avahi_simple_poll_quit(simple_poll);

1107

1126

}

1108

1127

errno = old_errno;

1109

1128

}

1110

1129

1111

1130

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

1112

1131

int ret;

1132

error_t ret_errno;

1113

1133

1114

1134

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

1115

1135

if(s < 0){

1136

ret_errno = errno;

1116

1137

perror_plus("socket");

1138

errno = ret_errno;

1117

1139

return false;

1118

1140

}

1119

1141

strcpy(ifr->ifr_name, ifname);

1120

1142

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1121

1143

if(ret == -1){

1122

1144

if(debug){

1145

ret_errno = errno;

1123

1146

perror_plus("ioctl SIOCGIFFLAGS");

1147

errno = ret_errno;

1124

1148

}

1125

1149

return false;

1126

1150

}

1195

1219

}

1196

1220

1197

1221

/*

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1236

}

1237

return 1;

1222

* This function determines if a network interface is up.

1223

*/

1224

bool interface_is_up(const char *interface){

1225

struct ifreq ifr;

1226

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

1227

if(debug){

1228

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

1229

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

1230

}

1231

return false;

1232

}

1233

1234

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

1235

}

1236

1237

/*

1238

* This function determines if a network interface is running

1239

*/

1240

bool interface_is_running(const char *interface){

1241

struct ifreq ifr;

1242

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

1243

if(debug){

1244

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

1245

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

1246

}

1247

return false;

1248

}

1249

1250

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

1238

1251

}

1239

1252

1240

1253

int notdotentries(const struct dirent *direntry){

1309

1322

return 1;

1310

1323

}

1311

1324

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1325

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1326

mandos_context *mc){

1313

1327

int ret;

1314

1328

struct timespec now;

1315

1329

struct timespec waited_time;

1316

1330

intmax_t block_time;

1317

1331

1318

1332

while(true){

1319

if(mc.current_server == NULL){

1333

if(mc->current_server == NULL){

1320

1334

if (debug){

1321

1335

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

1322

1336

" No timeout!\n");

1336

1350

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

1337

1351

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

1338

1352

waited_time.tv_sec = (now.tv_sec

1339

- mc.current_server->last_seen.tv_sec);

1353

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

1340

1354

waited_time.tv_nsec = (now.tv_nsec

1341

- mc.current_server->last_seen.tv_nsec);

1355

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

1342

1356

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

1343

1357

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

1344

1358

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

1352

1366

}

1353

1367

1354

1368

if(block_time <= 0){

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1369

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

1370

mc->current_server->port,

1371

mc->current_server->if_index,

1372

mc->current_server->af, mc);

1359

1373

if(ret == 0){

1360

avahi_simple_poll_quit(mc.simple_poll);

1374

avahi_simple_poll_quit(s);

1361

1375

return 0;

1362

1376

}

1363

1377

ret = clock_gettime(CLOCK_MONOTONIC,

1364

&mc.current_server->last_seen);

1378

&mc->current_server->last_seen);

1365

1379

if(ret == -1){

1366

1380

perror_plus("clock_gettime");

1367

1381

return -1;

1368

1382

}

1369

mc.current_server = mc.current_server->next;

1383

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

1370

1384

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

1371

1385

servers, but don't block */

1372

1386

}

1381

1395

}

1382

1396

}

1383

1397

1398

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

1399

error_t raise_privileges(void){

1400

error_t old_errno = errno;

1401

error_t ret_errno = 0;

1402

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

1403

ret_errno = errno;

1404

perror_plus("seteuid");

1405

}

1406

errno = old_errno;

1407

return ret_errno;

1408

}

1409

1410

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

1411

error_t raise_privileges_permanently(void){

1412

error_t old_errno = errno;

1413

error_t ret_errno = raise_privileges();

1414

if(ret_errno != 0){

1415

errno = old_errno;

1416

return ret_errno;

1417

}

1418

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

1419

ret_errno = errno;

1420

perror_plus("seteuid");

1421

}

1422

errno = old_errno;

1423

return ret_errno;

1424

}

1425

1426

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

1427

error_t lower_privileges(void){

1428

error_t old_errno = errno;

1429

error_t ret_errno = 0;

1430

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

1431

ret_errno = errno;

1432

perror_plus("seteuid");

1433

}

1434

errno = old_errno;

1435

return ret_errno;

1436

}

1437

1438

/* Lower privileges permanently */

1439

error_t lower_privileges_permanently(void){

1440

error_t old_errno = errno;

1441

error_t ret_errno = 0;

1442

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

1443

ret_errno = errno;

1444

perror_plus("setuid");

1445

}

1446

errno = old_errno;

1447

return ret_errno;

1448

}

1449

1384

1450

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

1385

1451

const float delay){

1386

1452

struct dirent **direntries;

1389

1455

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

1390

1456

alphasort);

1391

1457

if(numhooks == -1){

1392

perror_plus("scandir");

1458

if(errno == ENOENT){

1459

if(debug){

1460

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

1461

" found\n", hookdir);

1462

}

1463

} else {

1464

perror_plus("scandir");

1465

}

1393

1466

} else {

1394

1467

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

1395

1468

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

1408

1481

if(hook_pid == 0){

1409

1482

/* Child */

1410

1483

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1484

raise_privileges_permanently();

1422

1485

/* Set group */

1423

1486

errno = 0;

1424

1487

ret = setgid(0);

1444

1507

perror_plus("setenv");

1445

1508

_exit(EX_OSERR);

1446

1509

}

1447

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

1510

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

1448

1511

if(ret == -1){

1449

1512

perror_plus("setenv");

1450

1513

_exit(EX_OSERR);

1467

1530

_exit(EX_OSERR);

1468

1531

}

1469

1532

free(delaystring);

1470

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

1471

perror_plus("execl");

1533

if(connect_to != NULL){

1534

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

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

}

1540

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

1541

perror_plus("execl");

1542

_exit(EXIT_FAILURE);

1543

}

1472

1544

} else {

1473

1545

int status;

1474

1546

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

1508

1580

return true;

1509

1581

}

1510

1582

1583

error_t bring_up_interface(const char *const interface,

1584

const float delay){

1585

int sd = -1;

1586

error_t old_errno = errno;

1587

error_t ret_errno = 0;

1588

int ret, ret_setflags;

1589

struct ifreq network;

1590

unsigned int if_index = if_nametoindex(interface);

1591

if(if_index == 0){

1592

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

1593

errno = old_errno;

1594

return ENXIO;

1595

}

1596

1597

if(quit_now){

1598

errno = old_errno;

1599

return EINTR;

1600

}

1601

1602

if(not interface_is_up(interface)){

1603

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

1604

ret_errno = errno;

1605

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

1606

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

1607

return ret_errno;

1608

}

1609

network.ifr_flags |= IFF_UP;

1610

1611

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1612

if(sd < 0){

1613

ret_errno = errno;

1614

perror_plus("socket");

1615

errno = old_errno;

1616

return ret_errno;

1617

}

1618

1619

if(quit_now){

1620

close(sd);

1621

errno = old_errno;

1622

return EINTR;

1623

}

1624

1625

if(debug){

1626

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

1627

interface);

1628

}

1629

1630

/* Raise priviliges */

1631

raise_privileges();

1632

1633

#ifdef __linux__

1634

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1635

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

1636

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

1637

bool restore_loglevel = true;

1638

if(ret_linux == -1){

1639

restore_loglevel = false;

1640

perror_plus("klogctl");

1641

}

1642

#endif /* __linux__ */

1643

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

1644

ret_errno = errno;

1645

#ifdef __linux__

1646

if(restore_loglevel){

1647

ret_linux = klogctl(7, NULL, 0);

1648

if(ret_linux == -1){

1649

perror_plus("klogctl");

1650

}

1651

}

1652

#endif /* __linux__ */

1653

1654

/* Lower privileges */

1655

lower_privileges();

1656

1657

/* Close the socket */

1658

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

1659

if(ret == -1){

1660

perror_plus("close");

1661

}

1662

1663

if(ret_setflags == -1){

1664

errno = ret_errno;

1665

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1666

errno = old_errno;

1667

return ret_errno;

1668

}

1669

} else if(debug){

1670

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

1671

interface);

1672

}

1673

1674

/* Sleep checking until interface is running.

1675

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

1676

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

1677

if(interface_is_running(interface)){

1678

break;

1679

}

1680

struct timespec sleeptime = { .tv_nsec = 250000000 };

1681

ret = nanosleep(&sleeptime, NULL);

1682

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

1683

perror_plus("nanosleep");

1684

}

1685

}

1686

1687

errno = old_errno;

1688

return 0;

1689

}

1690

1691

error_t take_down_interface(const char *const interface){

1692

int sd = -1;

1693

error_t old_errno = errno;

1694

error_t ret_errno = 0;

1695

int ret, ret_setflags;

1696

struct ifreq network;

1697

unsigned int if_index = if_nametoindex(interface);

1698

if(if_index == 0){

1699

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

1700

errno = old_errno;

1701

return ENXIO;

1702

}

1703

if(interface_is_up(interface)){

1704

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

1705

ret_errno = errno;

1706

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

1707

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

1708

return ret_errno;

1709

}

1710

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

1711

1712

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1713

if(sd < 0){

1714

ret_errno = errno;

1715

perror_plus("socket");

1716

errno = old_errno;

1717

return ret_errno;

1718

}

1719

1720

if(debug){

1721

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

1722

interface);

1723

}

1724

1725

/* Raise priviliges */

1726

raise_privileges();

1727

1728

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

1729

ret_errno = errno;

1730

1731

/* Lower privileges */

1732

lower_privileges();

1733

1734

/* Close the socket */

1735

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

1736

if(ret == -1){

1737

perror_plus("close");

1738

}

1739

1740

if(ret_setflags == -1){

1741

errno = ret_errno;

1742

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1743

errno = old_errno;

1744

return ret_errno;

1745

}

1746

} else if(debug){

1747

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

1748

interface);

1749

}

1750

1751

errno = old_errno;

1752

return 0;

1753

}

1754

1511

1755

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

1756

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

1757

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

1758

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

1512

1759

AvahiSServiceBrowser *sb = NULL;

1513

int error;

1760

error_t ret_errno;

1514

1761

int ret;

1515

1762

intmax_t tmpmax;

1516

1763

char *tmp;

1517

1764

int exitcode = EXIT_SUCCESS;

1518

const char *interface = "";

1519

struct ifreq network;

1520

int sd = -1;

1521

bool take_down_interface = false;

1522

uid_t uid;

1523

gid_t gid;

1765

char *interfaces = NULL;

1766

size_t interfaces_size = 0;

1767

char *interfaces_to_take_down = NULL;

1768

size_t interfaces_to_take_down_size = 0;

1524

1769

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

1525

1770

bool tempdir_created = false;

1526

1771

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1527

1772

const char *seckey = PATHDIR "/" SECKEY;

1528

1773

const char *pubkey = PATHDIR "/" PUBKEY;

1774

char *interfaces_hooks = NULL;

1775

size_t interfaces_hooks_size = 0;

1529

1776

1530

1777

bool gnutls_initialized = false;

1531

1778

bool gpgme_initialized = false;

1593

1840

.group = 2 },

1594

1841

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

1595

1842

.arg = "SECONDS",

1596

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

1843

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

1597

1844

.group = 2 },

1598

1845

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

1599

1846

.arg = "DIR",

1622

1869

connect_to = arg;

1623

1870

break;

1624

1871

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

1625

interface = arg;

1872

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

1873

(int)',');

1874

if(ret_errno != 0){

1875

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

1876

}

1626

1877

break;

1627

1878

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

1628

1879

seckey = arg;

1671

1922

argp_state_help(state, state->out_stream,

1672

1923

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

1924

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

1925

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

1677

1926

exit(argp_err_exit_status);

1678

1927

break;

1708

1957

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

1709

1958

1710

1959

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

1715

} else {

1960

if(raise_privileges() == 0){

1716

1961

struct stat st;

1717

1962

1718

1963

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

1766

2011

}

1767

2012

}

1768

2013

2014

/* Remove empty interface names */

2015

{

2016

char *interface = NULL;

2017

while((interface = argz_next(interfaces, interfaces_size,

2018

interface))){

2019

if(if_nametoindex(interface) == 0){

2020

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

2021

fprintf_plus(stderr, "Not using nonexisting interface"

2022

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

2023

}

2024

argz_delete(&interfaces, &interfaces_size, interface);

2025

interface = NULL;

2026

}

2027

}

2028

}

2029

1769

2030

/* Run network hooks */

1770

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

1771

goto end;

2031

{

2032

2033

if(interfaces != NULL){

2034

interfaces_hooks = malloc(interfaces_size);

2035

if(interfaces_hooks == NULL){

2036

perror_plus("malloc");

2037

goto end;

2038

}

2039

memcpy(interfaces_hooks, interfaces, interfaces_size);

2040

interfaces_hooks_size = interfaces_size;

2041

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2042

(int)',');

2043

}

2044

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

2045

interfaces_hooks : "", delay)){

2046

goto end;

2047

}

1772

2048

}

1773

2049

1774

2050

if(not debug){

1775

2051

avahi_set_log_function(empty_log);

1776

2052

}

1777

2053

1778

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

1779

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

if(ret >= 1){

1790

/* Pick the first interface returned */

1791

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

1792

if(debug){

1793

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

1794

}

1795

if(interface == NULL){

1796

perror_plus("malloc");

1797

free(direntries);

1798

exitcode = EXIT_FAILURE;

1799

goto end;

1800

}

1801

free(direntries);

1802

} else {

1803

free(direntries);

1804

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

1805

exitcode = EXIT_FAILURE;

1806

goto end;

1807

}

1808

}

1809

1810

2054

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

1811

2055

from the signal handler */

1812

2056

/* Initialize the pseudo-RNG for Avahi */

1813

2057

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

1814

mc.simple_poll = avahi_simple_poll_new();

1815

if(mc.simple_poll == NULL){

2058

simple_poll = avahi_simple_poll_new();

2059

if(simple_poll == NULL){

1816

2060

fprintf_plus(stderr,

1817

2061

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

1818

2062

exitcode = EX_UNAVAILABLE;

1882

2126

}

1883

2127

}

1884

2128

1885

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

1886

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

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1888

if(if_index == 0){

1889

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

1890

exitcode = EX_UNAVAILABLE;

1891

goto end;

1892

}

1893

1894

if(quit_now){

1895

goto end;

1896

}

1897

1898

/* Re-raise priviliges */

1899

errno = 0;

1900

ret = seteuid(0);

1901

if(ret == -1){

1902

perror_plus("seteuid");

1903

}

1904

1905

#ifdef __linux__

1906

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1907

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

1908

ret = klogctl(8, NULL, 5);

1909

bool restore_loglevel = true;

1910

if(ret == -1){

1911

restore_loglevel = false;

1912

perror_plus("klogctl");

1913

}

1914

#endif /* __linux__ */

1915

1916

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1917

if(sd < 0){

1918

perror_plus("socket");

1919

exitcode = EX_OSERR;

1920

#ifdef __linux__

1921

if(restore_loglevel){

1922

ret = klogctl(7, NULL, 0);

1923

if(ret == -1){

1924

perror_plus("klogctl");

1925

}

1926

}

1927

#endif /* __linux__ */

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1934

goto end;

1935

}

1936

strcpy(network.ifr_name, interface);

1937

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

1938

if(ret == -1){

1939

perror_plus("ioctl SIOCGIFFLAGS");

1940

#ifdef __linux__

1941

if(restore_loglevel){

1942

ret = klogctl(7, NULL, 0);

1943

if(ret == -1){

1944

perror_plus("klogctl");

1945

}

1946

}

1947

#endif /* __linux__ */

1948

exitcode = EX_OSERR;

1949

/* Lower privileges */

1950

errno = 0;

1951

ret = seteuid(uid);

1952

if(ret == -1){

1953

perror_plus("seteuid");

1954

}

1955

goto end;

1956

}

1957

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

1958

network.ifr_flags |= IFF_UP;

1959

take_down_interface = true;

1960

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

1961

if(ret == -1){

1962

take_down_interface = false;

1963

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1964

exitcode = EX_OSERR;

1965

#ifdef __linux__

1966

if(restore_loglevel){

1967

ret = klogctl(7, NULL, 0);

1968

if(ret == -1){

1969

perror_plus("klogctl");

1970

}

1971

}

1972

#endif /* __linux__ */

1973

/* Lower privileges */

1974

errno = 0;

1975

ret = seteuid(uid);

1976

if(ret == -1){

1977

perror_plus("seteuid");

1978

}

1979

goto end;

1980

}

1981

}

1982

/* Sleep checking until interface is running.

1983

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

1984

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

1985

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

1986

if(ret == -1){

1987

perror_plus("ioctl SIOCGIFFLAGS");

1988

} else if(network.ifr_flags & IFF_RUNNING){

1989

break;

1990

}

1991

struct timespec sleeptime = { .tv_nsec = 250000000 };

1992

ret = nanosleep(&sleeptime, NULL);

1993

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

1994

perror_plus("nanosleep");

1995

}

1996

}

1997

if(not take_down_interface){

1998

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

1999

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

2000

if(ret == -1){

2001

perror_plus("close");

2002

}

2003

}

2004

#ifdef __linux__

2005

if(restore_loglevel){

2006

/* Restores kernel loglevel to default */

2007

ret = klogctl(7, NULL, 0);

2008

if(ret == -1){

2009

perror_plus("klogctl");

2010

}

2011

}

2012

#endif /* __linux__ */

2013

/* Lower privileges */

2014

errno = 0;

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

2129

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

2130

if(interfaces == NULL){

2131

struct dirent **direntries;

2132

/* Look for any good interfaces */

2133

ret = scandir(sys_class_net, &direntries, good_interface,

2134

alphasort);

2135

if(ret >= 1){

2136

/* Add all found interfaces to interfaces list */

2137

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

2138

ret_errno = argz_add(&interfaces, &interfaces_size,

2139

direntries[i]->d_name);

2140

if(ret_errno != 0){

2141

perror_plus("argz_add");

2142

continue;

2143

}

2144

if(debug){

2145

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

2146

direntries[i]->d_name);

2147

}

2148

}

2149

free(direntries);

2150

} else {

2151

free(direntries);

2152

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

2153

exitcode = EXIT_FAILURE;

2154

goto end;

2155

}

2156

}

2157

2158

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

2159

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

2160

if(debug){

2161

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

2162

interfaces);

2163

}

2164

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2165

}

2166

2167

/* Bring up interfaces which are down */

2168

if(not (argz_count(interfaces, interfaces_size) == 1

2169

and strcmp(interfaces, "none") == 0)){

2170

char *interface = NULL;

2171

while((interface = argz_next(interfaces, interfaces_size,

2172

interface))){

2173

bool interface_was_up = interface_is_up(interface);

2174

ret = bring_up_interface(interface, delay);

2175

if(not interface_was_up){

2176

if(ret != 0){

2177

errno = ret;

2178

perror_plus("Failed to bring up interface");

2179

} else {

2180

ret_errno = argz_add(&interfaces_to_take_down,

2181

&interfaces_to_take_down_size,

2182

interface);

2183

}

2184

}

2185

}

2186

free(interfaces);

2187

interfaces = NULL;

2188

interfaces_size = 0;

2189

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

2190

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

2019

2191

}

2020

2192

}

2021

2193

2023

2195

goto end;

2024

2196

}

2025

2197

2026

ret = init_gnutls_global(pubkey, seckey);

2198

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

2027

2199

if(ret == -1){

2028

2200

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

2029

2201

exitcode = EX_UNAVAILABLE;

2046

2218

goto end;

2047

2219

}

2048

2220

2049

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

2221

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

2050

2222

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

2051

2223

exitcode = EX_UNAVAILABLE;

2052

2224

goto end;

2062

2234

/* Connect directly, do not use Zeroconf */

2063

2235

/* (Mainly meant for debugging) */

2064

2236

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

2237

2065

2238

if(address == NULL){

2066

2239

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

2067

2240

exitcode = EX_USAGE;

2072

2245

goto end;

2073

2246

}

2074

2247

2075

uint16_t port;

2248

in_port_t port;

2076

2249

errno = 0;

2077

2250

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

2078

2251

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

2079

or tmpmax != (uint16_t)tmpmax){

2252

or tmpmax != (in_port_t)tmpmax){

2080

2253

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

2081

2254

exitcode = EX_USAGE;

2082

2255

goto end;

2086

2259

goto end;

2087

2260

}

2088

2261

2089

port = (uint16_t)tmpmax;

2262

port = (in_port_t)tmpmax;

2090

2263

*address = '\0';

2091

2264

/* Colon in address indicates IPv6 */

2092

2265

int af;

2108

2281

}

2109

2282

2110

2283

while(not quit_now){

2111

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

2284

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

2285

&mc);

2112

2286

if(quit_now or ret == 0){

2113

2287

break;

2114

2288

}

2140

2314

config.publish_domain = 0;

2141

2315

2142

2316

/* Allocate a new server */

2143

mc.server = avahi_server_new(avahi_simple_poll_get

2144

(mc.simple_poll), &config, NULL,

2145

NULL, &error);

2317

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2318

&config, NULL, NULL, &ret_errno);

2146

2319

2147

2320

/* Free the Avahi configuration data */

2148

2321

avahi_server_config_free(&config);

2151

2324

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

2152

2325

if(mc.server == NULL){

2153

2326

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

2154

avahi_strerror(error));

2327

avahi_strerror(ret_errno));

2155

2328

exitcode = EX_UNAVAILABLE;

2156

2329

goto end;

2157

2330

}

2163

2336

/* Create the Avahi service browser */

2164

2337

sb = avahi_s_service_browser_new(mc.server, if_index,

2165

2338

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2166

NULL, 0, browse_callback, NULL);

2339

NULL, 0, browse_callback,

2340

(void *)&mc);

2167

2341

if(sb == NULL){

2168

2342

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

2169

2343

avahi_strerror(avahi_server_errno(mc.server)));

2181

2355

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

2182

2356

}

2183

2357

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2358

ret = avahi_loop_with_timeout(simple_poll,

2359

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

2186

2360

if(debug){

2187

2361

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

2188

2362

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

2201

2375

if(mc.server != NULL)

2202

2376

avahi_server_free(mc.server);

2203

2377

2204

if(mc.simple_poll != NULL)

2205

avahi_simple_poll_free(mc.simple_poll);

2378

if(simple_poll != NULL)

2379

avahi_simple_poll_free(simple_poll);

2206

2380

2207

2381

if(gnutls_initialized){

2208

2382

gnutls_certificate_free_credentials(mc.cred);

2225

2399

}

2226

2400

}

2227

2401

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

2402

/* Re-raise priviliges */

2232

2403

{

2233

errno = 0;

2234

ret = seteuid(0);

2235

if(ret == -1){

2236

perror_plus("seteuid");

2237

}

2238

2239

/* Take down the network interface */

2240

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

2241

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

2242

if(ret == -1){

2243

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

2245

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

2246

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

2247

if(ret == -1){

2248

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2404

raise_privileges();

2405

2406

/* Run network hooks */

2407

run_network_hooks("stop", interfaces_hooks != NULL ?

2408

interfaces_hooks : "", delay);

2409

2410

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

2411

{

2412

char *interface = NULL;

2413

while((interface=argz_next(interfaces_to_take_down,

2414

interfaces_to_take_down_size,

2415

interface))){

2416

ret_errno = take_down_interface(interface);

2417

if(ret_errno != 0){

2418

errno = ret_errno;

2419

perror_plus("Failed to take down interface");

2249

2420

}

2250

2421

}

2251

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

2252

if(ret == -1){

2253

perror_plus("close");

2422

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

2423

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

2424

" down\n");

2254

2425

}

2255

2426

}

2256

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2427

2428

lower_privileges_permanently();

2429

}

2430

2431

free(interfaces_to_take_down);

2432

free(interfaces_hooks);

2263

2433

2264

2434

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

2265

2435

if(tempdir_created){