/mandos/release : revision 314

9

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

10

*

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* Everything else is

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13

12

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*

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

16

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

55

opendir(), DIR */

56

#include <sys/stat.h> /* open(), S_ISREG */

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

58

inet_pton(), connect() */

58

inet_pton(), connect(),

59

getnameinfo() */

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60

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

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61

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

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62

*/

73

74

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

74

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

75

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

76

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

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

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

78

79

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

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80

argp_state, struct argp,

91

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argz_delete(), argz_append(),

92

93

argz_stringify(), argz_add(),

93

94

argz_count() */

95

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

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EAI_SYSTEM, gai_strerror() */

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97

95

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#ifdef __linux__

96

99

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

161

164

const char *priority;

162

165

gpgme_ctx_t ctx;

163

166

server *current_server;

167

char *interfaces;

168

size_t interfaces_size;

164

169

} mandos_context;

165

170

166

171

/* global so signal handler can reach it*/

167

172

AvahiSimplePoll *simple_poll;

168

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

169

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

170

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

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173

172

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sig_atomic_t quit_now = 0;

173

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int signal_received = 0;

181

183

perror(print_text);

182

184

}

183

185

184

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

186

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

185

187

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

186

188

va_list ap;

187

189

va_start (ap, format);

188

190

189

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

190

192

program_invocation_short_name));

191

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

193

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

192

194

}

193

195

194

196

/*

196

198

* bytes. "buffer_capacity" is how much is currently allocated,

197

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* "buffer_length" is how much is already used.

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200

*/

201

__attribute__((nonnull, warn_unused_result))

199

202

size_t incbuffer(char **buffer, size_t buffer_length,

200

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size_t buffer_capacity){

201

204

if(buffer_length + BUFFER_SIZE > buffer_capacity){

202

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

203

if(buffer == NULL){

205

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

206

if(new_buf == NULL){

207

int old_errno = errno;

208

free(*buffer);

209

errno = old_errno;

210

*buffer = NULL;

204

211

return 0;

205

212

}

213

*buffer = new_buf;

206

214

buffer_capacity += BUFFER_SIZE;

207

215

}

208

216

return buffer_capacity;

209

217

}

210

218

211

219

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

220

__attribute__((nonnull, warn_unused_result))

212

221

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

213

int af){

222

int af, server **current_server){

214

223

int ret;

215

224

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

216

225

if(new_server == NULL){

225

234

perror_plus("strdup");

226

235

return false;

227

236

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

228

242

/* Special case of first server */

229

if (mc.current_server == NULL){

243

if(*current_server == NULL){

230

244

new_server->next = new_server;

231

245

new_server->prev = new_server;

232

mc.current_server = new_server;

233

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

246

*current_server = new_server;

234

247

} else {

235

new_server->next = mc.current_server;

236

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

248

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

249

new_server->next = *current_server;

250

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

237

251

new_server->prev->next = new_server;

238

mc.current_server->prev = new_server;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

return false;

252

(*current_server)->prev = new_server;

244

253

}

245

254

return true;

246

255

}

248

257

/*

249

258

* Initialize GPGME.

250

259

*/

251

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

252

const char *tempdir){

260

__attribute__((nonnull, warn_unused_result))

261

static bool init_gpgme(const char * const seckey,

262

const char * const pubkey,

263

const char * const tempdir,

264

mandos_context *mc){

253

265

gpgme_error_t rc;

254

266

gpgme_engine_info_t engine_info;

255

267

256

268

/*

257

269

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

258

270

*/

259

bool import_key(const char *filename){

271

bool import_key(const char * const filename){

260

272

int ret;

261

273

int fd;

262

274

gpgme_data_t pgp_data;

274

286

return false;

275

287

}

276

288

277

rc = gpgme_op_import(mc.ctx, pgp_data);

289

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

278

290

if(rc != GPG_ERR_NO_ERROR){

279

291

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

280

292

gpgme_strsource(rc), gpgme_strerror(rc));

324

336

}

325

337

326

338

/* Create new GPGME "context" */

327

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

339

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

328

340

if(rc != GPG_ERR_NO_ERROR){

329

341

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

330

342

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

343

355

* Decrypt OpenPGP data.

344

356

* Returns -1 on error

345

357

*/

358

__attribute__((nonnull, warn_unused_result))

346

359

static ssize_t pgp_packet_decrypt(const char *cryptotext,

347

360

size_t crypto_size,

348

char **plaintext){

361

char **plaintext,

362

mandos_context *mc){

349

363

gpgme_data_t dh_crypto, dh_plain;

350

364

gpgme_error_t rc;

351

365

ssize_t ret;

377

391

378

392

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

379

393

data buffer */

380

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

394

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

381

395

if(rc != GPG_ERR_NO_ERROR){

382

396

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

383

397

gpgme_strsource(rc), gpgme_strerror(rc));

384

398

plaintext_length = -1;

385

399

if(debug){

386

400

gpgme_decrypt_result_t result;

387

result = gpgme_op_decrypt_result(mc.ctx);

401

result = gpgme_op_decrypt_result(mc->ctx);

388

402

if(result == NULL){

389

403

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

390

404

} else {

467

481

return plaintext_length;

468

482

}

469

483

470

static const char * safer_gnutls_strerror(int value){

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

471

486

const char *ret = gnutls_strerror(value);

472

487

if(ret == NULL)

473

488

ret = "(unknown)";

475

490

}

476

491

477

492

/* GnuTLS log function callback */

493

__attribute__((nonnull))

478

494

static void debuggnutls(__attribute__((unused)) int level,

479

495

const char* string){

480

496

fprintf_plus(stderr, "GnuTLS: %s", string);

481

497

}

482

498

499

__attribute__((nonnull, warn_unused_result))

483

500

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename){

501

const char *seckeyfilename,

502

mandos_context *mc){

485

503

int ret;

486

504

487

505

if(debug){

504

522

}

505

523

506

524

/* OpenPGP credentials */

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

525

ret = gnutls_certificate_allocate_credentials(&mc->cred);

508

526

if(ret != GNUTLS_E_SUCCESS){

509

527

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

510

528

safer_gnutls_strerror(ret));

520

538

}

521

539

522

540

ret = gnutls_certificate_set_openpgp_key_file

523

(mc.cred, pubkeyfilename, seckeyfilename,

541

(mc->cred, pubkeyfilename, seckeyfilename,

524

542

GNUTLS_OPENPGP_FMT_BASE64);

525

543

if(ret != GNUTLS_E_SUCCESS){

526

544

fprintf_plus(stderr,

532

550

}

533

551

534

552

/* GnuTLS server initialization */

535

ret = gnutls_dh_params_init(&mc.dh_params);

553

ret = gnutls_dh_params_init(&mc->dh_params);

536

554

if(ret != GNUTLS_E_SUCCESS){

537

555

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

556

" initialization: %s\n",

539

557

safer_gnutls_strerror(ret));

540

558

goto globalfail;

541

559

}

542

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

560

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

543

561

if(ret != GNUTLS_E_SUCCESS){

544

562

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

545

563

safer_gnutls_strerror(ret));

546

564

goto globalfail;

547

565

}

548

566

549

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

567

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

550

568

551

569

return 0;

552

570

553

571

globalfail:

554

572

555

gnutls_certificate_free_credentials(mc.cred);

573

gnutls_certificate_free_credentials(mc->cred);

556

574

gnutls_global_deinit();

557

gnutls_dh_params_deinit(mc.dh_params);

575

gnutls_dh_params_deinit(mc->dh_params);

558

576

return -1;

559

577

}

560

578

561

static int init_gnutls_session(gnutls_session_t *session){

579

__attribute__((nonnull, warn_unused_result))

580

static int init_gnutls_session(gnutls_session_t *session,

581

mandos_context *mc){

562

582

int ret;

563

583

/* GnuTLS session creation */

564

584

do {

576

596

{

577

597

const char *err;

578

598

do {

579

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

599

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

580

600

if(quit_now){

581

601

gnutls_deinit(*session);

582

602

return -1;

593

613

594

614

do {

595

615

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

596

mc.cred);

616

mc->cred);

597

617

if(quit_now){

598

618

gnutls_deinit(*session);

599

619

return -1;

609

629

/* ignore client certificate if any. */

610

630

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

611

631

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

613

633

614

634

return 0;

615

635

}

619

639

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

620

640

621

641

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

622

643

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

623

644

AvahiIfIndex if_index,

624

int af){

645

int af, mandos_context *mc){

625

646

int ret, tcp_sd = -1;

626

647

ssize_t sret;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

648

struct sockaddr_storage to;

631

649

char *buffer = NULL;

632

650

char *decrypted_buffer = NULL;

633

651

size_t buffer_length = 0;

657

675

return -1;

658

676

}

659

677

660

ret = init_gnutls_session(&session);

678

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

679

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

680

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

681

bool match = false;

682

{

683

char *interface = NULL;

684

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

685

interface))){

686

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

687

match = true;

688

break;

689

}

690

}

691

}

692

if(not match){

693

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

694

connect to the server */

695

if(debug){

696

char interface[IF_NAMESIZE];

697

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

698

perror_plus("if_indextoname");

699

} else {

700

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

701

" \"%s\"\n",

702

if_indextoname((unsigned int)if_index,

703

interface));

704

}

705

}

706

return -1;

707

}

708

}

709

710

ret = init_gnutls_session(&session, mc);

661

711

if(ret != 0){

662

712

return -1;

663

713

}

682

732

683

733

memset(&to, 0, sizeof(to));

684

734

if(af == AF_INET6){

685

to.in6.sin6_family = (sa_family_t)af;

686

ret = inet_pton(af, ip, &to.in6.sin6_addr);

735

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

736

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

687

737

} else { /* IPv4 */

688

to.in.sin_family = (sa_family_t)af;

689

ret = inet_pton(af, ip, &to.in.sin_addr);

738

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

739

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

690

740

}

691

741

if(ret < 0 ){

692

742

int e = errno;

701

751

goto mandos_end;

702

752

}

703

753

if(af == AF_INET6){

704

to.in6.sin6_port = htons(port);

705

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

706

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

707

-Wunreachable-code*/

754

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

755

if(IN6_IS_ADDR_LINKLOCAL

756

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

708

757

if(if_index == AVAHI_IF_UNSPEC){

709

758

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

710

759

" incomplete without a network interface\n");

712

761

goto mandos_end;

713

762

}

714

763

/* Set the network interface number as scope */

715

to.in6.sin6_scope_id = (uint32_t)if_index;

764

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

716

765

}

717

766

} else {

718

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

719

-Wconversion and

720

-Wunreachable-code */

767

((struct sockaddr_in *)&to)->sin_port = htons(port);

721

768

}

722

769

723

770

if(quit_now){

740

787

}

741

788

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

742

789

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

743

const char *pcret;

744

790

if(af == AF_INET6){

745

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

746

sizeof(addrstr));

791

ret = getnameinfo((struct sockaddr *)&to,

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

747

795

} else {

748

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

749

sizeof(addrstr));

796

ret = getnameinfo((struct sockaddr *)&to,

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

750

800

}

751

if(pcret == NULL){

752

perror_plus("inet_ntop");

753

} else {

754

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

755

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

756

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

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

805

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

806

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

757

807

}

758

808

}

759

809

763

813

}

764

814

765

815

if(af == AF_INET6){

766

ret = connect(tcp_sd, &to.in6, sizeof(to));

816

ret = connect(tcp_sd, (struct sockaddr *)&to,

817

sizeof(struct sockaddr_in6));

767

818

} else {

768

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

819

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

820

sizeof(struct sockaddr_in));

769

821

}

770

822

if(ret < 0){

771

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

823

if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

772

824

int e = errno;

773

825

perror_plus("connect");

774

826

errno = e;

935

987

if(buffer_length > 0){

936

988

ssize_t decrypted_buffer_size;

937

989

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

938

&decrypted_buffer);

990

&decrypted_buffer, mc);

939

991

if(decrypted_buffer_size >= 0){

940

992

941

993

written = 0;

989

1041

return retval;

990

1042

}

991

1043

1044

__attribute__((nonnull))

992

1045

static void resolve_callback(AvahiSServiceResolver *r,

993

1046

AvahiIfIndex interface,

994

1047

AvahiProtocol proto,

1002

1055

AVAHI_GCC_UNUSED AvahiStringList *txt,

1003

1056

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1004

1057

flags,

1005

AVAHI_GCC_UNUSED void* userdata){

1058

void *mc){

1006

1059

if(r == NULL){

1007

1060

return;

1008

1061

}

1020

1073

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

1021

1074

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

1022

1075

domain,

1023

avahi_strerror(avahi_server_errno(mc.server)));

1076

avahi_strerror(avahi_server_errno

1077

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

1024

1078

break;

1025

1079

1026

1080

case AVAHI_RESOLVER_FOUND:

1034

1088

}

1035

1089

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

1036

1090

interface,

1037

avahi_proto_to_af(proto));

1091

avahi_proto_to_af(proto),

1092

mc);

1038

1093

if(ret == 0){

1039

1094

avahi_simple_poll_quit(simple_poll);

1040

1095

} else {

1041

1096

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

1042

avahi_proto_to_af(proto))){

1097

avahi_proto_to_af(proto),

1098

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

1043

1099

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

1044

1100

" list\n", name);

1045

1101

}

1058

1114

const char *domain,

1059

1115

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1060

1116

flags,

1061

AVAHI_GCC_UNUSED void* userdata){

1117

void *mc){

1062

1118

if(b == NULL){

1063

1119

return;

1064

1120

}

1075

1131

case AVAHI_BROWSER_FAILURE:

1076

1132

1077

1133

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

1078

avahi_strerror(avahi_server_errno(mc.server)));

1134

avahi_strerror(avahi_server_errno

1135

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

1079

1136

avahi_simple_poll_quit(simple_poll);

1080

1137

return;

1081

1138

1085

1142

the callback function is called the Avahi server will free the

1086

1143

resolver for us. */

1087

1144

1088

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

1089

name, type, domain, protocol, 0,

1090

resolve_callback, NULL) == NULL)

1145

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

1146

interface, protocol, name, type,

1147

domain, protocol, 0,

1148

resolve_callback, mc) == NULL)

1091

1149

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

1092

1150

" %s\n", name,

1093

avahi_strerror(avahi_server_errno(mc.server)));

1151

avahi_strerror(avahi_server_errno

1152

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

1094

1153

break;

1095

1154

1096

1155

case AVAHI_BROWSER_REMOVE:

1121

1180

errno = old_errno;

1122

1181

}

1123

1182

1183

__attribute__((nonnull, warn_unused_result))

1124

1184

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

1125

1185

int ret;

1126

1186

error_t ret_errno;

1145

1205

return true;

1146

1206

}

1147

1207

1208

__attribute__((nonnull, warn_unused_result))

1148

1209

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

1149

1210

1150

1211

/* Reject the loopback device */

1192

1253

* corresponds to an acceptable network device.

1193

1254

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

1194

1255

*/

1256

__attribute__((nonnull, warn_unused_result))

1195

1257

int good_interface(const struct dirent *if_entry){

1196

1258

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

1197

1259

return 0;

1215

1277

/*

1216

1278

* This function determines if a network interface is up.

1217

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1218

1281

bool interface_is_up(const char *interface){

1219

1282

struct ifreq ifr;

1220

1283

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

1231

1294

/*

1232

1295

* This function determines if a network interface is running

1233

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1234

1298

bool interface_is_running(const char *interface){

1235

1299

struct ifreq ifr;

1236

1300

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

1244

1308

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

1245

1309

}

1246

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1247

1312

int notdotentries(const struct dirent *direntry){

1248

1313

/* Skip "." and ".." */

1249

1314

if(direntry->d_name[0] == '.'

1256

1321

}

1257

1322

1258

1323

/* Is this directory entry a runnable program? */

1324

__attribute__((nonnull, warn_unused_result))

1259

1325

int runnable_hook(const struct dirent *direntry){

1260

1326

int ret;

1261

1327

size_t sret;

1316

1382

return 1;

1317

1383

}

1318

1384

1319

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1385

__attribute__((nonnull, warn_unused_result))

1386

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1387

mandos_context *mc){

1320

1388

int ret;

1321

1389

struct timespec now;

1322

1390

struct timespec waited_time;

1323

1391

intmax_t block_time;

1324

1392

1325

1393

while(true){

1326

if(mc.current_server == NULL){

1327

if (debug){

1394

if(mc->current_server == NULL){

1395

if(debug){

1328

1396

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

1329

1397

" No timeout!\n");

1330

1398

}

1331

1399

ret = avahi_simple_poll_iterate(s, -1);

1332

1400

} else {

1333

if (debug){

1401

if(debug){

1334

1402

fprintf_plus(stderr, "Check current_server if we should run"

1335

1403

" it, or wait\n");

1336

1404

}

1343

1411

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

1344

1412

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

1345

1413

waited_time.tv_sec = (now.tv_sec

1346

- mc.current_server->last_seen.tv_sec);

1414

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

1347

1415

waited_time.tv_nsec = (now.tv_nsec

1348

- mc.current_server->last_seen.tv_nsec);

1416

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

1349

1417

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

1350

1418

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

1351

1419

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

1353

1421

- ((intmax_t)waited_time.tv_sec * 1000))

1354

1422

- ((intmax_t)waited_time.tv_nsec / 1000000));

1355

1423

1356

if (debug){

1424

if(debug){

1357

1425

fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",

1358

1426

block_time);

1359

1427

}

1360

1428

1361

1429

if(block_time <= 0){

1362

ret = start_mandos_communication(mc.current_server->ip,

1363

mc.current_server->port,

1364

mc.current_server->if_index,

1365

mc.current_server->af);

1430

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

1431

mc->current_server->port,

1432

mc->current_server->if_index,

1433

mc->current_server->af, mc);

1366

1434

if(ret == 0){

1367

avahi_simple_poll_quit(simple_poll);

1435

avahi_simple_poll_quit(s);

1368

1436

return 0;

1369

1437

}

1370

1438

ret = clock_gettime(CLOCK_MONOTONIC,

1371

&mc.current_server->last_seen);

1439

&mc->current_server->last_seen);

1372

1440

if(ret == -1){

1373

1441

perror_plus("clock_gettime");

1374

1442

return -1;

1375

1443

}

1376

mc.current_server = mc.current_server->next;

1444

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

1377

1445

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

1378

1446

servers, but don't block */

1379

1447

}

1381

1449

ret = avahi_simple_poll_iterate(s, (int)block_time);

1382

1450

}

1383

1451

if(ret != 0){

1384

if (ret > 0 or errno != EINTR){

1452

if(ret > 0 or errno != EINTR){

1385

1453

return (ret != 1) ? ret : 0;

1386

1454

}

1387

1455

}

1389

1457

}

1390

1458

1391

1459

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

1460

__attribute__((warn_unused_result))

1392

1461

error_t raise_privileges(void){

1393

1462

error_t old_errno = errno;

1394

1463

error_t ret_errno = 0;

1401

1470

}

1402

1471

1403

1472

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

1473

__attribute__((warn_unused_result))

1404

1474

error_t raise_privileges_permanently(void){

1405

1475

error_t old_errno = errno;

1406

1476

error_t ret_errno = raise_privileges();

1417

1487

}

1418

1488

1419

1489

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

1490

__attribute__((warn_unused_result))

1420

1491

error_t lower_privileges(void){

1421

1492

error_t old_errno = errno;

1422

1493

error_t ret_errno = 0;

1429

1500

}

1430

1501

1431

1502

/* Lower privileges permanently */

1503

__attribute__((warn_unused_result))

1432

1504

error_t lower_privileges_permanently(void){

1433

1505

error_t old_errno = errno;

1434

1506

error_t ret_errno = 0;

1440

1512

return ret_errno;

1441

1513

}

1442

1514

1443

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

1515

__attribute__((nonnull))

1516

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

1444

1517

const float delay){

1445

1518

struct dirent **direntries;

1446

struct dirent *direntry;

1447

int ret;

1448

1519

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

1449

1520

alphasort);

1450

1521

if(numhooks == -1){

1457

1528

perror_plus("scandir");

1458

1529

}

1459

1530

} else {

1531

struct dirent *direntry;

1532

int ret;

1460

1533

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

1461

1534

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

1462

1535

direntry = direntries[i];

1474

1547

if(hook_pid == 0){

1475

1548

/* Child */

1476

1549

/* Raise privileges */

1477

raise_privileges_permanently();

1550

if(raise_privileges_permanently() != 0){

1551

perror_plus("Failed to raise privileges");

1552

_exit(EX_NOPERM);

1553

}

1478

1554

/* Set group */

1479

1555

errno = 0;

1480

1556

ret = setgid(0);

1481

1557

if(ret == -1){

1482

1558

perror_plus("setgid");

1559

_exit(EX_NOPERM);

1483

1560

}

1484

1561

/* Reset supplementary groups */

1485

1562

errno = 0;

1486

1563

ret = setgroups(0, NULL);

1487

1564

if(ret == -1){

1488

1565

perror_plus("setgroups");

1489

}

1490

dup2(devnull, STDIN_FILENO);

1491

close(devnull);

1492

dup2(STDERR_FILENO, STDOUT_FILENO);

1566

_exit(EX_NOPERM);

1567

}

1568

ret = dup2(devnull, STDIN_FILENO);

1569

if(ret == -1){

1570

perror_plus("dup2(devnull, STDIN_FILENO)");

1571

_exit(EX_OSERR);

1572

}

1573

ret = close(devnull);

1574

if(ret == -1){

1575

perror_plus("close");

1576

_exit(EX_OSERR);

1577

}

1578

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1579

if(ret == -1){

1580

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1581

_exit(EX_OSERR);

1582

}

1493

1583

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1494

1584

if(ret == -1){

1495

1585

perror_plus("setenv");

1511

1601

_exit(EX_OSERR);

1512

1602

}

1513

1603

char *delaystring;

1514

ret = asprintf(&delaystring, "%f", delay);

1604

ret = asprintf(&delaystring, "%f", (double)delay);

1515

1605

if(ret == -1){

1516

1606

perror_plus("asprintf");

1517

1607

_exit(EX_OSERR);

1570

1660

}

1571

1661

close(devnull);

1572

1662

}

1573

return true;

1574

1663

}

1575

1664

1665

__attribute__((nonnull, warn_unused_result))

1576

1666

error_t bring_up_interface(const char *const interface,

1577

1667

const float delay){

1578

int sd = -1;

1579

1668

error_t old_errno = errno;

1580

error_t ret_errno = 0;

1581

int ret, ret_setflags;

1669

int ret;

1582

1670

struct ifreq network;

1583

1671

unsigned int if_index = if_nametoindex(interface);

1584

1672

if(if_index == 0){

1593

1681

}

1594

1682

1595

1683

if(not interface_is_up(interface)){

1596

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

1684

error_t ret_errno = 0, ioctl_errno = 0;

1685

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

1597

1686

ret_errno = errno;

1598

1687

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

1599

1688

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

1689

errno = old_errno;

1600

1690

return ret_errno;

1601

1691

}

1602

network.ifr_flags |= IFF_UP;

1692

network.ifr_flags |= IFF_UP; /* set flag */

1603

1693

1604

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1605

if(sd < 0){

1694

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

1695

if(sd == -1){

1606

1696

ret_errno = errno;

1607

1697

perror_plus("socket");

1608

1698

errno = old_errno;

1609

1699

return ret_errno;

1610

1700

}

1611

1701

1612

1702

if(quit_now){

1613

close(sd);

1703

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

1704

if(ret == -1){

1705

perror_plus("close");

1706

}

1614

1707

errno = old_errno;

1615

1708

return EINTR;

1616

1709

}

1620

1713

interface);

1621

1714

}

1622

1715

1623

/* Raise priviliges */

1624

raise_privileges();

1716

/* Raise privileges */

1717

ret_errno = raise_privileges();

1718

if(ret_errno != 0){

1719

perror_plus("Failed to raise privileges");

1720

}

1625

1721

1626

1722

#ifdef __linux__

1627

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1628

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

1629

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

1630

bool restore_loglevel = true;

1631

if(ret_linux == -1){

1632

restore_loglevel = false;

1633

perror_plus("klogctl");

1723

int ret_linux;

1724

bool restore_loglevel = false;

1725

if(ret_errno == 0){

1726

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1727

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

1728

ret_linux = klogctl(8, NULL, 5);

1729

if(ret_linux == -1){

1730

perror_plus("klogctl");

1731

} else {

1732

restore_loglevel = true;

1733

}

1634

1734

}

1635

1735

#endif /* __linux__ */

1636

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

1637

ret_errno = errno;

1736

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

1737

ioctl_errno = errno;

1638

1738

#ifdef __linux__

1639

1739

if(restore_loglevel){

1640

1740

ret_linux = klogctl(7, NULL, 0);

1644

1744

}

1645

1745

#endif /* __linux__ */

1646

1746

1647

/* Lower privileges */

1648

lower_privileges();

1747

/* If raise_privileges() succeeded above */

1748

if(ret_errno == 0){

1749

/* Lower privileges */

1750

ret_errno = lower_privileges();

1751

if(ret_errno != 0){

1752

errno = ret_errno;

1753

perror_plus("Failed to lower privileges");

1754

}

1755

}

1649

1756

1650

1757

/* Close the socket */

1651

1758

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

1654

1761

}

1655

1762

1656

1763

if(ret_setflags == -1){

1657

errno = ret_errno;

1764

errno = ioctl_errno;

1658

1765

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1659

1766

errno = old_errno;

1660

return ret_errno;

1767

return ioctl_errno;

1661

1768

}

1662

1769

} else if(debug){

1663

1770

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

1681

1788

return 0;

1682

1789

}

1683

1790

1791

__attribute__((nonnull, warn_unused_result))

1684

1792

error_t take_down_interface(const char *const interface){

1685

int sd = -1;

1686

1793

error_t old_errno = errno;

1687

error_t ret_errno = 0;

1688

int ret, ret_setflags;

1689

1794

struct ifreq network;

1690

1795

unsigned int if_index = if_nametoindex(interface);

1691

1796

if(if_index == 0){

1694

1799

return ENXIO;

1695

1800

}

1696

1801

if(interface_is_up(interface)){

1802

error_t ret_errno = 0, ioctl_errno = 0;

1697

1803

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

1698

1804

ret_errno = errno;

1699

1805

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

1700

1806

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

1807

errno = old_errno;

1701

1808

return ret_errno;

1702

1809

}

1703

1810

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

1704

1811

1705

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1706

if(sd < 0){

1812

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

1813

if(sd == -1){

1707

1814

ret_errno = errno;

1708

1815

perror_plus("socket");

1709

1816

errno = old_errno;

1715

1822

interface);

1716

1823

}

1717

1824

1718

/* Raise priviliges */

1719

raise_privileges();

1720

1721

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

1722

ret_errno = errno;

1723

1724

/* Lower privileges */

1725

lower_privileges();

1825

/* Raise privileges */

1826

ret_errno = raise_privileges();

1827

if(ret_errno != 0){

1828

perror_plus("Failed to raise privileges");

1829

}

1830

1831

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

1832

ioctl_errno = errno;

1833

1834

/* If raise_privileges() succeeded above */

1835

if(ret_errno == 0){

1836

/* Lower privileges */

1837

ret_errno = lower_privileges();

1838

if(ret_errno != 0){

1839

errno = ret_errno;

1840

perror_plus("Failed to lower privileges");

1841

}

1842

}

1726

1843

1727

1844

/* Close the socket */

1728

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

1845

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

1729

1846

if(ret == -1){

1730

1847

perror_plus("close");

1731

1848

}

1732

1849

1733

1850

if(ret_setflags == -1){

1734

errno = ret_errno;

1851

errno = ioctl_errno;

1735

1852

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1736

1853

errno = old_errno;

1737

return ret_errno;

1854

return ioctl_errno;

1738

1855

}

1739

1856

} else if(debug){

1740

1857

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

1746

1863

}

1747

1864

1748

1865

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

1866

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

1867

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

1868

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

1869

.interfaces = NULL, .interfaces_size = 0 };

1749

1870

AvahiSServiceBrowser *sb = NULL;

1750

1871

error_t ret_errno;

1751

1872

int ret;

1752

1873

intmax_t tmpmax;

1753

1874

char *tmp;

1754

1875

int exitcode = EXIT_SUCCESS;

1755

char *interfaces = NULL;

1756

size_t interfaces_size = 0;

1757

1876

char *interfaces_to_take_down = NULL;

1758

1877

size_t interfaces_to_take_down_size = 0;

1759

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

1760

bool tempdir_created = false;

1878

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

1879

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

1880

char *tempdir = NULL;

1761

1881

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1762

1882

const char *seckey = PATHDIR "/" SECKEY;

1763

1883

const char *pubkey = PATHDIR "/" PUBKEY;

1764

1884

char *interfaces_hooks = NULL;

1765

size_t interfaces_hooks_size = 0;

1766

1885

1767

1886

bool gnutls_initialized = false;

1768

1887

bool gpgme_initialized = false;

1859

1978

connect_to = arg;

1860

1979

break;

1861

1980

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

1862

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

1863

(int)',');

1981

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

1982

arg, (int)',');

1864

1983

if(ret_errno != 0){

1865

1984

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

1866

1985

}

1946

2065

/* Work around Debian bug #633582:

1947

2066

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

1948

2067

1949

/* Re-raise priviliges */

1950

if(raise_privileges() == 0){

2068

/* Re-raise privileges */

2069

ret_errno = raise_privileges();

2070

if(ret_errno != 0){

2071

errno = ret_errno;

2072

perror_plus("Failed to raise privileges");

2073

} else {

1951

2074

struct stat st;

1952

2075

1953

2076

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

1993

2116

}

1994

2117

1995

2118

/* Lower privileges */

1996

errno = 0;

1997

ret = seteuid(uid);

1998

if(ret == -1){

1999

perror_plus("seteuid");

2119

ret_errno = lower_privileges();

2120

if(ret_errno != 0){

2121

errno = ret_errno;

2122

perror_plus("Failed to lower privileges");

2000

2123

}

2001

2124

}

2002

2125

}

2003

2126

2004

/* Remove empty interface names */

2127

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

2005

2128

{

2006

2129

char *interface = NULL;

2007

while((interface = argz_next(interfaces, interfaces_size,

2130

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

2008

2131

interface))){

2009

if(if_nametoindex(interface) == 0){

2010

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

2132

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

2133

and if_nametoindex(interface) == 0){

2134

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

2011

2135

fprintf_plus(stderr, "Not using nonexisting interface"

2012

2136

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

2013

2137

}

2014

argz_delete(&interfaces, &interfaces_size, interface);

2138

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

2015

2139

interface = NULL;

2016

2140

}

2017

2141

}

2019

2143

2020

2144

/* Run network hooks */

2021

2145

{

2022

2023

if(interfaces != NULL){

2024

interfaces_hooks = malloc(interfaces_size);

2146

if(mc.interfaces != NULL){

2147

interfaces_hooks = malloc(mc.interfaces_size);

2025

2148

if(interfaces_hooks == NULL){

2026

2149

perror_plus("malloc");

2027

2150

goto end;

2028

2151

}

2029

memcpy(interfaces_hooks, interfaces, interfaces_size);

2030

interfaces_hooks_size = interfaces_size;

2031

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2032

(int)',');

2033

}

2034

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

2035

interfaces_hooks : "", delay)){

2036

goto end;

2037

}

2152

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

2153

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

2154

}

2155

run_network_hooks("start", interfaces_hooks != NULL ?

2156

interfaces_hooks : "", delay);

2038

2157

}

2039

2158

2040

2159

if(not debug){

2117

2236

}

2118

2237

2119

2238

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

2120

if(interfaces == NULL){

2239

if(mc.interfaces == NULL){

2121

2240

struct dirent **direntries;

2122

2241

/* Look for any good interfaces */

2123

2242

ret = scandir(sys_class_net, &direntries, good_interface,

2125

2244

if(ret >= 1){

2126

2245

/* Add all found interfaces to interfaces list */

2127

2246

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

2128

ret_errno = argz_add(&interfaces, &interfaces_size,

2247

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

2129

2248

direntries[i]->d_name);

2130

2249

if(ret_errno != 0){

2250

errno = ret_errno;

2131

2251

perror_plus("argz_add");

2132

2252

continue;

2133

2253

}

2145

2265

}

2146

2266

}

2147

2267

2148

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

2149

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

2150

if(debug){

2151

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

2152

interfaces);

2153

}

2154

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2155

}

2156

2157

/* Bring up interfaces which are down */

2158

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

2159

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

2268

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

2269

{

2160

2270

char *interface = NULL;

2161

while((interface = argz_next(interfaces, interfaces_size,

2271

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

2162

2272

interface))){

2273

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

2274

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

2275

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

2276

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

2277

interface);

2278

interface = NULL;

2279

while((interface = argz_next(mc.interfaces,

2280

mc.interfaces_size, interface))){

2281

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

2282

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

2283

interface);

2284

interface = NULL;

2285

}

2286

}

2287

break;

2288

}

2163

2289

bool interface_was_up = interface_is_up(interface);

2164

ret = bring_up_interface(interface, delay);

2290

errno = bring_up_interface(interface, delay);

2165

2291

if(not interface_was_up){

2166

if(ret != 0){

2167

errno = ret;

2292

if(errno != 0){

2168

2293

perror_plus("Failed to bring up interface");

2169

2294

} else {

2170

ret_errno = argz_add(&interfaces_to_take_down,

2171

&interfaces_to_take_down_size,

2172

interface);

2295

errno = argz_add(&interfaces_to_take_down,

2296

&interfaces_to_take_down_size,

2297

interface);

2298

if(errno != 0){

2299

perror_plus("argz_add");

2300

}

2173

2301

}

2174

2302

}

2175

2303

}

2176

free(interfaces);

2177

interfaces = NULL;

2178

interfaces_size = 0;

2179

2304

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

2180

2305

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

2181

2306

}

2182

2307

}

2183

2308

2309

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

2310

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

2311

if(debug){

2312

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

2313

mc.interfaces);

2314

}

2315

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

2316

}

2317

2184

2318

if(quit_now){

2185

2319

goto end;

2186

2320

}

2187

2321

2188

ret = init_gnutls_global(pubkey, seckey);

2322

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

2189

2323

if(ret == -1){

2190

2324

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

2191

2325

exitcode = EX_UNAVAILABLE;

2198

2332

goto end;

2199

2333

}

2200

2334

2201

if(mkdtemp(tempdir) == NULL){

2335

/* Try /run/tmp before /tmp */

2336

tempdir = mkdtemp(run_tempdir);

2337

if(tempdir == NULL and errno == ENOENT){

2338

if(debug){

2339

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2340

run_tempdir, old_tempdir);

2341

}

2342

tempdir = mkdtemp(old_tempdir);

2343

}

2344

if(tempdir == NULL){

2202

2345

perror_plus("mkdtemp");

2203

2346

goto end;

2204

2347

}

2205

tempdir_created = true;

2206

2348

2207

2349

if(quit_now){

2208

2350

goto end;

2209

2351

}

2210

2352

2211

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

2353

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

2212

2354

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

2213

2355

exitcode = EX_UNAVAILABLE;

2214

2356

goto end;

2244

2386

exitcode = EX_USAGE;

2245

2387

goto end;

2246

2388

}

2247

2389

2248

2390

if(quit_now){

2249

2391

goto end;

2250

2392

}

2271

2413

}

2272

2414

2273

2415

while(not quit_now){

2274

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

2416

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

2417

&mc);

2275

2418

if(quit_now or ret == 0){

2276

2419

break;

2277

2420

}

2279

2422

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

2280

2423

(int)retry_interval);

2281

2424

}

2282

sleep((int)retry_interval);

2425

sleep((unsigned int)retry_interval);

2283

2426

}

2284

2427

2285

if (not quit_now){

2428

if(not quit_now){

2286

2429

exitcode = EXIT_SUCCESS;

2287

2430

}

2288

2431

2325

2468

/* Create the Avahi service browser */

2326

2469

sb = avahi_s_service_browser_new(mc.server, if_index,

2327

2470

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2328

NULL, 0, browse_callback, NULL);

2471

NULL, 0, browse_callback,

2472

(void *)&mc);

2329

2473

if(sb == NULL){

2330

2474

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

2331

2475

avahi_strerror(avahi_server_errno(mc.server)));

2344

2488

}

2345

2489

2346

2490

ret = avahi_loop_with_timeout(simple_poll,

2347

(int)(retry_interval * 1000));

2491

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

2348

2492

if(debug){

2349

2493

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

2350

2494

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

2357

2501

}

2358

2502

2359

2503

/* Cleanup things */

2504

free(mc.interfaces);

2505

2360

2506

if(sb != NULL)

2361

2507

avahi_s_service_browser_free(sb);

2362

2508

2387

2533

}

2388

2534

}

2389

2535

2390

/* Re-raise priviliges */

2536

/* Re-raise privileges */

2391

2537

{

2392

raise_privileges();

2393

2394

/* Run network hooks */

2395

run_network_hooks("stop", interfaces_hooks != NULL ?

2396

interfaces_hooks : "", delay);

2397

2398

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

2399

{

2400

char *interface = NULL;

2401

while((interface=argz_next(interfaces_to_take_down,

2402

interfaces_to_take_down_size,

2403

interface))){

2404

ret_errno = take_down_interface(interface);

2405

if(ret_errno != 0){

2406

errno = ret_errno;

2407

perror_plus("Failed to take down interface");

2408

}

2409

}

2410

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

2411

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

2412

" down\n");

2413

}

2414

}

2415

2416

lower_privileges_permanently();

2538

ret_errno = raise_privileges();

2539

if(ret_errno != 0){

2540

perror_plus("Failed to raise privileges");

2541

} else {

2542

2543

/* Run network hooks */

2544

run_network_hooks("stop", interfaces_hooks != NULL ?

2545

interfaces_hooks : "", delay);

2546

2547

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

2548

{

2549

char *interface = NULL;

2550

while((interface=argz_next(interfaces_to_take_down,

2551

interfaces_to_take_down_size,

2552

interface))){

2553

ret_errno = take_down_interface(interface);

2554

if(ret_errno != 0){

2555

errno = ret_errno;

2556

perror_plus("Failed to take down interface");

2557

}

2558

}

2559

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

2560

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

2561

" down\n");

2562

}

2563

}

2564

}

2565

2566

ret_errno = lower_privileges_permanently();

2567

if(ret_errno != 0){

2568

perror_plus("Failed to lower privileges permanently");

2569

}

2417

2570

}

2418

2571

2419

2572

free(interfaces_to_take_down);

2420

2573

free(interfaces_hooks);

2421

2574

2422

2575

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

2423

if(tempdir_created){

2576

if(tempdir != NULL){

2424

2577

struct dirent **direntries = NULL;

2425

2578

struct dirent *direntry = NULL;

2426

2579

int numentries = scandir(tempdir, &direntries, notdotentries,

2427

2580

alphasort);

2428

if (numentries > 0){

2581

if(numentries > 0){

2429

2582

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

2430

2583

direntry = direntries[i];

2431

2584

char *fullname = NULL;

2446

2599

2447

2600

/* need to clean even if 0 because man page doesn't specify */

2448

2601

free(direntries);

2449

if (numentries == -1){

2602

if(numentries == -1){

2450

2603

perror_plus("scandir");

2451

2604

}

2452

2605

ret = rmdir(tempdir);