/mandos/trunk : revision 505.3.24

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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*

15

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

16

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

41

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

43

stdout, ferror(), remove() */

44

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

44

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

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

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

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strtof(), abort() */

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opendir(), DIR */

56

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

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

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inet_pton(), connect(),

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getnameinfo() */

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inet_pton(), connect() */

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

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

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61

*/

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

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

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

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

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

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

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

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

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argp_state, struct argp,

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

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WEXITSTATUS(), WTERMSIG() */

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

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#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() */

95

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

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EAI_SYSTEM, gai_strerror() */

97

91

98

92

#ifdef __linux__

99

93

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

141

135

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

142

136

char *connect_to = NULL;

143

137

const char *hookdir = HOOKDIR;

144

uid_t uid = 65534;

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gid_t gid = 65534;

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138

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

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typedef struct server{

149

141

const char *ip;

150

in_port_t port;

142

uint16_t port;

151

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AvahiIfIndex if_index;

152

144

int af;

153

145

struct timespec last_seen;

157

149

158

150

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

159

151

typedef struct {

152

AvahiSimplePoll *simple_poll;

160

153

AvahiServer *server;

161

154

gnutls_certificate_credentials_t cred;

162

155

unsigned int dh_bits;

164

157

const char *priority;

165

158

gpgme_ctx_t ctx;

166

159

server *current_server;

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char *interfaces;

168

size_t interfaces_size;

169

160

} mandos_context;

170

161

171

/* global so signal handler can reach it*/

172

AvahiSimplePoll *simple_poll;

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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167

174

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sig_atomic_t quit_now = 0;

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169

int signal_received = 0;

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170

177

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/* Function to use when printing errors */

178

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void perror_plus(const char *print_text){

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int e = errno;

180

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

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174

program_invocation_short_name);

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errno = e;

183

175

perror(print_text);

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}

185

177

186

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

187

178

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

188

179

va_list ap;

189

180

va_start (ap, format);

190

181

191

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

192

183

program_invocation_short_name));

193

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

184

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

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185

}

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196

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/*

201

192

size_t incbuffer(char **buffer, size_t buffer_length,

202

193

size_t buffer_capacity){

203

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

204

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

205

if(new_buf == NULL){

206

int old_errno = errno;

207

free(*buffer);

208

errno = old_errno;

209

*buffer = NULL;

195

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

196

if(buffer == NULL){

210

197

return 0;

211

198

}

212

*buffer = new_buf;

213

199

buffer_capacity += BUFFER_SIZE;

214

200

}

215

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return buffer_capacity;

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202

}

217

203

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

219

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

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int af, server **current_server){

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

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int af){

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int ret;

222

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

223

209

if(new_server == NULL){

224

210

perror_plus("malloc");

225

return false;

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return -1;

226

212

}

227

213

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

228

214

.port = port,

230

216

.af = af };

231

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if(new_server->ip == NULL){

232

218

perror_plus("strdup");

233

return false;

234

}

235

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

236

if(ret == -1){

237

perror_plus("clock_gettime");

238

return false;

219

return -1;

239

220

}

240

221

/* Special case of first server */

241

if(*current_server == NULL){

222

if (mc.current_server == NULL){

242

223

new_server->next = new_server;

243

224

new_server->prev = new_server;

244

*current_server = new_server;

225

mc.current_server = new_server;

245

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

246

227

} else {

247

new_server->next = *current_server;

248

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

228

new_server->next = mc.current_server;

229

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

249

230

new_server->prev->next = new_server;

250

(*current_server)->prev = new_server;

251

}

252

return true;

231

mc.current_server->prev = new_server;

232

}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return -1;

237

}

238

return 0;

253

239

}

254

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255

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/*

256

242

* Initialize GPGME.

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*/

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

259

const char *tempdir, mandos_context *mc){

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const char *tempdir){

260

246

gpgme_error_t rc;

261

247

gpgme_engine_info_t engine_info;

262

248

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263

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/*

264

251

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

265

252

*/

281

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return false;

282

269

}

283

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

271

rc = gpgme_op_import(mc.ctx, pgp_data);

285

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if(rc != GPG_ERR_NO_ERROR){

286

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

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gpgme_strsource(rc), gpgme_strerror(rc));

331

318

}

332

319

333

320

/* Create new GPGME "context" */

334

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

321

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

335

322

if(rc != GPG_ERR_NO_ERROR){

336

323

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

337

324

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

352

339

*/

353

340

static ssize_t pgp_packet_decrypt(const char *cryptotext,

354

341

size_t crypto_size,

355

char **plaintext,

356

mandos_context *mc){

342

char **plaintext){

357

343

gpgme_data_t dh_crypto, dh_plain;

358

344

gpgme_error_t rc;

359

345

ssize_t ret;

385

371

386

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

387

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data buffer */

388

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

374

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

389

375

if(rc != GPG_ERR_NO_ERROR){

390

376

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

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gpgme_strsource(rc), gpgme_strerror(rc));

392

378

plaintext_length = -1;

393

379

if(debug){

394

380

gpgme_decrypt_result_t result;

395

result = gpgme_op_decrypt_result(mc->ctx);

381

result = gpgme_op_decrypt_result(mc.ctx);

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382

if(result == NULL){

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

398

384

} else {

476

462

}

477

463

478

464

static const char * safer_gnutls_strerror(int value){

479

const char *ret = gnutls_strerror(value);

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

466

-Wunreachable-code */

480

467

if(ret == NULL)

481

468

ret = "(unknown)";

482

469

return ret;

489

476

}

490

477

491

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static int init_gnutls_global(const char *pubkeyfilename,

492

const char *seckeyfilename,

493

mandos_context *mc){

479

const char *seckeyfilename){

494

480

int ret;

495

481

496

482

if(debug){

513

499

}

514

500

515

501

/* OpenPGP credentials */

516

ret = gnutls_certificate_allocate_credentials(&mc->cred);

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

517

503

if(ret != GNUTLS_E_SUCCESS){

518

504

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

519

505

safer_gnutls_strerror(ret));

529

515

}

530

516

531

517

ret = gnutls_certificate_set_openpgp_key_file

532

(mc->cred, pubkeyfilename, seckeyfilename,

518

(mc.cred, pubkeyfilename, seckeyfilename,

533

519

GNUTLS_OPENPGP_FMT_BASE64);

534

520

if(ret != GNUTLS_E_SUCCESS){

535

521

fprintf_plus(stderr,

541

527

}

542

528

543

529

/* GnuTLS server initialization */

544

ret = gnutls_dh_params_init(&mc->dh_params);

530

ret = gnutls_dh_params_init(&mc.dh_params);

545

531

if(ret != GNUTLS_E_SUCCESS){

546

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

547

533

" initialization: %s\n",

548

534

safer_gnutls_strerror(ret));

549

535

goto globalfail;

550

536

}

551

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

537

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

552

538

if(ret != GNUTLS_E_SUCCESS){

553

539

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

554

540

safer_gnutls_strerror(ret));

555

541

goto globalfail;

556

542

}

557

543

558

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

544

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

559

545

560

546

return 0;

561

547

562

548

globalfail:

563

549

564

gnutls_certificate_free_credentials(mc->cred);

550

gnutls_certificate_free_credentials(mc.cred);

565

551

gnutls_global_deinit();

566

gnutls_dh_params_deinit(mc->dh_params);

552

gnutls_dh_params_deinit(mc.dh_params);

567

553

return -1;

568

554

}

569

555

570

static int init_gnutls_session(gnutls_session_t *session,

571

mandos_context *mc){

556

static int init_gnutls_session(gnutls_session_t *session){

572

557

int ret;

573

558

/* GnuTLS session creation */

574

559

do {

586

571

{

587

572

const char *err;

588

573

do {

589

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

574

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

590

575

if(quit_now){

591

576

gnutls_deinit(*session);

592

577

return -1;

603

588

604

589

do {

605

590

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

606

mc->cred);

591

mc.cred);

607

592

if(quit_now){

608

593

gnutls_deinit(*session);

609

594

return -1;

619

604

/* ignore client certificate if any. */

620

605

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

621

606

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

623

608

624

609

return 0;

625

610

}

629

614

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

630

615

631

616

/* Called when a Mandos server is found */

632

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

617

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

633

618

AvahiIfIndex if_index,

634

int af, mandos_context *mc){

619

int af){

635

620

int ret, tcp_sd = -1;

636

621

ssize_t sret;

637

struct sockaddr_storage to;

622

union {

623

struct sockaddr_in in;

624

struct sockaddr_in6 in6;

625

} to;

638

626

char *buffer = NULL;

639

627

char *decrypted_buffer = NULL;

640

628

size_t buffer_length = 0;

664

652

return -1;

665

653

}

666

654

667

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

668

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

669

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

670

bool match = false;

671

{

672

char *interface = NULL;

673

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

674

interface))){

675

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

676

match = true;

677

break;

678

}

679

}

680

}

681

if(not match){

682

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

683

connect to the server */

684

if(debug){

685

char interface[IF_NAMESIZE];

686

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

687

perror_plus("if_indextoname");

688

} else {

689

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

690

" \"%s\"\n",

691

if_indextoname((unsigned int)if_index,

692

interface));

693

}

694

}

695

return -1;

696

}

697

}

698

699

ret = init_gnutls_session(&session, mc);

655

ret = init_gnutls_session(&session);

700

656

if(ret != 0){

701

657

return -1;

702

658

}

703

659

704

660

if(debug){

705

661

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

706

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

662

PRIu16 "\n", ip, port);

707

663

}

708

664

709

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

721

677

722

678

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

723

679

if(af == AF_INET6){

724

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

725

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

680

to.in6.sin6_family = (sa_family_t)af;

681

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

726

682

} else { /* IPv4 */

727

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

728

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

683

to.in.sin_family = (sa_family_t)af;

684

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

729

685

}

730

686

if(ret < 0 ){

731

687

int e = errno;

740

696

goto mandos_end;

741

697

}

742

698

if(af == AF_INET6){

743

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

744

if(IN6_IS_ADDR_LINKLOCAL

745

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

699

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

700

-Wconversion and

701

-Wunreachable-code */

702

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

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

705

-Wunreachable-code*/

746

706

if(if_index == AVAHI_IF_UNSPEC){

747

707

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

748

708

" incomplete without a network interface\n");

750

710

goto mandos_end;

751

711

}

752

712

/* Set the network interface number as scope */

753

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

713

to.in6.sin6_scope_id = (uint32_t)if_index;

754

714

}

755

715

} else {

756

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

716

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

717

-Wconversion and

718

-Wunreachable-code */

757

719

}

758

720

759

721

if(quit_now){

767

729

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

768

730

perror_plus("if_indextoname");

769

731

} else {

770

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

771

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

732

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

733

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

772

734

}

773

735

} else {

774

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

775

ip, (uintmax_t)port);

736

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

737

ip, port);

776

738

}

777

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

778

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

741

const char *pcret;

779

742

if(af == AF_INET6){

780

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

781

sizeof(struct sockaddr_in6),

782

addrstr, sizeof(addrstr), NULL, 0,

783

NI_NUMERICHOST);

743

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

744

sizeof(addrstr));

784

745

} else {

785

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

786

sizeof(struct sockaddr_in),

787

addrstr, sizeof(addrstr), NULL, 0,

788

NI_NUMERICHOST);

746

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

747

sizeof(addrstr));

789

748

}

790

if(ret == EAI_SYSTEM){

791

perror_plus("getnameinfo");

792

} else if(ret != 0) {

793

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

794

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

795

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

749

if(pcret == NULL){

750

perror_plus("inet_ntop");

751

} else {

752

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

753

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

754

}

796

755

}

797

756

}

798

757

802

761

}

803

762

804

763

if(af == AF_INET6){

805

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

806

sizeof(struct sockaddr_in6));

764

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

807

765

} else {

808

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

809

sizeof(struct sockaddr_in));

766

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

810

767

}

811

768

if(ret < 0){

812

769

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

861

818

goto mandos_end;

862

819

}

863

820

864

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

865

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

866

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

867

gnutls_transport_set_ptr(session,

868

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

821

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

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

869

823

870

824

if(quit_now){

871

825

errno = EINTR;

976

930

if(buffer_length > 0){

977

931

ssize_t decrypted_buffer_size;

978

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

979

&decrypted_buffer, mc);

933

&decrypted_buffer);

980

934

if(decrypted_buffer_size >= 0){

981

935

982

936

written = 0;

1043

997

AVAHI_GCC_UNUSED AvahiStringList *txt,

1044

998

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1045

999

flags,

1046

void* mc){

1047

if(r == NULL){

1048

return;

1049

}

1000

AVAHI_GCC_UNUSED void* userdata){

1001

assert(r);

1050

1002

1051

1003

/* Called whenever a service has been resolved successfully or

1052

1004

timed out */

1061

1013

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

1062

1014

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

1063

1015

domain,

1064

avahi_strerror(avahi_server_errno

1065

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

1016

avahi_strerror(avahi_server_errno(mc.server)));

1066

1017

break;

1067

1018

1068

1019

case AVAHI_RESOLVER_FOUND:

1074

1025

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

1075

1026

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

1076

1027

}

1077

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

1078

interface,

1079

avahi_proto_to_af(proto),

1080

mc);

1028

int ret = start_mandos_communication(ip, port, interface,

1029

avahi_proto_to_af(proto));

1081

1030

if(ret == 0){

1082

avahi_simple_poll_quit(simple_poll);

1031

avahi_simple_poll_quit(mc.simple_poll);

1083

1032

} else {

1084

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

1085

avahi_proto_to_af(proto),

1086

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

1087

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

1088

" list\n", name);

1089

}

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

1090

1035

}

1091

1036

}

1092

1037

}

1102

1047

const char *domain,

1103

1048

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1104

1049

flags,

1105

void* mc){

1106

if(b == NULL){

1107

return;

1108

}

1050

AVAHI_GCC_UNUSED void* userdata){

1051

assert(b);

1109

1052

1110

1053

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

1111

1054

is removed from the LAN */

1119

1062

case AVAHI_BROWSER_FAILURE:

1120

1063

1121

1064

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

1122

avahi_strerror(avahi_server_errno

1123

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

1124

avahi_simple_poll_quit(simple_poll);

1065

avahi_strerror(avahi_server_errno(mc.server)));

1066

avahi_simple_poll_quit(mc.simple_poll);

1125

1067

return;

1126

1068

1127

1069

case AVAHI_BROWSER_NEW:

1130

1072

the callback function is called the Avahi server will free the

1131

1073

resolver for us. */

1132

1074

1133

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

1134

interface, protocol, name, type,

1135

domain, protocol, 0,

1136

resolve_callback, mc) == NULL)

1075

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

1076

name, type, domain, protocol, 0,

1077

resolve_callback, NULL) == NULL)

1137

1078

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

1138

1079

" %s\n", name,

1139

avahi_strerror(avahi_server_errno

1140

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1141

1081

break;

1142

1082

1143

1083

case AVAHI_BROWSER_REMOVE:

1162

1102

signal_received = sig;

1163

1103

int old_errno = errno;

1164

1104

/* set main loop to exit */

1165

if(simple_poll != NULL){

1166

avahi_simple_poll_quit(simple_poll);

1105

if(mc.simple_poll != NULL){

1106

avahi_simple_poll_quit(mc.simple_poll);

1167

1107

}

1168

1108

errno = old_errno;

1169

1109

}

1170

1110

1171

1111

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

1172

1112

int ret;

1173

error_t ret_errno;

1174

1113

1175

1114

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

1176

1115

if(s < 0){

1177

ret_errno = errno;

1178

1116

perror_plus("socket");

1179

errno = ret_errno;

1180

1117

return false;

1181

1118

}

1182

1119

strcpy(ifr->ifr_name, ifname);

1183

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1184

1121

if(ret == -1){

1185

1122

if(debug){

1186

ret_errno = errno;

1187

1123

perror_plus("ioctl SIOCGIFFLAGS");

1188

errno = ret_errno;

1189

1124

}

1190

1125

return false;

1191

1126

}

1260

1195

}

1261

1196

1262

1197

/*

1263

* This function determines if a network interface is up.

1264

*/

1265

bool interface_is_up(const char *interface){

1266

struct ifreq ifr;

1267

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

1268

if(debug){

1269

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

1270

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

1271

}

1272

return false;

1273

}

1274

1275

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

1276

}

1277

1278

/*

1279

* This function determines if a network interface is running

1280

*/

1281

bool interface_is_running(const char *interface){

1282

struct ifreq ifr;

1283

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

1284

if(debug){

1285

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

1286

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

1287

}

1288

return false;

1289

}

1290

1291

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

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;

1292

1238

}

1293

1239

1294

1240

int notdotentries(const struct dirent *direntry){

1363

1309

return 1;

1364

1310

}

1365

1311

1366

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1367

mandos_context *mc){

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1368

1313

int ret;

1369

1314

struct timespec now;

1370

1315

struct timespec waited_time;

1371

1316

intmax_t block_time;

1372

1317

1373

1318

while(true){

1374

if(mc->current_server == NULL){

1319

if(mc.current_server == NULL){

1375

1320

if (debug){

1376

1321

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

1377

1322

" No timeout!\n");

1391

1336

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

1392

1337

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

1393

1338

waited_time.tv_sec = (now.tv_sec

1394

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

1339

- mc.current_server->last_seen.tv_sec);

1395

1340

waited_time.tv_nsec = (now.tv_nsec

1396

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

1341

- mc.current_server->last_seen.tv_nsec);

1397

1342

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

1398

1343

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

1399

1344

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

1407

1352

}

1408

1353

1409

1354

if(block_time <= 0){

1410

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

1411

mc->current_server->port,

1412

mc->current_server->if_index,

1413

mc->current_server->af, mc);

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);

1414

1359

if(ret == 0){

1415

avahi_simple_poll_quit(s);

1360

avahi_simple_poll_quit(mc.simple_poll);

1416

1361

return 0;

1417

1362

}

1418

1363

ret = clock_gettime(CLOCK_MONOTONIC,

1419

&mc->current_server->last_seen);

1364

&mc.current_server->last_seen);

1420

1365

if(ret == -1){

1421

1366

perror_plus("clock_gettime");

1422

1367

return -1;

1423

1368

}

1424

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

1369

mc.current_server = mc.current_server->next;

1425

1370

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

1426

1371

servers, but don't block */

1427

1372

}

1436

1381

}

1437

1382

}

1438

1383

1439

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

1440

error_t raise_privileges(void){

1441

error_t old_errno = errno;

1442

error_t ret_errno = 0;

1443

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

1444

ret_errno = errno;

1445

perror_plus("seteuid");

1446

}

1447

errno = old_errno;

1448

return ret_errno;

1449

}

1450

1451

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

1452

error_t raise_privileges_permanently(void){

1453

error_t old_errno = errno;

1454

error_t ret_errno = raise_privileges();

1455

if(ret_errno != 0){

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

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

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

error_t lower_privileges(void){

1469

error_t old_errno = errno;

1470

error_t ret_errno = 0;

1471

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

1472

ret_errno = errno;

1473

perror_plus("seteuid");

1474

}

1475

errno = old_errno;

1476

return ret_errno;

1477

}

1478

1479

/* Lower privileges permanently */

1480

error_t lower_privileges_permanently(void){

1481

error_t old_errno = errno;

1482

error_t ret_errno = 0;

1483

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

1484

ret_errno = errno;

1485

perror_plus("setuid");

1486

}

1487

errno = old_errno;

1488

return ret_errno;

1489

}

1490

1491

1384

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

1492

1385

const float delay){

1493

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1494

1389

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

1495

1390

alphasort);

1496

1391

if(numhooks == -1){

1497

if(errno == ENOENT){

1498

if(debug){

1499

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

1500

" found\n", hookdir);

1501

}

1502

} else {

1503

perror_plus("scandir");

1504

}

1392

perror_plus("scandir");

1505

1393

} else {

1506

struct dirent *direntry;

1507

int ret;

1508

1394

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

1509

1395

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

1510

1396

direntry = direntries[i];

1522

1408

if(hook_pid == 0){

1523

1409

/* Child */

1524

1410

/* Raise privileges */

1525

raise_privileges_permanently();

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

}

1526

1422

/* Set group */

1527

1423

errno = 0;

1528

1424

ret = setgid(0);

1548

1444

perror_plus("setenv");

1549

1445

_exit(EX_OSERR);

1550

1446

}

1551

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

1447

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

1552

1448

if(ret == -1){

1553

1449

perror_plus("setenv");

1554

1450

_exit(EX_OSERR);

1571

1467

_exit(EX_OSERR);

1572

1468

}

1573

1469

free(delaystring);

1574

if(connect_to != NULL){

1575

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

1576

if(ret == -1){

1577

perror_plus("setenv");

1578

_exit(EX_OSERR);

1579

}

1580

}

1581

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

1582

perror_plus("execl");

1583

_exit(EXIT_FAILURE);

1584

}

1470

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

1471

perror_plus("execl");

1585

1472

} else {

1586

1473

int status;

1587

1474

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

1621

1508

return true;

1622

1509

}

1623

1510

1624

error_t bring_up_interface(const char *const interface,

1625

const float delay){

1626

int sd = -1;

1627

error_t old_errno = errno;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

1630

struct ifreq network;

1631

unsigned int if_index = if_nametoindex(interface);

1632

if(if_index == 0){

1633

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

1634

errno = old_errno;

1635

return ENXIO;

1636

}

1637

1638

if(quit_now){

1639

errno = old_errno;

1640

return EINTR;

1641

}

1642

1643

if(not interface_is_up(interface)){

1644

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

1645

ret_errno = errno;

1646

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

1647

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

1648

return ret_errno;

1649

}

1650

network.ifr_flags |= IFF_UP;

1651

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

1654

ret_errno = errno;

1655

perror_plus("socket");

1656

errno = old_errno;

1657

return ret_errno;

1658

}

1659

1660

if(quit_now){

1661

close(sd);

1662

errno = old_errno;

1663

return EINTR;

1664

}

1665

1666

if(debug){

1667

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

1668

interface);

1669

}

1670

1671

/* Raise priviliges */

1672

raise_privileges();

1673

1674

#ifdef __linux__

1675

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1676

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

1677

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

1678

bool restore_loglevel = true;

1679

if(ret_linux == -1){

1680

restore_loglevel = false;

1681

perror_plus("klogctl");

1682

}

1683

#endif /* __linux__ */

1684

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

1685

ret_errno = errno;

1686

#ifdef __linux__

1687

if(restore_loglevel){

1688

ret_linux = klogctl(7, NULL, 0);

1689

if(ret_linux == -1){

1690

perror_plus("klogctl");

1691

}

1692

}

1693

#endif /* __linux__ */

1694

1695

/* Lower privileges */

1696

lower_privileges();

1697

1698

/* Close the socket */

1699

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

1700

if(ret == -1){

1701

perror_plus("close");

1702

}

1703

1704

if(ret_setflags == -1){

1705

errno = ret_errno;

1706

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1707

errno = old_errno;

1708

return ret_errno;

1709

}

1710

} else if(debug){

1711

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

1712

interface);

1713

}

1714

1715

/* Sleep checking until interface is running.

1716

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

1717

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

1718

if(interface_is_running(interface)){

1719

break;

1720

}

1721

struct timespec sleeptime = { .tv_nsec = 250000000 };

1722

ret = nanosleep(&sleeptime, NULL);

1723

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

1724

perror_plus("nanosleep");

1725

}

1726

}

1727

1728

errno = old_errno;

1729

return 0;

1730

}

1731

1732

error_t take_down_interface(const char *const interface){

1733

error_t old_errno = errno;

1734

struct ifreq network;

1735

unsigned int if_index = if_nametoindex(interface);

1736

if(if_index == 0){

1737

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

1738

errno = old_errno;

1739

return ENXIO;

1740

}

1741

if(interface_is_up(interface)){

1742

error_t ret_errno = 0;

1743

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

1744

ret_errno = errno;

1745

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

1746

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

1747

return ret_errno;

1748

}

1749

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

1750

1751

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

1752

if(sd < 0){

1753

ret_errno = errno;

1754

perror_plus("socket");

1755

errno = old_errno;

1756

return ret_errno;

1757

}

1758

1759

if(debug){

1760

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

1761

interface);

1762

}

1763

1764

/* Raise priviliges */

1765

raise_privileges();

1766

1767

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

1768

ret_errno = errno;

1769

1770

/* Lower privileges */

1771

lower_privileges();

1772

1773

/* Close the socket */

1774

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

1775

if(ret == -1){

1776

perror_plus("close");

1777

}

1778

1779

if(ret_setflags == -1){

1780

errno = ret_errno;

1781

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1782

errno = old_errno;

1783

return ret_errno;

1784

}

1785

} else if(debug){

1786

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

1787

interface);

1788

}

1789

1790

errno = old_errno;

1791

return 0;

1792

}

1793

1794

1511

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

1795

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

1796

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

1797

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

1798

.interfaces = NULL, .interfaces_size = 0 };

1799

1512

AvahiSServiceBrowser *sb = NULL;

1800

error_t ret_errno;

1513

int error;

1801

1514

int ret;

1802

1515

intmax_t tmpmax;

1803

1516

char *tmp;

1804

1517

int exitcode = EXIT_SUCCESS;

1805

char *interfaces_to_take_down = NULL;

1806

size_t interfaces_to_take_down_size = 0;

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;

1807

1524

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

1808

1525

bool tempdir_created = false;

1809

1526

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1810

1527

const char *seckey = PATHDIR "/" SECKEY;

1811

1528

const char *pubkey = PATHDIR "/" PUBKEY;

1812

char *interfaces_hooks = NULL;

1813

1529

1814

1530

bool gnutls_initialized = false;

1815

1531

bool gpgme_initialized = false;

1877

1593

.group = 2 },

1878

1594

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

1879

1595

.arg = "SECONDS",

1880

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

1596

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

1881

1597

.group = 2 },

1882

1598

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

1883

1599

.arg = "DIR",

1906

1622

connect_to = arg;

1907

1623

break;

1908

1624

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

1909

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

1910

arg, (int)',');

1911

if(ret_errno != 0){

1912

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

1913

}

1625

interface = arg;

1914

1626

break;

1915

1627

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

1916

1628

seckey = arg;

1959

1671

argp_state_help(state, state->out_stream,

1960

1672

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1961

1673

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1962

1676

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

1963

1677

exit(argp_err_exit_status);

1964

1678

break;

1994

1708

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

1995

1709

1996

1710

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

1715

} else {

1998

1716

struct stat st;

1999

1717

2000

1718

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

2040

1758

}

2041

1759

2042

1760

/* Lower privileges */

2043

lower_privileges();

2044

}

2045

}

2046

2047

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

2048

{

2049

char *interface = NULL;

2050

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

2051

interface))){

2052

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

2053

and if_nametoindex(interface) == 0){

2054

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

2055

fprintf_plus(stderr, "Not using nonexisting interface"

2056

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

2057

}

2058

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

2059

interface = NULL;

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

2060

1765

}

2061

1766

}

2062

1767

}

2063

1768

2064

1769

/* Run network hooks */

2065

{

2066

if(mc.interfaces != NULL){

2067

interfaces_hooks = malloc(mc.interfaces_size);

2068

if(interfaces_hooks == NULL){

2069

perror_plus("malloc");

2070

goto end;

2071

}

2072

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

2073

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

2074

}

2075

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

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

1770

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

1771

goto end;

2079

1772

}

2080

1773

2081

1774

if(not debug){

2082

1775

avahi_set_log_function(empty_log);

2083

1776

}

2084

1777

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

2085

1810

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

2086

1811

from the signal handler */

2087

1812

/* Initialize the pseudo-RNG for Avahi */

2088

1813

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

2089

simple_poll = avahi_simple_poll_new();

2090

if(simple_poll == NULL){

1814

mc.simple_poll = avahi_simple_poll_new();

1815

if(mc.simple_poll == NULL){

2091

1816

fprintf_plus(stderr,

2092

1817

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

2093

1818

exitcode = EX_UNAVAILABLE;

2157

1882

}

2158

1883

}

2159

1884

2160

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

2161

if(mc.interfaces == NULL){

2162

struct dirent **direntries;

2163

/* Look for any good interfaces */

2164

ret = scandir(sys_class_net, &direntries, good_interface,

2165

alphasort);

2166

if(ret >= 1){

2167

/* Add all found interfaces to interfaces list */

2168

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

2169

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

2170

direntries[i]->d_name);

2171

if(ret_errno != 0){

2172

errno = ret_errno;

2173

perror_plus("argz_add");

2174

continue;

2175

}

2176

if(debug){

2177

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

2178

direntries[i]->d_name);

2179

}

2180

}

2181

free(direntries);

2182

} else {

2183

free(direntries);

2184

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

2185

exitcode = EXIT_FAILURE;

2186

goto end;

2187

}

2188

}

2189

2190

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

2191

{

2192

char *interface = NULL;

2193

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

2194

interface))){

2195

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

2196

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

2197

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

2198

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

2199

interface);

2200

interface = NULL;

2201

while((interface = argz_next(mc.interfaces,

2202

mc.interfaces_size, interface))){

2203

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

2204

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

2205

interface);

2206

interface = NULL;

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");

2207

1970

}

2208

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){

2209

1989

break;

2210

1990

}

2211

bool interface_was_up = interface_is_up(interface);

2212

ret = bring_up_interface(interface, delay);

2213

if(not interface_was_up){

2214

if(ret != 0){

2215

errno = ret;

2216

perror_plus("Failed to bring up interface");

2217

} else {

2218

ret_errno = argz_add(&interfaces_to_take_down,

2219

&interfaces_to_take_down_size,

2220

interface);

2221

if(ret_errno != 0){

2222

errno = ret_errno;

2223

perror_plus("argz_add");

2224

}

2225

}

2226

}

2227

}

2228

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

2229

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

2230

}

2231

}

2232

2233

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

2234

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

2235

if(debug){

2236

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

2237

mc.interfaces);

2238

}

2239

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

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");

2019

}

2240

2020

}

2241

2021

2242

2022

if(quit_now){

2243

2023

goto end;

2244

2024

}

2245

2025

2246

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

2026

ret = init_gnutls_global(pubkey, seckey);

2247

2027

if(ret == -1){

2248

2028

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

2249

2029

exitcode = EX_UNAVAILABLE;

2266

2046

goto end;

2267

2047

}

2268

2048

2269

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

2049

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

2270

2050

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

2271

2051

exitcode = EX_UNAVAILABLE;

2272

2052

goto end;

2282

2062

/* Connect directly, do not use Zeroconf */

2283

2063

/* (Mainly meant for debugging) */

2284

2064

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

2285

2286

2065

if(address == NULL){

2287

2066

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

2288

2067

exitcode = EX_USAGE;

2293

2072

goto end;

2294

2073

}

2295

2074

2296

in_port_t port;

2075

uint16_t port;

2297

2076

errno = 0;

2298

2077

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

2299

2078

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

2300

or tmpmax != (in_port_t)tmpmax){

2079

or tmpmax != (uint16_t)tmpmax){

2301

2080

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

2302

2081

exitcode = EX_USAGE;

2303

2082

goto end;

2304

2083

}

2305

2084

2306

2085

if(quit_now){

2307

2086

goto end;

2308

2087

}

2309

2088

2310

port = (in_port_t)tmpmax;

2089

port = (uint16_t)tmpmax;

2311

2090

*address = '\0';

2312

2091

/* Colon in address indicates IPv6 */

2313

2092

int af;

2329

2108

}

2330

2109

2331

2110

while(not quit_now){

2332

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

2333

&mc);

2111

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

2334

2112

if(quit_now or ret == 0){

2335

2113

break;

2336

2114

}

2338

2116

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

2339

2117

(int)retry_interval);

2340

2118

}

2341

sleep((unsigned int)retry_interval);

2119

sleep((int)retry_interval);

2342

2120

}

2343

2121

2344

2122

if (not quit_now){

2362

2140

config.publish_domain = 0;

2363

2141

2364

2142

/* Allocate a new server */

2365

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2366

&config, NULL, NULL, &ret_errno);

2143

mc.server = avahi_server_new(avahi_simple_poll_get

2144

(mc.simple_poll), &config, NULL,

2145

NULL, &error);

2367

2146

2368

2147

/* Free the Avahi configuration data */

2369

2148

avahi_server_config_free(&config);

2372

2151

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

2373

2152

if(mc.server == NULL){

2374

2153

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

2375

avahi_strerror(ret_errno));

2154

avahi_strerror(error));

2376

2155

exitcode = EX_UNAVAILABLE;

2377

2156

goto end;

2378

2157

}

2384

2163

/* Create the Avahi service browser */

2385

2164

sb = avahi_s_service_browser_new(mc.server, if_index,

2386

2165

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2387

NULL, 0, browse_callback,

2388

(void *)&mc);

2166

NULL, 0, browse_callback, NULL);

2389

2167

if(sb == NULL){

2390

2168

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

2391

2169

avahi_strerror(avahi_server_errno(mc.server)));

2403

2181

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

2404

2182

}

2405

2183

2406

ret = avahi_loop_with_timeout(simple_poll,

2407

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

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2408

2186

if(debug){

2409

2187

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

2410

2188

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

2417

2195

}

2418

2196

2419

2197

/* Cleanup things */

2420

free(mc.interfaces);

2421

2422

2198

if(sb != NULL)

2423

2199

avahi_s_service_browser_free(sb);

2424

2200

2425

2201

if(mc.server != NULL)

2426

2202

avahi_server_free(mc.server);

2427

2203

2428

if(simple_poll != NULL)

2429

avahi_simple_poll_free(simple_poll);

2204

if(mc.simple_poll != NULL)

2205

avahi_simple_poll_free(mc.simple_poll);

2430

2206

2431

2207

if(gnutls_initialized){

2432

2208

gnutls_certificate_free_credentials(mc.cred);

2449

2225

}

2450

2226

}

2451

2227

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2452

2231

/* Re-raise priviliges */

2453

2232

{

2454

raise_privileges();

2455

2456

/* Run network hooks */

2457

run_network_hooks("stop", interfaces_hooks != NULL ?

2458

interfaces_hooks : "", delay);

2459

2460

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

2461

{

2462

char *interface = NULL;

2463

while((interface=argz_next(interfaces_to_take_down,

2464

interfaces_to_take_down_size,

2465

interface))){

2466

ret_errno = take_down_interface(interface);

2467

if(ret_errno != 0){

2468

errno = ret_errno;

2469

perror_plus("Failed to take down interface");

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");

2470

2249

}

2471

2250

}

2472

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

2473

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

2474

" down\n");

2251

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

2252

if(ret == -1){

2253

perror_plus("close");

2475

2254

}

2476

2255

}

2477

2478

lower_privileges_permanently();

2479

}

2480

2481

free(interfaces_to_take_down);

2482

free(interfaces_hooks);

2256

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2483

2263

2484

2264

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

2485

2265

if(tempdir_created){