/mandos/release : revision 237.7.218

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

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*

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* Everything else is

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13

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*

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

16

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

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

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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opendir(), DIR */

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#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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inet_pton(), connect(),

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getnameinfo() */

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

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

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*/

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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, inet_ntop() */

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

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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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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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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() */

90

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91

98

#ifdef __linux__

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99

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

134

141

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

135

142

char *connect_to = NULL;

136

143

const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

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gid_t gid = 65534;

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146

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

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typedef struct server{

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const char *ip;

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uint16_t port;

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in_port_t port;

142

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AvahiIfIndex if_index;

143

152

int af;

144

153

struct timespec last_seen;

148

157

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158

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

150

159

typedef struct {

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AvahiSimplePoll *simple_poll;

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160

AvahiServer *server;

153

161

gnutls_certificate_credentials_t cred;

154

162

unsigned int dh_bits;

156

164

const char *priority;

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165

gpgme_ctx_t ctx;

158

166

server *current_server;

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char *interfaces;

168

size_t interfaces_size;

159

169

} mandos_context;

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170

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/* 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 };

171

/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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173

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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176

170

177

/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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180

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

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181

program_invocation_short_name);

182

errno = e;

174

183

perror(print_text);

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184

}

176

185

186

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

177

187

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

178

188

va_list ap;

179

189

va_start (ap, format);

180

190

181

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

182

192

program_invocation_short_name));

183

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

193

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

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194

}

185

195

186

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/*

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size_t incbuffer(char **buffer, size_t buffer_length,

192

202

size_t buffer_capacity){

193

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

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

195

if(buffer == NULL){

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;

196

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return 0;

197

211

}

212

*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

199

214

}

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return buffer_capacity;

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}

202

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203

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

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

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int af){

219

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

220

int af, server **current_server){

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int ret;

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222

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

208

223

if(new_server == NULL){

209

224

perror_plus("malloc");

210

return -1;

225

return false;

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226

}

212

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

213

228

.port = port,

215

230

.af = af };

216

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if(new_server->ip == NULL){

217

232

perror_plus("strdup");

218

return -1;

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

239

}

220

240

/* Special case of first server */

221

if (mc.current_server == NULL){

241

if(*current_server == NULL){

222

242

new_server->next = new_server;

223

243

new_server->prev = new_server;

224

mc.current_server = new_server;

244

*current_server = new_server;

225

245

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

226

246

} else {

227

new_server->next = mc.current_server;

228

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

247

new_server->next = *current_server;

248

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

229

249

new_server->prev->next = new_server;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

250

(*current_server)->prev = new_server;

251

}

252

return true;

238

253

}

239

254

240

255

/*

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256

* Initialize GPGME.

242

257

*/

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

244

const char *tempdir){

259

const char *tempdir, mandos_context *mc){

245

260

gpgme_error_t rc;

246

261

gpgme_engine_info_t engine_info;

247

262

248

249

263

/*

250

264

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

251

265

*/

267

281

return false;

268

282

}

269

283

270

rc = gpgme_op_import(mc.ctx, pgp_data);

284

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

271

285

if(rc != GPG_ERR_NO_ERROR){

272

286

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

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287

gpgme_strsource(rc), gpgme_strerror(rc));

317

331

}

318

332

319

333

/* Create new GPGME "context" */

320

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

334

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

321

335

if(rc != GPG_ERR_NO_ERROR){

322

336

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

323

337

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

338

352

*/

339

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

340

354

size_t crypto_size,

341

char **plaintext){

355

char **plaintext,

356

mandos_context *mc){

342

357

gpgme_data_t dh_crypto, dh_plain;

343

358

gpgme_error_t rc;

344

359

ssize_t ret;

370

385

371

386

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

372

387

data buffer */

373

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

388

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

374

389

if(rc != GPG_ERR_NO_ERROR){

375

390

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

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gpgme_strsource(rc), gpgme_strerror(rc));

377

392

plaintext_length = -1;

378

393

if(debug){

379

394

gpgme_decrypt_result_t result;

380

result = gpgme_op_decrypt_result(mc.ctx);

395

result = gpgme_op_decrypt_result(mc->ctx);

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if(result == NULL){

382

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

383

398

} else {

461

476

}

462

477

463

478

static const char * safer_gnutls_strerror(int value){

464

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

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-Wunreachable-code */

479

const char *ret = gnutls_strerror(value);

466

480

if(ret == NULL)

467

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ret = "(unknown)";

468

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return ret;

475

489

}

476

490

477

491

static int init_gnutls_global(const char *pubkeyfilename,

478

const char *seckeyfilename){

492

const char *seckeyfilename,

493

mandos_context *mc){

479

494

int ret;

480

495

481

496

if(debug){

498

513

}

499

514

500

515

/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

516

ret = gnutls_certificate_allocate_credentials(&mc->cred);

502

517

if(ret != GNUTLS_E_SUCCESS){

503

518

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

504

519

safer_gnutls_strerror(ret));

514

529

}

515

530

516

531

ret = gnutls_certificate_set_openpgp_key_file

517

(mc.cred, pubkeyfilename, seckeyfilename,

532

(mc->cred, pubkeyfilename, seckeyfilename,

518

533

GNUTLS_OPENPGP_FMT_BASE64);

519

534

if(ret != GNUTLS_E_SUCCESS){

520

535

fprintf_plus(stderr,

526

541

}

527

542

528

543

/* GnuTLS server initialization */

529

ret = gnutls_dh_params_init(&mc.dh_params);

544

ret = gnutls_dh_params_init(&mc->dh_params);

530

545

if(ret != GNUTLS_E_SUCCESS){

531

546

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

547

" initialization: %s\n",

533

548

safer_gnutls_strerror(ret));

534

549

goto globalfail;

535

550

}

536

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

551

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

537

552

if(ret != GNUTLS_E_SUCCESS){

538

553

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

539

554

safer_gnutls_strerror(ret));

540

555

goto globalfail;

541

556

}

542

557

543

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

558

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

544

559

545

560

return 0;

546

561

547

562

globalfail:

548

563

549

gnutls_certificate_free_credentials(mc.cred);

564

gnutls_certificate_free_credentials(mc->cred);

550

565

gnutls_global_deinit();

551

gnutls_dh_params_deinit(mc.dh_params);

566

gnutls_dh_params_deinit(mc->dh_params);

552

567

return -1;

553

568

}

554

569

555

static int init_gnutls_session(gnutls_session_t *session){

570

static int init_gnutls_session(gnutls_session_t *session,

571

mandos_context *mc){

556

572

int ret;

557

573

/* GnuTLS session creation */

558

574

do {

570

586

{

571

587

const char *err;

572

588

do {

573

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

589

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

574

590

if(quit_now){

575

591

gnutls_deinit(*session);

576

592

return -1;

587

603

588

604

do {

589

605

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

590

mc.cred);

606

mc->cred);

591

607

if(quit_now){

592

608

gnutls_deinit(*session);

593

609

return -1;

603

619

/* ignore client certificate if any. */

604

620

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

605

621

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

607

623

608

624

return 0;

609

625

}

613

629

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

614

630

615

631

/* Called when a Mandos server is found */

616

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

632

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

617

633

AvahiIfIndex if_index,

618

int af){

634

int af, mandos_context *mc){

619

635

int ret, tcp_sd = -1;

620

636

ssize_t sret;

621

union {

622

struct sockaddr_in in;

623

struct sockaddr_in6 in6;

624

} to;

637

struct sockaddr_storage to;

625

638

char *buffer = NULL;

626

639

char *decrypted_buffer = NULL;

627

640

size_t buffer_length = 0;

651

664

return -1;

652

665

}

653

666

654

ret = init_gnutls_session(&session);

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

700

if(ret != 0){

656

701

return -1;

657

702

}

658

703

659

704

if(debug){

660

705

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

661

PRIu16 "\n", ip, port);

706

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

662

707

}

663

708

664

709

tcp_sd = socket(pf, SOCK_STREAM, 0);

676

721

677

722

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

678

723

if(af == AF_INET6){

679

to.in6.sin6_family = (sa_family_t)af;

680

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

724

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

725

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

681

726

} else { /* IPv4 */

682

to.in.sin_family = (sa_family_t)af;

683

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

727

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

728

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

684

729

}

685

730

if(ret < 0 ){

686

731

int e = errno;

695

740

goto mandos_end;

696

741

}

697

742

if(af == AF_INET6){

698

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

699

-Wconversion and

700

-Wunreachable-code */

701

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

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

704

-Wunreachable-code*/

743

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

744

if(IN6_IS_ADDR_LINKLOCAL

745

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

705

746

if(if_index == AVAHI_IF_UNSPEC){

706

747

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

707

748

" incomplete without a network interface\n");

709

750

goto mandos_end;

710

751

}

711

752

/* Set the network interface number as scope */

712

to.in6.sin6_scope_id = (uint32_t)if_index;

753

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

713

754

}

714

755

} else {

715

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

716

-Wconversion and

717

-Wunreachable-code */

756

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

718

757

}

719

758

720

759

if(quit_now){

728

767

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

729

768

perror_plus("if_indextoname");

730

769

} else {

731

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

732

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

770

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

771

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

733

772

}

734

773

} else {

735

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

736

ip, port);

774

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

775

ip, (uintmax_t)port);

737

776

}

738

777

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

778

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

740

const char *pcret;

741

779

if(af == AF_INET6){

742

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

743

sizeof(addrstr));

780

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

781

sizeof(struct sockaddr_in6),

782

addrstr, sizeof(addrstr), NULL, 0,

783

NI_NUMERICHOST);

744

784

} else {

745

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

746

sizeof(addrstr));

785

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

786

sizeof(struct sockaddr_in),

787

addrstr, sizeof(addrstr), NULL, 0,

788

NI_NUMERICHOST);

747

789

}

748

if(pcret == NULL){

749

perror_plus("inet_ntop");

750

} else {

751

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

752

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

753

}

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);

754

796

}

755

797

}

756

798

760

802

}

761

803

762

804

if(af == AF_INET6){

763

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

805

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

806

sizeof(struct sockaddr_in6));

764

807

} else {

765

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

808

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

809

sizeof(struct sockaddr_in));

766

810

}

767

811

if(ret < 0){

768

812

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

817

861

goto mandos_end;

818

862

}

819

863

820

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

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

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);

822

869

823

870

if(quit_now){

824

871

errno = EINTR;

929

976

if(buffer_length > 0){

930

977

ssize_t decrypted_buffer_size;

931

978

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

932

&decrypted_buffer);

979

&decrypted_buffer, mc);

933

980

if(decrypted_buffer_size >= 0){

934

981

935

982

written = 0;

996

1043

AVAHI_GCC_UNUSED AvahiStringList *txt,

997

1044

AVAHI_GCC_UNUSED AvahiLookupResultFlags

998

1045

flags,

999

AVAHI_GCC_UNUSED void* userdata){

1000

assert(r);

1046

void* mc){

1047

if(r == NULL){

1048

return;

1049

}

1001

1050

1002

1051

/* Called whenever a service has been resolved successfully or

1003

1052

timed out */

1012

1061

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

1013

1062

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

1014

1063

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

1064

avahi_strerror(avahi_server_errno

1065

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

1016

1066

break;

1017

1067

1018

1068

case AVAHI_RESOLVER_FOUND:

1024

1074

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

1025

1075

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

1026

1076

}

1027

int ret = start_mandos_communication(ip, port, interface,

1028

avahi_proto_to_af(proto));

1077

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

1078

interface,

1079

avahi_proto_to_af(proto),

1080

mc);

1029

1081

if(ret == 0){

1030

avahi_simple_poll_quit(mc.simple_poll);

1082

avahi_simple_poll_quit(simple_poll);

1031

1083

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

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

}

1034

1090

}

1035

1091

}

1036

1092

}

1046

1102

const char *domain,

1047

1103

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1048

1104

flags,

1049

AVAHI_GCC_UNUSED void* userdata){

1050

assert(b);

1105

void* mc){

1106

if(b == NULL){

1107

return;

1108

}

1051

1109

1052

1110

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

1053

1111

is removed from the LAN */

1061

1119

case AVAHI_BROWSER_FAILURE:

1062

1120

1063

1121

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1065

avahi_simple_poll_quit(mc.simple_poll);

1122

avahi_strerror(avahi_server_errno

1123

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

1124

avahi_simple_poll_quit(simple_poll);

1066

1125

return;

1067

1126

1068

1127

case AVAHI_BROWSER_NEW:

1071

1130

the callback function is called the Avahi server will free the

1072

1131

resolver for us. */

1073

1132

1074

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

1075

name, type, domain, protocol, 0,

1076

resolve_callback, NULL) == NULL)

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)

1077

1137

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

1078

1138

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1139

avahi_strerror(avahi_server_errno

1140

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

1080

1141

break;

1081

1142

1082

1143

case AVAHI_BROWSER_REMOVE:

1101

1162

signal_received = sig;

1102

1163

int old_errno = errno;

1103

1164

/* set main loop to exit */

1104

if(mc.simple_poll != NULL){

1105

avahi_simple_poll_quit(mc.simple_poll);

1165

if(simple_poll != NULL){

1166

avahi_simple_poll_quit(simple_poll);

1106

1167

}

1107

1168

errno = old_errno;

1108

1169

}

1109

1170

1110

1171

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

1111

1172

int ret;

1173

error_t ret_errno;

1112

1174

1113

1175

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

1114

1176

if(s < 0){

1177

ret_errno = errno;

1115

1178

perror_plus("socket");

1179

errno = ret_errno;

1116

1180

return false;

1117

1181

}

1118

1182

strcpy(ifr->ifr_name, ifname);

1119

1183

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

1184

if(ret == -1){

1121

1185

if(debug){

1186

ret_errno = errno;

1122

1187

perror_plus("ioctl SIOCGIFFLAGS");

1188

errno = ret_errno;

1123

1189

}

1124

1190

return false;

1125

1191

}

1194

1260

}

1195

1261

1196

1262

/*

1197

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

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1235

}

1236

return 1;

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);

1237

1292

}

1238

1293

1239

1294

int notdotentries(const struct dirent *direntry){

1308

1363

return 1;

1309

1364

}

1310

1365

1311

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1366

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1367

mandos_context *mc){

1312

1368

int ret;

1313

1369

struct timespec now;

1314

1370

struct timespec waited_time;

1315

1371

intmax_t block_time;

1316

1372

1317

1373

while(true){

1318

if(mc.current_server == NULL){

1374

if(mc->current_server == NULL){

1319

1375

if (debug){

1320

1376

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

1321

1377

" No timeout!\n");

1335

1391

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

1336

1392

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

1337

1393

waited_time.tv_sec = (now.tv_sec

1338

- mc.current_server->last_seen.tv_sec);

1394

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

1339

1395

waited_time.tv_nsec = (now.tv_nsec

1340

- mc.current_server->last_seen.tv_nsec);

1396

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

1341

1397

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

1342

1398

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

1343

1399

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

1351

1407

}

1352

1408

1353

1409

if(block_time <= 0){

1354

ret = start_mandos_communication(mc.current_server->ip,

1355

mc.current_server->port,

1356

mc.current_server->if_index,

1357

mc.current_server->af);

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);

1358

1414

if(ret == 0){

1359

avahi_simple_poll_quit(mc.simple_poll);

1415

avahi_simple_poll_quit(s);

1360

1416

return 0;

1361

1417

}

1362

1418

ret = clock_gettime(CLOCK_MONOTONIC,

1363

&mc.current_server->last_seen);

1419

&mc->current_server->last_seen);

1364

1420

if(ret == -1){

1365

1421

perror_plus("clock_gettime");

1366

1422

return -1;

1367

1423

}

1368

mc.current_server = mc.current_server->next;

1424

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

1369

1425

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

1370

1426

servers, but don't block */

1371

1427

}

1380

1436

}

1381

1437

}

1382

1438

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

1383

1491

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

1384

1492

const float delay){

1385

1493

struct dirent **direntries;

1386

struct dirent *direntry;

1387

int ret;

1388

1494

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

1389

1495

alphasort);

1390

1496

if(numhooks == -1){

1391

perror_plus("scandir");

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

1505

} else {

1506

struct dirent *direntry;

1507

int ret;

1393

1508

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

1394

1509

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

1395

1510

direntry = direntries[i];

1406

1521

pid_t hook_pid = fork();

1407

1522

if(hook_pid == 0){

1408

1523

/* Child */

1524

/* Raise privileges */

1525

raise_privileges_permanently();

1526

/* Set group */

1527

errno = 0;

1528

ret = setgid(0);

1529

if(ret == -1){

1530

perror_plus("setgid");

1531

}

1532

/* Reset supplementary groups */

1533

errno = 0;

1534

ret = setgroups(0, NULL);

1535

if(ret == -1){

1536

perror_plus("setgroups");

1537

}

1409

1538

dup2(devnull, STDIN_FILENO);

1410

1539

close(devnull);

1411

1540

dup2(STDERR_FILENO, STDOUT_FILENO);

1419

1548

perror_plus("setenv");

1420

1549

_exit(EX_OSERR);

1421

1550

}

1422

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

1551

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

1423

1552

if(ret == -1){

1424

1553

perror_plus("setenv");

1425

1554

_exit(EX_OSERR);

1442

1571

_exit(EX_OSERR);

1443

1572

}

1444

1573

free(delaystring);

1445

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

1446

perror_plus("execl");

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

}

1447

1585

} else {

1448

1586

int status;

1449

1587

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

1483

1621

return true;

1484

1622

}

1485

1623

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

1486

1794

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 };

1487

1799

AvahiSServiceBrowser *sb = NULL;

1488

int error;

1800

error_t ret_errno;

1489

1801

int ret;

1490

1802

intmax_t tmpmax;

1491

1803

char *tmp;

1492

1804

int exitcode = EXIT_SUCCESS;

1493

const char *interface = "";

1494

struct ifreq network;

1495

int sd = -1;

1496

bool take_down_interface = false;

1497

uid_t uid;

1498

gid_t gid;

1805

char *interfaces_to_take_down = NULL;

1806

size_t interfaces_to_take_down_size = 0;

1499

1807

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

1500

1808

bool tempdir_created = false;

1501

1809

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1502

1810

const char *seckey = PATHDIR "/" SECKEY;

1503

1811

const char *pubkey = PATHDIR "/" PUBKEY;

1812

char *interfaces_hooks = NULL;

1504

1813

1505

1814

bool gnutls_initialized = false;

1506

1815

bool gpgme_initialized = false;

1568

1877

.group = 2 },

1569

1878

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

1570

1879

.arg = "SECONDS",

1571

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

1880

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

1572

1881

.group = 2 },

1573

1882

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

1574

1883

.arg = "DIR",

1597

1906

connect_to = arg;

1598

1907

break;

1599

1908

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

1600

interface = arg;

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

}

1601

1914

break;

1602

1915

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

1603

1916

seckey = arg;

1646

1959

argp_state_help(state, state->out_stream,

1647

1960

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1648

1961

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

1649

fprintf_plus(state->out_stream,

1650

"Mandos plugin mandos-client: ");

1651

1962

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

1652

1963

exit(argp_err_exit_status);

1653

1964

break;

1678

1989

}

1679

1990

}

1680

1991

1681

if(getuid() == 0){

1992

{

1682

1993

/* Work around Debian bug #633582:

1683

1994

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

1684

struct stat st;

1685

1995

1686

1996

/* Re-raise priviliges */

1687

errno = 0;

1688

ret = seteuid(0);

1689

if(ret == -1){

1690

perror_plus("seteuid");

1691

}

1692

1693

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

1694

int seckey_fd = open(seckey, O_RDONLY);

1695

if(seckey_fd == -1){

1696

perror_plus("open");

1697

} else {

1698

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

1699

if(ret == -1){

1700

perror_plus("fstat");

1701

} else {

1702

if(S_ISREG(st.st_mode)

1703

and st.st_uid == 0 and st.st_gid == 0){

1704

ret = fchown(seckey_fd, uid, gid);

1705

if(ret == -1){

1706

perror_plus("fchown");

1707

}

1708

}

1709

}

1710

TEMP_FAILURE_RETRY(close(seckey_fd));

1711

}

1712

}

1713

1714

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

1715

int pubkey_fd = open(pubkey, O_RDONLY);

1716

if(pubkey_fd == -1){

1717

perror_plus("open");

1718

} else {

1719

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

1720

if(ret == -1){

1721

perror_plus("fstat");

1722

} else {

1723

if(S_ISREG(st.st_mode)

1724

and st.st_uid == 0 and st.st_gid == 0){

1725

ret = fchown(pubkey_fd, uid, gid);

1726

if(ret == -1){

1727

perror_plus("fchown");

1728

}

1729

}

1730

}

1731

TEMP_FAILURE_RETRY(close(pubkey_fd));

1732

}

1733

}

1734

1735

/* Lower privileges */

1736

errno = 0;

1737

ret = seteuid(uid);

1738

if(ret == -1){

1739

perror_plus("seteuid");

1997

if(raise_privileges() == 0){

1998

struct stat st;

1999

2000

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

2001

int seckey_fd = open(seckey, O_RDONLY);

2002

if(seckey_fd == -1){

2003

perror_plus("open");

2004

} else {

2005

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

2006

if(ret == -1){

2007

perror_plus("fstat");

2008

} else {

2009

if(S_ISREG(st.st_mode)

2010

and st.st_uid == 0 and st.st_gid == 0){

2011

ret = fchown(seckey_fd, uid, gid);

2012

if(ret == -1){

2013

perror_plus("fchown");

2014

}

2015

}

2016

}

2017

TEMP_FAILURE_RETRY(close(seckey_fd));

2018

}

2019

}

2020

2021

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

2022

int pubkey_fd = open(pubkey, O_RDONLY);

2023

if(pubkey_fd == -1){

2024

perror_plus("open");

2025

} else {

2026

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

2027

if(ret == -1){

2028

perror_plus("fstat");

2029

} else {

2030

if(S_ISREG(st.st_mode)

2031

and st.st_uid == 0 and st.st_gid == 0){

2032

ret = fchown(pubkey_fd, uid, gid);

2033

if(ret == -1){

2034

perror_plus("fchown");

2035

}

2036

}

2037

}

2038

TEMP_FAILURE_RETRY(close(pubkey_fd));

2039

}

2040

}

2041

2042

/* 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;

2060

}

1740

2061

}

1741

2062

}

1742

2063

1743

2064

/* Run network hooks */

1744

2065

{

1745

if(getuid() == 0){

1746

/* Re-raise priviliges */

1747

errno = 0;

1748

ret = seteuid(0);

1749

if(ret == -1){

1750

perror_plus("seteuid");

2066

if(mc.interfaces != NULL){

2067

interfaces_hooks = malloc(mc.interfaces_size);

2068

if(interfaces_hooks == NULL){

2069

perror_plus("malloc");

2070

goto end;

1751

2071

}

2072

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

2073

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

1752

2074

}

1753

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

2075

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

2076

interfaces_hooks : "", delay)){

1754

2077

goto end;

1755

2078

}

1756

if(getuid() == 0){

1757

/* Lower privileges */

1758

errno = 0;

1759

ret = seteuid(uid);

1760

if(ret == -1){

1761

perror_plus("seteuid");

1762

}

1763

}

1764

2079

}

1765

2080

1766

2081

if(not debug){

1767

2082

avahi_set_log_function(empty_log);

1768

2083

}

1769

2084

1770

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

1771

struct dirent **direntries;

1772

/* First look for interfaces that are up */

1773

ret = scandir(sys_class_net, &direntries, up_interface,

1774

alphasort);

1775

if(ret == 0){

1776

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

1777

free(direntries);

1778

ret = scandir(sys_class_net, &direntries, good_interface,

1779

alphasort);

1780

}

1781

if(ret >= 1){

1782

/* Pick the first interface returned */

1783

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

1784

if(debug){

1785

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

1786

}

1787

if(interface == NULL){

1788

perror_plus("malloc");

1789

free(direntries);

1790

exitcode = EXIT_FAILURE;

1791

goto end;

1792

}

1793

free(direntries);

1794

} else {

1795

free(direntries);

1796

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

1797

exitcode = EXIT_FAILURE;

1798

goto end;

1799

}

1800

}

1801

1802

2085

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

1803

2086

from the signal handler */

1804

2087

/* Initialize the pseudo-RNG for Avahi */

1805

2088

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

1806

mc.simple_poll = avahi_simple_poll_new();

1807

if(mc.simple_poll == NULL){

2089

simple_poll = avahi_simple_poll_new();

2090

if(simple_poll == NULL){

1808

2091

fprintf_plus(stderr,

1809

2092

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

1810

2093

exitcode = EX_UNAVAILABLE;

1874

2157

}

1875

2158

}

1876

2159

1877

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

1878

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

1879

if_index = (AvahiIfIndex) if_nametoindex(interface);

1880

if(if_index == 0){

1881

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

1882

exitcode = EX_UNAVAILABLE;

1883

goto end;

1884

}

1885

1886

if(quit_now){

1887

goto end;

1888

}

1889

1890

/* Re-raise priviliges */

1891

errno = 0;

1892

ret = seteuid(0);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

1897

#ifdef __linux__

1898

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1899

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

1900

ret = klogctl(8, NULL, 5);

1901

bool restore_loglevel = true;

1902

if(ret == -1){

1903

restore_loglevel = false;

1904

perror_plus("klogctl");

1905

}

1906

#endif /* __linux__ */

1907

1908

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1909

if(sd < 0){

1910

perror_plus("socket");

1911

exitcode = EX_OSERR;

1912

#ifdef __linux__

1913

if(restore_loglevel){

1914

ret = klogctl(7, NULL, 0);

1915

if(ret == -1){

1916

perror_plus("klogctl");

1917

}

1918

}

1919

#endif /* __linux__ */

1920

/* Lower privileges */

1921

errno = 0;

1922

ret = seteuid(uid);

1923

if(ret == -1){

1924

perror_plus("seteuid");

1925

}

1926

goto end;

1927

}

1928

strcpy(network.ifr_name, interface);

1929

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

1930

if(ret == -1){

1931

perror_plus("ioctl SIOCGIFFLAGS");

1932

#ifdef __linux__

1933

if(restore_loglevel){

1934

ret = klogctl(7, NULL, 0);

1935

if(ret == -1){

1936

perror_plus("klogctl");

1937

}

1938

}

1939

#endif /* __linux__ */

1940

exitcode = EX_OSERR;

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

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

1950

network.ifr_flags |= IFF_UP;

1951

take_down_interface = true;

1952

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

1953

if(ret == -1){

1954

take_down_interface = false;

1955

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1956

exitcode = EX_OSERR;

1957

#ifdef __linux__

1958

if(restore_loglevel){

1959

ret = klogctl(7, NULL, 0);

1960

if(ret == -1){

1961

perror_plus("klogctl");

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;

1962

2207

}

1963

2208

}

1964

#endif /* __linux__ */

1965

/* Lower privileges */

1966

errno = 0;

1967

ret = seteuid(uid);

1968

if(ret == -1){

1969

perror_plus("seteuid");

1970

}

1971

goto end;

1972

}

1973

}

1974

/* Sleep checking until interface is running.

1975

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

1976

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

1977

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

1978

if(ret == -1){

1979

perror_plus("ioctl SIOCGIFFLAGS");

1980

} else if(network.ifr_flags & IFF_RUNNING){

1981

2209

break;

1982

2210

}

1983

struct timespec sleeptime = { .tv_nsec = 250000000 };

1984

ret = nanosleep(&sleeptime, NULL);

1985

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

1986

perror_plus("nanosleep");

1987

}

1988

}

1989

if(not take_down_interface){

1990

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

1991

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

1992

if(ret == -1){

1993

perror_plus("close");

1994

}

1995

}

1996

#ifdef __linux__

1997

if(restore_loglevel){

1998

/* Restores kernel loglevel to default */

1999

ret = klogctl(7, NULL, 0);

2000

if(ret == -1){

2001

perror_plus("klogctl");

2002

}

2003

}

2004

#endif /* __linux__ */

2005

/* Lower privileges */

2006

errno = 0;

2007

/* Lower privileges */

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

2011

}

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);

2012

2240

}

2013

2241

2014

2242

if(quit_now){

2015

2243

goto end;

2016

2244

}

2017

2245

2018

ret = init_gnutls_global(pubkey, seckey);

2246

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

2019

2247

if(ret == -1){

2020

2248

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

2021

2249

exitcode = EX_UNAVAILABLE;

2038

2266

goto end;

2039

2267

}

2040

2268

2041

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

2269

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

2042

2270

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

2043

2271

exitcode = EX_UNAVAILABLE;

2044

2272

goto end;

2054

2282

/* Connect directly, do not use Zeroconf */

2055

2283

/* (Mainly meant for debugging) */

2056

2284

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

2285

2057

2286

if(address == NULL){

2058

2287

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

2059

2288

exitcode = EX_USAGE;

2064

2293

goto end;

2065

2294

}

2066

2295

2067

uint16_t port;

2296

in_port_t port;

2068

2297

errno = 0;

2069

2298

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

2070

2299

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

2071

or tmpmax != (uint16_t)tmpmax){

2300

or tmpmax != (in_port_t)tmpmax){

2072

2301

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

2073

2302

exitcode = EX_USAGE;

2074

2303

goto end;

2075

2304

}

2076

2305

2077

2306

if(quit_now){

2078

2307

goto end;

2079

2308

}

2080

2309

2081

port = (uint16_t)tmpmax;

2310

port = (in_port_t)tmpmax;

2082

2311

*address = '\0';

2083

2312

/* Colon in address indicates IPv6 */

2084

2313

int af;

2100

2329

}

2101

2330

2102

2331

while(not quit_now){

2103

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

2332

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

2333

&mc);

2104

2334

if(quit_now or ret == 0){

2105

2335

break;

2106

2336

}

2108

2338

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

2109

2339

(int)retry_interval);

2110

2340

}

2111

sleep((int)retry_interval);

2341

sleep((unsigned int)retry_interval);

2112

2342

}

2113

2343

2114

2344

if (not quit_now){

2132

2362

config.publish_domain = 0;

2133

2363

2134

2364

/* Allocate a new server */

2135

mc.server = avahi_server_new(avahi_simple_poll_get

2136

(mc.simple_poll), &config, NULL,

2137

NULL, &error);

2365

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2366

&config, NULL, NULL, &ret_errno);

2138

2367

2139

2368

/* Free the Avahi configuration data */

2140

2369

avahi_server_config_free(&config);

2143

2372

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

2144

2373

if(mc.server == NULL){

2145

2374

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

2146

avahi_strerror(error));

2375

avahi_strerror(ret_errno));

2147

2376

exitcode = EX_UNAVAILABLE;

2148

2377

goto end;

2149

2378

}

2155

2384

/* Create the Avahi service browser */

2156

2385

sb = avahi_s_service_browser_new(mc.server, if_index,

2157

2386

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2158

NULL, 0, browse_callback, NULL);

2387

NULL, 0, browse_callback,

2388

(void *)&mc);

2159

2389

if(sb == NULL){

2160

2390

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

2161

2391

avahi_strerror(avahi_server_errno(mc.server)));

2173

2403

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

2174

2404

}

2175

2405

2176

ret = avahi_loop_with_timeout(mc.simple_poll,

2177

(int)(retry_interval * 1000));

2406

ret = avahi_loop_with_timeout(simple_poll,

2407

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

2178

2408

if(debug){

2179

2409

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

2180

2410

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

2187

2417

}

2188

2418

2189

2419

/* Cleanup things */

2420

free(mc.interfaces);

2421

2190

2422

if(sb != NULL)

2191

2423

avahi_s_service_browser_free(sb);

2192

2424

2193

2425

if(mc.server != NULL)

2194

2426

avahi_server_free(mc.server);

2195

2427

2196

if(mc.simple_poll != NULL)

2197

avahi_simple_poll_free(mc.simple_poll);

2428

if(simple_poll != NULL)

2429

avahi_simple_poll_free(simple_poll);

2198

2430

2199

2431

if(gnutls_initialized){

2200

2432

gnutls_certificate_free_credentials(mc.cred);

2219

2451

2220

2452

/* Re-raise priviliges */

2221

2453

{

2222

if(getuid() == 0){

2223

errno = 0;

2224

ret = seteuid(0);

2225

if(ret == -1){

2226

perror_plus("seteuid");

2227

}

2228

}

2454

raise_privileges();

2229

2455

2230

2456

/* Run network hooks */

2231

run_network_hooks("stop", interface, delay);

2457

run_network_hooks("stop", interfaces_hooks != NULL ?

2458

interfaces_hooks : "", delay);

2232

2459

2233

/* Take down the network interface */

2234

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

2235

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

2236

if(ret == -1){

2237

perror_plus("ioctl SIOCGIFFLAGS");

2238

} else if(network.ifr_flags & IFF_UP){

2239

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

2240

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

2241

if(ret == -1){

2242

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

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");

2243

2470

}

2244

2471

}

2245

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

2246

if(ret == -1){

2247

perror_plus("close");

2472

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

2473

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

2474

" down\n");

2248

2475

}

2249

2476

}

2250

}

2251

if(getuid() == 0){

2252

/* Lower privileges permanently */

2253

errno = 0;

2254

ret = setuid(uid);

2255

if(ret == -1){

2256

perror_plus("setuid");

2257

}

2258

}

2477

2478

lower_privileges_permanently();

2479

}

2480

2481

free(interfaces_to_take_down);

2482

free(interfaces_hooks);

2259

2483

2260

2484

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

2261

2485

if(tempdir_created){