/mandos/release : revision 237.16.10

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

10

*

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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, intptr_t */

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#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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*/

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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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*/

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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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setgid(), pause() */

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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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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() */

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#ifdef __linux__

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

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

139

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char *connect_to = NULL;

140

136

const char *hookdir = HOOKDIR;

141

uid_t uid = 65534;

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gid_t gid = 65534;

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137

144

138

/* 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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in_port_t port;

141

uint16_t port;

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AvahiIfIndex if_index;

149

143

int af;

150

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struct timespec last_seen;

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148

155

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

159

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unsigned int dh_bits;

161

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const char *priority;

162

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gpgme_ctx_t ctx;

163

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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159

} mandos_context;

167

160

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/* global so signal handler can reach it*/

169

AvahiSimplePoll *simple_poll;

161

/* 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 };

170

166

171

167

sig_atomic_t quit_now = 0;

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168

int signal_received = 0;

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169

174

170

/* Function to use when printing errors */

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171

void perror_plus(const char *print_text){

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int e = errno;

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

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173

program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

184

177

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

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va_list ap;

186

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va_start (ap, format);

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}

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210

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

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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){

213

206

int ret;

214

207

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

215

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if(new_server == NULL){

216

209

perror_plus("malloc");

217

return false;

210

return -1;

218

211

}

219

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

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213

.port = port,

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.af = af };

223

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if(new_server->ip == NULL){

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217

perror_plus("strdup");

225

return false;

218

return -1;

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219

}

227

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/* Special case of first server */

228

if(*current_server == NULL){

221

if (mc.current_server == NULL){

229

222

new_server->next = new_server;

230

223

new_server->prev = new_server;

231

*current_server = new_server;

224

mc.current_server = new_server;

232

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

233

226

} else {

234

new_server->next = *current_server;

235

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

227

new_server->next = mc.current_server;

228

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

236

229

new_server->prev->next = new_server;

237

(*current_server)->prev = new_server;

230

mc.current_server->prev = new_server;

238

231

}

239

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

232

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

240

233

if(ret == -1){

241

234

perror_plus("clock_gettime");

242

return false;

235

return -1;

243

236

}

244

return true;

237

return 0;

245

238

}

246

239

247

240

/*

248

241

* Initialize GPGME.

249

242

*/

250

243

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

251

const char *tempdir, mandos_context *mc){

244

const char *tempdir){

252

245

gpgme_error_t rc;

253

246

gpgme_engine_info_t engine_info;

254

247

248

255

249

/*

256

250

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

257

251

*/

273

267

return false;

274

268

}

275

269

276

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

270

rc = gpgme_op_import(mc.ctx, pgp_data);

277

271

if(rc != GPG_ERR_NO_ERROR){

278

272

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

279

273

gpgme_strsource(rc), gpgme_strerror(rc));

323

317

}

324

318

325

319

/* Create new GPGME "context" */

326

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

320

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

327

321

if(rc != GPG_ERR_NO_ERROR){

328

322

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

329

323

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

344

338

*/

345

339

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

340

size_t crypto_size,

347

char **plaintext,

348

mandos_context *mc){

341

char **plaintext){

349

342

gpgme_data_t dh_crypto, dh_plain;

350

343

gpgme_error_t rc;

351

344

ssize_t ret;

377

370

378

371

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

379

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data buffer */

380

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

373

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

381

374

if(rc != GPG_ERR_NO_ERROR){

382

375

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

383

376

gpgme_strsource(rc), gpgme_strerror(rc));

384

377

plaintext_length = -1;

385

378

if(debug){

386

379

gpgme_decrypt_result_t result;

387

result = gpgme_op_decrypt_result(mc->ctx);

380

result = gpgme_op_decrypt_result(mc.ctx);

388

381

if(result == NULL){

389

382

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

390

383

} else {

468

461

}

469

462

470

463

static const char * safer_gnutls_strerror(int value){

471

const char *ret = gnutls_strerror(value);

464

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

465

-Wunreachable-code */

472

466

if(ret == NULL)

473

467

ret = "(unknown)";

474

468

return ret;

481

475

}

482

476

483

477

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename,

485

mandos_context *mc){

478

const char *seckeyfilename){

486

479

int ret;

487

480

488

481

if(debug){

505

498

}

506

499

507

500

/* OpenPGP credentials */

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

509

502

if(ret != GNUTLS_E_SUCCESS){

510

503

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

511

504

safer_gnutls_strerror(ret));

521

514

}

522

515

523

516

ret = gnutls_certificate_set_openpgp_key_file

524

(mc->cred, pubkeyfilename, seckeyfilename,

517

(mc.cred, pubkeyfilename, seckeyfilename,

525

518

GNUTLS_OPENPGP_FMT_BASE64);

526

519

if(ret != GNUTLS_E_SUCCESS){

527

520

fprintf_plus(stderr,

533

526

}

534

527

535

528

/* GnuTLS server initialization */

536

ret = gnutls_dh_params_init(&mc->dh_params);

529

ret = gnutls_dh_params_init(&mc.dh_params);

537

530

if(ret != GNUTLS_E_SUCCESS){

538

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

532

" initialization: %s\n",

540

533

safer_gnutls_strerror(ret));

541

534

goto globalfail;

542

535

}

543

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

536

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

544

537

if(ret != GNUTLS_E_SUCCESS){

545

538

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

546

539

safer_gnutls_strerror(ret));

547

540

goto globalfail;

548

541

}

549

542

550

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

543

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

551

544

552

545

return 0;

553

546

554

547

globalfail:

555

548

556

gnutls_certificate_free_credentials(mc->cred);

549

gnutls_certificate_free_credentials(mc.cred);

557

550

gnutls_global_deinit();

558

gnutls_dh_params_deinit(mc->dh_params);

551

gnutls_dh_params_deinit(mc.dh_params);

559

552

return -1;

560

553

}

561

554

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

555

static int init_gnutls_session(gnutls_session_t *session){

564

556

int ret;

565

557

/* GnuTLS session creation */

566

558

do {

578

570

{

579

571

const char *err;

580

572

do {

581

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

573

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

582

574

if(quit_now){

583

575

gnutls_deinit(*session);

584

576

return -1;

595

587

596

588

do {

597

589

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc->cred);

590

mc.cred);

599

591

if(quit_now){

600

592

gnutls_deinit(*session);

601

593

return -1;

611

603

/* ignore client certificate if any. */

612

604

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

605

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

615

607

616

608

return 0;

617

609

}

621

613

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

622

614

623

615

/* Called when a Mandos server is found */

624

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

616

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

625

617

AvahiIfIndex if_index,

626

int af, mandos_context *mc){

618

int af){

627

619

int ret, tcp_sd = -1;

628

620

ssize_t sret;

629

621

union {

659

651

return -1;

660

652

}

661

653

662

ret = init_gnutls_session(&session, mc);

654

ret = init_gnutls_session(&session);

663

655

if(ret != 0){

664

656

return -1;

665

657

}

666

658

667

659

if(debug){

668

660

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

669

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

661

PRIu16 "\n", ip, port);

670

662

}

671

663

672

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

703

695

goto mandos_end;

704

696

}

705

697

if(af == AF_INET6){

706

to.in6.sin6_port = htons(port);

698

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

699

-Wconversion and

700

-Wunreachable-code */

701

707

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

708

703

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

709

704

-Wunreachable-code*/

733

728

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

734

729

perror_plus("if_indextoname");

735

730

} else {

736

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

737

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

731

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

732

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

738

733

}

739

734

} else {

740

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

741

ip, (uintmax_t)port);

735

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

736

ip, port);

742

737

}

743

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

744

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

822

817

goto mandos_end;

823

818

}

824

819

825

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

826

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

827

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

828

gnutls_transport_set_ptr(session,

829

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

820

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

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

830

822

831

823

if(quit_now){

832

824

errno = EINTR;

937

929

if(buffer_length > 0){

938

930

ssize_t decrypted_buffer_size;

939

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

940

&decrypted_buffer, mc);

932

&decrypted_buffer);

941

933

if(decrypted_buffer_size >= 0){

942

934

943

935

written = 0;

1004

996

AVAHI_GCC_UNUSED AvahiStringList *txt,

1005

997

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

998

flags,

1007

void* mc){

1008

if(r == NULL){

1009

return;

1010

}

999

AVAHI_GCC_UNUSED void* userdata){

1000

assert(r);

1011

1001

1012

1002

/* Called whenever a service has been resolved successfully or

1013

1003

timed out */

1022

1012

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

1023

1013

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

1024

1014

domain,

1025

avahi_strerror(avahi_server_errno

1026

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

1015

avahi_strerror(avahi_server_errno(mc.server)));

1027

1016

break;

1028

1017

1029

1018

case AVAHI_RESOLVER_FOUND:

1035

1024

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

1036

1025

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

1037

1026

}

1038

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

1039

interface,

1040

avahi_proto_to_af(proto),

1041

mc);

1027

int ret = start_mandos_communication(ip, port, interface,

1028

avahi_proto_to_af(proto));

1042

1029

if(ret == 0){

1043

avahi_simple_poll_quit(simple_poll);

1030

avahi_simple_poll_quit(mc.simple_poll);

1044

1031

} else {

1045

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

1046

avahi_proto_to_af(proto),

1047

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

1048

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

1049

" list\n", name);

1050

}

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1051

1034

}

1052

1035

}

1053

1036

}

1063

1046

const char *domain,

1064

1047

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1065

1048

flags,

1066

void* mc){

1067

if(b == NULL){

1068

return;

1069

}

1049

AVAHI_GCC_UNUSED void* userdata){

1050

assert(b);

1070

1051

1071

1052

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

1072

1053

is removed from the LAN */

1080

1061

case AVAHI_BROWSER_FAILURE:

1081

1062

1082

1063

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

1083

avahi_strerror(avahi_server_errno

1084

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

1085

avahi_simple_poll_quit(simple_poll);

1064

avahi_strerror(avahi_server_errno(mc.server)));

1065

avahi_simple_poll_quit(mc.simple_poll);

1086

1066

return;

1087

1067

1088

1068

case AVAHI_BROWSER_NEW:

1091

1071

the callback function is called the Avahi server will free the

1092

1072

resolver for us. */

1093

1073

1094

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

1095

interface, protocol, name, type,

1096

domain, protocol, 0,

1097

resolve_callback, mc) == NULL)

1074

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

1075

name, type, domain, protocol, 0,

1076

resolve_callback, NULL) == NULL)

1098

1077

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

1099

1078

" %s\n", name,

1100

avahi_strerror(avahi_server_errno

1101

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

1079

avahi_strerror(avahi_server_errno(mc.server)));

1102

1080

break;

1103

1081

1104

1082

case AVAHI_BROWSER_REMOVE:

1123

1101

signal_received = sig;

1124

1102

int old_errno = errno;

1125

1103

/* set main loop to exit */

1126

if(simple_poll != NULL){

1127

avahi_simple_poll_quit(simple_poll);

1104

if(mc.simple_poll != NULL){

1105

avahi_simple_poll_quit(mc.simple_poll);

1128

1106

}

1129

1107

errno = old_errno;

1130

1108

}

1131

1109

1132

1110

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

1133

1111

int ret;

1134

error_t ret_errno;

1135

1112

1136

1113

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

1137

1114

if(s < 0){

1138

ret_errno = errno;

1139

1115

perror_plus("socket");

1140

errno = ret_errno;

1141

1116

return false;

1142

1117

}

1143

1118

strcpy(ifr->ifr_name, ifname);

1144

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1145

1120

if(ret == -1){

1146

1121

if(debug){

1147

ret_errno = errno;

1148

1122

perror_plus("ioctl SIOCGIFFLAGS");

1149

errno = ret_errno;

1150

1123

}

1151

1124

return false;

1152

1125

}

1221

1194

}

1222

1195

1223

1196

/*

1224

* This function determines if a network interface is up.

1225

*/

1226

bool interface_is_up(const char *interface){

1227

struct ifreq ifr;

1228

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

1229

if(debug){

1230

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

1231

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

1232

}

1233

return false;

1234

}

1235

1236

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

1237

}

1238

1239

/*

1240

* This function determines if a network interface is running

1241

*/

1242

bool interface_is_running(const char *interface){

1243

struct ifreq ifr;

1244

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

1245

if(debug){

1246

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

1247

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

1248

}

1249

return false;

1250

}

1251

1252

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

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;

1253

1237

}

1254

1238

1255

1239

int notdotentries(const struct dirent *direntry){

1317

1301

}

1318

1302

return 0;

1319

1303

}

1320

if(debug){

1321

fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",

1322

direntry->d_name);

1323

}

1324

1304

return 1;

1325

1305

}

1326

1306

1327

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1328

mandos_context *mc){

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1329

1308

int ret;

1330

1309

struct timespec now;

1331

1310

struct timespec waited_time;

1332

1311

intmax_t block_time;

1333

1312

1334

1313

while(true){

1335

if(mc->current_server == NULL){

1314

if(mc.current_server == NULL){

1336

1315

if (debug){

1337

1316

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

1338

1317

" No timeout!\n");

1352

1331

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

1353

1332

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

1354

1333

waited_time.tv_sec = (now.tv_sec

1355

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

1334

- mc.current_server->last_seen.tv_sec);

1356

1335

waited_time.tv_nsec = (now.tv_nsec

1357

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

1336

- mc.current_server->last_seen.tv_nsec);

1358

1337

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

1359

1338

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

1360

1339

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

1368

1347

}

1369

1348

1370

1349

if(block_time <= 0){

1371

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

1372

mc->current_server->port,

1373

mc->current_server->if_index,

1374

mc->current_server->af, mc);

1350

ret = start_mandos_communication(mc.current_server->ip,

1351

mc.current_server->port,

1352

mc.current_server->if_index,

1353

mc.current_server->af);

1375

1354

if(ret == 0){

1376

avahi_simple_poll_quit(s);

1355

avahi_simple_poll_quit(mc.simple_poll);

1377

1356

return 0;

1378

1357

}

1379

1358

ret = clock_gettime(CLOCK_MONOTONIC,

1380

&mc->current_server->last_seen);

1359

&mc.current_server->last_seen);

1381

1360

if(ret == -1){

1382

1361

perror_plus("clock_gettime");

1383

1362

return -1;

1384

1363

}

1385

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

1364

mc.current_server = mc.current_server->next;

1386

1365

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

1387

1366

servers, but don't block */

1388

1367

}

1397

1376

}

1398

1377

}

1399

1378

1400

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

1401

error_t raise_privileges(void){

1402

error_t old_errno = errno;

1403

error_t ret_errno = 0;

1404

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

1405

ret_errno = errno;

1406

perror_plus("seteuid");

1407

}

1408

errno = old_errno;

1409

return ret_errno;

1410

}

1411

1412

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

1413

error_t raise_privileges_permanently(void){

1414

error_t old_errno = errno;

1415

error_t ret_errno = raise_privileges();

1416

if(ret_errno != 0){

1417

errno = old_errno;

1418

return ret_errno;

1419

}

1420

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

1421

ret_errno = errno;

1422

perror_plus("seteuid");

1423

}

1424

errno = old_errno;

1425

return ret_errno;

1426

}

1427

1428

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

1429

error_t lower_privileges(void){

1430

error_t old_errno = errno;

1431

error_t ret_errno = 0;

1432

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

1433

ret_errno = errno;

1434

perror_plus("seteuid");

1435

}

1436

errno = old_errno;

1437

return ret_errno;

1438

}

1439

1440

/* Lower privileges permanently */

1441

error_t lower_privileges_permanently(void){

1442

error_t old_errno = errno;

1443

error_t ret_errno = 0;

1444

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

1445

ret_errno = errno;

1446

perror_plus("setuid");

1447

}

1448

errno = old_errno;

1449

return ret_errno;

1450

}

1451

1452

1379

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

1453

1380

const float delay){

1454

1381

struct dirent **direntries;

1457

1384

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

1458

1385

alphasort);

1459

1386

if(numhooks == -1){

1460

if(errno == ENOENT){

1461

if(debug){

1462

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

1463

" found\n", hookdir);

1464

}

1465

} else {

1466

perror_plus("scandir");

1467

}

1387

perror_plus("scandir");

1468

1388

} else {

1469

1389

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

1470

1390

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

1471

direntry = direntries[i];

1391

direntry = direntries[0];

1472

1392

char *fullname = NULL;

1473

1393

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1474

1394

if(ret < 0){

1475

1395

perror_plus("asprintf");

1476

1396

continue;

1477

1397

}

1478

if(debug){

1479

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1480

direntry->d_name);

1481

}

1482

1398

pid_t hook_pid = fork();

1483

1399

if(hook_pid == 0){

1484

1400

/* Child */

1485

/* Raise privileges */

1486

raise_privileges_permanently();

1487

/* Set group */

1488

errno = 0;

1489

ret = setgid(0);

1490

if(ret == -1){

1491

perror_plus("setgid");

1492

}

1493

/* Reset supplementary groups */

1494

errno = 0;

1495

ret = setgroups(0, NULL);

1496

if(ret == -1){

1497

perror_plus("setgroups");

1498

}

1499

1401

dup2(devnull, STDIN_FILENO);

1500

1402

close(devnull);

1501

1403

dup2(STDERR_FILENO, STDOUT_FILENO);

1502

1404

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

1503

1405

if(ret == -1){

1504

1406

perror_plus("setenv");

1505

_exit(EX_OSERR);

1407

return false;

1506

1408

}

1507

1409

ret = setenv("DEVICE", interface, 1);

1508

1410

if(ret == -1){

1509

1411

perror_plus("setenv");

1510

_exit(EX_OSERR);

1412

return false;

1511

1413

}

1512

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

1414

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

1513

1415

if(ret == -1){

1514

1416

perror_plus("setenv");

1515

_exit(EX_OSERR);

1417

return false;

1516

1418

}

1517

1419

ret = setenv("MODE", mode, 1);

1518

1420

if(ret == -1){

1519

1421

perror_plus("setenv");

1520

_exit(EX_OSERR);

1422

return false;

1521

1423

}

1522

1424

char *delaystring;

1523

1425

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

1524

1426

if(ret == -1){

1525

1427

perror_plus("asprintf");

1526

_exit(EX_OSERR);

1428

return false;

1527

1429

}

1528

1430

ret = setenv("DELAY", delaystring, 1);

1529

1431

if(ret == -1){

1530

1432

free(delaystring);

1531

1433

perror_plus("setenv");

1532

_exit(EX_OSERR);

1434

return false;

1533

1435

}

1534

1436

free(delaystring);

1535

if(connect_to != NULL){

1536

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

1537

if(ret == -1){

1538

perror_plus("setenv");

1539

_exit(EX_OSERR);

1540

}

1541

}

1542

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

1543

perror_plus("execl");

1544

_exit(EXIT_FAILURE);

1545

}

1437

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

1438

perror_plus("execl");

1546

1439

} else {

1547

1440

int status;

1548

1441

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

1572

1465

}

1573

1466

}

1574

1467

free(fullname);

1575

if(debug){

1576

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1577

direntry->d_name);

1468

if(quit_now){

1469

break;

1578

1470

}

1579

1471

}

1580

1472

close(devnull);

1582

1474

return true;

1583

1475

}

1584

1476

1585

error_t bring_up_interface(const char *const interface,

1586

const float delay){

1587

int sd = -1;

1588

error_t old_errno = errno;

1589

error_t ret_errno = 0;

1590

int ret, ret_setflags;

1591

struct ifreq network;

1592

unsigned int if_index = if_nametoindex(interface);

1593

if(if_index == 0){

1594

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

1595

errno = old_errno;

1596

return ENXIO;

1597

}

1598

1599

if(quit_now){

1600

errno = old_errno;

1601

return EINTR;

1602

}

1603

1604

if(not interface_is_up(interface)){

1605

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

1606

ret_errno = errno;

1607

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

1608

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

1609

return ret_errno;

1610

}

1611

network.ifr_flags |= IFF_UP;

1612

1613

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1614

if(sd < 0){

1615

ret_errno = errno;

1616

perror_plus("socket");

1617

errno = old_errno;

1618

return ret_errno;

1619

}

1620

1621

if(quit_now){

1622

close(sd);

1623

errno = old_errno;

1624

return EINTR;

1625

}

1626

1627

if(debug){

1628

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

1629

interface);

1630

}

1631

1632

/* Raise priviliges */

1633

raise_privileges();

1634

1635

#ifdef __linux__

1636

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1637

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

1638

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

1639

bool restore_loglevel = true;

1640

if(ret_linux == -1){

1641

restore_loglevel = false;

1642

perror_plus("klogctl");

1643

}

1644

#endif /* __linux__ */

1645

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

1646

ret_errno = errno;

1647

#ifdef __linux__

1648

if(restore_loglevel){

1649

ret_linux = klogctl(7, NULL, 0);

1650

if(ret_linux == -1){

1651

perror_plus("klogctl");

1652

}

1653

}

1654

#endif /* __linux__ */

1655

1656

/* Lower privileges */

1657

lower_privileges();

1658

1659

/* Close the socket */

1660

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

1661

if(ret == -1){

1662

perror_plus("close");

1663

}

1664

1665

if(ret_setflags == -1){

1666

errno = ret_errno;

1667

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1668

errno = old_errno;

1669

return ret_errno;

1670

}

1671

} else if(debug){

1672

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

1673

interface);

1674

}

1675

1676

/* Sleep checking until interface is running.

1677

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

1678

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

1679

if(interface_is_running(interface)){

1680

break;

1681

}

1682

struct timespec sleeptime = { .tv_nsec = 250000000 };

1683

ret = nanosleep(&sleeptime, NULL);

1684

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

1685

perror_plus("nanosleep");

1686

}

1687

}

1688

1689

errno = old_errno;

1690

return 0;

1691

}

1692

1693

error_t take_down_interface(const char *const interface){

1694

int sd = -1;

1695

error_t old_errno = errno;

1696

error_t ret_errno = 0;

1697

int ret, ret_setflags;

1698

struct ifreq network;

1699

unsigned int if_index = if_nametoindex(interface);

1700

if(if_index == 0){

1701

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

1702

errno = old_errno;

1703

return ENXIO;

1704

}

1705

if(interface_is_up(interface)){

1706

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

1707

ret_errno = errno;

1708

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

1709

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

1710

return ret_errno;

1711

}

1712

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

1713

1714

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1715

if(sd < 0){

1716

ret_errno = errno;

1717

perror_plus("socket");

1718

errno = old_errno;

1719

return ret_errno;

1720

}

1721

1722

if(debug){

1723

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

1724

interface);

1725

}

1726

1727

/* Raise priviliges */

1728

raise_privileges();

1729

1730

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

1731

ret_errno = errno;

1732

1733

/* Lower privileges */

1734

lower_privileges();

1735

1736

/* Close the socket */

1737

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

1738

if(ret == -1){

1739

perror_plus("close");

1740

}

1741

1742

if(ret_setflags == -1){

1743

errno = ret_errno;

1744

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1745

errno = old_errno;

1746

return ret_errno;

1747

}

1748

} else if(debug){

1749

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

1750

interface);

1751

}

1752

1753

errno = old_errno;

1754

return 0;

1755

}

1756

1757

1477

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

1758

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

1759

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

1760

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

1761

.interfaces = NULL, .interfaces_size = 0 };

1762

1478

AvahiSServiceBrowser *sb = NULL;

1763

error_t ret_errno;

1479

int error;

1764

1480

int ret;

1765

1481

intmax_t tmpmax;

1766

1482

char *tmp;

1767

1483

int exitcode = EXIT_SUCCESS;

1768

char *interfaces_to_take_down = NULL;

1769

size_t interfaces_to_take_down_size = 0;

1484

const char *interface = "";

1485

struct ifreq network;

1486

int sd = -1;

1487

bool take_down_interface = false;

1488

uid_t uid;

1489

gid_t gid;

1770

1490

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

1771

1491

bool tempdir_created = false;

1772

1492

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1773

1493

const char *seckey = PATHDIR "/" SECKEY;

1774

1494

const char *pubkey = PATHDIR "/" PUBKEY;

1775

char *interfaces_hooks = NULL;

1776

size_t interfaces_hooks_size = 0;

1777

1495

1778

1496

bool gnutls_initialized = false;

1779

1497

bool gpgme_initialized = false;

1841

1559

.group = 2 },

1842

1560

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

1843

1561

.arg = "SECONDS",

1844

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

1562

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

1845

1563

.group = 2 },

1846

1564

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

1847

1565

.arg = "DIR",

1870

1588

connect_to = arg;

1871

1589

break;

1872

1590

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

1873

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

1874

arg, (int)',');

1875

if(ret_errno != 0){

1876

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

1877

}

1591

interface = arg;

1878

1592

break;

1879

1593

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

1880

1594

seckey = arg;

1923

1637

argp_state_help(state, state->out_stream,

1924

1638

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1925

1639

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

1926

1642

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

1927

1643

exit(argp_err_exit_status);

1928

1644

break;

1956

1672

{

1957

1673

/* Work around Debian bug #633582:

1958

1674

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

1675

struct stat st;

1959

1676

1960

1677

/* Re-raise priviliges */

1961

if(raise_privileges() == 0){

1962

struct stat st;

1963

1964

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

1965

int seckey_fd = open(seckey, O_RDONLY);

1966

if(seckey_fd == -1){

1967

perror_plus("open");

1968

} else {

1969

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

1970

if(ret == -1){

1971

perror_plus("fstat");

1972

} else {

1973

if(S_ISREG(st.st_mode)

1974

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

1975

ret = fchown(seckey_fd, uid, gid);

1976

if(ret == -1){

1977

perror_plus("fchown");

1978

}

1979

}

1980

}

1981

TEMP_FAILURE_RETRY(close(seckey_fd));

1982

}

1983

}

1984

1985

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

1986

int pubkey_fd = open(pubkey, O_RDONLY);

1987

if(pubkey_fd == -1){

1988

perror_plus("open");

1989

} else {

1990

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

1991

if(ret == -1){

1992

perror_plus("fstat");

1993

} else {

1994

if(S_ISREG(st.st_mode)

1995

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

1996

ret = fchown(pubkey_fd, uid, gid);

1997

if(ret == -1){

1998

perror_plus("fchown");

1999

}

2000

}

2001

}

2002

TEMP_FAILURE_RETRY(close(pubkey_fd));

2003

}

2004

}

2005

2006

/* Lower privileges */

2007

errno = 0;

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

2011

}

2012

}

2013

}

2014

2015

/* Remove empty interface names */

2016

{

2017

char *interface = NULL;

2018

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

2019

interface))){

2020

if(if_nametoindex(interface) == 0){

2021

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

2022

fprintf_plus(stderr, "Not using nonexisting interface"

2023

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

2024

}

2025

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

2026

interface = NULL;

2027

}

1678

errno = 0;

1679

ret = seteuid(0);

1680

if(ret == -1){

1681

perror_plus("seteuid");

1682

}

1683

1684

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

1685

int seckey_fd = open(seckey, O_RDONLY);

1686

if(seckey_fd == -1){

1687

perror_plus("open");

1688

} else {

1689

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

1690

if(ret == -1){

1691

perror_plus("fstat");

1692

} else {

1693

if(S_ISREG(st.st_mode)

1694

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

1695

ret = fchown(seckey_fd, uid, gid);

1696

if(ret == -1){

1697

perror_plus("fchown");

1698

}

1699

}

1700

}

1701

TEMP_FAILURE_RETRY(close(seckey_fd));

1702

}

1703

}

1704

1705

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

1706

int pubkey_fd = open(pubkey, O_RDONLY);

1707

if(pubkey_fd == -1){

1708

perror_plus("open");

1709

} else {

1710

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

1711

if(ret == -1){

1712

perror_plus("fstat");

1713

} else {

1714

if(S_ISREG(st.st_mode)

1715

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

1716

ret = fchown(pubkey_fd, uid, gid);

1717

if(ret == -1){

1718

perror_plus("fchown");

1719

}

1720

}

1721

}

1722

TEMP_FAILURE_RETRY(close(pubkey_fd));

1723

}

1724

}

1725

1726

/* Lower privileges */

1727

errno = 0;

1728

ret = seteuid(uid);

1729

if(ret == -1){

1730

perror_plus("seteuid");

2028

1731

}

2029

1732

}

2030

1733

2031

1734

/* Run network hooks */

2032

1735

{

2033

2034

if(mc.interfaces != NULL){

2035

interfaces_hooks = malloc(mc.interfaces_size);

2036

if(interfaces_hooks == NULL){

2037

perror_plus("malloc");

2038

goto end;

2039

}

2040

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

2041

interfaces_hooks_size = mc.interfaces_size;

2042

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2043

(int)',');

1736

/* Re-raise priviliges */

1737

errno = 0;

1738

ret = seteuid(0);

1739

if(ret == -1){

1740

perror_plus("seteuid");

2044

1741

}

2045

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

2046

interfaces_hooks : "", delay)){

1742

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

2047

1743

goto end;

2048

1744

}

1745

/* Lower privileges */

1746

errno = 0;

1747

ret = seteuid(uid);

1748

if(ret == -1){

1749

perror_plus("seteuid");

1750

}

2049

1751

}

2050

1752

2051

1753

if(not debug){

2052

1754

avahi_set_log_function(empty_log);

2053

1755

}

2054

1756

1757

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

1758

struct dirent **direntries;

1759

/* First look for interfaces that are up */

1760

ret = scandir(sys_class_net, &direntries, up_interface,

1761

alphasort);

1762

if(ret == 0){

1763

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

1764

free(direntries);

1765

ret = scandir(sys_class_net, &direntries, good_interface,

1766

alphasort);

1767

}

1768

if(ret >= 1){

1769

/* Pick the first interface returned */

1770

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

1771

if(debug){

1772

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

1773

}

1774

if(interface == NULL){

1775

perror_plus("malloc");

1776

free(direntries);

1777

exitcode = EXIT_FAILURE;

1778

goto end;

1779

}

1780

free(direntries);

1781

} else {

1782

free(direntries);

1783

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

1784

exitcode = EXIT_FAILURE;

1785

goto end;

1786

}

1787

}

1788

2055

1789

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

2056

1790

from the signal handler */

2057

1791

/* Initialize the pseudo-RNG for Avahi */

2058

1792

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

2059

simple_poll = avahi_simple_poll_new();

2060

if(simple_poll == NULL){

1793

mc.simple_poll = avahi_simple_poll_new();

1794

if(mc.simple_poll == NULL){

2061

1795

fprintf_plus(stderr,

2062

1796

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

2063

1797

exitcode = EX_UNAVAILABLE;

2127

1861

}

2128

1862

}

2129

1863

2130

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

2131

if(mc.interfaces == NULL){

2132

struct dirent **direntries;

2133

/* Look for any good interfaces */

2134

ret = scandir(sys_class_net, &direntries, good_interface,

2135

alphasort);

2136

if(ret >= 1){

2137

/* Add all found interfaces to interfaces list */

2138

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

2139

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

2140

direntries[i]->d_name);

2141

if(ret_errno != 0){

2142

perror_plus("argz_add");

2143

continue;

2144

}

2145

if(debug){

2146

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

2147

direntries[i]->d_name);

2148

}

2149

}

2150

free(direntries);

2151

} else {

2152

free(direntries);

2153

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

2154

exitcode = EXIT_FAILURE;

2155

goto end;

2156

}

2157

}

2158

2159

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

2160

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

2161

if(debug){

2162

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

2163

mc.interfaces);

2164

}

2165

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

2166

}

2167

2168

/* Bring up interfaces which are down */

2169

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

2170

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

2171

char *interface = NULL;

2172

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

2173

interface))){

2174

bool interface_was_up = interface_is_up(interface);

2175

ret = bring_up_interface(interface, delay);

2176

if(not interface_was_up){

2177

if(ret != 0){

2178

errno = ret;

2179

perror_plus("Failed to bring up interface");

2180

} else {

2181

ret_errno = argz_add(&interfaces_to_take_down,

2182

&interfaces_to_take_down_size,

2183

interface);

2184

}

2185

}

2186

}

2187

free(mc.interfaces);

2188

mc.interfaces = NULL;

2189

mc.interfaces_size = 0;

2190

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

2191

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

1864

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

1865

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

1866

if_index = (AvahiIfIndex) if_nametoindex(interface);

1867

if(if_index == 0){

1868

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

1869

exitcode = EX_UNAVAILABLE;

1870

goto end;

1871

}

1872

1873

if(quit_now){

1874

goto end;

1875

}

1876

1877

/* Re-raise priviliges */

1878

errno = 0;

1879

ret = seteuid(0);

1880

if(ret == -1){

1881

perror_plus("seteuid");

1882

}

1883

1884

#ifdef __linux__

1885

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1886

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

1887

ret = klogctl(8, NULL, 5);

1888

bool restore_loglevel = true;

1889

if(ret == -1){

1890

restore_loglevel = false;

1891

perror_plus("klogctl");

1892

}

1893

#endif /* __linux__ */

1894

1895

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1896

if(sd < 0){

1897

perror_plus("socket");

1898

exitcode = EX_OSERR;

1899

#ifdef __linux__

1900

if(restore_loglevel){

1901

ret = klogctl(7, NULL, 0);

1902

if(ret == -1){

1903

perror_plus("klogctl");

1904

}

1905

}

1906

#endif /* __linux__ */

1907

/* Lower privileges */

1908

errno = 0;

1909

ret = seteuid(uid);

1910

if(ret == -1){

1911

perror_plus("seteuid");

1912

}

1913

goto end;

1914

}

1915

strcpy(network.ifr_name, interface);

1916

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

1917

if(ret == -1){

1918

perror_plus("ioctl SIOCGIFFLAGS");

1919

#ifdef __linux__

1920

if(restore_loglevel){

1921

ret = klogctl(7, NULL, 0);

1922

if(ret == -1){

1923

perror_plus("klogctl");

1924

}

1925

}

1926

#endif /* __linux__ */

1927

exitcode = EX_OSERR;

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1934

goto end;

1935

}

1936

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

1937

network.ifr_flags |= IFF_UP;

1938

take_down_interface = true;

1939

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

1940

if(ret == -1){

1941

take_down_interface = false;

1942

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1943

exitcode = EX_OSERR;

1944

#ifdef __linux__

1945

if(restore_loglevel){

1946

ret = klogctl(7, NULL, 0);

1947

if(ret == -1){

1948

perror_plus("klogctl");

1949

}

1950

}

1951

#endif /* __linux__ */

1952

/* Lower privileges */

1953

errno = 0;

1954

ret = seteuid(uid);

1955

if(ret == -1){

1956

perror_plus("seteuid");

1957

}

1958

goto end;

1959

}

1960

}

1961

/* Sleep checking until interface is running.

1962

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

1963

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

1964

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

1965

if(ret == -1){

1966

perror_plus("ioctl SIOCGIFFLAGS");

1967

} else if(network.ifr_flags & IFF_RUNNING){

1968

break;

1969

}

1970

struct timespec sleeptime = { .tv_nsec = 250000000 };

1971

ret = nanosleep(&sleeptime, NULL);

1972

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

1973

perror_plus("nanosleep");

1974

}

1975

}

1976

if(not take_down_interface){

1977

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

1978

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

1979

if(ret == -1){

1980

perror_plus("close");

1981

}

1982

}

1983

#ifdef __linux__

1984

if(restore_loglevel){

1985

/* Restores kernel loglevel to default */

1986

ret = klogctl(7, NULL, 0);

1987

if(ret == -1){

1988

perror_plus("klogctl");

1989

}

1990

}

1991

#endif /* __linux__ */

1992

/* Lower privileges */

1993

errno = 0;

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

2192

1998

}

2193

1999

}

2194

2000

2196

2002

goto end;

2197

2003

}

2198

2004

2199

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

2005

ret = init_gnutls_global(pubkey, seckey);

2200

2006

if(ret == -1){

2201

2007

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

2202

2008

exitcode = EX_UNAVAILABLE;

2219

2025

goto end;

2220

2026

}

2221

2027

2222

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

2028

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

2223

2029

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

2224

2030

exitcode = EX_UNAVAILABLE;

2225

2031

goto end;

2235

2041

/* Connect directly, do not use Zeroconf */

2236

2042

/* (Mainly meant for debugging) */

2237

2043

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

2238

2239

2044

if(address == NULL){

2240

2045

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

2241

2046

exitcode = EX_USAGE;

2246

2051

goto end;

2247

2052

}

2248

2053

2249

in_port_t port;

2054

uint16_t port;

2250

2055

errno = 0;

2251

2056

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

2252

2057

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

2253

or tmpmax != (in_port_t)tmpmax){

2058

or tmpmax != (uint16_t)tmpmax){

2254

2059

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

2255

2060

exitcode = EX_USAGE;

2256

2061

goto end;

2260

2065

goto end;

2261

2066

}

2262

2067

2263

port = (in_port_t)tmpmax;

2068

port = (uint16_t)tmpmax;

2264

2069

*address = '\0';

2265

2070

/* Colon in address indicates IPv6 */

2266

2071

int af;

2282

2087

}

2283

2088

2284

2089

while(not quit_now){

2285

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

2286

&mc);

2090

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

2287

2091

if(quit_now or ret == 0){

2288

2092

break;

2289

2093

}

2315

2119

config.publish_domain = 0;

2316

2120

2317

2121

/* Allocate a new server */

2318

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2319

&config, NULL, NULL, &ret_errno);

2122

mc.server = avahi_server_new(avahi_simple_poll_get

2123

(mc.simple_poll), &config, NULL,

2124

NULL, &error);

2320

2125

2321

2126

/* Free the Avahi configuration data */

2322

2127

avahi_server_config_free(&config);

2325

2130

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

2326

2131

if(mc.server == NULL){

2327

2132

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

2328

avahi_strerror(ret_errno));

2133

avahi_strerror(error));

2329

2134

exitcode = EX_UNAVAILABLE;

2330

2135

goto end;

2331

2136

}

2337

2142

/* Create the Avahi service browser */

2338

2143

sb = avahi_s_service_browser_new(mc.server, if_index,

2339

2144

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2340

NULL, 0, browse_callback,

2341

(void *)&mc);

2145

NULL, 0, browse_callback, NULL);

2342

2146

if(sb == NULL){

2343

2147

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

2344

2148

avahi_strerror(avahi_server_errno(mc.server)));

2356

2160

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

2357

2161

}

2358

2162

2359

ret = avahi_loop_with_timeout(simple_poll,

2360

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

2163

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

(int)(retry_interval * 1000));

2361

2165

if(debug){

2362

2166

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

2363

2167

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

2376

2180

if(mc.server != NULL)

2377

2181

avahi_server_free(mc.server);

2378

2182

2379

if(simple_poll != NULL)

2380

avahi_simple_poll_free(simple_poll);

2183

if(mc.simple_poll != NULL)

2184

avahi_simple_poll_free(mc.simple_poll);

2381

2185

2382

2186

if(gnutls_initialized){

2383

2187

gnutls_certificate_free_credentials(mc.cred);

2388

2192

if(gpgme_initialized){

2389

2193

gpgme_release(mc.ctx);

2390

2194

}

2391

2195

2392

2196

/* Cleans up the circular linked list of Mandos servers the client

2393

2197

has seen */

2394

2198

if(mc.current_server != NULL){

2402

2206

2403

2207

/* Re-raise priviliges */

2404

2208

{

2405

raise_privileges();

2406

2209

errno = 0;

2210

ret = seteuid(0);

2211

if(ret == -1){

2212

perror_plus("seteuid");

2213

}

2407

2214

/* Run network hooks */

2408

run_network_hooks("stop", interfaces_hooks != NULL ?

2409

interfaces_hooks : "", delay);

2215

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

2216

goto end;

2217

}

2410

2218

2411

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

2412

{

2413

char *interface = NULL;

2414

while((interface=argz_next(interfaces_to_take_down,

2415

interfaces_to_take_down_size,

2416

interface))){

2417

ret_errno = take_down_interface(interface);

2418

if(ret_errno != 0){

2419

errno = ret_errno;

2420

perror_plus("Failed to take down interface");

2219

/* Take down the network interface */

2220

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

2221

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

2222

if(ret == -1){

2223

perror_plus("ioctl SIOCGIFFLAGS");

2224

} else if(network.ifr_flags & IFF_UP){

2225

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

2226

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

2227

if(ret == -1){

2228

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2421

2229

}

2422

2230

}

2423

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

2424

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

2425

" down\n");

2231

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

2232

if(ret == -1){

2233

perror_plus("close");

2426

2234

}

2427

2235

}

2428

2429

lower_privileges_permanently();

2430

}

2431

2432

free(interfaces_to_take_down);

2433

free(interfaces_hooks);

2236

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2434

2243

2435

2244

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

2436

2245

if(tempdir_created){