/mandos/release : revision 297

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

10

*

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* Everything else is

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13

12

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

41

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

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stdout, ferror(), remove() */

44

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

44

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

45

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

46

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

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strtof(), abort() */

55

opendir(), DIR */

56

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

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

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inet_pton(), connect(),

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getnameinfo() */

58

inet_pton(), connect() */

60

59

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

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

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61

*/

63

62

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

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63

strtoimax() */

64

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

65

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

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program_invocation_short_name */

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

74

#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() */

77

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

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

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

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argp_state, struct argp,

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

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WEXITSTATUS(), WTERMSIG() */

90

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

91

#include <argz.h> /* argz_add_sep(), argz_next(),

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

94

argz_count() */

95

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

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EAI_SYSTEM, gai_strerror() */

97

91

98

92

#ifdef __linux__

99

93

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

141

135

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

142

136

char *connect_to = NULL;

143

137

const char *hookdir = HOOKDIR;

144

uid_t uid = 65534;

145

gid_t gid = 65534;

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138

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

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typedef struct server{

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141

const char *ip;

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in_port_t port;

142

uint16_t port;

151

143

AvahiIfIndex if_index;

152

144

int af;

153

145

struct timespec last_seen;

157

149

158

150

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

159

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typedef struct {

152

AvahiSimplePoll *simple_poll;

160

153

AvahiServer *server;

161

154

gnutls_certificate_credentials_t cred;

162

155

unsigned int dh_bits;

164

157

const char *priority;

165

158

gpgme_ctx_t ctx;

166

159

server *current_server;

167

char *interfaces;

168

size_t interfaces_size;

169

160

} mandos_context;

170

161

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/* global so signal handler can reach it*/

172

AvahiSimplePoll *simple_poll;

162

/* global context so signal handler can reach it*/

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mandos_context mc = { .simple_poll = NULL, .server = NULL,

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.dh_bits = 1024, .priority = "SECURE256"

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":!CTYPE-X.509:+CTYPE-OPENPGP",

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.current_server = NULL };

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167

174

168

sig_atomic_t quit_now = 0;

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int signal_received = 0;

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191

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

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program_invocation_short_name));

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

187

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

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188

}

195

189

196

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/*

201

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size_t incbuffer(char **buffer, size_t buffer_length,

202

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size_t buffer_capacity){

203

197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

204

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

205

if(new_buf == NULL){

206

int old_errno = errno;

207

free(*buffer);

208

errno = old_errno;

209

*buffer = NULL;

198

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

199

if(buffer == NULL){

210

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return 0;

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}

212

*buffer = new_buf;

213

202

buffer_capacity += BUFFER_SIZE;

214

203

}

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return buffer_capacity;

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205

}

217

206

218

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

219

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

220

int af, server **current_server){

208

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

209

int af){

221

210

int ret;

222

211

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

223

212

if(new_server == NULL){

232

221

perror_plus("strdup");

233

222

return false;

234

223

}

235

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

236

if(ret == -1){

237

perror_plus("clock_gettime");

238

return false;

239

}

240

224

/* Special case of first server */

241

if(*current_server == NULL){

225

if (mc.current_server == NULL){

242

226

new_server->next = new_server;

243

227

new_server->prev = new_server;

244

*current_server = new_server;

228

mc.current_server = new_server;

245

229

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

246

230

} else {

247

new_server->next = *current_server;

248

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

231

new_server->next = mc.current_server;

232

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

249

233

new_server->prev->next = new_server;

250

(*current_server)->prev = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

251

240

}

252

241

return true;

253

242

}

256

245

* Initialize GPGME.

257

246

*/

258

247

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

259

const char *tempdir, mandos_context *mc){

248

const char *tempdir){

260

249

gpgme_error_t rc;

261

250

gpgme_engine_info_t engine_info;

262

251

252

263

253

/*

264

254

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

265

255

*/

281

271

return false;

282

272

}

283

273

284

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

274

rc = gpgme_op_import(mc.ctx, pgp_data);

285

275

if(rc != GPG_ERR_NO_ERROR){

286

276

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

287

277

gpgme_strsource(rc), gpgme_strerror(rc));

331

321

}

332

322

333

323

/* Create new GPGME "context" */

334

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

324

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

335

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if(rc != GPG_ERR_NO_ERROR){

336

326

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

337

327

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

352

342

*/

353

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

354

344

size_t crypto_size,

355

char **plaintext,

356

mandos_context *mc){

345

char **plaintext){

357

346

gpgme_data_t dh_crypto, dh_plain;

358

347

gpgme_error_t rc;

359

348

ssize_t ret;

385

374

386

375

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

387

376

data buffer */

388

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

377

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

389

378

if(rc != GPG_ERR_NO_ERROR){

390

379

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

391

380

gpgme_strsource(rc), gpgme_strerror(rc));

392

381

plaintext_length = -1;

393

382

if(debug){

394

383

gpgme_decrypt_result_t result;

395

result = gpgme_op_decrypt_result(mc->ctx);

384

result = gpgme_op_decrypt_result(mc.ctx);

396

385

if(result == NULL){

397

386

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

398

387

} else {

476

465

}

477

466

478

467

static const char * safer_gnutls_strerror(int value){

479

const char *ret = gnutls_strerror(value);

468

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

469

-Wunreachable-code */

480

470

if(ret == NULL)

481

471

ret = "(unknown)";

482

472

return ret;

489

479

}

490

480

491

481

static int init_gnutls_global(const char *pubkeyfilename,

492

const char *seckeyfilename,

493

mandos_context *mc){

482

const char *seckeyfilename){

494

483

int ret;

495

484

496

485

if(debug){

513

502

}

514

503

515

504

/* OpenPGP credentials */

516

ret = gnutls_certificate_allocate_credentials(&mc->cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

517

506

if(ret != GNUTLS_E_SUCCESS){

518

507

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

519

508

safer_gnutls_strerror(ret));

529

518

}

530

519

531

520

ret = gnutls_certificate_set_openpgp_key_file

532

(mc->cred, pubkeyfilename, seckeyfilename,

521

(mc.cred, pubkeyfilename, seckeyfilename,

533

522

GNUTLS_OPENPGP_FMT_BASE64);

534

523

if(ret != GNUTLS_E_SUCCESS){

535

524

fprintf_plus(stderr,

541

530

}

542

531

543

532

/* GnuTLS server initialization */

544

ret = gnutls_dh_params_init(&mc->dh_params);

533

ret = gnutls_dh_params_init(&mc.dh_params);

545

534

if(ret != GNUTLS_E_SUCCESS){

546

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

547

536

" initialization: %s\n",

548

537

safer_gnutls_strerror(ret));

549

538

goto globalfail;

550

539

}

551

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

540

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

552

541

if(ret != GNUTLS_E_SUCCESS){

553

542

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

554

543

safer_gnutls_strerror(ret));

555

544

goto globalfail;

556

545

}

557

546

558

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

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

559

548

560

549

return 0;

561

550

562

551

globalfail:

563

552

564

gnutls_certificate_free_credentials(mc->cred);

553

gnutls_certificate_free_credentials(mc.cred);

565

554

gnutls_global_deinit();

566

gnutls_dh_params_deinit(mc->dh_params);

555

gnutls_dh_params_deinit(mc.dh_params);

567

556

return -1;

568

557

}

569

558

570

static int init_gnutls_session(gnutls_session_t *session,

571

mandos_context *mc){

559

static int init_gnutls_session(gnutls_session_t *session){

572

560

int ret;

573

561

/* GnuTLS session creation */

574

562

do {

586

574

{

587

575

const char *err;

588

576

do {

589

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

577

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

590

578

if(quit_now){

591

579

gnutls_deinit(*session);

592

580

return -1;

603

591

604

592

do {

605

593

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

606

mc->cred);

594

mc.cred);

607

595

if(quit_now){

608

596

gnutls_deinit(*session);

609

597

return -1;

619

607

/* ignore client certificate if any. */

620

608

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

621

609

622

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

623

611

624

612

return 0;

625

613

}

629

617

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

630

618

631

619

/* Called when a Mandos server is found */

632

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

620

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

633

621

AvahiIfIndex if_index,

634

int af, mandos_context *mc){

622

int af){

635

623

int ret, tcp_sd = -1;

636

624

ssize_t sret;

637

625

union {

667

655

return -1;

668

656

}

669

657

670

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

671

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

672

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

673

bool match = false;

674

{

675

char *interface = NULL;

676

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

677

interface))){

678

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

679

match = true;

680

break;

681

}

682

}

683

}

684

if(not match){

685

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

686

connect to the server */

687

if(debug){

688

char interface[IF_NAMESIZE];

689

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

690

perror_plus("if_indextoname");

691

} else {

692

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

693

" \"%s\"\n",

694

if_indextoname((unsigned int)if_index,

695

interface));

696

}

697

}

698

return -1;

699

}

700

}

701

702

ret = init_gnutls_session(&session, mc);

658

ret = init_gnutls_session(&session);

703

659

if(ret != 0){

704

660

return -1;

705

661

}

706

662

707

663

if(debug){

708

664

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

709

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

665

PRIu16 "\n", ip, port);

710

666

}

711

667

712

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

743

699

goto mandos_end;

744

700

}

745

701

if(af == AF_INET6){

746

to.in6.sin6_port = htons(port);

747

#ifdef __GNUC__

748

#pragma GCC diagnostic push

749

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

750

#endif

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

751

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

752

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

753

#ifdef __GNUC__

754

#pragma GCC diagnostic pop

755

#endif

707

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

708

-Wunreachable-code*/

756

709

if(if_index == AVAHI_IF_UNSPEC){

757

710

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

758

711

" incomplete without a network interface\n");

763

716

to.in6.sin6_scope_id = (uint32_t)if_index;

764

717

}

765

718

} else {

766

to.in.sin_port = htons(port);

719

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

720

-Wconversion and

721

-Wunreachable-code */

767

722

}

768

723

769

724

if(quit_now){

777

732

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

778

733

perror_plus("if_indextoname");

779

734

} else {

780

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

781

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

735

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

736

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

782

737

}

783

738

} else {

784

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

785

ip, (uintmax_t)port);

739

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

740

ip, port);

786

741

}

787

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

788

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

744

const char *pcret;

789

745

if(af == AF_INET6){

790

ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),

791

addrstr, sizeof(addrstr), NULL, 0,

792

NI_NUMERICHOST);

746

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

747

sizeof(addrstr));

793

748

} else {

794

ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

749

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

750

sizeof(addrstr));

797

751

}

798

if(ret == EAI_SYSTEM){

799

perror_plus("getnameinfo");

800

} else if(ret != 0) {

801

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

802

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

803

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

752

if(pcret == NULL){

753

perror_plus("inet_ntop");

754

} else {

755

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

756

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

757

}

804

758

}

805

759

}

806

760

867

821

goto mandos_end;

868

822

}

869

823

870

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

871

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

872

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

873

gnutls_transport_set_ptr(session,

874

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

875

826

876

827

if(quit_now){

877

828

errno = EINTR;

982

933

if(buffer_length > 0){

983

934

ssize_t decrypted_buffer_size;

984

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

985

&decrypted_buffer, mc);

936

&decrypted_buffer);

986

937

if(decrypted_buffer_size >= 0){

987

938

988

939

written = 0;

1049

1000

AVAHI_GCC_UNUSED AvahiStringList *txt,

1050

1001

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1051

1002

flags,

1052

void* mc){

1053

if(r == NULL){

1054

return;

1055

}

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1056

1005

1057

1006

/* Called whenever a service has been resolved successfully or

1058

1007

timed out */

1067

1016

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

1068

1017

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

1069

1018

domain,

1070

avahi_strerror(avahi_server_errno

1071

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

1019

avahi_strerror(avahi_server_errno(mc.server)));

1072

1020

break;

1073

1021

1074

1022

case AVAHI_RESOLVER_FOUND:

1080

1028

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

1081

1029

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

1082

1030

}

1083

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

1084

interface,

1085

avahi_proto_to_af(proto),

1086

mc);

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1087

1033

if(ret == 0){

1088

avahi_simple_poll_quit(simple_poll);

1034

avahi_simple_poll_quit(mc.simple_poll);

1089

1035

} else {

1090

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

1091

avahi_proto_to_af(proto),

1092

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

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1093

1038

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

1094

1039

" list\n", name);

1095

1040

}

1108

1053

const char *domain,

1109

1054

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1110

1055

flags,

1111

void* mc){

1112

if(b == NULL){

1113

return;

1114

}

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1115

1058

1116

1059

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

1117

1060

is removed from the LAN */

1125

1068

case AVAHI_BROWSER_FAILURE:

1126

1069

1127

1070

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

1128

avahi_strerror(avahi_server_errno

1129

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

1130

avahi_simple_poll_quit(simple_poll);

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1131

1073

return;

1132

1074

1133

1075

case AVAHI_BROWSER_NEW:

1136

1078

the callback function is called the Avahi server will free the

1137

1079

resolver for us. */

1138

1080

1139

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

1140

interface, protocol, name, type,

1141

domain, protocol, 0,

1142

resolve_callback, mc) == NULL)

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1143

1084

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

1144

1085

" %s\n", name,

1145

avahi_strerror(avahi_server_errno

1146

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

1086

avahi_strerror(avahi_server_errno(mc.server)));

1147

1087

break;

1148

1088

1149

1089

case AVAHI_BROWSER_REMOVE:

1168

1108

signal_received = sig;

1169

1109

int old_errno = errno;

1170

1110

/* set main loop to exit */

1171

if(simple_poll != NULL){

1172

avahi_simple_poll_quit(simple_poll);

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1173

1113

}

1174

1114

errno = old_errno;

1175

1115

}

1176

1116

1177

1117

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

1178

1118

int ret;

1179

error_t ret_errno;

1180

1119

1181

1120

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

1182

1121

if(s < 0){

1183

ret_errno = errno;

1184

1122

perror_plus("socket");

1185

errno = ret_errno;

1186

1123

return false;

1187

1124

}

1188

1125

strcpy(ifr->ifr_name, ifname);

1189

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1190

1127

if(ret == -1){

1191

1128

if(debug){

1192

ret_errno = errno;

1193

1129

perror_plus("ioctl SIOCGIFFLAGS");

1194

errno = ret_errno;

1195

1130

}

1196

1131

return false;

1197

1132

}

1266

1201

}

1267

1202

1268

1203

/*

1269

* This function determines if a network interface is up.

1270

*/

1271

bool interface_is_up(const char *interface){

1272

struct ifreq ifr;

1273

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

1274

if(debug){

1275

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

1276

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

1277

}

1278

return false;

1279

}

1280

1281

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

1282

}

1283

1284

/*

1285

* This function determines if a network interface is running

1286

*/

1287

bool interface_is_running(const char *interface){

1288

struct ifreq ifr;

1289

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

1290

if(debug){

1291

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

1292

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

1293

}

1294

return false;

1295

}

1296

1297

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

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1298

1244

}

1299

1245

1300

1246

int notdotentries(const struct dirent *direntry){

1369

1315

return 1;

1370

1316

}

1371

1317

1372

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1373

mandos_context *mc){

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1374

1319

int ret;

1375

1320

struct timespec now;

1376

1321

struct timespec waited_time;

1377

1322

intmax_t block_time;

1378

1323

1379

1324

while(true){

1380

if(mc->current_server == NULL){

1325

if(mc.current_server == NULL){

1381

1326

if (debug){

1382

1327

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

1383

1328

" No timeout!\n");

1397

1342

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

1398

1343

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

1399

1344

waited_time.tv_sec = (now.tv_sec

1400

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

1345

- mc.current_server->last_seen.tv_sec);

1401

1346

waited_time.tv_nsec = (now.tv_nsec

1402

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

1347

- mc.current_server->last_seen.tv_nsec);

1403

1348

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

1404

1349

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

1405

1350

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

1413

1358

}

1414

1359

1415

1360

if(block_time <= 0){

1416

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

1417

mc->current_server->port,

1418

mc->current_server->if_index,

1419

mc->current_server->af, mc);

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

1420

1365

if(ret == 0){

1421

avahi_simple_poll_quit(s);

1366

avahi_simple_poll_quit(mc.simple_poll);

1422

1367

return 0;

1423

1368

}

1424

1369

ret = clock_gettime(CLOCK_MONOTONIC,

1425

&mc->current_server->last_seen);

1370

&mc.current_server->last_seen);

1426

1371

if(ret == -1){

1427

1372

perror_plus("clock_gettime");

1428

1373

return -1;

1429

1374

}

1430

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

1375

mc.current_server = mc.current_server->next;

1431

1376

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

1432

1377

servers, but don't block */

1433

1378

}

1442

1387

}

1443

1388

}

1444

1389

1445

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

1446

error_t raise_privileges(void){

1447

error_t old_errno = errno;

1448

error_t ret_errno = 0;

1449

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

1450

ret_errno = errno;

1451

perror_plus("seteuid");

1452

}

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

1457

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

1458

error_t raise_privileges_permanently(void){

1459

error_t old_errno = errno;

1460

error_t ret_errno = raise_privileges();

1461

if(ret_errno != 0){

1462

errno = old_errno;

1463

return ret_errno;

1464

}

1465

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

1466

ret_errno = errno;

1467

perror_plus("seteuid");

1468

}

1469

errno = old_errno;

1470

return ret_errno;

1471

}

1472

1473

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

1474

error_t lower_privileges(void){

1475

error_t old_errno = errno;

1476

error_t ret_errno = 0;

1477

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

1478

ret_errno = errno;

1479

perror_plus("seteuid");

1480

}

1481

errno = old_errno;

1482

return ret_errno;

1483

}

1484

1485

/* Lower privileges permanently */

1486

error_t lower_privileges_permanently(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("setuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

1390

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

1498

1391

const float delay){

1499

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1500

1395

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

1501

1396

alphasort);

1502

1397

if(numhooks == -1){

1503

if(errno == ENOENT){

1504

if(debug){

1505

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

1506

" found\n", hookdir);

1507

}

1508

} else {

1509

perror_plus("scandir");

1510

}

1398

perror_plus("scandir");

1511

1399

} else {

1512

struct dirent *direntry;

1513

int ret;

1514

1400

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

1515

1401

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

1516

1402

direntry = direntries[i];

1528

1414

if(hook_pid == 0){

1529

1415

/* Child */

1530

1416

/* Raise privileges */

1531

raise_privileges_permanently();

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1532

1428

/* Set group */

1533

1429

errno = 0;

1534

1430

ret = setgid(0);

1627

1523

return true;

1628

1524

}

1629

1525

1630

error_t bring_up_interface(const char *const interface,

1631

const float delay){

1632

int sd = -1;

1633

error_t old_errno = errno;

1634

error_t ret_errno = 0;

1635

int ret, ret_setflags;

1636

struct ifreq network;

1637

unsigned int if_index = if_nametoindex(interface);

1638

if(if_index == 0){

1639

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

1640

errno = old_errno;

1641

return ENXIO;

1642

}

1643

1644

if(quit_now){

1645

errno = old_errno;

1646

return EINTR;

1647

}

1648

1649

if(not interface_is_up(interface)){

1650

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

1651

ret_errno = errno;

1652

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

1653

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

1654

return ret_errno;

1655

}

1656

network.ifr_flags |= IFF_UP;

1657

1658

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1659

if(sd < 0){

1660

ret_errno = errno;

1661

perror_plus("socket");

1662

errno = old_errno;

1663

return ret_errno;

1664

}

1665

1666

if(quit_now){

1667

close(sd);

1668

errno = old_errno;

1669

return EINTR;

1670

}

1671

1672

if(debug){

1673

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

1674

interface);

1675

}

1676

1677

/* Raise priviliges */

1678

raise_privileges();

1679

1680

#ifdef __linux__

1681

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1682

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

1683

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

1684

bool restore_loglevel = true;

1685

if(ret_linux == -1){

1686

restore_loglevel = false;

1687

perror_plus("klogctl");

1688

}

1689

#endif /* __linux__ */

1690

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

1691

ret_errno = errno;

1692

#ifdef __linux__

1693

if(restore_loglevel){

1694

ret_linux = klogctl(7, NULL, 0);

1695

if(ret_linux == -1){

1696

perror_plus("klogctl");

1697

}

1698

}

1699

#endif /* __linux__ */

1700

1701

/* Lower privileges */

1702

lower_privileges();

1703

1704

/* Close the socket */

1705

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

1706

if(ret == -1){

1707

perror_plus("close");

1708

}

1709

1710

if(ret_setflags == -1){

1711

errno = ret_errno;

1712

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1713

errno = old_errno;

1714

return ret_errno;

1715

}

1716

} else if(debug){

1717

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

1718

interface);

1719

}

1720

1721

/* Sleep checking until interface is running.

1722

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

1723

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

1724

if(interface_is_running(interface)){

1725

break;

1726

}

1727

struct timespec sleeptime = { .tv_nsec = 250000000 };

1728

ret = nanosleep(&sleeptime, NULL);

1729

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

1730

perror_plus("nanosleep");

1731

}

1732

}

1733

1734

errno = old_errno;

1735

return 0;

1736

}

1737

1738

error_t take_down_interface(const char *const interface){

1739

error_t old_errno = errno;

1740

struct ifreq network;

1741

unsigned int if_index = if_nametoindex(interface);

1742

if(if_index == 0){

1743

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

1744

errno = old_errno;

1745

return ENXIO;

1746

}

1747

if(interface_is_up(interface)){

1748

error_t ret_errno = 0;

1749

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

1750

ret_errno = errno;

1751

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

1752

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

1753

return ret_errno;

1754

}

1755

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

1756

1757

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

1758

if(sd < 0){

1759

ret_errno = errno;

1760

perror_plus("socket");

1761

errno = old_errno;

1762

return ret_errno;

1763

}

1764

1765

if(debug){

1766

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

1767

interface);

1768

}

1769

1770

/* Raise priviliges */

1771

raise_privileges();

1772

1773

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

1774

ret_errno = errno;

1775

1776

/* Lower privileges */

1777

lower_privileges();

1778

1779

/* Close the socket */

1780

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

1781

if(ret == -1){

1782

perror_plus("close");

1783

}

1784

1785

if(ret_setflags == -1){

1786

errno = ret_errno;

1787

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1788

errno = old_errno;

1789

return ret_errno;

1790

}

1791

} else if(debug){

1792

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

1793

interface);

1794

}

1795

1796

errno = old_errno;

1797

return 0;

1798

}

1799

1800

1526

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

1801

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

1802

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

1803

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

1804

.interfaces = NULL, .interfaces_size = 0 };

1805

1527

AvahiSServiceBrowser *sb = NULL;

1806

error_t ret_errno;

1528

int error;

1807

1529

int ret;

1808

1530

intmax_t tmpmax;

1809

1531

char *tmp;

1810

1532

int exitcode = EXIT_SUCCESS;

1811

char *interfaces_to_take_down = NULL;

1812

size_t interfaces_to_take_down_size = 0;

1533

const char *interface = "";

1534

struct ifreq network;

1535

int sd = -1;

1536

bool take_down_interface = false;

1537

uid_t uid;

1538

gid_t gid;

1813

1539

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

1814

1540

bool tempdir_created = false;

1815

1541

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1816

1542

const char *seckey = PATHDIR "/" SECKEY;

1817

1543

const char *pubkey = PATHDIR "/" PUBKEY;

1818

char *interfaces_hooks = NULL;

1819

1544

1820

1545

bool gnutls_initialized = false;

1821

1546

bool gpgme_initialized = false;

1912

1637

connect_to = arg;

1913

1638

break;

1914

1639

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

1915

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

1916

arg, (int)',');

1917

if(ret_errno != 0){

1918

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

1919

}

1640

interface = arg;

1920

1641

break;

1921

1642

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

1922

1643

seckey = arg;

2000

1721

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

2001

1722

2002

1723

/* Re-raise priviliges */

2003

if(raise_privileges() == 0){

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

1728

} else {

2004

1729

struct stat st;

2005

1730

2006

1731

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

2046

1771

}

2047

1772

2048

1773

/* Lower privileges */

2049

lower_privileges();

2050

}

2051

}

2052

2053

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

2054

{

2055

char *interface = NULL;

2056

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

2057

interface))){

2058

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

2059

and if_nametoindex(interface) == 0){

2060

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

2061

fprintf_plus(stderr, "Not using nonexisting interface"

2062

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

2063

}

2064

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

2065

interface = NULL;

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

2066

1778

}

2067

1779

}

2068

1780

}

2069

1781

2070

1782

/* Run network hooks */

2071

{

2072

if(mc.interfaces != NULL){

2073

interfaces_hooks = malloc(mc.interfaces_size);

2074

if(interfaces_hooks == NULL){

2075

perror_plus("malloc");

2076

goto end;

2077

}

2078

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

2079

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

2080

}

2081

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

2082

interfaces_hooks : "", delay)){

2083

goto end;

2084

}

1783

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

1784

goto end;

2085

1785

}

2086

1786

2087

1787

if(not debug){

2088

1788

avahi_set_log_function(empty_log);

2089

1789

}

2090

1790

1791

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

1792

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1795

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

if(ret >= 1){

1803

/* Pick the first interface returned */

1804

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

1805

if(debug){

1806

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

1807

}

1808

if(interface == NULL){

1809

perror_plus("malloc");

1810

free(direntries);

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

free(direntries);

1815

} else {

1816

free(direntries);

1817

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

1818

exitcode = EXIT_FAILURE;

1819

goto end;

1820

}

1821

}

1822

2091

1823

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

2092

1824

from the signal handler */

2093

1825

/* Initialize the pseudo-RNG for Avahi */

2094

1826

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

2095

simple_poll = avahi_simple_poll_new();

2096

if(simple_poll == NULL){

1827

mc.simple_poll = avahi_simple_poll_new();

1828

if(mc.simple_poll == NULL){

2097

1829

fprintf_plus(stderr,

2098

1830

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

2099

1831

exitcode = EX_UNAVAILABLE;

2163

1895

}

2164

1896

}

2165

1897

2166

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

2167

if(mc.interfaces == NULL){

2168

struct dirent **direntries;

2169

/* Look for any good interfaces */

2170

ret = scandir(sys_class_net, &direntries, good_interface,

2171

alphasort);

2172

if(ret >= 1){

2173

/* Add all found interfaces to interfaces list */

2174

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

2175

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

2176

direntries[i]->d_name);

2177

if(ret_errno != 0){

2178

errno = ret_errno;

2179

perror_plus("argz_add");

2180

continue;

2181

}

2182

if(debug){

2183

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

2184

direntries[i]->d_name);

2185

}

2186

}

2187

free(direntries);

2188

} else {

2189

free(direntries);

2190

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

2191

exitcode = EXIT_FAILURE;

2192

goto end;

2193

}

2194

}

2195

2196

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

2197

{

2198

char *interface = NULL;

2199

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

2200

interface))){

2201

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

2202

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

2203

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

2204

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

2205

interface);

2206

interface = NULL;

2207

while((interface = argz_next(mc.interfaces,

2208

mc.interfaces_size, interface))){

2209

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

2210

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

2211

interface);

2212

interface = NULL;

1898

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

1899

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

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

if(if_index == 0){

1902

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

1903

exitcode = EX_UNAVAILABLE;

1904

goto end;

1905

}

1906

1907

if(quit_now){

1908

goto end;

1909

}

1910

1911

/* Re-raise priviliges */

1912

errno = 0;

1913

ret = seteuid(0);

1914

if(ret == -1){

1915

perror_plus("seteuid");

1916

}

1917

1918

#ifdef __linux__

1919

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1920

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

1921

ret = klogctl(8, NULL, 5);

1922

bool restore_loglevel = true;

1923

if(ret == -1){

1924

restore_loglevel = false;

1925

perror_plus("klogctl");

1926

}

1927

#endif /* __linux__ */

1928

1929

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1930

if(sd < 0){

1931

perror_plus("socket");

1932

exitcode = EX_OSERR;

1933

#ifdef __linux__

1934

if(restore_loglevel){

1935

ret = klogctl(7, NULL, 0);

1936

if(ret == -1){

1937

perror_plus("klogctl");

1938

}

1939

}

1940

#endif /* __linux__ */

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

strcpy(network.ifr_name, interface);

1950

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

1951

if(ret == -1){

1952

perror_plus("ioctl SIOCGIFFLAGS");

1953

#ifdef __linux__

1954

if(restore_loglevel){

1955

ret = klogctl(7, NULL, 0);

1956

if(ret == -1){

1957

perror_plus("klogctl");

1958

}

1959

}

1960

#endif /* __linux__ */

1961

exitcode = EX_OSERR;

1962

/* Lower privileges */

1963

errno = 0;

1964

ret = seteuid(uid);

1965

if(ret == -1){

1966

perror_plus("seteuid");

1967

}

1968

goto end;

1969

}

1970

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

1971

network.ifr_flags |= IFF_UP;

1972

take_down_interface = true;

1973

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

1974

if(ret == -1){

1975

take_down_interface = false;

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1977

exitcode = EX_OSERR;

1978

#ifdef __linux__

1979

if(restore_loglevel){

1980

ret = klogctl(7, NULL, 0);

1981

if(ret == -1){

1982

perror_plus("klogctl");

2213

1983

}

2214

1984

}

1985

#endif /* __linux__ */

1986

/* Lower privileges */

1987

errno = 0;

1988

ret = seteuid(uid);

1989

if(ret == -1){

1990

perror_plus("seteuid");

1991

}

1992

goto end;

1993

}

1994

}

1995

/* Sleep checking until interface is running.

1996

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

1997

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

1998

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

1999

if(ret == -1){

2000

perror_plus("ioctl SIOCGIFFLAGS");

2001

} else if(network.ifr_flags & IFF_RUNNING){

2215

2002

break;

2216

2003

}

2217

bool interface_was_up = interface_is_up(interface);

2218

ret = bring_up_interface(interface, delay);

2219

if(not interface_was_up){

2220

if(ret != 0){

2221

errno = ret;

2222

perror_plus("Failed to bring up interface");

2223

} else {

2224

ret_errno = argz_add(&interfaces_to_take_down,

2225

&interfaces_to_take_down_size,

2226

interface);

2227

if(ret_errno != 0){

2228

errno = ret_errno;

2229

perror_plus("argz_add");

2230

}

2231

}

2232

}

2233

}

2234

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

2235

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

2236

}

2237

}

2238

2239

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

2240

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

2241

if(debug){

2242

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

2243

mc.interfaces);

2244

}

2245

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

2004

struct timespec sleeptime = { .tv_nsec = 250000000 };

2005

ret = nanosleep(&sleeptime, NULL);

2006

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

2007

perror_plus("nanosleep");

2008

}

2009

}

2010

if(not take_down_interface){

2011

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

2012

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

2013

if(ret == -1){

2014

perror_plus("close");

2015

}

2016

}

2017

#ifdef __linux__

2018

if(restore_loglevel){

2019

/* Restores kernel loglevel to default */

2020

ret = klogctl(7, NULL, 0);

2021

if(ret == -1){

2022

perror_plus("klogctl");

2023

}

2024

}

2025

#endif /* __linux__ */

2026

/* Lower privileges */

2027

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

2032

}

2246

2033

}

2247

2034

2248

2035

if(quit_now){

2249

2036

goto end;

2250

2037

}

2251

2038

2252

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

2039

ret = init_gnutls_global(pubkey, seckey);

2253

2040

if(ret == -1){

2254

2041

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

2255

2042

exitcode = EX_UNAVAILABLE;

2272

2059

goto end;

2273

2060

}

2274

2061

2275

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

2062

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

2276

2063

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

2277

2064

exitcode = EX_UNAVAILABLE;

2278

2065

goto end;

2288

2075

/* Connect directly, do not use Zeroconf */

2289

2076

/* (Mainly meant for debugging) */

2290

2077

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

2291

2292

2078

if(address == NULL){

2293

2079

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

2294

2080

exitcode = EX_USAGE;

2299

2085

goto end;

2300

2086

}

2301

2087

2302

in_port_t port;

2088

uint16_t port;

2303

2089

errno = 0;

2304

2090

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

2305

2091

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

2306

or tmpmax != (in_port_t)tmpmax){

2092

or tmpmax != (uint16_t)tmpmax){

2307

2093

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

2308

2094

exitcode = EX_USAGE;

2309

2095

goto end;

2310

2096

}

2311

2097

2312

2098

if(quit_now){

2313

2099

goto end;

2314

2100

}

2315

2101

2316

port = (in_port_t)tmpmax;

2102

port = (uint16_t)tmpmax;

2317

2103

*address = '\0';

2318

2104

/* Colon in address indicates IPv6 */

2319

2105

int af;

2335

2121

}

2336

2122

2337

2123

while(not quit_now){

2338

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

2339

&mc);

2124

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

2340

2125

if(quit_now or ret == 0){

2341

2126

break;

2342

2127

}

2344

2129

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

2345

2130

(int)retry_interval);

2346

2131

}

2347

sleep((unsigned int)retry_interval);

2132

sleep((int)retry_interval);

2348

2133

}

2349

2134

2350

2135

if (not quit_now){

2368

2153

config.publish_domain = 0;

2369

2154

2370

2155

/* Allocate a new server */

2371

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2372

&config, NULL, NULL, &ret_errno);

2156

mc.server = avahi_server_new(avahi_simple_poll_get

2157

(mc.simple_poll), &config, NULL,

2158

NULL, &error);

2373

2159

2374

2160

/* Free the Avahi configuration data */

2375

2161

avahi_server_config_free(&config);

2378

2164

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

2379

2165

if(mc.server == NULL){

2380

2166

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

2381

avahi_strerror(ret_errno));

2167

avahi_strerror(error));

2382

2168

exitcode = EX_UNAVAILABLE;

2383

2169

goto end;

2384

2170

}

2390

2176

/* Create the Avahi service browser */

2391

2177

sb = avahi_s_service_browser_new(mc.server, if_index,

2392

2178

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2393

NULL, 0, browse_callback,

2394

(void *)&mc);

2179

NULL, 0, browse_callback, NULL);

2395

2180

if(sb == NULL){

2396

2181

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

2397

2182

avahi_strerror(avahi_server_errno(mc.server)));

2409

2194

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

2410

2195

}

2411

2196

2412

ret = avahi_loop_with_timeout(simple_poll,

2413

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

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

2414

2199

if(debug){

2415

2200

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

2416

2201

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

2423

2208

}

2424

2209

2425

2210

/* Cleanup things */

2426

free(mc.interfaces);

2427

2428

2211

if(sb != NULL)

2429

2212

avahi_s_service_browser_free(sb);

2430

2213

2431

2214

if(mc.server != NULL)

2432

2215

avahi_server_free(mc.server);

2433

2216

2434

if(simple_poll != NULL)

2435

avahi_simple_poll_free(simple_poll);

2217

if(mc.simple_poll != NULL)

2218

avahi_simple_poll_free(mc.simple_poll);

2436

2219

2437

2220

if(gnutls_initialized){

2438

2221

gnutls_certificate_free_credentials(mc.cred);

2455

2238

}

2456

2239

}

2457

2240

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2458

2244

/* Re-raise priviliges */

2459

2245

{

2460

raise_privileges();

2461

2462

/* Run network hooks */

2463

run_network_hooks("stop", interfaces_hooks != NULL ?

2464

interfaces_hooks : "", delay);

2465

2466

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

2467

{

2468

char *interface = NULL;

2469

while((interface=argz_next(interfaces_to_take_down,

2470

interfaces_to_take_down_size,

2471

interface))){

2472

ret_errno = take_down_interface(interface);

2473

if(ret_errno != 0){

2474

errno = ret_errno;

2475

perror_plus("Failed to take down interface");

2246

errno = 0;

2247

ret = seteuid(0);

2248

if(ret == -1){

2249

perror_plus("seteuid");

2250

}

2251

2252

/* Take down the network interface */

2253

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

2254

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

2255

if(ret == -1){

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

2258

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

2259

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

2260

if(ret == -1){

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2476

2262

}

2477

2263

}

2478

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

2479

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

2480

" down\n");

2264

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

2265

if(ret == -1){

2266

perror_plus("close");

2481

2267

}

2482

2268

}

2483

2484

lower_privileges_permanently();

2485

}

2486

2487

free(interfaces_to_take_down);

2488

free(interfaces_hooks);

2269

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2489

2276

2490

2277

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

2491

2278

if(tempdir_created){