/mandos/trunk : revision 708

9

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

10

*

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* Everything else is

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13

12

13

14

*

15

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

16

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

32

/* Needed by GPGME, specifically gpgme_data_seek() */

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

41

42

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

43

stdout, ferror(), remove() */

44

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

43

stdout, ferror() */

44

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

45

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

46

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

47

strtof(), abort() */

55

opendir(), DIR */

56

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

57

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

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inet_pton(), connect() */

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

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inet_pton(), connect(),

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getnameinfo() */

60

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

60

61

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

61

62

*/

62

63

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

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64

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() */

73

*/

74

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

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

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setgid(), pause() */

77

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

76

setgid(), pause(), _exit(),

77

unlinkat() */

78

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

78

79

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

79

80

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

80

81

argp_state, struct argp,

87

88

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

89

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

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90

WEXITSTATUS(), WTERMSIG() */

91

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

92

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

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argz_delete(), argz_append(),

94

argz_stringify(), argz_add(),

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

90

98

91

99

#ifdef __linux__

92

100

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

134

142

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

135

143

char *connect_to = NULL;

136

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

137

148

138

149

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

139

150

typedef struct server{

140

151

const char *ip;

141

uint16_t port;

152

in_port_t port;

142

153

AvahiIfIndex if_index;

143

154

int af;

144

155

struct timespec last_seen;

148

159

149

160

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

150

161

typedef struct {

151

AvahiSimplePoll *simple_poll;

152

162

AvahiServer *server;

153

163

gnutls_certificate_credentials_t cred;

154

164

unsigned int dh_bits;

156

166

const char *priority;

157

167

gpgme_ctx_t ctx;

158

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

159

171

} mandos_context;

160

172

161

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

162

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

163

.dh_bits = 1024, .priority = "SECURE256"

164

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

165

.current_server = NULL };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

166

175

167

176

sig_atomic_t quit_now = 0;

168

177

int signal_received = 0;

169

178

170

179

/* Function to use when printing errors */

171

180

void perror_plus(const char *print_text){

181

int e = errno;

172

182

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

173

183

program_invocation_short_name);

184

errno = e;

174

185

perror(print_text);

175

186

}

176

187

188

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

177

189

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

178

190

va_list ap;

179

191

va_start (ap, format);

180

192

181

193

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

182

194

program_invocation_short_name));

183

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

195

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

184

196

}

185

197

186

198

/*

188

200

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

189

201

* "buffer_length" is how much is already used.

190

202

*/

203

__attribute__((nonnull, warn_unused_result))

191

204

size_t incbuffer(char **buffer, size_t buffer_length,

192

205

size_t buffer_capacity){

193

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

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

195

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

196

213

return 0;

197

214

}

215

*buffer = new_buf;

198

216

buffer_capacity += BUFFER_SIZE;

199

217

}

200

218

return buffer_capacity;

201

219

}

202

220

203

221

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

204

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

205

int af){

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

206

225

int ret;

207

226

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

208

227

if(new_server == NULL){

209

228

perror_plus("malloc");

210

return -1;

229

return false;

211

230

}

212

231

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

213

232

.port = port,

215

234

.af = af };

216

235

if(new_server->ip == NULL){

217

236

perror_plus("strdup");

218

return -1;

237

return false;

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

219

243

}

220

244

/* Special case of first server */

221

if (mc.current_server == NULL){

245

if(*current_server == NULL){

222

246

new_server->next = new_server;

223

247

new_server->prev = new_server;

224

mc.current_server = new_server;

225

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

248

*current_server = new_server;

226

249

} else {

227

new_server->next = mc.current_server;

228

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

250

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

251

new_server->next = *current_server;

252

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

229

253

new_server->prev->next = new_server;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

254

(*current_server)->prev = new_server;

255

}

256

return true;

238

257

}

239

258

240

259

/*

241

260

* Initialize GPGME.

242

261

*/

243

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

244

const char *tempdir){

262

__attribute__((nonnull, warn_unused_result))

263

static bool init_gpgme(const char * const seckey,

264

const char * const pubkey,

265

const char * const tempdir,

266

mandos_context *mc){

245

267

gpgme_error_t rc;

246

268

gpgme_engine_info_t engine_info;

247

269

248

249

270

/*

250

271

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

251

272

*/

252

bool import_key(const char *filename){

273

bool import_key(const char * const filename){

253

274

int ret;

254

275

int fd;

255

276

gpgme_data_t pgp_data;

267

288

return false;

268

289

}

269

290

270

rc = gpgme_op_import(mc.ctx, pgp_data);

291

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

271

292

if(rc != GPG_ERR_NO_ERROR){

272

293

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

273

294

gpgme_strsource(rc), gpgme_strerror(rc));

317

338

}

318

339

319

340

/* Create new GPGME "context" */

320

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

341

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

321

342

if(rc != GPG_ERR_NO_ERROR){

322

343

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

323

344

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

336

357

* Decrypt OpenPGP data.

337

358

* Returns -1 on error

338

359

*/

360

__attribute__((nonnull, warn_unused_result))

339

361

static ssize_t pgp_packet_decrypt(const char *cryptotext,

340

362

size_t crypto_size,

341

char **plaintext){

363

char **plaintext,

364

mandos_context *mc){

342

365

gpgme_data_t dh_crypto, dh_plain;

343

366

gpgme_error_t rc;

344

367

ssize_t ret;

370

393

371

394

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

372

395

data buffer */

373

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

396

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

374

397

if(rc != GPG_ERR_NO_ERROR){

375

398

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

376

399

gpgme_strsource(rc), gpgme_strerror(rc));

377

400

plaintext_length = -1;

378

401

if(debug){

379

402

gpgme_decrypt_result_t result;

380

result = gpgme_op_decrypt_result(mc.ctx);

403

result = gpgme_op_decrypt_result(mc->ctx);

381

404

if(result == NULL){

382

405

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

383

406

} else {

460

483

return plaintext_length;

461

484

}

462

485

463

static const char * safer_gnutls_strerror(int value){

464

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

465

-Wunreachable-code */

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

const char *ret = gnutls_strerror(value);

466

489

if(ret == NULL)

467

490

ret = "(unknown)";

468

491

return ret;

469

492

}

470

493

471

494

/* GnuTLS log function callback */

495

__attribute__((nonnull))

472

496

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

473

497

const char* string){

474

498

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

475

499

}

476

500

501

__attribute__((nonnull, warn_unused_result))

477

502

static int init_gnutls_global(const char *pubkeyfilename,

478

const char *seckeyfilename){

503

const char *seckeyfilename,

504

mandos_context *mc){

479

505

int ret;

480

506

481

507

if(debug){

498

524

}

499

525

500

526

/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

502

528

if(ret != GNUTLS_E_SUCCESS){

503

529

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

504

530

safer_gnutls_strerror(ret));

514

540

}

515

541

516

542

ret = gnutls_certificate_set_openpgp_key_file

517

(mc.cred, pubkeyfilename, seckeyfilename,

543

(mc->cred, pubkeyfilename, seckeyfilename,

518

544

GNUTLS_OPENPGP_FMT_BASE64);

519

545

if(ret != GNUTLS_E_SUCCESS){

520

546

fprintf_plus(stderr,

526

552

}

527

553

528

554

/* GnuTLS server initialization */

529

ret = gnutls_dh_params_init(&mc.dh_params);

555

ret = gnutls_dh_params_init(&mc->dh_params);

530

556

if(ret != GNUTLS_E_SUCCESS){

531

557

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

558

" initialization: %s\n",

533

559

safer_gnutls_strerror(ret));

534

560

goto globalfail;

535

561

}

536

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

562

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

537

563

if(ret != GNUTLS_E_SUCCESS){

538

564

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

539

565

safer_gnutls_strerror(ret));

540

566

goto globalfail;

541

567

}

542

568

543

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

569

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

544

570

545

571

return 0;

546

572

547

573

globalfail:

548

574

549

gnutls_certificate_free_credentials(mc.cred);

575

gnutls_certificate_free_credentials(mc->cred);

550

576

gnutls_global_deinit();

551

gnutls_dh_params_deinit(mc.dh_params);

577

gnutls_dh_params_deinit(mc->dh_params);

552

578

return -1;

553

579

}

554

580

555

static int init_gnutls_session(gnutls_session_t *session){

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

556

584

int ret;

557

585

/* GnuTLS session creation */

558

586

do {

570

598

{

571

599

const char *err;

572

600

do {

573

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

601

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

574

602

if(quit_now){

575

603

gnutls_deinit(*session);

576

604

return -1;

587

615

588

616

do {

589

617

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

590

mc.cred);

618

mc->cred);

591

619

if(quit_now){

592

620

gnutls_deinit(*session);

593

621

return -1;

603

631

/* ignore client certificate if any. */

604

632

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

605

633

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

607

635

608

636

return 0;

609

637

}

613

641

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

614

642

615

643

/* Called when a Mandos server is found */

616

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

644

__attribute__((nonnull, warn_unused_result))

645

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

617

646

AvahiIfIndex if_index,

618

int af){

647

int af, mandos_context *mc){

619

648

int ret, tcp_sd = -1;

620

649

ssize_t sret;

621

union {

622

struct sockaddr_in in;

623

struct sockaddr_in6 in6;

624

} to;

650

struct sockaddr_storage to;

625

651

char *buffer = NULL;

626

652

char *decrypted_buffer = NULL;

627

653

size_t buffer_length = 0;

651

677

return -1;

652

678

}

653

679

654

ret = init_gnutls_session(&session);

680

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

681

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

682

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

683

bool match = false;

684

{

685

char *interface = NULL;

686

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

687

interface))){

688

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

689

match = true;

690

break;

691

}

692

}

693

}

694

if(not match){

695

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

696

connect to the server */

697

if(debug){

698

char interface[IF_NAMESIZE];

699

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

700

perror_plus("if_indextoname");

701

} else {

702

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

703

" \"%s\"\n",

704

if_indextoname((unsigned int)if_index,

705

interface));

706

}

707

}

708

return -1;

709

}

710

}

711

712

ret = init_gnutls_session(&session, mc);

655

713

if(ret != 0){

656

714

return -1;

657

715

}

658

716

659

717

if(debug){

660

718

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

661

PRIu16 "\n", ip, port);

719

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

662

720

}

663

721

664

722

tcp_sd = socket(pf, SOCK_STREAM, 0);

676

734

677

735

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

678

736

if(af == AF_INET6){

679

to.in6.sin6_family = (sa_family_t)af;

680

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

737

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

738

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

681

739

} else { /* IPv4 */

682

to.in.sin_family = (sa_family_t)af;

683

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

740

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

741

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

684

742

}

685

743

if(ret < 0 ){

686

744

int e = errno;

695

753

goto mandos_end;

696

754

}

697

755

if(af == AF_INET6){

698

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

699

-Wconversion and

700

-Wunreachable-code */

701

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

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

704

-Wunreachable-code*/

756

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

757

if(IN6_IS_ADDR_LINKLOCAL

758

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

705

759

if(if_index == AVAHI_IF_UNSPEC){

706

760

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

707

761

" incomplete without a network interface\n");

709

763

goto mandos_end;

710

764

}

711

765

/* Set the network interface number as scope */

712

to.in6.sin6_scope_id = (uint32_t)if_index;

766

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

713

767

}

714

768

} else {

715

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

716

-Wconversion and

717

-Wunreachable-code */

769

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

718

770

}

719

771

720

772

if(quit_now){

728

780

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

729

781

perror_plus("if_indextoname");

730

782

} else {

731

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

732

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

783

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

784

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

733

785

}

734

786

} else {

735

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

736

ip, port);

787

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

788

ip, (uintmax_t)port);

737

789

}

738

790

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

791

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

740

const char *pcret;

741

792

if(af == AF_INET6){

742

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

743

sizeof(addrstr));

793

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

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

744

797

} else {

745

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

746

sizeof(addrstr));

798

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

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

747

802

}

748

if(pcret == NULL){

749

perror_plus("inet_ntop");

750

} else {

751

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

752

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

753

}

803

if(ret == EAI_SYSTEM){

804

perror_plus("getnameinfo");

805

} else if(ret != 0) {

806

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

807

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

808

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

754

809

}

755

810

}

756

811

760

815

}

761

816

762

817

if(af == AF_INET6){

763

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

818

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

819

sizeof(struct sockaddr_in6));

764

820

} else {

765

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

821

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

822

sizeof(struct sockaddr_in));

766

823

}

767

824

if(ret < 0){

768

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

825

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

769

826

int e = errno;

770

827

perror_plus("connect");

771

828

errno = e;

817

874

goto mandos_end;

818

875

}

819

876

820

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

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

877

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

878

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

879

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

880

gnutls_transport_set_ptr(session,

881

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

822

882

823

883

if(quit_now){

824

884

errno = EINTR;

929

989

if(buffer_length > 0){

930

990

ssize_t decrypted_buffer_size;

931

991

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

932

&decrypted_buffer);

992

&decrypted_buffer, mc);

933

993

if(decrypted_buffer_size >= 0){

934

994

935

995

written = 0;

983

1043

return retval;

984

1044

}

985

1045

1046

__attribute__((nonnull))

986

1047

static void resolve_callback(AvahiSServiceResolver *r,

987

1048

AvahiIfIndex interface,

988

1049

AvahiProtocol proto,

996

1057

AVAHI_GCC_UNUSED AvahiStringList *txt,

997

1058

AVAHI_GCC_UNUSED AvahiLookupResultFlags

998

1059

flags,

999

AVAHI_GCC_UNUSED void* userdata){

1000

assert(r);

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

1001

1064

1002

1065

/* Called whenever a service has been resolved successfully or

1003

1066

timed out */

1012

1075

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

1013

1076

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

1014

1077

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

1078

avahi_strerror(avahi_server_errno

1079

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

1016

1080

break;

1017

1081

1018

1082

case AVAHI_RESOLVER_FOUND:

1024

1088

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

1025

1089

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

1026

1090

}

1027

int ret = start_mandos_communication(ip, port, interface,

1028

avahi_proto_to_af(proto));

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

1029

1095

if(ret == 0){

1030

avahi_simple_poll_quit(mc.simple_poll);

1096

avahi_simple_poll_quit(simple_poll);

1031

1097

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1098

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

1099

avahi_proto_to_af(proto),

1100

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

1101

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

1102

" list\n", name);

1103

}

1034

1104

}

1035

1105

}

1036

1106

}

1046

1116

const char *domain,

1047

1117

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1048

1118

flags,

1049

AVAHI_GCC_UNUSED void* userdata){

1050

assert(b);

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

1051

1123

1052

1124

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

1053

1125

is removed from the LAN */

1061

1133

case AVAHI_BROWSER_FAILURE:

1062

1134

1063

1135

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1065

avahi_simple_poll_quit(mc.simple_poll);

1136

avahi_strerror(avahi_server_errno

1137

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

1138

avahi_simple_poll_quit(simple_poll);

1066

1139

return;

1067

1140

1068

1141

case AVAHI_BROWSER_NEW:

1071

1144

the callback function is called the Avahi server will free the

1072

1145

resolver for us. */

1073

1146

1074

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

1075

name, type, domain, protocol, 0,

1076

resolve_callback, NULL) == NULL)

1147

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

1148

interface, protocol, name, type,

1149

domain, protocol, 0,

1150

resolve_callback, mc) == NULL)

1077

1151

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

1078

1152

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1153

avahi_strerror(avahi_server_errno

1154

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

1080

1155

break;

1081

1156

1082

1157

case AVAHI_BROWSER_REMOVE:

1101

1176

signal_received = sig;

1102

1177

int old_errno = errno;

1103

1178

/* set main loop to exit */

1104

if(mc.simple_poll != NULL){

1105

avahi_simple_poll_quit(mc.simple_poll);

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1106

1181

}

1107

1182

errno = old_errno;

1108

1183

}

1109

1184

1185

__attribute__((nonnull, warn_unused_result))

1110

1186

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

1111

1187

int ret;

1188

error_t ret_errno;

1112

1189

1113

1190

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

1114

1191

if(s < 0){

1192

ret_errno = errno;

1115

1193

perror_plus("socket");

1194

errno = ret_errno;

1116

1195

return false;

1117

1196

}

1118

1197

strcpy(ifr->ifr_name, ifname);

1119

1198

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

1199

if(ret == -1){

1121

1200

if(debug){

1201

ret_errno = errno;

1122

1202

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1123

1204

}

1124

1205

return false;

1125

1206

}

1126

1207

return true;

1127

1208

}

1128

1209

1210

__attribute__((nonnull, warn_unused_result))

1129

1211

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

1130

1212

1131

1213

/* Reject the loopback device */

1173

1255

* corresponds to an acceptable network device.

1174

1256

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

1175

1257

*/

1258

__attribute__((nonnull, warn_unused_result))

1176

1259

int good_interface(const struct dirent *if_entry){

1177

1260

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

1178

1261

return 0;

1194

1277

}

1195

1278

1196

1279

/*

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;

1237

}

1238

1280

* This function determines if a network interface is up.

1281

*/

1282

__attribute__((nonnull, warn_unused_result))

1283

bool interface_is_up(const char *interface){

1284

struct ifreq ifr;

1285

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

1286

if(debug){

1287

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

1288

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

1289

}

1290

return false;

1291

}

1292

1293

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

1294

}

1295

1296

/*

1297

* This function determines if a network interface is running

1298

*/

1299

__attribute__((nonnull, warn_unused_result))

1300

bool interface_is_running(const char *interface){

1301

struct ifreq ifr;

1302

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

1303

if(debug){

1304

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

1305

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

1306

}

1307

return false;

1308

}

1309

1310

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

1311

}

1312

1313

__attribute__((nonnull, pure, warn_unused_result))

1239

1314

int notdotentries(const struct dirent *direntry){

1240

1315

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

1241

1316

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

1248

1323

}

1249

1324

1250

1325

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

1326

__attribute__((nonnull, warn_unused_result))

1251

1327

int runnable_hook(const struct dirent *direntry){

1252

1328

int ret;

1253

1329

size_t sret;

1261

1337

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1262

1338

"abcdefghijklmnopqrstuvwxyz"

1263

1339

"0123456789"

1264

"_-");

1340

"_.-");

1265

1341

if((direntry->d_name)[sret] != '\0'){

1266

1342

/* Contains non-allowed characters */

1267

1343

if(debug){

1271

1347

return 0;

1272

1348

}

1273

1349

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1350

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1282

1351

if(ret == -1){

1283

1352

if(debug){

1284

1353

perror_plus("Could not stat hook");

1301

1370

}

1302

1371

return 0;

1303

1372

}

1373

if(debug){

1374

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

1375

direntry->d_name);

1376

}

1304

1377

return 1;

1305

1378

}

1306

1379

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1308

1383

int ret;

1309

1384

struct timespec now;

1310

1385

struct timespec waited_time;

1311

1386

intmax_t block_time;

1312

1387

1313

1388

while(true){

1314

if(mc.current_server == NULL){

1315

if (debug){

1389

if(mc->current_server == NULL){

1390

if(debug){

1316

1391

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

1317

1392

" No timeout!\n");

1318

1393

}

1319

1394

ret = avahi_simple_poll_iterate(s, -1);

1320

1395

} else {

1321

if (debug){

1396

if(debug){

1322

1397

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

1323

1398

" it, or wait\n");

1324

1399

}

1331

1406

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

1332

1407

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

1333

1408

waited_time.tv_sec = (now.tv_sec

1334

- mc.current_server->last_seen.tv_sec);

1409

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

1335

1410

waited_time.tv_nsec = (now.tv_nsec

1336

- mc.current_server->last_seen.tv_nsec);

1411

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

1337

1412

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

1338

1413

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

1339

1414

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

1341

1416

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

1342

1417

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

1343

1418

1344

if (debug){

1419

if(debug){

1345

1420

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

1346

1421

block_time);

1347

1422

}

1348

1423

1349

1424

if(block_time <= 0){

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);

1425

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

1426

mc->current_server->port,

1427

mc->current_server->if_index,

1428

mc->current_server->af, mc);

1354

1429

if(ret == 0){

1355

avahi_simple_poll_quit(mc.simple_poll);

1430

avahi_simple_poll_quit(s);

1356

1431

return 0;

1357

1432

}

1358

1433

ret = clock_gettime(CLOCK_MONOTONIC,

1359

&mc.current_server->last_seen);

1434

&mc->current_server->last_seen);

1360

1435

if(ret == -1){

1361

1436

perror_plus("clock_gettime");

1362

1437

return -1;

1363

1438

}

1364

mc.current_server = mc.current_server->next;

1439

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

1365

1440

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

1366

1441

servers, but don't block */

1367

1442

}

1369

1444

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

1370

1445

}

1371

1446

if(ret != 0){

1372

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

1447

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

1373

1448

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

1374

1449

}

1375

1450

}

1376

1451

}

1377

1452

}

1378

1453

1379

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

1454

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

1455

__attribute__((warn_unused_result))

1456

error_t raise_privileges(void){

1457

error_t old_errno = errno;

1458

error_t ret_errno = 0;

1459

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

1460

ret_errno = errno;

1461

}

1462

errno = old_errno;

1463

return ret_errno;

1464

}

1465

1466

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

1467

__attribute__((warn_unused_result))

1468

error_t raise_privileges_permanently(void){

1469

error_t old_errno = errno;

1470

error_t ret_errno = raise_privileges();

1471

if(ret_errno != 0){

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

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

1476

ret_errno = errno;

1477

}

1478

errno = old_errno;

1479

return ret_errno;

1480

}

1481

1482

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

1483

__attribute__((warn_unused_result))

1484

error_t lower_privileges(void){

1485

error_t old_errno = errno;

1486

error_t ret_errno = 0;

1487

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

1488

ret_errno = errno;

1489

}

1490

errno = old_errno;

1491

return ret_errno;

1492

}

1493

1494

/* Lower privileges permanently */

1495

__attribute__((warn_unused_result))

1496

error_t lower_privileges_permanently(void){

1497

error_t old_errno = errno;

1498

error_t ret_errno = 0;

1499

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

1500

ret_errno = errno;

1501

}

1502

errno = old_errno;

1503

return ret_errno;

1504

}

1505

1506

__attribute__((nonnull))

1507

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

1380

1508

const float delay){

1381

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

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

1385

alphasort);

1509

struct dirent **direntries = NULL;

1510

if(hookdir_fd == -1){

1511

hookdir_fd = open(hookdir, O_RDONLY);

1512

if(hookdir_fd == -1){

1513

if(errno == ENOENT){

1514

if(debug){

1515

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

1516

" found\n", hookdir);

1517

}

1518

} else {

1519

perror_plus("open");

1520

}

1521

return;

1522

}

1523

}

1524

#ifdef __GLIBC__

1525

#if __GLIBC_PREREQ(2, 15)

1526

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1527

runnable_hook, alphasort);

1528

#else /* not __GLIBC_PREREQ(2, 15) */

1529

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

1530

alphasort);

1531

#endif /* not __GLIBC_PREREQ(2, 15) */

1532

#else /* not __GLIBC__ */

1533

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

1534

alphasort);

1535

#endif /* not __GLIBC__ */

1386

1536

if(numhooks == -1){

1387

1537

perror_plus("scandir");

1388

} else {

1389

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

1390

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

1391

direntry = direntries[0];

1392

char *fullname = NULL;

1393

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

1394

if(ret < 0){

1538

return;

1539

}

1540

struct dirent *direntry;

1541

int ret;

1542

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

1543

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

1544

direntry = direntries[i];

1545

if(debug){

1546

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

1547

direntry->d_name);

1548

}

1549

pid_t hook_pid = fork();

1550

if(hook_pid == 0){

1551

/* Child */

1552

/* Raise privileges */

1553

errno = raise_privileges_permanently();

1554

if(errno != 0){

1555

perror_plus("Failed to raise privileges");

1556

_exit(EX_NOPERM);

1557

}

1558

/* Set group */

1559

errno = 0;

1560

ret = setgid(0);

1561

if(ret == -1){

1562

perror_plus("setgid");

1563

_exit(EX_NOPERM);

1564

}

1565

/* Reset supplementary groups */

1566

errno = 0;

1567

ret = setgroups(0, NULL);

1568

if(ret == -1){

1569

perror_plus("setgroups");

1570

_exit(EX_NOPERM);

1571

}

1572

ret = dup2(devnull, STDIN_FILENO);

1573

if(ret == -1){

1574

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

1575

_exit(EX_OSERR);

1576

}

1577

ret = close(devnull);

1578

if(ret == -1){

1579

perror_plus("close");

1580

_exit(EX_OSERR);

1581

}

1582

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1583

if(ret == -1){

1584

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

1585

_exit(EX_OSERR);

1586

}

1587

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

1588

if(ret == -1){

1589

perror_plus("setenv");

1590

_exit(EX_OSERR);

1591

}

1592

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

1593

if(ret == -1){

1594

perror_plus("setenv");

1595

_exit(EX_OSERR);

1596

}

1597

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

1598

if(ret == -1){

1599

perror_plus("setenv");

1600

_exit(EX_OSERR);

1601

}

1602

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

1603

if(ret == -1){

1604

perror_plus("setenv");

1605

_exit(EX_OSERR);

1606

}

1607

char *delaystring;

1608

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

1609

if(ret == -1){

1395

1610

perror_plus("asprintf");

1396

continue;

1611

_exit(EX_OSERR);

1397

1612

}

1398

pid_t hook_pid = fork();

1399

if(hook_pid == 0){

1400

/* Child */

1401

dup2(devnull, STDIN_FILENO);

1402

close(devnull);

1403

dup2(STDERR_FILENO, STDOUT_FILENO);

1404

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

1405

if(ret == -1){

1406

perror_plus("setenv");

1407

return false;

1408

}

1409

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

1410

if(ret == -1){

1411

perror_plus("setenv");

1412

return false;

1413

}

1414

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

1415

if(ret == -1){

1416

perror_plus("setenv");

1417

return false;

1418

}

1419

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

1420

if(ret == -1){

1421

perror_plus("setenv");

1422

return false;

1423

}

1424

char *delaystring;

1425

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

1426

if(ret == -1){

1427

perror_plus("asprintf");

1428

return false;

1429

}

1430

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

1431

if(ret == -1){

1432

free(delaystring);

1433

perror_plus("setenv");

1434

return false;

1435

}

1613

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

1614

if(ret == -1){

1436

1615

free(delaystring);

1437

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

1438

perror_plus("execl");

1439

} else {

1440

int status;

1441

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

1442

perror_plus("waitpid");

1443

free(fullname);

1444

continue;

1445

}

1446

if(WIFEXITED(status)){

1447

if(WEXITSTATUS(status) != 0){

1448

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1449

" with status %d\n", direntry->d_name,

1450

WEXITSTATUS(status));

1451

free(fullname);

1452

continue;

1453

}

1454

} else if(WIFSIGNALED(status)){

1455

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1456

" signal %d\n", direntry->d_name,

1457

WTERMSIG(status));

1458

free(fullname);

1459

continue;

1460

} else {

1461

fprintf_plus(stderr, "Warning: network hook \"%s\""

1462

" crashed\n", direntry->d_name);

1463

free(fullname);

1464

continue;

1465

}

1466

}

1467

free(fullname);

1468

if(quit_now){

1469

break;

1470

}

1471

}

1472

close(devnull);

1473

}

1474

return true;

1616

perror_plus("setenv");

1617

_exit(EX_OSERR);

1618

}

1619

free(delaystring);

1620

if(connect_to != NULL){

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

_exit(EX_OSERR);

1625

}

1626

}

1627

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1628

if(hook_fd == -1){

1629

perror_plus("openat");

1630

_exit(EXIT_FAILURE);

1631

}

1632

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1633

perror_plus("close");

1634

_exit(EXIT_FAILURE);

1635

}

1636

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

1637

environ) == -1){

1638

perror_plus("fexecve");

1639

_exit(EXIT_FAILURE);

1640

}

1641

} else {

1642

int status;

1643

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

1644

perror_plus("waitpid");

1645

continue;

1646

}

1647

if(WIFEXITED(status)){

1648

if(WEXITSTATUS(status) != 0){

1649

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1650

" with status %d\n", direntry->d_name,

1651

WEXITSTATUS(status));

1652

continue;

1653

}

1654

} else if(WIFSIGNALED(status)){

1655

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1656

" signal %d\n", direntry->d_name,

1657

WTERMSIG(status));

1658

continue;

1659

} else {

1660

fprintf_plus(stderr, "Warning: network hook \"%s\""

1661

" crashed\n", direntry->d_name);

1662

continue;

1663

}

1664

}

1665

if(debug){

1666

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

1667

direntry->d_name);

1668

}

1669

}

1670

free(direntries);

1671

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1672

perror_plus("close");

1673

} else {

1674

hookdir_fd = -1;

1675

}

1676

close(devnull);

1677

}

1678

1679

__attribute__((nonnull, warn_unused_result))

1680

error_t bring_up_interface(const char *const interface,

1681

const float delay){

1682

error_t old_errno = errno;

1683

int ret;

1684

struct ifreq network;

1685

unsigned int if_index = if_nametoindex(interface);

1686

if(if_index == 0){

1687

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

1688

errno = old_errno;

1689

return ENXIO;

1690

}

1691

1692

if(quit_now){

1693

errno = old_errno;

1694

return EINTR;

1695

}

1696

1697

if(not interface_is_up(interface)){

1698

error_t ret_errno = 0, ioctl_errno = 0;

1699

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

1700

ret_errno = errno;

1701

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

1702

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

1703

errno = old_errno;

1704

return ret_errno;

1705

}

1706

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

1707

1708

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

1709

if(sd == -1){

1710

ret_errno = errno;

1711

perror_plus("socket");

1712

errno = old_errno;

1713

return ret_errno;

1714

}

1715

1716

if(quit_now){

1717

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

1718

if(ret == -1){

1719

perror_plus("close");

1720

}

1721

errno = old_errno;

1722

return EINTR;

1723

}

1724

1725

if(debug){

1726

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

1727

interface);

1728

}

1729

1730

/* Raise privileges */

1731

ret_errno = raise_privileges();

1732

if(ret_errno != 0){

1733

errno = ret_errno;

1734

perror_plus("Failed to raise privileges");

1735

}

1736

1737

#ifdef __linux__

1738

int ret_linux;

1739

bool restore_loglevel = false;

1740

if(ret_errno == 0){

1741

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1742

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

1743

ret_linux = klogctl(8, NULL, 5);

1744

if(ret_linux == -1){

1745

perror_plus("klogctl");

1746

} else {

1747

restore_loglevel = true;

1748

}

1749

}

1750

#endif /* __linux__ */

1751

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

1752

ioctl_errno = errno;

1753

#ifdef __linux__

1754

if(restore_loglevel){

1755

ret_linux = klogctl(7, NULL, 0);

1756

if(ret_linux == -1){

1757

perror_plus("klogctl");

1758

}

1759

}

1760

#endif /* __linux__ */

1761

1762

/* If raise_privileges() succeeded above */

1763

if(ret_errno == 0){

1764

/* Lower privileges */

1765

ret_errno = lower_privileges();

1766

if(ret_errno != 0){

1767

errno = ret_errno;

1768

perror_plus("Failed to lower privileges");

1769

}

1770

}

1771

1772

/* Close the socket */

1773

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

1774

if(ret == -1){

1775

perror_plus("close");

1776

}

1777

1778

if(ret_setflags == -1){

1779

errno = ioctl_errno;

1780

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1781

errno = old_errno;

1782

return ioctl_errno;

1783

}

1784

} else if(debug){

1785

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

1786

interface);

1787

}

1788

1789

/* Sleep checking until interface is running.

1790

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

1791

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

1792

if(interface_is_running(interface)){

1793

break;

1794

}

1795

struct timespec sleeptime = { .tv_nsec = 250000000 };

1796

ret = nanosleep(&sleeptime, NULL);

1797

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

1798

perror_plus("nanosleep");

1799

}

1800

}

1801

1802

errno = old_errno;

1803

return 0;

1804

}

1805

1806

__attribute__((nonnull, warn_unused_result))

1807

error_t take_down_interface(const char *const interface){

1808

error_t old_errno = errno;

1809

struct ifreq network;

1810

unsigned int if_index = if_nametoindex(interface);

1811

if(if_index == 0){

1812

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

1813

errno = old_errno;

1814

return ENXIO;

1815

}

1816

if(interface_is_up(interface)){

1817

error_t ret_errno = 0, ioctl_errno = 0;

1818

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

1819

ret_errno = errno;

1820

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

1821

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

1822

errno = old_errno;

1823

return ret_errno;

1824

}

1825

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

1826

1827

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

1828

if(sd == -1){

1829

ret_errno = errno;

1830

perror_plus("socket");

1831

errno = old_errno;

1832

return ret_errno;

1833

}

1834

1835

if(debug){

1836

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

1837

interface);

1838

}

1839

1840

/* Raise privileges */

1841

ret_errno = raise_privileges();

1842

if(ret_errno != 0){

1843

errno = ret_errno;

1844

perror_plus("Failed to raise privileges");

1845

}

1846

1847

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

1848

ioctl_errno = errno;

1849

1850

/* If raise_privileges() succeeded above */

1851

if(ret_errno == 0){

1852

/* Lower privileges */

1853

ret_errno = lower_privileges();

1854

if(ret_errno != 0){

1855

errno = ret_errno;

1856

perror_plus("Failed to lower privileges");

1857

}

1858

}

1859

1860

/* Close the socket */

1861

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

1862

if(ret == -1){

1863

perror_plus("close");

1864

}

1865

1866

if(ret_setflags == -1){

1867

errno = ioctl_errno;

1868

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1869

errno = old_errno;

1870

return ioctl_errno;

1871

}

1872

} else if(debug){

1873

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

1874

interface);

1875

}

1876

1877

errno = old_errno;

1878

return 0;

1475

1879

}

1476

1880

1477

1881

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

1882

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

1883

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

1884

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

1885

.interfaces = NULL, .interfaces_size = 0 };

1478

1886

AvahiSServiceBrowser *sb = NULL;

1479

int error;

1887

error_t ret_errno;

1480

1888

int ret;

1481

1889

intmax_t tmpmax;

1482

1890

char *tmp;

1483

1891

int exitcode = EXIT_SUCCESS;

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;

1490

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

1491

bool tempdir_created = false;

1892

char *interfaces_to_take_down = NULL;

1893

size_t interfaces_to_take_down_size = 0;

1894

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

1895

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

1896

char *tempdir = NULL;

1492

1897

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1493

1898

const char *seckey = PATHDIR "/" SECKEY;

1494

1899

const char *pubkey = PATHDIR "/" PUBKEY;

1900

char *interfaces_hooks = NULL;

1495

1901

1496

1902

bool gnutls_initialized = false;

1497

1903

bool gpgme_initialized = false;

1559

1965

.group = 2 },

1560

1966

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

1561

1967

.arg = "SECONDS",

1562

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

1968

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

1563

1969

.group = 2 },

1564

1970

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

1565

1971

.arg = "DIR",

1588

1994

connect_to = arg;

1589

1995

break;

1590

1996

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

1591

interface = arg;

1997

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

1998

arg, (int)',');

1999

if(ret_errno != 0){

2000

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

2001

}

1592

2002

break;

1593

2003

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

1594

2004

seckey = arg;

1637

2047

argp_state_help(state, state->out_stream,

1638

2048

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1639

2049

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

1642

2050

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

1643

2051

exit(argp_err_exit_status);

1644

2052

break;

1672

2080

{

1673

2081

/* Work around Debian bug #633582:

1674

2082

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

1675

struct stat st;

1676

1677

/* Re-raise priviliges */

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");

2083

2084

/* Re-raise privileges */

2085

ret_errno = raise_privileges();

2086

if(ret_errno != 0){

2087

errno = ret_errno;

2088

perror_plus("Failed to raise privileges");

2089

} else {

2090

struct stat st;

2091

2092

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

2093

int seckey_fd = open(seckey, O_RDONLY);

2094

if(seckey_fd == -1){

2095

perror_plus("open");

2096

} else {

2097

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

2098

if(ret == -1){

2099

perror_plus("fstat");

2100

} else {

2101

if(S_ISREG(st.st_mode)

2102

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

2103

ret = fchown(seckey_fd, uid, gid);

2104

if(ret == -1){

2105

perror_plus("fchown");

2106

}

2107

}

2108

}

2109

TEMP_FAILURE_RETRY(close(seckey_fd));

2110

}

2111

}

2112

2113

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

2114

int pubkey_fd = open(pubkey, O_RDONLY);

2115

if(pubkey_fd == -1){

2116

perror_plus("open");

2117

} else {

2118

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

2119

if(ret == -1){

2120

perror_plus("fstat");

2121

} else {

2122

if(S_ISREG(st.st_mode)

2123

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

2124

ret = fchown(pubkey_fd, uid, gid);

2125

if(ret == -1){

2126

perror_plus("fchown");

2127

}

2128

}

2129

}

2130

TEMP_FAILURE_RETRY(close(pubkey_fd));

2131

}

2132

}

2133

2134

/* Lower privileges */

2135

ret_errno = lower_privileges();

2136

if(ret_errno != 0){

2137

errno = ret_errno;

2138

perror_plus("Failed to lower privileges");

2139

}

2140

}

2141

}

2142

2143

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

2144

{

2145

char *interface = NULL;

2146

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

2147

interface))){

2148

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

2149

and if_nametoindex(interface) == 0){

2150

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

2151

fprintf_plus(stderr, "Not using nonexisting interface"

2152

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

2153

}

2154

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

2155

interface = NULL;

2156

}

1731

2157

}

1732

2158

}

1733

2159

1734

2160

/* Run network hooks */

1735

2161

{

1736

/* Re-raise priviliges */

1737

errno = 0;

1738

ret = seteuid(0);

1739

if(ret == -1){

1740

perror_plus("seteuid");

1741

}

1742

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

1743

goto end;

1744

}

1745

/* Lower privileges */

1746

errno = 0;

1747

ret = seteuid(uid);

1748

if(ret == -1){

1749

perror_plus("seteuid");

1750

}

2162

if(mc.interfaces != NULL){

2163

interfaces_hooks = malloc(mc.interfaces_size);

2164

if(interfaces_hooks == NULL){

2165

perror_plus("malloc");

2166

goto end;

2167

}

2168

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

2169

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

2170

}

2171

run_network_hooks("start", interfaces_hooks != NULL ?

2172

interfaces_hooks : "", delay);

1751

2173

}

1752

2174

1753

2175

if(not debug){

1754

2176

avahi_set_log_function(empty_log);

1755

2177

}

1756

2178

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

1789

2179

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

1790

2180

from the signal handler */

1791

2181

/* Initialize the pseudo-RNG for Avahi */

1792

2182

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

1793

mc.simple_poll = avahi_simple_poll_new();

1794

if(mc.simple_poll == NULL){

2183

simple_poll = avahi_simple_poll_new();

2184

if(simple_poll == NULL){

1795

2185

fprintf_plus(stderr,

1796

2186

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

1797

2187

exitcode = EX_UNAVAILABLE;

1861

2251

}

1862

2252

}

1863

2253

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");

2254

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

2255

if(mc.interfaces == NULL){

2256

struct dirent **direntries = NULL;

2257

/* Look for any good interfaces */

2258

ret = scandir(sys_class_net, &direntries, good_interface,

2259

alphasort);

2260

if(ret >= 1){

2261

/* Add all found interfaces to interfaces list */

2262

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

2263

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

2264

direntries[i]->d_name);

2265

if(ret_errno != 0){

2266

errno = ret_errno;

2267

perror_plus("argz_add");

2268

continue;

2269

}

2270

if(debug){

2271

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

2272

direntries[i]->d_name);

2273

}

2274

}

2275

free(direntries);

2276

} else {

2277

if(ret == 0){

2278

free(direntries);

2279

}

2280

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

2281

exitcode = EXIT_FAILURE;

2282

goto end;

2283

}

2284

}

2285

2286

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

2287

{

2288

char *interface = NULL;

2289

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

2290

interface))){

2291

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

2292

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

2293

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

2294

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

2295

interface);

2296

interface = NULL;

2297

while((interface = argz_next(mc.interfaces,

2298

mc.interfaces_size, interface))){

2299

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

2300

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

2301

interface);

2302

interface = NULL;

1949

2303

}

1950

2304

}

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

2305

break;

1969

2306

}

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");

1998

}

2307

bool interface_was_up = interface_is_up(interface);

2308

errno = bring_up_interface(interface, delay);

2309

if(not interface_was_up){

2310

if(errno != 0){

2311

perror_plus("Failed to bring up interface");

2312

} else {

2313

errno = argz_add(&interfaces_to_take_down,

2314

&interfaces_to_take_down_size,

2315

interface);

2316

if(errno != 0){

2317

perror_plus("argz_add");

2318

}

2319

}

2320

}

2321

}

2322

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

2323

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

2324

}

2325

}

2326

2327

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

2328

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

2329

if(debug){

2330

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

2331

mc.interfaces);

2332

}

2333

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

1999

2334

}

2000

2335

2001

2336

if(quit_now){

2002

2337

goto end;

2003

2338

}

2004

2339

2005

ret = init_gnutls_global(pubkey, seckey);

2340

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

2006

2341

if(ret == -1){

2007

2342

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

2008

2343

exitcode = EX_UNAVAILABLE;

2015

2350

goto end;

2016

2351

}

2017

2352

2018

if(mkdtemp(tempdir) == NULL){

2353

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

2354

tempdir = mkdtemp(run_tempdir);

2355

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

2356

if(debug){

2357

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

2358

run_tempdir, old_tempdir);

2359

}

2360

tempdir = mkdtemp(old_tempdir);

2361

}

2362

if(tempdir == NULL){

2019

2363

perror_plus("mkdtemp");

2020

2364

goto end;

2021

2365

}

2022

tempdir_created = true;

2023

2366

2024

2367

if(quit_now){

2025

2368

goto end;

2026

2369

}

2027

2370

2028

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

2371

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

2029

2372

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

2030

2373

exitcode = EX_UNAVAILABLE;

2031

2374

goto end;

2041

2384

/* Connect directly, do not use Zeroconf */

2042

2385

/* (Mainly meant for debugging) */

2043

2386

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

2387

2044

2388

if(address == NULL){

2045

2389

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

2046

2390

exitcode = EX_USAGE;

2051

2395

goto end;

2052

2396

}

2053

2397

2054

uint16_t port;

2398

in_port_t port;

2055

2399

errno = 0;

2056

2400

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

2057

2401

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

2058

or tmpmax != (uint16_t)tmpmax){

2402

or tmpmax != (in_port_t)tmpmax){

2059

2403

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

2060

2404

exitcode = EX_USAGE;

2061

2405

goto end;

2062

2406

}

2063

2407

2064

2408

if(quit_now){

2065

2409

goto end;

2066

2410

}

2067

2411

2068

port = (uint16_t)tmpmax;

2412

port = (in_port_t)tmpmax;

2069

2413

*address = '\0';

2070

2414

/* Colon in address indicates IPv6 */

2071

2415

int af;

2087

2431

}

2088

2432

2089

2433

while(not quit_now){

2090

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

2434

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

2435

&mc);

2091

2436

if(quit_now or ret == 0){

2092

2437

break;

2093

2438

}

2095

2440

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

2096

2441

(int)retry_interval);

2097

2442

}

2098

sleep((int)retry_interval);

2443

sleep((unsigned int)retry_interval);

2099

2444

}

2100

2445

2101

if (not quit_now){

2446

if(not quit_now){

2102

2447

exitcode = EXIT_SUCCESS;

2103

2448

}

2104

2449

2119

2464

config.publish_domain = 0;

2120

2465

2121

2466

/* Allocate a new server */

2122

mc.server = avahi_server_new(avahi_simple_poll_get

2123

(mc.simple_poll), &config, NULL,

2124

NULL, &error);

2467

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2468

&config, NULL, NULL, &ret_errno);

2125

2469

2126

2470

/* Free the Avahi configuration data */

2127

2471

avahi_server_config_free(&config);

2130

2474

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

2131

2475

if(mc.server == NULL){

2132

2476

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

2133

avahi_strerror(error));

2477

avahi_strerror(ret_errno));

2134

2478

exitcode = EX_UNAVAILABLE;

2135

2479

goto end;

2136

2480

}

2142

2486

/* Create the Avahi service browser */

2143

2487

sb = avahi_s_service_browser_new(mc.server, if_index,

2144

2488

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2145

NULL, 0, browse_callback, NULL);

2489

NULL, 0, browse_callback,

2490

(void *)&mc);

2146

2491

if(sb == NULL){

2147

2492

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

2148

2493

avahi_strerror(avahi_server_errno(mc.server)));

2159

2504

if(debug){

2160

2505

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

2161

2506

}

2162

2163

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

(int)(retry_interval * 1000));

2507

2508

ret = avahi_loop_with_timeout(simple_poll,

2509

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

2165

2510

if(debug){

2166

2511

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

2167

2512

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

2174

2519

}

2175

2520

2176

2521

/* Cleanup things */

2522

free(mc.interfaces);

2523

2177

2524

if(sb != NULL)

2178

2525

avahi_s_service_browser_free(sb);

2179

2526

2180

2527

if(mc.server != NULL)

2181

2528

avahi_server_free(mc.server);

2182

2529

2183

if(mc.simple_poll != NULL)

2184

avahi_simple_poll_free(mc.simple_poll);

2530

if(simple_poll != NULL)

2531

avahi_simple_poll_free(simple_poll);

2185

2532

2186

2533

if(gnutls_initialized){

2187

2534

gnutls_certificate_free_credentials(mc.cred);

2192

2539

if(gpgme_initialized){

2193

2540

gpgme_release(mc.ctx);

2194

2541

}

2195

2542

2196

2543

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

2197

2544

has seen */

2198

2545

if(mc.current_server != NULL){

2204

2551

}

2205

2552

}

2206

2553

2207

/* Re-raise priviliges */

2554

/* Re-raise privileges */

2208

2555

{

2209

errno = 0;

2210

ret = seteuid(0);

2211

if(ret == -1){

2212

perror_plus("seteuid");

2213

}

2214

/* Run network hooks */

2215

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

2216

goto end;

2556

ret_errno = raise_privileges();

2557

if(ret_errno != 0){

2558

errno = ret_errno;

2559

perror_plus("Failed to raise privileges");

2560

} else {

2561

2562

/* Run network hooks */

2563

run_network_hooks("stop", interfaces_hooks != NULL ?

2564

interfaces_hooks : "", delay);

2565

2566

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

2567

{

2568

char *interface = NULL;

2569

while((interface=argz_next(interfaces_to_take_down,

2570

interfaces_to_take_down_size,

2571

interface))){

2572

ret_errno = take_down_interface(interface);

2573

if(ret_errno != 0){

2574

errno = ret_errno;

2575

perror_plus("Failed to take down interface");

2576

}

2577

}

2578

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

2579

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

2580

" down\n");

2581

}

2582

}

2217

2583

}

2218

2584

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");

2229

}

2230

}

2231

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

2232

if(ret == -1){

2233

perror_plus("close");

2234

}

2585

ret_errno = lower_privileges_permanently();

2586

if(ret_errno != 0){

2587

errno = ret_errno;

2588

perror_plus("Failed to lower privileges permanently");

2235

2589

}

2236

2590

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2591

2592

free(interfaces_to_take_down);

2593

free(interfaces_hooks);

2243

2594

2244

2595

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

2245

if(tempdir_created){

2596

if(tempdir != NULL){

2246

2597

struct dirent **direntries = NULL;

2247

struct dirent *direntry = NULL;

2248

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

2249

alphasort);

2250

if (numentries > 0){

2251

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

2252

direntry = direntries[i];

2253

char *fullname = NULL;

2254

ret = asprintf(&fullname, "%s/%s", tempdir,

2255

direntry->d_name);

2256

if(ret < 0){

2257

perror_plus("asprintf");

2258

continue;

2259

}

2260

ret = remove(fullname);

2261

if(ret == -1){

2262

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,

2263

strerror(errno));

2264

}

2265

free(fullname);

2598

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |

2599

O_NOFOLLOW));

2600

if(tempdir_fd == -1){

2601

perror_plus("open");

2602

} else {

2603

#ifdef __GLIBC__

2604

#if __GLIBC_PREREQ(2, 15)

2605

int numentries = scandirat(tempdir_fd, ".", &direntries,

2606

notdotentries, alphasort);

2607

#else /* not __GLIBC_PREREQ(2, 15) */

2608

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

2609

alphasort);

2610

#endif /* not __GLIBC_PREREQ(2, 15) */

2611

#else /* not __GLIBC__ */

2612

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

2613

alphasort);

2614

#endif /* not __GLIBC__ */

2615

if(numentries >= 0){

2616

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

2617

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2618

if(ret == -1){

2619

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2620

" \"%s\", 0): %s\n", tempdir,

2621

direntries[i]->d_name, strerror(errno));

2622

}

2623

}

2624

2625

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

2626

free(direntries);

2627

if(numentries == -1){

2628

perror_plus("scandir");

2629

}

2630

ret = rmdir(tempdir);

2631

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

2632

perror_plus("rmdir");

2633

}

2266

2634

}

2267

}

2268

2269

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

2270

free(direntries);

2271

if (numentries == -1){

2272

perror_plus("scandir");

2273

}

2274

ret = rmdir(tempdir);

2275

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

2276

perror_plus("rmdir");

2635

TEMP_FAILURE_RETRY(close(tempdir_fd));

2277

2636

}

2278

2637

}

2279

2638