/mandos/release : revision 237.16.10

9

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

10

*

11

* Everything else is

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13

12

13

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*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

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42

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

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stdout, ferror() */

44

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

43

stdout, ferror(), remove() */

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 */

57

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

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inet_pton(), connect(),

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getnameinfo() */

60

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

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inet_pton(), connect() */

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

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60

#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() */

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

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program_invocation_short_name */

67

#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(), _exit(),

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unlinkat() */

78

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

76

setgid(), pause() */

77

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

79

78

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

80

79

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

81

80

argp_state, struct argp,

88

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

89

88

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

90

89

WEXITSTATUS(), WTERMSIG() */

91

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

92

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

93

argz_delete(), argz_append(),

94

argz_stringify(), argz_add(),

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

98

90

99

91

#ifdef __linux__

100

92

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

142

134

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

143

135

char *connect_to = NULL;

144

136

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

148

137

149

138

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

150

139

typedef struct server{

151

140

const char *ip;

152

in_port_t port;

141

uint16_t port;

153

142

AvahiIfIndex if_index;

154

143

int af;

155

144

struct timespec last_seen;

159

148

160

149

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

161

150

typedef struct {

151

AvahiSimplePoll *simple_poll;

162

152

AvahiServer *server;

163

153

gnutls_certificate_credentials_t cred;

164

154

unsigned int dh_bits;

166

156

const char *priority;

167

157

gpgme_ctx_t ctx;

168

158

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

159

} mandos_context;

172

160

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

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 };

175

166

176

167

sig_atomic_t quit_now = 0;

177

168

int signal_received = 0;

178

169

179

170

/* Function to use when printing errors */

180

171

void perror_plus(const char *print_text){

181

int e = errno;

182

172

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

183

173

program_invocation_short_name);

184

errno = e;

185

174

perror(print_text);

186

175

}

187

176

188

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

189

177

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

190

178

va_list ap;

191

179

va_start (ap, format);

192

180

193

181

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

194

182

program_invocation_short_name));

195

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

183

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

196

184

}

197

185

198

186

/*

200

188

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

201

189

* "buffer_length" is how much is already used.

202

190

*/

203

__attribute__((nonnull, warn_unused_result))

204

191

size_t incbuffer(char **buffer, size_t buffer_length,

205

192

size_t buffer_capacity){

206

193

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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;

194

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

195

if(buffer == NULL){

213

196

return 0;

214

197

}

215

*buffer = new_buf;

216

198

buffer_capacity += BUFFER_SIZE;

217

199

}

218

200

return buffer_capacity;

219

201

}

220

202

221

203

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

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){

204

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

205

int af){

225

206

int ret;

226

207

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

227

208

if(new_server == NULL){

228

209

perror_plus("malloc");

229

return false;

210

return -1;

230

211

}

231

212

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

232

213

.port = port,

234

215

.af = af };

235

216

if(new_server->ip == NULL){

236

217

perror_plus("strdup");

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;

218

return -1;

243

219

}

244

220

/* Special case of first server */

245

if(*current_server == NULL){

221

if (mc.current_server == NULL){

246

222

new_server->next = new_server;

247

223

new_server->prev = new_server;

248

*current_server = new_server;

224

mc.current_server = new_server;

225

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

249

226

} else {

250

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

251

new_server->next = *current_server;

252

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

227

new_server->next = mc.current_server;

228

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

253

229

new_server->prev->next = new_server;

254

(*current_server)->prev = new_server;

255

}

256

return true;

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;

257

238

}

258

239

259

240

/*

260

241

* Initialize GPGME.

261

242

*/

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){

243

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

244

const char *tempdir){

267

245

gpgme_error_t rc;

268

246

gpgme_engine_info_t engine_info;

269

247

248

270

249

/*

271

250

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

272

251

*/

273

bool import_key(const char * const filename){

252

bool import_key(const char *filename){

274

253

int ret;

275

254

int fd;

276

255

gpgme_data_t pgp_data;

288

267

return false;

289

268

}

290

269

291

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

270

rc = gpgme_op_import(mc.ctx, pgp_data);

292

271

if(rc != GPG_ERR_NO_ERROR){

293

272

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

294

273

gpgme_strsource(rc), gpgme_strerror(rc));

338

317

}

339

318

340

319

/* Create new GPGME "context" */

341

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

320

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

342

321

if(rc != GPG_ERR_NO_ERROR){

343

322

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

344

323

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

357

336

* Decrypt OpenPGP data.

358

337

* Returns -1 on error

359

338

*/

360

__attribute__((nonnull, warn_unused_result))

361

339

static ssize_t pgp_packet_decrypt(const char *cryptotext,

362

340

size_t crypto_size,

363

char **plaintext,

364

mandos_context *mc){

341

char **plaintext){

365

342

gpgme_data_t dh_crypto, dh_plain;

366

343

gpgme_error_t rc;

367

344

ssize_t ret;

393

370

394

371

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

395

372

data buffer */

396

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

373

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

397

374

if(rc != GPG_ERR_NO_ERROR){

398

375

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

399

376

gpgme_strsource(rc), gpgme_strerror(rc));

400

377

plaintext_length = -1;

401

378

if(debug){

402

379

gpgme_decrypt_result_t result;

403

result = gpgme_op_decrypt_result(mc->ctx);

380

result = gpgme_op_decrypt_result(mc.ctx);

404

381

if(result == NULL){

405

382

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

406

383

} else {

483

460

return plaintext_length;

484

461

}

485

462

486

__attribute__((warn_unused_result))

487

static const char *safer_gnutls_strerror(int value){

488

const char *ret = gnutls_strerror(value);

463

static const char * safer_gnutls_strerror(int value){

464

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

465

-Wunreachable-code */

489

466

if(ret == NULL)

490

467

ret = "(unknown)";

491

468

return ret;

492

469

}

493

470

494

471

/* GnuTLS log function callback */

495

__attribute__((nonnull))

496

472

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

497

473

const char* string){

498

474

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

499

475

}

500

476

501

__attribute__((nonnull, warn_unused_result))

502

477

static int init_gnutls_global(const char *pubkeyfilename,

503

const char *seckeyfilename,

504

mandos_context *mc){

478

const char *seckeyfilename){

505

479

int ret;

506

480

507

481

if(debug){

524

498

}

525

499

526

500

/* OpenPGP credentials */

527

ret = gnutls_certificate_allocate_credentials(&mc->cred);

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

528

502

if(ret != GNUTLS_E_SUCCESS){

529

503

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

530

504

safer_gnutls_strerror(ret));

540

514

}

541

515

542

516

ret = gnutls_certificate_set_openpgp_key_file

543

(mc->cred, pubkeyfilename, seckeyfilename,

517

(mc.cred, pubkeyfilename, seckeyfilename,

544

518

GNUTLS_OPENPGP_FMT_BASE64);

545

519

if(ret != GNUTLS_E_SUCCESS){

546

520

fprintf_plus(stderr,

552

526

}

553

527

554

528

/* GnuTLS server initialization */

555

ret = gnutls_dh_params_init(&mc->dh_params);

529

ret = gnutls_dh_params_init(&mc.dh_params);

556

530

if(ret != GNUTLS_E_SUCCESS){

557

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

558

532

" initialization: %s\n",

559

533

safer_gnutls_strerror(ret));

560

534

goto globalfail;

561

535

}

562

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

536

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

563

537

if(ret != GNUTLS_E_SUCCESS){

564

538

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

565

539

safer_gnutls_strerror(ret));

566

540

goto globalfail;

567

541

}

568

542

569

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

543

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

570

544

571

545

return 0;

572

546

573

547

globalfail:

574

548

575

gnutls_certificate_free_credentials(mc->cred);

549

gnutls_certificate_free_credentials(mc.cred);

576

550

gnutls_global_deinit();

577

gnutls_dh_params_deinit(mc->dh_params);

551

gnutls_dh_params_deinit(mc.dh_params);

578

552

return -1;

579

553

}

580

554

581

__attribute__((nonnull, warn_unused_result))

582

static int init_gnutls_session(gnutls_session_t *session,

583

mandos_context *mc){

555

static int init_gnutls_session(gnutls_session_t *session){

584

556

int ret;

585

557

/* GnuTLS session creation */

586

558

do {

598

570

{

599

571

const char *err;

600

572

do {

601

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

573

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

602

574

if(quit_now){

603

575

gnutls_deinit(*session);

604

576

return -1;

615

587

616

588

do {

617

589

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

618

mc->cred);

590

mc.cred);

619

591

if(quit_now){

620

592

gnutls_deinit(*session);

621

593

return -1;

631

603

/* ignore client certificate if any. */

632

604

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

633

605

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

635

607

636

608

return 0;

637

609

}

641

613

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

642

614

643

615

/* Called when a Mandos server is found */

644

__attribute__((nonnull, warn_unused_result))

645

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

616

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

646

617

AvahiIfIndex if_index,

647

int af, mandos_context *mc){

618

int af){

648

619

int ret, tcp_sd = -1;

649

620

ssize_t sret;

650

struct sockaddr_storage to;

621

union {

622

struct sockaddr_in in;

623

struct sockaddr_in6 in6;

624

} to;

651

625

char *buffer = NULL;

652

626

char *decrypted_buffer = NULL;

653

627

size_t buffer_length = 0;

677

651

return -1;

678

652

}

679

653

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);

654

ret = init_gnutls_session(&session);

713

655

if(ret != 0){

714

656

return -1;

715

657

}

716

658

717

659

if(debug){

718

660

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

719

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

661

PRIu16 "\n", ip, port);

720

662

}

721

663

722

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

734

676

735

677

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

736

678

if(af == AF_INET6){

737

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

738

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

679

to.in6.sin6_family = (sa_family_t)af;

680

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

739

681

} else { /* IPv4 */

740

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

741

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

682

to.in.sin_family = (sa_family_t)af;

683

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

742

684

}

743

685

if(ret < 0 ){

744

686

int e = errno;

753

695

goto mandos_end;

754

696

}

755

697

if(af == AF_INET6){

756

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

757

if(IN6_IS_ADDR_LINKLOCAL

758

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

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*/

759

705

if(if_index == AVAHI_IF_UNSPEC){

760

706

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

761

707

" incomplete without a network interface\n");

763

709

goto mandos_end;

764

710

}

765

711

/* Set the network interface number as scope */

766

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

712

to.in6.sin6_scope_id = (uint32_t)if_index;

767

713

}

768

714

} else {

769

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

715

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

716

-Wconversion and

717

-Wunreachable-code */

770

718

}

771

719

772

720

if(quit_now){

780

728

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

781

729

perror_plus("if_indextoname");

782

730

} else {

783

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

784

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

731

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

732

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

785

733

}

786

734

} else {

787

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

788

ip, (uintmax_t)port);

735

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

736

ip, port);

789

737

}

790

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

791

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

740

const char *pcret;

792

741

if(af == AF_INET6){

793

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

794

sizeof(struct sockaddr_in6),

795

addrstr, sizeof(addrstr), NULL, 0,

796

NI_NUMERICHOST);

742

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

743

sizeof(addrstr));

797

744

} else {

798

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

799

sizeof(struct sockaddr_in),

800

addrstr, sizeof(addrstr), NULL, 0,

801

NI_NUMERICHOST);

745

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

746

sizeof(addrstr));

802

747

}

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);

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

}

809

754

}

810

755

}

811

756

815

760

}

816

761

817

762

if(af == AF_INET6){

818

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

819

sizeof(struct sockaddr_in6));

763

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

820

764

} else {

821

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

822

sizeof(struct sockaddr_in));

765

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

823

766

}

824

767

if(ret < 0){

825

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

768

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

826

769

int e = errno;

827

770

perror_plus("connect");

828

771

errno = e;

874

817

goto mandos_end;

875

818

}

876

819

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);

820

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

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

882

822

883

823

if(quit_now){

884

824

errno = EINTR;

989

929

if(buffer_length > 0){

990

930

ssize_t decrypted_buffer_size;

991

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

992

&decrypted_buffer, mc);

932

&decrypted_buffer);

993

933

if(decrypted_buffer_size >= 0){

994

934

995

935

written = 0;

1043

983

return retval;

1044

984

}

1045

985

1046

__attribute__((nonnull))

1047

986

static void resolve_callback(AvahiSServiceResolver *r,

1048

987

AvahiIfIndex interface,

1049

988

AvahiProtocol proto,

1057

996

AVAHI_GCC_UNUSED AvahiStringList *txt,

1058

997

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1059

998

flags,

1060

void *mc){

1061

if(r == NULL){

1062

return;

1063

}

999

AVAHI_GCC_UNUSED void* userdata){

1000

assert(r);

1064

1001

1065

1002

/* Called whenever a service has been resolved successfully or

1066

1003

timed out */

1075

1012

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

1076

1013

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

1077

1014

domain,

1078

avahi_strerror(avahi_server_errno

1079

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

1015

avahi_strerror(avahi_server_errno(mc.server)));

1080

1016

break;

1081

1017

1082

1018

case AVAHI_RESOLVER_FOUND:

1088

1024

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

1089

1025

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

1090

1026

}

1091

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

1092

interface,

1093

avahi_proto_to_af(proto),

1094

mc);

1027

int ret = start_mandos_communication(ip, port, interface,

1028

avahi_proto_to_af(proto));

1095

1029

if(ret == 0){

1096

avahi_simple_poll_quit(simple_poll);

1030

avahi_simple_poll_quit(mc.simple_poll);

1097

1031

} else {

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

}

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1104

1034

}

1105

1035

}

1106

1036

}

1116

1046

const char *domain,

1117

1047

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1118

1048

flags,

1119

void *mc){

1120

if(b == NULL){

1121

return;

1122

}

1049

AVAHI_GCC_UNUSED void* userdata){

1050

assert(b);

1123

1051

1124

1052

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

1125

1053

is removed from the LAN */

1133

1061

case AVAHI_BROWSER_FAILURE:

1134

1062

1135

1063

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

1136

avahi_strerror(avahi_server_errno

1137

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

1138

avahi_simple_poll_quit(simple_poll);

1064

avahi_strerror(avahi_server_errno(mc.server)));

1065

avahi_simple_poll_quit(mc.simple_poll);

1139

1066

return;

1140

1067

1141

1068

case AVAHI_BROWSER_NEW:

1144

1071

the callback function is called the Avahi server will free the

1145

1072

resolver for us. */

1146

1073

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)

1074

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

1075

name, type, domain, protocol, 0,

1076

resolve_callback, NULL) == NULL)

1151

1077

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

1152

1078

" %s\n", name,

1153

avahi_strerror(avahi_server_errno

1154

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

1079

avahi_strerror(avahi_server_errno(mc.server)));

1155

1080

break;

1156

1081

1157

1082

case AVAHI_BROWSER_REMOVE:

1176

1101

signal_received = sig;

1177

1102

int old_errno = errno;

1178

1103

/* set main loop to exit */

1179

if(simple_poll != NULL){

1180

avahi_simple_poll_quit(simple_poll);

1104

if(mc.simple_poll != NULL){

1105

avahi_simple_poll_quit(mc.simple_poll);

1181

1106

}

1182

1107

errno = old_errno;

1183

1108

}

1184

1109

1185

__attribute__((nonnull, warn_unused_result))

1186

1110

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

1187

1111

int ret;

1188

error_t ret_errno;

1189

1112

1190

1113

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

1191

1114

if(s < 0){

1192

ret_errno = errno;

1193

1115

perror_plus("socket");

1194

errno = ret_errno;

1195

1116

return false;

1196

1117

}

1197

1118

strcpy(ifr->ifr_name, ifname);

1198

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1199

1120

if(ret == -1){

1200

1121

if(debug){

1201

ret_errno = errno;

1202

1122

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1204

1123

}

1205

1124

return false;

1206

1125

}

1207

1126

return true;

1208

1127

}

1209

1128

1210

__attribute__((nonnull, warn_unused_result))

1211

1129

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

1212

1130

1213

1131

/* Reject the loopback device */

1255

1173

* corresponds to an acceptable network device.

1256

1174

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

1257

1175

*/

1258

__attribute__((nonnull, warn_unused_result))

1259

1176

int good_interface(const struct dirent *if_entry){

1260

1177

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

1261

1178

return 0;

1277

1194

}

1278

1195

1279

1196

/*

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))

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

1314

1239

int notdotentries(const struct dirent *direntry){

1315

1240

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

1316

1241

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

1323

1248

}

1324

1249

1325

1250

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

1326

__attribute__((nonnull, warn_unused_result))

1327

1251

int runnable_hook(const struct dirent *direntry){

1328

1252

int ret;

1329

1253

size_t sret;

1337

1261

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

1338

1262

"abcdefghijklmnopqrstuvwxyz"

1339

1263

"0123456789"

1340

"_.-");

1264

"_-");

1341

1265

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

1342

1266

/* Contains non-allowed characters */

1343

1267

if(debug){

1347

1271

return 0;

1348

1272

}

1349

1273

1350

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

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);

1351

1282

if(ret == -1){

1352

1283

if(debug){

1353

1284

perror_plus("Could not stat hook");

1370

1301

}

1371

1302

return 0;

1372

1303

}

1373

if(debug){

1374

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

1375

direntry->d_name);

1376

}

1377

1304

return 1;

1378

1305

}

1379

1306

1380

__attribute__((nonnull, warn_unused_result))

1381

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1382

mandos_context *mc){

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1383

1308

int ret;

1384

1309

struct timespec now;

1385

1310

struct timespec waited_time;

1386

1311

intmax_t block_time;

1387

1312

1388

1313

while(true){

1389

if(mc->current_server == NULL){

1390

if(debug){

1314

if(mc.current_server == NULL){

1315

if (debug){

1391

1316

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

1392

1317

" No timeout!\n");

1393

1318

}

1394

1319

ret = avahi_simple_poll_iterate(s, -1);

1395

1320

} else {

1396

if(debug){

1321

if (debug){

1397

1322

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

1398

1323

" it, or wait\n");

1399

1324

}

1406

1331

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

1407

1332

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

1408

1333

waited_time.tv_sec = (now.tv_sec

1409

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

1334

- mc.current_server->last_seen.tv_sec);

1410

1335

waited_time.tv_nsec = (now.tv_nsec

1411

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

1336

- mc.current_server->last_seen.tv_nsec);

1412

1337

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

1413

1338

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

1414

1339

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

1416

1341

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

1417

1342

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

1418

1343

1419

if(debug){

1344

if (debug){

1420

1345

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

1421

1346

block_time);

1422

1347

}

1423

1348

1424

1349

if(block_time <= 0){

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);

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);

1429

1354

if(ret == 0){

1430

avahi_simple_poll_quit(s);

1355

avahi_simple_poll_quit(mc.simple_poll);

1431

1356

return 0;

1432

1357

}

1433

1358

ret = clock_gettime(CLOCK_MONOTONIC,

1434

&mc->current_server->last_seen);

1359

&mc.current_server->last_seen);

1435

1360

if(ret == -1){

1436

1361

perror_plus("clock_gettime");

1437

1362

return -1;

1438

1363

}

1439

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

1364

mc.current_server = mc.current_server->next;

1440

1365

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

1441

1366

servers, but don't block */

1442

1367

}

1444

1369

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

1445

1370

}

1446

1371

if(ret != 0){

1447

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

1372

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

1448

1373

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

1449

1374

}

1450

1375

}

1451

1376

}

1452

1377

}

1453

1378

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

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

__attribute__((warn_unused_result))

1469

error_t raise_privileges_permanently(void){

1470

error_t old_errno = errno;

1471

error_t ret_errno = raise_privileges();

1472

if(ret_errno != 0){

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

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

1477

ret_errno = errno;

1478

perror_plus("seteuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

__attribute__((warn_unused_result))

1486

error_t lower_privileges(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("seteuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

perror_plus("setuid");

1505

}

1506

errno = old_errno;

1507

return ret_errno;

1508

}

1509

1510

#ifndef O_CLOEXEC

1511

/*

1512

* Based on the example in the GNU LibC manual chapter 13.13 "File

1513

* Descriptor Flags".

1514

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

1515

*/

1516

__attribute__((warn_unused_result))

1517

static int set_cloexec_flag(int fd){

1518

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

1519

/* If reading the flags failed, return error indication now. */

1520

if(ret < 0){

1521

return ret;

1522

}

1523

/* Store modified flag word in the descriptor. */

1524

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

1525

ret | FD_CLOEXEC));

1526

}

1527

#endif /* not O_CLOEXEC */

1528

1529

__attribute__((nonnull))

1530

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

1379

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

1531

1380

const float delay){

1532

1381

struct dirent **direntries;

1533

if(hookdir_fd == -1){

1534

hookdir_fd = open(hookdir, O_RDONLY |

1535

#ifdef O_CLOEXEC

1536

O_CLOEXEC

1537

#else /* not O_CLOEXEC */

1538

0

1539

#endif /* not O_CLOEXEC */

1540

);

1541

if(hookdir_fd == -1){

1542

if(errno == ENOENT){

1543

if(debug){

1544

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

1545

" found\n", hookdir);

1546

}

1547

} else {

1548

perror_plus("open");

1549

}

1550

return;

1551

}

1552

#ifndef O_CLOEXEC

1553

if(set_cloexec_flag(hookdir_fd) < 0){

1554

perror_plus("set_cloexec_flag");

1555

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

1556

perror_plus("close");

1557

} else {

1558

hookdir_fd = -1;

1559

}

1560

return;

1561

}

1562

#endif /* not O_CLOEXEC */

1563

}

1564

#ifdef __GLIBC__

1565

#if __GLIBC_PREREQ(2, 15)

1566

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

1567

runnable_hook, alphasort);

1568

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

1569

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

1570

alphasort);

1571

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

1572

#else /* not __GLIBC__ */

1573

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

1574

alphasort);

1575

#endif /* not __GLIBC__ */

1382

struct dirent *direntry;

1383

int ret;

1384

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

1385

alphasort);

1576

1386

if(numhooks == -1){

1577

1387

perror_plus("scandir");

1578

return;

1579

}

1580

struct dirent *direntry;

1581

int ret;

1582

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

1583

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

1584

direntry = direntries[i];

1585

if(debug){

1586

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

1587

direntry->d_name);

1588

}

1589

pid_t hook_pid = fork();

1590

if(hook_pid == 0){

1591

/* Child */

1592

/* Raise privileges */

1593

if(raise_privileges_permanently() != 0){

1594

perror_plus("Failed to raise privileges");

1595

_exit(EX_NOPERM);

1596

}

1597

/* Set group */

1598

errno = 0;

1599

ret = setgid(0);

1600

if(ret == -1){

1601

perror_plus("setgid");

1602

_exit(EX_NOPERM);

1603

}

1604

/* Reset supplementary groups */

1605

errno = 0;

1606

ret = setgroups(0, NULL);

1607

if(ret == -1){

1608

perror_plus("setgroups");

1609

_exit(EX_NOPERM);

1610

}

1611

ret = dup2(devnull, STDIN_FILENO);

1612

if(ret == -1){

1613

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

1614

_exit(EX_OSERR);

1615

}

1616

ret = close(devnull);

1617

if(ret == -1){

1618

perror_plus("close");

1619

_exit(EX_OSERR);

1620

}

1621

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1622

if(ret == -1){

1623

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

1624

_exit(EX_OSERR);

1625

}

1626

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

1627

if(ret == -1){

1628

perror_plus("setenv");

1629

_exit(EX_OSERR);

1630

}

1631

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

1632

if(ret == -1){

1633

perror_plus("setenv");

1634

_exit(EX_OSERR);

1635

}

1636

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

1637

if(ret == -1){

1638

perror_plus("setenv");

1639

_exit(EX_OSERR);

1640

}

1641

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

1642

if(ret == -1){

1643

perror_plus("setenv");

1644

_exit(EX_OSERR);

1645

}

1646

char *delaystring;

1647

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

1648

if(ret == -1){

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){

1649

1395

perror_plus("asprintf");

1650

_exit(EX_OSERR);

1396

continue;

1651

1397

}

1652

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

1653

if(ret == -1){

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

}

1654

1436

free(delaystring);

1655

perror_plus("setenv");

1656

_exit(EX_OSERR);

1657

}

1658

free(delaystring);

1659

if(connect_to != NULL){

1660

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

1661

if(ret == -1){

1662

perror_plus("setenv");

1663

_exit(EX_OSERR);

1664

}

1665

}

1666

if(fexecve(hookdir_fd, (char *const [])

1667

{ direntry->d_name, NULL }, environ) == -1){

1668

perror_plus("fexecve");

1669

_exit(EXIT_FAILURE);

1670

}

1671

} else {

1672

int status;

1673

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

1674

perror_plus("waitpid");

1675

continue;

1676

}

1677

if(WIFEXITED(status)){

1678

if(WEXITSTATUS(status) != 0){

1679

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

1680

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

1681

WEXITSTATUS(status));

1682

continue;

1683

}

1684

} else if(WIFSIGNALED(status)){

1685

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

1686

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

1687

WTERMSIG(status));

1688

continue;

1689

} else {

1690

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

1691

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

1692

continue;

1693

}

1694

}

1695

if(debug){

1696

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

1697

direntry->d_name);

1698

}

1699

}

1700

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

1701

perror_plus("close");

1702

} else {

1703

hookdir_fd = -1;

1704

}

1705

close(devnull);

1706

}

1707

1708

__attribute__((nonnull, warn_unused_result))

1709

error_t bring_up_interface(const char *const interface,

1710

const float delay){

1711

error_t old_errno = errno;

1712

int ret;

1713

struct ifreq network;

1714

unsigned int if_index = if_nametoindex(interface);

1715

if(if_index == 0){

1716

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

1717

errno = old_errno;

1718

return ENXIO;

1719

}

1720

1721

if(quit_now){

1722

errno = old_errno;

1723

return EINTR;

1724

}

1725

1726

if(not interface_is_up(interface)){

1727

error_t ret_errno = 0, ioctl_errno = 0;

1728

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

1729

ret_errno = errno;

1730

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

1731

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

1732

errno = old_errno;

1733

return ret_errno;

1734

}

1735

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

1736

1737

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

1738

if(sd == -1){

1739

ret_errno = errno;

1740

perror_plus("socket");

1741

errno = old_errno;

1742

return ret_errno;

1743

}

1744

1745

if(quit_now){

1746

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

1747

if(ret == -1){

1748

perror_plus("close");

1749

}

1750

errno = old_errno;

1751

return EINTR;

1752

}

1753

1754

if(debug){

1755

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

1756

interface);

1757

}

1758

1759

/* Raise privileges */

1760

ret_errno = raise_privileges();

1761

if(ret_errno != 0){

1762

perror_plus("Failed to raise privileges");

1763

}

1764

1765

#ifdef __linux__

1766

int ret_linux;

1767

bool restore_loglevel = false;

1768

if(ret_errno == 0){

1769

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1770

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

1771

ret_linux = klogctl(8, NULL, 5);

1772

if(ret_linux == -1){

1773

perror_plus("klogctl");

1774

} else {

1775

restore_loglevel = true;

1776

}

1777

}

1778

#endif /* __linux__ */

1779

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

1780

ioctl_errno = errno;

1781

#ifdef __linux__

1782

if(restore_loglevel){

1783

ret_linux = klogctl(7, NULL, 0);

1784

if(ret_linux == -1){

1785

perror_plus("klogctl");

1786

}

1787

}

1788

#endif /* __linux__ */

1789

1790

/* If raise_privileges() succeeded above */

1791

if(ret_errno == 0){

1792

/* Lower privileges */

1793

ret_errno = lower_privileges();

1794

if(ret_errno != 0){

1795

errno = ret_errno;

1796

perror_plus("Failed to lower privileges");

1797

}

1798

}

1799

1800

/* Close the socket */

1801

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

1802

if(ret == -1){

1803

perror_plus("close");

1804

}

1805

1806

if(ret_setflags == -1){

1807

errno = ioctl_errno;

1808

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1809

errno = old_errno;

1810

return ioctl_errno;

1811

}

1812

} else if(debug){

1813

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

1814

interface);

1815

}

1816

1817

/* Sleep checking until interface is running.

1818

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

1819

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

1820

if(interface_is_running(interface)){

1821

break;

1822

}

1823

struct timespec sleeptime = { .tv_nsec = 250000000 };

1824

ret = nanosleep(&sleeptime, NULL);

1825

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

1826

perror_plus("nanosleep");

1827

}

1828

}

1829

1830

errno = old_errno;

1831

return 0;

1832

}

1833

1834

__attribute__((nonnull, warn_unused_result))

1835

error_t take_down_interface(const char *const interface){

1836

error_t old_errno = errno;

1837

struct ifreq network;

1838

unsigned int if_index = if_nametoindex(interface);

1839

if(if_index == 0){

1840

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

1841

errno = old_errno;

1842

return ENXIO;

1843

}

1844

if(interface_is_up(interface)){

1845

error_t ret_errno = 0, ioctl_errno = 0;

1846

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

1847

ret_errno = errno;

1848

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

1849

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

1850

errno = old_errno;

1851

return ret_errno;

1852

}

1853

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

1854

1855

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

1856

if(sd == -1){

1857

ret_errno = errno;

1858

perror_plus("socket");

1859

errno = old_errno;

1860

return ret_errno;

1861

}

1862

1863

if(debug){

1864

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

1865

interface);

1866

}

1867

1868

/* Raise privileges */

1869

ret_errno = raise_privileges();

1870

if(ret_errno != 0){

1871

perror_plus("Failed to raise privileges");

1872

}

1873

1874

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

1875

ioctl_errno = errno;

1876

1877

/* If raise_privileges() succeeded above */

1878

if(ret_errno == 0){

1879

/* Lower privileges */

1880

ret_errno = lower_privileges();

1881

if(ret_errno != 0){

1882

errno = ret_errno;

1883

perror_plus("Failed to lower privileges");

1884

}

1885

}

1886

1887

/* Close the socket */

1888

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

1889

if(ret == -1){

1890

perror_plus("close");

1891

}

1892

1893

if(ret_setflags == -1){

1894

errno = ioctl_errno;

1895

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1896

errno = old_errno;

1897

return ioctl_errno;

1898

}

1899

} else if(debug){

1900

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

1901

interface);

1902

}

1903

1904

errno = old_errno;

1905

return 0;

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;

1906

1475

}

1907

1476

1908

1477

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

1909

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

1910

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

1911

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

1912

.interfaces = NULL, .interfaces_size = 0 };

1913

1478

AvahiSServiceBrowser *sb = NULL;

1914

error_t ret_errno;

1479

int error;

1915

1480

int ret;

1916

1481

intmax_t tmpmax;

1917

1482

char *tmp;

1918

1483

int exitcode = EXIT_SUCCESS;

1919

char *interfaces_to_take_down = NULL;

1920

size_t interfaces_to_take_down_size = 0;

1921

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

1922

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

1923

char *tempdir = NULL;

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;

1924

1492

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1925

1493

const char *seckey = PATHDIR "/" SECKEY;

1926

1494

const char *pubkey = PATHDIR "/" PUBKEY;

1927

char *interfaces_hooks = NULL;

1928

1495

1929

1496

bool gnutls_initialized = false;

1930

1497

bool gpgme_initialized = false;

1992

1559

.group = 2 },

1993

1560

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

1994

1561

.arg = "SECONDS",

1995

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

1562

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

1996

1563

.group = 2 },

1997

1564

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

1998

1565

.arg = "DIR",

2021

1588

connect_to = arg;

2022

1589

break;

2023

1590

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

2024

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

2025

arg, (int)',');

2026

if(ret_errno != 0){

2027

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

2028

}

1591

interface = arg;

2029

1592

break;

2030

1593

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

2031

1594

seckey = arg;

2074

1637

argp_state_help(state, state->out_stream,

2075

1638

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2076

1639

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

2077

1642

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

2078

1643

exit(argp_err_exit_status);

2079

1644

break;

2107

1672

{

2108

1673

/* Work around Debian bug #633582:

2109

1674

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

2110

2111

/* Re-raise privileges */

2112

ret_errno = raise_privileges();

2113

if(ret_errno != 0){

2114

errno = ret_errno;

2115

perror_plus("Failed to raise privileges");

2116

} else {

2117

struct stat st;

2118

2119

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

2120

int seckey_fd = open(seckey, O_RDONLY);

2121

if(seckey_fd == -1){

2122

perror_plus("open");

2123

} else {

2124

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

2125

if(ret == -1){

2126

perror_plus("fstat");

2127

} else {

2128

if(S_ISREG(st.st_mode)

2129

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

2130

ret = fchown(seckey_fd, uid, gid);

2131

if(ret == -1){

2132

perror_plus("fchown");

2133

}

2134

}

2135

}

2136

TEMP_FAILURE_RETRY(close(seckey_fd));

2137

}

2138

}

2139

2140

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

2141

int pubkey_fd = open(pubkey, O_RDONLY);

2142

if(pubkey_fd == -1){

2143

perror_plus("open");

2144

} else {

2145

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

2146

if(ret == -1){

2147

perror_plus("fstat");

2148

} else {

2149

if(S_ISREG(st.st_mode)

2150

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

2151

ret = fchown(pubkey_fd, uid, gid);

2152

if(ret == -1){

2153

perror_plus("fchown");

2154

}

2155

}

2156

}

2157

TEMP_FAILURE_RETRY(close(pubkey_fd));

2158

}

2159

}

2160

2161

/* Lower privileges */

2162

ret_errno = lower_privileges();

2163

if(ret_errno != 0){

2164

errno = ret_errno;

2165

perror_plus("Failed to lower privileges");

2166

}

2167

}

2168

}

2169

2170

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

2171

{

2172

char *interface = NULL;

2173

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

2174

interface))){

2175

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

2176

and if_nametoindex(interface) == 0){

2177

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

2178

fprintf_plus(stderr, "Not using nonexisting interface"

2179

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

2180

}

2181

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

2182

interface = NULL;

2183

}

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");

2184

1731

}

2185

1732

}

2186

1733

2187

1734

/* Run network hooks */

2188

1735

{

2189

if(mc.interfaces != NULL){

2190

interfaces_hooks = malloc(mc.interfaces_size);

2191

if(interfaces_hooks == NULL){

2192

perror_plus("malloc");

2193

goto end;

2194

}

2195

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

2196

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

2197

}

2198

run_network_hooks("start", interfaces_hooks != NULL ?

2199

interfaces_hooks : "", delay);

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

}

2200

1751

}

2201

1752

2202

1753

if(not debug){

2203

1754

avahi_set_log_function(empty_log);

2204

1755

}

2205

1756

1757

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

1758

struct dirent **direntries;

1759

/* First look for interfaces that are up */

1760

ret = scandir(sys_class_net, &direntries, up_interface,

1761

alphasort);

1762

if(ret == 0){

1763

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

1764

free(direntries);

1765

ret = scandir(sys_class_net, &direntries, good_interface,

1766

alphasort);

1767

}

1768

if(ret >= 1){

1769

/* Pick the first interface returned */

1770

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

1771

if(debug){

1772

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

1773

}

1774

if(interface == NULL){

1775

perror_plus("malloc");

1776

free(direntries);

1777

exitcode = EXIT_FAILURE;

1778

goto end;

1779

}

1780

free(direntries);

1781

} else {

1782

free(direntries);

1783

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

1784

exitcode = EXIT_FAILURE;

1785

goto end;

1786

}

1787

}

1788

2206

1789

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

2207

1790

from the signal handler */

2208

1791

/* Initialize the pseudo-RNG for Avahi */

2209

1792

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

2210

simple_poll = avahi_simple_poll_new();

2211

if(simple_poll == NULL){

1793

mc.simple_poll = avahi_simple_poll_new();

1794

if(mc.simple_poll == NULL){

2212

1795

fprintf_plus(stderr,

2213

1796

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

2214

1797

exitcode = EX_UNAVAILABLE;

2278

1861

}

2279

1862

}

2280

1863

2281

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

2282

if(mc.interfaces == NULL){

2283

struct dirent **direntries;

2284

/* Look for any good interfaces */

2285

ret = scandir(sys_class_net, &direntries, good_interface,

2286

alphasort);

2287

if(ret >= 1){

2288

/* Add all found interfaces to interfaces list */

2289

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

2290

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

2291

direntries[i]->d_name);

2292

if(ret_errno != 0){

2293

errno = ret_errno;

2294

perror_plus("argz_add");

2295

continue;

2296

}

2297

if(debug){

2298

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

2299

direntries[i]->d_name);

2300

}

2301

}

2302

free(direntries);

2303

} else {

2304

free(direntries);

2305

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

2306

exitcode = EXIT_FAILURE;

2307

goto end;

2308

}

2309

}

2310

2311

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

2312

{

2313

char *interface = NULL;

2314

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

2315

interface))){

2316

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

2317

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

2318

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

2319

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

2320

interface);

2321

interface = NULL;

2322

while((interface = argz_next(mc.interfaces,

2323

mc.interfaces_size, interface))){

2324

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

2325

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

2326

interface);

2327

interface = NULL;

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");

2328

1949

}

2329

1950

}

1951

#endif /* __linux__ */

1952

/* Lower privileges */

1953

errno = 0;

1954

ret = seteuid(uid);

1955

if(ret == -1){

1956

perror_plus("seteuid");

1957

}

1958

goto end;

1959

}

1960

}

1961

/* Sleep checking until interface is running.

1962

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

1963

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

1964

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

1965

if(ret == -1){

1966

perror_plus("ioctl SIOCGIFFLAGS");

1967

} else if(network.ifr_flags & IFF_RUNNING){

2330

1968

break;

2331

1969

}

2332

bool interface_was_up = interface_is_up(interface);

2333

errno = bring_up_interface(interface, delay);

2334

if(not interface_was_up){

2335

if(errno != 0){

2336

perror_plus("Failed to bring up interface");

2337

} else {

2338

errno = argz_add(&interfaces_to_take_down,

2339

&interfaces_to_take_down_size,

2340

interface);

2341

if(errno != 0){

2342

perror_plus("argz_add");

2343

}

2344

}

2345

}

2346

}

2347

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

2348

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

2349

}

2350

}

2351

2352

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

2353

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

2354

if(debug){

2355

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

2356

mc.interfaces);

2357

}

2358

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

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

}

2359

1999

}

2360

2000

2361

2001

if(quit_now){

2362

2002

goto end;

2363

2003

}

2364

2004

2365

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

2005

ret = init_gnutls_global(pubkey, seckey);

2366

2006

if(ret == -1){

2367

2007

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

2368

2008

exitcode = EX_UNAVAILABLE;

2375

2015

goto end;

2376

2016

}

2377

2017

2378

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

2379

tempdir = mkdtemp(run_tempdir);

2380

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

2381

if(debug){

2382

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

2383

run_tempdir, old_tempdir);

2384

}

2385

tempdir = mkdtemp(old_tempdir);

2386

}

2387

if(tempdir == NULL){

2018

if(mkdtemp(tempdir) == NULL){

2388

2019

perror_plus("mkdtemp");

2389

2020

goto end;

2390

2021

}

2022

tempdir_created = true;

2391

2023

2392

2024

if(quit_now){

2393

2025

goto end;

2394

2026

}

2395

2027

2396

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

2028

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

2397

2029

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

2398

2030

exitcode = EX_UNAVAILABLE;

2399

2031

goto end;

2409

2041

/* Connect directly, do not use Zeroconf */

2410

2042

/* (Mainly meant for debugging) */

2411

2043

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

2412

2413

2044

if(address == NULL){

2414

2045

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

2415

2046

exitcode = EX_USAGE;

2420

2051

goto end;

2421

2052

}

2422

2053

2423

in_port_t port;

2054

uint16_t port;

2424

2055

errno = 0;

2425

2056

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

2426

2057

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

2427

or tmpmax != (in_port_t)tmpmax){

2058

or tmpmax != (uint16_t)tmpmax){

2428

2059

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

2429

2060

exitcode = EX_USAGE;

2430

2061

goto end;

2431

2062

}

2432

2063

2433

2064

if(quit_now){

2434

2065

goto end;

2435

2066

}

2436

2067

2437

port = (in_port_t)tmpmax;

2068

port = (uint16_t)tmpmax;

2438

2069

*address = '\0';

2439

2070

/* Colon in address indicates IPv6 */

2440

2071

int af;

2456

2087

}

2457

2088

2458

2089

while(not quit_now){

2459

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

2460

&mc);

2090

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

2461

2091

if(quit_now or ret == 0){

2462

2092

break;

2463

2093

}

2465

2095

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

2466

2096

(int)retry_interval);

2467

2097

}

2468

sleep((unsigned int)retry_interval);

2098

sleep((int)retry_interval);

2469

2099

}

2470

2100

2471

if(not quit_now){

2101

if (not quit_now){

2472

2102

exitcode = EXIT_SUCCESS;

2473

2103

}

2474

2104

2489

2119

config.publish_domain = 0;

2490

2120

2491

2121

/* Allocate a new server */

2492

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2493

&config, NULL, NULL, &ret_errno);

2122

mc.server = avahi_server_new(avahi_simple_poll_get

2123

(mc.simple_poll), &config, NULL,

2124

NULL, &error);

2494

2125

2495

2126

/* Free the Avahi configuration data */

2496

2127

avahi_server_config_free(&config);

2499

2130

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

2500

2131

if(mc.server == NULL){

2501

2132

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

2502

avahi_strerror(ret_errno));

2133

avahi_strerror(error));

2503

2134

exitcode = EX_UNAVAILABLE;

2504

2135

goto end;

2505

2136

}

2511

2142

/* Create the Avahi service browser */

2512

2143

sb = avahi_s_service_browser_new(mc.server, if_index,

2513

2144

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2514

NULL, 0, browse_callback,

2515

(void *)&mc);

2145

NULL, 0, browse_callback, NULL);

2516

2146

if(sb == NULL){

2517

2147

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

2518

2148

avahi_strerror(avahi_server_errno(mc.server)));

2529

2159

if(debug){

2530

2160

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

2531

2161

}

2532

2533

ret = avahi_loop_with_timeout(simple_poll,

2534

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

2162

2163

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

(int)(retry_interval * 1000));

2535

2165

if(debug){

2536

2166

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

2537

2167

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

2544

2174

}

2545

2175

2546

2176

/* Cleanup things */

2547

free(mc.interfaces);

2548

2549

2177

if(sb != NULL)

2550

2178

avahi_s_service_browser_free(sb);

2551

2179

2552

2180

if(mc.server != NULL)

2553

2181

avahi_server_free(mc.server);

2554

2182

2555

if(simple_poll != NULL)

2556

avahi_simple_poll_free(simple_poll);

2183

if(mc.simple_poll != NULL)

2184

avahi_simple_poll_free(mc.simple_poll);

2557

2185

2558

2186

if(gnutls_initialized){

2559

2187

gnutls_certificate_free_credentials(mc.cred);

2564

2192

if(gpgme_initialized){

2565

2193

gpgme_release(mc.ctx);

2566

2194

}

2567

2195

2568

2196

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

2569

2197

has seen */

2570

2198

if(mc.current_server != NULL){

2576

2204

}

2577

2205

}

2578

2206

2579

/* Re-raise privileges */

2207

/* Re-raise priviliges */

2580

2208

{

2581

ret_errno = raise_privileges();

2582

if(ret_errno != 0){

2583

perror_plus("Failed to raise privileges");

2584

} else {

2585

2586

/* Run network hooks */

2587

run_network_hooks("stop", interfaces_hooks != NULL ?

2588

interfaces_hooks : "", delay);

2589

2590

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

2591

{

2592

char *interface = NULL;

2593

while((interface=argz_next(interfaces_to_take_down,

2594

interfaces_to_take_down_size,

2595

interface))){

2596

ret_errno = take_down_interface(interface);

2597

if(ret_errno != 0){

2598

errno = ret_errno;

2599

perror_plus("Failed to take down interface");

2600

}

2601

}

2602

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

2603

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

2604

" down\n");

2605

}

2606

}

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;

2607

2217

}

2608

2218

2609

ret_errno = lower_privileges_permanently();

2610

if(ret_errno != 0){

2611

perror_plus("Failed to lower privileges permanently");

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

}

2612

2235

}

2613

2236

}

2614

2615

free(interfaces_to_take_down);

2616

free(interfaces_hooks);

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2617

2243

2618

2244

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

2619

if(tempdir != NULL){

2245

if(tempdir_created){

2620

2246

struct dirent **direntries = NULL;

2621

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

2622

if(tempdir_fd == -1){

2623

perror_plus("open");

2624

} else {

2625

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

2626

alphasort);

2627

if(numentries > 0){

2628

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

2629

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

2630

if(ret == -1){

2631

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

2632

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

2633

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

2634

}

2635

}

2636

2637

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

2638

free(direntries);

2639

if(numentries == -1){

2640

perror_plus("scandir");

2641

}

2642

ret = rmdir(tempdir);

2643

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

2644

perror_plus("rmdir");

2645

}

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);

2646

2266

}

2647

TEMP_FAILURE_RETRY(close(tempdir_fd));

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");

2648

2277

}

2649

2278

}

2650

2279