/mandos/trunk : revision 713

9

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

10

*

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* Everything else is

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13

12

13

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*

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

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#endif /* not _FILE_OFFSET_BITS */

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40

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

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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(),

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strtof(), abort() */

55

opendir(), DIR */

56

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

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

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inet_pton(), connect() */

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#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()

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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

*/

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

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

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setgid(), pause() */

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

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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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WEXITSTATUS(), WTERMSIG() */

91

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

92

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

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argz_delete(), argz_append(),

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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

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

free(new_server->ip);

244

free(new_server);

245

return false;

219

246

}

220

247

/* Special case of first server */

221

if (mc.current_server == NULL){

248

if(*current_server == NULL){

222

249

new_server->next = new_server;

223

250

new_server->prev = new_server;

224

mc.current_server = new_server;

225

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

251

*current_server = new_server;

226

252

} else {

227

new_server->next = mc.current_server;

228

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

253

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

254

new_server->next = *current_server;

255

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

229

256

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;

257

(*current_server)->prev = new_server;

258

}

259

return true;

238

260

}

239

261

240

262

/*

241

263

* Initialize GPGME.

242

264

*/

243

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

244

const char *tempdir){

265

__attribute__((nonnull, warn_unused_result))

266

static bool init_gpgme(const char * const seckey,

267

const char * const pubkey,

268

const char * const tempdir,

269

mandos_context *mc){

245

270

gpgme_error_t rc;

246

271

gpgme_engine_info_t engine_info;

247

272

248

249

273

/*

250

274

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

251

275

*/

252

bool import_key(const char *filename){

276

bool import_key(const char * const filename){

253

277

int ret;

254

278

int fd;

255

279

gpgme_data_t pgp_data;

267

291

return false;

268

292

}

269

293

270

rc = gpgme_op_import(mc.ctx, pgp_data);

294

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

271

295

if(rc != GPG_ERR_NO_ERROR){

272

296

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

273

297

gpgme_strsource(rc), gpgme_strerror(rc));

317

341

}

318

342

319

343

/* Create new GPGME "context" */

320

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

344

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

321

345

if(rc != GPG_ERR_NO_ERROR){

322

346

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

323

347

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

336

360

* Decrypt OpenPGP data.

337

361

* Returns -1 on error

338

362

*/

363

__attribute__((nonnull, warn_unused_result))

339

364

static ssize_t pgp_packet_decrypt(const char *cryptotext,

340

365

size_t crypto_size,

341

char **plaintext){

366

char **plaintext,

367

mandos_context *mc){

342

368

gpgme_data_t dh_crypto, dh_plain;

343

369

gpgme_error_t rc;

344

370

ssize_t ret;

370

396

371

397

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

372

398

data buffer */

373

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

399

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

374

400

if(rc != GPG_ERR_NO_ERROR){

375

401

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

376

402

gpgme_strsource(rc), gpgme_strerror(rc));

377

403

plaintext_length = -1;

378

404

if(debug){

379

405

gpgme_decrypt_result_t result;

380

result = gpgme_op_decrypt_result(mc.ctx);

406

result = gpgme_op_decrypt_result(mc->ctx);

381

407

if(result == NULL){

382

408

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

383

409

} else {

460

486

return plaintext_length;

461

487

}

462

488

463

static const char * safer_gnutls_strerror(int value){

464

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

465

-Wunreachable-code */

489

__attribute__((warn_unused_result))

490

static const char *safer_gnutls_strerror(int value){

491

const char *ret = gnutls_strerror(value);

466

492

if(ret == NULL)

467

493

ret = "(unknown)";

468

494

return ret;

469

495

}

470

496

471

497

/* GnuTLS log function callback */

498

__attribute__((nonnull))

472

499

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

473

500

const char* string){

474

501

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

475

502

}

476

503

504

__attribute__((nonnull, warn_unused_result))

477

505

static int init_gnutls_global(const char *pubkeyfilename,

478

const char *seckeyfilename){

506

const char *seckeyfilename,

507

mandos_context *mc){

479

508

int ret;

480

509

481

510

if(debug){

498

527

}

499

528

500

529

/* OpenPGP credentials */

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

530

ret = gnutls_certificate_allocate_credentials(&mc->cred);

502

531

if(ret != GNUTLS_E_SUCCESS){

503

532

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

504

533

safer_gnutls_strerror(ret));

514

543

}

515

544

516

545

ret = gnutls_certificate_set_openpgp_key_file

517

(mc.cred, pubkeyfilename, seckeyfilename,

546

(mc->cred, pubkeyfilename, seckeyfilename,

518

547

GNUTLS_OPENPGP_FMT_BASE64);

519

548

if(ret != GNUTLS_E_SUCCESS){

520

549

fprintf_plus(stderr,

526

555

}

527

556

528

557

/* GnuTLS server initialization */

529

ret = gnutls_dh_params_init(&mc.dh_params);

558

ret = gnutls_dh_params_init(&mc->dh_params);

530

559

if(ret != GNUTLS_E_SUCCESS){

531

560

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

561

" initialization: %s\n",

533

562

safer_gnutls_strerror(ret));

534

563

goto globalfail;

535

564

}

536

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

565

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

537

566

if(ret != GNUTLS_E_SUCCESS){

538

567

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

539

568

safer_gnutls_strerror(ret));

540

569

goto globalfail;

541

570

}

542

571

543

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

572

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

544

573

545

574

return 0;

546

575

547

576

globalfail:

548

577

549

gnutls_certificate_free_credentials(mc.cred);

578

gnutls_certificate_free_credentials(mc->cred);

550

579

gnutls_global_deinit();

551

gnutls_dh_params_deinit(mc.dh_params);

580

gnutls_dh_params_deinit(mc->dh_params);

552

581

return -1;

553

582

}

554

583

555

static int init_gnutls_session(gnutls_session_t *session){

584

__attribute__((nonnull, warn_unused_result))

585

static int init_gnutls_session(gnutls_session_t *session,

586

mandos_context *mc){

556

587

int ret;

557

588

/* GnuTLS session creation */

558

589

do {

570

601

{

571

602

const char *err;

572

603

do {

573

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

604

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

574

605

if(quit_now){

575

606

gnutls_deinit(*session);

576

607

return -1;

587

618

588

619

do {

589

620

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

590

mc.cred);

621

mc->cred);

591

622

if(quit_now){

592

623

gnutls_deinit(*session);

593

624

return -1;

603

634

/* ignore client certificate if any. */

604

635

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

605

636

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

637

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

607

638

608

639

return 0;

609

640

}

613

644

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

614

645

615

646

/* Called when a Mandos server is found */

616

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

647

__attribute__((nonnull, warn_unused_result))

648

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

617

649

AvahiIfIndex if_index,

618

int af){

650

int af, mandos_context *mc){

619

651

int ret, tcp_sd = -1;

620

652

ssize_t sret;

621

union {

622

struct sockaddr_in in;

623

struct sockaddr_in6 in6;

624

} to;

653

struct sockaddr_storage to;

625

654

char *buffer = NULL;

626

655

char *decrypted_buffer = NULL;

627

656

size_t buffer_length = 0;

651

680

return -1;

652

681

}

653

682

654

ret = init_gnutls_session(&session);

683

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

684

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

685

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

686

bool match = false;

687

{

688

char *interface = NULL;

689

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

690

interface))){

691

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

692

match = true;

693

break;

694

}

695

}

696

}

697

if(not match){

698

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

699

connect to the server */

700

if(debug){

701

char interface[IF_NAMESIZE];

702

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

703

perror_plus("if_indextoname");

704

} else {

705

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

706

" \"%s\"\n",

707

if_indextoname((unsigned int)if_index,

708

interface));

709

}

710

}

711

return -1;

712

}

713

}

714

715

ret = init_gnutls_session(&session, mc);

655

716

if(ret != 0){

656

717

return -1;

657

718

}

658

719

659

720

if(debug){

660

721

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

661

PRIu16 "\n", ip, port);

722

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

662

723

}

663

724

664

725

tcp_sd = socket(pf, SOCK_STREAM, 0);

676

737

677

738

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

678

739

if(af == AF_INET6){

679

to.in6.sin6_family = (sa_family_t)af;

680

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

740

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

741

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

681

742

} else { /* IPv4 */

682

to.in.sin_family = (sa_family_t)af;

683

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

743

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

744

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

684

745

}

685

746

if(ret < 0 ){

686

747

int e = errno;

695

756

goto mandos_end;

696

757

}

697

758

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*/

759

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

760

if(IN6_IS_ADDR_LINKLOCAL

761

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

705

762

if(if_index == AVAHI_IF_UNSPEC){

706

763

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

707

764

" incomplete without a network interface\n");

709

766

goto mandos_end;

710

767

}

711

768

/* Set the network interface number as scope */

712

to.in6.sin6_scope_id = (uint32_t)if_index;

769

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

713

770

}

714

771

} else {

715

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

716

-Wconversion and

717

-Wunreachable-code */

772

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

718

773

}

719

774

720

775

if(quit_now){

728

783

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

729

784

perror_plus("if_indextoname");

730

785

} else {

731

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

732

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

786

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

787

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

733

788

}

734

789

} else {

735

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

736

ip, port);

790

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

791

ip, (uintmax_t)port);

737

792

}

738

793

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

794

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

740

const char *pcret;

741

795

if(af == AF_INET6){

742

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

743

sizeof(addrstr));

796

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

797

sizeof(struct sockaddr_in6),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

744

800

} else {

745

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

746

sizeof(addrstr));

801

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

802

sizeof(struct sockaddr_in),

803

addrstr, sizeof(addrstr), NULL, 0,

804

NI_NUMERICHOST);

747

805

}

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

}

806

if(ret == EAI_SYSTEM){

807

perror_plus("getnameinfo");

808

} else if(ret != 0) {

809

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

810

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

811

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

754

812

}

755

813

}

756

814

760

818

}

761

819

762

820

if(af == AF_INET6){

763

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

821

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

822

sizeof(struct sockaddr_in6));

764

823

} else {

765

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

824

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

825

sizeof(struct sockaddr_in));

766

826

}

767

827

if(ret < 0){

768

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

828

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

769

829

int e = errno;

770

830

perror_plus("connect");

771

831

errno = e;

817

877

goto mandos_end;

818

878

}

819

879

820

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

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

880

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

881

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

882

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

883

gnutls_transport_set_ptr(session,

884

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

822

885

823

886

if(quit_now){

824

887

errno = EINTR;

929

992

if(buffer_length > 0){

930

993

ssize_t decrypted_buffer_size;

931

994

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

932

&decrypted_buffer);

995

&decrypted_buffer, mc);

933

996

if(decrypted_buffer_size >= 0){

934

997

935

998

written = 0;

983

1046

return retval;

984

1047

}

985

1048

1049

__attribute__((nonnull))

986

1050

static void resolve_callback(AvahiSServiceResolver *r,

987

1051

AvahiIfIndex interface,

988

1052

AvahiProtocol proto,

996

1060

AVAHI_GCC_UNUSED AvahiStringList *txt,

997

1061

AVAHI_GCC_UNUSED AvahiLookupResultFlags

998

1062

flags,

999

AVAHI_GCC_UNUSED void* userdata){

1000

assert(r);

1063

void *mc){

1064

if(r == NULL){

1065

return;

1066

}

1001

1067

1002

1068

/* Called whenever a service has been resolved successfully or

1003

1069

timed out */

1012

1078

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

1013

1079

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

1014

1080

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_strerror(avahi_server_errno

1082

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

1016

1083

break;

1017

1084

1018

1085

case AVAHI_RESOLVER_FOUND:

1024

1091

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

1025

1092

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

1026

1093

}

1027

int ret = start_mandos_communication(ip, port, interface,

1028

avahi_proto_to_af(proto));

1094

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

1095

interface,

1096

avahi_proto_to_af(proto),

1097

mc);

1029

1098

if(ret == 0){

1030

avahi_simple_poll_quit(mc.simple_poll);

1099

avahi_simple_poll_quit(simple_poll);

1031

1100

} else {

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1101

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

1102

avahi_proto_to_af(proto),

1103

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

1104

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

1105

" list\n", name);

1106

}

1034

1107

}

1035

1108

}

1036

1109

}

1046

1119

const char *domain,

1047

1120

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1048

1121

flags,

1049

AVAHI_GCC_UNUSED void* userdata){

1050

assert(b);

1122

void *mc){

1123

if(b == NULL){

1124

return;

1125

}

1051

1126

1052

1127

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

1053

1128

is removed from the LAN */

1061

1136

case AVAHI_BROWSER_FAILURE:

1062

1137

1063

1138

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1065

avahi_simple_poll_quit(mc.simple_poll);

1139

avahi_strerror(avahi_server_errno

1140

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

1141

avahi_simple_poll_quit(simple_poll);

1066

1142

return;

1067

1143

1068

1144

case AVAHI_BROWSER_NEW:

1071

1147

the callback function is called the Avahi server will free the

1072

1148

resolver for us. */

1073

1149

1074

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

1075

name, type, domain, protocol, 0,

1076

resolve_callback, NULL) == NULL)

1150

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

1151

interface, protocol, name, type,

1152

domain, protocol, 0,

1153

resolve_callback, mc) == NULL)

1077

1154

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

1078

1155

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1156

avahi_strerror(avahi_server_errno

1157

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

1080

1158

break;

1081

1159

1082

1160

case AVAHI_BROWSER_REMOVE:

1101

1179

signal_received = sig;

1102

1180

int old_errno = errno;

1103

1181

/* set main loop to exit */

1104

if(mc.simple_poll != NULL){

1105

avahi_simple_poll_quit(mc.simple_poll);

1182

if(simple_poll != NULL){

1183

avahi_simple_poll_quit(simple_poll);

1106

1184

}

1107

1185

errno = old_errno;

1108

1186

}

1109

1187

1188

__attribute__((nonnull, warn_unused_result))

1110

1189

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

1111

1190

int ret;

1191

error_t ret_errno;

1112

1192

1113

1193

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

1114

1194

if(s < 0){

1195

ret_errno = errno;

1115

1196

perror_plus("socket");

1197

errno = ret_errno;

1116

1198

return false;

1117

1199

}

1118

1200

strcpy(ifr->ifr_name, ifname);

1119

1201

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

1202

if(ret == -1){

1121

1203

if(debug){

1204

ret_errno = errno;

1122

1205

perror_plus("ioctl SIOCGIFFLAGS");

1206

errno = ret_errno;

1123

1207

}

1124

1208

return false;

1125

1209

}

1126

1210

return true;

1127

1211

}

1128

1212

1213

__attribute__((nonnull, warn_unused_result))

1129

1214

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

1130

1215

1131

1216

/* Reject the loopback device */

1173

1258

* corresponds to an acceptable network device.

1174

1259

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

1175

1260

*/

1261

__attribute__((nonnull, warn_unused_result))

1176

1262

int good_interface(const struct dirent *if_entry){

1177

1263

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

1178

1264

return 0;

1194

1280

}

1195

1281

1196

1282

/*

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

1283

* This function determines if a network interface is up.

1284

*/

1285

__attribute__((nonnull, warn_unused_result))

1286

bool interface_is_up(const char *interface){

1287

struct ifreq ifr;

1288

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

1289

if(debug){

1290

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

1291

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

1292

}

1293

return false;

1294

}

1295

1296

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

1297

}

1298

1299

/*

1300

* This function determines if a network interface is running

1301

*/

1302

__attribute__((nonnull, warn_unused_result))

1303

bool interface_is_running(const char *interface){

1304

struct ifreq ifr;

1305

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

1306

if(debug){

1307

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

1308

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

1309

}

1310

return false;

1311

}

1312

1313

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

1314

}

1315

1316

__attribute__((nonnull, pure, warn_unused_result))

1239

1317

int notdotentries(const struct dirent *direntry){

1240

1318

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

1241

1319

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

1248

1326

}

1249

1327

1250

1328

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

1329

__attribute__((nonnull, warn_unused_result))

1251

1330

int runnable_hook(const struct dirent *direntry){

1252

1331

int ret;

1253

1332

size_t sret;

1261

1340

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

1262

1341

"abcdefghijklmnopqrstuvwxyz"

1263

1342

"0123456789"

1264

"_-");

1343

"_.-");

1265

1344

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

1266

1345

/* Contains non-allowed characters */

1267

1346

if(debug){

1271

1350

return 0;

1272

1351

}

1273

1352

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);

1353

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

1282

1354

if(ret == -1){

1283

1355

if(debug){

1284

1356

perror_plus("Could not stat hook");

1301

1373

}

1302

1374

return 0;

1303

1375

}

1376

if(debug){

1377

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

1378

direntry->d_name);

1379

}

1304

1380

return 1;

1305

1381

}

1306

1382

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1383

__attribute__((nonnull, warn_unused_result))

1384

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1385

mandos_context *mc){

1308

1386

int ret;

1309

1387

struct timespec now;

1310

1388

struct timespec waited_time;

1311

1389

intmax_t block_time;

1312

1390

1313

1391

while(true){

1314

if(mc.current_server == NULL){

1315

if (debug){

1392

if(mc->current_server == NULL){

1393

if(debug){

1316

1394

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

1317

1395

" No timeout!\n");

1318

1396

}

1319

1397

ret = avahi_simple_poll_iterate(s, -1);

1320

1398

} else {

1321

if (debug){

1399

if(debug){

1322

1400

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

1323

1401

" it, or wait\n");

1324

1402

}

1331

1409

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

1332

1410

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

1333

1411

waited_time.tv_sec = (now.tv_sec

1334

- mc.current_server->last_seen.tv_sec);

1412

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

1335

1413

waited_time.tv_nsec = (now.tv_nsec

1336

- mc.current_server->last_seen.tv_nsec);

1414

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

1337

1415

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

1338

1416

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

1339

1417

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

1341

1419

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

1342

1420

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

1343

1421

1344

if (debug){

1422

if(debug){

1345

1423

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

1346

1424

block_time);

1347

1425

}

1348

1426

1349

1427

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);

1428

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

1429

mc->current_server->port,

1430

mc->current_server->if_index,

1431

mc->current_server->af, mc);

1354

1432

if(ret == 0){

1355

avahi_simple_poll_quit(mc.simple_poll);

1433

avahi_simple_poll_quit(s);

1356

1434

return 0;

1357

1435

}

1358

1436

ret = clock_gettime(CLOCK_MONOTONIC,

1359

&mc.current_server->last_seen);

1437

&mc->current_server->last_seen);

1360

1438

if(ret == -1){

1361

1439

perror_plus("clock_gettime");

1362

1440

return -1;

1363

1441

}

1364

mc.current_server = mc.current_server->next;

1442

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

1365

1443

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

1366

1444

servers, but don't block */

1367

1445

}

1369

1447

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

1370

1448

}

1371

1449

if(ret != 0){

1372

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

1450

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

1373

1451

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

1374

1452

}

1375

1453

}

1376

1454

}

1377

1455

}

1378

1456

1379

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

1457

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

1458

__attribute__((warn_unused_result))

1459

error_t raise_privileges(void){

1460

error_t old_errno = errno;

1461

error_t ret_errno = 0;

1462

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

1463

ret_errno = errno;

1464

}

1465

errno = old_errno;

1466

return ret_errno;

1467

}

1468

1469

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

1470

__attribute__((warn_unused_result))

1471

error_t raise_privileges_permanently(void){

1472

error_t old_errno = errno;

1473

error_t ret_errno = raise_privileges();

1474

if(ret_errno != 0){

1475

errno = old_errno;

1476

return ret_errno;

1477

}

1478

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

1479

ret_errno = errno;

1480

}

1481

errno = old_errno;

1482

return ret_errno;

1483

}

1484

1485

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

1486

__attribute__((warn_unused_result))

1487

error_t lower_privileges(void){

1488

error_t old_errno = errno;

1489

error_t ret_errno = 0;

1490

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

1491

ret_errno = errno;

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

}

1505

errno = old_errno;

1506

return ret_errno;

1507

}

1508

1509

__attribute__((nonnull))

1510

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

1380

1511

const float delay){

1381

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

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

1385

alphasort);

1512

struct dirent **direntries = NULL;

1513

if(hookdir_fd == -1){

1514

hookdir_fd = open(hookdir, O_RDONLY);

1515

if(hookdir_fd == -1){

1516

if(errno == ENOENT){

1517

if(debug){

1518

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

1519

" found\n", hookdir);

1520

}

1521

} else {

1522

perror_plus("open");

1523

}

1524

return;

1525

}

1526

}

1527

#ifdef __GLIBC__

1528

#if __GLIBC_PREREQ(2, 15)

1529

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

1530

runnable_hook, alphasort);

1531

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

1532

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

1533

alphasort);

1534

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

1535

#else /* not __GLIBC__ */

1536

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

1537

alphasort);

1538

#endif /* not __GLIBC__ */

1386

1539

if(numhooks == -1){

1387

1540

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){

1541

return;

1542

}

1543

struct dirent *direntry;

1544

int ret;

1545

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

1546

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

1547

direntry = direntries[i];

1548

if(debug){

1549

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

1550

direntry->d_name);

1551

}

1552

pid_t hook_pid = fork();

1553

if(hook_pid == 0){

1554

/* Child */

1555

/* Raise privileges */

1556

errno = raise_privileges_permanently();

1557

if(errno != 0){

1558

perror_plus("Failed to raise privileges");

1559

_exit(EX_NOPERM);

1560

}

1561

/* Set group */

1562

errno = 0;

1563

ret = setgid(0);

1564

if(ret == -1){

1565

perror_plus("setgid");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Reset supplementary groups */

1569

errno = 0;

1570

ret = setgroups(0, NULL);

1571

if(ret == -1){

1572

perror_plus("setgroups");

1573

_exit(EX_NOPERM);

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

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

1591

if(ret == -1){

1592

perror_plus("setenv");

1593

_exit(EX_OSERR);

1594

}

1595

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

1596

if(ret == -1){

1597

perror_plus("setenv");

1598

_exit(EX_OSERR);

1599

}

1600

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

1601

if(ret == -1){

1602

perror_plus("setenv");

1603

_exit(EX_OSERR);

1604

}

1605

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

1606

if(ret == -1){

1607

perror_plus("setenv");

1608

_exit(EX_OSERR);

1609

}

1610

char *delaystring;

1611

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

1612

if(ret == -1){

1395

1613

perror_plus("asprintf");

1396

continue;

1614

_exit(EX_OSERR);

1397

1615

}

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

}

1616

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

1617

if(ret == -1){

1436

1618

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;

1619

perror_plus("setenv");

1620

_exit(EX_OSERR);

1621

}

1622

free(delaystring);

1623

if(connect_to != NULL){

1624

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

1625

if(ret == -1){

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

}

1630

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

1631

if(hook_fd == -1){

1632

perror_plus("openat");

1633

_exit(EXIT_FAILURE);

1634

}

1635

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

1636

perror_plus("close");

1637

_exit(EXIT_FAILURE);

1638

}

1639

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

1640

environ) == -1){

1641

perror_plus("fexecve");

1642

_exit(EXIT_FAILURE);

1643

}

1644

} else {

1645

int status;

1646

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

1647

perror_plus("waitpid");

1648

continue;

1649

}

1650

if(WIFEXITED(status)){

1651

if(WEXITSTATUS(status) != 0){

1652

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

1653

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

1654

WEXITSTATUS(status));

1655

continue;

1656

}

1657

} else if(WIFSIGNALED(status)){

1658

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

1659

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

1660

WTERMSIG(status));

1661

continue;

1662

} else {

1663

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

1664

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

1665

continue;

1666

}

1667

}

1668

if(debug){

1669

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

1670

direntry->d_name);

1671

}

1672

}

1673

free(direntries);

1674

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

1675

perror_plus("close");

1676

} else {

1677

hookdir_fd = -1;

1678

}

1679

close(devnull);

1680

}

1681

1682

__attribute__((nonnull, warn_unused_result))

1683

error_t bring_up_interface(const char *const interface,

1684

const float delay){

1685

error_t old_errno = errno;

1686

int ret;

1687

struct ifreq network;

1688

unsigned int if_index = if_nametoindex(interface);

1689

if(if_index == 0){

1690

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

1691

errno = old_errno;

1692

return ENXIO;

1693

}

1694

1695

if(quit_now){

1696

errno = old_errno;

1697

return EINTR;

1698

}

1699

1700

if(not interface_is_up(interface)){

1701

error_t ret_errno = 0, ioctl_errno = 0;

1702

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

1703

ret_errno = errno;

1704

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

1705

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

1706

errno = old_errno;

1707

return ret_errno;

1708

}

1709

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

1710

1711

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

1712

if(sd == -1){

1713

ret_errno = errno;

1714

perror_plus("socket");

1715

errno = old_errno;

1716

return ret_errno;

1717

}

1718

1719

if(quit_now){

1720

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

1721

if(ret == -1){

1722

perror_plus("close");

1723

}

1724

errno = old_errno;

1725

return EINTR;

1726

}

1727

1728

if(debug){

1729

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

1730

interface);

1731

}

1732

1733

/* Raise privileges */

1734

ret_errno = raise_privileges();

1735

if(ret_errno != 0){

1736

errno = ret_errno;

1737

perror_plus("Failed to raise privileges");

1738

}

1739

1740

#ifdef __linux__

1741

int ret_linux;

1742

bool restore_loglevel = false;

1743

if(ret_errno == 0){

1744

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1745

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

1746

ret_linux = klogctl(8, NULL, 5);

1747

if(ret_linux == -1){

1748

perror_plus("klogctl");

1749

} else {

1750

restore_loglevel = true;

1751

}

1752

}

1753

#endif /* __linux__ */

1754

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

1755

ioctl_errno = errno;

1756

#ifdef __linux__

1757

if(restore_loglevel){

1758

ret_linux = klogctl(7, NULL, 0);

1759

if(ret_linux == -1){

1760

perror_plus("klogctl");

1761

}

1762

}

1763

#endif /* __linux__ */

1764

1765

/* If raise_privileges() succeeded above */

1766

if(ret_errno == 0){

1767

/* Lower privileges */

1768

ret_errno = lower_privileges();

1769

if(ret_errno != 0){

1770

errno = ret_errno;

1771

perror_plus("Failed to lower privileges");

1772

}

1773

}

1774

1775

/* Close the socket */

1776

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

1777

if(ret == -1){

1778

perror_plus("close");

1779

}

1780

1781

if(ret_setflags == -1){

1782

errno = ioctl_errno;

1783

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1784

errno = old_errno;

1785

return ioctl_errno;

1786

}

1787

} else if(debug){

1788

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

1789

interface);

1790

}

1791

1792

/* Sleep checking until interface is running.

1793

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

1794

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

1795

if(interface_is_running(interface)){

1796

break;

1797

}

1798

struct timespec sleeptime = { .tv_nsec = 250000000 };

1799

ret = nanosleep(&sleeptime, NULL);

1800

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

1801

perror_plus("nanosleep");

1802

}

1803

}

1804

1805

errno = old_errno;

1806

return 0;

1807

}

1808

1809

__attribute__((nonnull, warn_unused_result))

1810

error_t take_down_interface(const char *const interface){

1811

error_t old_errno = errno;

1812

struct ifreq network;

1813

unsigned int if_index = if_nametoindex(interface);

1814

if(if_index == 0){

1815

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

1816

errno = old_errno;

1817

return ENXIO;

1818

}

1819

if(interface_is_up(interface)){

1820

error_t ret_errno = 0, ioctl_errno = 0;

1821

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

1822

ret_errno = errno;

1823

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

1824

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

1825

errno = old_errno;

1826

return ret_errno;

1827

}

1828

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

1829

1830

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

1831

if(sd == -1){

1832

ret_errno = errno;

1833

perror_plus("socket");

1834

errno = old_errno;

1835

return ret_errno;

1836

}

1837

1838

if(debug){

1839

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

1840

interface);

1841

}

1842

1843

/* Raise privileges */

1844

ret_errno = raise_privileges();

1845

if(ret_errno != 0){

1846

errno = ret_errno;

1847

perror_plus("Failed to raise privileges");

1848

}

1849

1850

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

1851

ioctl_errno = errno;

1852

1853

/* If raise_privileges() succeeded above */

1854

if(ret_errno == 0){

1855

/* Lower privileges */

1856

ret_errno = lower_privileges();

1857

if(ret_errno != 0){

1858

errno = ret_errno;

1859

perror_plus("Failed to lower privileges");

1860

}

1861

}

1862

1863

/* Close the socket */

1864

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

1865

if(ret == -1){

1866

perror_plus("close");

1867

}

1868

1869

if(ret_setflags == -1){

1870

errno = ioctl_errno;

1871

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1872

errno = old_errno;

1873

return ioctl_errno;

1874

}

1875

} else if(debug){

1876

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

1877

interface);

1878

}

1879

1880

errno = old_errno;

1881

return 0;

1475

1882

}

1476

1883

1477

1884

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

1885

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

1886

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

1887

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

1888

.interfaces = NULL, .interfaces_size = 0 };

1478

1889

AvahiSServiceBrowser *sb = NULL;

1479

int error;

1890

error_t ret_errno;

1480

1891

int ret;

1481

1892

intmax_t tmpmax;

1482

1893

char *tmp;

1483

1894

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;

1895

char *interfaces_to_take_down = NULL;

1896

size_t interfaces_to_take_down_size = 0;

1897

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

1898

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

1899

char *tempdir = NULL;

1492

1900

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1493

1901

const char *seckey = PATHDIR "/" SECKEY;

1494

1902

const char *pubkey = PATHDIR "/" PUBKEY;

1903

char *interfaces_hooks = NULL;

1495

1904

1496

1905

bool gnutls_initialized = false;

1497

1906

bool gpgme_initialized = false;

1559

1968

.group = 2 },

1560

1969

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

1561

1970

.arg = "SECONDS",

1562

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

1971

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

1563

1972

.group = 2 },

1564

1973

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

1565

1974

.arg = "DIR",

1588

1997

connect_to = arg;

1589

1998

break;

1590

1999

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

1591

interface = arg;

2000

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

2001

arg, (int)',');

2002

if(ret_errno != 0){

2003

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

2004

}

1592

2005

break;

1593

2006

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

1594

2007

seckey = arg;

1637

2050

argp_state_help(state, state->out_stream,

1638

2051

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1639

2052

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

1642

2053

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

1643

2054

exit(argp_err_exit_status);

1644

2055

break;

1672

2083

{

1673

2084

/* Work around Debian bug #633582:

1674

2085

<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");

2086

2087

/* Re-raise privileges */

2088

ret_errno = raise_privileges();

2089

if(ret_errno != 0){

2090

errno = ret_errno;

2091

perror_plus("Failed to raise privileges");

2092

} else {

2093

struct stat st;

2094

2095

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

2096

int seckey_fd = open(seckey, O_RDONLY);

2097

if(seckey_fd == -1){

2098

perror_plus("open");

2099

} else {

2100

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

2101

if(ret == -1){

2102

perror_plus("fstat");

2103

} else {

2104

if(S_ISREG(st.st_mode)

2105

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

2106

ret = fchown(seckey_fd, uid, gid);

2107

if(ret == -1){

2108

perror_plus("fchown");

2109

}

2110

}

2111

}

2112

TEMP_FAILURE_RETRY(close(seckey_fd));

2113

}

2114

}

2115

2116

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

2117

int pubkey_fd = open(pubkey, O_RDONLY);

2118

if(pubkey_fd == -1){

2119

perror_plus("open");

2120

} else {

2121

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

2122

if(ret == -1){

2123

perror_plus("fstat");

2124

} else {

2125

if(S_ISREG(st.st_mode)

2126

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

2127

ret = fchown(pubkey_fd, uid, gid);

2128

if(ret == -1){

2129

perror_plus("fchown");

2130

}

2131

}

2132

}

2133

TEMP_FAILURE_RETRY(close(pubkey_fd));

2134

}

2135

}

2136

2137

/* Lower privileges */

2138

ret_errno = lower_privileges();

2139

if(ret_errno != 0){

2140

errno = ret_errno;

2141

perror_plus("Failed to lower privileges");

2142

}

2143

}

2144

}

2145

2146

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

2147

{

2148

char *interface = NULL;

2149

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

2150

interface))){

2151

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

2152

and if_nametoindex(interface) == 0){

2153

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

2154

fprintf_plus(stderr, "Not using nonexisting interface"

2155

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

2156

}

2157

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

2158

interface = NULL;

2159

}

1731

2160

}

1732

2161

}

1733

2162

1734

2163

/* Run network hooks */

1735

2164

{

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

}

2165

if(mc.interfaces != NULL){

2166

interfaces_hooks = malloc(mc.interfaces_size);

2167

if(interfaces_hooks == NULL){

2168

perror_plus("malloc");

2169

goto end;

2170

}

2171

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

2172

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

2173

}

2174

run_network_hooks("start", interfaces_hooks != NULL ?

2175

interfaces_hooks : "", delay);

1751

2176

}

1752

2177

1753

2178

if(not debug){

1754

2179

avahi_set_log_function(empty_log);

1755

2180

}

1756

2181

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

2182

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

1790

2183

from the signal handler */

1791

2184

/* Initialize the pseudo-RNG for Avahi */

1792

2185

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

1793

mc.simple_poll = avahi_simple_poll_new();

1794

if(mc.simple_poll == NULL){

2186

simple_poll = avahi_simple_poll_new();

2187

if(simple_poll == NULL){

1795

2188

fprintf_plus(stderr,

1796

2189

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

1797

2190

exitcode = EX_UNAVAILABLE;

1861

2254

}

1862

2255

}

1863

2256

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");

2257

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

2258

if(mc.interfaces == NULL){

2259

struct dirent **direntries = NULL;

2260

/* Look for any good interfaces */

2261

ret = scandir(sys_class_net, &direntries, good_interface,

2262

alphasort);

2263

if(ret >= 1){

2264

/* Add all found interfaces to interfaces list */

2265

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

2266

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

2267

direntries[i]->d_name);

2268

if(ret_errno != 0){

2269

errno = ret_errno;

2270

perror_plus("argz_add");

2271

continue;

2272

}

2273

if(debug){

2274

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

2275

direntries[i]->d_name);

2276

}

2277

}

2278

free(direntries);

2279

} else {

2280

if(ret == 0){

2281

free(direntries);

2282

}

2283

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

2284

exitcode = EXIT_FAILURE;

2285

goto end;

2286

}

2287

}

2288

2289

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

2290

{

2291

char *interface = NULL;

2292

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

2293

interface))){

2294

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

2295

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

2296

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

2297

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

2298

interface);

2299

interface = NULL;

2300

while((interface = argz_next(mc.interfaces,

2301

mc.interfaces_size, interface))){

2302

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

2303

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

2304

interface);

2305

interface = NULL;

1949

2306

}

1950

2307

}

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

2308

break;

1969

2309

}

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

}

2310

bool interface_was_up = interface_is_up(interface);

2311

errno = bring_up_interface(interface, delay);

2312

if(not interface_was_up){

2313

if(errno != 0){

2314

perror_plus("Failed to bring up interface");

2315

} else {

2316

errno = argz_add(&interfaces_to_take_down,

2317

&interfaces_to_take_down_size,

2318

interface);

2319

if(errno != 0){

2320

perror_plus("argz_add");

2321

}

2322

}

2323

}

2324

}

2325

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

2326

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

2327

}

2328

}

2329

2330

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

2331

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

2332

if(debug){

2333

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

2334

mc.interfaces);

2335

}

2336

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

1999

2337

}

2000

2338

2001

2339

if(quit_now){

2002

2340

goto end;

2003

2341

}

2004

2342

2005

ret = init_gnutls_global(pubkey, seckey);

2343

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

2006

2344

if(ret == -1){

2007

2345

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

2008

2346

exitcode = EX_UNAVAILABLE;

2015

2353

goto end;

2016

2354

}

2017

2355

2018

if(mkdtemp(tempdir) == NULL){

2356

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

2357

tempdir = mkdtemp(run_tempdir);

2358

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

2359

if(debug){

2360

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

2361

run_tempdir, old_tempdir);

2362

}

2363

tempdir = mkdtemp(old_tempdir);

2364

}

2365

if(tempdir == NULL){

2019

2366

perror_plus("mkdtemp");

2020

2367

goto end;

2021

2368

}

2022

tempdir_created = true;

2023

2369

2024

2370

if(quit_now){

2025

2371

goto end;

2026

2372

}

2027

2373

2028

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

2374

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

2029

2375

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

2030

2376

exitcode = EX_UNAVAILABLE;

2031

2377

goto end;

2041

2387

/* Connect directly, do not use Zeroconf */

2042

2388

/* (Mainly meant for debugging) */

2043

2389

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

2390

2044

2391

if(address == NULL){

2045

2392

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

2046

2393

exitcode = EX_USAGE;

2051

2398

goto end;

2052

2399

}

2053

2400

2054

uint16_t port;

2401

in_port_t port;

2055

2402

errno = 0;

2056

2403

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

2057

2404

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

2058

or tmpmax != (uint16_t)tmpmax){

2405

or tmpmax != (in_port_t)tmpmax){

2059

2406

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

2060

2407

exitcode = EX_USAGE;

2061

2408

goto end;

2062

2409

}

2063

2410

2064

2411

if(quit_now){

2065

2412

goto end;

2066

2413

}

2067

2414

2068

port = (uint16_t)tmpmax;

2415

port = (in_port_t)tmpmax;

2069

2416

*address = '\0';

2070

2417

/* Colon in address indicates IPv6 */

2071

2418

int af;

2087

2434

}

2088

2435

2089

2436

while(not quit_now){

2090

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

2437

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

2438

&mc);

2091

2439

if(quit_now or ret == 0){

2092

2440

break;

2093

2441

}

2095

2443

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

2096

2444

(int)retry_interval);

2097

2445

}

2098

sleep((int)retry_interval);

2446

sleep((unsigned int)retry_interval);

2099

2447

}

2100

2448

2101

if (not quit_now){

2449

if(not quit_now){

2102

2450

exitcode = EXIT_SUCCESS;

2103

2451

}

2104

2452

2119

2467

config.publish_domain = 0;

2120

2468

2121

2469

/* Allocate a new server */

2122

mc.server = avahi_server_new(avahi_simple_poll_get

2123

(mc.simple_poll), &config, NULL,

2124

NULL, &error);

2470

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2471

&config, NULL, NULL, &ret_errno);

2125

2472

2126

2473

/* Free the Avahi configuration data */

2127

2474

avahi_server_config_free(&config);

2130

2477

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

2131

2478

if(mc.server == NULL){

2132

2479

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

2133

avahi_strerror(error));

2480

avahi_strerror(ret_errno));

2134

2481

exitcode = EX_UNAVAILABLE;

2135

2482

goto end;

2136

2483

}

2142

2489

/* Create the Avahi service browser */

2143

2490

sb = avahi_s_service_browser_new(mc.server, if_index,

2144

2491

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2145

NULL, 0, browse_callback, NULL);

2492

NULL, 0, browse_callback,

2493

(void *)&mc);

2146

2494

if(sb == NULL){

2147

2495

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

2148

2496

avahi_strerror(avahi_server_errno(mc.server)));

2159

2507

if(debug){

2160

2508

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

2161

2509

}

2162

2163

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

(int)(retry_interval * 1000));

2510

2511

ret = avahi_loop_with_timeout(simple_poll,

2512

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

2165

2513

if(debug){

2166

2514

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

2167

2515

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

2174

2522

}

2175

2523

2176

2524

/* Cleanup things */

2525

free(mc.interfaces);

2526

2177

2527

if(sb != NULL)

2178

2528

avahi_s_service_browser_free(sb);

2179

2529

2180

2530

if(mc.server != NULL)

2181

2531

avahi_server_free(mc.server);

2182

2532

2183

if(mc.simple_poll != NULL)

2184

avahi_simple_poll_free(mc.simple_poll);

2533

if(simple_poll != NULL)

2534

avahi_simple_poll_free(simple_poll);

2185

2535

2186

2536

if(gnutls_initialized){

2187

2537

gnutls_certificate_free_credentials(mc.cred);

2192

2542

if(gpgme_initialized){

2193

2543

gpgme_release(mc.ctx);

2194

2544

}

2195

2545

2196

2546

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

2197

2547

has seen */

2198

2548

if(mc.current_server != NULL){

2204

2554

}

2205

2555

}

2206

2556

2207

/* Re-raise priviliges */

2557

/* Re-raise privileges */

2208

2558

{

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;

2559

ret_errno = raise_privileges();

2560

if(ret_errno != 0){

2561

errno = ret_errno;

2562

perror_plus("Failed to raise privileges");

2563

} else {

2564

2565

/* Run network hooks */

2566

run_network_hooks("stop", interfaces_hooks != NULL ?

2567

interfaces_hooks : "", delay);

2568

2569

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

2570

{

2571

char *interface = NULL;

2572

while((interface=argz_next(interfaces_to_take_down,

2573

interfaces_to_take_down_size,

2574

interface))){

2575

ret_errno = take_down_interface(interface);

2576

if(ret_errno != 0){

2577

errno = ret_errno;

2578

perror_plus("Failed to take down interface");

2579

}

2580

}

2581

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

2582

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

2583

" down\n");

2584

}

2585

}

2217

2586

}

2218

2587

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

}

2588

ret_errno = lower_privileges_permanently();

2589

if(ret_errno != 0){

2590

errno = ret_errno;

2591

perror_plus("Failed to lower privileges permanently");

2235

2592

}

2236

2593

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2594

2595

free(interfaces_to_take_down);

2596

free(interfaces_hooks);

2243

2597

2244

2598

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

2245

if(tempdir_created){

2599

if(tempdir != NULL){

2246

2600

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);

2601

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

2602

O_NOFOLLOW));

2603

if(tempdir_fd == -1){

2604

perror_plus("open");

2605

} else {

2606

#ifdef __GLIBC__

2607

#if __GLIBC_PREREQ(2, 15)

2608

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

2609

notdotentries, alphasort);

2610

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

2611

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

2612

alphasort);

2613

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

2614

#else /* not __GLIBC__ */

2615

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

2616

alphasort);

2617

#endif /* not __GLIBC__ */

2618

if(numentries >= 0){

2619

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

2620

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

2621

if(ret == -1){

2622

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

2623

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

2624

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

2625

}

2626

}

2627

2628

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

2629

free(direntries);

2630

if(numentries == -1){

2631

perror_plus("scandir");

2632

}

2633

ret = rmdir(tempdir);

2634

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

2635

perror_plus("rmdir");

2636

}

2266

2637

}

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");

2638

TEMP_FAILURE_RETRY(close(tempdir_fd));

2277

2639

}

2278

2640

}

2279

2641