/mandos/trunk : revision 505.3.2

85

raise() */

86

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

88

91

89

#ifdef __linux__

92

90

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

110

108

init_gnutls_session(),

111

109

GNUTLS_* */

112

110

#include <gnutls/openpgp.h>

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

115

113

116

114

/* GPGME */

117

115

#include <gpgme.h> /* All GPGME types, constants and

133

131

const char *argp_program_bug_address = "<mandos@recompile.se>";

134

132

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

135

133

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

134

138

135

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

139

136

typedef struct server{

174

171

perror(print_text);

175

172

}

176

173

177

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

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

183

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

184

}

185

186

174

/*

187

175

* Make additional room in "buffer" for at least BUFFER_SIZE more

188

176

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

189

177

* "buffer_length" is how much is already used.

190

178

*/

191

179

size_t incbuffer(char **buffer, size_t buffer_length,

192

size_t buffer_capacity){

180

size_t buffer_capacity){

193

181

if(buffer_length + BUFFER_SIZE > buffer_capacity){

194

182

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

195

183

if(buffer == NULL){

201

189

}

202

190

203

191

/* 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){

192

int add_server(const char *ip, uint16_t port,

193

AvahiIfIndex if_index,

194

int af){

206

195

int ret;

207

196

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

208

197

if(new_server == NULL){

210

199

return -1;

211

200

}

212

201

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

213

.port = port,

214

.if_index = if_index,

215

.af = af };

202

.port = port,

203

.if_index = if_index,

204

.af = af };

216

205

if(new_server->ip == NULL){

217

206

perror_plus("strdup");

218

207

return -1;

240

229

/*

241

230

* Initialize GPGME.

242

231

*/

243

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

244

const char *tempdir){

232

static bool init_gpgme(const char *seckey,

233

const char *pubkey, const char *tempdir){

245

234

gpgme_error_t rc;

246

235

gpgme_engine_info_t engine_info;

247

236

262

251

263

252

rc = gpgme_data_new_from_fd(&pgp_data, fd);

264

253

if(rc != GPG_ERR_NO_ERROR){

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

254

fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",

255

gpgme_strsource(rc), gpgme_strerror(rc));

267

256

return false;

268

257

}

269

258

270

259

rc = gpgme_op_import(mc.ctx, pgp_data);

271

260

if(rc != GPG_ERR_NO_ERROR){

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

261

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

262

gpgme_strsource(rc), gpgme_strerror(rc));

274

263

return false;

275

264

}

276

265

283

272

}

284

273

285

274

if(debug){

286

fprintf_plus(stderr, "Initializing GPGME\n");

275

fprintf(stderr, "Initializing GPGME\n");

287

276

}

288

277

289

278

/* Init GPGME */

290

279

gpgme_check_version(NULL);

291

280

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

292

281

if(rc != GPG_ERR_NO_ERROR){

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

282

fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",

283

gpgme_strsource(rc), gpgme_strerror(rc));

295

284

return false;

296

285

}

297

286

298

287

/* Set GPGME home directory for the OpenPGP engine only */

299

288

rc = gpgme_get_engine_info(&engine_info);

300

289

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

290

fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",

291

gpgme_strsource(rc), gpgme_strerror(rc));

303

292

return false;

304

293

}

305

294

while(engine_info != NULL){

311

300

engine_info = engine_info->next;

312

301

}

313

302

if(engine_info == NULL){

314

fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",

315

tempdir);

303

fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);

316

304

return false;

317

305

}

318

306

319

307

/* Create new GPGME "context" */

320

308

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

321

309

if(rc != GPG_ERR_NO_ERROR){

322

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

323

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

324

gpgme_strerror(rc));

310

fprintf(stderr, "bad gpgme_new: %s: %s\n",

311

gpgme_strsource(rc), gpgme_strerror(rc));

325

312

return false;

326

313

}

327

314

346

333

ssize_t plaintext_length = 0;

347

334

348

335

if(debug){

349

fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");

336

fprintf(stderr, "Trying to decrypt OpenPGP data\n");

350

337

}

351

338

352

339

/* Create new GPGME data buffer from memory cryptotext */

353

340

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

354

341

0);

355

342

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

343

fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",

344

gpgme_strsource(rc), gpgme_strerror(rc));

358

345

return -1;

359

346

}

360

347

361

348

/* Create new empty GPGME data buffer for the plaintext */

362

349

rc = gpgme_data_new(&dh_plain);

363

350

if(rc != GPG_ERR_NO_ERROR){

364

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

365

"bad gpgme_data_new: %s: %s\n",

366

gpgme_strsource(rc), gpgme_strerror(rc));

351

fprintf(stderr, "bad gpgme_data_new: %s: %s\n",

352

gpgme_strsource(rc), gpgme_strerror(rc));

367

353

gpgme_data_release(dh_crypto);

368

354

return -1;

369

355

}

372

358

data buffer */

373

359

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

374

360

if(rc != GPG_ERR_NO_ERROR){

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

361

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

362

gpgme_strsource(rc), gpgme_strerror(rc));

377

363

plaintext_length = -1;

378

364

if(debug){

379

365

gpgme_decrypt_result_t result;

380

366

result = gpgme_op_decrypt_result(mc.ctx);

381

367

if(result == NULL){

382

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

368

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

383

369

} else {

384

fprintf_plus(stderr, "Unsupported algorithm: %s\n",

385

result->unsupported_algorithm);

386

fprintf_plus(stderr, "Wrong key usage: %u\n",

387

result->wrong_key_usage);

370

fprintf(stderr, "Unsupported algorithm: %s\n",

371

result->unsupported_algorithm);

372

fprintf(stderr, "Wrong key usage: %u\n",

373

result->wrong_key_usage);

388

374

if(result->file_name != NULL){

389

fprintf_plus(stderr, "File name: %s\n", result->file_name);

375

fprintf(stderr, "File name: %s\n", result->file_name);

390

376

}

391

377

gpgme_recipient_t recipient;

392

378

recipient = result->recipients;

393

379

while(recipient != NULL){

394

fprintf_plus(stderr, "Public key algorithm: %s\n",

395

gpgme_pubkey_algo_name

396

(recipient->pubkey_algo));

397

fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);

398

fprintf_plus(stderr, "Secret key available: %s\n",

399

recipient->status == GPG_ERR_NO_SECKEY

400

? "No" : "Yes");

380

fprintf(stderr, "Public key algorithm: %s\n",

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

383

fprintf(stderr, "Secret key available: %s\n",

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "No" : "Yes");

401

386

recipient = recipient->next;

402

387

}

403

388

}

406

391

}

407

392

408

393

if(debug){

409

fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");

394

fprintf(stderr, "Decryption of OpenPGP data succeeded\n");

410

395

}

411

396

412

397

/* Seek back to the beginning of the GPGME plaintext data buffer */

419

404

*plaintext = NULL;

420

405

while(true){

421

406

plaintext_capacity = incbuffer(plaintext,

422

(size_t)plaintext_length,

423

plaintext_capacity);

407

(size_t)plaintext_length,

408

plaintext_capacity);

424

409

if(plaintext_capacity == 0){

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

428

413

}

429

414

430

415

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

443

428

}

444

429

445

430

if(debug){

446

fprintf_plus(stderr, "Decrypted password is: ");

431

fprintf(stderr, "Decrypted password is: ");

447

432

for(ssize_t i = 0; i < plaintext_length; i++){

448

433

fprintf(stderr, "%02hhX ", (*plaintext)[i]);

449

434

}

471

456

/* GnuTLS log function callback */

472

457

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

473

458

const char* string){

474

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

459

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

475

460

}

476

461

477

462

static int init_gnutls_global(const char *pubkeyfilename,

479

464

int ret;

480

465

481

466

if(debug){

482

fprintf_plus(stderr, "Initializing GnuTLS\n");

467

fprintf(stderr, "Initializing GnuTLS\n");

483

468

}

484

469

485

470

ret = gnutls_global_init();

486

471

if(ret != GNUTLS_E_SUCCESS){

487

fprintf_plus(stderr, "GnuTLS global_init: %s\n",

488

safer_gnutls_strerror(ret));

472

fprintf(stderr, "GnuTLS global_init: %s\n",

473

safer_gnutls_strerror(ret));

489

474

return -1;

490

475

}

491

476

500

485

/* OpenPGP credentials */

501

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

502

487

if(ret != GNUTLS_E_SUCCESS){

503

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

504

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

505

490

gnutls_global_deinit();

506

491

return -1;

507

492

}

508

493

509

494

if(debug){

510

fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"

511

" secret key %s as GnuTLS credentials\n",

512

pubkeyfilename,

513

seckeyfilename);

495

fprintf(stderr, "Attempting to use OpenPGP public key %s and"

496

" secret key %s as GnuTLS credentials\n", pubkeyfilename,

497

seckeyfilename);

514

498

}

515

499

516

500

ret = gnutls_certificate_set_openpgp_key_file

517

501

(mc.cred, pubkeyfilename, seckeyfilename,

518

502

GNUTLS_OPENPGP_FMT_BASE64);

519

503

if(ret != GNUTLS_E_SUCCESS){

520

fprintf_plus(stderr,

521

"Error[%d] while reading the OpenPGP key pair ('%s',"

522

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

523

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

524

safer_gnutls_strerror(ret));

504

fprintf(stderr,

505

"Error[%d] while reading the OpenPGP key pair ('%s',"

506

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

507

fprintf(stderr, "The GnuTLS error is: %s\n",

508

safer_gnutls_strerror(ret));

525

509

goto globalfail;

526

510

}

527

511

528

512

/* GnuTLS server initialization */

529

513

ret = gnutls_dh_params_init(&mc.dh_params);

530

514

if(ret != GNUTLS_E_SUCCESS){

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

515

fprintf(stderr, "Error in GnuTLS DH parameter initialization:"

516

" %s\n", safer_gnutls_strerror(ret));

534

517

goto globalfail;

535

518

}

536

519

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

537

520

if(ret != GNUTLS_E_SUCCESS){

538

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

539

safer_gnutls_strerror(ret));

521

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

522

safer_gnutls_strerror(ret));

540

523

goto globalfail;

541

524

}

542

525

562

545

}

563

546

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

564

547

if(ret != GNUTLS_E_SUCCESS){

565

fprintf_plus(stderr,

566

"Error in GnuTLS session initialization: %s\n",

567

safer_gnutls_strerror(ret));

548

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

549

safer_gnutls_strerror(ret));

568

550

}

569

551

570

552

{

577

559

}

578

560

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

579

561

if(ret != GNUTLS_E_SUCCESS){

580

fprintf_plus(stderr, "Syntax error at: %s\n", err);

581

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

582

safer_gnutls_strerror(ret));

562

fprintf(stderr, "Syntax error at: %s\n", err);

563

fprintf(stderr, "GnuTLS error: %s\n",

564

safer_gnutls_strerror(ret));

583

565

gnutls_deinit(*session);

584

566

return -1;

585

567

}

594

576

}

595

577

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

596

578

if(ret != GNUTLS_E_SUCCESS){

597

fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",

598

safer_gnutls_strerror(ret));

579

fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

580

safer_gnutls_strerror(ret));

599

581

gnutls_deinit(*session);

600

582

return -1;

601

583

}

646

628

pf = PF_INET;

647

629

break;

648

630

default:

649

fprintf_plus(stderr, "Bad address family: %d\n", af);

631

fprintf(stderr, "Bad address family: %d\n", af);

650

632

errno = EINVAL;

651

633

return -1;

652

634

}

657

639

}

658

640

659

641

if(debug){

660

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

661

PRIu16 "\n", ip, port);

642

fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16

643

"\n", ip, port);

662

644

}

663

645

664

646

tcp_sd = socket(pf, SOCK_STREAM, 0);

690

672

}

691

673

if(ret == 0){

692

674

int e = errno;

693

fprintf_plus(stderr, "Bad address: %s\n", ip);

675

fprintf(stderr, "Bad address: %s\n", ip);

694

676

errno = e;

695

677

goto mandos_end;

696

678

}

701

683

702

684

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

685

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

704

-Wunreachable-code*/

686

-Wunreachable-code*/

705

687

if(if_index == AVAHI_IF_UNSPEC){

706

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

707

" incomplete without a network interface\n");

688

fprintf(stderr, "An IPv6 link-local address is incomplete"

689

" without a network interface\n");

708

690

errno = EINVAL;

709

691

goto mandos_end;

710

692

}

728

710

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

729

711

perror_plus("if_indextoname");

730

712

} else {

731

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

732

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

713

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

714

ip, interface, port);

733

715

}

734

716

} else {

735

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

736

ip, port);

717

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

718

port);

737

719

}

738

720

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

721

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

749

731

perror_plus("inet_ntop");

750

732

} else {

751

733

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

752

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

734

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

753

735

}

754

736

}

755

737

}

783

765

while(true){

784

766

size_t out_size = strlen(out);

785

767

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

786

out_size - written));

768

out_size - written));

787

769

if(ret == -1){

788

770

int e = errno;

789

771

perror_plus("write");

809

791

}

810

792

811

793

if(debug){

812

fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);

794

fprintf(stderr, "Establishing TLS session with %s\n", ip);

813

795

}

814

796

815

797

if(quit_now){

835

817

836

818

if(ret != GNUTLS_E_SUCCESS){

837

819

if(debug){

838

fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");

820

fprintf(stderr, "*** GnuTLS Handshake failed ***\n");

839

821

gnutls_perror(ret);

840

822

}

841

823

errno = EPROTO;

845

827

/* Read OpenPGP packet that contains the wanted password */

846

828

847

829

if(debug){

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

830

fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",

831

ip);

850

832

}

851

833

852

834

while(true){

857

839

}

858

840

859

841

buffer_capacity = incbuffer(&buffer, buffer_length,

860

buffer_capacity);

842

buffer_capacity);

861

843

if(buffer_capacity == 0){

862

844

int e = errno;

863

845

perror_plus("incbuffer");

890

872

}

891

873

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

892

874

if(ret < 0){

893

fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "

894

"***\n");

875

fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

895

876

gnutls_perror(ret);

896

877

errno = EPROTO;

897

878

goto mandos_end;

898

879

}

899

880

break;

900

881

default:

901

fprintf_plus(stderr, "Unknown error while reading data from"

902

" encrypted session with Mandos server\n");

882

fprintf(stderr, "Unknown error while reading data from"

883

" encrypted session with Mandos server\n");

903

884

gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

885

errno = EIO;

905

886

goto mandos_end;

910

891

}

911

892

912

893

if(debug){

913

fprintf_plus(stderr, "Closing TLS session\n");

894

fprintf(stderr, "Closing TLS session\n");

914

895

}

915

896

916

897

if(quit_now){

928

909

929

910

if(buffer_length > 0){

930

911

ssize_t decrypted_buffer_size;

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

932

914

&decrypted_buffer);

933

915

if(decrypted_buffer_size >= 0){

934

916

945

927

if(ret == 0 and ferror(stdout)){

946

928

int e = errno;

947

929

if(debug){

948

fprintf_plus(stderr, "Error writing encrypted data: %s\n",

949

strerror(errno));

930

fprintf(stderr, "Error writing encrypted data: %s\n",

931

strerror(errno));

950

932

}

951

933

errno = e;

952

934

goto mandos_end;

1009

991

switch(event){

1010

992

default:

1011

993

case AVAHI_RESOLVER_FAILURE:

1012

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

1013

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

1014

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

994

fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"

995

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

996

avahi_strerror(avahi_server_errno(mc.server)));

1016

997

break;

1017

998

1018

999

case AVAHI_RESOLVER_FOUND:

1020

1001

char ip[AVAHI_ADDRESS_STR_MAX];

1021

1002

avahi_address_snprint(ip, sizeof(ip), address);

1022

1003

if(debug){

1023

fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"

1024

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

1025

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

1004

fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"

1005

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

1006

ip, (intmax_t)interface, port);

1026

1007

}

1027

1008

int ret = start_mandos_communication(ip, port, interface,

1028

1009

avahi_proto_to_af(proto));

1060

1041

default:

1061

1042

case AVAHI_BROWSER_FAILURE:

1062

1043

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1044

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

1045

avahi_strerror(avahi_server_errno(mc.server)));

1065

1046

avahi_simple_poll_quit(mc.simple_poll);

1066

1047

return;

1067

1048

1074

1055

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

1075

1056

name, type, domain, protocol, 0,

1076

1057

resolve_callback, NULL) == NULL)

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1058

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

1059

name, avahi_strerror(avahi_server_errno(mc.server)));

1080

1060

break;

1081

1061

1082

1062

case AVAHI_BROWSER_REMOVE:

1085

1065

case AVAHI_BROWSER_ALL_FOR_NOW:

1086

1066

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1087

1067

if(debug){

1088

fprintf_plus(stderr, "No Mandos server found, still"

1089

" searching...\n");

1068

fprintf(stderr, "No Mandos server found, still searching...\n");

1090

1069

}

1091

1070

break;

1092

1071

}

1131

1110

/* Reject the loopback device */

1132

1111

if(ifr->ifr_flags & IFF_LOOPBACK){

1133

1112

if(debug){

1134

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

1135

ifname);

1113

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1114

ifname);

1136

1115

}

1137

1116

return false;

1138

1117

}

1139

1118

/* Accept point-to-point devices only if connect_to is specified */

1140

1119

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1141

1120

if(debug){

1142

fprintf_plus(stderr, "Accepting point-to-point interface"

1143

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

1121

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1122

ifname);

1144

1123

}

1145

1124

return true;

1146

1125

}

1147

1126

/* Otherwise, reject non-broadcast-capable devices */

1148

1127

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1149

1128

if(debug){

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1129

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1130

ifname);

1152

1131

}

1153

1132

return false;

1154

1133

}

1155

1134

/* Reject non-ARP interfaces (including dummy interfaces) */

1156

1135

if(ifr->ifr_flags & IFF_NOARP){

1157

1136

if(debug){

1158

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

1159

ifname);

1137

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);

1160

1138

}

1161

1139

return false;

1162

1140

}

1163

1141

1164

1142

/* Accept this device */

1165

1143

if(debug){

1166

fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);

1144

fprintf(stderr, "Interface \"%s\" is good\n", ifname);

1167

1145

}

1168

1146

return true;

1169

1147

}

1181

1159

struct ifreq ifr;

1182

1160

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

1183

1161

if(debug){

1184

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

1185

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

1162

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1163

if_entry->d_name);

1186

1164

}

1187

1165

return 0;

1188

1166

}

1206

1184

struct ifreq ifr;

1207

1185

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

1208

1186

if(debug){

1209

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

1210

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

1187

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1188

if_entry->d_name);

1211

1189

}

1212

1190

return 0;

1213

1191

}

1215

1193

/* Reject down interfaces */

1216

1194

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

1217

1195

if(debug){

1218

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

1219

if_entry->d_name);

1196

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

1197

if_entry->d_name);

1220

1198

}

1221

1199

return 0;

1222

1200

}

1224

1202

/* Reject non-running interfaces */

1225

1203

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

1226

1204

if(debug){

1227

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

1228

if_entry->d_name);

1205

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

1206

if_entry->d_name);

1229

1207

}

1230

1208

return 0;

1231

1209

}

1250

1228

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

1251

1229

int runnable_hook(const struct dirent *direntry){

1252

1230

int ret;

1253

size_t sret;

1254

1231

struct stat st;

1255

1232

1256

1233

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

1258

1235

return 0;

1259

1236

}

1260

1237

1261

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

1262

"abcdefghijklmnopqrstuvwxyz"

1263

"0123456789"

1264

"_-");

1265

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

1266

/* Contains non-allowed characters */

1267

if(debug){

1268

fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",

1269

direntry->d_name);

1270

}

1271

return 0;

1272

}

1273

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);

1238

/* Save pointer to last character */

1239

char *end = strchr(direntry->d_name, '\0')-1;

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

if(((direntry->d_name)[0] == '#')

1247

and (*end == '#')){

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

ret = stat(direntry->d_name, &st);

1282

1255

if(ret == -1){

1283

1256

if(debug){

1284

perror_plus("Could not stat hook");

1257

perror_plus("Could not stat plugin");

1285

1258

}

1286

1259

return 0;

1287

1260

}

1288

1261

if(not (S_ISREG(st.st_mode))){

1289

1262

/* Not a regular file */

1290

if(debug){

1291

fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",

1292

direntry->d_name);

1293

}

1294

1263

return 0;

1295

1264

}

1296

1265

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1297

1266

/* Not executable */

1298

if(debug){

1299

fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",

1300

direntry->d_name);

1301

}

1302

1267

return 0;

1303

1268

}

1304

1269

return 1;

1313

1278

while(true){

1314

1279

if(mc.current_server == NULL){

1315

1280

if (debug){

1316

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

1317

" No timeout!\n");

1281

fprintf(stderr,

1282

"Wait until first server is found. No timeout!\n");

1318

1283

}

1319

1284

ret = avahi_simple_poll_iterate(s, -1);

1320

1285

} else {

1321

1286

if (debug){

1322

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

1323

" it, or wait\n");

1287

fprintf(stderr, "Check current_server if we should run it,"

1288

" or wait\n");

1324

1289

}

1325

1290

/* the current time */

1326

1291

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1342

1307

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

1343

1308

1344

1309

if (debug){

1345

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

1346

block_time);

1310

fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);

1347

1311

}

1348

1312

1349

1313

if(block_time <= 0){

1369

1333

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

1370

1334

}

1371

1335

if(ret != 0){

1372

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

1336

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

1373

1337

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

1374

1338

}

1375

1339

}

1376

1340

}

1377

1341

}

1378

1342

1379

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

1380

const float delay){

1381

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

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

1385

alphasort);

1386

if(numhooks == -1){

1387

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){

1395

perror_plus("asprintf");

1396

continue;

1397

}

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

}

1436

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;

1475

}

1476

1477

1343

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

1478

1344

AvahiSServiceBrowser *sb = NULL;

1479

1345

int error;

1561

1427

.arg = "SECONDS",

1562

1428

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

1563

1429

.group = 2 },

1564

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

1565

.arg = "DIR",

1566

.doc = "Directory where network hooks are located",

1567

.group = 2 },

1568

1430

/*

1569

1431

* These reproduce what we would get without ARGP_NO_HELP

1570

1432

*/

1623

1485

argp_error(state, "Bad retry interval");

1624

1486

}

1625

1487

break;

1626

case 133: /* --network-hook-dir */

1627

hookdir = arg;

1628

break;

1629

1488

/*

1630

1489

* These reproduce what we would get without ARGP_NO_HELP

1631

1490

*/

1637

1496

argp_state_help(state, state->out_stream,

1638

1497

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1639

1498

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

1642

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

1499

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

1643

1500

exit(argp_err_exit_status);

1644

1501

break;

1645

1502

default:

1690

1547

if(ret == -1){

1691

1548

perror_plus("fstat");

1692

1549

} else {

1693

if(S_ISREG(st.st_mode)

1694

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

1550

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1695

1551

ret = fchown(seckey_fd, uid, gid);

1696

1552

if(ret == -1){

1697

1553

perror_plus("fchown");

1711

1567

if(ret == -1){

1712

1568

perror_plus("fstat");

1713

1569

} else {

1714

if(S_ISREG(st.st_mode)

1715

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

1570

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1716

1571

ret = fchown(pubkey_fd, uid, gid);

1717

1572

if(ret == -1){

1718

1573

perror_plus("fchown");

1731

1586

}

1732

1587

}

1733

1588

1734

/* Run network hooks */

1589

/* Find network hooks and run them */

1735

1590

{

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

}

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

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

1594

alphasort);

1595

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

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

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

1612

if(ret == -1){

1613

perror_plus("setenv");

1614

exit(1);

1615

}

1616

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

1617

if(ret == -1){

1618

perror_plus("setenv");

1619

exit(1);

1620

}

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

exit(1);

1625

}

1626

char *delaystring;

1627

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

1628

if(ret == -1){

1629

perror_plus("asprintf");

1630

exit(1);

1631

}

1632

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

1633

if(ret == -1){

1634

free(delaystring);

1635

perror_plus("setenv");

1636

exit(1);

1637

}

1638

free(delaystring);

1639

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

1640

perror_plus("execl");

1641

}

1642

free(fullname);

1643

if(quit_now){

1644

goto end;

1645

}

1646

}

1647

close(devnull);

1751

1648

}

1752

1649

1753

1650

if(not debug){

1769

1666

/* Pick the first interface returned */

1770

1667

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

1771

1668

if(debug){

1772

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

1669

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

1773

1670

}

1774

1671

if(interface == NULL){

1775

1672

perror_plus("malloc");

1780

1677

free(direntries);

1781

1678

} else {

1782

1679

free(direntries);

1783

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

1680

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

1784

1681

exitcode = EXIT_FAILURE;

1785

1682

goto end;

1786

1683

}

1792

1689

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

1793

1690

mc.simple_poll = avahi_simple_poll_new();

1794

1691

if(mc.simple_poll == NULL){

1795

fprintf_plus(stderr,

1796

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

1692

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1797

1693

exitcode = EX_UNAVAILABLE;

1798

1694

goto end;

1799

1695

}

1865

1761

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

1866

1762

if_index = (AvahiIfIndex) if_nametoindex(interface);

1867

1763

if(if_index == 0){

1868

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

1764

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

1869

1765

exitcode = EX_UNAVAILABLE;

1870

1766

goto end;

1871

1767

}

1991

1887

#endif /* __linux__ */

1992

1888

/* Lower privileges */

1993

1889

errno = 0;

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

1890

if(take_down_interface){

1891

/* Lower privileges */

1892

ret = seteuid(uid);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

} else {

1897

/* Lower privileges permanently */

1898

ret = setuid(uid);

1899

if(ret == -1){

1900

perror_plus("setuid");

1901

}

1998

1902

}

1999

1903

}

2000

1904

2004

1908

2005

1909

ret = init_gnutls_global(pubkey, seckey);

2006

1910

if(ret == -1){

2007

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

1911

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

2008

1912

exitcode = EX_UNAVAILABLE;

2009

1913

goto end;

2010

1914

} else {

2026

1930

}

2027

1931

2028

1932

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

2029

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

1933

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

2030

1934

exitcode = EX_UNAVAILABLE;

2031

1935

goto end;

2032

1936

} else {

2042

1946

/* (Mainly meant for debugging) */

2043

1947

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

2044

1948

if(address == NULL){

2045

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

1949

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

2046

1950

exitcode = EX_USAGE;

2047

1951

goto end;

2048

1952

}

2056

1960

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

2057

1961

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

2058

1962

or tmpmax != (uint16_t)tmpmax){

2059

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

1963

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

2060

1964

exitcode = EX_USAGE;

2061

1965

goto end;

2062

1966

}

2092

1996

break;

2093

1997

}

2094

1998

if(debug){

2095

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

2096

(int)retry_interval);

1999

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

2000

(int)retry_interval);

2097

2001

}

2098

2002

sleep((int)retry_interval);

2099

2003

}

2129

2033

2130

2034

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

2131

2035

if(mc.server == NULL){

2132

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

2133

avahi_strerror(error));

2036

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

2037

avahi_strerror(error));

2134

2038

exitcode = EX_UNAVAILABLE;

2135

2039

goto end;

2136

2040

}

2144

2048

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2145

2049

NULL, 0, browse_callback, NULL);

2146

2050

if(sb == NULL){

2147

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

2148

avahi_strerror(avahi_server_errno(mc.server)));

2051

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

2052

avahi_strerror(avahi_server_errno(mc.server)));

2149

2053

exitcode = EX_UNAVAILABLE;

2150

2054

goto end;

2151

2055

}

2157

2061

/* Run the main loop */

2158

2062

2159

2063

if(debug){

2160

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

2064

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

2161

2065

}

2162

2066

2163

2067

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

2068

(int)(retry_interval * 1000));

2165

2069

if(debug){

2166

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

2167

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

2070

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

2071

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

2168

2072

}

2169

2073

2170

2074

end:

2171

2075

2172

2076

if(debug){

2173

fprintf_plus(stderr, "%s exiting\n", argv[0]);

2077

fprintf(stderr, "%s exiting\n", argv[0]);

2174

2078

}

2175

2079

2176

2080

/* Cleanup things */

2204

2108

}

2205

2109

}

2206

2110

2207

/* Re-raise priviliges */

2208

{

2111

/* XXX run network hooks "stop" here */

2112

2113

/* Take down the network interface */

2114

if(take_down_interface){

2115

/* Re-raise priviliges */

2209

2116

errno = 0;

2210

2117

ret = seteuid(0);

2211

2118

if(ret == -1){

2212

2119

perror_plus("seteuid");

2213

2120

}

2214

/* Run network hooks */

2215

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

2216

goto end;

2217

}

2218

2219

/* Take down the network interface */

2220

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

2121

if(geteuid() == 0){

2221

2122

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

2222

2123

if(ret == -1){

2223

2124

perror_plus("ioctl SIOCGIFFLAGS");

2224

} else if(network.ifr_flags & IFF_UP){

2125

} else if(network.ifr_flags & IFF_UP) {

2225

2126

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

2226

2127

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

2227

2128

if(ret == -1){

2232

2133

if(ret == -1){

2233

2134

perror_plus("close");

2234

2135

}

2136

/* Lower privileges permanently */

2137

errno = 0;

2138

ret = setuid(uid);

2139

if(ret == -1){

2140

perror_plus("setuid");

2141

}

2235

2142

}

2236

2143

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2243

2144

2244

2145

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

2245

2146

if(tempdir_created){

2259

2160

}

2260

2161

ret = remove(fullname);

2261

2162

if(ret == -1){

2262

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

2263

strerror(errno));

2163

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

2164

strerror(errno));

2264

2165

}

2265

2166

free(fullname);

2266

2167

}