/mandos/trunk : revision 969

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

10

*

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* Everything else is

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*

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

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

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* published by the Free Software Foundation, either version 3 of the

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* License, or (at your option) any later version.

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*

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* This program is distributed in the hope that it will be useful, but

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13

14

*

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* This file is part of Mandos.

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*

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* Mandos is free software: you can redistribute it and/or modify it

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* under the terms of the GNU General Public License as published by

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* the Free Software Foundation, either version 3 of the License, or

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* (at your option) any later version.

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*

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* Mandos is distributed in the hope that it will be useful, but

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* WITHOUT ANY WARRANTY; without even the implied warranty of

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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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* General Public License for more details.

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26

*

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* You should have received a copy of the GNU General Public License

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* along with this program. If not, see

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* <http://www.gnu.org/licenses/>.

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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.

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*

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* Contact the authors at <mandos@recompile.se>.

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31

*/

46

47

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

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48

strtof(), abort() */

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#include <stdbool.h> /* bool, false, true */

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#include <string.h> /* memset(), strcmp(), strlen(),

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strerror(), asprintf(), strcpy() */

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#include <string.h> /* strcmp(), strlen(), strerror(),

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asprintf(), strncpy(), strsignal()

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*/

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53

#include <sys/ioctl.h> /* ioctl */

52

54

#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

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sockaddr_in6, PF_INET6,

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

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inet_pton(), connect(),

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61

getnameinfo() */

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

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

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63

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

62

64

*/

63

65

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

64

66

strtoimax() */

65

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

67

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

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EAI_SYSTEM, ENETUNREACH,

69

EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

71

ENOTEMPTY,

66

72

program_invocation_short_name */

67

73

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

68

74

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

117

123

gnutls_*

118

124

init_gnutls_session(),

119

125

GNUTLS_* */

126

#if GNUTLS_VERSION_NUMBER < 0x030600

120

127

#include <gnutls/openpgp.h>

121

128

/* gnutls_certificate_set_openpgp_key_file(),

122

129

GNUTLS_OPENPGP_FMT_BASE64 */

130

#elif GNUTLS_VERSION_NUMBER >= 0x030606

131

#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,

132

GNUTLS_PKCS_PLAIN,

133

GNUTLS_PKCS_NULL_PASSWORD */

134

#endif

123

135

124

136

/* GPGME */

125

137

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

133

145

#define PATHDIR "/conf/conf.d/mandos"

134

146

#define SECKEY "seckey.txt"

135

147

#define PUBKEY "pubkey.txt"

148

#define TLS_PRIVKEY "tls-privkey.pem"

149

#define TLS_PUBKEY "tls-pubkey.pem"

136

150

#define HOOKDIR "/lib/mandos/network-hooks.d"

137

151

138

152

bool debug = false;

266

280

return true;

267

281

}

268

282

283

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

284

__attribute__((warn_unused_result))

285

int raise_privileges(void){

286

int old_errno = errno;

287

int ret = 0;

288

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

289

ret = errno;

290

}

291

errno = old_errno;

292

return ret;

293

}

294

295

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

296

__attribute__((warn_unused_result))

297

int raise_privileges_permanently(void){

298

int old_errno = errno;

299

int ret = raise_privileges();

300

if(ret != 0){

301

errno = old_errno;

302

return ret;

303

}

304

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

305

ret = errno;

306

}

307

errno = old_errno;

308

return ret;

309

}

310

311

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

312

__attribute__((warn_unused_result))

313

int lower_privileges(void){

314

int old_errno = errno;

315

int ret = 0;

316

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

317

ret = errno;

318

}

319

errno = old_errno;

320

return ret;

321

}

322

323

/* Lower privileges permanently */

324

__attribute__((warn_unused_result))

325

int lower_privileges_permanently(void){

326

int old_errno = errno;

327

int ret = 0;

328

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

329

ret = errno;

330

}

331

errno = old_errno;

332

return ret;

333

}

334

269

335

/*

270

336

* Initialize GPGME.

271

337

*/

291

357

return false;

292

358

}

293

359

360

/* Workaround for systems without a real-time clock; see also

361

Debian bug #894495: <https://bugs.debian.org/894495> */

362

do {

363

{

364

time_t currtime = time(NULL);

365

if(currtime != (time_t)-1){

366

struct tm tm;

367

if(gmtime_r(&currtime, &tm) == NULL) {

368

perror_plus("gmtime_r");

369

break;

370

}

371

if(tm.tm_year != 70 or tm.tm_mon != 0){

372

break;

373

}

374

if(debug){

375

fprintf_plus(stderr, "System clock is January 1970");

376

}

377

} else {

378

if(debug){

379

fprintf_plus(stderr, "System clock is invalid");

380

}

381

}

382

}

383

struct stat keystat;

384

ret = fstat(fd, &keystat);

385

if(ret != 0){

386

perror_plus("fstat");

387

break;

388

}

389

ret = raise_privileges();

390

if(ret != 0){

391

errno = ret;

392

perror_plus("Failed to raise privileges");

393

break;

394

}

395

if(debug){

396

fprintf_plus(stderr,

397

"Setting system clock to key file mtime");

398

}

399

time_t keytime = keystat.st_mtim.tv_sec;

400

if(stime(&keytime) != 0){

401

perror_plus("stime");

402

}

403

ret = lower_privileges();

404

if(ret != 0){

405

errno = ret;

406

perror_plus("Failed to lower privileges");

407

}

408

} while(false);

409

294

410

rc = gpgme_data_new_from_fd(&pgp_data, fd);

295

411

if(rc != GPG_ERR_NO_ERROR){

296

412

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

304

420

gpgme_strsource(rc), gpgme_strerror(rc));

305

421

return false;

306

422

}

423

{

424

gpgme_import_result_t import_result

425

= gpgme_op_import_result(mc->ctx);

426

if((import_result->imported < 1

427

or import_result->not_imported > 0)

428

and import_result->unchanged == 0){

429

fprintf_plus(stderr, "bad gpgme_op_import_results:\n");

430

fprintf_plus(stderr,

431

"The total number of considered keys: %d\n",

432

import_result->considered);

433

fprintf_plus(stderr,

434

"The number of keys without user ID: %d\n",

435

import_result->no_user_id);

436

fprintf_plus(stderr,

437

"The total number of imported keys: %d\n",

438

import_result->imported);

439

fprintf_plus(stderr, "The number of imported RSA keys: %d\n",

440

import_result->imported_rsa);

441

fprintf_plus(stderr, "The number of unchanged keys: %d\n",

442

import_result->unchanged);

443

fprintf_plus(stderr, "The number of new user IDs: %d\n",

444

import_result->new_user_ids);

445

fprintf_plus(stderr, "The number of new sub keys: %d\n",

446

import_result->new_sub_keys);

447

fprintf_plus(stderr, "The number of new signatures: %d\n",

448

import_result->new_signatures);

449

fprintf_plus(stderr, "The number of new revocations: %d\n",

450

import_result->new_revocations);

451

fprintf_plus(stderr,

452

"The total number of secret keys read: %d\n",

453

import_result->secret_read);

454

fprintf_plus(stderr,

455

"The number of imported secret keys: %d\n",

456

import_result->secret_imported);

457

fprintf_plus(stderr,

458

"The number of unchanged secret keys: %d\n",

459

import_result->secret_unchanged);

460

fprintf_plus(stderr, "The number of keys not imported: %d\n",

461

import_result->not_imported);

462

for(gpgme_import_status_t import_status

463

= import_result->imports;

464

import_status != NULL;

465

import_status = import_status->next){

466

fprintf_plus(stderr, "Import status for key: %s\n",

467

import_status->fpr);

468

if(import_status->result != GPG_ERR_NO_ERROR){

469

fprintf_plus(stderr, "Import result: %s: %s\n",

470

gpgme_strsource(import_status->result),

471

gpgme_strerror(import_status->result));

472

}

473

fprintf_plus(stderr, "Key status:\n");

474

fprintf_plus(stderr,

475

import_status->status & GPGME_IMPORT_NEW

476

? "The key was new.\n"

477

: "The key was not new.\n");

478

fprintf_plus(stderr,

479

import_status->status & GPGME_IMPORT_UID

480

? "The key contained new user IDs.\n"

481

: "The key did not contain new user IDs.\n");

482

fprintf_plus(stderr,

483

import_status->status & GPGME_IMPORT_SIG

484

? "The key contained new signatures.\n"

485

: "The key did not contain new signatures.\n");

486

fprintf_plus(stderr,

487

import_status->status & GPGME_IMPORT_SUBKEY

488

? "The key contained new sub keys.\n"

489

: "The key did not contain new sub keys.\n");

490

fprintf_plus(stderr,

491

import_status->status & GPGME_IMPORT_SECRET

492

? "The key contained a secret key.\n"

493

: "The key did not contain a secret key.\n");

494

}

495

return false;

496

}

497

}

307

498

308

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

499

ret = close(fd);

309

500

if(ret == -1){

310

501

perror_plus("close");

311

502

}

350

541

/* Create new GPGME "context" */

351

542

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

352

543

if(rc != GPG_ERR_NO_ERROR){

353

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

354

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

355

gpgme_strerror(rc));

544

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

545

gpgme_strsource(rc), gpgme_strerror(rc));

356

546

return false;

357

547

}

358

548

394

584

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

395

585

rc = gpgme_data_new(&dh_plain);

396

586

if(rc != GPG_ERR_NO_ERROR){

397

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

398

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

587

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

399

588

gpgme_strsource(rc), gpgme_strerror(rc));

400

589

gpgme_data_release(dh_crypto);

401

590

return -1;

414

603

if(result == NULL){

415

604

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

416

605

} else {

417

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

418

result->unsupported_algorithm);

419

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

420

result->wrong_key_usage);

606

if(result->unsupported_algorithm != NULL) {

607

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

608

result->unsupported_algorithm);

609

}

610

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

611

result->wrong_key_usage ? "Yes" : "No");

421

612

if(result->file_name != NULL){

422

613

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

423

614

}

424

gpgme_recipient_t recipient;

425

recipient = result->recipients;

426

while(recipient != NULL){

615

616

for(gpgme_recipient_t r = result->recipients; r != NULL;

617

r = r->next){

427

618

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

428

gpgme_pubkey_algo_name

429

(recipient->pubkey_algo));

430

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

619

gpgme_pubkey_algo_name(r->pubkey_algo));

620

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

431

621

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

432

recipient->status == GPG_ERR_NO_SECKEY

433

? "No" : "Yes");

434

recipient = recipient->next;

622

r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");

435

623

}

436

624

}

437

625

}

513

701

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

514

702

}

515

703

516

__attribute__((nonnull, warn_unused_result))

704

__attribute__((nonnull(1, 2, 4), warn_unused_result))

517

705

static int init_gnutls_global(const char *pubkeyfilename,

518

706

const char *seckeyfilename,

707

const char *dhparamsfilename,

519

708

mandos_context *mc){

520

709

int ret;

521

unsigned int uret;

522

710

523

711

if(debug){

524

712

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

525

713

}

526

714

527

ret = gnutls_global_init();

528

if(ret != GNUTLS_E_SUCCESS){

529

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

530

safer_gnutls_strerror(ret));

531

return -1;

532

}

533

534

715

if(debug){

535

716

/* "Use a log level over 10 to enable all debugging options."

536

717

* - GnuTLS manual

544

725

if(ret != GNUTLS_E_SUCCESS){

545

726

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

546

727

safer_gnutls_strerror(ret));

547

gnutls_global_deinit();

548

728

return -1;

549

729

}

550

730

551

731

if(debug){

552

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

553

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

732

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

733

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

554

734

pubkeyfilename,

555

735

seckeyfilename);

556

736

}

557

737

738

#if GNUTLS_VERSION_NUMBER >= 0x030606

739

ret = gnutls_certificate_set_rawpk_key_file

740

(mc->cred, pubkeyfilename, seckeyfilename,

741

GNUTLS_X509_FMT_PEM, /* format */

742

NULL, /* pass */

743

/* key_usage */

744

GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,

745

NULL, /* names */

746

0, /* names_length */

747

/* privkey_flags */

748

GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,

749

0); /* pkcs11_flags */

750

#elif GNUTLS_VERSION_NUMBER < 0x030600

558

751

ret = gnutls_certificate_set_openpgp_key_file

559

752

(mc->cred, pubkeyfilename, seckeyfilename,

560

753

GNUTLS_OPENPGP_FMT_BASE64);

754

#else

755

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

756

#endif

561

757

if(ret != GNUTLS_E_SUCCESS){

562

758

fprintf_plus(stderr,

563

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

759

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

564

760

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

565

761

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

566

762

safer_gnutls_strerror(ret));

575

771

safer_gnutls_strerror(ret));

576

772

goto globalfail;

577

773

}

578

if(mc->dh_bits == 0){

579

/* Find out the optimal number of DH bits */

580

/* Try to read the private key file */

581

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

582

{

583

int secfile = open(seckeyfilename, O_RDONLY);

584

size_t buffer_capacity = 0;

774

/* If a Diffie-Hellman parameters file was given, try to use it */

775

if(dhparamsfilename != NULL){

776

gnutls_datum_t params = { .data = NULL, .size = 0 };

777

do {

778

int dhpfile = open(dhparamsfilename, O_RDONLY);

779

if(dhpfile == -1){

780

perror_plus("open");

781

dhparamsfilename = NULL;

782

break;

783

}

784

size_t params_capacity = 0;

585

785

while(true){

586

buffer_capacity = incbuffer((char **)&buffer.data,

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

786

params_capacity = incbuffer((char **)&params.data,

787

(size_t)params.size,

788

(size_t)params_capacity);

789

if(params_capacity == 0){

590

790

perror_plus("incbuffer");

591

free(buffer.data);

592

buffer.data = NULL;

791

free(params.data);

792

params.data = NULL;

793

dhparamsfilename = NULL;

593

794

break;

594

795

}

595

ssize_t bytes_read = read(secfile, buffer.data + buffer.size,

796

ssize_t bytes_read = read(dhpfile,

797

params.data + params.size,

596

798

BUFFER_SIZE);

597

799

/* EOF */

598

800

if(bytes_read == 0){

601

803

/* check bytes_read for failure */

602

804

if(bytes_read < 0){

603

805

perror_plus("read");

604

free(buffer.data);

605

buffer.data = NULL;

606

break;

607

}

608

buffer.size += (unsigned int)bytes_read;

609

}

610

close(secfile);

611

}

612

/* If successful, use buffer to parse private key */

613

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

614

if(buffer.data != NULL){

615

{

616

gnutls_openpgp_privkey_t privkey = NULL;

617

ret = gnutls_openpgp_privkey_init(&privkey);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Error initializing OpenPGP key"

620

" structure: %s", safer_gnutls_strerror(ret));

621

free(buffer.data);

622

buffer.data = NULL;

623

} else {

624

ret = gnutls_openpgp_privkey_import(privkey, &buffer,

625

GNUTLS_OPENPGP_FMT_BASE64,

626

"", 0);

806

free(params.data);

807

params.data = NULL;

808

dhparamsfilename = NULL;

809

break;

810

}

811

params.size += (unsigned int)bytes_read;

812

}

813

ret = close(dhpfile);

814

if(ret == -1){

815

perror_plus("close");

816

}

817

if(params.data == NULL){

818

dhparamsfilename = NULL;

819

}

820

if(dhparamsfilename == NULL){

821

break;

822

}

823

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

824

GNUTLS_X509_FMT_PEM);

825

if(ret != GNUTLS_E_SUCCESS){

826

fprintf_plus(stderr, "Failed to parse DH parameters in file"

827

" \"%s\": %s\n", dhparamsfilename,

828

safer_gnutls_strerror(ret));

829

dhparamsfilename = NULL;

830

}

831

free(params.data);

832

} while(false);

833

}

834

if(dhparamsfilename == NULL){

835

if(mc->dh_bits == 0){

836

#if GNUTLS_VERSION_NUMBER < 0x030600

837

/* Find out the optimal number of DH bits */

838

/* Try to read the private key file */

839

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

840

do {

841

int secfile = open(seckeyfilename, O_RDONLY);

842

if(secfile == -1){

843

perror_plus("open");

844

break;

845

}

846

size_t buffer_capacity = 0;

847

while(true){

848

buffer_capacity = incbuffer((char **)&buffer.data,

849

(size_t)buffer.size,

850

(size_t)buffer_capacity);

851

if(buffer_capacity == 0){

852

perror_plus("incbuffer");

853

free(buffer.data);

854

buffer.data = NULL;

855

break;

856

}

857

ssize_t bytes_read = read(secfile,

858

buffer.data + buffer.size,

859

BUFFER_SIZE);

860

/* EOF */

861

if(bytes_read == 0){

862

break;

863

}

864

/* check bytes_read for failure */

865

if(bytes_read < 0){

866

perror_plus("read");

867

free(buffer.data);

868

buffer.data = NULL;

869

break;

870

}

871

buffer.size += (unsigned int)bytes_read;

872

}

873

close(secfile);

874

} while(false);

875

/* If successful, use buffer to parse private key */

876

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

877

if(buffer.data != NULL){

878

{

879

gnutls_openpgp_privkey_t privkey = NULL;

880

ret = gnutls_openpgp_privkey_init(&privkey);

627

881

if(ret != GNUTLS_E_SUCCESS){

628

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

882

fprintf_plus(stderr, "Error initializing OpenPGP key"

883

" structure: %s",

629

884

safer_gnutls_strerror(ret));

630

privkey = NULL;

885

free(buffer.data);

886

buffer.data = NULL;

887

} else {

888

ret = gnutls_openpgp_privkey_import

889

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

890

if(ret != GNUTLS_E_SUCCESS){

891

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

892

safer_gnutls_strerror(ret));

893

privkey = NULL;

894

}

895

free(buffer.data);

896

buffer.data = NULL;

897

if(privkey != NULL){

898

/* Use private key to suggest an appropriate

899

sec_param */

900

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

901

gnutls_openpgp_privkey_deinit(privkey);

902

if(debug){

903

fprintf_plus(stderr, "This OpenPGP key implies using"

904

" a GnuTLS security parameter \"%s\".\n",

905

safe_string(gnutls_sec_param_get_name

906

(sec_param)));

907

}

908

}

631

909

}

632

free(buffer.data);

633

buffer.data = NULL;

634

if(privkey != NULL){

635

/* Use private key to suggest an appropriate sec_param */

636

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

637

gnutls_openpgp_privkey_deinit(privkey);

638

if(debug){

639

fprintf_plus(stderr, "This OpenPGP key implies using a"

640

" GnuTLS security parameter \"%s\".\n",

641

safe_string(gnutls_sec_param_get_name

642

(sec_param)));

643

}

910

}

911

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

912

/* Err on the side of caution */

913

sec_param = GNUTLS_SEC_PARAM_ULTRA;

914

if(debug){

915

fprintf_plus(stderr, "Falling back to security parameter"

916

" \"%s\"\n",

917

safe_string(gnutls_sec_param_get_name

918

(sec_param)));

644

919

}

645

920

}

646

921

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

922

unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

923

if(uret != 0){

924

mc->dh_bits = uret;

650

925

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

926

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

927

" implies %u DH bits; using that.\n",

653

928

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

929

(sec_param)),

930

mc->dh_bits);

655

931

}

656

}

657

}

658

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

659

if(uret != 0){

660

mc->dh_bits = uret;

661

if(debug){

662

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

663

" implies %u DH bits; using that.\n",

932

} else {

933

fprintf_plus(stderr, "Failed to get implied number of DH"

934

" bits for security parameter \"%s\"): %s\n",

664

935

safe_string(gnutls_sec_param_get_name

665

936

(sec_param)),

937

safer_gnutls_strerror(ret));

938

goto globalfail;

939

}

940

#endif

941

} else { /* dh_bits != 0 */

942

if(debug){

943

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

666

944

mc->dh_bits);

667

945

}

668

} else {

669

fprintf_plus(stderr, "Failed to get implied number of DH"

670

" bits for security parameter \"%s\"): %s\n",

671

safe_string(gnutls_sec_param_get_name(sec_param)),

672

safer_gnutls_strerror(ret));

673

goto globalfail;

946

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

947

if(ret != GNUTLS_E_SUCCESS){

948

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"

949

" bits): %s\n", mc->dh_bits,

950

safer_gnutls_strerror(ret));

951

goto globalfail;

952

}

953

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

674

954

}

675

} else if(debug){

676

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

677

mc->dh_bits);

678

}

679

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

680

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"

682

" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));

683

goto globalfail;

684

}

685

686

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

955

}

687

956

688

957

return 0;

689

958

690

959

globalfail:

691

960

692

961

gnutls_certificate_free_credentials(mc->cred);

693

gnutls_global_deinit();

694

962

gnutls_dh_params_deinit(mc->dh_params);

695

963

return -1;

696

964

}

701

969

int ret;

702

970

/* GnuTLS session creation */

703

971

do {

704

ret = gnutls_init(session, GNUTLS_SERVER);

972

ret = gnutls_init(session, (GNUTLS_SERVER

973

#if GNUTLS_VERSION_NUMBER >= 0x030506

974

| GNUTLS_NO_TICKETS

975

#endif

976

#if GNUTLS_VERSION_NUMBER >= 0x030606

977

| GNUTLS_ENABLE_RAWPK

978

#endif

979

));

705

980

if(quit_now){

706

981

return -1;

707

982

}

748

1023

/* ignore client certificate if any. */

749

1024

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

750

1025

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

752

753

1026

return 0;

754

1027

}

755

1028

757

1030

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

758

1031

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

759

1032

760

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

761

__attribute__((warn_unused_result))

762

error_t raise_privileges(void){

763

error_t old_errno = errno;

764

error_t ret_errno = 0;

765

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

766

ret_errno = errno;

767

}

768

errno = old_errno;

769

return ret_errno;

770

}

771

772

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

773

__attribute__((warn_unused_result))

774

error_t raise_privileges_permanently(void){

775

error_t old_errno = errno;

776

error_t ret_errno = raise_privileges();

777

if(ret_errno != 0){

778

errno = old_errno;

779

return ret_errno;

780

}

781

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

782

ret_errno = errno;

783

}

784

errno = old_errno;

785

return ret_errno;

786

}

787

788

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

789

__attribute__((warn_unused_result))

790

error_t lower_privileges(void){

791

error_t old_errno = errno;

792

error_t ret_errno = 0;

793

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

794

ret_errno = errno;

795

}

796

errno = old_errno;

797

return ret_errno;

798

}

799

800

/* Lower privileges permanently */

801

__attribute__((warn_unused_result))

802

error_t lower_privileges_permanently(void){

803

error_t old_errno = errno;

804

error_t ret_errno = 0;

805

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

806

ret_errno = errno;

807

}

808

errno = old_errno;

809

return ret_errno;

810

}

811

812

1033

/* Helper function to add_local_route() and delete_local_route() */

813

1034

__attribute__((nonnull, warn_unused_result))

814

1035

static bool add_delete_local_route(const bool add,

868

1089

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

869

1090

_exit(EX_OSERR);

870

1091

}

871

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

1092

ret = close(devnull);

872

1093

if(ret == -1){

873

1094

perror_plus("close");

874

1095

_exit(EX_OSERR);

891

1112

helper, O_RDONLY));

892

1113

if(helper_fd == -1){

893

1114

perror_plus("openat");

1115

close(helperdir_fd);

894

1116

_exit(EX_UNAVAILABLE);

895

1117

}

896

TEMP_FAILURE_RETRY(close(helperdir_fd));

1118

close(helperdir_fd);

897

1119

#ifdef __GNUC__

898

1120

#pragma GCC diagnostic push

899

1121

#pragma GCC diagnostic ignored "-Wcast-qual"

1018

1240

bool match = false;

1019

1241

{

1020

1242

char *interface = NULL;

1021

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

1022

interface))){

1243

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

1244

mc->interfaces_size,

1245

interface))){

1023

1246

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

1024

1247

match = true;

1025

1248

break;

1067

1290

goto mandos_end;

1068

1291

}

1069

1292

1070

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

1071

1293

if(af == AF_INET6){

1072

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

1073

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

1294

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1295

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1296

ret = inet_pton(af, ip, &to6->sin6_addr);

1074

1297

} else { /* IPv4 */

1075

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

1076

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

1298

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1299

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1300

ret = inet_pton(af, ip, &to4->sin_addr);

1077

1301

}

1078

1302

if(ret < 0 ){

1079

1303

int e = errno;

1158

1382

sizeof(struct sockaddr_in));

1159

1383

}

1160

1384

if(ret < 0){

1161

if(errno == ENETUNREACH

1385

if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))

1162

1386

and if_index != AVAHI_IF_UNSPEC

1163

1387

and connect_to == NULL

1164

1388

and not route_added and

1177

1401

with an explicit route added with the server's address.

1178

1402

1179

1403

Avahi bug reference:

1180

http://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1404

https://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1181

1405

https://bugs.debian.org/587961

1182

1406

*/

1183

1407

if(debug){

1363

1587

&decrypted_buffer, mc);

1364

1588

if(decrypted_buffer_size >= 0){

1365

1589

1590

clearerr(stdout);

1366

1591

written = 0;

1367

1592

while(written < (size_t) decrypted_buffer_size){

1368

1593

if(quit_now){

1384

1609

}

1385

1610

written += (size_t)ret;

1386

1611

}

1612

ret = fflush(stdout);

1613

if(ret != 0){

1614

int e = errno;

1615

if(debug){

1616

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

1617

strerror(errno));

1618

}

1619

errno = e;

1620

goto mandos_end;

1621

}

1387

1622

retval = 0;

1388

1623

}

1389

1624

}

1402

1637

free(decrypted_buffer);

1403

1638

free(buffer);

1404

1639

if(tcp_sd >= 0){

1405

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

1640

ret = close(tcp_sd);

1406

1641

}

1407

1642

if(ret == -1){

1408

1643

if(e == 0){

1420

1655

return retval;

1421

1656

}

1422

1657

1423

__attribute__((nonnull))

1424

1658

static void resolve_callback(AvahiSServiceResolver *r,

1425

1659

AvahiIfIndex interface,

1426

1660

AvahiProtocol proto,

1563

1797

__attribute__((nonnull, warn_unused_result))

1564

1798

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

1565

1799

int ret;

1566

error_t ret_errno;

1800

int old_errno;

1567

1801

1568

1802

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

1569

1803

if(s < 0){

1570

ret_errno = errno;

1804

old_errno = errno;

1571

1805

perror_plus("socket");

1572

errno = ret_errno;

1806

errno = old_errno;

1573

1807

return false;

1574

1808

}

1575

strcpy(ifr->ifr_name, ifname);

1809

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1810

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1576

1811

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1577

1812

if(ret == -1){

1578

1813

if(debug){

1579

ret_errno = errno;

1814

old_errno = errno;

1580

1815

perror_plus("ioctl SIOCGIFFLAGS");

1581

errno = ret_errno;

1816

errno = old_errno;

1817

}

1818

if((close(s) == -1) and debug){

1819

old_errno = errno;

1820

perror_plus("close");

1821

errno = old_errno;

1582

1822

}

1583

1823

return false;

1584

1824

}

1825

if((close(s) == -1) and debug){

1826

old_errno = errno;

1827

perror_plus("close");

1828

errno = old_errno;

1829

}

1585

1830

return true;

1586

1831

}

1587

1832

1848

2093

return;

1849

2094

}

1850

2095

}

1851

#ifdef __GLIBC__

1852

#if __GLIBC_PREREQ(2, 15)

2096

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

2097

if(devnull == -1){

2098

perror_plus("open(\"/dev/null\", O_RDONLY)");

2099

return;

2100

}

1853

2101

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

1854

2102

runnable_hook, alphasort);

1855

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

1856

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

1857

alphasort);

1858

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

1859

#else /* not __GLIBC__ */

1860

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

1861

alphasort);

1862

#endif /* not __GLIBC__ */

1863

2103

if(numhooks == -1){

1864

2104

perror_plus("scandir");

2105

close(devnull);

1865

2106

return;

1866

2107

}

1867

2108

struct dirent *direntry;

1868

2109

int ret;

1869

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

1870

if(devnull == -1){

1871

perror_plus("open(\"/dev/null\", O_RDONLY)");

1872

return;

1873

}

1874

2110

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

1875

2111

direntry = direntries[i];

1876

2112

if(debug){

1947

2183

perror_plus("openat");

1948

2184

_exit(EXIT_FAILURE);

1949

2185

}

1950

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

2186

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

1951

2187

perror_plus("close");

1952

2188

_exit(EXIT_FAILURE);

1953

2189

}

1956

2192

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

1957

2193

_exit(EX_OSERR);

1958

2194

}

1959

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

2195

ret = close(devnull);

1960

2196

if(ret == -1){

1961

2197

perror_plus("close");

1962

2198

_exit(EX_OSERR);

2011

2247

free(direntry);

2012

2248

}

2013

2249

free(direntries);

2014

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

2250

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

2015

2251

perror_plus("close");

2016

2252

} else {

2017

2253

hookdir_fd = -1;

2020

2256

}

2021

2257

2022

2258

__attribute__((nonnull, warn_unused_result))

2023

error_t bring_up_interface(const char *const interface,

2024

const float delay){

2025

error_t old_errno = errno;

2259

int bring_up_interface(const char *const interface,

2260

const float delay){

2261

int old_errno = errno;

2026

2262

int ret;

2027

2263

struct ifreq network;

2028

2264

unsigned int if_index = if_nametoindex(interface);

2038

2274

}

2039

2275

2040

2276

if(not interface_is_up(interface)){

2041

error_t ret_errno = 0, ioctl_errno = 0;

2277

int ret_errno = 0;

2278

int ioctl_errno = 0;

2042

2279

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

2043

2280

ret_errno = errno;

2044

2281

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

2057

2294

}

2058

2295

2059

2296

if(quit_now){

2060

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

2297

ret = close(sd);

2061

2298

if(ret == -1){

2062

2299

perror_plus("close");

2063

2300

}

2113

2350

}

2114

2351

2115

2352

/* Close the socket */

2116

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

2353

ret = close(sd);

2117

2354

if(ret == -1){

2118

2355

perror_plus("close");

2119

2356

}

2131

2368

2132

2369

/* Sleep checking until interface is running.

2133

2370

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

2134

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

2371

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

2135

2372

if(interface_is_running(interface)){

2136

2373

break;

2137

2374

}

2147

2384

}

2148

2385

2149

2386

__attribute__((nonnull, warn_unused_result))

2150

error_t take_down_interface(const char *const interface){

2151

error_t old_errno = errno;

2387

int take_down_interface(const char *const interface){

2388

int old_errno = errno;

2152

2389

struct ifreq network;

2153

2390

unsigned int if_index = if_nametoindex(interface);

2154

2391

if(if_index == 0){

2157

2394

return ENXIO;

2158

2395

}

2159

2396

if(interface_is_up(interface)){

2160

error_t ret_errno = 0, ioctl_errno = 0;

2397

int ret_errno = 0;

2398

int ioctl_errno = 0;

2161

2399

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

2162

2400

ret_errno = errno;

2163

2401

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

2201

2439

}

2202

2440

2203

2441

/* Close the socket */

2204

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

2442

int ret = close(sd);

2205

2443

if(ret == -1){

2206

2444

perror_plus("close");

2207

2445

}

2223

2461

2224

2462

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

2225

2463

mandos_context mc = { .server = NULL, .dh_bits = 0,

2226

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

2227

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

2228

.interfaces = NULL, .interfaces_size = 0 };

2464

#if GNUTLS_VERSION_NUMBER >= 0x030606

2465

.priority = "SECURE128:!CTYPE-X.509"

2466

":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"

2467

":%PROFILE_ULTRA",

2468

#elif GNUTLS_VERSION_NUMBER < 0x030600

2469

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

2470

":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",

2471

#else

2472

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

2473

#endif

2474

.current_server = NULL, .interfaces = NULL,

2475

.interfaces_size = 0 };

2229

2476

AvahiSServiceBrowser *sb = NULL;

2230

2477

error_t ret_errno;

2231

2478

int ret;

2240

2487

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2241

2488

const char *seckey = PATHDIR "/" SECKEY;

2242

2489

const char *pubkey = PATHDIR "/" PUBKEY;

2490

#if GNUTLS_VERSION_NUMBER >= 0x030606

2491

const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;

2492

const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;

2493

#endif

2494

const char *dh_params_file = NULL;

2243

2495

char *interfaces_hooks = NULL;

2244

2496

2245

2497

bool gnutls_initialized = false;

2292

2544

{ .name = "pubkey", .key = 'p',

2293

2545

.arg = "FILE",

2294

2546

.doc = "OpenPGP public key file base name",

2295

.group = 2 },

2547

.group = 1 },

2548

{ .name = "tls-privkey", .key = 't',

2549

.arg = "FILE",

2550

#if GNUTLS_VERSION_NUMBER >= 0x030606

2551

.doc = "TLS private key file base name",

2552

#else

2553

.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",

2554

#endif

2555

.group = 1 },

2556

{ .name = "tls-pubkey", .key = 'T',

2557

.arg = "FILE",

2558

#if GNUTLS_VERSION_NUMBER >= 0x030606

2559

.doc = "TLS public key file base name",

2560

#else

2561

.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",

2562

#endif

2563

.group = 1 },

2296

2564

{ .name = "dh-bits", .key = 129,

2297

2565

.arg = "BITS",

2298

2566

.doc = "Bit length of the prime number used in the"

2299

2567

" Diffie-Hellman key exchange",

2300

2568

.group = 2 },

2569

{ .name = "dh-params", .key = 134,

2570

.arg = "FILE",

2571

.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"

2572

" for the Diffie-Hellman key exchange",

2573

.group = 2 },

2301

2574

{ .name = "priority", .key = 130,

2302

2575

.arg = "STRING",

2303

2576

.doc = "GnuTLS priority string for the TLS handshake",

2349

2622

case 'p': /* --pubkey */

2350

2623

pubkey = arg;

2351

2624

break;

2625

case 't': /* --tls-privkey */

2626

#if GNUTLS_VERSION_NUMBER >= 0x030606

2627

tls_privkey = arg;

2628

#endif

2629

break;

2630

case 'T': /* --tls-pubkey */

2631

#if GNUTLS_VERSION_NUMBER >= 0x030606

2632

tls_pubkey = arg;

2633

#endif

2634

break;

2352

2635

case 129: /* --dh-bits */

2353

2636

errno = 0;

2354

2637

tmpmax = strtoimax(arg, &tmp, 10);

2358

2641

}

2359

2642

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

2360

2643

break;

2644

case 134: /* --dh-params */

2645

dh_params_file = arg;

2646

break;

2361

2647

case 130: /* --priority */

2362

2648

mc.priority = arg;

2363

2649

break;

2403

2689

.args_doc = "",

2404

2690

.doc = "Mandos client -- Get and decrypt"

2405

2691

" passwords from a Mandos server" };

2406

ret = argp_parse(&argp, argc, argv,

2407

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2408

switch(ret){

2692

ret_errno = argp_parse(&argp, argc, argv,

2693

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2694

switch(ret_errno){

2409

2695

case 0:

2410

2696

break;

2411

2697

case ENOMEM:

2412

2698

default:

2413

errno = ret;

2699

errno = ret_errno;

2414

2700

perror_plus("argp_parse");

2415

2701

exitcode = EX_OSERR;

2416

2702

goto end;

2422

2708

2423

2709

{

2424

2710

/* Work around Debian bug #633582:

2425

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

2711

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

2426

2712

2427

2713

/* Re-raise privileges */

2428

ret_errno = raise_privileges();

2429

if(ret_errno != 0){

2430

errno = ret_errno;

2714

ret = raise_privileges();

2715

if(ret != 0){

2716

errno = ret;

2431

2717

perror_plus("Failed to raise privileges");

2432

2718

} else {

2433

2719

struct stat st;

2449

2735

}

2450

2736

}

2451

2737

}

2452

TEMP_FAILURE_RETRY(close(seckey_fd));

2738

close(seckey_fd);

2453

2739

}

2454

2740

}

2455

2741

2470

2756

}

2471

2757

}

2472

2758

}

2473

TEMP_FAILURE_RETRY(close(pubkey_fd));

2759

close(pubkey_fd);

2760

}

2761

}

2762

2763

if(dh_params_file != NULL

2764

and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2765

int dhparams_fd = open(dh_params_file, O_RDONLY);

2766

if(dhparams_fd == -1){

2767

perror_plus("open");

2768

} else {

2769

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

2770

if(ret == -1){

2771

perror_plus("fstat");

2772

} else {

2773

if(S_ISREG(st.st_mode)

2774

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

2775

ret = fchown(dhparams_fd, uid, gid);

2776

if(ret == -1){

2777

perror_plus("fchown");

2778

}

2779

}

2780

}

2781

close(dhparams_fd);

2474

2782

}

2475

2783

}

2476

2784

2477

2785

/* Lower privileges */

2478

ret_errno = lower_privileges();

2479

if(ret_errno != 0){

2480

errno = ret_errno;

2786

ret = lower_privileges();

2787

if(ret != 0){

2788

errno = ret;

2481

2789

perror_plus("Failed to lower privileges");

2482

2790

}

2483

2791

}

2653

2961

errno = bring_up_interface(interface, delay);

2654

2962

if(not interface_was_up){

2655

2963

if(errno != 0){

2656

perror_plus("Failed to bring up interface");

2964

fprintf_plus(stderr, "Failed to bring up interface \"%s\":"

2965

" %s\n", interface, strerror(errno));

2657

2966

} else {

2658

2967

errno = argz_add(&interfaces_to_take_down,

2659

2968

&interfaces_to_take_down_size,

2682

2991

goto end;

2683

2992

}

2684

2993

2685

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

2994

#if GNUTLS_VERSION_NUMBER >= 0x030606

2995

ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);

2996

#elif GNUTLS_VERSION_NUMBER < 0x030600

2997

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

2998

#else

2999

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

3000

#endif

2686

3001

if(ret == -1){

2687

3002

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

2688

3003

exitcode = EX_UNAVAILABLE;

2810

3125

2811

3126

/* Allocate a new server */

2812

3127

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2813

&config, NULL, NULL, &ret_errno);

3128

&config, NULL, NULL, &ret);

2814

3129

2815

3130

/* Free the Avahi configuration data */

2816

3131

avahi_server_config_free(&config);

2819

3134

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

2820

3135

if(mc.server == NULL){

2821

3136

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

2822

avahi_strerror(ret_errno));

3137

avahi_strerror(ret));

2823

3138

exitcode = EX_UNAVAILABLE;

2824

3139

goto end;

2825

3140

}

2860

3175

end:

2861

3176

2862

3177

if(debug){

2863

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

3178

if(signal_received){

3179

fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",

3180

argv[0], signal_received,

3181

strsignal(signal_received));

3182

} else {

3183

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

3184

}

2864

3185

}

2865

3186

2866

3187

/* Cleanup things */

2877

3198

2878

3199

if(gnutls_initialized){

2879

3200

gnutls_certificate_free_credentials(mc.cred);

2880

gnutls_global_deinit();

2881

3201

gnutls_dh_params_deinit(mc.dh_params);

2882

3202

}

2883

3203

2906

3226

2907

3227

/* Re-raise privileges */

2908

3228

{

2909

ret_errno = raise_privileges();

2910

if(ret_errno != 0){

2911

errno = ret_errno;

3229

ret = raise_privileges();

3230

if(ret != 0){

3231

errno = ret;

2912

3232

perror_plus("Failed to raise privileges");

2913

3233

} else {

2914

3234

2919

3239

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

2920

3240

{

2921

3241

char *interface = NULL;

2922

while((interface=argz_next(interfaces_to_take_down,

2923

interfaces_to_take_down_size,

2924

interface))){

2925

ret_errno = take_down_interface(interface);

2926

if(ret_errno != 0){

2927

errno = ret_errno;

3242

while((interface = argz_next(interfaces_to_take_down,

3243

interfaces_to_take_down_size,

3244

interface))){

3245

ret = take_down_interface(interface);

3246

if(ret != 0){

3247

errno = ret;

2928

3248

perror_plus("Failed to take down interface");

2929

3249

}

2930

3250

}

2935

3255

}

2936

3256

}

2937

3257

2938

ret_errno = lower_privileges_permanently();

2939

if(ret_errno != 0){

2940

errno = ret_errno;

3258

ret = lower_privileges_permanently();

3259

if(ret != 0){

3260

errno = ret;

2941

3261

perror_plus("Failed to lower privileges permanently");

2942

3262

}

2943

3263

}

2945

3265

free(interfaces_to_take_down);

2946

3266

free(interfaces_hooks);

2947

3267

3268

void clean_dir_at(int base, const char * const dirname,

3269

uintmax_t level){

3270

struct dirent **direntries = NULL;

3271

int dret;

3272

int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,

3273

O_RDONLY

3274

| O_NOFOLLOW

3275

| O_DIRECTORY

3276

| O_PATH));

3277

if(dir_fd == -1){

3278

perror_plus("open");

3279

return;

3280

}

3281

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

3282

notdotentries, alphasort);

3283

if(numentries >= 0){

3284

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

3285

if(debug){

3286

fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",

3287

dirname, direntries[i]->d_name);

3288

}

3289

dret = unlinkat(dir_fd, direntries[i]->d_name, 0);

3290

if(dret == -1){

3291

if(errno == EISDIR){

3292

dret = unlinkat(dir_fd, direntries[i]->d_name,

3293

AT_REMOVEDIR);

3294

}

3295

if((dret == -1) and (errno == ENOTEMPTY)

3296

and (strcmp(direntries[i]->d_name, "private-keys-v1.d")

3297

== 0) and (level == 0)){

3298

/* Recurse only in this special case */

3299

clean_dir_at(dir_fd, direntries[i]->d_name, level+1);

3300

dret = 0;

3301

}

3302

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

3303

fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,

3304

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

3305

}

3306

}

3307

free(direntries[i]);

3308

}

3309

3310

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

3311

free(direntries);

3312

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3313

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

3314

perror_plus("rmdir");

3315

}

3316

} else {

3317

perror_plus("scandirat");

3318

}

3319

close(dir_fd);

3320

}

3321

2948

3322

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

2949

3323

if(tempdir != NULL){

2950

struct dirent **direntries = NULL;

2951

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

2952

| O_NOFOLLOW

2953

| O_DIRECTORY

2954

| O_PATH));

2955

if(tempdir_fd == -1){

2956

perror_plus("open");

2957

} else {

2958

#ifdef __GLIBC__

2959

#if __GLIBC_PREREQ(2, 15)

2960

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

2961

notdotentries, alphasort);

2962

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

2963

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

2964

alphasort);

2965

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

2966

#else /* not __GLIBC__ */

2967

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

2968

alphasort);

2969

#endif /* not __GLIBC__ */

2970

if(numentries >= 0){

2971

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

2972

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

2973

if(ret == -1){

2974

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

2975

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

2976

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

2977

}

2978

free(direntries[i]);

2979

}

2980

2981

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

2982

free(direntries);

2983

if(numentries == -1){

2984

perror_plus("scandir");

2985

}

2986

ret = rmdir(tempdir);

2987

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

2988

perror_plus("rmdir");

2989

}

2990

}

2991

TEMP_FAILURE_RETRY(close(tempdir_fd));

2992

}

3324

clean_dir_at(-1, tempdir, 0);

2993

3325

}

2994

3326

2995

3327

if(quit_now){