/mandos/trunk : revision 1092

9

* "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

16

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

17

* 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

*

15

* This file is part of Mandos.

16

*

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

18

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

19

* 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

22

24

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

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25

* 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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29

*

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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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49

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

49

#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 */

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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() */

60

#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,

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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,

519

707

const char *dhparamsfilename,

520

708

mandos_context *mc){

521

709

int ret;

522

unsigned int uret;

523

710

524

711

if(debug){

525

712

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

526

713

}

527

714

528

ret = gnutls_global_init();

529

if(ret != GNUTLS_E_SUCCESS){

530

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

531

safer_gnutls_strerror(ret));

532

return -1;

533

}

534

535

715

if(debug){

536

716

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

537

717

* - GnuTLS manual

545

725

if(ret != GNUTLS_E_SUCCESS){

546

726

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

547

727

safer_gnutls_strerror(ret));

548

gnutls_global_deinit();

549

728

return -1;

550

729

}

551

730

552

731

if(debug){

553

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

554

" 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",

555

734

pubkeyfilename,

556

735

seckeyfilename);

557

736

}

558

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

559

751

ret = gnutls_certificate_set_openpgp_key_file

560

752

(mc->cred, pubkeyfilename, seckeyfilename,

561

753

GNUTLS_OPENPGP_FMT_BASE64);

754

#else

755

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

756

#endif

562

757

if(ret != GNUTLS_E_SUCCESS){

563

758

fprintf_plus(stderr,

564

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

759

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

565

760

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

566

761

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

567

762

safer_gnutls_strerror(ret));

615

810

}

616

811

params.size += (unsigned int)bytes_read;

617

812

}

813

ret = close(dhpfile);

814

if(ret == -1){

815

perror_plus("close");

816

}

618

817

if(params.data == NULL){

619

818

dhparamsfilename = NULL;

620

819

}

629

828

safer_gnutls_strerror(ret));

630

829

dhparamsfilename = NULL;

631

830

}

831

free(params.data);

632

832

} while(false);

633

833

}

634

834

if(dhparamsfilename == NULL){

635

835

if(mc->dh_bits == 0){

836

#if GNUTLS_VERSION_NUMBER < 0x030600

636

837

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

637

838

/* Try to read the private key file */

638

839

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

718

919

}

719

920

}

720

921

}

721

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

922

unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

722

923

if(uret != 0){

723

924

mc->dh_bits = uret;

724

925

if(debug){

736

937

safer_gnutls_strerror(ret));

737

938

goto globalfail;

738

939

}

739

} else if(debug){

740

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

741

mc->dh_bits);

742

}

743

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

744

if(ret != GNUTLS_E_SUCCESS){

745

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

746

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

747

safer_gnutls_strerror(ret));

748

goto globalfail;

940

#endif

941

} else { /* dh_bits != 0 */

942

if(debug){

943

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

944

mc->dh_bits);

945

}

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);

749

954

}

750

955

}

751

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

752

956

753

957

return 0;

754

958

755

959

globalfail:

756

960

757

961

gnutls_certificate_free_credentials(mc->cred);

758

gnutls_global_deinit();

759

962

gnutls_dh_params_deinit(mc->dh_params);

760

963

return -1;

761

964

}

766

969

int ret;

767

970

/* GnuTLS session creation */

768

971

do {

769

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

));

770

980

if(quit_now){

771

981

return -1;

772

982

}

820

1030

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

821

1031

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

822

1032

823

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

824

__attribute__((warn_unused_result))

825

error_t raise_privileges(void){

826

error_t old_errno = errno;

827

error_t ret_errno = 0;

828

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

829

ret_errno = errno;

830

}

831

errno = old_errno;

832

return ret_errno;

833

}

834

835

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

836

__attribute__((warn_unused_result))

837

error_t raise_privileges_permanently(void){

838

error_t old_errno = errno;

839

error_t ret_errno = raise_privileges();

840

if(ret_errno != 0){

841

errno = old_errno;

842

return ret_errno;

843

}

844

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

845

ret_errno = errno;

846

}

847

errno = old_errno;

848

return ret_errno;

849

}

850

851

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

852

__attribute__((warn_unused_result))

853

error_t lower_privileges(void){

854

error_t old_errno = errno;

855

error_t ret_errno = 0;

856

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

857

ret_errno = errno;

858

}

859

errno = old_errno;

860

return ret_errno;

861

}

862

863

/* Lower privileges permanently */

864

__attribute__((warn_unused_result))

865

error_t lower_privileges_permanently(void){

866

error_t old_errno = errno;

867

error_t ret_errno = 0;

868

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

869

ret_errno = errno;

870

}

871

errno = old_errno;

872

return ret_errno;

873

}

874

875

1033

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

876

1034

__attribute__((nonnull, warn_unused_result))

877

1035

static bool add_delete_local_route(const bool add,

931

1089

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

932

1090

_exit(EX_OSERR);

933

1091

}

934

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

1092

ret = close(devnull);

935

1093

if(ret == -1){

936

1094

perror_plus("close");

937

1095

_exit(EX_OSERR);

954

1112

helper, O_RDONLY));

955

1113

if(helper_fd == -1){

956

1114

perror_plus("openat");

1115

close(helperdir_fd);

957

1116

_exit(EX_UNAVAILABLE);

958

1117

}

959

TEMP_FAILURE_RETRY(close(helperdir_fd));

1118

close(helperdir_fd);

960

1119

#ifdef __GNUC__

961

1120

#pragma GCC diagnostic push

962

1121

#pragma GCC diagnostic ignored "-Wcast-qual"

1081

1240

bool match = false;

1082

1241

{

1083

1242

char *interface = NULL;

1084

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

1085

interface))){

1243

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

1244

mc->interfaces_size,

1245

interface))){

1086

1246

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

1087

1247

match = true;

1088

1248

break;

1130

1290

goto mandos_end;

1131

1291

}

1132

1292

1133

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

1134

1293

if(af == AF_INET6){

1135

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

1136

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);

1137

1297

} else { /* IPv4 */

1138

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

1139

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);

1140

1301

}

1141

1302

if(ret < 0 ){

1142

1303

int e = errno;

1221

1382

sizeof(struct sockaddr_in));

1222

1383

}

1223

1384

if(ret < 0){

1224

if(errno == ENETUNREACH

1385

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

1225

1386

and if_index != AVAHI_IF_UNSPEC

1226

1387

and connect_to == NULL

1227

1388

and not route_added and

1240

1401

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

1241

1402

1242

1403

Avahi bug reference:

1243

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

1404

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

1244

1405

https://bugs.debian.org/587961

1245

1406

*/

1246

1407

if(debug){

1426

1587

&decrypted_buffer, mc);

1427

1588

if(decrypted_buffer_size >= 0){

1428

1589

1590

clearerr(stdout);

1429

1591

written = 0;

1430

1592

while(written < (size_t) decrypted_buffer_size){

1431

1593

if(quit_now){

1447

1609

}

1448

1610

written += (size_t)ret;

1449

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

}

1450

1622

retval = 0;

1451

1623

}

1452

1624

}

1465

1637

free(decrypted_buffer);

1466

1638

free(buffer);

1467

1639

if(tcp_sd >= 0){

1468

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

1640

ret = close(tcp_sd);

1469

1641

}

1470

1642

if(ret == -1){

1471

1643

if(e == 0){

1483

1655

return retval;

1484

1656

}

1485

1657

1486

__attribute__((nonnull))

1487

1658

static void resolve_callback(AvahiSServiceResolver *r,

1488

1659

AvahiIfIndex interface,

1489

1660

AvahiProtocol proto,

1626

1797

__attribute__((nonnull, warn_unused_result))

1627

1798

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

1628

1799

int ret;

1629

error_t ret_errno;

1800

int old_errno;

1630

1801

1631

1802

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

1632

1803

if(s < 0){

1633

ret_errno = errno;

1804

old_errno = errno;

1634

1805

perror_plus("socket");

1635

errno = ret_errno;

1806

errno = old_errno;

1636

1807

return false;

1637

1808

}

1638

strcpy(ifr->ifr_name, ifname);

1809

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

1810

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

1639

1811

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1640

1812

if(ret == -1){

1641

1813

if(debug){

1642

ret_errno = errno;

1814

old_errno = errno;

1643

1815

perror_plus("ioctl SIOCGIFFLAGS");

1644

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;

1645

1822

}

1646

1823

return false;

1647

1824

}

1825

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

1826

old_errno = errno;

1827

perror_plus("close");

1828

errno = old_errno;

1829

}

1648

1830

return true;

1649

1831

}

1650

1832

1911

2093

return;

1912

2094

}

1913

2095

}

1914

#ifdef __GLIBC__

1915

#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

}

1916

2101

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

1917

2102

runnable_hook, alphasort);

1918

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

1919

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

1920

alphasort);

1921

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

1922

#else /* not __GLIBC__ */

1923

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

1924

alphasort);

1925

#endif /* not __GLIBC__ */

1926

2103

if(numhooks == -1){

1927

2104

perror_plus("scandir");

2105

close(devnull);

1928

2106

return;

1929

2107

}

1930

2108

struct dirent *direntry;

1931

2109

int ret;

1932

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

1933

if(devnull == -1){

1934

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

1935

return;

1936

}

1937

2110

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

1938

2111

direntry = direntries[i];

1939

2112

if(debug){

2010

2183

perror_plus("openat");

2011

2184

_exit(EXIT_FAILURE);

2012

2185

}

2013

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

2186

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

2014

2187

perror_plus("close");

2015

2188

_exit(EXIT_FAILURE);

2016

2189

}

2019

2192

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

2020

2193

_exit(EX_OSERR);

2021

2194

}

2022

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

2195

ret = close(devnull);

2023

2196

if(ret == -1){

2024

2197

perror_plus("close");

2025

2198

_exit(EX_OSERR);

2074

2247

free(direntry);

2075

2248

}

2076

2249

free(direntries);

2077

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

2250

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

2078

2251

perror_plus("close");

2079

2252

} else {

2080

2253

hookdir_fd = -1;

2083

2256

}

2084

2257

2085

2258

__attribute__((nonnull, warn_unused_result))

2086

error_t bring_up_interface(const char *const interface,

2087

const float delay){

2088

error_t old_errno = errno;

2259

int bring_up_interface(const char *const interface,

2260

const float delay){

2261

int old_errno = errno;

2089

2262

int ret;

2090

2263

struct ifreq network;

2091

2264

unsigned int if_index = if_nametoindex(interface);

2101

2274

}

2102

2275

2103

2276

if(not interface_is_up(interface)){

2104

error_t ret_errno = 0, ioctl_errno = 0;

2277

int ret_errno = 0;

2278

int ioctl_errno = 0;

2105

2279

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

2106

2280

ret_errno = errno;

2107

2281

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

2120

2294

}

2121

2295

2122

2296

if(quit_now){

2123

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

2297

ret = close(sd);

2124

2298

if(ret == -1){

2125

2299

perror_plus("close");

2126

2300

}

2176

2350

}

2177

2351

2178

2352

/* Close the socket */

2179

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

2353

ret = close(sd);

2180

2354

if(ret == -1){

2181

2355

perror_plus("close");

2182

2356

}

2194

2368

2195

2369

/* Sleep checking until interface is running.

2196

2370

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

2197

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

2371

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

2198

2372

if(interface_is_running(interface)){

2199

2373

break;

2200

2374

}

2210

2384

}

2211

2385

2212

2386

__attribute__((nonnull, warn_unused_result))

2213

error_t take_down_interface(const char *const interface){

2214

error_t old_errno = errno;

2387

int take_down_interface(const char *const interface){

2388

int old_errno = errno;

2215

2389

struct ifreq network;

2216

2390

unsigned int if_index = if_nametoindex(interface);

2217

2391

if(if_index == 0){

2220

2394

return ENXIO;

2221

2395

}

2222

2396

if(interface_is_up(interface)){

2223

error_t ret_errno = 0, ioctl_errno = 0;

2397

int ret_errno = 0;

2398

int ioctl_errno = 0;

2224

2399

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

2225

2400

ret_errno = errno;

2226

2401

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

2264

2439

}

2265

2440

2266

2441

/* Close the socket */

2267

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

2442

int ret = close(sd);

2268

2443

if(ret == -1){

2269

2444

perror_plus("close");

2270

2445

}

2286

2461

2287

2462

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

2288

2463

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

2289

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

2290

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

2291

.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 };

2292

2476

AvahiSServiceBrowser *sb = NULL;

2293

2477

error_t ret_errno;

2294

2478

int ret;

2303

2487

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2304

2488

const char *seckey = PATHDIR "/" SECKEY;

2305

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

2306

2494

const char *dh_params_file = NULL;

2307

2495

char *interfaces_hooks = NULL;

2308

2496

2356

2544

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

2357

2545

.arg = "FILE",

2358

2546

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

2359

.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 },

2360

2564

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

2361

2565

.arg = "BITS",

2362

2566

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

2418

2622

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

2419

2623

pubkey = arg;

2420

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;

2421

2635

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

2422

2636

errno = 0;

2423

2637

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

2458

2672

argp_state_help(state, state->out_stream,

2459

2673

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

2460

2674

& ~(unsigned int)ARGP_HELP_EXIT_OK);

2675

__builtin_unreachable();

2461

2676

case -3: /* --usage */

2462

2677

argp_state_help(state, state->out_stream,

2463

2678

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2679

__builtin_unreachable();

2464

2680

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

2465

2681

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

2466

2682

exit(argp_err_exit_status);

2475

2691

.args_doc = "",

2476

2692

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

2477

2693

" passwords from a Mandos server" };

2478

ret = argp_parse(&argp, argc, argv,

2479

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2480

switch(ret){

2694

ret_errno = argp_parse(&argp, argc, argv,

2695

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2696

switch(ret_errno){

2481

2697

case 0:

2482

2698

break;

2483

2699

case ENOMEM:

2484

2700

default:

2485

errno = ret;

2701

errno = ret_errno;

2486

2702

perror_plus("argp_parse");

2487

2703

exitcode = EX_OSERR;

2488

2704

goto end;

2494

2710

2495

2711

{

2496

2712

/* Work around Debian bug #633582:

2497

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

2713

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

2498

2714

2499

2715

/* Re-raise privileges */

2500

ret_errno = raise_privileges();

2501

if(ret_errno != 0){

2502

errno = ret_errno;

2716

ret = raise_privileges();

2717

if(ret != 0){

2718

errno = ret;

2503

2719

perror_plus("Failed to raise privileges");

2504

2720

} else {

2505

2721

struct stat st;

2521

2737

}

2522

2738

}

2523

2739

}

2524

TEMP_FAILURE_RETRY(close(seckey_fd));

2740

close(seckey_fd);

2525

2741

}

2526

2742

}

2527

2743

2542

2758

}

2543

2759

}

2544

2760

}

2545

TEMP_FAILURE_RETRY(close(pubkey_fd));

2761

close(pubkey_fd);

2546

2762

}

2547

2763

}

2548

2764

2549

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

2765

if(dh_params_file != NULL

2766

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

2550

2767

int dhparams_fd = open(dh_params_file, O_RDONLY);

2551

2768

if(dhparams_fd == -1){

2552

2769

perror_plus("open");

2563

2780

}

2564

2781

}

2565

2782

}

2566

TEMP_FAILURE_RETRY(close(dhparams_fd));

2783

close(dhparams_fd);

2567

2784

}

2568

2785

}

2569

2786

2570

2787

/* Lower privileges */

2571

ret_errno = lower_privileges();

2572

if(ret_errno != 0){

2573

errno = ret_errno;

2788

ret = lower_privileges();

2789

if(ret != 0){

2790

errno = ret;

2574

2791

perror_plus("Failed to lower privileges");

2575

2792

}

2576

2793

}

2776

2993

goto end;

2777

2994

}

2778

2995

2996

#if GNUTLS_VERSION_NUMBER >= 0x030606

2997

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

2998

#elif GNUTLS_VERSION_NUMBER < 0x030600

2779

2999

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

3000

#else

3001

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

3002

#endif

2780

3003

if(ret == -1){

2781

3004

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

2782

3005

exitcode = EX_UNAVAILABLE;

2904

3127

2905

3128

/* Allocate a new server */

2906

3129

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2907

&config, NULL, NULL, &ret_errno);

3130

&config, NULL, NULL, &ret);

2908

3131

2909

3132

/* Free the Avahi configuration data */

2910

3133

avahi_server_config_free(&config);

2913

3136

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

2914

3137

if(mc.server == NULL){

2915

3138

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

2916

avahi_strerror(ret_errno));

3139

avahi_strerror(ret));

2917

3140

exitcode = EX_UNAVAILABLE;

2918

3141

goto end;

2919

3142

}

2954

3177

end:

2955

3178

2956

3179

if(debug){

2957

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

3180

if(signal_received){

3181

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

3182

argv[0], signal_received,

3183

strsignal(signal_received));

3184

} else {

3185

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

3186

}

2958

3187

}

2959

3188

2960

3189

/* Cleanup things */

2971

3200

2972

3201

if(gnutls_initialized){

2973

3202

gnutls_certificate_free_credentials(mc.cred);

2974

gnutls_global_deinit();

2975

3203

gnutls_dh_params_deinit(mc.dh_params);

2976

3204

}

2977

3205

3000

3228

3001

3229

/* Re-raise privileges */

3002

3230

{

3003

ret_errno = raise_privileges();

3004

if(ret_errno != 0){

3005

errno = ret_errno;

3231

ret = raise_privileges();

3232

if(ret != 0){

3233

errno = ret;

3006

3234

perror_plus("Failed to raise privileges");

3007

3235

} else {

3008

3236

3013

3241

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

3014

3242

{

3015

3243

char *interface = NULL;

3016

while((interface=argz_next(interfaces_to_take_down,

3017

interfaces_to_take_down_size,

3018

interface))){

3019

ret_errno = take_down_interface(interface);

3020

if(ret_errno != 0){

3021

errno = ret_errno;

3244

while((interface = argz_next(interfaces_to_take_down,

3245

interfaces_to_take_down_size,

3246

interface))){

3247

ret = take_down_interface(interface);

3248

if(ret != 0){

3249

errno = ret;

3022

3250

perror_plus("Failed to take down interface");

3023

3251

}

3024

3252

}

3029

3257

}

3030

3258

}

3031

3259

3032

ret_errno = lower_privileges_permanently();

3033

if(ret_errno != 0){

3034

errno = ret_errno;

3260

ret = lower_privileges_permanently();

3261

if(ret != 0){

3262

errno = ret;

3035

3263

perror_plus("Failed to lower privileges permanently");

3036

3264

}

3037

3265

}

3039

3267

free(interfaces_to_take_down);

3040

3268

free(interfaces_hooks);

3041

3269

3270

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

3271

uintmax_t level){

3272

struct dirent **direntries = NULL;

3273

int dret;

3274

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

3275

O_RDONLY

3276

| O_NOFOLLOW

3277

| O_DIRECTORY

3278

| O_PATH));

3279

if(dir_fd == -1){

3280

perror_plus("open");

3281

return;

3282

}

3283

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

3284

notdotentries, alphasort);

3285

if(numentries >= 0){

3286

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

3287

if(debug){

3288

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

3289

dirname, direntries[i]->d_name);

3290

}

3291

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

3292

if(dret == -1){

3293

if(errno == EISDIR){

3294

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

3295

AT_REMOVEDIR);

3296

}

3297

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

3298

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

3299

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

3300

/* Recurse only in this special case */

3301

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

3302

dret = 0;

3303

}

3304

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

3305

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

3306

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

3307

}

3308

}

3309

free(direntries[i]);

3310

}

3311

3312

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

3313

free(direntries);

3314

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3315

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

3316

perror_plus("rmdir");

3317

}

3318

} else {

3319

perror_plus("scandirat");

3320

}

3321

close(dir_fd);

3322

}

3323

3042

3324

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

3043

3325

if(tempdir != NULL){

3044

struct dirent **direntries = NULL;

3045

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

3046

| O_NOFOLLOW

3047

| O_DIRECTORY

3048

| O_PATH));

3049

if(tempdir_fd == -1){

3050

perror_plus("open");

3051

} else {

3052

#ifdef __GLIBC__

3053

#if __GLIBC_PREREQ(2, 15)

3054

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

3055

notdotentries, alphasort);

3056

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

3057

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

3058

alphasort);

3059

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

3060

#else /* not __GLIBC__ */

3061

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

3062

alphasort);

3063

#endif /* not __GLIBC__ */

3064

if(numentries >= 0){

3065

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

3066

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

3067

if(ret == -1){

3068

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

3069

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

3070

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

3071

}

3072

free(direntries[i]);

3073

}

3074

3075

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

3076

free(direntries);

3077

if(numentries == -1){

3078

perror_plus("scandir");

3079

}

3080

ret = rmdir(tempdir);

3081

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

3082

perror_plus("rmdir");

3083

}

3084

}

3085

TEMP_FAILURE_RETRY(close(tempdir_fd));

3086

}

3326

clean_dir_at(-1, tempdir, 0);

3087

3327

}

3088

3328

3089

3329

if(quit_now){