/mandos/release : revision 237.7.826

9

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

10

*

11

* Everything else is

12

13

14

*

15

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

16

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

17

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

18

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

19

*

20

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

12

13

14

*

15

* This file is part of Mandos.

16

*

17

* 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

20

* (at your option) any later version.

21

*

22

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

21

23

* WITHOUT ANY WARRANTY; without even the implied warranty of

22

24

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

23

25

* General Public License for more details.

24

26

*

25

27

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

26

* along with this program. If not, see

27

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

28

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

28

29

*

29

30

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

30

31

*/

37

38

#define _FILE_OFFSET_BITS 64

38

39

#endif /* not _FILE_OFFSET_BITS */

39

40

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

41

42

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

43

stdout, ferror() */

44

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

45

#include <stddef.h> /* NULL, size_t, ssize_t */

46

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

47

strtof(), abort() */

41

#define _GNU_SOURCE /* program_invocation_short_name,

42

TEMP_FAILURE_RETRY(), O_CLOEXEC,

43

scandirat(), asprintf() */

48

44

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

49

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

50

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

51

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

52

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

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

61

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

62

*/

63

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

45

#include <argp.h> /* argp_program_version,

46

argp_program_bug_address,

47

struct argp_option,

48

struct argp_state, argp_error(),

49

argp_state_help,

50

ARGP_HELP_STD_HELP,

51

ARGP_HELP_EXIT_ERR,

52

ARGP_HELP_EXIT_OK, ARGP_HELP_USAGE,

53

argp_err_exit_status,

54

ARGP_ERR_UNKNOWN, struct argp,

55

argp_parse(), ARGP_IN_ORDER,

56

ARGP_NO_HELP */

57

#include <stddef.h> /* NULL, size_t */

58

#include <sys/types.h> /* uid_t, gid_t, sig_atomic_t,

59

seteuid(), setuid(), pid_t,

60

setgid(), getuid(), getgid() */

61

#include <unistd.h> /* uid_t, gid_t, TEMP_FAILURE_RETRY(),

62

seteuid(), setuid(), close(),

63

ssize_t, read(), fork(), setgid(),

64

_exit(), dup2(), STDIN_FILENO,

65

STDERR_FILENO, STDOUT_FILENO,

66

fexecve(), write(), getuid(),

67

getgid(), fchown(), symlink(),

68

sleep(), unlinkat(), pause() */

69

#include <netinet/in.h> /* in_port_t, struct sockaddr_in6,

70

sa_family_t, struct sockaddr_in,

71

htons(), IN6_IS_ADDR_LINKLOCAL,

72

INET_ADDRSTRLEN, INET6_ADDRSTRLEN,

73

ntohl(), IPPROTO_IP */

74

#include <time.h> /* struct timespec, clock_gettime(),

75

CLOCK_MONOTONIC, time_t, struct tm,

76

gmtime_r(), clock_settime(),

77

CLOCK_REALTIME, nanosleep() */

78

#include <errno.h> /* errno,

79

program_invocation_short_name,

80

EINTR, EINVAL, ENETUNREACH,

81

EHOSTUNREACH, ECONNREFUSED, EPROTO,

82

EIO, ENOENT, ENXIO, error_t,

83

ENOMEM, EISDIR, ENOTEMPTY */

84

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

85

vfprintf(), off_t, SEEK_SET,

86

stdout, fwrite(), ferror(),

87

fflush(), asprintf() */

88

#include <stdarg.h> /* va_list, va_start(), vfprintf() */

89

#include <stdlib.h> /* realloc(), free(), malloc(),

90

getenv(), EXIT_FAILURE, setenv(),

91

EXIT_SUCCESS, strtof(), strtod(),

92

srand(), mkdtemp(), abort() */

93

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

94

strerror(), strncpy(), strspn(),

95

memcpy(), strrchr(), strchr(),

96

strsignal() */

97

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

98

O_PATH, O_CLOEXEC, openat(),

99

O_NOFOLLOW, AT_REMOVEDIR */

100

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

101

#include <sys/stat.h> /* struct stat, fstat(), fstatat(),

102

S_ISREG(), S_IXUSR, S_IXGRP,

103

S_IXOTH, lstat() */

104

#include <net/if.h> /* IF_NAMESIZE, if_indextoname(),

105

if_nametoindex(), SIOCGIFFLAGS,

106

IFF_LOOPBACK, IFF_POINTOPOINT,

107

IFF_BROADCAST, IFF_NOARP, IFF_UP,

108

IFF_RUNNING, SIOCSIFFLAGS */

109

#include <sysexits.h> /* EX_NOPERM, EX_OSERR,

110

EX_UNAVAILABLE, EX_USAGE */

111

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

112

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

113

WEXITSTATUS(), WIFSIGNALED(),

114

WTERMSIG() */

115

#include <signal.h> /* kill(), SIGTERM, struct sigaction,

116

SIG_DFL, sigemptyset(),

117

sigaddset(), SIGINT, SIGHUP,

118

SIG_IGN, raise() */

119

#include <sys/socket.h> /* struct sockaddr_storage, AF_INET6,

120

PF_INET6, AF_INET, PF_INET,

121

socket(), SOCK_STREAM,

122

SOCK_CLOEXEC, struct sockaddr,

123

connect(), SOCK_DGRAM */

124

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

125

argz_delete(), argz_stringify(),

126

argz_add(), argz_count() */

127

#include <inttypes.h> /* PRIuMAX, uintmax_t, uint32_t,

128

PRIdMAX, PRIu16, intmax_t,

64

129

strtoimax() */

65

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

66

program_invocation_short_name */

67

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

68

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

69

SIOCSIFFLAGS, if_indextoname(),

70

if_nametoindex(), IF_NAMESIZE */

71

#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,

72

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

73

*/

74

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

75

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

76

setgid(), pause(), _exit(),

77

unlinkat() */

78

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

79

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

80

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

81

argp_state, struct argp,

82

argp_parse(), ARGP_KEY_ARG,

83

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

84

#include <signal.h> /* sigemptyset(), sigaddset(),

85

sigaction(), SIGTERM, sig_atomic_t,

86

raise() */

87

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

88

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

89

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

90

WEXITSTATUS(), WTERMSIG() */

91

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

92

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

93

argz_delete(), argz_append(),

94

argz_stringify(), argz_add(),

95

argz_count() */

130

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

131

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

96

132

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

97

133

EAI_SYSTEM, gai_strerror() */

134

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

135

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

136

alphasort(), scandir() */

137

#include <limits.h> /* INT_MAX */

98

138

99

139

#ifdef __linux__

100

140

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

113

153

114

154

/* GnuTLS */

115

155

#include <gnutls/gnutls.h> /* All GnuTLS types, constants and

116

functions:

117

gnutls_*

118

init_gnutls_session(),

119

GNUTLS_* */

156

functions: gnutls_*, GNUTLS_* */

157

#if GNUTLS_VERSION_NUMBER < 0x030600

120

158

#include <gnutls/openpgp.h>

121

159

/* gnutls_certificate_set_openpgp_key_file(),

122

160

GNUTLS_OPENPGP_FMT_BASE64 */

161

#elif GNUTLS_VERSION_NUMBER >= 0x030606

162

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

163

GNUTLS_PKCS_NULL_PASSWORD */

164

#endif

123

165

124

166

/* GPGME */

125

167

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

126

168

functions:

127

gpgme_*

128

GPGME_PROTOCOL_OpenPGP,

129

GPG_ERR_NO_* */

169

gpgme_*, GPG_ERR_NO_*,

170

GPGME_IMPORT_*

171

GPGME_PROTOCOL_OpenPGP */

130

172

131

173

#define BUFFER_SIZE 256

132

174

133

175

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

134

176

#define SECKEY "seckey.txt"

135

177

#define PUBKEY "pubkey.txt"

178

#define TLS_PRIVKEY "tls-privkey.pem"

179

#define TLS_PUBKEY "tls-pubkey.pem"

136

180

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

137

181

138

182

bool debug = false;

266

310

return true;

267

311

}

268

312

313

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

314

__attribute__((warn_unused_result))

315

int raise_privileges(void){

316

int old_errno = errno;

317

int ret = 0;

318

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

319

ret = errno;

320

}

321

errno = old_errno;

322

return ret;

323

}

324

325

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

326

__attribute__((warn_unused_result))

327

int raise_privileges_permanently(void){

328

int old_errno = errno;

329

int ret = raise_privileges();

330

if(ret != 0){

331

errno = old_errno;

332

return ret;

333

}

334

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

335

ret = errno;

336

}

337

errno = old_errno;

338

return ret;

339

}

340

341

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

342

__attribute__((warn_unused_result))

343

int lower_privileges(void){

344

int old_errno = errno;

345

int ret = 0;

346

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

347

ret = errno;

348

}

349

errno = old_errno;

350

return ret;

351

}

352

353

/* Lower privileges permanently */

354

__attribute__((warn_unused_result))

355

int lower_privileges_permanently(void){

356

int old_errno = errno;

357

int ret = 0;

358

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

359

ret = errno;

360

}

361

errno = old_errno;

362

return ret;

363

}

364

269

365

/*

270

366

* Initialize GPGME.

271

367

*/

291

387

return false;

292

388

}

293

389

390

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

391

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

392

do {

393

{

394

time_t currtime = time(NULL);

395

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

396

struct tm tm;

397

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

398

perror_plus("gmtime_r");

399

break;

400

}

401

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

402

break;

403

}

404

if(debug){

405

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

406

}

407

} else {

408

if(debug){

409

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

410

}

411

}

412

}

413

struct stat keystat;

414

ret = fstat(fd, &keystat);

415

if(ret != 0){

416

perror_plus("fstat");

417

break;

418

}

419

ret = raise_privileges();

420

if(ret != 0){

421

errno = ret;

422

perror_plus("Failed to raise privileges");

423

break;

424

}

425

if(debug){

426

fprintf_plus(stderr,

427

"Setting system clock to key file mtime");

428

}

429

if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){

430

perror_plus("clock_settime");

431

}

432

ret = lower_privileges();

433

if(ret != 0){

434

errno = ret;

435

perror_plus("Failed to lower privileges");

436

}

437

} while(false);

438

294

439

rc = gpgme_data_new_from_fd(&pgp_data, fd);

295

440

if(rc != GPG_ERR_NO_ERROR){

296

441

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

304

449

gpgme_strsource(rc), gpgme_strerror(rc));

305

450

return false;

306

451

}

452

{

453

gpgme_import_result_t import_result

454

= gpgme_op_import_result(mc->ctx);

455

if((import_result->imported < 1

456

or import_result->not_imported > 0)

457

and import_result->unchanged == 0){

458

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

459

fprintf_plus(stderr,

460

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

461

import_result->considered);

462

fprintf_plus(stderr,

463

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

464

import_result->no_user_id);

465

fprintf_plus(stderr,

466

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

467

import_result->imported);

468

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

469

import_result->imported_rsa);

470

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

471

import_result->unchanged);

472

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

473

import_result->new_user_ids);

474

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

475

import_result->new_sub_keys);

476

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

477

import_result->new_signatures);

478

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

479

import_result->new_revocations);

480

fprintf_plus(stderr,

481

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

482

import_result->secret_read);

483

fprintf_plus(stderr,

484

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

485

import_result->secret_imported);

486

fprintf_plus(stderr,

487

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

488

import_result->secret_unchanged);

489

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

490

import_result->not_imported);

491

for(gpgme_import_status_t import_status

492

= import_result->imports;

493

import_status != NULL;

494

import_status = import_status->next){

495

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

496

import_status->fpr);

497

if(import_status->result != GPG_ERR_NO_ERROR){

498

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

499

gpgme_strsource(import_status->result),

500

gpgme_strerror(import_status->result));

501

}

502

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

503

fprintf_plus(stderr,

504

import_status->status & GPGME_IMPORT_NEW

505

? "The key was new.\n"

506

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

507

fprintf_plus(stderr,

508

import_status->status & GPGME_IMPORT_UID

509

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

510

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

511

fprintf_plus(stderr,

512

import_status->status & GPGME_IMPORT_SIG

513

? "The key contained new signatures.\n"

514

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

515

fprintf_plus(stderr,

516

import_status->status & GPGME_IMPORT_SUBKEY

517

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

518

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

519

fprintf_plus(stderr,

520

import_status->status & GPGME_IMPORT_SECRET

521

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

522

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

523

}

524

return false;

525

}

526

}

307

527

308

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

528

ret = close(fd);

309

529

if(ret == -1){

310

530

perror_plus("close");

311

531

}

350

570

/* Create new GPGME "context" */

351

571

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

352

572

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));

573

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

574

gpgme_strsource(rc), gpgme_strerror(rc));

356

575

return false;

357

576

}

358

577

394

613

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

395

614

rc = gpgme_data_new(&dh_plain);

396

615

if(rc != GPG_ERR_NO_ERROR){

397

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

398

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

616

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

399

617

gpgme_strsource(rc), gpgme_strerror(rc));

400

618

gpgme_data_release(dh_crypto);

401

619

return -1;

414

632

if(result == NULL){

415

633

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

416

634

} 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);

635

if(result->unsupported_algorithm != NULL) {

636

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

637

result->unsupported_algorithm);

638

}

639

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

640

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

421

641

if(result->file_name != NULL){

422

642

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

423

643

}

424

gpgme_recipient_t recipient;

425

recipient = result->recipients;

426

while(recipient != NULL){

644

645

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

646

r = r->next){

427

647

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);

648

gpgme_pubkey_algo_name(r->pubkey_algo));

649

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

431

650

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

432

recipient->status == GPG_ERR_NO_SECKEY

433

? "No" : "Yes");

434

recipient = recipient->next;

651

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

435

652

}

436

653

}

437

654

}

493

710

return plaintext_length;

494

711

}

495

712

713

__attribute__((warn_unused_result, const))

714

static const char *safe_string(const char *str){

715

if(str == NULL)

716

return "(unknown)";

717

return str;

718

}

719

496

720

__attribute__((warn_unused_result))

497

721

static const char *safer_gnutls_strerror(int value){

498

722

const char *ret = gnutls_strerror(value);

499

if(ret == NULL)

500

ret = "(unknown)";

501

return ret;

723

return safe_string(ret);

502

724

}

503

725

504

726

/* GnuTLS log function callback */

508

730

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

509

731

}

510

732

511

__attribute__((nonnull, warn_unused_result))

733

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

512

734

static int init_gnutls_global(const char *pubkeyfilename,

513

735

const char *seckeyfilename,

736

const char *dhparamsfilename,

514

737

mandos_context *mc){

515

738

int ret;

516

739

518

741

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

519

742

}

520

743

521

ret = gnutls_global_init();

522

if(ret != GNUTLS_E_SUCCESS){

523

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

524

safer_gnutls_strerror(ret));

525

return -1;

526

}

527

528

744

if(debug){

529

745

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

530

746

* - GnuTLS manual

538

754

if(ret != GNUTLS_E_SUCCESS){

539

755

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

540

756

safer_gnutls_strerror(ret));

541

gnutls_global_deinit();

542

757

return -1;

543

758

}

544

759

545

760

if(debug){

546

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

547

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

761

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

762

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

548

763

pubkeyfilename,

549

764

seckeyfilename);

550

765

}

551

766

767

#if GNUTLS_VERSION_NUMBER >= 0x030606

768

ret = gnutls_certificate_set_rawpk_key_file

769

(mc->cred, pubkeyfilename, seckeyfilename,

770

GNUTLS_X509_FMT_PEM, /* format */

771

NULL, /* pass */

772

/* key_usage */

773

GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,

774

NULL, /* names */

775

0, /* names_length */

776

/* privkey_flags */

777

GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,

778

0); /* pkcs11_flags */

779

#elif GNUTLS_VERSION_NUMBER < 0x030600

552

780

ret = gnutls_certificate_set_openpgp_key_file

553

781

(mc->cred, pubkeyfilename, seckeyfilename,

554

782

GNUTLS_OPENPGP_FMT_BASE64);

783

#else

784

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

785

#endif

555

786

if(ret != GNUTLS_E_SUCCESS){

556

787

fprintf_plus(stderr,

557

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

788

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

558

789

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

559

790

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

560

791

safer_gnutls_strerror(ret));

569

800

safer_gnutls_strerror(ret));

570

801

goto globalfail;

571

802

}

572

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

573

if(ret != GNUTLS_E_SUCCESS){

574

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

575

safer_gnutls_strerror(ret));

576

goto globalfail;

577

}

578

579

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

803

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

804

if(dhparamsfilename != NULL){

805

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

806

do {

807

int dhpfile = open(dhparamsfilename, O_RDONLY);

808

if(dhpfile == -1){

809

perror_plus("open");

810

dhparamsfilename = NULL;

811

break;

812

}

813

size_t params_capacity = 0;

814

while(true){

815

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

816

(size_t)params.size,

817

(size_t)params_capacity);

818

if(params_capacity == 0){

819

perror_plus("incbuffer");

820

free(params.data);

821

params.data = NULL;

822

dhparamsfilename = NULL;

823

break;

824

}

825

ssize_t bytes_read = read(dhpfile,

826

params.data + params.size,

827

BUFFER_SIZE);

828

/* EOF */

829

if(bytes_read == 0){

830

break;

831

}

832

/* check bytes_read for failure */

833

if(bytes_read < 0){

834

perror_plus("read");

835

free(params.data);

836

params.data = NULL;

837

dhparamsfilename = NULL;

838

break;

839

}

840

params.size += (unsigned int)bytes_read;

841

}

842

ret = close(dhpfile);

843

if(ret == -1){

844

perror_plus("close");

845

}

846

if(params.data == NULL){

847

dhparamsfilename = NULL;

848

}

849

if(dhparamsfilename == NULL){

850

break;

851

}

852

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

853

GNUTLS_X509_FMT_PEM);

854

if(ret != GNUTLS_E_SUCCESS){

855

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

856

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

857

safer_gnutls_strerror(ret));

858

dhparamsfilename = NULL;

859

}

860

free(params.data);

861

} while(false);

862

}

863

if(dhparamsfilename == NULL){

864

if(mc->dh_bits == 0){

865

#if GNUTLS_VERSION_NUMBER < 0x030600

866

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

867

/* Try to read the private key file */

868

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

869

do {

870

int secfile = open(seckeyfilename, O_RDONLY);

871

if(secfile == -1){

872

perror_plus("open");

873

break;

874

}

875

size_t buffer_capacity = 0;

876

while(true){

877

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

878

(size_t)buffer.size,

879

(size_t)buffer_capacity);

880

if(buffer_capacity == 0){

881

perror_plus("incbuffer");

882

free(buffer.data);

883

buffer.data = NULL;

884

break;

885

}

886

ssize_t bytes_read = read(secfile,

887

buffer.data + buffer.size,

888

BUFFER_SIZE);

889

/* EOF */

890

if(bytes_read == 0){

891

break;

892

}

893

/* check bytes_read for failure */

894

if(bytes_read < 0){

895

perror_plus("read");

896

free(buffer.data);

897

buffer.data = NULL;

898

break;

899

}

900

buffer.size += (unsigned int)bytes_read;

901

}

902

close(secfile);

903

} while(false);

904

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

905

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

906

if(buffer.data != NULL){

907

{

908

gnutls_openpgp_privkey_t privkey = NULL;

909

ret = gnutls_openpgp_privkey_init(&privkey);

910

if(ret != GNUTLS_E_SUCCESS){

911

fprintf_plus(stderr, "Error initializing OpenPGP key"

912

" structure: %s",

913

safer_gnutls_strerror(ret));

914

free(buffer.data);

915

buffer.data = NULL;

916

} else {

917

ret = gnutls_openpgp_privkey_import

918

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

919

if(ret != GNUTLS_E_SUCCESS){

920

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

921

safer_gnutls_strerror(ret));

922

privkey = NULL;

923

}

924

free(buffer.data);

925

buffer.data = NULL;

926

if(privkey != NULL){

927

/* Use private key to suggest an appropriate

928

sec_param */

929

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

930

gnutls_openpgp_privkey_deinit(privkey);

931

if(debug){

932

fprintf_plus(stderr, "This OpenPGP key implies using"

933

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

934

safe_string(gnutls_sec_param_get_name

935

(sec_param)));

936

}

937

}

938

}

939

}

940

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

941

/* Err on the side of caution */

942

sec_param = GNUTLS_SEC_PARAM_ULTRA;

943

if(debug){

944

fprintf_plus(stderr, "Falling back to security parameter"

945

" \"%s\"\n",

946

safe_string(gnutls_sec_param_get_name

947

(sec_param)));

948

}

949

}

950

}

951

unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

952

if(uret != 0){

953

mc->dh_bits = uret;

954

if(debug){

955

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

956

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

957

safe_string(gnutls_sec_param_get_name

958

(sec_param)),

959

mc->dh_bits);

960

}

961

} else {

962

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

963

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

964

safe_string(gnutls_sec_param_get_name

965

(sec_param)),

966

safer_gnutls_strerror(ret));

967

goto globalfail;

968

}

969

#endif

970

} else { /* dh_bits != 0 */

971

if(debug){

972

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

973

mc->dh_bits);

974

}

975

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

976

if(ret != GNUTLS_E_SUCCESS){

977

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

978

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

979

safer_gnutls_strerror(ret));

980

goto globalfail;

981

}

982

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

983

}

984

}

580

985

581

986

return 0;

582

987

583

988

globalfail:

584

989

585

990

gnutls_certificate_free_credentials(mc->cred);

586

gnutls_global_deinit();

587

991

gnutls_dh_params_deinit(mc->dh_params);

588

992

return -1;

589

993

}

594

998

int ret;

595

999

/* GnuTLS session creation */

596

1000

do {

597

ret = gnutls_init(session, GNUTLS_SERVER);

1001

ret = gnutls_init(session, (GNUTLS_SERVER

1002

#if GNUTLS_VERSION_NUMBER >= 0x030506

1003

| GNUTLS_NO_TICKETS

1004

#endif

1005

#if GNUTLS_VERSION_NUMBER >= 0x030606

1006

| GNUTLS_ENABLE_RAWPK

1007

#endif

1008

));

598

1009

if(quit_now){

599

1010

return -1;

600

1011

}

641

1052

/* ignore client certificate if any. */

642

1053

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

643

1054

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

645

646

1055

return 0;

647

1056

}

648

1057

650

1059

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

651

1060

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

652

1061

653

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

654

__attribute__((warn_unused_result))

655

error_t raise_privileges(void){

656

error_t old_errno = errno;

657

error_t ret_errno = 0;

658

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

659

ret_errno = errno;

660

}

661

errno = old_errno;

662

return ret_errno;

663

}

664

665

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

666

__attribute__((warn_unused_result))

667

error_t raise_privileges_permanently(void){

668

error_t old_errno = errno;

669

error_t ret_errno = raise_privileges();

670

if(ret_errno != 0){

671

errno = old_errno;

672

return ret_errno;

673

}

674

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

675

ret_errno = errno;

676

}

677

errno = old_errno;

678

return ret_errno;

679

}

680

681

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

682

__attribute__((warn_unused_result))

683

error_t lower_privileges(void){

684

error_t old_errno = errno;

685

error_t ret_errno = 0;

686

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

687

ret_errno = errno;

688

}

689

errno = old_errno;

690

return ret_errno;

691

}

692

693

/* Lower privileges permanently */

694

__attribute__((warn_unused_result))

695

error_t lower_privileges_permanently(void){

696

error_t old_errno = errno;

697

error_t ret_errno = 0;

698

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

699

ret_errno = errno;

700

}

701

errno = old_errno;

702

return ret_errno;

703

}

704

705

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

1062

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

706

1063

__attribute__((nonnull, warn_unused_result))

707

static bool add_remove_local_route(const bool add,

1064

static bool add_delete_local_route(const bool add,

708

1065

const char *address,

709

1066

AvahiIfIndex if_index){

710

1067

int ret;

711

1068

char helper[] = "mandos-client-iprouteadddel";

712

1069

char add_arg[] = "add";

713

char remove_arg[] = "remove";

1070

char delete_arg[] = "delete";

1071

char debug_flag[] = "--debug";

714

1072

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

715

1073

if(pluginhelperdir == NULL){

716

1074

if(debug){

745

1103

ret = setgid(0);

746

1104

if(ret == -1){

747

1105

perror_plus("setgid");

1106

close(devnull);

748

1107

_exit(EX_NOPERM);

749

1108

}

750

1109

/* Reset supplementary groups */

752

1111

ret = setgroups(0, NULL);

753

1112

if(ret == -1){

754

1113

perror_plus("setgroups");

1114

close(devnull);

755

1115

_exit(EX_NOPERM);

756

1116

}

757

1117

}

758

1118

ret = dup2(devnull, STDIN_FILENO);

759

1119

if(ret == -1){

760

1120

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

1121

close(devnull);

761

1122

_exit(EX_OSERR);

762

1123

}

763

1124

ret = close(devnull);

764

1125

if(ret == -1){

765

1126

perror_plus("close");

766

_exit(EX_OSERR);

767

1127

}

768

1128

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

769

1129

if(ret == -1){

775

1135

| O_DIRECTORY

776

1136

| O_PATH

777

1137

| O_CLOEXEC));

1138

if(helperdir_fd == -1){

1139

perror_plus("open");

1140

_exit(EX_UNAVAILABLE);

1141

}

778

1142

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

779

1143

helper, O_RDONLY));

780

TEMP_FAILURE_RETRY(close(helperdir_fd));

1144

if(helper_fd == -1){

1145

perror_plus("openat");

1146

close(helperdir_fd);

1147

_exit(EX_UNAVAILABLE);

1148

}

1149

close(helperdir_fd);

781

1150

#ifdef __GNUC__

782

1151

#pragma GCC diagnostic push

783

1152

#pragma GCC diagnostic ignored "-Wcast-qual"

784

1153

#endif

785

1154

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

786

{ helper, add ? add_arg : remove_arg, (char *)address,

787

interface, NULL }, environ) == -1){

1155

{ helper, add ? add_arg : delete_arg, (char *)address,

1156

interface, debug ? debug_flag : NULL, NULL },

1157

environ) == -1){

788

1158

#ifdef __GNUC__

789

1159

#pragma GCC diagnostic pop

790

1160

#endif

794

1164

}

795

1165

if(pid == -1){

796

1166

perror_plus("fork");

1167

close(devnull);

797

1168

return false;

798

1169

}

1170

ret = close(devnull);

1171

if(ret == -1){

1172

perror_plus("close");

1173

}

799

1174

int status;

800

1175

pid_t pret = -1;

801

1176

errno = 0;

842

1217

__attribute__((nonnull, warn_unused_result))

843

1218

static bool add_local_route(const char *address,

844

1219

AvahiIfIndex if_index){

845

return add_remove_local_route(true, address, if_index);

1220

if(debug){

1221

fprintf_plus(stderr, "Adding route to %s\n", address);

1222

}

1223

return add_delete_local_route(true, address, if_index);

846

1224

}

847

1225

848

1226

__attribute__((nonnull, warn_unused_result))

849

static bool remove_local_route(const char *address,

1227

static bool delete_local_route(const char *address,

850

1228

AvahiIfIndex if_index){

851

return add_remove_local_route(false, address, if_index);

1229

if(debug){

1230

fprintf_plus(stderr, "Removing route to %s\n", address);

1231

}

1232

return add_delete_local_route(false, address, if_index);

852

1233

}

853

1234

854

1235

/* Called when a Mandos server is found */

895

1276

bool match = false;

896

1277

{

897

1278

char *interface = NULL;

898

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

899

interface))){

1279

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

1280

mc->interfaces_size,

1281

interface))){

900

1282

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

901

1283

match = true;

902

1284

break;

944

1326

goto mandos_end;

945

1327

}

946

1328

947

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

948

1329

if(af == AF_INET6){

949

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

950

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

1330

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

1331

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

1332

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

951

1333

} else { /* IPv4 */

952

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

953

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

1334

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

1335

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

1336

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

954

1337

}

955

1338

if(ret < 0 ){

956

1339

int e = errno;

1035

1418

sizeof(struct sockaddr_in));

1036

1419

}

1037

1420

if(ret < 0){

1038

if(errno == ENETUNREACH

1421

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

1039

1422

and if_index != AVAHI_IF_UNSPEC

1040

1423

and connect_to == NULL

1041

1424

and not route_added and

1054

1437

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

1055

1438

1056

1439

Avahi bug reference:

1057

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

1440

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

1058

1441

https://bugs.debian.org/587961

1059

1442

*/

1443

if(debug){

1444

fprintf_plus(stderr, "Mandos server unreachable, trying"

1445

" direct route\n");

1446

}

1060

1447

int e = errno;

1061

1448

route_added = add_local_route(ip, if_index);

1062

1449

if(route_added){

1236

1623

&decrypted_buffer, mc);

1237

1624

if(decrypted_buffer_size >= 0){

1238

1625

1626

clearerr(stdout);

1239

1627

written = 0;

1240

1628

while(written < (size_t) decrypted_buffer_size){

1241

1629

if(quit_now){

1257

1645

}

1258

1646

written += (size_t)ret;

1259

1647

}

1648

ret = fflush(stdout);

1649

if(ret != 0){

1650

int e = errno;

1651

if(debug){

1652

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

1653

strerror(errno));

1654

}

1655

errno = e;

1656

goto mandos_end;

1657

}

1260

1658

retval = 0;

1261

1659

}

1262

1660

}

1266

1664

mandos_end:

1267

1665

{

1268

1666

if(route_added){

1269

if(not remove_local_route(ip, if_index)){

1270

fprintf_plus(stderr, "Failed to remove local route to %s on"

1667

if(not delete_local_route(ip, if_index)){

1668

fprintf_plus(stderr, "Failed to delete local route to %s on"

1271

1669

" interface %d", ip, if_index);

1272

1670

}

1273

1671

}

1275

1673

free(decrypted_buffer);

1276

1674

free(buffer);

1277

1675

if(tcp_sd >= 0){

1278

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

1676

ret = close(tcp_sd);

1279

1677

}

1280

1678

if(ret == -1){

1281

1679

if(e == 0){

1293

1691

return retval;

1294

1692

}

1295

1693

1296

__attribute__((nonnull))

1297

1694

static void resolve_callback(AvahiSServiceResolver *r,

1298

1695

AvahiIfIndex interface,

1299

1696

AvahiProtocol proto,

1436

1833

__attribute__((nonnull, warn_unused_result))

1437

1834

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

1438

1835

int ret;

1439

error_t ret_errno;

1836

int old_errno;

1440

1837

1441

1838

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

1442

1839

if(s < 0){

1443

ret_errno = errno;

1840

old_errno = errno;

1444

1841

perror_plus("socket");

1445

errno = ret_errno;

1842

errno = old_errno;

1446

1843

return false;

1447

1844

}

1448

strcpy(ifr->ifr_name, ifname);

1845

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

1846

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

1449

1847

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1450

1848

if(ret == -1){

1451

1849

if(debug){

1452

ret_errno = errno;

1850

old_errno = errno;

1453

1851

perror_plus("ioctl SIOCGIFFLAGS");

1454

errno = ret_errno;

1852

errno = old_errno;

1853

}

1854

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

1855

old_errno = errno;

1856

perror_plus("close");

1857

errno = old_errno;

1455

1858

}

1456

1859

return false;

1457

1860

}

1861

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

1862

old_errno = errno;

1863

perror_plus("close");

1864

errno = old_errno;

1865

}

1458

1866

return true;

1459

1867

}

1460

1868

1721

2129

return;

1722

2130

}

1723

2131

}

1724

#ifdef __GLIBC__

1725

#if __GLIBC_PREREQ(2, 15)

2132

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

2133

if(devnull == -1){

2134

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

2135

return;

2136

}

1726

2137

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

1727

2138

runnable_hook, alphasort);

1728

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

1729

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

1730

alphasort);

1731

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

1732

#else /* not __GLIBC__ */

1733

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

1734

alphasort);

1735

#endif /* not __GLIBC__ */

1736

2139

if(numhooks == -1){

1737

2140

perror_plus("scandir");

2141

close(devnull);

1738

2142

return;

1739

2143

}

1740

2144

struct dirent *direntry;

1741

2145

int ret;

1742

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

1743

if(devnull == -1){

1744

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

1745

return;

1746

}

1747

2146

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

1748

2147

direntry = direntries[i];

1749

2148

if(debug){

1813

2212

_exit(EX_OSERR);

1814

2213

}

1815

2214

}

1816

int hook_fd = TEMP_FAILURE_RETRY(openat(hookdir_fd,

1817

direntry->d_name,

1818

O_RDONLY));

2215

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

2216

direntry->d_name,

2217

O_RDONLY));

1819

2218

if(hook_fd == -1){

1820

2219

perror_plus("openat");

1821

2220

_exit(EXIT_FAILURE);

1822

2221

}

1823

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

2222

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

1824

2223

perror_plus("close");

1825

2224

_exit(EXIT_FAILURE);

1826

2225

}

1884

2283

free(direntry);

1885

2284

}

1886

2285

free(direntries);

1887

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

2286

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

1888

2287

perror_plus("close");

1889

2288

} else {

1890

2289

hookdir_fd = -1;

1893

2292

}

1894

2293

1895

2294

__attribute__((nonnull, warn_unused_result))

1896

error_t bring_up_interface(const char *const interface,

1897

const float delay){

1898

error_t old_errno = errno;

2295

int bring_up_interface(const char *const interface,

2296

const float delay){

2297

int old_errno = errno;

1899

2298

int ret;

1900

2299

struct ifreq network;

1901

2300

unsigned int if_index = if_nametoindex(interface);

1911

2310

}

1912

2311

1913

2312

if(not interface_is_up(interface)){

1914

error_t ret_errno = 0, ioctl_errno = 0;

2313

int ret_errno = 0;

2314

int ioctl_errno = 0;

1915

2315

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

1916

2316

ret_errno = errno;

1917

2317

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

1930

2330

}

1931

2331

1932

2332

if(quit_now){

1933

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

2333

ret = close(sd);

1934

2334

if(ret == -1){

1935

2335

perror_plus("close");

1936

2336

}

1986

2386

}

1987

2387

1988

2388

/* Close the socket */

1989

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

2389

ret = close(sd);

1990

2390

if(ret == -1){

1991

2391

perror_plus("close");

1992

2392

}

2004

2404

2005

2405

/* Sleep checking until interface is running.

2006

2406

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

2007

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

2407

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

2008

2408

if(interface_is_running(interface)){

2009

2409

break;

2010

2410

}

2020

2420

}

2021

2421

2022

2422

__attribute__((nonnull, warn_unused_result))

2023

error_t take_down_interface(const char *const interface){

2024

error_t old_errno = errno;

2423

int take_down_interface(const char *const interface){

2424

int old_errno = errno;

2025

2425

struct ifreq network;

2026

2426

unsigned int if_index = if_nametoindex(interface);

2027

2427

if(if_index == 0){

2030

2430

return ENXIO;

2031

2431

}

2032

2432

if(interface_is_up(interface)){

2033

error_t ret_errno = 0, ioctl_errno = 0;

2433

int ret_errno = 0;

2434

int ioctl_errno = 0;

2034

2435

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

2035

2436

ret_errno = errno;

2036

2437

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

2074

2475

}

2075

2476

2076

2477

/* Close the socket */

2077

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

2478

int ret = close(sd);

2078

2479

if(ret == -1){

2079

2480

perror_plus("close");

2080

2481

}

2095

2496

}

2096

2497

2097

2498

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

2098

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

2099

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

2100

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

2101

.interfaces = NULL, .interfaces_size = 0 };

2499

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

2500

#if GNUTLS_VERSION_NUMBER >= 0x030606

2501

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

2502

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

2503

":%PROFILE_ULTRA",

2504

#elif GNUTLS_VERSION_NUMBER < 0x030600

2505

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

2506

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

2507

#else

2508

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

2509

#endif

2510

.current_server = NULL, .interfaces = NULL,

2511

.interfaces_size = 0 };

2102

2512

AvahiSServiceBrowser *sb = NULL;

2103

2513

error_t ret_errno;

2104

2514

int ret;

2113

2523

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2114

2524

const char *seckey = PATHDIR "/" SECKEY;

2115

2525

const char *pubkey = PATHDIR "/" PUBKEY;

2526

#if GNUTLS_VERSION_NUMBER >= 0x030606

2527

const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;

2528

const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;

2529

#endif

2530

const char *dh_params_file = NULL;

2116

2531

char *interfaces_hooks = NULL;

2117

2532

2118

2533

bool gnutls_initialized = false;

2165

2580

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

2166

2581

.arg = "FILE",

2167

2582

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

2168

.group = 2 },

2583

.group = 1 },

2584

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

2585

.arg = "FILE",

2586

#if GNUTLS_VERSION_NUMBER >= 0x030606

2587

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

2588

#else

2589

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

2590

#endif

2591

.group = 1 },

2592

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

2593

.arg = "FILE",

2594

#if GNUTLS_VERSION_NUMBER >= 0x030606

2595

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

2596

#else

2597

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

2598

#endif

2599

.group = 1 },

2169

2600

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

2170

2601

.arg = "BITS",

2171

2602

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

2172

2603

" Diffie-Hellman key exchange",

2173

2604

.group = 2 },

2605

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

2606

.arg = "FILE",

2607

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

2608

" for the Diffie-Hellman key exchange",

2609

.group = 2 },

2174

2610

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

2175

2611

.arg = "STRING",

2176

2612

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

2222

2658

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

2223

2659

pubkey = arg;

2224

2660

break;

2661

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

2662

#if GNUTLS_VERSION_NUMBER >= 0x030606

2663

tls_privkey = arg;

2664

#endif

2665

break;

2666

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

2667

#if GNUTLS_VERSION_NUMBER >= 0x030606

2668

tls_pubkey = arg;

2669

#endif

2670

break;

2225

2671

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

2226

2672

errno = 0;

2227

2673

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

2231

2677

}

2232

2678

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

2233

2679

break;

2680

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

2681

dh_params_file = arg;

2682

break;

2234

2683

case 130: /* --priority */

2235

2684

mc.priority = arg;

2236

2685

break;

2259

2708

argp_state_help(state, state->out_stream,

2260

2709

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

2261

2710

& ~(unsigned int)ARGP_HELP_EXIT_OK);

2711

__builtin_unreachable();

2262

2712

case -3: /* --usage */

2263

2713

argp_state_help(state, state->out_stream,

2264

2714

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2715

__builtin_unreachable();

2265

2716

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

2266

2717

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

2267

2718

exit(argp_err_exit_status);

2276

2727

.args_doc = "",

2277

2728

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

2278

2729

" passwords from a Mandos server" };

2279

ret = argp_parse(&argp, argc, argv,

2280

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2281

switch(ret){

2730

ret_errno = argp_parse(&argp, argc, argv,

2731

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2732

switch(ret_errno){

2282

2733

case 0:

2283

2734

break;

2284

2735

case ENOMEM:

2285

2736

default:

2286

errno = ret;

2737

errno = ret_errno;

2287

2738

perror_plus("argp_parse");

2288

2739

exitcode = EX_OSERR;

2289

2740

goto end;

2294

2745

}

2295

2746

2296

2747

{

2297

/* Work around Debian bug #633582:

2298

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

2299

2300

2748

/* Re-raise privileges */

2301

ret_errno = raise_privileges();

2302

if(ret_errno != 0){

2303

errno = ret_errno;

2749

ret = raise_privileges();

2750

if(ret != 0){

2751

errno = ret;

2304

2752

perror_plus("Failed to raise privileges");

2305

2753

} else {

2306

2754

struct stat st;

2307

2755

2756

/* Work around Debian bug #633582:

2757

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

2758

2308

2759

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

2309

2760

int seckey_fd = open(seckey, O_RDONLY);

2310

2761

if(seckey_fd == -1){

2322

2773

}

2323

2774

}

2324

2775

}

2325

TEMP_FAILURE_RETRY(close(seckey_fd));

2776

close(seckey_fd);

2326

2777

}

2327

2778

}

2328

2779

2343

2794

}

2344

2795

}

2345

2796

}

2346

TEMP_FAILURE_RETRY(close(pubkey_fd));

2347

}

2348

}

2349

2797

close(pubkey_fd);

2798

}

2799

}

2800

2801

if(dh_params_file != NULL

2802

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

2803

int dhparams_fd = open(dh_params_file, O_RDONLY);

2804

if(dhparams_fd == -1){

2805

perror_plus("open");

2806

} else {

2807

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

2808

if(ret == -1){

2809

perror_plus("fstat");

2810

} else {

2811

if(S_ISREG(st.st_mode)

2812

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

2813

ret = fchown(dhparams_fd, uid, gid);

2814

if(ret == -1){

2815

perror_plus("fchown");

2816

}

2817

}

2818

}

2819

close(dhparams_fd);

2820

}

2821

}

2822

2823

/* Work around Debian bug #981302

2824

<https://bugs.debian.org/981302> */

2825

if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){

2826

ret = symlink("/proc/self/fd", "/dev/fd");

2827

if(ret == -1){

2828

perror_plus("Failed to create /dev/fd symlink");

2829

}

2830

}

2831

2350

2832

/* Lower privileges */

2351

ret_errno = lower_privileges();

2352

if(ret_errno != 0){

2353

errno = ret_errno;

2833

ret = lower_privileges();

2834

if(ret != 0){

2835

errno = ret;

2354

2836

perror_plus("Failed to lower privileges");

2355

2837

}

2356

2838

}

2526

3008

errno = bring_up_interface(interface, delay);

2527

3009

if(not interface_was_up){

2528

3010

if(errno != 0){

2529

perror_plus("Failed to bring up interface");

3011

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

3012

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

2530

3013

} else {

2531

3014

errno = argz_add(&interfaces_to_take_down,

2532

3015

&interfaces_to_take_down_size,

2555

3038

goto end;

2556

3039

}

2557

3040

2558

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

3041

#if GNUTLS_VERSION_NUMBER >= 0x030606

3042

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

3043

#elif GNUTLS_VERSION_NUMBER < 0x030600

3044

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

3045

#else

3046

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

3047

#endif

2559

3048

if(ret == -1){

2560

3049

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

2561

3050

exitcode = EX_UNAVAILABLE;

2683

3172

2684

3173

/* Allocate a new server */

2685

3174

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2686

&config, NULL, NULL, &ret_errno);

3175

&config, NULL, NULL, &ret);

2687

3176

2688

3177

/* Free the Avahi configuration data */

2689

3178

avahi_server_config_free(&config);

2692

3181

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

2693

3182

if(mc.server == NULL){

2694

3183

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

2695

avahi_strerror(ret_errno));

3184

avahi_strerror(ret));

2696

3185

exitcode = EX_UNAVAILABLE;

2697

3186

goto end;

2698

3187

}

2733

3222

end:

2734

3223

2735

3224

if(debug){

2736

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

3225

if(signal_received){

3226

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

3227

argv[0], signal_received,

3228

strsignal(signal_received));

3229

} else {

3230

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

3231

}

2737

3232

}

2738

3233

2739

3234

/* Cleanup things */

2750

3245

2751

3246

if(gnutls_initialized){

2752

3247

gnutls_certificate_free_credentials(mc.cred);

2753

gnutls_global_deinit();

2754

3248

gnutls_dh_params_deinit(mc.dh_params);

2755

3249

}

2756

3250

2779

3273

2780

3274

/* Re-raise privileges */

2781

3275

{

2782

ret_errno = raise_privileges();

2783

if(ret_errno != 0){

2784

errno = ret_errno;

3276

ret = raise_privileges();

3277

if(ret != 0){

3278

errno = ret;

2785

3279

perror_plus("Failed to raise privileges");

2786

3280

} else {

2787

3281

2792

3286

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

2793

3287

{

2794

3288

char *interface = NULL;

2795

while((interface=argz_next(interfaces_to_take_down,

2796

interfaces_to_take_down_size,

2797

interface))){

2798

ret_errno = take_down_interface(interface);

2799

if(ret_errno != 0){

2800

errno = ret_errno;

3289

while((interface = argz_next(interfaces_to_take_down,

3290

interfaces_to_take_down_size,

3291

interface))){

3292

ret = take_down_interface(interface);

3293

if(ret != 0){

3294

errno = ret;

2801

3295

perror_plus("Failed to take down interface");

2802

3296

}

2803

3297

}

2808

3302

}

2809

3303

}

2810

3304

2811

ret_errno = lower_privileges_permanently();

2812

if(ret_errno != 0){

2813

errno = ret_errno;

3305

ret = lower_privileges_permanently();

3306

if(ret != 0){

3307

errno = ret;

2814

3308

perror_plus("Failed to lower privileges permanently");

2815

3309

}

2816

3310

}

2818

3312

free(interfaces_to_take_down);

2819

3313

free(interfaces_hooks);

2820

3314

3315

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

3316

uintmax_t level){

3317

struct dirent **direntries = NULL;

3318

int dret;

3319

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

3320

O_RDONLY

3321

| O_NOFOLLOW

3322

| O_DIRECTORY

3323

| O_PATH));

3324

if(dir_fd == -1){

3325

perror_plus("open");

3326

return;

3327

}

3328

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

3329

notdotentries, alphasort);

3330

if(numentries >= 0){

3331

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

3332

if(debug){

3333

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

3334

dirname, direntries[i]->d_name);

3335

}

3336

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

3337

if(dret == -1){

3338

if(errno == EISDIR){

3339

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

3340

AT_REMOVEDIR);

3341

}

3342

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

3343

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

3344

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

3345

/* Recurse only in this special case */

3346

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

3347

dret = 0;

3348

}

3349

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

3350

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

3351

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

3352

}

3353

}

3354

free(direntries[i]);

3355

}

3356

3357

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

3358

free(direntries);

3359

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3360

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

3361

perror_plus("rmdir");

3362

}

3363

} else {

3364

perror_plus("scandirat");

3365

}

3366

close(dir_fd);

3367

}

3368

2821

3369

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

2822

3370

if(tempdir != NULL){

2823

struct dirent **direntries = NULL;

2824

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

2825

| O_NOFOLLOW

2826

| O_DIRECTORY

2827

| O_PATH));

2828

if(tempdir_fd == -1){

2829

perror_plus("open");

2830

} else {

2831

#ifdef __GLIBC__

2832

#if __GLIBC_PREREQ(2, 15)

2833

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

2834

notdotentries, alphasort);

2835

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

2836

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

2837

alphasort);

2838

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

2839

#else /* not __GLIBC__ */

2840

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

2841

alphasort);

2842

#endif /* not __GLIBC__ */

2843

if(numentries >= 0){

2844

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

2845

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

2846

if(ret == -1){

2847

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

2848

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

2849

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

2850

}

2851

free(direntries[i]);

2852

}

2853

2854

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

2855

free(direntries);

2856

if(numentries == -1){

2857

perror_plus("scandir");

2858

}

2859

ret = rmdir(tempdir);

2860

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

2861

perror_plus("rmdir");

2862

}

2863

}

2864

TEMP_FAILURE_RETRY(close(tempdir_fd));

2865

}

3371

clean_dir_at(-1, tempdir, 0);

2866

3372

}

2867

3373

2868

3374

if(quit_now){