/mandos/release : revision 24.1.27

32

#define _LARGEFILE_SOURCE

33

#define _FILE_OFFSET_BITS 64

34

35

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

35

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */

36

37

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

38

stdout, ferror() */

37

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

39

38

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

40

39

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

41

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

42

srand() */

40

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

43

41

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

44

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

45

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

46

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

42

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

43

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

44

SIOCSIFFLAGS */

47

45

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

48

sockaddr_in6, PF_INET6,

49

SOCK_STREAM, INET6_ADDRSTRLEN,

50

uid_t, gid_t */

51

#include <inttypes.h> /* PRIu16 */

46

sockaddr_in6, PF_INET6, SOCK_STREAM, INET6_ADDRSTRLEN */

52

47

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

53

48

struct in6_addr, inet_pton(),

54

49

connect() */

55

#include <assert.h> /* assert() */

56

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

57

#include <time.h> /* time() */

50

#include <assert.h>

51

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

52

#include <time.h>

58

53

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

59

54

SIOCSIFFLAGS, if_indextoname(),

60

55

if_nametoindex(), IF_NAMESIZE */

61

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

62

getuid(), getgid(), setuid(),

63

setgid() */

56

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

64

57

#include <netinet/in.h>

65

58

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

66

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

67

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

68

argp_state, struct argp,

69

argp_parse(), ARGP_KEY_ARG,

70

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

59

#include <iso646.h> /* not */

60

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

61

struct argp_state, struct argp,

62

argp_parse() */

71

63

72

64

/* Avahi */

73

/* All Avahi types, constants and functions

74

Avahi*, avahi_*,

75

AVAHI_* */

76

#include <avahi-core/core.h>

65

#include <avahi-core/core.h> /* AvahiSimplePoll, AvahiServer,

66

AvahiIfIndex */

77

67

#include <avahi-core/lookup.h>

78

#include <avahi-core/log.h>

68

#include <avahi-core/log.h> /* AvahiLogLevel */

79

69

#include <avahi-common/simple-watch.h>

80

70

#include <avahi-common/malloc.h>

81

71

#include <avahi-common/error.h>

82

72

83

73

/* GnuTLS */

84

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

85

functions:

86

gnutls_*

74

#include <gnutls/gnutls.h> /* gnutls_certificate_credentials_t,

75

gnutls_dh_params_t,

76

gnutls_strerror(),

77

gnutls_global_init(),

78

gnutls_global_set_log_level(),

79

gnutls_global_set_log_function(),

80

gnutls_certificate_allocate_credentials(),

81

gnutls_global_deinit(),

82

gnutls_dh_params_init(),

83

gnutls_dh_params_generate(),

84

gnutls_certificate_set_dh_params(),

85

gnutls_certificate_free_credentials(),

86

gnutls_session_t, gnutls_init(),

87

gnutls_priority_set_direct(),

88

gnutls_deinit(),

89

gnutls_credentials_set(),

90

gnutls_certificate_server_set_request(),

91

gnutls_dh_set_prime_bits(),

92

gnutls_transport_set_ptr(),

93

gnutls_transport_ptr_t,

94

gnutls_handshake(),

95

gnutls_record_recv()

96

gnutls_perror(), gnutls_bye(),

87

97

init_gnutls_session(),

88

GNUTLS_* */

89

#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),

90

GNUTLS_OPENPGP_FMT_BASE64 */

98

GNUTLS_E_SUCCESS,

99

GNUTLS_CRD_CERTIFICATE,

100

GNUTLS_CERT_IGNORE,

101

GNUTLS_E_INTERRUPTED,

102

GNUTLS_E_AGAIN,

103

GNUTLS_E_REHANDSHAKE,

104

GNUTLS_SHUT_RDWR, */

105

#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),

106

GNUTLS_OPENPGP_FMT_BASE64 */

91

107

92

108

/* GPGME */

93

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

94

functions:

95

gpgme_*

109

#include <gpgme.h> /* gpgme_data_t, gpgme_ctx_t,

110

gpgme_error_t, gpgme_engine_info_t,

111

gpgme_check_version(),

112

gpgme_engine_check_version(),

113

gpgme_strsource(),

114

gpgme_strerror(),

115

gpgme_get_engine_info(),

116

gpgme_set_engine_info(),

117

gpgme_data_new_from_mem(),

118

gpgme_data_new(), gpgme_new(),

119

gpgme_op_decrypt(),

120

gpgme_decrypt_result_t,

121

gpgme_op_decrypt_result(),

122

gpgme_recipient_t,

123

gpgme_pubkey_algo_name(),

124

gpgme_data_seek(),

125

gpgme_data_read(),

126

gpgme_data_release()

96

127

GPGME_PROTOCOL_OpenPGP,

97

GPG_ERR_NO_* */

128

GPG_ERR_NO_ERROR,

129

GPG_ERR_NO_SECKEY, */

98

130

99

131

#define BUFFER_SIZE 256

100

132

101

133

bool debug = false;

102

134

static const char *keydir = "/conf/conf.d/mandos";

103

135

static const char mandos_protocol_version[] = "1";

104

const char *argp_program_version = "password-request 1.0";

136

const char *argp_program_version = "mandosclient 0.9";

105

137

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

106

138

107

139

/* Used for passing in values through the Avahi callback functions */

214

246

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

215

247

gpgme_strsource(rc), gpgme_strerror(rc));

216

248

plaintext_length = -1;

217

if (debug){

218

gpgme_decrypt_result_t result;

219

result = gpgme_op_decrypt_result(ctx);

220

if (result == NULL){

221

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

222

} else {

223

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

224

result->unsupported_algorithm);

225

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

226

result->wrong_key_usage);

227

if(result->file_name != NULL){

228

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

229

}

230

gpgme_recipient_t recipient;

231

recipient = result->recipients;

232

if(recipient){

233

while(recipient != NULL){

234

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

235

gpgme_pubkey_algo_name(recipient->pubkey_algo));

236

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

237

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

238

recipient->status == GPG_ERR_NO_SECKEY

239

? "No" : "Yes");

240

recipient = recipient->next;

241

}

242

}

243

}

244

}

245

249

goto decrypt_end;

246

250

}

247

251

249

253

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

250

254

}

251

255

256

if (debug){

257

gpgme_decrypt_result_t result;

258

result = gpgme_op_decrypt_result(ctx);

259

if (result == NULL){

260

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

261

} else {

262

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

263

result->unsupported_algorithm);

264

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

265

result->wrong_key_usage);

266

if(result->file_name != NULL){

267

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

268

}

269

gpgme_recipient_t recipient;

270

recipient = result->recipients;

271

if(recipient){

272

while(recipient != NULL){

273

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

274

gpgme_pubkey_algo_name(recipient->pubkey_algo));

275

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

276

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

277

recipient->status == GPG_ERR_NO_SECKEY

278

? "No" : "Yes");

279

recipient = recipient->next;

280

}

281

}

282

}

283

}

284

252

285

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

253

286

if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){

254

287

perror("pgpme_data_seek");

301

334

}

302

335

303

336

static const char * safer_gnutls_strerror (int value) {

304

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

337

const char *ret = gnutls_strerror (value);

305

338

if (ret == NULL)

306

339

ret = "(unknown)";

307

340

return ret;

314

347

}

315

348

316

349

static int init_gnutls_global(mandos_context *mc,

317

const char *pubkeyfilename,

318

const char *seckeyfilename){

350

const char *pubkeyfile,

351

const char *seckeyfile){

319

352

int ret;

320

353

321

354

if(debug){

322

355

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

323

356

}

324

325

ret = gnutls_global_init();

326

if (ret != GNUTLS_E_SUCCESS) {

357

358

if ((ret = gnutls_global_init ())

359

!= GNUTLS_E_SUCCESS) {

327

360

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

328

361

safer_gnutls_strerror(ret));

329

362

return -1;

338

371

}

339

372

340

373

/* OpenPGP credentials */

341

gnutls_certificate_allocate_credentials(&mc->cred);

342

if (ret != GNUTLS_E_SUCCESS){

343

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

344

warning */

374

if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))

375

!= GNUTLS_E_SUCCESS) {

376

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

345

377

safer_gnutls_strerror(ret));

346

378

gnutls_global_deinit ();

347

379

return -1;

349

381

350

382

if(debug){

351

383

fprintf(stderr, "Attempting to use OpenPGP certificate %s"

352

" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,

353

seckeyfilename);

384

" and keyfile %s as GnuTLS credentials\n", pubkeyfile,

385

seckeyfile);

354

386

}

355

387

356

388

ret = gnutls_certificate_set_openpgp_key_file

357

(mc->cred, pubkeyfilename, seckeyfilename,

358

GNUTLS_OPENPGP_FMT_BASE64);

389

(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);

359

390

if (ret != GNUTLS_E_SUCCESS) {

360

391

fprintf(stderr,

361

392

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

362

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

393

" '%s')\n", ret, pubkeyfile, seckeyfile);

363

394

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

364

395

safer_gnutls_strerror(ret));

365

396

goto globalfail;

457

488

}

458

489

459

490

if(debug){

460

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

461

"\n", ip, port);

491

fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",

492

ip, port);

462

493

}

463

494

464

495

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

475

506

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

476

507

}

477

508

478

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

509

memset(&to,0,sizeof(to)); /* Spurious warning */

479

510

to.in6.sin6_family = AF_INET6;

480

511

/* It would be nice to have a way to detect if we were passed an

481

512

IPv4 address here. Now we assume an IPv6 address. */

488

519

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

489

520

return -1;

490

521

}

491

to.in6.sin6_port = htons(port); /* Spurious warning */

522

to.in6.sin6_port = htons(port); /* Spurious warning */

492

523

493

524

to.in6.sin6_scope_id = (uint32_t)if_index;

494

525

495

526

if(debug){

496

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

497

port);

527

fprintf(stderr, "Connection to: %s, port %d\n", ip, port);

498

528

char addrstr[INET6_ADDRSTRLEN] = "";

499

529

if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,

500

530

sizeof(addrstr)) == NULL){

541

571

}

542

572

543

573

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

544

545

do{

546

ret = gnutls_handshake (session);

547

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

574

575

ret = gnutls_handshake (session);

548

576

549

577

if (ret != GNUTLS_E_SUCCESS){

550

578

if(debug){

582

610

case GNUTLS_E_AGAIN:

583

611

break;

584

612

case GNUTLS_E_REHANDSHAKE:

585

do{

586

ret = gnutls_handshake (session);

587

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

613

ret = gnutls_handshake (session);

588

614

if (ret < 0){

589

615

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

590

616

gnutls_perror (ret);

635

661

} else {

636

662

retval = -1;

637

663

}

638

} else {

639

retval = -1;

640

664

}

641

665

642

666

/* Shutdown procedure */

663

687

flags,

664

688

void* userdata) {

665

689

mandos_context *mc = userdata;

666

assert(r);

690

assert(r); /* Spurious warning */

667

691

668

692

/* Called whenever a service has been resolved successfully or

669

693

timed out */

681

705

char ip[AVAHI_ADDRESS_STR_MAX];

682

706

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

683

707

if(debug){

684

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

685

PRIu16 ") on port %d\n", name, host_name, ip,

686

interface, port);

708

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

709

" port %d\n", name, host_name, ip, interface, port);

687

710

}

688

711

int ret = start_mandos_communication(ip, port, interface, mc);

689

712

if (ret == 0){

690

avahi_simple_poll_quit(mc->simple_poll);

713

exit(EXIT_SUCCESS);

691

714

}

692

715

}

693

716

}

705

728

flags,

706

729

void* userdata) {

707

730

mandos_context *mc = userdata;

708

assert(b);

731

assert(b); /* Spurious warning */

709

732

710

733

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

711

734

is removed from the LAN */

747

770

748

771

/* Combines file name and path and returns the malloced new

749

772

string. some sane checks could/should be added */

750

static char *combinepath(const char *first, const char *second){

751

char *tmp;

752

int ret = asprintf(&tmp, "%s/%s", first, second);

753

if(ret < 0){

773

static const char *combinepath(const char *first, const char *second){

774

size_t f_len = strlen(first);

775

size_t s_len = strlen(second);

776

char *tmp = malloc(f_len + s_len + 2);

777

if (tmp == NULL){

754

778

return NULL;

755

779

}

780

if(f_len > 0){

781

memcpy(tmp, first, f_len); /* Spurious warning */

782

}

783

tmp[f_len] = '/';

784

if(s_len > 0){

785

memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */

786

}

787

tmp[f_len + 1 + s_len] = '\0';

756

788

return tmp;

757

789

}

758

790

769

801

gid_t gid;

770

802

char *connect_to = NULL;

771

803

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

772

char *pubkeyfilename = NULL;

773

char *seckeyfilename = NULL;

774

const char *pubkeyname = "pubkey.txt";

775

const char *seckeyname = "seckey.txt";

804

const char *pubkeyfile = "pubkey.txt";

805

const char *seckeyfile = "seckey.txt";

776

806

mandos_context mc = { .simple_poll = NULL, .server = NULL,

777

807

.dh_bits = 1024, .priority = "SECURE256"};

778

808

bool gnutls_initalized = false;

830

860

keydir = arg;

831

861

break;

832

862

case 's':

833

seckeyname = arg;

863

seckeyfile = arg;

834

864

break;

835

865

case 'p':

836

pubkeyname = arg;

866

pubkeyfile = arg;

837

867

break;

838

868

case 129:

839

869

errno = 0;

848

878

break;

849

879

case ARGP_KEY_ARG:

850

880

argp_usage (state);

851

case ARGP_KEY_END:

852

881

break;

882

case ARGP_KEY_END:

883

break;

853

884

default:

854

885

return ARGP_ERR_UNKNOWN;

855

886

}

860

891

.args_doc = "",

861

892

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

862

893

" passwords from mandos server" };

863

ret = argp_parse (&argp, argc, argv, 0, 0, NULL);

864

if (ret == ARGP_ERR_UNKNOWN){

865

fprintf(stderr, "Unknown error while parsing arguments\n");

866

exitcode = EXIT_FAILURE;

867

goto end;

868

}

894

argp_parse (&argp, argc, argv, 0, 0, NULL);

869

895

}

870

896

871

pubkeyfilename = combinepath(keydir, pubkeyname);

872

if (pubkeyfilename == NULL){

897

pubkeyfile = combinepath(keydir, pubkeyfile);

898

if (pubkeyfile == NULL){

873

899

perror("combinepath");

874

900

exitcode = EXIT_FAILURE;

875

901

goto end;

876

902

}

877

903

878

seckeyfilename = combinepath(keydir, seckeyname);

879

if (seckeyfilename == NULL){

904

seckeyfile = combinepath(keydir, seckeyfile);

905

if (seckeyfile == NULL){

880

906

perror("combinepath");

881

exitcode = EXIT_FAILURE;

882

907

goto end;

883

908

}

884

909

885

ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);

910

ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);

886

911

if (ret == -1){

887

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

888

exitcode = EXIT_FAILURE;

912

fprintf(stderr, "init_gnutls_global\n");

889

913

goto end;

890

914

} else {

891

915

gnutls_initalized = true;

892

916

}

893

894

/* If the interface is down, bring it up */

895

{

896

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

897

if(sd < 0) {

898

perror("socket");

899

exitcode = EXIT_FAILURE;

900

goto end;

901

}

902

strcpy(network.ifr_name, interface);

903

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

904

if(ret == -1){

905

perror("ioctl SIOCGIFFLAGS");

906

exitcode = EXIT_FAILURE;

907

goto end;

908

}

909

if((network.ifr_flags & IFF_UP) == 0){

910

network.ifr_flags |= IFF_UP;

911

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

912

if(ret == -1){

913

perror("ioctl SIOCSIFFLAGS");

914

exitcode = EXIT_FAILURE;

915

goto end;

916

}

917

}

918

close(sd);

919

}

920

917

921

918

uid = getuid();

922

919

gid = getgid();

923

920

924

921

ret = setuid(uid);

925

922

if (ret == -1){

926

923

perror("setuid");

964

961

goto end;

965

962

}

966

963

964

/* If the interface is down, bring it up */

965

{

966

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

967

if(sd < 0) {

968

perror("socket");

969

exitcode = EXIT_FAILURE;

970

goto end;

971

}

972

strcpy(network.ifr_name, interface); /* Spurious warning */

973

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

974

if(ret == -1){

975

perror("ioctl SIOCGIFFLAGS");

976

exitcode = EXIT_FAILURE;

977

goto end;

978

}

979

if((network.ifr_flags & IFF_UP) == 0){

980

network.ifr_flags |= IFF_UP;

981

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

982

if(ret == -1){

983

perror("ioctl SIOCSIFFLAGS");

984

exitcode = EXIT_FAILURE;

985

goto end;

986

}

987

}

988

close(sd);

989

}

990

967

991

if (not debug){

968

992

avahi_set_log_function(empty_log);

969

993

}

1041

1065

1042

1066

if (mc.simple_poll != NULL)

1043

1067

avahi_simple_poll_free(mc.simple_poll);

1044

free(pubkeyfilename);

1045

free(seckeyfilename);

1068

free(pubkeyfile);

1069

free(seckeyfile);

1046

1070

1047

1071

if (gnutls_initalized){

1048

gnutls_certificate_free_credentials(mc.cred);

1072

gnutls_certificate_free_credentials (mc.cred);

1049

1073

gnutls_global_deinit ();

1050

1074

}

1051

1075