/mandos/trunk : 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 */

229

261

} else {

230

262

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

231

263

result->unsupported_algorithm);

232

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

264

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

233

265

result->wrong_key_usage);

234

266

if(result->file_name != NULL){

235

267

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

302

334

}

303

335

304

336

static const char * safer_gnutls_strerror (int value) {

305

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

337

const char *ret = gnutls_strerror (value);

306

338

if (ret == NULL)

307

339

ret = "(unknown)";

308

340

return ret;

315

347

}

316

348

317

349

static int init_gnutls_global(mandos_context *mc,

318

const char *pubkeyfilename,

319

const char *seckeyfilename){

350

const char *pubkeyfile,

351

const char *seckeyfile){

320

352

int ret;

321

353

322

354

if(debug){

323

355

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

324

356

}

325

326

ret = gnutls_global_init();

327

if (ret != GNUTLS_E_SUCCESS) {

357

358

if ((ret = gnutls_global_init ())

359

!= GNUTLS_E_SUCCESS) {

328

360

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

329

361

safer_gnutls_strerror(ret));

330

362

return -1;

339

371

}

340

372

341

373

/* OpenPGP credentials */

342

gnutls_certificate_allocate_credentials(&mc->cred);

343

if (ret != GNUTLS_E_SUCCESS){

344

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

345

warning */

374

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

375

!= GNUTLS_E_SUCCESS) {

376

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

346

377

safer_gnutls_strerror(ret));

347

378

gnutls_global_deinit ();

348

379

return -1;

350

381

351

382

if(debug){

352

383

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

353

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

354

seckeyfilename);

384

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

385

seckeyfile);

355

386

}

356

387

357

388

ret = gnutls_certificate_set_openpgp_key_file

358

(mc->cred, pubkeyfilename, seckeyfilename,

359

GNUTLS_OPENPGP_FMT_BASE64);

389

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

360

390

if (ret != GNUTLS_E_SUCCESS) {

361

391

fprintf(stderr,

362

392

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

363

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

393

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

364

394

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

365

395

safer_gnutls_strerror(ret));

366

396

goto globalfail;

458

488

}

459

489

460

490

if(debug){

461

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

462

"\n", ip, port);

491

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

492

ip, port);

463

493

}

464

494

465

495

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

476

506

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

477

507

}

478

508

479

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

509

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

480

510

to.in6.sin6_family = AF_INET6;

481

511

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

482

512

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

489

519

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

490

520

return -1;

491

521

}

492

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

522

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

493

523

494

524

to.in6.sin6_scope_id = (uint32_t)if_index;

495

525

496

526

if(debug){

497

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

498

port);

527

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

499

528

char addrstr[INET6_ADDRSTRLEN] = "";

500

529

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

501

530

sizeof(addrstr)) == NULL){

542

571

}

543

572

544

573

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

545

546

do{

547

ret = gnutls_handshake (session);

548

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

574

575

ret = gnutls_handshake (session);

549

576

550

577

if (ret != GNUTLS_E_SUCCESS){

551

578

if(debug){

583

610

case GNUTLS_E_AGAIN:

584

611

break;

585

612

case GNUTLS_E_REHANDSHAKE:

586

do{

587

ret = gnutls_handshake (session);

588

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

613

ret = gnutls_handshake (session);

589

614

if (ret < 0){

590

615

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

591

616

gnutls_perror (ret);

662

687

flags,

663

688

void* userdata) {

664

689

mandos_context *mc = userdata;

665

assert(r);

690

assert(r); /* Spurious warning */

666

691

667

692

/* Called whenever a service has been resolved successfully or

668

693

timed out */

680

705

char ip[AVAHI_ADDRESS_STR_MAX];

681

706

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

682

707

if(debug){

683

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

684

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

685

interface, port);

708

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

709

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

686

710

}

687

711

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

688

712

if (ret == 0){

689

avahi_simple_poll_quit(mc->simple_poll);

713

exit(EXIT_SUCCESS);

690

714

}

691

715

}

692

716

}

704

728

flags,

705

729

void* userdata) {

706

730

mandos_context *mc = userdata;

707

assert(b);

731

assert(b); /* Spurious warning */

708

732

709

733

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

710

734

is removed from the LAN */

746

770

747

771

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

748

772

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

749

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

750

char *tmp;

751

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

752

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){

753

778

return NULL;

754

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';

755

788

return tmp;

756

789

}

757

790

768

801

gid_t gid;

769

802

char *connect_to = NULL;

770

803

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

771

char *pubkeyfilename = NULL;

772

char *seckeyfilename = NULL;

773

const char *pubkeyname = "pubkey.txt";

774

const char *seckeyname = "seckey.txt";

804

const char *pubkeyfile = "pubkey.txt";

805

const char *seckeyfile = "seckey.txt";

775

806

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

776

807

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

777

808

bool gnutls_initalized = false;

829

860

keydir = arg;

830

861

break;

831

862

case 's':

832

seckeyname = arg;

863

seckeyfile = arg;

833

864

break;

834

865

case 'p':

835

pubkeyname = arg;

866

pubkeyfile = arg;

836

867

break;

837

868

case 129:

838

869

errno = 0;

847

878

break;

848

879

case ARGP_KEY_ARG:

849

880

argp_usage (state);

850

case ARGP_KEY_END:

851

881

break;

882

case ARGP_KEY_END:

883

break;

852

884

default:

853

885

return ARGP_ERR_UNKNOWN;

854

886

}

859

891

.args_doc = "",

860

892

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

861

893

" passwords from mandos server" };

862

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

863

if (ret == ARGP_ERR_UNKNOWN){

864

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

865

exitcode = EXIT_FAILURE;

866

goto end;

867

}

894

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

868

895

}

869

896

870

pubkeyfilename = combinepath(keydir, pubkeyname);

871

if (pubkeyfilename == NULL){

897

pubkeyfile = combinepath(keydir, pubkeyfile);

898

if (pubkeyfile == NULL){

872

899

perror("combinepath");

873

900

exitcode = EXIT_FAILURE;

874

901

goto end;

875

902

}

876

903

877

seckeyfilename = combinepath(keydir, seckeyname);

878

if (seckeyfilename == NULL){

904

seckeyfile = combinepath(keydir, seckeyfile);

905

if (seckeyfile == NULL){

879

906

perror("combinepath");

880

exitcode = EXIT_FAILURE;

881

907

goto end;

882

908

}

883

909

884

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

910

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

885

911

if (ret == -1){

886

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

887

exitcode = EXIT_FAILURE;

912

fprintf(stderr, "init_gnutls_global\n");

888

913

goto end;

889

914

} else {

890

915

gnutls_initalized = true;

891

916

}

892

893

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

894

{

895

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

896

if(sd < 0) {

897

perror("socket");

898

exitcode = EXIT_FAILURE;

899

goto end;

900

}

901

strcpy(network.ifr_name, interface);

902

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

903

if(ret == -1){

904

perror("ioctl SIOCGIFFLAGS");

905

exitcode = EXIT_FAILURE;

906

goto end;

907

}

908

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

909

network.ifr_flags |= IFF_UP;

910

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

911

if(ret == -1){

912

perror("ioctl SIOCSIFFLAGS");

913

exitcode = EXIT_FAILURE;

914

goto end;

915

}

916

}

917

close(sd);

918

}

919

917

920

918

uid = getuid();

921

919

gid = getgid();

922

920

923

921

ret = setuid(uid);

924

922

if (ret == -1){

925

923

perror("setuid");

963

961

goto end;

964

962

}

965

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

966

991

if (not debug){

967

992

avahi_set_log_function(empty_log);

968

993

}

1040

1065

1041

1066

if (mc.simple_poll != NULL)

1042

1067

avahi_simple_poll_free(mc.simple_poll);

1043

free(pubkeyfilename);

1044

free(seckeyfilename);

1068

free(pubkeyfile);

1069

free(seckeyfile);

1045

1070

1046

1071

if (gnutls_initalized){

1047

gnutls_certificate_free_credentials(mc.cred);

1072

gnutls_certificate_free_credentials (mc.cred);

1048

1073

gnutls_global_deinit ();

1049

1074

}

1050

1075