/mandos/trunk : revision 48

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() */

39

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

40

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

41

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

42

srand() */

43

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

44

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

45

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

46

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

47

#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 */

52

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

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struct in6_addr, inet_pton(),

54

connect() */

55

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

56

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

57

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

37

#include <stdio.h>

38

#include <assert.h>

39

#include <stdlib.h>

40

#include <time.h>

41

#include <net/if.h> /* if_nametoindex */

42

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

43

SIOCSIFFLAGS */

58

44

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

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SIOCSIFFLAGS, if_indextoname(),

60

if_nametoindex(), IF_NAMESIZE */

61

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

62

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

63

setgid() */

64

#include <netinet/in.h>

65

#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 */

45

SIOCSIFFLAGS */

71

46

72

/* Avahi */

73

/* All Avahi types, constants and functions

74

Avahi*, avahi_*,

75

AVAHI_* */

76

47

#include <avahi-core/core.h>

77

48

#include <avahi-core/lookup.h>

78

49

#include <avahi-core/log.h>

80

51

#include <avahi-common/malloc.h>

81

52

#include <avahi-common/error.h>

82

53

83

/* GnuTLS */

84

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

85

functions:

86

gnutls_*

87

init_gnutls_session(),

88

GNUTLS_* */

89

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

90

GNUTLS_OPENPGP_FMT_BASE64 */

54

/* Mandos client part */

55

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

56

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

57

struct in6_addr, inet_pton() */

58

#include <gnutls/gnutls.h> /* All GnuTLS stuff */

59

#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */

91

60

61

#include <unistd.h> /* close() */

62

#include <netinet/in.h>

63

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

64

#include <string.h> /* memset */

65

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

66

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

67

#include <net/if.h> /* IF_NAMESIZE */

68

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

69

struct argp_state, struct argp,

70

argp_parse() */

92

71

/* GPGME */

93

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

94

functions:

95

gpgme_*

96

GPGME_PROTOCOL_OpenPGP,

97

GPG_ERR_NO_* */

72

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

73

#include <gpgme.h>

98

74

99

75

#define BUFFER_SIZE 256

100

76

101

77

bool debug = false;

102

78

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

103

79

static const char mandos_protocol_version[] = "1";

104

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

80

const char *argp_program_version = "mandosclient 0.9";

105

81

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

106

82

107

83

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

229

205

} else {

230

206

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

231

207

result->unsupported_algorithm);

232

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

208

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

233

209

result->wrong_key_usage);

234

210

if(result->file_name != NULL){

235

211

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

302

278

}

303

279

304

280

static const char * safer_gnutls_strerror (int value) {

305

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

281

const char *ret = gnutls_strerror (value);

306

282

if (ret == NULL)

307

283

ret = "(unknown)";

308

284

return ret;

315

291

}

316

292

317

293

static int init_gnutls_global(mandos_context *mc,

318

const char *pubkeyfilename,

319

const char *seckeyfilename){

294

const char *pubkeyfile,

295

const char *seckeyfile){

320

296

int ret;

321

297

322

298

if(debug){

323

299

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

324

300

}

325

326

ret = gnutls_global_init();

327

if (ret != GNUTLS_E_SUCCESS) {

301

302

if ((ret = gnutls_global_init ())

303

!= GNUTLS_E_SUCCESS) {

328

304

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

329

305

safer_gnutls_strerror(ret));

330

306

return -1;

339

315

}

340

316

341

317

/* 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 */

318

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

319

!= GNUTLS_E_SUCCESS) {

320

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

346

321

safer_gnutls_strerror(ret));

347

322

gnutls_global_deinit ();

348

323

return -1;

350

325

351

326

if(debug){

352

327

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

353

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

354

seckeyfilename);

328

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

329

seckeyfile);

355

330

}

356

331

357

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ret = gnutls_certificate_set_openpgp_key_file

358

(mc->cred, pubkeyfilename, seckeyfilename,

359

GNUTLS_OPENPGP_FMT_BASE64);

333

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

360

334

if (ret != GNUTLS_E_SUCCESS) {

361

335

fprintf(stderr,

362

336

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

363

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

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

364

338

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

365

339

safer_gnutls_strerror(ret));

366

340

goto globalfail;

386

360

387

361

globalfail:

388

362

389

gnutls_certificate_free_credentials(mc->cred);

390

gnutls_global_deinit();

363

gnutls_certificate_free_credentials (mc->cred);

364

gnutls_global_deinit ();

391

365

return -1;

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366

393

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}

458

432

}

459

433

460

434

if(debug){

461

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

462

"\n", ip, port);

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

436

ip, port);

463

437

}

464

438

465

439

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

476

450

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

477

451

}

478

452

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

453

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

480

454

to.in6.sin6_family = AF_INET6;

481

455

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

482

456

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

489

463

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

490

464

return -1;

491

465

}

492

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

466

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

493

467

494

468

to.in6.sin6_scope_id = (uint32_t)if_index;

495

469

496

470

if(debug){

497

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

498

port);

471

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

499

472

char addrstr[INET6_ADDRSTRLEN] = "";

500

473

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

501

474

sizeof(addrstr)) == NULL){

542

515

}

543

516

544

517

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);

518

519

ret = gnutls_handshake (session);

549

520

550

521

if (ret != GNUTLS_E_SUCCESS){

551

522

if(debug){

583

554

case GNUTLS_E_AGAIN:

584

555

break;

585

556

case GNUTLS_E_REHANDSHAKE:

586

do{

587

ret = gnutls_handshake (session);

588

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

557

ret = gnutls_handshake (session);

589

558

if (ret < 0){

590

559

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

591

560

gnutls_perror (ret);

662

631

flags,

663

632

void* userdata) {

664

633

mandos_context *mc = userdata;

665

assert(r);

634

assert(r); /* Spurious warning */

666

635

667

636

/* Called whenever a service has been resolved successfully or

668

637

timed out */

680

649

char ip[AVAHI_ADDRESS_STR_MAX];

681

650

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

682

651

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);

652

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

653

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

686

654

}

687

655

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

688

656

if (ret == 0){

689

avahi_simple_poll_quit(mc->simple_poll);

657

exit(EXIT_SUCCESS);

690

658

}

691

659

}

692

660

}

704

672

flags,

705

673

void* userdata) {

706

674

mandos_context *mc = userdata;

707

assert(b);

675

assert(b); /* Spurious warning */

708

676

709

677

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

710

678

is removed from the LAN */

746

714

747

715

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

748

716

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){

717

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

718

size_t f_len = strlen(first);

719

size_t s_len = strlen(second);

720

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

721

if (tmp == NULL){

753

722

return NULL;

754

723

}

724

if(f_len > 0){

725

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

726

}

727

tmp[f_len] = '/';

728

if(s_len > 0){

729

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

730

}

731

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

755

732

return tmp;

756

733

}

757

734

768

745

gid_t gid;

769

746

char *connect_to = NULL;

770

747

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";

748

const char *pubkeyfile = "pubkey.txt";

749

const char *seckeyfile = "seckey.txt";

775

750

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

776

751

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

777

752

bool gnutls_initalized = false;

829

804

keydir = arg;

830

805

break;

831

806

case 's':

832

seckeyname = arg;

807

seckeyfile = arg;

833

808

break;

834

809

case 'p':

835

pubkeyname = arg;

810

pubkeyfile = arg;

836

811

break;

837

812

case 129:

838

813

errno = 0;

847

822

break;

848

823

case ARGP_KEY_ARG:

849

824

argp_usage (state);

850

case ARGP_KEY_END:

851

825

break;

826

case ARGP_KEY_END:

827

break;

852

828

default:

853

829

return ARGP_ERR_UNKNOWN;

854

830

}

859

835

.args_doc = "",

860

836

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

861

837

" 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

}

838

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

868

839

}

869

840

870

pubkeyfilename = combinepath(keydir, pubkeyname);

871

if (pubkeyfilename == NULL){

841

pubkeyfile = combinepath(keydir, pubkeyfile);

842

if (pubkeyfile == NULL){

872

843

perror("combinepath");

873

844

exitcode = EXIT_FAILURE;

874

845

goto end;

875

846

}

876

847

877

seckeyfilename = combinepath(keydir, seckeyname);

878

if (seckeyfilename == NULL){

848

seckeyfile = combinepath(keydir, seckeyfile);

849

if (seckeyfile == NULL){

879

850

perror("combinepath");

880

exitcode = EXIT_FAILURE;

881

851

goto end;

882

852

}

883

853

884

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

854

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

885

855

if (ret == -1){

886

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

887

exitcode = EXIT_FAILURE;

856

fprintf(stderr, "init_gnutls_global\n");

888

857

goto end;

889

858

} else {

890

859

gnutls_initalized = true;

891

860

}

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

861

920

862

uid = getuid();

921

863

gid = getgid();

922

864

923

865

ret = setuid(uid);

924

866

if (ret == -1){

925

867

perror("setuid");

963

905

goto end;

964

906

}

965

907

908

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

909

{

910

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

911

if(sd < 0) {

912

perror("socket");

913

exitcode = EXIT_FAILURE;

914

goto end;

915

}

916

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

917

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

918

if(ret == -1){

919

perror("ioctl SIOCGIFFLAGS");

920

exitcode = EXIT_FAILURE;

921

goto end;

922

}

923

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

924

network.ifr_flags |= IFF_UP;

925

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

926

if(ret == -1){

927

perror("ioctl SIOCSIFFLAGS");

928

exitcode = EXIT_FAILURE;

929

goto end;

930

}

931

}

932

close(sd);

933

}

934

966

935

if (not debug){

967

936

avahi_set_log_function(empty_log);

968

937

}

1040

1009

1041

1010

if (mc.simple_poll != NULL)

1042

1011

avahi_simple_poll_free(mc.simple_poll);

1043

free(pubkeyfilename);

1044

free(seckeyfilename);

1012

free(pubkeyfile);

1013

free(seckeyfile);

1045

1014

1046

1015

if (gnutls_initalized){

1047

gnutls_certificate_free_credentials(mc.cred);

1016

gnutls_certificate_free_credentials (mc.cred);

1048

1017

gnutls_global_deinit ();

1049

1018

}

1050

1019