/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,

53

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,

59

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 */

214

190

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

215

191

gpgme_strsource(rc), gpgme_strerror(rc));

216

192

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

193

goto decrypt_end;

246

194

}

247

195

249

197

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

250

198

}

251

199

200

if (debug){

201

gpgme_decrypt_result_t result;

202

result = gpgme_op_decrypt_result(ctx);

203

if (result == NULL){

204

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

205

} else {

206

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

207

result->unsupported_algorithm);

208

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

209

result->wrong_key_usage);

210

if(result->file_name != NULL){

211

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

212

}

213

gpgme_recipient_t recipient;

214

recipient = result->recipients;

215

if(recipient){

216

while(recipient != NULL){

217

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

218

gpgme_pubkey_algo_name(recipient->pubkey_algo));

219

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

220

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

221

recipient->status == GPG_ERR_NO_SECKEY

222

? "No" : "Yes");

223

recipient = recipient->next;

224

}

225

}

226

}

227

}

228

252

229

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

253

230

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

254

231

perror("pgpme_data_seek");

301

278

}

302

279

303

280

static const char * safer_gnutls_strerror (int value) {

304

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

281

const char *ret = gnutls_strerror (value);

305

282

if (ret == NULL)

306

283

ret = "(unknown)";

307

284

return ret;

314

291

}

315

292

316

293

static int init_gnutls_global(mandos_context *mc,

317

const char *pubkeyfilename,

318

const char *seckeyfilename){

294

const char *pubkeyfile,

295

const char *seckeyfile){

319

296

int ret;

320

297

321

298

if(debug){

322

299

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

323

300

}

324

325

ret = gnutls_global_init();

326

if (ret != GNUTLS_E_SUCCESS) {

301

302

if ((ret = gnutls_global_init ())

303

!= GNUTLS_E_SUCCESS) {

327

304

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

328

305

safer_gnutls_strerror(ret));

329

306

return -1;

338

315

}

339

316

340

317

/* 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 */

318

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

319

!= GNUTLS_E_SUCCESS) {

320

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

345

321

safer_gnutls_strerror(ret));

346

322

gnutls_global_deinit ();

347

323

return -1;

349

325

350

326

if(debug){

351

327

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

352

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

353

seckeyfilename);

328

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

329

seckeyfile);

354

330

}

355

331

356

332

ret = gnutls_certificate_set_openpgp_key_file

357

(mc->cred, pubkeyfilename, seckeyfilename,

358

GNUTLS_OPENPGP_FMT_BASE64);

333

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

359

334

if (ret != GNUTLS_E_SUCCESS) {

360

335

fprintf(stderr,

361

336

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

362

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

337

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

363

338

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

364

339

safer_gnutls_strerror(ret));

365

340

goto globalfail;

385

360

386

361

globalfail:

387

362

388

gnutls_certificate_free_credentials(mc->cred);

389

gnutls_global_deinit();

363

gnutls_certificate_free_credentials (mc->cred);

364

gnutls_global_deinit ();

390

365

return -1;

391

366

392

367

}

457

432

}

458

433

459

434

if(debug){

460

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

461

"\n", ip, port);

435

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

436

ip, port);

462

437

}

463

438

464

439

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

475

450

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

476

451

}

477

452

478

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

453

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

479

454

to.in6.sin6_family = AF_INET6;

480

455

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

481

456

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

488

463

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

489

464

return -1;

490

465

}

491

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

466

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

492

467

493

468

to.in6.sin6_scope_id = (uint32_t)if_index;

494

469

495

470

if(debug){

496

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

497

port);

471

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

498

472

char addrstr[INET6_ADDRSTRLEN] = "";

499

473

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

500

474

sizeof(addrstr)) == NULL){

541

515

}

542

516

543

517

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);

518

519

ret = gnutls_handshake (session);

548

520

549

521

if (ret != GNUTLS_E_SUCCESS){

550

522

if(debug){

582

554

case GNUTLS_E_AGAIN:

583

555

break;

584

556

case GNUTLS_E_REHANDSHAKE:

585

do{

586

ret = gnutls_handshake (session);

587

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

557

ret = gnutls_handshake (session);

588

558

if (ret < 0){

589

559

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

590

560

gnutls_perror (ret);

635

605

} else {

636

606

retval = -1;

637

607

}

638

} else {

639

retval = -1;

640

608

}

641

609

642

610

/* Shutdown procedure */

663

631

flags,

664

632

void* userdata) {

665

633

mandos_context *mc = userdata;

666

assert(r);

634

assert(r); /* Spurious warning */

667

635

668

636

/* Called whenever a service has been resolved successfully or

669

637

timed out */

681

649

char ip[AVAHI_ADDRESS_STR_MAX];

682

650

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

683

651

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);

652

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

653

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

687

654

}

688

655

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

689

656

if (ret == 0){

690

avahi_simple_poll_quit(mc->simple_poll);

657

exit(EXIT_SUCCESS);

691

658

}

692

659

}

693

660

}

705

672

flags,

706

673

void* userdata) {

707

674

mandos_context *mc = userdata;

708

assert(b);

675

assert(b); /* Spurious warning */

709

676

710

677

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

711

678

is removed from the LAN */

747

714

748

715

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

749

716

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){

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){

754

722

return NULL;

755

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';

756

732

return tmp;

757

733

}

758

734

769

745

gid_t gid;

770

746

char *connect_to = NULL;

771

747

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";

748

const char *pubkeyfile = "pubkey.txt";

749

const char *seckeyfile = "seckey.txt";

776

750

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

777

751

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

778

752

bool gnutls_initalized = false;

830

804

keydir = arg;

831

805

break;

832

806

case 's':

833

seckeyname = arg;

807

seckeyfile = arg;

834

808

break;

835

809

case 'p':

836

pubkeyname = arg;

810

pubkeyfile = arg;

837

811

break;

838

812

case 129:

839

813

errno = 0;

848

822

break;

849

823

case ARGP_KEY_ARG:

850

824

argp_usage (state);

851

case ARGP_KEY_END:

852

825

break;

826

case ARGP_KEY_END:

827

break;

853

828

default:

854

829

return ARGP_ERR_UNKNOWN;

855

830

}

860

835

.args_doc = "",

861

836

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

862

837

" 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

}

838

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

869

839

}

870

840

871

pubkeyfilename = combinepath(keydir, pubkeyname);

872

if (pubkeyfilename == NULL){

841

pubkeyfile = combinepath(keydir, pubkeyfile);

842

if (pubkeyfile == NULL){

873

843

perror("combinepath");

874

844

exitcode = EXIT_FAILURE;

875

845

goto end;

876

846

}

877

847

878

seckeyfilename = combinepath(keydir, seckeyname);

879

if (seckeyfilename == NULL){

848

seckeyfile = combinepath(keydir, seckeyfile);

849

if (seckeyfile == NULL){

880

850

perror("combinepath");

881

exitcode = EXIT_FAILURE;

882

851

goto end;

883

852

}

884

853

885

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

854

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

886

855

if (ret == -1){

887

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

888

exitcode = EXIT_FAILURE;

856

fprintf(stderr, "init_gnutls_global\n");

889

857

goto end;

890

858

} else {

891

859

gnutls_initalized = true;

892

860

}

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

861

921

862

uid = getuid();

922

863

gid = getgid();

923

864

924

865

ret = setuid(uid);

925

866

if (ret == -1){

926

867

perror("setuid");

964

905

goto end;

965

906

}

966

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

967

935

if (not debug){

968

936

avahi_set_log_function(empty_log);

969

937

}

1041

1009

1042

1010

if (mc.simple_poll != NULL)

1043

1011

avahi_simple_poll_free(mc.simple_poll);

1044

free(pubkeyfilename);

1045

free(seckeyfilename);

1012

free(pubkeyfile);

1013

free(seckeyfile);

1046

1014

1047

1015

if (gnutls_initalized){

1048

gnutls_certificate_free_credentials(mc.cred);

1016

gnutls_certificate_free_credentials (mc.cred);

1049

1017

gnutls_global_deinit ();

1050

1018

}

1051

1019