File: x509.c

package info (click to toggle)
lua-sec 0.7-1~bpo9+1
  • links: PTS, VCS
  • area: main
  • in suites: stretch-backports
  • size: 808 kB
  • sloc: ansic: 3,332; makefile: 106; sh: 46
file content (725 lines) | stat: -rw-r--r-- 16,821 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
/*--------------------------------------------------------------------------
 * LuaSec 0.7
 *
 * Copyright (C) 2014-2018 Kim Alvefur, Paul Aurich, Tobias Markmann
 *                         Matthew Wild, Bruno Silvestre.
 *
 *--------------------------------------------------------------------------*/

#include <stdio.h>
#include <string.h>

#if defined(WIN32)
#include <ws2tcpip.h>
#include <windows.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#endif

#include <openssl/ssl.h>
#include <openssl/x509v3.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/asn1.h>
#include <openssl/bio.h>
#include <openssl/bn.h>

#include <lua.h>
#include <lauxlib.h>

#include "x509.h"


/*
 * ASN1_STRING_data is deprecated in OpenSSL 1.1.0
 */
#if OPENSSL_VERSION_NUMBER>=0x1010000fL && !defined(LIBRESSL_VERSION_NUMBER)
#define LSEC_ASN1_STRING_data(x) ASN1_STRING_get0_data(x)
#else
#define LSEC_ASN1_STRING_data(x) ASN1_STRING_data(x)
#endif


static const char* hex_tab = "0123456789abcdef";

/**
 * Push the certificate on the stack.
 */
void lsec_pushx509(lua_State* L, X509 *cert)
{
  p_x509 cert_obj = (p_x509)lua_newuserdata(L, sizeof(t_x509));
  cert_obj->cert = cert;
  cert_obj->encode = LSEC_AI5_STRING;
  luaL_getmetatable(L, "SSL:Certificate");
  lua_setmetatable(L, -2);
}

/**
 * Return the OpenSSL certificate X509.
 */
X509* lsec_checkx509(lua_State* L, int idx)
{
  return ((p_x509)luaL_checkudata(L, idx, "SSL:Certificate"))->cert;
}

/**
 * Return LuaSec certificate X509 representation.
 */
p_x509 lsec_checkp_x509(lua_State* L, int idx)
{
  return (p_x509)luaL_checkudata(L, idx, "SSL:Certificate");
}

/*---------------------------------------------------------------------------*/

#if defined(LUASEC_INET_NTOP)
/*
 * For WinXP (SP3), set the following preprocessor macros:
 *     LUASEC_INET_NTOP
 *     WINVER=0x0501
 *     _WIN32_WINNT=0x0501
 *     NTDDI_VERSION=0x05010300
 *
 * For IPv6 addresses, you need to add IPv6 Protocol to your interface.
 *
 */
static const char *inet_ntop(int af, const char *src, char *dst, socklen_t size)
{
  int addrsize;
  struct sockaddr    *addr;
  struct sockaddr_in  addr4;
  struct sockaddr_in6 addr6;

  switch (af) {
  case AF_INET:
    memset((void*)&addr4, 0, sizeof(addr4));
    addr4.sin_family = AF_INET;
    memcpy((void*)&addr4.sin_addr, src, sizeof(struct in_addr));
    addr = (struct sockaddr*)&addr4;
    addrsize = sizeof(struct sockaddr_in);
    break;
  case AF_INET6:
    memset((void*)&addr6, 0, sizeof(addr6));
    addr6.sin6_family = AF_INET6;
    memcpy((void*)&addr6.sin6_addr, src, sizeof(struct in6_addr));
    addr = (struct sockaddr*)&addr6;
    addrsize = sizeof(struct sockaddr_in6);
    break;
  default:
    return NULL;
  }

  if(getnameinfo(addr, addrsize, dst, size, NULL, 0, NI_NUMERICHOST) != 0)
    return NULL;
  return dst;
}
#endif

/*---------------------------------------------------------------------------*/

/**
 * Convert the buffer 'in' to hexadecimal.
 */
static void to_hex(const char* in, int length, char* out)
{
  int i;
  for (i = 0; i < length; i++) {
    out[i*2] = hex_tab[(in[i] >> 4) & 0xF];
    out[i*2+1] = hex_tab[(in[i]) & 0xF];
  }
}

/**
 * Converts the ASN1_OBJECT into a textual representation and put it
 * on the Lua stack.
 */
static void push_asn1_objname(lua_State* L, ASN1_OBJECT *object, int no_name)
{
  char buffer[256];
  int len = OBJ_obj2txt(buffer, sizeof(buffer), object, no_name);
  len = (len < sizeof(buffer)) ? len : sizeof(buffer);
  lua_pushlstring(L, buffer, len);
}

/**
 * Push the ASN1 string on the stack.
 */
static void push_asn1_string(lua_State* L, ASN1_STRING *string, int encode)
{
  int len;
  unsigned char *data;
  if (!string) {
    lua_pushnil(L);
    return;
  }
  switch (encode) {
  case LSEC_AI5_STRING:
    lua_pushlstring(L, (char*)LSEC_ASN1_STRING_data(string),
                       ASN1_STRING_length(string));
    break;
  case LSEC_UTF8_STRING:
    len = ASN1_STRING_to_UTF8(&data, string);
    if (len >= 0) {
      lua_pushlstring(L, (char*)data, len);
      OPENSSL_free(data);
    }
    else
      lua_pushnil(L);
  }
}

/**
 * Return a human readable time.
 */
static int push_asn1_time(lua_State *L, ASN1_UTCTIME *tm)
{
  char *tmp;
  long size;
  BIO *out = BIO_new(BIO_s_mem());
  ASN1_TIME_print(out, tm);
  size = BIO_get_mem_data(out, &tmp);
  lua_pushlstring(L, tmp, size);
  BIO_free(out);
  return 1;
}

/**
 * Return a human readable IP address.
 */
static void push_asn1_ip(lua_State *L, ASN1_STRING *string)
{
  int af;
  char dst[INET6_ADDRSTRLEN];
  unsigned char *ip = (unsigned char*)LSEC_ASN1_STRING_data(string);
  switch(ASN1_STRING_length(string)) {
  case 4:
    af = AF_INET;
    break;
  case 16:
    af = AF_INET6;
    break;
  default:
    lua_pushnil(L);
    return;
  }
  if(inet_ntop(af, ip, dst, INET6_ADDRSTRLEN))
    lua_pushstring(L, dst);
  else
    lua_pushnil(L);
}

/**
 * 
 */
static int push_subtable(lua_State* L, int idx)
{
  lua_pushvalue(L, -1);
  lua_gettable(L, idx-1);
  if (lua_isnil(L, -1)) {
    lua_pop(L, 1);
    lua_newtable(L);
    lua_pushvalue(L, -2);
    lua_pushvalue(L, -2);
    lua_settable(L, idx-3);
    lua_replace(L, -2); /* Replace key with table */
    return 1;
  }
  lua_replace(L, -2); /* Replace key with table */
  return 0;
}

/**
 * Retrieve the general names from the object.
 */
static int push_x509_name(lua_State* L, X509_NAME *name, int encode)
{
  int i;
  int n_entries;
  ASN1_OBJECT *object;
  X509_NAME_ENTRY *entry;
  lua_newtable(L);
  n_entries = X509_NAME_entry_count(name);
  for (i = 0; i < n_entries; i++) {
    entry = X509_NAME_get_entry(name, i);
    object = X509_NAME_ENTRY_get_object(entry);
    lua_newtable(L);
    push_asn1_objname(L, object, 1);
    lua_setfield(L, -2, "oid");
    push_asn1_objname(L, object, 0);
    lua_setfield(L, -2, "name");
    push_asn1_string(L, X509_NAME_ENTRY_get_data(entry), encode);
    lua_setfield(L, -2, "value");
    lua_rawseti(L, -2, i+1);
  }
  return 1;
}

/*---------------------------------------------------------------------------*/

/**
 * Retrieve the Subject from the certificate.
 */
static int meth_subject(lua_State* L)
{
  p_x509 px = lsec_checkp_x509(L, 1);
  return push_x509_name(L, X509_get_subject_name(px->cert), px->encode);
}

/**
 * Retrieve the Issuer from the certificate.
 */
static int meth_issuer(lua_State* L)
{
  p_x509 px = lsec_checkp_x509(L, 1);
  return push_x509_name(L, X509_get_issuer_name(px->cert), px->encode);
}

/**
 * Retrieve the extensions from the certificate.
 */
int meth_extensions(lua_State* L)
{
  int j;
  int i = -1;
  int n_general_names;
  OTHERNAME *otherName;
  X509_EXTENSION *extension;
  GENERAL_NAME *general_name;
  STACK_OF(GENERAL_NAME) *values;
  p_x509 px  = lsec_checkp_x509(L, 1);
  X509 *peer = px->cert;

  /* Return (ret) */
  lua_newtable(L);

  while ((i = X509_get_ext_by_NID(peer, NID_subject_alt_name, i)) != -1) {
    extension = X509_get_ext(peer, i);
    if (extension == NULL)
      break;
    values = X509V3_EXT_d2i(extension);
    if (values == NULL)
      break;

    /* Push ret[oid] */
    push_asn1_objname(L, X509_EXTENSION_get_object(extension), 1);
    push_subtable(L, -2);

    /* Set ret[oid].name = name */
    push_asn1_objname(L, X509_EXTENSION_get_object(extension), 0);
    lua_setfield(L, -2, "name");

    n_general_names = sk_GENERAL_NAME_num(values);
    for (j = 0; j < n_general_names; j++) {
      general_name = sk_GENERAL_NAME_value(values, j);
      switch (general_name->type) {
      case GEN_OTHERNAME:
        otherName = general_name->d.otherName;
        push_asn1_objname(L, otherName->type_id, 1);
        if (push_subtable(L, -2)) {
          push_asn1_objname(L, otherName->type_id, 0);
          lua_setfield(L, -2, "name");
        }
        push_asn1_string(L, otherName->value->value.asn1_string, px->encode);
        lua_rawseti(L, -2, lua_rawlen(L, -2) + 1);
        lua_pop(L, 1);
        break;
      case GEN_DNS:
        lua_pushstring(L, "dNSName");
        push_subtable(L, -2);
        push_asn1_string(L, general_name->d.dNSName, px->encode);
        lua_rawseti(L, -2, lua_rawlen(L, -2) + 1);
        lua_pop(L, 1);
        break;
      case GEN_EMAIL:
        lua_pushstring(L, "rfc822Name");
        push_subtable(L, -2);
        push_asn1_string(L, general_name->d.rfc822Name, px->encode);
        lua_rawseti(L, -2, lua_rawlen(L, -2) + 1);
        lua_pop(L, 1);
        break;
      case GEN_URI:
        lua_pushstring(L, "uniformResourceIdentifier");
        push_subtable(L, -2);
        push_asn1_string(L, general_name->d.uniformResourceIdentifier, px->encode);
        lua_rawseti(L, -2, lua_rawlen(L, -2)+1);
        lua_pop(L, 1);
        break;
      case GEN_IPADD:
        lua_pushstring(L, "iPAddress");
        push_subtable(L, -2);
        push_asn1_ip(L, general_name->d.iPAddress);
        lua_rawseti(L, -2, lua_rawlen(L, -2)+1);
        lua_pop(L, 1);
        break;
      case GEN_X400:
        /* x400Address   */
        /* not supported */
        break;
      case GEN_DIRNAME:
        /* directoryName */
        /* not supported */
        break;
      case GEN_EDIPARTY:
        /* ediPartyName */
        /* not supported */
        break;
      case GEN_RID:
        /* registeredID  */
        /* not supported */
        break;
      }
    }
    lua_pop(L, 1); /* ret[oid] */
    i++;           /* Next extension */
  }
  return 1;
}

/**
 * Convert the certificate to PEM format.
 */
static int meth_pem(lua_State* L)
{
  char* data;
  long bytes;
  X509* cert = lsec_checkx509(L, 1);
  BIO *bio = BIO_new(BIO_s_mem());
  if (!PEM_write_bio_X509(bio, cert)) {
    lua_pushnil(L);
    return 1;
  }
  bytes = BIO_get_mem_data(bio, &data);
  if (bytes > 0)
    lua_pushlstring(L, data, bytes);
  else
    lua_pushnil(L);
  BIO_free(bio);
  return 1;
}

/**
 * Extract public key in PEM format.
 */
static int meth_pubkey(lua_State* L)
{
  char* data;
  long bytes;
  int ret = 1;
  X509* cert = lsec_checkx509(L, 1);
  BIO *bio = BIO_new(BIO_s_mem());
  EVP_PKEY *pkey = X509_get_pubkey(cert);
  if(PEM_write_bio_PUBKEY(bio, pkey)) {
    bytes = BIO_get_mem_data(bio, &data);
    if (bytes > 0) {
      lua_pushlstring(L, data, bytes);
      switch(EVP_PKEY_base_id(pkey)) {
        case EVP_PKEY_RSA:
          lua_pushstring(L, "RSA");
          break;
        case EVP_PKEY_DSA:
          lua_pushstring(L, "DSA");
          break;
        case EVP_PKEY_DH:
          lua_pushstring(L, "DH");
          break;
        case EVP_PKEY_EC:
          lua_pushstring(L, "EC");
          break;
        default:
          lua_pushstring(L, "Unknown");
          break;
      }
      lua_pushinteger(L, EVP_PKEY_bits(pkey));
      ret = 3;
    }
    else
      lua_pushnil(L);
  }
  else
    lua_pushnil(L);
  /* Cleanup */
  BIO_free(bio);
  EVP_PKEY_free(pkey);
  return ret;
}

/**
 * Compute the fingerprint.
 */
static int meth_digest(lua_State* L)
{
  unsigned int bytes;
  const EVP_MD *digest = NULL;
  unsigned char buffer[EVP_MAX_MD_SIZE];
  char hex_buffer[EVP_MAX_MD_SIZE*2];
  X509 *cert = lsec_checkx509(L, 1);
  const char *str = luaL_optstring(L, 2, NULL);
  if (!str)
    digest = EVP_sha1();
  else {
    if (!strcmp(str, "sha1"))
      digest = EVP_sha1();
    else if (!strcmp(str, "sha256"))
      digest = EVP_sha256();
    else if (!strcmp(str, "sha512"))
      digest = EVP_sha512();
  }
  if (!digest) {
    lua_pushnil(L);
    lua_pushfstring(L, "digest algorithm not supported (%s)", str);
    return 2;
  }
  if (!X509_digest(cert, digest, buffer, &bytes)) {
    lua_pushnil(L);
    lua_pushfstring(L, "error processing the certificate (%s)",
      ERR_reason_error_string(ERR_get_error()));
    return 2;
  }
  to_hex((char*)buffer, bytes, hex_buffer);
  lua_pushlstring(L, hex_buffer, bytes*2);
  return 1;
}

/**
 * Check if the certificate is valid in a given time.
 */
static int meth_valid_at(lua_State* L)
{
  X509* cert = lsec_checkx509(L, 1);
  time_t time = luaL_checkinteger(L, 2);
  lua_pushboolean(L, (X509_cmp_time(X509_get_notAfter(cert), &time)     >= 0
                      && X509_cmp_time(X509_get_notBefore(cert), &time) <= 0));
  return 1;
}

/**
 * Return the serial number.
 */
static int meth_serial(lua_State *L)
{
  char *tmp;
  BIGNUM *bn;
  ASN1_INTEGER *serial;
  X509* cert = lsec_checkx509(L, 1);
  serial = X509_get_serialNumber(cert);
  bn = ASN1_INTEGER_to_BN(serial, NULL);
  tmp = BN_bn2hex(bn);
  lua_pushstring(L, tmp);
  BN_free(bn);
  OPENSSL_free(tmp);
  return 1;
}

/**
 * Return not before date.
 */
static int meth_notbefore(lua_State *L)
{
  X509* cert = lsec_checkx509(L, 1);
  return push_asn1_time(L, X509_get_notBefore(cert));
}

/**
 * Return not after date.
 */
static int meth_notafter(lua_State *L)
{
  X509* cert = lsec_checkx509(L, 1);
  return push_asn1_time(L, X509_get_notAfter(cert));
}

/**
 * Check if this certificate issued some other certificate
 */
static int meth_issued(lua_State* L)
{
  int ret, i, len;

  X509_STORE_CTX* ctx = NULL;
  X509_STORE* root = NULL;
  STACK_OF(X509)* chain = NULL;

  X509* issuer = lsec_checkx509(L, 1);
  X509* subject = lsec_checkx509(L, 2);
  X509* cert = NULL;

  len = lua_gettop(L);

  /* Check that all arguments are certificates */

  for (i = 3; i <= len; i++) {
    lsec_checkx509(L, i);
  }

  /* Before allocating things that require freeing afterwards */

  chain = sk_X509_new_null();
  ctx = X509_STORE_CTX_new();
  root = X509_STORE_new();

  if (ctx == NULL || root == NULL) {
    lua_pushnil(L);
    lua_pushstring(L, "X509_STORE_new() or X509_STORE_CTX_new() error");
    ret = 2;
    goto cleanup;
  }

  ret = X509_STORE_add_cert(root, issuer);

  if(!ret) {
    lua_pushnil(L);
    lua_pushstring(L, "X509_STORE_add_cert() error");
    ret = 2;
    goto cleanup;
  }

  for (i = 3; i <= len && lua_isuserdata(L, i); i++) {
    cert = lsec_checkx509(L, i);
    sk_X509_push(chain, cert);
  }

  ret = X509_STORE_CTX_init(ctx, root, subject, chain);

  if(!ret) {
    lua_pushnil(L);
    lua_pushstring(L, "X509_STORE_CTX_init() error");
    ret = 2;
    goto cleanup;
  }

  /* Actual verification */
  if (X509_verify_cert(ctx) <= 0) {
    ret = X509_STORE_CTX_get_error(ctx);
    lua_pushnil(L);
    lua_pushstring(L, X509_verify_cert_error_string(ret));
    ret = 2;
  } else {
    lua_pushboolean(L, 1);
    ret = 1;
  }

cleanup:

  if (ctx != NULL) {
    X509_STORE_CTX_free(ctx);
  }

  if (chain != NULL) {
    X509_STORE_free(root);
  }

  sk_X509_free(chain);

  return ret;
}

/**
 * Collect X509 objects.
 */
static int meth_destroy(lua_State* L)
{
  X509_free(lsec_checkx509(L, 1));
  return 0;
}

static int meth_tostring(lua_State *L)
{
  X509* cert = lsec_checkx509(L, 1);
  lua_pushfstring(L, "X509 certificate: %p", cert);
  return 1;
}

/**
 * Set the encode for ASN.1 string.
 */
static int meth_set_encode(lua_State* L)
{
  int succ = 0;
  p_x509 px = lsec_checkp_x509(L, 1);
  const char *enc = luaL_checkstring(L, 2);
  if (strncmp(enc, "ai5", 3) == 0) {
    succ = 1;
    px->encode = LSEC_AI5_STRING;
  } else if (strncmp(enc, "utf8", 4) == 0) {
    succ = 1;
    px->encode = LSEC_UTF8_STRING;
  }
  lua_pushboolean(L, succ);
  return 1;
}

/*---------------------------------------------------------------------------*/

static int load_cert(lua_State* L)
{
  X509 *cert;
  size_t bytes;
  const char* data;
  BIO *bio = BIO_new(BIO_s_mem());
  data = luaL_checklstring(L, 1, &bytes);
  BIO_write(bio, data, bytes);
  cert = PEM_read_bio_X509(bio, NULL, NULL, NULL);
  if (cert)
    lsec_pushx509(L, cert);
  else
    lua_pushnil(L);
  BIO_free(bio);
  return 1;
}

/*---------------------------------------------------------------------------*/

/**
 * Certificate methods.
 */
static luaL_Reg methods[] = {
  {"digest",     meth_digest},
  {"setencode",  meth_set_encode},
  {"extensions", meth_extensions},
  {"issuer",     meth_issuer},
  {"notbefore",  meth_notbefore},
  {"notafter",   meth_notafter},
  {"issued",     meth_issued},
  {"pem",        meth_pem},
  {"pubkey",     meth_pubkey},
  {"serial",     meth_serial},
  {"subject",    meth_subject},
  {"validat",    meth_valid_at},
  {NULL,         NULL}
};

/**
 * X509 metamethods.
 */
static luaL_Reg meta[] = {
  {"__gc",       meth_destroy},
  {"__tostring", meth_tostring},
  {NULL, NULL}
};

/**
 * X509 functions.
 */
static luaL_Reg funcs[] = {
  {"load", load_cert},
  {NULL,   NULL}
};

/*--------------------------------------------------------------------------*/

LSEC_API int luaopen_ssl_x509(lua_State *L)
{
  /* Register the functions and tables */
  luaL_newmetatable(L, "SSL:Certificate");
  setfuncs(L, meta);

  luaL_newlib(L, methods);
  lua_setfield(L, -2, "__index");

  luaL_newlib(L, funcs);

  return 1;
}