source: EcnlProtoTool/trunk/openssl-1.1.0e/crypto/asn1/tasn_dec.c@ 331

Last change on this file since 331 was 331, checked in by coas-nagasima, 6 years ago

prototoolに関連するプロジェクトをnewlibからmuslを使うよう変更・更新
ntshellをnewlibの下位の実装から、muslのsyscallの実装に変更・更新
以下のOSSをアップデート
・mruby-1.3.0
・musl-1.1.18
・onigmo-6.1.3
・tcc-0.9.27
以下のOSSを追加
・openssl-1.1.0e
・curl-7.57.0
・zlib-1.2.11
以下のmrbgemsを追加
・iij/mruby-digest
・iij/mruby-env
・iij/mruby-errno
・iij/mruby-iijson
・iij/mruby-ipaddr
・iij/mruby-mock
・iij/mruby-require
・iij/mruby-tls-openssl
  • Property svn:eol-style set to native
  • Property svn:mime-type set to text/x-csrc
File size: 35.7 KB
Line 
1/*
2 * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stddef.h>
11#include <string.h>
12#include <openssl/asn1.h>
13#include <openssl/asn1t.h>
14#include <openssl/objects.h>
15#include <openssl/buffer.h>
16#include <openssl/err.h>
17#include "internal/numbers.h"
18#include "asn1_locl.h"
19
20static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
21 long len, const ASN1_ITEM *it,
22 int tag, int aclass, char opt, ASN1_TLC *ctx);
23
24static int asn1_check_eoc(const unsigned char **in, long len);
25static int asn1_find_end(const unsigned char **in, long len, char inf);
26
27static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
28 char inf, int tag, int aclass, int depth);
29
30static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen);
31
32static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
33 char *inf, char *cst,
34 const unsigned char **in, long len,
35 int exptag, int expclass, char opt, ASN1_TLC *ctx);
36
37static int asn1_template_ex_d2i(ASN1_VALUE **pval,
38 const unsigned char **in, long len,
39 const ASN1_TEMPLATE *tt, char opt,
40 ASN1_TLC *ctx);
41static int asn1_template_noexp_d2i(ASN1_VALUE **val,
42 const unsigned char **in, long len,
43 const ASN1_TEMPLATE *tt, char opt,
44 ASN1_TLC *ctx);
45static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
46 const unsigned char **in, long len,
47 const ASN1_ITEM *it,
48 int tag, int aclass, char opt,
49 ASN1_TLC *ctx);
50static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
51 int utype, char *free_cont, const ASN1_ITEM *it);
52
53/* Table to convert tags to bit values, used for MSTRING type */
54static const unsigned long tag2bit[32] = {
55 /* tags 0 - 3 */
56 0, 0, 0, B_ASN1_BIT_STRING,
57 /* tags 4- 7 */
58 B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN,
59 /* tags 8-11 */
60 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,
61 /* tags 12-15 */
62 B_ASN1_UTF8STRING, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,
63 /* tags 16-19 */
64 B_ASN1_SEQUENCE, 0, B_ASN1_NUMERICSTRING, B_ASN1_PRINTABLESTRING,
65 /* tags 20-22 */
66 B_ASN1_T61STRING, B_ASN1_VIDEOTEXSTRING, B_ASN1_IA5STRING,
67 /* tags 23-24 */
68 B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME,
69 /* tags 25-27 */
70 B_ASN1_GRAPHICSTRING, B_ASN1_ISO64STRING, B_ASN1_GENERALSTRING,
71 /* tags 28-31 */
72 B_ASN1_UNIVERSALSTRING, B_ASN1_UNKNOWN, B_ASN1_BMPSTRING, B_ASN1_UNKNOWN,
73};
74
75unsigned long ASN1_tag2bit(int tag)
76{
77 if ((tag < 0) || (tag > 30))
78 return 0;
79 return tag2bit[tag];
80}
81
82/* Macro to initialize and invalidate the cache */
83
84#define asn1_tlc_clear(c) if (c) (c)->valid = 0
85/* Version to avoid compiler warning about 'c' always non-NULL */
86#define asn1_tlc_clear_nc(c) (c)->valid = 0
87
88/*
89 * Decode an ASN1 item, this currently behaves just like a standard 'd2i'
90 * function. 'in' points to a buffer to read the data from, in future we
91 * will have more advanced versions that can input data a piece at a time and
92 * this will simply be a special case.
93 */
94
95ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval,
96 const unsigned char **in, long len,
97 const ASN1_ITEM *it)
98{
99 ASN1_TLC c;
100 ASN1_VALUE *ptmpval = NULL;
101 if (!pval)
102 pval = &ptmpval;
103 asn1_tlc_clear_nc(&c);
104 if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0)
105 return *pval;
106 return NULL;
107}
108
109int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
110 const ASN1_ITEM *it,
111 int tag, int aclass, char opt, ASN1_TLC *ctx)
112{
113 int rv;
114 rv = asn1_item_embed_d2i(pval, in, len, it, tag, aclass, opt, ctx);
115 if (rv <= 0)
116 ASN1_item_ex_free(pval, it);
117 return rv;
118}
119
120/*
121 * Decode an item, taking care of IMPLICIT tagging, if any. If 'opt' set and
122 * tag mismatch return -1 to handle OPTIONAL
123 */
124
125static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
126 long len, const ASN1_ITEM *it,
127 int tag, int aclass, char opt, ASN1_TLC *ctx)
128{
129 const ASN1_TEMPLATE *tt, *errtt = NULL;
130 const ASN1_EXTERN_FUNCS *ef;
131 const ASN1_AUX *aux = it->funcs;
132 ASN1_aux_cb *asn1_cb;
133 const unsigned char *p = NULL, *q;
134 unsigned char oclass;
135 char seq_eoc, seq_nolen, cst, isopt;
136 long tmplen;
137 int i;
138 int otag;
139 int ret = 0;
140 ASN1_VALUE **pchptr;
141 if (!pval)
142 return 0;
143 if (aux && aux->asn1_cb)
144 asn1_cb = aux->asn1_cb;
145 else
146 asn1_cb = 0;
147
148 switch (it->itype) {
149 case ASN1_ITYPE_PRIMITIVE:
150 if (it->templates) {
151 /*
152 * tagging or OPTIONAL is currently illegal on an item template
153 * because the flags can't get passed down. In practice this
154 * isn't a problem: we include the relevant flags from the item
155 * template in the template itself.
156 */
157 if ((tag != -1) || opt) {
158 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I,
159 ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
160 goto err;
161 }
162 return asn1_template_ex_d2i(pval, in, len,
163 it->templates, opt, ctx);
164 }
165 return asn1_d2i_ex_primitive(pval, in, len, it,
166 tag, aclass, opt, ctx);
167
168 case ASN1_ITYPE_MSTRING:
169 p = *in;
170 /* Just read in tag and class */
171 ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
172 &p, len, -1, 0, 1, ctx);
173 if (!ret) {
174 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
175 goto err;
176 }
177
178 /* Must be UNIVERSAL class */
179 if (oclass != V_ASN1_UNIVERSAL) {
180 /* If OPTIONAL, assume this is OK */
181 if (opt)
182 return -1;
183 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_MSTRING_NOT_UNIVERSAL);
184 goto err;
185 }
186 /* Check tag matches bit map */
187 if (!(ASN1_tag2bit(otag) & it->utype)) {
188 /* If OPTIONAL, assume this is OK */
189 if (opt)
190 return -1;
191 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_MSTRING_WRONG_TAG);
192 goto err;
193 }
194 return asn1_d2i_ex_primitive(pval, in, len, it, otag, 0, 0, ctx);
195
196 case ASN1_ITYPE_EXTERN:
197 /* Use new style d2i */
198 ef = it->funcs;
199 return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx);
200
201 case ASN1_ITYPE_CHOICE:
202 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
203 goto auxerr;
204 if (*pval) {
205 /* Free up and zero CHOICE value if initialised */
206 i = asn1_get_choice_selector(pval, it);
207 if ((i >= 0) && (i < it->tcount)) {
208 tt = it->templates + i;
209 pchptr = asn1_get_field_ptr(pval, tt);
210 asn1_template_free(pchptr, tt);
211 asn1_set_choice_selector(pval, -1, it);
212 }
213 } else if (!ASN1_item_ex_new(pval, it)) {
214 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
215 goto err;
216 }
217 /* CHOICE type, try each possibility in turn */
218 p = *in;
219 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
220 pchptr = asn1_get_field_ptr(pval, tt);
221 /*
222 * We mark field as OPTIONAL so its absence can be recognised.
223 */
224 ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
225 /* If field not present, try the next one */
226 if (ret == -1)
227 continue;
228 /* If positive return, read OK, break loop */
229 if (ret > 0)
230 break;
231 /*
232 * Must be an ASN1 parsing error.
233 * Free up any partial choice value
234 */
235 asn1_template_free(pchptr, tt);
236 errtt = tt;
237 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
238 goto err;
239 }
240
241 /* Did we fall off the end without reading anything? */
242 if (i == it->tcount) {
243 /* If OPTIONAL, this is OK */
244 if (opt) {
245 /* Free and zero it */
246 ASN1_item_ex_free(pval, it);
247 return -1;
248 }
249 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_NO_MATCHING_CHOICE_TYPE);
250 goto err;
251 }
252
253 asn1_set_choice_selector(pval, i, it);
254
255 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
256 goto auxerr;
257 *in = p;
258 return 1;
259
260 case ASN1_ITYPE_NDEF_SEQUENCE:
261 case ASN1_ITYPE_SEQUENCE:
262 p = *in;
263 tmplen = len;
264
265 /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
266 if (tag == -1) {
267 tag = V_ASN1_SEQUENCE;
268 aclass = V_ASN1_UNIVERSAL;
269 }
270 /* Get SEQUENCE length and update len, p */
271 ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
272 &p, len, tag, aclass, opt, ctx);
273 if (!ret) {
274 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
275 goto err;
276 } else if (ret == -1)
277 return -1;
278 if (aux && (aux->flags & ASN1_AFLG_BROKEN)) {
279 len = tmplen - (p - *in);
280 seq_nolen = 1;
281 }
282 /* If indefinite we don't do a length check */
283 else
284 seq_nolen = seq_eoc;
285 if (!cst) {
286 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
287 goto err;
288 }
289
290 if (!*pval && !ASN1_item_ex_new(pval, it)) {
291 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ERR_R_NESTED_ASN1_ERROR);
292 goto err;
293 }
294
295 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
296 goto auxerr;
297
298 /* Free up and zero any ADB found */
299 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
300 if (tt->flags & ASN1_TFLG_ADB_MASK) {
301 const ASN1_TEMPLATE *seqtt;
302 ASN1_VALUE **pseqval;
303 seqtt = asn1_do_adb(pval, tt, 0);
304 if (seqtt == NULL)
305 continue;
306 pseqval = asn1_get_field_ptr(pval, seqtt);
307 asn1_template_free(pseqval, seqtt);
308 }
309 }
310
311 /* Get each field entry */
312 for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) {
313 const ASN1_TEMPLATE *seqtt;
314 ASN1_VALUE **pseqval;
315 seqtt = asn1_do_adb(pval, tt, 1);
316 if (seqtt == NULL)
317 goto err;
318 pseqval = asn1_get_field_ptr(pval, seqtt);
319 /* Have we ran out of data? */
320 if (!len)
321 break;
322 q = p;
323 if (asn1_check_eoc(&p, len)) {
324 if (!seq_eoc) {
325 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_UNEXPECTED_EOC);
326 goto err;
327 }
328 len -= p - q;
329 seq_eoc = 0;
330 q = p;
331 break;
332 }
333 /*
334 * This determines the OPTIONAL flag value. The field cannot be
335 * omitted if it is the last of a SEQUENCE and there is still
336 * data to be read. This isn't strictly necessary but it
337 * increases efficiency in some cases.
338 */
339 if (i == (it->tcount - 1))
340 isopt = 0;
341 else
342 isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
343 /*
344 * attempt to read in field, allowing each to be OPTIONAL
345 */
346
347 ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx);
348 if (!ret) {
349 errtt = seqtt;
350 goto err;
351 } else if (ret == -1) {
352 /*
353 * OPTIONAL component absent. Free and zero the field.
354 */
355 asn1_template_free(pseqval, seqtt);
356 continue;
357 }
358 /* Update length */
359 len -= p - q;
360 }
361
362 /* Check for EOC if expecting one */
363 if (seq_eoc && !asn1_check_eoc(&p, len)) {
364 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_MISSING_EOC);
365 goto err;
366 }
367 /* Check all data read */
368 if (!seq_nolen && len) {
369 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_SEQUENCE_LENGTH_MISMATCH);
370 goto err;
371 }
372
373 /*
374 * If we get here we've got no more data in the SEQUENCE, however we
375 * may not have read all fields so check all remaining are OPTIONAL
376 * and clear any that are.
377 */
378 for (; i < it->tcount; tt++, i++) {
379 const ASN1_TEMPLATE *seqtt;
380 seqtt = asn1_do_adb(pval, tt, 1);
381 if (seqtt == NULL)
382 goto err;
383 if (seqtt->flags & ASN1_TFLG_OPTIONAL) {
384 ASN1_VALUE **pseqval;
385 pseqval = asn1_get_field_ptr(pval, seqtt);
386 asn1_template_free(pseqval, seqtt);
387 } else {
388 errtt = seqtt;
389 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_FIELD_MISSING);
390 goto err;
391 }
392 }
393 /* Save encoding */
394 if (!asn1_enc_save(pval, *in, p - *in, it))
395 goto auxerr;
396 if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL))
397 goto auxerr;
398 *in = p;
399 return 1;
400
401 default:
402 return 0;
403 }
404 auxerr:
405 ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_AUX_ERROR);
406 err:
407 if (errtt)
408 ERR_add_error_data(4, "Field=", errtt->field_name,
409 ", Type=", it->sname);
410 else
411 ERR_add_error_data(2, "Type=", it->sname);
412 return 0;
413}
414
415/*
416 * Templates are handled with two separate functions. One handles any
417 * EXPLICIT tag and the other handles the rest.
418 */
419
420static int asn1_template_ex_d2i(ASN1_VALUE **val,
421 const unsigned char **in, long inlen,
422 const ASN1_TEMPLATE *tt, char opt,
423 ASN1_TLC *ctx)
424{
425 int flags, aclass;
426 int ret;
427 long len;
428 const unsigned char *p, *q;
429 char exp_eoc;
430 if (!val)
431 return 0;
432 flags = tt->flags;
433 aclass = flags & ASN1_TFLG_TAG_CLASS;
434
435 p = *in;
436
437 /* Check if EXPLICIT tag expected */
438 if (flags & ASN1_TFLG_EXPTAG) {
439 char cst;
440 /*
441 * Need to work out amount of data available to the inner content and
442 * where it starts: so read in EXPLICIT header to get the info.
443 */
444 ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,
445 &p, inlen, tt->tag, aclass, opt, ctx);
446 q = p;
447 if (!ret) {
448 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
449 return 0;
450 } else if (ret == -1)
451 return -1;
452 if (!cst) {
453 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
454 ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
455 return 0;
456 }
457 /* We've found the field so it can't be OPTIONAL now */
458 ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
459 if (!ret) {
460 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
461 return 0;
462 }
463 /* We read the field in OK so update length */
464 len -= p - q;
465 if (exp_eoc) {
466 /* If NDEF we must have an EOC here */
467 if (!asn1_check_eoc(&p, len)) {
468 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I, ASN1_R_MISSING_EOC);
469 goto err;
470 }
471 } else {
472 /*
473 * Otherwise we must hit the EXPLICIT tag end or its an error
474 */
475 if (len) {
476 ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
477 ASN1_R_EXPLICIT_LENGTH_MISMATCH);
478 goto err;
479 }
480 }
481 } else
482 return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx);
483
484 *in = p;
485 return 1;
486
487 err:
488 return 0;
489}
490
491static int asn1_template_noexp_d2i(ASN1_VALUE **val,
492 const unsigned char **in, long len,
493 const ASN1_TEMPLATE *tt, char opt,
494 ASN1_TLC *ctx)
495{
496 int flags, aclass;
497 int ret;
498 ASN1_VALUE *tval;
499 const unsigned char *p, *q;
500 if (!val)
501 return 0;
502 flags = tt->flags;
503 aclass = flags & ASN1_TFLG_TAG_CLASS;
504
505 p = *in;
506 q = p;
507
508 /*
509 * If field is embedded then val needs fixing so it is a pointer to
510 * a pointer to a field.
511 */
512 if (tt->flags & ASN1_TFLG_EMBED) {
513 tval = (ASN1_VALUE *)val;
514 val = &tval;
515 }
516
517 if (flags & ASN1_TFLG_SK_MASK) {
518 /* SET OF, SEQUENCE OF */
519 int sktag, skaclass;
520 char sk_eoc;
521 /* First work out expected inner tag value */
522 if (flags & ASN1_TFLG_IMPTAG) {
523 sktag = tt->tag;
524 skaclass = aclass;
525 } else {
526 skaclass = V_ASN1_UNIVERSAL;
527 if (flags & ASN1_TFLG_SET_OF)
528 sktag = V_ASN1_SET;
529 else
530 sktag = V_ASN1_SEQUENCE;
531 }
532 /* Get the tag */
533 ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,
534 &p, len, sktag, skaclass, opt, ctx);
535 if (!ret) {
536 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR);
537 return 0;
538 } else if (ret == -1)
539 return -1;
540 if (!*val)
541 *val = (ASN1_VALUE *)OPENSSL_sk_new_null();
542 else {
543 /*
544 * We've got a valid STACK: free up any items present
545 */
546 STACK_OF(ASN1_VALUE) *sktmp = (STACK_OF(ASN1_VALUE) *)*val;
547 ASN1_VALUE *vtmp;
548 while (sk_ASN1_VALUE_num(sktmp) > 0) {
549 vtmp = sk_ASN1_VALUE_pop(sktmp);
550 ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item));
551 }
552 }
553
554 if (!*val) {
555 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_MALLOC_FAILURE);
556 goto err;
557 }
558
559 /* Read as many items as we can */
560 while (len > 0) {
561 ASN1_VALUE *skfield;
562 q = p;
563 /* See if EOC found */
564 if (asn1_check_eoc(&p, len)) {
565 if (!sk_eoc) {
566 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
567 ASN1_R_UNEXPECTED_EOC);
568 goto err;
569 }
570 len -= p - q;
571 sk_eoc = 0;
572 break;
573 }
574 skfield = NULL;
575 if (!asn1_item_embed_d2i(&skfield, &p, len,
576 ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx)) {
577 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
578 ERR_R_NESTED_ASN1_ERROR);
579 /* |skfield| may be partially allocated despite failure. */
580 ASN1_item_free(skfield, ASN1_ITEM_ptr(tt->item));
581 goto err;
582 }
583 len -= p - q;
584 if (!sk_ASN1_VALUE_push((STACK_OF(ASN1_VALUE) *)*val, skfield)) {
585 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_MALLOC_FAILURE);
586 ASN1_item_free(skfield, ASN1_ITEM_ptr(tt->item));
587 goto err;
588 }
589 }
590 if (sk_eoc) {
591 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC);
592 goto err;
593 }
594 } else if (flags & ASN1_TFLG_IMPTAG) {
595 /* IMPLICIT tagging */
596 ret = asn1_item_embed_d2i(val, &p, len,
597 ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt,
598 ctx);
599 if (!ret) {
600 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR);
601 goto err;
602 } else if (ret == -1)
603 return -1;
604 } else {
605 /* Nothing special */
606 ret = asn1_item_embed_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
607 -1, 0, opt, ctx);
608 if (!ret) {
609 ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ERR_R_NESTED_ASN1_ERROR);
610 goto err;
611 } else if (ret == -1)
612 return -1;
613 }
614
615 *in = p;
616 return 1;
617
618 err:
619 return 0;
620}
621
622static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
623 const unsigned char **in, long inlen,
624 const ASN1_ITEM *it,
625 int tag, int aclass, char opt, ASN1_TLC *ctx)
626{
627 int ret = 0, utype;
628 long plen;
629 char cst, inf, free_cont = 0;
630 const unsigned char *p;
631 BUF_MEM buf = { 0, NULL, 0, 0 };
632 const unsigned char *cont = NULL;
633 long len;
634 if (!pval) {
635 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
636 return 0; /* Should never happen */
637 }
638
639 if (it->itype == ASN1_ITYPE_MSTRING) {
640 utype = tag;
641 tag = -1;
642 } else
643 utype = it->utype;
644
645 if (utype == V_ASN1_ANY) {
646 /* If type is ANY need to figure out type from tag */
647 unsigned char oclass;
648 if (tag >= 0) {
649 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_TAGGED_ANY);
650 return 0;
651 }
652 if (opt) {
653 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
654 ASN1_R_ILLEGAL_OPTIONAL_ANY);
655 return 0;
656 }
657 p = *in;
658 ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL,
659 &p, inlen, -1, 0, 0, ctx);
660 if (!ret) {
661 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
662 return 0;
663 }
664 if (oclass != V_ASN1_UNIVERSAL)
665 utype = V_ASN1_OTHER;
666 }
667 if (tag == -1) {
668 tag = utype;
669 aclass = V_ASN1_UNIVERSAL;
670 }
671 p = *in;
672 /* Check header */
673 ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst,
674 &p, inlen, tag, aclass, opt, ctx);
675 if (!ret) {
676 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
677 return 0;
678 } else if (ret == -1)
679 return -1;
680 ret = 0;
681 /* SEQUENCE, SET and "OTHER" are left in encoded form */
682 if ((utype == V_ASN1_SEQUENCE)
683 || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) {
684 /*
685 * Clear context cache for type OTHER because the auto clear when we
686 * have a exact match won't work
687 */
688 if (utype == V_ASN1_OTHER) {
689 asn1_tlc_clear(ctx);
690 }
691 /* SEQUENCE and SET must be constructed */
692 else if (!cst) {
693 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,
694 ASN1_R_TYPE_NOT_CONSTRUCTED);
695 return 0;
696 }
697
698 cont = *in;
699 /* If indefinite length constructed find the real end */
700 if (inf) {
701 if (!asn1_find_end(&p, plen, inf))
702 goto err;
703 len = p - cont;
704 } else {
705 len = p - cont + plen;
706 p += plen;
707 }
708 } else if (cst) {
709 if (utype == V_ASN1_NULL || utype == V_ASN1_BOOLEAN
710 || utype == V_ASN1_OBJECT || utype == V_ASN1_INTEGER
711 || utype == V_ASN1_ENUMERATED) {
712 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_TYPE_NOT_PRIMITIVE);
713 return 0;
714 }
715
716 /* Free any returned 'buf' content */
717 free_cont = 1;
718 /*
719 * Should really check the internal tags are correct but some things
720 * may get this wrong. The relevant specs say that constructed string
721 * types should be OCTET STRINGs internally irrespective of the type.
722 * So instead just check for UNIVERSAL class and ignore the tag.
723 */
724 if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0)) {
725 goto err;
726 }
727 len = buf.length;
728 /* Append a final null to string */
729 if (!BUF_MEM_grow_clean(&buf, len + 1)) {
730 ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
731 goto err;
732 }
733 buf.data[len] = 0;
734 cont = (const unsigned char *)buf.data;
735 } else {
736 cont = p;
737 len = plen;
738 p += plen;
739 }
740
741 /* We now have content length and type: translate into a structure */
742 /* asn1_ex_c2i may reuse allocated buffer, and so sets free_cont to 0 */
743 if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it))
744 goto err;
745
746 *in = p;
747 ret = 1;
748 err:
749 if (free_cont)
750 OPENSSL_free(buf.data);
751 return ret;
752}
753
754/* Translate ASN1 content octets into a structure */
755
756static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
757 int utype, char *free_cont, const ASN1_ITEM *it)
758{
759 ASN1_VALUE **opval = NULL;
760 ASN1_STRING *stmp;
761 ASN1_TYPE *typ = NULL;
762 int ret = 0;
763 const ASN1_PRIMITIVE_FUNCS *pf;
764 ASN1_INTEGER **tint;
765 pf = it->funcs;
766
767 if (pf && pf->prim_c2i)
768 return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
769 /* If ANY type clear type and set pointer to internal value */
770 if (it->utype == V_ASN1_ANY) {
771 if (!*pval) {
772 typ = ASN1_TYPE_new();
773 if (typ == NULL)
774 goto err;
775 *pval = (ASN1_VALUE *)typ;
776 } else
777 typ = (ASN1_TYPE *)*pval;
778
779 if (utype != typ->type)
780 ASN1_TYPE_set(typ, utype, NULL);
781 opval = pval;
782 pval = &typ->value.asn1_value;
783 }
784 switch (utype) {
785 case V_ASN1_OBJECT:
786 if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len))
787 goto err;
788 break;
789
790 case V_ASN1_NULL:
791 if (len) {
792 ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_NULL_IS_WRONG_LENGTH);
793 goto err;
794 }
795 *pval = (ASN1_VALUE *)1;
796 break;
797
798 case V_ASN1_BOOLEAN:
799 if (len != 1) {
800 ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
801 goto err;
802 } else {
803 ASN1_BOOLEAN *tbool;
804 tbool = (ASN1_BOOLEAN *)pval;
805 *tbool = *cont;
806 }
807 break;
808
809 case V_ASN1_BIT_STRING:
810 if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len))
811 goto err;
812 break;
813
814 case V_ASN1_INTEGER:
815 case V_ASN1_ENUMERATED:
816 tint = (ASN1_INTEGER **)pval;
817 if (!c2i_ASN1_INTEGER(tint, &cont, len))
818 goto err;
819 /* Fixup type to match the expected form */
820 (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
821 break;
822
823 case V_ASN1_OCTET_STRING:
824 case V_ASN1_NUMERICSTRING:
825 case V_ASN1_PRINTABLESTRING:
826 case V_ASN1_T61STRING:
827 case V_ASN1_VIDEOTEXSTRING:
828 case V_ASN1_IA5STRING:
829 case V_ASN1_UTCTIME:
830 case V_ASN1_GENERALIZEDTIME:
831 case V_ASN1_GRAPHICSTRING:
832 case V_ASN1_VISIBLESTRING:
833 case V_ASN1_GENERALSTRING:
834 case V_ASN1_UNIVERSALSTRING:
835 case V_ASN1_BMPSTRING:
836 case V_ASN1_UTF8STRING:
837 case V_ASN1_OTHER:
838 case V_ASN1_SET:
839 case V_ASN1_SEQUENCE:
840 default:
841 if (utype == V_ASN1_BMPSTRING && (len & 1)) {
842 ASN1err(ASN1_F_ASN1_EX_C2I, ASN1_R_BMPSTRING_IS_WRONG_LENGTH);
843 goto err;
844 }
845 if (utype == V_ASN1_UNIVERSALSTRING && (len & 3)) {
846 ASN1err(ASN1_F_ASN1_EX_C2I,
847 ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH);
848 goto err;
849 }
850 /* All based on ASN1_STRING and handled the same */
851 if (!*pval) {
852 stmp = ASN1_STRING_type_new(utype);
853 if (stmp == NULL) {
854 ASN1err(ASN1_F_ASN1_EX_C2I, ERR_R_MALLOC_FAILURE);
855 goto err;
856 }
857 *pval = (ASN1_VALUE *)stmp;
858 } else {
859 stmp = (ASN1_STRING *)*pval;
860 stmp->type = utype;
861 }
862 /* If we've already allocated a buffer use it */
863 if (*free_cont) {
864 OPENSSL_free(stmp->data);
865 stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */
866 stmp->length = len;
867 *free_cont = 0;
868 } else {
869 if (!ASN1_STRING_set(stmp, cont, len)) {
870 ASN1err(ASN1_F_ASN1_EX_C2I, ERR_R_MALLOC_FAILURE);
871 ASN1_STRING_free(stmp);
872 *pval = NULL;
873 goto err;
874 }
875 }
876 break;
877 }
878 /* If ASN1_ANY and NULL type fix up value */
879 if (typ && (utype == V_ASN1_NULL))
880 typ->value.ptr = NULL;
881
882 ret = 1;
883 err:
884 if (!ret) {
885 ASN1_TYPE_free(typ);
886 if (opval)
887 *opval = NULL;
888 }
889 return ret;
890}
891
892/*
893 * This function finds the end of an ASN1 structure when passed its maximum
894 * length, whether it is indefinite length and a pointer to the content. This
895 * is more efficient than calling asn1_collect because it does not recurse on
896 * each indefinite length header.
897 */
898
899static int asn1_find_end(const unsigned char **in, long len, char inf)
900{
901 uint32_t expected_eoc;
902 long plen;
903 const unsigned char *p = *in, *q;
904 /* If not indefinite length constructed just add length */
905 if (inf == 0) {
906 *in += len;
907 return 1;
908 }
909 expected_eoc = 1;
910 /*
911 * Indefinite length constructed form. Find the end when enough EOCs are
912 * found. If more indefinite length constructed headers are encountered
913 * increment the expected eoc count otherwise just skip to the end of the
914 * data.
915 */
916 while (len > 0) {
917 if (asn1_check_eoc(&p, len)) {
918 expected_eoc--;
919 if (expected_eoc == 0)
920 break;
921 len -= 2;
922 continue;
923 }
924 q = p;
925 /* Just read in a header: only care about the length */
926 if (!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
927 -1, 0, 0, NULL)) {
928 ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
929 return 0;
930 }
931 if (inf) {
932 if (expected_eoc == UINT32_MAX) {
933 ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
934 return 0;
935 }
936 expected_eoc++;
937 } else {
938 p += plen;
939 }
940 len -= p - q;
941 }
942 if (expected_eoc) {
943 ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC);
944 return 0;
945 }
946 *in = p;
947 return 1;
948}
949
950/*
951 * This function collects the asn1 data from a constructed string type into
952 * a buffer. The values of 'in' and 'len' should refer to the contents of the
953 * constructed type and 'inf' should be set if it is indefinite length.
954 */
955
956#ifndef ASN1_MAX_STRING_NEST
957/*
958 * This determines how many levels of recursion are permitted in ASN1 string
959 * types. If it is not limited stack overflows can occur. If set to zero no
960 * recursion is allowed at all. Although zero should be adequate examples
961 * exist that require a value of 1. So 5 should be more than enough.
962 */
963# define ASN1_MAX_STRING_NEST 5
964#endif
965
966static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
967 char inf, int tag, int aclass, int depth)
968{
969 const unsigned char *p, *q;
970 long plen;
971 char cst, ininf;
972 p = *in;
973 inf &= 1;
974 /*
975 * If no buffer and not indefinite length constructed just pass over the
976 * encoded data
977 */
978 if (!buf && !inf) {
979 *in += len;
980 return 1;
981 }
982 while (len > 0) {
983 q = p;
984 /* Check for EOC */
985 if (asn1_check_eoc(&p, len)) {
986 /*
987 * EOC is illegal outside indefinite length constructed form
988 */
989 if (!inf) {
990 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_UNEXPECTED_EOC);
991 return 0;
992 }
993 inf = 0;
994 break;
995 }
996
997 if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,
998 len, tag, aclass, 0, NULL)) {
999 ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
1000 return 0;
1001 }
1002
1003 /* If indefinite length constructed update max length */
1004 if (cst) {
1005 if (depth >= ASN1_MAX_STRING_NEST) {
1006 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING);
1007 return 0;
1008 }
1009 if (!asn1_collect(buf, &p, plen, ininf, tag, aclass, depth + 1))
1010 return 0;
1011 } else if (plen && !collect_data(buf, &p, plen))
1012 return 0;
1013 len -= p - q;
1014 }
1015 if (inf) {
1016 ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
1017 return 0;
1018 }
1019 *in = p;
1020 return 1;
1021}
1022
1023static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen)
1024{
1025 int len;
1026 if (buf) {
1027 len = buf->length;
1028 if (!BUF_MEM_grow_clean(buf, len + plen)) {
1029 ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
1030 return 0;
1031 }
1032 memcpy(buf->data + len, *p, plen);
1033 }
1034 *p += plen;
1035 return 1;
1036}
1037
1038/* Check for ASN1 EOC and swallow it if found */
1039
1040static int asn1_check_eoc(const unsigned char **in, long len)
1041{
1042 const unsigned char *p;
1043 if (len < 2)
1044 return 0;
1045 p = *in;
1046 if (!p[0] && !p[1]) {
1047 *in += 2;
1048 return 1;
1049 }
1050 return 0;
1051}
1052
1053/*
1054 * Check an ASN1 tag and length: a bit like ASN1_get_object but it sets the
1055 * length for indefinite length constructed form, we don't know the exact
1056 * length but we can set an upper bound to the amount of data available minus
1057 * the header length just read.
1058 */
1059
1060static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,
1061 char *inf, char *cst,
1062 const unsigned char **in, long len,
1063 int exptag, int expclass, char opt, ASN1_TLC *ctx)
1064{
1065 int i;
1066 int ptag, pclass;
1067 long plen;
1068 const unsigned char *p, *q;
1069 p = *in;
1070 q = p;
1071
1072 if (ctx && ctx->valid) {
1073 i = ctx->ret;
1074 plen = ctx->plen;
1075 pclass = ctx->pclass;
1076 ptag = ctx->ptag;
1077 p += ctx->hdrlen;
1078 } else {
1079 i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
1080 if (ctx) {
1081 ctx->ret = i;
1082 ctx->plen = plen;
1083 ctx->pclass = pclass;
1084 ctx->ptag = ptag;
1085 ctx->hdrlen = p - q;
1086 ctx->valid = 1;
1087 /*
1088 * If definite length, and no error, length + header can't exceed
1089 * total amount of data available.
1090 */
1091 if (!(i & 0x81) && ((plen + ctx->hdrlen) > len)) {
1092 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_TOO_LONG);
1093 asn1_tlc_clear(ctx);
1094 return 0;
1095 }
1096 }
1097 }
1098
1099 if (i & 0x80) {
1100 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
1101 asn1_tlc_clear(ctx);
1102 return 0;
1103 }
1104 if (exptag >= 0) {
1105 if ((exptag != ptag) || (expclass != pclass)) {
1106 /*
1107 * If type is OPTIONAL, not an error: indicate missing type.
1108 */
1109 if (opt)
1110 return -1;
1111 asn1_tlc_clear(ctx);
1112 ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
1113 return 0;
1114 }
1115 /*
1116 * We have a tag and class match: assume we are going to do something
1117 * with it
1118 */
1119 asn1_tlc_clear(ctx);
1120 }
1121
1122 if (i & 1)
1123 plen = len - (p - q);
1124
1125 if (inf)
1126 *inf = i & 1;
1127
1128 if (cst)
1129 *cst = i & V_ASN1_CONSTRUCTED;
1130
1131 if (olen)
1132 *olen = plen;
1133
1134 if (oclass)
1135 *oclass = pclass;
1136
1137 if (otag)
1138 *otag = ptag;
1139
1140 *in = p;
1141 return 1;
1142}
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