1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57 #include <ctype.h>
58 #include <string.h>
59
60 #include <openssl/asn1.h>
61 #include <openssl/asn1t.h>
62 #include <openssl/buf.h>
63 #include <openssl/err.h>
64 #include <openssl/mem.h>
65 #include <openssl/obj.h>
66 #include <openssl/stack.h>
67 #include <openssl/x509.h>
68
69 #include "../asn1/internal.h"
70 #include "../internal.h"
71 #include "internal.h"
72
73
74 typedef STACK_OF(X509_NAME_ENTRY) STACK_OF_X509_NAME_ENTRY;
75 DEFINE_STACK_OF(STACK_OF_X509_NAME_ENTRY)
76
77 /*
78 * Maximum length of X509_NAME: much larger than anything we should
79 * ever see in practice.
80 */
81
82 #define X509_NAME_MAX (1024 * 1024)
83
84 static int x509_name_ex_d2i(ASN1_VALUE **val,
85 const unsigned char **in, long len,
86 const ASN1_ITEM *it,
87 int tag, int aclass, char opt, ASN1_TLC *ctx);
88
89 static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out,
90 const ASN1_ITEM *it, int tag, int aclass);
91 static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it);
92 static void x509_name_ex_free(ASN1_VALUE **val, const ASN1_ITEM *it);
93
94 static int x509_name_encode(X509_NAME *a);
95 static int x509_name_canon(X509_NAME *a);
96 static int asn1_string_canon(ASN1_STRING *out, ASN1_STRING *in);
97 static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) * intname,
98 unsigned char **in);
99
100 ASN1_SEQUENCE(X509_NAME_ENTRY) = {
101 ASN1_SIMPLE(X509_NAME_ENTRY, object, ASN1_OBJECT),
102 ASN1_SIMPLE(X509_NAME_ENTRY, value, ASN1_PRINTABLE)
103 } ASN1_SEQUENCE_END(X509_NAME_ENTRY)
104
105 IMPLEMENT_ASN1_FUNCTIONS(X509_NAME_ENTRY)
106 IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME_ENTRY)
107
108 /*
109 * For the "Name" type we need a SEQUENCE OF { SET OF X509_NAME_ENTRY } so
110 * declare two template wrappers for this
111 */
112
113 ASN1_ITEM_TEMPLATE(X509_NAME_ENTRIES) =
114 ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SET_OF, 0, RDNS, X509_NAME_ENTRY)
115 ASN1_ITEM_TEMPLATE_END(X509_NAME_ENTRIES)
116
117 ASN1_ITEM_TEMPLATE(X509_NAME_INTERNAL) =
118 ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, Name, X509_NAME_ENTRIES)
119 ASN1_ITEM_TEMPLATE_END(X509_NAME_INTERNAL)
120
121 /*
122 * Normally that's where it would end: we'd have two nested STACK structures
123 * representing the ASN1. Unfortunately X509_NAME uses a completely different
124 * form and caches encodings so we have to process the internal form and
125 * convert to the external form.
126 */
127
128 static const ASN1_EXTERN_FUNCS x509_name_ff = {
129 NULL,
130 x509_name_ex_new,
131 x509_name_ex_free,
132 0, /* Default clear behaviour is OK */
133 x509_name_ex_d2i,
134 x509_name_ex_i2d,
135 NULL,
136 };
137
IMPLEMENT_EXTERN_ASN1(X509_NAME,V_ASN1_SEQUENCE,x509_name_ff)138 IMPLEMENT_EXTERN_ASN1(X509_NAME, V_ASN1_SEQUENCE, x509_name_ff)
139
140 IMPLEMENT_ASN1_FUNCTIONS(X509_NAME)
141
142 IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME)
143
144 static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it)
145 {
146 X509_NAME *ret = NULL;
147 ret = OPENSSL_malloc(sizeof(X509_NAME));
148 if (!ret)
149 goto memerr;
150 if ((ret->entries = sk_X509_NAME_ENTRY_new_null()) == NULL)
151 goto memerr;
152 if ((ret->bytes = BUF_MEM_new()) == NULL)
153 goto memerr;
154 ret->canon_enc = NULL;
155 ret->canon_enclen = 0;
156 ret->modified = 1;
157 *val = (ASN1_VALUE *)ret;
158 return 1;
159
160 memerr:
161 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
162 if (ret) {
163 if (ret->entries)
164 sk_X509_NAME_ENTRY_free(ret->entries);
165 OPENSSL_free(ret);
166 }
167 return 0;
168 }
169
x509_name_ex_free(ASN1_VALUE ** pval,const ASN1_ITEM * it)170 static void x509_name_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
171 {
172 X509_NAME *a;
173 if (!pval || !*pval)
174 return;
175 a = (X509_NAME *)*pval;
176
177 BUF_MEM_free(a->bytes);
178 sk_X509_NAME_ENTRY_pop_free(a->entries, X509_NAME_ENTRY_free);
179 if (a->canon_enc)
180 OPENSSL_free(a->canon_enc);
181 OPENSSL_free(a);
182 *pval = NULL;
183 }
184
local_sk_X509_NAME_ENTRY_free(STACK_OF (X509_NAME_ENTRY)* ne)185 static void local_sk_X509_NAME_ENTRY_free(STACK_OF(X509_NAME_ENTRY) *ne)
186 {
187 sk_X509_NAME_ENTRY_free(ne);
188 }
189
local_sk_X509_NAME_ENTRY_pop_free(STACK_OF (X509_NAME_ENTRY)* ne)190 static void local_sk_X509_NAME_ENTRY_pop_free(STACK_OF(X509_NAME_ENTRY) *ne)
191 {
192 sk_X509_NAME_ENTRY_pop_free(ne, X509_NAME_ENTRY_free);
193 }
194
x509_name_ex_d2i(ASN1_VALUE ** val,const unsigned char ** in,long len,const ASN1_ITEM * it,int tag,int aclass,char opt,ASN1_TLC * ctx)195 static int x509_name_ex_d2i(ASN1_VALUE **val,
196 const unsigned char **in, long len,
197 const ASN1_ITEM *it, int tag, int aclass,
198 char opt, ASN1_TLC *ctx)
199 {
200 const unsigned char *p = *in, *q;
201 STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname = NULL;
202 X509_NAME *nm = NULL;
203 size_t i, j;
204 int ret;
205 STACK_OF(X509_NAME_ENTRY) *entries;
206 X509_NAME_ENTRY *entry;
207 /* Bound the size of an X509_NAME we are willing to parse. */
208 if (len > X509_NAME_MAX) {
209 len = X509_NAME_MAX;
210 }
211 q = p;
212
213 /* Get internal representation of Name */
214 ASN1_VALUE *intname_val = NULL;
215 ret = ASN1_item_ex_d2i(&intname_val,
216 &p, len, ASN1_ITEM_rptr(X509_NAME_INTERNAL),
217 tag, aclass, opt, ctx);
218 if (ret <= 0)
219 return ret;
220 intname = (STACK_OF(STACK_OF_X509_NAME_ENTRY) *)intname_val;
221
222 if (*val)
223 x509_name_ex_free(val, NULL);
224 ASN1_VALUE *nm_val = NULL;
225 if (!x509_name_ex_new(&nm_val, NULL))
226 goto err;
227 nm = (X509_NAME *)nm_val;
228 /* We've decoded it: now cache encoding */
229 if (!BUF_MEM_grow(nm->bytes, p - q))
230 goto err;
231 OPENSSL_memcpy(nm->bytes->data, q, p - q);
232
233 /* Convert internal representation to X509_NAME structure */
234 for (i = 0; i < sk_STACK_OF_X509_NAME_ENTRY_num(intname); i++) {
235 entries = sk_STACK_OF_X509_NAME_ENTRY_value(intname, i);
236 for (j = 0; j < sk_X509_NAME_ENTRY_num(entries); j++) {
237 entry = sk_X509_NAME_ENTRY_value(entries, j);
238 entry->set = i;
239 if (!sk_X509_NAME_ENTRY_push(nm->entries, entry))
240 goto err;
241 (void)sk_X509_NAME_ENTRY_set(entries, j, NULL);
242 }
243 }
244 ret = x509_name_canon(nm);
245 if (!ret)
246 goto err;
247 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
248 local_sk_X509_NAME_ENTRY_free);
249 nm->modified = 0;
250 *val = (ASN1_VALUE *)nm;
251 *in = p;
252 return ret;
253 err:
254 X509_NAME_free(nm);
255 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
256 local_sk_X509_NAME_ENTRY_pop_free);
257 OPENSSL_PUT_ERROR(X509, ERR_R_ASN1_LIB);
258 return 0;
259 }
260
x509_name_ex_i2d(ASN1_VALUE ** val,unsigned char ** out,const ASN1_ITEM * it,int tag,int aclass)261 static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out,
262 const ASN1_ITEM *it, int tag, int aclass)
263 {
264 X509_NAME *a = (X509_NAME *)*val;
265 if (a->modified &&
266 (!x509_name_encode(a) ||
267 !x509_name_canon(a))) {
268 return -1;
269 }
270 int ret = a->bytes->length;
271 if (out != NULL) {
272 OPENSSL_memcpy(*out, a->bytes->data, ret);
273 *out += ret;
274 }
275 return ret;
276 }
277
x509_name_encode(X509_NAME * a)278 static int x509_name_encode(X509_NAME *a)
279 {
280 int len;
281 unsigned char *p;
282 STACK_OF(X509_NAME_ENTRY) *entries = NULL;
283 X509_NAME_ENTRY *entry;
284 int set = -1;
285 size_t i;
286 STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname =
287 sk_STACK_OF_X509_NAME_ENTRY_new_null();
288 if (!intname)
289 goto memerr;
290 for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
291 entry = sk_X509_NAME_ENTRY_value(a->entries, i);
292 if (entry->set != set) {
293 entries = sk_X509_NAME_ENTRY_new_null();
294 if (!entries)
295 goto memerr;
296 if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname, entries)) {
297 sk_X509_NAME_ENTRY_free(entries);
298 goto memerr;
299 }
300 set = entry->set;
301 }
302 if (!sk_X509_NAME_ENTRY_push(entries, entry))
303 goto memerr;
304 }
305 ASN1_VALUE *intname_val = (ASN1_VALUE *)intname;
306 len =
307 ASN1_item_ex_i2d(&intname_val, NULL, ASN1_ITEM_rptr(X509_NAME_INTERNAL),
308 /*tag=*/-1, /*aclass=*/0);
309 if (len <= 0) {
310 goto err;
311 }
312 if (!BUF_MEM_grow(a->bytes, len))
313 goto memerr;
314 p = (unsigned char *)a->bytes->data;
315 if (ASN1_item_ex_i2d(&intname_val, &p, ASN1_ITEM_rptr(X509_NAME_INTERNAL),
316 /*tag=*/-1, /*aclass=*/0) <= 0) {
317 goto err;
318 }
319 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
320 local_sk_X509_NAME_ENTRY_free);
321 a->modified = 0;
322 return 1;
323 memerr:
324 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
325 err:
326 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
327 local_sk_X509_NAME_ENTRY_free);
328 return 0;
329 }
330
331 /*
332 * This function generates the canonical encoding of the Name structure. In
333 * it all strings are converted to UTF8, leading, trailing and multiple
334 * spaces collapsed, converted to lower case and the leading SEQUENCE header
335 * removed. In future we could also normalize the UTF8 too. By doing this
336 * comparison of Name structures can be rapidly perfomed by just using
337 * OPENSSL_memcmp() of the canonical encoding. By omitting the leading SEQUENCE name
338 * constraints of type dirName can also be checked with a simple OPENSSL_memcmp().
339 */
340
x509_name_canon(X509_NAME * a)341 static int x509_name_canon(X509_NAME *a)
342 {
343 unsigned char *p;
344 STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname = NULL;
345 STACK_OF(X509_NAME_ENTRY) *entries = NULL;
346 X509_NAME_ENTRY *entry, *tmpentry = NULL;
347 int set = -1, ret = 0, len;
348 size_t i;
349
350 if (a->canon_enc) {
351 OPENSSL_free(a->canon_enc);
352 a->canon_enc = NULL;
353 }
354 /* Special case: empty X509_NAME => null encoding */
355 if (sk_X509_NAME_ENTRY_num(a->entries) == 0) {
356 a->canon_enclen = 0;
357 return 1;
358 }
359 intname = sk_STACK_OF_X509_NAME_ENTRY_new_null();
360 if (!intname)
361 goto err;
362 for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
363 entry = sk_X509_NAME_ENTRY_value(a->entries, i);
364 if (entry->set != set) {
365 entries = sk_X509_NAME_ENTRY_new_null();
366 if (!entries)
367 goto err;
368 if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname, entries)) {
369 sk_X509_NAME_ENTRY_free(entries);
370 goto err;
371 }
372 set = entry->set;
373 }
374 tmpentry = X509_NAME_ENTRY_new();
375 if (tmpentry == NULL)
376 goto err;
377 tmpentry->object = OBJ_dup(entry->object);
378 if (!asn1_string_canon(tmpentry->value, entry->value))
379 goto err;
380 if (!sk_X509_NAME_ENTRY_push(entries, tmpentry))
381 goto err;
382 tmpentry = NULL;
383 }
384
385 /* Finally generate encoding */
386
387 len = i2d_name_canon(intname, NULL);
388 if (len < 0) {
389 goto err;
390 }
391 a->canon_enclen = len;
392
393 p = OPENSSL_malloc(a->canon_enclen);
394
395 if (!p)
396 goto err;
397
398 a->canon_enc = p;
399
400 i2d_name_canon(intname, &p);
401
402 ret = 1;
403
404 err:
405
406 if (tmpentry)
407 X509_NAME_ENTRY_free(tmpentry);
408 if (intname)
409 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
410 local_sk_X509_NAME_ENTRY_pop_free);
411 return ret;
412 }
413
414 /* Bitmap of all the types of string that will be canonicalized. */
415
416 #define ASN1_MASK_CANON \
417 (B_ASN1_UTF8STRING | B_ASN1_BMPSTRING | B_ASN1_UNIVERSALSTRING \
418 | B_ASN1_PRINTABLESTRING | B_ASN1_T61STRING | B_ASN1_IA5STRING \
419 | B_ASN1_VISIBLESTRING)
420
asn1_string_canon(ASN1_STRING * out,ASN1_STRING * in)421 static int asn1_string_canon(ASN1_STRING *out, ASN1_STRING *in)
422 {
423 unsigned char *to, *from;
424 int len, i;
425
426 /* If type not in bitmask just copy string across */
427 if (!(ASN1_tag2bit(in->type) & ASN1_MASK_CANON)) {
428 if (!ASN1_STRING_copy(out, in))
429 return 0;
430 return 1;
431 }
432
433 out->type = V_ASN1_UTF8STRING;
434 out->length = ASN1_STRING_to_UTF8(&out->data, in);
435 if (out->length == -1)
436 return 0;
437
438 to = out->data;
439 from = to;
440
441 len = out->length;
442
443 /*
444 * Convert string in place to canonical form. Ultimately we may need to
445 * handle a wider range of characters but for now ignore anything with
446 * MSB set and rely on the isspace() and tolower() functions.
447 */
448
449 /* Ignore leading spaces */
450 while ((len > 0) && !(*from & 0x80) && isspace(*from)) {
451 from++;
452 len--;
453 }
454
455 to = from + len;
456
457 /* Ignore trailing spaces */
458 while ((len > 0) && !(to[-1] & 0x80) && isspace(to[-1])) {
459 to--;
460 len--;
461 }
462
463 to = out->data;
464
465 i = 0;
466 while (i < len) {
467 /* If MSB set just copy across */
468 if (*from & 0x80) {
469 *to++ = *from++;
470 i++;
471 }
472 /* Collapse multiple spaces */
473 else if (isspace(*from)) {
474 /* Copy one space across */
475 *to++ = ' ';
476 /*
477 * Ignore subsequent spaces. Note: don't need to check len here
478 * because we know the last character is a non-space so we can't
479 * overflow.
480 */
481 do {
482 from++;
483 i++;
484 }
485 while (!(*from & 0x80) && isspace(*from));
486 } else {
487 *to++ = OPENSSL_tolower(*from);
488 from++;
489 i++;
490 }
491 }
492
493 out->length = to - out->data;
494
495 return 1;
496
497 }
498
i2d_name_canon(STACK_OF (STACK_OF_X509_NAME_ENTRY)* _intname,unsigned char ** in)499 static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) * _intname,
500 unsigned char **in)
501 {
502 int len, ltmp;
503 size_t i;
504 ASN1_VALUE *v;
505 STACK_OF(ASN1_VALUE) *intname = (STACK_OF(ASN1_VALUE) *)_intname;
506
507 len = 0;
508 for (i = 0; i < sk_ASN1_VALUE_num(intname); i++) {
509 v = sk_ASN1_VALUE_value(intname, i);
510 ltmp = ASN1_item_ex_i2d(&v, in, ASN1_ITEM_rptr(X509_NAME_ENTRIES),
511 /*tag=*/-1, /*aclass=*/0);
512 if (ltmp < 0)
513 return ltmp;
514 len += ltmp;
515 }
516 return len;
517 }
518
X509_NAME_set(X509_NAME ** xn,X509_NAME * name)519 int X509_NAME_set(X509_NAME **xn, X509_NAME *name)
520 {
521 if ((name = X509_NAME_dup(name)) == NULL)
522 return 0;
523 X509_NAME_free(*xn);
524 *xn = name;
525 return 1;
526 }
527
X509_NAME_ENTRY_set(const X509_NAME_ENTRY * ne)528 int X509_NAME_ENTRY_set(const X509_NAME_ENTRY *ne)
529 {
530 return ne->set;
531 }
532
X509_NAME_get0_der(X509_NAME * nm,const unsigned char ** pder,size_t * pderlen)533 int X509_NAME_get0_der(X509_NAME *nm, const unsigned char **pder,
534 size_t *pderlen)
535 {
536 /* Make sure encoding is valid */
537 if (i2d_X509_NAME(nm, NULL) <= 0)
538 return 0;
539 if (pder != NULL)
540 *pder = (unsigned char *)nm->bytes->data;
541 if (pderlen != NULL)
542 *pderlen = nm->bytes->length;
543 return 1;
544 }
545