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/asn1_locl.h"
70 #include "../internal.h"
71
72
73 typedef STACK_OF(X509_NAME_ENTRY) STACK_OF_X509_NAME_ENTRY;
74 DEFINE_STACK_OF(STACK_OF_X509_NAME_ENTRY)
75
76 /*
77 * Maximum length of X509_NAME: much larger than anything we should
78 * ever see in practice.
79 */
80
81 #define X509_NAME_MAX (1024 * 1024)
82
83 static int x509_name_ex_d2i(ASN1_VALUE **val,
84 const unsigned char **in, long len,
85 const ASN1_ITEM *it,
86 int tag, int aclass, char opt, ASN1_TLC *ctx);
87
88 static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out,
89 const ASN1_ITEM *it, int tag, int aclass);
90 static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it);
91 static void x509_name_ex_free(ASN1_VALUE **val, const ASN1_ITEM *it);
92
93 static int x509_name_encode(X509_NAME *a);
94 static int x509_name_canon(X509_NAME *a);
95 static int asn1_string_canon(ASN1_STRING *out, ASN1_STRING *in);
96 static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) * intname,
97 unsigned char **in);
98
99 ASN1_SEQUENCE(X509_NAME_ENTRY) = {
100 ASN1_SIMPLE(X509_NAME_ENTRY, object, ASN1_OBJECT),
101 ASN1_SIMPLE(X509_NAME_ENTRY, value, ASN1_PRINTABLE)
102 } ASN1_SEQUENCE_END(X509_NAME_ENTRY)
103
104 IMPLEMENT_ASN1_FUNCTIONS(X509_NAME_ENTRY)
105 IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME_ENTRY)
106
107 /*
108 * For the "Name" type we need a SEQUENCE OF { SET OF X509_NAME_ENTRY } so
109 * declare two template wrappers for this
110 */
111
112 ASN1_ITEM_TEMPLATE(X509_NAME_ENTRIES) =
113 ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SET_OF, 0, RDNS, X509_NAME_ENTRY)
114 ASN1_ITEM_TEMPLATE_END(X509_NAME_ENTRIES)
115
116 ASN1_ITEM_TEMPLATE(X509_NAME_INTERNAL) =
117 ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, Name, X509_NAME_ENTRIES)
118 ASN1_ITEM_TEMPLATE_END(X509_NAME_INTERNAL)
119
120 /*
121 * Normally that's where it would end: we'd have two nested STACK structures
122 * representing the ASN1. Unfortunately X509_NAME uses a completely different
123 * form and caches encodings so we have to process the internal form and
124 * convert to the external form.
125 */
126
127 static const ASN1_EXTERN_FUNCS x509_name_ff = {
128 NULL,
129 x509_name_ex_new,
130 x509_name_ex_free,
131 0, /* Default clear behaviour is OK */
132 x509_name_ex_d2i,
133 x509_name_ex_i2d,
134 NULL,
135 };
136
IMPLEMENT_EXTERN_ASN1(X509_NAME,V_ASN1_SEQUENCE,x509_name_ff)137 IMPLEMENT_EXTERN_ASN1(X509_NAME, V_ASN1_SEQUENCE, x509_name_ff)
138
139 IMPLEMENT_ASN1_FUNCTIONS(X509_NAME)
140
141 IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME)
142
143 static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it)
144 {
145 X509_NAME *ret = NULL;
146 ret = OPENSSL_malloc(sizeof(X509_NAME));
147 if (!ret)
148 goto memerr;
149 if ((ret->entries = sk_X509_NAME_ENTRY_new_null()) == NULL)
150 goto memerr;
151 if ((ret->bytes = BUF_MEM_new()) == NULL)
152 goto memerr;
153 ret->canon_enc = NULL;
154 ret->canon_enclen = 0;
155 ret->modified = 1;
156 *val = (ASN1_VALUE *)ret;
157 return 1;
158
159 memerr:
160 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
161 if (ret) {
162 if (ret->entries)
163 sk_X509_NAME_ENTRY_free(ret->entries);
164 OPENSSL_free(ret);
165 }
166 return 0;
167 }
168
x509_name_ex_free(ASN1_VALUE ** pval,const ASN1_ITEM * it)169 static void x509_name_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
170 {
171 X509_NAME *a;
172 if (!pval || !*pval)
173 return;
174 a = (X509_NAME *)*pval;
175
176 BUF_MEM_free(a->bytes);
177 sk_X509_NAME_ENTRY_pop_free(a->entries, X509_NAME_ENTRY_free);
178 if (a->canon_enc)
179 OPENSSL_free(a->canon_enc);
180 OPENSSL_free(a);
181 *pval = NULL;
182 }
183
local_sk_X509_NAME_ENTRY_free(STACK_OF (X509_NAME_ENTRY)* ne)184 static void local_sk_X509_NAME_ENTRY_free(STACK_OF(X509_NAME_ENTRY) *ne)
185 {
186 sk_X509_NAME_ENTRY_free(ne);
187 }
188
local_sk_X509_NAME_ENTRY_pop_free(STACK_OF (X509_NAME_ENTRY)* ne)189 static void local_sk_X509_NAME_ENTRY_pop_free(STACK_OF(X509_NAME_ENTRY) *ne)
190 {
191 sk_X509_NAME_ENTRY_pop_free(ne, X509_NAME_ENTRY_free);
192 }
193
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)194 static int x509_name_ex_d2i(ASN1_VALUE **val,
195 const unsigned char **in, long len,
196 const ASN1_ITEM *it, int tag, int aclass,
197 char opt, ASN1_TLC *ctx)
198 {
199 const unsigned char *p = *in, *q;
200 union {
201 STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
202 ASN1_VALUE *a;
203 } intname = {
204 NULL
205 };
206 union {
207 X509_NAME *x;
208 ASN1_VALUE *a;
209 } nm = {
210 NULL
211 };
212 size_t i, j;
213 int ret;
214 STACK_OF(X509_NAME_ENTRY) *entries;
215 X509_NAME_ENTRY *entry;
216 /* Bound the size of an X509_NAME we are willing to parse. */
217 if (len > X509_NAME_MAX) {
218 len = X509_NAME_MAX;
219 }
220 q = p;
221
222 /* Get internal representation of Name */
223 ret = ASN1_item_ex_d2i(&intname.a,
224 &p, len, ASN1_ITEM_rptr(X509_NAME_INTERNAL),
225 tag, aclass, opt, ctx);
226
227 if (ret <= 0)
228 return ret;
229
230 if (*val)
231 x509_name_ex_free(val, NULL);
232 if (!x509_name_ex_new(&nm.a, NULL))
233 goto err;
234 /* We've decoded it: now cache encoding */
235 if (!BUF_MEM_grow(nm.x->bytes, p - q))
236 goto err;
237 OPENSSL_memcpy(nm.x->bytes->data, q, p - q);
238
239 /* Convert internal representation to X509_NAME structure */
240 for (i = 0; i < sk_STACK_OF_X509_NAME_ENTRY_num(intname.s); i++) {
241 entries = sk_STACK_OF_X509_NAME_ENTRY_value(intname.s, i);
242 for (j = 0; j < sk_X509_NAME_ENTRY_num(entries); j++) {
243 entry = sk_X509_NAME_ENTRY_value(entries, j);
244 entry->set = i;
245 if (!sk_X509_NAME_ENTRY_push(nm.x->entries, entry))
246 goto err;
247 sk_X509_NAME_ENTRY_set(entries, j, NULL);
248 }
249 }
250 ret = x509_name_canon(nm.x);
251 if (!ret)
252 goto err;
253 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
254 local_sk_X509_NAME_ENTRY_free);
255 nm.x->modified = 0;
256 *val = nm.a;
257 *in = p;
258 return ret;
259 err:
260 if (nm.x != NULL)
261 X509_NAME_free(nm.x);
262 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
263 local_sk_X509_NAME_ENTRY_pop_free);
264 OPENSSL_PUT_ERROR(X509, ERR_R_ASN1_LIB);
265 return 0;
266 }
267
x509_name_ex_i2d(ASN1_VALUE ** val,unsigned char ** out,const ASN1_ITEM * it,int tag,int aclass)268 static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out,
269 const ASN1_ITEM *it, int tag, int aclass)
270 {
271 int ret;
272 X509_NAME *a = (X509_NAME *)*val;
273 if (a->modified) {
274 ret = x509_name_encode(a);
275 if (ret < 0)
276 return ret;
277 ret = x509_name_canon(a);
278 if (ret < 0)
279 return ret;
280 }
281 ret = a->bytes->length;
282 if (out != NULL) {
283 OPENSSL_memcpy(*out, a->bytes->data, ret);
284 *out += ret;
285 }
286 return ret;
287 }
288
x509_name_encode(X509_NAME * a)289 static int x509_name_encode(X509_NAME *a)
290 {
291 union {
292 STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
293 ASN1_VALUE *a;
294 } intname = {
295 NULL
296 };
297 int len;
298 unsigned char *p;
299 STACK_OF(X509_NAME_ENTRY) *entries = NULL;
300 X509_NAME_ENTRY *entry;
301 int set = -1;
302 size_t i;
303 intname.s = sk_STACK_OF_X509_NAME_ENTRY_new_null();
304 if (!intname.s)
305 goto memerr;
306 for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
307 entry = sk_X509_NAME_ENTRY_value(a->entries, i);
308 if (entry->set != set) {
309 entries = sk_X509_NAME_ENTRY_new_null();
310 if (!entries)
311 goto memerr;
312 if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname.s, entries)) {
313 sk_X509_NAME_ENTRY_free(entries);
314 goto memerr;
315 }
316 set = entry->set;
317 }
318 if (!sk_X509_NAME_ENTRY_push(entries, entry))
319 goto memerr;
320 }
321 len = ASN1_item_ex_i2d(&intname.a, NULL,
322 ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
323 if (!BUF_MEM_grow(a->bytes, len))
324 goto memerr;
325 p = (unsigned char *)a->bytes->data;
326 ASN1_item_ex_i2d(&intname.a,
327 &p, ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
328 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
329 local_sk_X509_NAME_ENTRY_free);
330 a->modified = 0;
331 return len;
332 memerr:
333 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
334 local_sk_X509_NAME_ENTRY_free);
335 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
336 return -1;
337 }
338
339 /*
340 * This function generates the canonical encoding of the Name structure. In
341 * it all strings are converted to UTF8, leading, trailing and multiple
342 * spaces collapsed, converted to lower case and the leading SEQUENCE header
343 * removed. In future we could also normalize the UTF8 too. By doing this
344 * comparison of Name structures can be rapidly perfomed by just using
345 * OPENSSL_memcmp() of the canonical encoding. By omitting the leading SEQUENCE name
346 * constraints of type dirName can also be checked with a simple OPENSSL_memcmp().
347 */
348
x509_name_canon(X509_NAME * a)349 static int x509_name_canon(X509_NAME *a)
350 {
351 unsigned char *p;
352 STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname = NULL;
353 STACK_OF(X509_NAME_ENTRY) *entries = NULL;
354 X509_NAME_ENTRY *entry, *tmpentry = NULL;
355 int set = -1, ret = 0, len;
356 size_t i;
357
358 if (a->canon_enc) {
359 OPENSSL_free(a->canon_enc);
360 a->canon_enc = NULL;
361 }
362 /* Special case: empty X509_NAME => null encoding */
363 if (sk_X509_NAME_ENTRY_num(a->entries) == 0) {
364 a->canon_enclen = 0;
365 return 1;
366 }
367 intname = sk_STACK_OF_X509_NAME_ENTRY_new_null();
368 if (!intname)
369 goto err;
370 for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
371 entry = sk_X509_NAME_ENTRY_value(a->entries, i);
372 if (entry->set != set) {
373 entries = sk_X509_NAME_ENTRY_new_null();
374 if (!entries)
375 goto err;
376 if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname, entries)) {
377 sk_X509_NAME_ENTRY_free(entries);
378 goto err;
379 }
380 set = entry->set;
381 }
382 tmpentry = X509_NAME_ENTRY_new();
383 if (tmpentry == NULL)
384 goto err;
385 tmpentry->object = OBJ_dup(entry->object);
386 if (!asn1_string_canon(tmpentry->value, entry->value))
387 goto err;
388 if (!sk_X509_NAME_ENTRY_push(entries, tmpentry))
389 goto err;
390 tmpentry = NULL;
391 }
392
393 /* Finally generate encoding */
394
395 len = i2d_name_canon(intname, NULL);
396 if (len < 0) {
397 goto err;
398 }
399 a->canon_enclen = len;
400
401 p = OPENSSL_malloc(a->canon_enclen);
402
403 if (!p)
404 goto err;
405
406 a->canon_enc = p;
407
408 i2d_name_canon(intname, &p);
409
410 ret = 1;
411
412 err:
413
414 if (tmpentry)
415 X509_NAME_ENTRY_free(tmpentry);
416 if (intname)
417 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
418 local_sk_X509_NAME_ENTRY_pop_free);
419 return ret;
420 }
421
422 /* Bitmap of all the types of string that will be canonicalized. */
423
424 #define ASN1_MASK_CANON \
425 (B_ASN1_UTF8STRING | B_ASN1_BMPSTRING | B_ASN1_UNIVERSALSTRING \
426 | B_ASN1_PRINTABLESTRING | B_ASN1_T61STRING | B_ASN1_IA5STRING \
427 | B_ASN1_VISIBLESTRING)
428
asn1_string_canon(ASN1_STRING * out,ASN1_STRING * in)429 static int asn1_string_canon(ASN1_STRING *out, ASN1_STRING *in)
430 {
431 unsigned char *to, *from;
432 int len, i;
433
434 /* If type not in bitmask just copy string across */
435 if (!(ASN1_tag2bit(in->type) & ASN1_MASK_CANON)) {
436 if (!ASN1_STRING_copy(out, in))
437 return 0;
438 return 1;
439 }
440
441 out->type = V_ASN1_UTF8STRING;
442 out->length = ASN1_STRING_to_UTF8(&out->data, in);
443 if (out->length == -1)
444 return 0;
445
446 to = out->data;
447 from = to;
448
449 len = out->length;
450
451 /*
452 * Convert string in place to canonical form. Ultimately we may need to
453 * handle a wider range of characters but for now ignore anything with
454 * MSB set and rely on the isspace() and tolower() functions.
455 */
456
457 /* Ignore leading spaces */
458 while ((len > 0) && !(*from & 0x80) && isspace(*from)) {
459 from++;
460 len--;
461 }
462
463 to = from + len;
464
465 /* Ignore trailing spaces */
466 while ((len > 0) && !(to[-1] & 0x80) && isspace(to[-1])) {
467 to--;
468 len--;
469 }
470
471 to = out->data;
472
473 i = 0;
474 while (i < len) {
475 /* If MSB set just copy across */
476 if (*from & 0x80) {
477 *to++ = *from++;
478 i++;
479 }
480 /* Collapse multiple spaces */
481 else if (isspace(*from)) {
482 /* Copy one space across */
483 *to++ = ' ';
484 /*
485 * Ignore subsequent spaces. Note: don't need to check len here
486 * because we know the last character is a non-space so we can't
487 * overflow.
488 */
489 do {
490 from++;
491 i++;
492 }
493 while (!(*from & 0x80) && isspace(*from));
494 } else {
495 *to++ = tolower(*from);
496 from++;
497 i++;
498 }
499 }
500
501 out->length = to - out->data;
502
503 return 1;
504
505 }
506
i2d_name_canon(STACK_OF (STACK_OF_X509_NAME_ENTRY)* _intname,unsigned char ** in)507 static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) * _intname,
508 unsigned char **in)
509 {
510 int len, ltmp;
511 size_t i;
512 ASN1_VALUE *v;
513 STACK_OF(ASN1_VALUE) *intname = (STACK_OF(ASN1_VALUE) *)_intname;
514
515 len = 0;
516 for (i = 0; i < sk_ASN1_VALUE_num(intname); i++) {
517 v = sk_ASN1_VALUE_value(intname, i);
518 ltmp = ASN1_item_ex_i2d(&v, in,
519 ASN1_ITEM_rptr(X509_NAME_ENTRIES), -1, -1);
520 if (ltmp < 0)
521 return ltmp;
522 len += ltmp;
523 }
524 return len;
525 }
526
X509_NAME_set(X509_NAME ** xn,X509_NAME * name)527 int X509_NAME_set(X509_NAME **xn, X509_NAME *name)
528 {
529 X509_NAME *in;
530
531 if (!xn || !name)
532 return (0);
533
534 if (*xn != name) {
535 in = X509_NAME_dup(name);
536 if (in != NULL) {
537 X509_NAME_free(*xn);
538 *xn = in;
539 }
540 }
541 return (*xn != NULL);
542 }
543
544 IMPLEMENT_ASN1_SET_OF(X509_NAME_ENTRY)
545