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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