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      1 /* crypto/asn1/x_name.c */
      2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      3  * All rights reserved.
      4  *
      5  * This package is an SSL implementation written
      6  * by Eric Young (eay (at) cryptsoft.com).
      7  * The implementation was written so as to conform with Netscapes SSL.
      8  *
      9  * This library is free for commercial and non-commercial use as long as
     10  * the following conditions are aheared to.  The following conditions
     11  * apply to all code found in this distribution, be it the RC4, RSA,
     12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
     13  * included with this distribution is covered by the same copyright terms
     14  * except that the holder is Tim Hudson (tjh (at) cryptsoft.com).
     15  *
     16  * Copyright remains Eric Young's, and as such any Copyright notices in
     17  * the code are not to be removed.
     18  * If this package is used in a product, Eric Young should be given attribution
     19  * as the author of the parts of the library used.
     20  * This can be in the form of a textual message at program startup or
     21  * in documentation (online or textual) provided with the package.
     22  *
     23  * Redistribution and use in source and binary forms, with or without
     24  * modification, are permitted provided that the following conditions
     25  * are met:
     26  * 1. Redistributions of source code must retain the copyright
     27  *    notice, this list of conditions and the following disclaimer.
     28  * 2. Redistributions in binary form must reproduce the above copyright
     29  *    notice, this list of conditions and the following disclaimer in the
     30  *    documentation and/or other materials provided with the distribution.
     31  * 3. All advertising materials mentioning features or use of this software
     32  *    must display the following acknowledgement:
     33  *    "This product includes cryptographic software written by
     34  *     Eric Young (eay (at) cryptsoft.com)"
     35  *    The word 'cryptographic' can be left out if the rouines from the library
     36  *    being used are not cryptographic related :-).
     37  * 4. If you include any Windows specific code (or a derivative thereof) from
     38  *    the apps directory (application code) you must include an acknowledgement:
     39  *    "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)"
     40  *
     41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
     42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     51  * SUCH DAMAGE.
     52  *
     53  * The licence and distribution terms for any publically available version or
     54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
     55  * copied and put under another distribution licence
     56  * [including the GNU Public Licence.]
     57  */
     58 
     59 #include <stdio.h>
     60 #include <ctype.h>
     61 #include "cryptlib.h"
     62 #include <openssl/asn1t.h>
     63 #include <openssl/x509.h>
     64 #include "asn1_locl.h"
     65 
     66 typedef STACK_OF(X509_NAME_ENTRY) STACK_OF_X509_NAME_ENTRY;
     67 DECLARE_STACK_OF(STACK_OF_X509_NAME_ENTRY)
     68 
     69 static int x509_name_ex_d2i(ASN1_VALUE **val,
     70 				const unsigned char **in, long len,
     71 				const ASN1_ITEM *it,
     72 				int tag, int aclass, char opt, ASN1_TLC *ctx);
     73 
     74 static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out,
     75 				const ASN1_ITEM *it, int tag, int aclass);
     76 static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it);
     77 static void x509_name_ex_free(ASN1_VALUE **val, const ASN1_ITEM *it);
     78 
     79 static int x509_name_encode(X509_NAME *a);
     80 static int x509_name_canon(X509_NAME *a);
     81 static int asn1_string_canon(ASN1_STRING *out, ASN1_STRING *in);
     82 static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname,
     83 			  unsigned char **in);
     84 
     85 
     86 static int x509_name_ex_print(BIO *out, ASN1_VALUE **pval,
     87 						int indent,
     88 						const char *fname,
     89 						const ASN1_PCTX *pctx);
     90 
     91 ASN1_SEQUENCE(X509_NAME_ENTRY) = {
     92 	ASN1_SIMPLE(X509_NAME_ENTRY, object, ASN1_OBJECT),
     93 	ASN1_SIMPLE(X509_NAME_ENTRY, value, ASN1_PRINTABLE)
     94 } ASN1_SEQUENCE_END(X509_NAME_ENTRY)
     95 
     96 IMPLEMENT_ASN1_FUNCTIONS(X509_NAME_ENTRY)
     97 IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME_ENTRY)
     98 
     99 /* For the "Name" type we need a SEQUENCE OF { SET OF X509_NAME_ENTRY }
    100  * so declare two template wrappers for this
    101  */
    102 
    103 ASN1_ITEM_TEMPLATE(X509_NAME_ENTRIES) =
    104 	ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SET_OF, 0, RDNS, X509_NAME_ENTRY)
    105 ASN1_ITEM_TEMPLATE_END(X509_NAME_ENTRIES)
    106 
    107 ASN1_ITEM_TEMPLATE(X509_NAME_INTERNAL) =
    108 	ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, Name, X509_NAME_ENTRIES)
    109 ASN1_ITEM_TEMPLATE_END(X509_NAME_INTERNAL)
    110 
    111 /* Normally that's where it would end: we'd have two nested STACK structures
    112  * representing the ASN1. Unfortunately X509_NAME uses a completely different
    113  * form and caches encodings so we have to process the internal form and convert
    114  * to the external form.
    115  */
    116 
    117 const ASN1_EXTERN_FUNCS x509_name_ff = {
    118 	NULL,
    119 	x509_name_ex_new,
    120 	x509_name_ex_free,
    121 	0,	/* Default clear behaviour is OK */
    122 	x509_name_ex_d2i,
    123 	x509_name_ex_i2d,
    124 	x509_name_ex_print
    125 };
    126 
    127 IMPLEMENT_EXTERN_ASN1(X509_NAME, V_ASN1_SEQUENCE, x509_name_ff)
    128 
    129 IMPLEMENT_ASN1_FUNCTIONS(X509_NAME)
    130 IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME)
    131 
    132 static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it)
    133 {
    134 	X509_NAME *ret = NULL;
    135 	ret = OPENSSL_malloc(sizeof(X509_NAME));
    136 	if(!ret) goto memerr;
    137 	if ((ret->entries=sk_X509_NAME_ENTRY_new_null()) == NULL)
    138 		goto memerr;
    139 	if((ret->bytes = BUF_MEM_new()) == NULL) goto memerr;
    140 	ret->canon_enc = NULL;
    141 	ret->canon_enclen = 0;
    142 	ret->modified=1;
    143 	*val = (ASN1_VALUE *)ret;
    144 	return 1;
    145 
    146  memerr:
    147 	ASN1err(ASN1_F_X509_NAME_EX_NEW, ERR_R_MALLOC_FAILURE);
    148 	if (ret)
    149 		{
    150 		if (ret->entries)
    151 			sk_X509_NAME_ENTRY_free(ret->entries);
    152 		OPENSSL_free(ret);
    153 		}
    154 	return 0;
    155 }
    156 
    157 static void x509_name_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
    158 {
    159 	X509_NAME *a;
    160 	if(!pval || !*pval)
    161 	    return;
    162 	a = (X509_NAME *)*pval;
    163 
    164 	BUF_MEM_free(a->bytes);
    165 	sk_X509_NAME_ENTRY_pop_free(a->entries,X509_NAME_ENTRY_free);
    166 	if (a->canon_enc)
    167 		OPENSSL_free(a->canon_enc);
    168 	OPENSSL_free(a);
    169 	*pval = NULL;
    170 }
    171 
    172 static int x509_name_ex_d2i(ASN1_VALUE **val,
    173 			const unsigned char **in, long len, const ASN1_ITEM *it,
    174 				int tag, int aclass, char opt, ASN1_TLC *ctx)
    175 {
    176 	const unsigned char *p = *in, *q;
    177 	union { STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
    178 		ASN1_VALUE *a; } intname = {NULL};
    179 	union { X509_NAME *x; ASN1_VALUE *a; } nm = {NULL};
    180 	int i, j, ret;
    181 	STACK_OF(X509_NAME_ENTRY) *entries;
    182 	X509_NAME_ENTRY *entry;
    183 	q = p;
    184 
    185 	/* Get internal representation of Name */
    186 	ret = ASN1_item_ex_d2i(&intname.a,
    187 			       &p, len, ASN1_ITEM_rptr(X509_NAME_INTERNAL),
    188 			       tag, aclass, opt, ctx);
    189 
    190 	if(ret <= 0) return ret;
    191 
    192 	if(*val) x509_name_ex_free(val, NULL);
    193 	if(!x509_name_ex_new(&nm.a, NULL)) goto err;
    194 	/* We've decoded it: now cache encoding */
    195 	if(!BUF_MEM_grow(nm.x->bytes, p - q)) goto err;
    196 	memcpy(nm.x->bytes->data, q, p - q);
    197 
    198 	/* Convert internal representation to X509_NAME structure */
    199 	for(i = 0; i < sk_STACK_OF_X509_NAME_ENTRY_num(intname.s); i++) {
    200 		entries = sk_STACK_OF_X509_NAME_ENTRY_value(intname.s, i);
    201 		for(j = 0; j < sk_X509_NAME_ENTRY_num(entries); j++) {
    202 			entry = sk_X509_NAME_ENTRY_value(entries, j);
    203 			entry->set = i;
    204 			if(!sk_X509_NAME_ENTRY_push(nm.x->entries, entry))
    205 				goto err;
    206 		}
    207 		sk_X509_NAME_ENTRY_free(entries);
    208 	}
    209 	sk_STACK_OF_X509_NAME_ENTRY_free(intname.s);
    210 	ret = x509_name_canon(nm.x);
    211 	if (!ret)
    212 		goto err;
    213 	nm.x->modified = 0;
    214 	*val = nm.a;
    215 	*in = p;
    216 	return ret;
    217 	err:
    218 	ASN1err(ASN1_F_X509_NAME_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
    219 	return 0;
    220 }
    221 
    222 static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out, const ASN1_ITEM *it, int tag, int aclass)
    223 {
    224 	int ret;
    225 	X509_NAME *a = (X509_NAME *)*val;
    226 	if(a->modified) {
    227 		ret = x509_name_encode(a);
    228 		if(ret < 0)
    229 			return ret;
    230 		ret = x509_name_canon(a);
    231 		if(ret < 0)
    232 			return ret;
    233 	}
    234 	ret = a->bytes->length;
    235 	if(out != NULL) {
    236 		memcpy(*out,a->bytes->data,ret);
    237 		*out+=ret;
    238 	}
    239 	return ret;
    240 }
    241 
    242 static void local_sk_X509_NAME_ENTRY_free(STACK_OF(X509_NAME_ENTRY) *ne)
    243 	{
    244 	sk_X509_NAME_ENTRY_free(ne);
    245 	}
    246 
    247 static void local_sk_X509_NAME_ENTRY_pop_free(STACK_OF(X509_NAME_ENTRY) *ne)
    248 	{
    249 	sk_X509_NAME_ENTRY_pop_free(ne, X509_NAME_ENTRY_free);
    250 	}
    251 
    252 static int x509_name_encode(X509_NAME *a)
    253 {
    254 	union { STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
    255 		ASN1_VALUE *a; } intname = {NULL};
    256 	int len;
    257 	unsigned char *p;
    258 	STACK_OF(X509_NAME_ENTRY) *entries = NULL;
    259 	X509_NAME_ENTRY *entry;
    260 	int i, set = -1;
    261 	intname.s = sk_STACK_OF_X509_NAME_ENTRY_new_null();
    262 	if(!intname.s) goto memerr;
    263 	for(i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
    264 		entry = sk_X509_NAME_ENTRY_value(a->entries, i);
    265 		if(entry->set != set) {
    266 			entries = sk_X509_NAME_ENTRY_new_null();
    267 			if(!entries) goto memerr;
    268 			if(!sk_STACK_OF_X509_NAME_ENTRY_push(intname.s,
    269 							     entries))
    270 				goto memerr;
    271 			set = entry->set;
    272 		}
    273 		if(!sk_X509_NAME_ENTRY_push(entries, entry)) goto memerr;
    274 	}
    275 	len = ASN1_item_ex_i2d(&intname.a, NULL,
    276 			       ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
    277 	if (!BUF_MEM_grow(a->bytes,len)) goto memerr;
    278 	p=(unsigned char *)a->bytes->data;
    279 	ASN1_item_ex_i2d(&intname.a,
    280 			 &p, ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
    281 	sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
    282 					     local_sk_X509_NAME_ENTRY_free);
    283 	a->modified = 0;
    284 	return len;
    285 memerr:
    286 	sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
    287 					     local_sk_X509_NAME_ENTRY_free);
    288 	ASN1err(ASN1_F_X509_NAME_ENCODE, ERR_R_MALLOC_FAILURE);
    289 	return -1;
    290 }
    291 
    292 static int x509_name_ex_print(BIO *out, ASN1_VALUE **pval,
    293 						int indent,
    294 						const char *fname,
    295 						const ASN1_PCTX *pctx)
    296 	{
    297 	if (X509_NAME_print_ex(out, (X509_NAME *)*pval,
    298 					indent, pctx->nm_flags) <= 0)
    299 		return 0;
    300 	return 2;
    301 	}
    302 
    303 /* This function generates the canonical encoding of the Name structure.
    304  * In it all strings are converted to UTF8, leading, trailing and
    305  * multiple spaces collapsed, converted to lower case and the leading
    306  * SEQUENCE header removed.
    307  *
    308  * In future we could also normalize the UTF8 too.
    309  *
    310  * By doing this comparison of Name structures can be rapidly
    311  * perfomed by just using memcmp() of the canonical encoding.
    312  * By omitting the leading SEQUENCE name constraints of type
    313  * dirName can also be checked with a simple memcmp().
    314  */
    315 
    316 static int x509_name_canon(X509_NAME *a)
    317 	{
    318 	unsigned char *p;
    319 	STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname = NULL;
    320 	STACK_OF(X509_NAME_ENTRY) *entries = NULL;
    321 	X509_NAME_ENTRY *entry, *tmpentry = NULL;
    322 	int i, set = -1, ret = 0;
    323 
    324 	if (a->canon_enc)
    325 		{
    326 		OPENSSL_free(a->canon_enc);
    327 		a->canon_enc = NULL;
    328 		}
    329 	/* Special case: empty X509_NAME => null encoding */
    330 	if (sk_X509_NAME_ENTRY_num(a->entries) == 0)
    331 		{
    332 		a->canon_enclen = 0;
    333 		return 1;
    334 		}
    335 	intname = sk_STACK_OF_X509_NAME_ENTRY_new_null();
    336 	if(!intname)
    337 		goto err;
    338 	for(i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++)
    339 		{
    340 		entry = sk_X509_NAME_ENTRY_value(a->entries, i);
    341 		if(entry->set != set)
    342 			{
    343 			entries = sk_X509_NAME_ENTRY_new_null();
    344 			if(!entries)
    345 				goto err;
    346 			if(!sk_STACK_OF_X509_NAME_ENTRY_push(intname, entries))
    347 				goto err;
    348 			set = entry->set;
    349 			}
    350 		tmpentry = X509_NAME_ENTRY_new();
    351 		tmpentry->object = OBJ_dup(entry->object);
    352 		if (!asn1_string_canon(tmpentry->value, entry->value))
    353 			goto err;
    354 		if(!sk_X509_NAME_ENTRY_push(entries, tmpentry))
    355 			goto err;
    356 		tmpentry = NULL;
    357 		}
    358 
    359 	/* Finally generate encoding */
    360 
    361 	a->canon_enclen = i2d_name_canon(intname, NULL);
    362 
    363 	p = OPENSSL_malloc(a->canon_enclen);
    364 
    365 	if (!p)
    366 		goto err;
    367 
    368 	a->canon_enc = p;
    369 
    370 	i2d_name_canon(intname, &p);
    371 
    372 	ret = 1;
    373 
    374 	err:
    375 
    376 	if (tmpentry)
    377 		X509_NAME_ENTRY_free(tmpentry);
    378 	if (intname)
    379 		sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
    380 					local_sk_X509_NAME_ENTRY_pop_free);
    381 	return ret;
    382 	}
    383 
    384 /* Bitmap of all the types of string that will be canonicalized. */
    385 
    386 #define ASN1_MASK_CANON	\
    387 	(B_ASN1_UTF8STRING | B_ASN1_BMPSTRING | B_ASN1_UNIVERSALSTRING \
    388 	| B_ASN1_PRINTABLESTRING | B_ASN1_T61STRING | B_ASN1_IA5STRING \
    389 	| B_ASN1_VISIBLESTRING)
    390 
    391 
    392 static int asn1_string_canon(ASN1_STRING *out, ASN1_STRING *in)
    393 	{
    394 	unsigned char *to, *from;
    395 	int len, i;
    396 
    397 	/* If type not in bitmask just copy string across */
    398 	if (!(ASN1_tag2bit(in->type) & ASN1_MASK_CANON))
    399 		{
    400 		out->type = in->type;
    401 		if (!ASN1_STRING_set(out, in->data, in->length))
    402 			return 0;
    403 		return 1;
    404 		}
    405 
    406 	out->type = V_ASN1_UTF8STRING;
    407 	out->length = ASN1_STRING_to_UTF8(&out->data, in);
    408 	if (out->length == -1)
    409 		return 0;
    410 
    411 	to = out->data;
    412 	from = to;
    413 
    414 	len = out->length;
    415 
    416 	/* Convert string in place to canonical form.
    417 	 * Ultimately we may need to handle a wider range of characters
    418 	 * but for now ignore anything with MSB set and rely on the
    419 	 * isspace() and tolower() functions.
    420 	 */
    421 
    422 	/* Ignore leading spaces */
    423 	while((len > 0) && !(*from & 0x80) && isspace(*from))
    424 		{
    425 		from++;
    426 		len--;
    427 		}
    428 
    429 	to = from + len - 1;
    430 
    431 	/* Ignore trailing spaces */
    432 	while ((len > 0) && !(*to & 0x80) && isspace(*to))
    433 		{
    434 		to--;
    435 		len--;
    436 		}
    437 
    438 	to = out->data;
    439 
    440 	i = 0;
    441 	while(i < len)
    442 		{
    443 		/* If MSB set just copy across */
    444 		if (*from & 0x80)
    445 			{
    446 			*to++ = *from++;
    447 			i++;
    448 			}
    449 		/* Collapse multiple spaces */
    450 		else if (isspace(*from))
    451 			{
    452 			/* Copy one space across */
    453 			*to++ = ' ';
    454 			/* Ignore subsequent spaces. Note: don't need to
    455 			 * check len here because we know the last
    456 			 * character is a non-space so we can't overflow.
    457 			 */
    458 			do
    459 				{
    460 				from++;
    461 				i++;
    462 				}
    463 			while(!(*from & 0x80) && isspace(*from));
    464 			}
    465 		else
    466 			{
    467 			*to++ = tolower(*from++);
    468 			i++;
    469 			}
    470 		}
    471 
    472 	out->length = to - out->data;
    473 
    474 	return 1;
    475 
    476 	}
    477 
    478 static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) *_intname,
    479 			  unsigned char **in)
    480 	{
    481 	int i, len, ltmp;
    482 	ASN1_VALUE *v;
    483 	STACK_OF(ASN1_VALUE) *intname = (STACK_OF(ASN1_VALUE) *)_intname;
    484 
    485 	len = 0;
    486 	for (i = 0; i < sk_ASN1_VALUE_num(intname); i++)
    487 		{
    488 		v = sk_ASN1_VALUE_value(intname, i);
    489 		ltmp = ASN1_item_ex_i2d(&v, in,
    490 			ASN1_ITEM_rptr(X509_NAME_ENTRIES), -1, -1);
    491 		if (ltmp < 0)
    492 			return ltmp;
    493 		len += ltmp;
    494 		}
    495 	return len;
    496 	}
    497 
    498 int X509_NAME_set(X509_NAME **xn, X509_NAME *name)
    499 	{
    500 	X509_NAME *in;
    501 
    502 	if (!xn || !name) return(0);
    503 
    504 	if (*xn != name)
    505 		{
    506 		in=X509_NAME_dup(name);
    507 		if (in != NULL)
    508 			{
    509 			X509_NAME_free(*xn);
    510 			*xn=in;
    511 			}
    512 		}
    513 	return(*xn != NULL);
    514 	}
    515 
    516 IMPLEMENT_STACK_OF(X509_NAME_ENTRY)
    517 IMPLEMENT_ASN1_SET_OF(X509_NAME_ENTRY)
    518