xref: /openbsd/lib/libcrypto/x509/x509_att.c (revision 3cab2bb3) 
1 /* $OpenBSD: x509_att.c,v 1.17 2018/05/18 19:21:33 tb Exp $ */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@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@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@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@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 
61 #include <openssl/asn1.h>
62 #include <openssl/err.h>
63 #include <openssl/evp.h>
64 #include <openssl/objects.h>
65 #include <openssl/stack.h>
66 #include <openssl/x509.h>
67 #include <openssl/x509v3.h>
68 
69 int
70 X509at_get_attr_count(const STACK_OF(X509_ATTRIBUTE) *x)
71 {
72 	return sk_X509_ATTRIBUTE_num(x);
73 }
74 
75 int
76 X509at_get_attr_by_NID(const STACK_OF(X509_ATTRIBUTE) *x, int nid, int lastpos)
77 {
78 	ASN1_OBJECT *obj;
79 
80 	obj = OBJ_nid2obj(nid);
81 	if (obj == NULL)
82 		return (-2);
83 	return (X509at_get_attr_by_OBJ(x, obj, lastpos));
84 }
85 
86 int
87 X509at_get_attr_by_OBJ(const STACK_OF(X509_ATTRIBUTE) *sk,
88     const ASN1_OBJECT *obj, int lastpos)
89 {
90 	int n;
91 	X509_ATTRIBUTE *ex;
92 
93 	if (sk == NULL)
94 		return (-1);
95 	lastpos++;
96 	if (lastpos < 0)
97 		lastpos = 0;
98 	n = sk_X509_ATTRIBUTE_num(sk);
99 	for (; lastpos < n; lastpos++) {
100 		ex = sk_X509_ATTRIBUTE_value(sk, lastpos);
101 		if (OBJ_cmp(ex->object, obj) == 0)
102 			return (lastpos);
103 	}
104 	return (-1);
105 }
106 
107 X509_ATTRIBUTE *
108 X509at_get_attr(const STACK_OF(X509_ATTRIBUTE) *x, int loc)
109 {
110 	if (x == NULL || sk_X509_ATTRIBUTE_num(x) <= loc || loc < 0)
111 		return NULL;
112 	else
113 		return sk_X509_ATTRIBUTE_value(x, loc);
114 }
115 
116 X509_ATTRIBUTE *
117 X509at_delete_attr(STACK_OF(X509_ATTRIBUTE) *x, int loc)
118 {
119 	X509_ATTRIBUTE *ret;
120 
121 	if (x == NULL || sk_X509_ATTRIBUTE_num(x) <= loc || loc < 0)
122 		return (NULL);
123 	ret = sk_X509_ATTRIBUTE_delete(x, loc);
124 	return (ret);
125 }
126 
127 STACK_OF(X509_ATTRIBUTE) *
128 X509at_add1_attr(STACK_OF(X509_ATTRIBUTE) **x, X509_ATTRIBUTE *attr)
129 {
130 	X509_ATTRIBUTE *new_attr = NULL;
131 	STACK_OF(X509_ATTRIBUTE) *sk = NULL;
132 
133 	if (x == NULL) {
134 		X509error(ERR_R_PASSED_NULL_PARAMETER);
135 		return (NULL);
136 	}
137 
138 	if (*x == NULL) {
139 		if ((sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
140 			goto err;
141 	} else
142 		sk = *x;
143 
144 	if ((new_attr = X509_ATTRIBUTE_dup(attr)) == NULL)
145 		goto err2;
146 	if (!sk_X509_ATTRIBUTE_push(sk, new_attr))
147 		goto err;
148 	if (*x == NULL)
149 		*x = sk;
150 	return (sk);
151 
152 err:
153 	X509error(ERR_R_MALLOC_FAILURE);
154 err2:
155 	if (new_attr != NULL)
156 		X509_ATTRIBUTE_free(new_attr);
157 	if (sk != NULL && sk != *x)
158 		sk_X509_ATTRIBUTE_free(sk);
159 	return (NULL);
160 }
161 
162 STACK_OF(X509_ATTRIBUTE) *
163 X509at_add1_attr_by_OBJ(STACK_OF(X509_ATTRIBUTE) **x, const ASN1_OBJECT *obj,
164     int type, const unsigned char *bytes, int len)
165 {
166 	X509_ATTRIBUTE *attr;
167 	STACK_OF(X509_ATTRIBUTE) *ret;
168 
169 	attr = X509_ATTRIBUTE_create_by_OBJ(NULL, obj, type, bytes, len);
170 	if (!attr)
171 		return 0;
172 	ret = X509at_add1_attr(x, attr);
173 	X509_ATTRIBUTE_free(attr);
174 	return ret;
175 }
176 
177 STACK_OF(X509_ATTRIBUTE) *
178 X509at_add1_attr_by_NID(STACK_OF(X509_ATTRIBUTE) **x, int nid, int type,
179     const unsigned char *bytes, int len)
180 {
181 	X509_ATTRIBUTE *attr;
182 	STACK_OF(X509_ATTRIBUTE) *ret;
183 
184 	attr = X509_ATTRIBUTE_create_by_NID(NULL, nid, type, bytes, len);
185 	if (!attr)
186 		return 0;
187 	ret = X509at_add1_attr(x, attr);
188 	X509_ATTRIBUTE_free(attr);
189 	return ret;
190 }
191 
192 STACK_OF(X509_ATTRIBUTE) *
193 X509at_add1_attr_by_txt(STACK_OF(X509_ATTRIBUTE) **x, const char *attrname,
194     int type, const unsigned char *bytes, int len)
195 {
196 	X509_ATTRIBUTE *attr;
197 	STACK_OF(X509_ATTRIBUTE) *ret;
198 
199 	attr = X509_ATTRIBUTE_create_by_txt(NULL, attrname, type, bytes, len);
200 	if (!attr)
201 		return 0;
202 	ret = X509at_add1_attr(x, attr);
203 	X509_ATTRIBUTE_free(attr);
204 	return ret;
205 }
206 
207 void *
208 X509at_get0_data_by_OBJ(STACK_OF(X509_ATTRIBUTE) *x, const ASN1_OBJECT *obj,
209     int lastpos, int type)
210 {
211 	int i;
212 	X509_ATTRIBUTE *at;
213 
214 	i = X509at_get_attr_by_OBJ(x, obj, lastpos);
215 	if (i == -1)
216 		return NULL;
217 	if ((lastpos <= -2) && (X509at_get_attr_by_OBJ(x, obj, i) != -1))
218 		return NULL;
219 	at = X509at_get_attr(x, i);
220 	if (lastpos <= -3 && (X509_ATTRIBUTE_count(at) != 1))
221 		return NULL;
222 	return X509_ATTRIBUTE_get0_data(at, 0, type, NULL);
223 }
224 
225 X509_ATTRIBUTE *
226 X509_ATTRIBUTE_create_by_NID(X509_ATTRIBUTE **attr, int nid, int atrtype,
227     const void *data, int len)
228 {
229 	ASN1_OBJECT *obj;
230 	X509_ATTRIBUTE *ret;
231 
232 	obj = OBJ_nid2obj(nid);
233 	if (obj == NULL) {
234 		X509error(X509_R_UNKNOWN_NID);
235 		return (NULL);
236 	}
237 	ret = X509_ATTRIBUTE_create_by_OBJ(attr, obj, atrtype, data, len);
238 	if (ret == NULL)
239 		ASN1_OBJECT_free(obj);
240 	return (ret);
241 }
242 
243 X509_ATTRIBUTE *
244 X509_ATTRIBUTE_create_by_OBJ(X509_ATTRIBUTE **attr, const ASN1_OBJECT *obj,
245     int atrtype, const void *data, int len)
246 {
247 	X509_ATTRIBUTE *ret;
248 
249 	if ((attr == NULL) || (*attr == NULL)) {
250 		if ((ret = X509_ATTRIBUTE_new()) == NULL) {
251 			X509error(ERR_R_MALLOC_FAILURE);
252 			return (NULL);
253 		}
254 	} else
255 		ret= *attr;
256 
257 	if (!X509_ATTRIBUTE_set1_object(ret, obj))
258 		goto err;
259 	if (!X509_ATTRIBUTE_set1_data(ret, atrtype, data, len))
260 		goto err;
261 
262 	if ((attr != NULL) && (*attr == NULL))
263 		*attr = ret;
264 	return (ret);
265 
266 err:
267 	if ((attr == NULL) || (ret != *attr))
268 		X509_ATTRIBUTE_free(ret);
269 	return (NULL);
270 }
271 
272 X509_ATTRIBUTE *
273 X509_ATTRIBUTE_create_by_txt(X509_ATTRIBUTE **attr, const char *atrname,
274     int type, const unsigned char *bytes, int len)
275 {
276 	ASN1_OBJECT *obj;
277 	X509_ATTRIBUTE *nattr;
278 
279 	obj = OBJ_txt2obj(atrname, 0);
280 	if (obj == NULL) {
281 		X509error(X509_R_INVALID_FIELD_NAME);
282 		ERR_asprintf_error_data("name=%s", atrname);
283 		return (NULL);
284 	}
285 	nattr = X509_ATTRIBUTE_create_by_OBJ(attr, obj, type, bytes, len);
286 	ASN1_OBJECT_free(obj);
287 	return nattr;
288 }
289 
290 int
291 X509_ATTRIBUTE_set1_object(X509_ATTRIBUTE *attr, const ASN1_OBJECT *obj)
292 {
293 	if ((attr == NULL) || (obj == NULL))
294 		return (0);
295 	ASN1_OBJECT_free(attr->object);
296 	attr->object = OBJ_dup(obj);
297 	return attr->object != NULL;
298 }
299 
300 int
301 X509_ATTRIBUTE_set1_data(X509_ATTRIBUTE *attr, int attrtype, const void *data,
302     int len)
303 {
304 	ASN1_TYPE *ttmp = NULL;
305 	ASN1_STRING *stmp = NULL;
306 	int atype = 0;
307 
308 	if (!attr)
309 		return 0;
310 	if (attrtype & MBSTRING_FLAG) {
311 		stmp = ASN1_STRING_set_by_NID(NULL, data, len, attrtype,
312 		    OBJ_obj2nid(attr->object));
313 		if (!stmp) {
314 			X509error(ERR_R_ASN1_LIB);
315 			return 0;
316 		}
317 		atype = stmp->type;
318 	} else if (len != -1){
319 		if (!(stmp = ASN1_STRING_type_new(attrtype)))
320 			goto err;
321 		if (!ASN1_STRING_set(stmp, data, len))
322 			goto err;
323 		atype = attrtype;
324 	}
325 	if (!(attr->value.set = sk_ASN1_TYPE_new_null()))
326 		goto err;
327 	attr->single = 0;
328 	/* This is a bit naughty because the attribute should really have
329 	 * at least one value but some types use and zero length SET and
330 	 * require this.
331 	 */
332 	if (attrtype == 0) {
333 		ASN1_STRING_free(stmp);
334 		return 1;
335 	}
336 
337 	if (!(ttmp = ASN1_TYPE_new()))
338 		goto err;
339 	if ((len == -1) && !(attrtype & MBSTRING_FLAG)) {
340 		if (!ASN1_TYPE_set1(ttmp, attrtype, data))
341 			goto err;
342 	} else
343 		ASN1_TYPE_set(ttmp, atype, stmp);
344 	if (!sk_ASN1_TYPE_push(attr->value.set, ttmp))
345 		goto err;
346 	return 1;
347 
348 err:
349 	ASN1_TYPE_free(ttmp);
350 	ASN1_STRING_free(stmp);
351 	X509error(ERR_R_MALLOC_FAILURE);
352 	return 0;
353 }
354 
355 int
356 X509_ATTRIBUTE_count(const X509_ATTRIBUTE *attr)
357 {
358 	if (!attr->single)
359 		return sk_ASN1_TYPE_num(attr->value.set);
360 	if (attr->value.single)
361 		return 1;
362 	return 0;
363 }
364 
365 ASN1_OBJECT *
366 X509_ATTRIBUTE_get0_object(X509_ATTRIBUTE *attr)
367 {
368 	if (attr == NULL)
369 		return (NULL);
370 	return (attr->object);
371 }
372 
373 void *
374 X509_ATTRIBUTE_get0_data(X509_ATTRIBUTE *attr, int idx, int atrtype, void *data)
375 {
376 	ASN1_TYPE *ttmp;
377 
378 	ttmp = X509_ATTRIBUTE_get0_type(attr, idx);
379 	if (!ttmp)
380 		return NULL;
381 	if (atrtype != ASN1_TYPE_get(ttmp)){
382 		X509error(X509_R_WRONG_TYPE);
383 		return NULL;
384 	}
385 	return ttmp->value.ptr;
386 }
387 
388 ASN1_TYPE *
389 X509_ATTRIBUTE_get0_type(X509_ATTRIBUTE *attr, int idx)
390 {
391 	if (attr == NULL)
392 		return (NULL);
393 	if (idx >= X509_ATTRIBUTE_count(attr))
394 		return NULL;
395 	if (!attr->single)
396 		return sk_ASN1_TYPE_value(attr->value.set, idx);
397 	else
398 		return attr->value.single;
399 }
400