1 /* $OpenBSD: x509_att.c,v 1.19 2022/05/09 19:19:33 jsing 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 #include "x509_lcl.h"
70 
71 int
72 X509at_get_attr_count(const STACK_OF(X509_ATTRIBUTE) *x)
73 {
74 	return sk_X509_ATTRIBUTE_num(x);
75 }
76 
77 int
78 X509at_get_attr_by_NID(const STACK_OF(X509_ATTRIBUTE) *x, int nid, int lastpos)
79 {
80 	ASN1_OBJECT *obj;
81 
82 	obj = OBJ_nid2obj(nid);
83 	if (obj == NULL)
84 		return (-2);
85 	return (X509at_get_attr_by_OBJ(x, obj, lastpos));
86 }
87 
88 int
89 X509at_get_attr_by_OBJ(const STACK_OF(X509_ATTRIBUTE) *sk,
90     const ASN1_OBJECT *obj, int lastpos)
91 {
92 	int n;
93 	X509_ATTRIBUTE *ex;
94 
95 	if (sk == NULL)
96 		return (-1);
97 	lastpos++;
98 	if (lastpos < 0)
99 		lastpos = 0;
100 	n = sk_X509_ATTRIBUTE_num(sk);
101 	for (; lastpos < n; lastpos++) {
102 		ex = sk_X509_ATTRIBUTE_value(sk, lastpos);
103 		if (OBJ_cmp(ex->object, obj) == 0)
104 			return (lastpos);
105 	}
106 	return (-1);
107 }
108 
109 X509_ATTRIBUTE *
110 X509at_get_attr(const STACK_OF(X509_ATTRIBUTE) *x, int loc)
111 {
112 	if (x == NULL || sk_X509_ATTRIBUTE_num(x) <= loc || loc < 0)
113 		return NULL;
114 	else
115 		return sk_X509_ATTRIBUTE_value(x, loc);
116 }
117 
118 X509_ATTRIBUTE *
119 X509at_delete_attr(STACK_OF(X509_ATTRIBUTE) *x, int loc)
120 {
121 	X509_ATTRIBUTE *ret;
122 
123 	if (x == NULL || sk_X509_ATTRIBUTE_num(x) <= loc || loc < 0)
124 		return (NULL);
125 	ret = sk_X509_ATTRIBUTE_delete(x, loc);
126 	return (ret);
127 }
128 
129 STACK_OF(X509_ATTRIBUTE) *
130 X509at_add1_attr(STACK_OF(X509_ATTRIBUTE) **x, X509_ATTRIBUTE *attr)
131 {
132 	X509_ATTRIBUTE *new_attr = NULL;
133 	STACK_OF(X509_ATTRIBUTE) *sk = NULL;
134 
135 	if (x == NULL) {
136 		X509error(ERR_R_PASSED_NULL_PARAMETER);
137 		return (NULL);
138 	}
139 
140 	if (*x == NULL) {
141 		if ((sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
142 			goto err;
143 	} else
144 		sk = *x;
145 
146 	if ((new_attr = X509_ATTRIBUTE_dup(attr)) == NULL)
147 		goto err2;
148 	if (!sk_X509_ATTRIBUTE_push(sk, new_attr))
149 		goto err;
150 	if (*x == NULL)
151 		*x = sk;
152 	return (sk);
153 
154 err:
155 	X509error(ERR_R_MALLOC_FAILURE);
156 err2:
157 	if (new_attr != NULL)
158 		X509_ATTRIBUTE_free(new_attr);
159 	if (sk != NULL && sk != *x)
160 		sk_X509_ATTRIBUTE_free(sk);
161 	return (NULL);
162 }
163 
164 STACK_OF(X509_ATTRIBUTE) *
165 X509at_add1_attr_by_OBJ(STACK_OF(X509_ATTRIBUTE) **x, const ASN1_OBJECT *obj,
166     int type, const unsigned char *bytes, int len)
167 {
168 	X509_ATTRIBUTE *attr;
169 	STACK_OF(X509_ATTRIBUTE) *ret;
170 
171 	attr = X509_ATTRIBUTE_create_by_OBJ(NULL, obj, type, bytes, len);
172 	if (!attr)
173 		return 0;
174 	ret = X509at_add1_attr(x, attr);
175 	X509_ATTRIBUTE_free(attr);
176 	return ret;
177 }
178 
179 STACK_OF(X509_ATTRIBUTE) *
180 X509at_add1_attr_by_NID(STACK_OF(X509_ATTRIBUTE) **x, int nid, int type,
181     const unsigned char *bytes, int len)
182 {
183 	X509_ATTRIBUTE *attr;
184 	STACK_OF(X509_ATTRIBUTE) *ret;
185 
186 	attr = X509_ATTRIBUTE_create_by_NID(NULL, nid, type, bytes, len);
187 	if (!attr)
188 		return 0;
189 	ret = X509at_add1_attr(x, attr);
190 	X509_ATTRIBUTE_free(attr);
191 	return ret;
192 }
193 
194 STACK_OF(X509_ATTRIBUTE) *
195 X509at_add1_attr_by_txt(STACK_OF(X509_ATTRIBUTE) **x, const char *attrname,
196     int type, const unsigned char *bytes, int len)
197 {
198 	X509_ATTRIBUTE *attr;
199 	STACK_OF(X509_ATTRIBUTE) *ret;
200 
201 	attr = X509_ATTRIBUTE_create_by_txt(NULL, attrname, type, bytes, len);
202 	if (!attr)
203 		return 0;
204 	ret = X509at_add1_attr(x, attr);
205 	X509_ATTRIBUTE_free(attr);
206 	return ret;
207 }
208 
209 void *
210 X509at_get0_data_by_OBJ(STACK_OF(X509_ATTRIBUTE) *x, const ASN1_OBJECT *obj,
211     int lastpos, int type)
212 {
213 	int i;
214 	X509_ATTRIBUTE *at;
215 
216 	i = X509at_get_attr_by_OBJ(x, obj, lastpos);
217 	if (i == -1)
218 		return NULL;
219 	if ((lastpos <= -2) && (X509at_get_attr_by_OBJ(x, obj, i) != -1))
220 		return NULL;
221 	at = X509at_get_attr(x, i);
222 	if (lastpos <= -3 && (X509_ATTRIBUTE_count(at) != 1))
223 		return NULL;
224 	return X509_ATTRIBUTE_get0_data(at, 0, type, NULL);
225 }
226 
227 X509_ATTRIBUTE *
228 X509_ATTRIBUTE_create_by_NID(X509_ATTRIBUTE **attr, int nid, int atrtype,
229     const void *data, int len)
230 {
231 	ASN1_OBJECT *obj;
232 	X509_ATTRIBUTE *ret;
233 
234 	obj = OBJ_nid2obj(nid);
235 	if (obj == NULL) {
236 		X509error(X509_R_UNKNOWN_NID);
237 		return (NULL);
238 	}
239 	ret = X509_ATTRIBUTE_create_by_OBJ(attr, obj, atrtype, data, len);
240 	if (ret == NULL)
241 		ASN1_OBJECT_free(obj);
242 	return (ret);
243 }
244 
245 X509_ATTRIBUTE *
246 X509_ATTRIBUTE_create_by_OBJ(X509_ATTRIBUTE **attr, const ASN1_OBJECT *obj,
247     int atrtype, const void *data, int len)
248 {
249 	X509_ATTRIBUTE *ret;
250 
251 	if ((attr == NULL) || (*attr == NULL)) {
252 		if ((ret = X509_ATTRIBUTE_new()) == NULL) {
253 			X509error(ERR_R_MALLOC_FAILURE);
254 			return (NULL);
255 		}
256 	} else
257 		ret= *attr;
258 
259 	if (!X509_ATTRIBUTE_set1_object(ret, obj))
260 		goto err;
261 	if (!X509_ATTRIBUTE_set1_data(ret, atrtype, data, len))
262 		goto err;
263 
264 	if ((attr != NULL) && (*attr == NULL))
265 		*attr = ret;
266 	return (ret);
267 
268 err:
269 	if ((attr == NULL) || (ret != *attr))
270 		X509_ATTRIBUTE_free(ret);
271 	return (NULL);
272 }
273 
274 X509_ATTRIBUTE *
275 X509_ATTRIBUTE_create_by_txt(X509_ATTRIBUTE **attr, const char *atrname,
276     int type, const unsigned char *bytes, int len)
277 {
278 	ASN1_OBJECT *obj;
279 	X509_ATTRIBUTE *nattr;
280 
281 	obj = OBJ_txt2obj(atrname, 0);
282 	if (obj == NULL) {
283 		X509error(X509_R_INVALID_FIELD_NAME);
284 		ERR_asprintf_error_data("name=%s", atrname);
285 		return (NULL);
286 	}
287 	nattr = X509_ATTRIBUTE_create_by_OBJ(attr, obj, type, bytes, len);
288 	ASN1_OBJECT_free(obj);
289 	return nattr;
290 }
291 
292 int
293 X509_ATTRIBUTE_set1_object(X509_ATTRIBUTE *attr, const ASN1_OBJECT *obj)
294 {
295 	if ((attr == NULL) || (obj == NULL))
296 		return (0);
297 	ASN1_OBJECT_free(attr->object);
298 	attr->object = OBJ_dup(obj);
299 	return attr->object != NULL;
300 }
301 
302 int
303 X509_ATTRIBUTE_set1_data(X509_ATTRIBUTE *attr, int attrtype, const void *data,
304     int len)
305 {
306 	ASN1_TYPE *ttmp = NULL;
307 	ASN1_STRING *stmp = NULL;
308 	int atype = 0;
309 
310 	if (!attr)
311 		return 0;
312 	if (attrtype & MBSTRING_FLAG) {
313 		stmp = ASN1_STRING_set_by_NID(NULL, data, len, attrtype,
314 		    OBJ_obj2nid(attr->object));
315 		if (!stmp) {
316 			X509error(ERR_R_ASN1_LIB);
317 			return 0;
318 		}
319 		atype = stmp->type;
320 	} else if (len != -1){
321 		if (!(stmp = ASN1_STRING_type_new(attrtype)))
322 			goto err;
323 		if (!ASN1_STRING_set(stmp, data, len))
324 			goto err;
325 		atype = attrtype;
326 	}
327 	/*
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->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 == NULL)
359 		return 0;
360 
361 	return sk_ASN1_TYPE_num(attr->set);
362 }
363 
364 ASN1_OBJECT *
365 X509_ATTRIBUTE_get0_object(X509_ATTRIBUTE *attr)
366 {
367 	if (attr == NULL)
368 		return (NULL);
369 	return (attr->object);
370 }
371 
372 void *
373 X509_ATTRIBUTE_get0_data(X509_ATTRIBUTE *attr, int idx, int atrtype, void *data)
374 {
375 	ASN1_TYPE *ttmp;
376 
377 	ttmp = X509_ATTRIBUTE_get0_type(attr, idx);
378 	if (!ttmp)
379 		return NULL;
380 	if (atrtype != ASN1_TYPE_get(ttmp)){
381 		X509error(X509_R_WRONG_TYPE);
382 		return NULL;
383 	}
384 	return ttmp->value.ptr;
385 }
386 
387 ASN1_TYPE *
388 X509_ATTRIBUTE_get0_type(X509_ATTRIBUTE *attr, int idx)
389 {
390 	if (attr == NULL)
391 		return (NULL);
392 
393 	return sk_ASN1_TYPE_value(attr->set, idx);
394 }
395