x509_att.c revision 1.16 
1/* $OpenBSD: x509_att.c,v 1.16 2018/05/13 06:48:00 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
69int
70X509at_get_attr_count(const STACK_OF(X509_ATTRIBUTE) *x)
71{
72	return sk_X509_ATTRIBUTE_num(x);
73}
74
75int
76X509at_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
86int
87X509at_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
107X509_ATTRIBUTE *
108X509at_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
116X509_ATTRIBUTE *
117X509at_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
127STACK_OF(X509_ATTRIBUTE) *
128X509at_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
152err:
153	X509error(ERR_R_MALLOC_FAILURE);
154err2:
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
162STACK_OF(X509_ATTRIBUTE) *
163X509at_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
177STACK_OF(X509_ATTRIBUTE) *
178X509at_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
192STACK_OF(X509_ATTRIBUTE) *
193X509at_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
207void *
208X509at_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
225X509_ATTRIBUTE *
226X509_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
243X509_ATTRIBUTE *
244X509_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
266err:
267	if ((attr == NULL) || (ret != *attr))
268		X509_ATTRIBUTE_free(ret);
269	return (NULL);
270}
271
272X509_ATTRIBUTE *
273X509_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
290int
291X509_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
300int
301X509_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
348err:
349	ASN1_TYPE_free(ttmp);
350	ASN1_STRING_free(stmp);
351	X509error(ERR_R_MALLOC_FAILURE);
352	return 0;
353}
354
355int
356X509_ATTRIBUTE_count(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
365ASN1_OBJECT *
366X509_ATTRIBUTE_get0_object(X509_ATTRIBUTE *attr)
367{
368	if (attr == NULL)
369		return (NULL);
370	return (attr->object);
371}
372
373void *
374X509_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
388ASN1_TYPE *
389X509_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