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 <openssl/asn1.h>
58
59#include <openssl/asn1t.h>
60#include <openssl/mem.h>
61
62#include "asn1_locl.h"
63
64/* Free up an ASN1 structure */
65
66void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it)
67{
68 asn1_item_combine_free(&val, it, 0);
69}
70
71void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
72{
73 asn1_item_combine_free(pval, it, 0);
74}
75
76void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine)
77{
78 const ASN1_TEMPLATE *tt = NULL, *seqtt;
79 const ASN1_EXTERN_FUNCS *ef;
80 const ASN1_COMPAT_FUNCS *cf;
81 const ASN1_AUX *aux = it->funcs;
82 ASN1_aux_cb *asn1_cb;
83 int i;
84 if (!pval)
85 return;
86 if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval)
87 return;
88 if (aux && aux->asn1_cb)
89 asn1_cb = aux->asn1_cb;
90 else
91 asn1_cb = 0;
92
93 switch (it->itype) {
94
95 case ASN1_ITYPE_PRIMITIVE:
96 if (it->templates)
97 ASN1_template_free(pval, it->templates);
98 else
99 ASN1_primitive_free(pval, it);
100 break;
101
102 case ASN1_ITYPE_MSTRING:
103 ASN1_primitive_free(pval, it);
104 break;
105
106 case ASN1_ITYPE_CHOICE:
107 if (asn1_cb) {
108 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
109 if (i == 2)
110 return;
111 }
112 i = asn1_get_choice_selector(pval, it);
113 if ((i >= 0) && (i < it->tcount)) {
114 ASN1_VALUE **pchval;
115 tt = it->templates + i;
116 pchval = asn1_get_field_ptr(pval, tt);
117 ASN1_template_free(pchval, tt);
118 }
119 if (asn1_cb)
120 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
121 if (!combine) {
122 OPENSSL_free(*pval);
123 *pval = NULL;
124 }
125 break;
126
127 case ASN1_ITYPE_COMPAT:
128 cf = it->funcs;
129 if (cf && cf->asn1_free)
130 cf->asn1_free(*pval);
131 break;
132
133 case ASN1_ITYPE_EXTERN:
134 ef = it->funcs;
135 if (ef && ef->asn1_ex_free)
136 ef->asn1_ex_free(pval, it);
137 break;
138
139 case ASN1_ITYPE_NDEF_SEQUENCE:
140 case ASN1_ITYPE_SEQUENCE:
141 if (!asn1_refcount_dec_and_test_zero(pval, it))
142 return;
143 if (asn1_cb) {
144 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
145 if (i == 2)
146 return;
147 }
148 asn1_enc_free(pval, it);
149 /*
150 * If we free up as normal we will invalidate any ANY DEFINED BY
151 * field and we wont be able to determine the type of the field it
152 * defines. So free up in reverse order.
153 */
154 tt = it->templates + it->tcount - 1;
155 for (i = 0; i < it->tcount; tt--, i++) {
156 ASN1_VALUE **pseqval;
157 seqtt = asn1_do_adb(pval, tt, 0);
158 if (!seqtt)
159 continue;
160 pseqval = asn1_get_field_ptr(pval, seqtt);
161 ASN1_template_free(pseqval, seqtt);
162 }
163 if (asn1_cb)
164 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
165 if (!combine) {
166 OPENSSL_free(*pval);
167 *pval = NULL;
168 }
169 break;
170 }
171}
172
173void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
174{
175 size_t i;
176 if (tt->flags & ASN1_TFLG_SK_MASK) {
177 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
178 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
179 ASN1_VALUE *vtmp;
180 vtmp = sk_ASN1_VALUE_value(sk, i);
181 asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item), 0);
182 }
183 sk_ASN1_VALUE_free(sk);
184 *pval = NULL;
185 } else
186 asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item),
187 tt->flags & ASN1_TFLG_COMBINE);
188}
189
190void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
191{
192 int utype;
193 if (it) {
194 const ASN1_PRIMITIVE_FUNCS *pf;
195 pf = it->funcs;
196 if (pf && pf->prim_free) {
197 pf->prim_free(pval, it);
198 return;
199 }
200 }
201 /* Special case: if 'it' is NULL free contents of ASN1_TYPE */
202 if (!it) {
203 ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
204 utype = typ->type;
205 pval = &typ->value.asn1_value;
206 if (!*pval)
207 return;
208 } else if (it->itype == ASN1_ITYPE_MSTRING) {
209 utype = -1;
210 if (!*pval)
211 return;
212 } else {
213 utype = it->utype;
214 if ((utype != V_ASN1_BOOLEAN) && !*pval)
215 return;
216 }
217
218 switch (utype) {
219 case V_ASN1_OBJECT:
220 ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
221 break;
222
223 case V_ASN1_BOOLEAN:
224 if (it)
225 *(ASN1_BOOLEAN *)pval = it->size;
226 else
227 *(ASN1_BOOLEAN *)pval = -1;
228 return;
229
230 case V_ASN1_NULL:
231 break;
232
233 case V_ASN1_ANY:
234 ASN1_primitive_free(pval, NULL);
235 OPENSSL_free(*pval);
236 break;
237
238 default:
239 ASN1_STRING_free((ASN1_STRING *)*pval);
240 *pval = NULL;
241 break;
242 }
243 *pval = NULL;
244}
245