1 /* tasn_fre.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 2000.
4 */
5 /* ====================================================================
6 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59
60 #include <stddef.h>
61 #include <openssl/asn1.h>
62 #include <openssl/asn1t.h>
63 #include <openssl/objects.h>
64
65 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine);
66
67 /* Free up an ASN1 structure */
68
69 void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it)
70 {
71 asn1_item_combine_free(&val, it, 0);
72 }
73
74 void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
75 {
76 asn1_item_combine_free(pval, it, 0);
77 }
78
79 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine)
80 {
81 const ASN1_TEMPLATE *tt = NULL, *seqtt;
82 const ASN1_EXTERN_FUNCS *ef;
83 const ASN1_COMPAT_FUNCS *cf;
84 const ASN1_AUX *aux = it->funcs;
85 ASN1_aux_cb *asn1_cb;
86 int i;
87 if (!pval)
88 return;
89 if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval)
90 return;
91 if (aux && aux->asn1_cb)
92 asn1_cb = aux->asn1_cb;
93 else
94 asn1_cb = 0;
95
96 switch(it->itype)
97 {
98
99 case ASN1_ITYPE_PRIMITIVE:
100 if (it->templates)
101 ASN1_template_free(pval, it->templates);
102 else
103 ASN1_primitive_free(pval, it);
104 break;
105
106 case ASN1_ITYPE_MSTRING:
107 ASN1_primitive_free(pval, it);
108 break;
109
110 case ASN1_ITYPE_CHOICE:
111 if (asn1_cb)
112 {
113 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
114 if (i == 2)
115 return;
116 }
117 i = asn1_get_choice_selector(pval, it);
118 if ((i >= 0) && (i < it->tcount))
119 {
120 ASN1_VALUE **pchval;
121 tt = it->templates + i;
122 pchval = asn1_get_field_ptr(pval, tt);
123 ASN1_template_free(pchval, tt);
124 }
125 if (asn1_cb)
126 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
127 if (!combine)
128 {
129 OPENSSL_free(*pval);
130 *pval = NULL;
131 }
132 break;
133
134 case ASN1_ITYPE_COMPAT:
135 cf = it->funcs;
136 if (cf && cf->asn1_free)
137 cf->asn1_free(*pval);
138 break;
139
140 case ASN1_ITYPE_EXTERN:
141 ef = it->funcs;
142 if (ef && ef->asn1_ex_free)
143 ef->asn1_ex_free(pval, it);
144 break;
145
146 case ASN1_ITYPE_NDEF_SEQUENCE:
147 case ASN1_ITYPE_SEQUENCE:
148 if (asn1_do_lock(pval, -1, it) > 0)
149 return;
150 if (asn1_cb)
151 {
152 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
153 if (i == 2)
154 return;
155 }
156 asn1_enc_free(pval, it);
157 /* If we free up as normal we will invalidate any
158 * ANY DEFINED BY field and we wont be able to
159 * determine the type of the field it defines. So
160 * free up in reverse order.
161 */
162 tt = it->templates + it->tcount - 1;
163 for (i = 0; i < it->tcount; tt--, i++)
164 {
165 ASN1_VALUE **pseqval;
166 seqtt = asn1_do_adb(pval, tt, 0);
167 if (!seqtt)
168 continue;
169 pseqval = asn1_get_field_ptr(pval, seqtt);
170 ASN1_template_free(pseqval, seqtt);
171 }
172 if (asn1_cb)
173 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
174 if (!combine)
175 {
176 OPENSSL_free(*pval);
177 *pval = NULL;
178 }
179 break;
180 }
181 }
182
183 void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
184 {
185 int i;
186 if (tt->flags & ASN1_TFLG_SK_MASK)
187 {
188 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
189 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++)
190 {
191 ASN1_VALUE *vtmp;
192 vtmp = sk_ASN1_VALUE_value(sk, i);
193 asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item),
194 0);
195 }
196 sk_ASN1_VALUE_free(sk);
197 *pval = NULL;
198 }
199 else
200 asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item),
201 tt->flags & ASN1_TFLG_COMBINE);
202 }
203
204 void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
205 {
206 int utype;
207 if (it)
208 {
209 const ASN1_PRIMITIVE_FUNCS *pf;
210 pf = it->funcs;
211 if (pf && pf->prim_free)
212 {
213 pf->prim_free(pval, it);
214 return;
215 }
216 }
217 /* Special case: if 'it' is NULL free contents of ASN1_TYPE */
218 if (!it)
219 {
220 ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
221 utype = typ->type;
222 pval = &typ->value.asn1_value;
223 if (!*pval)
224 return;
225 }
226 else if (it->itype == ASN1_ITYPE_MSTRING)
227 {
228 utype = -1;
229 if (!*pval)
230 return;
231 }
232 else
233 {
234 utype = it->utype;
235 if ((utype != V_ASN1_BOOLEAN) && !*pval)
236 return;
237 }
238
239 switch(utype)
240 {
241 case V_ASN1_OBJECT:
242 ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
243 break;
244
245 case V_ASN1_BOOLEAN:
246 if (it)
247 *(ASN1_BOOLEAN *)pval = it->size;
248 else
249 *(ASN1_BOOLEAN *)pval = -1;
250 return;
251
252 case V_ASN1_NULL:
253 break;
254
255 case V_ASN1_ANY:
256 ASN1_primitive_free(pval, NULL);
257 OPENSSL_free(*pval);
258 break;
259
260 default:
261 ASN1_STRING_free((ASN1_STRING *)*pval);
262 *pval = NULL;
263 break;
264 }
265 *pval = NULL;
266 }