1 /* $OpenBSD: tasn_fre.c,v 1.20 2022/05/12 19:55:58 jsing Exp $ */
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 #include "asn1_locl.h"
66
67 static void asn1_item_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
68
69 /* Free up an ASN1 structure */
70
71 void
ASN1_item_free(ASN1_VALUE * val,const ASN1_ITEM * it)72 ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it)
73 {
74 asn1_item_free(&val, it);
75 }
76
77 void
ASN1_item_ex_free(ASN1_VALUE ** pval,const ASN1_ITEM * it)78 ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
79 {
80 asn1_item_free(pval, it);
81 }
82
83 static void
asn1_item_free(ASN1_VALUE ** pval,const ASN1_ITEM * it)84 asn1_item_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
85 {
86 const ASN1_TEMPLATE *tt = NULL, *seqtt;
87 const ASN1_EXTERN_FUNCS *ef;
88 const ASN1_AUX *aux = it->funcs;
89 ASN1_aux_cb *asn1_cb = NULL;
90 int i;
91
92 if (pval == NULL)
93 return;
94 /* For primitive types *pval may be something other than C pointer. */
95 if (it->itype != ASN1_ITYPE_PRIMITIVE && *pval == NULL)
96 return;
97
98 if (aux != NULL && aux->asn1_cb != NULL)
99 asn1_cb = aux->asn1_cb;
100
101 switch (it->itype) {
102 case ASN1_ITYPE_PRIMITIVE:
103 if (it->templates)
104 ASN1_template_free(pval, it->templates);
105 else
106 ASN1_primitive_free(pval, it);
107 break;
108
109 case ASN1_ITYPE_MSTRING:
110 ASN1_primitive_free(pval, it);
111 break;
112
113 case ASN1_ITYPE_CHOICE:
114 if (asn1_cb) {
115 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
116 if (i == 2)
117 return;
118 }
119 i = asn1_get_choice_selector(pval, it);
120 if ((i >= 0) && (i < it->tcount)) {
121 ASN1_VALUE **pchval;
122 tt = it->templates + i;
123 pchval = asn1_get_field_ptr(pval, tt);
124 ASN1_template_free(pchval, tt);
125 }
126 if (asn1_cb)
127 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
128 free(*pval);
129 *pval = NULL;
130 break;
131
132 case ASN1_ITYPE_EXTERN:
133 ef = it->funcs;
134 if (ef && ef->asn1_ex_free)
135 ef->asn1_ex_free(pval, it);
136 break;
137
138 case ASN1_ITYPE_NDEF_SEQUENCE:
139 case ASN1_ITYPE_SEQUENCE:
140 if (asn1_do_lock(pval, -1, it) > 0)
141 return;
142 if (asn1_cb) {
143 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
144 if (i == 2)
145 return;
146 }
147 asn1_enc_cleanup(pval, it);
148 /* If we free up as normal we will invalidate any
149 * ANY DEFINED BY field and we wont be able to
150 * determine the type of the field it defines. So
151 * free up in reverse order.
152 */
153 tt = it->templates + it->tcount - 1;
154 for (i = 0; i < it->tcount; tt--, i++) {
155 ASN1_VALUE **pseqval;
156 seqtt = asn1_do_adb(pval, tt, 0);
157 if (!seqtt)
158 continue;
159 pseqval = asn1_get_field_ptr(pval, seqtt);
160 ASN1_template_free(pseqval, seqtt);
161 }
162 if (asn1_cb)
163 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
164 free(*pval);
165 *pval = NULL;
166 break;
167 }
168 }
169
170 void
ASN1_template_free(ASN1_VALUE ** pval,const ASN1_TEMPLATE * tt)171 ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
172 {
173 int i;
174 if (tt->flags & ASN1_TFLG_SK_MASK) {
175 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
176 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
177 ASN1_VALUE *vtmp;
178 vtmp = sk_ASN1_VALUE_value(sk, i);
179 asn1_item_free(&vtmp, tt->item);
180 }
181 sk_ASN1_VALUE_free(sk);
182 *pval = NULL;
183 } else
184 asn1_item_free(pval, tt->item);
185 }
186
187 void
ASN1_primitive_free(ASN1_VALUE ** pval,const ASN1_ITEM * it)188 ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
189 {
190 int utype;
191
192 if (it != NULL && it->funcs != NULL) {
193 const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
194
195 pf->prim_free(pval, it);
196 return;
197 }
198
199 /* Special case: if 'it' is NULL free contents of ASN1_TYPE */
200 if (!it) {
201 ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
202 utype = typ->type;
203 pval = &typ->value.asn1_value;
204 if (!*pval)
205 return;
206 } else if (it->itype == ASN1_ITYPE_MSTRING) {
207 utype = -1;
208 if (!*pval)
209 return;
210 } else {
211 utype = it->utype;
212 if ((utype != V_ASN1_BOOLEAN) && !*pval)
213 return;
214 }
215
216 switch (utype) {
217 case V_ASN1_OBJECT:
218 ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
219 break;
220
221 case V_ASN1_BOOLEAN:
222 if (it)
223 *(ASN1_BOOLEAN *)pval = it->size;
224 else
225 *(ASN1_BOOLEAN *)pval = -1;
226 return;
227
228 case V_ASN1_NULL:
229 break;
230
231 case V_ASN1_ANY:
232 ASN1_primitive_free(pval, NULL);
233 free(*pval);
234 break;
235
236 default:
237 ASN1_STRING_free((ASN1_STRING *)*pval);
238 break;
239 }
240 *pval = NULL;
241 }
242