1 /*
2 * Copyright 2000-2024 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <stddef.h>
11 #include <openssl/asn1.h>
12 #include <openssl/asn1t.h>
13 #include <openssl/objects.h>
14 #include "asn1_local.h"
15
16 /* Free up an ASN1 structure */
17
ASN1_item_free(ASN1_VALUE * val,const ASN1_ITEM * it)18 void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it)
19 {
20 ossl_asn1_item_embed_free(&val, it, 0);
21 }
22
ASN1_item_ex_free(ASN1_VALUE ** pval,const ASN1_ITEM * it)23 void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
24 {
25 ossl_asn1_item_embed_free(pval, it, 0);
26 }
27
ossl_asn1_item_embed_free(ASN1_VALUE ** pval,const ASN1_ITEM * it,int embed)28 void ossl_asn1_item_embed_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int embed)
29 {
30 const ASN1_TEMPLATE *tt = NULL, *seqtt;
31 const ASN1_EXTERN_FUNCS *ef;
32 const ASN1_AUX *aux = it->funcs;
33 ASN1_aux_cb *asn1_cb;
34 int i;
35
36 if (pval == NULL)
37 return;
38 if ((it->itype != ASN1_ITYPE_PRIMITIVE) && *pval == NULL)
39 return;
40 if (aux && aux->asn1_cb)
41 asn1_cb = aux->asn1_cb;
42 else
43 asn1_cb = 0;
44
45 switch (it->itype) {
46
47 case ASN1_ITYPE_PRIMITIVE:
48 if (it->templates)
49 ossl_asn1_template_free(pval, it->templates);
50 else
51 ossl_asn1_primitive_free(pval, it, embed);
52 break;
53
54 case ASN1_ITYPE_MSTRING:
55 ossl_asn1_primitive_free(pval, it, embed);
56 break;
57
58 case ASN1_ITYPE_CHOICE:
59 if (asn1_cb) {
60 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
61 if (i == 2)
62 return;
63 }
64 i = ossl_asn1_get_choice_selector(pval, it);
65 if ((i >= 0) && (i < it->tcount)) {
66 ASN1_VALUE **pchval;
67
68 tt = it->templates + i;
69 pchval = ossl_asn1_get_field_ptr(pval, tt);
70 ossl_asn1_template_free(pchval, tt);
71 }
72 if (asn1_cb)
73 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
74 if (embed == 0) {
75 OPENSSL_free(*pval);
76 *pval = NULL;
77 }
78 break;
79
80 case ASN1_ITYPE_EXTERN:
81 ef = it->funcs;
82 if (ef && ef->asn1_ex_free)
83 ef->asn1_ex_free(pval, it);
84 break;
85
86 case ASN1_ITYPE_NDEF_SEQUENCE:
87 case ASN1_ITYPE_SEQUENCE:
88 if (ossl_asn1_do_lock(pval, -1, it) != 0) {
89 /* if error or ref-counter > 0 */
90 OPENSSL_assert(embed == 0);
91 *pval = NULL;
92 return;
93 }
94 if (asn1_cb) {
95 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
96 if (i == 2)
97 return;
98 }
99 ossl_asn1_enc_free(pval, it);
100 /*
101 * If we free up as normal we will invalidate any ANY DEFINED BY
102 * field and we won't be able to determine the type of the field it
103 * defines. So free up in reverse order.
104 */
105 tt = it->templates + it->tcount;
106 for (i = 0; i < it->tcount; i++) {
107 ASN1_VALUE **pseqval;
108
109 tt--;
110 seqtt = ossl_asn1_do_adb(*pval, tt, 0);
111 if (!seqtt)
112 continue;
113 pseqval = ossl_asn1_get_field_ptr(pval, seqtt);
114 ossl_asn1_template_free(pseqval, seqtt);
115 }
116 if (asn1_cb)
117 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
118 if (embed == 0) {
119 OPENSSL_free(*pval);
120 *pval = NULL;
121 }
122 break;
123 }
124 }
125
ossl_asn1_template_free(ASN1_VALUE ** pval,const ASN1_TEMPLATE * tt)126 void ossl_asn1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
127 {
128 int embed = tt->flags & ASN1_TFLG_EMBED;
129 ASN1_VALUE *tval;
130 if (embed) {
131 tval = (ASN1_VALUE *)pval;
132 pval = &tval;
133 }
134 if (tt->flags & ASN1_TFLG_SK_MASK) {
135 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
136 int i;
137
138 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
139 ASN1_VALUE *vtmp = sk_ASN1_VALUE_value(sk, i);
140
141 ossl_asn1_item_embed_free(&vtmp, ASN1_ITEM_ptr(tt->item), embed);
142 }
143 sk_ASN1_VALUE_free(sk);
144 *pval = NULL;
145 } else {
146 ossl_asn1_item_embed_free(pval, ASN1_ITEM_ptr(tt->item), embed);
147 }
148 }
149
ossl_asn1_primitive_free(ASN1_VALUE ** pval,const ASN1_ITEM * it,int embed)150 void ossl_asn1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int embed)
151 {
152 int utype;
153
154 /* Special case: if 'it' is a primitive with a free_func, use that. */
155 if (it) {
156 const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
157
158 if (embed) {
159 if (pf && pf->prim_clear) {
160 pf->prim_clear(pval, it);
161 return;
162 }
163 } else if (pf && pf->prim_free) {
164 pf->prim_free(pval, it);
165 return;
166 }
167 }
168
169 /* Special case: if 'it' is NULL, free contents of ASN1_TYPE */
170 if (!it) {
171 ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
172
173 utype = typ->type;
174 pval = &typ->value.asn1_value;
175 if (*pval == NULL)
176 return;
177 } else if (it->itype == ASN1_ITYPE_MSTRING) {
178 utype = -1;
179 if (*pval == NULL)
180 return;
181 } else {
182 utype = it->utype;
183 if ((utype != V_ASN1_BOOLEAN) && *pval == NULL)
184 return;
185 }
186
187 switch (utype) {
188 case V_ASN1_OBJECT:
189 ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
190 break;
191
192 case V_ASN1_BOOLEAN:
193 if (it)
194 *(ASN1_BOOLEAN *)pval = it->size;
195 else
196 *(ASN1_BOOLEAN *)pval = -1;
197 return;
198
199 case V_ASN1_NULL:
200 break;
201
202 case V_ASN1_ANY:
203 ossl_asn1_primitive_free(pval, NULL, 0);
204 OPENSSL_free(*pval);
205 break;
206
207 default:
208 ossl_asn1_string_embed_free((ASN1_STRING *)*pval, embed);
209 break;
210 }
211 *pval = NULL;
212 }
213
