1 /*
2 * Copyright 2000-2021 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) /* if error or ref-counter > 0 */
89 return;
90 if (asn1_cb) {
91 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
92 if (i == 2)
93 return;
94 }
95 ossl_asn1_enc_free(pval, it);
96 /*
97 * If we free up as normal we will invalidate any ANY DEFINED BY
98 * field and we won't be able to determine the type of the field it
99 * defines. So free up in reverse order.
100 */
101 tt = it->templates + it->tcount;
102 for (i = 0; i < it->tcount; i++) {
103 ASN1_VALUE **pseqval;
104
105 tt--;
106 seqtt = ossl_asn1_do_adb(*pval, tt, 0);
107 if (!seqtt)
108 continue;
109 pseqval = ossl_asn1_get_field_ptr(pval, seqtt);
110 ossl_asn1_template_free(pseqval, seqtt);
111 }
112 if (asn1_cb)
113 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
114 if (embed == 0) {
115 OPENSSL_free(*pval);
116 *pval = NULL;
117 }
118 break;
119 }
120 }
121
ossl_asn1_template_free(ASN1_VALUE ** pval,const ASN1_TEMPLATE * tt)122 void ossl_asn1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
123 {
124 int embed = tt->flags & ASN1_TFLG_EMBED;
125 ASN1_VALUE *tval;
126 if (embed) {
127 tval = (ASN1_VALUE *)pval;
128 pval = &tval;
129 }
130 if (tt->flags & ASN1_TFLG_SK_MASK) {
131 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
132 int i;
133
134 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
135 ASN1_VALUE *vtmp = sk_ASN1_VALUE_value(sk, i);
136
137 ossl_asn1_item_embed_free(&vtmp, ASN1_ITEM_ptr(tt->item), embed);
138 }
139 sk_ASN1_VALUE_free(sk);
140 *pval = NULL;
141 } else {
142 ossl_asn1_item_embed_free(pval, ASN1_ITEM_ptr(tt->item), embed);
143 }
144 }
145
ossl_asn1_primitive_free(ASN1_VALUE ** pval,const ASN1_ITEM * it,int embed)146 void ossl_asn1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int embed)
147 {
148 int utype;
149
150 /* Special case: if 'it' is a primitive with a free_func, use that. */
151 if (it) {
152 const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
153
154 if (embed) {
155 if (pf && pf->prim_clear) {
156 pf->prim_clear(pval, it);
157 return;
158 }
159 } else if (pf && pf->prim_free) {
160 pf->prim_free(pval, it);
161 return;
162 }
163 }
164
165 /* Special case: if 'it' is NULL, free contents of ASN1_TYPE */
166 if (!it) {
167 ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
168
169 utype = typ->type;
170 pval = &typ->value.asn1_value;
171 if (*pval == NULL)
172 return;
173 } else if (it->itype == ASN1_ITYPE_MSTRING) {
174 utype = -1;
175 if (*pval == NULL)
176 return;
177 } else {
178 utype = it->utype;
179 if ((utype != V_ASN1_BOOLEAN) && *pval == NULL)
180 return;
181 }
182
183 switch (utype) {
184 case V_ASN1_OBJECT:
185 ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
186 break;
187
188 case V_ASN1_BOOLEAN:
189 if (it)
190 *(ASN1_BOOLEAN *)pval = it->size;
191 else
192 *(ASN1_BOOLEAN *)pval = -1;
193 return;
194
195 case V_ASN1_NULL:
196 break;
197
198 case V_ASN1_ANY:
199 ossl_asn1_primitive_free(pval, NULL, 0);
200 OPENSSL_free(*pval);
201 break;
202
203 default:
204 ossl_asn1_string_embed_free((ASN1_STRING *)*pval, embed);
205 break;
206 }
207 *pval = NULL;
208 }
209