1 | /* |
2 | * Copyright 2000-2016 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 | |
18 | void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it) |
19 | { |
20 | asn1_item_embed_free(&val, it, 0); |
21 | } |
22 | |
23 | void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it) |
24 | { |
25 | asn1_item_embed_free(pval, it, 0); |
26 | } |
27 | |
28 | void 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 | asn1_template_free(pval, it->templates); |
50 | else |
51 | asn1_primitive_free(pval, it, embed); |
52 | break; |
53 | |
54 | case ASN1_ITYPE_MSTRING: |
55 | 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 = 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 = asn1_get_field_ptr(pval, tt); |
70 | 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 (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 | 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 = asn1_do_adb(*pval, tt, 0); |
107 | if (!seqtt) |
108 | continue; |
109 | pseqval = asn1_get_field_ptr(pval, seqtt); |
110 | 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 | |
122 | void 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 | asn1_item_embed_free(&vtmp, ASN1_ITEM_ptr(tt->item), embed); |
138 | } |
139 | sk_ASN1_VALUE_free(sk); |
140 | *pval = NULL; |
141 | } else { |
142 | asn1_item_embed_free(pval, ASN1_ITEM_ptr(tt->item), embed); |
143 | } |
144 | } |
145 | |
146 | void 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 | asn1_primitive_free(pval, NULL, 0); |
200 | OPENSSL_free(*pval); |
201 | break; |
202 | |
203 | default: |
204 | asn1_string_embed_free((ASN1_STRING *)*pval, embed); |
205 | break; |
206 | } |
207 | *pval = NULL; |
208 | } |
209 | |