1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57 #include <openssl/asn1.h>
58
59 #include <assert.h>
60
61 #include <openssl/asn1t.h>
62 #include <openssl/mem.h>
63
64 #include "internal.h"
65
66 // Free up an ASN1 structure
67
ASN1_item_free(ASN1_VALUE * val,const ASN1_ITEM * it)68 void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it) {
69 ASN1_item_ex_free(&val, it);
70 }
71
ASN1_item_ex_free(ASN1_VALUE ** pval,const ASN1_ITEM * it)72 void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it) {
73 const ASN1_TEMPLATE *tt = NULL, *seqtt;
74 const ASN1_EXTERN_FUNCS *ef;
75 int i;
76 if (!pval) {
77 return;
78 }
79 if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval) {
80 return;
81 }
82
83 switch (it->itype) {
84 case ASN1_ITYPE_PRIMITIVE:
85 if (it->templates) {
86 ASN1_template_free(pval, it->templates);
87 } else {
88 ASN1_primitive_free(pval, it);
89 }
90 break;
91
92 case ASN1_ITYPE_MSTRING:
93 ASN1_primitive_free(pval, it);
94 break;
95
96 case ASN1_ITYPE_CHOICE: {
97 const ASN1_AUX *aux = it->funcs;
98 ASN1_aux_cb *asn1_cb = aux != NULL ? aux->asn1_cb : NULL;
99 if (asn1_cb) {
100 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
101 if (i == 2) {
102 return;
103 }
104 }
105 i = asn1_get_choice_selector(pval, it);
106 if ((i >= 0) && (i < it->tcount)) {
107 ASN1_VALUE **pchval;
108 tt = it->templates + i;
109 pchval = asn1_get_field_ptr(pval, tt);
110 ASN1_template_free(pchval, tt);
111 }
112 if (asn1_cb) {
113 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
114 }
115 OPENSSL_free(*pval);
116 *pval = NULL;
117 break;
118 }
119
120 case ASN1_ITYPE_EXTERN:
121 ef = it->funcs;
122 if (ef && ef->asn1_ex_free) {
123 ef->asn1_ex_free(pval, it);
124 }
125 break;
126
127 case ASN1_ITYPE_SEQUENCE: {
128 if (!asn1_refcount_dec_and_test_zero(pval, it)) {
129 return;
130 }
131 const ASN1_AUX *aux = it->funcs;
132 ASN1_aux_cb *asn1_cb = aux != NULL ? aux->asn1_cb : NULL;
133 if (asn1_cb) {
134 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
135 if (i == 2) {
136 return;
137 }
138 }
139 asn1_enc_free(pval, it);
140 // If we free up as normal we will invalidate any ANY DEFINED BY
141 // field and we wont be able to determine the type of the field it
142 // defines. So free up in reverse order.
143 tt = it->templates + it->tcount - 1;
144 for (i = 0; i < it->tcount; tt--, i++) {
145 ASN1_VALUE **pseqval;
146 seqtt = asn1_do_adb(pval, tt, 0);
147 if (!seqtt) {
148 continue;
149 }
150 pseqval = asn1_get_field_ptr(pval, seqtt);
151 ASN1_template_free(pseqval, seqtt);
152 }
153 if (asn1_cb) {
154 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
155 }
156 OPENSSL_free(*pval);
157 *pval = NULL;
158 break;
159 }
160 }
161 }
162
ASN1_template_free(ASN1_VALUE ** pval,const ASN1_TEMPLATE * tt)163 void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) {
164 if (tt->flags & ASN1_TFLG_SK_MASK) {
165 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
166 for (size_t i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
167 ASN1_VALUE *vtmp = sk_ASN1_VALUE_value(sk, i);
168 ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item));
169 }
170 sk_ASN1_VALUE_free(sk);
171 *pval = NULL;
172 } else {
173 ASN1_item_ex_free(pval, ASN1_ITEM_ptr(tt->item));
174 }
175 }
176
ASN1_primitive_free(ASN1_VALUE ** pval,const ASN1_ITEM * it)177 void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it) {
178 // Historically, |it->funcs| for primitive types contained an
179 // |ASN1_PRIMITIVE_FUNCS| table of calbacks.
180 assert(it->funcs == NULL);
181
182 int utype = it->itype == ASN1_ITYPE_MSTRING ? -1 : it->utype;
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 = (ASN1_BOOLEAN)it->size;
191 } else {
192 *(ASN1_BOOLEAN *)pval = ASN1_BOOLEAN_NONE;
193 }
194 return;
195
196 case V_ASN1_NULL:
197 break;
198
199 case V_ASN1_ANY:
200 if (*pval != NULL) {
201 asn1_type_cleanup((ASN1_TYPE *)*pval);
202 OPENSSL_free(*pval);
203 }
204 break;
205
206 default:
207 ASN1_STRING_free((ASN1_STRING *)*pval);
208 *pval = NULL;
209 break;
210 }
211 *pval = NULL;
212 }
213