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 <openssl/asn1t.h>
60 #include <openssl/mem.h>
61
62 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it,
63 int combine);
64
65 /* Free up an ASN1 structure */
66
ASN1_item_free(ASN1_VALUE * val,const ASN1_ITEM * it)67 void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it)
68 {
69 asn1_item_combine_free(&val, it, 0);
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 {
74 asn1_item_combine_free(pval, it, 0);
75 }
76
asn1_item_combine_free(ASN1_VALUE ** pval,const ASN1_ITEM * it,int combine)77 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it,
78 int combine)
79 {
80 const ASN1_TEMPLATE *tt = NULL, *seqtt;
81 const ASN1_EXTERN_FUNCS *ef;
82 const ASN1_COMPAT_FUNCS *cf;
83 const ASN1_AUX *aux = it->funcs;
84 ASN1_aux_cb *asn1_cb;
85 int i;
86 if (!pval)
87 return;
88 if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval)
89 return;
90 if (aux && aux->asn1_cb)
91 asn1_cb = aux->asn1_cb;
92 else
93 asn1_cb = 0;
94
95 switch (it->itype) {
96
97 case ASN1_ITYPE_PRIMITIVE:
98 if (it->templates)
99 ASN1_template_free(pval, it->templates);
100 else
101 ASN1_primitive_free(pval, it);
102 break;
103
104 case ASN1_ITYPE_MSTRING:
105 ASN1_primitive_free(pval, it);
106 break;
107
108 case ASN1_ITYPE_CHOICE:
109 if (asn1_cb) {
110 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
111 if (i == 2)
112 return;
113 }
114 i = asn1_get_choice_selector(pval, it);
115 if ((i >= 0) && (i < it->tcount)) {
116 ASN1_VALUE **pchval;
117 tt = it->templates + i;
118 pchval = asn1_get_field_ptr(pval, tt);
119 ASN1_template_free(pchval, tt);
120 }
121 if (asn1_cb)
122 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
123 if (!combine) {
124 OPENSSL_free(*pval);
125 *pval = NULL;
126 }
127 break;
128
129 case ASN1_ITYPE_COMPAT:
130 cf = it->funcs;
131 if (cf && cf->asn1_free)
132 cf->asn1_free(*pval);
133 break;
134
135 case ASN1_ITYPE_EXTERN:
136 ef = it->funcs;
137 if (ef && ef->asn1_ex_free)
138 ef->asn1_ex_free(pval, it);
139 break;
140
141 case ASN1_ITYPE_NDEF_SEQUENCE:
142 case ASN1_ITYPE_SEQUENCE:
143 if (!asn1_refcount_dec_and_test_zero(pval, it))
144 return;
145 if (asn1_cb) {
146 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
147 if (i == 2)
148 return;
149 }
150 asn1_enc_free(pval, it);
151 /*
152 * If we free up as normal we will invalidate any ANY DEFINED BY
153 * field and we wont be able to determine the type of the field it
154 * defines. So free up in reverse order.
155 */
156 tt = it->templates + it->tcount - 1;
157 for (i = 0; i < it->tcount; tt--, i++) {
158 ASN1_VALUE **pseqval;
159 seqtt = asn1_do_adb(pval, tt, 0);
160 if (!seqtt)
161 continue;
162 pseqval = asn1_get_field_ptr(pval, seqtt);
163 ASN1_template_free(pseqval, seqtt);
164 }
165 if (asn1_cb)
166 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
167 if (!combine) {
168 OPENSSL_free(*pval);
169 *pval = NULL;
170 }
171 break;
172 }
173 }
174
ASN1_template_free(ASN1_VALUE ** pval,const ASN1_TEMPLATE * tt)175 void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
176 {
177 size_t i;
178 if (tt->flags & ASN1_TFLG_SK_MASK) {
179 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
180 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
181 ASN1_VALUE *vtmp;
182 vtmp = sk_ASN1_VALUE_value(sk, i);
183 asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item), 0);
184 }
185 sk_ASN1_VALUE_free(sk);
186 *pval = NULL;
187 } else
188 asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item),
189 tt->flags & ASN1_TFLG_COMBINE);
190 }
191
ASN1_primitive_free(ASN1_VALUE ** pval,const ASN1_ITEM * it)192 void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
193 {
194 int utype;
195 if (it) {
196 const ASN1_PRIMITIVE_FUNCS *pf;
197 pf = it->funcs;
198 if (pf && pf->prim_free) {
199 pf->prim_free(pval, it);
200 return;
201 }
202 }
203 /* Special case: if 'it' is NULL free contents of ASN1_TYPE */
204 if (!it) {
205 ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
206 utype = typ->type;
207 pval = &typ->value.asn1_value;
208 if (!*pval)
209 return;
210 } else if (it->itype == ASN1_ITYPE_MSTRING) {
211 utype = -1;
212 if (!*pval)
213 return;
214 } else {
215 utype = it->utype;
216 if ((utype != V_ASN1_BOOLEAN) && !*pval)
217 return;
218 }
219
220 switch (utype) {
221 case V_ASN1_OBJECT:
222 ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
223 break;
224
225 case V_ASN1_BOOLEAN:
226 if (it)
227 *(ASN1_BOOLEAN *)pval = it->size;
228 else
229 *(ASN1_BOOLEAN *)pval = -1;
230 return;
231
232 case V_ASN1_NULL:
233 break;
234
235 case V_ASN1_ANY:
236 ASN1_primitive_free(pval, NULL);
237 OPENSSL_free(*pval);
238 break;
239
240 default:
241 ASN1_STRING_free((ASN1_STRING *)*pval);
242 *pval = NULL;
243 break;
244 }
245 *pval = NULL;
246 }
247