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
63 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, 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, int combine)
78 {
79 const ASN1_TEMPLATE *tt = NULL, *seqtt;
80 const ASN1_EXTERN_FUNCS *ef;
81 const ASN1_COMPAT_FUNCS *cf;
82 const ASN1_AUX *aux = it->funcs;
83 ASN1_aux_cb *asn1_cb;
84 int i;
85 if (!pval)
86 return;
87 if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval)
88 return;
89 if (aux && aux->asn1_cb)
90 asn1_cb = aux->asn1_cb;
91 else
92 asn1_cb = 0;
93
94 switch(it->itype)
95 {
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 {
111 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
112 if (i == 2)
113 return;
114 }
115 i = asn1_get_choice_selector(pval, it);
116 if ((i >= 0) && (i < it->tcount))
117 {
118 ASN1_VALUE **pchval;
119 tt = it->templates + i;
120 pchval = asn1_get_field_ptr(pval, tt);
121 ASN1_template_free(pchval, tt);
122 }
123 if (asn1_cb)
124 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
125 if (!combine)
126 {
127 OPENSSL_free(*pval);
128 *pval = NULL;
129 }
130 break;
131
132 case ASN1_ITYPE_COMPAT:
133 cf = it->funcs;
134 if (cf && cf->asn1_free)
135 cf->asn1_free(*pval);
136 break;
137
138 case ASN1_ITYPE_EXTERN:
139 ef = it->funcs;
140 if (ef && ef->asn1_ex_free)
141 ef->asn1_ex_free(pval, it);
142 break;
143
144 case ASN1_ITYPE_NDEF_SEQUENCE:
145 case ASN1_ITYPE_SEQUENCE:
146 if (!asn1_refcount_dec_and_test_zero(pval, it))
147 return;
148 if (asn1_cb)
149 {
150 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
151 if (i == 2)
152 return;
153 }
154 asn1_enc_free(pval, it);
155 /* If we free up as normal we will invalidate any
156 * ANY DEFINED BY field and we wont be able to
157 * determine the type of the field it defines. So
158 * free up in reverse order.
159 */
160 tt = it->templates + it->tcount - 1;
161 for (i = 0; i < it->tcount; tt--, i++)
162 {
163 ASN1_VALUE **pseqval;
164 seqtt = asn1_do_adb(pval, tt, 0);
165 if (!seqtt)
166 continue;
167 pseqval = asn1_get_field_ptr(pval, seqtt);
168 ASN1_template_free(pseqval, seqtt);
169 }
170 if (asn1_cb)
171 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
172 if (!combine)
173 {
174 OPENSSL_free(*pval);
175 *pval = NULL;
176 }
177 break;
178 }
179 }
180
ASN1_template_free(ASN1_VALUE ** pval,const ASN1_TEMPLATE * tt)181 void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
182 {
183 size_t i;
184 if (tt->flags & ASN1_TFLG_SK_MASK)
185 {
186 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
187 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++)
188 {
189 ASN1_VALUE *vtmp;
190 vtmp = sk_ASN1_VALUE_value(sk, i);
191 asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item),
192 0);
193 }
194 sk_ASN1_VALUE_free(sk);
195 *pval = NULL;
196 }
197 else
198 asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item),
199 tt->flags & ASN1_TFLG_COMBINE);
200 }
201
ASN1_primitive_free(ASN1_VALUE ** pval,const ASN1_ITEM * it)202 void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
203 {
204 int utype;
205 if (it)
206 {
207 const ASN1_PRIMITIVE_FUNCS *pf;
208 pf = it->funcs;
209 if (pf && pf->prim_free)
210 {
211 pf->prim_free(pval, it);
212 return;
213 }
214 }
215 /* Special case: if 'it' is NULL free contents of ASN1_TYPE */
216 if (!it)
217 {
218 ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
219 utype = typ->type;
220 pval = &typ->value.asn1_value;
221 if (!*pval)
222 return;
223 }
224 else if (it->itype == ASN1_ITYPE_MSTRING)
225 {
226 utype = -1;
227 if (!*pval)
228 return;
229 }
230 else
231 {
232 utype = it->utype;
233 if ((utype != V_ASN1_BOOLEAN) && !*pval)
234 return;
235 }
236
237 switch(utype)
238 {
239 case V_ASN1_OBJECT:
240 ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
241 break;
242
243 case V_ASN1_BOOLEAN:
244 if (it)
245 *(ASN1_BOOLEAN *)pval = it->size;
246 else
247 *(ASN1_BOOLEAN *)pval = -1;
248 return;
249
250 case V_ASN1_NULL:
251 break;
252
253 case V_ASN1_ANY:
254 ASN1_primitive_free(pval, NULL);
255 OPENSSL_free(*pval);
256 break;
257
258 default:
259 ASN1_STRING_free((ASN1_STRING *)*pval);
260 *pval = NULL;
261 break;
262 }
263 *pval = NULL;
264 }
265