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 {
70 asn1_item_combine_free(&val, it, 0);
71 }
72
ASN1_item_ex_free(ASN1_VALUE ** pval,const ASN1_ITEM * it)73 void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
74 {
75 asn1_item_combine_free(pval, it, 0);
76 }
77
asn1_item_combine_free(ASN1_VALUE ** pval,const ASN1_ITEM * it,int combine)78 void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine)
79 {
80 const ASN1_TEMPLATE *tt = NULL, *seqtt;
81 const ASN1_EXTERN_FUNCS *ef;
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 case ASN1_ITYPE_PRIMITIVE:
97 if (it->templates)
98 ASN1_template_free(pval, it->templates);
99 else
100 ASN1_primitive_free(pval, it);
101 break;
102
103 case ASN1_ITYPE_MSTRING:
104 ASN1_primitive_free(pval, it);
105 break;
106
107 case ASN1_ITYPE_CHOICE:
108 if (asn1_cb) {
109 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
110 if (i == 2)
111 return;
112 }
113 i = asn1_get_choice_selector(pval, it);
114 if ((i >= 0) && (i < it->tcount)) {
115 ASN1_VALUE **pchval;
116 tt = it->templates + i;
117 pchval = asn1_get_field_ptr(pval, tt);
118 ASN1_template_free(pchval, tt);
119 }
120 if (asn1_cb)
121 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
122 if (!combine) {
123 OPENSSL_free(*pval);
124 *pval = NULL;
125 }
126 break;
127
128 case ASN1_ITYPE_EXTERN:
129 ef = it->funcs;
130 if (ef && ef->asn1_ex_free)
131 ef->asn1_ex_free(pval, it);
132 break;
133
134 case ASN1_ITYPE_SEQUENCE:
135 if (!asn1_refcount_dec_and_test_zero(pval, it))
136 return;
137 if (asn1_cb) {
138 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL);
139 if (i == 2)
140 return;
141 }
142 asn1_enc_free(pval, it);
143 /*
144 * If we free up as normal we will invalidate any ANY DEFINED BY
145 * field and we wont be able to determine the type of the field it
146 * defines. So free up in reverse order.
147 */
148 tt = it->templates + it->tcount - 1;
149 for (i = 0; i < it->tcount; tt--, i++) {
150 ASN1_VALUE **pseqval;
151 seqtt = asn1_do_adb(pval, tt, 0);
152 if (!seqtt)
153 continue;
154 pseqval = asn1_get_field_ptr(pval, seqtt);
155 ASN1_template_free(pseqval, seqtt);
156 }
157 if (asn1_cb)
158 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
159 if (!combine) {
160 OPENSSL_free(*pval);
161 *pval = NULL;
162 }
163 break;
164 }
165 }
166
ASN1_template_free(ASN1_VALUE ** pval,const ASN1_TEMPLATE * tt)167 void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
168 {
169 size_t i;
170 if (tt->flags & ASN1_TFLG_SK_MASK) {
171 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
172 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
173 ASN1_VALUE *vtmp;
174 vtmp = sk_ASN1_VALUE_value(sk, i);
175 asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item), 0);
176 }
177 sk_ASN1_VALUE_free(sk);
178 *pval = NULL;
179 } else
180 asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item),
181 tt->flags & ASN1_TFLG_COMBINE);
182 }
183
ASN1_primitive_free(ASN1_VALUE ** pval,const ASN1_ITEM * it)184 void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
185 {
186 int utype;
187 /* Historically, |it->funcs| for primitive types contained an
188 * |ASN1_PRIMITIVE_FUNCS| table of calbacks. */
189 assert(it == NULL || it->funcs == NULL);
190 /* Special case: if 'it' is NULL free contents of ASN1_TYPE */
191 if (!it) {
192 ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
193 utype = typ->type;
194 pval = &typ->value.asn1_value;
195 if (utype != V_ASN1_BOOLEAN && !*pval)
196 return;
197 } else if (it->itype == ASN1_ITYPE_MSTRING) {
198 utype = -1;
199 if (!*pval)
200 return;
201 } else {
202 utype = it->utype;
203 if ((utype != V_ASN1_BOOLEAN) && !*pval)
204 return;
205 }
206
207 switch (utype) {
208 case V_ASN1_OBJECT:
209 ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
210 break;
211
212 case V_ASN1_BOOLEAN:
213 if (it)
214 *(ASN1_BOOLEAN *)pval = it->size;
215 else
216 *(ASN1_BOOLEAN *)pval = -1;
217 return;
218
219 case V_ASN1_NULL:
220 break;
221
222 case V_ASN1_ANY:
223 ASN1_primitive_free(pval, NULL);
224 OPENSSL_free(*pval);
225 break;
226
227 default:
228 ASN1_STRING_free((ASN1_STRING *)*pval);
229 *pval = NULL;
230 break;
231 }
232 *pval = NULL;
233 }
234