1 /* tasn_utl.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 2000.
4 */
5 /* ====================================================================
6 * Copyright (c) 2000-2004 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59
60 #include <stddef.h>
61 #include <string.h>
62 #include <openssl/asn1.h>
63 #include <openssl/asn1t.h>
64 #include <openssl/objects.h>
65 #include <openssl/err.h>
66
67 /* Utility functions for manipulating fields and offsets */
68
69 /* Add 'offset' to 'addr' */
70 #define offset2ptr(addr, offset) (void *)(((char *) addr) + offset)
71
72 /* Given an ASN1_ITEM CHOICE type return
73 * the selector value
74 */
75
76 int asn1_get_choice_selector(ASN1_VALUE **pval, const ASN1_ITEM *it)
77 {
78 int *sel = offset2ptr(*pval, it->utype);
79 return *sel;
80 }
81
82 /* Given an ASN1_ITEM CHOICE type set
83 * the selector value, return old value.
84 */
85
86 int asn1_set_choice_selector(ASN1_VALUE **pval, int value, const ASN1_ITEM *it)
87 {
88 int *sel, ret;
89 sel = offset2ptr(*pval, it->utype);
90 ret = *sel;
91 *sel = value;
92 return ret;
93 }
94
95 /* Do reference counting. The value 'op' decides what to do.
96 * if it is +1 then the count is incremented. If op is 0 count is
97 * set to 1. If op is -1 count is decremented and the return value
98 * is the current refrence count or 0 if no reference count exists.
99 */
100
101 int asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it)
102 {
103 const ASN1_AUX *aux;
104 int *lck, ret;
105 if ((it->itype != ASN1_ITYPE_SEQUENCE)
106 && (it->itype != ASN1_ITYPE_NDEF_SEQUENCE))
107 return 0;
108 aux = it->funcs;
109 if (!aux || !(aux->flags & ASN1_AFLG_REFCOUNT))
110 return 0;
111 lck = offset2ptr(*pval, aux->ref_offset);
112 if (op == 0)
113 {
114 *lck = 1;
115 return 1;
116 }
117 ret = CRYPTO_add(lck, op, aux->ref_lock);
118 #ifdef REF_PRINT
119 fprintf(stderr, "%s: Reference Count: %d\n", it->sname, *lck);
120 #endif
121 #ifdef REF_CHECK
122 if (ret < 0)
123 fprintf(stderr, "%s, bad reference count\n", it->sname);
124 #endif
125 return ret;
126 }
127
128 static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it)
129 {
130 const ASN1_AUX *aux;
131 if (!pval || !*pval)
132 return NULL;
133 aux = it->funcs;
134 if (!aux || !(aux->flags & ASN1_AFLG_ENCODING))
135 return NULL;
136 return offset2ptr(*pval, aux->enc_offset);
137 }
138
139 void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it)
140 {
141 ASN1_ENCODING *enc;
142 enc = asn1_get_enc_ptr(pval, it);
143 if (enc)
144 {
145 enc->enc = NULL;
146 enc->len = 0;
147 enc->modified = 1;
148 }
149 }
150
151 void asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
152 {
153 ASN1_ENCODING *enc;
154 enc = asn1_get_enc_ptr(pval, it);
155 if (enc)
156 {
157 if (enc->enc)
158 OPENSSL_free(enc->enc);
159 enc->enc = NULL;
160 enc->len = 0;
161 enc->modified = 1;
162 }
163 }
164
165 int asn1_enc_save(ASN1_VALUE **pval, const unsigned char *in, int inlen,
166 const ASN1_ITEM *it)
167 {
168 ASN1_ENCODING *enc;
169 enc = asn1_get_enc_ptr(pval, it);
170 if (!enc)
171 return 1;
172
173 if (enc->enc)
174 OPENSSL_free(enc->enc);
175 enc->enc = OPENSSL_malloc(inlen);
176 if (!enc->enc)
177 return 0;
178 memcpy(enc->enc, in, inlen);
179 enc->len = inlen;
180 enc->modified = 0;
181
182 return 1;
183 }
184
185 int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval,
186 const ASN1_ITEM *it)
187 {
188 ASN1_ENCODING *enc;
189 enc = asn1_get_enc_ptr(pval, it);
190 if (!enc || enc->modified)
191 return 0;
192 if (out)
193 {
194 memcpy(*out, enc->enc, enc->len);
195 *out += enc->len;
196 }
197 if (len)
198 *len = enc->len;
199 return 1;
200 }
201
202 /* Given an ASN1_TEMPLATE get a pointer to a field */
203 ASN1_VALUE ** asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
204 {
205 ASN1_VALUE **pvaltmp;
206 if (tt->flags & ASN1_TFLG_COMBINE)
207 return pval;
208 pvaltmp = offset2ptr(*pval, tt->offset);
209 /* NOTE for BOOLEAN types the field is just a plain
210 * int so we can't return int **, so settle for
211 * (int *).
212 */
213 return pvaltmp;
214 }
215
216 /* Handle ANY DEFINED BY template, find the selector, look up
217 * the relevant ASN1_TEMPLATE in the table and return it.
218 */
219
220 const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt,
221 int nullerr)
222 {
223 const ASN1_ADB *adb;
224 const ASN1_ADB_TABLE *atbl;
225 long selector;
226 ASN1_VALUE **sfld;
227 int i;
228 if (!(tt->flags & ASN1_TFLG_ADB_MASK))
229 return tt;
230
231 /* Else ANY DEFINED BY ... get the table */
232 adb = ASN1_ADB_ptr(tt->item);
233
234 /* Get the selector field */
235 sfld = offset2ptr(*pval, adb->offset);
236
237 /* Check if NULL */
238 if (!sfld)
239 {
240 if (!adb->null_tt)
241 goto err;
242 return adb->null_tt;
243 }
244
245 /* Convert type to a long:
246 * NB: don't check for NID_undef here because it
247 * might be a legitimate value in the table
248 */
249 if (tt->flags & ASN1_TFLG_ADB_OID)
250 selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld);
251 else
252 selector = ASN1_INTEGER_get((ASN1_INTEGER *)*sfld);
253
254 /* Try to find matching entry in table
255 * Maybe should check application types first to
256 * allow application override? Might also be useful
257 * to have a flag which indicates table is sorted and
258 * we can do a binary search. For now stick to a
259 * linear search.
260 */
261
262 for (atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++)
263 if (atbl->value == selector)
264 return &atbl->tt;
265
266 /* FIXME: need to search application table too */
267
268 /* No match, return default type */
269 if (!adb->default_tt)
270 goto err;
271 return adb->default_tt;
272
273 err:
274 /* FIXME: should log the value or OID of unsupported type */
275 if (nullerr)
276 ASN1err(ASN1_F_ASN1_DO_ADB,
277 ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE);
278 return NULL;
279 }