Line data Source code
1 : /* tasn_utl.c */
2 : /*
3 : * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 : * 2000.
5 : */
6 : /* ====================================================================
7 : * Copyright (c) 2000-2004 The OpenSSL Project. All rights reserved.
8 : *
9 : * Redistribution and use in source and binary forms, with or without
10 : * modification, are permitted provided that the following conditions
11 : * are met:
12 : *
13 : * 1. Redistributions of source code must retain the above copyright
14 : * notice, this list of conditions and the following disclaimer.
15 : *
16 : * 2. Redistributions in binary form must reproduce the above copyright
17 : * notice, this list of conditions and the following disclaimer in
18 : * the documentation and/or other materials provided with the
19 : * distribution.
20 : *
21 : * 3. All advertising materials mentioning features or use of this
22 : * software must display the following acknowledgment:
23 : * "This product includes software developed by the OpenSSL Project
24 : * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 : *
26 : * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 : * endorse or promote products derived from this software without
28 : * prior written permission. For written permission, please contact
29 : * licensing@OpenSSL.org.
30 : *
31 : * 5. Products derived from this software may not be called "OpenSSL"
32 : * nor may "OpenSSL" appear in their names without prior written
33 : * permission of the OpenSSL Project.
34 : *
35 : * 6. Redistributions of any form whatsoever must retain the following
36 : * acknowledgment:
37 : * "This product includes software developed by the OpenSSL Project
38 : * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 : *
40 : * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 : * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 : * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 : * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 : * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 : * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 : * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 : * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 : * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 : * OF THE POSSIBILITY OF SUCH DAMAGE.
52 : * ====================================================================
53 : *
54 : * This product includes cryptographic software written by Eric Young
55 : * (eay@cryptsoft.com). This product includes software written by Tim
56 : * Hudson (tjh@cryptsoft.com).
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 : /*
73 : * Given an ASN1_ITEM CHOICE type return the selector value
74 : */
75 :
76 6040 : int asn1_get_choice_selector(ASN1_VALUE **pval, const ASN1_ITEM *it)
77 : {
78 6040 : int *sel = offset2ptr(*pval, it->utype);
79 6040 : return *sel;
80 : }
81 :
82 : /*
83 : * Given an ASN1_ITEM CHOICE type set the selector value, return old value.
84 : */
85 :
86 12080 : int asn1_set_choice_selector(ASN1_VALUE **pval, int value,
87 : const ASN1_ITEM *it)
88 : {
89 : int *sel, ret;
90 12080 : sel = offset2ptr(*pval, it->utype);
91 12080 : ret = *sel;
92 12080 : *sel = value;
93 12080 : return ret;
94 : }
95 :
96 : /*
97 : * Do reference counting. The value 'op' decides what to do. if it is +1
98 : * then the count is incremented. If op is 0 count is set to 1. If op is -1
99 : * count is decremented and the return value is the current refrence count or
100 : * 0 if no reference count exists.
101 : */
102 :
103 97681 : int asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it)
104 : {
105 : const ASN1_AUX *aux;
106 : int *lck, ret;
107 195362 : if ((it->itype != ASN1_ITYPE_SEQUENCE)
108 97681 : && (it->itype != ASN1_ITYPE_NDEF_SEQUENCE))
109 : return 0;
110 97681 : aux = it->funcs;
111 97681 : if (!aux || !(aux->flags & ASN1_AFLG_REFCOUNT))
112 : return 0;
113 6829 : lck = offset2ptr(*pval, aux->ref_offset);
114 6829 : if (op == 0) {
115 1681 : *lck = 1;
116 1681 : return 1;
117 : }
118 5148 : ret = CRYPTO_add(lck, op, aux->ref_lock);
119 : #ifdef REF_PRINT
120 : fprintf(stderr, "%s: Reference Count: %d\n", it->sname, *lck);
121 : #endif
122 : #ifdef REF_CHECK
123 : if (ret < 0)
124 : fprintf(stderr, "%s, bad reference count\n", it->sname);
125 : #endif
126 5148 : return ret;
127 : }
128 :
129 : static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it)
130 : {
131 : const ASN1_AUX *aux;
132 189951 : if (!pval || !*pval)
133 : return NULL;
134 189951 : aux = it->funcs;
135 189951 : if (!aux || !(aux->flags & ASN1_AFLG_ENCODING))
136 : return NULL;
137 10013 : return offset2ptr(*pval, aux->enc_offset);
138 : }
139 :
140 47110 : void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it)
141 : {
142 : ASN1_ENCODING *enc;
143 : enc = asn1_get_enc_ptr(pval, it);
144 47110 : if (enc) {
145 1681 : enc->enc = NULL;
146 1681 : enc->len = 0;
147 1681 : enc->modified = 1;
148 : }
149 47110 : }
150 :
151 47108 : 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 47108 : if (enc) {
156 1681 : if (enc->enc)
157 1681 : OPENSSL_free(enc->enc);
158 1681 : enc->enc = NULL;
159 1681 : enc->len = 0;
160 1681 : enc->modified = 1;
161 : }
162 47108 : }
163 :
164 34007 : int asn1_enc_save(ASN1_VALUE **pval, const unsigned char *in, int inlen,
165 : const ASN1_ITEM *it)
166 : {
167 : ASN1_ENCODING *enc;
168 : enc = asn1_get_enc_ptr(pval, it);
169 34007 : if (!enc)
170 : return 1;
171 :
172 1681 : if (enc->enc)
173 0 : OPENSSL_free(enc->enc);
174 1681 : enc->enc = OPENSSL_malloc(inlen);
175 1681 : if (!enc->enc)
176 : return 0;
177 1681 : memcpy(enc->enc, in, inlen);
178 1681 : enc->len = inlen;
179 1681 : enc->modified = 0;
180 :
181 1681 : return 1;
182 : }
183 :
184 61726 : int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval,
185 : const ASN1_ITEM *it)
186 : {
187 : ASN1_ENCODING *enc;
188 : enc = asn1_get_enc_ptr(pval, it);
189 61726 : if (!enc || enc->modified)
190 : return 0;
191 4970 : if (out) {
192 1780 : memcpy(*out, enc->enc, enc->len);
193 1780 : *out += enc->len;
194 : }
195 4970 : if (len)
196 4970 : *len = enc->len;
197 : return 1;
198 : }
199 :
200 : /* Given an ASN1_TEMPLATE get a pointer to a field */
201 506392 : ASN1_VALUE **asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
202 : {
203 : ASN1_VALUE **pvaltmp;
204 506392 : if (tt->flags & ASN1_TFLG_COMBINE)
205 : return pval;
206 506392 : pvaltmp = offset2ptr(*pval, tt->offset);
207 : /*
208 : * NOTE for BOOLEAN types the field is just a plain int so we can't
209 : * return int **, so settle for (int *).
210 : */
211 506392 : return pvaltmp;
212 : }
213 :
214 : /*
215 : * Handle ANY DEFINED BY template, find the selector, look up the relevant
216 : * ASN1_TEMPLATE in the table and return it.
217 : */
218 :
219 361574 : const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt,
220 : int nullerr)
221 : {
222 : const ASN1_ADB *adb;
223 : const ASN1_ADB_TABLE *atbl;
224 : long selector;
225 : ASN1_VALUE **sfld;
226 : int i;
227 361574 : if (!(tt->flags & ASN1_TFLG_ADB_MASK))
228 : return tt;
229 :
230 : /* Else ANY DEFINED BY ... get the table */
231 0 : adb = ASN1_ADB_ptr(tt->item);
232 :
233 : /* Get the selector field */
234 0 : sfld = offset2ptr(*pval, adb->offset);
235 :
236 : /* Check if NULL */
237 0 : if (!sfld) {
238 0 : if (!adb->null_tt)
239 : goto err;
240 : return adb->null_tt;
241 : }
242 :
243 : /*
244 : * Convert type to a long: NB: don't check for NID_undef here because it
245 : * might be a legitimate value in the table
246 : */
247 0 : if (tt->flags & ASN1_TFLG_ADB_OID)
248 0 : selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld);
249 : else
250 0 : selector = ASN1_INTEGER_get((ASN1_INTEGER *)*sfld);
251 :
252 : /*
253 : * Try to find matching entry in table Maybe should check application
254 : * types first to allow application override? Might also be useful to
255 : * have a flag which indicates table is sorted and we can do a binary
256 : * search. For now stick to a linear search.
257 : */
258 :
259 0 : for (atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++)
260 0 : if (atbl->value == selector)
261 0 : return &atbl->tt;
262 :
263 : /* FIXME: need to search application table too */
264 :
265 : /* No match, return default type */
266 0 : if (!adb->default_tt)
267 : goto err;
268 : return adb->default_tt;
269 :
270 : err:
271 : /* FIXME: should log the value or OID of unsupported type */
272 0 : if (nullerr)
273 0 : ASN1err(ASN1_F_ASN1_DO_ADB, ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE);
274 : return NULL;
275 : }
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