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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 } | |
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