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9d6b1ce6 | 1 | /* tasn_utl.c */ |
2e597528 | 2 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
9d6b1ce6 DSH |
3 | * project 2000. |
4 | */ | |
5 | /* ==================================================================== | |
f3f52d7f | 6 | * Copyright (c) 2000-2004 The OpenSSL Project. All rights reserved. |
9d6b1ce6 DSH |
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> | |
3ebac273 | 61 | #include <string.h> |
9d6b1ce6 DSH |
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) | |
f3f52d7f | 77 | { |
9d6b1ce6 DSH |
78 | int *sel = offset2ptr(*pval, it->utype); |
79 | return *sel; | |
f3f52d7f | 80 | } |
9d6b1ce6 DSH |
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) | |
f3f52d7f | 87 | { |
9d6b1ce6 DSH |
88 | int *sel, ret; |
89 | sel = offset2ptr(*pval, it->utype); | |
90 | ret = *sel; | |
91 | *sel = value; | |
92 | return ret; | |
f3f52d7f | 93 | } |
9d6b1ce6 DSH |
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 | |
478b50cf | 98 | * is the current reference count or 0 if no reference count exists. |
9d6b1ce6 DSH |
99 | */ |
100 | ||
101 | int asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it) | |
f3f52d7f | 102 | { |
9d6b1ce6 DSH |
103 | const ASN1_AUX *aux; |
104 | int *lck, ret; | |
f3f52d7f DSH |
105 | if ((it->itype != ASN1_ITYPE_SEQUENCE) |
106 | && (it->itype != ASN1_ITYPE_NDEF_SEQUENCE)) | |
107 | return 0; | |
9d6b1ce6 | 108 | aux = it->funcs; |
f3f52d7f DSH |
109 | if (!aux || !(aux->flags & ASN1_AFLG_REFCOUNT)) |
110 | return 0; | |
9d6b1ce6 | 111 | lck = offset2ptr(*pval, aux->ref_offset); |
f3f52d7f DSH |
112 | if (op == 0) |
113 | { | |
9d6b1ce6 DSH |
114 | *lck = 1; |
115 | return 1; | |
f3f52d7f | 116 | } |
9d6b1ce6 DSH |
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 | |
f3f52d7f | 122 | if (ret < 0) |
9d6b1ce6 DSH |
123 | fprintf(stderr, "%s, bad reference count\n", it->sname); |
124 | #endif | |
125 | return ret; | |
f3f52d7f | 126 | } |
9d6b1ce6 DSH |
127 | |
128 | static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it) | |
f3f52d7f | 129 | { |
9d6b1ce6 | 130 | const ASN1_AUX *aux; |
f3f52d7f DSH |
131 | if (!pval || !*pval) |
132 | return NULL; | |
9d6b1ce6 | 133 | aux = it->funcs; |
f3f52d7f DSH |
134 | if (!aux || !(aux->flags & ASN1_AFLG_ENCODING)) |
135 | return NULL; | |
9d6b1ce6 | 136 | return offset2ptr(*pval, aux->enc_offset); |
f3f52d7f | 137 | } |
9d6b1ce6 DSH |
138 | |
139 | void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it) | |
f3f52d7f | 140 | { |
9d6b1ce6 DSH |
141 | ASN1_ENCODING *enc; |
142 | enc = asn1_get_enc_ptr(pval, it); | |
f3f52d7f DSH |
143 | if (enc) |
144 | { | |
9d6b1ce6 DSH |
145 | enc->enc = NULL; |
146 | enc->len = 0; | |
147 | enc->modified = 1; | |
f3f52d7f | 148 | } |
9d6b1ce6 | 149 | } |
9d6b1ce6 DSH |
150 | |
151 | void asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it) | |
f3f52d7f | 152 | { |
9d6b1ce6 DSH |
153 | ASN1_ENCODING *enc; |
154 | enc = asn1_get_enc_ptr(pval, it); | |
f3f52d7f DSH |
155 | if (enc) |
156 | { | |
157 | if (enc->enc) | |
158 | OPENSSL_free(enc->enc); | |
9d6b1ce6 DSH |
159 | enc->enc = NULL; |
160 | enc->len = 0; | |
161 | enc->modified = 1; | |
f3f52d7f | 162 | } |
9d6b1ce6 | 163 | } |
9d6b1ce6 | 164 | |
f3f52d7f DSH |
165 | int asn1_enc_save(ASN1_VALUE **pval, const unsigned char *in, int inlen, |
166 | const ASN1_ITEM *it) | |
167 | { | |
9d6b1ce6 DSH |
168 | ASN1_ENCODING *enc; |
169 | enc = asn1_get_enc_ptr(pval, it); | |
f3f52d7f DSH |
170 | if (!enc) |
171 | return 1; | |
9d6b1ce6 | 172 | |
f3f52d7f DSH |
173 | if (enc->enc) |
174 | OPENSSL_free(enc->enc); | |
9d6b1ce6 | 175 | enc->enc = OPENSSL_malloc(inlen); |
f3f52d7f DSH |
176 | if (!enc->enc) |
177 | return 0; | |
9d6b1ce6 DSH |
178 | memcpy(enc->enc, in, inlen); |
179 | enc->len = inlen; | |
180 | enc->modified = 0; | |
181 | ||
182 | return 1; | |
f3f52d7f | 183 | } |
9d6b1ce6 | 184 | |
f3f52d7f DSH |
185 | int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval, |
186 | const ASN1_ITEM *it) | |
187 | { | |
9d6b1ce6 DSH |
188 | ASN1_ENCODING *enc; |
189 | enc = asn1_get_enc_ptr(pval, it); | |
f3f52d7f DSH |
190 | if (!enc || enc->modified) |
191 | return 0; | |
192 | if (out) | |
193 | { | |
9d6b1ce6 DSH |
194 | memcpy(*out, enc->enc, enc->len); |
195 | *out += enc->len; | |
f3f52d7f DSH |
196 | } |
197 | if (len) | |
198 | *len = enc->len; | |
9d6b1ce6 | 199 | return 1; |
f3f52d7f | 200 | } |
9d6b1ce6 DSH |
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) | |
f3f52d7f | 204 | { |
9d6b1ce6 | 205 | ASN1_VALUE **pvaltmp; |
f3f52d7f DSH |
206 | if (tt->flags & ASN1_TFLG_COMBINE) |
207 | return pval; | |
9d6b1ce6 DSH |
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; | |
f3f52d7f | 214 | } |
9d6b1ce6 DSH |
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 | ||
f3f52d7f DSH |
220 | const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt, |
221 | int nullerr) | |
222 | { | |
9d6b1ce6 DSH |
223 | const ASN1_ADB *adb; |
224 | const ASN1_ADB_TABLE *atbl; | |
225 | long selector; | |
226 | ASN1_VALUE **sfld; | |
227 | int i; | |
f3f52d7f DSH |
228 | if (!(tt->flags & ASN1_TFLG_ADB_MASK)) |
229 | return tt; | |
9d6b1ce6 DSH |
230 | |
231 | /* Else ANY DEFINED BY ... get the table */ | |
bb5ea36b | 232 | adb = ASN1_ADB_ptr(tt->item); |
9d6b1ce6 DSH |
233 | |
234 | /* Get the selector field */ | |
235 | sfld = offset2ptr(*pval, adb->offset); | |
236 | ||
237 | /* Check if NULL */ | |
f3f52d7f DSH |
238 | if (!sfld) |
239 | { | |
240 | if (!adb->null_tt) | |
241 | goto err; | |
9d6b1ce6 | 242 | return adb->null_tt; |
f3f52d7f | 243 | } |
9d6b1ce6 DSH |
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 | */ | |
f3f52d7f | 249 | if (tt->flags & ASN1_TFLG_ADB_OID) |
9d6b1ce6 DSH |
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 | ||
f3f52d7f DSH |
262 | for (atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++) |
263 | if (atbl->value == selector) | |
264 | return &atbl->tt; | |
9d6b1ce6 DSH |
265 | |
266 | /* FIXME: need to search application table too */ | |
267 | ||
268 | /* No match, return default type */ | |
f3f52d7f DSH |
269 | if (!adb->default_tt) |
270 | goto err; | |
9d6b1ce6 DSH |
271 | return adb->default_tt; |
272 | ||
273 | err: | |
274 | /* FIXME: should log the value or OID of unsupported type */ | |
f3f52d7f DSH |
275 | if (nullerr) |
276 | ASN1err(ASN1_F_ASN1_DO_ADB, | |
277 | ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE); | |
9d6b1ce6 | 278 | return NULL; |
f3f52d7f | 279 | } |