1 /* tasn_utl.c */ 2 /* Written by Dr Stephen N Henson (steve (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh (at) 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 } 280
