1 /* tasn_utl.c */ 2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL 3 * project 2000. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 2000 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) return 0; 106 aux = it->funcs; 107 if(!aux || !(aux->flags & ASN1_AFLG_REFCOUNT)) return 0; 108 lck = offset2ptr(*pval, aux->ref_offset); 109 if(op == 0) { 110 *lck = 1; 111 return 1; 112 } 113 ret = CRYPTO_add(lck, op, aux->ref_lock); 114 #ifdef REF_PRINT 115 fprintf(stderr, "%s: Reference Count: %d\n", it->sname, *lck); 116 #endif 117 #ifdef REF_CHECK 118 if(ret < 0) 119 fprintf(stderr, "%s, bad reference count\n", it->sname); 120 #endif 121 return ret; 122 } 123 124 static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it) 125 { 126 const ASN1_AUX *aux; 127 if(!pval || !*pval) return NULL; 128 aux = it->funcs; 129 if(!aux || !(aux->flags & ASN1_AFLG_ENCODING)) return NULL; 130 return offset2ptr(*pval, aux->enc_offset); 131 } 132 133 void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it) 134 { 135 ASN1_ENCODING *enc; 136 enc = asn1_get_enc_ptr(pval, it); 137 if(enc) { 138 enc->enc = NULL; 139 enc->len = 0; 140 enc->modified = 1; 141 } 142 } 143 144 void asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 145 { 146 ASN1_ENCODING *enc; 147 enc = asn1_get_enc_ptr(pval, it); 148 if(enc) { 149 if(enc->enc) OPENSSL_free(enc->enc); 150 enc->enc = NULL; 151 enc->len = 0; 152 enc->modified = 1; 153 } 154 } 155 156 int asn1_enc_save(ASN1_VALUE **pval, unsigned char *in, int inlen, const ASN1_ITEM *it) 157 { 158 ASN1_ENCODING *enc; 159 enc = asn1_get_enc_ptr(pval, it); 160 if(!enc) return 1; 161 162 if(enc->enc) OPENSSL_free(enc->enc); 163 enc->enc = OPENSSL_malloc(inlen); 164 if(!enc->enc) return 0; 165 memcpy(enc->enc, in, inlen); 166 enc->len = inlen; 167 enc->modified = 0; 168 169 return 1; 170 } 171 172 int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval, const ASN1_ITEM *it) 173 { 174 ASN1_ENCODING *enc; 175 enc = asn1_get_enc_ptr(pval, it); 176 if(!enc || enc->modified) return 0; 177 if(out) { 178 memcpy(*out, enc->enc, enc->len); 179 *out += enc->len; 180 } 181 if(len) *len = enc->len; 182 return 1; 183 } 184 185 /* Given an ASN1_TEMPLATE get a pointer to a field */ 186 ASN1_VALUE ** asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) 187 { 188 ASN1_VALUE **pvaltmp; 189 if(tt->flags & ASN1_TFLG_COMBINE) return pval; 190 pvaltmp = offset2ptr(*pval, tt->offset); 191 /* NOTE for BOOLEAN types the field is just a plain 192 * int so we can't return int **, so settle for 193 * (int *). 194 */ 195 return pvaltmp; 196 } 197 198 /* Handle ANY DEFINED BY template, find the selector, look up 199 * the relevant ASN1_TEMPLATE in the table and return it. 200 */ 201 202 const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt, int nullerr) 203 { 204 const ASN1_ADB *adb; 205 const ASN1_ADB_TABLE *atbl; 206 long selector; 207 ASN1_VALUE **sfld; 208 int i; 209 if(!(tt->flags & ASN1_TFLG_ADB_MASK)) return tt; 210 211 /* Else ANY DEFINED BY ... get the table */ 212 adb = ASN1_ADB_ptr(tt->item); 213 214 /* Get the selector field */ 215 sfld = offset2ptr(*pval, adb->offset); 216 217 /* Check if NULL */ 218 if(!sfld) { 219 if(!adb->null_tt) goto err; 220 return adb->null_tt; 221 } 222 223 /* Convert type to a long: 224 * NB: don't check for NID_undef here because it 225 * might be a legitimate value in the table 226 */ 227 if(tt->flags & ASN1_TFLG_ADB_OID) 228 selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld); 229 else 230 selector = ASN1_INTEGER_get((ASN1_INTEGER *)*sfld); 231 232 /* Try to find matching entry in table 233 * Maybe should check application types first to 234 * allow application override? Might also be useful 235 * to have a flag which indicates table is sorted and 236 * we can do a binary search. For now stick to a 237 * linear search. 238 */ 239 240 for(atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++) 241 if(atbl->value == selector) return &atbl->tt; 242 243 /* FIXME: need to search application table too */ 244 245 /* No match, return default type */ 246 if(!adb->default_tt) goto err; 247 return adb->default_tt; 248 249 err: 250 /* FIXME: should log the value or OID of unsupported type */ 251 if(nullerr) ASN1err(ASN1_F_ASN1_DO_ADB, ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE); 252 return NULL; 253 } 254