tasn_utl.c revision 280304
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 76int 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/* 83 * Given an ASN1_ITEM CHOICE type set the selector value, return old value. 84 */ 85 86int asn1_set_choice_selector(ASN1_VALUE **pval, int value, 87 const ASN1_ITEM *it) 88{ 89 int *sel, ret; 90 sel = offset2ptr(*pval, it->utype); 91 ret = *sel; 92 *sel = value; 93 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 103int asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it) 104{ 105 const ASN1_AUX *aux; 106 int *lck, ret; 107 if ((it->itype != ASN1_ITYPE_SEQUENCE) 108 && (it->itype != ASN1_ITYPE_NDEF_SEQUENCE)) 109 return 0; 110 aux = it->funcs; 111 if (!aux || !(aux->flags & ASN1_AFLG_REFCOUNT)) 112 return 0; 113 lck = offset2ptr(*pval, aux->ref_offset); 114 if (op == 0) { 115 *lck = 1; 116 return 1; 117 } 118 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 return ret; 127} 128 129static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it) 130{ 131 const ASN1_AUX *aux; 132 if (!pval || !*pval) 133 return NULL; 134 aux = it->funcs; 135 if (!aux || !(aux->flags & ASN1_AFLG_ENCODING)) 136 return NULL; 137 return offset2ptr(*pval, aux->enc_offset); 138} 139 140void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it) 141{ 142 ASN1_ENCODING *enc; 143 enc = asn1_get_enc_ptr(pval, it); 144 if (enc) { 145 enc->enc = NULL; 146 enc->len = 0; 147 enc->modified = 1; 148 } 149} 150 151void 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 if (enc->enc) 157 OPENSSL_free(enc->enc); 158 enc->enc = NULL; 159 enc->len = 0; 160 enc->modified = 1; 161 } 162} 163 164int 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 if (!enc) 170 return 1; 171 172 if (enc->enc) 173 OPENSSL_free(enc->enc); 174 enc->enc = OPENSSL_malloc(inlen); 175 if (!enc->enc) 176 return 0; 177 memcpy(enc->enc, in, inlen); 178 enc->len = inlen; 179 enc->modified = 0; 180 181 return 1; 182} 183 184int 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 if (!enc || enc->modified) 190 return 0; 191 if (out) { 192 memcpy(*out, enc->enc, enc->len); 193 *out += enc->len; 194 } 195 if (len) 196 *len = enc->len; 197 return 1; 198} 199 200/* Given an ASN1_TEMPLATE get a pointer to a field */ 201ASN1_VALUE **asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) 202{ 203 ASN1_VALUE **pvaltmp; 204 if (tt->flags & ASN1_TFLG_COMBINE) 205 return pval; 206 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 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 219const 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 if (!(tt->flags & ASN1_TFLG_ADB_MASK)) 228 return tt; 229 230 /* Else ANY DEFINED BY ... get the table */ 231 adb = ASN1_ADB_ptr(tt->item); 232 233 /* Get the selector field */ 234 sfld = offset2ptr(*pval, adb->offset); 235 236 /* Check if NULL */ 237 if (!sfld) { 238 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 if (tt->flags & ASN1_TFLG_ADB_OID) 248 selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld); 249 else 250 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 for (atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++) 260 if (atbl->value == selector) 261 return &atbl->tt; 262 263 /* FIXME: need to search application table too */ 264 265 /* No match, return default type */ 266 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 if (nullerr) 273 ASN1err(ASN1_F_ASN1_DO_ADB, ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE); 274 return NULL; 275} 276