1 /* $OpenBSD: tasn_utl.c,v 1.10 2014/06/12 15:49:27 deraadt Exp $ */ 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 #include <stddef.h> 60 #include <string.h> 61 #include <openssl/asn1.h> 62 #include <openssl/asn1t.h> 63 #include <openssl/objects.h> 64 #include <openssl/err.h> 65 66 /* Utility functions for manipulating fields and offsets */ 67 68 /* Add 'offset' to 'addr' */ 69 #define offset2ptr(addr, offset) (void *)(((char *) addr) + offset) 70 71 /* Given an ASN1_ITEM CHOICE type return 72 * the selector value 73 */ 74 75 int 76 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 87 asn1_set_choice_selector(ASN1_VALUE **pval, int value, 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 /* Do reference counting. The value 'op' decides what to do. 97 * if it is +1 then the count is incremented. If op is 0 count is 98 * set to 1. If op is -1 count is decremented and the return value 99 * is the current refrence count or 0 if no reference count exists. 100 */ 101 102 int 103 asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it) 104 { 105 const ASN1_AUX *aux; 106 int *lck, ret; 107 108 if ((it->itype != ASN1_ITYPE_SEQUENCE) && 109 (it->itype != ASN1_ITYPE_NDEF_SEQUENCE)) 110 return 0; 111 aux = it->funcs; 112 if (!aux || !(aux->flags & ASN1_AFLG_REFCOUNT)) 113 return 0; 114 lck = offset2ptr(*pval, aux->ref_offset); 115 if (op == 0) { 116 *lck = 1; 117 return 1; 118 } 119 ret = CRYPTO_add(lck, op, aux->ref_lock); 120 return ret; 121 } 122 123 static ASN1_ENCODING * 124 asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it) 125 { 126 const ASN1_AUX *aux; 127 128 if (!pval || !*pval) 129 return NULL; 130 aux = it->funcs; 131 if (!aux || !(aux->flags & ASN1_AFLG_ENCODING)) 132 return NULL; 133 return offset2ptr(*pval, aux->enc_offset); 134 } 135 136 void 137 asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it) 138 { 139 ASN1_ENCODING *enc; 140 141 enc = asn1_get_enc_ptr(pval, it); 142 if (enc) { 143 enc->enc = NULL; 144 enc->len = 0; 145 enc->modified = 1; 146 } 147 } 148 149 void 150 asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 151 { 152 ASN1_ENCODING *enc; 153 154 enc = asn1_get_enc_ptr(pval, it); 155 if (enc) { 156 free(enc->enc); 157 enc->enc = NULL; 158 enc->len = 0; 159 enc->modified = 1; 160 } 161 } 162 163 int 164 asn1_enc_save(ASN1_VALUE **pval, const unsigned char *in, int inlen, 165 const ASN1_ITEM *it) 166 { 167 ASN1_ENCODING *enc; 168 169 enc = asn1_get_enc_ptr(pval, it); 170 if (!enc) 171 return 1; 172 173 free(enc->enc); 174 enc->enc = 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 } 183 184 int 185 asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval, 186 const ASN1_ITEM *it) 187 { 188 ASN1_ENCODING *enc; 189 190 enc = asn1_get_enc_ptr(pval, it); 191 if (!enc || enc->modified) 192 return 0; 193 if (out) { 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 ** 204 asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) 205 { 206 ASN1_VALUE **pvaltmp; 207 208 if (tt->flags & ASN1_TFLG_COMBINE) 209 return pval; 210 pvaltmp = offset2ptr(*pval, tt->offset); 211 /* NOTE for BOOLEAN types the field is just a plain 212 * int so we can't return int **, so settle for 213 * (int *). 214 */ 215 return pvaltmp; 216 } 217 218 /* Handle ANY DEFINED BY template, find the selector, look up 219 * the relevant ASN1_TEMPLATE in the table and return it. 220 */ 221 222 const ASN1_TEMPLATE * 223 asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt, int nullerr) 224 { 225 const ASN1_ADB *adb; 226 const ASN1_ADB_TABLE *atbl; 227 long selector; 228 ASN1_VALUE **sfld; 229 int i; 230 231 if (!(tt->flags & ASN1_TFLG_ADB_MASK)) 232 return tt; 233 234 /* Else ANY DEFINED BY ... get the table */ 235 adb = (const ASN1_ADB *)tt->item; 236 237 /* Get the selector field */ 238 sfld = offset2ptr(*pval, adb->offset); 239 240 /* Check if NULL */ 241 if (!sfld) { 242 if (!adb->null_tt) 243 goto err; 244 return adb->null_tt; 245 } 246 247 /* Convert type to a long: 248 * NB: don't check for NID_undef here because it 249 * might be a legitimate value in the table 250 */ 251 if (tt->flags & ASN1_TFLG_ADB_OID) 252 selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld); 253 else 254 selector = ASN1_INTEGER_get((ASN1_INTEGER *)*sfld); 255 256 /* Try to find matching entry in table 257 * Maybe should check application types first to 258 * allow application override? Might also be useful 259 * to have a flag which indicates table is sorted and 260 * we can do a binary search. For now stick to a 261 * linear search. 262 */ 263 264 for (atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++) 265 if (atbl->value == selector) 266 return &atbl->tt; 267 268 /* FIXME: need to search application table too */ 269 270 /* No match, return default type */ 271 if (!adb->default_tt) 272 goto err; 273 return adb->default_tt; 274 275 err: 276 /* FIXME: should log the value or OID of unsupported type */ 277 if (nullerr) 278 ASN1err(ASN1_F_ASN1_DO_ADB, 279 ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE); 280 return NULL; 281 } 282