1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #include <openssl/asn1.h> 58 59 #include <assert.h> 60 #include <string.h> 61 62 #include <openssl/asn1t.h> 63 #include <openssl/mem.h> 64 #include <openssl/obj.h> 65 #include <openssl/err.h> 66 #include <openssl/thread.h> 67 68 #include "../internal.h" 69 70 71 /* Utility functions for manipulating fields and offsets */ 72 73 /* Add 'offset' to 'addr' */ 74 #define offset2ptr(addr, offset) (void *)(((char *)(addr)) + (offset)) 75 76 /* Given an ASN1_ITEM CHOICE type return the selector value */ 77 int asn1_get_choice_selector(ASN1_VALUE **pval, const ASN1_ITEM *it) { 78 int *sel = offset2ptr(*pval, it->utype); 79 return *sel; 80 } 81 82 /* Given an ASN1_ITEM CHOICE type set the selector value, return old value. */ 83 int asn1_set_choice_selector(ASN1_VALUE **pval, int value, 84 const ASN1_ITEM *it) { 85 int *sel, ret; 86 sel = offset2ptr(*pval, it->utype); 87 ret = *sel; 88 *sel = value; 89 return ret; 90 } 91 92 static CRYPTO_refcount_t *asn1_get_references(ASN1_VALUE **pval, 93 const ASN1_ITEM *it) { 94 if (it->itype != ASN1_ITYPE_SEQUENCE && 95 it->itype != ASN1_ITYPE_NDEF_SEQUENCE) { 96 return NULL; 97 } 98 const ASN1_AUX *aux = it->funcs; 99 if (!aux || !(aux->flags & ASN1_AFLG_REFCOUNT)) { 100 return NULL; 101 } 102 return offset2ptr(*pval, aux->ref_offset); 103 } 104 105 void asn1_refcount_set_one(ASN1_VALUE **pval, const ASN1_ITEM *it) { 106 CRYPTO_refcount_t *references = asn1_get_references(pval, it); 107 if (references != NULL) { 108 *references = 1; 109 } 110 } 111 112 int asn1_refcount_dec_and_test_zero(ASN1_VALUE **pval, const ASN1_ITEM *it) { 113 CRYPTO_refcount_t *references = asn1_get_references(pval, it); 114 if (references != NULL) { 115 return CRYPTO_refcount_dec_and_test_zero(references); 116 } 117 return 1; 118 } 119 120 static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it) { 121 const ASN1_AUX *aux; 122 if (!pval || !*pval) { 123 return NULL; 124 } 125 aux = it->funcs; 126 if (!aux || !(aux->flags & ASN1_AFLG_ENCODING)) { 127 return NULL; 128 } 129 return offset2ptr(*pval, aux->enc_offset); 130 } 131 132 void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it) { 133 ASN1_ENCODING *enc; 134 enc = asn1_get_enc_ptr(pval, it); 135 if (enc) { 136 enc->enc = NULL; 137 enc->len = 0; 138 enc->alias_only = 0; 139 enc->alias_only_on_next_parse = 0; 140 enc->modified = 1; 141 } 142 } 143 144 void asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it) { 145 ASN1_ENCODING *enc; 146 enc = asn1_get_enc_ptr(pval, it); 147 if (enc) { 148 if (enc->enc && !enc->alias_only) { 149 OPENSSL_free(enc->enc); 150 } 151 enc->enc = NULL; 152 enc->len = 0; 153 enc->alias_only = 0; 154 enc->alias_only_on_next_parse = 0; 155 enc->modified = 1; 156 } 157 } 158 159 int asn1_enc_save(ASN1_VALUE **pval, const unsigned char *in, int inlen, 160 const ASN1_ITEM *it) { 161 ASN1_ENCODING *enc; 162 enc = asn1_get_enc_ptr(pval, it); 163 if (!enc) { 164 return 1; 165 } 166 167 if (!enc->alias_only) { 168 OPENSSL_free(enc->enc); 169 } 170 171 enc->alias_only = enc->alias_only_on_next_parse; 172 enc->alias_only_on_next_parse = 0; 173 174 if (enc->alias_only) { 175 enc->enc = (uint8_t *) in; 176 } else { 177 enc->enc = OPENSSL_malloc(inlen); 178 if (!enc->enc) { 179 return 0; 180 } 181 OPENSSL_memcpy(enc->enc, in, inlen); 182 } 183 184 enc->len = inlen; 185 enc->modified = 0; 186 187 return 1; 188 } 189 190 int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval, 191 const ASN1_ITEM *it) { 192 ASN1_ENCODING *enc; 193 enc = asn1_get_enc_ptr(pval, it); 194 if (!enc || enc->modified) { 195 return 0; 196 } 197 if (out) { 198 OPENSSL_memcpy(*out, enc->enc, enc->len); 199 *out += enc->len; 200 } 201 if (len) { 202 *len = enc->len; 203 } 204 return 1; 205 } 206 207 /* Given an ASN1_TEMPLATE get a pointer to a field */ 208 ASN1_VALUE **asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) { 209 ASN1_VALUE **pvaltmp; 210 if (tt->flags & ASN1_TFLG_COMBINE) { 211 return pval; 212 } 213 pvaltmp = offset2ptr(*pval, tt->offset); 214 /* NOTE for BOOLEAN types the field is just a plain int so we can't return 215 * int **, so settle for (int *). */ 216 return pvaltmp; 217 } 218 219 /* Handle ANY DEFINED BY template, find the selector, look up the relevant 220 * ASN1_TEMPLATE in the table and return it. */ 221 const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt, 222 int nullerr) { 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 } 231 232 /* Else ANY DEFINED BY ... get the table */ 233 adb = ASN1_ADB_ptr(tt->item); 234 235 /* Get the selector field */ 236 sfld = offset2ptr(*pval, adb->offset); 237 238 /* Check if NULL */ 239 if (*sfld == NULL) { 240 if (!adb->null_tt) { 241 goto err; 242 } 243 return adb->null_tt; 244 } 245 246 /* Convert type to a long: 247 * NB: don't check for NID_undef here because it 248 * might be a legitimate value in the table */ 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 } 254 255 /* Try to find matching entry in table Maybe should check application types 256 * first to allow application override? Might also be useful to have a flag 257 * which indicates table is sorted and we can do a binary search. For now 258 * stick to a linear search. */ 259 260 for (atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++) { 261 if (atbl->value == selector) { 262 return &atbl->tt; 263 } 264 } 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 } 272 return adb->default_tt; 273 274 err: 275 /* FIXME: should log the value or OID of unsupported type */ 276 if (nullerr) { 277 OPENSSL_PUT_ERROR(ASN1, ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE); 278 } 279 return NULL; 280 } 281
