Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* tasn_utl.c */ |
| 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 | |
| 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 | } |