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Diffstat (limited to 'crypto/asn1/tasn_utl.c')
-rw-r--r-- | crypto/asn1/tasn_utl.c | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/crypto/asn1/tasn_utl.c b/crypto/asn1/tasn_utl.c new file mode 100644 index 0000000..34d520b --- /dev/null +++ b/crypto/asn1/tasn_utl.c @@ -0,0 +1,279 @@ +/* tasn_utl.c */ +/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL + * project 2000. + */ +/* ==================================================================== + * Copyright (c) 2000-2004 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * licensing@OpenSSL.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). + * + */ + + +#include <stddef.h> +#include <string.h> +#include <openssl/asn1.h> +#include <openssl/asn1t.h> +#include <openssl/objects.h> +#include <openssl/err.h> + +/* Utility functions for manipulating fields and offsets */ + +/* Add 'offset' to 'addr' */ +#define offset2ptr(addr, offset) (void *)(((char *) addr) + offset) + +/* Given an ASN1_ITEM CHOICE type return + * the selector value + */ + +int asn1_get_choice_selector(ASN1_VALUE **pval, const ASN1_ITEM *it) + { + int *sel = offset2ptr(*pval, it->utype); + return *sel; + } + +/* Given an ASN1_ITEM CHOICE type set + * the selector value, return old value. + */ + +int asn1_set_choice_selector(ASN1_VALUE **pval, int value, const ASN1_ITEM *it) + { + int *sel, ret; + sel = offset2ptr(*pval, it->utype); + ret = *sel; + *sel = value; + return ret; + } + +/* Do reference counting. The value 'op' decides what to do. + * if it is +1 then the count is incremented. If op is 0 count is + * set to 1. If op is -1 count is decremented and the return value + * is the current refrence count or 0 if no reference count exists. + */ + +int asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it) + { + const ASN1_AUX *aux; + int *lck, ret; + if ((it->itype != ASN1_ITYPE_SEQUENCE) + && (it->itype != ASN1_ITYPE_NDEF_SEQUENCE)) + return 0; + aux = it->funcs; + if (!aux || !(aux->flags & ASN1_AFLG_REFCOUNT)) + return 0; + lck = offset2ptr(*pval, aux->ref_offset); + if (op == 0) + { + *lck = 1; + return 1; + } + ret = CRYPTO_add(lck, op, aux->ref_lock); +#ifdef REF_PRINT + fprintf(stderr, "%s: Reference Count: %d\n", it->sname, *lck); +#endif +#ifdef REF_CHECK + if (ret < 0) + fprintf(stderr, "%s, bad reference count\n", it->sname); +#endif + return ret; + } + +static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it) + { + const ASN1_AUX *aux; + if (!pval || !*pval) + return NULL; + aux = it->funcs; + if (!aux || !(aux->flags & ASN1_AFLG_ENCODING)) + return NULL; + return offset2ptr(*pval, aux->enc_offset); + } + +void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it) + { + ASN1_ENCODING *enc; + enc = asn1_get_enc_ptr(pval, it); + if (enc) + { + enc->enc = NULL; + enc->len = 0; + enc->modified = 1; + } + } + +void asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it) + { + ASN1_ENCODING *enc; + enc = asn1_get_enc_ptr(pval, it); + if (enc) + { + if (enc->enc) + OPENSSL_free(enc->enc); + enc->enc = NULL; + enc->len = 0; + enc->modified = 1; + } + } + +int asn1_enc_save(ASN1_VALUE **pval, const unsigned char *in, int inlen, + const ASN1_ITEM *it) + { + ASN1_ENCODING *enc; + enc = asn1_get_enc_ptr(pval, it); + if (!enc) + return 1; + + if (enc->enc) + OPENSSL_free(enc->enc); + enc->enc = OPENSSL_malloc(inlen); + if (!enc->enc) + return 0; + memcpy(enc->enc, in, inlen); + enc->len = inlen; + enc->modified = 0; + + return 1; + } + +int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval, + const ASN1_ITEM *it) + { + ASN1_ENCODING *enc; + enc = asn1_get_enc_ptr(pval, it); + if (!enc || enc->modified) + return 0; + if (out) + { + memcpy(*out, enc->enc, enc->len); + *out += enc->len; + } + if (len) + *len = enc->len; + return 1; + } + +/* Given an ASN1_TEMPLATE get a pointer to a field */ +ASN1_VALUE ** asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) + { + ASN1_VALUE **pvaltmp; + if (tt->flags & ASN1_TFLG_COMBINE) + return pval; + pvaltmp = offset2ptr(*pval, tt->offset); + /* NOTE for BOOLEAN types the field is just a plain + * int so we can't return int **, so settle for + * (int *). + */ + return pvaltmp; + } + +/* Handle ANY DEFINED BY template, find the selector, look up + * the relevant ASN1_TEMPLATE in the table and return it. + */ + +const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt, + int nullerr) + { + const ASN1_ADB *adb; + const ASN1_ADB_TABLE *atbl; + long selector; + ASN1_VALUE **sfld; + int i; + if (!(tt->flags & ASN1_TFLG_ADB_MASK)) + return tt; + + /* Else ANY DEFINED BY ... get the table */ + adb = ASN1_ADB_ptr(tt->item); + + /* Get the selector field */ + sfld = offset2ptr(*pval, adb->offset); + + /* Check if NULL */ + if (!sfld) + { + if (!adb->null_tt) + goto err; + return adb->null_tt; + } + + /* Convert type to a long: + * NB: don't check for NID_undef here because it + * might be a legitimate value in the table + */ + if (tt->flags & ASN1_TFLG_ADB_OID) + selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld); + else + selector = ASN1_INTEGER_get((ASN1_INTEGER *)*sfld); + + /* Try to find matching entry in table + * Maybe should check application types first to + * allow application override? Might also be useful + * to have a flag which indicates table is sorted and + * we can do a binary search. For now stick to a + * linear search. + */ + + for (atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++) + if (atbl->value == selector) + return &atbl->tt; + + /* FIXME: need to search application table too */ + + /* No match, return default type */ + if (!adb->default_tt) + goto err; + return adb->default_tt; + + err: + /* FIXME: should log the value or OID of unsupported type */ + if (nullerr) + ASN1err(ASN1_F_ASN1_DO_ADB, + ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE); + return NULL; + } |