/* $OpenBSD: tasn_utl.c,v 1.19 2025/05/10 05:54:38 tb Exp $ */ /* Written by Dr Stephen N Henson (steve@openssl.org) 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 <limits.h> #include <stddef.h> #include <string.h> #include <openssl/asn1.h> #include <openssl/asn1t.h> #include <openssl/objects.h> #include "bytestring.h" #include "err_local.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 reference 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); return ret; } static ASN1_ENCODING * asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it) { const ASN1_AUX *aux = it->funcs; if (pval == NULL || *pval == NULL) return NULL; if (aux == NULL || (aux->flags & ASN1_AFLG_ENCODING) == 0) return NULL; return offset2ptr(*pval, aux->enc_offset); } void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it) { ASN1_ENCODING *aenc; if ((aenc = asn1_get_enc_ptr(pval, it)) == NULL) return; aenc->enc = NULL; aenc->len = 0; aenc->modified = 1; } static void asn1_enc_clear(ASN1_ENCODING *aenc) { freezero(aenc->enc, aenc->len); aenc->enc = NULL; aenc->len = 0; aenc->modified = 1; } void asn1_enc_cleanup(ASN1_VALUE **pval, const ASN1_ITEM *it) { ASN1_ENCODING *aenc; if ((aenc = asn1_get_enc_ptr(pval, it)) == NULL) return; asn1_enc_clear(aenc); } int asn1_enc_save(ASN1_VALUE **pval, CBS *cbs, const ASN1_ITEM *it) { ASN1_ENCODING *aenc; uint8_t *data = NULL; size_t data_len = 0; if ((aenc = asn1_get_enc_ptr(pval, it)) == NULL) return 1; asn1_enc_clear(aenc); if (!CBS_stow(cbs, &data, &data_len)) return 0; if (data_len > LONG_MAX) { freezero(data, data_len); return 0; } aenc->enc = data; aenc->len = (long)data_len; aenc->modified = 0; return 1; } int asn1_enc_restore(int *out_len, unsigned char **out, ASN1_VALUE **pval, const ASN1_ITEM *it) { ASN1_ENCODING *aenc; if ((aenc = asn1_get_enc_ptr(pval, it)) == NULL) return 0; if (aenc->modified) return 0; if (out != NULL) { memcpy(*out, aenc->enc, aenc->len); *out += aenc->len; } if (out_len != NULL) *out_len = aenc->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; 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 = (const ASN1_ADB *)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) ASN1error(ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE); return NULL; }
