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- /*
- * Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the Apache License 2.0 (the "License"). You may not use
- * this file except in compliance with the License. You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
- #include <stddef.h>
- #include <string.h>
- #include "internal/cryptlib.h"
- #include "internal/refcount.h"
- #include <openssl/asn1.h>
- #include <openssl/asn1t.h>
- #include <openssl/objects.h>
- #include <openssl/err.h>
- #include "asn1_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;
- }
- int asn1_get_choice_selector_const(const 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 atomic reference counting. The value 'op' decides what to do.
- * If it is +1 then the count is incremented.
- * If |op| is 0, lock is initialised and 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 is active.
- * It returns -1 on initialisation error.
- * Used by ASN1_SEQUENCE construct of X509, X509_REQ, X509_CRL objects
- */
- int asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it)
- {
- const ASN1_AUX *aux;
- CRYPTO_REF_COUNT *lck;
- CRYPTO_RWLOCK **lock;
- int ret = -1;
- if ((it->itype != ASN1_ITYPE_SEQUENCE)
- && (it->itype != ASN1_ITYPE_NDEF_SEQUENCE))
- return 0;
- aux = it->funcs;
- if (aux == NULL || (aux->flags & ASN1_AFLG_REFCOUNT) == 0)
- return 0;
- lck = offset2ptr(*pval, aux->ref_offset);
- lock = offset2ptr(*pval, aux->ref_lock);
- switch (op) {
- case 0:
- *lck = ret = 1;
- *lock = CRYPTO_THREAD_lock_new();
- if (*lock == NULL) {
- ASN1err(ASN1_F_ASN1_DO_LOCK, ERR_R_MALLOC_FAILURE);
- return -1;
- }
- break;
- case 1:
- if (!CRYPTO_UP_REF(lck, &ret, *lock))
- return -1;
- break;
- case -1:
- if (!CRYPTO_DOWN_REF(lck, &ret, *lock))
- return -1; /* failed */
- #ifdef REF_PRINT
- fprintf(stderr, "%p:%4d:%s\n", it, ret, it->sname);
- #endif
- REF_ASSERT_ISNT(ret < 0);
- if (ret == 0) {
- CRYPTO_THREAD_lock_free(*lock);
- *lock = NULL;
- }
- break;
- }
- return ret;
- }
- static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it)
- {
- const ASN1_AUX *aux;
- if (pval == NULL || *pval == NULL)
- return NULL;
- aux = it->funcs;
- if (aux == NULL || (aux->flags & ASN1_AFLG_ENCODING) == 0)
- return NULL;
- return offset2ptr(*pval, aux->enc_offset);
- }
- static const ASN1_ENCODING *asn1_get_const_enc_ptr(const ASN1_VALUE **pval,
- const ASN1_ITEM *it)
- {
- const ASN1_AUX *aux;
- if (pval == NULL || *pval == NULL)
- return NULL;
- aux = it->funcs;
- 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 *enc = asn1_get_enc_ptr(pval, it);
- if (enc != NULL) {
- enc->enc = NULL;
- enc->len = 0;
- enc->modified = 1;
- }
- }
- void asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
- {
- ASN1_ENCODING *enc = asn1_get_enc_ptr(pval, it);
- if (enc != NULL) {
- 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 = asn1_get_enc_ptr(pval, it);
- if (enc == NULL)
- return 1;
- OPENSSL_free(enc->enc);
- if ((enc->enc = OPENSSL_malloc(inlen)) == NULL) {
- ASN1err(ASN1_F_ASN1_ENC_SAVE, ERR_R_MALLOC_FAILURE);
- return 0;
- }
- memcpy(enc->enc, in, inlen);
- enc->len = inlen;
- enc->modified = 0;
- return 1;
- }
- int asn1_enc_restore(int *len, unsigned char **out, const ASN1_VALUE **pval,
- const ASN1_ITEM *it)
- {
- const ASN1_ENCODING *enc = asn1_get_const_enc_ptr(pval, it);
- if (enc == NULL || enc->modified)
- return 0;
- if (out) {
- memcpy(*out, enc->enc, enc->len);
- *out += enc->len;
- }
- if (len != NULL)
- *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 = 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;
- }
- /* Given an ASN1_TEMPLATE get a const pointer to a field */
- const ASN1_VALUE **asn1_get_const_field_ptr(const ASN1_VALUE **pval,
- const ASN1_TEMPLATE *tt)
- {
- return offset2ptr(*pval, tt->offset);
- }
- /*
- * 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(const ASN1_VALUE *val,
- const ASN1_TEMPLATE *tt,
- int nullerr)
- {
- const ASN1_ADB *adb;
- const ASN1_ADB_TABLE *atbl;
- long selector;
- const ASN1_VALUE **sfld;
- int i;
- if ((tt->flags & ASN1_TFLG_ADB_MASK) == 0)
- return tt;
- /* Else ANY DEFINED BY ... get the table */
- adb = ASN1_ADB_ptr(tt->item);
- /* Get the selector field */
- sfld = offset2ptr(val, adb->offset);
- /* Check if NULL */
- if (*sfld == NULL) {
- if (adb->null_tt == NULL)
- 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) != 0)
- selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld);
- else
- selector = ASN1_INTEGER_get((ASN1_INTEGER *)*sfld);
- /* Let application callback translate value */
- if (adb->adb_cb != NULL && adb->adb_cb(&selector) == 0) {
- ASN1err(ASN1_F_ASN1_DO_ADB, ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE);
- return NULL;
- }
- /*
- * 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;
- }
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