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openssl/crypto/asn1/tasn_new.c
Matt Caswell dea2878fac Teach more of the ASN.1 code about libctx/propq 
Make sure we pass libctx/propq down to all the layers so that objects that
are created during parsing have the right values. Then use this new
capability for PKCS7.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15591)
2021-06-05 17:39:10 +10:00

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/*
* Copyright 2000-2021 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 <openssl/asn1.h>
#include <openssl/objects.h>
#include <openssl/err.h>
#include <openssl/asn1t.h>
#include <string.h>
#include "asn1_local.h"
static int asn1_item_embed_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
int embed, OSSL_LIB_CTX *libctx,
const char *propq);
static int asn1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
int embed);
static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
static int asn1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt,
OSSL_LIB_CTX *libctx, const char *propq);
static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);
static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
ASN1_VALUE *ASN1_item_new(const ASN1_ITEM *it)
{
ASN1_VALUE *ret = NULL;
if (ASN1_item_ex_new(&ret, it) > 0)
return ret;
return NULL;
}
ASN1_VALUE *ASN1_item_new_ex(const ASN1_ITEM *it, OSSL_LIB_CTX *libctx,
const char *propq)
{
ASN1_VALUE *ret = NULL;
if (asn1_item_embed_new(&ret, it, 0, libctx, propq) > 0)
return ret;
return NULL;
}
/* Allocate an ASN1 structure */
int ossl_asn1_item_ex_new_intern(ASN1_VALUE **pval, const ASN1_ITEM *it,
OSSL_LIB_CTX *libctx, const char *propq)
{
return asn1_item_embed_new(pval, it, 0, libctx, propq);
}
int ASN1_item_ex_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
return asn1_item_embed_new(pval, it, 0, NULL, NULL);
}
int asn1_item_embed_new(ASN1_VALUE **pval, const ASN1_ITEM *it, int embed,
OSSL_LIB_CTX *libctx, const char *propq)
{
const ASN1_TEMPLATE *tt = NULL;
const ASN1_EXTERN_FUNCS *ef;
const ASN1_AUX *aux = it->funcs;
ASN1_aux_cb *asn1_cb;
ASN1_VALUE **pseqval;
int i;
if (aux && aux->asn1_cb)
asn1_cb = aux->asn1_cb;
else
asn1_cb = 0;
switch (it->itype) {
case ASN1_ITYPE_EXTERN:
ef = it->funcs;
if (ef != NULL) {
if (ef->asn1_ex_new_ex != NULL) {
if (!ef->asn1_ex_new_ex(pval, it, libctx, propq))
goto memerr;
} else if (ef->asn1_ex_new != NULL) {
if (!ef->asn1_ex_new(pval, it))
goto memerr;
}
}
break;
case ASN1_ITYPE_PRIMITIVE:
if (it->templates) {
if (!asn1_template_new(pval, it->templates, libctx, propq))
goto memerr;
} else if (!asn1_primitive_new(pval, it, embed))
goto memerr;
break;
case ASN1_ITYPE_MSTRING:
if (!asn1_primitive_new(pval, it, embed))
goto memerr;
break;
case ASN1_ITYPE_CHOICE:
if (asn1_cb) {
i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);
if (!i)
goto auxerr;
if (i == 2) {
return 1;
}
}
if (embed) {
memset(*pval, 0, it->size);
} else {
*pval = OPENSSL_zalloc(it->size);
if (*pval == NULL)
goto memerr;
}
ossl_asn1_set_choice_selector(pval, -1, it);
if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
goto auxerr2;
break;
case ASN1_ITYPE_NDEF_SEQUENCE:
case ASN1_ITYPE_SEQUENCE:
if (asn1_cb) {
i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);
if (!i)
goto auxerr;
if (i == 2) {
return 1;
}
}
if (embed) {
memset(*pval, 0, it->size);
} else {
*pval = OPENSSL_zalloc(it->size);
if (*pval == NULL)
goto memerr;
}
/* 0 : init. lock */
if (ossl_asn1_do_lock(pval, 0, it) < 0) {
if (!embed) {
OPENSSL_free(*pval);
*pval = NULL;
}
goto memerr;
}
ossl_asn1_enc_init(pval, it);
for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
pseqval = ossl_asn1_get_field_ptr(pval, tt);
if (!asn1_template_new(pseqval, tt, libctx, propq))
goto memerr2;
}
if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
goto auxerr2;
break;
}
return 1;
memerr2:
ossl_asn1_item_embed_free(pval, it, embed);
memerr:
ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
return 0;
auxerr2:
ossl_asn1_item_embed_free(pval, it, embed);
auxerr:
ERR_raise(ERR_LIB_ASN1, ASN1_R_AUX_ERROR);
return 0;
}
static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
const ASN1_EXTERN_FUNCS *ef;
switch (it->itype) {
case ASN1_ITYPE_EXTERN:
ef = it->funcs;
if (ef && ef->asn1_ex_clear)
ef->asn1_ex_clear(pval, it);
else
*pval = NULL;
break;
case ASN1_ITYPE_PRIMITIVE:
if (it->templates)
asn1_template_clear(pval, it->templates);
else
asn1_primitive_clear(pval, it);
break;
case ASN1_ITYPE_MSTRING:
asn1_primitive_clear(pval, it);
break;
case ASN1_ITYPE_CHOICE:
case ASN1_ITYPE_SEQUENCE:
case ASN1_ITYPE_NDEF_SEQUENCE:
*pval = NULL;
break;
}
}
static int asn1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt,
OSSL_LIB_CTX *libctx, const char *propq)
{
const ASN1_ITEM *it = ASN1_ITEM_ptr(tt->item);
int embed = tt->flags & ASN1_TFLG_EMBED;
ASN1_VALUE *tval;
int ret;
if (embed) {
tval = (ASN1_VALUE *)pval;
pval = &tval;
}
if (tt->flags & ASN1_TFLG_OPTIONAL) {
asn1_template_clear(pval, tt);
return 1;
}
/* If ANY DEFINED BY nothing to do */
if (tt->flags & ASN1_TFLG_ADB_MASK) {
*pval = NULL;
return 1;
}
/* If SET OF or SEQUENCE OF, its a STACK */
if (tt->flags & ASN1_TFLG_SK_MASK) {
STACK_OF(ASN1_VALUE) *skval;
skval = sk_ASN1_VALUE_new_null();
if (!skval) {
ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
ret = 0;
goto done;
}
*pval = (ASN1_VALUE *)skval;
ret = 1;
goto done;
}
/* Otherwise pass it back to the item routine */
ret = asn1_item_embed_new(pval, it, embed, libctx, propq);
done:
return ret;
}
static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
{
/* If ADB or STACK just NULL the field */
if (tt->flags & (ASN1_TFLG_ADB_MASK | ASN1_TFLG_SK_MASK))
*pval = NULL;
else
asn1_item_clear(pval, ASN1_ITEM_ptr(tt->item));
}
/*
* NB: could probably combine most of the real XXX_new() behaviour and junk
* all the old functions.
*/
static int asn1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
int embed)
{
ASN1_TYPE *typ;
ASN1_STRING *str;
int utype;
if (!it)
return 0;
if (it->funcs) {
const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
if (embed) {
if (pf->prim_clear) {
pf->prim_clear(pval, it);
return 1;
}
} else if (pf->prim_new) {
return pf->prim_new(pval, it);
}
}
if (it->itype == ASN1_ITYPE_MSTRING)
utype = -1;
else
utype = it->utype;
switch (utype) {
case V_ASN1_OBJECT:
*pval = (ASN1_VALUE *)OBJ_nid2obj(NID_undef);
return 1;
case V_ASN1_BOOLEAN:
*(ASN1_BOOLEAN *)pval = it->size;
return 1;
case V_ASN1_NULL:
*pval = (ASN1_VALUE *)1;
return 1;
case V_ASN1_ANY:
if ((typ = OPENSSL_malloc(sizeof(*typ))) == NULL) {
ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
return 0;
}
typ->value.ptr = NULL;
typ->type = -1;
*pval = (ASN1_VALUE *)typ;
break;
default:
if (embed) {
str = *(ASN1_STRING **)pval;
memset(str, 0, sizeof(*str));
str->type = utype;
str->flags = ASN1_STRING_FLAG_EMBED;
} else {
str = ASN1_STRING_type_new(utype);
*pval = (ASN1_VALUE *)str;
}
if (it->itype == ASN1_ITYPE_MSTRING && str)
str->flags |= ASN1_STRING_FLAG_MSTRING;
break;
}
if (*pval)
return 1;
return 0;
}
static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
int utype;
if (it && it->funcs) {
const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
if (pf->prim_clear)
pf->prim_clear(pval, it);
else
*pval = NULL;
return;
}
if (!it || (it->itype == ASN1_ITYPE_MSTRING))
utype = -1;
else
utype = it->utype;
if (utype == V_ASN1_BOOLEAN)
*(ASN1_BOOLEAN *)pval = it->size;
else
*pval = NULL;
}
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