static int asn1_find_end(const unsigned char **in, long len, char inf)
{
int expected_eoc;
long plen;
const unsigned char *p = *in, *q;
/* If not indefinite length constructed just add length */
if (inf == 0)
{
*in += len;
return 1;
}
expected_eoc = 1;
/* Indefinite length constructed form. Find the end when enough EOCs
* are found. If more indefinite length constructed headers
* are encountered increment the expected eoc count otherwise just
* skip to the end of the data.
*/
while (len > 0)
{
if(asn1_check_eoc(&p, len))
{
expected_eoc--;
if (expected_eoc == 0)
break;
len -= 2;
continue;
}
q = p;
/* Just read in a header: only care about the length */
if(!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,
-1, 0, 0, NULL))
{
ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);
return 0;
}
if (inf)
expected_eoc++;
else
p += plen;
len -= p - q;
}
if (expected_eoc)
{
ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC);
return 0;
}
*in = p;
return 1;
}
static int asn1_collect(BUF_MEM *buf, unsigned char **in, long len, char inf, int tag, int aclass)
{
unsigned char *p, *q;
long plen;
char cst, ininf;
p = *in;
inf &= 1;
while(len > 0) {
q = p;
/* Check for EOC */
if(asn1_check_eoc(&p, len)) {
/* EOC is illegal outside indefinite length constructed form */
if(!inf) {
ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_UNEXPECTED_EOC);
return 0;
}
inf = 0;
break;
}
if(!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p, len, tag, aclass, 0, NULL)) {
ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
return 0;
}
/* If indefinite length constructed update max length */
if(cst) {
#ifdef OPENSSL_ALLOW_NESTED_ASN1_STRINGS
if (!asn1_collect(buf, &p, plen, ininf, tag, aclass))
return 0;
#else
ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING);
return 0;
#endif
} else {
if(plen && !collect_data(buf, &p, plen)) return 0;
}
len -= p - q;
}
if(inf) {
ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
return 0;
}
*in = p;
return 1;
}
static int asn1_template_noexp_d2i(ASN1_VALUE **val,
const unsigned char **in, long len,
const ASN1_TEMPLATE *tt, char opt,
ASN1_TLC *ctx)
{
int flags, aclass;
int ret;
const unsigned char *p, *q;
if (!val)
return 0;
flags = tt->flags;
aclass = flags & ASN1_TFLG_TAG_CLASS;
p = *in;
q = p;
if (flags & ASN1_TFLG_SK_MASK)
{
/* SET OF, SEQUENCE OF */
int sktag, skaclass;
char sk_eoc;
/* First work out expected inner tag value */
if (flags & ASN1_TFLG_IMPTAG)
{
sktag = tt->tag;
skaclass = aclass;
}
else
{
skaclass = V_ASN1_UNIVERSAL;
if (flags & ASN1_TFLG_SET_OF)
sktag = V_ASN1_SET;
else
sktag = V_ASN1_SEQUENCE;
}
/* Get the tag */
ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,
&p, len, sktag, skaclass, opt, ctx);
if (!ret)
{
ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
ERR_R_NESTED_ASN1_ERROR);
return 0;
}
else if (ret == -1)
return -1;
if (!*val)
*val = (ASN1_VALUE *)sk_new_null();
else
{
/* We've got a valid STACK: free up any items present */
STACK *sktmp = (STACK *)*val;
ASN1_VALUE *vtmp;
while(sk_num(sktmp) > 0)
{
vtmp = (ASN1_VALUE *)sk_pop(sktmp);
ASN1_item_ex_free(&vtmp,
ASN1_ITEM_ptr(tt->item));
}
}
if (!*val)
{
ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
ERR_R_MALLOC_FAILURE);
goto err;
}
/* Read as many items as we can */
while(len > 0)
{
ASN1_VALUE *skfield;
q = p;
/* See if EOC found */
if (asn1_check_eoc(&p, len))
{
if (!sk_eoc)
{
ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
ASN1_R_UNEXPECTED_EOC);
goto err;
}
len -= p - q;
sk_eoc = 0;
break;
}
skfield = NULL;
if (!ASN1_item_ex_d2i(&skfield, &p, len,
ASN1_ITEM_ptr(tt->item),
-1, 0, 0, ctx))
{
ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
ERR_R_NESTED_ASN1_ERROR);
goto err;
}
len -= p - q;
if (!sk_push((STACK *)*val, (char *)skfield))
{
ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
ERR_R_MALLOC_FAILURE);
goto err;
}
}
if (sk_eoc)
{
ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC);
goto err;
}
}
else if (flags & ASN1_TFLG_IMPTAG)
{
/* IMPLICIT tagging */
ret = ASN1_item_ex_d2i(val, &p, len,
ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx);
if (!ret)
{
ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
ERR_R_NESTED_ASN1_ERROR);
goto err;
}
else if (ret == -1)
return -1;
}
else
{
/* Nothing special */
ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),
-1, 0, opt, ctx);
if (!ret)
{
ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,
ERR_R_NESTED_ASN1_ERROR);
goto err;
}
else if (ret == -1)
return -1;
}
*in = p;
return 1;
err:
ASN1_template_free(val, tt);
return 0;
}
static int asn1_template_ex_d2i(ASN1_VALUE **val,
const unsigned char **in, long inlen,
const ASN1_TEMPLATE *tt, char opt,
ASN1_TLC *ctx)
{
int flags, aclass;
int ret;
long len;
const unsigned char *p, *q;
char exp_eoc;
if (!val)
return 0;
flags = tt->flags;
aclass = flags & ASN1_TFLG_TAG_CLASS;
p = *in;
/* Check if EXPLICIT tag expected */
if (flags & ASN1_TFLG_EXPTAG)
{
char cst;
/* Need to work out amount of data available to the inner
* content and where it starts: so read in EXPLICIT header to
* get the info.
*/
ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,
&p, inlen, tt->tag, aclass, opt, ctx);
q = p;
if (!ret)
{
ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
ERR_R_NESTED_ASN1_ERROR);
return 0;
}
else if (ret == -1)
return -1;
if (!cst)
{
ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);
return 0;
}
/* We've found the field so it can't be OPTIONAL now */
ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);
if (!ret)
{
ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
ERR_R_NESTED_ASN1_ERROR);
return 0;
}
/* We read the field in OK so update length */
len -= p - q;
if (exp_eoc)
{
/* If NDEF we must have an EOC here */
if (!asn1_check_eoc(&p, len))
{
ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
ASN1_R_MISSING_EOC);
goto err;
}
}
else
{
/* Otherwise we must hit the EXPLICIT tag end or its
* an error */
if (len)
{
ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,
ASN1_R_EXPLICIT_LENGTH_MISMATCH);
goto err;
}
}
}
else
return asn1_template_noexp_d2i(val, in, inlen,
tt, opt, ctx);
*in = p;
return 1;
err:
ASN1_template_free(val, tt);
return 0;
}
int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,
const ASN1_ITEM *it,
int tag, int aclass, char opt, ASN1_TLC *ctx)
{
const ASN1_TEMPLATE *tt, *errtt = NULL;
const ASN1_COMPAT_FUNCS *cf;
const ASN1_EXTERN_FUNCS *ef;
const ASN1_AUX *aux = it->funcs;
ASN1_aux_cb *asn1_cb;
const unsigned char *p = NULL, *q;
unsigned char *wp=NULL; /* BIG FAT WARNING! BREAKS CONST WHERE USED */
unsigned char imphack = 0, oclass;
char seq_eoc, seq_nolen, cst, isopt;
long tmplen;
int i;
int otag;
int ret = 0;
ASN1_VALUE **pchptr, *ptmpval;
if (!pval)
return 0;
if (aux && aux->asn1_cb)
asn1_cb = aux->asn1_cb;
else asn1_cb = 0;
switch(it->itype)
{
case ASN1_ITYPE_PRIMITIVE:
if (it->templates)
{
/* tagging or OPTIONAL is currently illegal on an item
* template because the flags can't get passed down.
* In practice this isn't a problem: we include the
* relevant flags from the item template in the
* template itself.
*/
if ((tag != -1) || opt)
{
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);
goto err;
}
return asn1_template_ex_d2i(pval, in, len,
it->templates, opt, ctx);
}
return asn1_d2i_ex_primitive(pval, in, len, it,
tag, aclass, opt, ctx);
break;
case ASN1_ITYPE_MSTRING:
p = *in;
/* Just read in tag and class */
ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
&p, len, -1, 0, 1, ctx);
if (!ret)
{
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
ERR_R_NESTED_ASN1_ERROR);
goto err;
}
/* Must be UNIVERSAL class */
if (oclass != V_ASN1_UNIVERSAL)
{
/* If OPTIONAL, assume this is OK */
if (opt) return -1;
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
ASN1_R_MSTRING_NOT_UNIVERSAL);
goto err;
}
/* Check tag matches bit map */
if (!(ASN1_tag2bit(otag) & it->utype))
{
/* If OPTIONAL, assume this is OK */
if (opt)
return -1;
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
ASN1_R_MSTRING_WRONG_TAG);
goto err;
}
return asn1_d2i_ex_primitive(pval, in, len,
it, otag, 0, 0, ctx);
case ASN1_ITYPE_EXTERN:
/* Use new style d2i */
ef = it->funcs;
return ef->asn1_ex_d2i(pval, in, len,
it, tag, aclass, opt, ctx);
case ASN1_ITYPE_COMPAT:
/* we must resort to old style evil hackery */
cf = it->funcs;
/* If OPTIONAL see if it is there */
if (opt)
{
int exptag;
p = *in;
if (tag == -1)
exptag = it->utype;
else exptag = tag;
/* Don't care about anything other than presence
* of expected tag */
ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL,
&p, len, exptag, aclass, 1, ctx);
if (!ret)
{
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
ERR_R_NESTED_ASN1_ERROR);
goto err;
}
if (ret == -1)
return -1;
}
/* This is the old style evil hack IMPLICIT handling:
* since the underlying code is expecting a tag and
* class other than the one present we change the
* buffer temporarily then change it back afterwards.
* This doesn't and never did work for tags > 30.
*
* Yes this is *horrible* but it is only needed for
* old style d2i which will hopefully not be around
* for much longer.
* FIXME: should copy the buffer then modify it so
* the input buffer can be const: we should *always*
* copy because the old style d2i might modify the
* buffer.
*/
if (tag != -1)
{
wp = *(unsigned char **)in;
imphack = *wp;
if (p == NULL)
{
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
ERR_R_NESTED_ASN1_ERROR);
goto err;
}
*wp = (unsigned char)((*p & V_ASN1_CONSTRUCTED)
| it->utype);
}
ptmpval = cf->asn1_d2i(pval, in, len);
if (tag != -1)
*wp = imphack;
if (ptmpval)
return 1;
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
goto err;
case ASN1_ITYPE_CHOICE:
if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
goto auxerr;
/* Allocate structure */
if (!*pval && !ASN1_item_ex_new(pval, it))
{
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
ERR_R_NESTED_ASN1_ERROR);
goto err;
}
/* CHOICE type, try each possibility in turn */
p = *in;
for (i = 0, tt=it->templates; i < it->tcount; i++, tt++)
{
pchptr = asn1_get_field_ptr(pval, tt);
/* We mark field as OPTIONAL so its absence
* can be recognised.
*/
ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);
/* If field not present, try the next one */
if (ret == -1)
continue;
/* If positive return, read OK, break loop */
if (ret > 0)
break;
/* Otherwise must be an ASN1 parsing error */
errtt = tt;
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
ERR_R_NESTED_ASN1_ERROR);
goto err;
}
/* Did we fall off the end without reading anything? */
if (i == it->tcount)
{
/* If OPTIONAL, this is OK */
if (opt)
{
/* Free and zero it */
ASN1_item_ex_free(pval, it);
return -1;
}
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
ASN1_R_NO_MATCHING_CHOICE_TYPE);
goto err;
}
asn1_set_choice_selector(pval, i, it);
*in = p;
if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
goto auxerr;
return 1;
case ASN1_ITYPE_NDEF_SEQUENCE:
case ASN1_ITYPE_SEQUENCE:
p = *in;
tmplen = len;
/* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
if (tag == -1)
{
tag = V_ASN1_SEQUENCE;
aclass = V_ASN1_UNIVERSAL;
}
/* Get SEQUENCE length and update len, p */
ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,
&p, len, tag, aclass, opt, ctx);
if (!ret)
{
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
ERR_R_NESTED_ASN1_ERROR);
goto err;
}
else if (ret == -1)
return -1;
if (aux && (aux->flags & ASN1_AFLG_BROKEN))
{
len = tmplen - (p - *in);
seq_nolen = 1;
}
/* If indefinite we don't do a length check */
else seq_nolen = seq_eoc;
if (!cst)
{
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
goto err;
}
if (!*pval && !ASN1_item_ex_new(pval, it))
{
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
ERR_R_NESTED_ASN1_ERROR);
goto err;
}
if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))
goto auxerr;
/* Get each field entry */
for (i = 0, tt = it->templates; i < it->tcount; i++, tt++)
{
const ASN1_TEMPLATE *seqtt;
ASN1_VALUE **pseqval;
seqtt = asn1_do_adb(pval, tt, 1);
if (!seqtt)
goto err;
pseqval = asn1_get_field_ptr(pval, seqtt);
/* Have we ran out of data? */
if (!len)
break;
q = p;
if (asn1_check_eoc(&p, len))
{
if (!seq_eoc)
{
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
ASN1_R_UNEXPECTED_EOC);
goto err;
}
len -= p - q;
seq_eoc = 0;
q = p;
break;
}
/* This determines the OPTIONAL flag value. The field
* cannot be omitted if it is the last of a SEQUENCE
* and there is still data to be read. This isn't
* strictly necessary but it increases efficiency in
* some cases.
*/
if (i == (it->tcount - 1))
isopt = 0;
else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);
/* attempt to read in field, allowing each to be
* OPTIONAL */
ret = asn1_template_ex_d2i(pseqval, &p, len,
seqtt, isopt, ctx);
if (!ret)
{
errtt = seqtt;
goto err;
}
else if (ret == -1)
{
/* OPTIONAL component absent.
* Free and zero the field.
*/
ASN1_template_free(pseqval, seqtt);
continue;
}
/* Update length */
len -= p - q;
}
/* Check for EOC if expecting one */
if (seq_eoc && !asn1_check_eoc(&p, len))
{
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);
goto err;
}
/* Check all data read */
if (!seq_nolen && len)
{
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
ASN1_R_SEQUENCE_LENGTH_MISMATCH);
goto err;
}
/* If we get here we've got no more data in the SEQUENCE,
* however we may not have read all fields so check all
* remaining are OPTIONAL and clear any that are.
*/
for (; i < it->tcount; tt++, i++)
{
const ASN1_TEMPLATE *seqtt;
seqtt = asn1_do_adb(pval, tt, 1);
if (!seqtt)
goto err;
if (seqtt->flags & ASN1_TFLG_OPTIONAL)
{
ASN1_VALUE **pseqval;
pseqval = asn1_get_field_ptr(pval, seqtt);
ASN1_template_free(pseqval, seqtt);
}
else
{
errtt = seqtt;
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,
ASN1_R_FIELD_MISSING);
goto err;
}
}
/* Save encoding */
if (!asn1_enc_save(pval, *in, p - *in, it))
goto auxerr;
*in = p;
if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))
goto auxerr;
return 1;
default:
return 0;
}
auxerr:
ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);
err:
ASN1_item_ex_free(pval, it);
if (errtt)
ERR_add_error_data(4, "Field=", errtt->field_name,
", Type=", it->sname);
else
ERR_add_error_data(2, "Type=", it->sname);
return 0;
}
static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,
char inf, int tag, int aclass, int depth)
{
const unsigned char *p, *q;
long plen;
char cst, ininf;
p = *in;
inf &= 1;
/* If no buffer and not indefinite length constructed just pass over
* the encoded data */
if (!buf && !inf)
{
*in += len;
return 1;
}
while(len > 0)
{
q = p;
/* Check for EOC */
if (asn1_check_eoc(&p, len))
{
/* EOC is illegal outside indefinite length
* constructed form */
if (!inf)
{
ASN1err(ASN1_F_ASN1_COLLECT,
ASN1_R_UNEXPECTED_EOC);
return 0;
}
inf = 0;
break;
}
if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,
len, tag, aclass, 0, NULL))
{
ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);
return 0;
}
/* If indefinite length constructed update max length */
if (cst)
{
if (depth >= ASN1_MAX_STRING_NEST)
{
ASN1err(ASN1_F_ASN1_COLLECT,
ASN1_R_NESTED_ASN1_STRING);
return 0;
}
if (!asn1_collect(buf, &p, plen, ininf, tag, aclass,
depth + 1))
return 0;
}
else if (plen && !collect_data(buf, &p, plen))
return 0;
len -= p - q;
}
if (inf)
{
ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);
return 0;
}
*in = p;
return 1;
}
