Fix ASN1 bug when decoding OTHER type.

[thirdparty/openssl.git] / crypto / asn1 / tasn_dec.c

/* tasn_dec.c */
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 2000 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/buffer.h>
#include <openssl/err.h>

static int asn1_check_eoc(unsigned char **in, long len);
static int asn1_collect(BUF_MEM *buf, unsigned char **in, long len, char inf, int tag, int aclass);
static int collect_data(BUF_MEM *buf, unsigned char **p, long plen);
static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, char *inf, char *cst,
                        unsigned char **in, long len, int exptag, int expclass, char opt, ASN1_TLC *ctx);
static int asn1_template_ex_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx);
static int asn1_template_noexp_d2i(ASN1_VALUE **val, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx);
static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, unsigned char **in, long len,
                                        const ASN1_ITEM *it, int tag, int aclass, char opt, ASN1_TLC *ctx);

/* Macro to initialize and invalidate the cache */

#define asn1_tlc_clear(c)       if(c) (c)->valid = 0

/* Decode an ASN1 item, this currently behaves just 
 * like a standard 'd2i' function. 'in' points to 
 * a buffer to read the data from, in future we will
 * have more advanced versions that can input data
 * a piece at a time and this will simply be a special
 * case.
 */

ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_ITEM *it)
{
        ASN1_TLC c;
        ASN1_VALUE *ptmpval = NULL;
        if(!pval) pval = &ptmpval;
        asn1_tlc_clear(&c);
        if(ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0) 
                return *pval;
        return NULL;
}

int ASN1_template_d2i(ASN1_VALUE **pval, unsigned char **in, long len, const ASN1_TEMPLATE *tt)
{
        ASN1_TLC c;
        asn1_tlc_clear(&c);
        return asn1_template_ex_d2i(pval, in, len, tt, 0, &c);
}


/* Decode an item, taking care of IMPLICIT tagging, if any.
 * If 'opt' set and tag mismatch return -1 to handle OPTIONAL
 */

int ASN1_item_ex_d2i(ASN1_VALUE **pval, 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;
        unsigned char *p, *q, imphack = 0, oclass;
        char seq_eoc, seq_nolen, cst, isopt;
        long tmplen;
        int i;
        int otag;
        int ret = 0;
        ASN1_VALUE *pchval, **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) {
                        p = *in;
                        imphack = *p;
                        *p = (unsigned char)((*p & V_ASN1_CONSTRUCTED) | it->utype);
                }

                ptmpval = cf->asn1_d2i(pval, in, len);

                if(tag != -1) *p = 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) {
                        if(!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 */
                pchval = NULL;
                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_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;
                } else seq_nolen = seq_eoc;     /* If indefinite we don't do a length check */
                if(!cst) {
                        ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_SEQUENCE_NOT_CONSTRUCTED);
                        goto err;
                }

                if(!*pval) {
                        if(!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;
}

/* Templates are handled with two separate functions. One handles any EXPLICIT tag and the other handles the
 * rest.
 */

int asn1_template_ex_d2i(ASN1_VALUE **val, unsigned char **in, long inlen, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx)
{
        int flags, aclass;
        int ret;
        long len;
        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_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_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);
        *val = NULL;
        return 0;
}

static int asn1_template_noexp_d2i(ASN1_VALUE **val, unsigned char **in, long len, const ASN1_TEMPLATE *tt, char opt, ASN1_TLC *ctx)
{
        int flags, aclass;
        int ret;
        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_EX_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_EX_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_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_D2I, ERR_R_NESTED_ASN1_ERROR);
                                goto err;
                        }
                        len -= p - q;
                        if(!sk_push((STACK *)*val, (char *)skfield)) {
                                ASN1err(ASN1_F_ASN1_TEMPLATE_D2I, ERR_R_MALLOC_FAILURE);
                                goto err;
                        }
                }
                if(sk_eoc) {
                        ASN1err(ASN1_F_ASN1_TEMPLATE_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_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_D2I, ERR_R_NESTED_ASN1_ERROR);
                        goto err;
                } else if(ret == -1) return -1;
        }

        *in = p;
        return 1;

        err:
        ASN1_template_free(val, tt);
        *val = NULL;
        return 0;
}

static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, unsigned char **in, long inlen, 
                                                const ASN1_ITEM *it,
                                                int tag, int aclass, char opt, ASN1_TLC *ctx)
{
        int ret = 0, utype;
        long plen;
        char cst, inf, free_cont = 0;
        unsigned char *p;
        BUF_MEM buf;
        unsigned char *cont = NULL;
        long len; 
        if(!pval) {
                ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);
                return 0; /* Should never happen */
        }

        if(it->itype == ASN1_ITYPE_MSTRING) {
                utype = tag;
                tag = -1;
        } else utype = it->utype;

        if(utype == V_ASN1_ANY) {
                /* If type is ANY need to figure out type from tag */
                unsigned char oclass;
                if(tag >= 0) {
                        ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_TAGGED_ANY);
                        return 0;
                }
                if(opt) {
                        ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_OPTIONAL_ANY);
                        return 0;
                }
                p = *in;
                ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL, &p, inlen, -1, 0, 0, ctx);
                if(!ret) {
                        ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
                        return 0;
                }
                if(oclass != V_ASN1_UNIVERSAL) utype = V_ASN1_OTHER;
        }
        if(tag == -1) {
                tag = utype;
                aclass = V_ASN1_UNIVERSAL;
        }
        p = *in;
        /* Check header */
        ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst, &p, inlen, tag, aclass, opt, ctx);
        if(!ret) {
                ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);
                return 0;
        } else if(ret == -1) return -1;
        /* SEQUENCE, SET and "OTHER" are left in encoded form */
        if((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) {
                /* Clear context cache for type OTHER because the auto clear when
                 * we have a exact match wont work
                 */
                if(utype == V_ASN1_OTHER) {
                        asn1_tlc_clear(ctx);
                /* SEQUENCE and SET must be constructed */
                } else if(!cst) {
                        ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_TYPE_NOT_CONSTRUCTED);
                        return 0;
                }

                cont = *in;
                /* If indefinite length constructed find the real end */
                if(inf) {
                        if(!asn1_collect(NULL, &p, plen, inf, -1, -1)) goto err;
                        len = p - cont;
                } else {
                        len = p - cont + plen;
                        p += plen;
                        buf.data = NULL;
                }
        } else if(cst) {
                buf.length = 0;
                buf.max = 0;
                buf.data = NULL;
                /* Should really check the internal tags are correct but
                 * some things may get this wrong. The relevant specs
                 * say that constructed string types should be OCTET STRINGs
                 * internally irrespective of the type. So instead just check
                 * for UNIVERSAL class and ignore the tag.
                 */
                if(!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL)) goto err;
                len = buf.length;
                /* Append a final null to string */
                if(!BUF_MEM_grow(&buf, len + 1)) {
                        ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
                        return 0;
                }
                buf.data[len] = 0;
                cont = (unsigned char *)buf.data;
                free_cont = 1;
        } else {
                cont = p;
                len = plen;
                p += plen;
        }

        /* We now have content length and type: translate into a structure */
        if(!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it)) goto err;

        *in = p;
        ret = 1;
        err:
        if(free_cont && buf.data) OPENSSL_free(buf.data);
        return ret;
}

/* Translate ASN1 content octets into a structure */

int asn1_ex_c2i(ASN1_VALUE **pval, unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it)
{
        ASN1_STRING *stmp;
        ASN1_TYPE *typ = NULL;
        int ret = 0;
        const ASN1_PRIMITIVE_FUNCS *pf;
        ASN1_INTEGER **tint;
        pf = it->funcs;
        if(pf && pf->prim_c2i) return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
        /* If ANY type clear type and set pointer to internal value */
        if(it->utype == V_ASN1_ANY) {
                if(!*pval) {
                        typ = ASN1_TYPE_new();
                        *pval = (ASN1_VALUE *)typ;
                } else typ = (ASN1_TYPE *)*pval;
                if(utype != typ->type) ASN1_TYPE_set(typ, utype, NULL);
                pval = (ASN1_VALUE **)&typ->value.ptr;
        }
        switch(utype) {
                case V_ASN1_OBJECT:
                if(!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len)) goto err;
                break;

                case V_ASN1_NULL:
                if(len) {
                        ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_NULL_IS_WRONG_LENGTH);
                        goto err;
                }
                *pval = (ASN1_VALUE *)1;
                break;

                case V_ASN1_BOOLEAN:
                if(len != 1) {
                        ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_BOOLEAN_IS_WRONG_LENGTH);
                        goto err;
                } else {
                        ASN1_BOOLEAN *tbool;
                        tbool = (ASN1_BOOLEAN *)pval;
                        *tbool = *cont;
                }
                break;

                case V_ASN1_BIT_STRING:
                if(!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len)) goto err;
                break;

                case V_ASN1_INTEGER:
                case V_ASN1_NEG_INTEGER:
                case V_ASN1_ENUMERATED:
                case V_ASN1_NEG_ENUMERATED:
                tint = (ASN1_INTEGER **)pval;
                if(!c2i_ASN1_INTEGER(tint, &cont, len)) goto err;
                /* Fixup type to match the expected form */
                (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);
                break;

                case V_ASN1_OCTET_STRING:
                case V_ASN1_NUMERICSTRING:
                case V_ASN1_PRINTABLESTRING:
                case V_ASN1_T61STRING:
                case V_ASN1_VIDEOTEXSTRING:
                case V_ASN1_IA5STRING:
                case V_ASN1_UTCTIME:
                case V_ASN1_GENERALIZEDTIME:
                case V_ASN1_GRAPHICSTRING:
                case V_ASN1_VISIBLESTRING:
                case V_ASN1_GENERALSTRING:
                case V_ASN1_UNIVERSALSTRING:
                case V_ASN1_BMPSTRING:
                case V_ASN1_UTF8STRING:
                case V_ASN1_OTHER:
                case V_ASN1_SET:
                case V_ASN1_SEQUENCE:
                default:
                /* All based on ASN1_STRING and handled the same */
                if(!*pval) {
                        stmp = ASN1_STRING_type_new(utype);
                        if(!stmp) {
                                ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
                                goto err;
                        }
                        *pval = (ASN1_VALUE *)stmp;
                } else {
                        stmp = (ASN1_STRING *)*pval;
                        stmp->type = utype;
                }
                /* If we've already allocated a buffer use it */
                if(*free_cont) {
                        if(stmp->data) OPENSSL_free(stmp->data);
                        stmp->data = cont;
                        stmp->length = len;
                        *free_cont = 0;
                } else {
                        if(!ASN1_STRING_set(stmp, cont, len)) {
                                ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_MALLOC_FAILURE);
                                ASN1_STRING_free(stmp); 
                                *pval = NULL;
                                goto err;
                        }
                }
                break;
        }
        /* If ASN1_ANY and NULL type fix up value */
        if(typ && utype==V_ASN1_NULL) typ->value.ptr = NULL;

        ret = 1;
        err:
        if(!ret) ASN1_TYPE_free(typ);
        return ret;
}

/* This function collects the asn1 data from a constructred string
 * type into a buffer. The values of 'in' and 'len' should refer
 * to the contents of the constructed type and 'inf' should be set
 * if it is indefinite length. If 'buf' is NULL then we just want
 * to find the end of the current structure: useful for indefinite
 * length constructed stuff.
 */

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;
        /* 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(!asn1_collect(buf, &p, plen, ininf, tag, aclass)) return 0;
                } else {
                        if(!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 collect_data(BUF_MEM *buf, unsigned char **p, long plen)
{
                int len;
                if(buf) {
                        len = buf->length;
                        if(!BUF_MEM_grow(buf, len + plen)) {
                                ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);
                                return 0;
                        }
                        memcpy(buf->data + len, *p, plen);
                }
                *p += plen;
                return 1;
}

/* Check for ASN1 EOC and swallow it if found */

static int asn1_check_eoc(unsigned char **in, long len)
{
        unsigned char *p;
        if(len < 2) return 0;
        p = *in;
        if(!p[0] && !p[1]) {
                *in += 2;
                return 1;
        }
        return 0;
}

/* Check an ASN1 tag and length: a bit like ASN1_get_object
 * but it sets the length for indefinite length constructed
 * form, we don't know the exact length but we can set an
 * upper bound to the amount of data available minus the
 * header length just read.
 */

static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, char *inf, char *cst,
                unsigned char **in, long len, int exptag, int expclass, char opt, ASN1_TLC *ctx)
{
        int i;
        int ptag, pclass;
        long plen;
        unsigned char *p, *q;
        p = *in;
        q = p;

        if(ctx && ctx->valid) {
                i = ctx->ret;
                plen = ctx->plen;
                pclass = ctx->pclass;
                ptag = ctx->ptag;
                p += ctx->hdrlen;
        } else {
                i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);
                if(ctx) {
                        ctx->ret = i;
                        ctx->plen = plen;
                        ctx->pclass = pclass;
                        ctx->ptag = ptag;
                        ctx->hdrlen = p - q;
                        ctx->valid = 1;
                        /* If definite length, length + header can't exceed total
                         * amount of data available.
                         */
                        if(!(i & 1) && ((plen + ctx->hdrlen) > len)) {
                                ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_TOO_LONG);
                                asn1_tlc_clear(ctx);
                                return 0;
                        }
                }
        }

        if(i & 0x80) {
                ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);
                asn1_tlc_clear(ctx);
                return 0;
        }
        if(exptag >= 0) {
                if((exptag != ptag) || (expclass != pclass)) {
                        /* If type is OPTIONAL, not an error, but indicate missing
                         * type.
                         */
                        if(opt) return -1;
                        asn1_tlc_clear(ctx);
                        ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);
                        return 0;
                }
                /* We have a tag and class match, so assume we are going to do something with it */
                asn1_tlc_clear(ctx);
        }

        if(i & 1) plen = len - (p - q);

        if(inf) *inf = i & 1;

        if(cst) *cst = i & V_ASN1_CONSTRUCTED;

        if(olen) *olen = plen;
        if(oclass) *oclass = pclass;
        if(otag) *otag = ptag;

        *in = p;
        return 1;
}