/* crypto/asn1/x_name.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/x509.h>

static int x509_name_ex_d2i(ASN1_VALUE **val, const unsigned char **in,
                            long len, const ASN1_ITEM *it, int tag,
                            int aclass, char opt, ASN1_TLC *ctx);

static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out,
                            const ASN1_ITEM *it, int tag, int aclass);
static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it);
static void x509_name_ex_free(ASN1_VALUE **val, const ASN1_ITEM *it);

static int x509_name_encode(X509_NAME *a);

ASN1_SEQUENCE(X509_NAME_ENTRY) = {
        ASN1_SIMPLE(X509_NAME_ENTRY, object, ASN1_OBJECT),
        ASN1_SIMPLE(X509_NAME_ENTRY, value, ASN1_PRINTABLE)
} ASN1_SEQUENCE_END(X509_NAME_ENTRY)

IMPLEMENT_ASN1_FUNCTIONS(X509_NAME_ENTRY)
IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME_ENTRY)

/*
 * For the "Name" type we need a SEQUENCE OF { SET OF X509_NAME_ENTRY } so
 * declare two template wrappers for this
 */

ASN1_ITEM_TEMPLATE(X509_NAME_ENTRIES) =
        ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SET_OF, 0, RDNS, X509_NAME_ENTRY)
ASN1_ITEM_TEMPLATE_END(X509_NAME_ENTRIES)

ASN1_ITEM_TEMPLATE(X509_NAME_INTERNAL) =
        ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, Name, X509_NAME_ENTRIES)
ASN1_ITEM_TEMPLATE_END(X509_NAME_INTERNAL)

/*
 * Normally that's where it would end: we'd have two nested STACK structures
 * representing the ASN1. Unfortunately X509_NAME uses a completely different
 * form and caches encodings so we have to process the internal form and
 * convert to the external form.
 */

const ASN1_EXTERN_FUNCS x509_name_ff = {
    NULL,
    x509_name_ex_new,
    x509_name_ex_free,
    0,                          /* Default clear behaviour is OK */
    x509_name_ex_d2i,
    x509_name_ex_i2d
};

IMPLEMENT_EXTERN_ASN1(X509_NAME, V_ASN1_SEQUENCE, x509_name_ff)

IMPLEMENT_ASN1_FUNCTIONS(X509_NAME)

IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME)

static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it)
{
    X509_NAME *ret = NULL;
    ret = OPENSSL_malloc(sizeof(X509_NAME));
    if (!ret)
        goto memerr;
    if ((ret->entries = sk_X509_NAME_ENTRY_new_null()) == NULL)
        goto memerr;
    if ((ret->bytes = BUF_MEM_new()) == NULL)
        goto memerr;
    ret->modified = 1;
    *val = (ASN1_VALUE *)ret;
    return 1;

 memerr:
    ASN1err(ASN1_F_X509_NAME_EX_NEW, ERR_R_MALLOC_FAILURE);
    if (ret) {
        if (ret->entries)
            sk_X509_NAME_ENTRY_free(ret->entries);
        OPENSSL_free(ret);
    }
    return 0;
}

static void x509_name_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
    X509_NAME *a;
    if (!pval || !*pval)
        return;
    a = (X509_NAME *)*pval;

    BUF_MEM_free(a->bytes);
    sk_X509_NAME_ENTRY_pop_free(a->entries, X509_NAME_ENTRY_free);
    OPENSSL_free(a);
    *pval = NULL;
}

/*
 * Used with sk_pop_free() to free up the internal representation. NB: we
 * only free the STACK and not its contents because it is already present in
 * the X509_NAME structure.
 */

static void sk_internal_free(void *a)
{
    sk_free(a);
}

static int x509_name_ex_d2i(ASN1_VALUE **val, const unsigned char **in,
                            long len, const ASN1_ITEM *it, int tag,
                            int aclass, char opt, ASN1_TLC *ctx)
{
    const unsigned char *p = *in, *q;
    union {
        STACK *s;
        ASN1_VALUE *a;
    } intname = {
        NULL
    };
    union {
        X509_NAME *x;
        ASN1_VALUE *a;
    } nm = {
        NULL
    };
    int i, j, ret;
    STACK_OF(X509_NAME_ENTRY) *entries;
    X509_NAME_ENTRY *entry;
    q = p;

    /* Get internal representation of Name */
    ret = ASN1_item_ex_d2i(&intname.a,
                           &p, len, ASN1_ITEM_rptr(X509_NAME_INTERNAL),
                           tag, aclass, opt, ctx);

    if (ret <= 0)
        return ret;

    if (*val)
        x509_name_ex_free(val, NULL);
    if (!x509_name_ex_new(&nm.a, NULL))
        goto err;
    /* We've decoded it: now cache encoding */
    if (!BUF_MEM_grow(nm.x->bytes, p - q))
        goto err;
    memcpy(nm.x->bytes->data, q, p - q);

    /* Convert internal representation to X509_NAME structure */
    for (i = 0; i < sk_num(intname.s); i++) {
        entries = (STACK_OF(X509_NAME_ENTRY) *)sk_value(intname.s, i);
        for (j = 0; j < sk_X509_NAME_ENTRY_num(entries); j++) {
            entry = sk_X509_NAME_ENTRY_value(entries, j);
            entry->set = i;
            if (!sk_X509_NAME_ENTRY_push(nm.x->entries, entry))
                goto err;
        }
        sk_X509_NAME_ENTRY_free(entries);
    }
    sk_free(intname.s);
    nm.x->modified = 0;
    *val = nm.a;
    *in = p;
    return ret;
 err:
    if (nm.x != NULL)
        X509_NAME_free(nm.x);
    ASN1err(ASN1_F_X509_NAME_EX_D2I, ERR_R_NESTED_ASN1_ERROR);
    return 0;
}

static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out,
                            const ASN1_ITEM *it, int tag, int aclass)
{
    int ret;
    X509_NAME *a = (X509_NAME *)*val;
    if (a->modified) {
        ret = x509_name_encode((X509_NAME *)a);
        if (ret < 0)
            return ret;
    }
    ret = a->bytes->length;
    if (out != NULL) {
        memcpy(*out, a->bytes->data, ret);
        *out += ret;
    }
    return ret;
}

static int x509_name_encode(X509_NAME *a)
{
    union {
        STACK *s;
        ASN1_VALUE *a;
    } intname = {
        NULL
    };
    int len;
    unsigned char *p;
    STACK_OF(X509_NAME_ENTRY) *entries = NULL;
    X509_NAME_ENTRY *entry;
    int i, set = -1;
    intname.s = sk_new_null();
    if (!intname.s)
        goto memerr;
    for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
        entry = sk_X509_NAME_ENTRY_value(a->entries, i);
        if (entry->set != set) {
            entries = sk_X509_NAME_ENTRY_new_null();
            if (!entries)
                goto memerr;
            if (!sk_push(intname.s, (char *)entries))
                goto memerr;
            set = entry->set;
        }
        if (!sk_X509_NAME_ENTRY_push(entries, entry))
            goto memerr;
    }
    len = ASN1_item_ex_i2d(&intname.a, NULL,
                           ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
    if (!BUF_MEM_grow(a->bytes, len))
        goto memerr;
    p = (unsigned char *)a->bytes->data;
    ASN1_item_ex_i2d(&intname.a,
                     &p, ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
    sk_pop_free(intname.s, sk_internal_free);
    a->modified = 0;
    return len;
 memerr:
    sk_pop_free(intname.s, sk_internal_free);
    ASN1err(ASN1_F_X509_NAME_ENCODE, ERR_R_MALLOC_FAILURE);
    return -1;
}

int X509_NAME_set(X509_NAME **xn, X509_NAME *name)
{
    X509_NAME *in;

    if (!xn || !name)
        return (0);

    if (*xn != name) {
        in = X509_NAME_dup(name);
        if (in != NULL) {
            X509_NAME_free(*xn);
            *xn = in;
        }
    }
    return (*xn != NULL);
}

IMPLEMENT_STACK_OF(X509_NAME_ENTRY)

IMPLEMENT_ASN1_SET_OF(X509_NAME_ENTRY)