/* $OpenBSD: x509_att.c,v 1.26 2025/05/10 05:54:39 tb Exp $ */
/* 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 <openssl/asn1.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/stack.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>

#include "err_local.h"
#include "x509_local.h"

int
X509at_get_attr_by_NID(const STACK_OF(X509_ATTRIBUTE) *x, int nid, int lastpos)
{
        ASN1_OBJECT *obj;

        obj = OBJ_nid2obj(nid);
        if (obj == NULL)
                return (-2);
        return (X509at_get_attr_by_OBJ(x, obj, lastpos));
}

int
X509at_get_attr_by_OBJ(const STACK_OF(X509_ATTRIBUTE) *sk,
    const ASN1_OBJECT *obj, int lastpos)
{
        int n;
        X509_ATTRIBUTE *ex;

        if (sk == NULL)
                return (-1);
        lastpos++;
        if (lastpos < 0)
                lastpos = 0;
        n = sk_X509_ATTRIBUTE_num(sk);
        for (; lastpos < n; lastpos++) {
                ex = sk_X509_ATTRIBUTE_value(sk, lastpos);
                if (OBJ_cmp(ex->object, obj) == 0)
                        return (lastpos);
        }
        return (-1);
}

STACK_OF(X509_ATTRIBUTE) *
X509at_add1_attr(STACK_OF(X509_ATTRIBUTE) **x, X509_ATTRIBUTE *attr)
{
        X509_ATTRIBUTE *new_attr = NULL;
        STACK_OF(X509_ATTRIBUTE) *sk = NULL;

        if (x == NULL) {
                X509error(ERR_R_PASSED_NULL_PARAMETER);
                return (NULL);
        }

        if (*x == NULL) {
                if ((sk = sk_X509_ATTRIBUTE_new_null()) == NULL)
                        goto err;
        } else
                sk = *x;

        if ((new_attr = X509_ATTRIBUTE_dup(attr)) == NULL)
                goto err2;
        if (!sk_X509_ATTRIBUTE_push(sk, new_attr))
                goto err;
        if (*x == NULL)
                *x = sk;
        return (sk);

err:
        X509error(ERR_R_MALLOC_FAILURE);
err2:
        if (new_attr != NULL)
                X509_ATTRIBUTE_free(new_attr);
        if (sk != NULL && sk != *x)
                sk_X509_ATTRIBUTE_free(sk);
        return (NULL);
}

STACK_OF(X509_ATTRIBUTE) *
X509at_add1_attr_by_OBJ(STACK_OF(X509_ATTRIBUTE) **x, const ASN1_OBJECT *obj,
    int type, const unsigned char *bytes, int len)
{
        X509_ATTRIBUTE *attr;
        STACK_OF(X509_ATTRIBUTE) *ret;

        attr = X509_ATTRIBUTE_create_by_OBJ(NULL, obj, type, bytes, len);
        if (!attr)
                return 0;
        ret = X509at_add1_attr(x, attr);
        X509_ATTRIBUTE_free(attr);
        return ret;
}

STACK_OF(X509_ATTRIBUTE) *
X509at_add1_attr_by_NID(STACK_OF(X509_ATTRIBUTE) **x, int nid, int type,
    const unsigned char *bytes, int len)
{
        X509_ATTRIBUTE *attr;
        STACK_OF(X509_ATTRIBUTE) *ret;

        attr = X509_ATTRIBUTE_create_by_NID(NULL, nid, type, bytes, len);
        if (!attr)
                return 0;
        ret = X509at_add1_attr(x, attr);
        X509_ATTRIBUTE_free(attr);
        return ret;
}

STACK_OF(X509_ATTRIBUTE) *
X509at_add1_attr_by_txt(STACK_OF(X509_ATTRIBUTE) **x, const char *attrname,
    int type, const unsigned char *bytes, int len)
{
        X509_ATTRIBUTE *attr;
        STACK_OF(X509_ATTRIBUTE) *ret;

        attr = X509_ATTRIBUTE_create_by_txt(NULL, attrname, type, bytes, len);
        if (!attr)
                return 0;
        ret = X509at_add1_attr(x, attr);
        X509_ATTRIBUTE_free(attr);
        return ret;
}

void *
X509at_get0_data_by_OBJ(STACK_OF(X509_ATTRIBUTE) *x, const ASN1_OBJECT *obj,
    int lastpos, int type)
{
        int i;
        X509_ATTRIBUTE *at;

        i = X509at_get_attr_by_OBJ(x, obj, lastpos);
        if (i == -1)
                return NULL;
        if ((lastpos <= -2) && (X509at_get_attr_by_OBJ(x, obj, i) != -1))
                return NULL;
        at = sk_X509_ATTRIBUTE_value(x, i);
        if (lastpos <= -3 && (X509_ATTRIBUTE_count(at) != 1))
                return NULL;
        return X509_ATTRIBUTE_get0_data(at, 0, type, NULL);
}

X509_ATTRIBUTE *
X509_ATTRIBUTE_create_by_NID(X509_ATTRIBUTE **attr, int nid, int atrtype,
    const void *data, int len)
{
        ASN1_OBJECT *obj;
        X509_ATTRIBUTE *ret;

        obj = OBJ_nid2obj(nid);
        if (obj == NULL) {
                X509error(X509_R_UNKNOWN_NID);
                return (NULL);
        }
        ret = X509_ATTRIBUTE_create_by_OBJ(attr, obj, atrtype, data, len);
        if (ret == NULL)
                ASN1_OBJECT_free(obj);
        return (ret);
}
LCRYPTO_ALIAS(X509_ATTRIBUTE_create_by_NID);

X509_ATTRIBUTE *
X509_ATTRIBUTE_create_by_OBJ(X509_ATTRIBUTE **attr, const ASN1_OBJECT *obj,
    int atrtype, const void *data, int len)
{
        X509_ATTRIBUTE *ret;

        if ((attr == NULL) || (*attr == NULL)) {
                if ((ret = X509_ATTRIBUTE_new()) == NULL) {
                        X509error(ERR_R_MALLOC_FAILURE);
                        return (NULL);
                }
        } else
                ret= *attr;

        if (!X509_ATTRIBUTE_set1_object(ret, obj))
                goto err;
        if (!X509_ATTRIBUTE_set1_data(ret, atrtype, data, len))
                goto err;

        if ((attr != NULL) && (*attr == NULL))
                *attr = ret;
        return (ret);

err:
        if ((attr == NULL) || (ret != *attr))
                X509_ATTRIBUTE_free(ret);
        return (NULL);
}
LCRYPTO_ALIAS(X509_ATTRIBUTE_create_by_OBJ);

X509_ATTRIBUTE *
X509_ATTRIBUTE_create_by_txt(X509_ATTRIBUTE **attr, const char *atrname,
    int type, const unsigned char *bytes, int len)
{
        ASN1_OBJECT *obj;
        X509_ATTRIBUTE *nattr;

        obj = OBJ_txt2obj(atrname, 0);
        if (obj == NULL) {
                X509error(X509_R_INVALID_FIELD_NAME);
                ERR_asprintf_error_data("name=%s", atrname);
                return (NULL);
        }
        nattr = X509_ATTRIBUTE_create_by_OBJ(attr, obj, type, bytes, len);
        ASN1_OBJECT_free(obj);
        return nattr;
}
LCRYPTO_ALIAS(X509_ATTRIBUTE_create_by_txt);

int
X509_ATTRIBUTE_set1_object(X509_ATTRIBUTE *attr, const ASN1_OBJECT *obj)
{
        if ((attr == NULL) || (obj == NULL))
                return (0);
        ASN1_OBJECT_free(attr->object);
        attr->object = OBJ_dup(obj);
        return attr->object != NULL;
}
LCRYPTO_ALIAS(X509_ATTRIBUTE_set1_object);

int
X509_ATTRIBUTE_set1_data(X509_ATTRIBUTE *attr, int attrtype, const void *data,
    int len)
{
        ASN1_TYPE *ttmp = NULL;
        ASN1_STRING *stmp = NULL;
        int atype = 0;

        if (!attr)
                return 0;
        if (attrtype & MBSTRING_FLAG) {
                stmp = ASN1_STRING_set_by_NID(NULL, data, len, attrtype,
                    OBJ_obj2nid(attr->object));
                if (!stmp) {
                        X509error(ERR_R_ASN1_LIB);
                        return 0;
                }
                atype = stmp->type;
        } else if (len != -1){
                if (!(stmp = ASN1_STRING_type_new(attrtype)))
                        goto err;
                if (!ASN1_STRING_set(stmp, data, len))
                        goto err;
                atype = attrtype;
        }
        /*
         * This is a bit naughty because the attribute should really have
         * at least one value but some types use and zero length SET and
         * require this.
         */
        if (attrtype == 0) {
                ASN1_STRING_free(stmp);
                return 1;
        }

        if (!(ttmp = ASN1_TYPE_new()))
                goto err;
        if ((len == -1) && !(attrtype & MBSTRING_FLAG)) {
                if (!ASN1_TYPE_set1(ttmp, attrtype, data))
                        goto err;
        } else
                ASN1_TYPE_set(ttmp, atype, stmp);
        if (!sk_ASN1_TYPE_push(attr->set, ttmp))
                goto err;
        return 1;

err:
        ASN1_TYPE_free(ttmp);
        ASN1_STRING_free(stmp);
        X509error(ERR_R_MALLOC_FAILURE);
        return 0;
}
LCRYPTO_ALIAS(X509_ATTRIBUTE_set1_data);

int
X509_ATTRIBUTE_count(const X509_ATTRIBUTE *attr)
{
        if (attr == NULL)
                return 0;

        return sk_ASN1_TYPE_num(attr->set);
}
LCRYPTO_ALIAS(X509_ATTRIBUTE_count);

ASN1_OBJECT *
X509_ATTRIBUTE_get0_object(X509_ATTRIBUTE *attr)
{
        if (attr == NULL)
                return (NULL);
        return (attr->object);
}
LCRYPTO_ALIAS(X509_ATTRIBUTE_get0_object);

void *
X509_ATTRIBUTE_get0_data(X509_ATTRIBUTE *attr, int idx, int atrtype, void *data)
{
        ASN1_TYPE *ttmp;

        ttmp = X509_ATTRIBUTE_get0_type(attr, idx);
        if (!ttmp)
                return NULL;
        if (atrtype != ASN1_TYPE_get(ttmp)){
                X509error(X509_R_WRONG_TYPE);
                return NULL;
        }
        return ttmp->value.ptr;
}
LCRYPTO_ALIAS(X509_ATTRIBUTE_get0_data);

ASN1_TYPE *
X509_ATTRIBUTE_get0_type(X509_ATTRIBUTE *attr, int idx)
{
        if (attr == NULL)
                return (NULL);

        return sk_ASN1_TYPE_value(attr->set, idx);
}
LCRYPTO_ALIAS(X509_ATTRIBUTE_get0_type);