/*

 * Copyright 1995-2026 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 <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/safestack.h>

#include <openssl/asn1.h>

#include <openssl/objects.h>

#include <openssl/evp.h>

#include <openssl/x509.h>

#include <openssl/x509v3.h>

#include "x509_local.h"

#include <crypto/asn1.h>

int X509v3_get_ext_count(const STACK_OF(X509_EXTENSION) *x)

{

    int ret;

    if (x == NULL)

        return 0;

    ret = sk_X509_EXTENSION_num(x);

    return ret > 0 ? ret : 0;

}

int X509v3_get_ext_by_NID(const STACK_OF(X509_EXTENSION) *x, int nid,

    int lastpos)

{

    ASN1_OBJECT *obj;

    obj = OBJ_nid2obj(nid);

    if (obj == NULL)

        return -2;

    return X509v3_get_ext_by_OBJ(x, obj, lastpos);

}

int X509v3_get_ext_by_OBJ(const STACK_OF(X509_EXTENSION) *sk,

    const ASN1_OBJECT *obj, int lastpos)

{

    int n;

    X509_EXTENSION *ex;

    if (sk == NULL)

        return -1;

    lastpos++;

    if (lastpos < 0)

        lastpos = 0;

    n = sk_X509_EXTENSION_num(sk);

    for (; lastpos < n; lastpos++) {

        ex = sk_X509_EXTENSION_value(sk, lastpos);

        if (OBJ_cmp(ex->object, obj) == 0)

            return lastpos;

    }

    return -1;

}

int X509v3_get_ext_by_critical(const STACK_OF(X509_EXTENSION) *sk, int crit,

    int lastpos)

{

    int n, c;

    X509_EXTENSION *ex;

    if (sk == NULL)

        return -1;

    lastpos++;

    if (lastpos < 0)

        lastpos = 0;

    n = sk_X509_EXTENSION_num(sk);

    for (; lastpos < n; lastpos++) {

        ex = sk_X509_EXTENSION_value(sk, lastpos);

        c = X509_EXTENSION_get_critical(ex);

        crit = crit != 0;

        if (c == crit)

            return lastpos;

    }

    return -1;

}

const X509_EXTENSION *X509v3_get_ext(const STACK_OF(X509_EXTENSION) *x, int loc)

{

    if (x == NULL || sk_X509_EXTENSION_num(x) <= loc || loc < 0)

        return NULL;

    else

        return sk_X509_EXTENSION_value(x, loc);

}

X509_EXTENSION *X509v3_delete_ext(STACK_OF(X509_EXTENSION) *x, int loc)

{

    return sk_X509_EXTENSION_delete(x, loc);

}

X509_EXTENSION *X509v3_delete_extension(STACK_OF(X509_EXTENSION) **x, int loc)

{

    X509_EXTENSION *ext;

    if (x == NULL)

        return NULL;

    /* Set extensions to NULL when last element dropped */

    if ((ext = X509v3_delete_ext(*x, loc)) != NULL

        && sk_X509_EXTENSION_num(*x) == 0) {

        sk_X509_EXTENSION_free(*x);

        *x = NULL;

    }

    return ext;

}

STACK_OF(X509_EXTENSION) *X509v3_add_ext(STACK_OF(X509_EXTENSION) **x,

    const X509_EXTENSION *ex, int loc)

{

    X509_EXTENSION *new_ex = NULL;

    int n;

    STACK_OF(X509_EXTENSION) *sk = NULL;

    if (x == NULL) {

        ERR_raise(ERR_LIB_X509, ERR_R_PASSED_NULL_PARAMETER);

        goto err;

    }

    if (*x == NULL) {

        if ((sk = sk_X509_EXTENSION_new_null()) == NULL) {

            ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);

            goto err;

        }

    } else

        sk = *x;

    if (ossl_ignored_x509_extension(ex, X509V3_ADD_SILENT))

        goto done;

    n = sk_X509_EXTENSION_num(sk);

    if (loc > n)

        loc = n;

    else if (loc < 0)

        loc = n;

    if ((new_ex = X509_EXTENSION_dup(ex)) == NULL) {

        ERR_raise(ERR_LIB_X509, ERR_R_ASN1_LIB);

        goto err;

    }

    if (!sk_X509_EXTENSION_insert(sk, new_ex, loc)) {

        ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);

        goto err;

    }

done:

    if (*x == NULL)

        *x = sk;

    return sk;

err:

    X509_EXTENSION_free(new_ex);

    if (x != NULL && *x == NULL)

        sk_X509_EXTENSION_free(sk);

    return NULL;

}

/* This returns NULL also in non-error case *target == NULL && sk_X509_EXTENSION_num(exts) <= 0 */

STACK_OF(X509_EXTENSION) *X509v3_add_extensions(STACK_OF(X509_EXTENSION) **target,

    const STACK_OF(X509_EXTENSION) *exts)

{

    int i;

    if (target == NULL) {

        ERR_raise(ERR_LIB_X509, ERR_R_PASSED_NULL_PARAMETER);

        return NULL;

    }

    for (i = 0; i < sk_X509_EXTENSION_num(exts); i++) {

        const X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);

        const ASN1_OBJECT *obj = X509_EXTENSION_get_object(ext);

        int idx = X509v3_get_ext_by_OBJ(*target, obj, -1);

        /* Does extension exist in target? */

        if (idx != -1) {

            /* Delete all extensions of same type */

            do {

                X509_EXTENSION_free(sk_X509_EXTENSION_delete(*target, idx));

                idx = X509v3_get_ext_by_OBJ(*target, obj, -1);

            } while (idx != -1);

        }

        if (!X509v3_add_ext(target, ext, -1))

            return NULL;

    }

    return *target;

}

X509_EXTENSION *X509_EXTENSION_create_by_NID(X509_EXTENSION **ex, int nid,

    int crit,

    ASN1_OCTET_STRING *data)

{

    ASN1_OBJECT *obj;

    X509_EXTENSION *ret;

    obj = OBJ_nid2obj(nid);

    if (obj == NULL) {

        ERR_raise(ERR_LIB_X509, X509_R_UNKNOWN_NID);

        return NULL;

    }

    ret = X509_EXTENSION_create_by_OBJ(ex, obj, crit, data);

    if (ret == NULL)

        ASN1_OBJECT_free(obj);

    return ret;

}

X509_EXTENSION *X509_EXTENSION_create_by_OBJ(X509_EXTENSION **ex,

    const ASN1_OBJECT *obj, int crit,

    ASN1_OCTET_STRING *data)

{

    X509_EXTENSION *ret;

    if ((ex == NULL) || (*ex == NULL)) {

        if ((ret = X509_EXTENSION_new()) == NULL) {

            ERR_raise(ERR_LIB_X509, ERR_R_ASN1_LIB);

            return NULL;

        }

    } else

        ret = *ex;

    if (!X509_EXTENSION_set_object(ret, obj))

        goto err;

    if (!X509_EXTENSION_set_critical(ret, crit))

        goto err;

    if (!X509_EXTENSION_set_data(ret, data))

        goto err;

    if ((ex != NULL) && (*ex == NULL))

        *ex = ret;

    return ret;

err:

    if ((ex == NULL) || (ret != *ex))

        X509_EXTENSION_free(ret);

    return NULL;

}

int X509_EXTENSION_set_object(X509_EXTENSION *ex, const ASN1_OBJECT *obj)

{

    if ((ex == NULL) || (obj == NULL))

        return 0;

    ASN1_OBJECT_free(ex->object);

    ex->object = OBJ_dup(obj);

    return ex->object != NULL;

}

int X509_EXTENSION_set_critical(X509_EXTENSION *ex, int crit)

{

    if (ex == NULL)

        return 0;

    ex->critical = (crit) ? 0xFF : 0;

    return 1;

}

int X509_EXTENSION_set_data(X509_EXTENSION *ex, const ASN1_OCTET_STRING *data)

{

    int i;

    if (ex == NULL)

        return 0;

    i = ASN1_OCTET_STRING_set(&ex->value, data->data, data->length);

    if (!i)

        return 0;

    return 1;

}

const ASN1_OBJECT *X509_EXTENSION_get_object(const X509_EXTENSION *ex)

{

    if (ex == NULL)

        return NULL;

    return ex->object;

}

const ASN1_OCTET_STRING *X509_EXTENSION_get_data(const X509_EXTENSION *ex)

{

    if (ex == NULL)

        return NULL;

    return &ex->value;

}

int X509_EXTENSION_get_critical(const X509_EXTENSION *ex)

{

    if (ex == NULL)

        return 0;

    if (ex->critical > 0)

        return 1;

    return 0;

}