/*

 * 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/bn.h>

#include <openssl/evp.h>

#include <openssl/asn1.h>

#include <openssl/asn1t.h>

#include <openssl/x509.h>

#include "crypto/x509.h"

#include <openssl/objects.h>

#include <openssl/buffer.h>

#include <openssl/pem.h>

X509_REQ *X509_to_X509_REQ(const X509 *x, EVP_PKEY *pkey, const EVP_MD *md)

{

    X509_REQ *ret;

    X509_REQ_INFO *ri;

    int i;

    EVP_PKEY *pktmp;

    OSSL_LIB_CTX *libctx;

    const char *propq;

    ossl_x509_get0_libctx(x, &libctx, &propq);

    ret = X509_REQ_new_ex(libctx, propq);

    if (ret == NULL) {

        ERR_raise(ERR_LIB_X509, ERR_R_ASN1_LIB);

        goto err;

    }

    ri = &ret->req_info;

    ri->version->length = 1;

    ri->version->data = OPENSSL_malloc(1);

    if (ri->version->data == NULL)

        goto err;

    ri->version->data[0] = 0; /* version == 0 */

    if (!X509_REQ_set_subject_name(ret, X509_get_subject_name(x)))

        goto err;

    pktmp = X509_get0_pubkey(x);

    if (pktmp == NULL)

        goto err;

    i = X509_REQ_set_pubkey(ret, pktmp);

    if (!i)

        goto err;

    if (pkey != NULL) {

        if (!X509_REQ_sign(ret, pkey, md))

            goto err;

    }

    return ret;

err:

    X509_REQ_free(ret);

    return NULL;

}

EVP_PKEY *X509_REQ_get_pubkey(X509_REQ *req)

{

    if (req == NULL)

        return NULL;

    return X509_PUBKEY_get(req->req_info.pubkey);

}

EVP_PKEY *X509_REQ_get0_pubkey(const X509_REQ *req)

{

    if (req == NULL)

        return NULL;

    return X509_PUBKEY_get0(req->req_info.pubkey);

}

X509_PUBKEY *X509_REQ_get_X509_PUBKEY(const X509_REQ *req)

{

    return req->req_info.pubkey;

}

int X509_REQ_check_private_key(const X509_REQ *req, EVP_PKEY *pkey)

{

    return ossl_x509_check_private_key(X509_REQ_get0_pubkey(req), pkey);

}

/*

 * It seems several organisations had the same idea of including a list of

 * extensions in a certificate request. There are at least two OIDs that are

 * used and there may be more: so the list is configurable.

 */

static int ext_nid_list[] = { NID_ext_req, NID_ms_ext_req, NID_undef };

static int *ext_nids = ext_nid_list;

int X509_REQ_extension_nid(int req_nid)

{

    int i, nid;

    for (i = 0;; i++) {

        nid = ext_nids[i];

        if (nid == NID_undef)

            return 0;

        else if (req_nid == nid)

            return 1;

    }

}

int *X509_REQ_get_extension_nids(void)

{

    return ext_nids;

}

void X509_REQ_set_extension_nids(int *nids)

{

    ext_nids = nids;

}

STACK_OF(X509_EXTENSION) *

ossl_x509_req_get1_extensions_by_nid(const X509_REQ *req, int nid)

{

    X509_ATTRIBUTE *attr;

    const ASN1_TYPE *ext = NULL;

    const unsigned char *p;

    int idx = X509_REQ_get_attr_by_NID(req, nid, -1);

    if (idx < 0) /* no extensions is not an error */

        return sk_X509_EXTENSION_new_null();

    attr = X509_REQ_get_attr(req, idx);

    ext = X509_ATTRIBUTE_get0_type(attr, 0);

    if (ext == NULL || ext->type != V_ASN1_SEQUENCE) {

        ERR_raise(ERR_LIB_X509, X509_R_WRONG_TYPE);

        return NULL;

    }

    p = ext->value.sequence->data;

    return (STACK_OF(X509_EXTENSION) *)

        ASN1_item_d2i(NULL, &p, ext->value.sequence->length,

            ASN1_ITEM_rptr(X509_EXTENSIONS));

}

STACK_OF(X509_EXTENSION) *X509_REQ_get_extensions(const X509_REQ *req)

{

    STACK_OF(X509_EXTENSION) *exts = NULL;

    int *pnid;

    if (req == NULL || ext_nids == NULL)

        return NULL;

    for (pnid = ext_nids; *pnid != NID_undef; pnid++) {

        exts = ossl_x509_req_get1_extensions_by_nid(req, *pnid);

        if (exts == NULL)

            return NULL;

        if (sk_X509_EXTENSION_num(exts) > 0)

            return exts;

        sk_X509_EXTENSION_free(exts);

    }

    /* no extensions is not an error */

    return sk_X509_EXTENSION_new_null();

}

/*

 * Add a STACK_OF extensions to a certificate request: allow alternative OIDs

 * in case we want to create a non standard one.

 */

int X509_REQ_add_extensions_nid(X509_REQ *req,

    const STACK_OF(X509_EXTENSION) *exts, int nid)

{

    int extlen;

    int rv = 0;

    unsigned char *ext = NULL;

    STACK_OF(X509_EXTENSION) *mod_exts = NULL;

    int loc;

    if (sk_X509_EXTENSION_num(exts) <= 0)

        return 1; /* adding NULL or empty list of exts is a no-op */

    loc = X509at_get_attr_by_NID(req->req_info.attributes, nid, -1);

    if (loc != -1) {

        if ((mod_exts = ossl_x509_req_get1_extensions_by_nid(req, nid)) == NULL)

            return 0;

        if (X509v3_add_extensions(&mod_exts, exts) == NULL)

            goto end;

    }

    /* Generate encoding of extensions */

    extlen = ASN1_item_i2d((const ASN1_VALUE *)(mod_exts == NULL ? exts : mod_exts),

        &ext, ASN1_ITEM_rptr(X509_EXTENSIONS));

    if (extlen <= 0)

        goto end;

    if (mod_exts != NULL) {

        X509_ATTRIBUTE *att = X509at_delete_attr(req->req_info.attributes, loc);

        if (att == NULL)

            goto end;

        X509_ATTRIBUTE_free(att);

    }

    rv = X509_REQ_add1_attr_by_NID(req, nid, V_ASN1_SEQUENCE, ext, extlen);

    OPENSSL_free(ext);

end:

    sk_X509_EXTENSION_pop_free(mod_exts, X509_EXTENSION_free);

    return rv;

}

/* This is the normal usage: use the "official" OID */

int X509_REQ_add_extensions(X509_REQ *req, const STACK_OF(X509_EXTENSION) *exts)

{

    return X509_REQ_add_extensions_nid(req, exts, NID_ext_req);

}

/* Request attribute functions */

int X509_REQ_get_attr_count(const X509_REQ *req)

{

    return X509at_get_attr_count(req->req_info.attributes);

}

int X509_REQ_get_attr_by_NID(const X509_REQ *req, int nid, int lastpos)

{

    return X509at_get_attr_by_NID(req->req_info.attributes, nid, lastpos);

}

int X509_REQ_get_attr_by_OBJ(const X509_REQ *req, const ASN1_OBJECT *obj,

    int lastpos)

{

    return X509at_get_attr_by_OBJ(req->req_info.attributes, obj, lastpos);

}

X509_ATTRIBUTE *X509_REQ_get_attr(const X509_REQ *req, int loc)

{

    return X509at_get_attr(req->req_info.attributes, loc);

}

X509_ATTRIBUTE *X509_REQ_delete_attr(X509_REQ *req, int loc)

{

    X509_ATTRIBUTE *attr;

    if (req == NULL) {

        ERR_raise(ERR_LIB_X509, ERR_R_PASSED_NULL_PARAMETER);

        return NULL;

    }

    attr = X509at_delete_attr(req->req_info.attributes, loc);

    if (attr != NULL)

        req->req_info.enc.modified = 1;

    return attr;

}

int X509_REQ_add1_attr(X509_REQ *req, X509_ATTRIBUTE *attr)

{

    if (req == NULL) {

        ERR_raise(ERR_LIB_X509, ERR_R_PASSED_NULL_PARAMETER);

        return 0;

    }

    if (!X509at_add1_attr(&req->req_info.attributes, attr))

        return 0;

    req->req_info.enc.modified = 1;

    return 1;

}

int X509_REQ_add1_attr_by_OBJ(X509_REQ *req,

    const ASN1_OBJECT *obj, int type,

    const unsigned char *bytes, int len)

{

    if (req == NULL) {

        ERR_raise(ERR_LIB_X509, ERR_R_PASSED_NULL_PARAMETER);

        return 0;

    }

    if (!X509at_add1_attr_by_OBJ(&req->req_info.attributes, obj,

            type, bytes, len))

        return 0;

    req->req_info.enc.modified = 1;

    return 1;

}

int X509_REQ_add1_attr_by_NID(X509_REQ *req,

    int nid, int type,

    const unsigned char *bytes, int len)

{

    if (req == NULL) {

        ERR_raise(ERR_LIB_X509, ERR_R_PASSED_NULL_PARAMETER);

        return 0;

    }

    if (!X509at_add1_attr_by_NID(&req->req_info.attributes, nid,

            type, bytes, len))

        return 0;

    req->req_info.enc.modified = 1;

    return 1;

}

int X509_REQ_add1_attr_by_txt(X509_REQ *req,

    const char *attrname, int type,

    const unsigned char *bytes, int len)

{

    if (req == NULL) {

        ERR_raise(ERR_LIB_X509, ERR_R_PASSED_NULL_PARAMETER);

        return 0;

    }

    if (!X509at_add1_attr_by_txt(&req->req_info.attributes, attrname,

            type, bytes, len))

        return 0;

    req->req_info.enc.modified = 1;

    return 1;

}

long X509_REQ_get_version(const X509_REQ *req)

{

    return ASN1_INTEGER_get(req->req_info.version);

}

const X509_NAME *X509_REQ_get_subject_name(const X509_REQ *req)

{

    return req->req_info.subject;

}

void X509_REQ_get0_signature(const X509_REQ *req, const ASN1_BIT_STRING **psig,

    const X509_ALGOR **palg)

{

    if (psig != NULL)

        *psig = req->signature;

    if (palg != NULL)

        *palg = &req->sig_alg;

}

void X509_REQ_set0_signature(X509_REQ *req, ASN1_BIT_STRING *psig)

{

    if (req->signature)

        ASN1_BIT_STRING_free(req->signature);

    req->signature = psig;

}

int X509_REQ_set1_signature_algo(X509_REQ *req, X509_ALGOR *palg)

{

    return X509_ALGOR_copy(&req->sig_alg, palg);

}

int X509_REQ_get_signature_nid(const X509_REQ *req)

{

    return OBJ_obj2nid(req->sig_alg.algorithm);

}

int i2d_re_X509_REQ_tbs(X509_REQ *req, unsigned char **pp)

{

    if (req == NULL) {

        ERR_raise(ERR_LIB_X509, ERR_R_PASSED_NULL_PARAMETER);

        return 0;

    }

    req->req_info.enc.modified = 1;

    return i2d_X509_REQ_INFO(&req->req_info, pp);

}