/*

 * Copyright 1995-2022 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (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(X509 *x, EVP_PKEY *pkey, const EVP_MD *md)

{

    X509_REQ *ret;

    X509_REQ_INFO *ri;

    int i;

    EVP_PKEY *pktmp;

    ret = X509_REQ_new();

    if (ret == NULL) {

        X509err(X509_F_X509_TO_X509_REQ, ERR_R_MALLOC_FAILURE);

        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(X509_REQ *req)

{

    if (req == NULL)

        return NULL;

    return X509_PUBKEY_get0(req->req_info.pubkey);

}

X509_PUBKEY *X509_REQ_get_X509_PUBKEY(X509_REQ *req)

{

    return req->req_info.pubkey;

}

int X509_REQ_check_private_key(X509_REQ *x, EVP_PKEY *k)

{

    EVP_PKEY *xk = NULL;

    int ok = 0;

    xk = X509_REQ_get_pubkey(x);

    switch (EVP_PKEY_cmp(xk, k)) {

    case 1:

        ok = 1;

        break;

    case 0:

        X509err(X509_F_X509_REQ_CHECK_PRIVATE_KEY,

                X509_R_KEY_VALUES_MISMATCH);

        break;

    case -1:

        X509err(X509_F_X509_REQ_CHECK_PRIVATE_KEY, X509_R_KEY_TYPE_MISMATCH);

        break;

    case -2:

#ifndef OPENSSL_NO_EC

        if (EVP_PKEY_id(k) == EVP_PKEY_EC) {

            X509err(X509_F_X509_REQ_CHECK_PRIVATE_KEY, ERR_R_EC_LIB);

            break;

        }

#endif

#ifndef OPENSSL_NO_DH

        if (EVP_PKEY_id(k) == EVP_PKEY_DH) {

            /* No idea */

            X509err(X509_F_X509_REQ_CHECK_PRIVATE_KEY,

                    X509_R_CANT_CHECK_DH_KEY);

            break;

        }

#endif

        X509err(X509_F_X509_REQ_CHECK_PRIVATE_KEY, X509_R_UNKNOWN_KEY_TYPE);

    }

    EVP_PKEY_free(xk);

    return ok;

}

/*

 * 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) *X509_REQ_get_extensions(X509_REQ *req)

{

    X509_ATTRIBUTE *attr;

    ASN1_TYPE *ext = NULL;

    int idx, *pnid;

    const unsigned char *p;

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

        return NULL;

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

        idx = X509_REQ_get_attr_by_NID(req, *pnid, -1);

        if (idx == -1)

            continue;

        attr = X509_REQ_get_attr(req, idx);

        ext = X509_ATTRIBUTE_get0_type(attr, 0);

        break;

    }

    if (ext == NULL) /* no extensions is not an error */

        return sk_X509_EXTENSION_new_null();

    if (ext->type != V_ASN1_SEQUENCE)

        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));

}

/*

 * 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, STACK_OF(X509_EXTENSION) *exts,

                                int nid)

{

    int extlen;

    int rv = 0;

    unsigned char *ext = NULL;

    /* Generate encoding of extensions */

    extlen = ASN1_item_i2d((ASN1_VALUE *)exts, &ext,

                           ASN1_ITEM_rptr(X509_EXTENSIONS));

    if (extlen <= 0)

        return 0;

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

    OPENSSL_free(ext);

    return rv;

}

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

int X509_REQ_add_extensions(X509_REQ *req, 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 = 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 (!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 (!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 (!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 (!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);

}

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)

{

    req->req_info.enc.modified = 1;

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

}