/*

 * Copyright 1999-2021 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/conf.h>

#include <openssl/asn1.h>

#include <openssl/asn1t.h>

#include <openssl/x509v3.h>

#include "ext_dat.h"

static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,

                                                 AUTHORITY_KEYID *akeyid,

                                                 STACK_OF(CONF_VALUE)

                                                 *extlist);

static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,

                                            X509V3_CTX *ctx,

                                            STACK_OF(CONF_VALUE) *values);

const X509V3_EXT_METHOD v3_akey_id = {

    NID_authority_key_identifier,

    X509V3_EXT_MULTILINE, ASN1_ITEM_ref(AUTHORITY_KEYID),

    0, 0, 0, 0,

    0, 0,

    (X509V3_EXT_I2V) i2v_AUTHORITY_KEYID,

    (X509V3_EXT_V2I)v2i_AUTHORITY_KEYID,

    0, 0,

    NULL

};

static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,

                                                 AUTHORITY_KEYID *akeyid,

                                                 STACK_OF(CONF_VALUE)

                                                 *extlist)

{

    char *tmp = NULL;

    STACK_OF(CONF_VALUE) *origextlist = extlist, *tmpextlist;

    if (akeyid->keyid) {

        tmp = OPENSSL_buf2hexstr(akeyid->keyid->data, akeyid->keyid->length);

        if (tmp == NULL) {

            X509V3err(X509V3_F_I2V_AUTHORITY_KEYID, ERR_R_MALLOC_FAILURE);

            return NULL;

        }

        if (!X509V3_add_value("keyid", tmp, &extlist)) {

            OPENSSL_free(tmp);

            X509V3err(X509V3_F_I2V_AUTHORITY_KEYID, ERR_R_X509_LIB);

            goto err;

        }

        OPENSSL_free(tmp);

    }

    if (akeyid->issuer) {

        tmpextlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer, extlist);

        if (tmpextlist == NULL) {

            X509V3err(X509V3_F_I2V_AUTHORITY_KEYID, ERR_R_X509_LIB);

            goto err;

        }

        extlist = tmpextlist;

    }

    if (akeyid->serial) {

        tmp = OPENSSL_buf2hexstr(akeyid->serial->data, akeyid->serial->length);

        if (tmp == NULL) {

            X509V3err(X509V3_F_I2V_AUTHORITY_KEYID, ERR_R_MALLOC_FAILURE);

            goto err;

        }

        if (!X509V3_add_value("serial", tmp, &extlist)) {

            OPENSSL_free(tmp);

            X509V3err(X509V3_F_I2V_AUTHORITY_KEYID, ERR_R_X509_LIB);

            goto err;

        }

        OPENSSL_free(tmp);

    }

    return extlist;

 err:

    if (origextlist == NULL)

        sk_CONF_VALUE_pop_free(extlist, X509V3_conf_free);

    return NULL;

}

/*-

 * Currently two options:

 * keyid: use the issuers subject keyid, the value 'always' means its is

 * an error if the issuer certificate doesn't have a key id.

 * issuer: use the issuers cert issuer and serial number. The default is

 * to only use this if keyid is not present. With the option 'always'

 * this is always included.

 */

static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,

                                            X509V3_CTX *ctx,

                                            STACK_OF(CONF_VALUE) *values)

{

    char keyid = 0, issuer = 0;

    int i;

    CONF_VALUE *cnf;

    ASN1_OCTET_STRING *ikeyid = NULL;

    X509_NAME *isname = NULL;

    GENERAL_NAMES *gens = NULL;

    GENERAL_NAME *gen = NULL;

    ASN1_INTEGER *serial = NULL;

    X509_EXTENSION *ext;

    X509 *cert;

    AUTHORITY_KEYID *akeyid;

    for (i = 0; i < sk_CONF_VALUE_num(values); i++) {

        cnf = sk_CONF_VALUE_value(values, i);

        if (strcmp(cnf->name, "keyid") == 0) {

            keyid = 1;

            if (cnf->value && strcmp(cnf->value, "always") == 0)

                keyid = 2;

        } else if (strcmp(cnf->name, "issuer") == 0) {

            issuer = 1;

            if (cnf->value && strcmp(cnf->value, "always") == 0)

                issuer = 2;

        } else {

            X509V3err(X509V3_F_V2I_AUTHORITY_KEYID, X509V3_R_UNKNOWN_OPTION);

            ERR_add_error_data(2, "name=", cnf->name);

            return NULL;

        }

    }

    if (!ctx || !ctx->issuer_cert) {

        if (ctx && (ctx->flags == CTX_TEST))

            return AUTHORITY_KEYID_new();

        X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,

                  X509V3_R_NO_ISSUER_CERTIFICATE);

        return NULL;

    }

    cert = ctx->issuer_cert;

    if (keyid) {

        i = X509_get_ext_by_NID(cert, NID_subject_key_identifier, -1);

        if ((i >= 0) && (ext = X509_get_ext(cert, i)))

            ikeyid = X509V3_EXT_d2i(ext);

        if (keyid == 2 && !ikeyid) {

            X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,

                      X509V3_R_UNABLE_TO_GET_ISSUER_KEYID);

            return NULL;

        }

    }

    if ((issuer && !ikeyid) || (issuer == 2)) {

        isname = X509_NAME_dup(X509_get_issuer_name(cert));

        serial = ASN1_INTEGER_dup(X509_get_serialNumber(cert));

        if (!isname || !serial) {

            X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,

                      X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS);

            goto err;

        }

    }

    if ((akeyid = AUTHORITY_KEYID_new()) == NULL)

        goto err;

    if (isname) {

        if ((gens = sk_GENERAL_NAME_new_null()) == NULL

            || (gen = GENERAL_NAME_new()) == NULL

            || !sk_GENERAL_NAME_push(gens, gen)) {

            X509V3err(X509V3_F_V2I_AUTHORITY_KEYID, ERR_R_MALLOC_FAILURE);

            goto err;

        }

        gen->type = GEN_DIRNAME;

        gen->d.dirn = isname;

    }

    akeyid->issuer = gens;

    gen = NULL;

    gens = NULL;

    akeyid->serial = serial;

    akeyid->keyid = ikeyid;

    return akeyid;

 err:

    sk_GENERAL_NAME_free(gens);

    GENERAL_NAME_free(gen);

    X509_NAME_free(isname);

    ASN1_INTEGER_free(serial);

    ASN1_OCTET_STRING_free(ikeyid);

    return NULL;

}