/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @verbatim
                        _             _
    _ __ ___   ___   __| |    ___ ___| |  mod_ssl
   | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
   | | | | | | (_) | (_| |   \__ \__ \ |
   |_| |_| |_|\___/ \__,_|___|___/___/_|
                        |_____|
   @endverbatim
 * @file  ssl_util_ssl.h
 * @brief Additional Utility Functions for OpenSSL
 *
 * @defgroup MOD_SSL_UTIL Utilities
 * @ingroup MOD_SSL
 * @{
 */

#ifndef __SSL_UTIL_SSL_H__
#define __SSL_UTIL_SSL_H__

/**
 * SSL library version number
 */

#define MODSSL_LIBRARY_VERSION OPENSSL_VERSION_NUMBER
#define MODSSL_LIBRARY_NAME    "OpenSSL"
#define MODSSL_LIBRARY_TEXT    OPENSSL_VERSION_TEXT
#if MODSSL_USE_OPENSSL_PRE_1_1_API
#define MODSSL_LIBRARY_DYNTEXT SSLeay_version(SSLEAY_VERSION)
#else
#define MODSSL_LIBRARY_DYNTEXT OpenSSL_version(OPENSSL_VERSION)
#endif

/**
 *  Maximum length of a DER encoded session.
 *  FIXME: There is no define in OpenSSL, but OpenSSL uses 1024*10,
 *         so this value should be ok. Although we have no warm feeling.
 */
#define MODSSL_SESSION_MAX_DER 1024*10

/** max length for modssl_SSL_SESSION_id2sz */
#define MODSSL_SESSION_ID_STRING_LEN \
    ((SSL_MAX_SSL_SESSION_ID_LENGTH + 1) * 2)

/**
 *  Additional Functions
 */
void        modssl_init_app_data2_idx(void);
void       *modssl_get_app_data2(SSL *);
void        modssl_set_app_data2(SSL *, void *);

/* Read private key from filename in either PEM or raw base64(DER)
 * format, using password entry callback cb and userdata. */
EVP_PKEY   *modssl_read_privatekey(const char *filename, pem_password_cb *cb, void *ud);

int         modssl_smart_shutdown(SSL *ssl);
BOOL        modssl_X509_getBC(X509 *, int *, int *);
char       *modssl_X509_NAME_ENTRY_to_string(apr_pool_t *p, const X509_NAME_ENTRY *xsne,
                                             int raw);
char       *modssl_X509_NAME_to_string(apr_pool_t *, const X509_NAME *, int);
BOOL        modssl_X509_getSAN(apr_pool_t *, X509 *, int, const char *, int, apr_array_header_t **);
BOOL        modssl_X509_match_name(apr_pool_t *, X509 *, const char *, BOOL, server_rec *);
char       *modssl_SSL_SESSION_id2sz(IDCONST unsigned char *, int, char *, int);

/* Convert ASN.1 string to a pool-allocated char * string, escaping
 * control characters.  If raw is zero, convert to UTF-8, otherwise
 * unchanged from the character set. */
char *modssl_ASN1_STRING_convert(apr_pool_t *p, const ASN1_STRING *asn1str,
                                 int raw);

/* Reads the remaining data in BIO, if not empty, and copies it into a
 * pool-allocated string.  If empty, returns NULL.  BIO_free(bio) is
 * called for both cases. */
char *modssl_bio_free_read(apr_pool_t *p, BIO *bio);

/* Read a single certificate and its private key from the given string in PEM format.
 * If `key_pem` is NULL, it will expect the key in `cert_pem`.
 */
apr_status_t modssl_read_cert(apr_pool_t *p, 
                              const char *cert_pem, const char *key_pem,
                              pem_password_cb *cb, void *ud, 
                              X509 **pcert, EVP_PKEY **pkey);

/* Convert a certificate (and optionally a second) into a PEM string.
 * @param p pool for allocations
 * @param cert1 the certificate to convert
 * @param cert2 a second cert to add to the PEM afterwards or NULL.
 * @param ppem the certificate(s) in PEM format, NUL-terminated.
 * @return APR_SUCCESS if ppem is valid.
 */
apr_status_t modssl_cert_get_pem(apr_pool_t *p,
                                 X509 *cert1, X509 *cert2,
                                 const char **ppem);

#endif /* __SSL_UTIL_SSL_H__ */
/** @} */

