/* 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.
 */

/*                      _             _
 *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
 * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
 * | | | | | | (_) | (_| |   \__ \__ \ |
 * |_| |_| |_|\___/ \__,_|___|___/___/_|
 *                      |_____|
 *  ssl_engine_log.c
 *  Logging Facility
 */
                             /* ``The difference between a computer
                                  industry job and open-source software
                                  hacking is about 30 hours a week.''
                                         -- Ralf S. Engelschall     */
#include "mod_ssl.h"

/*  _________________________________________________________________
**
**  Logfile Support
**  _________________________________________________________________
*/

static const struct {
    const char *cpPattern;
    const char *cpAnnotation;
} ssl_log_annotate[] = {
    { "*envelope*bad*decrypt*", "wrong pass phrase!?" },
    { "*CLIENT_HELLO*unknown*protocol*", "speaking not SSL to HTTPS port!?" },
    { "*CLIENT_HELLO*http*request*", "speaking HTTP to HTTPS port!?" },
    { "*SSL3_READ_BYTES:sslv3*alert*bad*certificate*", "Subject CN in certificate not server name or identical to CA!?" },
    { "*self signed certificate in certificate chain*", "Client certificate signed by CA not known to server?" },
    { "*peer did not return a certificate*", "No CAs known to server for verification?" },
    { "*no shared cipher*", "Too restrictive SSLCipherSuite or using DSA server certificate?" },
    { "*no start line*", "Bad file contents or format - or even just a forgotten SSLCertificateKeyFile?" },
    { "*bad password read*", "You entered an incorrect pass phrase!?" },
    { "*bad mac decode*", "Browser still remembered details of a re-created server certificate?" },
    { NULL, NULL }
};

static const char *ssl_log_annotation(const char *error)
{
    int i = 0;

    while (ssl_log_annotate[i].cpPattern != NULL 
           && ap_strcmp_match(error, ssl_log_annotate[i].cpPattern) != 0)
        i++;

    return ssl_log_annotate[i].cpAnnotation;
}

void ssl_die(void)
{
    /*
     * This is used for fatal errors and here
     * it is common module practice to really
     * exit from the complete program.
     */
    exit(1);
}

/*
 * Prints the SSL library error information.
 */
void ssl_log_ssl_error(const char *file, int line, int level, server_rec *s)
{
    unsigned long e;

    while ((e = ERR_get_error())) {
        const char *annotation;
        char err[256];

        ERR_error_string_n(e, err, sizeof err);
        annotation = ssl_log_annotation(err);

        if (annotation) {
            ap_log_error(file, line, level, 0, s,
                         "SSL Library Error: %lu %s %s",
                         e, err, annotation); 
        }
        else {
            ap_log_error(file, line, level, 0, s,
                         "SSL Library Error: %lu %s",
                         e, err); 
        }
    }
}
