文章目录
openssl3.2 - 官方demo学习 - server-conf.c
概述
建立TLS服务器, 参数从配置文件中来.通过SSL_CONF_CTX_set_flags()来决定读那些TLS参数
遍历配置文件, 通过SSL_CONF_cmd()来读取预期的配置项.
如果不是TLS直接用的参数(e.g. BIO), 自己从配置文件Item中赋值到变量.
笔记
c
/*!
\file server-conf.c
\brief 建立TLS服务器, 参数从配置文件中来.通过SSL_CONF_CTX_set_flags()来决定读那些TLS参数
遍历配置文件, 通过SSL_CONF_cmd()来读取预期的配置项.
如果不是TLS直接用的参数(e.g. BIO), 自己从配置文件Item中赋值到变量.
*/
/*
* Copyright 2013-2017 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
*/
/*
* A minimal program to serve an SSL connection. It uses blocking. It uses
* the SSL_CONF API with a configuration file. cc -I../../include saccept.c
* -L../.. -lssl -lcrypto -ldl
*/
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <openssl/conf.h>
#include "my_openSSL_lib.h"
int main(int argc, char *argv[])
{
char *psz_port = "*:4433";
BIO *bio_in = NULL;
BIO *bio_ssl, *bio_tmp;
SSL_CTX *ctx_ssl;
SSL_CONF_CTX *ctx_ssl_cfg = NULL;
CONF *conf = NULL;
STACK_OF(CONF_VALUE) *sk_of_conf_value = NULL;
CONF_VALUE *conf_value;
long errline = -1;
char buf[512];
int ret = EXIT_FAILURE, i;
int iCfgItemCnt = 0;
ctx_ssl = SSL_CTX_new(TLS_server_method());
conf = NCONF_new(NULL);
if (NCONF_load(conf, "accept.cnf", &errline) <= 0) {
if (errline <= 0)
fprintf(stderr, "Error processing config file\n");
else
fprintf(stderr, "Error on line %ld\n", errline);
goto err;
}
sk_of_conf_value = NCONF_get_section(conf, "default");
if (sk_of_conf_value == NULL) {
fprintf(stderr, "Error retrieving default section\n");
goto err;
}
ctx_ssl_cfg = SSL_CONF_CTX_new();
// 如果需要SSL_CONF_cmd处理的配置项, 先设置标志, 告诉 SSL_CONF_cmd需要从配置文件中读什么预想的配置项名称
SSL_CONF_CTX_set_flags(ctx_ssl_cfg, SSL_CONF_FLAG_SERVER);
SSL_CONF_CTX_set_flags(ctx_ssl_cfg, SSL_CONF_FLAG_CERTIFICATE);
SSL_CONF_CTX_set_flags(ctx_ssl_cfg, SSL_CONF_FLAG_FILE);
SSL_CONF_CTX_set_ssl_ctx(ctx_ssl_cfg, ctx_ssl);
iCfgItemCnt = sk_CONF_VALUE_num(sk_of_conf_value);
for (i = 0; i < iCfgItemCnt; i++) {
int rv;
conf_value = sk_CONF_VALUE_value(sk_of_conf_value, i);
rv = SSL_CONF_cmd(ctx_ssl_cfg, conf_value->name, conf_value->value);
if (rv > 0)
{
/*! 如果是SSL配置项中指定的配置, 就会处理为true */
continue;
}
/*! 如果是非法的配置项名称, 就会报错 */
if (rv != -2) {
fprintf(stderr, "Error processing %s = %s\n",
conf_value->name, conf_value->value);
ERR_print_errors_fp(stderr);
goto err;
}
/*! 如果是合法的配置名称, 又不是SSL配置中需要的项目, 需要自己单独处理 */
if (strcmp(conf_value->name, "Port") == 0) {
psz_port = conf_value->value;
} else {
fprintf(stderr, "Unknown configuration option %s\n", conf_value->name);
/*! 如果不是预想的配置名称, 需要继续遍历(多行时, 预想的配置项可能没写在第一行), 而不是报错退出 */
// goto err;
}
}
if (!SSL_CONF_CTX_finish(ctx_ssl_cfg)) {
fprintf(stderr, "Finish error\n");
ERR_print_errors_fp(stderr);
goto err;
}
/* Setup server side SSL bio */
bio_ssl = BIO_new_ssl(ctx_ssl, 0);
if ((bio_in = BIO_new_accept(psz_port)) == NULL)
goto err;
/*
* This means that when a new connection is accepted on 'in', The ssl_bio
* will be 'duplicated' and have the new socket BIO push into it.
* Basically it means the SSL BIO will be automatically setup
*/
BIO_set_accept_bios(bio_in, bio_ssl);
again:
/*
* The first call will setup the accept socket, and the second will get a
* socket. In this loop, the first actual accept will occur in the
* BIO_read() function.
*/
if (BIO_do_accept(bio_in) <= 0)
goto err;
for (;;) {
i = BIO_read(bio_in, buf, 512); /*! 阻塞等待客户端来连接 */
if (i == 0) {
/*
* If we have finished, remove the underlying BIO stack so the
* next time we call any function for this BIO, it will attempt
* to do an accept
*/
printf("Done\n");
bio_tmp = BIO_pop(bio_in);
BIO_free_all(bio_tmp);
goto again;
}
if (i < 0) {
if (BIO_should_retry(bio_in))
continue;
goto err;
}
fwrite(buf, 1, i, stdout);
fflush(stdout);
}
ret = EXIT_SUCCESS;
err:
if (ret != EXIT_SUCCESS)
ERR_print_errors_fp(stderr);
BIO_free(bio_in);
return ret;
}