安全通信系统--OpenSSL服务器和客户端

//创建监听套接字
sListen = socket (AF_INET, SOCK_STREAM, 0);
if(sListen == INVALID_SOCKET)
{
cout << "监听套接字创建失败" << endl;
exit(0);
}
//创建地址
sockaddr_in sin = {0};
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_port = htons (PORT);

//套接字绑定
err = bind(sListen, (struct sockaddr*) &sin,sizeof(sin));
if(err == -1)
{
cout << "监听套接字绑定失败" << endl;
exit(0);
}

/*接受TCP链接*/
err = listen (sListen, 5);
if(err == -1)
{
cout << "监听套接字开启监听失败" << endl;
exit(0);
}

//接受客户端连接
SOCKET sd = accept(sListen, (struct sockaddr *)&sa_cli, (socklen_t*)&client_len);

if(err == -1)
{
cout << "监听套接字accept失败" << endl;
exit(0);
}
closesocket (sListen);

/*TCP连接已建立,进行服务端的SSL过程. */
cout << "TCP连接建立，创建SSL连接中....\n" << endl;
//从初始化的ctx新建SSL
ssl = SSL_new (ctx);
if(ssl == NULL)
{
cout << "SSL创建失败" << endl;
exit(0);
}
//套接字和SSL绑定
SSL_set_fd (ssl, sd);
//SSL连接建立
err = SSL_accept (ssl);
if(err == -1)
{
cout << "创建SSL连接失败" << endl;
exit(0);
}
else
{
cout << "创建SSL连接成功" << endl;
exit(0);
}

/*打印所有加密算法的信息(可选)*/
cout << "SSL连接算法信息:" << SL_get_cipher (ssl) << endl;

/*得到服务端的证书并打印些信息(可选) */
client_cert = SSL_get_peer_certificate (ssl);
if (client_cert != NULL) {
cout << "客户端证书:" << endl;

cout << "subject:" << X509_get_subject_name (client_cert), 0, 0) << endl;

cout << "issuer:" << X509_NAME_oneline (X509_get_issuer_name (client_cert),0,0) << endl;
CHK_NULL(str);
X509_free (client_cert);/*如不再需要,需将证书释放 */
}
else cout << "客户端没有证书信息！" << endl; //客户端认证失败

//SSL通信，用SSL_write,SSL_read代替send和recv
while(true)
{
//接收消息
err = SSL_read (ssl, buf, sizeof(buf) - 1);
if(err == -1)
{
cout << "SSL_read接收消息失败" << endl;
exit(0);
}
buf[err] = '\0';
cout << "【客户端】:" << buf << endl;

cin >> buf;
//发送消息
err = SSL_write(ssl, buf, strlen(ssl));
if(err == -1)
{
cout << "SSL_write发送消息失败" << endl;
exit(0);
}
cout << "【服务器】:" << buf << endl;
}

//关闭套接字和ssl
shutdown (sd,2);
SSL_free (ssl);
SSL_CTX_free (ctx);

//
#include "openssl/rsa.h"
#include "openssl/crypto.h"
#include "openssl/x509.h"
#include "openssl/pem.h"
#include "openssl/ssl.h"
#include "openssl/err.h"
#include "openssl/rand.h"

#pragma comment(lib, "libeay32.lib")
#pragma comment(lib, "ssleay32.lib")

/*所有需要的参数信息都在此处以#define的形式提供*/

#define CERTF "C:\\client.crt" /*服务端的证书(需经CA签名)*/
#define KEYF "C:\\client.key" /*服务端的私钥(建议加密存储)*/
#define CACERT "C:\\ca.crt" /*CA 的证书*/
#define PORT 7758 /*服务端的端口*/

int main ()
{
int err;

int sd;
struct sockaddr_in sa;
SSL_CTX* ctx;
SSL* ssl;
X509* server_cert;
char* str;
char buf [4096] = {0};
char szMsg[4096] = {0};
//SSL_METHOD *meth;
int seed_int[100]; /*存放随机序列*/

WSADATA wsaData;

if(WSAStartup(MAKEWORD(2,2),&wsaData) != 0){
printf("WSAStartup()fail:%d\n",GetLastError());
return -1;
}

OpenSSL_add_ssl_algorithms(); /*初始化*/
SSL_load_error_strings(); /*为打印调试信息作准备*/

//注意这里是client和和服务器不同
ctx = SSL_CTX_new (TLSv1_client_method());
CHK_NULL(ctx);

SSL_CTX_set_verify(ctx,SSL_VERIFY_PEER,NULL); /*验证与否*/
SSL_CTX_load_verify_locations(ctx,CACERT,NULL); /*若验证,则放置CA证书*/

if (SSL_CTX_use_certificate_file(ctx, CERTF, SSL_FILETYPE_PEM) <= 0)
{
cout << "客户端证书检查失败！" << endl;
exit(0);
}

if (SSL_CTX_use_PrivateKey_file(ctx, KEYF, SSL_FILETYPE_PEM) <= 0)
{
cout << "客户端key检查失败！" << endl;
exit(0);
}

if (!SSL_CTX_check_private_key(ctx))
{
cout << "客户端证书和key不匹配！" << endl;
exit(0);
}

/*构建随机数生成机制,WIN32平台必需*/
srand( (unsigned)time( NULL ) );
for( int i = 0; i < 100;i++ ) seed_int[i] = rand();

RAND_seed(seed_int, sizeof(seed_int));

//创建TCP连接请求
sd = socket (AF_INET, SOCK_STREAM, 0);
if(sd == INVALID_SOCKET)
{
cout << "套接字创建失败！" << endl;
exit(0);
}
memset(&sa,'\0', sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = inet_addr ("127.0.0.1");
sa.sin_port = htons (PORT); /* Server Port number */

//TCP连接
err = connect(sd, (struct sockaddr*) &sa,
if(err == -1)
{
cout << "TCP连接失败！" << endl;
exit(0);
}
else
{
cout << "SSL连接成功！" << endl;
exit(0);
}
//SSL连接
//新建SSL
ssl = SSL_new (ctx);
if(ssl == NULL)
{
cout << "新建SSL失败!" << endl;
exit(0);
}
//套接字和SSL绑定
SSL_set_fd (ssl, sd);
//SLL连接
err = SSL_connect (ssl);
if(err == -1)
{
cout << "SSL连接失败" << endl;
exit(0);
}
else
{
cout << "SSL连接成功" << endl;
exit(0);
}
//打印连接信息
cout << "SSL连接算法信息：" << SSL_get_cipher (ssl) << endl;

/*得到服务端的证书并打印些信息(可选) */
server_cert = SSL_get_peer_certificate (ssl);
if (server_cert != NULL) {
cout << "服务器证书:" << endl;

cout << "subject:" << X509_get_subject_name (server_cert), 0, 0) << endl;

cout << "issuer:" << X509_NAME_oneline (X509_get_issuer_name (server_cert),0,0) << endl;
CHK_NULL(str);
X509_free (server_cert);/*如不再需要,需将证书释放 */
}
else cout << "服务器没有证书信息！" << endl; //服务器端认证失败

//SSL通信，用SSL_write,SSL_read代替send和recv
while(true)
{
cout << "请输入要发送的消息:";
cin >> buf;
//发送消息
err = SSL_write(ssl, buf, strlen(ssl));
if(err == -1)
{
cout << "SSL_write发送消息失败" << endl;
exit(0);
}
cout << "【客户端】:" << buf << endl;
//接收消息
err = SSL_read (ssl, buf, sizeof(buf) - 1);
if(err == -1)
{
cout << "SSL_read接收消息失败" << endl;
exit(0);
}
buf[err] = '\0';
cout << "【服务器】:" << buf << endl;
}

/* 收尾工作 */
SSL_shutdown (ssl);
shutdown (sd,2);
SSL_free (ssl);
SSL_CTX_free (ctx);

return 0;
}