144 lines
3.6 KiB
C++
144 lines
3.6 KiB
C++
#include <stdio.h>
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#include <stdlib.h>
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#include <memory.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <winsock2.h>
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#include "openssl/rsa.h"
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#include "openssl/crypto.h"
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#include "openssl/x509.h"
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#include "openssl/pem.h"
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#include "openssl/ssl.h"
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#include "openssl/err.h"
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#include "openssl/rand.h"
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#pragma comment(lib,"ws2_32.lib")
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#pragma comment(lib,"libeay32.lib")
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#pragma comment(lib,"ssleay32.lib")
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#define CERTF "client.crt" /*客户端的证书(需经CA签名)*/
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#define KEYF "client.key" /*客户端的私钥(建议加密存储)*/
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#define CACERT "ca.crt" /*CA 的证书*/
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#define PORT 1111 /*服务端的端口*/
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#define SERVER_ADDR "127.0.0.1" /*服务段的IP地址*/
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#define CHK_NULL(x) if ((x)==NULL) exit (-1)
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#define CHK_ERR(err,s) if ((err)==-1) { perror(s); exit(-2); }
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#define CHK_SSL(err) if ((err)==-1) { ERR_print_errors_fp(stderr); exit(-3); }
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int main()
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{
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int err;
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int sd;
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struct sockaddr_in sa;
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SSL_CTX* ctx;
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SSL* ssl;
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X509* server_cert;
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char buf[4096];
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char* str;
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const SSL_METHOD *meth;
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int seed_int[100]; /*存放随机序列*/
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WSADATA wsaData;
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if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
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printf("WSAStartup()fail:%d\n", GetLastError());
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return -1;
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}
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OpenSSL_add_ssl_algorithms(); /*初始化*/
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SSL_load_error_strings(); /*为打印调试信息作准备*/
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meth = TLSv1_client_method(); /*采用什么协议(SSLv2/SSLv3/TLSv1)在此指定*/
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ctx = SSL_CTX_new(meth);
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CHK_NULL(ctx);
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SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL); /*验证与否*/
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SSL_CTX_load_verify_locations(ctx, CACERT, NULL); /*若验证,则放置CA证书*/
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if (SSL_CTX_use_certificate_file(ctx, CERTF, SSL_FILETYPE_PEM) <= 0) {
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ERR_print_errors_fp(stderr);
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exit(-2);
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}
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if (SSL_CTX_use_PrivateKey_file(ctx, KEYF, SSL_FILETYPE_PEM) <= 0) {
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ERR_print_errors_fp(stderr);
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exit(-3);
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}
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if (!SSL_CTX_check_private_key(ctx)) {
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printf("Private key does not match the certificate public key\n");
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exit(-4);
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}
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/*构建随机数生成机制,WIN32平台必需*/
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srand((unsigned)time(NULL));
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for (int i = 0; i < 100; i++)
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seed_int[i] = rand();
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RAND_seed(seed_int, sizeof(seed_int));
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/*以下是正常的TCP socket建立过程 .............................. */
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printf("Begin tcp socket...\n");
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sd = socket(AF_INET, SOCK_STREAM, 0); CHK_ERR(sd, "socket");
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memset(&sa, '\0', sizeof(sa));
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sa.sin_family = AF_INET;
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sa.sin_addr.s_addr = inet_addr(SERVER_ADDR); /* Server IP */
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sa.sin_port = htons(PORT); /* Server Port number */
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err = connect(sd, (struct sockaddr*) &sa,
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sizeof(sa));
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CHK_ERR(err, "connect");
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/* TCP 链接已建立.开始 SSL 握手过程.......................... */
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printf("Begin SSL negotiation \n");
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ssl = SSL_new(ctx);
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CHK_NULL(ssl);
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SSL_set_fd(ssl, sd);
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err = SSL_connect(ssl);
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CHK_SSL(err);
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/*打印所有加密算法的信息(可选)*/
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printf("SSL connection using %s\n", SSL_get_cipher(ssl));
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/*得到服务端的证书并打印些信息(可选) */
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server_cert = SSL_get_peer_certificate(ssl);
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CHK_NULL(server_cert);
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printf("服务器证书是:\n");
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str = X509_NAME_oneline(X509_get_subject_name(server_cert), 0, 0);
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CHK_NULL(str);
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printf("\t subject: %s\n", str);
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//free(str);
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str = X509_NAME_oneline(X509_get_issuer_name(server_cert), 0, 0);
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if (str == NULL)
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printf("issuer null");
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CHK_NULL(str);
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printf("\t issuer: %s\n", str);
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//free(str);
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X509_free(server_cert); /*如不再需要,需将证书释放 */
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/* 数据交换开始,用SSL_write,SSL_read代替write,read */
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printf("Begin SSL data exchange\n");
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err = SSL_write(ssl, "我是客户端", strlen("我是客户端"));
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CHK_SSL(err);
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err = SSL_read(ssl, buf, sizeof(buf) - 1);
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CHK_SSL(err);
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buf[err] = '\0';
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printf("Got %d chars:'%s'\n", err, buf);
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SSL_shutdown(ssl); /* send SSL/TLS close_notify */
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/* 收尾工作 */
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shutdown(sd, 2);
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SSL_free(ssl);
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SSL_CTX_free(ctx);
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system("pause");
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return 0;
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}
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