2017-2018-1 20155206 《信息安全系统设计基础》实验五通讯协议设计
实验一为装OpenSSL，故不多做解释。
要求
、 在Ubuntu中实现对实验二中的“wc服务器”通过混合密码系统进行防护
、 提交测试截图
server
`
include <stdio.h>
include <stdlib.h>
include <errno.h>
include <string.h>
include <sys/types.h>
include <netinet/in.h>
include <sys/socket.h>
include <sys/wait.h>
include <unistd.h>
include <arpa/inet.h>
include <openssl/ssl.h>
include <openssl/err.h>
include <openssl/evp.h>
define MAXBUF 1024
int main(int argc, char **argv)
{
int sockfd, new_fd;
socklen_t len;
struct sockaddr_in my_addr, their_addr;
unsigned int myport, lisnum;
char buf[MAXBUF + 1];
SSL_CTX *ctx;
if (argv[1])
myport = atoi(argv[1]);
else
myport = 7838;
if (argv[2])
lisnum = atoi(argv[2]);
else
lisnum = 2;
/* SSL 库初始化 */
SSL_library_init();
/* 载入所有 SSL 算法 */
OpenSSL_add_all_algorithms();
/* 载入所有 SSL 错误消息 */
SSL_load_error_strings();
/* 以 SSL V2 和 V3 标准兼容方式产生一个 SSL_CTX ，即 SSL Content Text */
ctx = SSL_CTX_new(SSLv23_server_method());
/* 也可以用 SSLv2_server_method() 或 SSLv3_server_method() 单独表示 V2 或 V3标准 */
if (ctx == NULL) {
ERR_print_errors_fp(stdout);
exit(1);
}
/* 载入用户的数字证书， 此证书用来发送给客户端。 证书里包含有公钥 */
if (SSL_CTX_use_certificate_file(ctx, argv[3], SSL_FILETYPE_PEM) <= 0) {
ERR_print_errors_fp(stdout);
exit(1);
}
/* 载入用户私钥 */
if (SSL_CTX_use_PrivateKey_file(ctx, argv[4], SSL_FILETYPE_PEM) <= 0){
ERR_print_errors_fp(stdout);
exit(1);
}
/* 检查用户私钥是否正确 */
if (!SSL_CTX_check_private_key(ctx)) {
ERR_print_errors_fp(stdout);
exit(1);
}
/* 开启一个 socket 监听 */
if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
} else
printf("socket created
");
bzero(&my_addr, sizeof(my_addr));
my_addr.sin_family = PF_INET;
my_addr.sin_port = htons(myport);
my_addr.sin_addr.s_addr = INADDR_ANY;
if (bind(sockfd, (struct sockaddr *) &my_addr, sizeof(struct sockaddr))
== -1) {
perror("bind");
exit(1);
} else
printf("binded
");
if (listen(sockfd, lisnum) == -1) {
perror("listen");
exit(1);
} else
printf("begin listen
");
while (1) {
SSL *ssl;
len = sizeof(struct sockaddr);
/* 等待客户端连上来 */
if ((new_fd =
accept(sockfd, (struct sockaddr *) &their_addr,
&len)) == -1) {
perror("accept");
exit(errno);
} else
printf("server: got connection from %s, port %d, socket %d
",
inet_ntoa(their_addr.sin_addr),
ntohs(their_addr.sin_port), new_fd);
/* 基于 ctx 产生一个新的 SSL */
ssl = SSL_new(ctx);
/* 将连接用户的 socket 加入到 SSL */
SSL_set_fd(ssl, new_fd);
/* 建立 SSL 连接 */
if (SSL_accept(ssl) == -1) {
perror("accept");
close(new_fd);
break;
}
/* 开始处理每个新连接上的数据收发 */
bzero(buf, MAXBUF + 1);
strcpy(buf, "server->client");
/* 发消息给客户端 */
len = SSL_write(ssl, buf, strlen(buf));
if (len <= 0) {
printf
("消息'%s'发送失败！错误代码是%d，错误信息是'%s'
",
buf, errno, strerror(errno));
goto finish;
} else
printf("消息'%s'发送成功，共发送了%d个字节！
",
buf, len);
bzero(buf, MAXBUF + 1);
/* 接收客户端的消息 */
len = SSL_read(ssl, buf, MAXBUF);
if (len > 0)
printf("接收消息成功:'%s'，共%d个字节的数据
",
buf, len);
else
printf
("消息接收失败！错误代码是%d，错误信息是'%s'
",
errno, strerror(errno));
/* 处理每个新连接上的数据收发结束 */
finish:
/* 关闭 SSL 连接 */
SSL_shutdown(ssl);
/* 释放 SSL */
SSL_free(ssl);
/* 关闭 socket */
close(new_fd);
}
/* 关闭监听的 socket */
close(sockfd);
/* 释放 CTX */
SSL_CTX_free(ctx);
return 0;
}
`
telent
`
include <stdio.h>
include <string.h>
include <errno.h>
include <sys/socket.h>
include <resolv.h>
include <stdlib.h>
include <netinet/in.h>
include <arpa/inet.h>
include <unistd.h>
include <openssl/ssl.h>
include <openssl/err.h>
include <openssl/evp.h>
define MAXBUF 1024
void ShowCerts(SSL * ssl)
{
X509 *cert;
char *line;
cert = SSL_get_peer_certificate(ssl);
if (cert != NULL) {
printf("数字证书信息:
");
line = X509_NAME_oneline(X509_get_subject_name(cert), 0, 0);
printf("证书: %s
", line);
free(line);
line = X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0);
printf("颁发者: %s
", line);
free(line);
X509_free(cert);
} else
printf("无证书信息！
");
}
int main(int argc, char **argv)
{
int sockfd, len;
struct sockaddr_in dest;
char buffer[MAXBUF + 1];
SSL_CTX *ctx;
SSL *ssl;
if (argc != 3) {
printf("参数格式错误！正确用法如下：
%s IP地址 端口
比如: %s 127.0.0.1 80
此程序用来从某个"
"IP 地址的服务器某个端口接收最多 MAXBUF 个字节的消息",
argv[0], argv[0]);
exit(0);
}
/* SSL 库初始化，参看 ssl-server.c 代码 */
SSL_library_init();
OpenSSL_add_all_algorithms();
SSL_load_error_strings();
ctx = SSL_CTX_new(SSLv23_client_method());
if (ctx == NULL) {
ERR_print_errors_fp(stdout);
exit(1);
}
/* 创建一个 socket 用于 tcp 通信 */
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("Socket");
exit(errno);
}
printf("socket created
");
/* 初始化服务器端（对方）的地址和端口信息 */
bzero(&dest, sizeof(dest));
dest.sin_family = AF_INET;
dest.sin_port = htons(atoi(argv[2]));
if (inet_aton(argv[1], (struct in_addr *) &dest.sin_addr.s_addr) == 0) {
perror(argv[1]);
exit(errno);
}
printf("address created
");
/* 连接服务器 */
if (connect(sockfd, (struct sockaddr *) &dest, sizeof(dest)) != 0) {
perror("Connect ");
exit(errno);
}
printf("server connected
");
/* 基于 ctx 产生一个新的 SSL */
ssl = SSL_new(ctx);
SSL_set_fd(ssl, sockfd);
/* 建立 SSL 连接 */
if (SSL_connect(ssl) == -1)
ERR_print_errors_fp(stderr);
else {
printf("Connected with %s encryption
", SSL_get_cipher(ssl));
ShowCerts(ssl);
}
/* 接收对方发过来的消息，最多接收 MAXBUF 个字节 */
bzero(buffer, MAXBUF + 1);
/* 接收服务器来的消息 */
len = SSL_read(ssl, buffer, MAXBUF);
if (len > 0)
printf("接收消息成功:'%s'，共%d个字节的数据
",
buffer, len);
else {
printf
("消息接收失败！错误代码是%d，错误信息是'%s'
",
errno, strerror(errno));
goto finish;
}
bzero(buffer, MAXBUF + 1);
strcpy(buffer, "from client->server");
/* 发消息给服务器 */
len = SSL_write(ssl, buffer, strlen(buffer));
if (len < 0)
printf
("消息'%s'发送失败！错误代码是%d，错误信息是'%s'
",
buffer, errno, strerror(errno));
else
printf("消息'%s'发送成功，共发送了%d个字节！
",
buffer, len);
finish:
/* 关闭连接 */
SSL_shutdown(ssl);
SSL_free(ssl);
close(sockfd);
SSL_CTX_free(ctx);
return 0;
}
`
运行
./server 7838 1 CAcert.pem privkey.pem
./telent 127.0.0.1 7838
截图
