最近由于做题需要,得在Windows下使用OpenSSL,以前一直是通过MSYS/MinGW来编译的,编译完成后可以得到libcrypto.alibssl.a两个静态库(也会生成dll但是我一般喜欢用静态的),用gcc编译代码的时候加上-lssl -lcrypto就能用。然而这些库只能用在MinGW里,没法用在Visual Studio里,而MinGW对Win32 API的支持是实在不敢称赞。所以今天研究了一下用VC编译的方法。

工具

  • Visual Studio 2017
  • OpenSSL 1.1.1a
  • ActivePerl 5.26.1

步骤

0x0.看了一下OpenSSL的说明,在Windows平台上的编译是通过nmake调用cl和link来自动编译的。在VS2017里选上C++的工作负载之后,就会安装上cl、link、nmake这些工具。可以参考微软的说明:How to get the command-line tools

0x1.通常这些工具的路径并不在$PATH里,而微软也提供了构建环境的脚本,只要在命令提示符里运行这些脚本就能配置好环境。脚本位于VS2017安装目录下的VC\Auxiliary\Build里。启动命令提示符后,运行vcvarsall.bat [目标架构],设置环境(亲测PowerShell没用,得进到cmd,这里选择了x64架构)。

0x2.进入OpenSSL的目录,用perl运行Configure脚本:perl .\Configure VC-WIN64A no-asm。(目标平台VC-WIN64A,由于我没装NASM所以用no-asm选项不使用汇编源码)

0x3.运行nmake编译,nmake test测试,之后等着就行了。(活这么久还是第一次见直接命令行用cl编译程序…)

0x4.编译完成后如果运行nmake install_sw,就会把产生的lib、dll、exe复制到安装目录(默认是%ProgramW6432%\OpenSSL),注意不要运行nmake install,否则会安装上一堆html的文档页面。

0x5.使用的时候,要设置项目的属性,在包含目录和库目录里分别加上OpenSSL安装路径下的include和lib文件夹。并在源代码中添加上对应的预处理指令

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#pragma comment(lib, "libcrypto.lib")
#pragma comment(lib, "libssl.lib")

0x6.上面那样链接的是动态的dll库,运行的时候需要bin文件夹下的libcrypto-1_1-x64.dlllibssl-1_1-x64.dll,没有这两个dll程序就运行不了了。不知道为什么,OpenSSL编译产生了静态库libcrypto_static.liblibssl_static.lib,但是没有安装到lib下,手工把这两个文件复制过来,就可以通过下面的方法链接静态库了

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#pragma comment(lib, "libcrypto_static.lib")
#pragma comment(lib, "libssl_static.lib")

0x7.最后吐槽一句:M$的软件真tnd难用 (除了VSCode)

ZJUWLAN autoconnect(Windows)

OpenSSL装好之后顺便重续了一下之前写的ZJUWLAN自动认证程序,Windows平台和Unix的差别主要在头文件上,以及使用socket之前要先启动一下,其他代码基本相同:

zjuwlan-windows.cview raw
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/*
* Copyright (c) 2018, Nagi
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <stdio.h>
#include <string.h>
#include <WinSock2.h>
#include <Ws2tcpip.h>
#include <openssl/ssl.h>

#define DEBUG

#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "libcrypto_static.lib")
#pragma comment(lib, "libssl_static.lib")

const char net_zju_host[] = "net.zju.edu.cn";
const char net_zju_auth_path[] = "/include/auth_action.php";
const char net_zju_ok[] = "login_ok,";

const char *user_agent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36";

#define T_SUCCESS 0
#define T_INFO 1
#define T_ERROR 2

void output(int type, const char *fmt, ...)
{
va_list args;

switch (type)
{
case T_SUCCESS:
printf("[+] ");
break;
case T_ERROR:
printf("[-] ");
break;
default:
printf("[i] ");
break;
}
va_start(args, fmt);
vprintf(fmt, args);
va_end(args);
putchar('\n');
if (type == T_ERROR)
{
exit(1);
}
}

void init_ssl()
{
SSL_load_error_strings();
SSL_library_init();
}

SSL_CTX *create_ctx()
{
SSL_CTX *ctx;
int result;

ctx = SSL_CTX_new(TLS_method());
if (ctx == NULL)
{
output(T_ERROR, "SSL_CTX_new() failed");
}
result = SSL_CTX_set_min_proto_version(ctx, TLS1_VERSION);
if (result == 0)
{
SSL_CTX_free(ctx);
output(T_ERROR, "SSL_CTX_set_min_proto_version() failed");
}
return ctx;
}

SSL *connect_ssl(SSL_CTX *ctx, int fd)
{
SSL *ssl;
int result;

ssl = SSL_new(ctx);
if (ssl == NULL)
{
output(T_ERROR, "SSL_new() failed");
}
result = SSL_set_fd(ssl, fd);
if (result != 1)
{
output(T_ERROR, "SSL_set_fd() failed");
}
result = SSL_connect(ssl);
if (result != 1)
{
output(T_ERROR, "SSL handshake failed");
}
return ssl;
}

static const char urlencode_chars[] = {
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1,
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1};

int urlencode(const char *in, char *out)
{
int i, printed;
unsigned char n1, n2;

printed = 0;
for (i = 0; in[i] != '\0'; i++)
{
if (urlencode_chars[(unsigned)in[i]] != 0)
{
n1 = ((unsigned char)in[i]) >> 4;
n2 = ((unsigned char)in[i]) & 0xF;
out[printed++] = '%';
out[printed++] = n1 > 9 ? '7' + n1 : '0' + n1;
out[printed++] = n2 > 9 ? '7' + n2 : '0' + n2;
}
else
{
out[printed++] = in[i];
}
}
out[printed] = '\0';
return printed;
}

int generate_post(char *buf, char *username, char *password)
{
int printed, content_len;
char data_buf[256];

printed = 0;
printed += sprintf(buf + printed, "POST %s HTTP/1.1\r\nHost: %s\r\nConnection: close\r\nOrigin: https://%s\r\n", net_zju_auth_path, net_zju_host, net_zju_host);
printed += sprintf(buf + printed, "X-Requested-With: XMLHttpRequest\r\nContent-Type: application/x-www-form-urlencoded\r\nReferer: https://%s/srun_portal_pc.php?&ac_id=3\r\n", net_zju_host);
printed += sprintf(buf + printed, "Accept-Encoding: gzip, deflate, br\r\nAccept-Language: zh-CN,zh;q=0.9\r\nUser-Agent: %s\r\n", user_agent);
memset(data_buf, 0, sizeof(data_buf));
content_len = 0;
content_len += sprintf(data_buf + content_len, "action=login&username=");
content_len += urlencode(username, data_buf + content_len);
content_len += sprintf(data_buf + content_len, "&password=");
content_len += urlencode(password, data_buf + content_len);
content_len += sprintf(data_buf + content_len, "&ac_id=3&user_ip=&nas_ip=&user_mac=&save_me=0&ajax=1");
printed += sprintf(buf + printed, "Content-Length: %d\r\n\r\n%s", content_len, data_buf);
return printed;
}

void send_post(SSL *ssl, char *buf, size_t size)
{
size_t send, this_send;
int result;

send = 0;
output(T_INFO, "Sending the POST request to server");
#ifdef DEBUG
puts(buf);
#endif
while (send < size)
{
result = SSL_write_ex(ssl, buf + send, size - send, &this_send);
if (result != 1)
{
output(T_ERROR, "SSL_write_ex() failed");
}
send += this_send;
output(T_INFO, "Sent %ld/%ld bytes", send, size);
}
return;
}

void recv_result(SSL *ssl, char *buf, size_t size)
{
size_t recv, this_recv;
int result;

recv = 0;
output(T_INFO, "Receiving the reply");
while (1)
{
result = SSL_read_ex(ssl, buf + recv, size - recv, &this_recv);
if (result != 1)
{
break;
}
recv += this_recv;
output(T_INFO, "%ld bytes receivied", recv);
}
buf[recv] = '\0';
#ifdef DEBUG
puts(buf);
#endif
return;
}

void final_ssl(SSL *ssl, SSL_CTX *ctx)
{
SSL_shutdown(ssl);
SSL_free(ssl);
SSL_CTX_free(ctx);
return;
}

int main(int argc, char *argv[], char *envp[])
{
WORD myVersionRequest;
WSADATA wsaData;
SOCKET auth_sock;
int result, post_size, err;
struct sockaddr_in net_zju_addr;
char post_buf[1024], recv_buf[1024], net_zju_ip[16];
char *username, *password, *pos;
struct hostent *resolve_result;
SSL_CTX *ctx;
SSL *ssl;

if (argc > 3)
{
output(T_INFO, "Usage: %s <username> <password>", argv[0]);
exit(1);
}
username = "just-a-test-username";
password = "just-a-test-password-0123456789abcdef";
if (argc > 2)
{
password = argv[2];
}
if (argc > 1)
{
username = argv[1];
}
myVersionRequest = MAKEWORD(1, 1);
err = WSAStartup(myVersionRequest, &wsaData);
if (err)
{
output(T_ERROR, "WSAStartup() failed.");
}
memset(post_buf, 0, sizeof(post_buf));
init_ssl();
ctx = create_ctx();
resolve_result = gethostbyname(net_zju_host);
if (resolve_result == NULL)
{
output(T_ERROR, "gethostbyname() failed");
}
if (resolve_result->h_addrtype != AF_INET)
{
output(T_ERROR, "Can't get IPv4 address");
}
net_zju_addr.sin_family = AF_INET;
net_zju_addr.sin_port = htons(443);
memcpy(&(net_zju_addr.sin_addr), resolve_result->h_addr_list[0], 4);
inet_ntop(AF_INET, &(net_zju_addr.sin_addr), net_zju_ip, sizeof(net_zju_ip));
output(T_INFO, "Using the IP address %s", net_zju_ip);
auth_sock = socket(AF_INET, SOCK_STREAM, 0);
if (auth_sock < 0)
{
output(T_ERROR, "socket() failed");
}
result = connect(auth_sock, (struct sockaddr *)&net_zju_addr, sizeof(struct sockaddr));
if (result != 0)
{
output(T_ERROR, "connect() failed");
}
output(T_INFO, "Connected to net.zju.edu.cn");
ssl = connect_ssl(ctx, auth_sock);
post_size = generate_post(post_buf, username, password);
send_post(ssl, post_buf, (size_t)post_size);
recv_result(ssl, recv_buf, sizeof(recv_buf));
pos = strstr(recv_buf, net_zju_ok);
if (pos != NULL)
{
output(T_SUCCESS, "Auth succeed");
}
else
{
pos = strstr(recv_buf, "\r\n\r\n");
if (pos != NULL)
{
output(T_ERROR, "Auth failed, %s", pos + 4);
}
else
{
output(T_ERROR, "Auth failed");
}
}
final_ssl(ssl, ctx);
return 0;
}

估计也没几个人电脑上有OpenSSL…所以我上传了一个编译完的程序,通过命令行传递用户名和密码运行。也可以在手工修改这个程序.rdata里面username和password的默认值之后,直接双击运行。