最近ZJUWLAN总是莫名掉线,而且三本的垃圾网还要专门打开浏览器登陆,登陆完成之后还弹出来一个登陆成功的小窗口,用i3wm的话小窗口还直接被平铺…对于我这种伪完美主义者&强迫症来说简直无可忍受,于是突发奇想,能不能直接用脚本登陆上去,于是打开了chrome的开发者工具,仔细研究了一番。

登陆页面就是一个form,点击提交的时候,会调用js/srun_portal.js里面的check1(frm),代码如下,居然还贴心地给出了注释:

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function check1(frm) //弹窗认证
{
if (frm.username.value == "") {
alert("用户名不能为空,请输入用户名");
frm.username.focus();
return false;
}

if (frm.password.value == "") {
alert("密码不能为空,请输入密码");
frm.password.focus();
return false;
}

var res1 = "";

var e = Encrypt(frm.password.value);
var save_me = (frm.save_me.checked) ? 1 : 0;
var d = "action=login&username=" + $("input[name='username']").val() +
"&password=" + frm.password.value +
"&ac_id=" + $("input[name='ac_id']").val() +
"&user_ip=" + $("input[name='user_ip']").val() +
"&nas_ip=" + $("input[name='nas_ip']").val() +
"&user_mac=" + $("input[name='user_mac']").val() +
"&save_me=" + save_me +
"&ajax=1";
//这里要用AJAX同步提交POST
$.ajax({
type: "post",
url: "/include/auth_action.php",
action: 'login',
data: d,
async: false,
success: function (res) {
res1 = res;
}
});

var p = /^login_ok,/;
if (p.test(res1))//认证成功,弹出小窗口
{
var arr = res1.split(",");
if (arr[1] != "")//写入用于双栈认证的COOKIE
{
setCookie("double_stack_login", arr[1]);
}
if (arr[2] != "")//写入用户名密码COOKIE
{
setCookie("login", arr[2]);
}
window.open("user_logout.html", "", "width=400,height=300,left=0,top=0,resizable=1");//弹出小窗口
setTimeout("redirect()", 2000); //重定向到输入的网址
//alert('登录成功');
//window.location.href="http://202.117.1.166:8080/xjtu/index.do?method=mXJTU";
}
else {
alert(res1); //提示错误信息
}

return false;
}

js基本没有什么内容,只需要把表单的内容POST到/include/auth_action.php这个路径就行了,如果返回的信息是login_ok,开头的话,就说明登陆成功了,直接python解决之:

zjuwlan.pyview raw
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#!/usr/bin/env python3
import requests
from bs4 import BeautifulSoup
import sys


ZJU_WLAN = 'https://net.zju.edu.cn'
ZJU_INDEX = '/'
ZJU_AUTH = '/include/auth_action.php'

HTTP = {
'Host': 'net.zju.edu.cn',
'Connection': 'keep-alive',
'Accept-Encoding': 'gzip, deflate, br',
'Accept-Language': 'zh-CN,zh;q=0.9',
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/17.17134'
}

XHR = {
'Host': 'net.zju.edu.cn',
'Connection': 'keep-alive',
'Origin': 'https://net.zju.edu.cn',
'X-Requested-With': 'XMLHttpRequest',
'Content-Type': 'application/x-www-form-urlencoded',
'Referer': 'https://net.zju.edu.cn/srun_portal_pc.php?&ac_id=3',
'Accept-Encoding': 'gzip, deflate, br',
'Accept-Language': 'zh-CN,zh;q=0.9',
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/17.17134'
}


def main():
if len(sys.argv) != 3:
print('usage: %s <username> <password>')
exit()
username = sys.argv[1]
password = sys.argv[2]
zju_session = requests.session()
index = zju_session.get(ZJU_WLAN+ZJU_INDEX, headers=HTTP)
soup = BeautifulSoup(index.content, "html.parser")
ac_id = soup.find('input', {'name': 'ac_id'})['value']
user_ip = soup.find('input', {'name': 'user_ip'})['value']
nas_ip = soup.find('input', {'name': 'nas_ip'})['value']
user_mac = soup.find('input', {'name': 'user_mac'})['value']
data = {
'action': 'login',
'username': username,
'password': password,
'ac_id': ac_id,
'user_ip': user_ip,
'nas_ip': nas_ip,
'user_mac': user_mac,
'save_me': 0,
'ajax': 1
}
auth = zju_session.post(ZJU_WLAN+ZJU_AUTH, data=data, headers=XHR)
result = auth.content.decode('utf8')
if result[:9] == 'login_ok,':
print('[+] Login succeed!')
else:
print('[-] Failed '+result)


if __name__ == '__main__':
main()

后来试了试,发现最初访问https://net.zju.edu.cn/srun_portal_pc.php?&ac_id=3这一步并没有什么用处,连个cookie都没给设,真不愧是三本的垃圾网…不过好歹还给跳转到了https,说明网络中心基本的安全意识还是有的hhh。

所以实际上只需要直接把js里生成的那串数据POST过去就行了,正好最近在学习网络编程,于是改用C实现了一个登陆程序,输入用户名和密码作为参数就能登陆。写的比较烂,如有不妥之处还请多多指教(output函数参考了nginx中对于ngx_log_stderr函数的可变长度参数的实现,装个逼加个许可证hhh):

zjuwlan.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 <netdb.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <openssl/ssl.h>

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) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/17.17134";

#define SUCCESS 0
#define INFO 1
#define ERROR 2

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

switch (type)
{
case SUCCESS:
printf("\e[32m[+] ");
break;
case ERROR:
printf("\e[31m[-] ");
break;
default:
printf("\e[33m[!] ");
break;
}
va_start(args, fmt);
vprintf(fmt, args);
va_end(args);
puts("\e[0m");
if (type == 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(ERROR, "SSL_CTX_new() failed");
}
result = SSL_CTX_set_min_proto_version(ctx, TLS1_VERSION);
if (result == 0)
{
SSL_CTX_free(ctx);
output(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(ERROR, "SSL_new() failed");
}
result = SSL_set_fd(ssl, fd);
if (result != 1)
{
output(ERROR, "SSL_set_fd() failed");
}
result = SSL_connect(ssl);
if (result != 1)
{
output(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(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(ERROR, "SSL_write_ex() failed");
}
send += this_send;
output(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(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(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[])
{
int auth_sock, result, post_size;
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(INFO, "Usage: %s <username> <password>", argv[0]);
exit(1);
}
username = argv[1];
password = argv[2];
memset(post_buf, 0, sizeof(post_buf));
init_ssl();
ctx = create_ctx();
resolve_result = gethostbyname(net_zju_host);
if (resolve_result == NULL)
{
output(ERROR, "gethostbyname() failed");
}
if (resolve_result->h_addrtype != AF_INET)
{
output(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(INFO, "Using the IP address %s", net_zju_ip);
auth_sock = socket(AF_INET, SOCK_STREAM, 0);
if (auth_sock < 0)
{
output(ERROR, "socket() failed");
}
result = connect(auth_sock, (struct sockaddr *)&net_zju_addr, sizeof(struct sockaddr));
if (result != 0)
{
output(ERROR, "connect() failed");
}
output(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(SUCCESS, "Auth succeed");
}
else
{
pos = strstr(recv_buf, "\r\n\r\n");
if (pos != NULL)
{
output(ERROR, "Auth failed, %s", pos + 4);
}
else
{
output(ERROR, "Auth failed");
}
}
final_ssl(ssl, ctx);
return 0;
}
1
$ gcc -O2 -Wall zjuwlan.c -o zjuwlan -lcrypto -lssl