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portscan

一个基于Python+Go的端口扫描及服务探测脚本

0x00 前言

近期由于公司环境整改/迭代以及历史弱口令等撞库,运维同事将内网测试环境的一些SSH等敏感端口对外,导致被挖矿团伙利用进行挖矿,虽然生产环境存在物理隔离,但仍存在极大安全风险,对此需要对所有用户进行端口对外开放监控。

0x01 确定方案

通过网上调研,发现滴滴安全应急响应中心发过一个相关的文章

需求基本一致,使用了下文章中提到的代码进行测试,可能我环境/带宽/目标等多种因素,导致测试之后发现并不理想,扫描速度慢且有时不稳定。

经过github、sourceforge、stackoverflow等一番搜索及疯狂复制粘贴,完成了个勉强算的上的成品。

代码逻辑如下:

1.1 用户输入目标处理

# 单独IP/HOST ip: 127.0.0.1 ip_list: 127.0.0.1 # CIDR ip: 127.0.0 ip_list: 127.0.0.1, 127.0.0.2, 127.0.0.3 ... 127.0.0.254 # IP访问 ip: 127.0.0.1-127.0.0.20 ip_list: 127.0.0.1, 127.0.0.2, 127.0.0.3 ... 127.0.0.20 # 文件 ip: ip.txt ip_list: Same as above

1.2 目标存活探测

使用ICMP协议进行ping检测,使用的第三方库pyping(该库不支持python3,若要用py3需要自己转换下)

1.3 Go脚本探测

编译port_scan.go

go build -buildmode=c-shared -o portscan.so portscan.go

探测结果返回:

# 单个端口 94.191.42.58:22 # 多个端口 94.191.42.58:22, 9099 

1.4 nmap指纹识别

根据go探测结果进行解析,分别使用nmap库进行服务识别

pip install python-nmap

返回结果:

127.0.0.1:22/ssh 127.0.0.1:9999:unknown ...

1.5 web service

若nmap结果返回为httpunknownsun-answerbook等时,尝试连接获取title

0x02 代码实现

2.1 用户输入处理

def get_ip_list(ip): '''  ip: 127.0.0.1  ip_list: 127.0.0.1   ip: 127.0.0  ip_list: 127.0.0.1, 127.0.0.2, 127.0.0.3 ... 127.0.0.254   ip: 127.0.0.1-127.0.0.20  ip_list: 127.0.0.1, 127.0.0.2, 127.0.0.3 ... 127.0.0.20   ip: ip.txt  ip_list: Same as above  ''' ip_list = [] iptonum = lambda x:sum([256**j*int(i) for j,i in enumerate(x.split('.')[::-1])]) numtoip = lambda x: '.'.join([str(x/(256**i)%256) for i in range(3,-1,-1)]) pattern = re.compile( r'^(([a-zA-Z]{1})|([a-zA-Z]{1}[a-zA-Z]{1})|' r'([a-zA-Z]{1}[0-9]{1})|([0-9]{1}[a-zA-Z]{1})|' r'([a-zA-Z0-9][-_.a-zA-Z0-9]{0,61}[a-zA-Z0-9]))\.' r'([a-zA-Z]{2,13}|[a-zA-Z0-9-]{2,30}.[a-zA-Z]{2,3})$' ) if '-' in ip: ip_range = ip.split('-') ip_start = long(iptonum(ip_range[0])) ip_end = long(iptonum(ip_range[1])) ip_count = ip_end - ip_start # print(ip_range,ip_start, ip_end, ip_count) if ip_count >= 0 and ip_count <= 65536: for ip_num in range(ip_start,ip_end+1): ip_list.append(numtoip(ip_num)) else: print('wrong format') elif '.txt' in ip: ip_file = open(ip, 'r') for ip in ip_file: ip_list.extend(get_ip_list(ip.strip())) ip_file.close() elif pattern.match(ip): ip_list.append(ip) else: ip_split=ip.split('.') net = len(ip_split) if net == 2: for b in range(1,255): for c in range(1,255): ip = "%s.%s.%d.%d"%(ip_split[0],ip_split[1],b,c) ip_list.append(ip) elif net == 3: for c in range(1,255): ip = "%s.%s.%s.%d"%(ip_split[0],ip_split[1],ip_split[2],c) ip_list.append(ip) elif net ==4: ip_list.append(ip) else: print('wrong format') return ip_list

2.2 目标存活探测

def get_target_status(target): try: r = pyping.ping(target) if r.ret_code == 0: return True else: return False except: return False

2.3 Go脚本探测

lib = cdll.LoadLibrary(u'./portscan.so') lib.Scan.argtypes = [c_char_p] lib.Scan.restype = c_char_p def run(ip): if get_target_status(ip): print("\033[32m[ * ] {} is alive\033[0m".format(ip)) ip = str(ip).encode("utf-8") temp_result = str(lib.Scan(ip)) print('\033[33mScan Result:{}\033[0m'.format(temp_result)) if ',' in temp_result: port_list = temp_result.split(':')[1].split(',') # print(port_list) port_num = len(port_list) if port_num > 30: print('Possible WAF/CND on target.') else: for i in range(len(port_list)): port = str(port_list[i]).strip() # print(port, int(port)) nmap_scan(ip=ip, port=int(port), arg="-sS -Pn --version-all --open -p") else: port_list = temp_result.split(':')[1] # print(port_list) nmap_scan(ip=ip,port=port_list,arg="-sS -Pn --version-all -p") else: print("\033[31m[ * ] {} is not alive\033[0m".format(ip))

1.4 nmap指纹识别

nm =nmap.PortScanner() def nmap_scan(ip,port,arg): try: ret = nm.scan(ip, arguments=arg+str(port)) # print(ret) service_name = ret['scan'][ip]['tcp'][int(port)]['name'] if 'http' in service_name or service_name == 'sun-answerbook' or 'unknown' in service_name: if service_name == 'https' or service_name == 'https-alt': scan_url = 'https://{}:{}'.format(ip,port) title = get_title(scan_url) service_name = '{}(title:{})'.format(service_name,title) else: scan_url = 'http://{}:{}'.format(ip,port) title = get_title(scan_url) service_name = '{}(title:{})'.format(service_name,title) print('\033[32m[ * ] {}:{}/{}\033[0m'.format(ip, port, service_name)) except nmap.nmap.PortScannerError: print("Please run -O method for root privileges")

1.5 web service

def get_title(scan_url): try: r = requests.get(scan_url,timeout=5, verify=False) r_detectencode = chardet.detect(r.content) # print(r_detectencode) actual_encode = r_detectencode['encoding'] response = re.findall(u'<title>(.*?)</title>', r.content, re.S) # print(response) if response == []: return None else: title = response[0].decode(actual_encode).decode('utf-8') # banner = r.headers['server'] return title except Exception as e: pass

0x03 运行效果

以tx云的一台vps为例,全端口扫描+服务识别我测试的稳定在40s之内,还可以。但是有些IP不知什么情况会比较慢,还需进行优化。

go代码就不放了,太烂了,完全cv拼凑的,若有兴趣可私聊讨论。

参考文章

https://medium.com/@KentGruber/building-a-high-performance-port-scanner-with-golang-9976181ec39d

https://github.com/golang/go/blob/master/src/cmd/cgo/doc.go

https://www.coder.work/article/202337

https://www.kancloud.cn/kancloud/web-application-with-golang/

https://www.yuyang.io/post/python-go-dynamic/

https://ejin66.github.io/2018/09/15/go-to-so-android.html

https://github.com/tkuebler/pyping

https://ixyzero.com/blog/archives/4171.html

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一个基于Python+Go的端口扫描及服务探测脚本

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