域名扫描工具subDomainBrute源码分析
<h1 id="subdomainsbrute简介">SubDomainsBrute简介</h1><p> SubDomainsBrute是一款目标域名收集工具 ，用小字典递归地发现三级域名、四级域名、五级域名等不容易被探测到的域名。字典较为全面，小字典就包括3万多条，大字典多达8万条。默认使用114DNS、百度DNS、阿里DNS这几个快速又可靠的公共DNS进行查询，可随时修改配置文件添加你认为可靠的DNS服务器。自动筛选泛解析的域名，当前规则是： 超过10个域名指向同一IP，则此后发现的其他指向该IP的域名将被丢弃。整体速度还可以，每秒稳定扫描100到200个域名（10个线程）。<br>
工具可从github上 获取。</p>
<p><strong>Github地址：</strong>https://github.com/lijiejie/subDomainsBrute</p>
<h1 id="目录">目录</h1>
<blockquote>
<p>dict #存放dns目录和域名字典</p>
<p>lib</p>
<p>--__init__.py</p>
<p>--cmdline.py #参数设置</p>
<p>--common_py2.py #获取域名字典</p>
<p>--common_py3.py #检查dns是否可用</p>
<p>--common.py #获取字典</p>
<p>--consle_width.py</p>
<p>--scanner_py2.py #为3.5版本以下的域名扫描文件</p>
<p>--scanner_py3.py #为3.5版本以上的域名扫描文件</p>
<p>subDomainsBrute.py 函数入口处</p>
</blockquote>
<h1 id="执行流程">执行流程</h1>
<h2 id="一检查参数和字典">一.检查参数和字典</h2>
<p>获取命令行输入的参数</p>
<pre><code class="language-python">#subDomainsBrute.py
options, args = parse_args()
</code></pre>
<p>根据域名创建子文件，存放子域名信息</p>
<pre><code class="language-python">#subDomainsBrute.py
tmp_dir = 'tmp/%s_%s' % (args, int(time.time()))
if not os.path.exists(tmp_dir):
os.makedirs(tmp_dir)
</code></pre>
<p>调用common_py3.py中的load_next_sub()函数，传入命令行输入的参数作为函数参数，得到公共dns列表</p>
<pre><code class="language-python">#subDomainsBrute.py
dns_servers = load_dns_servers()
</code></pre>
<p>进入load_dns_servers()查看，其中dns_servers.txt存放公共dns：如119.29.29.29是腾讯DNSPod公共DNS，还有114dns（114.114.114.114），阿里（223.5.5.5.5），百度（180.76.76.76），360（101.226.4.6），google（8.8.8.8）等 ，使用一个已经存在的域名验证dns是否有效，</p>
<pre><code class="language-python">#common_py3.py
def load_dns_servers():
print_msg('[+] Validate DNS servers', line_feed=True)
dns_servers = []
servers_to_test = [] #存储可用的dns地址
for server in open('dict/dns_servers.txt').readlines(): #遍历dns的Ip地址
server = server.strip() #移除字符串头尾指定的字符（默认为空格或换行符）
if server and not server.startswith('#'): #检查字符串是否是以#开头，将不以#开头的加入
servers_to_test.append(server) #将不以#开头的添加到列表
loop = asyncio.get_event_loop()
loop.run_until_complete(async_load_dns_servers(servers_to_test, dns_servers)) #调用async_load_dns_servers函数
# loop.close()
server_count = len(dns_servers)
print_msg('\n[+] %s DNS Servers found' % server_count, line_feed=True)
if server_count == 0:
print_msg(' No valid DNS Server !', line_feed=True)
sys.exit(-1)
return dns_servers #返回公共dns列表
#进入async_load_dns_servers
async def async_load_dns_servers(servers_to_test, dns_servers): #async为异步标志
tasks = []
for server in servers_to_test:
task = test_server_python3(server, dns_servers) #调用test_server_python3函数
tasks.append(task)
await asyncio.gather(*tasks) #异步执行
#进入test_server_python3()
async def test_server_python3(server, dns_servers):
resolver = aiodns.DNSResolver()
try:
resolver.nameservers =
answers = await resolver.query('public-dns-a.baidu.com', 'A') #一个已经存在的域名
if answers.host != '180.76.76.76': #判断解析是否正确
raise Exception('Incorrect DNS response')
try:
await resolver.query('test.bad.dns.lijiejie.com', 'A') #尝试一个不存在的域名
with open('bad_dns_servers.txt', 'a') as f:
f.write(server + '\n') #解析失败，dns无效写入bad_dns_servers.txt文件
print_msg('[+] Bad DNS Server found %s' % server)
except Exception as e:
dns_servers.append(server) #解析正确判断为有效dns，加入列表
print_msg('[+] Server %s < OK > Found %s' % (server.ljust(16), len(dns_servers)))
except Exception as e:
print_msg('[+] Server %s <Fail> Found %s' % (server.ljust(16), len(dns_servers)))
</code></pre>
<p>回到入口程序，然后调用了common_py3.py中的load_next_sub()函数，得到子域名字典，进入load_next_sub()查看</p>
<pre><code class="language-python">#subDomainsBrute.py
next_subs = load_next_sub(options)
#common_py3.py
def load_next_sub(options):
next_subs = []
_file = 'dict/next_sub_full.txt' if options.full_scan else 'dict/next_sub.txt' #根据参数判断使用哪个字典
with open(_file) as f:
for line in f:
sub = line.strip() #移除每行头尾空格和换行
if sub and sub not in next_subs: #判断是否在next_subs中重复
tmp_set = {sub}
while tmp_set:
item = tmp_set.pop()
if item.find('{alphnum}') >= 0:
for _letter in 'abcdefghijklmnopqrstuvwxyz0123456789':
tmp_set.add(item.replace('{alphnum}', _letter, 1))
elif item.find('{alpha}') >= 0:
for _letter in 'abcdefghijklmnopqrstuvwxyz':
tmp_set.add(item.replace('{alpha}', _letter, 1))
elif item.find('{num}') >= 0:
for _letter in '0123456789':
tmp_set.add(item.replace('{num}', _letter, 1))
elif item not in next_subs:
next_subs.append(item)#多次判断是否存在{alphnum}、{alpha}、{num}进行替换，替换后加入到子域名列表中
return next_subs #返回子域名列表
</code></pre>
<p>使用multiprocessing多进程共享数据。i代表类型为int整数，0代表初始值</p>
<pre><code class="language-python">#subDomainsBrute.py
scan_count = multiprocessing.Value('i', 0)
found_count = multiprocessing.Value('i', 0)
queue_size_array = multiprocessing.Array('i', options.process)
</code></pre>
<blockquote>
<p>multiprocessing.Value(typecode_or_type, *args, lock=True) #共享单个数据，其值<strong>通过value属性访问</strong>。</p>
<pre><code class="language-text">typecode_or_type：数组中的数据类型，为代表数据类型的类或者str。比如，'i'表示int，'f'表示float。
args：可以设置初始值。比如：multiprocessing.Value('d',6)生成值为6.0的数据。
lock：bool，是否加锁。
</code></pre>
</blockquote>
<p>判断w参数不存在时，主程序调用wildcard_test()函数，进入wildcard_test()查看， 和test_server相似 ，通配符测试失败后建议使用参数-w强制扫描</p>
<pre><code class="language-python">#subDomainsBrute.py
if not options.w:
domain = wildcard_test(args, dns_servers)
else:
domain = args
#common_py2.py
def wildcard_test(domain, dns_servers, level=1):
try:
r = dns.resolver.Resolver(configure=False)
r.nameservers = dns_servers
answers = r.query('lijiejie-not-existed-test.%s' % domain)
ips = ', '.join(sorted())
if level == 1:
print('any-sub.%s\t%s' % (domain.ljust(30), ips))
wildcard_test('any-sub.%s' % domain, dns_servers, 2)
elif level == 2:
print('\nUse -w to enable force scan wildcard domain')
sys.exit(0)
except Exception as e:
return domain
</code></pre>
<p>然后调用get_sub_file_path()，将字典相对路径返回并赋值</p>
<pre><code class="language-python">#subDomainsBrute.py
options.file = get_sub_file_path(options)
#common_py2.py
def get_sub_file_path(options):
if options.full_scan and options.file == 'subnames.txt':
sub_file_path = 'dict/subnames_full.txt' #判断使用参数--full和subnames.txt才使用subnames.txt字典
else:
if os.path.exists(options.file):
sub_file_path = options.file
elif os.path.exists('dict/%s' % options.file):
sub_file_path = 'dict/%s' % options.file
else:
print_msg(' Names file not found: %s' % options.file)
exit(-1)
return sub_file_path #返回字典的具体路径
</code></pre>
<h2 id="二域名获取">二.域名获取</h2>
<p>根据输入的进程数设置进程数，添加到进程池中，并设置了run_process()函数</p>
<pre><code class="language-python">#subDomainsBrute.py
all_process = []
for process_num in range(options.process):
p = multiprocessing.Process(target=run_process,
args=(domain, options, process_num, dns_servers, next_subs,scan_count, found_count, queue_size_array, tmp_dir))
all_process.append(p)
p.start()
</code></pre>
<p>到run_process()中查看</p>
<pre><code class="language-python">#subDomainsBrute.py
def run_process(*params):
signal.signal(signal.SIGINT, user_abort)
s = SubNameBrute(*params) #定义该类
s.run()
#scanner_py2.py
class SubNameBrute(object):
def __init__(self, *params): #SubNameBrute类中首先执行函数
self.domain, self.options, self.process_num, self.dns_servers, self.next_subs, self.scan_count, self.found_count, self.queue_size_array, tmp_dir = params #传入参数
/*
... #默认参数赋值
*/
self.outfile = open('%s/%s_part_%s.txt' % (tmp_dir, self.domain, self.process_num), 'w') #定义输出文件
self.normal_names_set = set()
self.load_sub_names() #调用自身的load_sub_names函数
self.lock = RLock()
self.threads_status = ['1'] * self.options.threads
def load_sub_names(self): #返回测试域名列表作为字典
normal_lines = []
wildcard_lines = []
wildcard_set = set()
regex_list = []
lines = set()
with open(self.options.file) as inFile:
for line in inFile.readlines():
sub = line.strip()
if not sub or sub in lines: #排除sub为空和sub重复的情况
continue
lines.add(sub)
brace_count = sub.count('{') #检测{通配符}数量进行替换
if brace_count > 0:
wildcard_lines.append((brace_count, sub))
sub = sub.replace('{alphnum}', '')
sub = sub.replace('{alpha}', '')
sub = sub.replace('{num}', '')
if sub not in wildcard_set:
wildcard_set.add(sub)
regex_list.append('^' + sub + '$')
else:
normal_lines.append(sub)
self.normal_names_set.add(sub)
if regex_list:
pattern = '|'.join(regex_list)
_regex = re.compile(pattern)
for line in normal_lines:
if _regex.search(line):
normal_lines.remove(line)
for _ in normal_lines:
self.queue.put((0, _)) # priority set to 0
for _ in wildcard_lines:
self.queue.put(_)
def run(self):
threads =
gevent.joinall(threads)
def scan(self, j):
self.resolvers.nameservers = ] + self.dns_servers
while True:
try:
if time.time() - self.count_time > 1.0:
self.lock.acquire()
self.scan_count.value += self.scan_count_local
self.scan_count_local = 0
self.queue_size_array = self.queue.qsize()
if self.found_count_local:
self.found_count.value += self.found_count_local
self.found_count_local = 0
self.count_time = time.time()
self.lock.release()
brace_count, sub = self.queue.get_nowait()
self.threads_status = '1'
if brace_count > 0:
brace_count -= 1
if sub.find('{next_sub}') >= 0:
for _ in self.next_subs:
self.queue.put((0, sub.replace('{next_sub}', _)))
if sub.find('{alphnum}') >= 0:
for _ in 'abcdefghijklmnopqrstuvwxyz0123456789':
self.queue.put((brace_count, sub.replace('{alphnum}', _, 1)))
elif sub.find('{alpha}') >= 0:
for _ in 'abcdefghijklmnopqrstuvwxyz':
self.queue.put((brace_count, sub.replace('{alpha}', _, 1)))
elif sub.find('{num}') >= 0:
for _ in '0123456789':
self.queue.put((brace_count, sub.replace('{num}', _, 1)))
continue
except gevent.queue.Empty as e:
self.threads_status = '0'
gevent.sleep(0.5)
if '1' not in self.threads_status:
break
else:
continue
try:
if sub in self.found_subs:
continue
self.scan_count_local += 1
cur_domain = sub + '.' + self.domain #子域名和域名拼接成当前域名
answers = self.resolvers.query(cur_domain) #请求dns进行解析当前域名
if answers: #返回解析存在执行if块
self.found_subs.add(sub) #添加到列表中
ips = ', '.join(sorted()) #使用,分隔解析的ip字符串
if ips in ['1.1.1.1', '127.0.0.1', '0.0.0.0', '0.0.0.1']: #排除非正常ip
continue
if self.options.i and is_intranet(answers.address): #调用is_intranet判断ip不是内网地址时加入数组
continue
try:
self.scan_count_local += 1
answers = self.resolvers.query(cur_domain, 'cname') #根据cname记录查找新的域名别名
cname = answers.target.to_unicode().rstrip('.') #分隔新域名别名
if cname.endswith(self.domain) and cname not in self.found_subs: #判断当与原域名不同且不在发现的域名列表中时添加到域名列表中
cname_sub = cname[:len(cname) - len(self.domain) - 1]
if cname_sub not in self.normal_names_set:
self.found_subs.add(cname)
self.queue.put((0, cname_sub))
except Exception as e:
pass
first_level_sub = sub.split('.')[-1]
max_found = 20
if self.options.w:
first_level_sub = ''
max_found = 3
if (first_level_sub, ips) not in self.ip_dict:
self.ip_dict[(first_level_sub, ips)] = 1
else:
self.ip_dict[(first_level_sub, ips)] += 1
if self.ip_dict[(first_level_sub, ips)] > max_found:
continue
self.found_count_local += 1
self.outfile.write(cur_domain.ljust(30) + '\t' + ips + '\n')
self.outfile.flush()
try:
self.scan_count_local += 1
self.resolvers.query('lijiejie-test-not-existed.' + cur_domain)
except (dns.resolver.NXDOMAIN, ) as e: # dns.resolver.NoAnswer
if self.queue.qsize() < 50000:
for _ in self.next_subs:
self.queue.put((0, _ + '.' + sub))
else:
self.queue.put((1, '{next_sub}.' + sub))
except Exception as e:
pass
except (dns.resolver.NXDOMAIN, dns.resolver.NoAnswer) as e:
pass
except dns.resolver.NoNameservers as e:
self.queue.put((0, sub)) # Retry
except dns.exception.Timeout as e:
self.timeout_subs = self.timeout_subs.get(sub, 0) + 1
if self.timeout_subs <= 1:
self.queue.put((0, sub)) # Retry
except Exception as e:
import traceback
traceback.print_exc()
with open('errors.log', 'a') as errFile:
errFile.write('[%s] %s\n' % (type(e), str(e)))
</code></pre>
<p>其中调用的is_intranet()函数如下，将10,172.16~31,192.168开头的判定为内网地址</p>
<pre><code class="language-python">#common.py
def is_intranet(ip):
ret = ip.split('.')
if len(ret) != 4:
return True
if ret == '10':
return True
if ret == '172' and 16 <= int(ret) <= 31:
return True
if ret == '192' and ret == '168':
return True
return False
</code></pre>
<h2 id="三数据输出">三.数据输出</h2>
<p>之后主程序根据进程活跃情况绘制进度条</p>
<pre><code class="language-python">#subDomainsBrute.py
char_set = ['\\', '|', '/', '-'] #进度条显示的字符
count = 0
while all_process:
for p in all_process:
if not p.is_alive():
all_process.remove(p)
groups_count = 0
for c in queue_size_array:
groups_count += c
msg = '[%s] %s found, %s scanned in %.1f seconds, %s groups left' % (
char_set, found_count.value, scan_count.value, time.time() - start_time, groups_count)
print_msg(msg)
count += 1
time.sleep(0.3)
</code></pre>
<p>之后调用get_out_file_name()函数获取输出文件名，将域名数据存放到文件中</p>
<pre><code class="language-python">#subDomainsBrute.py
out_file_name = get_out_file_name(domain, options)
all_domains = set()
domain_count = 0
with open(out_file_name, 'w') as f:
for _file in glob.glob(tmp_dir + '/*.txt'):
with open(_file, 'r') as tmp_f:
for domain in tmp_f:
if domain not in all_domains:
domain_count += 1
all_domains.add(domain) # cname query can result in duplicated domains
f.write(domain)
</code></pre>
<h2 id="函数调用关系图">函数调用关系图</h2>
<p><img src="https://img1.imgtp.com/2023/09/13/GzDO5g7V.png"></p>
<p><strong>参考：</strong></p>
<p>SubDomainsBrute源码分析 | 码农家园 (codenong.com)</p><br><br>
来源：https://www.cnblogs.com/shuoys8/p/17699293.html
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