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<a class="post-title-link" href="/2016-09-pwnable-2-collision/" itemprop="url">
pwnable-2-collision
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<h2 id="题目"><a href="#题目" class="headerlink" title="题目"></a>题目</h2><p>Daddy told me about cool MD5 hash collision today.<br>I wanna do something like that too!</p>
<p>ssh [email protected] -p2222 (pw:guest)</p>
<h2 id="solve"><a href="#solve" class="headerlink" title="solve"></a>solve</h2><figure class="highlight sh"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line">col@ubuntu:~$ ls -la</div><div class="line">total 32</div><div class="line">drwxr-x--- 4 root col 4096 Aug 20 2014 .</div><div class="line">dr-xr-xr-x 66 root root 4096 Jul 13 06:44 ..</div><div class="line">d--------- 2 root root 4096 Jun 12 2014 .bash_history</div><div class="line">-r-sr-x--- 1 col2 col 7341 Jun 11 2014 col</div><div class="line">-rw-r--r-- 1 root root 555 Jun 12 2014 col.c</div><div class="line">-r--r----- 1 col2 col2 52 Jun 11 2014 flag</div><div class="line">dr-xr-xr-x 2 root root 4096 Aug 20 2014 .irssi</div></pre></td></tr></table></figure>
<p>col.c代码如下</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div></pre></td><td class="code"><pre><div class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><stdio.h></span></span></div><div class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><string.h></span></span></div><div class="line"><span class="keyword">unsigned</span> <span class="keyword">long</span> hashcode = <span class="number">0x21DD09EC</span>;</div><div class="line"><span class="function"><span class="keyword">unsigned</span> <span class="keyword">long</span> <span class="title">check_password</span><span class="params">(<span class="keyword">const</span> <span class="keyword">char</span>* p)</span></span>{</div><div class="line"> <span class="keyword">int</span>* ip = (<span class="keyword">int</span>*)p;</div><div class="line"> <span class="keyword">int</span> i;</div><div class="line"> <span class="keyword">int</span> res=<span class="number">0</span>;</div><div class="line"> <span class="keyword">for</span>(i=<span class="number">0</span>; i<<span class="number">5</span>; i++){</div><div class="line"> res += ip[i];</div><div class="line"> }</div><div class="line"> <span class="keyword">return</span> res;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">(<span class="keyword">int</span> argc, <span class="keyword">char</span>* argv[])</span></span>{</div><div class="line"> <span class="keyword">if</span>(argc<<span class="number">2</span>){</div><div class="line"> <span class="built_in">printf</span>(<span class="string">"usage : %s [passcode]\n"</span>, argv[<span class="number">0</span>]);</div><div class="line"> <span class="keyword">return</span> <span class="number">0</span>;</div><div class="line"> }</div><div class="line"> <span class="keyword">if</span>(<span class="built_in">strlen</span>(argv[<span class="number">1</span>]) != <span class="number">20</span>){</div><div class="line"> <span class="built_in">printf</span>(<span class="string">"passcode length should be 20 bytes\n"</span>);</div><div class="line"> <span class="keyword">return</span> <span class="number">0</span>;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="keyword">if</span>(hashcode == check_password( argv[<span class="number">1</span>] )){</div><div class="line"> system(<span class="string">"/bin/cat flag"</span>);</div><div class="line"> <span class="keyword">return</span> <span class="number">0</span>;</div><div class="line"> }</div><div class="line"> <span class="keyword">else</span></div><div class="line"> <span class="built_in">printf</span>(<span class="string">"wrong passcode.\n"</span>);</div><div class="line"> <span class="keyword">return</span> <span class="number">0</span>;</div><div class="line">}</div></pre></td></tr></table></figure>
<p>输入一个20个字符的字符串，程序会把它转化为5个int数相加，所以我们只要想办法凑足5个数的和是0x21DD09EC就可以了，要注意不能有空字符。</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">$ python -c <span class="string">"print '\xc8\xce\xc5\x06'*4+'\xcc\xce\xc5\06'"</span></div><div class="line">���������������</div></pre></td></tr></table></figure>
<p>竟然是乱码</p>
<p>幸好乱码程序也可以接受</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">$ ./col `python -c <span class="string">"print '\xc8\xce\xc5\x06'*4+'\xcc\xce\xc5\06'"</span>`</div><div class="line">daddy! I just managed to create a <span class="built_in">hash</span> collision :)</div></pre></td></tr></table></figure>
<p>flag:daddy! I just managed to create a hash collision :)</p>
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pwnable-1-fd
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<h2 id="题目"><a href="#题目" class="headerlink" title="题目"></a>题目</h2><blockquote>
<p>Mommy! what is a file descriptor in Linux?<br>ssh [email protected] -p2222 (pw:guest)</p>
</blockquote>
<h2 id="solve"><a href="#solve" class="headerlink" title="solve"></a>solve</h2><p>首先ssh登陆到服务器上<br><figure class="highlight sh"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div></pre></td><td class="code"><pre><div class="line">fd@ubuntu:~$ ls -al</div><div class="line">total 36</div><div class="line">drwxr-x--- 4 root fd 4096 Jul 1 02:36 .</div><div class="line">dr-xr-xr-x 66 root root 4096 Jul 13 06:44 ..</div><div class="line">d--------- 2 root root 4096 Jun 12 2014 .bash_history</div><div class="line">-r-sr-x--- 1 fd2 fd 7322 Jun 11 2014 fd</div><div class="line">-rw-r--r-- 1 root root 418 Jun 11 2014 fd.c</div><div class="line">-r--r----- 1 fd2 root 50 Jun 11 2014 flag</div><div class="line">-rw------- 1 root root 80 May 29 09:13 .gdb_history</div><div class="line">dr-xr-xr-x 2 root root 4096 Aug 20 2014 .irssi</div></pre></td></tr></table></figure></p>
<p>代码如下:fd.c<br><figure class="highlight c"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div></pre></td><td class="code"><pre><div class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><stdio.h></span></span></div><div class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><stdlib.h></span></span></div><div class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><string.h></span></span></div><div class="line"><span class="keyword">char</span> buf[<span class="number">32</span>];</div><div class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">(<span class="keyword">int</span> argc, <span class="keyword">char</span>* argv[], <span class="keyword">char</span>* envp[])</span></span>{</div><div class="line"> <span class="keyword">if</span>(argc<<span class="number">2</span>){</div><div class="line"> <span class="built_in">printf</span>(<span class="string">"pass argv[1] a number\n"</span>);</div><div class="line"> <span class="keyword">return</span> <span class="number">0</span>;</div><div class="line"> }</div><div class="line"> <span class="keyword">int</span> fd = atoi( argv[<span class="number">1</span>] ) - <span class="number">0x1234</span>;</div><div class="line"> <span class="keyword">int</span> len = <span class="number">0</span>;</div><div class="line"> len = read(fd, buf, <span class="number">32</span>);</div><div class="line"> <span class="keyword">if</span>(!<span class="built_in">strcmp</span>(<span class="string">"LETMEWIN\n"</span>, buf)){</div><div class="line"> <span class="built_in">printf</span>(<span class="string">"good job :)\n"</span>);</div><div class="line"> system(<span class="string">"/bin/cat flag"</span>);</div><div class="line"> <span class="built_in">exit</span>(<span class="number">0</span>);</div><div class="line"> }</div><div class="line"> <span class="built_in">printf</span>(<span class="string">"learn about Linux file IO\n"</span>);</div><div class="line"> <span class="keyword">return</span> <span class="number">0</span>;</div><div class="line"></div><div class="line">}</div></pre></td></tr></table></figure></p>
<p>因为fd程序具有s权限，我们通过执行fd从而读取flag文件，这样思路就很清晰了。</p>
<p>0x1234 = 4660</p>
<p>执行程序输入4600，从STDIN中读取字符串进入if读取flag.<br><figure class="highlight sh"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">fd@ubuntu:~$ ./fd 4660</div><div class="line">LETMEWIN</div><div class="line">good job :)</div><div class="line">mommy! I think I know what a file descriptor is!!</div></pre></td></tr></table></figure></p>
<p>flag:mommy! I think I know what a file descriptor is!!</p>
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<p>python 中的 datetime库可以很容易的处理时</p>
<p>以一道ctf为例</p>
<blockquote>
<p>September 11, 2003<br>November 2, 2009<br>April 6, 2004<br>May 24, 2007<br>December 25, 2005<br>July 25, 2009<br>September 17, 2015<br>April 3, 2006<br>February 21, 2007<br>June 20, 2016<br>January 1, 2010<br>December 9, 2008<br>October 31, 2009<br>February 20, 2004<br>January 31, 2002<br>March 27, 2016<br>May 16, 2014<br>June 7, 2003<br>February 6, 2013<br>January 28, 2001<br>March 25, 2005<br>March 21, 2001<br>July 8, 2008<br>November 22, 2016</p>
</blockquote>
<p>我们要统计的日期具有这样的性质，它明年的今天，是星期五。<br>所以，我们的思路是读取文件，格式化为datetime对象，判断一年后的今天是否为星期五。</p>
<pre><code class="py"><span class="comment">#coding=utf-8</span>
<span class="keyword">import</span> locale
<span class="keyword">import</span> calendar
<span class="keyword">from</span> datetime <span class="keyword">import</span> datetime
<span class="string">"""
Friday is the best day of the week, and so I really want to know how many Fridays there are in this file. But, with a twist. I want to know how many Fridays there are one year later than each date."""</span>
locale.setlocale(locale.LC_ALL,<span class="string">'en_US.UTF-8'</span>)
calendar.setfirstweekday(calendar.MONDAY)
date_format = <span class="string">"%B %d, %Y"</span>
count = <span class="number">0</span>
<span class="keyword">with</span> open(<span class="string">"date.txt"</span>) <span class="keyword">as</span> date_file:
<span class="keyword">for</span> line <span class="keyword">in</span> date_file:
date_str = line.strip()
date_obj = datetime.strptime(date_str,date_format)
<span class="keyword">if</span> <span class="keyword">not</span> (calendar.isleap(date_obj.year) <span class="keyword">and</span> date_obj.day == <span class="number">29</span>):
date_obj = date_obj.replace(year = date_obj.year +<span class="number">1</span>)
<span class="keyword">if</span> date_obj.isoweekday() == <span class="number">5</span>:
count += <span class="number">1</span>
<span class="keyword">pass</span>
<span class="keyword">elif</span> int(date_obj.strftime(<span class="string">"%m"</span>)) == <span class="number">2</span>:
<span class="keyword">print</span> <span class="string">"find one 2,29"</span>
<span class="keyword">print</span> <span class="string">"abctf{%d}"</span>%(count,)
</code></pre>
<blockquote>
<p>python中时间日期格式化符号：<br>%y 两位数的年份表示（00-99）<br>%Y 四位数的年份表示（000-9999）<br>%m 月份（01-12）<br>%d 月内中的一天（0-31）<br>%H 24小时制小时数（0-23）<br>%I 12小时制小时数（01-12）<br>%M 分钟数（00=59）<br>%S 秒（00-59）<br>%a 本地简化星期名称<br>%A 本地完整星期名称<br>%b 本地简化的月份名称<br>%B 本地完整的月份名称<br>%c 本地相应的日期表示和时间表示<br>%j 年内的一天（001-366）<br>%p 本地A.M.或P.M.的等价符<br>%U 一年中的星期数（00-53）星期天为星期的开始<br>%w 星期（0-6），星期天为星期的开始<br>%W 一年中的星期数（00-53）星期一为星期的开始<br>%x 本地相应的日期表示<br>%X 本地相应的时间表示<br>%Z 当前时区的名称<br>%% %号本身</p>
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<h1 id="一个简单的nginx反向代理服务器的配置"><a href="#一个简单的nginx反向代理服务器的配置" class="headerlink" title="一个简单的nginx反向代理服务器的配置"></a>一个简单的nginx反向代理服务器的配置</h1><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div></pre></td><td class="code"><pre><div class="line">user www-data;</div><div class="line">worker_processes 1;</div><div class="line"></div><div class="line">error_log /var/log/nginx/error.log;</div><div class="line"></div><div class="line">pid /var/run/nginx.pid;</div><div class="line"></div><div class="line">events {</div><div class="line"> use epoll;</div><div class="line"> worker_connections 768;</div><div class="line">}</div><div class="line"></div><div class="line">http {</div><div class="line"> </div><div class="line"> proxy_next_upstream error;</div><div class="line"></div><div class="line"> upstream tornadoes {</div><div class="line"> server 127.0.0.1:8080;</div><div class="line"> }</div><div class="line"></div><div class="line"></div><div class="line"> server {</div><div class="line"> listen 80;</div><div class="line"> server_name wx.foolzz.xyz *.xyz;</div><div class="line"></div><div class="line"> location / {</div><div class="line"> proxy_pass_header Server;</div><div class="line"> proxy_set_header Host $http_host;</div><div class="line"> proxy_redirect off;</div><div class="line"> proxy_set_header X-Real-IP $remote_addr;</div><div class="line"> proxy_set_header X-Scheme $scheme;</div><div class="line"> proxy_pass http://tornadoes;</div><div class="line"> }</div><div class="line"> }</div><div class="line"></div><div class="line">}</div></pre></td></tr></table></figure>
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<h2 id="起因"><a href="#起因" class="headerlink" title="起因"></a>起因</h2><p>因为最近要开发一个网站，在调试的时候要把网站放到公网上，但是放在公网上网站在修改代码时，受到延迟的影响，以及多份代码不利于版本管理，所以想到把本地的http服务器代理到公网上进行调试测试，在这里使用ssh代理</p>
<h2 id="ssh用法简介"><a href="#ssh用法简介" class="headerlink" title="ssh用法简介"></a>ssh用法简介</h2><figure class="highlight sh"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line">➜ ~ ssh</div><div class="line">usage: ssh [-1246AaCfGgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]</div><div class="line"> [-D [bind_address:]port] [-E log_file] [<span class="_">-e</span> escape_char]</div><div class="line"> [-F configfile] [-I pkcs11] [-i identity_file]</div><div class="line"> [-L [bind_address:]port:host:hostport] [<span class="_">-l</span> login_name] [-m mac_spec]</div><div class="line"> [-O ctl_cmd] [-o option] [-p port]</div><div class="line"> [-Q cipher | cipher-auth | mac | kex | key]</div><div class="line"> [-R [bind_address:]port:host:hostport] [-S ctl_path] [-W host:port]</div><div class="line"> [-w local_tun[:remote_tun]] [user@]hostname [<span class="built_in">command</span>]</div></pre></td></tr></table></figure>
<p>这里说几个我们用到的参数：</p>
<p><code>-f 后台运行
-C 启动数据压缩传输
-q 安静模式运行，忽略提示和错误
-N 不执行命令，专为端口转发
-L 正向代理
-R 反向代理</code></p>
<h2 id="正向代理"><a href="#正向代理" class="headerlink" title="正向代理"></a>正向代理</h2><p>[-L [bind_address:]port:host:hostport]</p>
<p>前两个地址和端口 分别为 本地pc所能访问的地址和端口，host以及hostport是ssh服务端能访问的ip和端口<br>所以正向代理的功能就是，把本地访问到bind_address:port的数据代理到host:hostport处</p>
<p>在这里用虚拟机做演示</p>
<p>比如我想把本地的6666端口代理到192.168.31.179的22端口</p>
<p>ssh -fCNL localhost:6666:192.168.31.179:22 [email protected]</p>
<p>这样 当我输入 ssh root@localhost -p 6666的时候，实际上就ssh到了192.168.31.179的22端口上。</p>
<h2 id="反向代理"><a href="#反向代理" class="headerlink" title="反向代理"></a>反向代理</h2><p>[-R [bind_address:]port:host:hostport]</p>
<p>host:hostport是我们本地要代理出去的ip和端口，port就是我们要代理到公网上的端口</p>
<p>比如 我现在想把本地7777端口代理到192.168.31.179的8888端口上</p>
<p>ssh -fCNR 8888:localhost:7777 [email protected]</p>
<p>这样 当我在179的机器上,nc 127.0.0.1 8888的时候，就会访问到我本地的7777端口。</p>
<p>现在可以把我们本地http服务器的端口理解为7777，vps上代理到的端口就是8888，<br>当别人访问到<a href="http://vps_ip:8888端口时，实际上访问到的就是我们本地的http://localhosst:7777了。" target="_blank" rel="external">http://vps_ip:8888端口时，实际上访问到的就是我们本地的http://localhosst:7777了。</a></p>
<h2 id="tips"><a href="#tips" class="headerlink" title="tips"></a>tips</h2><p>ssh反向代理到服务器上的端口，只能由服务器本地访问。<br>比如我把本地的a端口代理到服务器上的b端口，但是b端口只能由服务器本地访问，怎么办。<br>为此我们要再做一次正向代理。把服务器本地端口b代理到服务器本地0.0.0.0:c 端口，这样就相当于内网的服务器成功代理到公网上了。</p>
<h2 id="Practice"><a href="#Practice" class="headerlink" title="Practice"></a>Practice</h2><p>在实践中，我们发现由于ssh连接过程中网络因素的不确定性，我们发现ssh代理经常断掉。好好的自动化代理变成了时不时的我们自己去维护，这一点也不清真！<br>所以，理想总是美好的，现实也是有解决办法的。（解决不了怎么办，自己写一个也要办）</p>
<h2 id="持久化-解决方案-supervisor-autossh"><a href="#持久化-解决方案-supervisor-autossh" class="headerlink" title="持久化 解决方案 supervisor + autossh"></a>持久化 解决方案 supervisor + autossh</h2><p>supervisor是一款进程监视工具，autossh就理解为进化版的ssh吧</p>
<p>我们在本地使用supervisor讲本地端口代理到vps上，在vps上可以用正向代理，也可以用nginx反向代理，具体方法看个人爱好了。</p>
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<p>起因：用了mac之后，看惯了好看的osx字体回头看sublime的字体真心难过的要4，换了一套主题感觉自己又爱上写代码了。就酱。</p>
<p>主题地址<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">https://github.com/YabataDesign/afterglow-theme</div></pre></td></tr></table></figure></p>
<p>我的配色方案</p>
<p>setting - User</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div></pre></td><td class="code"><pre><div class="line">{</div><div class="line"> //"color_scheme": "Packages/Theme - Afterglow/Afterglow.tmTheme",</div><div class="line"> //"color_scheme": "Packages/Theme - Afterglow/Afterglow-monokai.tmTheme",</div><div class="line"> "color_scheme": "Packages/Theme - Afterglow/Afterglow-twilight.tmTheme",</div><div class="line"> "font_size": 15.0,</div><div class="line"> "tabs_small": true,</div><div class="line"> "sidebar_size_14": true,</div><div class="line"> "sidebar_row_padding_large": true,</div><div class="line"> "color_inactive_tabs": true,</div><div class="line"> "theme": "Afterglow-blue.sublime-theme"</div><div class="line">}</div></pre></td></tr></table></figure>
<p>more - setting - User (感觉这个设置可有可无，先酱)</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line"></div><div class="line">{</div><div class="line"> "color_scheme": "Packages/Theme - Afterglow/Afterglow-markdown.tmTheme",</div><div class="line"> "draw_centered": true,</div><div class="line"> "draw_indent_guides": false,</div><div class="line"> "trim_trailing_white_space_on_save": false,</div><div class="line"> "word_wrap": true,</div><div class="line"> "wrap_width": 80 // Sets the # of characters per line</div><div class="line">}</div></pre></td></tr></table></figure>
<p>我觉得我又爱上写代码了。。<br>对于程序猿来说，没有好看的主题好用的工具 简直是对人格的强奸。。</p>
<p>好吧 本来是要写代码的，折腾好久这个了。。为什么程序猿总熬夜。。</p>
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<p>sqlmap 用户手册</p>
<h2 id="介绍"><a href="#介绍" class="headerlink" title="介绍"></a>介绍</h2><h3 id="侦查并利用sql注入"><a href="#侦查并利用sql注入" class="headerlink" title="侦查并利用sql注入"></a>侦查并利用sql注入</h3><p>当你审计web应用并发现一个网页接受由用户提供的动态参数（如GET，POST，COOKIE）时，你想测试是否存在sql注入，并且想尽可能的从后台数据库获取更多的信息甚至是访问文件系统或者是操作系统，你可以这样做，假设目标url是：<br>
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virtualenv
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