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<span class="article-type type-1 float-left">原</span> <h1 class="title-article">单点登录的微服务实现</h1>
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<span class="time">2018年03月15日 18:01:05</span>
<a class="follow-nickName" href="https://me.youkuaiyun.com/fwk19840301" target="_blank">javafanwk</a>
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<a class="tag-link" href="https://blog.youkuaiyun.com/fwk19840301/article/category/7503660" target="_blank">token认证 </a>
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版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.youkuaiyun.com/fwk19840301/article/details/79525558 </div>
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<h2><a name="t0"></a>登录机制</h2><p style="color:rgb(51,51,51);line-height:26px;font-family:Arial;font-size:14px;">粗略地分析， 登录机制主要分为登录验证、登录保持、登出三个部分。登录验证是指客户端提供用户名和密码，向服务器提出登录请求，服务器判断客户端是否可以登录并向客户端确认。 登录认保持是指客户端登录后， 服务器能够分辨出已登录的客户端，并为其持续提供登录权限的服务器。登出是指客户端主动退出登录状态。容易想到的方案是，客户端登录成功后， 服务器为其分配sessionId, 客户端随后每次请求资源时都带上sessionId。</p><p style="color:rgb(51,51,51);line-height:26px;font-family:Arial;font-size:14px;"><a href="http://nmgfrank.com/wp-content/uploads/2015/07/simple_flow.png" rel="nofollow" style="color:rgb(51,102,153);text-decoration:none;" target="_blank"><img class="wp-image-398 aligncenter" alt="simple_flow" src="http://nmgfrank.com/wp-content/uploads/2015/07/simple_flow-300x191.png" style="border:;"><br></a></p><p style="color:rgb(51,51,51);line-height:26px;font-family:Arial;font-size:14px;"><a href="http://nmgfrank.com/wp-content/uploads/2015/07/simple_flow.png" rel="nofollow" style="color:rgb(51,102,153);text-decoration:none;" target="_blank"></a></p><h2 style="color:rgb(51,51,51);line-height:26px;font-family:Arial;"><a name="t1"></a>登录保持</h2><p style="color:rgb(51,51,51);line-height:26px;font-family:Arial;font-size:14px;">在最原始的方案中， 登录保持仅仅靠服务器生成的sessionId: 客户端的请求中带上sessionId, 如果服务器的redis中存在这个id，就认为请求来自相应的登录客户端。 但是只要sessionId被截获， 请求就可以为伪造， 存在安全隐患。</p><p style="color:rgb(51,51,51);line-height:26px;font-family:Arial;font-size:14px;">引入token后，上述问题便可得到解决。 服务器将token和其它的一些变量， 利用散列加密<a title="算法与数据结构知识库" class="replace_word" href="http://lib.youkuaiyun.com/base/31" rel="nofollow" style="color:rgb(223,52,52);font-weight:bold;text-decoration:none;" target="_blank">算法</a>得到签名后，加密的方法有</p><pre onclick="hljs.copyCode(event)"><code class="language-html hljs xml"><ol class="hljs-ln"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">#ldap.auth.password.encryption.algorithm=BCRYPT</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> #ldap.auth.password.encryption.algorithm=MD2</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> #ldap.auth.password.encryption.algorithm=MD5</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> ldap.auth.password.encryption.algorithm=NONE</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> #ldap.auth.password.encryption.algorithm=SHA</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> #ldap.auth.password.encryption.algorithm=SHA-256</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> #ldap.auth.password.encryption.algorithm=SHA-384</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> #ldap.auth.password.encryption.algorithm=SSHA</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="9"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> #ldap.auth.password.encryption.algorithm=UFC-CRYPT</div></div></li></ol></code><div class="hljs-button" data-title="复制"></div></pre><pre onclick="hljs.copyCode(event)"><code class="language-html hljs xml"> #ldap.auth.password.encryption.algorithm=PBKDF2WithHmacSHA1/160/128000</code><div class="hljs-button" data-title="复制"></div></pre><p>，连同sessionId一并发送给服务器； 服务器取出保存于服务器端的token,利用相同的法则生成校验签名， 如果客户端签名与服务器的校验签名一致， 就认为请求来自登录的客户端。</p><p><a href="http://nmgfrank.com/wp-content/uploads/2015/07/keep_login.png" rel="nofollow" style="color:rgb(51,102,153);text-decoration:none;" target="_blank"><img class="wp-image-406 aligncenter" alt="keep_login" src="http://nmgfrank.com/wp-content/uploads/2015/07/keep_login-300x131.png" style="border:;"></a></p><h3 style="color:rgb(51,51,51);line-height:26px;font-family:Arial;font-size:14px;"> <br></h3><h3><a name="t3"></a>其他：token的保存</h3><p><a href="http://nmgfrank.com/wp-content/uploads/2015/07/simple_flow.png" rel="nofollow" style="color:rgb(51,102,153);text-decoration:none;" target="_blank"></a></p><p>1.cookie 早些时候,本地存储使用的是 cookie。但是Web 存储需要更加的安全与快速. 这些数据不会被保存在服务器上，但是这些数据只用于用户请求网站数据上.它也可以存储大量的数据，而不影响网站的性能.数据以 键/值 对存在, web网页的数据只允许该网页访问使用。<br></p><p><a href="http://nmgfrank.com/wp-content/uploads/2015/07/simple_flow.png" rel="nofollow" style="color:rgb(51,102,153);text-decoration:none;" target="_blank"></a></p><p>2.localStorage - 没有时间限制的数据存储</p><p style="color:rgb(51,51,51);line-height:26px;font-family:Arial;font-size:14px;">3.sessionStorage - 针对一个 session 的数据存储（<strong>关闭窗口，存储的数据清空</strong>）<br></p><p> </p><p> <span style="color:#999999;">介绍setItem和getItem，还有什么removeItem删除key、clear清除所有的key/value操作。</span></p><h4> setItem存储value</h4><p> 用途：将value存储到key字段<br> 用法：.setItem( key, value)<br> 代码示例：</p><div><div><pre> sessionStorage.<span style="color:rgb(102,0,102);">setItem<span style="color:rgb(0,153,0);">(<span style="color:rgb(51,102,204);">"key"<span style="color:rgb(51,153,51);">, <span style="color:rgb(51,102,204);">"value"<span style="color:rgb(0,153,0);">)<span style="color:rgb(51,153,51);">; localStorage.<span style="color:rgb(102,0,102);">setItem<span style="color:rgb(0,153,0);">(<span style="color:rgb(51,102,204);">"site"<span style="color:rgb(51,153,51);">, <span style="color:#3366cc;">"js8.in"<span>)<span style="color:#339933;">;</span></span></span></span></span></span></span></span></span></span></span></span></span></span></pre></div></div><h4> getItem获取value</h4><p> 用途：获取指定key本地存储的值<br> 用法：.getItem(key)<br> 代码示例：</p><div><div><pre> <span style="color:rgb(0,51,102);font-weight:bold;">var value <span style="color:rgb(51,153,51);">= sessionStorage.<span style="color:rgb(102,0,102);">getItem<span style="color:rgb(0,153,0);">(<span style="color:rgb(51,102,204);">"key"<span style="color:rgb(0,153,0);">)<span style="color:rgb(51,153,51);">; <span style="color:rgb(0,51,102);font-weight:bold;">var site <span style="color:rgb(51,153,51);">= localStorage.<span style="color:rgb(102,0,102);">getItem<span style="color:rgb(0,153,0);">(<span style="color:#3366cc;">"site"<span>)<span style="color:#339933;">;</span></span></span></span></span></span></span></span></span></span></span></span></span></span></pre></div></div><div><div><pre></pre></div></div> </div>
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