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<h1 class="hx:mb-0 hx:text-4xl hx:font-bold hx:tracking-tight hx:text-slate-900 hx:dark:text-slate-100">免密码使用sudo</h1>
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<div class="hx:mt-4 hx:mb-16 hx:text-gray-500 hx:dark:text-gray-400 hx:text-sm hx:flex hx:items-center hx:flex-wrap hx:gap-y-2"><span class="hx:mr-1">2021/06/30</span><span class="hx:mx-1">·</span><a href="/about" class="hx:mx-1 hx:hover:underline">Kushidou</a></div>
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<p>记录一种可以免密码使用sudo的方法。</p>
<p>每次使用sudo提权,常常要输密码太烦了,所以想给自己赋予免密码的特权。</p>
<ol>
<li>
<p>首先登录root用户: <code>sudo -i</code></p>
</li>
<li>
<p>这个操作的核心文件是<code>/etc/sudoers</code>,可以看到这个文件是只读的,要修改他需要先赋予写入权限。</p>
</li>
</ol>
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>chmod <span style="color:#ae81ff">666</span> /etc/sudoers</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
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title="复制代码"
aria-label="复制代码"
data-copied-label="已复制!"
>
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<p><img src="https://cdn.jsdelivr.net/gh/kushidou/PicLibrary/img/20210705092601.png" alt="文件是只读权限" loading="lazy" /></p>
<ol start="3">
<li>使用vim修改文件,<code>vi /etc/sudoers</code>,把当前用户和用户组加入,如图</li>
</ol>
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span><span style="color:#75715e"># 表示为该用户免密码</span>
</span></span><span style="display:flex;"><span>yourname ALL<span style="color:#f92672">=(</span>ALL:ALL<span style="color:#f92672">)</span> NOPASSWD:ALL
</span></span><span style="display:flex;"><span><span style="color:#75715e"># 表示为该用户组免密码</span>
</span></span><span style="display:flex;"><span>%yourname ALL<span style="color:#f92672">=(</span>ALL:ALL<span style="color:#f92672">)</span> NOPASSWD:ALL
</span></span><span style="display:flex;"><span><span style="color:#75715e"># 不用严格按照次形式,与你的这个文件中root的格式对应即可。</span></span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
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data-copied-label="已复制!"
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<ol start="4">
<li><code>:wq</code>保存,把sodoers改回只读</li>
</ol>
<div class="hextra-code-block hx:relative hx:mt-6 hx:first:mt-0 hx:group/code">
<div><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>chmod <span style="color:#ae81ff">440</span> /etc/sudoers</span></span></code></pre></div></div><div class="hextra-code-copy-btn-container hx:opacity-0 hx:transition hx:group-hover/code:opacity-100 hx:flex hx:gap-1 hx:absolute hx:m-[11px] hx:right-0 hx:top-0">
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class="hextra-code-copy-btn hx:group/copybtn hx:cursor-pointer hx:transition-all hx:active:opacity-50 hx:bg-primary-700/5 hx:border hx:border-black/5 hx:text-gray-600 hx:hover:text-gray-900 hx:rounded-md hx:p-1.5 hx:dark:bg-primary-300/10 hx:dark:border-white/10 hx:dark:text-gray-400 hx:dark:hover:text-gray-50"
title="复制代码"
aria-label="复制代码"
data-copied-label="已复制!"
>
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<p><img src="https://cdn.jsdelivr.net/gh/kushidou/PicLibrary/img/20210705092637.png" alt="文件修改的内容" loading="lazy" /></p>
<ol start="5">
<li>完成~~~ 把终端关掉再次打开就应该能看到效果了。</li>
</ol>
<blockquote>
<p><strong>PS. 不可使用sudo chmod</strong></p>
<p>一定要直接sudo -i进入root用户,如果使用sudo chmod以普通用户的身份修改sudoers文件的话,改完会发现无法使用sudo指令把权限改回去了,提示“任何人可读写,无法找到有效的sudoers”。其实还有一种更加安全的操作,但是那个编辑器用起来没有vim顺手,</p>
</blockquote>
<p>参考:https://blog.csdn.net/wxqee/article/details/72718869</p>
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