如何在Linux中配置sudo访问权限
Linux 系统中 root 用户拥有 Linux 中全部控制权力。Linux 系统中 root 是拥有***权力的用户,可以在系统中实施任意的行为。
如果其他用户想去实施一些行为,不能为所有人都提供 root 访问权限。因为如果他或她做了一些错误的操作,没有办法去纠正它。
为了解决这个问题,有什么方案吗?
我们可以把 sudo 权限发放给相应的用户来克服这种情况。
sudo
命令提供了一种机制,它可以在不用分享 root 用户的密码的前提下,为信任的用户提供系统的管理权限。
他们可以执行大部分的管理操作,但又不像 root 一样有全部的权限。
什么是 sudo?
sudo
是一个程序,普通用户可以使用它以超级用户或其他用户的身份执行命令,是由安全策略指定的。
sudo 用户的访问权限是由 /etc/sudoers
文件控制的。
sudo 用户有什么优点?
在 Linux 系统中,如果你不熟悉一个命令,sudo
是运行它的一个安全方式。
- Linux 系统在
/var/log/secure
和/var/log/auth.log
文件中保留日志,并且你可以验证 sudo 用户实施了哪些行为操作。 - 每一次它都为当前的操作提示输入密码。所以,你将会有时间去验证这个操作是不是你想要执行的。如果你发觉它是不正确的行为,你可以安全地退出而且没有执行此操作。
基于 RHEL 的系统(如 Redhat (RHEL)、 CentOS 和 Oracle Enterprise Linux (OEL))和基于 Debian 的系统(如 Debian、Ubuntu 和 LinuxMint)在这点是不一样的。
我们将会教你如何在本文中提及的两种发行版中执行该操作。
这里有三种方法可以应用于两个发行版本。
- 增加用户到相应的组。基于 RHEL 的系统,我们需要添加用户到
wheel
组。基于 Debain 的系统,我们添加用户到sudo
或admin
组。 - 手动添加用户到
/etc/group
文件中。 - 用
visudo
命令添加用户到/etc/sudoers
文件中。
如何在 RHEL/CentOS/OEL 系统中配置 sudo 访问权限?
在基于 RHEL 的系统中(如 Redhat (RHEL)、 CentOS 和 Oracle Enterprise Linux (OEL)),使用下面的三个方法就可以做到。
方法 1:在 Linux 中如何使用 wheel 组为普通用户授予超级用户访问权限?
wheel 是基于 RHEL 的系统中的一个特殊组,它提供额外的权限,可以授权用户像超级用户一样执行受到限制的命令。
注意,应该在 /etc/sudoers
文件中激活 wheel
组来获得该访问权限。
<span class="com">#</span><span class="pln"> </span><span class="kwd">grep</span><span class="pln"> </span><span class="pun">-</span><span class="pln">i wheel </span><span class="pun">/</span><span class="pln">etc</span><span class="pun">/</span><span class="pln">sudoers</span>
<span class="com">##</span><span class="pln"> </span><span class="typ">Allows</span><span class="pln"> people </span><span class="kwd">in</span><span class="pln"> group wheel to run all commands</span>
<span class="pun">%</span><span class="pln">wheel ALL</span><span class="pun">=(</span><span class="pln">ALL</span><span class="pun">)</span><span class="pln"> ALL</span>
<span class="com">#</span><span class="pln"> </span><span class="pun">%</span><span class="pln">wheel ALL</span><span class="pun">=(</span><span class="pln">ALL</span><span class="pun">)</span><span class="pln"> NOPASSWD</span><span class="pun">:</span><span class="pln"> ALL</span>
假设我们已经创建了一个用户账号来执行这些操作。在此,我将会使用 daygeek
这个用户账号。
执行下面的命令,添加用户到 wheel
组。
<span class="com">#</span><span class="pln"> </span><span class="kwd">usermod</span><span class="pln"> </span><span class="pun">-</span><span class="pln">aG wheel daygeek</span>
我们可以通过下面的命令来确定这一点。
<span class="com">#</span><span class="pln"> getent group wheel</span>
<span class="pln">wheel</span><span class="pun">:</span><span class="pln">x</span><span class="pun">:</span><span class="lit">10</span><span class="pun">:</span><span class="pln">daygeek</span>
我将要检测用户 daygeek
是否可以访问属于 root 用户的文件。
<span class="pln">$ </span><span class="kwd">tail</span><span class="pln"> </span><span class="pun">-</span><span class="lit">5</span><span class="pln"> </span><span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">secure</span>
<span class="kwd">tail</span><span class="pun">:</span><span class="pln"> cannot open </span><span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">secure </span><span class="kwd">for</span><span class="pln"> reading</span><span class="pun">:</span><span class="pln"> </span><span class="typ">Permission</span><span class="pln"> denied</span>
当我试图以普通用户身份访问 /var/log/secure
文件时出现错误。 我将使用 sudo
访问同一个文件,让我们看看这个魔术。
<span class="pln">$ </span><span class="kwd">sudo</span><span class="pln"> </span><span class="kwd">tail</span><span class="pln"> </span><span class="pun">-</span><span class="lit">5</span><span class="pln"> </span><span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">secure</span>
<span class="pun">[</span><span class="kwd">sudo</span><span class="pun">]</span><span class="pln"> password </span><span class="kwd">for</span><span class="pln"> daygeek</span><span class="pun">:</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">07</span><span class="pun">:</span><span class="lit">01</span><span class="pun">:</span><span class="lit">56</span><span class="pln"> </span><span class="typ">CentOS7</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> daygeek </span><span class="pun">:</span><span class="pln"> TTY</span><span class="pun">=</span><span class="pln">pts</span><span class="pun">/</span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> PWD</span><span class="pun">=</span><span class="str">/home/</span><span class="pln">daygeek </span><span class="pun">;</span><span class="pln"> USER</span><span class="pun">=</span><span class="pln">root </span><span class="pun">;</span><span class="pln"> COMMAND</span><span class="pun">=</span><span class="str">/bin/</span><span class="kwd">tail</span><span class="pln"> </span><span class="pun">-</span><span class="lit">5</span><span class="pln"> </span><span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">secure</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">07</span><span class="pun">:</span><span class="lit">01</span><span class="pun">:</span><span class="lit">56</span><span class="pln"> </span><span class="typ">CentOS7</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> pam_unix</span><span class="pun">(</span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln">session</span><span class="pun">):</span><span class="pln"> session opened </span><span class="kwd">for</span><span class="pln"> user root by daygeek</span><span class="pun">(</span><span class="pln">uid</span><span class="pun">=</span><span class="lit">0</span><span class="pun">)</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">07</span><span class="pun">:</span><span class="lit">01</span><span class="pun">:</span><span class="lit">56</span><span class="pln"> </span><span class="typ">CentOS7</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> pam_unix</span><span class="pun">(</span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln">session</span><span class="pun">):</span><span class="pln"> session closed </span><span class="kwd">for</span><span class="pln"> user root</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">07</span><span class="pun">:</span><span class="lit">05</span><span class="pun">:</span><span class="lit">10</span><span class="pln"> </span><span class="typ">CentOS7</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> daygeek </span><span class="pun">:</span><span class="pln"> TTY</span><span class="pun">=</span><span class="pln">pts</span><span class="pun">/</span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> PWD</span><span class="pun">=</span><span class="str">/home/</span><span class="pln">daygeek </span><span class="pun">;</span><span class="pln"> USER</span><span class="pun">=</span><span class="pln">root </span><span class="pun">;</span><span class="pln"> COMMAND</span><span class="pun">=</span><span class="str">/bin/</span><span class="kwd">tail</span><span class="pln"> </span><span class="pun">-</span><span class="lit">5</span><span class="pln"> </span><span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">secure</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">07</span><span class="pun">:</span><span class="lit">05</span><span class="pun">:</span><span class="lit">10</span><span class="pln"> </span><span class="typ">CentOS7</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> pam_unix</span><span class="pun">(</span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln">session</span><span class="pun">):</span><span class="pln"> session opened </span><span class="kwd">for</span><span class="pln"> user root by daygeek</span><span class="pun">(</span><span class="pln">uid</span><span class="pun">=</span><span class="lit">0</span><span class="pun">)</span>
方法 2:在 RHEL/CentOS/OEL 中如何使用 /etc/group 文件为普通用户授予超级用户访问权限?
我们可以通过编辑 /etc/group
文件来手动地添加用户到 wheel
组。
只需打开该文件,并在恰当的组后追加相应的用户就可完成这一点。
<span class="pln">$ </span><span class="kwd">grep</span><span class="pln"> </span><span class="pun">-</span><span class="pln">i wheel </span><span class="pun">/</span><span class="pln">etc</span><span class="pun">/</span><span class="pln">group</span>
<span class="pln">wheel</span><span class="pun">:</span><span class="pln">x</span><span class="pun">:</span><span class="lit">10</span><span class="pun">:</span><span class="pln">daygeek</span><span class="pun">,</span><span class="pln">user1</span>
在该例中,我将使用 user1
这个用户账号。
我将要通过在系统中重启 Apache httpd 服务来检查用户 user1
是不是拥有 sudo 访问权限。让我们看看这个魔术。
<span class="pln">$ </span><span class="kwd">sudo</span><span class="pln"> </span><span class="kwd">systemctl</span><span class="pln"> restart httpd</span>
<span class="pun">[</span><span class="kwd">sudo</span><span class="pun">]</span><span class="pln"> password </span><span class="kwd">for</span><span class="pln"> user1</span><span class="pun">:</span>
<span class="pln">$ </span><span class="kwd">sudo</span><span class="pln"> </span><span class="kwd">grep</span><span class="pln"> </span><span class="pun">-</span><span class="pln">i user1 </span><span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">secure</span>
<span class="pun">[</span><span class="kwd">sudo</span><span class="pun">]</span><span class="pln"> password </span><span class="kwd">for</span><span class="pln"> user1</span><span class="pun">:</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">07</span><span class="pun">:</span><span class="lit">09</span><span class="pun">:</span><span class="lit">47</span><span class="pln"> </span><span class="typ">CentOS7</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> user1 </span><span class="pun">:</span><span class="pln"> TTY</span><span class="pun">=</span><span class="pln">pts</span><span class="pun">/</span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> PWD</span><span class="pun">=</span><span class="str">/home/</span><span class="pln">user1 </span><span class="pun">;</span><span class="pln"> USER</span><span class="pun">=</span><span class="pln">root </span><span class="pun">;</span><span class="pln"> COMMAND</span><span class="pun">=</span><span class="str">/bin/</span><span class="kwd">systemctl</span><span class="pln"> restart httpd</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">07</span><span class="pun">:</span><span class="lit">10</span><span class="pun">:</span><span class="lit">40</span><span class="pln"> </span><span class="typ">CentOS7</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> user1 </span><span class="pun">:</span><span class="pln"> TTY</span><span class="pun">=</span><span class="pln">pts</span><span class="pun">/</span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> PWD</span><span class="pun">=</span><span class="str">/home/</span><span class="pln">user1 </span><span class="pun">;</span><span class="pln"> USER</span><span class="pun">=</span><span class="pln">root </span><span class="pun">;</span><span class="pln"> COMMAND</span><span class="pun">=</span><span class="str">/bin/</span><span class="kwd">systemctl</span><span class="pln"> restart httpd</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">07</span><span class="pun">:</span><span class="lit">12</span><span class="pun">:</span><span class="lit">35</span><span class="pln"> </span><span class="typ">CentOS7</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> user1 </span><span class="pun">:</span><span class="pln"> TTY</span><span class="pun">=</span><span class="pln">pts</span><span class="pun">/</span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> PWD</span><span class="pun">=</span><span class="str">/home/</span><span class="pln">user1 </span><span class="pun">;</span><span class="pln"> USER</span><span class="pun">=</span><span class="pln">root </span><span class="pun">;</span><span class="pln"> COMMAND</span><span class="pun">=</span><span class="str">/bin/</span><span class="kwd">grep</span><span class="pln"> </span><span class="pun">-</span><span class="pln">i httpd </span><span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">secure</span>
方法 3:在 Linux 中如何使用 /etc/sudoers 文件为普通用户授予超级用户访问权限?
sudo 用户的访问权限是被 /etc/sudoers
文件控制的。因此,只需将用户添加到 sudoers
文件中 的 wheel
组下即可。
只需通过 visudo
命令将期望的用户追加到 /etc/sudoers
文件中。
<span class="com">#</span><span class="pln"> </span><span class="kwd">grep</span><span class="pln"> </span><span class="pun">-</span><span class="pln">i user2 </span><span class="pun">/</span><span class="pln">etc</span><span class="pun">/</span><span class="pln">sudoers</span>
<span class="pln">user2 ALL</span><span class="pun">=(</span><span class="pln">ALL</span><span class="pun">)</span><span class="pln"> ALL</span>
在该例中,我将使用 user2
这个用户账号。
我将要通过在系统中重启 MariaDB 服务来检查用户 user2
是不是拥有 sudo 访问权限。让我们看看这个魔术。
<span class="pln">$ </span><span class="kwd">sudo</span><span class="pln"> </span><span class="kwd">systemctl</span><span class="pln"> restart mariadb</span>
<span class="pun">[</span><span class="kwd">sudo</span><span class="pun">]</span><span class="pln"> password </span><span class="kwd">for</span><span class="pln"> user2</span><span class="pun">:</span>
<span class="pln">$ </span><span class="kwd">sudo</span><span class="pln"> </span><span class="kwd">grep</span><span class="pln"> </span><span class="pun">-</span><span class="pln">i mariadb </span><span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">secure</span>
<span class="pun">[</span><span class="kwd">sudo</span><span class="pun">]</span><span class="pln"> password </span><span class="kwd">for</span><span class="pln"> user2</span><span class="pun">:</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">07</span><span class="pun">:</span><span class="lit">23</span><span class="pun">:</span><span class="lit">10</span><span class="pln"> </span><span class="typ">CentOS7</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> user2 </span><span class="pun">:</span><span class="pln"> TTY</span><span class="pun">=</span><span class="pln">pts</span><span class="pun">/</span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> PWD</span><span class="pun">=</span><span class="str">/home/</span><span class="pln">user2 </span><span class="pun">;</span><span class="pln"> USER</span><span class="pun">=</span><span class="pln">root </span><span class="pun">;</span><span class="pln"> COMMAND</span><span class="pun">=</span><span class="str">/bin/</span><span class="kwd">systemctl</span><span class="pln"> restart mariadb</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">07</span><span class="pun">:</span><span class="lit">26</span><span class="pun">:</span><span class="lit">52</span><span class="pln"> </span><span class="typ">CentOS7</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> user2 </span><span class="pun">:</span><span class="pln"> TTY</span><span class="pun">=</span><span class="pln">pts</span><span class="pun">/</span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> PWD</span><span class="pun">=</span><span class="str">/home/</span><span class="pln">user2 </span><span class="pun">;</span><span class="pln"> USER</span><span class="pun">=</span><span class="pln">root </span><span class="pun">;</span><span class="pln"> COMMAND</span><span class="pun">=</span><span class="str">/bin/</span><span class="kwd">grep</span><span class="pln"> </span><span class="pun">-</span><span class="pln">i mariadb </span><span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">secure</span>
在 Debian/Ubuntu 系统中如何配置 sudo 访问权限?
在基于 Debian 的系统中(如 Debian、Ubuntu 和 LinuxMint),使用下面的三个方法就可以做到。
方法 1:在 Linux 中如何使用 sudo 或 admin 组为普通用户授予超级用户访问权限?
sudo
或 admin
是基于 Debian 的系统中的特殊组,它提供额外的权限,可以授权用户像超级用户一样执行受到限制的命令。
注意,应该在 /etc/sudoers
文件中激活 sudo
或 admin
组来获得该访问权限。
<span class="com">#</span><span class="pln"> </span><span class="kwd">grep</span><span class="pln"> </span><span class="pun">-</span><span class="pln">i </span><span class="str">'sudo\|admin'</span><span class="pln"> </span><span class="pun">/</span><span class="pln">etc</span><span class="pun">/</span><span class="pln">sudoers</span>
<span class="com">#</span><span class="pln"> </span><span class="typ">Members</span><span class="pln"> of the admin group may gain root privileges</span>
<span class="pun">%</span><span class="pln">admin ALL</span><span class="pun">=(</span><span class="pln">ALL</span><span class="pun">)</span><span class="pln"> ALL</span>
<span class="com">#</span><span class="pln"> </span><span class="typ">Allow</span><span class="pln"> members of group </span><span class="kwd">sudo</span><span class="pln"> to execute any command</span>
<span class="pun">%</span><span class="kwd">sudo</span><span class="pln"> ALL</span><span class="pun">=(</span><span class="pln">ALL</span><span class="pun">:</span><span class="pln">ALL</span><span class="pun">)</span><span class="pln"> ALL</span>
假设我们已经创建了一个用户账号来执行这些操作。在此,我将会使用 2gadmin
这个用户账号。
执行下面的命令,添加用户到 sudo
组。
<span class="com">#</span><span class="pln"> </span><span class="kwd">usermod</span><span class="pln"> </span><span class="pun">-</span><span class="pln">aG </span><span class="kwd">sudo</span><span class="pln"> </span><span class="lit">2gadmin</span>
我们可以通过下面的命令来确定这一点。
<span class="com">#</span><span class="pln"> getent group </span><span class="kwd">sudo</span>
<span class="kwd">sudo</span><span class="pun">:</span><span class="pln">x</span><span class="pun">:</span><span class="lit">27</span><span class="pun">:</span><span class="lit">2gadmin</span>
我将要检测用户 2gadmin
是否可以访问属于 root 用户的文件。
<span class="pln">$ </span><span class="kwd">less</span><span class="pln"> </span><span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">auth</span><span class="pun">.</span><span class="pln">log</span>
<span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">auth</span><span class="pun">.</span><span class="pln">log</span><span class="pun">:</span><span class="pln"> </span><span class="typ">Permission</span><span class="pln"> denied</span>
当我试图以普通用户身份访问 /var/log/auth.log
文件时出现错误。 我将要使用 sudo
访问同一个文件,让我们看看这个魔术。
<span class="pln">$ </span><span class="kwd">sudo</span><span class="pln"> </span><span class="kwd">tail</span><span class="pln"> </span><span class="pun">-</span><span class="lit">5</span><span class="pln"> </span><span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">auth</span><span class="pun">.</span><span class="pln">log</span>
<span class="pun">[</span><span class="kwd">sudo</span><span class="pun">]</span><span class="pln"> password </span><span class="kwd">for</span><span class="pln"> </span><span class="lit">2gadmin</span><span class="pun">:</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">20</span><span class="pun">:</span><span class="lit">39</span><span class="pun">:</span><span class="lit">47</span><span class="pln"> </span><span class="typ">Ubuntu18</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> </span><span class="lit">2gadmin</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> TTY</span><span class="pun">=</span><span class="pln">pts</span><span class="pun">/</span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> PWD</span><span class="pun">=</span><span class="str">/home/</span><span class="lit">2gadmin</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> USER</span><span class="pun">=</span><span class="pln">root </span><span class="pun">;</span><span class="pln"> COMMAND</span><span class="pun">=</span><span class="str">/bin/</span><span class="kwd">bash</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">20</span><span class="pun">:</span><span class="lit">39</span><span class="pun">:</span><span class="lit">47</span><span class="pln"> </span><span class="typ">Ubuntu18</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> pam_unix</span><span class="pun">(</span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln">session</span><span class="pun">):</span><span class="pln"> session opened </span><span class="kwd">for</span><span class="pln"> user root by </span><span class="lit">2gadmin</span><span class="pun">(</span><span class="pln">uid</span><span class="pun">=</span><span class="lit">0</span><span class="pun">)</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">20</span><span class="pun">:</span><span class="lit">40</span><span class="pun">:</span><span class="lit">23</span><span class="pln"> </span><span class="typ">Ubuntu18</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> pam_unix</span><span class="pun">(</span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln">session</span><span class="pun">):</span><span class="pln"> session closed </span><span class="kwd">for</span><span class="pln"> user root</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">20</span><span class="pun">:</span><span class="lit">40</span><span class="pun">:</span><span class="lit">48</span><span class="pln"> </span><span class="typ">Ubuntu18</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> </span><span class="lit">2gadmin</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> TTY</span><span class="pun">=</span><span class="pln">pts</span><span class="pun">/</span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> PWD</span><span class="pun">=</span><span class="str">/home/</span><span class="lit">2gadmin</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> USER</span><span class="pun">=</span><span class="pln">root </span><span class="pun">;</span><span class="pln"> COMMAND</span><span class="pun">=</span><span class="str">/usr/</span><span class="pln">bin</span><span class="pun">/</span><span class="kwd">tail</span><span class="pln"> </span><span class="pun">-</span><span class="lit">5</span><span class="pln"> </span><span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">auth</span><span class="pun">.</span><span class="pln">log</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">20</span><span class="pun">:</span><span class="lit">40</span><span class="pun">:</span><span class="lit">48</span><span class="pln"> </span><span class="typ">Ubuntu18</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> pam_unix</span><span class="pun">(</span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln">session</span><span class="pun">):</span><span class="pln"> session opened </span><span class="kwd">for</span><span class="pln"> user root by </span><span class="lit">2gadmin</span><span class="pun">(</span><span class="pln">uid</span><span class="pun">=</span><span class="lit">0</span><span class="pun">)</span>
或者,我们可以通过添加用户到 admin
组来执行相同的操作。
运行下面的命令,添加用户到 admin
组。
<span class="com">#</span><span class="pln"> </span><span class="kwd">usermod</span><span class="pln"> </span><span class="pun">-</span><span class="pln">aG admin user1</span>
我们可以通过下面的命令来确定这一点。
<span class="com">#</span><span class="pln"> getent group admin</span>
<span class="pln">admin</span><span class="pun">:</span><span class="pln">x</span><span class="pun">:</span><span class="lit">1011</span><span class="pun">:</span><span class="pln">user1</span>
让我们看看输出信息。
<span class="pln">$ </span><span class="kwd">sudo</span><span class="pln"> </span><span class="kwd">tail</span><span class="pln"> </span><span class="pun">-</span><span class="lit">2</span><span class="pln"> </span><span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">auth</span><span class="pun">.</span><span class="pln">log</span>
<span class="pun">[</span><span class="kwd">sudo</span><span class="pun">]</span><span class="pln"> password </span><span class="kwd">for</span><span class="pln"> user1</span><span class="pun">:</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">20</span><span class="pun">:</span><span class="lit">53</span><span class="pun">:</span><span class="lit">36</span><span class="pln"> </span><span class="typ">Ubuntu18</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> user1 </span><span class="pun">:</span><span class="pln"> TTY</span><span class="pun">=</span><span class="pln">pts</span><span class="pun">/</span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> PWD</span><span class="pun">=</span><span class="str">/home/</span><span class="pln">user1 </span><span class="pun">;</span><span class="pln"> USER</span><span class="pun">=</span><span class="pln">root </span><span class="pun">;</span><span class="pln"> COMMAND</span><span class="pun">=</span><span class="str">/usr/</span><span class="pln">bin</span><span class="pun">/</span><span class="kwd">tail</span><span class="pln"> </span><span class="pun">-</span><span class="lit">2</span><span class="pln"> </span><span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">auth</span><span class="pun">.</span><span class="pln">log</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">20</span><span class="pun">:</span><span class="lit">53</span><span class="pun">:</span><span class="lit">36</span><span class="pln"> </span><span class="typ">Ubuntu18</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> pam_unix</span><span class="pun">(</span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln">session</span><span class="pun">):</span><span class="pln"> session opened </span><span class="kwd">for</span><span class="pln"> user root by user1</span><span class="pun">(</span><span class="pln">uid</span><span class="pun">=</span><span class="lit">0</span><span class="pun">)</span>
方法 2:在 Debian/Ubuntu 中如何使用 /etc/group 文件为普通用户授予超级用户访问权限?
我们可以通过编辑 /etc/group
文件来手动地添加用户到 sudo
组或 admin
组。
只需打开该文件,并在恰当的组后追加相应的用户就可完成这一点。
<span class="pln">$ </span><span class="kwd">grep</span><span class="pln"> </span><span class="pun">-</span><span class="pln">i </span><span class="kwd">sudo</span><span class="pln"> </span><span class="pun">/</span><span class="pln">etc</span><span class="pun">/</span><span class="pln">group</span>
<span class="kwd">sudo</span><span class="pun">:</span><span class="pln">x</span><span class="pun">:</span><span class="lit">27</span><span class="pun">:</span><span class="lit">2gadmin</span><span class="pun">,</span><span class="pln">user2</span>
在该例中,我将使用 user2
这个用户账号。
我将要通过在系统中重启 Apache httpd 服务来检查用户 user2
是不是拥有 sudo
访问权限。让我们看看这个魔术。
<span class="pln">$ </span><span class="kwd">sudo</span><span class="pln"> </span><span class="kwd">systemctl</span><span class="pln"> restart apache2</span>
<span class="pun">[</span><span class="kwd">sudo</span><span class="pun">]</span><span class="pln"> password </span><span class="kwd">for</span><span class="pln"> user2</span><span class="pun">:</span>
<span class="pln">$ </span><span class="kwd">sudo</span><span class="pln"> </span><span class="kwd">tail</span><span class="pln"> </span><span class="pun">-</span><span class="pln">f </span><span class="pun">/</span><span class="kwd">var</span><span class="pun">/</span><span class="pln">log</span><span class="pun">/</span><span class="pln">auth</span><span class="pun">.</span><span class="pln">log</span>
<span class="pun">[</span><span class="kwd">sudo</span><span class="pun">]</span><span class="pln"> password </span><span class="kwd">for</span><span class="pln"> user2</span><span class="pun">:</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">21</span><span class="pun">:</span><span class="lit">01</span><span class="pun">:</span><span class="lit">04</span><span class="pln"> </span><span class="typ">Ubuntu18</span><span class="pln"> </span><span class="kwd">systemd</span><span class="pun">-</span><span class="pln">logind</span><span class="pun">[</span><span class="lit">559</span><span class="pun">]:</span><span class="pln"> </span><span class="typ">New</span><span class="pln"> session </span><span class="lit">22</span><span class="pln"> of user user2</span><span class="pun">.</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">21</span><span class="pun">:</span><span class="lit">01</span><span class="pun">:</span><span class="lit">04</span><span class="pln"> </span><span class="typ">Ubuntu18</span><span class="pln"> </span><span class="kwd">systemd</span><span class="pun">:</span><span class="pln"> pam_unix</span><span class="pun">(</span><span class="kwd">systemd</span><span class="pun">-</span><span class="pln">user</span><span class="pun">:</span><span class="pln">session</span><span class="pun">):</span><span class="pln"> session opened </span><span class="kwd">for</span><span class="pln"> user user2 by </span><span class="pun">(</span><span class="pln">uid</span><span class="pun">=</span><span class="lit">0</span><span class="pun">)</span>
<span class="typ">Mar</span><span class="pln"> </span><span class="lit">17</span><span class="pln"> </span><span class="lit">21</span><span class="pun">:</span><span class="lit">01</span><span class="pun">:</span><span class="lit">33</span><span class="pln"> </span><span class="typ">Ubuntu18</span><span class="pln"> </span><span class="kwd">sudo</span><span class="pun">:</span><span class="pln"> user2 </span><span class="pun">:</span><span class="pln"> TTY</span><span class="pun">=</span><span class="pln">pts</span><span class="pun">/</span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> PWD</span><span class="pun">=</span><span class="str">/home/</span><span class="pln">user2 </span><span class="pun">;</span><span class="pln"> USER</span><span class="pun">=</span><span class="pln">root </span><span class="pun">;</span><span class="pln"> COMMAND</span><span class="pun">=</span><span class="str">/bin/</span><span class="kwd">systemctl</span><span class="pln"> restart apache2</span>
方法 3:在 Linux 中如何使用 /etc/sudoers 文件为普通用户授予超级用户访问权限?
sudo 用户的访问权限是被 /etc/sudoers
文件控制的。因此,只需将用户添加到 sudoers