如何让我的 bash 脚本为给定用户创建一个 ssh 密钥对

Question

我是 bash 脚本的新手。我编写了一个可以创建组和用户的脚本，它工作得很好，但我现在的挑战是如何让脚本为特定用户创建一个 ssh 密钥对。在我的脚本中，它在您切换到该用户后立即停止工作，并且不会继续创建 ssh 密钥对。

下面是我的脚本。

    for group in admin support engineering
    do
            sudo groupadd $group
            sudo useradd -m -s /bin/bash achebeh_${group}
    done
    sudo passwd achebeh_admin
    sudo su achebeh_admin
    ssh-keygen -t rsa

那么，我该如何使用这个脚本为 achebeh_admin 用户创建一个 ssh 对。我愿意学习。请这是我学习完教程课程后的第一个脚本。

Answer 1

@Achebe-peter 如果我从您的简短描述中正确地得到了您的要求，这将为您完成工作。

笔记：

• 在测试环境中尝试此脚本，风险自负！
• 假设您没有配置用户和相关文件，此脚本的性能最佳

#!/bin/bash
### Configuration Parameters Start ###
## The username that doesn't exist and you want to create.
user_name_prefix='testuser'

## The groups array that doesn't exist and you want to create and assign them to your user.
groups=(testadmin testsupport testengineering)

## SSH-key lenght
ssh_key_lenght='2048'
### Configuration Parameters End ###


for group in ${groups[@]} ;do
  # Set username containing the prefix and group name
  user="${user_name_prefix}_${group}"

  # create such user if not exist
  getent passwd ${user} &>/dev/null
  if [ "$?" -ne 0 ] ;then
    sudo useradd -m -s /bin/bash "${user}"

    echo -e "
Type password for: ${user}"
    sudo passwd ${user}
  fi

  # Create '.ssh' directory in user's home directory
  if ! [ -d /home/${user}/.ssh ] ;then
    sudo mkdir /home/${user}/.ssh
  fi

  # Generate ssh-key pair and move them to correspondig user's '.ssh/' dir.
  ssh_file_name="./${user}_ssh"
  (
  echo "${ssh_file_name}"
  echo ""
  echo "" 
  ) | ssh-keygen -t rsa -b ${ssh_key_lenght}

  sudo mv -i "${ssh_file_name}" "${ssh_file_name}.pub" /home/${user}/.ssh/
  sudo chown ${user}:${user} /home/${user}

  # Create the groups (if does not exist)
  getent group ${group} &>/dev/null
  if [ "$?" -ne 0 ] ;then
    sudo groupadd ${group}
  fi

  # Assign relevant group to the new user
  sudo usermod -aG ${group} ${user}
done

exit 0

经测试

GNU bash, version 5.0.17(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2019 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

PS。如果满足您的要求，请投票给我的答案并将其标记为正确答案。