Linux 下 SFTP 配置

1. 修改 /etc/ssh/sshd_config 文件向下代码
# override default of no subsystems
#Subsystem      sftp    /usr/libexec/openssh/sftp-server
 Subsystem      sftp    internal-sftp
#加入下代码
Match group apache  #把apache改成建用户的组
ChrootDirectory %h
X11Forwarding no
AllowTcpForwarding no
ForceCommand internal-sftp


2. 把下面脚本保存成可执行文件 
#!/bin/bash
#
# Last Modified: 2013/09/06 

userfile=/etc/passwd
groupfile=/etc/group
homedir=/home/wwwroot
loginshell=/sbin/nologin
groupname=apache #apache 同上面的组名字
username=$2

function check_root()
{
  if [ $EUID -ne 0 ]; then
    echo "This script must be run as root" 1>&2
    exit 1
  fi
}

function print_help(){
  #Print help messages then exit
  echo "Usage: $0 {create|disable|enable|passwd|sshkey|delete} {username}" >&2
  exit 1
}

function check_usergroup(){
  #Create usergroup if NOT exist
  cut -d : -f 1 $groupfile | grep -wq $groupname
  if [ $? -ne 0 ];then
    groupadd $groupname
  fi
}

function check_homedir(){
  #Create homedir if NOT exist
  if [ ! -d "$homedir" ];then
    mkdir $homedir
  fi
}

function check_username_exist(){
  #Check if user already exist
  cut -d : -f 1 $userfile | grep -wq $username
  if [ $? -eq 0 ];then
    echo "User $username ALREADY exist." && exit
  fi
}

function check_username_notexist() {
  #Check if user not exist
  cut -d : -f 1 $userfile | grep -wq $username
  if [ $? -ne 0 ];then
    echo "User $username NOT exist." && exit
  fi
}

function check_user_disabled(){
  #Check if user ALREADY disabled
  lockfile=$homedir/$username/sftpuser.locked
  if [ -a "$lockfile" ]; then
    echo "User $username ALREADY disabled." && exit
  fi
}

function update_sshkey(){
  #Get the sshkey
  echo -n "Input sshkey: "
  read sshkey
  #Check if sshkey is empty
  if [ -z "$sshkey" ];then
    echo "Empty sshkey." && exit
  fi
  #Check if sshkey not correct
  echo $sshkey | grep -Ewq '^ssh-rsa|^ssh-dss'
  if [ $? -ne 0 ];then
    echo "String \"ssh-rsa\" or \"ssh-dss\" NOT found." && exit
  fi
  mkdir $homedir/$username/.ssh
  chmod 700 $homedir/$username/.ssh
  echo "$sshkey" > $homedir/$username/.ssh/authorized_keys
  chmod 600 $homedir/$username/.ssh/authorized_keys
  chown -R $username:$groupname $homedir/$username/.ssh
}


if [ $# != 2 ];then
  if [ "$1" == 'passwd' ]; then
    if [ $# != 3 ]; then
      echo "Usage: $0 {passwd} {username} {password}" >&2
      exit 1
    fi
  else
    print_help
  fi
else
  if [ "$1" == 'passwd' ]; then
    echo "Usage: $0 {passwd} {username} {password}" >&2
    exit 1
  fi
fi

check_root
check_usergroup
check_homedir

case "$1" in
  'create')
    check_username_exist
    useradd -m -d "$homedir/$username" -g $groupname -s $loginshell -c "$username sftp" $username
    chmod 755 $homedir/$username
    chown root:root $homedir/$username
    #
    mkdir $homedir/$username/public_html
    chown -R $username:$groupname $homedir/$username/public_html
    chmod -R 750 $homedir/$username/public_html
    mkdir $homedir/$username/logs
    chown -R $username:$groupname $homedir/$username/logs
    chmod -R 750 $homedir/$username/logs
    if [ $? -eq 0 ]; then
      echo "User $username was created."
    fi
    ;;

  'disable')
    check_username_notexist
    passwd -l $username
    touch $homedir/$username/sftpuser.locked
    authfile=$homedir/$username/.ssh/authorized_keys
    if [ -a "$authfile" ]; then
      mv $authfile $authfile.disabled
    fi
    if [ $? -eq 0 ]; then
      echo "User $username was disabled."
    fi
    ;;

  'enable')
    check_username_notexist
    passwd -u $username
    rm -f $homedir/$username/sftpuser.locked
    authfile=$homedir/$username/.ssh/authorized_keys
    if [ -a "$authfile.disabled" ]; then
      mv $authfile.disabled $authfile
    fi
    if [ $? -eq 0 ]; then
      echo "User $username was enabled."
    fi
    ;;

  'delete')
    check_username_notexist
    echo -n "Delete all the data and account of user $username? [yes|no] "
    read yesorno
    if [ "$yesorno" == "yes" ];then
      userdel -rf $username
      if [ $? -eq 0 ]; then
        echo "User $username was deleted."
      fi
    fi
    ;;

  'passwd')
    check_username_notexist
    check_user_disabled
    #if [ "$3" -eq 0 ]; then
    #    echo "Plase input new password argment!" & exit
    #fi
    echo "$3" | passwd --stdin $username
    ;;

  'sshkey')
    check_username_notexist
    check_user_disabled
    update_sshkey
    if [ $? -eq 0 ]; then
      echo "The sshkey of user $username was updated."
    fi
    ;;

  *)
    print_help
    ;;
esac

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