sudo nano /usr/local/bin/ssh-login-notify.sh

#!/bin/bash

USER_NAME=$PAM_USER
HOST_NAME=$(hostname)
TIME_NOW=$(TZ=Asia/Shanghai date "+%Y-%m-%d %H:%M:%S %Z")
GOTIFY_URL="http://127.0.0.1:8118"  # <- 更改此处的地址和token
GOTIFY_TOKEN="<GOTIFY_TOKEN>"

# 获取IP地址 - 修复SFTP连接显示问题
if [ -n "$SSH_CONNECTION" ]; then
  IP_ADDRESS=$(echo $SSH_CONNECTION | awk '{print $1}')
else
  # 回退到who命令，但过滤掉无效的输出
  IP_ADDRESS=$(who | awk '{print $5}' | grep -Eo '([0-9]{1,3}\.){3}[0-9]{1,3}' | head -n 1)
fi

[ -z "$IP_ADDRESS" ] && IP_ADDRESS="unknown"

# 获取服务器的公网IP地址
get_server_public_ip() {
  # 尝试通过不同方式获取公网IP
  local public_ip=""
  
  # 方法1: 使用dig查询DNS
  public_ip=$(dig +short myip.opendns.com @resolver1.opendns.com 2>/dev/null)
  
  # 方法2: 使用curl查询外部服务
  if [ -z "$public_ip" ]; then
    public_ip=$(curl -s http://ifconfig.me 2>/dev/null)
  fi
  
  # 方法3: 使用hostname命令
  if [ -z "$public_ip" ]; then
    public_ip=$(hostname -I | awk '{print $1}' 2>/dev/null)
  fi
  
  echo "$public_ip"
}

# 检查是否为局域网、回环地址或服务器自身公网IP
is_local_or_self_ip() {
  local ip=$1
  # 回环地址
  if [[ $ip == "127.0.0.1" || $ip == "::1" || $ip == "localhost" ]]; then
    return 0
  fi
  
  # 私有IP地址范围
  if [[ $ip =~ ^10\. ]] || \
     [[ $ip =~ ^172\.(1[6-9]|2[0-9]|3[0-1])\. ]] || \
     [[ $ip =~ ^192\.168\. ]] || \
     [[ $ip =~ ^169\.254\. ]]; then
    return 0
  fi
  
  # 获取服务器公网IP
  local server_public_ip=$(get_server_public_ip)
  
  # 检查是否为服务器自身公网IP
  if [[ "$ip" == "$server_public_ip" ]]; then
    return 0
  fi
  
  # 不是本地IP或自身公网IP
  return 1
}

# 如果是局域网、回环地址或服务器自身公网IP，直接退出
if is_local_or_self_ip "$IP_ADDRESS"; then
  exit 0
fi

# 如果是会话关闭，退出
if [[ $PAM_TYPE == 'close_session' ]]; then
  exit 0
fi

# 获取地理位置信息（可选）
GEO_INFO=""
if [[ "$IP_ADDRESS" != "unknown" && "$IP_ADDRESS" != "127.0.0.1" && "$IP_ADDRESS" != ::1 ]]; then
  GEO_JSON=$(curl -s "https://ipinfo.io/$IP_ADDRESS/json")
  CITY=$(echo "$GEO_JSON" | jq -r '.city')
  REGION=$(echo "$GEO_JSON" | jq -r '.region')
  COUNTRY=$(echo "$GEO_JSON" | jq -r '.country')
  ORG=$(echo "$GEO_JSON" | jq -r '.org')
  
  # 将国家代码转换为国旗表情符号的函数
  flag() {
    local code="${1^^}"
    local first=$(( $(printf "%d" "'${code:0:1}") - 65 + 0x1F1E6 ))
    local second=$(( $(printf "%d" "'${code:1:1}") - 65 + 0x1F1E6 ))
    printf '%b' "$(printf '\\U%08X\\U%08X' "$first" "$second")"
  }
  
  # 使用Unicode编码的表情符号
  EARTH_ICON=$(printf '\U1F30D')
  GEO_INFO="$EARTH_ICON 位置: $CITY, $REGION, $COUNTRY $(flag $COUNTRY)"
fi

# 构建消息内容
TITLE="SSH登录提醒 - $HOST_NAME"
MESSAGE="用户 $USER_NAME 从 $IP_ADDRESS 登录到 $HOST_NAME
时间: $TIME_NOW
$GEO_INFO"

# 发送到Gotify
if [ -n "$SSH_CONNECTION" ] || [ -n "$SFTP_CONNECTION" ]; then
  curl -s -o /dev/null \
    -X POST \
    -F "title=${TITLE}" \
    -F "message=${MESSAGE}" \
    -F "priority=5" \
    "${GOTIFY_URL}/message?token=${GOTIFY_TOKEN}"
fi

sudo chmod +x /usr/local/bin/ssh-login-notify.sh

sudo apt update && sudo apt install jq dnsutils curl -y

sudo nano /etc/pam.d/sshd

session optional pam_exec.so /usr/local/bin/ssh-login-notify.sh

sudo systemctl restart sshd