Comment créer un groupe de sécurité avec une adresse IP dynamique sur le service Web Amazon

1. Créez un groupe de sécurité avec l'accès à l'ingression du port 22 de votre adresse IP actuelle. LI>
2. Ajoutez une étiquette au groupe de sécurité avec la clé ssh-from-my-ip code> et la valeur true code> li>
3. Chaque fois que votre IP change d'exécution de ce script (ou exécutez-le périodiquement via cron code>) li>

   #! /bin/bash
   
   # This script makes it easier to maintain security groups that allow SSH access
   # from a computer with a dynamic IP, such as a computer on a home network or ISP.
   #
   # Using the script will allow you to SSH to an EC2 without having to allow
   # access to the whole world (0.0.0.0/0). If you run this script whenever your IP
   # changes then the security groups in your account specified by your AWS profile
   # will be updated.
   #
   # The script will find any security groups for your current profile that are
   # tagged with a Tag with a Key of "ssh-from-my-ip" and a case insensitive value
   # of "true" or "yes".
   #
   # For each security group found it will revoke any existing tcp ingress on
   # port 22 and authorize ingress on port 22 for your current IP.
   #
   # Dependencies - AWS CLI and jq
   
   
   # need my current ip
   MY_IP=$(curl --silent https://checkip.amazonaws.com)
   echo "Your IP is ${MY_IP}"
   
   # need security group id(s) and existing CIDR for the SG
   pairs=$(aws ec2 describe-security-groups | aws ec2 describe-security-groups | jq -c '.SecurityGroups[]? | select( (.Tags[]? | select(.Key == "ssh-from-my-ip") | .Value | test("true|yes"; "i"))) | if .IpPermissions | length == 0 then {sg: .GroupId, cidr: null } else {sg: .GroupId, cidr: .IpPermissions[].IpRanges[].CidrIp} end')
   
   for p in $pairs
   do
     SG=$(echo "$p" | jq -r '.sg')
     OLD_CIDR=$(echo "$p" | jq -r '.cidr')
   
     echo "Updating security group ${SG}"
     if [[ $OLD_CIDR != 'null' ]]
     then
       echo "Revoking ingress permission for ${OLD_CIDR} in security group ${SG}"
       # remove the existing ingress permission
       aws ec2 revoke-security-group-ingress \
           --group-id "${SG}" \
           --protocol tcp \
           --port 22 \
           --cidr "${OLD_CIDR}"
     fi
   
     # authorize my new IP CIDR
     NEW_CIDR="${MY_IP}"/32
     echo "Authorizing ingress permission for ${NEW_CIDR} in security group ${SG}"
     aws ec2 authorize-security-group-ingress --group-id "${SG}" --ip-permissions '[{"IpProtocol": "tcp", "FromPort": 22, "ToPort": 22, "IpRanges": [{"CidrIp": "'"${NEW_CIDR}"'", "Description": "Rule0"}]}]'
   done
   

#!/bin/bash

# User specific data:
SECURITY_GROUP_NAME="" # Setup here your group name
REGION=${1:-"us-east-1"} # Change default region if needed


USER=`aws iam get-user --query "User.UserName" | tr -d '"'`
RULE_DESCRIPTION='DynamicIP'$USER
echo 'User: '$RULE_DESCRIPTION', Region: '$REGION', Security group: '$SECURITY_GROUP_NAME

checkip () {
    OLD_CIDR_IP=`aws ec2 describe-security-groups --region $REGION --query "SecurityGroups[?GroupName=='$SECURITY_GROUP_NAME'].IpPermissions[*].IpRanges[?Description=='$RULE_DESCRIPTION'].CidrIp" --output text`
    NEW_IP=`curl -s http://checkip.amazonaws.com`
    NEW_CIDR_IP=$NEW_IP'/32'

    if [[ $OLD_CIDR_IP != "" ]] && [[ $OLD_CIDR_IP != $NEW_CIDR_IP ]]; then
        echo "Revoking $OLD_CIDR_IP"
        aws ec2 revoke-security-group-ingress --region $REGION --group-name $SECURITY_GROUP_NAME --protocol tcp --port 22 --cidr $OLD_CIDR_IP --output text >> /dev/null
    fi

    if [[ $NEW_IP != "" ]] && [[ $OLD_CIDR_IP != $NEW_CIDR_IP ]]; then
        echo "Setting up new ip $NEW_IP"
        aws ec2 authorize-security-group-ingress --region $REGION --group-name $SECURITY_GROUP_NAME --ip-permissions '[{"IpProtocol": "tcp", "FromPort": 22, "ToPort": 22, "IpRanges": [{"CidrIp": "'$NEW_CIDR_IP'", "Description": "'$RULE_DESCRIPTION'"}]}]'
    fi

    sleep 30
    checkip
}

checkip