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EC2-and-SSH.json
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EC2-and-SSH.json
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{
"AWSTemplateFormatVersion": "2010-09-09",
"Description": "EC2 and SSH showcase: https://github.com/widdix/aws-ec2-ssh",
"Parameters": {
"VPC": {
"Description": "The VPC the EC2 instance is launched into.",
"Type": "AWS::EC2::VPC::Id"
},
"Subnet": {
"Description": "The subnet the EC2 instance is launched into.",
"Type": "AWS::EC2::Subnet::Id"
}
},
"Mappings": {
"RegionMap": {
"eu-west-1": {"AMI": "ami-31328842"},
"ap-southeast-1": {"AMI": "ami-e90dc68a"},
"ap-southeast-2": {"AMI": "ami-f2210191"},
"eu-central-1": {"AMI": "ami-e2df388d"},
"ap-northeast-2": {"AMI": "ami-6598510b"},
"ap-northeast-1": {"AMI": "ami-f80e0596"},
"us-east-1": {"AMI": "ami-08111162"},
"sa-east-1": {"AMI": "ami-1e159872"},
"us-west-1": {"AMI": "ami-1b0f7d7b"},
"us-west-2": {"AMI": "ami-c229c0a2"}
}
},
"Resources": {
"SecurityGroup": {
"Type": "AWS::EC2::SecurityGroup",
"Properties": {
"GroupDescription": "ssh",
"VpcId": {"Ref": "VPC"},
"SecurityGroupIngress": [{
"CidrIp": "0.0.0.0/0",
"FromPort": 22,
"IpProtocol": "tcp",
"ToPort": 22
}]
}
},
"InstanceProfile": {
"Type": "AWS::IAM::InstanceProfile",
"Properties": {
"Path": "/",
"Roles": [{"Ref": "Role"}]
}
},
"Role": {
"Type": "AWS::IAM::Role",
"Properties": {
"AssumeRolePolicyDocument": {
"Version": "2012-10-17",
"Statement": [{
"Effect": "Allow",
"Principal": {
"Service": ["ec2.amazonaws.com"]
},
"Action": ["sts:AssumeRole"]
}]
},
"Path": "/",
"Policies": [{
"PolicyName": "iam",
"PolicyDocument": {
"Version": "2012-10-17",
"Statement": [{
"Effect": "Allow",
"Action": [
"iam:ListUsers"
],
"Resource": [
"*"
]
}, {
"Effect": "Allow",
"Action": [
"iam:ListSSHPublicKeys",
"iam:GetSSHPublicKey"
],
"Resource": [
{"Fn::Join": ["", ["arn:aws:iam::", {"Ref": "AWS::AccountId"},":user/*"]]}
]
}]
}
}]
}
},
"Instance": {
"Type": "AWS::EC2::Instance",
"Metadata": {
"AWS::CloudFormation::Init": {
"config": {
"files": {
"/opt/authorized_keys_command.sh": {
"content": {"Fn::Join": ["", [
"#!/bin/bash -e", "\n",
"if [ -z \"$1\" ]; then", "\n",
" exit 1", "\n",
"fi", "\n",
"aws iam list-ssh-public-keys --user-name \"$1\" --query \"SSHPublicKeys[?Status == 'Active'].[SSHPublicKeyId]\" --output text | while read KeyId; do", "\n",
" aws iam get-ssh-public-key --user-name \"$1\" --ssh-public-key-id \"$KeyId\" --encoding SSH --query \"SSHPublicKey.SSHPublicKeyBody\" --output text", "\n",
"done", "\n"
]]},
"mode": "000755",
"owner": "root",
"group": "root"
},
"/opt/import_users.sh": {
"content": {"Fn::Join": ["", [
"#!/bin/bash", "\n",
"aws iam list-users --query \"Users[].[UserName]\" --output text | while read User; do", "\n",
" if id -u \"$User\" >/dev/null 2>&1; then", "\n",
" echo \"$User exists\"", "\n",
" else", "\n",
" /usr/sbin/adduser \"$User\"", "\n",
" echo \"$User ALL=(ALL) NOPASSWD:ALL\" > \"/etc/sudoers.d/$User\"", "\n",
" fi", "\n",
"done", "\n"
]]},
"mode": "000755",
"owner": "root",
"group": "root"
},
"/etc/cron.d/import_users": {
"content": {"Fn::Join": ["", [
"*/10 * * * * root /opt/import_users.sh", "\n"
]]},
"mode": "000644",
"owner": "root",
"group": "root"
},
"/etc/cfn/cfn-hup.conf": {
"content": {"Fn::Join": ["", [
"[main]", "\n",
"stack=", {"Ref": "AWS::StackId"}, "\n",
"region=", {"Ref": "AWS::Region"}, "\n"
]]},
"mode": "000400",
"owner": "root",
"group": "root"
},
"/etc/cfn/hooks.d/cfn-auto-reloader.conf": {
"content": {"Fn::Join": ["", [
"[cfn-auto-reloader-hook]", "\n",
"triggers=post.update", "\n",
"path=Resources.Instance.Metadata.AWS::CloudFormation::Init", "\n",
"action=/opt/aws/bin/cfn-init --verbose --stack=", {"Ref": "AWS::StackName"}, " --region=", {"Ref": "AWS::Region"}, " --resource=Instance", "\n",
"runas=root", "\n"
]]}
}
},
"commands": {
"a_configure_sshd_command": {
"command": "sed -i 's:#AuthorizedKeysCommand none:AuthorizedKeysCommand /opt/authorized_keys_command.sh:g' /etc/ssh/sshd_config"
},
"b_configure_sshd_commanduser": {
"command": "sed -i 's:#AuthorizedKeysCommandUser nobody:AuthorizedKeysCommandUser nobody:g' /etc/ssh/sshd_config"
},
"c_import_users": {
"command": "./import_users.sh",
"cwd": "/opt"
}
},
"services": {
"sysvinit": {
"cfn-hup": {
"enabled": "true",
"ensureRunning": "true",
"files": ["/etc/cfn/cfn-hup.conf", "/etc/cfn/hooks.d/cfn-auto-reloader.conf"]
},
"sshd": {
"enabled": "true",
"ensureRunning": "true",
"commands": ["a_configure_sshd_command", "b_configure_sshd_commanduser"]
}
}
}
}
}
},
"Properties": {
"ImageId": {"Fn::FindInMap": ["RegionMap", {"Ref": "AWS::Region"}, "AMI"]},
"IamInstanceProfile": {"Ref": "InstanceProfile"},
"InstanceType": "t2.micro",
"SecurityGroupIds": [{"Ref": "SecurityGroup"}],
"SubnetId": {"Ref": "Subnet"},
"UserData": {"Fn::Base64": {"Fn::Join": ["", [
"#!/bin/bash -x", "\n",
"/opt/aws/bin/cfn-init --verbose --stack=", {"Ref": "AWS::StackName"}, " --region=", {"Ref": "AWS::Region"}, " --resource=Instance", "\n",
"/opt/aws/bin/cfn-signal --exit-code=$? --stack=", {"Ref": "AWS::StackName"}, " --region=", {"Ref": "AWS::Region"}, " --resource=Instance", "\n"
]]}},
"Tags": [{
"Key": "Name",
"Value": "ec2-ssh-showcase"
}]
},
"CreationPolicy": {
"ResourceSignal": {
"Count": 1,
"Timeout": "PT15M"
}
}
}
},
"Outputs": {
"PublicName": {
"Description": "The public name of the EC2 instance.",
"Value": {"Fn::GetAtt": ["Instance", "PublicDnsName"]}
}
}
}