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showcase.yaml
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---
AWSTemplateFormatVersion: '2010-09-09'
Description: 'AWS EC2 SSH access with IAM showcase'
Parameters:
VPC:
Type: 'AWS::EC2::VPC::Id'
Description: 'The VPC the EC2 instance is launched into.'
Subnet:
Type: 'AWS::EC2::Subnet::Id'
Description: 'The subnet the EC2 instance is launched into.'
AssumeRole:
Type: 'String'
Description: 'The role to assume to get the IAM users to provision into the instance'
Default: ''
Mappings:
RegionMap:
'ap-south-1':
AMI: 'ami-cacbbea5'
'eu-west-1':
AMI: 'ami-d41d58a7'
'ap-northeast-2':
AMI: 'ami-a04297ce'
'ap-northeast-1':
AMI: 'ami-1a15c77b'
'sa-east-1':
AMI: 'ami-b777e4db'
'ap-southeast-1':
AMI: 'ami-7243e611'
'ap-southeast-2':
AMI: 'ami-55d4e436'
'eu-central-1':
AMI: 'ami-0044b96f'
'us-east-1':
AMI: 'ami-c481fad3'
'us-east-2':
AMI: 'ami-71ca9114'
'us-west-1':
AMI: 'ami-de347abe'
'us-west-2':
AMI: 'ami-b04e92d0'
Conditions:
UseCrossAccountIAM: !Not [!Equals [!Ref AssumeRole, '']]
UseLocalIAM: !Equals [!Ref AssumeRole, '']
Resources:
SecurityGroup:
Type: 'AWS::EC2::SecurityGroup'
Properties:
GroupDescription: ssh
VpcId: !Ref VPC
SecurityGroupIngress:
- CidrIp: '0.0.0.0/0'
IpProtocol: tcp
FromPort: 22
ToPort: 22
InstanceProfile:
Type: 'AWS::IAM::InstanceProfile'
Properties:
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: /
CrossAccountRolePolicy:
Type: 'AWS::IAM::Policy'
Condition: UseCrossAccountIAM
Properties:
PolicyName: crossaccountiam
PolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Action: 'sts:AssumeRole'
Resource: !Ref AssumeRole
Roles:
- !Ref Role
LocalRolePolicy:
Type: 'AWS::IAM::Policy'
Condition: UseLocalIAM
Properties:
PolicyName: iam
PolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Action: 'iam:ListUsers'
Resource: '*'
- Effect: Allow
Action:
- 'iam:ListSSHPublicKeys'
- 'iam:GetSSHPublicKey'
Resource: !Sub 'arn:aws:iam::${AWS::AccountId}:user/*'
Roles:
- !Ref Role
Instance:
Type: AWS::EC2::Instance
Metadata:
'AWS::CloudFormation::Init':
config:
files:
'/opt/authorized_keys_command.sh':
!Sub: |
#!/bin/bash -e
if [ -z "$1" ]; then
exit 1
fi
# Assume a role before contacting AWS IAM to get users and keys.
# This can be used if you define your users in one AWS account, while the EC2
# instance you use this script runs in another.
AssumeRole="${AssumeRole}"
if [[ ! -z "${!AssumeRole}" ]]
then
STSCredentials=$(aws sts assume-role \
--role-arn "${!AssumeRole}" \
--role-session-name something \
--query '[Credentials.SessionToken,Credentials.AccessKeyId,Credentials.SecretAccessKey]' \
--output text)
AWS_ACCESS_KEY_ID=$(echo "${!STSCredentials}" | awk '{print $2}')
AWS_SECRET_ACCESS_KEY=$(echo "${!STSCredentials}" | awk '{print $3}')
AWS_SESSION_TOKEN=$(echo "${!STSCredentials}" | awk '{print $1}')
AWS_SECURITY_TOKEN=$(echo "${!STSCredentials}" | awk '{print $1}')
export AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY AWS_SESSION_TOKEN AWS_SECURITY_TOKEN
fi
SaveUserName="$1"
SaveUserName=${!SaveUserName//"+"/".plus."}
SaveUserName=${!SaveUserName//"="/".equal."}
SaveUserName=${!SaveUserName//","/".comma."}
SaveUserName=${!SaveUserName//"@"/".at."}
aws iam list-ssh-public-keys --user-name "$SaveUserName" --query "SSHPublicKeys[?Status == 'Active'].[SSHPublicKeyId]" --output text | while read KeyId; do
aws iam get-ssh-public-key --user-name "$SaveUserName" --ssh-public-key-id "$KeyId" --encoding SSH --query "SSHPublicKey.SSHPublicKeyBody" --output text
done
mode: '000755'
owner: root
group: root
'/opt/import_users.sh':
!Sub: |
#!/bin/bash
# Assume a role before contacting AWS IAM to get users and keys.
# This can be used if you define your users in one AWS account, while the EC2
# instance you use this script runs in another.
AssumeRole="${AssumeRole}"
if [[ ! -z "${!AssumeRole}" ]]
then
STSCredentials=$(aws sts assume-role \
--role-arn "${!AssumeRole}" \
--role-session-name something \
--query '[Credentials.SessionToken,Credentials.AccessKeyId,Credentials.SecretAccessKey]' \
--output text)
AWS_ACCESS_KEY_ID=$(echo "${!STSCredentials}" | awk '{print $2}')
AWS_SECRET_ACCESS_KEY=$(echo "${!STSCredentials}" | awk '{print $3}')
AWS_SESSION_TOKEN=$(echo "${!STSCredentials}" | awk '{print $1}')
AWS_SECURITY_TOKEN=$(echo "${!STSCredentials}" | awk '{print $1}')
export AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY AWS_SESSION_TOKEN AWS_SECURITY_TOKEN
fi
# Specify an IAM group for users who should be given sudo privileges, or leave
# empty to not change sudo access, or give it the value '##ALL##' to have all
# users be given sudo rights.
SudoersGroup=""
[[ -z "${!SudoersGroup}" ]] || [[ "${!SudoersGroup}" == "##ALL##" ]] || Sudoers=$(
aws iam get-group --group-name "${!SudoersGroup}" --query "Users[].[UserName]" --output text
);
aws iam list-users --query "Users[].[UserName]" --output text | while read User; do
SaveUserName="$User"
SaveUserName=${!SaveUserName//"+"/".plus."}
SaveUserName=${!SaveUserName//"="/".equal."}
SaveUserName=${!SaveUserName//","/".comma."}
SaveUserName=${!SaveUserName//"@"/".at."}
if ! grep "^$SaveUserName:" /etc/passwd > /dev/null; then
/usr/sbin/useradd --create-home --shell /bin/bash "$SaveUserName"
fi
if [[ ! -z "${!SudoersGroup}" ]]; then
# sudo will read each file in /etc/sudoers.d, skipping file names that end
# in ‘~’ or contain a ‘.’ character to avoid causing problems with package
# manager or editor temporary/backup files.
SaveUserFileName=$(echo "$SaveUserName" | tr "." " ")
SaveUserSudoFilePath="/etc/sudoers.d/$SaveUserFileName"
if [[ "${!SudoersGroup}" == "##ALL##" ]] || echo "$Sudoers" | grep "^$User\$" > /dev/null; then
echo "$SaveUserName ALL=(ALL) NOPASSWD:ALL" > "$SaveUserSudoFilePath"
else
[[ ! -f "$SaveUserSudoFilePath" ]] || rm "$SaveUserSudoFilePath"
fi
fi
done
mode: '000755'
owner: root
group: root
'/etc/cron.d/import_users':
content: |
*/10 * * * * root /opt/import_users.sh
mode: '000644'
owner: root
group: root
'/etc/cfn/cfn-hup.conf':
content: !Sub |
[main]
stack=${AWS::StackId}
region=${AWS::Region}
interval=1
mode: '000400'
owner: root
group: root
'/etc/cfn/hooks.d/cfn-auto-reloader.conf':
content: !Sub |
[cfn-auto-reloader-hook]
triggers=post.update
path=Resources.Instance.Metadata.AWS::CloudFormation::Init
action=/opt/aws/bin/cfn-init --verbose --stack=${AWS::StackName} --region=${AWS::Region} --resource=Instance
runas=root
commands:
a_configure_sshd_command:
command: "sed -i 's:#AuthorizedKeysCommand none:AuthorizedKeysCommand /opt/authorized_keys_command.sh:g' /etc/ssh/sshd_config"
b_configure_sshd_commanduser:
command: "sed -i 's:#AuthorizedKeysCommandUser nobody:AuthorizedKeysCommandUser nobody:g' /etc/ssh/sshd_config"
c_import_users:
command: './import_users.sh'
cwd: '/opt'
services:
sysvinit:
'cfn-hup':
enabled: true
ensureRunning: true
files:
- '/etc/cfn/cfn-hup.conf'
- '/etc/cfn/hooks.d/cfn-auto-reloader.conf'
sshd:
enabled: true
ensureRunning: true
commands:
- 'a_configure_sshd_command'
- 'b_configure_sshd_commanduser'
Properties:
ImageId: !FindInMap [RegionMap, !Ref 'AWS::Region', AMI]
IamInstanceProfile: !Ref InstanceProfile
InstanceType: 't2.micro'
UserData:
'Fn::Base64': !Sub |
#!/bin/bash -x
/opt/aws/bin/cfn-init --verbose --stack=${AWS::StackName} --region=${AWS::Region} --resource=Instance
/opt/aws/bin/cfn-signal --exit-code=$? --stack=${AWS::StackName} --region=${AWS::Region} --resource=Instance
NetworkInterfaces:
- AssociatePublicIpAddress: true
DeleteOnTermination: true
SubnetId: !Ref Subnet
DeviceIndex: 0
GroupSet:
- !Ref SecurityGroup
Tags:
- Key: Name
Value: 'AWS EC2 SSH access with IAM showcase'
CreationPolicy:
ResourceSignal:
Count: 1
Timeout: PT15M
Outputs:
PublicName:
Description: 'The public name of the EC2 instance.'
Value: !GetAtt 'Instance.PublicDnsName'