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template.yaml
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---
# Copyright 2018 widdix GmbH
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
AWSTemplateFormatVersion: '2010-09-09'
Description: 'Security: Antivirus for Amazon S3, a cloudonaut.io template'
Metadata:
'AWS::CloudFormation::Interface':
ParameterGroups:
- Label:
default: 'Parent Stacks'
Parameters:
- ParentVPCStack
- ParentSSHBastionStack
- Label:
default: 'Scan Parameters'
Parameters:
- DeleteInfectedFiles
- ReportCleanFiles
- TagFiles
- TagKey
- S3BucketRestriction
- S3ObjectRestriction
- Label:
default: 'Auto Scaling Group Parameters'
Parameters:
- AutoScalingMinSize
- AutoScalingMaxSize
- Label:
default: 'EC2 Parameters'
Parameters:
- KeyName
- IAMUserSSHAccess
- SystemsManagerAccess
- InstanceType
- SpotPrice
- LogsRetentionInDays
- VolumeSize
- SwapSize
Parameters:
ParentVPCStack:
Description: 'Stack name of parent VPC stack based on vpc/vpc-*azs.yaml template.'
Type: String
ParentSSHBastionStack:
Description: 'Optional stack name of parent SSH bastion host/instance stack based on vpc/vpc-ssh-bastion.yaml template.'
Type: String
Default: ''
S3BucketRestriction:
Description: 'Restrict access to specific S3 buckets (e.g. arn:aws:s3:::s3-virusscan-a,arn:aws:s3:::s3-virusscan-b or * to allow access to all S3 buckets).'
Type: CommaDelimitedList
Default: '*'
S3ObjectRestriction:
Description: 'Restrict access to specific S3 objects (e.g. arn:aws:s3:::s3-virusscan-a/*,arn:aws:s3:::s3-virusscan-b/* or * to allow access to all S3 objects).'
Type: CommaDelimitedList
Default: '*'
DeleteInfectedFiles:
Description: 'Automatically delete infected files'
Type: String
Default: true
AllowedValues:
- true
- false
ReportCleanFiles:
Description: 'Report successful scan of clean, as well as infected files to the SNS topic'
Type: String
Default: false
AllowedValues:
- true
- false
TagFiles:
Description: 'Tag S3 object upon successful scan accordingly with values of "clean" or "infected" (infected only works if DeleteInfectedFiles != true) using key specified by TagKey.'
Type: String
Default: false
AllowedValues:
- true
- false
TagKey:
Description: 'S3 object tag key used to specify values of "clean" or "infected".'
Type: String
Default: 'clamav-status'
AutoScalingMinSize:
Description: 'Min Size for Auto Scaling'
Type: Number
Default: 1
ConstraintDescription: 'Must be >= 0'
MinValue: 0
AutoScalingMaxSize:
Description: 'Max Size for Auto Scaling'
Type: Number
Default: 1
ConstraintDescription: 'Must be >= 1'
MinValue: 1
KeyName:
Description: 'Optional provide an EC2 key pair if you want to login via SSH'
Type: String
Default: ''
IAMUserSSHAccess:
Description: 'Synchronize public keys of IAM users to enable personalized SSH access (Doc: https://cloudonaut.io/manage-aws-ec2-ssh-access-with-iam/).'
Type: String
Default: false
AllowedValues:
- true
- false
SystemsManagerAccess:
Description: 'Enable AWS Systems Manager agent and authorization.'
Type: String
Default: true
AllowedValues:
- true
- false
InstanceType:
Description: 'Specifies the instance type of the EC2 instance'
Type: String
Default: 't2.small'
SpotPrice:
Description: 'Optional spot price (leave empty to start on-demand instances).'
Type: String
AllowedPattern: '[0-9\.]*'
ConstraintDescription: 'Must be a positive number'
Default: ''
LogsRetentionInDays:
Description: 'Specifies the number of days you want to retain log events.'
Type: Number
Default: 14
AllowedValues: [1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1827, 3653]
VolumeSize:
Description: 'The size of the volume, in gibibytes (GiBs). You can only scan files that are smaller than half of this value.'
Type: Number
Default: 16
ConstraintDescription: 'Must be in the range [8-1024]'
MinValue: 8
MaxValue: 1024
SwapSize:
Description: 'The size of the SWAP area (neeeds to fit into VolumeSize).'
Type: Number
Default: 2
ConstraintDescription: 'Must be in the range [0-8]'
MinValue: 0
MaxValue: 8
Conditions:
HasSSHBastionSecurityGroup: !Not [!Equals [!Ref ParentSSHBastionStack, '']]
HasKeyName: !Not [!Equals [!Ref KeyName, '']]
HasIAMUserSSHAccess: !Equals [!Ref IAMUserSSHAccess, 'true']
HasSystemsManagerAccess: !Equals [!Ref SystemsManagerAccess, 'true']
HasNotSSHBastionSecurityGroup: !Equals [!Ref ParentSSHBastionStack, '']
HasDeleteInfectedFiles: !Equals [!Ref DeleteInfectedFiles, 'true']
HasTagFiles: !Equals [!Ref TagFiles, 'true']
HasSpotPrice: !Not [!Equals [!Ref SpotPrice, '']]
HasSwapSize: !Not [!Equals [!Ref SwapSize, '0']]
Mappings:
RegionMap:
'af-south-1':
AMI: 'ami-0cec12e29ebe3f0d5'
'eu-north-1':
AMI: 'ami-0653812935d0743fe'
'ap-south-1':
AMI: 'ami-0e306788ff2473ccb'
'eu-west-3':
AMI: 'ami-0de12f76efe134f2f'
'eu-west-2':
AMI: 'ami-0a669382ea0feb73a'
'eu-south-1':
AMI: 'ami-0759301b88845d121'
'eu-west-1':
AMI: 'ami-0bb3fad3c0286ebd5'
'ap-northeast-2':
AMI: 'ami-03b42693dc6a7dc35'
'me-south-1':
AMI: 'ami-08155c9ee8b845e35'
'ap-northeast-1':
AMI: 'ami-0ce107ae7af2e92b5'
'sa-east-1':
AMI: 'ami-02898a1921d38a50b'
'ca-central-1':
AMI: 'ami-0c2f25c1f66a1ff4d'
'ap-east-1':
AMI: 'ami-814d0ff0'
'ap-southeast-1':
AMI: 'ami-015a6758451df3cb9'
'ap-southeast-2':
AMI: 'ami-0f96495a064477ffb'
'eu-central-1':
AMI: 'ami-00a205cb8e06c3c4e'
'us-east-1':
AMI: 'ami-0947d2ba12ee1ff75'
'us-east-2':
AMI: 'ami-03657b56516ab7912'
'us-west-1':
AMI: 'ami-0e4035ae3f70c400f'
'us-west-2':
AMI: 'ami-0528a5175983e7f28'
Resources:
FindingsTopic:
Type: 'AWS::SNS::Topic'
Properties: {}
ScanQueue:
Type: 'AWS::SQS::Queue'
Properties:
VisibilityTimeout: 300
RedrivePolicy:
deadLetterTargetArn: !GetAtt 'ScanQueueDLQ.Arn'
maxReceiveCount: 3
ScanQueueFullAlarm:
Type: 'AWS::CloudWatch::Alarm'
Properties:
AlarmActions:
- !Ref ScanScaleUp
ComparisonOperator: GreaterThanThreshold
Dimensions:
- Name: QueueName
Value: !GetAtt 'ScanQueue.QueueName'
EvaluationPeriods: 1
MetricName: ApproximateNumberOfMessagesVisible
Namespace: 'AWS/SQS'
Period: 300
Statistic: Maximum
Threshold: 0
TreatMissingData: notBreaching
ScanQueueEmptyAlarm:
Type: 'AWS::CloudWatch::Alarm'
Properties:
AlarmActions:
- !Ref ScanScaleDown
ComparisonOperator: LessThanOrEqualToThreshold
Dimensions:
- Name: QueueName
Value: !GetAtt 'ScanQueue.QueueName'
EvaluationPeriods: 1
MetricName: ApproximateNumberOfMessagesVisible
Namespace: 'AWS/SQS'
Period: 300
Statistic: Maximum
Threshold: 0
TreatMissingData: notBreaching
ScanQueuePolicy:
Type: 'AWS::SQS::QueuePolicy'
Properties:
PolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Principal:
Service: 's3.amazonaws.com'
Action: 'SQS:SendMessage'
Resource: !GetAtt 'ScanQueue.Arn'
Condition:
StringEquals:
'aws:SourceAccount': !Ref 'AWS::AccountId'
Queues:
- !Ref ScanQueue
ScanQueueDLQ:
Type: 'AWS::SQS::Queue'
Properties:
MessageRetentionPeriod: 1209600
ScanQueueDLQAlarm:
Type: 'AWS::CloudWatch::Alarm'
Properties:
AlarmDescription: 'Alarm if dead letter queue has messages'
Namespace: 'AWS/SQS'
MetricName: ApproximateNumberOfMessagesVisible
Dimensions:
- Name: QueueName
Value: !GetAtt 'ScanQueueDLQ.QueueName'
Statistic: Sum
Period: 60
EvaluationPeriods: 1
Threshold: 1
ComparisonOperator: GreaterThanOrEqualToThreshold
AlarmActions:
- !Ref FindingsTopic
TreatMissingData: notBreaching
ScanQueueOldMessagesAlarm:
Type: 'AWS::CloudWatch::Alarm'
Properties:
AlarmDescription: 'Alarm if scan queue contains a message older than 1 hour'
Namespace: 'AWS/SQS'
MetricName: ApproximateAgeOfOldestMessage
Dimensions:
- Name: QueueName
Value: !GetAtt 'ScanQueue.QueueName'
Statistic: Maximum
Period: 60
EvaluationPeriods: 1
Threshold: 3600 # 1 hour
ComparisonOperator: GreaterThanOrEqualToThreshold
AlarmActions:
- !Ref FindingsTopic
TreatMissingData: notBreaching
ScanAutoScalingGroup:
Type: 'AWS::AutoScaling::AutoScalingGroup'
Properties:
LaunchConfigurationName: !Ref ScanLaunchConfiguration
MaxSize: !Ref AutoScalingMaxSize
MinSize: !Ref AutoScalingMinSize
VPCZoneIdentifier: !Split [',', {'Fn::ImportValue': !Sub '${ParentVPCStack}-SubnetsPublic'}]
Tags:
- Key: Name
Value: !Ref 'AWS::StackName'
PropagateAtLaunch: true
CreationPolicy:
ResourceSignal:
Timeout: PT10M
UpdatePolicy:
AutoScalingRollingUpdate:
PauseTime: PT10M
WaitOnResourceSignals: true
ScanScaleUp:
Type: 'AWS::AutoScaling::ScalingPolicy'
Properties:
AdjustmentType: ChangeInCapacity
AutoScalingGroupName: !Ref ScanAutoScalingGroup
EstimatedInstanceWarmup: 300
MetricAggregationType: Maximum
PolicyType: StepScaling
StepAdjustments:
- MetricIntervalLowerBound: 0
MetricIntervalUpperBound: 25
ScalingAdjustment: 1
- MetricIntervalLowerBound: 25
MetricIntervalUpperBound: 100
ScalingAdjustment: 2
- MetricIntervalLowerBound: 100
MetricIntervalUpperBound: 400
ScalingAdjustment: 4
- MetricIntervalLowerBound: 400
MetricIntervalUpperBound: 1600
ScalingAdjustment: 8
- MetricIntervalLowerBound: 1600
MetricIntervalUpperBound: 6400
ScalingAdjustment: 16
- MetricIntervalLowerBound: 6400
MetricIntervalUpperBound: 25600
ScalingAdjustment: 32
- MetricIntervalLowerBound: 25600
ScalingAdjustment: 64
ScanScaleDown:
Type: 'AWS::AutoScaling::ScalingPolicy'
Properties:
AdjustmentType: PercentChangeInCapacity
AutoScalingGroupName: !Ref ScanAutoScalingGroup
Cooldown: '300'
MinAdjustmentMagnitude: 1
PolicyType: SimpleScaling
ScalingAdjustment: -25
ScanInstanceProfile:
Type: 'AWS::IAM::InstanceProfile'
Properties:
Roles:
- !Ref ScanIAMRole
ScanIAMRole:
Type: 'AWS::IAM::Role'
Properties:
AssumeRolePolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Principal:
Service: 'ec2.amazonaws.com'
Action: sts:AssumeRole
ManagedPolicyArns: !If [HasSystemsManagerAccess, ['arn:aws:iam::aws:policy/service-role/AmazonEC2RoleforSSM'], []]
Path: /
Policies:
- PolicyName: s3read
PolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Action: 's3:GetObject*'
Resource: !Ref S3ObjectRestriction
- Effect: Allow
Action: 's3:ListBucket*'
Resource: !Ref S3BucketRestriction
- Effect: Allow
Action: 'kms:Decrypt'
Resource: '*'
- PolicyName: sqs
PolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Action:
- 'sqs:DeleteMessage'
- 'sqs:ReceiveMessage'
Resource: !GetAtt 'ScanQueue.Arn'
- PolicyName: sns
PolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Action: 'sns:Publish'
Resource: !Ref FindingsTopic
- PolicyName: cloudwatch
PolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Action: 'cloudwatch:PutMetricData'
Resource: '*'
Condition:
StringEquals:
'cloudwatch:namespace': !Ref 'AWS::StackName'
- Effect: Allow
Action: 'ec2:DescribeTags'
Resource: '*'
- Effect: Allow
Action:
- 'logs:CreateLogGroup'
- 'logs:CreateLogStream'
- 'logs:PutLogEvents'
- 'logs:DescribeLogStreams'
- 'logs:DescribeLogGroups'
Resource: !GetAtt 'Logs.Arn'
DeletePolicy:
Type: 'AWS::IAM::Policy'
Condition: HasDeleteInfectedFiles
Properties:
PolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Action: 's3:DeleteObject*'
Resource: !Ref S3ObjectRestriction
PolicyName: s3delete
Roles:
- !Ref ScanIAMRole
TagObjectPolicy:
Type: 'AWS::IAM::Policy'
Condition: HasTagFiles
Properties:
PolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Action:
- 's3:PutObjectTagging'
- 's3:PutObjectVersionTagging'
Resource: !Ref S3ObjectRestriction
Condition:
'ForAllValues:StringLike':
's3:RequestObjectTagKeys': !Ref TagKey
PolicyName: s3objecttag
Roles:
- !Ref ScanIAMRole
ScanIAMPolicySSHAccess:
Type: 'AWS::IAM::Policy'
Condition: HasIAMUserSSHAccess
Properties:
Roles:
- !Ref ScanIAMRole
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/*'
Logs:
Type: 'AWS::Logs::LogGroup'
Properties:
RetentionInDays: !Ref LogsRetentionInDays
ScanLaunchConfiguration:
Type: 'AWS::AutoScaling::LaunchConfiguration'
Metadata:
'AWS::CloudFormation::Init':
configSets:
default: [!If [HasSwapSize, swap, !Ref 'AWS::NoValue'], cloudwatch, !If [HasIAMUserSSHAccess, ssh-access, !Ref 'AWS::NoValue'], extras1, extras2, config]
swap:
commands:
'a_setup':
command: !Sub 'fallocate -l ${SwapSize}G /swapfile && chmod 600 /swapfile && mkswap /swapfile && swapon /swapfile && echo "/swapfile swap swap defaults 0 0" >> /etc/fstab'
test: '[ ! -f /swapfile ]'
cloudwatch:
packages:
rpm:
cloudwatch: 'https://s3.amazonaws.com/amazoncloudwatch-agent/amazon_linux/amd64/latest/amazon-cloudwatch-agent.rpm'
files:
'/opt/aws/amazon-cloudwatch-agent/etc/amazon-cloudwatch-agent.json': # https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-Agent-Configuration-File-Details.html
content: !Sub |
{
"logs": {
"logs_collected": {
"files": {
"collect_list": [{
"log_group_name": "${Logs}",
"file_path": "/var/log/amazon/amazon-cloudwatch-agent/amazon-cloudwatch-agent.log",
"log_stream_name": "{instance_id}/var/log/amazon/amazon-cloudwatch-agent/amazon-cloudwatch-agent.log",
"timestamp_format": "%Y-%m-%dT%H:%M:%S"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/amazon/amazon-cloudwatch-agent/configuration-validation.log",
"log_stream_name": "{instance_id}/var/log/amazon/amazon-cloudwatch-agent/configuration-validation.log",
"timestamp_format": "%Y/%m/%d %H:%M:%S"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/amazon/ssm/amazon-ssm-agent.log",
"log_stream_name": "{instance_id}/var/log/amazon/ssm/amazon-ssm-agent.log",
"timestamp_format": "%Y-%m-%d %H:%M:%S"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/amazon/ssm/errors.log",
"log_stream_name": "{instance_id}/var/log/amazon/ssm/errors.log",
"timestamp_format": "%Y-%m-%d %H:%M:%S"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/audit/audit.log",
"log_stream_name": "{instance_id}/var/log/audit/audit.log"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/boot.log",
"log_stream_name": "{instance_id}/var/log/boot.log"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/cfn-hup.log",
"log_stream_name": "{instance_id}/var/log/cfn-hup.log",
"timestamp_format": "%Y-%m-%d %H:%M:%S"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/cfn-init-cmd.log",
"log_stream_name": "{instance_id}/var/log/cfn-init-cmd.log",
"timestamp_format": "%Y-%m-%d %H:%M:%S"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/cfn-init.log",
"log_stream_name": "{instance_id}/var/log/cfn-init.log",
"timestamp_format": "%Y-%m-%d %H:%M:%S"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/cfn-wire.log",
"log_stream_name": "{instance_id}/var/log/cfn-wire.log",
"timestamp_format": "%Y-%m-%d %H:%M:%S"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/cloud-init-output.log",
"log_stream_name": "{instance_id}/var/log/cloud-init-output.log"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/cloud-init.log",
"log_stream_name": "{instance_id}/var/log/cloud-init.log",
"timestamp_format": "%b %d %H:%M:%S"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/cron",
"log_stream_name": "{instance_id}/var/log/cron",
"timestamp_format": "%b %-d %H:%M:%S"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/dmesg",
"log_stream_name": "{instance_id}/var/log/dmesg"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/grubby_prune_debug",
"log_stream_name": "{instance_id}/var/log/grubby_prune_debug"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/maillog",
"log_stream_name": "{instance_id}/var/log/maillog",
"timestamp_format": "%b %-d %H:%M:%S"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/messages",
"log_stream_name": "{instance_id}/var/log/messages",
"timestamp_format": "%b %-d %H:%M:%S"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/secure",
"log_stream_name": "{instance_id}/var/log/secure",
"timestamp_format": "%b %-d %H:%M:%S"
}, {
"log_group_name": "${Logs}",
"file_path": "/var/log/yum.log",
"log_stream_name": "{instance_id}/var/log/yum.log",
"timestamp_format": "%b %d %H:%M:%S"
}]
}
}
},
"metrics": {
"namespace": "${AWS::StackName}",
"append_dimensions": {
"AutoScalingGroupName": "${!aws:AutoScalingGroupName}"
},
"metrics_collected": {
"mem": {
"measurement": [
"mem_used_percent"
]
},
"swap": {
"measurement": [
"swap_used_percent"
]
},
"disk": {
"resources": [
"/"
],
"measurement": [
"used_percent"
],
"drop_device": true
}
}
}
}
mode: '000644'
owner: root
group: root
services:
sysvinit:
'amazon-cloudwatch-agent':
enabled: true
ensureRunning: true
files:
- '/opt/aws/amazon-cloudwatch-agent/etc/amazon-cloudwatch-agent.json'
packages:
- cloudwatch
ssh-access:
files:
'/opt/authorized_keys_command.sh':
content: |
#!/bin/bash -e
if [ -z "$1" ]; then
exit 1
fi
UnsaveUserName="$1"
UnsaveUserName=${UnsaveUserName//".plus."/"+"}
UnsaveUserName=${UnsaveUserName//".equal."/"="}
UnsaveUserName=${UnsaveUserName//".comma."/","}
UnsaveUserName=${UnsaveUserName//".at."/"@"}
aws iam list-ssh-public-keys --user-name "$UnsaveUserName" --query "SSHPublicKeys[?Status == 'Active'].[SSHPublicKeyId]" --output text | while read -r KeyId; do
aws iam get-ssh-public-key --user-name "$UnsaveUserName" --ssh-public-key-id "$KeyId" --encoding SSH --query "SSHPublicKey.SSHPublicKeyBody" --output text
done
mode: '000755'
owner: root
group: root
'/opt/import_users.sh':
content: |
#!/bin/bash -e
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=${SaveUserName//"@"/".at."}
if [ "${#SaveUserName}" -le "32" ]; then
if ! id -u "$SaveUserName" >/dev/null 2>&1; then
#sudo will read each file in /etc/sudoers.d, skipping file names that end in ‘~’ or contain a ‘.’ character to avoid causing problems with package manager or editor temporary/backup files.
SaveUserFileName=$(echo "$SaveUserName" | tr "." " ")
/usr/sbin/useradd "$SaveUserName"
echo "$SaveUserName ALL=(ALL) NOPASSWD:ALL" > "/etc/sudoers.d/$SaveUserFileName"
fi
else
echo "Can not import IAM user ${SaveUserName}. User name is longer than 32 characters."
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
commands:
'a_configure_sshd_command':
command: 'sed -e ''/AuthorizedKeysCommand / s/^#*/#/'' -i /etc/ssh/sshd_config; echo -e ''\nAuthorizedKeysCommand /opt/authorized_keys_command.sh'' >> /etc/ssh/sshd_config'
test: '! grep -q ''^AuthorizedKeysCommand /opt/authorized_keys_command.sh'' /etc/ssh/sshd_config'
'b_configure_sshd_commanduser':
command: 'sed -e ''/AuthorizedKeysCommandUser / s/^#*/#/'' -i /etc/ssh/sshd_config; echo -e ''\nAuthorizedKeysCommandUser nobody'' >> /etc/ssh/sshd_config'
test: '! grep -q ''^AuthorizedKeysCommandUser nobody'' /etc/ssh/sshd_config'
'c_import_users':
command: './import_users.sh'
cwd: '/opt'
services:
sysvinit:
sshd:
enabled: true
ensureRunning: true
commands:
- 'a_configure_sshd_command'
- 'b_configure_sshd_commanduser'
extras1:
commands:
a_enable_epel:
command: 'amazon-linux-extras enable epel=7.11 && yum -y clean metadata'
test: "! grep -Fxq '[amzn2extra-epel]' /etc/yum.repos.d/amzn2-extras.repo"
extras2:
packages:
yum:
'epel-release': []
ruby: []
config:
packages:
yum:
clamd: []
clamav: []
'clamav-update': []
rubygems:
daemons: ['1.3.1']
'rubysl-securerandom': ['2.0.0']
files:
'/opt/aws-s3-virusscan/daemon.rb':
content: |
#!/usr/bin/env ruby
require 'daemons'
Daemons.run(__dir__ + '/worker.rb', {:app_name => 's3-virusscan', :monitor => true, :dir_mode => :system, :log_output_syslog => true})
mode: '000744'
owner: root
group: root
'/opt/aws-s3-virusscan/worker.rb':
content: |
#!/usr/bin/env ruby
require 'aws-sdk-sqs'
require 'aws-sdk-sns'
require 'aws-sdk-s3'
require 'json'
require 'uri'
require 'yaml'
require 'syslog/logger'
require 'securerandom'
$log = Syslog::Logger.new 's3-virusscan'
class Worker
attr_reader :conf, :sns, :s3, :tag_key
NO_STATUS = 'no'
CLEAN_STATUS = 'clean'
INFECTED_STATUS = 'infected'
NO_ACTION = 'no'
TAG_ACTION = 'tag'
DELETE_ACTION = 'delete'
def initialize
@conf = YAML::load_file(__dir__ + '/s3-virusscan.conf')
Aws.config.update(region: conf['region'])
@tag_key = conf['tag_key']
@sns = Aws::SNS::Client.new()
@s3 = Aws::S3::Client.new()
end
def run
$log.info "s3-virusscan started"
poller = Aws::SQS::QueuePoller.new(conf['queue'])
max_size = conf['volume_size'] * 1073741824 / 2 # in bytes
poller.poll do |msg|
begin
body = JSON.parse(msg.body)
$log.debug "body #{body}"
if body.key?('Records')
body['Records'].each do |record|
bucket = record['s3']['bucket']['name']
key = URI.decode_www_form_component(record['s3']['object']['key'])
version = record['s3']['object']['versionId']
fileName = "/tmp/#{SecureRandom.uuid}"
if record['s3']['object']['size'] > max_size
$log.info "s3://#{bucket}/#{key} #{version} bigger than half of the EBS volume, skip"
if conf['tag_files']
tag(bucket, key, version, NO_STATUS);
end
publish_notification(bucket, key, version, NO_STATUS, NO_ACTION);
next
end
$log.debug "downloading s3://#{bucket}/#{key} #{version}..."
begin
if version
s3.get_object(
response_target: fileName,
bucket: bucket,
key: key,
version_id: version
)
else
s3.get_object(
response_target: fileName,
bucket: bucket,
key: key
)
end
rescue Aws::S3::Errors::NoSuchKey
$log.info "s3://#{bucket}/#{key} #{version} does no longer exist, skip"
next
end
begin
$log.info "scanning s3://#{bucket}/#{key} #{version}..."
system("clamdscan #{fileName}")
exitstatus = $?.exitstatus
if exitstatus == 0 # No virus found.
if conf['tag_files']
$log.debug "s3://#{bucket}/#{key} #{version} is clean (tagging)"
tag(bucket, key, version, CLEAN_STATUS);
else
$log.debug "s3://#{bucket}/#{key} #{version} is clean"
end
if conf['report_clean']
publish_notification(bucket, key, version, CLEAN_STATUS, NO_ACTION);
end
elsif exitstatus == 1 # Virus(es) found.
if conf['delete']
$log.debug "s3://#{bucket}/#{key} #{version} is infected (deleting)"
s3.delete_object(
bucket: bucket,
key: key
)
publish_notification(bucket, key, version, INFECTED_STATUS, DELETE_ACTION);
elsif conf['tag_files']
$log.debug "s3://#{bucket}/#{key} #{version} is infected (tagging)"
tag(bucket, key, version, INFECTED_STATUS);
publish_notification(bucket, key, version, INFECTED_STATUS, TAG_ACTION);
else
$log.debug "s3://#{bucket}/#{key} #{version} is infected"
publish_notification(bucket, key, version, INFECTED_STATUS, NO_ACTION);
end
else # An error occured.
raise "s3://#{bucket}/#{key} #{version} could not be scanned, clamdscan exit status was #{exitstatus}, retry"
end
ensure
system("rm #{fileName}")
end
end
end
rescue Exception => e
$log.error "message failed: #{e.inspect} #{msg.inspect}"
raise e
end
end
end
private
def tag(bucket, key, version, status)
if version
s3.put_object_tagging(
bucket: bucket,
key: key,
version_id: version,
tagging: {tag_set: [{key: tag_key, value: status}]}
)
else
s3.put_object_tagging(
bucket: bucket,
key: key,
tagging: {tag_set: [{key: tag_key, value: status}]}
)
end
end
def publish_notification(bucket, key, version, status, action)
message_attributes = {
"bucket" => {
data_type: "String",
string_value: bucket
},
"key" => {
data_type: "String",
string_value: key
},
"status" => {
data_type: "String",
string_value: status
},
"action" => {
data_type: "String",
string_value: action
}
}
if version
message_attributes[:version] = {
data_type: "String",
string_value: version
}
end
sns.publish(
topic_arn: conf['topic'],
message: "s3://#{bucket}/#{key} #{version} is #{status}, #{action} action executed",
subject: "s3-virusscan s3://#{bucket}",
message_attributes: message_attributes
)
end
end
begin
Worker.new.run
rescue Exception => e
$log.error "worker failed: #{e.inspect}"
raise e
end
mode: '000744'
owner: root
group: root
'/opt/aws-s3-virusscan/s3-virusscan.conf':
content: !Sub |
delete: ${DeleteInfectedFiles}
report_clean: ${ReportCleanFiles}
tag_files: ${TagFiles}
tag_key: ${TagKey}
region: ${AWS::Region}
queue: ${ScanQueue}
topic: ${FindingsTopic}
volume_size: ${VolumeSize}
mode: '000644'
owner: root
group: root
'/etc/init.d/s3-virusscan':
content: |
#!/usr/bin/env ruby
# chkconfig: - 80 20
APP_NAME = 's3-virusscan'
APP_PATH = '/opt/aws-s3-virusscan/daemon.rb'
case ARGV.first
when 'start'
puts "Starting #{APP_NAME}..."
system(APP_PATH, 'start')
exit($?.exitstatus)
when 'stop'
system(APP_PATH, 'stop')
exit($?.exitstatus)
when 'restart'
system(APP_PATH, 'restart')
exit($?.exitstatus)
when 'status'
system(APP_PATH, 'status')
exit($?.exitstatus)
end
unless %w{start stop restart status}.include? ARGV.first
puts "Usage: #{APP_NAME} {start|stop|restart|status}"
exit(1)
end
mode: '000755'
owner: root
group: root
'/etc/cfn/cfn-hup.conf':
content: !Sub |
[main]
stack=${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.ScanLaunchConfiguration.Metadata.AWS::CloudFormation::Init
action=/opt/aws/bin/cfn-init -v --stack ${AWS::StackName} --resource ScanLaunchConfiguration --region ${AWS::Region}
runas=root
commands:
a_enable_freshclam_cron:
command: 'sed -i "s/^FRESHCLAM_DELAY/#FRESHCLAM_DELAY/g" /etc/sysconfig/freshclam'
b_enable_freshclam:
command: 'sed -i "s/^Example/#Example/g" /etc/freshclam.conf'
c_prepare_local_sopcket:
command: 'mkdir /var/run/clamd.scan && chown clamscan:clamscan /var/run/clamd.scan'
test: '[ ! -d /var/run/clamd.scan ]'
d_enable_clamd_scan:
command: 'sed -i "s/^Example/#Example/g;s/^#LocalSocket /LocalSocket /g" /etc/clamd.d/scan.conf'
e_add_clamdscan_config:
command: 'ln -s /etc/clamd.d/scan.conf /etc/clamd.conf'
test: '[ ! -f /etc/clamd.conf ]'
f_update_clamav_db:
command: freshclam
g_systemctl_enable_clamd:
command: 'systemctl enable clamd@scan'
test: '! systemctl is-enabled clamd@scan'
h_systemctl_start_clamd:
command: 'systemctl start clamd@scan'
test: '! systemctl is-active clamd@scan'
i_gem_install_aws_eventstream: # workaround for https://github.com/aws/aws-sdk-ruby/pull/2573#issuecomment-913984611
command: 'gem install aws-eventstream -v 1.1.1'
test: '! gem list aws-eventstream -i -v 1.1.1'
j_gem_install_aws_partitions: # workaround for https://github.com/aws/aws-sdk-ruby/pull/2573#issuecomment-913984611
command: 'gem install aws-partitions -v 1.493.0'
test: '! gem list aws-partitions -i -v 1.493.0'
k_gem_install_aws_sigv4: # workaround for https://github.com/aws/aws-sdk-ruby/pull/2573#issuecomment-913984611