Aws Security Audit

# List users without MFA
aws iam get-credential-report --output text | \
  awk -F, '$4=="false" && $1!="<root_account>" {print $1}'

# Find unused IAM users (no activity in 90 days)
aws iam list-users --query 'Users[*].[UserName]' --output text | \
while read user; do
  last_used=$(aws iam get-user --user-name "$user" \
    --query 'User.PasswordLastUsed' --output text)
  echo "$user: $last_used"
done

# List overly permissive policies (AdministratorAccess)
aws iam list-policies --scope Local \
  --query 'Policies[?PolicyName==`AdministratorAccess`]'

# Find access keys older than 90 days
aws iam list-users --query 'Users[*].UserName' --output text | \
while read user; do
  aws iam list-access-keys --user-name "$user" \
    --query 'AccessKeyMetadata[*].[AccessKeyId,CreateDate]' \
    --output text
done

# Check root account access keys
aws iam get-account-summary \
  --query 'SummaryMap.AccountAccessKeysPresent'

# Find security groups open to the world
aws ec2 describe-security-groups \
  --query 'SecurityGroups[?IpPermissions[?IpRanges[?CidrIp==`0.0.0.0/0`]]].[GroupId,GroupName]' \
  --output table

# List public S3 buckets
aws s3api list-buckets --query 'Buckets[*].Name' --output text | \
while read bucket; do
  acl=$(aws s3api get-bucket-acl --bucket "$bucket" 2>/dev/null)
  if echo "$acl" | grep -q "AllUsers"; then
    echo "PUBLIC: $bucket"
  fi
done

# Check VPC Flow Logs status
aws ec2 describe-vpcs --query 'Vpcs[*].VpcId' --output text | \
while read vpc; do
  flow_logs=$(aws ec2 describe-flow-logs \
    --filter "Name=resource-id,Values=$vpc" \
    --query 'FlowLogs[*].FlowLogId' --output text)
  if [ -z "$flow_logs" ]; then
    echo "No flow logs: $vpc"
  fi
done

# Find RDS instances without encryption
aws rds describe-db-instances \
  --query 'DBInstances[?StorageEncrypted==`false`].[DBInstanceIdentifier]' \
  --output table

# Find unencrypted EBS volumes
aws ec2 describe-volumes \
  --query 'Volumes[?Encrypted==`false`].[VolumeId,Size,State]' \
  --output table

# Check S3 bucket encryption
aws s3api list-buckets --query 'Buckets[*].Name' --output text | \
while read bucket; do
  encryption=$(aws s3api get-bucket-encryption \
    --bucket "$bucket" 2>&1)
  if echo "$encryption" | grep -q "ServerSideEncryptionConfigurationNotFoundError"; then
    echo "No encryption: $bucket"
  fi
done

# Find RDS snapshots that are public
aws rds describe-db-snapshots \
  --query 'DBSnapshots[*].[DBSnapshotIdentifier]' --output text | \
while read snapshot; do
  attrs=$(aws rds describe-db-snapshot-attributes \
    --db-snapshot-identifier "$snapshot" \
    --query 'DBSnapshotAttributesResult.DBSnapshotAttributes[?AttributeName==`restore`].AttributeValues' \
    --output text)
  if echo "$attrs" | grep -q "all"; then
    echo "PUBLIC SNAPSHOT: $snapshot"
  fi
done

# Check KMS key rotation
aws kms list-keys --query 'Keys[*].KeyId' --output text | \
while read ke