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clamav.tf
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clamav.tf
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// Bucket to hold clamav definitions
resource "aws_s3_bucket" "clamav-definitions" {
bucket = "${var.clamav-definitions-bucket}"
acl = "private"
}
resource "aws_iam_role" "clamav" {
name = "clamav"
assume_role_policy = <<EOF
{
"Version": "2012-10-17",
"Statement": [
{
"Action": "sts:AssumeRole",
"Principal": {
"Service": "lambda.amazonaws.com"
},
"Effect": "Allow",
"Sid": ""
}
]
}
EOF
}
resource "aws_iam_policy" "clamav" {
name = "clamav"
policy = <<EOF
{
"Version":"2012-10-17",
"Statement":[
{
"Effect":"Allow",
"Action":[
"logs:CreateLogGroup",
"logs:CreateLogStream",
"logs:PutLogEvents"
],
"Resource":"*"
},
{
"Action":[
"s3:GetObject",
"s3:GetObjectTagging",
"s3:PutObject",
"s3:PutObjectTagging",
"s3:PutObjectVersionTagging"
],
"Effect":"Allow",
"Resource":"arn:aws:s3:::${aws_s3_bucket.clamav-definitions.bucket}/*"
}
]
}
EOF
}
resource "aws_iam_role_policy_attachment" "clamav" {
role = "${aws_iam_role.clamav.name}"
policy_arn = "${aws_iam_policy.clamav.arn}"
}
resource "aws_lambda_function" "update-clamav-definitions" {
filename = "${path.module}/lambda.zip"
function_name = "update-clamav-definitions"
role = "${aws_iam_role.clamav.arn}"
handler = "update.lambda_handler"
source_code_hash = "${base64sha256(file("${path.module}/lambda.zip"))}"
runtime = "python2.7"
timeout = 300
memory_size = 512
environment {
variables = {
AV_DEFINITION_S3_BUCKET = "${aws_s3_bucket.clamav-definitions.bucket}"
}
}
}
// Cloudwatch event that fires every three hours
resource "aws_cloudwatch_event_rule" "every-three-hours" {
name = "every-three-hours"
description = "Fires every three hours"
schedule_expression = "rate(3 hours)"
}
// A rule to call a lambda function when the Cloudwatch event fires
resource "aws_cloudwatch_event_target" "update-clamav-definitions" {
rule = "${aws_cloudwatch_event_rule.every-three-hours.name}"
target_id = "update-clamav-definitions"
arn = "${aws_lambda_function.update-clamav-definitions.arn}"
}
// Permissions to allow the Cloudwatch event to call our Lambda function
resource "aws_lambda_permission" "allow_cloudwatch_to_update_antivirus" {
statement_id = "AllowExecutionFromCloudWatch"
action = "lambda:InvokeFunction"
function_name = "${aws_lambda_function.update-clamav-definitions.function_name}"
principal = "events.amazonaws.com"
source_arn = "${aws_cloudwatch_event_rule.every-three-hours.arn}"
}