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########################### | |
#### Eventbridge event #### | |
########################### | |
resource "aws_cloudwatch_event_rule" "public_snapshot" { | |
name = "public-snapshot" | |
description = "Capture events when Snapshots are made public" | |
event_pattern = <<EOF | |
{ | |
"source": ["aws.ec2"], | |
"detail-type": ["AWS API Call via CloudTrail"], | |
"detail": { | |
"eventSource": ["ec2.amazonaws.com"], | |
"eventName": [ | |
"ModifySnapshotAttribute" | |
], | |
"requestParameters": { | |
"createVolumePermission": { | |
"add": { | |
"items": | |
{ | |
"group": ["all"] | |
} | |
} | |
} | |
} | |
} | |
} | |
EOF | |
} | |
resource "aws_cloudwatch_event_target" "sfn" { | |
rule = aws_cloudwatch_event_rule.public_snapshot.name | |
target_id = "public-snapshot-to-sfn" | |
arn = aws_sfn_state_machine.public_snapshot.arn | |
role_arn = aws_iam_role.event_public_snapshot.arn | |
} | |
########################### | |
##### Eventbridge IAM ##### | |
########################### | |
resource "aws_iam_role" "event_public_snapshot" { | |
name = "public-snapshot-events-role" | |
inline_policy { | |
name = "public-snapshot-events-policy" | |
policy = data.aws_iam_policy_document.events_policy.json | |
} | |
assume_role_policy = jsonencode({ | |
Version = "2012-10-17" | |
Statement = [ | |
{ | |
Action = "sts:AssumeRole" | |
Effect = "Allow" | |
Principal = { | |
Service = "events.amazonaws.com" | |
} | |
}, | |
] | |
}) | |
} | |
data "aws_iam_policy_document" "events_policy" { | |
statement { | |
effect = "Allow" | |
actions = ["states:StartExecution"] | |
resources = [aws_sfn_state_machine.public_snapshot.arn] | |
} | |
} | |
########################### | |
###### Step Function ###### | |
########################### | |
resource "aws_sfn_state_machine" "public_snapshot" { | |
name = "public-snapshot" | |
role_arn = aws_iam_role.sfn_public_snapshot.arn | |
definition = <<EOF | |
{ | |
"Comment": "Removes group:all from snapshots", | |
"StartAt": "RemoveAllPermission", | |
"States": { | |
"RemoveAllPermission": { | |
"Type": "Task", | |
"Resource": "arn:aws:states:::aws-sdk:ec2:modifySnapshotAttribute", | |
"Parameters": { | |
"SnapshotId.$": "$.detail.requestParameters.snapshotId", | |
"CreateVolumePermission": { | |
"Remove": [ { "Group": "all" } ] | |
} | |
}, | |
"End": true | |
} | |
} | |
} | |
EOF | |
} | |
resource "aws_iam_role" "sfn_public_snapshot" { | |
name = "public-snapshot-sfn-role" | |
inline_policy { | |
name = "public-snapshot-sfn-policy" | |
policy = data.aws_iam_policy_document.sfn_policy.json | |
} | |
assume_role_policy = jsonencode({ | |
Version = "2012-10-17" | |
Statement = [ | |
{ | |
Action = "sts:AssumeRole" | |
Effect = "Allow" | |
Principal = { | |
Service = "states.amazonaws.com" | |
} | |
}, | |
] | |
}) | |
} | |
data "aws_iam_policy_document" "sfn_policy" { | |
statement { | |
effect = "Allow" | |
actions = ["ec2:ModifySnapshotAttribute"] | |
resources = ["*"] | |
} | |
} |
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