Class: Putpaws::Provision::PolicyGenerator

Inherits:
Object
  • Object
show all
Defined in:
lib/putpaws/provision/policy_generator.rb

Overview

Generates drafts (たたき台) of IAM policies and roles. These are starting points to review and edit by hand before creating.

Constant Summary collapse

ECS_TASKS_TRUST = 
{
  Version: '2012-10-17',
  Statement: [{Effect: 'Allow', Principal: {Service: 'ecs-tasks.amazonaws.com'}, Action: 'sts:AssumeRole'}]
}
CODEBUILD_TRUST = 
{
  Version: '2012-10-17',
  Statement: [{Effect: 'Allow', Principal: {Service: 'codebuild.amazonaws.com'}, Action: 'sts:AssumeRole'}]
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ PolicyGenerator

Returns a new instance of PolicyGenerator.



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# File 'lib/putpaws/provision/policy_generator.rb', line 32

def initialize(config)
  @config = config
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/putpaws/provision/policy_generator.rb', line 31

def config
  @config
end

Instance Method Details

#account_id ⇒ Object 



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# File 'lib/putpaws/provision/policy_generator.rb', line 38

def ; config.; end

#codebuild_role_draft ⇒ Object 



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# File 'lib/putpaws/provision/policy_generator.rb', line 124

def codebuild_role_draft
  {
    SuggestedRoleName: "#{service_name}-codebuild",
    SuggestedPolicyName: "#{service_name}-codebuild-policy",
    AssumeRolePolicyDocument: CODEBUILD_TRUST,
    PolicyDocument: {
      Version: '2012-10-17',
      Statement: [
        {
          Sid: 'WriteBuildLogs',
          Effect: 'Allow',
          Action: %w[logs:CreateLogStream logs:PutLogEvents],
          Resource: "arn:aws:logs:#{region}:#{}:log-group:#{config.build_log_group}:*",
        },
        {
          Sid: 'EcrAuth',
          Effect: 'Allow',
          Action: %w[ecr:GetAuthorizationToken],
          Resource: '*',
        },
        {
          Sid: 'EcrPushPull',
          Effect: 'Allow',
          Action: %w[
            ecr:BatchCheckLayerAvailability ecr:GetDownloadUrlForLayer ecr:BatchGetImage
            ecr:InitiateLayerUpload ecr:UploadLayerPart ecr:CompleteLayerUpload ecr:PutImage
          ],
          Resource: config.base[:ecr_repository_arn],
        },
        # Deploy at the end of the build:
        # aws ecs update-service --force-new-deployment (+ wait services-stable)
        {
          Sid: 'DeployService',
          Effect: 'Allow',
          Action: %w[ecs:UpdateService ecs:DescribeServices],
          Resource: "arn:aws:ecs:#{region}:#{}:service/#{config.cluster_name}/#{service_name}",
        },
        # Required because builds run inside the VPC (vpc_config).
        {
          Sid: 'ManageBuildEni',
          Effect: 'Allow',
          Action: %w[
            ec2:CreateNetworkInterface ec2:DescribeNetworkInterfaces ec2:DeleteNetworkInterface
            ec2:DescribeSubnets ec2:DescribeSecurityGroups ec2:DescribeDhcpOptions ec2:DescribeVpcs
          ],
          Resource: '*',
        },
        {
          Sid: 'CreateBuildEniPermission',
          Effect: 'Allow',
          Action: %w[ec2:CreateNetworkInterfacePermission],
          Resource: "arn:aws:ec2:#{region}:#{}:network-interface/*",
          Condition: {
            StringEquals: {
              'ec2:AuthorizedService' => 'codebuild.amazonaws.com',
              'ec2:Subnet' => (config.base[:subnets] || []).map{|s|
                "arn:aws:ec2:#{region}:#{}:subnet/#{s}"
              },
            }
          },
        },
      ]
    },
  }
end

#region ⇒ Object 



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# File 'lib/putpaws/provision/policy_generator.rb', line 37

def region; config.region; end

#scheduler_role_draft ⇒ Object

Assumed by EventBridge Scheduler to launch tasks (scheduler:deploy). Created for every service so that schedules can be added any time.



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# File 'lib/putpaws/provision/policy_generator.rb', line 192

def scheduler_role_draft
  {
    SuggestedRoleName: "#{service_name}-scheduler",
    SuggestedPolicyName: "#{service_name}-scheduler-policy",
    AssumeRolePolicyDocument: scheduler_trust,
    PolicyDocument: {
      Version: '2012-10-17',
      Statement: [
        {
          Sid: 'RunScheduledTask',
          Effect: 'Allow',
          Action: %w[ecs:RunTask],
          Resource: [
            "arn:aws:ecs:#{region}:#{}:task-definition/#{service_name}-*",
            "arn:aws:ecs:#{region}:#{}:task-definition/#{service_name}-*:*",
          ],
        },
        {
          Sid: 'PassRolesToTasks',
          Effect: 'Allow',
          Action: %w[iam:PassRole],
          Resource: "arn:aws:iam::#{}:role/#{service_name}-*",
        },
      ]
    },
  }
end

#scheduler_trust ⇒ Object 



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# File 'lib/putpaws/provision/policy_generator.rb', line 18

def scheduler_trust
  {
    Version: '2012-10-17',
    Statement: [{
      Effect: 'Allow',
      Principal: {Service: 'scheduler.amazonaws.com'},
      Action: 'sts:AssumeRole',
      # confused deputy protection: only schedules in this account
      Condition: {StringEquals: {'aws:SourceAccount' => }},
    }]
  }
end

#service_name ⇒ Object 



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# File 'lib/putpaws/provision/policy_generator.rb', line 36

def service_name; config.service_name; end

#task_execution_role_draft ⇒ Object 



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# File 'lib/putpaws/provision/policy_generator.rb', line 51

def task_execution_role_draft
  statements = [
    {
      Sid: 'EcrAuth',
      Effect: 'Allow',
      Action: %w[ecr:GetAuthorizationToken],
      Resource: '*',
    },
    {
      Sid: 'EcrPull',
      Effect: 'Allow',
      Action: %w[ecr:BatchCheckLayerAvailability ecr:GetDownloadUrlForLayer ecr:BatchGetImage],
      Resource: config.base[:ecr_repository_arn],
    },
    {
      Sid: 'WriteLogs',
      Effect: 'Allow',
      Action: %w[logs:CreateLogStream logs:PutLogEvents],
      Resource: "arn:aws:logs:#{region}:#{}:log-group:#{config.log_group}:*",
    },
  ]
  unless config.resolved_secrets.empty?
    statements << {
      Sid: 'ReadSecrets',
      Effect: 'Allow',
      Action: %w[ssm:GetParameters],
      Resource: "arn:aws:ssm:#{region}:#{}:parameter#{config.ssm_parameter_prefix}/*",
    }
  end
  {
    SuggestedRoleName: "#{service_name}-task-execution",
    SuggestedPolicyName: "#{service_name}-task-execution-policy",
    AssumeRolePolicyDocument: ECS_TASKS_TRUST,
    PolicyDocument: {Version: '2012-10-17', Statement: statements},
  }
end

#task_role_draft ⇒ Object 



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# File 'lib/putpaws/provision/policy_generator.rb', line 88

def task_role_draft
  statements = [
    {
      Sid: 'EcsExec',
      Effect: 'Allow',
      Action: %w[
        ssmmessages:CreateControlChannel ssmmessages:CreateDataChannel
        ssmmessages:OpenControlChannel ssmmessages:OpenDataChannel
      ],
      Resource: '*',
    },
  ]
  unless Util.blank?(config.base[:ses_identity_arn])
    statements << {
      Sid: 'SendMail',
      Effect: 'Allow',
      Action: %w[ses:SendEmail ses:SendRawEmail],
      Resource: config.base[:ses_identity_arn],
    }
  end
  unless Util.blank?(config.base[:s3_bucket_arn])
    statements << {
      Sid: 'UseBucket',
      Effect: 'Allow',
      Action: %w[s3:GetObject s3:PutObject s3:DeleteObject s3:ListBucket],
      Resource: [config.base[:s3_bucket_arn], "#{config.base[:s3_bucket_arn]}/*"],
    }
  end
  {
    SuggestedRoleName: "#{service_name}-task",
    SuggestedPolicyName: "#{service_name}-task-policy",
    AssumeRolePolicyDocument: ECS_TASKS_TRUST,
    PolicyDocument: {Version: '2012-10-17', Statement: statements},
  }
end

#write_step1_drafts! ⇒ Object 



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# File 'lib/putpaws/provision/policy_generator.rb', line 40

def write_step1_drafts!
  dir = config.policies_dir
  FileUtils.mkdir_p(dir)
  Util.write_json(dir.join('role-task-execution.json'), task_execution_role_draft)
  Util.write_json(dir.join('role-task.json'), task_role_draft)
  Util.write_json(dir.join('role-codebuild.json'), codebuild_role_draft)
  Util.write_json(dir.join('role-scheduler.json'), scheduler_role_draft)
  %w[role-task-execution.json role-task.json role-codebuild.json role-scheduler.json]
    .map{|f| dir.join(f).to_s}
end