Identity and Access Management Contd

IAM Policy Grammar

• Refer Here for the Grammar/syntax/structure
• Important Links:
  • Refer Here for Actions, Resources and conditions for all aws services
• If the action and resource is not mentioned in Policy that means it is denied.
• IAM Policy: Learn by understanding
• Policy 1

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "dynamodb:*",
                "dax:*",
                "application-autoscaling:DeleteScalingPolicy",
                "application-autoscaling:DeregisterScalableTarget",
                "application-autoscaling:DescribeScalableTargets",
                "application-autoscaling:DescribeScalingActivities",
                "application-autoscaling:DescribeScalingPolicies",
                "application-autoscaling:PutScalingPolicy",
                "application-autoscaling:RegisterScalableTarget",
                "cloudwatch:DeleteAlarms",
                "cloudwatch:DescribeAlarmHistory",
                "cloudwatch:DescribeAlarms",
                "cloudwatch:DescribeAlarmsForMetric",
                "cloudwatch:GetMetricStatistics",
                "cloudwatch:ListMetrics",
                "cloudwatch:PutMetricAlarm",
                "cloudwatch:GetMetricData",
                "datapipeline:ActivatePipeline",
                "datapipeline:CreatePipeline",
                "datapipeline:DeletePipeline",
                "datapipeline:DescribeObjects",
                "datapipeline:DescribePipelines",
                "datapipeline:GetPipelineDefinition",
                "datapipeline:ListPipelines",
                "datapipeline:PutPipelineDefinition",
                "datapipeline:QueryObjects",
                "ec2:DescribeVpcs",
                "ec2:DescribeSubnets",
                "ec2:DescribeSecurityGroups",
                "iam:GetRole",
                "iam:ListRoles",
                "kms:DescribeKey",
                "kms:ListAliases",
                "sns:CreateTopic",
                "sns:DeleteTopic",
                "sns:ListSubscriptions",
                "sns:ListSubscriptionsByTopic",
                "sns:ListTopics",
                "sns:Subscribe",
                "sns:Unsubscribe",
                "sns:SetTopicAttributes",
                "lambda:CreateFunction",
                "lambda:ListFunctions",
                "lambda:ListEventSourceMappings",
                "lambda:CreateEventSourceMapping",
                "lambda:DeleteEventSourceMapping",
                "lambda:GetFunctionConfiguration",
                "lambda:DeleteFunction",
                "resource-groups:ListGroups",
                "resource-groups:ListGroupResources",
                "resource-groups:GetGroup",
                "resource-groups:GetGroupQuery",
                "resource-groups:DeleteGroup",
                "resource-groups:CreateGroup",
                "tag:GetResources",
                "kinesis:ListStreams",
                "kinesis:DescribeStream",
                "kinesis:DescribeStreamSummary"
            ],
            "Effect": "Allow",
            "Resource": "*"
        },
        {
            "Action": "cloudwatch:GetInsightRuleReport",
            "Effect": "Allow",
            "Resource": "arn:aws:cloudwatch:*:*:insight-rule/DynamoDBContributorInsights*"
        },
        {
            "Action": [
                "iam:PassRole"
            ],
            "Effect": "Allow",
            "Resource": "*",
            "Condition": {
                "StringLike": {
                    "iam:PassedToService": [
                        "application-autoscaling.amazonaws.com",
                        "application-autoscaling.amazonaws.com.cn",
                        "dax.amazonaws.com"
                    ]
                }
            }
        },
        {
            "Effect": "Allow",
            "Action": [
                "iam:CreateServiceLinkedRole"
            ],
            "Resource": "*",
            "Condition": {
                "StringEquals": {
                    "iam:AWSServiceName": [
                        "replication.dynamodb.amazonaws.com",
                        "dax.amazonaws.com",
                        "dynamodb.application-autoscaling.amazonaws.com",
                        "contributorinsights.dynamodb.amazonaws.com",
                        "kinesisreplication.dynamodb.amazonaws.com"
                    ]
                }
            }
        }
    ]
}

• Policy 2

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "*",
            "Resource": "*"
        }
    ]
}

• Navigate to IAM and look at EC2 Full Access and S3 Readonly access policies
• Ec2 full access

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": "ec2:*",
            "Effect": "Allow",
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": "elasticloadbalancing:*",
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": "cloudwatch:*",
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": "autoscaling:*",
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": "iam:CreateServiceLinkedRole",
            "Resource": "*",
            "Condition": {
                "StringEquals": {
                    "iam:AWSServiceName": [
                        "autoscaling.amazonaws.com",
                        "ec2scheduled.amazonaws.com",
                        "elasticloadbalancing.amazonaws.com",
                        "spot.amazonaws.com",
                        "spotfleet.amazonaws.com",
                        "transitgateway.amazonaws.com"
                    ]
                }
            }
        }
    ]
}

• S3 Readonly

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:Get*",
                "s3:List*",
                "s3-object-lambda:Get*",
                "s3-object-lambda:List*"
            ],
            "Resource": "*"
        }
    ]
}

• Lets create our own policy which gives full permission on s3 and ec2

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": ["s3:*", "ec2:*", "autoscaling:*", "elasticloadbalancing:*"],
            "Resource": "*"
        }
    ]
}

• Lets create a new policy called as fulls3andec2july23
  
  
  
• Exercise: Try to create a policy from scratch

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
               "ec2:DescribeAvailabilityZones", 
               "ec2:DescribeRouteTables"
            ],
            "Resource": "*"
        }
    ]
}

• Give the policy to create network in AWS (vpc)