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ansible-ec2-sts

Following is the process to scan multiple accounts via STS:

  • Step 1: Create a role in the destination account from which we would like to scan the instances from and authorize the user and the account from the source account to AssumeRole

aws iam create-role --path /service/ --role-name cross-access-role --assume-role-policy-document '{ "Version": "2008-10-17", "Statement": [ { "Sid": "", "Effect": "Allow", "Principal": { "AWS": "arn:aws:iam:::user/" }, "Action": "sts:AssumeRole" } ] }'

  • Step 2: Attach a policy to the role to only list instances and describe tags

aws iam put-role-policy --policy-name 'cross-access-policy' --role-name cross-access-role --policy-document '{ "Statement": [ { "Sid": "", "Action": [ "ec2:DescribeInstances", "ec2:DescribeTags", "route53:Get*", "route53:List*", "rds:Describe*", "elasticloadbalancing:Describe*" ], "Effect": "Allow", "Resource": "*" } ] }'

  • Step3: export AWS_ACCESS_KEY_ID=xxxx; export AWS_SECRET_ACCESS_KEY=xxxxxx for the user present in the master account who has access to perform the cross account access