An instance profile is a container for an IAM role that you can use to pass role information to an EC2 instance when the instance starts.
http://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_use_switch-role-ec2_instance-profiles.html
Azure also supports IAM.
Microsoft Azure identity and access management solutions help IT protect access to applications and resources across the corporate data center and into the cloud. This enables additional levels of validation, such as multifactor authentication and conditional access policies. Monitoring suspicious activity through advanced security reporting, auditing and alerting helps mitigate potential security issues.
More detailed information please refer to this link.
Update:
You do have the ability to create Signed Access Signatures for all three Windows Azure Storage services (BLOBs, Queues and Tables) as well as for Windows Azure Service Bus Brokered Messages (Queues, Topics & Subscriptions). I have a similar question with you, maybe you could check.