A server device is configured to receive, from a proxy server, a request by a user device to access a network; obtain information associated with the user device that includes an identifier associated with the user device and context information associated with the user device; determine a level of trust associated with the user device based on the identifier and the context information, where the level of trust is a measure of security risk associated with the user device; generate an access token based on the level of trust, where the access token identifies a level at which the user device is authorized to access the network; and send, to the user device via the proxy server, the access token that enables the proxy server to authorize the user device to access the network at the level identified by the access token.