EAP Method Update (EMU). Chairs Joseph Salowey ( email@example.com ) Alan DeKok ( firstname.lastname@example.org ). Note Well.
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Joseph Salowey (email@example.com)
Alan DeKok ( firstname.lastname@example.org )
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4.3.3. Mandatory and Optional Attributes
The payload MUST support marking of mandatory and optional attributes, as well as a "NAK" attribute used to communicate disagreements about received attributes.
Mandatory attributes are attributes that a receiver MUST process as per the specification. Optional attributes are attributes that a receiver MAY ignore.
A receiver MUST process mandatory attributes before optional ones. After an attribute has been processed, it SHOULD be marked as no longer being mandatory. If a receiver does not process a mandatory attribute, it MUST ignore everything else in a request, and it MUST send a NAK attribute in response. Similarly, if a receiver expects a mandatory attribute and does not receive one in a request, it MUST send a NAK attribute in the response that contains the set of attributes it expected to receive.
A peer that either sends or receives a NAK attribute MUST treat the session as failing authentication.
The NAK attribute MUST support a description of which mandatory attribute is either required, or is not supported. The NAK attribute MUST be otherwise treated as an optional attribute, and it MUST NOT contain a NAK of the NAK attribute, in order to prevent infinite recursion.