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20 lines
1.3 KiB
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20 lines
1.3 KiB
Markdown
# Notes on GSS-API Negotiation Mechanism
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https://tools.ietf.org/html/rfc4178
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Client sends an initial negotiation message to the server which specifies the list of mechanisms
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the client can support in order of decreasing preference.
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This message is generated with the ``NewNegTokenInitKrb5`` method.
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The message generated by this function specifies only a kerberos v5 mechanism is supported.
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The RFC states that this message can optionally contain the initial mechanism token
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for the preferred mechanism (KRB5 in this case) of the client. The ``NewNegTokenInitKrb5``
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includes this in the message.
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The server side responds to this message with a one of four messages:
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| Message Type/State | Description |
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|--------------------|-------------|
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| accept-completed | indicates that the initiator-selected mechanism was acceptable to the target, and that the security mechanism token embedded in the first negotiation message was sufficient to complete the authentication |
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| accept-incomplete | At least one more message is needed from the client to establish security context. |
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| reject | Negotiation is being terminated. |
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| request-mic | (this state can only be present in the first reply message from the target) indicates that the MIC token exchange is REQUIRED if per-message integrity services are available | |