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35 lines
2.9 KiB
ReStructuredText
Macaroon Caveats
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`Macaroons`_ are issued by Matrix servers as authorization tokens. Macaroons may be restricted by adding caveats to them.
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.. _Macaroons: http://theory.stanford.edu/~ataly/Papers/macaroons.pdf
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Caveats can only be used for reducing the scope of a token, never for increasing it. Servers are required to reject any macroon with a caveat that they do not understand.
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Some caveats are specified in this specification, and must be understood by all servers. The use of non-standard caveats is allowed.
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All caveats must take the form:
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`key` `operator` `value`
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where `key` is a non-empty string drawn from the character set [A-Za-z0-9_]
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`operator` is a non-empty string which does not contain whitespace
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`value` is a non-empty string
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And these are joined by single space characters.
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Specified caveats:
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+-------------+--------------------------------------------------+------------------------------------------------------------------------------------------------+
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| Caveat name | Description | Legal Values |
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+-------------+--------------------------------------------------+------------------------------------------------------------------------------------------------+
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| gen | Generation of the macaroon caveat spec. | 1 |
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| user_id | ID of the user for which this macaroon is valid. | Pure equality check. Operator must be =. |
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| type | The purpose of this macaroon. | access - used to authorize any action except token refresh |
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| refresh - only used to authorize a token refresh |
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| time | Time before/after which this macaroon is valid. | A POSIX timestamp in milliseconds (in UTC). |
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| Operator < means the macaroon is valid before the timestamp, as interpreted by the server. |
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| Operator > means the macaroon is valid after the timestamp, as interpreted by the server. |
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| Operator == means the macaroon is valid at exactly the timestamp, as interpreted by the server.|
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| Note that exact equality of time is largely meaningless. |
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+-------------+--------------------------------------------------+------------------------------------------------------------------------------------------------+
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