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Kegsay 2015-10-13 15:47:56 +01:00
parent 87f656ee0a
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15
drafts/human-id-rules.rst
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@ -35,15 +35,20 @@ User ID Localparts:
- MUST NOT contain one of the 107 blacklisted characters on this list: - MUST NOT contain one of the 107 blacklisted characters on this list:
http://kb.mozillazine.org/Network.IDN.blacklist_chars http://kb.mozillazine.org/Network.IDN.blacklist_chars
- After stripping " 0-9, +, -, [, ], _, and the space character it MUST NOT - After stripping " 0-9, +, -, [, ], _, and the space character it MUST NOT
contain characters from >1 language, defined by http://cldr.unicode.org/ contain characters from >1 language, defined by the `exemplar characters`_
on http://cldr.unicode.org/
.. _exemplar characters: http://cldr.unicode.org/translation/characters#TOC-Exemplar-Characters
Room Alias Localparts: Room Alias Localparts:
- MUST NOT contain a ``:`` - MUST NOT contain a ``:``
- MUST NOT contain one of the 107 blacklisted characters on this list: - MUST NOT contain one of the 107 blacklisted characters on this list:
http://kb.mozillazine.org/Network.IDN.blacklist_chars http://kb.mozillazine.org/Network.IDN.blacklist_chars
- After stripping " 0-9, +, -, [, ], _, and the space character it MUST NOT - After stripping " 0-9, +, -, [, ], _, and the space character it MUST NOT
contain characters from >1 language, defined by http://cldr.unicode.org/ contain characters from >1 language, defined by the `exemplar characters`_
on http://cldr.unicode.org/
.. _exemplar characters: http://cldr.unicode.org/translation/characters#TOC-Exemplar-Characters
In the event of a failed user ID check, well behaved homeservers MUST: In the event of a failed user ID check, well behaved homeservers MUST:
- Rewrite user IDs in the offending events to be punycode with an additional ``@`` - Rewrite user IDs in the offending events to be punycode with an additional ``@``
@ -79,11 +84,13 @@ Each ID is split into segments (localpart/domain) around the ``:``. For
this reason, ``:`` is a reserved character and cannot be a localpart character. this reason, ``:`` is a reserved character and cannot be a localpart character.
The 107 blacklisted characters are used to prevent non-printable characters and The 107 blacklisted characters are used to prevent non-printable characters and
spaces from being used. The decision to ban characters from more than 1 language spaces from being used. The decision to ban characters from more than 1 language
matches the behaviour of Google Chrome for IDN handling. This is to protect matches the behaviour of `Google Chrome for IDN handling`_. This is to protect
against common homograph attacks such as ebаy.com (Cyrillic "a", rest is against common homograph attacks such as ebаy.com (Cyrillic "a", rest is
English). This would always result in a failed check. Even with this though English). This would always result in a failed check. Even with this though
there are limitations. For example, сахар is entirely Cyrillic, whereas caxap is there are limitations. For example, сахар is entirely Cyrillic, whereas caxap is
entirely Latin. entirely Latin.
.. _Google Chrome for IDN handling: https://www.chromium.org/developers/design-documents/idn-in-google-chrome
User ID localparts cannot start with ``@`` so that a namespace of localparts User ID localparts cannot start with ``@`` so that a namespace of localparts
beginning with ``@`` can be created. This namespace is used for user IDs which beginning with ``@`` can be created. This namespace is used for user IDs which