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bpo-27397: Make email module properly handle invalid-length base64 strings (#7583)

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When attempting to base64-decode a payload of invalid length (1 mod 4),
properly recognize and handle it.  The given data will be returned as-is,
i.e. not decoded, along with a new defect, InvalidBase64LengthDefect.
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Tal Einat 2018-06-12 15:46:22 +03:00 • committed by GitHub
parent 5a98209180
commit c3f55be7dd
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7 changed files with 70 additions and 18 deletions
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Doc/library/email.errors.rst
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@ -108,3 +108,7 @@ All defect classes are subclassed from :class:`email.errors.MessageDefect`.
* :class:`InvalidBase64CharactersDefect` -- When decoding a block of base64
encoded bytes, characters outside the base64 alphabet were encountered.
The characters are ignored, but the resulting decoded bytes may be invalid.
* :class:`InvalidBase64LengthDefect` -- When decoding a block of base64 encoded
bytes, the number of non-padding base64 characters was invalid (1 more than
a multiple of 4). The encoded block was kept as-is.