Allows uploaded files to include some HTML tag strings that were
previously forbidden in the first 1k or so of the file:
* <a href
* <img
* <pre
* <table
* <title
They are now allowed as long as the IE MIME type detection heuristic
would not change their types. This should reduce the number of false
positive checks in JPEGs with EXIF data with links.
Also deprecates $wgAllowTitlesInSVG and allows it by default.
This should still protect against malformed PNG attacks on old IE
versions, though false positive checks are conceivable on PNG files
containing comments very close to the beginning of the file.
Adds $wgVerifyMimeTypeIE config var to allow disabling the IE checks
entirely, if desired, but leaves it in place by default. These are
more conservative than the checks that were removed.
Added test cases for the old IE5/6 bug and the particular sort of
JPEG metadata that struck false positives previously.
Bug: T27707
Change-Id: I66642a74fce1a1894cad67d62b0da61020db469a
Inkscape mangles namespace definitions created by Adobe Illustrator
(apparently it can't parse custom entities or something, maybe just
in 'xmlns' attributes). These files are still valid SVG, and not
a security issue (although Illustrator probably won't like them),
so it's okay to allow them.
Added tests with some example files.
* buggynamespace-original.svg
File generated by Illustrator (edited by hand to reduce filesize).
Based on <https://commons.wikimedia.org/w/?curid=16495597>.
* buggynamespace-okay.svg
The original file, opened and saved in Inkscape (no other changes).
* buggynamespace-okay2.svg
The original file, opened and saved in Inkscape twice.
* buggynamespace-bad.svg
The original file, edited by hand to remove custom entities.
This is not valid XML and should be rejected (although it's valid
when parsed as HTML, and some image viewers might display it).
* buggynamespace-evilhtml.svg
An SVG file using an entity declared namespace for a namespace
we want to ban. Based on buggynamespace-original.svg.
Bug: T144827
Change-Id: I0eb9766cab86a58d729f10033c64f57d2076d917
The tests currently depend on them never being renamed, which is bad.
(Actual file data in git is de-duplicated automatically AFAIK.)
Change-Id: Id2440326981218f9e7d51541a168db59183fdadf
