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Valentin Kleibel

controller: Handle UnicodeDecodeError from webob decoding invalid URLs

webob will try to utf-8 decode all %-encoded bytes in URL-parameters, but will
not handle Unicode erors ... and neither did Kallithea. Visiting a URL like
http://localhost:5000/?%AD would thus give an unhandled exception showing
"Internal Server Error" to the user, and logging the full traceback and:

WebApp Error: UnicodeDecodeError: 'utf-8' codec can't decode byte 0xad in position 0: invalid start byte

This has been seen a lot recently from attackers probing for a php
vulnerability
https://devco.re/blog/2024/06/06/security-alert-cve-2024-4577-php-cgi-argument-injection-vulnerability-en/ .

Now handle these exceptions more nicely and reject with "400 Bad Request".

syntax: glob
*.pyc
*.swp
*.sqlite
*.tox
*.egg-info
*.egg
*.mo
*.orig
*.rej
*.bak
.eggs/

syntax: regexp
^extensions\.py$
^build$
^dist$
^docs/build$
^docs/_build$
^data$
^sql_dumps$
^\.settings$
^\.project$
^\.pydevproject$
^\.coverage$
^kallithea/front-end/node_modules$
^kallithea/front-end/package-lock\.json$
^kallithea/front-end/theme\.less$
^kallithea/front-end/tmp$
^kallithea/public/codemirror$
^kallithea/public/css/select2-spinner\.gif$
^kallithea/public/css/select2\.png$
^kallithea/public/css/select2x2\.png$
^kallithea/public/css/style\.css$
^kallithea/public/css/style\.css\.map$
^kallithea/public/js/bootstrap\.js$
^kallithea/public/js/dataTables\.bootstrap\.js$
^kallithea/public/js/jquery\.atwho\.min\.js$
^kallithea/public/js/jquery\.caret\.min\.js$
^kallithea/public/js/jquery\.dataTables\.js$
^kallithea/public/js/jquery\.flot\.js$
^kallithea/public/js/jquery\.flot\.selection\.js$
^kallithea/public/js/jquery\.flot\.time\.js$
^kallithea/public/js/jquery\.min\.js$
^kallithea/public/js/select2\.js$
^kallithea\.db$
^test\.db$
^Kallithea\.egg-info$
^my\.ini$
^fabfile\.py$
^\.idea$
^\.cache$
^\.pytest_cache$
^venv$
/__pycache__$
^deps\.dot$
^deps\.svg$
^deps\.txt$
^\.pytype/