1f61418c87
git-svn-id: https://beef.googlecode.com/svn/trunk@1321 b87d56ec-f9c0-11de-8c8a-61c5e9addfc9
52 lines
1.5 KiB
Ruby
52 lines
1.5 KiB
Ruby
#
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# Copyright 2011 Wade Alcorn wade@bindshell.net
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# The following file contains patches for WEBrick.
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module WEBrick
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module HTTPServlet
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class FileHandler
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# Prevent directory traversal attacks
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# @param [Object] req Request object
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# @param [Object] res Response object
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def prevent_directory_traversal(req, res)
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raise WEBrick::HTTPStatus::BadRequest, "null character in path" if has_null?(req.path_info)
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if trailing_pathsep?(req.path_info)
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expanded = File.expand_path(req.path_info + "x")
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expanded.chop! # remove trailing "x"
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else
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expanded = File.expand_path(req.path_info)
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end
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req.path_info = expanded
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end
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# Checks if a string contains null characters
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# @param [String] str String to test for null characters
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# @param [Boolean] Whether the string has null characters
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def has_null? (str)
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str.split(//).each {|c|
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return true if c.eql?("\000")
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}
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false
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end
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end
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end
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end
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