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e66210d2af
For convenience, add a method to SafePath to break a path into components and verify the status of each one. bug: overleaf/sharelatex#908 Signed-off-by: Simon Detheridge <s@sd.ai>
85 lines
2.4 KiB
CoffeeScript
85 lines
2.4 KiB
CoffeeScript
# This file is shared between the frontend and server code of web, so that
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# filename validation is the same in both implementations.
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# Both copies must be kept in sync:
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# app/coffee/Features/Project/SafePath.coffee
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# public/coffee/ide/directives/SafePath.coffee
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load = () ->
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BADCHAR_RX = ///
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[
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\/ # no forward slashes
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\\ # no back slashes
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\* # no asterisk
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\u0000-\u001F # no control characters (0-31)
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\u007F # no delete
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\u0080-\u009F # no unicode control characters (C1)
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\uD800-\uDFFF # no unicode surrogate characters
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]
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///g
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BADFILE_RX = ///
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(^\.$) # reject . as a filename
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| (^\.\.$) # reject .. as a filename
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| (^\s+) # reject leading space
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| (\s+$) # reject trailing space
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///g
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# Put a block on filenames which match javascript property names, as they
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# can cause exceptions where the code puts filenames into a hash. This is a
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# temporary workaround until the code in other places is made safe against
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# property names.
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#
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# The list of property names is taken from
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# ['prototype'].concat(Object.getOwnPropertyNames(Object.prototype))
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BLOCKEDFILE_RX = ///
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^(
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prototype
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|constructor
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|toString
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|toLocaleString
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|valueOf
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|hasOwnProperty
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|isPrototypeOf
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|propertyIsEnumerable
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|__defineGetter__
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|__lookupGetter__
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|__defineSetter__
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|__lookupSetter__
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|__proto__
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)$
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///
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MAX_PATH = 1024 # Maximum path length, in characters. This is fairly arbitrary.
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SafePath =
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clean: (filename) ->
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filename = filename.replace BADCHAR_RX, '_'
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# for BADFILE_RX replace any matches with an equal number of underscores
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filename = filename.replace BADFILE_RX, (match) ->
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return new Array(match.length + 1).join("_")
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# replace blocked filenames 'prototype' with '@prototype'
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filename = filename.replace BLOCKEDFILE_RX, "@$1"
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return filename
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isCleanFilename: (filename) ->
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return SafePath.isAllowedLength(filename) &&
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!BADCHAR_RX.test(filename) &&
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!BADFILE_RX.test(filename) &&
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!BLOCKEDFILE_RX.test(filename)
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isCleanPath: (path) ->
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elements = path.split('/')
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return false if elements[elements.length - 1].length == 0
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for element in elements
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return false if element.length > 0 && !SafePath.isCleanFilename element
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return true
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isAllowedLength: (pathname) ->
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return pathname.length > 0 && pathname.length <= MAX_PATH
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if define?
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define [], load
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else
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module.exports = load()
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