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41 lines
1.7 KiB
CoffeeScript
41 lines
1.7 KiB
CoffeeScript
Path = require("path")
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fs = require("fs")
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Settings = require("settings-sharelatex")
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logger = require("logger-sharelatex")
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url = require "url"
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module.exports = ForbidSymlinks = (staticFn, root, options) ->
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expressStatic = staticFn root, options
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basePath = Path.resolve(root)
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return (req, res, next) ->
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path = url.parse(req.url)?.pathname
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# check that the path is of the form /project_id_or_name/path/to/file.log
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if result = path.match(/^\/?([a-zA-Z0-9_-]+)\/(.*)/)
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project_id = result[1]
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file = result[2]
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else
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logger.warn path: path, "unrecognized file request"
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return res.sendStatus(404)
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# check that the file does not use a relative path
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for dir in file.split('/')
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if dir == '..'
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logger.warn path: path, "attempt to use a relative path"
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return res.sendStatus(404)
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# check that the requested path is normalized
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requestedFsPath = "#{basePath}/#{project_id}/#{file}"
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if requestedFsPath != Path.normalize(requestedFsPath)
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logger.error path: requestedFsPath, "requestedFsPath is not normalized"
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return res.sendStatus(404)
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# check that the requested path is not a symlink
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fs.realpath requestedFsPath, (err, realFsPath)->
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if err?
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if err.code == 'ENOENT'
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return res.sendStatus(404)
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else
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logger.error err:err, requestedFsPath:requestedFsPath, realFsPath:realFsPath, path: req.params[0], project_id: req.params.project_id, "error checking file access"
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return res.sendStatus(500)
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else if requestedFsPath != realFsPath
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logger.warn requestedFsPath:requestedFsPath, realFsPath:realFsPath, path: req.params[0], project_id: req.params.project_id, "trying to access a different file (symlink), aborting"
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return res.sendStatus(404)
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else
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expressStatic(req, res, next)
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