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269 lines
10 KiB
Ruby
269 lines
10 KiB
Ruby
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if ENV['PAPERCLIP_HASH_SECRET'].nil?
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puts "WARNING! Environment variable PAPERCLIP_HASH_SECRET must be set."
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exit 1
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end
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Paperclip::Attachment.default_options.merge!(
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hash_data: ':class/:attachment/:id/:style',
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hash_secret: ENV['PAPERCLIP_HASH_SECRET'],
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preserve_files: true,
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url: '/system/:class/:attachment/:id_partition/:hash/:style/:filename'
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)
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if ENV['PAPERCLIP_STORAGE'] == "s3"
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if ENV['S3_BUCKET'].nil? or ENV['AWS_REGION'].nil? or
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ENV['AWS_ACCESS_KEY_ID'].nil? or ENV['AWS_SECRET_ACCESS_KEY'].nil?
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puts "WARNING! Environment variables S3_BUCKET, AWS_REGION, " +
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"AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY must be set."
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exit 1
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end
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Paperclip::Attachment.default_options.merge!({
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url: ':s3_domain_url',
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path: '/:class/:attachment/:id_partition/:hash/:style/:filename',
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storage: :s3,
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s3_host_name: "s3.#{ENV['AWS_REGION']}.amazonaws.com",
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s3_protocol: 'https',
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s3_credentials: {
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bucket: ENV['S3_BUCKET'],
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access_key_id: ENV['AWS_ACCESS_KEY_ID'],
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secret_access_key: ENV['AWS_SECRET_ACCESS_KEY']
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},
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s3_permissions: {
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original: :private,
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medium: :private
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},
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s3_storage_class: {
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medium: :reduced_redundancy,
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thumb: :reduced_redundancy,
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icon: :reduced_redundancy,
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icon_small: :reduced_redundancy
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}
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})
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elsif ENV['PAPERCLIP_STORAGE'] == "filesystem"
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Paperclip::Attachment.default_options.merge!({
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storage: :filesystem
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})
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end
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Paperclip::Attachment.class_eval do
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def is_stored_on_s3?
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options[:storage].to_sym == :s3
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end
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def fetch
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Paperclip.io_adapters.for self
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end
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end
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module Paperclip
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# Checks file for spoofing
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class MediaTypeSpoofDetector
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def spoofed?
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if has_name? && has_extension? && (media_type_mismatch? ||
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mapping_override_mismatch?)
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Paperclip.log("Content Type Spoof: Filename #{File.basename(@name)} "\
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"(#{supplied_content_type} from Headers, #{content_types_from_name} "\
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"from Extension), content type discovered: "\
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"#{calculated_content_type}. See documentation to allow this "\
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"combination.")
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true
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else
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false
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end
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end
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private
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# Determine file content type from its name
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def content_types_from_name
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@content_types_from_name ||=
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Paperclip.run('mimetype', '-b -- :file_name', file_name: @name).chomp
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end
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# Determine file media type from its name
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def media_types_from_name
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@media_types_from_name ||= extract_media_type content_types_from_name
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end
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# Determine file content type from mimetype command
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def type_from_mimetype_command
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@type_from_mimetype_command ||=
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Paperclip.run('mimetype', '-b -- :file', file: @file.path).chomp
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end
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# Determine file media type from mimetype command
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def media_type_from_mimetype_command
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@media_type_from_mimetype_command ||=
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extract_media_type type_from_mimetype_command
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end
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# Determine file content type from it's content (file and mimetype command)
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def type_from_file_command
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unless defined? @type_from_file_command
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@type_from_file_command =
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Paperclip.run('file', '-b --mime -- :file', file: @file.path)
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.split(/[:;]\s+/).first
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if allowed_spoof_exception?(@type_from_file_command,
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media_type_from_file_command) ||
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(@type_from_file_command.in?(%w(text/plain text/html)) &&
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media_type_from_mimetype_command.in?(%w(text application)))
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# File content type is generalized, so rely on file extension for
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# correct/more specific content type
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@type_from_file_command = type_from_mimetype_command
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end
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end
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@type_from_file_command
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rescue Cocaine::CommandLineError
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''
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end
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# Determine file media type from it's content (file and mimetype command)
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def media_type_from_file_command
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@media_type_from_file_command ||=
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extract_media_type type_from_file_command
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end
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def extract_media_type(content_type)
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if content_type.empty?
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''
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else
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content_type.split('/').first
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end
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end
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def media_type_mismatch?
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calculated_type_mismatch?
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end
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# Checks file media type mismatch between file's name and header
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# NOTE: Can't rely on headers, as different OS can have different file type
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# MIME mappings
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def supplied_type_mismatch?
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!allowed_spoof_exception?(supplied_content_type, supplied_media_type) &&
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media_types_from_name != supplied_media_type
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end
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# Checks file media type mismatch between file's name and content
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def calculated_type_mismatch?
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!allowed_spoof_exception?(calculated_content_type,
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calculated_media_type) &&
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media_types_from_name != calculated_media_type
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end
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# Checks file content type mismatch between file's name and content
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def mapping_override_mismatch?
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!allowed_spoof_exception?(calculated_content_type,
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calculated_media_type) &&
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content_types_from_name != calculated_content_type
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end
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# Check if we have a file spoof exception which is allowed/safe
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def allowed_spoof_exception?(content_type, media_type)
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content_type == 'application/octet-stream' ||
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(content_type == 'inode/x-empty' && @file.size.zero?) ||
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(content_type == 'text/x-c' &&
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content_types_from_name == 'text/x-java') ||
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(media_type.in?(%w(image audio video)) &&
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media_type == media_types_from_name) ||
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(content_types_from_name.in? %W(#{}
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text/plain
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application/octet-stream)) ||
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# Types taken from: http://filext.com/faq/office_mime_types.php and
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# https://www.openoffice.org/framework/documentation/mimetypes/mimetypes.html
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#
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# Generic application
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(Set[content_type, content_types_from_name].subset? Set.new %w(
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text/rtf
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application/rtf
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)) ||
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# Word processor application
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(Set[content_type, content_types_from_name].subset? Set.new %w(
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application/vnd.ms-office
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application/msword
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application/msword-template
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application/vnd.openxmlformats-officedocument.wordprocessingml.document
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application/vnd.openxmlformats-officedocument.wordprocessingml.template
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application/vnd.ms-word.document.macroEnabled.12
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application/vnd.ms-word.template.macroEnabled.12
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application/vnd.oasis.opendocument.text
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application/vnd.oasis.opendocument.text-template
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application/vnd.oasis.opendocument.text-web
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application/vnd.oasis.opendocument.text-master
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application/vnd.sun.xml.writer
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application/vnd.sun.xml.writer.template
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application/vnd.sun.xml.writer.global
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application/vnd.stardivision.writer
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application/vnd.stardivision.writer-global
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application/x-starwriter
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)) ||
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# Spreadsheet application
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(Set[content_type, content_types_from_name].subset? Set.new %w(
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application/zip
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application/vnd.ms-office
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application/vnd.ms-excel
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application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
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application/vnd.openxmlformats-officedocument.spreadsheetml.template
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application/vnd.ms-excel.sheet.macroEnabled.12
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application/vnd.ms-excel.template.macroEnabled.12
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application/vnd.ms-excel.addin.macroEnabled.12
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application/vnd.ms-excel.sheet.binary.macroEnabled.12
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application/vnd.oasis.opendocument.spreadsheet
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application/vnd.oasis.opendocument.spreadsheet-template
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application/vnd.sun.xml.calc
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application/vnd.sun.xml.calc.template
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application/vnd.stardivision.calc
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application/x-starcalc
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application/CDFV2-encrypted
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)) ||
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# Presentation application
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(Set[content_type, content_types_from_name].subset? Set.new %w(
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application/vnd.ms-office
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application/vnd.ms-powerpoint
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application/vnd.openxmlformats-officedocument.presentationml.presentation
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application/vnd.openxmlformats-officedocument.presentationml.template
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application/vnd.openxmlformats-officedocument.presentationml.slideshow
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application/vnd.ms-powerpoint.addin.macroEnabled.12
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application/vnd.ms-powerpoint.presentation.macroEnabled.12
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application/vnd.ms-powerpoint.template.macroEnabled.12
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application/vnd.ms-powerpoint.slideshow.macroEnabled.12
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application/vnd.oasis.opendocument.presentation
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application/vnd.oasis.opendocument.presentation-template
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application/vnd.sun.xml.impress
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application/vnd.sun.xml.impress.template
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application/vnd.stardivision.impress
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application/vnd.stardivision.impress-packed
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application/x-starimpress
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text/x-gettext-translation-template
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)) ||
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# Graphics application
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(Set[content_type, content_types_from_name].subset? Set.new %w(
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application/vnd.ms-office
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application/vnd.oasis.opendocument.graphics
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application/vnd.oasis.opendocument.graphics-template
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application/vnd.sun.xml.draw
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application/vnd.sun.xml.draw.template
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application/vnd.stardivision.draw
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application/x-stardraw
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)) ||
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# Formula application
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(Set[content_type, content_types_from_name].subset? Set.new %w(
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application/vnd.ms-office
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application/vnd.oasis.opendocument.formula
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application/vnd.sun.xml.math
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application/vnd.stardivision.math
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application/x-starmath
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)) ||
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# Chart application
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(Set[content_type, content_types_from_name].subset? Set.new %w(
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application/vnd.ms-office
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application/vnd.oasis.opendocument.chart
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application/vnd.stardivision.chart
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application/x-starchart
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))
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end
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end
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end
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