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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2Ž‰$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙ--- -- Library methods for handling IDNA domains. -- -- Internationalized Domain Names (IDNs) follow a mechanism to process -- Internationalizing Domain Names in Applications (IDNA) for handling -- characters outside the ASCII repertoire in a standard fashion. IDNs use -- characters drawn from a large repertoire (Unicode), but IDNA allows the -- non-ASCII characters to be represented using only the ASCII characters -- already allowed in so-called host names today. This backward-compatible -- representation is required in existing protocols like DNS, so that IDNs can be -- introduced with no changes to the existing infrastructure. IDNA is -- only meant for processing domain names, not free text. -- -- Client software, such as browsers and emailers, faces a difficult transition -- from the version of international domain names approved in 2003 (IDNA2003), -- to the revision approved in 2010 (IDNA2008). The following functions allows -- the developer and end user to access domains that are valid under either -- system but the default conversion is set to IDNA2008. -- -- IDNA specification solves the problem of extending the repertoire -- of characters that can be used in domain names to include the Unicode -- repertoire (with some restrictions). -- -- Applications can use IDNA to support internationalized domain names -- anywhere that ASCII domain names are already supported, including DNS -- master files and resolver interfaces. The IDNA protocol is contained -- completely within applications. It is not a client-server or peer-to-peer -- protocol: everything is done inside the application itself. When used with -- a DNS resolver library, IDNA is inserted as a "shim" between the application -- and the resolver library. When used for writing names into a DNS zone, IDNA -- is used just before the name is committed to the zone. -- -- References: -- * http://ietf.org/rfc/rfc3490.txt -- * http://tools.ietf.org/html/rfc5890 -- * https://tools.ietf.org/html/rfc5891 -- * http://tools.ietf.org/html/rfc5892 -- * http://www.unicode.org/reports/tr46/ -- -- TODO: -- Add support for mapping right to left scripts for IDNA library. -- References: -- * http://tools.ietf.org/html/rfc5893 -- * http://www.unicode.org/reports/tr9/ -- * http://www.unicode.org/reports/tr46/#Right_to_Left_Scripts -- -- @author Rewanth Cool -- @copyright Same as Nmap--See https://nmap.org/book/man-legal.html local stdnse = require "stdnse" local string = require "string" local math = require "math" local table = require "table" local unicode = require "unicode" local unittest = require "unittest" local punycode = require "punycode" local idnaMappings = require "data.idnaMappings".tbl _ENV = stdnse.module("idna", stdnse.seeall) -- Localize few functions for a tiny speed boost, since these will be -- used frequently. local floor = math.floor local byte = string.byte local char = string.char local find = string.find local match = string.match local reverse = string.reverse local sub = string.sub -- Concatenates the strings and tables (depth = 1) in a given table. -- -- @param tbl A table is given as an input which contains values as string -- or table (depth = 1). -- @return Returns table after concatinating all the values. local function concat_table_in_tables(tbl) local t = {} for _, v in ipairs(tbl) do if type(v) == "table" then for _, q in ipairs(v) do table.insert(t, q) end else table.insert(t, v) end end return t end --- Maps the codepoints of the input to their respective -- codepoints based on the latest IDNA version mapping. -- -- @param decoded_tbl Table of Unicode decoded codepoints. -- @param useSTD3ASCIIRules Boolean value to set the mapping according to IDNA2003 rules. -- useSTD3ASCIIRules=true refers to IDNA2008. -- useSTD3ASCIIRules=false refers to IDNA2003. -- @param transitionalProcessing Processing option to handle deviation codepoints. -- transitionalProcessing=true maps deviation codepoints to the input. -- transitionalProcessing=false maintains original input. -- @param viewDisallowedCodePoints Boolean value to see the list of disallowed codepoints. -- @return Returns table with the list of mapped codepoints. function map(decoded_tbl, useSTD3ASCIIRules, transitionalProcessing, viewDisallowedCodePoints) -- Assigns default values if not specified. -- According to IDNA2008, transitionalProcessing=true (default). if transitionalProcessing == nil then transitionalProcessing = true end if useSTD3ASCIIRules == nil then useSTD3ASCIIRules = true end if viewDisallowedCodePoints == nil then viewDisallowedCodePoints = false end local disallowedCodePoints = {} -- Mapping codepoints based on latest IDNA mapping list. for index, cp in ipairs(decoded_tbl) do local lookup = idnaMappings[cp] if type(lookup) == "number" then decoded_tbl[index] = lookup -- Handles the IDNA deviated set of codepoints. elseif transitionalProcessing and lookup.status == "deviation" then decoded_tbl[index] = lookup[1] -- Removes the IDNA ignored set of codepoints. elseif lookup.status == "ignored" then decoded_tbl[index] = {} end end decoded_tbl = concat_table_in_tables(decoded_tbl) --TODO: -- Map bidi characters. -- Right-to-left domain names. -- References: -- http://unicode.org/reports/tr9/ -- http://www.unicode.org/reports/tr46/#Right_to_Left_Scripts -- http://tools.ietf.org/html/rfc5893 -- Saves the list of disallowed codepoints. if viewDisallowedCodePoints then for index, cp in ipairs(decoded_tbl) do local lookup = idnaMappings[cp] if type(lookup) == "table" then if lookup.status == "disallowed" then table.insert(disallowedCodePoints, cp) end end -- If useSTD3ASCIIRules=true, both the disallowed_STD3_valid and -- disallowed_STD3_mapped are considered as disallowed codepoints. -- To use this part of code, add disallowed_STD3_mapped and disallowed_STD3_valid -- codepoints to idnaMappings.lua. For now, we ignore these because idnaMappings.lua -- is set to support only for the latest version of IDNA. if useSTD3ASCIIRules then if type(lookup) == "table" then if lookup.status == "disallowed_STD3_valid" or lookup.status == "disallowed_STD3_mapped" then table.insert(disallowedCodePoints, cp) end end end end end decoded_tbl = concat_table_in_tables(decoded_tbl) -- If useSTD3ASCIIRules=false, then disallowed_STD3_mapped values are considered -- as mapped codepoints and are mapped with the input. -- To use this part of code, add disallowed_STD3_mapped and disallowed_STD3_valid -- codepoints to idnaMappings.lua. For now, we ignore these because idnaMappings.lua -- is set to support only for the latest version of IDNA. if not useSTD3ASCIIRules then for index, cp in ipairs(decoded_tbl) do local lookup = idnaMappings[cp] if type(lookup) == "table" then if lookup.status == "disallowed_STD3_mapped" then decoded_tbl[index] = lookup[1] end end end end decoded_tbl = concat_table_in_tables(decoded_tbl) return decoded_tbl, disallowedCodePoints end --- Validate the input based on IDNA codepoints validation rules. -- -- @param tableOfTables Table of codepoints of the splitted input. -- @param checkHyphens Boolean flag checks for 0x002D in unusual places. function validate(tableOfTables, checkHyphens) if checkHyphens == nil then checkHyphens = true end -- Validates the list of input codepoints. for _, tbl in ipairs(tableOfTables) do if checkHyphens then -- Checks the 3rd and 4th position of input. if (tbl[3] and tbl[3] == 0x002D) or (tbl[4] and tbl[4] == 0x002D) then return false end -- Checks for starting and ending of input. if tbl[1] == 0x002D or tbl[#tbl] == 0x002D then return false end end for _, v in ipairs(tbl) do if v == 0x002E then return false end end -- TODO: -- 1. Add validation for checkBidi, checkJoiners (if required). -- 2. The label must not begin with a combining mark, that is: General_Category=Mark. end return true end --- Breaks the tables of codepoints using a delimiter. -- -- @param A table is given as an input which contains codepoints. -- @param ASCII value of delimiter is provided. -- @return Returns table of tables after breaking the give table using delimiter. local function breakInput(codepoints, delimiter) local tbl = {} local output = {} local delimiter = delimiter or 0x002E for _, v in ipairs(codepoints) do if v == delimiter then table.insert(output, tbl) tbl = {} else table.insert(tbl, v) end end table.insert(output, tbl) return output end --- Converts the input codepoints into ASCII text based on IDNA rules. -- -- @param codepoints Table of codepoints of decoded input. -- @param tbl Table of optional params. -- @param transitionalProcessing Boolean value. Default: true. -- @param checkHyphens Boolean flag for checking hyphens presence in input. -- Default: true. -- @param checkBidi Boolean flag to represent if the input is of Bidi type. -- Default: false. -- @param checkJoiners Boolean flag to check for ContextJ rules in input. -- Default: false. -- @param useSTD3ASCIIRules Boolean value to represent ASCII rules. Default: true. -- @return Returns the IDNA ASCII format of the input. -- @return Throws nil, if there is any error in conversion. function toASCII(codepoints, transitionalProcessing, checkHyphens, checkBidi, checkJoiners, useSTD3ASCIIRules) -- Assigns default values if not specified. if transitionalProcessing == nil then transitionalProcessing = true end if checkHyphens == nil then checkHyphens = true end -- Bidi refers to right-to-left scripts. -- Labels must satisfy all six of the numbered conditions in RFC 5893, Section 2. -- to use checkBidi functionality. if checkBidi == nil then checkBidi = false end -- Labels must satisify the ContextJ rules to use checkJoiners functionality. if checkJoiners == nil then checkJoiners = false end if useSTD3ASCIIRules == nil then useSTD3ASCIIRules = true end local decoded_tbl, disallowedCodePoints = map(codepoints, useSTD3ASCIIRules, transitionalProcessing) if decoded_tbl == nil then return nil end -- Prints the list of disallowed values in the given input. if #disallowedCodePoints > 0 then stdnse.debug(table.concat(disallowedCodePoints, ", ")) end -- Breaks the codepoints into multiple tables using delimiter. decoded_tbl = breakInput(decoded_tbl, 0x2E) if decoded_tbl == nil then return nil end -- Validates the codepoints and if any invalid codepoint found, returns nil. if not validate(decoded_tbl, checkHyphens) then return nil end for i, label in ipairs(decoded_tbl) do decoded_tbl[i] = punycode.encode_label(label) end return table.concat(decoded_tbl, ".") end --- Converts the input into Unicode codepoints based on IDNA rules. -- -- Note that the input should already be a table of Unicode code points. If -- your input is an ASCII string, convert it by using -- unicode.decode with the unicode.utf8_dec decoder. -- @param codepoints A domain name as a list of code points. -- @param transitionalProcessing Boolean value. Default: true. -- @param checkHyphens Boolean flag for checking hyphens presence in input. -- Default: true. -- @param checkBidi Boolean flag to represent if the input is of Bidi type. -- Default: false. -- @param checkJoiners Boolean flag to check for ContextJ rules in input. -- Default: false. -- @param useSTD3ASCIIRules Boolean value to represent ASCII rules. Default: true. -- @return Returns the Unicode format of the input based on IDNA rules. -- @return Throws nil, if there is any error in conversion. function toUnicode(codepoints, transitionalProcessing, checkHyphens, checkBidi, checkJoiners, useSTD3ASCIIRules) -- Assigns default values if not specified. if transitionalProcessing == nil then transitionalProcessing = true end if checkHyphens == nil then checkHyphens = true end if checkBidi == nil then checkBidi = false end if checkJoiners == nil then checkJoiners = false end if useSTD3ASCIIRules == nil then useSTD3ASCIIRules = true end -- Breaks the codepoints into multiple tables using delimiter. local decoded_tbl, disallowedCodePoints = map(codepoints, useSTD3ASCIIRules, transitionalProcessing) decoded_tbl = breakInput(decoded_tbl, 0x2E) if decoded_tbl == nil then return nil end -- Validates the codepoints and if any invalid codepoint found, returns nil. --if not validate(decoded_tbl, checkHyphens) then -- return nil --end local output = {} for i, label in ipairs(decoded_tbl) do if label[1] == string.byte("x") and label[2] == string.byte("n") and label[3] == string.byte("-") and label[4] == string.byte("-") then local decoded = punycode.decode_label(unicode.encode(label, unicode.utf8_enc)) label = decoded or label end for j = 1, #label do output[#output+1] = label[j] end if i < #decoded_tbl then output[#output+1] = 0x2E end end return output end if not unittest.testing() then return _ENV end -- These are the used for two way testing (both encoding and decoding). local encodingAndDecodingTestCases = { { "\xce\xb1\xcf\x80\xcf\x80\xce\xbb\xce\xb5.\xce\xba\xce\xbf\xce\xbc", "xn--mxairta.xn--vxaei" }, { "a\xe0\xa5\x8db", "xn--ab-fsf" }, { "\xd9\x86\xd8\xa7\xd9\x85\xd9\x87\xd8\xa7\xdb\x8c.com", "xn--mgba3gch31f.com" }, { "\xe0\xb7\x81\xe0\xb7\x8a\xe0\xb6\xbb\xe0\xb7\x93.com", "xn--10cl1a0b.com" }, { "\xd0\xbf\xd1\x80\xd0\xb0\xd0\xb2\xd0\xb8\xd1\x82\xd0\xb5\xd0\xbb\xd1\x8c\xd1\x81\xd1\x82\xd0\xb2\xd0\xbe.\xd1\x80\xd1\x84", "xn--80aealotwbjpid2k.xn--p1ai" }, { "\xe0\xa4\x95\xe0\xa4\xbe\xe0\xa4\xb6\xe0\xa5\x80\xe0\xa4\xaa\xe0\xa5\x81\xe0\xa4\xb0.\xe0\xa4\xad\xe0\xa4\xbe\xe0\xa4\xb0\xe0\xa4\xa4", "xn--11b6bsw3bni.xn--h2brj9c" }, { "rewanthcool.com", "rewanthcool.com" }, { "\xe3\xaf\x99\xe3\xaf\x9c\xe3\xaf\x99\xe3\xaf\x9f.com", "xn--domain.com" } } -- These test cases are used for only converting them into ASCII text. local toASCIITestCases = { { "ma\xc3\xb1ana.com", "xn--maana-pta.com" }, { "RewanthCool.com", "rewanthcool.com" }, { "\xc3\xb6bb.at", "xn--bb-eka.at" }, { "\xe3\x83\x89\xe3\x83\xa1\xe3\x82\xa4\xe3\x83\xb3.\xe3\x83\x86\xe3\x82\xb9\xe3\x83\x88", "xn--eckwd4c7c.xn--zckzah" }, { "\xd0\xb4\xd0\xbe\xd0\xbc\xd0\xb5\xd0\xbd\xd0\xb0.\xd0\xb8\xd1\x81\xd0\xbf\xd1\x8b\xd1\x82\xd0\xb0\xd0\xbd\xd0\xb8\xd0\xb5", "xn--80ahd1agd.xn--80akhbyknj4f" }, { "\xe6\xb5\x8b\xe8\xaf\x95", "xn--0zwm56d" }, { "k\xc3\xb6nigsg\xc3\xa4\xc3\x9fchen", "xn--knigsgsschen-lcb0w" }, { "fa\xc3\x9f.de", "fass.de" }, { "\xce\xb2\xcf\x8c\xce\xbb\xce\xbf\xcf\x82.com", "xn--nxasmq6b.com" }, { "mycharity\xe3\x80\x82org", "mycharity.org" }, { "K\xc3\xb6nigsg\xc3\xa4\xc3\x9fchen", "xn--knigsgsschen-lcb0w" }, { "B\xc3\xbccher.de", "xn--bcher-kva.de" }, { "xn--ma\xc3\xb1ana.com", nil } } -- These test cases are used for only converting them into ASCII text. -- The last two values in a table are outputs for different cases. -- -- Format: -- { -- input unicode string, -- transitional processed output, --transitional=true -- non-transitional processed output --transitional=false -- } local multipleProcessingTestCases = { { "a\xe0\xa5\x8d\xe2\x80\x8cb", "xn--ab-fsf", "xn--ab-fsf604u" }, { "A\xe0\xa5\x8d\xe2\x80\x8cb", "xn--ab-fsf", "xn--ab-fsf604u" }, { "A\xe0\xa5\x8d\xe2\x80\x8Cb", "xn--ab-fsf", "xn--ab-fsf604u" }, { "\xd9\x86\xd8\xa7\xd9\x85\xd9\x87\xe2\x80\x8c\xd8\xa7\xdb\x8c", "xn--mgba3gch31f", "xn--mgba3gch31f060k" }, { "\xd9\x86\xd8\xa7\xd9\x85\xd9\x87\xe2\x80\x8c\xd8\xa7\xdb\x8c.com", "xn--mgba3gch31f.com", "xn--mgba3gch31f060k.com" }, { "\xc3\x9f\xe0\xa7\x81\xe1\xb7\xad\xe3\x80\x82\xd8\xa085", "xn--ss-e2f077r.xn--85-psd", "xn--zca266bwrr.xn--85-psd" }, { "\xc3\x9f\xe0\xa7\x81\xe1\xb7\xad\xe3\x80\x82\xd8\xa08\xe2\x82\x85", "xn--ss-e2f077r.xn--85-psd", "xn--zca266bwrr.xn--85-psd" } } test_suite = unittest.TestSuite:new() for _, v in ipairs(toASCIITestCases) do test_suite:add_test(unittest.equal(toASCII(unicode.decode(v[1], unicode.utf8_dec)), v[2])) end for _, v in ipairs(encodingAndDecodingTestCases) do test_suite:add_test(unittest.equal(toASCII(unicode.decode(v[1], unicode.utf8_dec)), v[2])) test_suite:add_test(unittest.equal(unicode.encode(toUnicode(unicode.decode(v[2], unicode.utf8_dec)), unicode.utf8_enc), v[1])) end for _, v in ipairs(multipleProcessingTestCases) do -- Performs transitional conversion. test_suite:add_test(unittest.equal(toASCII(unicode.decode(v[1], unicode.utf8_dec)), v[2])) -- Performs non-transitional conversion. test_suite:add_test(unittest.equal(toASCII(unicode.decode(v[1], unicode.utf8_dec), false), v[3])) end return _ENV