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| -rw-r--r-- | bin/tests/system/idna/tests.sh | 378 |
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diff --git a/bin/tests/system/idna/tests.sh b/bin/tests/system/idna/tests.sh new file mode 100644 index 0000000..e38736e --- /dev/null +++ b/bin/tests/system/idna/tests.sh @@ -0,0 +1,378 @@ +#!/bin/sh + +# Copyright (C) Internet Systems Consortium, Inc. ("ISC") +# +# SPDX-License-Identifier: MPL-2.0 +# +# This Source Code Form is subject to the terms of the Mozilla Public +# License, v. 2.0. If a copy of the MPL was not distributed with this +# file, you can obtain one at https://mozilla.org/MPL/2.0/. +# +# See the COPYRIGHT file distributed with this work for additional +# information regarding copyright ownership. + +SYSTEMTESTTOP=.. +. $SYSTEMTESTTOP/conf.sh + +# Set known locale for the tests + +if locale -a | grep -qE "^C\\.(UTF-8|utf8)"; then + LC_ALL="C.UTF-8" +elif locale -a | grep -qE "^en_US\\.(UTF-8|utf8)"; then + LC_ALL="en_US.UTF-8" +fi +export LC_ALL + +# This set of tests check the behavior of the IDNA options in "dig". +# +# "dig" supports two IDNA-related options: +# +# +[no]idnin - Translates a domain name into punycode format before sending +# the query to the server. +# +# Should the input name be a punycode name, "dig +idnin" will also +# validate the punycode, rejecting it if it is invalid. +# +# +[no]idnout - Translates the received punycode domain names into appropriate +# unicode characters before displaying. +# +# The tests run "dig" against an authoritative server configured with a minimal +# root zone and nothing else. As a result, all queries will result in an +# NXDOMAIN. The server will return the qname sent, which "dig" will display +# according to the options selected. This returned string is compared with +# the qname originally sent. +# +# In the comments below, the following nomenclature (taken from RFC 5890) is +# used: +# +# A-label: Label comprising ASCII characters that starts xn-- and whose +# characters after the xn-- are a valid output of the Punycode +# algorithm. +# +# Fake A-label: An A-label whose characters after the xn-- are not valid +# Punycode output. +# +# U-label: Unicode (native character) form of a label. +# +# For the purpose of this test script, U-labels do not include labels that +# comprise purely ASCII characters, which are referred to as "ASCII-labels" +# here. Valid ASCII-labels comprise letters, digits and hyphens and do not +# start with a hyphen. +# +# References: +# 1. http://www.unicode.org/reports/tr46/#Deviations +# 2. http://www.unicode.org/reports/tr46/#IDNAComparison + +# Using dig insecure mode as we are not testing DNSSEC here +DIGCMD="$DIG -i -p ${PORT} @10.53.0.1" + +# Initialize test count and status return +n=0 +status=0 + + +# Function for extracting the qname from the response +# +# This is the first field in the line after the line starting +# ";; QUESTION SECTION:". +# +# The string returned includes the trailing period. + +qname() { + awk 'BEGIN { qs = 0; } \ + /;; QUESTION SECTION:/ { qs = 1; next; } \ + qs == 1 {sub(";", "", $1) ; print $1; exit 0; }' \ + $1 +} + +# Function for performing a test where "dig" is expected to succeed. +# +# $1 - Description of the test +# $2 - Dig command additional options +# $3 - Name being queried +# $4 - The name that is expected to be displayed by "dig". Note that names +# displayed by "dig" will always have a trailing period, so this +# parameter should have that period as well. + +idna_test() { + n=`expr $n + 1` + description=$1 + if [ "$2" != "" ]; then + description="${description}: $2" + fi + echo_i "$description ($n)" + + ret=0 + $DIGCMD $2 $3 > dig.out.$n 2>&1 + if [ $? -ne 0 ]; then + echo_i "failed: dig command returned non-zero status" + ret=1 + else + actual=`qname dig.out.$n` + if [ "$4" != "$actual" ]; then + echo_i "failed: expected answer $4, actual result $actual" + ret=1 + fi + fi + status=`expr $status + $ret` +} + +# Function for performing a test where "dig" is expected to fail +# +# $1 - Description of the test +# $2 - Dig command additional options +# $3 - Name being queried + +idna_fail() { + n=`expr $n + 1` + description=$1 + if [ "$2" != "" ]; then + description="${description}: $2" + fi + echo_i "$description ($n)" + + ret=0 + $DIGCMD $2 $3 > dig.out.$n 2>&1 + if [ $? -eq 0 ]; then + echo_i "failed: dig command unexpectedly succeeded" + ret=1 + fi + status=`expr $status + $ret` +} + +# Function to check that case is preserved for an all-ASCII label. +# +# Without IDNA support, case-preservation is the expected behavior. +# +# With IDNA support... not really. IDNA maps uppercase ASCII characters to +# their lower-case equivalent. When IDNA support in "dig" was updated to +# non-transitional IDNA 2008, the switch "+idnin" was added and made the default +# behaviour. This meant that the command "dig LocalhosT" (no command switches) +# sends the qname "localhost", a change in behavior from earlier versions. +# +# This was felt to be confusing to the significant number of users who are +# not interested in IDNA. For this reason, after "dig" passes the input qname +# through the IDNA conversion, is does a case-insensitive comparison with the +# result. If the two are the same, "dig" can conclude that the qname is +# entirely ASCII and is uses the entered string instead of the converted string +# as the qname. + +ascii_case_preservation_test() { + text="Checking valid ASCII label" + idna_test "$text" "" LocalhosT LocalhosT. + idna_test "$text" "+noidnin +noidnout" LocalhosT LocalhosT. + idna_test "$text" "+noidnin +idnout" LocalhosT LocalhosT. + idna_test "$text" "+idnin +noidnout" LocalhosT LocalhosT. + idna_test "$text" "+idnin +idnout" LocalhosT LocalhosT. +} + +# Function to perform the tests if IDNA is enabled. + +idna_enabled_test() { + echo_i "IDNA is enabled, all IDNA tests will be performed" + # Check that case is preserved on an ASCII label. + + ascii_case_preservation_test + + + # Test of a valid U-label + # + # +noidnin +noidnout: The label is sent as a unicode octet stream and dig + # will display the string in the \nnn format. + # +noidnin +idnout: As for the previous case. + # +idnin +noidnout: The label is converted to the xn-- format. "dig" + # displays the returned xn-- text. + # +idnin +idnout: The label is converted to the xn-- format. "dig" + # converts the returned xn-- string back to the original + # unicode text. + # + # Note that ASCII characters are converted to lower-case. + + text="Checking valid non-ASCII label" + idna_test "$text" "" "München" "M\195\188nchen." + idna_test "$text" "+noidnin +noidnout" "München" "M\195\188nchen." + idna_test "$text" "+noidnin +idnout" "München" "M\195\188nchen." + idna_test "$text" "+idnin +noidnout" "München" "xn--mnchen-3ya." + idna_test "$text" "+idnin +idnout" "München" "münchen." + + + # Tests of transitional processing of a valid U-label + # + # IDNA2003 introduced national character sets but, unfortunately, didn't + # support several characters properly. One of those was the German + # character "ß" (the "Eszett" or "sharp s"), which was interpreted as "ss". + # So the domain “faß.de” domain (for example) was processed as “fass.de”. + # + # This was corrected in IDNA2008, although some vendors that adopted this + # standard chose to keep the existing IDNA2003 translation for this + # character to prevent problems (e.g. people visiting www.faß.example would, + # under IDNA2003, go to www.fass.example but under IDNA2008 would end up at + # www.fa\195\159.example - a different web site). + # + # BIND has adopted a hard transition, so this test checks that these + # transitional mapping is not used. The tests are essentially the same as + # for the valid U-label. + + text="Checking that non-transitional IDNA processing is used" + idna_test "$text" "" "faß.de" "fa\195\159.de." + idna_test "$text" "+noidnin +noidnout" "faß.de" "fa\195\159.de." + idna_test "$text" "+noidnin +idnout" "faß.de" "fa\195\159.de." + idna_test "$text" "+idnin +noidnout" "faß.de" "xn--fa-hia.de." + idna_test "$text" "+idnin +idnout" "faß.de" "faß.de." + + # Another problem character. The final character in the first label mapped + # onto the Greek sigma character ("σ") in IDNA2003. + + text="Second check that non-transitional IDNA processing is used" + idna_test "$text" "" "βόλος.com" "\206\178\207\140\206\187\206\191\207\130.com." + idna_test "$text" "+noidnin +noidnout" "βόλος.com" "\206\178\207\140\206\187\206\191\207\130.com." + idna_test "$text" "+noidnin +idnout" "βόλος.com" "\206\178\207\140\206\187\206\191\207\130.com." + idna_test "$text" "+idnin +noidnout" "βόλος.com" "xn--nxasmm1c.com." + idna_test "$text" "+idnin +idnout" "βόλος.com" "βόλος.com." + + + + # Tests of a valid A-label (i.e. starting xn--) + # + # +noidnout: The string is sent as-is to the server and the returned qname + # is displayed in the same form. + # +idnout: The string is sent as-is to the server and the returned qname + # is displayed as the corresponding U-label. + # + # The "+[no]idnin" flag has no effect in these cases. + + text="Checking valid A-label" + idna_test "$text" "" "xn--nxasmq6b.com" "xn--nxasmq6b.com." + idna_test "$text" "+noidnin +noidnout" "xn--nxasmq6b.com" "xn--nxasmq6b.com." + idna_test "$text" "+noidnin +idnout" "xn--nxasmq6b.com" "βόλοσ.com." + idna_test "$text" "+idnin +noidnout" "xn--nxasmq6b.com" "xn--nxasmq6b.com." + idna_test "$text" "+idnin +idnout" "xn--nxasmq6b.com" "βόλοσ.com." + + # Test of valid A-label in locale that cannot display it + # + # +noidnout: The string is sent as-is to the server and the returned qname + # is displayed in the same form. + # +idnout: The string is sent as-is to the server and the returned qname + # is displayed as the corresponding A-label. + # + # The "+[no]idnout" flag has no effect in these cases. + saved_LC_ALL="${LC_ALL}" + LC_ALL="C" + text="Checking valid A-label in C locale" + label="xn--nxasmq6b.com" + if command -v idn2 >/dev/null && ! idn2 -d "$label" >/dev/null 2>/dev/null; then + idna_test "$text" "" "$label" "$label." + idna_test "$text" "+noidnin +noidnout" "$label" "$label." + idna_test "$text" "+noidnin +idnout" "$label" "$label." + idna_test "$text" "+idnin +noidnout" "$label" "$label." + idna_test "$text" "+idnin +idnout" "$label" "$label." + idna_test "$text" "+noidnin +idnout" "$label" "$label." + fi + LC_ALL="${saved_LC_ALL}" + + + + # Tests of invalid A-labels + # + # +noidnin: The label is sent as-is to the server and dig will display the + # returned fake A-label in the same form. + # +idnin: "dig" should report that the label is not correct. + # + # +[no]idnout: If the label makes it to the server (via +noidnin), "dig" + # should report an error if +idnout is specified. + + # The minimum length of a punycode A-label is 7 characters. Check that + # a shorter label is detected and rejected. + + text="Checking punycode label shorter than minimum valid length" + idna_test "$text" "" "xn--xx" "xn--xx." + idna_test "$text" "+noidnin +noidnout" "xn--xx" "xn--xx." + idna_fail "$text" "+noidnin +idnout" "xn--xx" + idna_fail "$text" "+idnin +noidnout" "xn--xx" + idna_fail "$text" "+idnin +idnout" "xn--xx" + + # Fake A-label - the string does not translate to anything. + + text="Checking fake A-label" + idna_test "$text" "" "xn--ahahah" "xn--ahahah." + idna_test "$text" "+noidnin +noidnout" "xn--ahahah" "xn--ahahah." + idna_fail "$text" "+noidnin +idnout" "xn--ahahah" + idna_fail "$text" "+idnin +noidnout" "xn--ahahah" + idna_fail "$text" "+idnin +idnout" "xn--ahahah" + + # Too long a label. The punycode string is too long (at 64 characters). + # BIND rejects such labels: with +idnin + + label="xn--xflod18hstflod18hstflod18hstflod18hstflod18hstflod18-1iejjjj" + text="Checking punycode label longer than maximum valid length" + idna_fail "$text" "" "$label" + idna_fail "$text" "+noidnin +noidnout" "$label" + idna_fail "$text" "+noidnin +idnout" "$label" + idna_fail "$text" "+idnin +noidnout" "$label" + idna_fail "$text" "+idnin +idnout" "$label" + + + + + # Tests of a valid unicode string but an invalid U-label (input) + # + # Symbols are not valid IDNA2008 names. Check whether dig rejects them + # when they are supplied on the command line to ensure no IDNA2003 + # fallbacks are in place. + # + # +noidnin: "dig" should send unicode octets to the server and display the + # returned qname in the same form. + # +idnin: "dig" should generate an error. + # + # The +[no]idnout options should not have any effect on the test. + + text="Checking invalid input U-label" + idna_test "$text" "" "√.com" "\226\136\154.com." + idna_test "$text" "+noidnin +noidnout" "√.com" "\226\136\154.com." + idna_test "$text" "+noidnin +idnout" "√.com" "\226\136\154.com." + idna_test "$text" "+idnin +noidnout" "√.com" "xn--19g.com." + idna_test "$text" "+idnin +idnout" "√.com" "√.com." + + # Tests of a valid unicode string but an invalid U-label (output) + # + # Symbols are not valid IDNA2008 names. Check whether dig rejects them + # when they are received in DNS responses to ensure no IDNA2003 fallbacks + # are in place. + # + # Note that "+idnin +noidnout" is not tested because libidn2 2.2.0+ parses + # Punycode more strictly than older versions and thus dig fails with that + # combination of options with libidn2 2.2.0+ but succeeds with older + # versions. + # + # +noidnout: "dig" should send the ACE string to the server and display the + # returned qname. + # +idnout: "dig" should generate an error. + # + # The +[no]idnin options should not have any effect on the test. + + text="Checking invalid output U-label" + idna_test "$text" "" "xn--19g" "xn--19g." + idna_test "$text" "+noidnin +noidnout" "xn--19g" "xn--19g." + idna_test "$text" "+noidnin +idnout" "xn--19g" "√." + idna_test "$text" "+idnin +idnout" "xn--19g" "√." +} + + +# Function to perform tests if IDNA is not enabled. + +idna_disabled_test() { + echo_i "IDNA is disabled, only case mapping tests will be performed" + ascii_case_preservation_test +} + + +# Main test begins here + +$FEATURETEST --with-idn +if [ $? -eq 0 ]; then + idna_enabled_test +else + idna_disabled_test +fi + +exit $status |