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diff --git a/test/integration/test-apt-update-nofallback b/test/integration/test-apt-update-nofallback
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+#!/bin/sh
+#
+# ensure we never fallback from a signed to a unsigned repo
+#
+# hash checks are done in
+#
+set -e
+
+simulate_mitm_and_inject_evil_package()
+{
+ rm -f $APTARCHIVE/dists/unstable/InRelease
+ rm -f $APTARCHIVE/dists/unstable/Release.gpg
+ inject_evil_package
+}
+
+inject_evil_package()
+{
+ cat > $APTARCHIVE/dists/unstable/main/binary-i386/Packages <<EOF
+Package: evil
+Installed-Size: 29
+Maintainer: Joe Sixpack <joe@example.org>
+Architecture: all
+Version: 1.0
+Filename: pool/evil_1.0_all.deb
+Size: 1270
+Description: an autogenerated evil package
+EOF
+ # avoid ims hit
+ touch -d '+1hour' aptarchive/dists/unstable/main/binary-i386/Packages
+}
+
+assert_update_is_refused_and_last_good_state_used()
+{
+ testfailureequal "E: The repository 'file: unstable Release.gpg' is no longer signed." aptget update -qq
+
+ assert_repo_is_intact
+}
+
+assert_repo_is_intact()
+{
+ testsuccessequal "foo/unstable 2.0 all" apt list -q
+ testsuccess aptget install -y -s foo
+ testfailure aptget install -y evil
+ testsuccess aptget source foo --print-uris
+
+ LISTDIR=rootdir/var/lib/apt/lists
+ if ! ( ls $LISTDIR/*InRelease >/dev/null 2>&1 ||
+ ls $LISTDIR/*Release.gpg >/dev/null 2>&1 ); then
+ echo "Can not find InRelease/Release.gpg in $(ls $LISTDIR)"
+ msgfail
+ fi
+}
+
+setupaptarchive_with_lists_clean()
+{
+ setupaptarchive --no-update
+ rm -rf rootdir/var/lib/apt/lists
+}
+
+test_from_inrelease_to_unsigned()
+{
+ # setup archive with InRelease file
+ setupaptarchive_with_lists_clean
+ testsuccess aptget update
+ listcurrentlistsdirectory > lists.before
+
+ simulate_mitm_and_inject_evil_package
+ assert_update_is_refused_and_last_good_state_used
+ testfileequal lists.before "$(listcurrentlistsdirectory)"
+}
+
+test_from_release_gpg_to_unsigned()
+{
+ # setup archive with Release/Release.gpg (but no InRelease)
+ setupaptarchive_with_lists_clean
+ rm $APTARCHIVE/dists/unstable/InRelease
+ testsuccess aptget update
+ listcurrentlistsdirectory > lists.before
+
+ simulate_mitm_and_inject_evil_package
+ assert_update_is_refused_and_last_good_state_used
+ testfileequal lists.before "$(listcurrentlistsdirectory)"
+}
+
+test_from_inrelease_to_unsigned_with_override()
+{
+ # setup archive with InRelease file
+ setupaptarchive_with_lists_clean
+ # FIXME: is not what the server reported 4104 4106
+ testsuccess aptget update #-o Debug::pkgAcquire::Worker=1
+
+ # simulate moving to a unsigned but otherwise valid repo
+ simulate_mitm_and_inject_evil_package
+ generatereleasefiles
+
+ # and ensure we can update to it (with enough force)
+ testwarning aptget update --allow-insecure-repositories \
+ -o Acquire::AllowDowngradeToInsecureRepositories=1
+ # but that the individual packages are still considered untrusted
+ testfailureequal "WARNING: The following packages cannot be authenticated!
+ evil
+E: There are problems and -y was used without --force-yes" aptget install -qq -y evil
+}
+
+test_cve_2012_0214()
+{
+ # see https://bugs.launchpad.net/ubuntu/+source/apt/+bug/947108
+ #
+ # it was possible to MITM the download so that InRelease/Release.gpg
+ # are not delivered (404) and a altered Release file was send
+ #
+ # apt left the old InRelease file in /var/lib/apt/lists and downloaded
+ # the unauthenticated Release file too giving the false impression that
+ # Release was authenticated
+ #
+ # Note that this is pretty much impossible nowdays because:
+ # a) InRelease is left as is, not split to InRelease/Release as it was
+ # in the old days
+ # b) we refuse to go from signed->unsigned
+ #
+ # Still worth having a regression test the simulates the condition
+
+ # setup archive with InRelease
+ setupaptarchive_with_lists_clean
+ testsuccess aptget update
+ listcurrentlistsdirectory > lists.before
+
+ # do what CVE-2012-0214 did
+ rm $APTARCHIVE/dists/unstable/InRelease
+ rm $APTARCHIVE/dists/unstable/Release.gpg
+ inject_evil_package
+ # build valid Release file
+ aptftparchive -qq release ./aptarchive > aptarchive/dists/unstable/Release
+
+ assert_update_is_refused_and_last_good_state_used
+ testfileequal lists.before "$(listcurrentlistsdirectory)"
+
+ # ensure there is no _Release file downloaded
+ testfailure ls rootdir/var/lib/apt/lists/*_Release
+}
+
+test_subvert_inrelease()
+{
+ # setup archive with InRelease
+ setupaptarchive_with_lists_clean
+ testsuccess aptget update
+ listcurrentlistsdirectory > lists.before
+
+ # replace InRelease with something else
+ mv $APTARCHIVE/dists/unstable/Release $APTARCHIVE/dists/unstable/InRelease
+
+ testfailureequal "W: Failed to fetch file:${APTARCHIVE}/dists/unstable/InRelease Does not start with a cleartext signature
+
+E: Some index files failed to download. They have been ignored, or old ones used instead." aptget update -qq
+
+ # ensure we keep the repo
+ testfileequal lists.before "$(listcurrentlistsdirectory)"
+ assert_repo_is_intact
+}
+
+test_inrelease_to_invalid_inrelease()
+{
+ # setup archive with InRelease
+ setupaptarchive_with_lists_clean
+ testsuccess aptget update
+ listcurrentlistsdirectory > lists.before
+
+ # now remove InRelease and subvert Release do no longer verify
+ sed -i 's/Codename.*/Codename: evil!'/ $APTARCHIVE/dists/unstable/InRelease
+ inject_evil_package
+
+ testwarningequal "W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: file: unstable InRelease: The following signatures were invalid: BADSIG 5A90D141DBAC8DAE Joe Sixpack (APT Testcases Dummy) <joe@example.org>
+
+W: Failed to fetch file:${APTARCHIVE}/dists/unstable/InRelease The following signatures were invalid: BADSIG 5A90D141DBAC8DAE Joe Sixpack (APT Testcases Dummy) <joe@example.org>
+
+W: Some index files failed to download. They have been ignored, or old ones used instead." aptget update -qq
+
+ # ensure we keep the repo
+ testfailure grep 'evil' rootdir/var/lib/apt/lists/*InRelease
+ testfileequal lists.before "$(listcurrentlistsdirectory)"
+ assert_repo_is_intact
+}
+
+test_release_gpg_to_invalid_release_release_gpg()
+{
+ # setup archive with InRelease
+ setupaptarchive_with_lists_clean
+ rm $APTARCHIVE/dists/unstable/InRelease
+ testsuccess aptget update
+ listcurrentlistsdirectory > lists.before
+
+ # now subvert Release do no longer verify
+ echo "Some evil data" >> $APTARCHIVE/dists/unstable/Release
+ inject_evil_package
+
+ testwarningequal "W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: file: unstable Release.gpg: The following signatures were invalid: BADSIG 5A90D141DBAC8DAE Joe Sixpack (APT Testcases Dummy) <joe@example.org>
+
+W: Failed to fetch file:${APTARCHIVE}/dists/unstable/Release.gpg The following signatures were invalid: BADSIG 5A90D141DBAC8DAE Joe Sixpack (APT Testcases Dummy) <joe@example.org>
+
+W: Some index files failed to download. They have been ignored, or old ones used instead." aptget update -qq
+
+ testfailure grep 'evil' rootdir/var/lib/apt/lists/*Release
+ testfileequal lists.before "$(listcurrentlistsdirectory)"
+ assert_repo_is_intact
+}
+
+
+TESTDIR=$(readlink -f $(dirname $0))
+. $TESTDIR/framework
+
+setupenvironment
+configarchitecture "i386"
+
+# a "normal" package with source and binary
+buildsimplenativepackage 'foo' 'all' '2.0'
+
+# setup the archive and ensure we have a single package that installs fine
+setupaptarchive
+APTARCHIVE=$(readlink -f ./aptarchive)
+assert_repo_is_intact
+
+# test the various cases where a repo may go from signed->unsigned
+msgmsg "test_from_inrelease_to_unsigned"
+test_from_inrelease_to_unsigned
+
+msgmsg "test_from_release_gpg_to_unsigned"
+test_from_release_gpg_to_unsigned
+
+# ensure we do not regress on CVE-2012-0214
+msgmsg "test_cve_2012_0214"
+test_cve_2012_0214
+
+# ensure InRelase can not be subverted
+msgmsg "test_subvert_inrelease"
+test_subvert_inrelease
+
+# ensure we revert to last good state if InRelease does not verify
+msgmsg "test_inrelease_to_invalid_inrelease"
+test_inrelease_to_invalid_inrelease
+
+# ensure we revert to last good state if Release/Release.gpg does not verify
+msgmsg "test_release_gpg_to_invalid_release_release_gpg"
+test_release_gpg_to_invalid_release_release_gpg
+
+# ensure we can override the downgrade error
+msgmsg "test_from_inrelease_to_unsigned_with_override"
+test_from_inrelease_to_unsigned_with_override