#!/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() { testequal "E: The repository 'file: unstable Release.gpg' is no longer signed." aptget update -qq assert_repo_is_intact } assert_repo_is_intact() { testequal "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 testequal "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 $APTARCHIVE/dists/unstable/InRelease testequal "W: Failed to fetch file:${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!'/ $APTARCHIVE/dists/unstable/InRelease inject_evil_package testequal "W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: file: unstable InRelease: The following signatures were invalid: BADSIG 5A90D141DBAC8DAE Joe Sixpack (APT Testcases Dummy) <joe@example.org> W: Failed to fetch file:${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" >> $APTARCHIVE/dists/unstable/Release inject_evil_package testequal "W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: file: unstable Release.gpg: The following signatures were invalid: BADSIG 5A90D141DBAC8DAE Joe Sixpack (APT Testcases Dummy) <joe@example.org> W: Failed to fetch file:${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