From cd023724a7d1e4dcddd21af0e1223dac3421f2c9 Mon Sep 17 00:00:00 2001 From: emaste Date: Wed, 28 Sep 2016 22:04:07 +0000 Subject: MFS r306418: portsnap: only move expected snapshot contents from snap/ to files/ Previously it was possible to smuggle in addional files that would be used by later portsnap runs. Now we only move those files expected to be in the snapshot into files/ and require that there are no unexpected files. This was used by portsnap attacks 2, 3, and 4 in the "non-cryptanalytic attacks against FreeBSD update components" anonymous gist. Approved by: re (gjb) --- usr.sbin/portsnap/portsnap/portsnap.sh | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/usr.sbin/portsnap/portsnap/portsnap.sh b/usr.sbin/portsnap/portsnap/portsnap.sh index 3dcf618..501c530 100644 --- a/usr.sbin/portsnap/portsnap/portsnap.sh +++ b/usr.sbin/portsnap/portsnap/portsnap.sh @@ -691,6 +691,13 @@ fetch_snapshot() { fetch_index_sanity || return 1 # Verify the snapshot contents cut -f 2 -d '|' INDEX.new | fetch_snapshot_verify || return 1 + cut -f 2 -d '|' tINDEX.new INDEX.new | sort -u > files.expected + find snap -mindepth 1 | sed -E 's^snap/(.*)\.gz^\1^' | sort > files.snap + if ! cmp -s files.expected files.snap; then + echo "unexpected files in snapshot." + return 1 + fi + rm files.expected files.snap echo "done." # Move files into their proper locations -- cgit v1.1