diff options
Diffstat (limited to 'regress/hostkey-rotate.sh')
| -rw-r--r-- | regress/hostkey-rotate.sh | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/regress/hostkey-rotate.sh b/regress/hostkey-rotate.sh new file mode 100644 index 0000000..5898cbd --- /dev/null +++ b/regress/hostkey-rotate.sh @@ -0,0 +1,152 @@ +# $OpenBSD: hostkey-rotate.sh,v 1.10 2022/01/05 08:25:05 djm Exp $ +# Placed in the Public Domain. + +tid="hostkey rotate" + +# +# GNU (f)grep <=2.18, as shipped by FreeBSD<=12 and NetBSD<=9 will occasionally +# fail to find ssh host keys in the hostkey-rotate test. If we have those +# versions, use awk instead. +# See # https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258616 +# +case `grep --version 2>&1 | awk '/GNU grep/{print $4}'` in +2.19) fgrep=good ;; +1.*|2.?|2.?.?|2.1?) fgrep=bad ;; # stock GNU grep +2.5.1*) fgrep=bad ;; # FreeBSD and NetBSD +*) fgrep=good ;; +esac +if test "x$fgrep" = "xbad"; then + fgrep() +{ + awk 'BEGIN{e=1} {if (index($0,"'$1'")>0){e=0;print}} END{exit e}' $2 +} +fi + +rm -f $OBJ/hkr.* $OBJ/ssh_proxy.orig $OBJ/ssh_proxy.orig + +grep -vi 'hostkey' $OBJ/sshd_proxy > $OBJ/sshd_proxy.orig +mv $OBJ/ssh_proxy $OBJ/ssh_proxy.orig +grep -vi 'globalknownhostsfile' $OBJ/ssh_proxy.orig > $OBJ/ssh_proxy +echo "UpdateHostkeys=yes" >> $OBJ/ssh_proxy +echo "GlobalKnownHostsFile=none" >> $OBJ/ssh_proxy +rm $OBJ/known_hosts + +# The "primary" key type is ed25519 since it's supported even when built +# without OpenSSL. The secondary is RSA if it's supported. +primary="ssh-ed25519" +secondary="$primary" + +trace "prepare hostkeys" +nkeys=0 +all_algs="" +for k in $SSH_HOSTKEY_TYPES; do + ${SSHKEYGEN} -qt $k -f $OBJ/hkr.$k -N '' || fatal "ssh-keygen $k" + echo "Hostkey $OBJ/hkr.${k}" >> $OBJ/sshd_proxy.orig + nkeys=`expr $nkeys + 1` + test "x$all_algs" = "x" || all_algs="${all_algs}," + case "$k" in + ssh-rsa) + secondary="ssh-rsa" + all_algs="${all_algs}rsa-sha2-256,rsa-sha2-512,$k" + ;; + *) + all_algs="${all_algs}$k" + ;; + esac +done + +dossh() { + # All ssh should succeed in this test + ${SSH} -F $OBJ/ssh_proxy "$@" x true || fail "ssh $@ failed" +} + +expect_nkeys() { + _expected=$1 + _message=$2 + _n=`wc -l $OBJ/known_hosts | awk '{ print $1 }'` || fatal "wc failed" + [ "x$_n" = "x$_expected" ] || fail "$_message (got $_n wanted $_expected)" +} + +check_key_present() { + _type=$1 + _kfile=$2 + test "x$_kfile" = "x" && _kfile="$OBJ/hkr.${_type}.pub" + _kpub=`awk "/$_type /"' { print $2 }' < $_kfile` || \ + fatal "awk failed" + fgrep "$_kpub" $OBJ/known_hosts > /dev/null +} + +cp $OBJ/sshd_proxy.orig $OBJ/sshd_proxy + +# Connect to sshd with StrictHostkeyChecking=no +verbose "learn hostkey with StrictHostKeyChecking=no" +>$OBJ/known_hosts +dossh -oHostKeyAlgorithms=$primary -oStrictHostKeyChecking=no +# Verify no additional keys learned +expect_nkeys 1 "unstrict connect keys" +check_key_present $primary || fail "unstrict didn't learn key" + +# Connect to sshd as usual +verbose "learn additional hostkeys" +dossh -oStrictHostKeyChecking=yes -oHostKeyAlgorithms=$all_algs +# Check that other keys learned +expect_nkeys $nkeys "learn hostkeys" +for k in $SSH_HOSTKEY_TYPES; do + check_key_present $k || fail "didn't learn keytype $k" +done + +# Check each key type +for k in $SSH_HOSTKEY_TYPES; do + case "$k" in + ssh-rsa) alg="rsa-sha2-256,rsa-sha2-512,ssh-rsa" ;; + *) alg="$k" ;; + esac + verbose "learn additional hostkeys, type=$k" + dossh -oStrictHostKeyChecking=yes -oHostKeyAlgorithms=$alg,$all_algs + expect_nkeys $nkeys "learn hostkeys $k" + check_key_present $k || fail "didn't learn $k correctly" +done + +# Change one hostkey (non primary) and relearn +if [ "$primary" != "$secondary" ]; then + verbose "learn changed non-primary hostkey type=${secondary}" + mv $OBJ/hkr.${secondary}.pub $OBJ/hkr.${secondary}.pub.old + rm -f $OBJ/hkr.${secondary} + ${SSHKEYGEN} -qt ${secondary} -f $OBJ/hkr.${secondary} -N '' || \ + fatal "ssh-keygen $secondary" + dossh -oStrictHostKeyChecking=yes -oHostKeyAlgorithms=$all_algs + # Check that the key was replaced + expect_nkeys $nkeys "learn hostkeys" + check_key_present ${secondary} $OBJ/hkr.${secondary}.pub.old && \ + fail "old key present" + check_key_present ${secondary} || fail "didn't learn changed key" +fi + +# Add new hostkey (primary type) to sshd and connect +verbose "learn new primary hostkey" +${SSHKEYGEN} -qt ${primary} -f $OBJ/hkr.${primary}-new -N '' || fatal "ssh-keygen ed25519" +( cat $OBJ/sshd_proxy.orig ; echo HostKey $OBJ/hkr.${primary}-new ) \ + > $OBJ/sshd_proxy +# Check new hostkey added +dossh -oStrictHostKeyChecking=yes -oHostKeyAlgorithms=${primary},$all_algs +expect_nkeys `expr $nkeys + 1` "learn hostkeys" +check_key_present ${primary} || fail "current key missing" +check_key_present ${primary} $OBJ/hkr.${primary}-new.pub || fail "new key missing" + +# Remove old hostkey (primary type) from sshd +verbose "rotate primary hostkey" +cp $OBJ/sshd_proxy.orig $OBJ/sshd_proxy +mv $OBJ/hkr.${primary}.pub $OBJ/hkr.${primary}.pub.old +mv $OBJ/hkr.${primary}-new.pub $OBJ/hkr.${primary}.pub +mv $OBJ/hkr.${primary}-new $OBJ/hkr.${primary} +# Check old hostkey removed +dossh -oStrictHostKeyChecking=yes -oHostKeyAlgorithms=${primary},$all_algs +expect_nkeys $nkeys "learn hostkeys" +check_key_present ${primary} $OBJ/hkr.${primary}.pub.old && fail "old key present" +check_key_present ${primary} || fail "didn't learn changed key" + +# Connect again, forcing rotated key +verbose "check rotate primary hostkey" +dossh -oStrictHostKeyChecking=yes -oHostKeyAlgorithms=${primary} +expect_nkeys 1 "learn hostkeys" +check_key_present ${primary} || fail "didn't learn changed key" |