332 lines
11 KiB
Bash
332 lines
11 KiB
Bash
# $OpenBSD: cert-hostkey.sh,v 1.25 2021/06/08 22:30:27 djm Exp $
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# Placed in the Public Domain.
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tid="certified host keys"
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rm -f $OBJ/known_hosts-cert* $OBJ/host_ca_key* $OBJ/host_revoked_*
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rm -f $OBJ/cert_host_key* $OBJ/host_krl_*
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# Allow all hostkey/pubkey types, prefer certs for the client
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rsa=0
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types=""
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for i in `$SSH -Q key | maybe_filter_sk`; do
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if [ -z "$types" ]; then
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types="$i"
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continue
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fi
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case "$i" in
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# Special treatment for RSA keys.
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*rsa*cert*)
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types="rsa-sha2-256-cert-v01@openssh.com,$i,$types"
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types="rsa-sha2-512-cert-v01@openssh.com,$types";;
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*rsa*)
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rsa=1
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types="$types,rsa-sha2-512,rsa-sha2-256,$i";;
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# Prefer certificate to plain keys.
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*cert*) types="$i,$types";;
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*) types="$types,$i";;
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esac
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done
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(
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echo "HostKeyAlgorithms ${types}"
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echo "PubkeyAcceptedAlgorithms *"
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) >> $OBJ/ssh_proxy
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cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak
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(
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echo "HostKeyAlgorithms *"
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echo "PubkeyAcceptedAlgorithms *"
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) >> $OBJ/sshd_proxy_bak
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HOSTS='localhost-with-alias,127.0.0.1,::1'
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kh_ca() {
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for k in "$@" ; do
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printf "@cert-authority $HOSTS "
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cat $OBJ/$k || fatal "couldn't cat $k"
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done
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}
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kh_revoke() {
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for k in "$@" ; do
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printf "@revoked * "
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cat $OBJ/$k || fatal "couldn't cat $k"
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done
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}
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# Create a CA key and add it to known hosts. Ed25519 chosen for speed.
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# RSA for testing RSA/SHA2 signatures if supported.
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ktype2=ed25519
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[ "x$rsa" = "x1" ] && ktype2=rsa
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${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/host_ca_key ||\
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fail "ssh-keygen of host_ca_key failed"
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${SSHKEYGEN} -q -N '' -t $ktype2 -f $OBJ/host_ca_key2 ||\
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fail "ssh-keygen of host_ca_key failed"
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kh_ca host_ca_key.pub host_ca_key2.pub > $OBJ/known_hosts-cert.orig
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cp $OBJ/known_hosts-cert.orig $OBJ/known_hosts-cert
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# Plain text revocation files
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touch $OBJ/host_revoked_empty
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touch $OBJ/host_revoked_plain
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touch $OBJ/host_revoked_cert
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cat $OBJ/host_ca_key.pub $OBJ/host_ca_key2.pub > $OBJ/host_revoked_ca
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PLAIN_TYPES=`echo "$SSH_KEYTYPES" | sed 's/^ssh-dss/ssh-dsa/g;s/^ssh-//'`
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if echo "$PLAIN_TYPES" | grep '^rsa$' >/dev/null 2>&1 ; then
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PLAIN_TYPES="$PLAIN_TYPES rsa-sha2-256 rsa-sha2-512"
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fi
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# Prepare certificate, plain key and CA KRLs
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${SSHKEYGEN} -kf $OBJ/host_krl_empty || fatal "KRL init failed"
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${SSHKEYGEN} -kf $OBJ/host_krl_plain || fatal "KRL init failed"
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${SSHKEYGEN} -kf $OBJ/host_krl_cert || fatal "KRL init failed"
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${SSHKEYGEN} -kf $OBJ/host_krl_ca $OBJ/host_ca_key.pub $OBJ/host_ca_key2.pub \
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|| fatal "KRL init failed"
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# Generate and sign host keys
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serial=1
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for ktype in $PLAIN_TYPES ; do
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verbose "$tid: sign host ${ktype} cert"
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# Generate and sign a host key
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${SSHKEYGEN} -q -N '' -t ${ktype} \
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-f $OBJ/cert_host_key_${ktype} || \
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fatal "ssh-keygen of cert_host_key_${ktype} failed"
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${SSHKEYGEN} -ukf $OBJ/host_krl_plain \
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$OBJ/cert_host_key_${ktype}.pub || fatal "KRL update failed"
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cat $OBJ/cert_host_key_${ktype}.pub >> $OBJ/host_revoked_plain
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case $ktype in
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rsa-sha2-*) tflag="-t $ktype"; ca="$OBJ/host_ca_key2" ;;
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*) tflag=""; ca="$OBJ/host_ca_key" ;;
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esac
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${SSHKEYGEN} -h -q -s $ca -z $serial $tflag \
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-I "regress host key for $USER" \
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-n $HOSTS $OBJ/cert_host_key_${ktype} ||
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fatal "couldn't sign cert_host_key_${ktype}"
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${SSHKEYGEN} -ukf $OBJ/host_krl_cert \
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$OBJ/cert_host_key_${ktype}-cert.pub || \
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fatal "KRL update failed"
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cat $OBJ/cert_host_key_${ktype}-cert.pub >> $OBJ/host_revoked_cert
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serial=`expr $serial + 1`
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done
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attempt_connect() {
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_ident="$1"
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_expect_success="$2"
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shift; shift
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verbose "$tid: $_ident expect success $_expect_success"
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cp $OBJ/known_hosts-cert.orig $OBJ/known_hosts-cert
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${SSH} -oUserKnownHostsFile=$OBJ/known_hosts-cert \
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-oGlobalKnownHostsFile=$OBJ/known_hosts-cert \
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"$@" -F $OBJ/ssh_proxy somehost true
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_r=$?
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if [ "x$_expect_success" = "xyes" ] ; then
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if [ $_r -ne 0 ]; then
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fail "ssh cert connect $_ident failed"
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fi
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else
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if [ $_r -eq 0 ]; then
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fail "ssh cert connect $_ident succeeded unexpectedly"
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fi
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fi
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}
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# Basic connect and revocation tests.
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for privsep in yes ; do
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for ktype in $PLAIN_TYPES ; do
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verbose "$tid: host ${ktype} cert connect privsep $privsep"
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(
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cat $OBJ/sshd_proxy_bak
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echo HostKey $OBJ/cert_host_key_${ktype}
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echo HostCertificate $OBJ/cert_host_key_${ktype}-cert.pub
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echo UsePrivilegeSeparation $privsep
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) > $OBJ/sshd_proxy
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# test name expect success
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attempt_connect "$ktype basic connect" "yes"
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attempt_connect "$ktype empty KRL" "yes" \
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-oRevokedHostKeys=$OBJ/host_krl_empty
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attempt_connect "$ktype KRL w/ plain key revoked" "no" \
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-oRevokedHostKeys=$OBJ/host_krl_plain
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attempt_connect "$ktype KRL w/ cert revoked" "no" \
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-oRevokedHostKeys=$OBJ/host_krl_cert
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attempt_connect "$ktype KRL w/ CA revoked" "no" \
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-oRevokedHostKeys=$OBJ/host_krl_ca
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attempt_connect "$ktype empty plaintext revocation" "yes" \
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-oRevokedHostKeys=$OBJ/host_revoked_empty
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attempt_connect "$ktype plain key plaintext revocation" "no" \
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-oRevokedHostKeys=$OBJ/host_revoked_plain
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attempt_connect "$ktype cert plaintext revocation" "no" \
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-oRevokedHostKeys=$OBJ/host_revoked_cert
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attempt_connect "$ktype CA plaintext revocation" "no" \
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-oRevokedHostKeys=$OBJ/host_revoked_ca
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done
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done
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# Revoked certificates with key present
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kh_ca host_ca_key.pub host_ca_key2.pub > $OBJ/known_hosts-cert.orig
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for ktype in $PLAIN_TYPES ; do
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test -f "$OBJ/cert_host_key_${ktype}.pub" || fatal "no pubkey"
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kh_revoke cert_host_key_${ktype}.pub >> $OBJ/known_hosts-cert.orig
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done
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cp $OBJ/known_hosts-cert.orig $OBJ/known_hosts-cert
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for privsep in yes ; do
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for ktype in $PLAIN_TYPES ; do
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verbose "$tid: host ${ktype} revoked cert privsep $privsep"
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(
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cat $OBJ/sshd_proxy_bak
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echo HostKey $OBJ/cert_host_key_${ktype}
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echo HostCertificate $OBJ/cert_host_key_${ktype}-cert.pub
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echo UsePrivilegeSeparation $privsep
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) > $OBJ/sshd_proxy
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cp $OBJ/known_hosts-cert.orig $OBJ/known_hosts-cert
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${SSH} -oUserKnownHostsFile=$OBJ/known_hosts-cert \
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-oGlobalKnownHostsFile=$OBJ/known_hosts-cert \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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fail "ssh cert connect succeeded unexpectedly"
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fi
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done
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done
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# Revoked CA
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kh_ca host_ca_key.pub host_ca_key2.pub > $OBJ/known_hosts-cert.orig
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kh_revoke host_ca_key.pub host_ca_key2.pub >> $OBJ/known_hosts-cert.orig
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cp $OBJ/known_hosts-cert.orig $OBJ/known_hosts-cert
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for ktype in $PLAIN_TYPES ; do
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verbose "$tid: host ${ktype} revoked cert"
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(
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cat $OBJ/sshd_proxy_bak
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echo HostKey $OBJ/cert_host_key_${ktype}
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echo HostCertificate $OBJ/cert_host_key_${ktype}-cert.pub
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) > $OBJ/sshd_proxy
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cp $OBJ/known_hosts-cert.orig $OBJ/known_hosts-cert
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${SSH} -oUserKnownHostsFile=$OBJ/known_hosts-cert \
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-oGlobalKnownHostsFile=$OBJ/known_hosts-cert \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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fail "ssh cert connect succeeded unexpectedly"
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fi
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done
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# Create a CA key and add it to known hosts
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kh_ca host_ca_key.pub host_ca_key2.pub > $OBJ/known_hosts-cert.orig
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cp $OBJ/known_hosts-cert.orig $OBJ/known_hosts-cert
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test_one() {
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ident=$1
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result=$2
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sign_opts=$3
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for kt in $PLAIN_TYPES; do
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case $ktype in
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rsa-sha2-*) tflag="-t $ktype"; ca="$OBJ/host_ca_key2" ;;
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*) tflag=""; ca="$OBJ/host_ca_key" ;;
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esac
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${SSHKEYGEN} -q -s $ca $tflag -I "regress host key for $USER" \
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$sign_opts $OBJ/cert_host_key_${kt} ||
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fatal "couldn't sign cert_host_key_${kt}"
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(
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cat $OBJ/sshd_proxy_bak
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echo HostKey $OBJ/cert_host_key_${kt}
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echo HostCertificate $OBJ/cert_host_key_${kt}-cert.pub
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) > $OBJ/sshd_proxy
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cp $OBJ/known_hosts-cert.orig $OBJ/known_hosts-cert
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${SSH} -oUserKnownHostsFile=$OBJ/known_hosts-cert \
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-oGlobalKnownHostsFile=$OBJ/known_hosts-cert \
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-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
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rc=$?
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if [ "x$result" = "xsuccess" ] ; then
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if [ $rc -ne 0 ]; then
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fail "ssh cert connect $ident failed unexpectedly"
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fi
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else
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if [ $rc -eq 0 ]; then
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fail "ssh cert connect $ident succeeded unexpectedly"
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fi
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fi
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done
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}
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test_one "user-certificate" failure "-n $HOSTS"
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test_one "empty principals" success "-h"
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test_one "wrong principals" failure "-h -n foo"
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test_one "cert not yet valid" failure "-h -V20300101:20320101"
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test_one "cert expired" failure "-h -V19800101:19900101"
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test_one "cert valid interval" success "-h -V-1w:+2w"
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test_one "cert has constraints" failure "-h -Oforce-command=false"
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# Check downgrade of cert to raw key when no CA found
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for ktype in $PLAIN_TYPES ; do
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rm -f $OBJ/known_hosts-cert $OBJ/cert_host_key*
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verbose "$tid: host ${ktype} ${v} cert downgrade to raw key"
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# Generate and sign a host key
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${SSHKEYGEN} -q -N '' -t ${ktype} -f $OBJ/cert_host_key_${ktype} || \
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fail "ssh-keygen of cert_host_key_${ktype} failed"
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case $ktype in
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rsa-sha2-*) tflag="-t $ktype"; ca="$OBJ/host_ca_key2" ;;
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*) tflag=""; ca="$OBJ/host_ca_key" ;;
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esac
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${SSHKEYGEN} -h -q $tflag -s $ca $tflag \
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-I "regress host key for $USER" \
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-n $HOSTS $OBJ/cert_host_key_${ktype} ||
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fatal "couldn't sign cert_host_key_${ktype}"
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(
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printf "$HOSTS "
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cat $OBJ/cert_host_key_${ktype}.pub
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) > $OBJ/known_hosts-cert
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(
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cat $OBJ/sshd_proxy_bak
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echo HostKey $OBJ/cert_host_key_${ktype}
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echo HostCertificate $OBJ/cert_host_key_${ktype}-cert.pub
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) > $OBJ/sshd_proxy
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${SSH} -oUserKnownHostsFile=$OBJ/known_hosts-cert \
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-oGlobalKnownHostsFile=none -F $OBJ/ssh_proxy somehost true
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if [ $? -ne 0 ]; then
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fail "ssh cert connect failed"
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fi
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# Also check that it works when the known_hosts file is not in the
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# first array position.
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${SSH} -oUserKnownHostsFile="/dev/null $OBJ/known_hosts-cert" \
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-oGlobalKnownHostsFile=none -F $OBJ/ssh_proxy somehost true
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if [ $? -ne 0 ]; then
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fail "ssh cert connect failed known_hosts 2nd"
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fi
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done
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# Wrong certificate
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kh_ca host_ca_key.pub host_ca_key2.pub > $OBJ/known_hosts-cert.orig
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cp $OBJ/known_hosts-cert.orig $OBJ/known_hosts-cert
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for kt in $PLAIN_TYPES ; do
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verbose "$tid: host ${kt} connect wrong cert"
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rm -f $OBJ/cert_host_key*
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# Self-sign key
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${SSHKEYGEN} -q -N '' -t ${kt} -f $OBJ/cert_host_key_${kt} || \
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fail "ssh-keygen of cert_host_key_${kt} failed"
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case $kt in
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rsa-sha2-*) tflag="-t $kt" ;;
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*) tflag="" ;;
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esac
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${SSHKEYGEN} $tflag -h -q -s $OBJ/cert_host_key_${kt} \
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-I "regress host key for $USER" \
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-n $HOSTS $OBJ/cert_host_key_${kt} ||
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fatal "couldn't sign cert_host_key_${kt}"
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(
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cat $OBJ/sshd_proxy_bak
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echo HostKey $OBJ/cert_host_key_${kt}
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echo HostCertificate $OBJ/cert_host_key_${kt}-cert.pub
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) > $OBJ/sshd_proxy
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cp $OBJ/known_hosts-cert.orig $OBJ/known_hosts-cert
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${SSH} -oUserKnownHostsFile=$OBJ/known_hosts-cert \
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-oGlobalKnownHostsFile=$OBJ/known_hosts-cert \
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-F $OBJ/ssh_proxy -q somehost true >/dev/null 2>&1
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if [ $? -eq 0 ]; then
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fail "ssh cert connect $ident succeeded unexpectedly"
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fi
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done
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rm -f $OBJ/known_hosts-cert* $OBJ/host_ca_key* $OBJ/cert_host_key*
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