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# $OpenBSD: principals-command.sh,v 1.1 2015/05/21 06:44:25 djm Exp $
# Placed in the Public Domain.
tid="authorized principals command"
rm -f $OBJ/user_ca_key* $OBJ/cert_user_key*
cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak
if test -z "$SUDO" ; then
echo "skipped (SUDO not set)"
echo "need SUDO to create file in /var/run, test won't work without"
exit 0
fi
# Establish a AuthorizedPrincipalsCommand in /var/run where it will have
# acceptable directory permissions.
PRINCIPALS_CMD="/var/run/principals_command_${LOGNAME}"
cat << _EOF | $SUDO sh -c "cat > '$PRINCIPALS_CMD'"
#!/bin/sh
test "x\$1" != "x${LOGNAME}" && exit 1
test -f "$OBJ/authorized_principals_${LOGNAME}" &&
exec cat "$OBJ/authorized_principals_${LOGNAME}"
_EOF
test $? -eq 0 || fatal "couldn't prepare principals command"
$SUDO chmod 0755 "$PRINCIPALS_CMD"
# Create a CA key and a user certificate.
${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/user_ca_key || \
fatal "ssh-keygen of user_ca_key failed"
${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/cert_user_key || \
fatal "ssh-keygen of cert_user_key failed"
${SSHKEYGEN} -q -s $OBJ/user_ca_key -I "regress user key for $USER" \
-z $$ -n ${USER},mekmitasdigoat $OBJ/cert_user_key || \
fatal "couldn't sign cert_user_key"
if [ -x $PRINCIPALS_CMD ]; then
# Test explicitly-specified principals
for privsep in yes no ; do
_prefix="privsep $privsep"
# Setup for AuthorizedPrincipalsCommand
rm -f $OBJ/authorized_keys_$USER
(
cat $OBJ/sshd_proxy_bak
echo "UsePrivilegeSeparation $privsep"
echo "AuthorizedKeysFile none"
echo "AuthorizedPrincipalsCommand $PRINCIPALS_CMD %u"
echo "AuthorizedPrincipalsCommandUser ${LOGNAME}"
echo "TrustedUserCAKeys $OBJ/user_ca_key.pub"
) > $OBJ/sshd_proxy
# XXX test missing command
# XXX test failing command
# Empty authorized_principals
verbose "$tid: ${_prefix} empty authorized_principals"
echo > $OBJ/authorized_principals_$USER
${SSH} -2i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -eq 0 ]; then
fail "ssh cert connect succeeded unexpectedly"
fi
# Wrong authorized_principals
verbose "$tid: ${_prefix} wrong authorized_principals"
echo gregorsamsa > $OBJ/authorized_principals_$USER
${SSH} -2i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -eq 0 ]; then
fail "ssh cert connect succeeded unexpectedly"
fi
# Correct authorized_principals
verbose "$tid: ${_prefix} correct authorized_principals"
echo mekmitasdigoat > $OBJ/authorized_principals_$USER
${SSH} -2i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -ne 0 ]; then
fail "ssh cert connect failed"
fi
# authorized_principals with bad key option
verbose "$tid: ${_prefix} authorized_principals bad key opt"
echo 'blah mekmitasdigoat' > $OBJ/authorized_principals_$USER
${SSH} -2i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -eq 0 ]; then
fail "ssh cert connect succeeded unexpectedly"
fi
# authorized_principals with command=false
verbose "$tid: ${_prefix} authorized_principals command=false"
echo 'command="false" mekmitasdigoat' > \
$OBJ/authorized_principals_$USER
${SSH} -2i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -eq 0 ]; then
fail "ssh cert connect succeeded unexpectedly"
fi
# authorized_principals with command=true
verbose "$tid: ${_prefix} authorized_principals command=true"
echo 'command="true" mekmitasdigoat' > \
$OBJ/authorized_principals_$USER
${SSH} -2i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost false >/dev/null 2>&1
if [ $? -ne 0 ]; then
fail "ssh cert connect failed"
fi
# Setup for principals= key option
rm -f $OBJ/authorized_principals_$USER
(
cat $OBJ/sshd_proxy_bak
echo "UsePrivilegeSeparation $privsep"
) > $OBJ/sshd_proxy
# Wrong principals list
verbose "$tid: ${_prefix} wrong principals key option"
(
printf 'cert-authority,principals="gregorsamsa" '
cat $OBJ/user_ca_key.pub
) > $OBJ/authorized_keys_$USER
${SSH} -2i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -eq 0 ]; then
fail "ssh cert connect succeeded unexpectedly"
fi
# Correct principals list
verbose "$tid: ${_prefix} correct principals key option"
(
printf 'cert-authority,principals="mekmitasdigoat" '
cat $OBJ/user_ca_key.pub
) > $OBJ/authorized_keys_$USER
${SSH} -2i $OBJ/cert_user_key \
-F $OBJ/ssh_proxy somehost true >/dev/null 2>&1
if [ $? -ne 0 ]; then
fail "ssh cert connect failed"
fi
done
else
echo "SKIPPED: $PRINCIPALS_COMMAND not executable " \
"(/var/run mounted noexec?)"
fi
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