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# $OpenBSD: principals-command.sh,v 1.4 2017/04/30 23:34:55 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 $OBJ/sshd_proxy_bak
if [ -z "$SUDO" -a ! -w /var/run ]; then
echo "skipped (SUDO not set)"
echo "need SUDO to create file in /var/run, test won't work without"
exit 0
fi
SERIAL=$$
# Create a CA key and a user certificate.
${SSHKEYGEN} -q -N '' -t ed25519 -f $OBJ/user_ca_key || \
fatal "ssh-keygen of user_ca_key failed"
${SSHKEYGEN} -q -N '' -t rsa -f $OBJ/cert_user_key || \
fatal "ssh-keygen of cert_user_key failed"
${SSHKEYGEN} -q -s $OBJ/user_ca_key -I "Joanne User" \
-z $$ -n ${USER},mekmitasdigoat $OBJ/cert_user_key || \
fatal "couldn't sign cert_user_key"
CERT_BODY=`cat $OBJ/cert_user_key-cert.pub | awk '{ print $2 }'`
CA_BODY=`cat $OBJ/user_ca_key.pub | awk '{ print $2 }'`
CERT_FP=`${SSHKEYGEN} -lf $OBJ/cert_user_key-cert.pub | awk '{ print $2 }'`
CA_FP=`${SSHKEYGEN} -lf $OBJ/user_ca_key.pub | awk '{ print $2 }'`
# Establish a AuthorizedPrincipalsCommand in /var/run where it will have
# acceptable directory permissions.
PRINCIPALS_COMMAND="/var/run/principals_command_${LOGNAME}"
cat << _EOF | $SUDO sh -c "cat > '$PRINCIPALS_COMMAND'"
#!/bin/sh
test "x\$1" != "x${LOGNAME}" && exit 1
test "x\$2" != "xssh-rsa-cert-v01@openssh.com" && exit 1
test "x\$3" != "xssh-ed25519" && exit 1
test "x\$4" != "xJoanne User" && exit 1
test "x\$5" != "x${SERIAL}" && exit 1
test "x\$6" != "x${CA_FP}" && exit 1
test "x\$7" != "x${CERT_FP}" && exit 1
test "x\$8" != "x${CERT_BODY}" && exit 1
test "x\$9" != "x${CA_BODY}" && 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_COMMAND"
if ! $OBJ/check-perm -m keys-command $PRINCIPALS_COMMAND ; then
echo "skipping: $PRINCIPALS_COMMAND is unsuitable as " \
"AuthorizedPrincipalsCommand"
$SUDO rm -f $PRINCIPALS_COMMAND
exit 0
fi
if [ -x $PRINCIPALS_COMMAND ]; 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_COMMAND" \
"%u %t %T %i %s %F %f %k %K"
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} -i $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} -i $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} -i $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} -i $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} -i $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} -i $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} -i $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} -i $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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