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# $OpenBSD: keys-command.sh,v 1.8 2021/09/30 04:22:50 dtucker Exp $
# Placed in the Public Domain.
tid="authorized keys from command"
if [ -z "$SUDO" -a ! -w /var/run ]; then
skip "need SUDO to create file in /var/run, test won't work without"
fi
rm -f $OBJ/keys-command-args
touch $OBJ/keys-command-args
chmod a+rw $OBJ/keys-command-args
expected_key_text=`awk '{ print $2 }' < $OBJ/ssh-ed25519.pub`
expected_key_fp=`$SSHKEYGEN -lf $OBJ/ssh-ed25519.pub | awk '{ print $2 }'`
# Establish a AuthorizedKeysCommand in /var/run where it will have
# acceptable directory permissions.
KEY_COMMAND="/var/run/keycommand_${LOGNAME}.$$"
trap "${SUDO} rm -f ${KEY_COMMAND}" 0
cat << _EOF | $SUDO sh -c "rm -f '$KEY_COMMAND' ; cat > '$KEY_COMMAND'"
#!/bin/sh
echo args: "\$@" >> $OBJ/keys-command-args
echo "$PATH" | grep -q mekmitasdigoat && exit 7
test "x\$1" != "x${LOGNAME}" && exit 1
if test $# -eq 6 ; then
test "x\$2" != "xblah" && exit 2
test "x\$3" != "x${expected_key_text}" && exit 3
test "x\$4" != "xssh-rsa" && exit 4
test "x\$5" != "x${expected_key_fp}" && exit 5
test "x\$6" != "xblah" && exit 6
fi
exec cat "$OBJ/authorized_keys_${LOGNAME}"
_EOF
$SUDO chmod 0755 "$KEY_COMMAND"
if ! $OBJ/check-perm -m keys-command $KEY_COMMAND ; then
echo "skipping: $KEY_COMMAND is unsuitable as AuthorizedKeysCommand"
$SUDO rm -f $KEY_COMMAND
exit 0
fi
if [ -x $KEY_COMMAND ]; then
cp $OBJ/sshd_proxy $OBJ/sshd_proxy.bak
verbose "AuthorizedKeysCommand with arguments"
(
grep -vi AuthorizedKeysFile $OBJ/sshd_proxy.bak
echo AuthorizedKeysFile none
echo AuthorizedKeysCommand $KEY_COMMAND %u blah %k %t %f blah
echo AuthorizedKeysCommandUser ${LOGNAME}
) > $OBJ/sshd_proxy
# Ensure that $PATH is sanitised in sshd
env PATH=$PATH:/sbin/mekmitasdigoat \
${SSH} -F $OBJ/ssh_proxy somehost true
if [ $? -ne 0 ]; then
fail "connect failed"
fi
verbose "AuthorizedKeysCommand without arguments"
# Check legacy behavior of no-args resulting in username being passed.
(
grep -vi AuthorizedKeysFile $OBJ/sshd_proxy.bak
echo AuthorizedKeysFile none
echo AuthorizedKeysCommand $KEY_COMMAND
echo AuthorizedKeysCommandUser ${LOGNAME}
) > $OBJ/sshd_proxy
# Ensure that $PATH is sanitised in sshd
env PATH=$PATH:/sbin/mekmitasdigoat \
${SSH} -F $OBJ/ssh_proxy somehost true
if [ $? -ne 0 ]; then
fail "connect failed"
fi
else
skip "$KEY_COMMAND not executable (/var/run mounted noexec?)"
fi
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