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Diffstat (limited to '')
| -rw-r--r-- | regress/keys-command.sh | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/regress/keys-command.sh b/regress/keys-command.sh new file mode 100644 index 0000000..33b6e7b --- /dev/null +++ b/regress/keys-command.sh @@ -0,0 +1,81 @@ +# $OpenBSD: keys-command.sh,v 1.6 2019/07/25 08:48:11 dtucker Exp $ +# Placed in the Public Domain. + +tid="authorized keys from command" + +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 + +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 + echo "SKIPPED: $KEY_COMMAND not executable (/var/run mounted noexec?)" +fi |