-#!/bin/sh -e
+#!/bin/bash
# monkeysphere-ssh-proxycommand: MonkeySphere ssh ProxyCommand hook
#
# established. Can be added to ~/.ssh/config as follows:
# ProxyCommand monkeysphere-ssh-proxycommand %h %p
+########################################################################
+
usage() {
cat <<EOF >&2
usage: ssh -o ProxyCommand="$(basename $0) %h %p" ...
EOF
}
-log() {
- echo "$@" >&2
-}
+########################################################################
+
+# export the monkeysphere log level
+export MONKEYSPHERE_LOG_LEVEL
if [ "$1" = '--no-connect' ] ; then
NO_CONNECT='true'
HOST="$1"
PORT="$2"
-MS_HOME=${MS_HOME:-"${HOME}/.config/monkeysphere"}
-
if [ -z "$HOST" ] ; then
- log "host must be specified."
+ echo "Host not specified." >&2
usage
- exit 1
+ exit 255
fi
if [ -z "$PORT" ] ; then
PORT=22
fi
# set the host URI
-URI="ssh://${HOST}"
if [ "$PORT" != '22' ] ; then
- URI="${URI}:${PORT}"
+ HOSTP="${HOST}:${PORT}"
+else
+ HOSTP="${HOST}"
fi
+URI="ssh://${HOSTP}"
+
+# specify keyserver checking. the behavior of this proxy command is
+# intentionally different than that of running monkeyesphere normally,
+# and keyserver checking is intentionally done under certain
+# circumstances. This can be overridden by setting the
+# MONKEYSPHERE_CHECK_KEYSERVER environment variable.
# if the host is in the gpg keyring...
if gpg --list-key ="${URI}" 2>&1 >/dev/null ; then
else
# if the host key is found in the known_hosts file...
# FIXME: this only works for default known_hosts location
- hostKey=$(ssh-keygen -F "$HOST")
+ hostKey=$(ssh-keygen -F "$HOST" 2>/dev/null)
+
if [ "$hostKey" ] ; then
# do not check the keyserver
# FIXME: more nuanced checking should be done here to properly
CHECK_KEYSERVER="true"
fi
fi
-export CHECK_KEYSERVER
+# set and export the variable for use by monkeysphere
+MONKEYSPHERE_CHECK_KEYSERVER=${MONKEYSPHERE_CHECK_KEYSERVER:="$CHECK_KEYSERVER"}
+export MONKEYSPHERE_CHECK_KEYSERVER
# update the known_hosts file for the host
-monkeysphere update-known_hosts "$HOST"
+monkeysphere update-known_hosts "$HOSTP"
# exec a netcat passthrough to host for the ssh connection
if [ -z "$NO_CONNECT" ] ; then
- exec nc "$HOST" "$PORT"
+ if (which nc 2>/dev/null >/dev/null); then
+ exec nc "$HOST" "$PORT"
+ elif (which socat 2>/dev/null >/dev/null); then
+ exec socat STDIO "TCP:$HOST:$PORT"
+ else
+ echo "Neither netcat nor socat found -- could not complete monkeysphere-ssh-proxycommand connection to $HOST:$PORT" >&2
+ exit 255
+ fi
fi