+# function to run command as monkeysphere user
+su_monkeysphere_user() {
+ # if the current user is the monkeysphere user, then just eval
+ # command
+ if [ $(id -un) = "$MONKEYSPHERE_USER" ] ; then
+ eval "$@"
+
+ # otherwise su command as monkeysphere user
+ else
+ su "$MONKEYSPHERE_USER" -c "$@"
+ fi
+}
+
+# function to interact with the host gnupg keyring
+gpg_host() {
+ local returnCode
+
+ GNUPGHOME="$GNUPGHOME_HOST"
+ export GNUPGHOME
+
+ # NOTE: we supress this warning because we need the monkeysphere
+ # user to be able to read the host pubring. we realize this might
+ # be problematic, but it's the simplest solution, without too much
+ # loss of security.
+ gpg --no-permission-warning "$@"
+ returnCode="$?"
+
+ # always reset the permissions on the host pubring so that the
+ # monkeysphere user can read the trust signatures
+ chgrp "$MONKEYSPHERE_USER" "${GNUPGHOME_HOST}/pubring.gpg"
+ chmod g+r "${GNUPGHOME_HOST}/pubring.gpg"
+
+ return "$returnCode"
+}
+
+# function to interact with the authentication gnupg keyring
+# FIXME: this function requires basically accepts only a single
+# argument because of problems with quote expansion. this needs to be
+# fixed/improved.
+gpg_authentication() {
+ GNUPGHOME="$GNUPGHOME_AUTHENTICATION"
+ export GNUPGHOME
+
+ su_monkeysphere_user "gpg $@"
+}
+
+# output just key fingerprint
+fingerprint_server_key() {
+ gpg_host --list-secret-keys --fingerprint \
+ --with-colons --fixed-list-mode 2> /dev/null | \
+ grep '^fpr:' | head -1 | cut -d: -f10
+}
+
+# output key information
+show_server_key() {
+ local fingerprint
+ local tmpkey
+
+ fingerprint=$(fingerprint_server_key)
+ gpg_authentication "--fingerprint --list-key --list-options show-unusable-uids $fingerprint"
+
+ # dumping to a file named ' ' so that the ssh-keygen output
+ # doesn't claim any potentially bogus hostname(s):
+ tmpkey=$(mktemp ${TMPDIR:-/tmp}/tmp.XXXXXXXXXX) || failure "Could not create temporary directory!"
+ gpg_authentication "--export $fingerprint" | openpgp2ssh "$fingerprint" 2>/dev/null > "$tmpkey"
+ echo -n "ssh fingerprint: "
+ ssh-keygen -l -f $tmpkey | awk '{ print $1, $2, $4 }'
+ rm -rf "$tmpkey"
+ echo -n "OpenPGP fingerprint: "
+ echo "$fingerprint"
+}
+
+# update authorized_keys for users
+update_users() {
+ if [ "$1" ] ; then
+ # get users from command line
+ unames="$@"
+ else
+ # or just look at all users if none specified
+ unames=$(getent passwd | cut -d: -f1)
+ fi
+
+ RETCODE=0
+
+ # set mode
+ MODE="authorized_keys"
+
+ # set gnupg home
+ GNUPGHOME="$GNUPGHOME_AUTHENTICATION"
+
+ # check to see if the gpg trust database has been initialized
+ if [ ! -s "${GNUPGHOME}/trustdb.gpg" ] ; then
+ failure "GNUPG trust database uninitialized. Please see MONKEYSPHERE-SERVER(8)."
+ fi
+
+ # make sure the authorized_keys directory exists
+ mkdir -p "${SYSDATADIR}/authorized_keys"
+
+ # loop over users
+ for uname in $unames ; do
+ # check all specified users exist
+ if ! id "$uname" >/dev/null ; then
+ log error "----- unknown user '$uname' -----"
+ continue
+ fi
+
+ log verbose "----- user: $uname -----"
+
+ # make temporary directory
+ TMPLOC=$(mktemp -d ${MSTMPDIR}/tmp.XXXXXXXXXX) || failure "Could not create temporary directory!"
+
+ # trap to delete temporary directory on exit
+ trap "rm -rf $TMPLOC" EXIT
+
+ # create temporary authorized_user_ids file
+ TMP_AUTHORIZED_USER_IDS="${TMPLOC}/authorized_user_ids"
+ touch "$TMP_AUTHORIZED_USER_IDS"
+
+ # create temporary authorized_keys file
+ AUTHORIZED_KEYS="${TMPLOC}/authorized_keys"
+ touch "$AUTHORIZED_KEYS"
+
+ # set restrictive permissions on the temporary files
+ # FIXME: is there a better way to do this?
+ chmod 0700 "$TMPLOC"
+ chmod 0600 "$AUTHORIZED_KEYS"
+ chmod 0600 "$TMP_AUTHORIZED_USER_IDS"
+ chown -R "$MONKEYSPHERE_USER" "$TMPLOC"
+
+ # process authorized_user_ids file
+ log debug "checking for authorized_user_ids..."
+ # translating ssh-style path variables
+ authorizedUserIDs=$(translate_ssh_variables "$uname" "$AUTHORIZED_USER_IDS")
+ if [ -s "$authorizedUserIDs" ] ; then
+ # check permissions on the authorized_user_ids file path
+ if check_key_file_permissions "$uname" "$authorizedUserIDs" ; then
+ # copy user authorized_user_ids file to temporary
+ # location
+ cat "$authorizedUserIDs" > "$TMP_AUTHORIZED_USER_IDS"
+
+ # export needed variables
+ export AUTHORIZED_KEYS
+ export TMP_AUTHORIZED_USER_IDS
+
+ # process authorized_user_ids file, as monkeysphere
+ # user
+ su_monkeysphere_user \
+ ". ${SYSSHAREDIR}/common; process_authorized_user_ids $TMP_AUTHORIZED_USER_IDS"
+ RETURN="$?"
+ else
+ log debug "not processing authorized_user_ids."
+ fi
+ else
+ log debug "empty or absent authorized_user_ids file."
+ fi
+
+ # add user-controlled authorized_keys file if specified
+ # translate ssh-style path variables
+ rawAuthorizedKeys=$(translate_ssh_variables "$uname" "$RAW_AUTHORIZED_KEYS")
+ if [ "$rawAuthorizedKeys" != 'none' ] ; then
+ log debug "checking for raw authorized_keys..."
+ if [ -s "$rawAuthorizedKeys" ] ; then
+ # check permissions on the authorized_keys file path
+ if check_key_file_permissions "$uname" "$rawAuthorizedKeys" ; then
+ log verbose "adding raw authorized_keys file... "
+ cat "$rawAuthorizedKeys" >> "$AUTHORIZED_KEYS"
+ else
+ log debug "not adding raw authorized_keys file."
+ fi
+ else
+ log debug "empty or absent authorized_keys file."
+ fi
+ fi
+
+ # move the new authorized_keys file into place
+ if [ -s "$AUTHORIZED_KEYS" ] ; then
+ # openssh appears to check the contents of the
+ # authorized_keys file as the user in question, so the
+ # file must be readable by that user at least.
+
+ # but in general, we don't want the user tampering with
+ # this file directly, so we'll adopt this approach: Own
+ # the file by the monkeysphere-server invoker (usually
+ # root, but should be the same uid that sshd is launched
+ # as); change the group of the file so that members of the
+ # user's group can read it.
+
+ # FIXME: is there a better way to do this?
+ chown $(whoami) "$AUTHORIZED_KEYS" && \
+ chgrp $(id -g "$uname") "$AUTHORIZED_KEYS" && \
+ chmod g+r "$AUTHORIZED_KEYS" && \
+ mv -f "$AUTHORIZED_KEYS" "${SYSDATADIR}/authorized_keys/${uname}" || \
+ {
+ log error "Failed to install authorized_keys for '$uname'!"
+ rm -f "${SYSDATADIR}/authorized_keys/${uname}"
+ # indicate that there has been a failure:
+ RETURN=1
+ }
+ else
+ rm -f "${SYSDATADIR}/authorized_keys/${uname}"
+ fi
+
+ # unset the trap
+ trap - EXIT
+
+ # destroy temporary directory
+ rm -rf "$TMPLOC"
+ done
+}
+