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+#!/bin/bash
+
+# monkeysphere-server: MonkeySphere server admin tool
+#
+# The monkeysphere scripts are written by:
+# Jameson Rollins <jrollins@fifthhorseman.net>
+#
+# They are Copyright 2008, and are all released under the GPL, version 3
+# or later.
+
+########################################################################
+PGRM=$(basename $0)
+
+SHAREDIR=${SHAREDIR:-"/usr/share/monkeysphere"}
+export SHAREDIR
+. "${SHAREDIR}/common"
+
+# date in UTF format if needed
+DATE=$(date -u '+%FT%T')
+
+# unset some environment variables that could screw things up
+GREP_OPTIONS=
+
+########################################################################
+# FUNCTIONS
+########################################################################
+
+usage() {
+cat <<EOF
+usage: $PGRM <subcommand> [args]
+MonkeySphere server admin tool.
+
+subcommands:
+ update-users (s) [USER]... update users authorized_keys files
+ gen-key (g) [HOSTNAME] generate gpg key for the server
+ show-fingerprint (f) show server's host key fingerprint
+ publish-key (p) publish server key to keyserver
+ trust-keys (t) KEYID... mark keyids as trusted
+ help (h,?) this help
+
+EOF
+}
+
+# generate server gpg key
+gen_key() {
+ local hostName
+
+ hostName=${1:-$(hostname --fqdn)}
+ service=${SERVICE:-"ssh"}
+ userID="${service}://${hostName}"
+
+ if gpg --list-key ="$userID" > /dev/null 2>&1 ; then
+ failure "Key for '$userID' already exists"
+ fi
+
+ # set key defaults
+ KEY_TYPE=${KEY_TYPE:-"RSA"}
+ KEY_LENGTH=${KEY_LENGTH:-"2048"}
+ KEY_USAGE=${KEY_USAGE:-"auth"}
+ KEY_EXPIRE=${KEY_EXPIRE:-"0"}
+ cat <<EOF
+Please specify how long the key should be valid.
+ 0 = key does not expire
+ <n> = key expires in n days
+ <n>w = key expires in n weeks
+ <n>m = key expires in n months
+ <n>y = key expires in n years
+EOF
+ read -p "Key is valid for? ($KEY_EXPIRE) " KEY_EXPIRE; KEY_EXPIRE=${KEY_EXPIRE:-"0"}
+
+ # set key parameters
+ keyParameters=$(cat <<EOF
+Key-Type: $KEY_TYPE
+Key-Length: $KEY_LENGTH
+Key-Usage: $KEY_USAGE
+Name-Real: $userID
+Expire-Date: $KEY_EXPIRE
+EOF
+)
+
+ # add the revoker field if requested
+ # FIXME: the "1:" below assumes that $REVOKER's key is an RSA key. why?
+ # FIXME: why is this marked "sensitive"? how will this signature ever
+ # be transmitted to the expected revoker?
+ if [ "$REVOKER" ] ; then
+ keyParameters="${keyParameters}"$(cat <<EOF
+
+Revoker: 1:$REVOKER sensitive
+EOF
+)
+ fi
+
+ echo "The following key parameters will be used:"
+ echo "$keyParameters"
+
+ read -p "Generate key? [Y|n]: " OK; OK=${OK:=Y}
+ if [ ${OK/y/Y} != 'Y' ] ; then
+ failure "aborting."
+ fi
+
+ # add commit command
+ keyParameters="${keyParameters}"$(cat <<EOF
+
+%commit
+%echo done
+EOF
+)
+
+ log "generating server key... "
+ echo "$keyParameters" | gpg --batch --gen-key
+
+ # output the server fingerprint
+ fingerprint_server_key "=${userID}"
+
+ # find the key fingerprint of the server primary key
+ keyID=$(gpg --list-key --with-colons --with-fingerprint "=${userID}" | \
+ grep '^fpr:' | head -1 | cut -d: -f10)
+
+ # write the key to the file
+ # NOTE: assumes that the primary key is the proper key to use
+ (umask 077 && gpgsecret2ssh "$keyID" > "${MS_HOME}/ssh_host_rsa_key")
+ log "Private SSH host key output to file: ${MS_HOME}/ssh_host_rsa_key"
+}
+
+# gpg output key fingerprint
+fingerprint_server_key() {
+ local ID
+
+ if [ -z "$1" ] ; then
+ ID="$1"
+ else
+ ID="=ssh://$(hostname --fqdn)"
+ fi
+
+ gpg --fingerprint --list-secret-keys "$ID"
+}
+
+########################################################################
+# MAIN
+########################################################################
+
+COMMAND="$1"
+[ "$COMMAND" ] || failure "Type '$PGRM help' for usage."
+shift
+
+# set ms home directory
+MS_HOME=${MS_HOME:-"$ETC"}
+
+# load configuration file
+MS_CONF=${MS_CONF:-"$MS_HOME"/monkeysphere-server.conf}
+[ -e "$MS_CONF" ] && . "$MS_CONF"
+
+# set empty config variable with defaults
+GNUPGHOME=${GNUPGHOME:-"${MS_HOME}/gnupg"}
+KEYSERVER=${KEYSERVER:-"subkeys.pgp.net"}
+CHECK_KEYSERVER=${CHECK_KEYSERVER:="true"}
+REQUIRED_USER_KEY_CAPABILITY=${REQUIRED_USER_KEY_CAPABILITY:-"a"}
+AUTHORIZED_USER_IDS=${AUTHORIZED_USER_IDS:-"%h/.config/monkeysphere/authorized_user_ids"}
+USER_CONTROLLED_AUTHORIZED_KEYS=${USER_CONTROLLED_AUTHORIZED_KEYS:-"%h/.ssh/authorized_keys"}
+
+export GNUPGHOME
+
+# make sure the monkeysphere home directory exists
+mkdir -p "${MS_HOME}/authorized_user_ids"
+# make sure gpg home exists with proper permissions
+mkdir -p -m 0700 "$GNUPGHOME"
+# make sure the authorized_keys directory exists
+mkdir -p "${CACHE}/authorized_keys"
+
+case $COMMAND in
+ 'update-users'|'update-user'|'s')
+ 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
+
+ # loop over users
+ for uname in $unames ; do
+ MODE="authorized_keys"
+
+ # check all specified users exist
+ if ! getent passwd "$uname" >/dev/null ; then
+ error "----- unknown user '$uname' -----"
+ continue
+ fi
+
+ # set authorized_user_ids variable,
+ # translate ssh-style path variables
+ authorizedUserIDs=$(translate_ssh_variables "$uname" "$AUTHORIZED_USER_IDS")
+
+ # skip user if authorized_user_ids file does not exist
+ if [ ! -f "$authorizedUserIDs" ] ; then
+ continue
+ fi
+
+ log "----- user: $uname -----"
+
+ # temporary authorized_keys file
+ AUTHORIZED_KEYS=$(mktemp)
+
+ # skip if the user's authorized_user_ids file is empty
+ if [ ! -s "$authorizedUserIDs" ] ; then
+ log "authorized_user_ids file '$authorizedUserIDs' is empty."
+ continue
+ fi
+
+ # process authorized_user_ids file
+ log "processing authorized_user_ids file..."
+ process_authorized_user_ids "$authorizedUserIDs"
+
+ # add user-controlled authorized_keys file path if specified
+ if [ "$USER_CONTROLLED_AUTHORIZED_KEYS" != '-' ] ; then
+ userAuthorizedKeys=$(translate_ssh_variables "$uname" "$USER_CONTROLLED_AUTHORIZED_KEYS")
+ if [ -f "$userAuthorizedKeys" ] ; then
+ log -n "adding user's authorized_keys file... "
+ cat "$userAuthorizedKeys" >> "$AUTHORIZED_KEYS"
+ loge "done."
+ fi
+ fi
+
+ # move the temp authorized_keys file into place
+ mv -f "$AUTHORIZED_KEYS" "${CACHE}/authorized_keys/${uname}"
+
+ log "authorized_keys file updated."
+ done
+ ;;
+
+ 'gen-key'|'g')
+ gen_key "$1"
+ ;;
+
+ 'show-fingerprint'|'f')
+ fingerprint_server_key "$@"
+ ;;
+
+ 'publish-key'|'p')
+ publish_server_key
+ ;;
+
+ 'trust-keys'|'trust-key'|'t')
+ if [ -z "$1" ] ; then
+ failure "You must specify at least one key to trust."
+ fi
+
+ # process key IDs
+ for keyID ; do
+ trust_key "$keyID"
+ done
+ ;;
+
+ 'help'|'h'|'?')
+ usage
+ ;;
+
+ *)
+ failure "Unknown command: '$COMMAND'
+Type '$PGRM help' for usage."
+ ;;
+esac
+
+exit "$ERR"
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