#!/bin/bash # monkeysphere: MonkeySphere client 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 $0) SHARE=${MONKEYSPHERE_SHARE:-"/usr/share/monkeysphere"} export SHARE . "${SHARE}/common" || exit 1 # date in UTF format if needed DATE=$(date -u '+%FT%T') # unset some environment variables that could screw things up unset GREP_OPTIONS # default return code RETURN=0 ######################################################################## # FUNCTIONS ######################################################################## usage() { cat <<EOF usage: $PGRM <subcommand> [options] [args] MonkeySphere client tool. subcommands: update-known_hosts (k) [HOST]... update known_hosts file update-authorized_keys (a) update authorized_keys file gen-subkey (g) KEYID generate an 'a' capable subkey -l|--length BITS key length in bits (2048) -e|--expire EXPIRE date to expire help (h,?) this help EOF } # generate a subkey with the 'a' usage flags set # FIXME: this needs some tweaking to clean it up gen_subkey(){ local keyID local gpgOut local userID keyID="$1" gpgOut=$(gpg --quiet --fixed-list-mode --list-keys --with-colons \ "$keyID" 2> /dev/null) # fail if there only "tru" lines are output from gpg, which # indicates the key was not found. if [ -z "$(echo "$gpgOut" | grep -v '^tru:')" ] ; then failure "Key ID '$keyID' not found." fi # fail if multiple pub lines are returned, which means the id given # is not unique if [ $(echo "$gpgOut" | grep '^pub:' | wc -l) -gt '1' ] ; then failure "Key ID '$keyID' is not unique." fi # prompt if an authentication subkey already exists if echo "$gpgOut" | egrep "^(pub|sub):" | cut -d: -f 12 | grep -q a ; then echo "An authentication subkey already exists for key '$keyID'." read -p "Are you sure you would like to generate another one? (y/N) " OK; OK=${OK:N} if [ "${OK/y/Y}" != 'Y' ] ; then failure "aborting." fi fi # set subkey defaults KEY_TYPE="RSA" KEY_LENGTH=${KEY_LENGTH:-} KEY_USAGE="auth" # prompt about key expiration if not specified if [ -z "$KEY_EXPIRE" ] ; then cat <<EOF Please specify how long the key should be valid. 0 = key does not expire <n> = key expires in n days <n>w = key expires in n weeks <n>m = key expires in n months <n>y = key expires in n years EOF while [ -z "$KEY_EXPIRE" ] ; do read -p "Key is valid for? (0) " KEY_EXPIRE if ! test_gpg_expire ${KEY_EXPIRE:=0} ; then echo "invalid value" unset KEY_EXPIRE fi done elif ! test_gpg_expire "$KEY_EXPIRE" ; then failure "invalid key expiration value '$KEY_EXPIRE'." fi # generate the list of commands that will be passed to edit-key editCommands=$(cat <<EOF addkey 7 S E A Q $KEY_LENGTH $KEY_EXPIRE save EOF ) log "generating subkey..." echo "$editCommands" | gpg --expert --command-fd 0 --edit-key "$keyID" log "done." } ######################################################################## # MAIN ######################################################################## # unset variables that should be defined only in config file unset KEYSERVER unset CHECK_KEYSERVER unset KNOWN_HOSTS unset HASH_KNOWN_HOSTS unset AUTHORIZED_KEYS # load global config [ -r "${ETC}/monkeysphere.conf" ] && . "${ETC}/monkeysphere.conf" # set monkeysphere home directory MONKEYSPHERE_HOME=${MONKEYSPHERE_HOME:="${HOME}/.config/monkeysphere"} mkdir -p -m 0700 "$MONKEYSPHERE_HOME" # load local config [ -e ${MONKEYSPHERE_CONFIG:="${MONKEYSPHERE_HOME}/monkeysphere.conf"} ] && . "$MONKEYSPHERE_CONFIG" # set empty config variables with ones from the environment, or from # config file, or with defaults GNUPGHOME=${MONKEYSPHERE_GNUPGHOME:=${GNUPGHOME:="${HOME}/.gnupg"}} KEYSERVER=${MONKEYSPHERE_KEYSERVER:=${KEYSERVER:="subkeys.pgp.net"}} CHECK_KEYSERVER=${MONKEYSPHERE_CHECK_KEYSERVER:=${CHECK_KEYSERVER:="true"}} KNOWN_HOSTS=${MONKEYSPHERE_KNOWN_HOSTS:=${KNOWN_HOSTS:="${HOME}/.ssh/known_hosts"}} HASH_KNOWN_HOSTS=${MONKEYSPHERE_HASH_KNOWN_HOSTS:=${HASH_KNOWN_HOSTS:="true"}} AUTHORIZED_KEYS=${MONKEYSPHERE_AUTHORIZED_KEYS:=${AUTHORIZED_KEYS:="${HOME}/.ssh/authorized_keys"}} # other variables not in config file AUTHORIZED_USER_IDS=${MONKEYSPHERE_AUTHORIZED_USER_IDS:="${MONKEYSPHERE_HOME}/authorized_user_ids"} REQUIRED_HOST_KEY_CAPABILITY=${MONKEYSPHERE_REQUIRED_HOST_KEY_CAPABILITY:="a"} REQUIRED_USER_KEY_CAPABILITY=${MONKEYSPHERE_REQUIRED_USER_KEY_CAPABILITY:="a"} # export GNUPGHOME and make sure gpg home exists with proper # permissions export GNUPGHOME mkdir -p -m 0700 "$GNUPGHOME" # get subcommand COMMAND="$1" [ "$COMMAND" ] || failure "Type '$PGRM help' for usage." shift # unset option variables unset KEY_LENGTH unset KEY_EXPIRE # get options for key generation and add-certifier functions TEMP=$(getopt -o l:e: -l length:,expire: -n "$PGRM" -- "$@") if [ $? != 0 ] ; then usage exit 1 fi # Note the quotes around `$TEMP': they are essential! eval set -- "$TEMP" while true ; do case "$1" in -l|--length) KEY_LENGTH="$2" shift 2 ;; -e|--expire) KEY_EXPIRE="$2" shift 2 ;; --) shift ;; *) break ;; esac done case $COMMAND in 'update-known_hosts'|'update-known-hosts'|'k') MODE='known_hosts' # if hosts are specified on the command line, process just # those hosts if [ "$1" ] ; then update_known_hosts "$@" RETURN="$?" # otherwise, if no hosts are specified, process every host # in the user's known_hosts file else if [ ! -s "$KNOWN_HOSTS" ] ; then failure "known_hosts file '$KNOWN_HOSTS' is empty or does not exist." fi process_known_hosts RETURN="$?" fi ;; 'update-authorized_keys'|'update-authorized-keys'|'a') MODE='authorized_keys' # fail if the authorized_user_ids file is empty if [ ! -s "$AUTHORIZED_USER_IDS" ] ; then failure "$AUTHORIZED_USER_IDS is empty or does not exist." fi # process authorized_user_ids file process_authorized_user_ids "$AUTHORIZED_USER_IDS" RETURN="$?" ;; 'gen-subkey'|'g') keyID="$1" if [ -z "$keyID" ] ; then failure "You must specify the key ID of your primary key." fi gen_subkey "$keyID" ;; 'help'|'h'|'?') usage ;; *) failure "Unknown command: '$COMMAND' Type '$PGRM help' for usage." ;; esac exit "$RETURN"