#!/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 $0) SHAREDIR=${SHAREDIR:-"/usr/share/monkeysphere"} export SHAREDIR . "${SHAREDIR}/common" GLOBAL_CONFIG=${GLOBAL_CONFIG:-"${ETC}/monkeysphere.conf"} [ -r "$GLOBAL_CONFIG" ] && . "$GLOBAL_CONFIG" # date in UTF format if needed DATE=$(date -u '+%FT%T') # unset some environment variables that could screw things up GREP_OPTIONS= # default return code ERR=0 ######################################################################## # FUNCTIONS ######################################################################## usage() { cat <<EOF usage: $PGRM <subcommand> [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 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 [ "${OK/y/Y}" != 'Y' ] ; then failure "aborting." fi fi # set subkey defaults SUBKEY_TYPE=${SUBKEY_TYPE:-"RSA"} SUBKEY_LENGTH=${SUBKEY_LENGTH:-} SUBKEY_USAGE=${SUBKEY_USAGE:-"auth"} SUBKEY_EXPIRE=${SUBKEY_EXPIRE:-"0"} cat <<EOF Please specify how long the key should be valid. 0 = key does not expire <n> = key expires in n days <n>w = key expires in n weeks <n>m = key expires in n months <n>y = key expires in n years EOF read -p "Key is valid for? ($SUBKEY_EXPIRE) " SUBKEY_EXPIRE; SUBKEY_EXPIRE=${SUBKEY_EXPIRE:-"0"} # generate the list of commands that will be passed to edit-key editCommands=$(cat <<EOF addkey 7 S E A Q $SUBKEY_LENGTH $SUBKEY_EXPIRE save EOF ) log "generating subkey..." echo "$editCommands" | gpg --expert --command-fd 0 --edit-key "$keyID" log "done." } ######################################################################## # MAIN ######################################################################## COMMAND="$1" [ "$COMMAND" ] || failure "Type '$PGRM help' for usage." shift # set ms home directory MS_HOME=${MS_HOME:-"${HOME}/.config/monkeysphere"} # load configuration file MS_CONF=${MS_CONF:-"${MS_HOME}/monkeysphere.conf"} [ -e "$MS_CONF" ] && . "$MS_CONF" # set empty config variable with defaults GNUPGHOME=${GNUPGHOME:-"${HOME}/.gnupg"} KEYSERVER=${KEYSERVER:-"subkeys.pgp.net"} CHECK_KEYSERVER=${CHECK_KEYSERVER:="true"} KNOWN_HOSTS=${KNOWN_HOSTS:-"${HOME}/.ssh/known_hosts"} HASH_KNOWN_HOSTS=${HASH_KNOWN_HOSTS:-"true"} AUTHORIZED_KEYS=${AUTHORIZED_KEYS:-"${HOME}/.ssh/authorized_keys"} # other variables AUTHORIZED_USER_IDS=${AUTHORIZED_USER_IDS:-"${MS_HOME}/authorized_user_ids"} REQUIRED_HOST_KEY_CAPABILITY=${REQUIRED_HOST_KEY_CAPABILITY:-"a"} REQUIRED_USER_KEY_CAPABILITY=${REQUIRED_USER_KEY_CAPABILITY:-"a"} export GNUPGHOME # make sure gpg home exists with proper permissions mkdir -p -m 0700 "$GNUPGHOME" # make sure the user monkeysphere home directory exists mkdir -p -m 0700 "$MS_HOME" touch "$AUTHORIZED_USER_IDS" case $COMMAND in 'update-known_hosts'|'update-known-hosts'|'k') MODE='known_hosts' # touch the known_hosts file to make sure it exists # ssh-keygen complains if it doesn't exist touch "$KNOWN_HOSTS" # if hosts are specified on the command line, process just # those hosts if [ "$1" ] ; then update_known_hosts "$@" || ERR=1 # 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." fi log "processing known_hosts file..." process_known_hosts || ERR=1 fi log "known_hosts file updated." ;; '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." fi # process authorized_user_ids file log "processing authorized_user_ids file..." process_authorized_user_ids "$AUTHORIZED_USER_IDS" || ERR=1 log "authorized_keys file updated." ;; '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 '$PGRM help' for usage." ;; esac exit "$ERR"