path: root/src/monkeysphere-server

#!/bin/sh

########################################################################
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 authorized_keys file
  gen-key (g)                               generate gpg key for the host
  publish-key (p)                           publish host gpg to keyserver
  trust-key (t) KEYID [KEYID]...            mark keyid as trusted
  update-user-userid (u) USER UID [UID]...  add/update userid for user
  help (h,?)                                this help

EOF
}

# generate server gpg key
gen_key() {
    KEY_TYPE=${KEY_TYPE:-RSA}
    KEY_LENGTH=${KEY_LENGTH:-2048}
    KEY_USAGE=${KEY_USAGE:-encrypt,auth}
    SERVICE=${SERVICE:-ssh}
    HOSTNAME_FQDN=${HOSTNAME_FQDN:-$(hostname -f)}

    USERID=${USERID:-"$SERVICE"://"$HOSTNAME_FQDN"}

    echo "key parameters:"
    cat <<EOF
Key-Type: $KEY_TYPE
Key-Length: $KEY_LENGTH
Key-Usage: $KEY_USAGE
Name-Real: $USERID
EOF

    read -p "generate key? [Y|n]: " OK; OK=${OK:=Y}
    if [ ${OK/y/Y} != 'Y' ] ; then
    failure "aborting."
    fi

    if gpg --list-key ="$USERID" > /dev/null 2>&1 ; then
    failure "key for '$USERID' already exists"
    fi

    echo "generating server key..."
    gpg --batch --gen-key <<EOF
Key-Type: $KEY_TYPE
Key-Length: $KEY_LENGTH
Key-Usage: $KEY_USAGE
Name-Real: $USERID
%commit
EOF
}

# publish server key to keyserver
publish_key() {
    read -p "publish key to $KEYSERVER? [Y|n]: " OK; OK=${OK:=Y}
    if [ ${OK/y/Y} != 'Y' ] ; then
    failure "aborting."
    fi

    keyID=$(gpg --list-key --with-colons ="$USERID" 2> /dev/null | grep '^pub:' | cut -d: -f5)

    # dummy command so as not to publish fakes keys during testing
    # eventually:
    #gpg --send-keys --keyserver "$KEYSERVER" "$keyID"
    echo "gpg --send-keys --keyserver $KEYSERVER $keyID"
}

# trust key
trust_key() {
    for keyID ; do
    # get the key from the key server
    gpg --keyserver "$KEYSERVER" --recv-key "$keyID" || failure "could not retrieve key '$keyID'"

    # edit the key to change trust
    # FIXME: need to figure out how to automate this,
    # in a batch mode or something.
    gpg --edit-key "$keyID"
    done
}

########################################################################
# 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=${KEYSERVER:-subkeys.pgp.net}
REQUIRED_KEY_CAPABILITY=${REQUIRED_KEY_CAPABILITY:-"e a"}
USER_CONTROLLED_AUTHORIZED_KEYS=${USER_CONTROLLED_AUTHORIZED_KEYS:-%h/.ssh/authorized_keys}
STAGING_AREA=${STAGING_AREA:-"$LIB"/stage}

export GNUPGHOME

# make sure gpg home exists with proper permissions
mkdir -p -m 0700 "$GNUPGHOME"

case $COMMAND in
    'update-users'|'s')
    if [ "$1" ] ; then
        unames="$@"
    else
        unames=$(ls -1 "$MS_HOME"/authorized_user_ids)
    fi

    for uname in $unames ; do
        MODE="authorized_keys"
        authorizedUserIDs="$MS_HOME"/authorized_user_ids/"$uname"
        cacheDir="$STAGING_AREA"/"$uname"/user_keys
        msAuthorizedKeys="$STAGING_AREA"/"$uname"/authorized_keys

            # make sure authorized_user_ids file exists
        if [ ! -s "$authorizedUserIDs" ] ; then
        log "authorized_user_ids file for '$uname' is empty or does not exist."
        continue
        fi

        log "processing authorized_keys for user '$uname'..."

        process_authorized_ids "$authorizedUserIDs" "$cacheDir"

            # write output key file
        log "writing monkeysphere authorized_keys file... "
        touch "$msAuthorizedKeys"
        if [ "$(ls "$cacheDir")" ] ; then
        log -n "adding gpg keys... "
        cat "$cacheDir"/* > "$msAuthorizedKeys"
        echo "done."
        else
        log "no gpg keys to add."
        fi
        if [ "$USER_CONTROLLED_AUTHORIZED_KEYS" ] ; then
        userHome=$(getent passwd "$uname" | cut -d: -f6)
        userAuthorizedKeys=${USER_CONTROLLED_AUTHORIZED_KEYS/\%h/"$userHome"}
        if [ -s "$userAuthorizedKeys" ] ; then
            log -n "adding user authorized_keys file... "
            cat "$userAuthorizedKeys" >> "$msAuthorizedKeys"
            echo "done."
        fi
        fi
        log "monkeysphere authorized_keys file generated:"
        log "$msAuthorizedKeys"
    done
    ;;

    'gen-key'|'g')
    gen_key
    ;;

    'publish-key'|'p')
    publish_key
    ;;

    'trust-key'|'t')
    if [ -z "$1" ] ; then
        failure "you must specify at least one key to trust."
    fi
    trust_key "$@"
    ;;

    'update-user-userid'|'u')
    uname="$1"
    shift
    if [ -z "$uname" ] ; then
        failure "you must specify user."
    fi
    if [ -z "$1" ] ; then
        failure "you must specify at least one userid."
    fi
    for userID ; do
        AUTHORIZED_USER_IDS="$MS_HOME"/authorized_user_ids/"$uname"
        if ! grep -q "^${userID}\$" "$AUTHORIZED_USER_IDS" ; then
        log "userid '$userID' not in authorized_user_ids file."
        continue
        fi
        log "processing user id: '$userID'"
        process_user_id "$userID" "$userKeysCacheDir" > /dev/null
    done
    ;;

    'help'|'h'|'?')
        usage
        ;;

    *)
        failure "Unknown command: '$COMMAND'
Type 'cereal-admin help' for usage."
        ;;
esac