#!/usr/bin/env bash

# monkeysphere-authentication: Monkeysphere authentication admin tool
#
# The monkeysphere scripts are written by:
# Jameson Rollins <jrollins@finestructure.net>
# Jamie McClelland <jm@mayfirst.org>
# Daniel Kahn Gillmor <dkg@fifthhorseman.net>
# Micah Anderson <micah@riseup.net>
#
# They are Copyright 2008-2009, and are all released under the GPL,
# version 3 or later.

########################################################################
set -e

# set the pipefail option so pipelines fail on first command failure
set -o pipefail

PGRM=$(basename $0)

SYSSHAREDIR=${MONKEYSPHERE_SYSSHAREDIR:-"/usr/share/monkeysphere"}
export SYSSHAREDIR
. "${SYSSHAREDIR}/common" || exit 1

SYSDATADIR=${MONKEYSPHERE_SYSDATADIR:-"/var/lib/monkeysphere"}
export SYSDATADIR

# sharedir for authentication functions
MASHAREDIR="${SYSSHAREDIR}/ma"

# datadir for authentication functions
MADATADIR="${SYSDATADIR}/authentication"

# temp directory to enable atomic moves of authorized_keys files
MATMPDIR="${MADATADIR}/tmp"
export MATMPDIR

# UTC date in ISO 8601 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 >&2
usage: $PGRM <subcommand> [options] [args]
Monkeysphere authentication admin tool.

subcommands:
 update-users (u) [USER]...          update user authorized_keys files

 add-id-certifier (c+) [KEYID|FILE]  import and tsign a certification key
   --domain (-n) DOMAIN                limit ID certifications to DOMAIN
   --trust (-t) TRUST                  trust level of certifier (full)
   --depth (-d) DEPTH                  trust depth for certifier (1)
 remove-id-certifier (c-) KEYID      remove a certification key
 list-id-certifiers (c)              list certification keys

 version (v)                         show version number
 help (h,?)                          this help

See ${PGRM}(8) for more info.
EOF
}

# function to interact with the gpg core keyring
gpg_core() {
    GNUPGHOME="$GNUPGHOME_CORE"
    export GNUPGHOME

    gpg --no-greeting --quiet --no-tty "$@"
}

# function to interact with the gpg sphere keyring
# FIXME: this function requires only a single argument because of
# problems with quote expansion.  this needs to be fixed/improved.
gpg_sphere() {
    GNUPGHOME="$GNUPGHOME_SPHERE"
    export GNUPGHOME
 
    su_monkeysphere_user "gpg --no-greeting --quiet --no-tty $@"
}

# output to stdout the core fingerprint from the gpg core secret
# keyring
core_fingerprint() {
    log debug "determining core key fingerprint..."
    gpg_core --list-secret-key --with-colons \
	--fixed-list-mode --with-fingerprint \
	| grep ^fpr: | cut -d: -f10
}

# export signatures from core to sphere
gpg_core_sphere_sig_transfer() {
    log debug "exporting core local sigs to sphere..."
    gpg_core --export-options export-local-sigs --export | \
	gpg_sphere "--import-options import-local-sigs --import"
}

########################################################################
# MAIN
########################################################################

# set unset default variables
AUTHORIZED_USER_IDS="%h/.monkeysphere/authorized_user_ids"
RAW_AUTHORIZED_KEYS="%h/.ssh/authorized_keys"

# load configuration file
[ -e ${MONKEYSPHERE_AUTHENTICATION_CONFIG:="${SYSCONFIGDIR}/monkeysphere-authentication.conf"} ] \
    && . "$MONKEYSPHERE_AUTHENTICATION_CONFIG"

# set empty config variable with ones from the environment
LOG_LEVEL=${MONKEYSPHERE_LOG_LEVEL:=$LOG_LEVEL}
KEYSERVER=${MONKEYSPHERE_KEYSERVER:=$KEYSERVER}
CHECK_KEYSERVER=${MONKEYSPHERE_CHECK_KEYSERVER:=$CHECK_KEYSERVER}
MONKEYSPHERE_USER=${MONKEYSPHERE_MONKEYSPHERE_USER:=$MONKEYSPHERE_USER}
PROMPT=${MONKEYSPHERE_PROMPT:=$PROMPT}
AUTHORIZED_USER_IDS=${MONKEYSPHERE_AUTHORIZED_USER_IDS:=$AUTHORIZED_USER_IDS}
RAW_AUTHORIZED_KEYS=${MONKEYSPHERE_RAW_AUTHORIZED_KEYS:=$RAW_AUTHORIZED_KEYS}

# other variables
REQUIRED_USER_KEY_CAPABILITY=${MONKEYSPHERE_REQUIRED_USER_KEY_CAPABILITY:="a"}
GNUPGHOME_CORE=${MONKEYSPHERE_GNUPGHOME_CORE:="${MADATADIR}/core"}
GNUPGHOME_SPHERE=${MONKEYSPHERE_GNUPGHOME_SPHERE:="${MADATADIR}/sphere"}
CORE_KEYLENGTH=${MONKEYSPHERE_CORE_KEYLENGTH:="2048"}

# export variables needed in su invocation
export DATE
export MODE
export LOG_LEVEL
export KEYSERVER
export MONKEYSPHERE_USER
export PROMPT
export CHECK_KEYSERVER
export REQUIRED_USER_KEY_CAPABILITY
export GNUPGHOME_CORE
export GNUPGHOME_SPHERE
export GNUPGHOME
export CORE_KEYLENGTH

# get subcommand
COMMAND="$1"
[ "$COMMAND" ] || failure "Type '$PGRM help' for usage."
shift

case $COMMAND in
    'setup'|'setup'|'s')
	source "${MASHAREDIR}/setup"
	setup
	;;

    'update-users'|'update-user'|'u')
	source "${MASHAREDIR}/setup"
	setup
	source "${MASHAREDIR}/update_users"
	update_users "$@"
	;;

    'add-identity-certifier'|'add-id-certifier'|'add-certifier'|'c+')
	source "${MASHAREDIR}/setup"
	setup
	source "${MASHAREDIR}/add_certifier"
	add_certifier "$@"
	;;

    'remove-identity-certifier'|'remove-id-certifier'|'remove-certifier'|'c-')
	source "${MASHAREDIR}/setup"
	setup
	source "${MASHAREDIR}/remove_certifier"
	remove_certifier "$@"
	;;

    'list-identity-certifiers'|'list-id-certifiers'|'list-certifiers'|'list-certifier'|'c')
	source "${MASHAREDIR}/setup"
	setup
	source "${MASHAREDIR}/list_certifiers"
	list_certifiers
	;;

    'diagnostics'|'d')
	source "${MASHAREDIR}/setup"
	setup
	source "${MASHAREDIR}/diagnostics"
	diagnostics
	;;

    'gpg-cmd')
	source "${MASHAREDIR}/setup"
	setup
	gpg_sphere "$@"
	;;

    'version'|'v')
	version
	;;

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

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

exit "$RETURN"