path: root/src/monkeysphere-authentication

#!/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

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:
 setup (s)                           setup monkeysphere user authentication
 update-users (u) [USER]...          update user authorized_keys files
 add-id-certifier (c+) KEYID         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 "$@"
}

# 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 $@"
}

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

# fail if authentication has not been setup
check_no_setup() {
    # FIXME: what is the right test to do here?
    [ -d "$MADATADIR" ] \
    || failure "This host appears to have not yet been set up for Monkeysphere authentication.
Please run 'monkeysphere-authentication setup' first."
}

# 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
########################################################################

# unset variables that should be defined only in config file of in
# MONKEYSPHERE_ variables
unset LOG_LEVEL
unset KEYSERVER
unset AUTHORIZED_USER_IDS
unset RAW_AUTHORIZED_KEYS
unset MONKEYSPHERE_USER
unset PROMPT

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

# set empty config variable with ones from the environment, or with
# defaults
LOG_LEVEL=${MONKEYSPHERE_LOG_LEVEL:=${LOG_LEVEL:="INFO"}}
KEYSERVER=${MONKEYSPHERE_KEYSERVER:=${KEYSERVER:="pool.sks-keyservers.net"}}
AUTHORIZED_USER_IDS=${MONKEYSPHERE_AUTHORIZED_USER_IDS:=${AUTHORIZED_USER_IDS:="%h/.monkeysphere/authorized_user_ids"}}
RAW_AUTHORIZED_KEYS=${MONKEYSPHERE_RAW_AUTHORIZED_KEYS:=${RAW_AUTHORIZED_KEYS:="%h/.ssh/authorized_keys"}}
MONKEYSPHERE_USER=${MONKEYSPHERE_MONKEYSPHERE_USER:=${MONKEYSPHERE_USER:="monkeysphere"}}
PROMPT=${MONKEYSPHERE_PROMPT:=${PROMPT:="true"}}

# other variables
CHECK_KEYSERVER=${MONKEYSPHERE_CHECK_KEYSERVER:="true"}
REQUIRED_USER_KEY_CAPABILITY=${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')
    check_no_setup
    source "${MASHAREDIR}/update_users"
    update_users "$@"
    ;;

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

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

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

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

    'gpg-cmd')
    check_no_setup
    gpg_sphere "$@"
    ;;

    'version'|'v')
    echo "$VERSION"
    ;;

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

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

exit "$RETURN"