-- SQLite3 schema for Cryptech PKCS #11 implementation.
--
-- Author: Rob Austein
-- Copyright (c) 2015, SUNET
-- 
-- Redistribution and use in source and binary forms, with or 
-- without modification, are permitted provided that the following 
-- conditions are met: 
-- 
-- 1. Redistributions of source code must retain the above copyright 
--    notice, this list of conditions and the following disclaimer. 
-- 
-- 2. Redistributions in binary form must reproduce the above copyright 
--    notice, this list of conditions and the following disclaimer in 
--    the documentation and/or other materials provided with the 
--    distribution. 
-- 
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
-- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
-- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
-- FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
-- COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
-- INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
-- BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-- LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
-- CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
-- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
-- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

-- Notes:
--
-- The CHECK constraints in the attribute tables are checking
-- CKA_TOKEN, to make sure we don't accidently file token objects in
-- the session table or vice versa.
--
-- temp.object.token_object_id is a foreign-key reference to
-- main.token_object.id, but we can't use a real foreign key reference
-- because they're in different databases.  If we're careful about how
-- we do our joins, this is harmless, but may lead to some clutter if
-- a long running session has handles on token objects which some
-- other process deletes from the database.  If this happens and we
-- care for some reason, we can clean up such clutter with something
-- like:
--
--     WITH
--         known AS (SELECT token_object_id FROM token_object)
--     DELETE FROM object
--     WHERE  token_object_id IS NOT NULL
--     AND    token_object_id NOT IN known;

PRAGMA foreign_keys = ON;

CREATE TEMPORARY TABLE IF NOT EXISTS session (
        session_id              INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
        session_handle          INTEGER NOT NULL UNIQUE
                                CHECK (session_handle > 0 AND session_handle <= 0xFFFFFFFF)
);

CREATE TEMPORARY TABLE IF NOT EXISTS object (
        object_id               INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
        object_handle           INTEGER NOT NULL UNIQUE
                                CHECK (object_handle > 0 AND object_handle <= 0xFFFFFFFF),
        session_id              INTEGER REFERENCES session
                                ON DELETE CASCADE ON UPDATE CASCADE
                                DEFERRABLE INITIALLY DEFERRED,
        token_object_id         INTEGER,
        session_object_id       INTEGER REFERENCES session_object
                                ON DELETE CASCADE ON UPDATE CASCADE
                                DEFERRABLE INITIALLY DEFERRED,
        CHECK                   (token_object_id IS NULL OR (session_id IS NULL AND session_object_id IS NULL)),
        UNIQUE                  (token_object_id),
        UNIQUE                  (session_id, session_object_id)
);

CREATE TEMPORARY TABLE IF NOT EXISTS session_object (
        session_object_id       INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
        keyid                   TEXT UNIQUE,
        object_id               INTEGER NOT NULL UNIQUE
                                REFERENCES object
                                ON DELETE CASCADE ON UPDATE CASCADE
);

CREATE TEMPORARY TABLE IF NOT EXISTS session_attribute (
        type                    INTEGER NOT NULL,
        session_object_id       INTEGER NOT NULL REFERENCES session_object
                                ON DELETE CASCADE ON UPDATE CASCADE,
        value                   BLOB NOT NULL,
        UNIQUE                  (type, session_object_id),
        CHECK                   (type <> 1 OR value = X'00')
);

CREATE TABLE IF NOT EXISTS token_object (
        token_object_id         INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
        keyid                   TEXT UNIQUE
);

CREATE TABLE IF NOT EXISTS token_attribute (
        type                    INTEGER NOT NULL,
        token_object_id         INTEGER NOT NULL REFERENCES token_object
                                ON DELETE CASCADE ON UPDATE CASCADE,
        value                   BLOB NOT NULL,
        UNIQUE                  (type, token_object_id),
        CHECK                   (type <> 1 OR value <> X'00')
);

-- http://sqlite.org/foreignkeys.html says we might want these.

CREATE INDEX IF NOT EXISTS temp.object__session                         ON object(session_id);
CREATE INDEX IF NOT EXISTS temp.object__session_object                  ON object(session_object_id);
CREATE INDEX IF NOT EXISTS temp.session_object__object                  ON session_object(object_id);
CREATE INDEX IF NOT EXISTS temp.session_attribute__session_object       ON session_attribute(session_object_id);
CREATE INDEX IF NOT EXISTS token_attribute__token_object                ON token_attribute(token_object_id);

-- Local variables:
-- indent-tabs-mode: nil
-- End: