[apple/securityd.git] / src / kcdatabase.cpp

/*
 * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
 * 
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 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
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 * file.
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//
// kcdatabase - software database container implementation.
//
// General implementation notes:
// This leverages LocalDatabase/LocalKey for cryptography, and adds the
//  storage coder/decoder logic that implements "keychain" databases in their
//  intricately choreographed dance between securityd and the AppleCSPDL.
// As always, Database objects are lifetime-bound to their Process referent;
//  they can also be destroyed explicitly with a client release call.
// DbCommons are reference-held by their Databases, with one extra special
//  reference (from the Session) introduced when the database unlocks, and
//  removed when it locks again. That way, an unused DbCommon dies when it
//  is locked or when the Session dies, whichever happens earlier.
// There is (as yet) no global-scope Database object for Keychain databases.
//
#include "kcdatabase.h"
#include "agentquery.h"
#include "kckey.h"
#include "server.h"
#include "session.h"
#include "notifications.h"
#include <security_agent_client/agentclient.h>
#include <security_cdsa_utilities/acl_any.h>    // for default owner ACLs
#include <security_cdsa_client/wrapkey.h>
#include <security_cdsa_client/genkey.h>
#include <security_cdsa_client/signclient.h>
#include <security_cdsa_client/cryptoclient.h>
#include <security_cdsa_client/macclient.h>
#include <securityd_client/dictionary.h>
#include <security_utilities/endian.h>


//
// Create a Database object from initial parameters (create operation)
//
KeychainDatabase::KeychainDatabase(const DLDbIdentifier &id, const DBParameters &params, Process &proc,
            const AccessCredentials *cred, const AclEntryPrototype *owner)
    : LocalDatabase(proc), mValidData(false), version(0), mBlob(NULL)
{
    // save a copy of the credentials for later access control
    mCred = DataWalkers::copy(cred, Allocator::standard());

    // create a new random signature to complete the DLDbIdentifier
    DbBlob::Signature newSig;
    Server::active().random(newSig.bytes);
    DbIdentifier ident(id, newSig);
        
    // create common block and initialize
        RefPointer<KeychainDbCommon> newCommon = new KeychainDbCommon(proc.session(), ident);
        StLock<Mutex> _(*newCommon);
        parent(*newCommon);
        // new common is now visible (in ident-map) but we hold its lock

        // establish the new master secret
        establishNewSecrets(cred, SecurityAgent::newDatabase);
        
        // set initial database parameters
        common().mParams = params;
                
        // the common is "unlocked" now
        common().makeNewSecrets();

        // establish initial ACL
        if (owner)
                cssmSetInitial(*owner);
        else
                cssmSetInitial(new AnyAclSubject());
    mValidData = true;
    
    // for now, create the blob immediately
    encode();
    
        proc.addReference(*this);
        secdebug("SSdb", "database %s(%p) created, common at %p",
                common().dbName(), this, &common());
}


//
// Create a Database object from a database blob (decoding)
//
KeychainDatabase::KeychainDatabase(const DLDbIdentifier &id, const DbBlob *blob, Process &proc,
    const AccessCredentials *cred)
        : LocalDatabase(proc), mValidData(false), version(0)
{
    // perform basic validation on the incoming blob
        assert(blob);
    blob->validate(CSSMERR_APPLEDL_INVALID_DATABASE_BLOB);
    switch (blob->version()) {
#if defined(COMPAT_OSX_10_0)
    case blob->version_MacOS_10_0:
        break;
#endif
    case blob->version_MacOS_10_1:
        break;
    default:
        CssmError::throwMe(CSSMERR_APPLEDL_INCOMPATIBLE_DATABASE_BLOB);
    }

    // save a copy of the credentials for later access control
    mCred = DataWalkers::copy(cred, Allocator::standard());
    mBlob = blob->copy();
    
    // check to see if we already know about this database
    DbIdentifier ident(id, blob->randomSignature);
        Session &session = process().session();
        StLock<Mutex> _(session);
        if (KeychainDbCommon *dbcom =
                        session.findFirst<KeychainDbCommon, const DbIdentifier &>(&KeychainDbCommon::identifier, ident)) {
                parent(*dbcom);
                //@@@ arbitrate sequence number here, perhaps update common().mParams
                secdebug("SSdb",
                        "open database %s(%p) version %lx at known common %p",
                        common().dbName(), this, blob->version(), &common());
        } else {
                // DbCommon not present; make a new one
                parent(*new KeychainDbCommon(proc.session(), ident));
                common().mParams = blob->params;
                secdebug("SSdb", "open database %s(%p) version %lx with new common %p",
                        common().dbName(), this, blob->version(), &common());
        }
        proc.addReference(*this);
}


//
// Destroy a Database
//
KeychainDatabase::~KeychainDatabase()
{
    secdebug("SSdb", "deleting database %s(%p) common %p",
        common().dbName(), this, &common());
    Allocator::standard().free(mCred);
        Allocator::standard().free(mBlob);
}


//
// Basic Database virtual implementations
//
KeychainDbCommon &KeychainDatabase::common() const
{
        return parent<KeychainDbCommon>();
}

const char *KeychainDatabase::dbName() const
{
        return common().dbName();
}


static inline KeychainKey &myKey(Key *key)
{
        return *safe_cast<KeychainKey *>(key);
}


//
// (Re-)Authenticate the database. This changes the stored credentials.
//
void KeychainDatabase::authenticate(const AccessCredentials *cred)
{
        StLock<Mutex> _(common());
        AccessCredentials *newCred = DataWalkers::copy(cred, Allocator::standard());
    Allocator::standard().free(mCred);
    mCred = newCred;
}


//
// Make a new KeychainKey
//
RefPointer<Key> KeychainDatabase::makeKey(const CssmKey &newKey,
        uint32 moreAttributes, const AclEntryPrototype *owner)
{
        return new KeychainKey(*this, newKey, moreAttributes, owner);
}


//
// Return the database blob, recalculating it as needed.
//
DbBlob *KeychainDatabase::blob()
{
        StLock<Mutex> _(common());
    if (!validBlob()) {
        makeUnlocked();                 // unlock to get master secret
                encode();                               // (re)encode blob if needed
    }
    activity();                                 // reset timeout
        assert(validBlob());            // better have a valid blob now...
    return mBlob;
}


//
// Encode the current database as a blob.
// Note that this returns memory we own and keep.
// Caller must hold common lock.
//
void KeychainDatabase::encode()
{
        DbBlob *blob = common().encode(*this);
        Allocator::standard().free(mBlob);
        mBlob = blob;
        version = common().version;
        secdebug("SSdb", "encoded database %p common %p(%s) version %ld params=(%ld,%d)",
                this, &common(), dbName(), version,
                common().mParams.idleTimeout, common().mParams.lockOnSleep);
}


//
// Change the passphrase on a database
//
void KeychainDatabase::changePassphrase(const AccessCredentials *cred)
{
        // get and hold the common lock (don't let other threads break in here)
        StLock<Mutex> _(common());
        
        // establish OLD secret - i.e. unlock the database
        //@@@ do we want to leave the final lock state alone?
        makeUnlocked(cred);
        
    // establish NEW secret
        establishNewSecrets(cred, SecurityAgent::changePassphrase);
        common().version++;     // blob state changed
        secdebug("SSdb", "Database %s(%p) master secret changed", common().dbName(), this);
        encode();                       // force rebuild of local blob
        
        // send out a notification
        notify(kNotificationEventPassphraseChanged);

    // I guess this counts as an activity
    activity();
}


//
// Extract the database master key as a proper Key object.
//
RefPointer<Key> KeychainDatabase::extractMasterKey(Database &db,
        const AccessCredentials *cred, const AclEntryPrototype *owner,
        uint32 usage, uint32 attrs)
{
        // get and hold common lock
        StLock<Mutex> _(common());
        
        // unlock to establish master secret
        makeUnlocked(cred);
        
        // extract the raw cryptographic key
        CssmClient::WrapKey wrap(Server::csp(), CSSM_ALGID_NONE);
        CssmKey key;
        wrap(common().masterKey(), key);
        
        // make the key object and return it
        return new KeychainKey(db, key, attrs & Key::managedAttributes, owner);
}


//
// Construct a binary blob of moderate size that is suitable for constructing
// an index identifying this database.
// We construct this from the database's marker blob, which is created with
// the database is made, and stays stable thereafter.
// Note: Ownership of the index blob passes to the caller.
// @@@ This means that physical copies share this index.
//
void KeychainDatabase::getDbIndex(CssmData &indexData)
{
        if (!mBlob)
                encode();       // force blob creation
        assert(mBlob);
        CssmData signature = CssmData::wrap(mBlob->randomSignature);
        indexData = CssmAutoData(Allocator::standard(), signature).release();
}


//
// Unlock this database (if needed) by obtaining the master secret in some
// suitable way and then proceeding to unlock with it.
// Does absolutely nothing if the database is already unlocked.
// The makeUnlocked forms are identical except the assume the caller already
// holds the common lock.
//
void KeychainDatabase::unlockDb()
{
        StLock<Mutex> _(common());
        makeUnlocked();
}

void KeychainDatabase::makeUnlocked()
{
        return makeUnlocked(mCred);
}

void KeychainDatabase::makeUnlocked(const AccessCredentials *cred)
{
    if (isLocked()) {
                secdebug("SSdb", "%p(%p) unlocking for makeUnlocked()", this, &common());
        assert(mBlob || (mValidData && common().hasMaster()));
                establishOldSecrets(cred);
                common().setUnlocked(); // mark unlocked
                activity();                             // set timeout timer
        } else if (!mValidData) {       // need to decode to get our ACLs, master secret available
                secdebug("SSdb", "%p(%p) is unlocked; decoding for makeUnlocked()", this, &common());
                if (!decode())
                        CssmError::throwMe(CSSM_ERRCODE_OPERATION_AUTH_DENIED);
        }
        assert(!isLocked());
        assert(mValidData);
}


//
// The following unlock given an explicit passphrase, rather than using
// (special cred sample based) default procedures.
//
void KeychainDatabase::unlockDb(const CssmData &passphrase)
{
        StLock<Mutex> _(common());
        makeUnlocked(passphrase);
}

void KeychainDatabase::makeUnlocked(const CssmData &passphrase)
{
        if (isLocked()) {
                if (decode(passphrase))
                        return;
                else
                        CssmError::throwMe(CSSM_ERRCODE_OPERATION_AUTH_DENIED);
        } else if (!mValidData) {       // need to decode to get our ACLs, passphrase available
                if (!decode())
                        CssmError::throwMe(CSSM_ERRCODE_OPERATION_AUTH_DENIED);
        }
        assert(!isLocked());
        assert(mValidData);
}


//
// Nonthrowing passphrase-based unlock. This returns false if unlock failed.
// Note that this requires an explicitly given passphrase.
// Caller must hold common lock.
//
bool KeychainDatabase::decode(const CssmData &passphrase)
{
        assert(mBlob);
        common().setup(mBlob, passphrase);
        return decode();
}


//
// Given the established master secret, decode the working keys and other
// functional secrets for this database. Return false (do NOT throw) if
// the decode fails. Call this in low(er) level code once you established
// the master key.
//
bool KeychainDatabase::decode()
{
        assert(mBlob);
        assert(common().hasMaster());
        void *privateAclBlob;
        if (common().unlockDb(mBlob, &privateAclBlob)) {
                if (!mValidData) {
                        importBlob(mBlob->publicAclBlob(), privateAclBlob);
                        mValidData = true;
                }
                Allocator::standard().free(privateAclBlob);
                return true;
        }
        secdebug("SSdb", "%p decode failed", this);
        return false;
}


//
// Given an AccessCredentials for this database, wring out the existing primary
// database secret by whatever means necessary.
// On entry, caller must hold the database common lock. It will be held throughout.
// On exit, the crypto core has its master secret. If things go wrong,
// we will throw a suitable exception. Note that encountering any malformed
// credential sample will throw, but this is not guaranteed -- don't assume
// that NOT throwing means creds is entirely well-formed (it may just be good
// enough to work THIS time).
//
// How this works:
// Walk through the creds. Fish out those credentials (in order) that
// are for unlock processing (they have no ACL subject correspondents),
// and (try to) obey each in turn, until one produces a valid secret
// or you run out. If no special samples are found at all, interpret that as
// "use the system global default," which happens to be hard-coded right here.
//
void KeychainDatabase::establishOldSecrets(const AccessCredentials *creds)
{
        list<CssmSample> samples;
        if (creds && creds->samples().collect(CSSM_SAMPLE_TYPE_KEYCHAIN_LOCK, samples)) {
                for (list<CssmSample>::iterator it = samples.begin(); it != samples.end(); it++) {
                        TypedList &sample = *it;
                        sample.checkProper();
                        switch (sample.type()) {
                        // interactively prompt the user - no additional data
                        case CSSM_SAMPLE_TYPE_KEYCHAIN_PROMPT:
                                {
                                secdebug("SSdb", "%p attempting interactive unlock", this);
                                QueryUnlock query(*this);
                                query.inferHints(Server::process());
                                if (query() == SecurityAgent::noReason)
                                        return;
                                }
                                break;
                        // try to use an explicitly given passphrase - Data:passphrase
                        case CSSM_SAMPLE_TYPE_PASSWORD:
                                if (sample.length() != 2)
                                        CssmError::throwMe(CSSM_ERRCODE_INVALID_SAMPLE_VALUE);
                                secdebug("SSdb", "%p attempting passphrase unlock", this);
                                if (decode(sample[1]))
                                        return;
                                break;
                        // try to open with a given master key - Data:CSP or KeyHandle, Data:CssmKey
                        case CSSM_WORDID_SYMMETRIC_KEY:
                                assert(mBlob);
                                secdebug("SSdb", "%p attempting explicit key unlock", this);
                                common().setup(mBlob, keyFromCreds(sample));
                                if (decode())
                                        return;
                                break;
                        // explicitly defeat the default action but don't try anything in particular
                        case CSSM_WORDID_CANCELED:
                                secdebug("SSdb", "%p defeat default action", this);
                                break;
                        default:
                                // Unknown sub-sample for unlocking.
                                // If we wanted to be fascist, we could now do
                                //  CssmError::throwMe(CSSM_ERRCODE_SAMPLE_VALUE_NOT_SUPPORTED);
                                // But instead we try to be tolerant and continue on.
                                // This DOES however count as an explicit attempt at specifying unlock,
                                // so we will no longer try the default case below...
                                secdebug("SSdb", "%p unknown sub-sample unlock (%ld) ignored", this, sample.type());
                                break;
                        }
                }
        } else {
                // default action
                assert(mBlob);
                
                // attempt system-keychain unlock
                SystemKeychainKey systemKeychain(kSystemUnlockFile);
                if (systemKeychain.matches(mBlob->randomSignature)) {
                        secdebug("SSdb", "%p attempting system unlock", this);
                        common().setup(mBlob, CssmClient::Key(Server::csp(), systemKeychain.key(), true));
                        if (decode())
                                return;
                }
                
                // attempt interactive unlock
                QueryUnlock query(*this);
                query.inferHints(Server::process());
                if (query() == SecurityAgent::noReason)
                        return;
        }
        
        // out of options - no secret obtained
        CssmError::throwMe(CSSM_ERRCODE_OPERATION_AUTH_DENIED);
}


//
// Same thing, but obtain a new secret somehow and set it into the common.
//
void KeychainDatabase::establishNewSecrets(const AccessCredentials *creds, SecurityAgent::Reason reason)
{
        list<CssmSample> samples;
        if (creds && creds->samples().collect(CSSM_SAMPLE_TYPE_KEYCHAIN_CHANGE_LOCK, samples)) {
                for (list<CssmSample>::iterator it = samples.begin(); it != samples.end(); it++) {
                        TypedList &sample = *it;
                        sample.checkProper();
                        switch (sample.type()) {
                        // interactively prompt the user
                        case CSSM_SAMPLE_TYPE_KEYCHAIN_PROMPT:
                                {
                                secdebug("SSdb", "%p specified interactive passphrase", this);
                                QueryNewPassphrase query(*this, reason);
                                query.inferHints(Server::process());
                                CssmAutoData passphrase(Allocator::standard(Allocator::sensitive));
                                if (query(passphrase) == SecurityAgent::noReason) {
                                        common().setup(NULL, passphrase);
                                        return;
                                }
                                }
                                break;
                        // try to use an explicitly given passphrase
                        case CSSM_SAMPLE_TYPE_PASSWORD:
                                secdebug("SSdb", "%p specified explicit passphrase", this);
                                if (sample.length() != 2)
                                        CssmError::throwMe(CSSM_ERRCODE_INVALID_SAMPLE_VALUE);
                                common().setup(NULL, sample[1]);
                                return;
                        // try to open with a given master key
                        case CSSM_WORDID_SYMMETRIC_KEY:
                                secdebug("SSdb", "%p specified explicit master key", this);
                                common().setup(NULL, keyFromCreds(sample));
                                return;
                        // explicitly defeat the default action but don't try anything in particular
                        case CSSM_WORDID_CANCELED:
                                secdebug("SSdb", "%p defeat default action", this);
                                break;
                        default:
                                // Unknown sub-sample for acquiring new secret.
                                // If we wanted to be fascist, we could now do
                                //  CssmError::throwMe(CSSM_ERRCODE_SAMPLE_VALUE_NOT_SUPPORTED);
                                // But instead we try to be tolerant and continue on.
                                // This DOES however count as an explicit attempt at specifying unlock,
                                // so we will no longer try the default case below...
                                secdebug("SSdb", "%p unknown sub-sample acquisition (%ld) ignored",
                                        this, sample.type());
                                break;
                        }
                }
        } else {
                // default action -- interactive (only)
                QueryNewPassphrase query(*this, reason);
        query.inferHints(Server::process());
                CssmAutoData passphrase(Allocator::standard(Allocator::sensitive));
                if (query(passphrase) == SecurityAgent::noReason) {
                        common().setup(NULL, passphrase);
                        return;
                }
        }
        
        // out of options - no secret obtained
        CssmError::throwMe(CSSM_ERRCODE_OPERATION_AUTH_DENIED);
}


//
// Given a (truncated) Database credentials TypedList specifying a master key,
// locate the key and return a reference to it.
//
CssmClient::Key KeychainDatabase::keyFromCreds(const TypedList &sample)
{
        // decode TypedList structure (sample type; Data:CSPHandle; Data:CSSM_KEY)
        assert(sample.type() == CSSM_WORDID_SYMMETRIC_KEY);
        if (sample.length() != 3
                || sample[1].type() != CSSM_LIST_ELEMENT_DATUM
                || sample[2].type() != CSSM_LIST_ELEMENT_DATUM)
                        CssmError::throwMe(CSSM_ERRCODE_INVALID_SAMPLE_VALUE);
        CSSM_CSP_HANDLE &handle = *sample[1].data().interpretedAs<CSSM_CSP_HANDLE>(CSSM_ERRCODE_INVALID_SAMPLE_VALUE);
        CssmKey &key = *sample[2].data().interpretedAs<CssmKey>(CSSM_ERRCODE_INVALID_SAMPLE_VALUE);

        if (key.header().cspGuid() == gGuidAppleCSPDL) {
                // handleOrKey is a SecurityServer KeyHandle; ignore key argument
                return myKey(Server::key(handle));
        } else {
                // not a KeyHandle reference; use key as a raw key
                if (key.header().blobType() != CSSM_KEYBLOB_RAW)
                        CssmError::throwMe(CSSMERR_CSP_INVALID_KEY_REFERENCE);
                if (key.header().keyClass() != CSSM_KEYCLASS_SESSION_KEY)
                        CssmError::throwMe(CSSMERR_CSP_INVALID_KEY_CLASS);
                return CssmClient::Key(Server::csp(), key, true);
        }
}


//
// Verify a putative database passphrase.
// If the database is already unlocked, just check the passphrase.
// Otherwise, unlock with that passphrase and report success.
// Caller must hold the common lock.
//
bool KeychainDatabase::validatePassphrase(const CssmData &passphrase) const
{
        if (common().hasMaster()) {
                // verify against known secret
                return common().validatePassphrase(passphrase);
        } else {
                // no master secret - perform "blind" unlock to avoid actual unlock
                try {
                        DatabaseCryptoCore test;
                        test.setup(mBlob, passphrase);
                        test.decodeCore(mBlob, NULL);
                        return true;
                } catch (...) {
                        return false;
                }
        }
}


//
// Lock this database
//
void KeychainDatabase::lockDb()
{
    common().lockDb();
}


//
// Given a Key for this database, encode it into a blob and return it.
//
KeyBlob *KeychainDatabase::encodeKey(const CssmKey &key, const CssmData &pubAcl, const CssmData &privAcl)
{
    unlockDb();
    
    // tell the cryptocore to form the key blob
    return common().encodeKeyCore(key, pubAcl, privAcl);
}


//
// Given a "blobbed" key for this database, decode it into its real
// key object and (re)populate its ACL.
//
void KeychainDatabase::decodeKey(KeyBlob *blob, CssmKey &key, void * &pubAcl, void * &privAcl)
{
    unlockDb();                                                 // we need our keys

    common().decodeKeyCore(blob, key, pubAcl, privAcl);
    // memory protocol: pubAcl points into blob; privAcl was allocated
        
    activity();
}


//
// Modify database parameters
//
void KeychainDatabase::setParameters(const DBParameters &params)
{
        StLock<Mutex> _(common());
    makeUnlocked();
        common().mParams = params;
    common().version++;         // invalidate old blobs
    activity();
        secdebug("SSdb", "%p common %p(%s) set params=(%ld,%d)",
                this, &common(), dbName(), params.idleTimeout, params.lockOnSleep);
}


//
// Retrieve database parameters
//
void KeychainDatabase::getParameters(DBParameters &params)
{
        StLock<Mutex> _(common());
    makeUnlocked();
        params = common().mParams;
    //activity();               // getting parameters does not reset the idle timer
}


//
// Intercept ACL change requests and reset blob validity
//
void KeychainDatabase::instantiateAcl()
{
        StLock<Mutex> _(common());
        makeUnlocked();
}

void KeychainDatabase::changedAcl()
{
        StLock<Mutex> _(common());
        version = 0;
}

const Database *KeychainDatabase::relatedDatabase() const
{ return this; }


//
// Debugging support
//
#if defined(DEBUGDUMP)

void KeychainDbCommon::dumpNode()
{
        PerSession::dumpNode();
        uint32 sig; memcpy(&sig, &mIdentifier.signature(), sizeof(sig));
        Debug::dump(" %s[%8.8lx]", mIdentifier.dbName(), sig);
        if (isLocked()) {
                Debug::dump(" locked");
        } else {
                time_t whenTime = time_t(when());
                Debug::dump(" unlocked(%24.24s/%.2g)", ctime(&whenTime),
                        (when() - Time::now()).seconds());
        }
        Debug::dump(" params=(%ld,%d)", mParams.idleTimeout, mParams.lockOnSleep);
}

void KeychainDatabase::dumpNode()
{
        PerProcess::dumpNode();
        Debug::dump(" %s vers=%ld",
                mValidData ? " data" : " nodata", version);
        if (mBlob) {
                uint32 sig; memcpy(&sig, &mBlob->randomSignature, sizeof(sig));
                Debug::dump(" blob=%p[%8.8lx]", mBlob, sig);
        } else {
                Debug::dump(" noblob");
        }
}

#endif //DEBUGDUMP


//
// DbCommon basic features
//
KeychainDbCommon::KeychainDbCommon(Session &ssn, const DbIdentifier &id)
        : DbCommon(ssn), mIdentifier(id), sequence(0), version(1),
      mIsLocked(true), mValidParams(false)
{ }

KeychainDbCommon::~KeychainDbCommon()
{
        secdebug("SSdb", "DbCommon %p destroyed", this);

        // explicitly unschedule ourselves
        Server::active().clearTimer(this);
}


void KeychainDbCommon::makeNewSecrets()
{
        // we already have a master key (right?)
        assert(hasMaster());

        // tell crypto core to generate the use keys
        DatabaseCryptoCore::generateNewSecrets();
        
        // we're now officially "unlocked"; set the timer
        setUnlocked();
        activity();                     // set lock timer
}


//
// All unlocking activity ultimately funnels through this method.
// This unlocks a DbCommon using the secrets setup in its crypto core
// component, and performs all the housekeeping needed to represent
// the state change.
// Returns true if unlock was successful, false if it failed due to
// invalid/insufficient secrets. Throws on other errors.
//
bool KeychainDbCommon::unlockDb(DbBlob *blob, void **privateAclBlob)
{
        try {
                // Tell the cryptocore to (try to) decode itself. This will fail
                // in an astonishing variety of ways if the passphrase is wrong.
                assert(hasMaster());
                decodeCore(blob, privateAclBlob);
                secdebug("SSdb", "%p unlock successful", this);
        } catch (...) {
                secdebug("SSdb", "%p unlock failed", this);
                return false;
        }
        
        // get the database parameters only if we haven't got them yet
        if (!mValidParams) {
                mParams = blob->params;
                n2hi(mParams.idleTimeout);
                mValidParams = true;    // sticky
        }

        setUnlocked();          // mark unlocked
        activity();                     // set lock timer
        
        // broadcast unlock notification
        notify(kNotificationEventUnlocked);
    return true;
}

void KeychainDbCommon::setUnlocked()
{
        session().addReference(*this); // active/held
        mIsLocked = false;  // mark unlocked
}


void KeychainDbCommon::lockDb(bool forSleep)
{
    StLock<Mutex> locker(*this);
    if (!isLocked()) {
        if (forSleep && !mParams.lockOnSleep)
            return;     // it doesn't want to

                DatabaseCryptoCore::invalidate();
        notify(kNotificationEventLocked);
                Server::active().clearTimer(this);

                mIsLocked = true;               // mark locked
                locker.unlock();                // release DbCommon lock now
                session().removeReference(*this); // remove active/hold
    }
}


DbBlob *KeychainDbCommon::encode(KeychainDatabase &db)
{
    assert(!isLocked());        // must have been unlocked by caller
    
    // export database ACL to blob form
    CssmData pubAcl, privAcl;
    db.exportBlob(pubAcl, privAcl);
    
    // tell the cryptocore to form the blob
    DbBlob form;
    form.randomSignature = identifier();
    form.sequence = sequence;
    form.params = mParams;
        h2ni(form.params.idleTimeout);
        
        assert(hasMaster());
    DbBlob *blob = encodeCore(form, pubAcl, privAcl);
    
    // clean up and go
    db.allocator.free(pubAcl);
    db.allocator.free(privAcl);
        return blob;
}


//
// Send a keychain-related notification event about this keychain
//
void KeychainDbCommon::notify(NotificationEvent event)
{
        // form the data (encoded DLDbIdentifier)
    NameValueDictionary nvd;
    NameValueDictionary::MakeNameValueDictionaryFromDLDbIdentifier(identifier(), nvd);
    CssmData data;
    nvd.Export(data);

        // inject notification into Security event system
    Listener::notify(kNotificationDomainDatabase, event, data);
        
        // clean up
    free (data.data());
}


//
// Perform deferred lock processing for a database.
//
void KeychainDbCommon::action()
{
        secdebug("SSdb", "common %s(%p) locked by timer", dbName(), this);
        lockDb();
}

void KeychainDbCommon::activity()
{
    if (!isLocked()) {
                secdebug("SSdb", "setting DbCommon %p timer to %d",
                        this, int(mParams.idleTimeout));
                Server::active().setTimer(this, Time::Interval(int(mParams.idleTimeout)));
        }
}

void KeychainDbCommon::sleepProcessing()
{
        lockDb(true);
}