Source/modules/webdatabase/DatabaseAuthorizer.cpp

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This source file includes following definitions.
create
m_databaseInfoTableName
reset
resetDeletes
addWhitelistedFunctions
createTable
createTempTable
dropTable
dropTempTable
allowAlterTable
createIndex
createTempIndex
dropIndex
dropTempIndex
createTrigger
createTempTrigger
dropTrigger
dropTempTrigger
createView
createTempView
dropView
dropTempView
createVTable
dropVTable
allowDelete
allowInsert
allowUpdate
allowTransaction
allowRead
allowReindex
allowAnalyze
allowPragma
allowAttach
allowDetach
allowFunction
disable
enable
allowWrite
setPermissions
denyBasedOnTableName
updateDeletesBasedOnTableName
/*
 * Copyright (C) 2007 Apple Inc. All rights reserved.
 *
 * 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.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS 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.
 */

#include "config.h"
#include "modules/webdatabase/DatabaseAuthorizer.h"

#include "wtf/PassRefPtr.h"

namespace WebCore {

PassRefPtrWillBeRawPtr<DatabaseAuthorizer> DatabaseAuthorizer::create(const String& databaseInfoTableName)
{
    return adoptRefWillBeNoop(new DatabaseAuthorizer(databaseInfoTableName));
}

DatabaseAuthorizer::DatabaseAuthorizer(const String& databaseInfoTableName)
    : m_securityEnabled(false)
    , m_databaseInfoTableName(databaseInfoTableName)
{
    reset();
    addWhitelistedFunctions();
}

void DatabaseAuthorizer::reset()
{
    m_lastActionWasInsert = false;
    m_lastActionChangedDatabase = false;
    m_permissions = ReadWriteMask;
}

void DatabaseAuthorizer::resetDeletes()
{
    m_hadDeletes = false;
}

void DatabaseAuthorizer::addWhitelistedFunctions()
{
    // SQLite functions used to help implement some operations
    // ALTER TABLE helpers
    m_whitelistedFunctions.add("sqlite_rename_table");
    m_whitelistedFunctions.add("sqlite_rename_trigger");
    // GLOB helpers
    m_whitelistedFunctions.add("glob");

    // SQLite core functions
    m_whitelistedFunctions.add("abs");
    m_whitelistedFunctions.add("changes");
    m_whitelistedFunctions.add("coalesce");
    m_whitelistedFunctions.add("glob");
    m_whitelistedFunctions.add("ifnull");
    m_whitelistedFunctions.add("hex");
    m_whitelistedFunctions.add("last_insert_rowid");
    m_whitelistedFunctions.add("length");
    m_whitelistedFunctions.add("like");
    m_whitelistedFunctions.add("lower");
    m_whitelistedFunctions.add("ltrim");
    m_whitelistedFunctions.add("max");
    m_whitelistedFunctions.add("min");
    m_whitelistedFunctions.add("nullif");
    m_whitelistedFunctions.add("quote");
    m_whitelistedFunctions.add("replace");
    m_whitelistedFunctions.add("round");
    m_whitelistedFunctions.add("rtrim");
    m_whitelistedFunctions.add("soundex");
    m_whitelistedFunctions.add("sqlite_source_id");
    m_whitelistedFunctions.add("sqlite_version");
    m_whitelistedFunctions.add("substr");
    m_whitelistedFunctions.add("total_changes");
    m_whitelistedFunctions.add("trim");
    m_whitelistedFunctions.add("typeof");
    m_whitelistedFunctions.add("upper");
    m_whitelistedFunctions.add("zeroblob");

    // SQLite date and time functions
    m_whitelistedFunctions.add("date");
    m_whitelistedFunctions.add("time");
    m_whitelistedFunctions.add("datetime");
    m_whitelistedFunctions.add("julianday");
    m_whitelistedFunctions.add("strftime");

    // SQLite aggregate functions
    // max() and min() are already in the list
    m_whitelistedFunctions.add("avg");
    m_whitelistedFunctions.add("count");
    m_whitelistedFunctions.add("group_concat");
    m_whitelistedFunctions.add("sum");
    m_whitelistedFunctions.add("total");

    // SQLite FTS functions
    m_whitelistedFunctions.add("match");
    m_whitelistedFunctions.add("snippet");
    m_whitelistedFunctions.add("offsets");
    m_whitelistedFunctions.add("optimize");

    // SQLite ICU functions
    // like(), lower() and upper() are already in the list
    m_whitelistedFunctions.add("regexp");
}

int DatabaseAuthorizer::createTable(const String& tableName)
{
    if (!allowWrite())
        return SQLAuthDeny;

    m_lastActionChangedDatabase = true;
    return denyBasedOnTableName(tableName);
}

int DatabaseAuthorizer::createTempTable(const String& tableName)
{
    // SQLITE_CREATE_TEMP_TABLE results in a UPDATE operation, which is not
    // allowed in read-only transactions or private browsing, so we might as
    // well disallow SQLITE_CREATE_TEMP_TABLE in these cases
    if (!allowWrite())
        return SQLAuthDeny;

    return denyBasedOnTableName(tableName);
}

int DatabaseAuthorizer::dropTable(const String& tableName)
{
    if (!allowWrite())
        return SQLAuthDeny;

    return updateDeletesBasedOnTableName(tableName);
}

int DatabaseAuthorizer::dropTempTable(const String& tableName)
{
    // SQLITE_DROP_TEMP_TABLE results in a DELETE operation, which is not
    // allowed in read-only transactions or private browsing, so we might as
    // well disallow SQLITE_DROP_TEMP_TABLE in these cases
    if (!allowWrite())
        return SQLAuthDeny;

    return updateDeletesBasedOnTableName(tableName);
}

int DatabaseAuthorizer::allowAlterTable(const String&, const String& tableName)
{
    if (!allowWrite())
        return SQLAuthDeny;

    m_lastActionChangedDatabase = true;
    return denyBasedOnTableName(tableName);
}

int DatabaseAuthorizer::createIndex(const String&, const String& tableName)
{
    if (!allowWrite())
        return SQLAuthDeny;

    m_lastActionChangedDatabase = true;
    return denyBasedOnTableName(tableName);
}

int DatabaseAuthorizer::createTempIndex(const String&, const String& tableName)
{
    // SQLITE_CREATE_TEMP_INDEX should result in a UPDATE or INSERT operation,
    // which is not allowed in read-only transactions or private browsing,
    // so we might as well disallow SQLITE_CREATE_TEMP_INDEX in these cases
    if (!allowWrite())
        return SQLAuthDeny;

    return denyBasedOnTableName(tableName);
}

int DatabaseAuthorizer::dropIndex(const String&, const String& tableName)
{
    if (!allowWrite())
        return SQLAuthDeny;

    return updateDeletesBasedOnTableName(tableName);
}

int DatabaseAuthorizer::dropTempIndex(const String&, const String& tableName)
{
    // SQLITE_DROP_TEMP_INDEX should result in a DELETE operation, which is
    // not allowed in read-only transactions or private browsing, so we might
    // as well disallow SQLITE_DROP_TEMP_INDEX in these cases
    if (!allowWrite())
        return SQLAuthDeny;

    return updateDeletesBasedOnTableName(tableName);
}

int DatabaseAuthorizer::createTrigger(const String&, const String& tableName)
{
    if (!allowWrite())
        return SQLAuthDeny;

    m_lastActionChangedDatabase = true;
    return denyBasedOnTableName(tableName);
}

int DatabaseAuthorizer::createTempTrigger(const String&, const String& tableName)
{
    // SQLITE_CREATE_TEMP_TRIGGER results in a INSERT operation, which is not
    // allowed in read-only transactions or private browsing, so we might as
    // well disallow SQLITE_CREATE_TEMP_TRIGGER in these cases
    if (!allowWrite())
        return SQLAuthDeny;

    return denyBasedOnTableName(tableName);
}

int DatabaseAuthorizer::dropTrigger(const String&, const String& tableName)
{
    if (!allowWrite())
        return SQLAuthDeny;

    return updateDeletesBasedOnTableName(tableName);
}

int DatabaseAuthorizer::dropTempTrigger(const String&, const String& tableName)
{
    // SQLITE_DROP_TEMP_TRIGGER results in a DELETE operation, which is not
    // allowed in read-only transactions or private browsing, so we might as
    // well disallow SQLITE_DROP_TEMP_TRIGGER in these cases
    if (!allowWrite())
        return SQLAuthDeny;

    return updateDeletesBasedOnTableName(tableName);
}

int DatabaseAuthorizer::createView(const String&)
{
    return (!allowWrite() ? SQLAuthDeny : SQLAuthAllow);
}

int DatabaseAuthorizer::createTempView(const String&)
{
    // SQLITE_CREATE_TEMP_VIEW results in a UPDATE operation, which is not
    // allowed in read-only transactions or private browsing, so we might as
    // well disallow SQLITE_CREATE_TEMP_VIEW in these cases
    return (!allowWrite() ? SQLAuthDeny : SQLAuthAllow);
}

int DatabaseAuthorizer::dropView(const String&)
{
    if (!allowWrite())
        return SQLAuthDeny;

    m_hadDeletes = true;
    return SQLAuthAllow;
}

int DatabaseAuthorizer::dropTempView(const String&)
{
    // SQLITE_DROP_TEMP_VIEW results in a DELETE operation, which is not
    // allowed in read-only transactions or private browsing, so we might as
    // well disallow SQLITE_DROP_TEMP_VIEW in these cases
    if (!allowWrite())
        return SQLAuthDeny;

    m_hadDeletes = true;
    return SQLAuthAllow;
}

int DatabaseAuthorizer::createVTable(const String& tableName, const String& moduleName)
{
    if (!allowWrite())
        return SQLAuthDeny;

    // Allow only the FTS3 extension
    if (!equalIgnoringCase(moduleName, "fts3"))
        return SQLAuthDeny;

    m_lastActionChangedDatabase = true;
    return denyBasedOnTableName(tableName);
}

int DatabaseAuthorizer::dropVTable(const String& tableName, const String& moduleName)
{
    if (!allowWrite())
        return SQLAuthDeny;

    // Allow only the FTS3 extension
    if (!equalIgnoringCase(moduleName, "fts3"))
        return SQLAuthDeny;

    return updateDeletesBasedOnTableName(tableName);
}

int DatabaseAuthorizer::allowDelete(const String& tableName)
{
    if (!allowWrite())
        return SQLAuthDeny;

    return updateDeletesBasedOnTableName(tableName);
}

int DatabaseAuthorizer::allowInsert(const String& tableName)
{
    if (!allowWrite())
        return SQLAuthDeny;

    m_lastActionChangedDatabase = true;
    m_lastActionWasInsert = true;
    return denyBasedOnTableName(tableName);
}

int DatabaseAuthorizer::allowUpdate(const String& tableName, const String&)
{
    if (!allowWrite())
        return SQLAuthDeny;

    m_lastActionChangedDatabase = true;
    return denyBasedOnTableName(tableName);
}

int DatabaseAuthorizer::allowTransaction()
{
    return m_securityEnabled ? SQLAuthDeny : SQLAuthAllow;
}

int DatabaseAuthorizer::allowRead(const String& tableName, const String&)
{
    if (m_permissions & NoAccessMask && m_securityEnabled)
        return SQLAuthDeny;

    return denyBasedOnTableName(tableName);
}

int DatabaseAuthorizer::allowReindex(const String&)
{
    return (!allowWrite() ? SQLAuthDeny : SQLAuthAllow);
}

int DatabaseAuthorizer::allowAnalyze(const String& tableName)
{
    return denyBasedOnTableName(tableName);
}

int DatabaseAuthorizer::allowPragma(const String&, const String&)
{
    return m_securityEnabled ? SQLAuthDeny : SQLAuthAllow;
}

int DatabaseAuthorizer::allowAttach(const String&)
{
    return m_securityEnabled ? SQLAuthDeny : SQLAuthAllow;
}

int DatabaseAuthorizer::allowDetach(const String&)
{
    return m_securityEnabled ? SQLAuthDeny : SQLAuthAllow;
}

int DatabaseAuthorizer::allowFunction(const String& functionName)
{
    if (m_securityEnabled && !m_whitelistedFunctions.contains(functionName))
        return SQLAuthDeny;

    return SQLAuthAllow;
}

void DatabaseAuthorizer::disable()
{
    m_securityEnabled = false;
}

void DatabaseAuthorizer::enable()
{
    m_securityEnabled = true;
}

bool DatabaseAuthorizer::allowWrite()
{
    return !(m_securityEnabled && (m_permissions & ReadOnlyMask || m_permissions & NoAccessMask));
}

void DatabaseAuthorizer::setPermissions(int permissions)
{
    m_permissions = permissions;
}

int DatabaseAuthorizer::denyBasedOnTableName(const String& tableName) const
{
    if (!m_securityEnabled)
        return SQLAuthAllow;

    // Sadly, normal creates and drops end up affecting sqlite_master in an authorizer callback, so
    // it will be tough to enforce all of the following policies
    //if (equalIgnoringCase(tableName, "sqlite_master") || equalIgnoringCase(tableName, "sqlite_temp_master") ||
    //    equalIgnoringCase(tableName, "sqlite_sequence") || equalIgnoringCase(tableName, Database::databaseInfoTableName()))
    //        return SQLAuthDeny;

    if (equalIgnoringCase(tableName, m_databaseInfoTableName))
        return SQLAuthDeny;

    return SQLAuthAllow;
}

int DatabaseAuthorizer::updateDeletesBasedOnTableName(const String& tableName)
{
    int allow = denyBasedOnTableName(tableName);
    if (allow)
        m_hadDeletes = true;
    return allow;
}

} // namespace WebCore
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root/Source/modules/webdatabase/DatabaseAuthorizer.cpp

DEFINITIONS
