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/*
* 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 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 "DatabaseAuthorizer.h"
#include <wtf/text/WTFString.h>
namespace WebCore {
Ref<DatabaseAuthorizer> DatabaseAuthorizer::create(const String& databaseInfoTableName)
{
return adoptRef(*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&, const String&)
{
return SQLAuthDeny;
}
int DatabaseAuthorizer::dropVTable(const String&, const String&)
{
return SQLAuthDeny;
}
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 (equalIgnoringASCIICase(tableName, "sqlite_master")
// || equalIgnoringASCIICase(tableName, "sqlite_temp_master")
// || equalIgnoringASCIICase(tableName, "sqlite_sequence")
// || equalIgnoringASCIICase(tableName, Database::databaseInfoTableName()))
// return SQLAuthDeny;
if (equalIgnoringASCIICase(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