/**
 * @name SQL query built from user-controlled sources
 * @description Building a SQL query from user-controlled sources is vulnerable to insertion of
 *              malicious SQL code by the user.
 * @kind path-problem
 * @problem.severity error
 * @precision high
 * @id py/sql-injection
 * @tags security
 *       external/cwe/cwe-089
 *       external/owasp/owasp-a1
 */

import python
import semmle.python.security.Paths

/* Sources */
import semmle.python.web.HttpRequest

/* Sinks */
import semmle.python.security.injection.Sql
import semmle.python.web.django.Db
import semmle.python.web.django.Model

class SQLInjectionConfiguration extends TaintTracking::Configuration {

    SQLInjectionConfiguration() { this = "SQL injection configuration" }

    override predicate isSource(TaintTracking::Source source) {
        source instanceof HttpRequestTaintSource
    }

    override predicate isSink(TaintTracking::Sink sink) { sink instanceof SqlInjectionSink }

}

/* Additional configuration to support tracking of DB objects. Connections, cursors, etc. */
class DbConfiguration extends TaintTracking::Configuration {

    DbConfiguration() { this = "DB configuration" }

    override predicate isSource(TaintTracking::Source source) {
        source instanceof DjangoModelObjects or
        source instanceof DbConnectionSource
    }

}

from SQLInjectionConfiguration config, TaintedPathSource src, TaintedPathSink sink
where config.hasFlowPath(src, sink)
select sink.getSink(), src, sink, "This SQL query depends on $@.", src.getSource(), "a user-provided value"