/**
 * @name Code injection
 * @description Interpreting unsanitized user input as code allows a malicious user arbitrary
 *              code execution.
 * @kind path-problem
 * @problem.severity error
 * @sub-severity high
 * @precision high
 * @id py/code-injection
 * @tags security
 *       external/owasp/owasp-a1
 *       external/cwe/cwe-094
 *       external/cwe/cwe-095
 *       external/cwe/cwe-116
 */

import python
import semmle.python.security.Paths

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

/* Sinks */
import semmle.python.security.injection.Exec

class CodeInjectionConfiguration extends TaintTracking::Configuration {

    CodeInjectionConfiguration() { this = "Code injection configuration" }

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

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

}


from CodeInjectionConfiguration config, TaintedPathSource src, TaintedPathSink sink
where config.hasFlowPath(src, sink)
select sink.getSink(), src, sink, "$@ flows to here and is interpreted as code.", src.getSource(), "User-provided value"