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/**
* Provides modules for performing local (intra-procedural) and
* global (inter-procedural) taint-tracking analyses.
*/
private import DataFlow as DF
private import internal.DataFlowImpl
private import internal.DataFlowImplStage1
private import codeql.util.Location
/**
* Provides language-specific taint-tracking parameters.
*/
signature module InputSig<LocationSig Location, DF::InputSig<Location> Lang> {
/**
* Holds if `node` should be a sanitizer in all global taint flow configurations
* but not in local taint.
*/
predicate defaultTaintSanitizer(Lang::Node node);
/**
* Holds if the additional step from `src` to `sink` should be included in all
* global taint flow configurations.
*/
predicate defaultAdditionalTaintStep(Lang::Node src, Lang::Node sink, string model);
/**
* Holds if taint flow configurations should allow implicit reads of `c` at sinks
* and inputs to additional taint steps defined in the flow `Config`.
*
* Note that this (deliberately) does not include at additional taint steps defined
* globally in `defaultAdditionalTaintStep`. These models are expected to be precise
* and therefore to not require implicit reads.
*/
bindingset[node]
predicate defaultImplicitTaintRead(Lang::Node node, Lang::ContentSet c);
/**
* Holds if the additional step from `src` to `sink` should be considered in
* speculative taint flow exploration.
*/
predicate speculativeTaintStep(Lang::Node src, Lang::Node sink);
}
/**
* Construct the modules for taint-tracking analyses.
*/
module TaintFlowMake<
LocationSig Location, DF::InputSig<Location> DataFlowLang,
InputSig<Location, DataFlowLang> TaintTrackingLang>
{
private import TaintTrackingLang
private import DF::DataFlowMake<Location, DataFlowLang> as DataFlow
private import MakeImpl<Location, DataFlowLang> as DataFlowInternal
private import MakeImplStage1<Location, DataFlowLang> as DataFlowInternalStage1
private module AddTaintDefaults<DataFlowInternal::FullStateConfigSig Config> implements
DataFlowInternal::FullStateConfigSig
{
import Config
predicate isBarrier(DataFlowLang::Node node) {
Config::isBarrier(node) or defaultTaintSanitizer(node)
}
predicate isAdditionalFlowStep(DataFlowLang::Node node1, DataFlowLang::Node node2, string model) {
Config::isAdditionalFlowStep(node1, node2, model) or
defaultAdditionalTaintStep(node1, node2, model)
}
predicate allowImplicitRead(DataFlowLang::Node node, DataFlowLang::ContentSet c) {
Config::allowImplicitRead(node, c)
or
(
Config::isSink(node) or
Config::isSink(node, _) or
Config::isAdditionalFlowStep(node, _, _) or
Config::isAdditionalFlowStep(node, _, _, _, _)
) and
defaultImplicitTaintRead(node, c)
}
}
/**
* Constructs a global taint tracking computation.
*/
module Global<DataFlow::ConfigSig Config> implements DataFlow::GlobalFlowSig {
private module Config0 implements DataFlowInternal::FullStateConfigSig {
import DataFlowInternal::DefaultState<Config>
import Config
predicate isAdditionalFlowStep(
DataFlowLang::Node node1, DataFlowLang::Node node2, string model
) {
Config::isAdditionalFlowStep(node1, node2) and model = "Config"
}
}
private module C implements DataFlowInternal::FullStateConfigSig {
import AddTaintDefaults<Config0>
}
private module Stage1 = DataFlowInternalStage1::ImplStage1<C>;
import Stage1::PartialFlow
private module Flow = DataFlowInternal::Impl<C, Stage1::Stage1NoState>;
import Flow
}
/**
* Constructs a global taint tracking computation using flow state.
*/
module GlobalWithState<DataFlow::StateConfigSig Config> implements DataFlow::GlobalFlowSig {
private module Config0 implements DataFlowInternal::FullStateConfigSig {
import Config
predicate isAdditionalFlowStep(
DataFlowLang::Node node1, DataFlowLang::Node node2, string model
) {
Config::isAdditionalFlowStep(node1, node2) and model = "Config"
}
predicate isAdditionalFlowStep(
DataFlowLang::Node node1, FlowState state1, DataFlowLang::Node node2, FlowState state2,
string model
) {
Config::isAdditionalFlowStep(node1, state1, node2, state2) and model = "Config"
}
}
private module C implements DataFlowInternal::FullStateConfigSig {
import AddTaintDefaults<Config0>
}
private module Stage1 = DataFlowInternalStage1::ImplStage1<C>;
import Stage1::PartialFlow
private module Flow = DataFlowInternal::Impl<C, Stage1::Stage1WithState>;
import Flow
}
signature int speculationLimitSig();
private module AddSpeculativeTaintSteps<
DataFlowInternal::FullStateConfigSig Config, speculationLimitSig/0 speculationLimit> implements
DataFlowInternal::FullStateConfigSig
{
import Config
private predicate relevantState(Config::FlowState state) {
Config::isSource(_, state)
or
exists(Config::FlowState state0 |
relevantState(state0) and Config::isAdditionalFlowStep(_, state0, _, state, _)
)
}
private newtype TFlowState =
TMkFlowState(Config::FlowState state, int spec) {
relevantState(state) and spec = [0 .. speculationLimit()]
}
class FlowState extends TFlowState {
private Config::FlowState state;
private int spec;
FlowState() { this = TMkFlowState(state, spec) }
string toString() { result = "FlowState" }
Config::FlowState getState() { result = state }
int getSpec() { result = spec }
}
predicate isSource(DataFlowLang::Node source, FlowState state) {
Config::isSource(source, state.getState()) and state.getSpec() = 0
}
predicate isSink(DataFlowLang::Node sink, FlowState state) {
Config::isSink(sink, state.getState())
}
predicate isBarrier(DataFlowLang::Node node, FlowState state) {
Config::isBarrier(node, state.getState())
}
predicate isBarrierIn(DataFlowLang::Node node, FlowState state) {
Config::isBarrierIn(node, state.getState())
}
predicate isBarrierOut(DataFlowLang::Node node, FlowState state) {
Config::isBarrierOut(node, state.getState())
}
predicate isAdditionalFlowStep(
DataFlowLang::Node node1, FlowState state1, DataFlowLang::Node node2, FlowState state2,
string model
) {
Config::isAdditionalFlowStep(node1, state1.getState(), node2, state2.getState(), model) and
state1.getSpec() = state2.getSpec()
or
speculativeTaintStep(node1, node2) and
not defaultAdditionalTaintStep(node1, node2, _) and
not Config::isAdditionalFlowStep(node1, _, node2, _, _) and
not Config::isAdditionalFlowStep(node1, node2, _) and
model = "Speculative" and
state1.getSpec() + 1 = state2.getSpec() and
state1.getState() = state2.getState()
}
}
/**
* Constructs a global taint tracking computation that also allows a given
* maximum number of speculative taint steps.
*/
module SpeculativeGlobal<DataFlow::ConfigSig Config, speculationLimitSig/0 speculationLimit>
implements DataFlow::GlobalFlowSig
{
private module Config0 implements DataFlowInternal::FullStateConfigSig {
import DataFlowInternal::DefaultState<Config>
import Config
predicate isAdditionalFlowStep(
DataFlowLang::Node node1, DataFlowLang::Node node2, string model
) {
Config::isAdditionalFlowStep(node1, node2) and model = "Config"
}
}
private module C implements DataFlowInternal::FullStateConfigSig {
import AddTaintDefaults<AddSpeculativeTaintSteps<Config0, speculationLimit/0>>
}
private module Stage1 = DataFlowInternalStage1::ImplStage1<C>;
import Stage1::PartialFlow
private module Flow = DataFlowInternal::Impl<C, Stage1::Stage1WithState>;
import Flow
}
/**
* Constructs a global taint tracking computation using flow state that also
* allows a given maximum number of speculative taint steps.
*/
module SpeculativeGlobalWithState<
DataFlow::StateConfigSig Config, speculationLimitSig/0 speculationLimit> implements
DataFlow::GlobalFlowSig
{
private module Config0 implements DataFlowInternal::FullStateConfigSig {
import Config
predicate isAdditionalFlowStep(
DataFlowLang::Node node1, DataFlowLang::Node node2, string model
) {
Config::isAdditionalFlowStep(node1, node2) and model = "Config"
}
predicate isAdditionalFlowStep(
DataFlowLang::Node node1, FlowState state1, DataFlowLang::Node node2, FlowState state2,
string model
) {
Config::isAdditionalFlowStep(node1, state1, node2, state2) and model = "Config"
}
}
private module C implements DataFlowInternal::FullStateConfigSig {
import AddTaintDefaults<AddSpeculativeTaintSteps<Config0, speculationLimit/0>>
}
private module Stage1 = DataFlowInternalStage1::ImplStage1<C>;
import Stage1::PartialFlow
private module Flow = DataFlowInternal::Impl<C, Stage1::Stage1WithState>;
import Flow
}
}