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C#: Diff-informed queries: phase 3 (non-trivial locations) #20074

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C#: Diff-informed queries: phase 3 (non-trivial locations) #20074

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6c3345e
[DIFF-INFORMED] C#: ConditionalBypass
d10c Jul 16, 2025
ac27b42
[DIFF-INFORMED] C#: ExternalAPIs
d10c Jul 16, 2025
d556fc8
[DIFF-INFORMED] C#: UnsafeDeserializationQuery
d10c Jul 16, 2025
1f5d853
[DIFF-INFORMED] C#: ThreadUnsafeCryptoTransformLambda
d10c Jul 16, 2025
40aac5e
[DIFF-INFORMED] C#: HardcodedConnectionString
d10c Jul 16, 2025
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9 changes: 9 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/ConditionalBypassQuery.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,15 @@ private module ConditionalBypassConfig implements DataFlow::ConfigSig {
predicate isSink(DataFlow::Node sink) { sink instanceof Sink }

predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() { any() }

Location getASelectedSinkLocation(DataFlow::Node sink) {
result = sink.getLocation()
or
// from ConditionalBypass.ql
result = sink.(Sink).getSensitiveMethodCall().getLocation()
}
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/ExternalAPIsQuery.qll
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Expand Up @@ -78,6 +78,8 @@ private module RemoteSourceToExternalApiConfig implements DataFlow::ConfigSig {
predicate isSource(DataFlow::Node source) { source instanceof ActiveThreatModelSource }

predicate isSink(DataFlow::Node sink) { sink instanceof ExternalApiDataNode }

predicate observeDiffInformedIncrementalMode() { any() }
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This will also affect the output of cs/count-untrusted-data-external-api (if run in diff informed mode). However, this query is not included in any query suite, so this should be ok.

}

/** A module for tracking flow from `ActiveThreatModelSource`s to `ExternalApiDataNode`s. */
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24 changes: 24 additions & 0 deletions csharp/ql/lib/semmle/code/csharp/security/dataflow/UnsafeDeserializationQuery.qll
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Expand Up @@ -59,6 +59,10 @@ private module TaintToObjectMethodTrackingConfig implements DataFlow::ConfigSig
predicate isSink(DataFlow::Node sink) { sink instanceof InstanceMethodSink }

predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() {
any() // used in one of the disjuncts in UnsafeDeserializationUntrustedInput.ql
}
}

/**
Expand All @@ -77,6 +81,10 @@ private module JsonConvertTrackingConfig implements DataFlow::ConfigSig {
}

predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() {
any() // used in one of the disjuncts in UnsafeDeserializationUntrustedInput.ql
}
}

/**
Expand Down Expand Up @@ -133,6 +141,10 @@ private module TypeNameTrackingConfig implements DataFlow::ConfigSig {
)
)
}

predicate observeDiffInformedIncrementalMode() {
none() // Only used as secondary config in UnsafeDeserializationUntrustedInput.ql
}
}

/**
Expand All @@ -149,6 +161,10 @@ private module TaintToConstructorOrStaticMethodTrackingConfig implements DataFlo
predicate isSink(DataFlow::Node sink) { sink instanceof ConstructorOrStaticMethodSink }

predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }

predicate observeDiffInformedIncrementalMode() {
any() // used in one of the disjuncts in UnsafeDeserializationUntrustedInput.ql
}
}

/**
Expand Down Expand Up @@ -186,6 +202,10 @@ private module TaintToObjectTypeTrackingConfig implements DataFlow::ConfigSig {
oc.getObjectType() instanceof StrongTypeDeserializer
)
}

predicate observeDiffInformedIncrementalMode() {
none() // only used as secondary config in UnsafeDeserializationUntrustedInput.ql
}
}

/**
Expand All @@ -210,6 +230,10 @@ private module WeakTypeCreationToUsageTrackingConfig implements DataFlow::Config
sink.asExpr() = mc.getQualifier()
)
}

predicate observeDiffInformedIncrementalMode() {
none() // only used as secondary config in UnsafeDeserializationUntrustedInput.ql
}
}

/**
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2 changes: 2 additions & 0 deletions csharp/ql/src/Likely Bugs/ThreadUnsafeICryptoTransformLambda.ql
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Expand Up @@ -24,6 +24,8 @@ module NotThreadSafeCryptoUsageIntoParallelInvokeConfig implements DataFlow::Con
}

predicate isSink(DataFlow::Node sink) { sink instanceof ParallelSink }

predicate observeDiffInformedIncrementalMode() { any() }
}

module NotThreadSafeCryptoUsageIntoParallelInvoke =
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6 changes: 6 additions & 0 deletions csharp/ql/src/Security Features/CWE-798/HardcodedConnectionString.ql
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Expand Up @@ -38,6 +38,12 @@ module ConnectionStringConfig implements DataFlow::ConfigSig {
}

predicate isBarrier(DataFlow::Node node) { node instanceof StringFormatSanitizer }

predicate observeDiffInformedIncrementalMode() { any() }

Location getASelectedSinkLocation(DataFlow::Node sink) {
any(Call call | call.getAnArgument() = sink.asExpr()).getLocation() = result
}
}

/**
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