Add missing string replacement sanitizers to log-injection and string-break #11910
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owen-mc
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Performance evaluation showed no changes |
| class StringsNewReplacerCall extends DataFlow::CallNode { | ||
| StringsNewReplacerCall() { this.getTarget().hasQualifiedName("strings", "NewReplacer") } | ||
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| /** | ||
| * Gets an argument to this call corresponding to a string that will be | ||
| * replaced. | ||
| */ | ||
| DataFlow::Node getAReplacedArgument() { | ||
| exists(int n | n % 2 = 0 and result = this.getArgument(n)) | ||
| } | ||
| } | ||
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| /** | ||
| * A configuration for tracking flow from a call to `strings.NewReplacer` to | ||
| * the receiver of a call to `strings.Replacer.Replace` or | ||
| * `strings.Replacer.WriteString`. | ||
| */ | ||
| class StringsNewReplacerConfiguration extends DataFlow2::Configuration { | ||
| StringsNewReplacerConfiguration() { this = "StringsNewReplacerConfiguration" } | ||
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| override predicate isSource(DataFlow::Node source) { source instanceof StringsNewReplacerCall } | ||
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| override predicate isSink(DataFlow::Node sink) { | ||
| exists(DataFlow::MethodCallNode call | | ||
| sink = call.getReceiver() and | ||
| call.getTarget().hasQualifiedName("strings", "Replacer", ["Replace", "WriteString"]) | ||
| ) | ||
| } | ||
| } |
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This part seems to be identical between LogInjectionCustomizations and StringBreakCustomizations. Would it make sense / be possible to de-duplicate this in a shared location?
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Good idea. It feels like something that should be usable in many different places. I've moved it to StringOps.qll, which should hopefully make that simple. I've started a performance evaluation as this is a fairly major change.
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The performance analysis was neutral.
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I've updated this to use its own copy of the dataflow library. The failing QLDoc test is because of an undocumented predicate in the dataflow library, which obviously I'm not going to fix in this PR, so I believe it should be ignored. |
Add
strings.Replacer.Replaceandstrings.Replacer.WriteStringas sanitizers for log-injection and string-break.This is a resurrection of github/codeql-go#731.