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| Original file line number | Diff line number | Diff line change |
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| FROM eclipse-temurin:17.0.11_9-jre | ||
| FROM eclipse-temurin:17.0.12_7-jre | ||
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| LABEL org.opencontainers.image.authors="Fraunhofer AISEC <[email protected]>" | ||
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117 changes: 117 additions & 0 deletions
117
.../main/kotlin/de/fraunhofer/aisec/codyze/backends/cpg/coko/evaluators/ArgumentEvaluator.kt
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| /* | ||
| * Copyright (c) 2024, Fraunhofer AISEC. All rights reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package de.fraunhofer.aisec.codyze.backends.cpg.coko.evaluators | ||
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| import de.fraunhofer.aisec.codyze.backends.cpg.coko.CokoCpgBackend | ||
| import de.fraunhofer.aisec.codyze.backends.cpg.coko.CpgFinding | ||
| import de.fraunhofer.aisec.codyze.backends.cpg.coko.dsl.cpgGetAllNodes | ||
| import de.fraunhofer.aisec.codyze.specificationLanguages.coko.core.EvaluationContext | ||
| import de.fraunhofer.aisec.codyze.specificationLanguages.coko.core.Evaluator | ||
| import de.fraunhofer.aisec.codyze.specificationLanguages.coko.core.Finding | ||
| import de.fraunhofer.aisec.codyze.specificationLanguages.coko.core.dsl.Op | ||
| import de.fraunhofer.aisec.cpg.graph.declarations.VariableDeclaration | ||
| import de.fraunhofer.aisec.cpg.graph.followPrevEOGEdgesUntilHit | ||
| import de.fraunhofer.aisec.cpg.graph.statements.expressions.CallExpression | ||
| import de.fraunhofer.aisec.cpg.graph.statements.expressions.Expression | ||
| import de.fraunhofer.aisec.cpg.graph.statements.expressions.Literal | ||
| import de.fraunhofer.aisec.cpg.graph.statements.expressions.Reference | ||
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| context(CokoCpgBackend) | ||
| class ArgumentEvaluator(val targetCall: Op, val argPos: Int, val originCall: Op) : Evaluator { | ||
| override fun evaluate(context: EvaluationContext): List<CpgFinding> { | ||
| // Get all good calls and the associated variables | ||
| val originCalls = originCall.cpgGetAllNodes() | ||
| val variables = originCalls.mapNotNull { | ||
| it.tryGetVariableDeclaration() | ||
| } | ||
| val findings = mutableListOf<CpgFinding>() | ||
| // Get all target calls using the variable and check whether it is in a good state | ||
| val targetCalls = targetCall.cpgGetAllNodes() | ||
| for (call in targetCalls) { | ||
| val arg: VariableDeclaration? = | ||
| (call.arguments.getOrNull(argPos) as? Reference)?.refersTo as? VariableDeclaration | ||
| if (arg in variables && arg?.allowsInvalidPaths(originCalls.toList(), call) == false) { | ||
| findings.add( | ||
| CpgFinding( | ||
| message = "Complies with rule: " + | ||
| "arg $argPos of \"${call.code}\" stems from a call to \"$originCall\"", | ||
| kind = Finding.Kind.Pass, | ||
| node = call, | ||
| relatedNodes = listOfNotNull(originCalls.firstOrNull { it.tryGetVariableDeclaration() == arg }) | ||
| ) | ||
| ) | ||
| } else { | ||
| findings.add( | ||
| CpgFinding( | ||
| message = "Violation against rule: " + | ||
| "arg $argPos of \"${call.code}\" does not stem from a call to \"$originCall\"", | ||
| kind = Finding.Kind.Fail, | ||
| node = call, | ||
| relatedNodes = listOf() | ||
| ) | ||
| ) | ||
| } | ||
| } | ||
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| return findings | ||
| } | ||
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| /** | ||
| * Tries to resolve which variable is modified by a CallExpression | ||
| * @return The VariableExpression modified by the CallExpression or null | ||
| */ | ||
| private fun CallExpression.tryGetVariableDeclaration(): VariableDeclaration? { | ||
| return when (val nextDFG = this.nextDFG.firstOrNull()) { | ||
| is VariableDeclaration -> nextDFG | ||
| is Reference -> nextDFG.refersTo as? VariableDeclaration | ||
| else -> null | ||
| } | ||
| } | ||
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| /** | ||
| * This method tries to get all possible CallExpressions that try to override the variable value | ||
| * @return The CallExpressions modifying the variable | ||
| */ | ||
| private fun VariableDeclaration.getOverrides(): List<Expression> { | ||
| val assignments = this.typeObservers.mapNotNull { (it as? Reference)?.prevDFG?.firstOrNull() } | ||
| // Consider overwrites caused by CallExpressions and Literals | ||
| return assignments.mapNotNull { | ||
| when (it) { | ||
| is CallExpression -> it | ||
| is Literal<*> -> it | ||
| else -> null | ||
| } | ||
| } | ||
| } | ||
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| /** | ||
| * This method checks whether there are any paths with forbidden values for the variable that end in the target call | ||
| * @param allowedCalls The calls that set the variable to an allowed value | ||
| * @param targetCall The target call using the variable as an argument | ||
| * @return whether there is at least one path that allows an invalid value for the variable to reach the target | ||
| */ | ||
| private fun VariableDeclaration.allowsInvalidPaths( | ||
| allowedCalls: List<CallExpression>, | ||
| targetCall: CallExpression | ||
| ): Boolean { | ||
| // Get every MemberCall that tries to override our variable, ignoring allowed calls | ||
| val interferingDeclarations = this.getOverrides().toMutableList() - allowedCalls.toSet() | ||
| // Check whether there is a path from any invalid call to our target call that is not overridden at least once | ||
| val targetToNoise = targetCall.followPrevEOGEdgesUntilHit { interferingDeclarations.contains(it) }.fulfilled | ||
| .filterNot { badPath -> allowedCalls.any { goodCall -> goodCall in badPath } } | ||
| return targetToNoise.isNotEmpty() | ||
| } | ||
| } |
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...src/main/kotlin/de/fraunhofer/aisec/codyze/backends/cpg/coko/evaluators/NeverEvaluator.kt
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