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third draft with category launcher and permission element excluded

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This commit is contained in:
Jami Cogswell
2022-08-05 01:16:59 -04:00
parent 8d5bbc458f
commit a6ecac6e00
2 changed files with 58 additions and 11 deletions
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58
java/ql/src/Security/CWE/CWE-926/ImplicitlyExportedAndroidComponent.ql
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@@ -13,16 +13,56 @@
import java
import semmle.code.xml.AndroidManifest
from AndroidComponentXmlElement compElem
// FIRST DRAFT
// from AndroidComponentXmlElement compElem
// where
// not compElem.hasAttribute("exported") and
// compElem.getAChild().hasName("intent-filter") and
// not compElem.hasAttribute("permission") and
// not compElem
// .getAnIntentFilterElement()
// .getAnActionElement()
// .getActionName()
// .matches("android.intent.action.MAIN") and // filter out anything that is android intent (e.g. don't just filter out MAIN) because I think those are fine (but need to look at docs to confirm)
// //not compElem.getAnIntentFilterElement().getAnActionElement().getActionName() = "android.intent.category.LAUNCHER" and // I should add this as well, but above will techincally filter out since they always seem to occur together
// not compElem.getFile().getRelativePath().matches("%build%") // switch to not isInBuildDirectory() once new predicate is merged into main
// select compElem, "This component is implicitly exported."
// SECOND DRAFT
// from AndroidComponentXmlElement compElem
// where
// // Does NOT have `exported` attribute
// not compElem.hasAttribute("exported") and
// // and DOES have an intent-filter (DOUBLE-CHECK THIS CODE AND CHECK AGAINST OTHER VERSIONS THAT SEEMED TO WORK THE SAME)
// compElem.getAChild().hasName("intent-filter") and // compElem.getAChild("intent-filter"); need hasComponent with exists(...) here?
// // and does NOT have `permission` attribute
// not compElem.hasAttribute("permission") and
// // and is NOT in build directory (NOTE: switch to not isInBuildDirectory() once new predicate is merged into main)
// not compElem.getFile().getRelativePath().matches("%build%") and
// // and does NOT have a LAUNCHER category, see docs: https://developer.android.com/about/versions/12/behavior-changes-12#exported
// // Constant Value: "android.intent.category.LAUNCHER" from https://developer.android.com/reference/android/content/Intent#CATEGORY_LAUNCHER
// // I think beloew is actually too coarse because there can be multiple intent-filters in one component, so 2nd intent-filter without the launcher
// // could maybe be an issue, e.g. https://github.com/microsoft/DynamicsWOM/blob/62c2dad4cbbd4496a55aa3f644336044105bb1c1/app/src/main/AndroidManifest.xml#L56-L66
// not compElem.getAnIntentFilterElement().getAChild("category").getAttributeValue("name") =
// "android.intent.category.LAUNCHER" // double-check this code (especially use of getAChild and pattern match with LAUNCHER (e.g. should I do .%LAUNCHER instead?--No, constant value per docs), etc.), and definitely need to add stuff to library for this; should use exists(...) here?
// select compElem, "This component is implicitly exported."
// THIRD DRAFT
from AndroidComponentXmlElement compElem, AndroidManifestXmlElement manifestElem
where
// Does NOT have `exported` attribute
not compElem.hasAttribute("exported") and
compElem.getAChild().hasName("intent-filter") and
// and DOES have an intent-filter (DOUBLE-CHECK THIS CODE AND CHECK AGAINST OTHER VERSIONS THAT SEEMED TO WORK THE SAME)
compElem.getAChild().hasName("intent-filter") and // compElem.getAChild("intent-filter"); need hasComponent with exists(...) here?
// and does NOT have `permission` attribute
not compElem.hasAttribute("permission") and
not compElem
.getAnIntentFilterElement()
.getAnActionElement()
.getActionName()
.matches("android.intent.action.%") and // filter out anything that is android intent (e.g. don't just filter out MAIN) because I think those are fine (but need to look at docs to confirm)
//not compElem.getAnIntentFilterElement().getAnActionElement().getActionName() = "android.intent.category.LAUNCHER" and // I should add this as well, but above will techincally filter out since they always seem to occur together
not compElem.getFile().getRelativePath().matches("%build%") // switch to not isInBuildDirectory() once new predicate is merged into main
// and is NOT in build directory (NOTE: switch to not isInBuildDirectory() once new predicate is merged into main)
not compElem.getFile().getRelativePath().matches("%build%") and
// and does NOT have a LAUNCHER category, see docs: https://developer.android.com/about/versions/12/behavior-changes-12#exported
// Constant Value: "android.intent.category.LAUNCHER" from https://developer.android.com/reference/android/content/Intent#CATEGORY_LAUNCHER
// I think beloew is actually filtering out too much because there can be multiple intent-filters in one component, so 2nd intent-filter without the launcher
// could maybe be an issue, e.g. https://github.com/microsoft/DynamicsWOM/blob/62c2dad4cbbd4496a55aa3f644336044105bb1c1/app/src/main/AndroidManifest.xml#L56-L66
not compElem.getAnIntentFilterElement().getAChild("category").getAttributeValue("name") =
"android.intent.category.LAUNCHER" and // double-check this code (especially use of getAChild and pattern match with LAUNCHER (e.g. should I do .%LAUNCHER instead?--No, constant value per docs), etc.), and definitely need to add stuff to library for this; should use exists(...) here?
// and NO <permission> element in manifest file since that will be applied to the component even if no `permission` attribute directly
// set on component per the docs:
not manifestElem.getAChild().hasName("permission")
select compElem, "This component is implicitly exported."