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63 lines
2.6 KiB
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63 lines
2.6 KiB
Text
[[modules-scripting-security]]
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== Scripting and security
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Painless and {es} implement layers of security to build a defense in depth
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strategy for running scripts safely.
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Painless uses a fine-grained allowlist. Anything that is not part of the
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allowlist results in a compilation error. This capability is the first layer of
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security in a defense in depth strategy for scripting.
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The second layer of security is the https://www.oracle.com/java/technologies/javase/seccodeguide.html[Java Security Manager]. As part of its startup
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sequence, {es} enables the Java Security Manager to limit the actions that
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portions of the code can take. <<modules-scripting-painless,Painless>> uses
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the Java Security Manager as an additional layer of defense to prevent scripts
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from doing things like writing files and listening to sockets.
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{es} uses
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{wikipedia}/Seccomp[seccomp] in Linux,
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https://www.chromium.org/developers/design-documents/sandbox/osx-sandboxing-design[Seatbelt]
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in macOS, and
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https://msdn.microsoft.com/en-us/library/windows/desktop/ms684147[ActiveProcessLimit]
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on Windows as additional security layers to prevent {es} from forking or
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running other processes.
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You can modify the following script settings to restrict the type of scripts
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that are allowed to run, and control the available
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{painless}/painless-contexts.html[contexts] that scripts can run in. To
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implement additional layers in your defense in depth strategy, follow the
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<<es-security-principles,{es} security principles>>.
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[[allowed-script-types-setting]]
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[discrete]
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=== Allowed script types setting
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{es} supports two script types: `inline` and `stored`. By default, {es} is
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configured to run both types of scripts. To limit what type of scripts are run,
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set `script.allowed_types` to `inline` or `stored`. To prevent any scripts from
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running, set `script.allowed_types` to `none`.
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IMPORTANT: If you use {kib}, set `script.allowed_types` to both or just `inline`.
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Some {kib} features rely on inline scripts and do not function as expected
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if {es} does not allow inline scripts.
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For example, to run `inline` scripts but not `stored` scripts:
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[source,yaml]
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----
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script.allowed_types: inline
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----
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[[allowed-script-contexts-setting]]
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[discrete]
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=== Allowed script contexts setting
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By default, all script contexts are permitted. Use the `script.allowed_contexts`
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setting to specify the contexts that are allowed. To specify that no contexts
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are allowed, set `script.allowed_contexts` to `none`.
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For example, to allow scripts to run only in `scoring` and `update` contexts:
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[source,yaml]
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----
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script.allowed_contexts: score, update
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----
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