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Implement constant-time secret comparisons in CEL. #492

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merged 1 commit into from
Mar 31, 2020
Merged

Implement constant-time secret comparisons in CEL. #492

merged 1 commit into from
Mar 31, 2020

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This adds new compareSecret overload for strings in CEL, allowing comparison of a value against a secret.

This addresses #486

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New CEL interceptor function `compareSecrets` for securely comparing strings to secrets in CEL expressions.

@tekton-robot tekton-robot added the size/L Denotes a PR that changes 100-499 lines, ignoring generated files. label Mar 20, 2020
@bigkevmcd bigkevmcd mentioned this pull request Mar 20, 2020
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/test pull-tekton-triggers-build-tests/

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/test pull-tekton-triggers-build-tests

dibyom
dibyom reviewed Mar 24, 2020
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Can we add an example with the secretCompare?

docs/cel_expressions.md Outdated
The event-listener service account must have access to the secret.
</td>
<td>
<pre>header.canonical('X-Secret-Token').compareSecret('namespace', 'secret-name', 'key')</pre>
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can the namespace be optional? In other interceptors, if one is not specified, it defaults to the EL's namespace.

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I implemented it with variable args, if you provide 3, the first is the namespace, only 2 and it defaults to the eventlistener's namespace.

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@dibyom dibyom Mar 30, 2020 •
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Ahh ok, that sounds good.
Thoughts on reversing the function params (key, secretName, ns) vs (ns, name, key) since the ns one is optional?

@bigkevmcd bigkevmcd force-pushed the cel-secret-access branch 2 times, most recently from 6f9932c to 38f2e7b Compare March 26, 2020 14:54
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/test pull-tekton-triggers-build-tests

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dibyom commented Mar 30, 2020

/approve

One minor thing about the optional namespace position in the function signature but other wise 👍

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dibyom

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@tekton-robot tekton-robot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Mar 30, 2020
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Implement constant-time secret comparisons in CEL.
0a85a35 
This adds new compareSecret overload for strings in CEL, allowing comparison of a value against a secret.
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dibyom commented Mar 31, 2020

/lgtm

@tekton-robot tekton-robot added the lgtm Indicates that a PR is ready to be merged. label Mar 31, 2020
@tekton-robot tekton-robot merged commit 57c4adb into tektoncd:master Mar 31, 2020
@dibyom dibyom mentioned this pull request Mar 31, 2020
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@bigkevmcd bigkevmcd deleted the cel-secret-access branch May 27, 2020 07:27
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