Add support for "meta issuers". #223
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These are separate from the fixed OIDC issuers, and they represent templates for *classes* of OIDC endpoints that we want to support, e.g. for EKS: ``` https://oidc.eks.*.amazonaws.com/id/* ``` The `*` character here will be used to match `[a-zA-Z0-9_-]+`, so no host or path delimiting characters are allowed to prevent attacks like: ``` https://oidc.eks.mattmoor.io/pwned.amazonaws.com/id/does-not-matter ``` We do NOT maintain OIDC verifiers for all of the possible endpoints, but we do keep an LRU cache to avoid the expensive discovery process on each request. Related: sigstore#212 Signed-off-by: Matt Moore <mattomata@gmail.com>
mattmoor
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dlorenc
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Oct 28, 2021
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Let's hold this for @bobcallaway to take a look too, but I like it. |
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I wanna get this fix in, and then I'll rebase this: #224 |
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I'm thinking about even making the config use |
bobcallaway
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Oct 28, 2021
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| // Look in the LRU cache for a verifier | ||
| untyped, ok := fc.lru.Get(issuerURL) |
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I think we're covered by the OIDC lib in case the keys rotate; just noting this in case for some reason it doesn't.
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I believe the OIDC lib internally handles caching/rotating for a particular discovery endpoint, but since each of these "meta" things are N endpoints (where N is possibly O(XXX,XXX)!) I wanted some sort of eviction strategy.
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These are separate from the fixed OIDC issuers, and they represent templates for classes of OIDC endpoints that we want to support, e.g. for EKS:
The
*character here will be used to match[a-zA-Z0-9_-]+, so no host or path delimiting characters are allowed to prevent attacks like:We do NOT maintain OIDC verifiers for all of the possible endpoints, but we do keep an LRU cache to avoid the expensive discovery process on each request.
Related: #212
Signed-off-by: Matt Moore mattomata@gmail.com
WIP until #222 lands, and I may add the GKE/EKS stuff to this change.
Release Note