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feat: add support for specifying allowed OIDC JWT signing algorithms (#2753) (#2851)

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* feat: add support for specifying allowed OIDC JWT signing algorithms (#2753)

TODO:
- [X] update docs
- [X] add support in yaml (modern) config
- [X] add more test(s)?

Add (legacy for now) configuration flag "oidc-enabled-signing-alg" (cfg:
oidc_enabled_signing_algs) that allows setting what signing algorithms
are specified by provider in JWT header ("alg" header claim).

In particular useful when skip_oidc_discovery = true, as verifier
defaults to only accept "RS256" in alg field in such circumstances.

Signed-off-by: Jan Larwig <jan@larwig.com>

* doc: update changelog and alpha config

Signed-off-by: Jan Larwig <jan@larwig.com>

* feat: add signing algorithm intersection handling with oidc discovery and additional tests

Signed-off-by: Jan Larwig <jan@larwig.com>

---------

Signed-off-by: Jan Larwig <jan@larwig.com>
Co-authored-by: Jan Larwig <jan@larwig.com>
This commit is contained in:
andoks
2026-03-18 22:24:27 +08:00
committed by GitHub
co-authored by Jan Larwig
parent 30853098c7
commit 7c96234233
14 changed files with 363 additions and 11 deletions
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docs/docs/configuration/alpha_config.md
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@@ -488,6 +488,7 @@ character.
| `userIDClaim` | _string_ | UserIDClaim indicates which claim contains the user ID<br/>default set to 'email' |
| `audienceClaims` | _[]string_ | AudienceClaim allows to define any claim that is verified against the client id<br/>By default `aud` claim is used for verification. |
| `extraAudiences` | _[]string_ | ExtraAudiences is a list of additional audiences that are allowed<br/>to pass verification in addition to the client id. |
| `enabledSigningAlgs` | _[]string_ | EnabledSigningAlgs is a list of allowed JWT signing algorithms.<br/>When discovery is enabled, the effective set is the intersection<br/>between this list and the provider's discovered supported algorithms.<br/>By default `RS256` is used if nothing has been discovered or specified. |
### Provider
docs/docs/configuration/overview.md
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@@ -99,7 +99,8 @@ Provider specific options can be found on their respective subpages.
| flag: `--oidc-groups-claim`<br/>toml: `oidc_groups_claim` | string | which OIDC claim contains the user groups | `"groups"` |
| flag: `--oidc-issuer-url`<br/>toml: `oidc_issuer_url` | string | the OpenID Connect issuer URL, e.g. `"https://accounts.google.com"` | |
| flag: `--oidc-jwks-url`<br/>toml: `oidc_jwks_url` | string | OIDC JWKS URI for token verification; required if OIDC discovery is disabled and public key files are not provided | |
| flag: `--oidc-public-key-file`<br/>toml: `oidc_public_key_files` | string | Path to public key file in PEM format to use for verifying JWT tokens (may be given multiple times). Required if OIDC discovery is disabled na JWKS URL isn't provided | string \| list |
| flag: `--oidc-public-key-file`<br/>toml: `oidc_public_key_files` | string | Path to public key file in PEM format to use for verifying JWT tokens (may be given multiple times). Required if OIDC discovery is disabled na JWKS URL isn't provided | |
| flag: `--oidc-enabled-signing-alg`<br/>toml: `oidc_enabled_signing_algs` | string \| list | List of allowed JWT signing algorithms. When oidc discovery is enabled, the effective set is the intersection between this list and the provider's discovered supported algorithms. | |
| flag: `--profile-url`<br/>toml: `profile_url` | string | Profile access endpoint | |
| flag: `--prompt`<br/>toml: `prompt` | string | [OIDC prompt](https://openid.net/specs/openid-connect-core-1_0.html#AuthRequest); if present, `approval-prompt` is ignored | `""` |
| flag: `--provider-ca-file`<br/>toml: `provider_ca_files` | string \| list | Paths to CA certificates that should be used when connecting to the provider. If not specified, the default Go trust sources are used instead. |