Add JWT client authentication for OAuth token requests - #2202
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Pull request overview
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Adds JWT-based client authentication (RFC 7523) for OAuth2/OpenID token requests, including configuration binding, request shaping, fail-closed behavior, and documentation updates.
Changes:
- Add
client_secret_jwt/private_key_jwttoken endpoint auth support with per-request JWT assertions. - Introduce
token.client-assertion.*andopenid.token.client-assertion.*configuration (lifetime, aud/iss/sub, alg, signer). - Add tests covering request shaping, misconfiguration failures, signer selection, and embedded token endpoint handling.
Reviewed changes
Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.
Show a summary per file
| File | Description |
|---|---|
| src/main/docs/guide/oauth/flows/authorization-code/openid-authorization-code/openid-configuration.adoc | Documents OpenID token endpoint JWT client assertion configuration and includes generated config properties docs. |
| src/main/docs/guide/oauth/flows/authorization-code/oauth2-authorization-code/oauth2-configuration.adoc | Documents OAuth2 token endpoint JWT client assertion configuration and adds config properties include. |
| security-oauth2/src/main/java/io/micronaut/security/oauth2/endpoint/token/request/DefaultTokenEndpointClient.java | Adds client-assertion authentication handling and optional generator integration into token request securing. |
| security-oauth2/src/main/java/io/micronaut/security/oauth2/endpoint/token/request/JwtClientAssertionGenerator.java | Implements JWT client assertion creation/signing for client_secret_jwt and private_key_jwt. |
| security-oauth2/src/main/java/io/micronaut/security/oauth2/configuration/endpoints/TokenEndpointConfiguration.java | Extends token endpoint configuration interface with optional client assertion configuration. |
| security-oauth2/src/main/java/io/micronaut/security/oauth2/configuration/endpoints/ClientAssertionConfiguration.java | Adds a dedicated configuration interface for JWT client assertions. |
| security-oauth2/src/main/java/io/micronaut/security/oauth2/configuration/OauthClientConfigurationProperties.java | Binds client-assertion configuration under both OAuth2 and OpenID token endpoint config properties. |
| security-oauth2/src/test/java/io/micronaut/security/oauth2/endpoint/token/request/DefaultTokenEndpointClientClientAssertionTest.java | Adds tests for JWT client assertion behavior across auth methods and failure modes, including an embedded server test. |
| security-oauth2/src/test/java/io/micronaut/security/oauth2/configuration/OauthClientConfigurationTest.java | Adds config binding test coverage for token.client-assertion.*. |
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Summary
client_secret_jwtandprivate_key_jwt.token.client-assertion.*andopenid.token.client-assertion.*configuration for lifetime, audience, issuer, subject, signing algorithm, and signer selection.jti, embedded token endpoint handling, and docs for OAuth/OpenID configuration.Release Target
5.1.x5.1.05.1.0 Releasetype: enhancementTests
git diff --check origin/5.1.x...HEAD./gradlew :micronaut-security-oauth2:test --tests 'io.micronaut.security.oauth2.endpoint.token.request.DefaultTokenEndpointClientClientAssertionTest' --rerun-tasksPR Assets
None. This change updates source, tests, and AsciiDoc documentation only; no rendered screenshots, PDFs, logs, archives, or generated binary artifacts are required.
Closes #1511
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