fix(auth): configure mTLS for impersonated credentials#17404
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…resh Adds mTLS configuration to AuthorizedSession instances used in impersonated_credentials.py for `Credentials.sign_bytes` and `IDTokenCredentials.refresh`. This ensures that when impersonating credentials in environments enforcing mTLS, the client certificate is presented during the TLS handshake. Corresponding tests are added to verify this behavior. Co-authored-by: amtk3 <254821816+amtk3@users.noreply.github.com>
Adds mTLS configuration to AuthorizedSession instances used in impersonated_credentials.py for `Credentials.sign_bytes` and `IDTokenCredentials.refresh`. This ensures that when impersonating credentials in environments enforcing mTLS, the client certificate is presented during the TLS handshake. Corresponding tests are added to verify this behavior. Co-authored-by: amtk3 <254821816+amtk3@users.noreply.github.com>
…4737746463131592670 fix(auth): enable mTLS on AuthorizedSession in impersonated credentials
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This pull request configures mTLS channels on the authorized sessions used during byte signing and ID token refresh operations in impersonated_credentials.py. It also adds corresponding unit tests to verify that configure_mtls_channel is called. No review comments were provided, so there is no feedback to address.
Reformatted packages/google-auth/tests/test_impersonated_credentials.py with `black` to adhere to the project's formatting requirements and resolve the failing CI lint check. Co-authored-by: amtk3 <254821816+amtk3@users.noreply.github.com>
style: Reformat test_impersonated_credentials.py to fix black lint error
…4737746463131592670 style: Reformat test_impersonated_credentials.py to fix black lint error
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PR created by the Librarian CLI to initialize a release. Merging this PR will auto trigger a release. Librarian Version: v0.19.0 Language Image: us-central1-docker.pkg.dev/cloud-sdk-librarian-prod/images-prod/python-librarian-generator@sha256:234b9d1f2ddb057ed7ac6a38db0bf8163d839c65c6cf88ade52530cddebce59e <details><summary>gapic-generator: v1.35.0</summary> ## [v1.35.0](gapic-generator-v1.34.1...gapic-generator-v1.35.0) (2026-06-11) ### Features * setup.py matches prerelease versions (#17370) ([25b857e](25b857e1)) ### Bug Fixes * require protobuf 6.33.5 to address CVE-2026-0994 (#17349) ([6642263](66422636)) </details> <details><summary>google-auth: v2.54.0</summary> ## [v2.54.0](google-auth-v2.53.0...google-auth-v2.54.0) (2026-06-11) ### Features * implement regional access boundary support for standalone JWT and async service accounts (#17025) ([35af616](35af6168)) ### Bug Fixes * configure mTLS for impersonated credentials (#17404) ([57269d5](57269d56)) * fail-fast on missing ECP config file to avoid 30s hang (#17377) ([e096127](e0961270)) * Rename the 'seed' argument for setting an initial regional access boundary for clarity (#17186) ([e5c8cf9](e5c8cf92)) * update incorrect urls in setup.py to point at monorepo vs splitrepo (#17237) ([eaed04b](eaed04ba)) </details> <details><summary>google-cloud-alloydb: v0.11.0</summary> ## [v0.11.0](google-cloud-alloydb-v0.10.0...google-cloud-alloydb-v0.11.0) (2026-06-11) ### Features * update API sources and regenerate (#17413) ([59fe7cf](59fe7cf8)) </details> <details><summary>google-cloud-biglake: v0.5.0</summary> ## [v0.5.0](google-cloud-biglake-v0.4.0...google-cloud-biglake-v0.5.0) (2026-06-11) ### Features * update API sources and regenerate (#17431) ([2e75c78](2e75c78c)) </details> <details><summary>google-cloud-ces: v0.7.0</summary> ## [v0.7.0](google-cloud-ces-v0.6.0...google-cloud-ces-v0.7.0) (2026-06-11) ### Features * update API sources and regenerate (#17413) ([59fe7cf](59fe7cf8)) </details> <details><summary>google-cloud-confidentialcomputing: v0.11.0</summary> ## [v0.11.0](google-cloud-confidentialcomputing-v0.10.0...google-cloud-confidentialcomputing-v0.11.0) (2026-06-11) ### Features * update API sources and regenerate (#17413) ([59fe7cf](59fe7cf8)) </details> <details><summary>google-cloud-modelarmor: v0.7.0</summary> ## [v0.7.0](google-cloud-modelarmor-v0.6.0...google-cloud-modelarmor-v0.7.0) (2026-06-11) ### Features * update API sources and regenerate (#17413) ([59fe7cf](59fe7cf8)) </details> <details><summary>google-cloud-network-services: v0.10.0</summary> ## [v0.10.0](google-cloud-network-services-v0.9.0...google-cloud-network-services-v0.10.0) (2026-06-11) ### Features * update API sources and regenerate (#17431) ([2e75c78](2e75c78c)) </details> <details><summary>google-cloud-oracledatabase: v0.6.0</summary> ## [v0.6.0](google-cloud-oracledatabase-v0.5.0...google-cloud-oracledatabase-v0.6.0) (2026-06-11) ### Features * update API sources and regenerate (#17413) ([59fe7cf](59fe7cf8)) </details> <details><summary>google-cloud-spanner: v3.68.0</summary> ## [v3.68.0](google-cloud-spanner-v3.67.0...google-cloud-spanner-v3.68.0) (2026-06-11) ### Features * add asynchronous code snippets and minor cleanup changes (#17337) ([d6aaf61](d6aaf610)) ### Performance Improvements * optimize query result decoding (#17375) ([3f70b2f](3f70b2ff)) </details> <details><summary>google-cloud-storage: v3.12.0</summary> ## [v3.12.0](google-cloud-storage-v3.11.0...google-cloud-storage-v3.12.0) (2026-06-11) ### Features * full object checksum: implement rolling checksum and verification in reads resumption strategy (#17262) ([2361ba6](2361ba6e)) * Enable full object checksum PR 1/3 : parse finalize_time and server crc32c in async object stream (#17261) ([72c7a27](72c7a272)) * full object checksum: integrate full-object checksum in AsyncMultiRangeDownloader (#17263) ([b6a85e4](b6a85e49)) </details> <details><summary>google-developer-knowledge: v0.1.0</summary> ## [v0.1.0](google-developer-knowledge-v0.0.0...google-developer-knowledge-v0.1.0) (2026-06-11) ### Features * add google-developer-knowledge (#17417) ([ca02afc](ca02afce)) </details>
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Description
This PR configures
AuthorizedSessionto support mutual TLS (mTLS) when refreshing impersonated ID tokens or signing bytes.Context
When using impersonated credentials (e.g., via
gcloud auth print-identity-token --impersonate-service-account=...) in environments where mTLS is enforced by Context Aware Access (CAA) policies, the requests fail with401 UNAUTHENTICATED(specificallyACCESS_TOKEN_TYPE_UNSUPPORTED).Although the endpoint correctly resolves to the mTLS domain (
iamcredentials.mtls.googleapis.com), the underlyingAuthorizedSessioncreated inimpersonated_credentials.pyis never configured with the client certificate, causing the TLS handshake to lack the required client cert.Changes
google/auth/impersonated_credentials.py:authed_session.configure_mtls_channel()inCredentials.sign_bytesright after the session is created.authed_session.configure_mtls_channel()inIDTokenCredentials.refreshright after the session is created.tests/test_impersonated_credentials.py:test_sign_bytes_configures_mtlsandtest_id_token_refresh_configures_mtlsunit tests to verifyconfigure_mtls_channelis invoked.