fix(google-auth): fail loudly when dynamically disabling mTLS on active sessions - #18005
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gorthitk wants to merge 3 commits into
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fix(google-auth): fail loudly when dynamically disabling mTLS on active sessions#18005gorthitk wants to merge 3 commits into
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…ve sessions (googleapis#17761) When mTLS is previously enabled on an active transport session (requests, urllib3, or aiohttp), attempting to disable mTLS mid-lifecycle in configure_mtls_channel() now raises a MutualTLSChannelError instead of exiting early or replacing adapters. This prevents thread-safety violations from connection pool mutation and eliminates zombie state mismatches where active sessions continue sending client certificates while auth checks treat mTLS as disabled.
gorthitk
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This pull request prevents mid-lifecycle transitions from mTLS-enabled to mTLS-disabled states on active sessions across the aio, requests, and urllib3 transports by raising a MutualTLSChannelError. However, the review feedback highlights that raising this exception replaces historical graceful fallback behaviors (such as falling back to standard TLS or returning False), which introduces breaking changes for downstream users and violates backwards compatibility.
nbayati
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Aug 7, 2026
| # Prevent mid-lifecycle transition from mTLS-enabled to mTLS-disabled state. | ||
| if getattr(self, "_is_mtls", False) and not is_mtls: | ||
| raise exceptions.MutualTLSChannelError( | ||
| "Cannot disable mTLS on an active session. A new AuthorizedSession must be created." |
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Same here
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| "Cannot disable mTLS on an active session. A new AuthorizedSession must be created." | |
| "Cannot disable mTLS on an active session. A new AsyncAuthorizedSession must be created." |
parthea
marked this pull request as draft
August 10, 2026 19:17
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Hi @gorthitk, I'm going to mark this as draft since presubmits are failing but please feel free to mark it ready for review once checks are green |
added 2 commits
August 11, 2026 08:52
…tly in mTLS checks - Add _is_mtls_configured() helper across AuthorizedSession, AuthorizedHttp, and AsyncAuthorizedSession. - Inspect adapter types (_MutualTlsAdapter, _MutualTlsOffloadAdapter), PoolManager connection_pool_kw ssl_context, connector SSL context, and cached certificates directly. - Add unit tests verifying desynchronized state detection across all transports.
…yncAuthorizedSession
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When mTLS is previously enabled on an active transport session (requests, urllib3, or aiohttp), attempting to disable mTLS mid-lifecycle in configure_mtls_channel() now raises a MutualTLSChannelError instead of exiting early or replacing adapters.
This prevents thread-safety violations from connection pool mutation and eliminates zombie state mismatches where active sessions continue sending client certificates while auth checks treat mTLS as disabled.
Fixes #17761