Fix NPE in auditing authenticationSuccess for non-existing run-as user (#91171) #91240
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elastic#91171) When run-as fails because the target user does not exist, the authentication is created with a null lookup realm. It is then rejected at authorization time. But for authentication, it is treated as success. This can lead to NPE when auditing the authenticationSuccess event. This PR fixes the NPE by checking whether lookup realm is null before using it. Relates: elastic#91126 (comment)
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When run-as fails because the target user does not exist, the authentication is created with a null lookup realm. It is then rejected at authorization time. But for authentication, it is treated as success. This can lead to NPE when auditing the authenticationSuccess event.
This PR fixes the NPE by checking whether lookup realm is null before using it.
Relates: #91126 (comment)
Backport: #91171