[release/6.0] Fixing regression for AuthType.Anonymous which leads to a NullReferenceException be thrown. #62824
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Tagging subscribers to this area: @dotnet/area-system-directoryservices, @jay98014 |
buyaa-n
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src/libraries/System.DirectoryServices.Protocols/src/System.DirectoryServices.Protocols.csproj
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| var connection = new LdapConnection("server"); | ||
| connection.AuthType = AuthType.Anonymous; | ||
| // When calling Bind we make sure that the exception thrown is not that there was a NullReferenceException | ||
| // trying to retrive a null password's lenght, but instead an LdapException given the server cannot be reached. |
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Just noticed a typo here: lenght
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Backport of #62807 to release/6.0
/cc @joperezr
Customer Impact
This PR is fixing a customer reported regression on this issue: #61683
The regression is present only on NuGet package System.DirectoryServices.Protocols version 6.0.0
The problem here is that if a consumer is running on Linux, and tries to Bind to a LDAP server using
AuthType.Anonymousthen we will throw aNullReferenceExceptiondue to a bug we have where we try to de-reference the user's password which in Anonymous case, will be null. There is no good workaround for this for using Anonymous AuthType today, other than downgrading the NuGet package version to 5.0.1 which doesn't have the regression.Testing
We've added unit test for regression coverage, and the fix has been validated by the customer that first reported the issue and said it fixed the issue for them. (cc. @JasonDebug)
Risk
Low. This is fixing a regression from 5.0->6.0 and currently we have no good workaround to avoid throwing NullReferenceException. The risks here are basically the same as shipping a new version of any of our NuGet packages.