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From "Michael Osipov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HTTPCLIENT-1686) Threadsafe CloseableHttpClient uses non-threadsafe NTLMScheme, causing errors
Date Tue, 13 Oct 2015 14:56:06 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-1686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14955067#comment-14955067
] 

Michael Osipov commented on HTTPCLIENT-1686:
--------------------------------------------

Ask {{svn blame}} and Karl Wright. You will surely get your answer.

> Threadsafe CloseableHttpClient uses non-threadsafe NTLMScheme, causing errors
> -----------------------------------------------------------------------------
>
>                 Key: HTTPCLIENT-1686
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1686
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpClient
>    Affects Versions: 4.5.1
>         Environment: Java/OSX
>            Reporter: Jim Cassidy
>
> The class org.apache.http.impl.client.CloseableHttpClient is marked as thread safe, but
it may use org.apache.http.impl.auth.NTLMScheme during authentication (in this case, to Exchange's
Exchange Web Services).  NLTMScheme is not thread safe, and concurrent access can result in
a crash when multiple threads access and modify the static NTLMEngineImpl Type1Message static
private member, see stack trace below.
> I've verified a fix for this particular issue by removing the static Type1Message object
and allocating a new one for each call to NTLMEngineImpl.getType1Message, but that's not necessarily
sufficient to mark NTLMScheme as ThreadSafe.
> Stack trace:
> {noformat}
> Java.lang.ArrayIndexOutOfBoundsException: 40
> 0 = {StackTraceElement@8714} "org.apache.http.impl.auth.NTLMEngineImpl$NTLMMessage.addByte(NTLMEngineImpl.java:911)"
> 1 = {StackTraceElement@8715} "org.apache.http.impl.auth.NTLMEngineImpl$NTLMMessage.addULong(NTLMEngineImpl.java:941)"
> 2 = {StackTraceElement@8716} "org.apache.http.impl.auth.NTLMEngineImpl$Type1Message.getResponse(NTLMEngineImpl.java:1048)"
> 3 = {StackTraceElement@8717} "org.apache.http.impl.auth.NTLMEngineImpl.getType1Message(NTLMEngineImpl.java:148)"
> 4 = {StackTraceElement@8718} "org.apache.http.impl.auth.NTLMEngineImpl.generateType1Msg(NTLMEngineImpl.java:1628)"
> 5 = {StackTraceElement@8719} "org.apache.http.impl.auth.NTLMScheme.authenticate(NTLMScheme.java:139)"
> 6 = {StackTraceElement@8720} "org.apache.http.impl.auth.AuthSchemeBase.authenticate(AuthSchemeBase.java:138)"
> 7 = {StackTraceElement@8721} "org.apache.http.impl.auth.HttpAuthenticator.doAuth(HttpAuthenticator.java:239)"
> 8 = {StackTraceElement@8722} "org.apache.http.impl.auth.HttpAuthenticator.generateAuthResponse(HttpAuthenticator.java:202)"
> 9 = {StackTraceElement@8723} "org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:262)"
> 10 = {StackTraceElement@8724} "org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)"
> 11 = {StackTraceElement@8725} "org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88)"
> 12 = {StackTraceElement@8726} "org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)"
> 13 = {StackTraceElement@8727} "org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)"
> 14 = {StackTraceElement@8728} "org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)"
> 15 = {StackTraceElement@8729} 
> {noformat}



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