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Posted to dev@hc.apache.org by "Alessandro Gherardi (JIRA)" <ji...@apache.org> on 2017/11/03 02:54:00 UTC
[jira] [Commented] (HTTPCLIENT-1855) Digest auth: Nonce counter not
incremented after reuse
[ https://issues.apache.org/jira/browse/HTTPCLIENT-1855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16237015#comment-16237015 ]
Alessandro Gherardi commented on HTTPCLIENT-1855:
-------------------------------------------------
Hi [~olegk] - any feedback? Thank you.
> Digest auth: Nonce counter not incremented after reuse
> ------------------------------------------------------
>
> Key: HTTPCLIENT-1855
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1855
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient (classic)
> Affects Versions: 4.5.2
> Reporter: Alessandro Gherardi
> Priority: Major
> Attachments: HttpClient5Digest.java, HttpClientDigest.java, httpclient5.log, wireshark.txt
>
>
> I have a client app using httpclient 4.5.2 with BasicCredentialsProvider and BasicAuthCache. and web server that requires HTTP digest authentication.
> The client sends 3 requests to the web server.
> When the app sends the first request, the server returns an HTTP 401 with a digest challenge. httpclient automatically retries the request with the Authorization header. The header contains the nonce returned by the server and a nonce counter (nc) of 1. The retry succeeds and httpclient caches the DigestScheme.
> For the second request, httpclient uses the cached DigestScheme to calculate the Authorization header pre-emptively. The header contains the same nonce and specifies a nonce counter of 2. The request succeed without requiring a retry.
> For the third request, httpclient uses the cached DigestScheme to calculate the Authorization header pre-emptively. Even though the header contains the same nonce, the nonce counter is set to 2 again. This causes the server to return a 401. httpclient should have incremented the nonce counter to 3.
> I believe that the root cause of this problem is that, although DigestScheme increases the nonceCount field every time the authenticate() method is called, HttpAuthenticator does not re-cache DigestScheme after reusing it. The re-cache is needed because BasicAuthCache stores DigestScheme in serialized format.
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