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From "bitfire (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HTTPCLIENT-1489) Multiple, comma-separated challenges in WWW-Authenticate are not recognized
Date Fri, 21 Mar 2014 19:45:46 GMT
bitfire created HTTPCLIENT-1489:
-----------------------------------

             Summary: Multiple, comma-separated challenges in WWW-Authenticate are not recognized
                 Key: HTTPCLIENT-1489
                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1489
             Project: HttpComponents HttpClient
          Issue Type: Bug
          Components: HttpClient
    Affects Versions: 4.3.3
            Reporter: bitfire


As per RFC 2616, WWW-Authenticate may contain more than one challenge:
»User agents are advised to take special care in parsing the WWW- Authenticate field value
as it might contain more than one challenge, or if more than one WWW-Authenticate header field
is provided, the contents of a challenge itself can contain a comma-separated list of authentication
parameters.« [https://tools.ietf.org/html/rfc2616#section-14.47]

For instance, https://contacts.icloud.com returns such a WWW-Authenticate header:

> GET / HTTP/1.1
> Host: contacts.icloud.com
> Accept: */*
> 
< HTTP/1.1 401 Unauthorized
< ...
< WWW-Authenticate: X-MobileMe-AuthToken realm="Newcastle", Basic realm="Newcastle"

The X-MobileMe-AuthToken challenge is recognized by HttpClient, but the Basic challenge is
not. HttpClient logs when sending a GET request to https://contacts.icloud.com:

[DEBUG] headers - http-outgoing-0 << HTTP/1.1 401 Unauthorized
[DEBUG] headers - http-outgoing-0 << Date: Fri, 21 Mar 2014 19:20:14 GMT
[DEBUG] headers - http-outgoing-0 << X-Apple-Request-UUID: d1d0aa7d-d651-4da2-be9f-595f1619db85
[DEBUG] headers - http-outgoing-0 << X-Responding-Instance: carddav:12100701:st13p21ic-quav11230703:8001:14B52:125783
[DEBUG] headers - http-outgoing-0 << WWW-Authenticate: X-MobileMe-AuthToken realm="Newcastle",
Basic realm="Newcastle"
[DEBUG] headers - http-outgoing-0 << Content-Length: 0
[DEBUG] MainClientExec - Connection can be kept alive indefinitely
[DEBUG] HttpAuthenticator - Authentication required
[DEBUG] HttpAuthenticator - contacts.icloud.com:443 requested authentication
[INFO] TargetAuthenticationStrategy - GOT Auth header: X-MobileMe-AuthToken realm="Newcastle",
Basic realm="Newcastle"
[DEBUG] TargetAuthenticationStrategy - Authentication schemes in the order of preference:
[negotiate, Kerberos, NTLM, Digest, Basic]
[DEBUG] TargetAuthenticationStrategy - Challenge for negotiate authentication scheme not available
[DEBUG] TargetAuthenticationStrategy - Challenge for Kerberos authentication scheme not available
[DEBUG] TargetAuthenticationStrategy - Challenge for NTLM authentication scheme not available
[DEBUG] TargetAuthenticationStrategy - Challenge for Digest authentication scheme not available
[DEBUG] TargetAuthenticationStrategy - Challenge for Basic authentication scheme not available

The Basic auth scheme is NOT recognized!

Reason: org.apache.http.impl.client.AuthenticationStrategyImpl:getChallenges iterates through
the WWW-Authenticate HEADERS but doesn't take account that a single header may contain multiple
challenges.

How to fix:
Split and prase the WWW-Authenticate header correctly in org.apache.http.impl.client.AuthenticationStrategyImpl:getChallenges




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