Protocol plugin for Office 365/Lync/OCS / Bugs / #259 HTML response to EWS autodiscover triggers libxml2 assert

Stefan Becker - 2014-07-10

You obviously ignored the pointer to read the FAQ. I'll re-open this bug when the required information is added to this report.

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Stefan Becker - 2014-07-10

status: open --> closed-invalid
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Fabrice Bacchella - 2014-07-10

Here it is.

2014-07-10 1.log

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Stefan Becker - 2014-07-10

summary: Adium 1.5.10 continuously crash with version 1.18.2 --> HTML response to EWS autodiscover trigger libxml2 assert

status: closed-invalid --> accepted

assigned_to: Stefan Becker
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Stefan Becker - 2014-07-10

Thanks for the debug log.

In your setup the last EWS HTTP request triggers a HTML response, which obviously triggers an assert in libxml2 when we are asking it to parse the reponse body as XML.

As a workaround you can disable "publish my calendar information" in the SIPE account settings. That will disable EWS autodiscover process to be triggered.

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Stefan Becker - 2014-07-10

This should be fixed by git commit 1bb58b5.

@reporter: I need to you to compile SIPEAdiumPlugin from git HEAD, because I can't reproduce your error condition in my setup. Thank you.

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Stefan Becker - 2014-07-10

summary: HTML response to EWS autodiscover trigger libxml2 assert --> HTML response to EWS autodiscover triggers libxml2 assert
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Fabrice Bacchella - 2014-07-10

The workarounds works.

But not the patch.

The stack :
19:34:38: -[ESDebugController exceptionHandler:shouldLogException:mask:]:76: Exception raised: Uncaught system exception: signal 11
19:34:38: 0 Adium 0x00000001004d7e40 AILogBacktrace_impl + 54
1 Adium 0x000000010005f3cd Adium + 390093
2 ExceptionHandling 0x0000000100a909e2 -[NSExceptionHandler _handleException:mask:] + 168
3 ExceptionHandling 0x0000000100a907ba NSExceptionHandlerUncaughtSignalHandler + 35
4 libsystem_c.dylib 0x00007fff8b36f90a _sigtramp + 26
5 ??? 0x0000000000000105 0x0 + 261
6 libxml2.2.dylib 0x00007fff8a7269d2 __xmlRaiseError + 1453
7 libxml2.2.dylib 0x00007fff8a73c8a0 xmlFatalErrMsg + 162
8 libxml2.2.dylib 0x00007fff8a740253 xmlParsePITarget + 117
9 libxml2.2.dylib 0x00007fff8a7404c7 xmlParsePI + 210
10 libxml2.2.dylib 0x00007fff8a74922d xmlParseMisc + 93
11 libxml2.2.dylib 0x00007fff8a749543 xmlParseDocument + 753
12 libxml2.2.dylib 0x00007fff8a74d5ec xmlSAXUserParseMemory + 106

In the log :
POST /Autodiscover/Autodiscover.xml HTTP/1.1
Host: 3ds.com
User-Agent: Sipe/1.18.2
Accept: text/xml
Content-Length: 326
Content-Type: text/xml

But the server don't care :
HTTP/1.1 303 See Other
...
Location: https://3ds.com/404-not-found/
Content-Type: text/html

And after the repost :
POST /404-not-found/ HTTP/1.1
Host: 3ds.com
...
Accept: text/xml

And the response:
HTTP/1.1 200 OK
...
Content-Type: text/html

I know it's badly broken server. But I can't fix it :-(.

There is something else fishy.

In the log, i see :
POST /Autodiscover/Autodiscover.xml HTTP/1.1
Host: autodiscover.3ds.com
User-Agent: Sipe/1.18.2
Accept: text/xml
Content-Length: 326
Content-Type: text/xml

<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/requestschema/2006"> <Request> <EMailAddress>fabrice.bacchella@3ds.com</EMailAddress> <AcceptableResponseSchema>http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a</AcceptabeResponseSchema> </Request></Autodiscover>

and :
POST /Autodiscover/Autodiscover.xml HTTP/1.1
Host: 3ds.com
User-Agent: Sipe/1.18.2
Accept: text/xml
Content-Length: 326
Content-Type: text/xml

<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/requestschema/2006"> <Request> <EMailAddress>fabrice.bacchella@3ds.com</EMailAddress> <AcceptableResponseSchema>http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a</AcceptabeResponseSchema> </Request></Autodiscover>

Why some discovery is done on autodiscover.3ds.com (this one almost works) and on 3ds.com (this one is broken) ?

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- Stefan Becker - 2014-07-10
  
  Why some discovery is done on autodiscover.3ds.com (this one almost works) and on 3ds.com (this one is broken) ?
  
  Because https://%s/Autodiscover/Autodiscover.xml is a fallback that is tried last, which some users needed in the past. See src/core/sipe-ews-autodiscover.c.
  
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BTW: it seems the Mac OS X libxml2 seems to be too old or broken. When I create a fake EWS that responds with the HTML contents from your log, I see the following from the log (Fedora 20):

(20:52:36) sipe: XML parser error: Domain 1, code 64, level 3: XML declaration allowed only at the start of the document
(20:52:36) sipe: XML parser error: Domain 1, code 80, level 3: Double hyphen within comment
(20:52:36) sipe: XML parser error: Domain 1, code 68, level 3: xmlParseStartTag: invalid element name
(20:52:36) sipe: XML parser error: Domain 1, code 76, level 3: Opening and ending tag mismatch: link line 75 and head
(20:52:36) sipe: XML parser error: Domain 1, code 76, level 3: Opening and ending tag mismatch: img line 177 and a
(20:52:36) sipe: XML parser error: Domain 1, code 76, level 3: Opening and ending tag mismatch: a line 177 and div
(20:52:36) sipe: XML parser error: Domain 1, code 76, level 3: Opening and ending tag mismatch: img line 180 and a
(20:52:36) sipe: XML parser error: Domain 1, code 76, level 3: Opening and ending tag mismatch: a line 180 and div
(20:52:36) sipe: XML parser error: Domain 1, code 68, level 3: xmlParseEntityRef: no name
(20:52:36) sipe: XML parser error: Domain 1, code 68, level 3: xmlParseEntityRef: no name
...
(20:52:36) sipe: XML parser error: Domain 1, code 77, level 3: Premature end of data in tag meta line 74
(20:52:36) sipe: XML parser error: Domain 1, code 77, level 3: Premature end of data in tag head line 6
(20:52:36) sipe: XML parser error: Domain 1, code 77, level 3: Premature end of data in tag html line 5
(20:52:36) sipe: ucs_ews_autodiscover_cb: can't detect EWS URL, contact list operations will not work!

So libxml2 complains and returns a parse error instead of barfing.

Fabrice Bacchella - 2014-07-10

That's possible, I'm on 10.8.5, not 10.9.

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Stefan Becker - 2014-07-10

Added an additional check on Content-Type in git commit 6061788

@reporter: please verify, thank you

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Fabrice Bacchella - 2014-07-11

yes it works.

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Stefan Becker - 2014-07-11

status: accepted --> closed-fixed
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Stefan Becker - 2014-07-11

Thanks. CLOSING

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HTML response to EWS autodiscover triggers libxml2 assert

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#259 HTML response to EWS autodiscover triggers libxml2 assert

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