Error with asn1Spec

[Joerg Sorge]

Hi, 

I'm using this example https://github.com/fritzy/SleekXMPP/blob/master/examples/send_client.py for starting xmpp via python and get this Error. 

INFO     Negotiating TLS

INFO     Using SSL version: TLSv1

ERROR    Connection error.

ERROR    <TagSet object at 0xb6082610 tags 0:32:16> not in asn1Spec: <OctetString schema object at 0xb609a410 tagSet <TagSet object at 0xb62ee110 tags 0:0:4> encoding iso-8859-1>

Traceback (most recent call last):

  File "/usr/local/lib/python2.7/dist-packages/sleekxmpp/xmlstream/xmlstream.py", line 1492, in _process

    if not self.__read_xml():

  File "/usr/local/lib/python2.7/dist-packages/sleekxmpp/xmlstream/xmlstream.py", line 1564, in __read_xml

    self.__spawn_event(xml)

  File "/usr/local/lib/python2.7/dist-packages/sleekxmpp/xmlstream/xmlstream.py", line 1632, in __spawn_event

    handler.prerun(stanza_copy)

  File "/usr/local/lib/python2.7/dist-packages/sleekxmpp/xmlstream/handler/callback.py", line 64, in prerun

    self.run(payload, True)

  File "/usr/local/lib/python2.7/dist-packages/sleekxmpp/xmlstream/handler/callback.py", line 76, in run

    self._pointer(payload)

  File "/usr/local/lib/python2.7/dist-packages/sleekxmpp/features/feature_starttls/starttls.py", line 64, in _handle_starttls_proceed

    if self.xmpp.start_tls():

  File "/usr/local/lib/python2.7/dist-packages/sleekxmpp/xmlstream/xmlstream.py", line 889, in start_tls

    cert.verify(self._expected_server_name, self._der_cert)

  File "/usr/local/lib/python2.7/dist-packages/sleekxmpp/xmlstream/cert.py", line 134, in verify

    cert_names = extract_names(raw_cert)

  File "/usr/local/lib/python2.7/dist-packages/sleekxmpp/xmlstream/cert.py", line 73, in extract_names

    asn1Spec=OctetString())[0]

  File "/usr/local/lib/python2.7/dist-packages/pyasn1/codec/ber/decoder.py", line 1318, in __call__

    '%s not in asn1Spec: %r' % (tagSet, asn1Spec)

PyAsn1Error: <TagSet object at 0xb6082610 tags 0:32:16> not in asn1Spec: <OctetString schema object at 0xb609a410 tagSet <TagSet object at 0xb62ee110 tags 0:0:4> encoding iso-8859-1>

What can I do?

I'ts running on Rasperry 2B with Debian Stretch.

Thanks for every hints.

[Dmytro Sirenko]

Hi Joerg,

I was getting the same error (my XMPP server: ejabberd on Debian 9), and I fixed it by changing lines 72-73 in sleekxmpp.xmlstream.cert from this:

value = decoder.decode(extension.getComponentByName('extnValue'),
                       asn1Spec=OctetString())[0]

to this:

value = extension.getComponentByName('extnValue')

After that I had to fix a certificate "expiration" issue in sleekxmpp.xmlstream.cert:111 and sleekxmpp.xmlstream.cert:115: UTC time is encoded as 'YYMMDDhhmm[ss]Z' in certificates, but the existing code uses '%Y', which interprets first four digits as the year part, so it should be changed to '%y' to interpret the 'YY' part correctly.

I'd like to make a pull request for these changes, but I've tested my changes with my server only so far, so I am not sure I am not breaking other setups and certificates.  

Regards,
Dmytro.

[Rakhi Kasat]

Thank you so much for this answer! saved my day :)