Thank you Jiajia for your taking time to fix this long hanging issue. The fix looks great!
Regards, Kai -----Original Message----- From: Li, Jiajia [mailto:[email protected]] Sent: Wednesday, June 14, 2017 10:42 AM To: [email protected] Subject: RE: [Kerby] TGS req failing with "Unexpected item context" Hi all, I have some fix for this issue, could anyone help me to check it using your test env? Commit log is: commit a6224d2cf60e8e18ba5e307f1a4a2bc4c01a55b4 Author: plusplusjiajia <[email protected]> Date: Wed Jun 14 10:43:46 2017 +0800 Fix DIRKRB-614 and DIRKRB-631. Thanks Jiajia -----Original Message----- From: Marc de Lignie [mailto:[email protected]] Sent: Thursday, June 8, 2017 8:10 PM To: [email protected] Subject: Re: [Kerby] TGS req failing with "Unexpected item context" Hi Kai, See, my original logs from both the python client and the KDC at (this link is also present in DIRKRB-631): http://mail-archives.apache.org/mod_mbox/directory-kerby/201705.mbox/browser Here, the logs of the python client coincide with Pratyush's report in the current thread. The logs of the KDC coincide with the old DIRKKRB-614 issue. I would say all reports are related to the same error, Kerby not being able the decode the FAST OTP requests of MIT Kerberos 1.11+. Also, all are related to a TGS request based on an existing TGT. Cheers, Marc Op 06-06-17 om 21:07 schreef Marc de Lignie: > Dear all, > > My bad, it seems I made a separate issue for this, which might add > more details to DIRKRB-614 and might help you in finding the decode > error: > > https://issues.apache.org/jira/browse/DIRKRB-631 > > The workaround I mentioned is there, in the comments. > > Cheers, Marc > > > Op 06-06-17 om 21:02 schreef Marc de Lignie: >> Pratjush, >> >> I just posted a temporary workaround as a comment below: >> >> https://issues.apache.org/jira/browse/DIRKRB-614 >> >> Cheers, Marc >> >> >> Kai wrote: >> >> It seems so and we need to fix it. However, I don't see any obvious >> cause for it. Hope we can get to this sooner (should be next week) >> after some deadline is caught. Sorry for the late. >> >> Regards, >> Kai >> >> -----Original Message----- >> From: Colm O hEigeartaigh [mailto:[email protected]] >> Sent: Monday, June 05, 2017 12:04 AM >> To: [email protected] >> Subject: Re: [Kerby] TGS req failing with "Unexpected item context" >> >> Looks like you're running into this known issue: >> >> https://issues.apache.org/jira/browse/DIRKRB-614 >> >> Colm. >> >> On Sat, Jun 3, 2017 at 8:09 PM, pratyush parimal >> <[email protected] >>> wrote: >> >>> Hi everyone, >>> >>> I'm writing a simple Java program that stands up a KDC using the >>> SimpleKdcServer class, and I'm trying to use it for AS & TGS >>> operations. Relevant code is below: >>> >>> kdc = new SimpleKdcServer(); >>> kdc.setKdcHost("kdc.example.com"); >>> kdc.setKdcPort(60088); >>> kdc.setKdcRealm("EXAMPLE.COM"); >>> >>> kdc.setAllowUdp(false); >>> kdc.setWorkDir(keytabFile.getParentFile()); >>> >>> kdc.init(); >>> >>> kdc.createPrincipal("[email protected]", "u1pwd"); >>> kdc.createPrincipal("myservice/[email protected]", >>> "myservicepwd"); >>> >>> kdc.start(); >>> >>> I use kinit to fetch the TGT for my principal "u1" and that's >>> successful. >>> However, the subsequent TGS req from my client program fails with >>> the >>> error: >>> >>> GSSAPI continuation error: Unknown code krcM 137 >>> >>> . I debugged through the source code for Kerby and saw that the full >>> exception was not getting thrown because of a (e instanceof >>> KdcRecoverableException) check. When I print the stacktrace via a >>> debugger, I see the following (apologies for the huge stack trace): >>> >>> [pool-1-thread-1] INFO >>> org.apache.kerby.kerberos.kerb.server.request.KdcRequest - Found >>> fast padata and starting to process it. >>> org.apache.kerby.kerberos.kerb.KrbException: Decoding failed at >>> org.apache.kerby.kerberos.kerb.KrbCodec.decode(KrbCodec.java:85) >>> at org.apache.kerby.kerberos.kerb.KrbCodec.decode(KrbCodec.java:70) >>> at >>> org.apache.kerby.kerberos.kerb.server.request.KdcRequest.kdcFindFast >>> ( >>> KdcRequest.java:213) >>> at >>> org.apache.kerby.kerberos.kerb.server.request. >>> KdcRequest.process(KdcRequest.java:170) >>> at >>> org.apache.kerby.kerberos.kerb.server.KdcHandler. >>> handleMessage(KdcHandler.java:116) >>> at >>> org.apache.kerby.kerberos.kerb.server.impl.DefaultKdcHandler. >>> handleMessage(DefaultKdcHandler.java:67) >>> at >>> org.apache.kerby.kerberos.kerb.server.impl.DefaultKdcHandler.run( >>> DefaultKdcHandler.java:52) >>> at >>> java.util.concurrent.ThreadPoolExecutor.runWorker( >>> ThreadPoolExecutor.java:1145) >>> at >>> java.util.concurrent.ThreadPoolExecutor$Worker.run( >>> ThreadPoolExecutor.java:615) >>> at java.lang.Thread.run(Thread.java:745) >>> Caused by: java.io.IOException: Unexpected item context [0] >>> [tag=0xA0, off=0, len=3+198], expecting 0x30 at >>> org.apache.kerby.asn1.type.Asn1Encodeable.decode( >>> Asn1Encodeable.java:219) >>> at org.apache.kerby.asn1.type.Asn1Encodeable.decode( >>> Asn1Encodeable.java:207) >>> at org.apache.kerby.kerberos.kerb.KrbCodec.decode(KrbCodec.java:83) >>> ... 9 more >>> org.apache.kerby.kerberos.kerb.KrbException: Decoding failed at >>> org.apache.kerby.kerberos.kerb.KrbCodec.decode(KrbCodec.java:85) >>> at org.apache.kerby.kerberos.kerb.KrbCodec.decode(KrbCodec.java:70) >>> at >>> org.apache.kerby.kerberos.kerb.server.request.KdcRequest.kdcFindFast >>> ( >>> KdcRequest.java:213) >>> at >>> org.apache.kerby.kerberos.kerb.server.request. >>> KdcRequest.process(KdcRequest.java:170) >>> at >>> org.apache.kerby.kerberos.kerb.server.KdcHandler. >>> handleMessage(KdcHandler.java:116) >>> at >>> org.apache.kerby.kerberos.kerb.server.impl.DefaultKdcHandler. >>> handleMessage(DefaultKdcHandler.java:67) >>> at >>> org.apache.kerby.kerberos.kerb.server.impl.DefaultKdcHandler.run( >>> DefaultKdcHandler.java:52) >>> at >>> java.util.concurrent.ThreadPoolExecutor.runWorker( >>> ThreadPoolExecutor.java:1145) >>> at >>> java.util.concurrent.ThreadPoolExecutor$Worker.run( >>> ThreadPoolExecutor.java:615) >>> at java.lang.Thread.run(Thread.java:745) >>> Caused by: java.io.IOException: Unexpected item context [0] >>> [tag=0xA0, off=0, len=3+198], expecting 0x30 at >>> org.apache.kerby.asn1.type.Asn1Encodeable.decode( >>> Asn1Encodeable.java:219) >>> at org.apache.kerby.asn1.type.Asn1Encodeable.decode( >>> Asn1Encodeable.java:207) >>> at org.apache.kerby.kerberos.kerb.KrbCodec.decode(KrbCodec.java:83) >>> ... 9 more >>> >>> The client program (and also kinit) were using the krb5.conf that >>> was auto-generated by the SimpleKdcServer in the workdir, and looked >>> like the following (I just replaced localhost with the FQDN of my >>> machine): >>> >>> [libdefaults] >>> kdc_realm = EXAMPLE.COM >>> default_realm = EXAMPLE.COM >>> udp_preference_limit = 1 >>> kdc_tcp_port = 60088 >>> #_KDC_UDP_PORT_ >>> >>> [realms] >>> EXAMPLE.COM = { >>> kdc = kdc.example.com:60088 >>> } >>> >>> I had also enabled KRB5_TRACE on my client program that was making >>> the TGS req, and it shows the following: >>> >>> >>> [1588796] 1496515969.488037: ccselect can't find appropriate cache >>> for server principal myservice/kdc.example.com@ [1588796] >>> 1496515969.488112: Getting credentials [email protected] -> >>> myservice/kdc.example.com@ using ccache FILE:/tmp/krb5cc_20474 >>> [1588796] 1496515969.488170: Retrieving [email protected] -> >>> myservice/kdc.example.com@ from FILE:/tmp/krb5cc_20474 with result: >>> -1765328243/Matching credential not found (filename: >>> /tmp/krb5cc_20474) [1588796] 1496515969.488206: Retrying >>> [email protected] -> myservice/ [email protected] with >>> result: -1765328243/Matching credential not found (filename: >>> /tmp/krb5cc_20474) [1588796] 1496515969.488214: Server has referral >>> realm; starting with myservice/[email protected] >>> [1588796] 1496515969.488250: Retrieving [email protected] -> krbtgt/ >>> [email protected] from FILE:/tmp/krb5cc_20474 with result: >>> 0/Success [1588796] 1496515969.488259: Starting with TGT for client >>> realm: >>> [email protected] -> krbtgt/[email protected] [1588796] >>> 1496515969.488266: Requesting tickets for myservice/ >>> [email protected], referrals on [1588796] >>> 1496515969.488298: Generated subkey for TGS request: >>> aes128-cts/476E >>> [1588796] 1496515969.488345: etypes requested in TGS request: >>> aes256-cts, aes128-cts, des3-cbc-sha1, rc4-hmac, camellia128-cts, >>> camellia256-cts [1588796] 1496515969.488460: Encoding request body >>> and padata into FAST request [1588796] 1496515969.488522: Sending >>> request (835 bytes) to EXAMPLE.COM [1588796] 1496515969.488553: >>> Resolving hostname kdc.example.com [1588796] 1496515969.488621: >>> Initiating TCP connection to stream >>> 172.17.0.53:60088 >>> [1588796] 1496515969.488682: Sending TCP request to stream >>> 172.17.0.53:60088 >>> [1588796] 1496515969.492213: Received answer (134 bytes) from stream >>> 172.17.0.53:60088 >>> [1588796] 1496515969.492222: Terminating TCP connection to stream >>> 172.17.0.53:60088 >>> [1588796] 1496515969.492292: Response was not from master KDC >>> [1588796] 1496515969.492309: TGS request result: -1765323383/Unknown >>> code krcM 137 [1588796] 1496515969.492332: Requesting tickets for >>> myservice/ [email protected], referrals off [1588796] >>> 1496515969.492351: Generated subkey for TGS request: >>> aes128-cts/AECC >>> [1588796] 1496515969.492377: etypes requested in TGS request: >>> aes256-cts, aes128-cts, des3-cbc-sha1, rc4-hmac, camellia128-cts, >>> camellia256-cts [1588796] 1496515969.492430: Encoding request body >>> and padata into FAST request [1588796] 1496515969.492483: Sending >>> request (835 bytes) to EXAMPLE.COM [1588796] 1496515969.492493: >>> Resolving hostname kdc.example.com [1588796] 1496515969.492543: >>> Initiating TCP connection to stream >>> 172.17.0.53:60088 >>> [1588796] 1496515969.492586: Sending TCP request to stream >>> 172.17.0.53:60088 >>> [1588796] 1496515969.496886: Received answer (134 bytes) from stream >>> 172.17.0.53:60088 >>> [1588796] 1496515969.496894: Terminating TCP connection to stream >>> 172.17.0.53:60088 >>> [1588796] 1496515969.496948: Response was not from master KDC >>> [1588796] 1496515969.496963: TGS request result: -1765323383/Unknown >>> code krcM 137 >>> >>> >>> I've tried the same scenario with the MIT krb5kdc service with the >>> same principals, and the TGS req is successful, with the trace log: >>> >>> [1590761] 1496516355.23070: ccselect module realm chose cache >>> FILE:/tmp/krb5cc_20474 with client principal [email protected] for >>> server principal myservice/[email protected] >>> [1590761] 1496516355.23150: Getting credentials [email protected] -> >>> myservice/ [email protected] using ccache >>> FILE:/tmp/krb5cc_20474 [1590761] 1496516355.23212: Retrieving >>> [email protected] -> myservice/ [email protected] from >>> FILE:/tmp/krb5cc_20474 with result: >>> -1765328243/Matching credential not found (filename: >>> /tmp/krb5cc_20474) [1590761] 1496516355.23260: Retrieving >>> [email protected] -> krbtgt/ [email protected] from >>> FILE:/tmp/krb5cc_20474 with result: 0/Success [1590761] >>> 1496516355.23269: Starting with >> TGT for client realm: >>> [email protected] -> krbtgt/[email protected] [1590761] >>> 1496516355.23277: Requesting tickets for myservice/ >>> [email protected], referrals on [1590761] >>> 1496516355.23312: Generated subkey for TGS request: >>> aes256-cts/3F0A >>> [1590761] 1496516355.23368: etypes requested in TGS request: >>> aes256-cts, aes128-cts, des3-cbc-sha1, rc4-hmac, camellia128-cts, >>> camellia256-cts [1590761] 1496516355.23485: Encoding request body >>> and padata into FAST request [1590761] 1496516355.23552: Sending >>> request (933 bytes) to EXAMPLE.COM [1590761] 1496516355.23581: >>> Resolving hostname kdc.example.com [1590761] 1496516355.23651: >>> Sending initial UDP request to dgram >>> 172.17.0.53:88 >>> [1590761] 1496516355.24205: Received answer (912 bytes) from dgram >>> 172.17.0.53:88 >>> [1590761] 1496516355.24223: Response was not from master KDC >>> [1590761] 1496516355.24240: Decoding FAST response [1590761] >>> 1496516355.24334: FAST reply key: aes256-cts/8818 [1590761] >>> 1496516355.24376: TGS reply is for [email protected] -> myservice/ >>> [email protected] with session key aes256-cts/126E >>> [1590761] 1496516355.24390: TGS request result: 0/Success [1590761] >>> 1496516355.24395: Received creds for desired service myservice/ >>> [email protected] [1590761] 1496516355.24401: Storing >>> [email protected] -> myservice/ [email protected] in >>> FILE:/tmp/krb5cc_20474 [1590761] 1496516355.24517: Retrieving >>> [email protected] -> krbtgt/ [email protected] from >>> FILE:/tmp/krb5cc_20474 with result: 0/Success [1590761] >>> 1496516355.24528: Get cred via TGT krbtgt/ [email protected] >>> after requesting krbtgt/[email protected] (canonicalize off) >>> [1590761] 1496516355.24546: Generated subkey for TGS request: >>> aes256-cts/0D91 >>> [1590761] 1496516355.24574: etypes requested in TGS request: >>> aes256-cts [1590761] 1496516355.24633: Encoding request body and >>> padata into FAST request [1590761] 1496516355.24689: Sending request >>> (931 bytes) to EXAMPLE.COM [1590761] 1496516355.24699: Resolving >>> hostname kdc.example.com [1590761] 1496516355.24750: Sending initial >>> UDP request to dgram >>> 172.17.0.53:88 >>> [1590761] 1496516355.25098: Received answer (900 bytes) from dgram >>> 172.17.0.53:88 >>> [1590761] 1496516355.25115: Response was not from master KDC >>> [1590761] 1496516355.25127: Decoding FAST response [1590761] >>> 1496516355.25198: FAST reply key: aes256-cts/03AB [1590761] >>> 1496516355.25234: TGS reply is for [email protected] -> krbtgt/ >>> [email protected] with session key aes256-cts/A423 [1590761] >>> 1496516355.25246: Got cred; 0/Success [1590761] 1496516355.25315: >>> Creating authenticator for [email protected] -> >>> myservice/[email protected], seqnum 751690771, subkey >>> aes256-cts/91D0, session key aes256-cts/126E >>> >>> >>> >>> My best guess is that maybe I'm missing some configuration steps in >>> my Java code and that's causing the FAST request to fail. I couldn't >>> find any code examples for kerby anywhere which can help me with my >>> use case. Does anyone have any ideas about the above? >>> >>> Apologies again for the long email, just wanted to share my trials >>> so far. >>> Have a nice weekend. >>> >>> Cheers, >>> Pratyush >>> >> >> >> >> -- >> Colm O hEigeartaigh >> >> Talend Community Coder >> http://coders.talend.com >> > -- Marc de Lignie
