So far my attempt to ask it to the community :-) But I think I finally managed to find the explanation. So in case someone else ever has the same problem, searches why and stumbles onto this page...
The kadmin-protocol that differs between the heimdal-implementation used in Mac OS and the MIT-implementation on linux seems to be the culprit. http://kerberos.996246.n3.nabble.com/Lion-problems-tc13877.html | | Mar 12, 2012; 9:52pm Arthur Prokosch-2 Arthur Prokosch-2 | ... | We've wandered into Heimdal territory here and should probably switch | to [hidden email] or discussions.apple.com. In the meantime: | if anyone else has seen Mac OS 10.7 Heimdal tickets lose their | Forwardable and Proxiable flags in the process of initiating GSSAPI | ssh connections or has an explanation, I'd be quite interested to hear | off-list. | | best, | -arthur prokosch | system administrator | [1]MIT Computer Science and Artificial Intelligence Lab. | ... In the meantime I also tested it on MacOS Sierra. Problem is still there. I don't know if there is any solution though. P.S. Anybody who confirms my hypothesis? vm@c4k3.space schreef op 2016-10-26 14:21: > Hi, > > I hope I'm at the right place here for my issue. > > This is the case: > > > On my macbook (Mac OS X 10.11), I have a renewable Kerberos-ticket: > > --- > macbook013:~ vm$ klist -v > Credentials cache: API:EF9959E6-85DF-446F-9B21-3CEEC606FA2D > Principal: v...@realm.com > Cache version: 0 > > Server: krbtgt/realm....@realm.com > Client: v...@realm.com > Ticket etype: aes256-cts-hmac-sha1-96, kvno 1 > Ticket length: 342 > Auth time: Oct 26 13:55:09 2016 > End time: Nov 25 12:55:05 2016 > Renew till: Jan 26 12:55:05 2017 > Ticket flags: enc-pa-rep, pre-authent, initial, renewable, proxiable, > forwardable > Addresses: addressless > --- > > If I do a ssh (GSSAPIAuthentication yes,GSSAPIDelegateCredentials yes) > to a linux-server, the ticket there is not renewable anymore: > > --- > macbook013:~ vm$ ssh linuxserver2 > linuxserver2 ~ # klist -f > Ticket cache: FILE:/tmp/krb5cc_1379_BZVstF6000 > Default principal: v...@realm.com > > Valid starting Expires Service principal > 10/26/16 14:00:30 11/25/16 12:55:05 krbtgt/realm....@realm.com > Flags: FfPAT > linuxserver2 ~ # krenew > krenew: error renewing credentials: KDC can't fulfill requested > option > linuxserver2 ~ # kinit -R > kinit: KDC can't fulfill requested option while renewing credentials > --- > > If I do a kinit on linuxserver1 and get a renewable ticket there and > ssh > to linuxserver2, the forwarded ticket stays renewable. > > I guess it has something to do with the ssh-client on Mac OS X? (but > copying the ssh_config from linuxserver1 to the macbook does not solve > it. Copying the krb5.conf doesn't solve it either) > Or should I search the cause in another direction? > Maybe I'm missing something obvious. > > > Thank you for thinking with me! > > VM > ________________________________________________ > Kerberos mailing list Kerberos@mit.edu > https://mailman.mit.edu/mailman/listinfo/kerberos ________________________________________________ Kerberos mailing list Kerberos@mit.edu https://mailman.mit.edu/mailman/listinfo/kerberos
