Hello again! Based on my previous question (“Cross-Realm Admins” from last month) we’re now using a model with separate admin principals per realm, and a large keyring of keytab files. This seems to be working *mostly* fine.
Where we run into issues is with creating the cross-realm trusts, specifically one-way trusts with a sub-realm trusting our master realm. When our automation tries to create the trust, it often fails with the following log messages: KerberosService - Running [kadmin, -r, A.VIASAT.IO, -p, api/[email protected], -kt, /path/to/keytab-A.VIASAT.IO, -q, add_principal -pw **random stuff** krbtgt/[email protected]] WARNING: no policy specified for krbtgt/[email protected]; defaulting to no policy Authenticating as principal api/[email protected] with keytab /path/to/keytab-A.VIASAT.IO. Principal "krbtgt/[email protected]" created. KerberosService - Running [kadmin, -r, VIASAT.IO, -p, api/[email protected], -kt, /path/to/keytab-VIASAT.IO, -q, add_principal -pw **the same random stuff** krbtgt/[email protected]] WARNING: no policy specified for krbtgt/[email protected]; defaulting to no policy add_principal: Principal or policy already exists while creating "krbtgt/[email protected]". Authenticating as principal api/[email protected] with keytab /path/to/keytab-VIASAT.IO. The principals do not exist before this point, I am 100% certain. In our system, all realms are backed by the same LDAP database, under the container cn=Kerberos,dc=viasat,dc=io. So we have separate krbRealmContainer objects cn=VIASAT.IO, cn=A.VIASAT.IO, and so on. What’s happening, based on my manual duplication of these steps, is that the A.VIASAT.IO version of the principal is somehow “spilling over” into VIASAT.IO. After diving into the code, it appears this behavior is intentional: is_principal_in_realm() in ldap_misc.c explicitly allows these cross-realm TGS principals, no matter which krbRealmContainer they’re in. So I have two questions: first, is this behavior truly expected, or is there some kind of bug here? It seems like a nice shortcut, but I want to make sure either way before we start depending on it in production. Second, if it is expected, it’d be really nice for this feature to be documented. Is it OK if I send in a pull request on GitHub, or some other patch for the docs to reflect this? Thanks, Stephan Kemper ViaSat, Inc. ________________________________________________ Kerberos mailing list [email protected] https://mailman.mit.edu/mailman/listinfo/kerberos
