[krbdev.mit.edu #7704] Anonymous kadmin does not work

[Greg Hudson via RT]

When anonymous support was added, the intent was that kadmin -n would 
work for authenticating anonymously to kadmind, and permissions could be 
granted to the anonymous principal to do things like create new host 
principals.

This (1) does not work at all on the admin server side, (2) has a bad 
user experience on the admin client side, and (3) is awkward to use for 
creating host principals.

Problem #1 is that server_stubs.c checks the name type returned by 
gss_display_name() in two places, doing a pointer comparison (!) against 
gss_nt_krb5_name.  For the anonymous principal, gss_display_name() 
returns a name type of GSS_C_NT_ANONYMOUS, so init_2_svc() rejects the 
connection.

Problem #2 is that kadmin -n doesn't pick a client principal, so you 
have to manually enter '-p @REALMNAME' or '-p 
WELLKNOWN/ANONYMOUS at REALMNAME' or you get an obscure error.  kadmin -n 
should work as transparently as kinit -n.

Problem #3 is that we don't currently have a way to create a principal 
and extract its random key at the same time.  So you have to create the 
host principal with a password, then use it (e.g. "kadmin -p 
host/hostname -q 'xst host/hostname'") to randomize and extract.  Within 
a script, this would be pretty awkward as the script would have to 
choose a secure temporary password.