krb5/Fix-kadmin-k-with-fallback-or-referral-realm.patch
2021-07-14 16:32:30 -04:00

66 lines
2.8 KiB
Diff

From ddbd548562d951d327a10c9dcb975418427f6fea Mon Sep 17 00:00:00 2001
From: Greg Hudson <ghudson@mit.edu>
Date: Mon, 7 Jun 2021 15:00:41 -0400
Subject: [PATCH] Fix kadmin -k with fallback or referral realm
kadmin -k produces a client principal name with
krb5_sname_to_principal(), but it gets converted to a string and back
due to the signature of kadm5_init_with_skey(), which loses track of
the name type, so no canonicalization is performed.
In libkadm5clnt initialization, recognize the important subset of this
case--an empty realm indicates either fallback processing or the
referral realm--and restore the host-based name type so that the
client principal can be canonicalized against the keytab.
ticket: 9013 (new)
(cherry picked from commit dcb79089276624d7ddf44e08d35bd6d7d7e557d2)
(cherry picked from commit cd8ff035f5b4720a8fc457355726f7bd0eab5eaa)
---
src/lib/kadm5/clnt/client_init.c | 7 +++++++
src/tests/t_kadmin.py | 12 ++++++++++++
2 files changed, 19 insertions(+)
diff --git a/src/lib/kadm5/clnt/client_init.c b/src/lib/kadm5/clnt/client_init.c
index aa1223bb3..0aaca701f 100644
--- a/src/lib/kadm5/clnt/client_init.c
+++ b/src/lib/kadm5/clnt/client_init.c
@@ -221,9 +221,16 @@ init_any(krb5_context context, char *client_name, enum init_type init_type,
return KADM5_MISSING_KRB5_CONF_PARAMS;
}
+ /*
+ * Parse the client name. If it has an empty realm, it is almost certainly
+ * a host-based principal using DNS fallback processing or the referral
+ * realm, so give it the appropriate name type for canonicalization.
+ */
code = krb5_parse_name(handle->context, client_name, &client);
if (code)
goto error;
+ if (init_type == INIT_SKEY && client->realm.length == 0)
+ client->type = KRB5_NT_SRV_HST;
/*
* Get credentials. Also does some fallbacks in case kadmin/fqdn
diff --git a/src/tests/t_kadmin.py b/src/tests/t_kadmin.py
index fe6a3cc2e..98453d92e 100644
--- a/src/tests/t_kadmin.py
+++ b/src/tests/t_kadmin.py
@@ -51,4 +51,16 @@ for i in range(200):
realm.run_kadmin(['addprinc', '-randkey', 'foo%d' % i])
realm.run_kadmin(['listprincs'], expected_msg='foo199')
+# Test kadmin -k with the default principal, with and without
+# fallback. This operation requires canonicalization against the
+# keytab in krb5_get_init_creds_keytab() as the
+# krb5_sname_to_principal() result won't have a realm. Try with and
+# without without fallback processing since the code paths are
+# different.
+mark('kadmin -k')
+realm.run([kadmin, '-k', 'getprinc', realm.host_princ])
+no_canon_conf = {'libdefaults': {'dns_canonicalize_hostname': 'false'}}
+no_canon = realm.special_env('no_canon', False, krb5_conf=no_canon_conf)
+realm.run([kadmin, '-k', 'getprinc', realm.host_princ], env=no_canon)
+
success('kadmin and kpasswd tests')