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Optional backwards-compatible anon-pkinit behaviour

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* Anonymous pkinit responses from the KDC where the name
  type is not well-known (as issued by 7.5 KDCs and earlier)
  are accepted by the client.  There is no need for the client
  to strictly enforce the name type.

* With historical_anon_pkinit = true, the kinit(1) client's
  "--anonymous" option only performs anon pkinit, and does
  not require an '@' prefix for the realm argument.

* With historical_anon_realm = true, the KDC issues anon
  pkinit tickets with the legacy pre-7.0 "real" realm.
This commit is contained in:
Viktor Dukhovni
2019-07-14 23:02:57 -04:00
committed by Viktor Dukhovni
parent f40d393c83
commit fae8df3839
11 changed files with 141 additions and 27 deletions
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16
kuser/kinit.c
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@@ -669,7 +669,7 @@ get_new_tickets(krb5_context context,
}
} else if (pk_user_id || ent_user_id ||
krb5_principal_is_anonymous(context, principal, KRB5_ANON_MATCH_ANY)) {
/* nop */;
} else if (!interactive && passwd[0] == '\0') {
static int already_warned = 0;
@@ -1272,6 +1272,7 @@ main(int argc, char **argv)
struct sigaction sa;
#endif
krb5_boolean unique_ccache = FALSE;
krb5_boolean historical_anon_pkinit = FALSE;
int anonymous_pkinit = FALSE;
setprogname(argv[0]);
@@ -1300,6 +1301,9 @@ main(int argc, char **argv)
argc -= optidx;
argv += optidx;
krb5_appdefault_boolean(context, "kinit", NULL, "historical_anon_pkinit",
FALSE, &historical_anon_pkinit);
/*
* Open the keytab now, we use the keytab to determine the principal's
* realm when the requested principal has no realm.
@@ -1332,6 +1336,16 @@ main(int argc, char **argv)
krb5_err(context, 1, ret, "krb5_make_principal");
krb5_principal_set_type(context, principal, KRB5_NT_WELLKNOWN);
anonymous_pkinit = TRUE;
} else if (anonymous_flag && historical_anon_pkinit) {
char *realm = argc == 0 ? get_default_realm(context) :
argv[0][0] == '@' ? &argv[0][1] : argv[0];
ret = krb5_make_principal(context, &principal, realm,
KRB5_WELLKNOWN_NAME, KRB5_ANON_NAME, NULL);
if (ret)
krb5_err(context, 1, ret, "krb5_make_principal");
krb5_principal_set_type(context, principal, KRB5_NT_WELLKNOWN);
anonymous_pkinit = TRUE;
} else if (use_keytab || keytab_str) {
get_princ_kt(context, &principal, argv[0]);
} else {