Make gss_krb5_set_allowable_enctypes work for the acceptor

With the addition of enctype negotiation in 1.7, a gss-krb5 acceptor
can choose an enctype for the acceptor subkey other than the one in
the keytab.  If the resulting security context will be exported and
re-imported by another gss-krb5 implementation (such as one in the
kernel), the acceptor needs a way to restrict the set of negotiated
enctypes to those supported by the other implementation.  We had that
functionality for the initiator already in the form of
gss_krb5_set_allowable_enctypes; this change makes it work for the
acceptor as well.

ticket: 6852
target_version: 1.9.1
tags: pullup

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@24603 dc483132-0cff-0310-8789-dd5450dbe970

diff --git a/src/lib/gssapi/krb5/accept_sec_context.c b/src/lib/gssapi/krb5/accept_sec_context.c
index 9d40f68c605f0e941c3feea52a3d0d602f5c4913..c3cb2f19e76fb2a6e45d8ce8164802116b61026f 100644 (file)
--- a/src/lib/gssapi/krb5/accept_sec_context.c
+++ b/src/lib/gssapi/krb5/accept_sec_context.c
@@ -623,6 +623,15 @@ kg_accept_krb5(minor_status, context_handle,
         goto fail;
     }
 
+    /* Limit the encryption types negotiated (if requested). */
+    if (cred->req_enctypes) {
+        if ((code = krb5_set_default_tgs_enctypes(context,
+                                                  cred->req_enctypes))) {
+            major_status = GSS_S_FAILURE;
+            goto fail;
+        }
+    }
+
     if ((code = krb5_rd_req(context, &auth_context, &ap_req,
                             cred->default_identity ? NULL : cred->name->princ,
                             cred->keytab,