Only retrieve password policies in pam_auth when WBFLAG_PAM_GET_PWD_POLICY is set.

This essentially re-establishes r14496 (2155bb0535)
which was undone in r17723 (43bd8c00ab) for
reasons that are unclear to me. Maybe I am being too naive.

Now we do again only retrieve the password policy when called from
the pam_winbind module. This fixes logons delegated to AD trusted
domain controllers: We need to connect to the sam to retrieve the
password policy. But auhtenticated session setup is not possible
when contacting the trusted domain dc and afterwards, SamrConnect
also fails with whatever credentials and method used.

Michael

source/nsswitch/pam_winbind.c

@@ -1201,6 +1201,7 @@ static int winbind_auth_request(pam_handle_t * pamh,
 	request.data.auth.uid = -1;
 
 	request.flags = WBFLAG_PAM_INFO3_TEXT |
+			WBFLAG_PAM_GET_PWD_POLICY |
 			WBFLAG_PAM_CONTACT_TRUSTDOM;
 
 	if (ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {

source/nsswitch/winbind_struct_protocol.h

@@ -194,7 +194,7 @@ typedef struct winbindd_gr {
 #define WBFLAG_PAM_KRB5			0x00001000
 #define WBFLAG_PAM_FALLBACK_AFTER_KRB5	0x00002000
 #define WBFLAG_PAM_CACHED_LOGIN		0x00004000
-#define WBFLAG_PAM_GET_PWD_POLICY	0x00008000	/* not used */
+#define WBFLAG_PAM_GET_PWD_POLICY	0x00008000
 
 /* generic request flags */
 #define WBFLAG_QUERY_ONLY		0x00000020	/* not used */

source/winbindd/winbindd_pam.c

@@ -1593,6 +1593,8 @@ process_result:
 			}
 		}
 
+
+		if (state->request.flags & WBFLAG_PAM_GET_PWD_POLICY) {
 			result = fillup_password_policy(domain, state);
 
 			if (!NT_STATUS_IS_OK(result) 
@@ -1601,6 +1603,7 @@ process_result:
 				DEBUG(10,("Failed to get password policies: %s\n", nt_errstr(result)));
 				goto done;
 			}
+		}
 
 		result = NT_STATUS_OK;		
 	}