Add a feature flag to control whether to fall back to the "other" policy

for chains that are still empty after the requested policy was loaded.


git-svn-id: svn+ssh://svn.openpam.org/svn/openpam/trunk@862 185d5e19-27fe-0310-9dcf-9bff6b9f3609

include/security/openpam.h

@@ -186,6 +186,7 @@ enum {
 	OPENPAM_VERIFY_POLICY_FILE,
 	OPENPAM_RESTRICT_MODULE_NAME,
 	OPENPAM_VERIFY_MODULE_FILE,
+	OPENPAM_FALLBACK_TO_OTHER,
 	OPENPAM_NUM_FEATURES
 };
 

lib/libpam/openpam_configure.c

@@ -467,8 +467,10 @@ openpam_configure(pam_handle_t *pamh,
 	for (fclt = 0; fclt < PAM_NUM_FACILITIES; ++fclt) {
 		if (pamh->chains[fclt] != NULL)
 			continue;
-		if (openpam_load_chain(pamh, PAM_OTHER, fclt) < 0)
-			goto load_err;
+		if (OPENPAM_FEATURE(FALLBACK_TO_OTHER)) {
+			if (openpam_load_chain(pamh, PAM_OTHER, fclt) < 0)
+				goto load_err;
+		}
 	}
 	RETURNC(PAM_SUCCESS);
 load_err:

lib/libpam/openpam_features.c

@@ -65,4 +65,9 @@ struct openpam_feature openpam_features[OPENPAM_NUM_FEATURES] = {
 	    "Verify ownership and permissions of module files",
 	    1
 	),
+	STRUCT_OPENPAM_FEATURE(
+	    FALLBACK_TO_OTHER,
+	    "Fall back to \"other\" policy for empty chains",
+	    1
+	),
 };