mneethiraj commented on code in PR #1324:
URL: https://github.com/apache/ranger/pull/1324#discussion_r4354373611
##########
security-admin/src/main/java/org/apache/ranger/biz/RoleDBStore.java:
##########
@@ -454,6 +461,117 @@ private void ensureRoleNameUpdateAllowed(String roleName)
throws Exception {
}
}
+ /**
+ * Rejects a new role whose nested roles contain it, directly or
transitively.
+ *
+ * The ref table can't be used here: when an earlier save referenced a
not-yet-existing role with
+ * createNonExistUserGroupRole=true (e.g. earlier in the same import), its
x_role_ref_role row is only written
+ * after commit, so that edge exists only in the stored role JSON. So walk
the new role's nested roles downwards
+ * using their stored definitions. Each role is loaded at most once; a
role with no nested roles costs nothing.
+ */
+ private void ensureRoleNotNestedInItself(RangerRole role) {
+ Set<String> visited = new HashSet<>();
+ Deque<String> pending = new ArrayDeque<>();
+
+ for (RangerRole.RoleMember member : role.getRoles()) {
+ if (member != null && StringUtils.isNotEmpty(member.getName())) {
+ pending.add(member.getName());
+ }
+ }
+
+ while (!pending.isEmpty()) {
+ String nestedRoleName = pending.poll();
+
+ if (StringUtils.equals(nestedRoleName, role.getName())) {
+ throw createNestingCycleException(role.getName());
+ }
+
+ if (!visited.add(nestedRoleName)) {
+ continue;
+ }
+
+ XXRole xxNestedRole =
daoMgr.getXXRole().findByRoleName(nestedRoleName);
Review Comment:
Consider replacing 493 to 508 with a new method in XXRoleDao to retrieve
the list of refereced roles:
```
XXRoleDao roleDao = daoMgr.getXXRole();
while (!pending.isEmpty()) {
...
Collection<String> refRoleNames =
roleDao.getRoleMemberNames(memberRoleName);
pending.add(refRoleNames);
}
```
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