public void securityCheck(Acl acl, int changeType) {
if ((SecurityContextHolder.getContext() == null)
|| (SecurityContextHolder.getContext().getAuthentication() == null)
|| !SecurityContextHolder.getContext().getAuthentication().isAuthenticated()) {
throw new AccessDeniedException("Authenticated principal required to operate with ACLs");
}
Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
// Check if authorized by virtue of ACL ownership
Sid currentUser = new PrincipalSid(authentication);
if (currentUser.equals(acl.getOwner())
&& ((changeType == CHANGE_GENERAL) || (changeType == CHANGE_OWNERSHIP))) {
return;
}
// Not authorized by ACL ownership; try via adminstrative permissions
GrantedAuthority requiredAuthority = null;
if (changeType == CHANGE_AUDITING) {
requiredAuthority = this.gaModifyAuditing;
} else if (changeType == CHANGE_GENERAL) {
requiredAuthority = this.gaGeneralChanges;
} else if (changeType == CHANGE_OWNERSHIP) {
requiredAuthority = this.gaTakeOwnership;
} else {
throw new IllegalArgumentException("Unknown change type");
}
// Iterate this principal's authorities to determine right
GrantedAuthority[] auths = authentication.getAuthorities();
for (int i = 0; i < auths.length; i++) {
if (requiredAuthority.equals(auths[i])) {
return;
}
}
// Try to get permission via ACEs within the ACL
Sid[] sids = sidRetrievalStrategy.getSids(authentication);
if (acl.isGranted(new Permission[] {BasePermission.ADMINISTRATION}, sids, false)) {
return;
}
throw new AccessDeniedException(
"Principal does not have required ACL permissions to perform requested operation");
}