internal void Intersect(ArrayList entries, NameValuePermission target)
{
if (null == target)
{
_tree = null;
_entry = null;
}
else
{
if (null != _entry)
{
entries.Remove(_entry);
_entry = _entry.Intersect(target._entry);
entries.Add(_entry);
}
else if (null != target._entry)
{
_entry = target._entry.Intersect(null);
entries.Add(_entry);
}
if (null != _tree)
{
int count = _tree.Length;
for (int i = 0; i < _tree.Length; ++i)
{
NameValuePermission kvtree = target.CheckKeyForValue(_tree[i]._value);
if (null != kvtree)
{ // does target tree contain our value
_tree[i].Intersect(entries, kvtree);
}
else
{
_tree[i] = null;
--count;
}
}
if (0 == count)
{
_tree = null;
}
else if (count < _tree.Length)
{
NameValuePermission[] kvtree = new NameValuePermission[count];
for (int i = 0, j = 0; i < _tree.Length; ++i)
{
if (null != _tree[i])
{
kvtree[j++] = _tree[i];
}
}
_tree = kvtree;
}
}
}
}
private void Add(NameValuePermission permit)
{
NameValuePermission[] tree = _tree;
int length = ((null != tree) ? tree.Length : 0);
NameValuePermission[] newtree = new NameValuePermission[1 + length];
for (int i = 0; i < newtree.Length - 1; ++i)
{
newtree[i] = tree[i];
}
newtree[length] = permit;
Array.Sort(newtree);
_tree = newtree;
}
private NameValuePermission CheckKeyForValue(string keyInQuestion)
{
NameValuePermission[] valuetree = _tree; // _tree won't mutate but Add will replace it
if (null != valuetree)
{
for (int i = 0; i < valuetree.Length; ++i)
{
NameValuePermission permitValue = valuetree[i];
if (String.Equals(keyInQuestion, permitValue._value, StringComparison.OrdinalIgnoreCase))
{
return(permitValue);
}
}
}
return(null);
}
private NameValuePermission(NameValuePermission permit) // deep-copy
{
_value = permit._value;
_entry = permit._entry;
_tree = permit._tree;
if (null != _tree)
{
NameValuePermission[] tree = (_tree.Clone() as NameValuePermission[]);
for (int i = 0; i < tree.Length; ++i)
{
if (null != tree[i]) // WebData 98488
{
tree[i] = tree[i].CopyNameValue(); // deep copy
}
}
_tree = tree;
}
}
static internal void AddEntry(NameValuePermission kvtree, ArrayList entries, DBConnectionString entry)
{
Debug.Assert(null != entry, "null DBConnectionString");
if (null != entry.KeyChain)
{
for (NameValuePair keychain = entry.KeyChain; null != keychain; keychain = keychain.Next)
{
NameValuePermission kv;
kv = kvtree.CheckKeyForValue(keychain.Name);
if (null == kv)
{
kv = new NameValuePermission(keychain.Name);
kvtree.Add(kv); // add directly into live tree
}
kvtree = kv;
kv = kvtree.CheckKeyForValue(keychain.Value);
if (null == kv)
{
DBConnectionString insertValue = ((null != keychain.Next) ? null : entry);
kv = new NameValuePermission(keychain.Value, insertValue);
kvtree.Add(kv); // add directly into live tree
if (null != insertValue)
{
entries.Add(insertValue);
}
}
else if (null == keychain.Next) // shorter chain potential
{
if (null != kv._entry)
{
Debug.Assert(entries.Contains(kv._entry), "entries doesn't contain entry");
entries.Remove(kv._entry);
kv._entry = kv._entry.Intersect(entry); // union new restrictions into existing tree
}
else
{
kv._entry = entry;
}
entries.Add(kv._entry);
}
kvtree = kv;
}
}
else // global restrictions, MDAC 84443
{
DBConnectionString kentry = kvtree._entry;
if (null != kentry)
{
Debug.Assert(entries.Contains(kentry), "entries doesn't contain entry");
entries.Remove(kentry);
kvtree._entry = kentry.Intersect(entry);
}
else
{
kvtree._entry = entry;
}
entries.Add(kvtree._entry);
}
}
internal bool CheckValueForKeyPermit(DBConnectionString parsetable)
{
if (null == parsetable)
{
return(false);
}
bool hasMatch = false;
NameValuePermission[] keytree = _tree; // _tree won't mutate but Add will replace it
if (null != keytree)
{
hasMatch = parsetable.IsEmpty; // MDAC 86773
if (!hasMatch)
{
// which key do we follow the key-value chain on
for (int i = 0; i < keytree.Length; ++i)
{
NameValuePermission permitKey = keytree[i];
if (null != permitKey)
{
string keyword = permitKey._value;
#if DEBUG
Debug.Assert(null == permitKey._entry, "key member has no restrictions");
#endif
if (parsetable.ContainsKey(keyword))
{
string valueInQuestion = (string)parsetable[keyword];
// keyword is restricted to certain values
NameValuePermission permitValue = permitKey.CheckKeyForValue(valueInQuestion);
if (null != permitValue)
{
//value does match - continue the chain down that branch
if (permitValue.CheckValueForKeyPermit(parsetable))
{
hasMatch = true;
// adding a break statement is tempting, but wrong
// user can safetly extend their restrictions for current rule to include missing keyword
// i.e. Add("provider=sqloledb;integrated security=sspi", "data provider=", KeyRestrictionBehavior.AllowOnly);
// i.e. Add("data provider=msdatashape;provider=sqloledb;integrated security=sspi", "", KeyRestrictionBehavior.AllowOnly);
}
else // failed branch checking
{
return(false);
}
}
else // value doesn't match to expected values - fail here
{
return(false);
}
}
}
// else try next keyword
}
}
// partial chain match, either leaf-node by shorter chain or fail mid-chain if (null == _restrictions)
}
DBConnectionString entry = _entry;
if (null != entry)
{
// also checking !hasMatch is tempting, but wrong
// user can safetly extend their restrictions for current rule to include missing keyword
// i.e. Add("provider=sqloledb;integrated security=sspi", "data provider=", KeyRestrictionBehavior.AllowOnly);
// i.e. Add("provider=sqloledb;", "integrated security=;", KeyRestrictionBehavior.AllowOnly);
hasMatch = entry.IsSupersetOf(parsetable);
}
return(hasMatch); // mid-chain failure
}