Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / NameValuePermission.cs / 1 / NameValuePermission.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- #if ORACLE namespace System.Data.OracleClient { #else namespace System.Data.Common { #endif using System.Collections; using System.Data.Common; using System.Diagnostics; using System.Globalization; using System.Security; using System.Security.Permissions; using System.Text; [Serializable] // MDAC 83147 sealed internal class NameValuePermission : IComparable { // reused as both key and value nodes // key nodes link to value nodes // value nodes link to key nodes private string _value; // value node with (null != _restrictions) are allowed to match connection strings private DBConnectionString _entry; private NameValuePermission[] _tree; // with branches static internal readonly NameValuePermission Default = null;// = new NameValuePermission(String.Empty, new string[] { "File Name" }, KeyRestrictionBehavior.AllowOnly); internal NameValuePermission() { // root node } private NameValuePermission(string keyword) { _value = keyword; } private NameValuePermission(string value, DBConnectionString entry) { _value = value; _entry = entry; } 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; } } int IComparable.CompareTo(object a) { return StringComparer.Ordinal.Compare(_value, ((NameValuePermission)a)._value); } 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 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; } #if DATAPERMIT internal void DebugDump(string depth) { Debug.WriteLine(depth + "<" + _value + ">"); if (null != _tree) { for(int i = 0; i < _tree.Length; ++i) { _tree[i].DebugDump(depth+"-"); } } } #endif 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 DATAPERMIT Debug.WriteLine("DBDataPermission try keyword: <" + keyword + ">"); #endif #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 #if DATAPERMIT Debug.WriteLine("DBDataPermission failed branch checking: " + keyword); #endif return false; } } else { // value doesn't match to expected values - fail here #if DATAPERMIT Debug.WriteLine("DBDataPermission failed to match expected value " + keyword); #endif return false; } } } // else try next keyword } } // partial chain match, either leaf-node by shorter chain or fail mid-chain if (null == _restrictions) } #if DATAPERMIT else { Debug.WriteLine("leaf node <" + _entry.UsersConnectionString(true) + ">"); } #endif 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); } #if DATAPERMIT else if (!hasMatch) { Debug.WriteLine("DBDataPermission failed on non-terminal node " + _value); } #endif return hasMatch; // mid-chain failure } 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 DATAPERMIT Debug.WriteLine("DBDataPermission value: <" + permitValue._value + ">"); #endif if (String.Equals(keyInQuestion, permitValue._value, StringComparison.OrdinalIgnoreCase)) { return permitValue; } } } return null; } internal NameValuePermission CopyNameValue() { return new NameValuePermission(this); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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