Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / AuthenticationManager.cs / 1407647 / AuthenticationManager.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
namespace System.Net {
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Configuration;
using System.Globalization;
using System.Net.Configuration;
using System.Reflection;
using System.Security.Authentication.ExtendedProtection;
using System.Security.Permissions;
using System;
using System.Threading;
using System.Diagnostics;
//
// A contract that applications can use to restrict auth scenarios in current appDomain
//
public interface ICredentialPolicy
{
bool ShouldSendCredential(Uri challengeUri, WebRequest request, NetworkCredential credential, IAuthenticationModule authenticationModule);
}
///
/// Manages the authentication modules called during the client authentication
/// process.
///
public class AuthenticationManager {
//also used as a lock object
private static PrefixLookup s_ModuleBinding = new PrefixLookup();
private static ArrayList s_ModuleList;
private static ICredentialPolicy s_ICredentialPolicy;
private static SpnDictionary m_SpnDictionary = new SpnDictionary();
private static TriState s_OSSupportsExtendedProtection = TriState.Unspecified;
private static TriState s_SspSupportsExtendedProtection = TriState.Unspecified;
// not creatable...
//
private AuthenticationManager() {
}
//
//
//
public static ICredentialPolicy CredentialPolicy {
get {
return s_ICredentialPolicy;
}
set {
ExceptionHelper.ControlPolicyPermission.Demand();
s_ICredentialPolicy = value;
}
}
//
//
public static StringDictionary CustomTargetNameDictionary {
get {return m_SpnDictionary;}
}
//
// This will give access to some internal methods
//
internal static SpnDictionary SpnDictionary {
get {return m_SpnDictionary;}
}
//
//
internal static void EnsureConfigLoaded() {
try {
object o = ModuleList;
}
catch (Exception e) {
if (e is ThreadAbortException || e is OutOfMemoryException || e is StackOverflowException)
throw;
// A Config System has circular dependency on HttpWebRequest so they call this method to
// trigger the config. For some reason they don't want any exceptions from here.
}
}
internal static bool OSSupportsExtendedProtection {
get {
if (s_OSSupportsExtendedProtection == TriState.Unspecified) {
if (ComNetOS.IsWin7) {
s_OSSupportsExtendedProtection = TriState.True;
}
else {
if (SspSupportsExtendedProtection) {
// EP is considered supported only if both SSPs and http.sys support CBT/EP.
// We don't support scenarios where e.g. only SSPs support CBT. In such cases
// the customer needs to patch also http.sys (even if he may not use it).
if (UnsafeNclNativeMethods.HttpApi.ExtendedProtectionSupported) {
s_OSSupportsExtendedProtection = TriState.True;
}
else {
s_OSSupportsExtendedProtection = TriState.False;
}
}
else {
s_OSSupportsExtendedProtection = TriState.False;
}
}
}
return (s_OSSupportsExtendedProtection == TriState.True);
}
}
internal static bool SspSupportsExtendedProtection {
get {
if (s_SspSupportsExtendedProtection == TriState.Unspecified) {
if (ComNetOS.IsWin7) {
s_SspSupportsExtendedProtection = TriState.True;
}
else {
// Perform a loopback NTLM authentication to determine whether the underlying OS supports
// extended protection
ContextFlags clientFlags = ContextFlags.Connection | ContextFlags.InitIdentify;
NTAuthentication client = new NTAuthentication(false, NtlmClient.AuthType,
SystemNetworkCredential.defaultCredential, "http/localhost", clientFlags, null);
try {
NTAuthentication server = new NTAuthentication(true, NtlmClient.AuthType,
SystemNetworkCredential.defaultCredential, null, ContextFlags.Connection, null);
try {
SecurityStatus status;
byte[] blob = null;
while (!server.IsCompleted) {
blob = client.GetOutgoingBlob(blob, true, out status);
blob = server.GetOutgoingBlob(blob, true, out status);
}
if (server.OSSupportsExtendedProtection) {
s_SspSupportsExtendedProtection = TriState.True;
}
else {
if (Logging.On) Logging.PrintWarning(Logging.Web, SR.GetString(SR.net_ssp_dont_support_cbt));
s_SspSupportsExtendedProtection = TriState.False;
}
}
finally {
server.CloseContext();
}
}
finally {
client.CloseContext();
}
}
}
return (s_SspSupportsExtendedProtection == TriState.True);
}
}
//
// ModuleList - static initialized property -
// contains list of Modules used for Authentication
//
private static ArrayList ModuleList {
get {
//
// GetConfig() might use us, so we have a circular dependency issue,
// that causes us to nest here, we grab the lock, only
// if we haven't initialized, or another thread is busy in initialization
//
if (s_ModuleList == null) {
lock (s_ModuleBinding) {
if (s_ModuleList == null) {
GlobalLog.Print("AuthenticationManager::Initialize(): calling ConfigurationManager.GetSection()");
// This will never come back as null. Additionally, it will
// have the items the user wants available.
List authenticationModuleTypes = AuthenticationModulesSectionInternal.GetSection().AuthenticationModules;
//
// Should be registered in a growing list of encryption/algorithm strengths
// basically, walk through a list of Types, and create new Auth objects
// from them.
//
// order is meaningful here:
// load the registered list of auth types
// with growing level of encryption.
//
ArrayList moduleList = new ArrayList();
IAuthenticationModule moduleToRegister;
foreach (Type type in authenticationModuleTypes){
try {
moduleToRegister = Activator.CreateInstance(type,
BindingFlags.CreateInstance
| BindingFlags.Instance
| BindingFlags.NonPublic
| BindingFlags.Public,
null, // Binder
new object[0], // no arguments
CultureInfo.InvariantCulture
) as IAuthenticationModule;
if (moduleToRegister != null) {
GlobalLog.Print("WebRequest::Initialize(): Register:" + moduleToRegister.AuthenticationType);
RemoveAuthenticationType(moduleList, moduleToRegister.AuthenticationType);
moduleList.Add(moduleToRegister);
}
}
catch (Exception exception) {
//
// ignore failure (log exception for debugging)
//
GlobalLog.Print("AuthenticationManager::constructor failed to initialize: " + exception.ToString());
}
}
s_ModuleList = moduleList;
}
}
}
return s_ModuleList;
}
}
private static void RemoveAuthenticationType(ArrayList list, string typeToRemove) {
for (int i=0; i< list.Count; ++i) {
if (string.Compare(((IAuthenticationModule)list[i]).AuthenticationType, typeToRemove, StringComparison.OrdinalIgnoreCase) ==0) {
list.RemoveAt(i);
break;
}
}
}
///
/// Call each registered authentication module to determine the first module that
/// can respond to the authentication request.
///
public static Authorization Authenticate(string challenge, WebRequest request, ICredentials credentials) {
//
// parameter validation
//
if (request == null) {
throw new ArgumentNullException("request");
}
if (credentials == null) {
throw new ArgumentNullException("credentials");
}
if (challenge==null) {
throw new ArgumentNullException("challenge");
}
GlobalLog.Print("AuthenticationManager::Authenticate() challenge:[" + challenge + "]");
Authorization response = null;
HttpWebRequest httpWebRequest = request as HttpWebRequest;
if (httpWebRequest != null && httpWebRequest.CurrentAuthenticationState.Module != null)
{
response = httpWebRequest.CurrentAuthenticationState.Module.Authenticate(challenge, request, credentials);
}
else
{
// This is the case where we would try to find the module on the first server challenge
lock (s_ModuleBinding) {
//
// fastest way of iterating on the ArryList
//
for (int i = 0; i < ModuleList.Count; i++) {
IAuthenticationModule authenticationModule = (IAuthenticationModule)ModuleList[i];
//
// the AuthenticationModule will
// 1) return a valid string on success
// 2) return null if it knows it cannot respond
// 3) throw if it could have responded but unexpectedly failed to do so
//
if (httpWebRequest != null) {
httpWebRequest.CurrentAuthenticationState.Module = authenticationModule;
}
response = authenticationModule.Authenticate(challenge, request, credentials);
if (response!=null) {
//
// found the Authentication Module, return it
//
GlobalLog.Print("AuthenticationManager::Authenticate() found IAuthenticationModule:[" + authenticationModule.AuthenticationType + "]");
break;
}
}
}
}
return response;
}
// These four authentication modules require a Channel Binding Token to be able to preauthenticate over https.
// After a successful authentication, they will cache the CBT used on the ServicePoint. In order to PreAuthenticate,
// they require that a CBT has previously been cached. Any other module should be allowed to try preauthentication
// without a cached CBT
#if DEBUG
// This method is only called as part of an assert
private static bool ModuleRequiresChannelBinding(IAuthenticationModule authenticationModule)
{
return (authenticationModule is NtlmClient || authenticationModule is KerberosClient ||
authenticationModule is NegotiateClient || authenticationModule is DigestClient);
}
#endif
///
/// Pre-authenticates a request.
///
public static Authorization PreAuthenticate(WebRequest request, ICredentials credentials) {
GlobalLog.Print("AuthenticationManager::PreAuthenticate() request:" + ValidationHelper.HashString(request) + " credentials:" + ValidationHelper.HashString(credentials));
if (request == null) {
throw new ArgumentNullException("request");
}
if (credentials == null) {
return null;
}
HttpWebRequest httpWebRequest = request as HttpWebRequest;
IAuthenticationModule authenticationModule;
if (httpWebRequest == null)
return null;
//
// PrefixLookup is thread-safe
//
string moduleName = s_ModuleBinding.Lookup(httpWebRequest.ChallengedUri.AbsoluteUri) as string;
GlobalLog.Print("AuthenticationManager::PreAuthenticate() s_ModuleBinding.Lookup returns:" + ValidationHelper.ToString(moduleName));
if (moduleName == null)
return null;
authenticationModule = findModule(moduleName);
if (authenticationModule == null)
{
// The module could have been unregistered
// No preauthentication is possible
return null;
}
// prepopulate the channel binding token so we can try preauth (but only for modules that actually need it!)
if (httpWebRequest.ChallengedUri.Scheme == Uri.UriSchemeHttps)
{
object binding = httpWebRequest.ServicePoint.CachedChannelBinding;
#if DEBUG
// the ModuleRequiresChannelBinding method is only compiled in DEBUG so the assert must be restricted to DEBUG
// as well
// If the authentication module does CBT, we require that it also caches channel bindings.
System.Diagnostics.Debug.Assert(!(binding == null && ModuleRequiresChannelBinding(authenticationModule)));
#endif
// can also be DBNull.Value, indicating "we previously succeeded without getting a CBT."
// (ie, unpatched SSP talking to a partially-hardened server)
ChannelBinding channelBinding = binding as ChannelBinding;
if (channelBinding != null)
{
httpWebRequest.CurrentAuthenticationState.TransportContext = new CachedTransportContext(channelBinding);
}
}
// Otherwise invoke the PreAuthenticate method
// we're guaranteed that CanPreAuthenticate is true because we check before calling BindModule()
Authorization authorization = authenticationModule.PreAuthenticate(request, credentials);
if (authorization != null && !authorization.Complete && httpWebRequest != null)
httpWebRequest.CurrentAuthenticationState.Module = authenticationModule;
GlobalLog.Print("AuthenticationManager::PreAuthenticate() IAuthenticationModule.PreAuthenticate() returned authorization:" + ValidationHelper.HashString(authorization));
return authorization;
}
///
/// Registers an authentication module with the authentication manager.
///
public static void Register(IAuthenticationModule authenticationModule) {
ExceptionHelper.UnmanagedPermission.Demand();
if (authenticationModule == null) {
throw new ArgumentNullException("authenticationModule");
}
GlobalLog.Print("AuthenticationManager::Register() registering :[" + authenticationModule.AuthenticationType + "]");
lock (s_ModuleBinding) {
IAuthenticationModule existentModule = findModule(authenticationModule.AuthenticationType);
if (existentModule != null) {
ModuleList.Remove(existentModule);
}
ModuleList.Add(authenticationModule);
}
}
///
/// Unregisters authentication modules for an authentication scheme.
///
public static void Unregister(IAuthenticationModule authenticationModule) {
ExceptionHelper.UnmanagedPermission.Demand();
if (authenticationModule == null) {
throw new ArgumentNullException("authenticationModule");
}
GlobalLog.Print("AuthenticationManager::Unregister() unregistering :[" + authenticationModule.AuthenticationType + "]");
lock (s_ModuleBinding) {
if (!ModuleList.Contains(authenticationModule)) {
throw new InvalidOperationException(SR.GetString(SR.net_authmodulenotregistered));
}
ModuleList.Remove(authenticationModule);
}
}
///
/// Unregisters authentication modules for an authentication scheme.
///
public static void Unregister(string authenticationScheme) {
ExceptionHelper.UnmanagedPermission.Demand();
if (authenticationScheme == null) {
throw new ArgumentNullException("authenticationScheme");
}
GlobalLog.Print("AuthenticationManager::Unregister() unregistering :[" + authenticationScheme + "]");
lock (s_ModuleBinding) {
IAuthenticationModule existentModule = findModule(authenticationScheme);
if (existentModule == null) {
throw new InvalidOperationException(SR.GetString(SR.net_authschemenotregistered));
}
ModuleList.Remove(existentModule);
}
}
///
///
/// Returns a list of registered authentication modules.
///
///
public static IEnumerator RegisteredModules {
get {
return ModuleList.GetEnumerator();
}
}
///
///
/// Binds an authentication response to a request for pre-authentication.
///
///
// Create binding between an authorization response and the module
// generating that response
// This association is used for deciding which module to invoke
// for preauthentication purposes
internal static void BindModule(Uri uri, Authorization response, IAuthenticationModule module) {
GlobalLog.Assert(module.CanPreAuthenticate, "AuthenticationManager::BindModule()|module.CanPreAuthenticate == false");
if (response.ProtectionRealm!=null) {
// The authentication module specified which Uri prefixes
// will be preauthenticated
string[] prefix = response.ProtectionRealm;
for (int k=0; k=signature.Length) {
int firstQuote = -1, secondQuote = -1;
for (int i = 0; i < challenge.Length && index < 0; i++)
{
// Search for the quotes
if (challenge[i]=='\"')
{
if (firstQuote <= secondQuote)
firstQuote = i;
else
secondQuote = i;
}
// We've found both ends of an unquoted segment (could be whole challenge), search inside for the signature.
if (i==challenge.Length-1 || (challenge[i]=='\"' && firstQuote>secondQuote))
{
// see if the portion of challenge out of the quotes contains
// the signature of the IAuthenticationModule
if (i==challenge.Length-1)
firstQuote = challenge.Length;
// unquoted segment is too small to hold a scheme name, ie: scheme param="value",a=""
if (firstQuote= 0)
{
// Verify the signature is a full scheme name match, not a partial match or a parameter name:
if ((index == 0 || challenge[index - 1] == ' ' || challenge[index - 1] == ',') &&
(index + signature.Length == challenge.Length || challenge[index + signature.Length] == ' ' || challenge[index + signature.Length] == ','))
{
break;
}
// Only a partial match / param name, but maybe there is another occurance of the signature later?
checkLength -= index - checkstart + 1;
checkstart = index + 1;
}
} while (index >= 0);
}
}
}
GlobalLog.Print("AuthenticationManager::FindSubstringNotInQuotes(" + challenge + ", " + signature + ")=" + index.ToString());
return index;
}
//
// Helper for FindSubstringNotInQuotes
// Find the FIRST possible index of a signature.
private static int IndexOf(string challenge, string lwrCaseSignature, int start, int count)
{
count += start + 1 - lwrCaseSignature.Length;
for (; start < count; ++start)
{
int i = 0;
for (; i < lwrCaseSignature.Length; ++i)
{
// force a challenge char to lowecase (safe assuming it works on trusted ASCII source)
if ((challenge[start+i] | 0x20) != lwrCaseSignature[i])
break;
}
if (i == lwrCaseSignature.Length)
return start;
}
return -1;
}
//
// this method is called by the IAuthenticationModule implementations
// (mainly Digest) to safely find their list of parameters in a challenge.
// it returns the index of the first ',' that is not included in quotes,
// -1 is returned on error or end of string. on return offset contains the
// index of the first '=' that is not included in quotes, -1 if no '=' was found.
//
internal static int SplitNoQuotes(string challenge, ref int offset) {
// GlobalLog.Print("SplitNoQuotes([" + challenge + "], " + offset.ToString() + ")");
//
// save offset
//
int realOffset = offset;
//
// default is not found
//
offset = -1;
if (challenge != null && realOffsetsecondQuote means we are in a quoted string
//
if (firstQuote>secondQuote && challenge[i]=='\\' && i+1 < challenge.Length && challenge[i+1]=='\"') {
//
// skip <\"> when in a quoted string
//
i++;
}
else if (challenge[i]=='\"') {
if (firstQuote <= secondQuote) {
firstQuote = i;
}
else {
secondQuote = i;
}
}
else if (challenge[i]=='=' && firstQuote<=secondQuote && offset<0) {
offset = i;
}
else if (challenge[i]==',' && firstQuote<=secondQuote) {
return i;
}
}
}
return -1;
}
#if !FEATURE_PAL
internal static Authorization GetGroupAuthorization(IAuthenticationModule thisModule, string token, bool finished, NTAuthentication authSession, bool shareAuthenticatedConnections, bool mutualAuth) {
return
new Authorization(
token,
finished,
(shareAuthenticatedConnections) ? null : (thisModule.GetType().FullName + "/" + authSession.UniqueUserId),
mutualAuth);
}
#endif // !FEATURE_PAL
}; // class AuthenticationManager
//
// This internal class implements a data structure which can be
// used for storing a set of objects keyed by string prefixes
// Looking up an object given a string returns the value associated
// with the longest matching prefix
// (A prefix "matches" a string IFF the string starts with that prefix
// The degree of the match is prefix length)
//
// The class has a configurable maximum capacity. When adding items, if the
// list is over capacity, then the least recently used (LRU) item is dropped.
//
internal class PrefixLookup {
// Do not go over this limit. Discard old data elements
// Longer lists suffer a search penalty
private const int defaultCapacity = 100;
private int capacity = defaultCapacity;
// LRU list - Least Recently Used.
// Add new items to the front. Drop items from the end if beyond capacity.
// Promote used items to the top.
private LinkedList lruList = new LinkedList();
private class PrefixValuePair {
public string prefix;
public object value;
public PrefixValuePair(string pre, object val) {
prefix = pre;
value = val;
}
}
#if DEBUG
// this method is only called by test code
internal int Capacity {
get { return capacity; }
set {
lock (lruList) {
if (value <= 0) {
// Disabled, flush list
capacity = 0;
lruList.Clear();
} else {
capacity = value;
// Ensure list is still within capacity
while (lruList.Count > capacity) {
lruList.RemoveLast();
}
}
}
}
}
#endif
internal void Add(string prefix, object value) {
Debug.Assert(prefix != null, "PrefixLookup.Add; prefix must not be null");
Debug.Assert(prefix.Length > 0, "PrefixLookup.Add; prefix must not be empty");
Debug.Assert(value != null, "PrefixLookup.Add; value must not be null");
if (capacity == 0 || prefix == null || prefix.Length == 0 || value == null)
return;
// writers are locked
lock (lruList) {
// Special case duplicate check at start of list, very common
if (lruList.First != null && lruList.First.Value.prefix.Equals(prefix)) {
// Already in list, update value
lruList.First.Value.value = value;
} else {
// New entry
// Duplicates will just be pushed down and eventually discarded
lruList.AddFirst(new PrefixValuePair(prefix, value));
// If full, drop the least recently used
while (lruList.Count > capacity) {
lruList.RemoveLast();
}
}
}
}
internal object Lookup(string lookupKey) {
Debug.Assert(lookupKey != null, "PrefixLookup.Lookup; lookupKey must not be null");
Debug.Assert(lookupKey.Length > 0, "PrefixLookup.Lookup; lookupKey must not be empty");
if (lookupKey==null || lookupKey.Length == 0|| lruList.Count == 0) {
return null;
}
LinkedListNode mostSpecificMatch = null;
lock (lruList) {
//
// Normally readers don't need to be locked, but if the value is found
// then it is promoted to the top of the list.
//
// Oh well, do it the slow way, search for the longest partial match
string prefix;
int longestMatchPrefix = 0;
for (LinkedListNode pairNode = lruList.First;
pairNode != null; pairNode = pairNode.Next) {
//
// check if the match is better than the current-most-specific match
//
prefix = pairNode.Value.prefix;
if (prefix.Length > longestMatchPrefix && lookupKey.StartsWith(prefix)) {
//
// Yes-- update the information about currently preferred match
//
longestMatchPrefix = prefix.Length;
mostSpecificMatch = pairNode;
if (longestMatchPrefix == lookupKey.Length)
break; // Exact match, optimal solution.
}
}
if (mostSpecificMatch != null && mostSpecificMatch != lruList.First) {
// We have a match and it's not the first element, move it up in the list
lruList.Remove(mostSpecificMatch);
lruList.AddFirst(mostSpecificMatch);
}
}
return mostSpecificMatch != null ? mostSpecificMatch.Value.value : null;
}
} // class PrefixLookup
} // namespace System.Net
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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