Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / _AuthenticationState.cs / 1 / _AuthenticationState.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net { using System.Collections; using System.IO; using System.Runtime.Serialization; using System.Security; using System.Security.Cryptography.X509Certificates; using System.Security.Permissions; using System.Text; using System.Text.RegularExpressions; using System.Threading; using System.Globalization; using System.Net.Security; ////// internal class AuthenticationState { // true if we already attempted pre-authentication regardless if it has been // 1) possible, // 2) succesfull or // 3) unsuccessfull private bool TriedPreAuth; internal Authorization Authorization; internal IAuthenticationModule Module; // used to request a special connection for NTLM internal string UniqueGroupId; // used to distinguish proxy auth from server auth private bool IsProxyAuth; // the Uri of the host we're authenticating (proxy/server) // used to match entries in the CredentialCache internal Uri ChallengedUri; private string ChallengedSpn; #if !FEATURE_PAL // this is the client's security context for SSPI based authentication // pared with the authentication module that set it. private NTAuthentication SecurityContext; internal NTAuthentication GetSecurityContext(IAuthenticationModule module) { GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::GetSecurityContext(" + module.AuthenticationType + ") returning NTAuthentication#" + ValidationHelper.HashString((object)module==(object)Module ? SecurityContext : null)); return (object)module==(object)Module ? SecurityContext : null; } internal void SetSecurityContext(NTAuthentication securityContext, IAuthenticationModule module) { GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::SetSecurityContext(" + module.AuthenticationType + ") was NTAuthentication#" + ValidationHelper.HashString(SecurityContext) + " now NTAuthentication#" + ValidationHelper.HashString(securityContext)); SecurityContext = securityContext; } #endif // !FEATURE_PAL internal HttpResponseHeader AuthenticateHeader { get { return IsProxyAuth ? HttpResponseHeader.ProxyAuthenticate : HttpResponseHeader.WwwAuthenticate; } } internal string AuthorizationHeader { get { return IsProxyAuth ? HttpKnownHeaderNames.ProxyAuthorization : HttpKnownHeaderNames.Authorization; } } internal HttpStatusCode StatusCodeMatch { get { return IsProxyAuth ? HttpStatusCode.ProxyAuthenticationRequired : HttpStatusCode.Unauthorized; } } internal AuthenticationState(bool isProxyAuth) { IsProxyAuth = isProxyAuth; } // // we need to do this to handle proxies in the correct way before // calling into the AuthenticationManager APIs // private void PrepareState(HttpWebRequest httpWebRequest) { Uri newUri = IsProxyAuth? httpWebRequest.ServicePoint.InternalAddress: httpWebRequest.Address; if ((object)ChallengedUri != (object)newUri) { if ((object)ChallengedUri == null || (object)ChallengedUri.Scheme != (object)newUri.Scheme || ChallengedUri.Host != newUri.Host || ChallengedUri.Port != newUri.Port) { // // must be a new server/port/scheme for this auth state, can happen on a redirect // ChallengedSpn = null; } ChallengedUri = newUri; } httpWebRequest.CurrentAuthenticationState = this; } // // // internal string GetComputeSpn(HttpWebRequest httpWebRequest) { if (ChallengedSpn != null) return ChallengedSpn; string spnKey = httpWebRequest.ChallengedUri.GetParts(UriComponents.Scheme | UriComponents.Host | UriComponents.Port | UriComponents.Path, UriFormat.SafeUnescaped); string spn = AuthenticationManager.SpnDictionary.InternalGet(spnKey); if (spn == null) { if (!IsProxyAuth && httpWebRequest.ServicePoint.InternalProxyServicePoint) { // Here the NT-Security folks need us to attempt a DNS lookup to figure out // the FQDN. only do the lookup for short names (no IP addresses or DNS names) // // Initialize a backup value spn = httpWebRequest.ChallengedUri.Host; if (httpWebRequest.ChallengedUri.HostNameType!=UriHostNameType.IPv6 && httpWebRequest.ChallengedUri.HostNameType!=UriHostNameType.IPv4 && spn.IndexOf('.') == -1) { try { // spn = Dns.InternalGetHostByName(spn).HostName; GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::GetComputeSpn() Dns returned host:" + ValidationHelper.ToString(spn)); } catch (Exception exception) { if (NclUtilities.IsFatal(exception)) throw; GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::GetComputeSpn() GetHostByName(host) failed:" + ValidationHelper.ToString(exception)); } } } else { // For this cases we already did a DNS lookup // spn = httpWebRequest.ServicePoint.Hostname; } spn = "HTTP/" + spn; spnKey = httpWebRequest.ChallengedUri.GetParts(UriComponents.SchemeAndServer, UriFormat.SafeUnescaped) + "/"; AuthenticationManager.SpnDictionary.InternalSet(spnKey, spn); } return ChallengedSpn = spn; } // internal void PreAuthIfNeeded(HttpWebRequest httpWebRequest, ICredentials authInfo) { // // attempt to do preauth, if needed // GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::PreAuthIfNeeded() TriedPreAuth:" + TriedPreAuth.ToString() + " authInfo:" + ValidationHelper.HashString(authInfo)); if (!TriedPreAuth) { TriedPreAuth = true; if (authInfo!=null) { PrepareState(httpWebRequest); Authorization preauth = null; try { preauth = AuthenticationManager.PreAuthenticate(httpWebRequest, authInfo); GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::PreAuthIfNeeded() preauth:" + ValidationHelper.HashString(preauth)); if (preauth!=null && preauth.Message!=null) { GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::PreAuthIfNeeded() setting TriedPreAuth to Complete:" + preauth.Complete.ToString()); UniqueGroupId = preauth.ConnectionGroupId; httpWebRequest.Headers.Set(AuthorizationHeader, preauth.Message); } } catch (Exception exception) { GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::PreAuthIfNeeded() PreAuthenticate() returned exception:" + exception.Message); ClearSession(httpWebRequest); } catch { GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::PreAuthIfNeeded() PreAuthenticate() returned exception: Non-CLS Compliant Exception"); ClearSession(httpWebRequest); } } } } // // attempts to authenticate the request: // returns true only if it succesfully called into the AuthenticationManager // and got back a valid Authorization and succesfully set the appropriate auth headers // internal bool AttemptAuthenticate(HttpWebRequest httpWebRequest, ICredentials authInfo) { // // Check for previous authentication attempts or the presence of credentials // GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() httpWebRequest#" + ValidationHelper.HashString(httpWebRequest) + " AuthorizationHeader:" + AuthorizationHeader.ToString()); if (Authorization!=null && Authorization.Complete) { // // here the design gets "dirty". // if this is proxy auth, we might have been challenged by an external // server as well. in this case we will have to clear our previous proxy // auth state before we go any further. this will be broken if the handshake // requires more than one dropped connection (which NTLM is a border case for, // since it droppes the connection on the 1st challenge but not on the second) // GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() Authorization!=null Authorization.Complete:" + Authorization.Complete.ToString()); if (IsProxyAuth) { // // so, we got passed a 407 but now we got a 401, the proxy probably // dropped the connection on us so we need to reset our proxy handshake // Consider: this should have been taken care by Update() // GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() ProxyAuth cleaning up auth status"); ClearAuthReq(httpWebRequest); } return false; } if (authInfo==null) { GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() authInfo==null Authorization#" + ValidationHelper.HashString(Authorization)); return false; } string challenge = httpWebRequest.AuthHeader(AuthenticateHeader); if (challenge==null) { // // the server sent no challenge, but this might be the case // in which we're succeeding an authorization handshake to // a proxy while a handshake with the server is still in progress. // if the handshake with the proxy is complete and we actually have // a handshake with the server in progress we can send the authorization header for the server as well. // if (!IsProxyAuth && Authorization!=null && httpWebRequest.ProxyAuthenticationState.Authorization!=null) { httpWebRequest.Headers.Set(AuthorizationHeader, Authorization.Message); } GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() challenge==null Authorization#" + ValidationHelper.HashString(Authorization)); return false; } // // if the AuthenticationManager throws on Authenticate, // bubble up that Exception to the user // GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() challenge:" + challenge); PrepareState(httpWebRequest); try { Authorization = AuthenticationManager.Authenticate(challenge, httpWebRequest, authInfo); } catch (Exception exception) { Authorization = null; GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::PreAuthIfNeeded() PreAuthenticate() returned exception:" + exception.Message); ClearSession(httpWebRequest); throw; } catch { Authorization = null; GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::PreAuthIfNeeded() PreAuthenticate() returned exception: Non-CLS Compliant Exception"); ClearSession(httpWebRequest); throw; } if (Authorization==null) { GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() Authorization==null"); return false; } if (Authorization.Message==null) { GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() Authorization.Message==null"); Authorization = null; return false; } UniqueGroupId = Authorization.ConnectionGroupId; GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::AttemptAuthenticate() AuthorizationHeader:" + AuthorizationHeader + " blob: " + Authorization.Message.Length + "bytes Complete:" + Authorization.Complete.ToString()); try { // // a "bad" module could try sending bad characters in the HTTP headers. // catch the exception from WebHeaderCollection.CheckBadChars() // fail the auth process // and return the exception to the user as InnerException // httpWebRequest.Headers.Set(AuthorizationHeader, Authorization.Message); } catch { Authorization = null; ClearSession(httpWebRequest); throw; } return true; } internal void ClearAuthReq(HttpWebRequest httpWebRequest) { // // if we are authenticating and we're being redirected to // another authentication space then remove the current // authentication header // GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::ClearAuthReq() httpWebRequest#" + ValidationHelper.HashString(httpWebRequest) + " " + AuthorizationHeader.ToString() + ": " + ValidationHelper.ToString(httpWebRequest.Headers[AuthorizationHeader])); TriedPreAuth = false; Authorization = null; UniqueGroupId = null; httpWebRequest.Headers.Remove(AuthorizationHeader); } // // gives the IAuthenticationModule a chance to update its internal state. // do any necessary cleanup and update the Complete status of the associated Authorization. // internal void Update(HttpWebRequest httpWebRequest) { // // RAID#86753 // [....]: this is just a fix for redirection & kerberos. // we need to close the Context and call ISC() again with the final // blob returned from the server. to do this in general // we would probably need to change the IAuthenticationMdule interface and // add this Update() method. for now we just have it internally. // // actually this turns out to be quite handy for 2 more cases: // NTLM auth: we need to clear the connection group after we suceed to prevent leakage. // Digest auth: we need to support stale credentials, if we fail with a 401 and stale is true we need to retry. // GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::Update() httpWebRequest#" + ValidationHelper.HashString(httpWebRequest) + " Authorization#" + ValidationHelper.HashString(Authorization) + " ResponseStatusCode:" + httpWebRequest.ResponseStatusCode.ToString()); if (Authorization!=null) { PrepareState(httpWebRequest); ISessionAuthenticationModule myModule = Module as ISessionAuthenticationModule; if (myModule!=null) { // // the whole point here is to complete the Security Context. Sometimes, though, // a bad cgi script or a bad server, could miss sending back the final blob. // in this case we won't be able to complete the handshake, but we'll have to clean up anyway. // string challenge = httpWebRequest.AuthHeader(AuthenticateHeader); GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::Update() Complete:" + Authorization.Complete.ToString() + " Module:" + ValidationHelper.ToString(Module) + " challenge:" + ValidationHelper.ToString(challenge)); if (!IsProxyAuth && httpWebRequest.ResponseStatusCode==HttpStatusCode.ProxyAuthenticationRequired) { // // don't call Update on the module, since there's an ongoing // handshake and we don't need to update any state in such a case // GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::Update() skipping call to " + myModule.ToString() + ".Update() since we need to reauthenticate with the proxy"); } else { bool complete = true; try { complete = myModule.Update(challenge, httpWebRequest); GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::Update() " + myModule.ToString() + ".Update() returned complete:" + complete.ToString()); } catch (Exception exception) { GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::Update() " + myModule.ToString() + ".Update() caught exception:" + exception.Message); ClearSession(httpWebRequest); #if !FEATURE_PAL if ((httpWebRequest.AuthenticationLevel == AuthenticationLevel.MutualAuthRequired) && (httpWebRequest.CurrentAuthenticationState == null || httpWebRequest.CurrentAuthenticationState.Authorization == null || !httpWebRequest.CurrentAuthenticationState.Authorization.MutuallyAuthenticated)) { throw; } #endif // !FEATURE_PAL } catch { GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::Update() " + myModule.ToString() + ".Update() caught exception: Non-CLS Compliant Exception"); ClearSession(httpWebRequest); #if !FEATURE_PAL if ((httpWebRequest.AuthenticationLevel == AuthenticationLevel.MutualAuthRequired) && (httpWebRequest.CurrentAuthenticationState == null || httpWebRequest.CurrentAuthenticationState.Authorization == null || !httpWebRequest.CurrentAuthenticationState.Authorization.MutuallyAuthenticated)) { throw; } #endif // !FEATURE_PAL } Authorization.SetComplete(complete); } } // // If authentication was successful, create binding between // the request and the authorization for future preauthentication // if (Module != null && Authorization.Complete && Module.CanPreAuthenticate && httpWebRequest.ResponseStatusCode!=StatusCodeMatch) { GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::Update() handshake is Complete calling BindModule()"); AuthenticationManager.BindModule(ChallengedUri, Authorization, Module); } } } internal void ClearSession() { #if !FEATURE_PAL // Security GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::ClearSession() NTAuthentication#" + ValidationHelper.HashString(SecurityContext)); if (SecurityContext!=null) { SecurityContext.CloseContext(); SecurityContext = null; } #endif // FEATURE_PAL // Security } internal void ClearSession(HttpWebRequest httpWebRequest) { PrepareState(httpWebRequest); ISessionAuthenticationModule myModule = Module as ISessionAuthenticationModule; Module = null; if (myModule!=null) { try { myModule.ClearSession(httpWebRequest); } catch (Exception exception) { if (NclUtilities.IsFatal(exception)) throw; GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::ClearSession() " + myModule.ToString() + ".Update() caught exception:" + exception.Message); } catch { GlobalLog.Print("AuthenticationState#" + ValidationHelper.HashString(this) + "::ClearSession() " + myModule.ToString() + ".Update() caught exception: Non-CLS Compliant Exception"); } } } } }Used by HttpWebRequest to syncronize and orchestrate authentication ///
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