Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / _KerberosClient.cs / 1 / _KerberosClient.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net { using System.Collections; using System.Net.Sockets; using System.Security.Permissions; using System.Globalization; internal class KerberosClient : ISessionAuthenticationModule { internal const string AuthType = "Kerberos"; internal static string Signature = AuthType.ToLower(CultureInfo.InvariantCulture); internal static int SignatureSize = Signature.Length; // we can't work on non-NT platforms, so we shut off with an exception // NOTE this exception IS caught internally. internal KerberosClient() { if (!ComNetOS.IsWin2K) { throw new PlatformNotSupportedException(SR.GetString(SR.Win2000Required)); } } public Authorization Authenticate(string challenge, WebRequest webRequest, ICredentials credentials) { GlobalLog.Print("KerberosClient::Authenticate() challenge:[" + ValidationHelper.ToString(challenge) + "] webRequest#" + ValidationHelper.HashString(webRequest) + " credentials#" + ValidationHelper.HashString(credentials) + " calling DoAuthenticate()"); return DoAuthenticate(challenge, webRequest, credentials, false); } private Authorization DoAuthenticate(string challenge, WebRequest webRequest, ICredentials credentials, bool preAuthenticate) { GlobalLog.Print("KerberosClient::DoAuthenticate() challenge:[" + ValidationHelper.ToString(challenge) + "] webRequest#" + ValidationHelper.HashString(webRequest) + " credentials#" + ValidationHelper.HashString(credentials) + " preAuthenticate:" + preAuthenticate.ToString()); GlobalLog.Assert(credentials != null, "KerberosClient::DoAuthenticate()|credentials == null"); if (credentials == null) { return null; } HttpWebRequest httpWebRequest = webRequest as HttpWebRequest; GlobalLog.Assert(httpWebRequest != null, "KerberosClient::DoAuthenticate()|httpWebRequest == null"); GlobalLog.Assert(httpWebRequest.ChallengedUri != null, "KerberosClient::DoAuthenticate()|httpWebRequest.ChallengedUri == null"); NTAuthentication authSession = null; string incoming = null; if (!preAuthenticate) { int index = AuthenticationManager.FindSubstringNotInQuotes(challenge, Signature); if (index < 0) { return null; } int blobBegin = index + SignatureSize; // // there may be multiple challenges. If the next character after the // package name is not a comma then it is challenge data // if (challenge.Length > blobBegin && challenge[blobBegin] != ',') { ++blobBegin; } else { index = -1; } if (index >= 0 && challenge.Length > blobBegin) { // Strip other modules information in case of multiple challenges // i.e do not take ", NTLM" as part of the following Negotiate blob // Negotiate TlRMTVNTUAACAAAADgAOADgAAAA1wo ... MAbwBmAHQALgBjAG8AbQAAAAAA,NTLM index = challenge.IndexOf(',', blobBegin); if (index != -1) incoming = challenge.Substring(blobBegin, index - blobBegin); else incoming = challenge.Substring(blobBegin); } authSession = httpWebRequest.CurrentAuthenticationState.GetSecurityContext(this); GlobalLog.Print("KerberosClient::DoAuthenticate() key:" + ValidationHelper.HashString(httpWebRequest.CurrentAuthenticationState) + " retrieved authSession:" + ValidationHelper.HashString(authSession)); } if (authSession==null) { NetworkCredential NC = credentials.GetCredential(httpWebRequest.ChallengedUri, Signature); GlobalLog.Print("KerberosClient::DoAuthenticate() GetCredential() returns:" + ValidationHelper.ToString(NC)); if (NC == null || (!(NC is SystemNetworkCredential) && NC.InternalGetUserName().Length == 0)) { return null; } ICredentialPolicy policy = AuthenticationManager.CredentialPolicy; if (policy != null && !policy.ShouldSendCredential(httpWebRequest.ChallengedUri, httpWebRequest, NC, this)) return null; string spn = httpWebRequest.CurrentAuthenticationState.GetComputeSpn(httpWebRequest); GlobalLog.Print("KerberosClient::Authenticate() ChallengedSpn:" + ValidationHelper.ToString(spn)); authSession = new NTAuthentication( AuthType, NC, spn, httpWebRequest); GlobalLog.Print("KerberosClient::DoAuthenticate() setting SecurityContext for:" + ValidationHelper.HashString(httpWebRequest.CurrentAuthenticationState) + " to authSession:" + ValidationHelper.HashString(authSession)); httpWebRequest.CurrentAuthenticationState.SetSecurityContext(authSession, this); } string clientResponse = authSession.GetOutgoingBlob(incoming); if (clientResponse==null) { return null; } return new Authorization(AuthType + " " + clientResponse, authSession.IsCompleted, string.Empty, authSession.IsMutualAuthFlag); } public bool CanPreAuthenticate { get { return true; } } public Authorization PreAuthenticate(WebRequest webRequest, ICredentials credentials) { GlobalLog.Print("KerberosClient::PreAuthenticate() webRequest#" + ValidationHelper.HashString(webRequest) + " credentials#" + ValidationHelper.HashString(credentials) + " calling DoAuthenticate()"); return DoAuthenticate(null, webRequest, credentials, true); } public string AuthenticationType { get { return AuthType; } } // // called when getting the final blob on the 200 OK from the server // public bool Update(string challenge, WebRequest webRequest) { GlobalLog.Print("KerberosClient::Update(): " + challenge); HttpWebRequest httpWebRequest = webRequest as HttpWebRequest; GlobalLog.Assert(httpWebRequest != null, "KerberosClient::Update()|httpWebRequest == null"); GlobalLog.Assert(httpWebRequest.ChallengedUri != null, "KerberosClient::Update()|httpWebRequest.ChallengedUri == null"); // // try to retrieve the state of the ongoing handshake // NTAuthentication authSession = httpWebRequest.CurrentAuthenticationState.GetSecurityContext(this); GlobalLog.Print("KerberosClient::Update() key:" + ValidationHelper.HashString(httpWebRequest.CurrentAuthenticationState) + " retrieved authSession:" + ValidationHelper.HashString(authSession)); if (authSession==null) { GlobalLog.Print("KerberosClient::Update() null session returning true"); return true; } GlobalLog.Print("KerberosClient::Update() authSession.IsCompleted:" + authSession.IsCompleted.ToString()); if (httpWebRequest.CurrentAuthenticationState.StatusCodeMatch==httpWebRequest.ResponseStatusCode) { GlobalLog.Print("KerberosClient::Update() still handshaking (based on status code) returning false"); return false; } // // the whole point here is to to close the Security Context (this will complete the authentication handshake // with server authentication for schemese that support it such as Kerberos) // int index = challenge==null ? -1 : AuthenticationManager.FindSubstringNotInQuotes(challenge, Signature); if (index>=0) { int blobBegin = index + SignatureSize; string incoming = null; // // there may be multiple challenges. If the next character after the // package name is not a comma then it is challenge data // if (challenge.Length > blobBegin && challenge[blobBegin] != ',') { ++blobBegin; } else { index = -1; } if (index >= 0 && challenge.Length > blobBegin) { incoming = challenge.Substring(blobBegin); } GlobalLog.Print("KerberosClient::Update() closing security context using last incoming blob:[" + ValidationHelper.ToString(incoming) + "]"); string clientResponse = authSession.GetOutgoingBlob(incoming); httpWebRequest.CurrentAuthenticationState.Authorization.MutuallyAuthenticated = authSession.IsMutualAuthFlag; GlobalLog.Print("KerberosClient::Update() GetOutgoingBlob() returns clientResponse:[" + ValidationHelper.ToString(clientResponse) + "] IsCompleted:" + authSession.IsCompleted.ToString()); } GlobalLog.Print("KerberosClient::Update() session removed and ConnectionGroup released returning true"); ClearSession(httpWebRequest); return true; } public void ClearSession(WebRequest webRequest) { HttpWebRequest httpWebRequest = webRequest as HttpWebRequest; GlobalLog.Assert(httpWebRequest != null, "KerberosClient::ClearSession()|httpWebRequest == null"); httpWebRequest.CurrentAuthenticationState.ClearSession(); } public bool CanUseDefaultCredentials { get { return true; } } }; // class KerberosClient } // namespace System.Net
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