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Using Impersonation
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Using impersonation is really quite simple Prior to doing something that requires a higher level of security, you simply establish a new identity, do the work necessary, and then release the identity A perfect example of this is accessing webs using the SPWeb object; the method AllWebs returns a collection of all sub sites in the site For example:
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using SystemSecurityPrincipal; // Needed for Impersonation using MicrosoftWin32; // Needed for access to the Registry using SystemDiagnostics; // Needed for Event Log //-----------------------------------------------------------------------// START IMPERSONATION BEFORE WE ATTEMPT TO GET THE WEBS:
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WindowsImpersonationContext GlobalWIC = StartImpersonation("Domain","Account","Password"); try { SPWebCollection TheWebCol = MySPWebAllWebs(); } catch (Exception ErrInAccess) { string ErrIs = ErrInAccessMessageToString(); if (ErrIsIndexOf("401") > -1) { ErrIs = "ERROR: Account Access Denied"; } } // Done - stop impersonation: EndImpersonation(GlobalWIC);
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//=========================================================================== /// StartImpersonation - Start impersonating //=========================================================================== // Note: keep this on one line (broken here for readability): private static WindowsImpersonationContext StartImpersonation(string ADomain, string AName, string APwd) { // START IMPERSONATION: // WindowsImpersonationContext WinImpContext = null; try { WinImpContext = CreateIdentity(AName, ADomain, APwd)Impersonate(); } catch { } // return WinImpContext; } //=========================================================================== /// EndImpersonation - End impersonating //=========================================================================== protected static void EndImpersonation(WindowsImpersonationContext WinImpContext) { try { WinImpContextUndo(); } catch { } } //=========================================================================== /// CreateIdentity Method (uses WriteEventLog routine!): //=========================================================================== /// <param name="User">User Account Name</param> /// <param name="Domain">Domain Name</param> /// <param name="Password">User Account Password</param> /// <returns>Windows Identity</returns> // Note: keep this on one line (broken here for readability): protected static WindowsIdentity
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CreateIdentity(string User, string Domain, string Password) { // // Set up a user token: // IntPtr tokenHandle = new IntPtr(0); // const int LOGON32_PROVIDER_DEFAULT = 0; const int LOGON32_LOGON_NETWORK = 3; // // Init the TokenHandle: // tokenHandle = IntPtrZero; // // Call LogonUser to obtain a handle to an access token: // bool returnValue = LogonUser(User, Domain, Password, LOGON32_LOGON_NETWORK, LOGON32_PROVIDER_DEFAULT, ref tokenHandle); // // Check the return status: // if (false == returnValue) { int ret = MarshalGetLastWin32Error(); WriteEventLog("MyProgram","Login Failure!","ERROR",1,"Services"); } // The WindowsIdentity class makes a new copy of the token - It also // handles calling CloseHandle for the copy: WindowsIdentity id = new WindowsIdentity(tokenHandle); CloseHandle(tokenHandle); // Return the ID: return id; } // // DLL References (these are Required): // [DllImport("advapi32dll", SetLastError = true)] private static extern bool LogonUser(string lpszUsername, string lpszDomain, string lpszPassword, int dwLogonType, int dwLogonProvider, ref SystemIntPtr phToken); [DllImport("kernel32dll", CharSet = CharSetAuto)] private extern static bool CloseHandle(SystemIntPtr handle);
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Retrieving Impersonation Account from Registry
Storing impersonation account information in the Registry is usually the most secure and it also provides a great mechanism for maintenance, because the password can be changed at any time with no impact on the code To begin with, this routine requires that there be actual entries in the Registry that it can find the key values in It looks something like this:
[HKEY_LOCAL_MACHINE\SOFTWARE\Sterling] [HKEY_LOCAL_MACHINE\SOFTWARE\Sterling\ImpersonateAcct] "AccountPwd"="M0SS123$" "DomainName"="MOSS" "AccountName"="MOSSAcct"
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Obviously, you would use something other than Sterling, ImpersonateAcct, and the account I specified (you ll see where these are used later in the chapter) You can manually create these entries (using RegEdit) or create a text file named reg using the previous text (altered, of course) Save the file, and then double-click it to automatically add it to the registry
C AUTION Accessing the system Registry can have disastrous results; make a backup and if unsure,
seek assistance first!
//=========================================================================== /// GetAccountInfoFromRegistry - Return account information from Registry //=========================================================================== protected bool GetAccountInfoFromRegistry(out string AccountName, out string AccountPwd, out string DomainName) { // Init return values: AccountName = ""; AccountPwd = ""; DomainName = ""; bool AcctInfoSet = true; try { // Get Impersonation account information from the Registry: string RtnStringValue = ""; GetAppRegistryKey("DomainName", "Sterling", "ImpersonationAcct", out RtnStringValue); if (RtnStringValueIndexOf("ERROR") != -1) { AcctInfoSet = false; } else { DomainName = RtnStringValueToString(); } // GetAppRegistryKey("AccountName", "Sterling", "ImpersonationAcct", out RtnStringValue); if (RtnStringValueIndexOf("ERROR") != -1) { AcctInfoSet = false; } else { AccountName = RtnStringValueToString(); } // GetAppRegistryKey("AccountPwd", "Sterling", "ImpersonationAcct", out RtnStringValue); if (RtnStringValueIndexOf("ERROR") != -1) { AcctInfoSet = false; } else { AccountPwd = RtnStringValueToString(); }
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