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Fix faulty memory access in Util's User custom actions
Generally, clean up the handling of getting the domain from a server name by centralizing and simplifying it behind an improved GetDomainFromServerName() based on the buggy GetServerName(). Fixes 8576
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,59 @@ | ||
| // Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. | ||
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| #include "precomp.h" | ||
|
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| HRESULT GetDomainFromServerName( | ||
| __deref_out_z LPWSTR* ppwzDomainName, | ||
| __in_z LPCWSTR wzServerName, | ||
| __in DWORD dwFlags | ||
| ) | ||
| { | ||
| HRESULT hr = S_OK; | ||
| DWORD er = ERROR_SUCCESS; | ||
| PDOMAIN_CONTROLLER_INFOW pDomainControllerInfo = NULL; | ||
| LPCWSTR wz = wzServerName ? wzServerName : L""; // initialize the domain to the provided server name (or empty string). | ||
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| // If the server name was not empty, try to get the domain name out of it. | ||
| if (*wz) | ||
| { | ||
| er = ::DsGetDcNameW(NULL, wz, NULL, NULL, dwFlags, &pDomainControllerInfo); | ||
| if (RPC_S_SERVER_UNAVAILABLE == er) | ||
| { | ||
| // MSDN says, if we get the above error code, try again with the "DS_FORCE_REDISCOVERY" flag. | ||
| er = ::DsGetDcNameW(NULL, wz, NULL, NULL, dwFlags | DS_FORCE_REDISCOVERY, &pDomainControllerInfo); | ||
| } | ||
| ExitOnWin32Error(er, hr, "Could not get domain name from server name: %ls", wz); | ||
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| if (pDomainControllerInfo->DomainControllerName) | ||
| { | ||
| // Skip the \\ prefix if present. | ||
| if ('\\' == *pDomainControllerInfo->DomainControllerName && '\\' == *(pDomainControllerInfo->DomainControllerName + 1)) | ||
| { | ||
| wz = pDomainControllerInfo->DomainControllerName + 2; | ||
| } | ||
| else | ||
| { | ||
| wz = pDomainControllerInfo->DomainControllerName; | ||
| } | ||
| } | ||
| } | ||
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| LExit: | ||
| // Note: we overwrite the error code here as failure to contact domain controller above is not a fatal error. | ||
| if (wz && *wz) | ||
| { | ||
| hr = StrAllocString(ppwzDomainName, wz, 0); | ||
| } | ||
| else // return NULL the server name ended up empty. | ||
| { | ||
| ReleaseNullStr(*ppwzDomainName); | ||
| hr = S_OK; | ||
| } | ||
|
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| if (pDomainControllerInfo) | ||
| { | ||
| ::NetApiBufferFree((LPVOID)pDomainControllerInfo); | ||
| } | ||
|
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||
| return hr; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| #pragma once | ||
| // Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. | ||
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| HRESULT GetDomainFromServerName( | ||
| __deref_out_z LPWSTR* ppwzDomainName, | ||
| __in_z LPCWSTR wzServerName, | ||
| __in DWORD dwFlags | ||
| ); |