1 files changed, 704 insertions, 0 deletions

diff --git a/src/ca/snisslcert.cpp b/src/ca/snisslcert.cpp
new file mode 100644
index 00000000..466ef0b9
--- /dev/null
+++ b/src/ca/snisslcert.cpp
@@ -0,0 +1,704 @@
+// 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.
+
+#include "precomp.h"
+
+#if _WIN32_WINNT < 0x0602
+
+typedef struct _HTTP_SERVICE_CONFIG_SSL_SNI_KEY
+{
+    SOCKADDR_STORAGE IpPort;
+    PWSTR Host;
+} HTTP_SERVICE_CONFIG_SSL_SNI_KEY, * PHTTP_SERVICE_CONFIG_SSL_SNI_KEY;
+
+typedef struct _HTTP_SERVICE_CONFIG_SSL_SNI_SET
+{
+    HTTP_SERVICE_CONFIG_SSL_SNI_KEY KeyDesc;
+    HTTP_SERVICE_CONFIG_SSL_PARAM   ParamDesc;
+} HTTP_SERVICE_CONFIG_SSL_SNI_SET, * PHTTP_SERVICE_CONFIG_SSL_SNI_SET;
+
+typedef struct _HTTP_SERVICE_CONFIG_SSL_SNI_QUERY
+{
+    HTTP_SERVICE_CONFIG_QUERY_TYPE  QueryDesc;
+    HTTP_SERVICE_CONFIG_SSL_SNI_KEY KeyDesc;
+    DWORD                           dwToken;
+} HTTP_SERVICE_CONFIG_SSL_SNI_QUERY, * PHTTP_SERVICE_CONFIG_SSL_SNI_QUERY;
+
+#define HttpServiceConfigSslSniCertInfo static_cast<HTTP_SERVICE_CONFIG_ID>(HttpServiceConfigCache + 1)
+
+#endif
+
+static UINT SchedHttpSniSslCerts(
+    __in WCA_TODO todoSched
+);
+static HRESULT WriteExistingSniSslCert(
+    __in WCA_TODO action,
+    __in_z LPCWSTR wzId,
+    __in_z LPCWSTR wzHost,
+    __in int iPort,
+    __in int iHandleExisting,
+    __in HTTP_SERVICE_CONFIG_SSL_SNI_SET* pSniSslSet,
+    __inout_z LPWSTR* psczCustomActionData
+);
+static HRESULT WriteSniSslCert(
+    __in WCA_TODO action,
+    __in_z LPCWSTR wzId,
+    __in_z LPCWSTR wzHost,
+    __in int iPort,
+    __in int iHandleExisting,
+    __in_z LPCWSTR wzCertificateThumbprint,
+    __in_z LPCWSTR wzAppId,
+    __in_z_opt LPCWSTR wzCertificateStore,
+    __inout_z LPWSTR* psczCustomActionData
+);
+static HRESULT EnsureAppId(
+    __inout_z LPWSTR* psczAppId,
+    __in_opt HTTP_SERVICE_CONFIG_SSL_SNI_SET* pExistingSniSslSet
+);
+static HRESULT StringFromGuid(
+    __in REFGUID rguid,
+    __inout_z LPWSTR* psczGuid
+);
+static HRESULT AddSniSslCert(
+    __in_z LPCWSTR wzId,
+    __in_z LPWSTR wzHost,
+    __in int iPort,
+    __in BYTE rgbCertificateThumbprint[],
+    __in DWORD cbCertificateThumbprint,
+    __in GUID* pAppId,
+    __in_z LPWSTR wzSslCertStore
+);
+static HRESULT GetSniSslCert(
+    __in_z LPWSTR wzHost,
+    __in int nPort,
+    __out HTTP_SERVICE_CONFIG_SSL_SNI_SET** ppSet
+);
+static HRESULT RemoveSniSslCert(
+    __in_z LPCWSTR wzId,
+    __in_z LPWSTR wzHost,
+    __in int iPort
+);
+static void SetSniSslCertSetKey(
+    __in HTTP_SERVICE_CONFIG_SSL_SNI_KEY* pKey,
+    __in_z LPWSTR wzHost,
+    __in int iPort
+);
+
+
+LPCWSTR vcsWixHttpSniSslCertQuery =
+L"SELECT `WixHttpSniSslCert`.`WixHttpSniSslCert`, `WixHttpSniSslCert`.`Host`, `WixHttpSniSslCert`.`Port`, `WixHttpSniSslCert`.`Thumbprint`, `WixHttpSniSslCert`.`AppId`, `WixHttpSniSslCert`.`Store`, `WixHttpSniSslCert`.`HandleExisting`, `WixHttpSniSslCert`.`Component_` "
+L"FROM `WixHttpSniSslCert`";
+enum eWixHttpSniSslCertQuery { hurqId = 1, hurqHost, hurqPort, hurqCertificateThumbprint, hurqAppId, hurqCertificateStore, hurqHandleExisting, hurqComponent };
+
+/******************************************************************
+ SchedWixHttpSniSslCertsInstall - immediate custom action entry
+   point to prepare adding URL reservations.
+
+********************************************************************/
+extern "C" UINT __stdcall SchedHttpSniSslCertsInstall(
+    __in MSIHANDLE hInstall
+)
+{
+    HRESULT hr = S_OK;
+
+    hr = WcaInitialize(hInstall, "SchedHttpSniSslCertsInstall");
+    ExitOnFailure(hr, "Failed to initialize");
+
+    hr = SchedHttpSniSslCerts(WCA_TODO_INSTALL);
+
+LExit:
+    return WcaFinalize(FAILED(hr) ? ERROR_INSTALL_FAILURE : ERROR_SUCCESS);
+}
+
+/******************************************************************
+ SchedWixHttpSniSslCertsUninstall - immediate custom action entry
+   point to prepare removing URL reservations.
+
+********************************************************************/
+extern "C" UINT __stdcall SchedHttpSniSslCertsUninstall(
+    __in MSIHANDLE hInstall
+)
+{
+    HRESULT hr = S_OK;
+
+    hr = WcaInitialize(hInstall, "SchedHttpSniSslCertsUninstall");
+    ExitOnFailure(hr, "Failed to initialize");
+
+    hr = SchedHttpSniSslCerts(WCA_TODO_UNINSTALL);
+
+LExit:
+    return WcaFinalize(FAILED(hr) ? ERROR_INSTALL_FAILURE : ERROR_SUCCESS);
+}
+
+/******************************************************************
+ ExecHttpSniSslCerts - deferred custom action entry point to
+   register and remove URL reservations.
+
+********************************************************************/
+extern "C" UINT __stdcall ExecHttpSniSslCerts(
+    __in MSIHANDLE hInstall
+)
+{
+    HRESULT hr = S_OK;
+    BOOL fHttpInitialized = FALSE;
+    LPWSTR sczCustomActionData = NULL;
+    LPWSTR wz = NULL;
+    int iTodo = WCA_TODO_UNKNOWN;
+    LPWSTR sczId = NULL;
+    LPWSTR sczHost = NULL;
+    int iPort = 0;
+    eHandleExisting handleExisting = heIgnore;
+    LPWSTR sczCertificateThumbprint = NULL;
+    LPWSTR sczAppId = NULL;
+    LPWSTR sczCertificateStore = NULL;
+
+    BOOL fRollback = ::MsiGetMode(hInstall, MSIRUNMODE_ROLLBACK);
+    BOOL fRemove = FALSE;
+    BOOL fAdd = FALSE;
+    BOOL fFailOnExisting = FALSE;
+
+    GUID guidAppId = { };
+    BYTE* pbCertificateThumbprint = NULL;
+    DWORD cbCertificateThumbprint = 0;
+
+    // Initialize.
+    hr = WcaInitialize(hInstall, "ExecHttpSniSslCerts");
+    ExitOnFailure(hr, "Failed to initialize");
+
+    hr = HRESULT_FROM_WIN32(::HttpInitialize(HTTPAPI_VERSION_1, HTTP_INITIALIZE_CONFIG, NULL));
+    ExitOnFailure(hr, "Failed to initialize HTTP Server configuration");
+
+    fHttpInitialized = TRUE;
+
+    hr = WcaGetProperty(L"CustomActionData", &sczCustomActionData);
+    ExitOnFailure(hr, "Failed to get CustomActionData");
+    WcaLog(LOGMSG_TRACEONLY, "CustomActionData: %ls", sczCustomActionData);
+
+    wz = sczCustomActionData;
+    while (wz && *wz)
+    {
+        // Extract the custom action data and if rolling back, swap INSTALL and UNINSTALL.
+        hr = WcaReadIntegerFromCaData(&wz, &iTodo);
+        ExitOnFailure(hr, "Failed to read todo from custom action data");
+
+        hr = WcaReadStringFromCaData(&wz, &sczId);
+        ExitOnFailure(hr, "Failed to read Id from custom action data");
+
+        hr = WcaReadStringFromCaData(&wz, &sczHost);
+        ExitOnFailure(hr, "Failed to read Host from custom action data");
+
+        hr = WcaReadIntegerFromCaData(&wz, &iPort);
+        ExitOnFailure(hr, "Failed to read Port from custom action data");
+
+        hr = WcaReadIntegerFromCaData(&wz, reinterpret_cast<int*>(&handleExisting));
+        ExitOnFailure(hr, "Failed to read HandleExisting from custom action data");
+
+        hr = WcaReadStringFromCaData(&wz, &sczCertificateThumbprint);
+        ExitOnFailure(hr, "Failed to read CertificateThumbprint from custom action data");
+
+        hr = WcaReadStringFromCaData(&wz, &sczAppId);
+        ExitOnFailure(hr, "Failed to read AppId from custom action data");
+
+        hr = WcaReadStringFromCaData(&wz, &sczCertificateStore);
+        ExitOnFailure(hr, "Failed to read CertificateStore from custom action data");
+
+        switch (iTodo)
+        {
+        case WCA_TODO_INSTALL:
+        case WCA_TODO_REINSTALL:
+            fRemove = heReplace == handleExisting || fRollback;
+            fAdd = !fRollback || *sczCertificateThumbprint;
+            fFailOnExisting = heFail == handleExisting && !fRollback;
+            break;
+
+        case WCA_TODO_UNINSTALL:
+            fRemove = !fRollback;
+            fAdd = fRollback && *sczCertificateThumbprint;
+            fFailOnExisting = FALSE;
+            break;
+        }
+
+        if (fRemove)
+        {
+            hr = RemoveSniSslCert(sczId, sczHost, iPort);
+            if (S_OK == hr)
+            {
+                WcaLog(LOGMSG_STANDARD, "Removed SNI SSL certificate '%ls' for hostname: %ls:%d", sczId, sczHost, iPort);
+            }
+            else if (FAILED(hr))
+            {
+                if (fRollback)
+                {
+                    WcaLogError(hr, "Failed to remove SNI SSL certificate to rollback '%ls' for hostname: %ls:%d", sczId, sczHost, iPort);
+                }
+                else
+                {
+                    ExitOnFailure(hr, "Failed to remove SNI SSL certificate '%ls' for hostname: %ls:%d", sczId, sczHost, iPort);
+                }
+            }
+        }
+
+        if (fAdd)
+        {
+            WcaLog(LOGMSG_STANDARD, "Adding SNI SSL certificate '%ls' for hostname: %ls:%d", sczId, sczHost, iPort);
+
+            hr = StrAllocHexDecode(sczCertificateThumbprint, &pbCertificateThumbprint, &cbCertificateThumbprint);
+            ExitOnFailure(hr, "Failed to convert thumbprint to bytes for SNI SSL certificate '%ls' for hostname: %ls:%d", sczId, sczHost, iPort);
+
+            hr = ::IIDFromString(sczAppId, &guidAppId);
+            ExitOnFailure(hr, "Failed to convert AppId '%ls' back to GUID for SNI SSL certificate '%ls' for hostname: %ls:%d", sczAppId, sczId, sczHost, iPort);
+
+            hr = AddSniSslCert(sczId, sczHost, iPort, pbCertificateThumbprint, cbCertificateThumbprint, &guidAppId, sczCertificateStore && *sczCertificateStore ? sczCertificateStore : L"MY");
+            if (S_FALSE == hr && fFailOnExisting)
+            {
+                hr = HRESULT_FROM_WIN32(ERROR_ALREADY_EXISTS);
+            }
+
+            if (S_OK == hr)
+            {
+                WcaLog(LOGMSG_STANDARD, "Added SNI SSL certificate '%ls' for hostname: %ls:%d with thumbprint: %ls", sczId, sczHost, iPort, sczCertificateThumbprint);
+            }
+            else if (FAILED(hr))
+            {
+                if (fRollback)
+                {
+                    WcaLogError(hr, "Failed to add SNI SSL certificate to rollback '%ls' for hostname: %ls:%d", sczId, sczHost, iPort);
+                }
+                else
+                {
+                    ExitOnFailure(hr, "Failed to add SNI SSL certificate '%ls' for hostname: %ls:%d", sczId, sczHost, iPort);
+                }
+            }
+
+            ReleaseNullMem(pbCertificateThumbprint);
+        }
+    }
+
+LExit:
+    ReleaseMem(pbCertificateThumbprint);
+    ReleaseStr(sczCertificateStore);
+    ReleaseStr(sczAppId);
+    ReleaseStr(sczCertificateThumbprint);
+    ReleaseStr(sczHost);
+    ReleaseStr(sczId);
+    ReleaseStr(sczCustomActionData);
+
+    if (fHttpInitialized)
+    {
+        ::HttpTerminate(HTTP_INITIALIZE_CONFIG, NULL);
+    }
+
+    return WcaFinalize(FAILED(hr) ? ERROR_INSTALL_FAILURE : ERROR_SUCCESS);
+}
+
+static UINT SchedHttpSniSslCerts(
+    __in WCA_TODO todoSched
+)
+{
+    HRESULT hr = S_OK;
+    UINT er = ERROR_SUCCESS;
+    BOOL fHttpInitialized = FALSE;
+    DWORD cCertificates = 0;
+
+    PMSIHANDLE hView = NULL;
+    PMSIHANDLE hRec = NULL;
+    PMSIHANDLE hQueryReq = NULL;
+    PMSIHANDLE hAceView = NULL;
+
+    LPWSTR sczCustomActionData = NULL;
+    LPWSTR sczRollbackCustomActionData = NULL;
+
+    LPWSTR sczId = NULL;
+    LPWSTR sczComponent = NULL;
+    WCA_TODO todoComponent = WCA_TODO_UNKNOWN;
+    LPWSTR sczHost = NULL;
+    int iPort = 0;
+    LPWSTR sczCertificateThumbprint = NULL;
+    LPWSTR sczAppId = NULL;
+    LPWSTR sczCertificateStore = NULL;
+    int iHandleExisting = 0;
+
+    HTTP_SERVICE_CONFIG_SSL_SNI_SET* pExistingSniSslSet = NULL;
+
+    // Anything to do?
+    hr = WcaTableExists(L"WixHttpSniSslCert");
+    ExitOnFailure(hr, "Failed to check if the WixHttpSniSslCert table exists");
+    if (S_FALSE == hr)
+    {
+        WcaLog(LOGMSG_STANDARD, "WixHttpSniSslCert table doesn't exist, so there are no URL reservations to configure");
+        ExitFunction();
+    }
+
+    // Query and loop through all the SNI SSL certificates.
+    hr = WcaOpenExecuteView(vcsWixHttpSniSslCertQuery, &hView);
+    ExitOnFailure(hr, "Failed to open view on the WixHttpSniSslCert table");
+
+    hr = HRESULT_FROM_WIN32(::HttpInitialize(HTTPAPI_VERSION_1, HTTP_INITIALIZE_CONFIG, NULL));
+    ExitOnFailure(hr, "Failed to initialize HTTP Server configuration");
+
+    fHttpInitialized = TRUE;
+
+    while (S_OK == (hr = WcaFetchRecord(hView, &hRec)))
+    {
+        hr = WcaGetRecordString(hRec, hurqId, &sczId);
+        ExitOnFailure(hr, "Failed to get WixHttpSniSslCert.WixHttpSniSslCert");
+
+        hr = WcaGetRecordString(hRec, hurqComponent, &sczComponent);
+        ExitOnFailure(hr, "Failed to get WixHttpSniSslCert.Component_");
+
+        // Figure out what we're doing for this reservation, treating reinstall the same as install.
+        todoComponent = WcaGetComponentToDo(sczComponent);
+        if ((WCA_TODO_REINSTALL == todoComponent ? WCA_TODO_INSTALL : todoComponent) != todoSched)
+        {
+            WcaLog(LOGMSG_STANDARD, "Component '%ls' action state (%d) doesn't match request (%d) for WixHttpSniSslCert '%ls'", sczComponent, todoComponent, todoSched, sczId);
+            continue;
+        }
+
+        hr = WcaGetRecordFormattedString(hRec, hurqHost, &sczHost);
+        ExitOnFailure(hr, "Failed to get WixHttpSniSslCert.Host");
+
+        hr = WcaGetRecordFormattedInteger(hRec, hurqPort, &iPort);
+        ExitOnFailure(hr, "Failed to get WixHttpSniSslCert.Port");
+
+        hr = WcaGetRecordFormattedString(hRec, hurqCertificateThumbprint, &sczCertificateThumbprint);
+        ExitOnFailure(hr, "Failed to get WixHttpSniSslCert.CertificateThumbprint");
+
+        if (!sczHost || !*sczHost)
+        {
+            hr = E_INVALIDARG;
+            ExitOnFailure(hr, "Require a Host value for WixHttpSniSslCert '%ls'", sczId);
+        }
+
+        if (!iPort)
+        {
+            hr = E_INVALIDARG;
+            ExitOnFailure(hr, "Require a Port value for WixHttpSniSslCert '%ls'", sczId);
+        }
+
+        if (!sczCertificateThumbprint || !*sczCertificateThumbprint)
+        {
+            hr = E_INVALIDARG;
+            ExitOnFailure(hr, "Require a CertificateThumbprint value for WixHttpSniSslCert '%ls'", sczId);
+        }
+
+        hr = WcaGetRecordFormattedString(hRec, hurqAppId, &sczAppId);
+        ExitOnFailure(hr, "Failed to get AppId for WixHttpSniSslCert '%ls'", sczId);
+
+        hr = WcaGetRecordFormattedString(hRec, hurqCertificateStore, &sczCertificateStore);
+        ExitOnFailure(hr, "Failed to get CertificateStore for WixHttpSniSslCert '%ls'", sczId);
+
+        hr = WcaGetRecordInteger(hRec, hurqHandleExisting, &iHandleExisting);
+        ExitOnFailure(hr, "Failed to get HandleExisting for WixHttpSniSslCert '%ls'", sczId);
+
+        hr = GetSniSslCert(sczHost, iPort, &pExistingSniSslSet);
+        ExitOnFailure(hr, "Failed to get the existing SNI SSL certificate for WixHttpSniSslCert '%ls'", sczId);
+
+        hr = EnsureAppId(&sczAppId, pExistingSniSslSet);
+        ExitOnFailure(hr, "Failed to ensure AppId for WixHttpSniSslCert '%ls'", sczId);
+
+        hr = WriteExistingSniSslCert(todoComponent, sczId, sczHost, iPort, iHandleExisting, pExistingSniSslSet, &sczRollbackCustomActionData);
+        ExitOnFailure(hr, "Failed to write rollback custom action data for WixHttpSniSslCert '%ls'", sczId);
+
+        hr = WriteSniSslCert(todoComponent, sczId, sczHost, iPort, iHandleExisting, sczCertificateThumbprint, sczAppId, sczCertificateStore, &sczCustomActionData);
+        ExitOnFailure(hr, "Failed to write custom action data for WixHttpSniSslCert '%ls'", sczId);
+        ++cCertificates;
+
+        ReleaseNullMem(pExistingSniSslSet);
+    }
+
+    // Reaching the end of the list is not an error.
+    if (E_NOMOREITEMS == hr)
+    {
+        hr = S_OK;
+    }
+    ExitOnFailure(hr, "Failure occurred while processing WixHttpSniSslCert table");
+
+    // Schedule ExecHttpSniSslCerts if there's anything to do.
+    if (cCertificates)
+    {
+        WcaLog(LOGMSG_STANDARD, "Scheduling SNI SSL certificate (%ls)", sczCustomActionData);
+        WcaLog(LOGMSG_STANDARD, "Scheduling rollback SNI SSL certificate (%ls)", sczRollbackCustomActionData);
+
+        if (WCA_TODO_INSTALL == todoSched)
+        {
+            hr = WcaDoDeferredAction(CUSTOM_ACTION_DECORATION(L"WixRollbackHttpSniSslCertsInstall"), sczRollbackCustomActionData, cCertificates * COST_HTTP_SNI_SSL);
+            ExitOnFailure(hr, "Failed to schedule install SNI SSL certificate rollback");
+            hr = WcaDoDeferredAction(CUSTOM_ACTION_DECORATION(L"WixExecHttpSniSslCertsInstall"), sczCustomActionData, cCertificates * COST_HTTP_SNI_SSL);
+            ExitOnFailure(hr, "Failed to schedule install SNI SSL certificate execution");
+        }
+        else
+        {
+            hr = WcaDoDeferredAction(CUSTOM_ACTION_DECORATION(L"WixRollbackHttpSniSslCertsUninstall"), sczRollbackCustomActionData, cCertificates * COST_HTTP_SNI_SSL);
+            ExitOnFailure(hr, "Failed to schedule uninstall SNI SSL certificate rollback");
+            hr = WcaDoDeferredAction(CUSTOM_ACTION_DECORATION(L"WixExecHttpSniSslCertsUninstall"), sczCustomActionData, cCertificates * COST_HTTP_SNI_SSL);
+            ExitOnFailure(hr, "Failed to schedule uninstall SNI SSL certificate execution");
+        }
+    }
+    else
+    {
+        WcaLog(LOGMSG_STANDARD, "No SNI SSL certificates scheduled");
+    }
+
+LExit:
+    ReleaseMem(pExistingSniSslSet);
+    ReleaseStr(sczCertificateStore);
+    ReleaseStr(sczAppId);
+    ReleaseStr(sczCertificateThumbprint);
+    ReleaseStr(sczHost);
+    ReleaseStr(sczComponent);
+    ReleaseStr(sczId);
+    ReleaseStr(sczRollbackCustomActionData);
+    ReleaseStr(sczCustomActionData);
+
+    if (fHttpInitialized)
+    {
+        ::HttpTerminate(HTTP_INITIALIZE_CONFIG, NULL);
+    }
+
+    return WcaFinalize(er = FAILED(hr) ? ERROR_INSTALL_FAILURE : er);
+}
+
+static HRESULT WriteExistingSniSslCert(
+    __in WCA_TODO action,
+    __in_z LPCWSTR wzId,
+    __in_z LPCWSTR wzHost,
+    __in int iPort,
+    __in int iHandleExisting,
+    __in HTTP_SERVICE_CONFIG_SSL_SNI_SET* pSniSslSet,
+    __inout_z LPWSTR* psczCustomActionData
+)
+{
+    HRESULT hr = S_OK;
+    LPWSTR sczCertificateThumbprint = NULL;
+    LPWSTR sczAppId = NULL;
+    LPCWSTR wzCertificateStore = NULL;
+
+    if (pSniSslSet)
+    {
+        hr = StrAllocHexEncode(reinterpret_cast<BYTE*>(pSniSslSet->ParamDesc.pSslHash), pSniSslSet->ParamDesc.SslHashLength, &sczCertificateThumbprint);
+        ExitOnFailure(hr, "Failed to convert existing certificate thumbprint to hex for WixHttpSniSslCert '%ls'", wzId);
+
+        hr = StringFromGuid(pSniSslSet->ParamDesc.AppId, &sczAppId);
+        ExitOnFailure(hr, "Failed to copy existing AppId for WixHttpSniSslCert '%ls'", wzId);
+
+        wzCertificateStore = pSniSslSet->ParamDesc.pSslCertStoreName;
+    }
+
+    hr = WriteSniSslCert(action, wzId, wzHost, iPort, iHandleExisting, sczCertificateThumbprint ? sczCertificateThumbprint : L"", sczAppId ? sczAppId : L"", wzCertificateStore ? wzCertificateStore : L"", psczCustomActionData);
+    ExitOnFailure(hr, "Failed to write custom action data for WixHttpSniSslCert '%ls'", wzId);
+
+LExit:
+    ReleaseStr(sczAppId);
+    ReleaseStr(sczCertificateThumbprint);
+
+    return hr;
+}
+
+static HRESULT WriteSniSslCert(
+    __in WCA_TODO action,
+    __in_z LPCWSTR wzId,
+    __in_z LPCWSTR wzHost,
+    __in int iPort,
+    __in int iHandleExisting,
+    __in_z LPCWSTR wzCertificateThumbprint,
+    __in_z LPCWSTR wzAppId,
+    __in_z_opt LPCWSTR wzCertificateStore,
+    __inout_z LPWSTR* psczCustomActionData
+)
+{
+    HRESULT hr = S_OK;
+
+    hr = WcaWriteIntegerToCaData(action, psczCustomActionData);
+    ExitOnFailure(hr, "Failed to write action to custom action data");
+
+    hr = WcaWriteStringToCaData(wzId, psczCustomActionData);
+    ExitOnFailure(hr, "Failed to write id to custom action data");
+
+    hr = WcaWriteStringToCaData(wzHost, psczCustomActionData);
+    ExitOnFailure(hr, "Failed to write Host to custom action data");
+
+    hr = WcaWriteIntegerToCaData(iPort, psczCustomActionData);
+    ExitOnFailure(hr, "Failed to write Port to custom action data");
+
+    hr = WcaWriteIntegerToCaData(iHandleExisting, psczCustomActionData);
+    ExitOnFailure(hr, "Failed to write HandleExisting to custom action data");
+
+    hr = WcaWriteStringToCaData(wzCertificateThumbprint, psczCustomActionData);
+    ExitOnFailure(hr, "Failed to write CertificateThumbprint to custom action data");
+
+    hr = WcaWriteStringToCaData(wzAppId, psczCustomActionData);
+    ExitOnFailure(hr, "Failed to write AppId to custom action data");
+
+    hr = WcaWriteStringToCaData(wzCertificateStore ? wzCertificateStore : L"", psczCustomActionData);
+    ExitOnFailure(hr, "Failed to write CertificateStore to custom action data");
+
+LExit:
+    return hr;
+}
+
+static HRESULT EnsureAppId(
+    __inout_z LPWSTR* psczAppId,
+    __in_opt HTTP_SERVICE_CONFIG_SSL_SNI_SET* pExistingSniSslSet
+)
+{
+    HRESULT hr = S_OK;
+    RPC_STATUS rs = RPC_S_OK;
+    GUID guid = { };
+
+    if (!psczAppId || !*psczAppId || !**psczAppId)
+    {
+        if (pExistingSniSslSet)
+        {
+            hr = StringFromGuid(pExistingSniSslSet->ParamDesc.AppId, psczAppId);
+            ExitOnFailure(hr, "Failed to ensure AppId guid");
+        }
+        else
+        {
+            rs = ::UuidCreate(&guid);
+            hr = HRESULT_FROM_RPC(rs);
+            ExitOnRootFailure(hr, "Failed to create guid for AppId");
+
+            hr = StringFromGuid(guid, psczAppId);
+            ExitOnFailure(hr, "Failed to ensure AppId guid");
+        }
+    }
+
+LExit:
+    return hr;
+}
+
+static HRESULT StringFromGuid(
+    __in REFGUID rguid,
+    __inout_z LPWSTR* psczGuid
+)
+{
+    HRESULT hr = S_OK;
+    WCHAR wzGuid[39];
+
+    if (!::StringFromGUID2(rguid, wzGuid, countof(wzGuid)))
+    {
+        hr = E_OUTOFMEMORY;
+        ExitOnRootFailure(hr, "Failed to convert guid into string");
+    }
+
+    hr = StrAllocString(psczGuid, wzGuid, 0);
+    ExitOnFailure(hr, "Failed to copy guid");
+
+LExit:
+    return hr;
+}
+
+static HRESULT AddSniSslCert(
+    __in_z LPCWSTR /*wzId*/,
+    __in_z LPWSTR wzHost,
+    __in int iPort,
+    __in BYTE rgbCertificateThumbprint[],
+    __in DWORD cbCertificateThumbprint,
+    __in GUID* pAppId,
+    __in_z LPWSTR wzSslCertStore
+)
+{
+    HRESULT hr = S_OK;
+    DWORD er = ERROR_SUCCESS;
+    HTTP_SERVICE_CONFIG_SSL_SNI_SET set = { };
+
+    SetSniSslCertSetKey(&set.KeyDesc, wzHost, iPort);
+    set.ParamDesc.SslHashLength = cbCertificateThumbprint;
+    set.ParamDesc.pSslHash = rgbCertificateThumbprint;
+    set.ParamDesc.AppId = *pAppId;
+    set.ParamDesc.pSslCertStoreName = wzSslCertStore;
+
+    er = ::HttpSetServiceConfiguration(NULL, HttpServiceConfigSslSniCertInfo, &set, sizeof(set), NULL);
+    if (ERROR_ALREADY_EXISTS == er)
+    {
+        hr = S_FALSE;
+    }
+    else
+    {
+        hr = HRESULT_FROM_WIN32(er);
+    }
+
+    return hr;
+}
+
+static HRESULT GetSniSslCert(
+    __in_z LPWSTR wzHost,
+    __in int nPort,
+    __out HTTP_SERVICE_CONFIG_SSL_SNI_SET** ppSet
+)
+{
+    HRESULT hr = S_OK;
+    DWORD er = ERROR_SUCCESS;
+    HTTP_SERVICE_CONFIG_SSL_SNI_QUERY query = { };
+    HTTP_SERVICE_CONFIG_SSL_SNI_SET* pSet = NULL;
+    ULONG cbSet = 0;
+
+    *ppSet = NULL;
+
+    query.QueryDesc = HttpServiceConfigQueryExact;
+    SetSniSslCertSetKey(&query.KeyDesc, wzHost, nPort);
+
+    er = ::HttpQueryServiceConfiguration(NULL, HttpServiceConfigSslSniCertInfo, &query, sizeof(query), pSet, cbSet, &cbSet, NULL);
+    if (ERROR_INSUFFICIENT_BUFFER == er)
+    {
+        pSet = reinterpret_cast<HTTP_SERVICE_CONFIG_SSL_SNI_SET*>(MemAlloc(cbSet, TRUE));
+        ExitOnNull(pSet, hr, E_OUTOFMEMORY, "Failed to allocate query SN SSL certificate buffer");
+
+        er = ::HttpQueryServiceConfiguration(NULL, HttpServiceConfigSslSniCertInfo, &query, sizeof(query), pSet, cbSet, &cbSet, NULL);
+    }
+
+    if (ERROR_SUCCESS == er)
+    {
+        *ppSet = pSet;
+        pSet = NULL;
+    }
+    else if (ERROR_FILE_NOT_FOUND == er)
+    {
+        hr = S_FALSE;
+    }
+    else
+    {
+        hr = HRESULT_FROM_WIN32(er);
+    }
+
+LExit:
+    ReleaseMem(pSet);
+
+    return hr;
+}
+
+static HRESULT RemoveSniSslCert(
+    __in_z LPCWSTR /*wzId*/,
+    __in_z LPWSTR wzHost,
+    __in int iPort
+)
+{
+    HRESULT hr = S_OK;
+    DWORD er = ERROR_SUCCESS;
+    HTTP_SERVICE_CONFIG_SSL_SNI_SET set = { };
+
+    SetSniSslCertSetKey(&set.KeyDesc, wzHost, iPort);
+
+    er = ::HttpDeleteServiceConfiguration(NULL, HttpServiceConfigSslSniCertInfo, &set, sizeof(set), NULL);
+    if (ERROR_FILE_NOT_FOUND == er)
+    {
+        hr = S_FALSE;
+    }
+    else
+    {
+        hr = HRESULT_FROM_WIN32(er);
+    }
+
+    return hr;
+}
+
+static void SetSniSslCertSetKey(
+    __in HTTP_SERVICE_CONFIG_SSL_SNI_KEY* pKey,
+    __in_z LPWSTR wzHost,
+    __in int iPort
+)
+{
+    pKey->Host = wzHost;
+    SOCKADDR_IN* pss = reinterpret_cast<SOCKADDR_IN*>(&pKey->IpPort);
+    pss->sin_family = AF_INET;
+    pss->sin_port = htons(static_cast<USHORT>(iPort));
+}