msi: Create the custom action server as an elevated process.

Dragon Naturally Speaking 12.5 manually validates that the custom action server is elevated. One might imagine that the right approach here is to add a manifest to msiexec; however, msiexec does not always trigger a UAC prompt on Windows. Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=51143

msi: Create the custom action server as an elevated process.
366398cc · Zebediah Figura · Alexandre Julliard · b381f9d0 · 366398cc
Commit 366398cc authored May 16, 2021 by Zebediah Figura Committed by Alexandre Julliard Mar 04, 2024
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Showing with 22 additions and 2 deletions

custom.c dlls/msi/custom.c +22 -2

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--- a/dlls/msi/custom.c
+++ b/dlls/msi/custom.c
@@ -573,12 +573,28 @@ UINT CDECL __wine_msi_call_dll_function(DWORD client_pid, const GUID *guid)
    return r;
 }

+static HANDLE get_admin_token(void)
+{
+    TOKEN_ELEVATION_TYPE type;
+    TOKEN_LINKED_TOKEN linked;
+    DWORD size;
+
+    if (!GetTokenInformation(GetCurrentThreadEffectiveToken(), TokenElevationType, &type, sizeof(type), &size)
+            || type == TokenElevationTypeFull)
+        return NULL;
+
+    if (!GetTokenInformation(GetCurrentThreadEffectiveToken(), TokenLinkedToken, &linked, sizeof(linked), &size))
+        return NULL;
+    return linked.LinkedToken;
+}
+
 static DWORD custom_start_server(MSIPACKAGE *package, DWORD arch)
 {
    WCHAR path[MAX_PATH], cmdline[MAX_PATH + 23];
    PROCESS_INFORMATION pi = {0};
    STARTUPINFOW si = {0};
    WCHAR buffer[24];
+    HANDLE token;
    void *cookie;
    HANDLE pipe;

@@ -600,14 +616,18 @@ static DWORD custom_start_server(MSIPACKAGE *package, DWORD arch)
    lstrcatW(path, L"\\msiexec.exe");
    swprintf(cmdline, ARRAY_SIZE(cmdline), L"%s -Embedding %d", path, GetCurrentProcessId());

+    token = get_admin_token();
+
    if (is_wow64 && arch == SCS_64BIT_BINARY)
    {
        Wow64DisableWow64FsRedirection(&cookie);
-        CreateProcessW(path, cmdline, NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi);
+        CreateProcessAsUserW(token, path, cmdline, NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi);
        Wow64RevertWow64FsRedirection(cookie);
    }
    else
-        CreateProcessW(path, cmdline, NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi);
+        CreateProcessAsUserW(token, path, cmdline, NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi);
+
+    if (token) CloseHandle(token);

    CloseHandle(pi.hThread);