From 6b2dcaef962abb2f5603aa46a53fd545615e1b76 Mon Sep 17 00:00:00 2001
From: Bill Zissimopoulos <billziss@navimatics.com>
Date: Wed, 19 Jul 2017 16:05:49 -0700
Subject: [PATCH] fsptool: getuid, getgid

---
 src/fsptool/fsptool.c | 146 ++++++++++++++++++++++++++++++++++++++----
 1 file changed, 134 insertions(+), 12 deletions(-)

diff --git a/src/fsptool/fsptool.c b/src/fsptool/fsptool.c
index d30863d9..0b088669 100644
--- a/src/fsptool/fsptool.c
+++ b/src/fsptool/fsptool.c
@@ -58,7 +58,6 @@ static void usage(void)
         "    lsvol       list file system devices (volumes)\n"
         //"    list        list running file system processes\n"
         //"    kill        kill file system process\n"
-        "    getsid      get current SID\n"
         "    getuid      get current POSIX UID\n"
         "    getgid      get current POSIX GID\n"
         "    uidtosid    get SID from POSIX UID\n"
@@ -129,6 +128,102 @@ static WCHAR FspToolGetDriveLetter(PDWORD PLogicalDrives, PWSTR VolumeName)
     return 0;
 }
 
+NTSTATUS FspToolGetUid(HANDLE Token, PUINT32 PUid)
+{
+    UINT32 Uid;
+    union
+    {
+        TOKEN_USER V;
+        UINT8 B[128];
+    } UserInfoBuf;
+    PTOKEN_USER UserInfo = &UserInfoBuf.V;
+    DWORD Size;
+    NTSTATUS Result;
+
+    if (!GetTokenInformation(Token, TokenUser, UserInfo, sizeof UserInfoBuf, &Size))
+    {
+        if (ERROR_INSUFFICIENT_BUFFER != GetLastError())
+        {
+            Result = FspNtStatusFromWin32(GetLastError());
+            goto exit;
+        }
+
+        UserInfo = MemAlloc(Size);
+        if (0 == UserInfo)
+        {
+            Result = STATUS_INSUFFICIENT_RESOURCES;
+            goto exit;
+        }
+
+        if (!GetTokenInformation(Token, TokenUser, UserInfo, Size, &Size))
+        {
+            Result = FspNtStatusFromWin32(GetLastError());
+            goto exit;
+        }
+    }
+
+    Result = FspPosixMapSidToUid(UserInfo->User.Sid, &Uid);
+    if (!NT_SUCCESS(Result))
+        goto exit;
+
+    *PUid = Uid;
+    Result = STATUS_SUCCESS;
+
+exit:
+    if (UserInfo != &UserInfoBuf.V)
+        MemFree(UserInfo);
+
+    return Result;
+}
+
+NTSTATUS FspToolGetGid(HANDLE Token, PUINT32 PGid)
+{
+    UINT32 Gid;
+    union
+    {
+        TOKEN_PRIMARY_GROUP V;
+        UINT8 B[128];
+    } GroupInfoBuf;
+    PTOKEN_PRIMARY_GROUP GroupInfo = &GroupInfoBuf.V;
+    DWORD Size;
+    NTSTATUS Result;
+
+    if (!GetTokenInformation(Token, TokenPrimaryGroup, GroupInfo, sizeof GroupInfoBuf, &Size))
+    {
+        if (ERROR_INSUFFICIENT_BUFFER != GetLastError())
+        {
+            Result = FspNtStatusFromWin32(GetLastError());
+            goto exit;
+        }
+
+        GroupInfo = MemAlloc(Size);
+        if (0 == GroupInfo)
+        {
+            Result = STATUS_INSUFFICIENT_RESOURCES;
+            goto exit;
+        }
+
+        if (!GetTokenInformation(Token, TokenPrimaryGroup, GroupInfo, Size, &Size))
+        {
+            Result = FspNtStatusFromWin32(GetLastError());
+            goto exit;
+        }
+    }
+
+    Result = FspPosixMapSidToUid(GroupInfo->PrimaryGroup, &Gid);
+    if (!NT_SUCCESS(Result))
+        goto exit;
+
+    *PGid = Gid;
+    Result = STATUS_SUCCESS;
+
+exit:
+    if (GroupInfo != &GroupInfoBuf.V)
+        MemFree(GroupInfo);
+
+    return Result;
+}
+
 static NTSTATUS lsvol_dev(PWSTR DeviceName)
 {
     NTSTATUS Result;
@@ -147,7 +242,6 @@ static NTSTATUS lsvol_dev(PWSTR DeviceName)
         if (L'\0' == *P)
         {
             Drive[0] = FspToolGetDriveLetter(&LogicalDrives, VolumeName);
-
             info("%-4S%S", Drive[0] ? Drive : L"", VolumeName);
             VolumeName = P + 1;
         }
@@ -175,19 +269,50 @@ static int lsvol(int argc, wchar_t **argv)
     return 0;
 }
 
-static int getsid(int argc, wchar_t **argv)
-{
-    return 1;
-}
-
 static int getuid(int argc, wchar_t **argv)
 {
-    return 1;
+    if (1 != argc)
+        usage();
+
+    HANDLE Token;
+    UINT32 Uid;
+    NTSTATUS Result;
+
+    if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &Token))
+        return GetLastError();
+
+    Result = FspToolGetUid(Token, &Uid);
+    if (!NT_SUCCESS(Result))
+        return FspWin32FromNtStatus(Result);
+
+    CloseHandle(Token);
+
+    info("%u", Uid);
+
+    return 0;
 }
 
 static int getgid(int argc, wchar_t **argv)
 {
-    return 1;
+    if (1 != argc)
+        usage();
+
+    HANDLE Token;
+    UINT32 Gid;
+    NTSTATUS Result;
+
+    if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &Token))
+        return GetLastError();
+
+    Result = FspToolGetGid(Token, &Gid);
+    if (!NT_SUCCESS(Result))
+        return FspWin32FromNtStatus(Result);
+
+    CloseHandle(Token);
+
+    info("%u", Gid);
+
+    return 0;
 }
 
 static int uidtosid(int argc, wchar_t **argv)
@@ -221,9 +346,6 @@ int wmain(int argc, wchar_t **argv)
     if (0 == invariant_wcscmp(L"lsvol", argv[0]))
         return lsvol(argc, argv);
     else
-    if (0 == invariant_wcscmp(L"getsid", argv[0]))
-        return getsid(argc, argv);
-    else
     if (0 == invariant_wcscmp(L"getuid", argv[0]))
         return getuid(argc, argv);
     else