advapi32: Implement GetSecurityInfo.

[Dan Hipschman]

The indenting is consistent with the rest of the file.

---
 dlls/advapi32/security.c |   35 +++++++++++++++++++++++++++++++++--
 1 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/dlls/advapi32/security.c b/dlls/advapi32/security.c
index 95b7a7b..8b661ce 100644
--- a/dlls/advapi32/security.c
+++ b/dlls/advapi32/security.c
@@ -19,6 +19,7 @@
  *
  */
 
+#include <assert.h>
 #include <stdarg.h>
 #include <string.h>
 
@@ -2718,8 +2719,38 @@ DWORD WINAPI GetSecurityInfo(
     PSECURITY_DESCRIPTOR *ppSecurityDescriptor
 )
 {
-  FIXME("stub!\n");
-  return ERROR_BAD_PROVIDER;
+    SECURITY_DESCRIPTOR *sd;
+    NTSTATUS status;
+    ULONG n1, n2;
+
+    status = NtQuerySecurityObject(hObject, SecurityInfo, NULL, 0, &n1);
+    assert(status != STATUS_SUCCESS);
+    if (status != STATUS_BUFFER_TOO_SMALL)
+        return RtlNtStatusToDosError(status);
+
+    sd = HeapAlloc(GetProcessHeap(), 0, n1);
+    if (!sd)
+        return ERROR_NOT_ENOUGH_MEMORY;
+
+    status = NtQuerySecurityObject(hObject, SecurityInfo, sd, n1, &n2);
+    if (status != STATUS_SUCCESS)
+    {
+        HeapFree(GetProcessHeap(), 0, sd);
+        return RtlNtStatusToDosError(status);
+    }
+
+    if (ppsidOwner)
+        *ppsidOwner = sd->Owner;
+    if (ppsidGroup)
+        *ppsidGroup = sd->Group;
+    if (ppDacl)
+        *ppDacl = sd->Dacl;
+    if (ppSacl)
+        *ppSacl = sd->Sacl;
+    if (ppSecurityDescriptor)
+        *ppSecurityDescriptor = sd;
+
+    return ERROR_SUCCESS;
 }
 
 /******************************************************************************