Add inheritable ACE when creating a restricted token for execution on

Win32.

Also refactor the code around it to be more clear.

Jesse Morris

src/bin/initdb/initdb.c

@@ -42,7 +42,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  * Portions taken from FreeBSD.
  *
- * $PostgreSQL: pgsql/src/bin/initdb/initdb.c,v 1.176 2009/11/12 02:46:16 tgl Exp $
+ * $PostgreSQL: pgsql/src/bin/initdb/initdb.c,v 1.177 2009/11/14 15:39:36 mha Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -2354,6 +2354,10 @@ CreateRestrictedProcess(char *cmd, PROCESS_INFORMATION *processInfo)
 		return 0;
 	}
 
+#ifndef __CYGWIN__
+    AddUserToTokenDacl(restrictedToken);
+#endif
+
 	if (!CreateProcessAsUser(restrictedToken,
 							 NULL,
 							 cmd,
@@ -2371,10 +2375,6 @@ CreateRestrictedProcess(char *cmd, PROCESS_INFORMATION *processInfo)
 		return 0;
 	}
 
-#ifndef __CYGWIN__
-	AddUserToDacl(processInfo->hProcess);
-#endif
-
 	return ResumeThread(processInfo->hThread);
 }
 #endif

src/bin/pg_ctl/pg_ctl.c

@@ -4,7 +4,7 @@
  *
  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
  *
- * $PostgreSQL: pgsql/src/bin/pg_ctl/pg_ctl.c,v 1.114 2009/09/07 11:22:12 mha Exp $
+ * $PostgreSQL: pgsql/src/bin/pg_ctl/pg_ctl.c,v 1.115 2009/11/14 15:39:36 mha Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1405,6 +1405,10 @@ CreateRestrictedProcess(char *cmd, PROCESS_INFORMATION *processInfo, bool as_ser
 		return 0;
 	}
 
+#ifndef __CYGWIN__
+	AddUserToTokenDacl(restrictedToken);
+#endif
+
 	r = CreateProcessAsUser(restrictedToken, NULL, cmd, NULL, NULL, TRUE, CREATE_SUSPENDED, NULL, NULL, &si, processInfo);
 
 	Kernel32Handle = LoadLibrary("KERNEL32.DLL");
@@ -1503,9 +1507,6 @@ CreateRestrictedProcess(char *cmd, PROCESS_INFORMATION *processInfo, bool as_ser
 		}
 	}
 
-#ifndef __CYGWIN__
-	AddUserToDacl(processInfo->hProcess);
-#endif
 
 	CloseHandle(restrictedToken);
 

src/include/port.h

@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/port.h,v 1.126 2009/07/16 17:43:52 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/port.h,v 1.127 2009/11/14 15:39:36 mha Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -81,7 +81,7 @@ extern int find_other_exec(const char *argv0, const char *target,
 
 /* Windows security token manipulation (in exec.c) */
 #ifdef WIN32
-extern BOOL AddUserToDacl(HANDLE hProcess);
+extern BOOL AddUserToTokenDacl(HANDLE hToken);
 #endif
 
 

src/port/exec.c

@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/port/exec.c,v 1.64 2009/07/27 08:46:10 mha Exp $
+ *	  $PostgreSQL: pgsql/src/port/exec.c,v 1.65 2009/11/14 15:39:36 mha Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -664,11 +664,10 @@ set_pglocale_pgservice(const char *argv0, const char *app)
 #ifdef WIN32
 
 /*
- * AddUserToDacl(HANDLE hProcess)
+ * AddUserToTokenDacl(HANDLE hToken)
  *
- * This function adds the current user account to the default DACL
- * which gets attached to the restricted token used when we create
- * a restricted process.
+ * This function adds the current user account to the restricted
+ * token used when we create a restricted process.
  *
  * This is required because of some security changes in Windows
  * that appeared in patches to XP/2K3 and in Vista/2008.
@@ -681,13 +680,13 @@ set_pglocale_pgservice(const char *argv0, const char *app)
  * and CreateProcess() calls when running as Administrator.
  *
  * This function fixes this problem by modifying the DACL of the
- * specified process and explicitly re-adding the current user account.
- * This is still secure because the Administrator account inherits it's
- * privileges from the Administrators group - it doesn't have any of
- * it's own.
+ * token the process will use, and explicitly re-adding the current
+ * user account.  This is still secure because the Administrator account
+ * inherits its privileges from the Administrators group - it doesn't
+ * have any of its own.
  */
 BOOL
-AddUserToDacl(HANDLE hProcess)
+AddUserToTokenDacl(HANDLE hToken)
 {
 	int			i;
 	ACL_SIZE_INFORMATION asi;
@@ -695,7 +694,6 @@ AddUserToDacl(HANDLE hProcess)
 	DWORD		dwNewAclSize;
 	DWORD		dwSize = 0;
 	DWORD		dwTokenInfoLength = 0;
-	HANDLE		hToken = NULL;
 	PACL		pacl = NULL;
 	PTOKEN_USER	pTokenUser = NULL;
 	TOKEN_DEFAULT_DACL tddNew;
@@ -703,13 +701,6 @@ AddUserToDacl(HANDLE hProcess)
 	TOKEN_INFORMATION_CLASS tic = TokenDefaultDacl;
 	BOOL		ret = FALSE;
 
-	/* Get the token for the process */
-	if (!OpenProcessToken(hProcess, TOKEN_QUERY | TOKEN_ADJUST_DEFAULT, &hToken))
-	{
-		log_error("could not open process token: %lu", GetLastError());
-		goto cleanup;
-	}
-
 	/* Figure out the buffer size for the DACL info */
 	if (!GetTokenInformation(hToken, tic, (LPVOID) NULL, dwTokenInfoLength, &dwSize))
 	{
@@ -789,7 +780,7 @@ AddUserToDacl(HANDLE hProcess)
 	}
 
 	/* Add the new ACE for the current user */
-	if (!AddAccessAllowedAce(pacl, ACL_REVISION, GENERIC_ALL, pTokenUser->User.Sid))
+	if (!AddAccessAllowedAceEx(pacl, ACL_REVISION, OBJECT_INHERIT_ACE, GENERIC_ALL, pTokenUser->User.Sid))
 	{
 		log_error("could not add access allowed ACE: %lu", GetLastError());
 		goto cleanup;
@@ -816,9 +807,6 @@ cleanup:
 	if (ptdd)
 		LocalFree((HLOCAL) ptdd);
 
-	if (hToken)
-		CloseHandle(hToken);
-
 	return ret;
 }
 

src/test/regress/pg_regress.c

@@ -11,7 +11,7 @@
  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/test/regress/pg_regress.c,v 1.64 2009/08/18 10:30:41 teodor Exp $
+ * $PostgreSQL: pgsql/src/test/regress/pg_regress.c,v 1.65 2009/11/14 15:39:36 mha Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1021,6 +1021,10 @@ spawn_process(const char *cmdline)
 	cmdline2 = malloc(strlen(cmdline) + 8);
 	sprintf(cmdline2, "cmd /c %s", cmdline);
 
+#ifndef __CYGWIN__
+	AddUserToTokenDacl(restrictedToken);
+#endif
+
 	if (!CreateProcessAsUser(restrictedToken,
 							 NULL,
 							 cmdline2,
@@ -1038,10 +1042,6 @@ spawn_process(const char *cmdline)
 		exit_nicely(2);
 	}
 
-#ifndef __CYGWIN__
-	AddUserToDacl(pi.hProcess);
-#endif
-
 	free(cmdline2);
 
 	ResumeThread(pi.hThread);