wmi-1.3.16 from opsview.com

2019-02-16 00:16:52 +01:00
parent 163fdd3d1b
commit 17b3af2911
2146 changed files with 678824 additions and 0 deletions
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+/* 
+   Unix SMB/CIFS implementation.
+
+   gain/lose root privileges
+
+   Copyright (C) Andrew Tridgell 2004
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "system/filesys.h"
+
+/**
+ * @file
+ * @brief Gaining/losing root privileges
+ */
+
+/*
+  there are times when smbd needs to temporarily gain root privileges
+  to do some operation. To do this you call root_privileges(), which
+  returns a talloc handle. To restore your previous privileges
+  talloc_free() this pointer.
+
+  Note that this call is considered successful even if it does not
+  manage to gain root privileges, but it will call smb_abort() if it
+  fails to restore the privileges afterwards. The logic is that
+  failing to gain root access can be caught by whatever operation
+  needs to be run as root failing, but failing to lose the root
+  privileges is dangerous.
+
+  This also means that this code is safe to be called from completely
+  unprivileged processes.
+*/
+
+struct saved_state {
+	uid_t uid;
+};
+
+static int privileges_destructor(struct saved_state *s)
+{
+	if (geteuid() != s->uid &&
+	    seteuid(s->uid) != 0) {
+		smb_panic("Failed to restore privileges");
+	}
+	return 0;
+}
+
+/**
+ * Obtain root privileges for the current process.
+ *
+ * The privileges can be dropped by talloc_free()-ing the 
+ * token returned by this function
+ */
+void *root_privileges(void)
+{
+	struct saved_state *s;
+	s = talloc(NULL, struct saved_state);
+	if (!s) return NULL;
+	s->uid = geteuid();
+	if (s->uid != 0) {
+		seteuid(0);
+	}
+	talloc_set_destructor(s, privileges_destructor);
+	return s;
+}