Add basic pledge/unveil sandbox on OpenBSD

[tinc] / src / tincd.c

diff --git a/src/tincd.c b/src/tincd.c
index edb03f5..539f527 100644 (file)
--- a/src/tincd.c
+++ b/src/tincd.c
@@ -55,6 +55,7 @@
 #include "xalloc.h"
 #include "version.h"
 #include "random.h"
+#include "sandbox.h"
 
 /* If nonzero, display usage information and exit. */
 static bool show_help = false;
@@ -322,6 +323,44 @@ exit_fail:
        return false;
 }
 
+static bool read_sandbox_level(void) {
+       sandbox_level_t level;
+       char *value = NULL;
+
+       if(get_config_string(lookup_config(&config_tree, "Sandbox"), &value)) {
+               if(!strcasecmp("off", value)) {
+                       level = SANDBOX_NONE;
+               } else if(!strcasecmp("normal", value)) {
+                       level = SANDBOX_NORMAL;
+               } else if(!strcasecmp("high", value)) {
+                       level = SANDBOX_HIGH;
+               } else {
+                       logger(DEBUG_ALWAYS, LOG_ERR, "Bad sandbox value %s!", value);
+                       free(value);
+                       return false;
+               }
+
+               free(value);
+       } else {
+#ifdef HAVE_SANDBOX
+               level = SANDBOX_NORMAL;
+#else
+               level = SANDBOX_NONE;
+#endif
+       }
+
+#ifndef HAVE_SANDBOX
+
+       if(level > SANDBOX_NONE) {
+               logger(DEBUG_ALWAYS, LOG_ERR, "Sandbox is used but is not supported on this platform");
+               return false;
+       }
+
+#endif
+       sandbox_set_level(level);
+       return true;
+}
+
 static bool drop_privs(void) {
 #ifndef HAVE_WINDOWS
        uid_t uid = 0;
@@ -373,7 +412,8 @@ static bool drop_privs(void) {
                }
 
 #endif
-       return true;
+
+       return sandbox_enter();
 }
 
 #ifdef HAVE_WINDOWS
@@ -448,6 +488,9 @@ int main(int argc, char **argv) {
 #ifdef HAVE_MINIUPNPC
                        " miniupnpc"
 #endif
+#ifdef HAVE_SANDBOX
+                       " sandbox"
+#endif
 #ifdef ENABLE_UML
                        " uml"
 #endif
@@ -530,6 +573,10 @@ int main(int argc, char **argv) {
                return 1;
        }
 
+       if(!read_sandbox_level()) {
+               return 1;
+       }
+
        if(debug_level == DEBUG_NOTHING) {
                int level = 0;