diff --git a/Makefile b/Makefile
index 7091d744..17ddb649 100644
--- a/Makefile
+++ b/Makefile
@@ -22,7 +22,7 @@ ifeq ($(ARCH), mac)
 	CXXFLAGS += -DAPPLE -stdlib=libc++
 	LDFLAGS += -stdlib=libc++ -lpthread -ldl \
 		-framework Cocoa -framework OpenGL -framework IOKit -framework CoreVideo \
-		-Ldep/lib -lGLEW -lglfw -ljansson -lsamplerate -lcurl -lzip -lrtaudio -lrtmidi -lcrypto
+		-Ldep/lib -lGLEW -lglfw -ljansson -lsamplerate -lcurl -lzip -lrtaudio -lrtmidi -lcrypto -lsandbox
 	TARGET = Rack
 	BUNDLE = dist/$(TARGET).app
 endif
@@ -56,11 +56,6 @@ ifeq ($(ARCH), win)
 	env PATH=dep/bin:/mingw64/bin ./$<
 endif
 
-sandbox-run: $(TARGET)
-ifeq ($(ARCH), mac)
-	sandbox-exec -D RACK_HOME=$(PWD) -f ./Rack.sb `which sh` -c 'DYLD_FALLBACK_LIBRARY_PATH=dep/lib ./$<'                                                                      2 ↵  ✹ ✭sandbox ‹2.4.2›
-endif
-
 debug: $(TARGET)
 ifeq ($(ARCH), lin)
 	LD_LIBRARY_PATH=dep/lib gdb -ex run ./Rack
@@ -97,6 +92,7 @@ ifeq ($(ARCH), mac)
 	mkdir -p $(BUNDLE)/Contents/Resources
 	cp Info.plist $(BUNDLE)/Contents/
 	cp -R LICENSE* res $(BUNDLE)/Contents/Resources
+	cp Rack.sb $(BUNDLE)/Contents/Resources
 
 	mkdir -p $(BUNDLE)/Contents/MacOS
 	cp Rack $(BUNDLE)/Contents/MacOS/
diff --git a/Rack.sb b/Rack.sb
index 9a04fb05..8feb9e92 100644
--- a/Rack.sb
+++ b/Rack.sb
@@ -1,26 +1,15 @@
-
 (version 1)
-(debug allow)
-
-(define rack-home "RACK_HOME")
+(import "system.sb")
 
-; This is needed for IPC on OSX >= 10.6
 (allow ipc-posix-shm)
 
-; Allow inbound and outbound connections
 (allow network-outbound)
 (allow network-inbound)
 
-; Allow reading with sysctl
 (allow sysctl-read)
 
-; Allow it to read metadata
 (allow file-read-metadata)
 
-; Allow it to run processes and fork
-(allow process*)
-
-; Allow it to signal self
 (allow signal)
 
 (allow iokit-open)
@@ -29,34 +18,8 @@
 
 (allow system-socket)
 
-(allow file-read* file-write* (subpath (param rack-home)))
-
-; Allow file reading
-(allow file-read*
-    (regex
-        #"^/Applications/Rack.app"
-        #"^/Library/*"
-        #"^/System/Library/*"
-        #"^/usr/*"
-        #"^/dev/*"
-        #"/Users/jon/Projects/Rack"
-        #"/Users/[^.]+/Library/Saved Application State/com.vcvrack.rack.savedState"
-    )
-)
-
-; Allow write access to a subset of the above
-(allow file-write*
-    (regex
-        #"^/private/var/*"
-        #"^/private/tmp/*"
-        #"^/var/folders/th/*"
-    )
-)
-
-(allow file-issue-extension
-    (regex
-        #"^/private/var/*"
-    )
-)
+(allow file-read* (subpath (param "rackLocal")))
+(allow file-write* (subpath (param "rackLocal")))
+(allow file-read* (subpath (param "rackGlobal")))
 
 (deny default)
diff --git a/src/main.cpp b/src/main.cpp
index 62ea55fb..7aa30331 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -32,7 +32,10 @@ int main(int argc, char* argv[]) {
 		info("Local directory: %s", localDir.c_str());
 	}
 
-	sandboxInit();
+	if(!sandboxInit()) {
+		info("Refusing to run without sandbox");
+		exit(1);
+	}
 	pluginInit();
 	engineInit();
 	guiInit();
diff --git a/src/sandbox.cpp b/src/sandbox.cpp
index daad09eb..e6cfdb5d 100644
--- a/src/sandbox.cpp
+++ b/src/sandbox.cpp
@@ -1,13 +1,71 @@
 #include "sandbox.hpp"
 #include "util.hpp"
+#include "asset.hpp"
+#include <vector>
+
 namespace rack {
 #if defined(ARCH_MAC)
 #include <sandbox.h>
+#include <stdlib.h>
+#include <sys/syslimits.h>
+extern "C" {
+
+int sandbox_init_with_parameters(const char *profile, uint64_t flags, const char *const parameters[], char **errorbuf);
+// Possible values for 'flags':
+#define SANDBOX_STRING  0x0000
+#define SANDBOX_NAMED   0x0001
+#define SANDBOX_BUILTIN 0x0002
+#define SANDBOX_FILE    0x0003
+
+}
+
+struct SandboxParams {
+  void* buf;
+  size_t count;
+  size_t size;
+};
 
 bool sandboxInit() {
-  char* error_buff = NULL;
-  //int error = sandbox_init(final_sandbox_profile_str.c_str(), 0, &error_buff);
-  int error = sandbox_init(kSBXProfileNoInternet, SANDBOX_NAMED, &error_buff);
+
+  /*
+  char* params = sandbox_create_params();
+  if (!params)
+    return false;
+
+  sandbox_set_param(params, "rackGlobal", assetGlobal("").c_str());
+  sandbox_set_param(params, "rackLocal", assetLocal("").c_str());
+  */
+  std::string profilePath = assetGlobal("Rack.sb").c_str();
+  FILE *file = fopen(profilePath.c_str(), "rb");
+  if(!file) {
+    info("Couldn't read sandbox profile");
+    return false;
+  }
+  fseek(file, 0, SEEK_END);
+  long fsize = ftell(file);
+  fseek(file, 0, SEEK_SET);  //same as rewind(f);
+
+  char *profileStr = (char*)malloc(fsize + 1);
+  fread(profileStr, fsize, 1, file);
+  fclose(file);
+  profileStr[fsize] = 0;
+
+  std::vector<const char *> params;
+  char resolved_path[PATH_MAX];
+
+  params.push_back("rackGlobal");
+  realpath(assetGlobal("").c_str(), resolved_path);
+  params.push_back(resolved_path);
+
+  params.push_back("rackLocal");
+  realpath(assetLocal("").c_str(), resolved_path);
+  params.push_back(resolved_path);
+
+  // The parameters array is null terminated.
+  params.push_back(nullptr);
+
+  char* error_buff = nullptr;
+  int error = sandbox_init_with_parameters(profileStr, SANDBOX_STRING, params.data(), &error_buff);
   bool success = (error == 0 && error_buff == NULL);
   if(!success) {
     info("Sandbox initialization error (%d): %s", error, error_buff);
@@ -16,6 +74,11 @@ bool sandboxInit() {
   }
   sandbox_free_error(error_buff);
 
+  FILE *file2 = fopen("/Users/jon/Documents/mg.txt", "rb");
+  if(!file2) {
+    info("Couldn't read private file");
+  }
+
   return success;
 }