.gitignore

@@ -1,3 +1,4 @@
 build/*
 .clang-tidy
 .cache
+test/protected/*

Makefile

@@ -1,13 +1,34 @@
 SHELL=/bin/bash
 
+# configurable options
+
+SOURCES_DIR := ./src
+TESTS_DIR := ./tests
+BUILD_DIR := ./build
+
 CC := gcc
 CXX := g++
 
-CFLAGS := -I/usr/include/fuse -D_FILE_OFFSET_BITS=64
-LDFLAGS := -lfuse3 -pthread
 
-ifdef DEBUG
+# dependencies
-	CFLAGS += -O0 -pedantic -Wall -Wextra -Wcast-align \
+
+PACKAGE_NAMES := fuse3
+
+ifeq ($(TEST), 1)
+	#	PACKAGE_NAMES += check # TODO: use check?
+endif
+
+
+# set up cflags and libs
+
+CFLAGS := -D_FILE_OFFSET_BITS=64
+LDFLAGS :=
+
+CFLAGS += $(shell pkg-config --cflags $(PACKAGE_NAMES))
+LDFLAGS += $(shell pkg-config --libs $(PACKAGE_NAMES))
+
+ifeq ($(DEBUG),1)
+	CFLAGS += -O0 -pedantic -g -Wall -Wextra -Wcast-align \
 						-Wcast-qual -Wdisabled-optimization -Wformat=2 \
 						-Winit-self -Wlogical-op -Wmissing-declarations \
 						-Wmissing-include-dirs -Wredundant-decls -Wshadow \
@@ -19,12 +40,32 @@ else
 	LDFLAGS +=
 endif
 
-SOURCES_DIR := ./src
-BUILD_DIR := ./build
 
-build: $(BUILD_DIR)/main.o $(BUILD_DIR)/fuse_operations.o $(BUILD_DIR)/sourcefs.o $(BUILD_DIR)/ui-socket.o
+# set up targets 
+
+TARGETS := icfs
+
+ifeq ($(TEST), 1)
+	TARGETS += icfs_test
+endif
+
+
+# build!
+
+default: $(TARGETS)
+
+.PHONY: clean
+
+icfs: $(BUILD_DIR)/main.o $(BUILD_DIR)/fuse_operations.o $(BUILD_DIR)/sourcefs.o $(BUILD_DIR)/ui-socket.o
 	$(CC) $(CFLAGS) $^ $(LDFLAGS) -o $(BUILD_DIR)/icfs
 
+icfs_test: $(BUILD_DIR)/main.o $(BUILD_DIR)/fuse_operations.o $(BUILD_DIR)/sourcefs.o $(BUILD_DIR)/ui-socket.o
+	$(CC) $(CFLAGS) $^ $(LDFLAGS) -o $(BUILD_DIR)/icfs_test
+	# $(BUILD_DIR)/icfs_test # TODO: implement testing
+
+$(BUILD_DIR)/test_access_control.o: $(TESTS_DIR)/test_access_control.c
+	$(CC) $(CFLAGS) -c $< $(LDFLAGS) -o $@
+
 $(BUILD_DIR)/main.o: $(SOURCES_DIR)/main.c
 	$(CC) $(CFLAGS) -c $< $(LDFLAGS) -o $(BUILD_DIR)/main.o
 
@@ -38,4 +79,4 @@ $(BUILD_DIR)/ui-socket.o: $(SOURCES_DIR)/ui-socket.c $(SOURCES_DIR)/ui-socket.h
 	$(CC) $(CFLAGS) -c $< $(LDFLAGS) -o $@
 
 clean:
-	rm $(BUILD_DIR)/*
+	rm $(BUILD_DIR)/*.o $(BUILD_DIR)/icfs*

README.md

@@ -12,15 +12,17 @@ Traditional access control mechanisms in operating systems allow the same level
 
 ## Building
 
-* Install dependencies
+- Install dependencies
-    + fuse, libfuse (v3 or later)
+  - libfuse3
-        - Debian: `sudo apt install fuse3 libfuse3-dev`
+    - Debian: `sudo apt install fuse3 libfuse3-dev`
-    + zenity
+  - zenity
-        - Debian: `sudo apt install zenity`
+    - Debian: `sudo apt install zenity`
-* Build using `make`:
+  - Build tools
-    + In the project directory: `make`
+    - Debian: `sudo apt install gcc make pkg-config`
-    + Use `make DEBUG=1` for testing.
+- Build using `make`:
-* Resulting binaries should appear in the `build` directory.
+  - In the project directory: `make`
+  - Use `make DEBUG=1` for testing.
+- Resulting binaries should appear in the `build` directory.
 
 ## Usage
 

test/mock/zenity

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# fake-zenity: script that mocks the behavior of zenity based on the ./.fake-zenity-response file
+
+if [[ $1 == "--set-fake-response" ]]; then
+  #someone knows we are fake :)
+  echo $2 >~/.fake_zenity_response
+else
+  if [ -f ~/.fake_zenity_response ]; then
+    FAKE_ZENITY_RESPONSE=$(cat ~/.fake_zenity_response)
+
+    if [[ $FAKE_ZENITY_RESPONSE == "yes_tmp" ]]; then
+      printf "Allow this time\n"
+      exit 1
+    elif [[ $FAKE_ZENITY_RESPONSE == "no" ]]; then
+      exit 1
+    elif [[ $FAKE_ZENITY_RESPONSE == "yes" ]]; then
+      exit 0
+    fi
+  fi
+fi
+
+exit -1 # TODO: call actual zenity here

test/test.bash

@@ -0,0 +1,73 @@
+#!/bin/bash
+
+# clean what was left from previous tests
+
+rm -rf ./protected
+mkdir protected
+touch ./protected/do-not-remove ./protected/should-be-removed
+echo "Free code, free world." >./protected/this-only
+
+# set up the fake-zenity
+
+PATH="$(realpath ./mock/):$PATH"
+
+# mount the filesystem
+
+echo "Run $(date -u +%Y-%m-%dT%H:%M:%S) "
+valgrind -s ../build/icfs -o default_permissions ./protected &
+
+sleep 1
+
+# Try to touch files in the directory
+
+#echo \"manual\" >./protected/manual
+
+zenity --set-fake-response no
+echo "first" >./protected/first 2>/dev/null &&
+  echo "[ICFS-TEST]: echo can create protected/first despite access being denied!" ||
+  echo "[ICFS-TEST]: OK" # EACCESS
+
+zenity --set-fake-response yes_tmp
+echo "second" >./protected/second 2>/dev/null &&
+  echo "[ICFS-TEST]: OK" ||
+  echo "[ICFS-TEST]: echo cannot create protected/second despite access being permitted!" # OK
+
+# Test whether permissons work
+
+zenity --set-fake-response yes_tmp
+cat ./protected/first >/dev/null 2>/dev/null &&
+  echo "[ICFS-TEST]: cat can read a non-existant file ./protected/first!" ||
+  echo "[ICFS-TEST]: OK" # ENOENT
+
+zenity --set-fake-response yes_tmp
+cat ./protected/second >/dev/null 2>/dev/null &&
+  echo "[ICFS-TEST]: OK" ||
+  echo "[ICFS-TEST]: cat cannot open protected/second despite access being permitted!" # "second"
+
+zenity --set-fake-response yes_tmp
+cat ./protected/this-only >/dev/null 2>/dev/null &&
+  echo "[ICFS-TEST]: OK" ||
+  echo "[ICFS-TEST]: echo cannot create protected/second despite access being permitted!" # "Free code, free world."
+
+#parallel ::: "cat ./protected/sudo-only > /dev/null 2> /dev/null \
+#    && echo \"[ICFS-TEST]: cat can access files owned by root!\" \
+#    || echo \"[ICFS-TEST]: OK\"" # EACCESS
+
+# test the removal
+
+zenity --set-fake-response no
+rm ./protected/do-not-remove >/dev/null 2>/dev/null &&
+  echo "[ICFS-TEST]: rm can unlink protected/do-not-remove despite access being denied!" ||
+  echo "[ICFS-TEST]: OK" # EACCESS
+
+zenity --set-fake-response yes_tmp
+rm ./protected/should-be-removed >/dev/null 2>/dev/null &&
+  echo "[ICFS-TEST]: OK" ||
+  echo "[ICFS-TEST]: rm cannot unlink protected/should-be-removed despite access being permitted!" # OK
+
+# unmount
+
+sleep 0.5
+#lsof +f -- $(realpath ./protected)
+umount $(realpath ./protected)
+sleep 0.5