Added filename translation to the ui-socker

For now, perm table does not set the thrid parameter to anything useful

Makefile

@@ -71,7 +71,7 @@ $(BUILD_DIR)/main.o: $(SOURCES_DIR)/main.c
 $(BUILD_DIR)/fuse_operations.o: $(SOURCES_DIR)/fuse_operations.c $(SOURCES_DIR)/fuse_operations.h
 	$(CC) $(CFLAGS) -c $< $(LDFLAGS) -o $@
 
-$(BUILD_DIR)/sourcefs.o: $(SOURCES_DIR)/sourcefs.c $(SOURCES_DIR)/sourcefs.h
+$(BUILD_DIR)/sourcefs.o: $(SOURCES_DIR)/sourcefs.c $(SOURCES_DIR)/sourcefs.h $(SOURCES_DIR)/real_filename.h
 	$(CC) $(CFLAGS) -c $< $(LDFLAGS) -o $@
 
 $(BUILD_DIR)/ui-socket.o: $(SOURCES_DIR)/ui-socket.c $(SOURCES_DIR)/ui-socket.h

src/access_t.h

@@ -0,0 +1,6 @@
+#ifndef ACCESS_T_H
+#define ACCESS_T_H
+
+typedef enum { DENY, ALLOW, ALLOW_TEMP, NDEF } access_t;
+
+#endif // !ACCESS_T_H

src/fuse_operations.c

@@ -11,6 +11,8 @@
   See the file LICENSE.
 */
 
+#include "real_filename.h"
+#include <assert.h>
 #include <stddef.h>
 #define FUSE_USE_VERSION 31
 
@@ -94,9 +96,6 @@ const char *get_process_name_by_pid(const int pid) {
   */
 }
 
-// TODO: move this somewhere else
-const char *real_filename(const char *filename) { return filename; }
-
 static void *xmp_init(struct fuse_conn_info *conn, struct fuse_config *cfg) {
   (void)conn;
   cfg->use_ino = 1;
@@ -120,6 +119,7 @@ static void *xmp_init(struct fuse_conn_info *conn, struct fuse_config *cfg) {
   cfg->attr_timeout = 0;
   cfg->negative_timeout = 0;
   fprintf(stderr, "%d\n", getpid());
+  assert(get_mountpoint() != NULL);
 
   return NULL;
 }
@@ -157,7 +157,7 @@ static int xmp_access(const char *path, int mask) {
 
     // fprintf(stderr, "%s, %d\n", path, ask_access(path, pi));
 
-    if (!interactive_access(real_filename(path), proc_info, 0)) {
+    if (!interactive_access(path, proc_info, 0)) {
       free((void *)proc_info.name);
       return -EACCES;
     }
@@ -323,7 +323,7 @@ static int xmp_unlink(const char *path) {
 
   // fprintf(stderr, "%s, %d\n", path, ask_access(path, pi));
 
-  if (!interactive_access(real_filename(path), pi, 0)) {
+  if (!interactive_access(path, pi, 0)) {
     free(pi.name);
     return -EACCES;
   }
@@ -371,15 +371,14 @@ static int xmp_rename(const char *from, const char *to, unsigned int flags) {
 
   // fprintf(stderr, "%s, %d\n", path, ask_access(path, pi));
 
-  if (!interactive_access(real_filename(from), pi, 0)) {
+  if (!interactive_access(from, pi, 0)) {
     free(pi.name);
     return -EACCES;
   }
 
   // the "to" file may exist and the process needs to get persmission to modify
   // it
-  if (source_access(to, F_OK) == 0 &&
-      !interactive_access(real_filename(to), pi, 0)) {
+  if (source_access(to, F_OK) == 0 && !interactive_access(to, pi, 0)) {
     free(pi.name);
     return -EACCES;
   }
@@ -402,7 +401,7 @@ static int xmp_link(const char *from, const char *to) {
   pi.name = get_process_name_by_pid(pi.PID);
 
   // fprintf(stderr, "%s, %d\n", path, ask_access(path, pi));
-  if (!interactive_access(real_filename(from), pi, 0)) {
+  if (!interactive_access(from, pi, 0)) {
     free(pi.name);
     return -EACCES;
   }
@@ -427,7 +426,7 @@ static int xmp_chmod(const char *path, mode_t mode, struct fuse_file_info *fi) {
   pi.name = get_process_name_by_pid(pi.PID);
 
   // fprintf(stderr, "%s, %d\n", path, ask_access(path, pi));
-  if (!interactive_access(real_filename(path), pi, 0)) {
+  if (!interactive_access(path, pi, 0)) {
     free(pi.name);
     return -EACCES;
   }
@@ -458,7 +457,7 @@ static int xmp_chown(const char *path, uid_t uid, gid_t gid,
   pi.name = get_process_name_by_pid(pi.PID);
 
   // fprintf(stderr, "%s, %d\n", path, ask_access(path, pi));
-  if (!interactive_access(real_filename(path), pi, 0)) {
+  if (!interactive_access(path, pi, 0)) {
     free(pi.name);
     return -EACCES;
   }
@@ -518,7 +517,7 @@ static int xmp_create(const char *path, mode_t mode,
 
   // fprintf(stderr, "%s, %d\n", path, ask_access(path, pi));
 
-  if (!interactive_access(real_filename(path), pi, GRANT_PERM)) {
+  if (!interactive_access(path, pi, GRANT_PERM)) {
     free(pi.name);
     return -EACCES;
   }
@@ -542,7 +541,7 @@ static int xmp_open(const char *path, struct fuse_file_info *fi) {
   pi.name = get_process_name_by_pid(pi.PID);
 
   // fprintf(stderr, "%s, %d\n", path, ask_access(path, pi));
-  if (!interactive_access(real_filename(path), pi, 0)) {
+  if (!interactive_access(path, pi, 0)) {
     free(pi.name);
     return -EACCES;
   }

src/gui/Makefile

@@ -0,0 +1,69 @@
+SHELL=/bin/bash
+
+# configurable options
+
+SOURCES_DIR := .
+TESTS_DIR := .
+BUILD_DIR := .
+
+CC := gcc
+CXX := g++
+
+
+# dependencies
+
+PACKAGE_NAMES := gtk4 libadwaita-1
+
+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 \
+						-Wsign-conversion -Wstrict-overflow=5 \
+						-Wswitch-default -Wundef -Wno-unused
+	LDFLAGS += 
+else
+	CFLAGS += -O3
+	LDFLAGS +=
+endif
+
+
+# set up targets 
+
+TARGETS := $(BUILD_DIR)/zenity
+
+ifeq ($(TEST), 1)
+	TARGETS += zenity_test
+endif
+
+
+# build!
+
+default: $(TARGETS)
+
+.PHONY: clean zenity_test
+
+zenity_test: $(BUILD_DIR)/zenity
+	./zenity 666 cat /home/fedir Downloads
+
+$(BUILD_DIR)/zenity: $(BUILD_DIR)/zenity.o
+	$(CC) $(CFLAGS) $^ $(LDFLAGS) -o $(BUILD_DIR)/zenity
+
+$(BUILD_DIR)/zenity.o: $(SOURCES_DIR)/zenity-clone.c
+	$(CC) $(CFLAGS) -c $< $(LDFLAGS) -o $(BUILD_DIR)/zenity.o
+
+clean:
+	rm $(BUILD_DIR)/*.o $(BUILD_DIR)/zenity

src/gui/zenity-clone.c

@@ -0,0 +1,153 @@
+#include "gio/gio.h"
+#include "glib-object.h"
+#include "glib.h"
+#include <adwaita.h>
+#include <gtk/gtk.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define YES 0
+#define NO 1
+#define PERM 2
+
+int exit_code = 0;
+gboolean is_permanent = false;
+GtkEntryBuffer *entry_buffer = NULL;
+GtkWidget *checkbox = NULL;
+
+static void negative_response(GtkWindow *window) {
+  fprintf(stdout, "%s", gtk_entry_buffer_get_text(entry_buffer));
+  exit_code = (gtk_check_button_get_active(GTK_CHECK_BUTTON(checkbox)))
+                  ? YES | PERM
+                  : YES;
+  gtk_window_close(window);
+}
+
+static void positive_response(GtkWindow *window) {
+  fprintf(stdout, "%s", gtk_entry_buffer_get_text(entry_buffer));
+  exit_code = (gtk_check_button_get_active(GTK_CHECK_BUTTON(checkbox)))
+                  ? NO | PERM
+                  : NO;
+  gtk_window_close(window);
+}
+
+static void on_check_button_toggled(GtkToggleButton *button,
+                                    gpointer user_data) {
+  gboolean active = gtk_toggle_button_get_active(button);
+}
+
+static void on_activate(GtkApplication *app, gpointer user_data) {
+  // Create the main window
+  AdwWindow *window = ADW_WINDOW(adw_window_new());
+  gtk_window_set_application(GTK_WINDOW(window), app);
+  gtk_window_set_title(GTK_WINDOW(window), "icfs");
+  // gtk_window_set_default_size(GTK_WINDOW(window), 300, 150);
+
+  AdwStatusPage *content = ADW_STATUS_PAGE(adw_status_page_new());
+  adw_status_page_set_title(content, "Allow access?");
+
+  char *description = NULL;
+  asprintf(
+      &description,
+      "Allow process <tt>%s</tt> with PID <tt>%s</tt> to access <tt>%s</tt>",
+      g_object_get_data(G_OBJECT(app), "accessing_name"),
+      g_object_get_data(G_OBJECT(app), "accessing_pid"),
+      g_object_get_data(G_OBJECT(app), "access_dir"));
+  adw_status_page_set_description(content, description);
+  free(description);
+
+  entry_buffer = gtk_entry_buffer_new(
+      g_object_get_data(G_OBJECT(app), "access_dir"),
+      strlen(g_object_get_data(G_OBJECT(app), "access_dir")));
+
+  GtkWidget *entry = gtk_entry_new();
+  gtk_entry_set_buffer(GTK_ENTRY(entry), entry_buffer);
+  gtk_entry_set_placeholder_text(GTK_ENTRY(entry), "Enter filename");
+  gtk_widget_set_hexpand(entry, TRUE);
+
+  // Create a prefix label and box
+  GtkWidget *entry_box = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
+  GtkWidget *prefix_label =
+      gtk_label_new(g_object_get_data(G_OBJECT(app), "root_folder"));
+  gtk_box_append(GTK_BOX(entry_box), prefix_label);
+  gtk_box_append(GTK_BOX(entry_box), entry);
+
+  checkbox = gtk_check_button_new_with_label("Permanent");
+  gtk_check_button_set_active(GTK_CHECK_BUTTON(checkbox), false);
+  // gtk_widget_set_halign(checkbox, GTK_ALIGN_CENTER);
+
+  GtkWidget *yes_button = gtk_button_new_with_label("Yes");
+  gtk_widget_set_hexpand(yes_button, TRUE);
+  g_signal_connect_swapped(yes_button, "clicked", G_CALLBACK(positive_response),
+                           window);
+
+  GtkWidget *no_button = gtk_button_new_with_label("No");
+  gtk_widget_set_hexpand(no_button, TRUE);
+  g_signal_connect_swapped(no_button, "clicked", G_CALLBACK(negative_response),
+                           window);
+
+  GtkWidget *button_box = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 6);
+  gtk_box_append(GTK_BOX(button_box), yes_button);
+  gtk_box_append(GTK_BOX(button_box), no_button);
+  gtk_widget_set_halign(button_box, GTK_ALIGN_FILL);
+
+  // Combine everything in a box
+  GtkWidget *box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 12);
+  gtk_box_append(GTK_BOX(box), GTK_WIDGET(content));
+  gtk_box_append(GTK_BOX(box), entry_box);
+  gtk_box_append(GTK_BOX(box), checkbox);
+  gtk_box_append(GTK_BOX(box), button_box);
+  gtk_widget_set_margin_top(GTK_WIDGET(box), 12);
+  gtk_widget_set_margin_bottom(GTK_WIDGET(box), 12);
+  gtk_widget_set_margin_start(GTK_WIDGET(box), 12);
+  gtk_widget_set_margin_end(GTK_WIDGET(box), 12);
+
+  // g_signal_connect(window, "response", G_CALLBACK(gtk_window_close), window);
+
+  // Show the dialog
+  adw_window_set_content(window, box);
+  gtk_window_present(GTK_WINDOW(window));
+}
+
+static int on_command_line(GApplication *app, GApplicationCommandLine *cmdline,
+                           gpointer user_data) {
+  gchar **argv;
+  gint argc;
+
+  argv = g_application_command_line_get_arguments(cmdline, &argc);
+
+  // Handle your arguments here
+  if (argc >= 4) {
+    fprintf(stderr, "%s\n", argv[1]);
+    g_object_set_data_full(G_OBJECT(app), "accessing_pid", g_strdup(argv[1]),
+                           g_free);
+    g_object_set_data_full(G_OBJECT(app), "accessing_name", g_strdup(argv[2]),
+                           g_free);
+    g_object_set_data_full(G_OBJECT(app), "root_folder", g_strdup(argv[3]),
+                           g_free);
+    g_object_set_data_full(G_OBJECT(app), "access_dir", g_strdup(argv[4]),
+                           g_free);
+  }
+
+  g_strfreev(argv);
+
+  // Activate the application
+  g_application_activate(app);
+  return 0;
+}
+
+int main(int argc, char **argv) {
+  // Create a new application
+  AdwApplication *app = adw_application_new("com.example.zenityclone",
+                                            G_APPLICATION_HANDLES_COMMAND_LINE);
+
+  g_signal_connect(app, "command-line", G_CALLBACK(on_command_line), NULL);
+  g_signal_connect(app, "activate", G_CALLBACK(on_activate), NULL);
+
+  // Run the application
+  int status = g_application_run(G_APPLICATION(app), argc, argv);
+  g_object_unref(app);
+
+  return (status == 0) ? exit_code : status;
+}

src/main.c

@@ -56,6 +56,7 @@ int main(int argc, char *argv[]) {
   ret = fuse_main(argc - 1, argv, get_fuse_operations(), NULL);
 
   free((void *)mountpoint);
+  source_destroy();
   destroy_ui_socket();
   return ret;
 }

src/perm_permissions_table.c

@@ -7,6 +7,7 @@
 */
 
 #include "perm_permissions_table.h"
+#include "access_t.h"
 #include "process_info.h"
 #include <fcntl.h>
 #include <pthread.h>
@@ -23,9 +24,9 @@
 sqlite3 *perm_database = NULL;
 const char *const table_name = "permissions";
 // one row corresponds to a permission to access one file for one executable
-const int column_count = 2;
-const char *const schema[] = {"executable", "filename"};
-const char *const types[] = {"TEXT", "TEXT"};
+const int column_count = 3;
+const char *const schema[] = {"executable", "filename", "mode"};
+const char *const types[] = {"TEXT", "TEXT", "INTEGER"};
 uid_t ruid, euid, current_pid;
 pthread_mutex_t uid_switch = PTHREAD_MUTEX_INITIALIZER;
 
@@ -69,9 +70,10 @@ static int check_table_col_schema(void *notused, int argc, char **argv,
   }
   int column_num = atoi(argv[0]);
   if (column_num >= column_count) {
-    fprintf(stderr, "Table contains more columns than expected.\n");
+    fprintf(stderr, "Table contains unexpected amount of columns.\n");
     return 1;
   }
+
   if (strcmp(schema[column_num], argv[1]) == 0 &&
       strcmp(types[column_num], argv[2]) == 0) {
     return 0;
@@ -90,8 +92,9 @@ static int set_flag(void *flag, int argc, char **argv, char **colname) {
 
 int create_database_schema() {
   fprintf(stderr, "Creating table 'permissions'.\n");
-  const char *create_query = "CREATE TABLE permissions(executable TEXT NOT "
-                             "NULL, filename TEXT NOT NULL);";
+  const char *create_query =
+      "CREATE TABLE permissions(executable TEXT NOT "
+      "NULL, filename TEXT NOT NULL, mode INTEGER NOT NULL);";
   char *err = NULL;
   int ret = sqlite3_exec(perm_database, create_query, NULL, NULL, &err);
 
@@ -186,37 +189,41 @@ void destroy_perm_permissions_table() { sqlite3_close(perm_database); }
  *
  * @param filename: The file that the process is trying to access
  * @pram pi: The process information
- * @return: 0 if access is denied, 1 if access is allowed
+ * @return: access status - ALLOW, DENY or NDEF in case if no information was
+ * found
  */
-int check_perm_access(const char *filename, struct process_info pi) {
-  size_t query_len =
-      56 + strlen(table_name) + strlen(filename) + strlen(pi.name);
-  const char *query = malloc(query_len);
-  size_t should_be_written = snprintf(
-      query, query_len,
-      "SELECT * FROM %s WHERE executable = \'%s\' AND filename = \'%s\';",
-      table_name, pi.name, filename);
-  // -1 for the \0
-  if (should_be_written != query_len - 1) {
-    fprintf(stderr,
-            "Unexpected query size while permanent access rule check: "
-            "Expected %lu, but snprintf returned %lu. The query: %s\n",
-            query_len, should_be_written, query);
-    return 0;
+access_t check_perm_access(const char *filename, struct process_info pi) {
+
+  char *query = NULL;
+  int ret = asprintf(&query,
+                     "SELECT * FROM %s WHERE executable = \'%s\' "
+                     "AND filename = \'%s\' AND mode = TRUE;",
+                     table_name, pi.name, filename);
+
+  if (ret < 0) {
+    // If asprintf fails, the contents of query are undefined (see man
+    // asprintf). That does not explicitly rule out that query will be a valid
+    // pointer. But the risk of freeing a non-allocated pointer is too much to
+    // justify preparing for this.
+    fprintf(stderr, "Could not create query on access check");
+    perror("");
+    return NDEF;
   }
 
   char *sqlite_error = NULL;
   int flag = 0;
-  int ret = sqlite3_exec(perm_database, query, set_flag, &flag, &sqlite_error);
+  ret = sqlite3_exec(perm_database, query, set_flag, &flag, &sqlite_error);
+  free((void *)query);
   if (ret != SQLITE_OK) {
     fprintf(stderr, "SQLite returned an error: %s\n", sqlite_error);
     sqlite3_free(sqlite_error);
-    free(query);
-    return 0;
+    return NDEF;
   }
 
-  free(query);
-  return flag;
+  if (flag) {
+    return ALLOW;
+  }
+  return NDEF;
 }
 
 /**
@@ -227,23 +234,23 @@ int check_perm_access(const char *filename, struct process_info pi) {
  * @return: 0 on success, 1 on failure
  */
 int give_perm_access(const char *filename, struct process_info pi) {
-  size_t query_len =
-      30 + strlen(table_name) + strlen(filename) + strlen(pi.name);
-  const char *query = malloc(query_len);
-  size_t should_be_written =
-      snprintf(query, query_len, "INSERT INTO %s VALUES (\'%s\', \'%s\');",
-               table_name, pi.name, filename);
-  // -1 for the \0
-  if (should_be_written != query_len - 1) {
-    fprintf(stderr,
-            "Unexpected query size while permanent access rule insertion: "
-            "Expected %lu, but snprintf returned %lu\n",
-            query_len, should_be_written);
+  char *query = NULL;
+  int ret = asprintf(&query, "INSERT INTO %s VALUES (\'%s\', \'%s\', TRUE);",
+                     table_name, pi.name, filename);
+
+  if (ret < 0) {
+    // If asprintf fails, the contents of query are undefined (see man
+    // asprintf). That does not explicitly rule out that query will be a valid
+    // pointer. But the risk of freeing a non-allocated pointer is too much to
+    // justify preparing for this.
+    fprintf(stderr, "Could not create query on rule insertion");
+    perror("");
     return 1;
   }
 
   char *sqlite_error = NULL;
-  int ret = sqlite3_exec(perm_database, query, NULL, NULL, &sqlite_error);
+  ret = sqlite3_exec(perm_database, query, NULL, NULL, &sqlite_error);
+  free(query);
   if (ret != SQLITE_OK) {
     fprintf(stderr, "SQLite returned an error: %s\n", sqlite_error);
     sqlite3_free(sqlite_error);
@@ -251,6 +258,5 @@ int give_perm_access(const char *filename, struct process_info pi) {
     return 1;
   }
 
-  free(query);
   return 0;
 }

src/perm_permissions_table.h

@@ -9,6 +9,7 @@
 #ifndef PERM_PERMISSION_TABLE_H
 #define PERM_PERMISSION_TABLE_H
 
+#include "access_t.h"
 #include "process_info.h"
 
 /**
@@ -29,9 +30,10 @@ void destroy_perm_permissions_table();
  *
  * @param filename: The file that the process is trying to access
  * @pram pi: The process information
- * @return: 0 if access is denied, 1 if access is allowed
+ * @return: access status - ALLOW, DENY or NDEF in case if no information was
+ * found
  */
-int check_perm_access(const char *filename, struct process_info pi);
+access_t check_perm_access(const char *filename, struct process_info pi);
 
 /**
  * Gives permanent access to the process to the file.

src/real_filename.h

@@ -0,0 +1,7 @@
+#ifndef REAL_FILENAME_H
+#define REAL_FILENAME_H
+
+const char *real_filename(const char *filename);
+const char *get_mountpoint(void);
+
+#endif // !REAL_FILENAME_H

src/sourcefs.c

@@ -10,14 +10,14 @@
 
 #include "sourcefs.h"
 #include <dirent.h>
-#include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
-#include <sys/stat.h>
 #include <unistd.h>
 
 static struct source_files_handle {
+  const char *mountpoint;
   int root_fd;
 } handle;
 
@@ -30,6 +30,14 @@ const char *source_filename_translate(const char *filename) {
 }
 
 int source_init(const char *root_path) {
+  handle.mountpoint = malloc(strlen(root_path) + 1);
+  if (handle.mountpoint == NULL) {
+    perror("Malloc failed");
+    return -1;
+  }
+
+  strcpy(handle.mountpoint, root_path);
+
   int root_fd = open(root_path, O_PATH);
 
   if (root_fd == -1) {
@@ -43,6 +51,32 @@ int source_init(const char *root_path) {
   return 0;
 }
 
+void source_destroy(void) { free(handle.mountpoint); }
+
+const char *get_mountpoint(void) { return handle.mountpoint; }
+
+const char *real_filename(const char *filename) {
+  const char *mountpoint = get_mountpoint();
+  // Calculate required length
+  size_t len1 = strlen(mountpoint);
+  size_t len2 = strlen(filename);
+  size_t total_len = len1 + len2;
+
+  // Allocate memory (+1 for null terminator)
+  char *result = malloc(total_len + 1);
+  if (result == NULL) {
+    fprintf(stderr, "Memory allocation failed");
+    perror("");
+    return NULL;
+  }
+
+  // Copy strings
+  strcpy(result, mountpoint);
+  strcat(result, filename);
+
+  return result;
+}
+
 int source_mkdir(const char *filename, mode_t mode) {
   const char *relative_filename = source_filename_translate(filename);
   return mkdirat(handle.root_fd, relative_filename, mode);

src/sourcefs.h

@@ -19,6 +19,7 @@
  * @return 0 on success, -1 on failure.
  */
 int source_init(const char *root_path);
+void source_destroy(void);
 
 /* All of the functions below are designed to behave exactly as their non-source
  * counterparts. */

src/temp_permissions_table.c

@@ -7,6 +7,7 @@
 */
 
 #include "temp_permissions_table.h"
+#include "access_t.h"
 #include "cc.h"
 #include "process_info.h"
 #include <pthread.h>
@@ -18,6 +19,7 @@ struct temp_process_permissions {
   // proc_pid_stat(5))
   unsigned long long creation_time;
   vec(char *) allowed_files;
+  vec(char *) denied_files;
 };
 
 map(pid_t, struct temp_process_permissions) temp_permissions_table;
@@ -33,8 +35,8 @@ pthread_mutex_t temp_permissions_table_lock;
  * never really equal to 0, it exceptionally unlikely.
  */
 unsigned long long get_process_creation_time(pid_t pid) {
-  char path[32];
-  FILE *fp;
+  char path[256];
+  FILE *fp = NULL;
   unsigned long long creation_time = 0;
 
   // Construct the path to the process's status file
@@ -72,7 +74,7 @@ unsigned long long get_process_creation_time(pid_t pid) {
  *
  * @return: 0 on success, -1 on failure (e.g. ENOMEM)
  */
-int init_temp_permissions_table() {
+int init_temp_permissions_table(void) {
   pthread_mutex_init(&temp_permissions_table_lock, PTHREAD_MUTEX_DEFAULT);
   init(&temp_permissions_table);
   return 0;
@@ -81,14 +83,21 @@ int init_temp_permissions_table() {
 /**
  * Destroys the temporary permissions table.
  *
- * @note: the table is guranteed to be destroyed if it is already initialized
+ * @note: the table is guranteed to be destroyed if it is already initialized.
+ * It does not indicate any errors whatsoever. If something goes wrong - you are
+ * screwed.
  */
-void destroy_temp_permissions_table() {
+void destroy_temp_permissions_table(void) {
   // free the memory allocated for the table
   for_each(&temp_permissions_table, entry) {
     for_each(&entry->allowed_files, allowed_file) { free(*allowed_file); }
     cleanup(&entry->allowed_files);
   }
+  for_each(&temp_permissions_table, entry) {
+    for_each(&entry->denied_files, denied_file) { free(*denied_file); }
+    cleanup(&entry->denied_files);
+  }
+
   cleanup(&temp_permissions_table);
   pthread_mutex_destroy(&temp_permissions_table_lock);
 }
@@ -98,10 +107,10 @@ void destroy_temp_permissions_table() {
  *
  * @param filename: The file that the process is trying to access
  * @pram pid: PID of the process
- * @return: 0 if access is denied, 1 if access is allowed
+ * @return: access status - ALLOW, DENY or NDEF in case if no information was
+ * found is avaliable
  */
-
-int check_temp_access_noparent(const char *filename, pid_t pid) {
+access_t check_temp_access_noparent(const char *filename, pid_t pid) {
   // TODO: more efficient locking
   pthread_mutex_lock(&temp_permissions_table_lock);
   struct temp_process_permissions *permission_entry =
@@ -111,22 +120,28 @@ int check_temp_access_noparent(const char *filename, pid_t pid) {
     if (process_creation_time == 0) {
       perror("Could not retrieve process creation time");
       pthread_mutex_unlock(&temp_permissions_table_lock);
-      return 0;
+      return NDEF;
     }
 
     if (process_creation_time == permission_entry->creation_time) {
       // the process is the same as the one that was granted temporary access
       // to the file
+      for_each(&permission_entry->denied_files, denied_file) {
+        if (strncmp(*denied_file, filename, strlen(filename)) == 0) {
+          pthread_mutex_unlock(&temp_permissions_table_lock);
+          return DENY;
+        }
+      }
       for_each(&permission_entry->allowed_files, allowed_file) {
         if (strncmp(*allowed_file, filename, strlen(filename)) == 0) {
           pthread_mutex_unlock(&temp_permissions_table_lock);
-          return 1;
+          return ALLOW;
         }
       }
     }
   }
   pthread_mutex_unlock(&temp_permissions_table_lock);
-  return 0;
+  return NDEF;
 }
 
 /**
@@ -165,31 +180,36 @@ pid_t get_parent_pid(pid_t pid) {
  *
  * @param filename: The file that the process is trying to access
  * @pram pi: The process information
- * @return: 0 if access is denied, 1 if access is allowed
+ * @return: access status - ALLOW, DENY or NDEF in case if no information was
+ * found. Does not return ALLOW_TEMP.
  * @note: In case one of the parent processes is killed while this function
  * execution the result is not guranteed to be correct. It should only lead to
  * false negatives, though.
  */
-int check_temp_access(const char *filename, struct process_info pi) {
+access_t check_temp_access(const char *filename, struct process_info pi) {
   pid_t current_pid = pi.PID;
   while (current_pid != 0) {
-    if (check_temp_access_noparent(filename, current_pid)) {
-      return 1;
+    access_t access = check_temp_access_noparent(filename, current_pid);
+    if (access != NDEF) {
+      return access;
     }
     current_pid = get_parent_pid(current_pid);
   }
 
-  return 0;
+  return NDEF;
 }
 
 /**
- * Gives temporary access to the process to the file.
+ * Sets temporary access mode of the process to the file.
  *
  * @param filename: The file that the process is trying to access
  * @param pi: The process information
- * @return: 0 on success, -1 on failure (e.g. ENOMEM)
+ * @param mode: Kind of access rule to be set - SET_DENY to deny access, and
+ * SET_ALLOW to allow access.
+ * @return: 0 on success, -1 on failure.
  */
-int give_temp_access(const char *filename, struct process_info pi) {
+int set_temp_access(const char *filename, struct process_info pi,
+                    set_mode_t mode) {
   pthread_mutex_lock(&temp_permissions_table_lock);
   struct temp_process_permissions *permission_entry =
       get(&temp_permissions_table, pi.PID);
@@ -207,7 +227,13 @@ int give_temp_access(const char *filename, struct process_info pi) {
     if (process_creation_time == permission_entry->creation_time) {
       // the process is the same as the one that was granted temporary access
       // to the file
-      push(&permission_entry->allowed_files, strdup(filename));
+      if (mode == SET_ALLOW) {
+        push(&permission_entry->allowed_files, strdup(filename));
+      }
+      if (mode == SET_DENY) {
+        push(&permission_entry->denied_files, strdup(filename));
+      }
+
       pthread_mutex_unlock(&temp_permissions_table_lock);
       return 0;
     }
@@ -223,7 +249,13 @@ int give_temp_access(const char *filename, struct process_info pi) {
 
   new_permission_entry.creation_time = get_process_creation_time(pi.PID);
   init(&new_permission_entry.allowed_files);
-  push(&new_permission_entry.allowed_files, strdup(filename));
+  init(&new_permission_entry.denied_files);
+  if (mode == SET_ALLOW) {
+    push(&new_permission_entry.allowed_files, strdup(filename));
+  }
+  if (mode == SET_DENY) {
+    push(&new_permission_entry.denied_files, strdup(filename));
+  }
 
   insert(&temp_permissions_table, pi.PID, new_permission_entry);
 

src/temp_permissions_table.h

@@ -2,6 +2,7 @@
 #ifndef TEMP_PERMISSIONS_TABLE_H
 #define TEMP_PERMISSIONS_TABLE_H
 
+#include "access_t.h"
 #include "process_info.h"
 
 /**
@@ -9,31 +10,43 @@
  *
  * @return: 0 on success, -1 on failure (e.g. ENOMEM)
  */
-int init_temp_permissions_table();
+int init_temp_permissions_table(void);
 
 /**
  * Destroys the temporary permissions table.
  *
- * @note: the table is guranteed to be destroyed if it is already initialized
+ * @note: the table is guranteed to be destroyed if it is already initialized.
+ * It does not indicate any errors whatsoever. If something goes wrong - you are
+ * screwed.
  */
-void destroy_temp_permissions_table();
+void destroy_temp_permissions_table(void);
 
 /**
- * Checks if the process has a temporary access to the file.
+ * Checks if the process or any of it's parents have temporary access to the
+ * file.
+ *
+ * @param filename: The file that the process is trying to access
+ * @pram pi: The process information
+ * @return: access status - ALLOW, DENY or NDEF in case if no information was
+ * found. Does not return ALLOW_TEMP.
+ * @note: In case one of the parent processes is killed while this function
+ * execution the result is not guranteed to be correct. It should only lead to
+ * false negatives, though.
+ */
+access_t check_temp_access(const char *filename, struct process_info pi);
+
+typedef enum { SET_DENY, SET_ALLOW } set_mode_t;
+
+/**
+ * Sets temporary access mode of the process to the file.
  *
  * @param filename: The file that the process is trying to access
  * @param pi: The process information
- * @return: 0 if access is denied, 1 if access is allowed
+ * @param mode: Kind of access rule to be set - SET_DENY to deny access, and
+ * SET_ALLOW to allow access.
+ * @return: 0 on success, -1 on failure.
  */
-int check_temp_access(const char *filename, struct process_info pi);
-
-/**
- * Gives temporary access to the process to the file.
- *
- * @param filename: The file that the process is trying to access
- * @param pi: The process information
- * @return: 0 on success, -1 on failure (e.g. ENOMEM)
- */
-int give_temp_access(const char *filename, struct process_info pi);
+int set_temp_access(const char *filename, struct process_info pi,
+                    set_mode_t mode);
 
 #endif // !TEMP_PERMISSIONS_TABLE_H

src/ui-socket.c

@@ -6,11 +6,13 @@
   See the file LICENSE.
 */
 
+#include "access_t.h"
 #include <stddef.h>
 #include <sys/types.h>
 #include <time.h>
 #define _GNU_SOURCE
 #include "perm_permissions_table.h"
+#include "real_filename.h"
 #include "temp_permissions_table.h"
 #include "ui-socket.h"
 #include <pthread.h>
@@ -58,19 +60,28 @@ void destroy_ui_socket(void) {
  *
  * @param filename: The file that the process is trying to access
  * @param pi: The process information
- * @return: 0 if access is denied, 1 if access is allowed, 2 if access is
+ * @return: access status - ALLOW, DENY or ALLOW_TEMP
  * allowed for the runtime of the process
  */
-int ask_access(const char *filename, struct process_info proc_info) {
+access_t ask_access(const char *filename, struct process_info proc_info) {
   FILE *fp = NULL;
-  size_t command_len =
-      139 + sizeof(pid_t) * 8 + strlen(proc_info.name) + strlen(filename);
-  char *command = (char *)malloc(command_len);
-  snprintf(command, command_len,
-           "zenity --question --extra-button \"Allow this time\" --title "
-           "\"Allow Access?\" --text \"Allow process "
-           "<tt>%s</tt> with PID <tt>%d</tt> to access <tt>%s</tt>\"",
-           proc_info.name, proc_info.PID, filename);
+  char *command = NULL;
+  int ret =
+      asprintf(&command,
+               "zenity --question --extra-button \"Allow this time\" --title "
+               "\"Allow Access?\" --text \"Allow process "
+               "<tt>%s</tt> with PID <tt>%d</tt> to access <tt>%s</tt>\"",
+               proc_info.name, proc_info.PID, filename, get_mountpoint());
+
+  if (ret < 0) {
+    // If asprintf fails, the contents of command are undefined (see man
+    // asprintf). That does not explicitly rule out that command will be a valid
+    // pointer. But the risk of freeing a non-allocated pointer is too much to
+    // justify preparing for this.
+    fprintf(stderr, "Could not create query on rule insertion");
+    perror("");
+    return 1;
+  }
 
   // Zenity Question Message Popup
   fp = popen(command, "r");
@@ -78,7 +89,7 @@ int ask_access(const char *filename, struct process_info proc_info) {
 
   if (fp == NULL) {
     perror("Pipe returned a error");
-    return -1;
+    return DENY;
   }
 
   // if the user clicks the "Allow this time" button, `zenity` will only
@@ -89,7 +100,7 @@ int ask_access(const char *filename, struct process_info proc_info) {
     printf("%s", buffer);
     if (strcmp(buffer, ZENITY_TEMP_ALLOW_MESSAGE) == 0) {
       pclose(fp);
-      return 2;
+      return ALLOW_TEMP;
     }
   }
 
@@ -97,10 +108,10 @@ int ask_access(const char *filename, struct process_info proc_info) {
   fprintf(stderr, "zenity returned %d\n", zenity_exit_code);
   // zenity returns 1 on "No" >:(
   if (zenity_exit_code == 0) {
-    return 1;
+    return ALLOW;
   }
 
-  return 0;
+  return DENY;
 }
 
 /**
@@ -116,38 +127,62 @@ int ask_access(const char *filename, struct process_info proc_info) {
  */
 int interactive_access(const char *filename, struct process_info proc_info,
                        int opts) {
+  char *real_path = real_filename(filename);
 
-  if (check_temp_access(filename, proc_info) ||
-      check_perm_access(filename, proc_info)) {
-    // access was already granted before
+  access_t access = check_temp_access(real_path, proc_info);
+  if (access == ALLOW) {
+    free(real_path);
     return 1;
   }
+  if (access == DENY) {
+    free(real_path);
+    return 0;
+  }
+
+  access = check_perm_access(real_path, proc_info);
+  if (access == ALLOW) {
+    free(real_path);
+    return 1;
+  }
+  if (access == DENY) {
+    free(real_path);
+    return 0;
+  }
 
   // if noth GRANT_TEMP and GRANT_PERM are selected, then only permanent
   // permissions are granted
 
   if (opts & GRANT_PERM) {
-    give_perm_access(filename, proc_info);
+    give_perm_access(real_path, proc_info);
+    free(real_path);
     return 1;
   }
   if (opts & GRANT_TEMP) {
-    give_temp_access(filename, proc_info);
+    set_temp_access(real_path, proc_info, SET_ALLOW);
+    free(real_path);
     return 1;
   }
 
-  int user_response = ask_access(filename, proc_info);
-  if (user_response == 1) {
-    // user said "yes"
-    give_perm_access(filename, proc_info);
+  access_t user_response = ask_access(real_path, proc_info);
+  if (user_response == ALLOW) {
+    give_perm_access(real_path, proc_info);
+    free(real_path);
     return 1;
   }
 
-  if (user_response == 2) {
-    // user said "yes, but only this time"
-    give_temp_access(filename, proc_info);
+  if (user_response == ALLOW_TEMP) {
+    set_temp_access(real_path, proc_info, SET_ALLOW);
+    free(real_path);
     return 1;
   }
 
-  // otherwise "no"
+  if (user_response == DENY) {
+    set_temp_access(real_path, proc_info, SET_DENY);
+    free(real_path);
+    return 0;
+  }
+
+  free(real_path);
+  // deny on unknown options.
   return 0;
 }