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grd-rdp-sam.c

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+/*
+ * Copyright (C) 2020 Pascal Nowack
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#include "config.h"
+
+#include "grd-rdp-sam.h"
+
+#include <fcntl.h>
+#include <gio/gio.h>
+#include <glib/gstdio.h>
+#include <stdint.h>
+#include <sys/stat.h>
+#include <winpr/ntlm.h>
+
+void
+grd_rdp_sam_free_sam_file (GrdRdpSAMFile *rdp_sam_file)
+{
+  if (rdp_sam_file->fd >= 0)
+    {
+      unlink (rdp_sam_file->filename);
+      close (rdp_sam_file->fd);
+    }
+
+  g_free (rdp_sam_file->filename);
+  g_free (rdp_sam_file);
+}
+
+static char *
+create_sam_string (const char *username,
+                   const char *password)
+{
+  uint32_t username_length;
+  uint32_t password_length;
+  uint32_t i;
+  char *sam_string;
+  uint8_t nt_hash[16];
+
+  username_length = strlen (username);
+  password_length = strlen (password);
+
+  sam_string = g_malloc0 ((username_length + 3 + 32 + 3 + 1 + 1) * sizeof (char));
+
+  NTOWFv1A ((LPSTR) password, password_length, nt_hash);
+
+  sprintf (sam_string, "%s:::", username);
+  for (i = 0; i < 16; ++i)
+    sprintf (sam_string + strlen (sam_string), "%02" PRIx8 "", nt_hash[i]);
+  sprintf (sam_string + strlen (sam_string), ":::\n");
+
+  return sam_string;
+}
+
+GrdRdpSAMFile *
+grd_rdp_sam_create_sam_file (const char *username,
+                             const char *password)
+{
+  const char *grd_path = "/gnome-remote-desktop";
+  const char *template = "/rdp-sam-XXXXXX";
+  int duped_fd;
+  GrdRdpSAMFile *rdp_sam_file;
+  g_autofree char *file_dir = NULL;
+  g_autofree char *filename = NULL;
+  g_autofree char *sam_string = NULL;
+  g_autofd int fd = -1;
+  FILE *sam_file;
+
+  file_dir = g_strdup_printf ("%s%s", g_get_user_runtime_dir (), grd_path);
+  filename = g_strdup_printf ("%s%s%s", g_get_user_runtime_dir (), grd_path,
+                              template);
+
+  if (g_access (file_dir, F_OK) &&
+      mkdir (file_dir, 0700))
+    {
+      g_warning ("Failed to create base runtime directory for "
+                 "gnome-remote-desktop: %s", g_strerror (errno));
+      return NULL;
+    }
+
+  fd = g_mkstemp (filename);
+  if (fd < 0)
+    {
+      g_warning ("[RDP] g_mkstemp() failed: %s", g_strerror (errno));
+      return NULL;
+    }
+
+  sam_file = fdopen (fd, "w+");
+  if (!sam_file)
+    {
+      g_warning ("[RDP] Failed to open SAM database: %s", g_strerror (errno));
+      return NULL;
+    }
+
+  duped_fd = dup (fd);
+  if (duped_fd < 0)
+    {
+      fclose (sam_file);
+      g_warning ("[RDP] Failed to dup fd: %s", g_strerror (errno));
+      return NULL;
+    }
+
+  rdp_sam_file = g_new0 (GrdRdpSAMFile, 1);
+  rdp_sam_file->fd = duped_fd;
+  rdp_sam_file->filename = g_steal_pointer (&filename);
+
+  g_steal_fd (&fd);
+
+  sam_string = create_sam_string (username, password);
+
+  fputs (sam_string, sam_file);
+  fclose (sam_file);
+
+  return rdp_sam_file;
+}