1 files changed, 166 insertions, 0 deletions
diff --git a/gst/librfb/vncauth.c b/gst/librfb/vncauth.c
new file mode 100644
index 00000000..19083088
--- /dev/null
+++ b/gst/librfb/vncauth.c
@@ -0,0 +1,166 @@
+/*
+ *  Copyright (C) 1999 AT&T Laboratories Cambridge.  All Rights Reserved.
+ *
+ *  This 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 software 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.
+ */
+
+/*
+ * vncauth.c - Functions for VNC password management and authentication.
+ */
+
+#include "config.h"
+#include "stdint.h"
+#include "stdio.h"
+#include "stdlib.h"
+#include "string.h"
+#include "time.h"
+#include "vncauth.h"
+#include "d3des.h"
+
+#include "sys/stat.h"
+
+
+/*
+ * We use a fixed key to store passwords, since we assume that our local
+ * file system is secure but nonetheless don't want to store passwords
+ * as plaintext.
+ */
+
+unsigned char fixedkey[8] = { 23, 82, 107, 6, 35, 78, 88, 7 };
+
+
+/*
+ * Encrypt a password and store it in a file.  Returns 0 if successful,
+ * 1 if the file could not be written.
+ */
+
+int32_t
+vncEncryptAndStorePasswd (char *passwd, char *fname)
+{
+  FILE *fp;
+  uint32_t i;
+  unsigned char encryptedPasswd[8];
+
+  if ((fp = fopen (fname, "w")) == NULL)
+    return 1;
+
+  chmod (fname, S_IRUSR | S_IWUSR);
+
+  /* pad password with nulls */
+
+  for (i = 0; i < 8; i++) {
+    if (i < strlen (passwd)) {
+      encryptedPasswd[i] = passwd[i];
+    } else {
+      encryptedPasswd[i] = 0;
+    }
+  }
+
+  /* Do encryption in-place - this way we overwrite our copy of the plaintext
+     password */
+
+  deskey (fixedkey, EN0);
+  des (encryptedPasswd, encryptedPasswd);
+
+  for (i = 0; i < 8; i++) {
+    putc (encryptedPasswd[i], fp);
+  }
+
+  fclose (fp);
+  return 0;
+}
+
+
+/*
+ * Decrypt a password from a file.  Returns a pointer to a newly allocated
+ * string containing the password or a null pointer if the password could
+ * not be retrieved for some reason.
+ */
+
+char *
+vncDecryptPasswdFromFile (char *fname)
+{
+  FILE *fp;
+  int32_t i, ch;
+  unsigned char *passwd = (unsigned char *) malloc (9);
+
+  if ((fp = fopen (fname, "r")) == NULL)
+    return NULL;
+
+  for (i = 0; i < 8; i++) {
+    ch = getc (fp);
+    if (ch == EOF) {
+      fclose (fp);
+      return NULL;
+    }
+    passwd[i] = ch;
+  }
+
+  fclose (fp);
+
+  deskey (fixedkey, DE1);
+  des (passwd, passwd);
+
+  passwd[8] = 0;
+
+  return (char *) passwd;
+}
+
+
+/*
+ * Generate CHALLENGESIZE random bytes for use in challenge-response
+ * authentication.
+ */
+
+void
+vncRandomBytes (unsigned char *bytes)
+{
+  int32_t i;
+  uint32_t seed = (uint32_t) time (0);
+
+  srandom (seed);
+  for (i = 0; i < CHALLENGESIZE; i++) {
+    bytes[i] = (unsigned char) (random () & 255);
+  }
+}
+
+
+/*
+ * Encrypt CHALLENGESIZE bytes in memory using a password.
+ */
+
+void
+vncEncryptBytes (unsigned char *bytes, char *passwd)
+{
+  unsigned char key[8];
+  uint32_t i;
+
+  /* key is simply password padded with nulls */
+
+  for (i = 0; i < 8; i++) {
+    if (i < strlen (passwd)) {
+      key[i] = passwd[i];
+    } else {
+      key[i] = 0;
+    }
+  }
+
+  deskey (key, EN0);
+
+  for (i = 0; i < CHALLENGESIZE; i += 8) {
+    des (bytes + i, bytes + i);
+  }
+}