Initial commit

2020-09-20 12:16:44 +00:00
parent 09a4460ddb
commit 408c005d3e
839 changed files with 190481 additions and 0 deletions
--- a/common/rfb/SSecurityVncAuth.cxx
+++ b/common/rfb/SSecurityVncAuth.cxx
@@ -0,0 +1,154 @@
+/* Copyright (C) 2002-2005 RealVNC Ltd.  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 software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+//
+// SSecurityVncAuth
+//
+// XXX not thread-safe, because d3des isn't - do we need to worry about this?
+//
+
+#include <rfb/SSecurityVncAuth.h>
+#include <rdr/RandomStream.h>
+#include <rfb/SConnection.h>
+#include <rfb/Password.h>
+#include <rfb/Configuration.h>
+#include <rfb/LogWriter.h>
+#include <rfb/util.h>
+#include <rfb/Exception.h>
+#include <string.h>
+#include <stdio.h>
+extern "C" {
+#include <rfb/d3des.h>
+}
+
+
+using namespace rfb;
+
+static LogWriter vlog("SVncAuth");
+
+StringParameter SSecurityVncAuth::vncAuthPasswdFile
+("PasswordFile", "Password file for VNC authentication", "", ConfServer);
+AliasParameter rfbauth("rfbauth", "Alias for PasswordFile",
+		       &SSecurityVncAuth::vncAuthPasswdFile, ConfServer);
+VncAuthPasswdParameter SSecurityVncAuth::vncAuthPasswd
+("Password", "Obfuscated binary encoding of the password which clients must supply to "
+ "access the server", &SSecurityVncAuth::vncAuthPasswdFile);
+
+SSecurityVncAuth::SSecurityVncAuth(void)
+  : sentChallenge(false), responsePos(0), pg(&vncAuthPasswd), accessRights(0)
+{
+}
+
+bool SSecurityVncAuth::verifyResponse(const PlainPasswd &password)
+{
+  rdr::U8 expectedResponse[vncAuthChallengeSize];
+
+  // Calculate the expected response
+  rdr::U8 key[8];
+  int pwdLen = strlen(password.buf);
+  for (int i=0; i<8; i++)
+    key[i] = i<pwdLen ? password.buf[i] : 0;
+  deskey(key, EN0);
+  for (int j = 0; j < vncAuthChallengeSize; j += 8)
+    des(challenge+j, expectedResponse+j);
+
+  // Check the actual response
+  return memcmp(response, expectedResponse, vncAuthChallengeSize) == 0;
+}
+
+bool SSecurityVncAuth::processMsg(SConnection* sc)
+{
+  rdr::InStream* is = sc->getInStream();
+  rdr::OutStream* os = sc->getOutStream();
+
+  if (!sentChallenge) {
+    rdr::RandomStream rs;
+    rs.readBytes(challenge, vncAuthChallengeSize);
+    os->writeBytes(challenge, vncAuthChallengeSize);
+    os->flush();
+    sentChallenge = true;
+    return false;
+  }
+
+  while (responsePos < vncAuthChallengeSize && is->checkNoWait(1))
+    response[responsePos++] = is->readU8();
+
+  if (responsePos < vncAuthChallengeSize) return false;
+
+  PlainPasswd passwd, passwdReadOnly;
+  pg->getVncAuthPasswd(&passwd, &passwdReadOnly);
+
+  if (!passwd.buf)
+    throw AuthFailureException("No password configured for VNC Auth");
+
+  if (verifyResponse(passwd)) {
+    accessRights = SConnection::AccessDefault;
+    return true;
+  }
+
+  if (passwdReadOnly.buf && verifyResponse(passwdReadOnly)) {
+    accessRights = SConnection::AccessView;
+    return true;
+  }
+
+  throw AuthFailureException();
+}
+
+VncAuthPasswdParameter::VncAuthPasswdParameter(const char* name,
+                                               const char* desc,
+                                               StringParameter* passwdFile_)
+: BinaryParameter(name, desc, 0, 0, ConfServer), passwdFile(passwdFile_) {
+}
+
+void VncAuthPasswdParameter::getVncAuthPasswd(PlainPasswd *password, PlainPasswd *readOnlyPassword) {
+  ObfuscatedPasswd obfuscated, obfuscatedReadOnly;
+  getData((void**)&obfuscated.buf, &obfuscated.length);
+
+  if (obfuscated.length == 0) {
+    if (passwdFile) {
+      CharArray fname(passwdFile->getData());
+      if (!fname.buf[0]) {
+        vlog.info("neither %s nor %s params set", getName(), passwdFile->getName());
+        return;
+      }
+
+      FILE* fp = fopen(fname.buf, "r");
+      if (!fp) {
+        vlog.error("opening password file '%s' failed",fname.buf);
+        return;
+      }
+
+      vlog.debug("reading password file");
+      obfuscated.buf = new char[8];
+      obfuscated.length = fread(obfuscated.buf, 1, 8, fp);
+      obfuscatedReadOnly.buf = new char[8];
+      obfuscatedReadOnly.length = fread(obfuscatedReadOnly.buf, 1, 8, fp);
+      fclose(fp);
+    } else {
+      vlog.info("%s parameter not set", getName());
+    }
+  }
+
+  try {
+    PlainPasswd plainPassword(obfuscated);
+    password->replaceBuf(plainPassword.takeBuf());
+    PlainPasswd plainPasswordReadOnly(obfuscatedReadOnly);
+    readOnlyPassword->replaceBuf(plainPasswordReadOnly.takeBuf());
+  } catch (...) {
+  }
+}
+