private void frmAuthUser_Load(object sender, System.EventArgs e)
{
this.Show();
this.txtEmail.Focus();
this.txtMachineCode.Text = CConfig.GetHardKey();
}
internal static bool VerifyLocalKeyfile(string filename, out AuthInfo authinfo)
{
StreamReader reader = null;
string data = "";
authinfo = null;
try {
reader = new StreamReader(filename);
data = reader.ReadToEnd();
reader.Close();
} catch (Exception exc) {
MessageBox.Show("Offline key authorization failure: Could not read keyfile.\n\n\n" + exc.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return(false);
}
Regex rx = new Regex(@"\s*Keyfile(\n*|\s*)?" +
@"(?<inner>" +
@"(?>" +
@"\{(?<LEVEL>)" +
@"|" +
@"\};(?<-LEVEL>)" +
@"|" +
@"(?!\{|\};)." +
@")+" +
@"(?(LEVEL)(?!))" +
@")"
, RegexOptions.IgnoreCase | RegexOptions.Singleline);
Match topmatch = rx.Match(data);
if (!topmatch.Success)
{
MessageBox.Show("Offline key authorization failure: Could not find valid 'keyfile' block.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return(false);
}
string keyfile_data = topmatch.Groups["inner"].Value;
// Once we have the top matched group, parse each line in it
rx = new Regex(@"\s*\b(?<name>[A-Z]*)\b\s*=\s*((" + "\"" + @"\s*(?<single>.*?)\s*" + "\"" + @"\s*;)|(\{(?<multi>.*?)\};))", RegexOptions.Singleline | RegexOptions.IgnoreCase);
// 1 = name
// 4 = normal definition
// 6 = multiline definition
string version = "";
string name = "";
string expires = "";
string machinecode = "";
string featurebit = "";
string hash = "";
string signature = "";
string email = "";
foreach (Match m in rx.Matches(keyfile_data))
{
switch (m.Groups["name"].Value.ToLower())
{
case "version":
version = m.Groups["single"].Value;
break;
case "name":
name = m.Groups["single"].Value;
break;
case "expires":
expires = m.Groups["single"].Value;
break;
case "machinecode":
machinecode = m.Groups["single"].Value;
break;
case "featurebit":
featurebit = m.Groups["single"].Value;
break;
case "hash":
hash = m.Groups["single"].Value;
break;
case "keysignature":
signature = m.Groups["multi"].Value;
break;
case "email":
email = m.Groups["single"].Value;
break;
}
}
// Clean up signature
signature = signature.Replace(" ", "");
signature = signature.Replace("\t", "");
signature = signature.Replace("\n", "");
signature = signature.Replace("\r", "");
// Check field validity
if (version == "" || expires == "" || machinecode == "" || featurebit == "" || hash == "" || name == "" || email == "" || signature == "")
{
MessageBox.Show("Offline key authorization failure: Keyfile construction incomplete.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return(false);
}
// Check version
if (version != "1.00")
{
MessageBox.Show("Offline key authorization failure: Incorrect version (Expected '1.00')", "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return(false);
}
// Check expiration date
try {
DateTime dt = DateTime.Parse(expires);
if (DateTime.Now.Ticks >= dt.Ticks)
{
MessageBox.Show("Offline key authorization has expired. Please visit www.torquedev.com to request a new offline authorization file.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return(false);
}
} catch (Exception exc) {
MessageBox.Show("Offline key authorization failure: Unable to verify date stamp. Error returned was: " + exc.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return(false);
}
// Check if the machine codes match
if (machinecode != CConfig.GetHardKey())
{
MessageBox.Show("Offline key authorization failure: Machine code mismatch.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return(false);
}
// Verify hash of data
string sighash = CConfig.SHA1(version + name + machinecode + expires + featurebit + email);
if (sighash != hash)
{
MessageBox.Show("Offline key authorization failure: Checksum mismatch.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return(false);
}
// Verify signature by first loading the public key into memory
DSA dsa = new DSACryptoServiceProvider();
try {
dsa.FromXmlString(CVerify.PublicKey);
} catch (Exception exc) {
MessageBox.Show("Offline key authorization failure: Unable to load DSA public key. Error returned was: " + exc.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return(false);
}
// Verify the data against the signature
try {
if (!dsa.VerifySignature(Convert.FromBase64String(hash), Convert.FromBase64String(signature)))
{
MessageBox.Show("Offline key authorization failure: File signature is invalid.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
dsa.Clear();
return(false);
}
else
{
// Signature checked out. Create the passback reference
authinfo = new AuthInfo(version, name, expires, machinecode, featurebit, hash, signature, email);
return(true);
}
} catch (Exception exc) {
MessageBox.Show("Offline key authorization failure: DSA verification failure. Error returned was: " + exc.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
dsa.Clear();
return(false);
}
}